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  • 301.
    Hübinette, Daniel
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Occupancy Sensor System: For Context-aware Computing2007Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This masters thesis project, "Occupancy Sensor System", was conducted at Kungliga Tekniska Högskolan (KTH), Stockholm, Sweden, during the period 2007-04-24 – 2007-12-17. The goal of the project was to design an occupancy sensor system that determines if there exists more than one person in a defined region. The output of this system is for use in a context-aware system at the KTH Center for Wireless Systems (Wireless@KTH).

    The system is important because there is a need for specific input to context-aware systems concerning occupancy of spaces and because this thesis has focused on a problem that enables new complex and interesting services. Additionally, the specific problem of determining not only occupancy, but if this occupancy is zero, one, many has not been widely examined previously. The significance of zero occupants indicating an empty room has already been recognized as having economic and environmental value in terms of heating, ventilating, air-conditioning, and lighting. However, there has not been an effort to differentiate between a person being alone or if more than one person is present. A context-aware system might be able to use this later information to infer that a meeting is taking place in a meeting room, a class taking place in a classroom or that an individual is alone in a conference room, class room, etc. Thus enabling context-aware services to change their behavior based upon the differences in these situations.

    An occupancy sensor system prototype was designed to monitor a boundary by using a thermal detector, gumstix computer, an analog to digital converter prototype board, laptop computer, and a context broker. The testing and evaluation of the system, proved it to be sound. However, there are still further improvements and tests to be made. These improvements include: dynamic configuration of the system, communication between the different system entities, detection algorithms, and code improvements. Tests measuring accuracy of a detection algorithm and determining optimal detector placement need to be performed. The next step is to design applications that use the context information provided from the occupancy sensor system and expand the system to use multiple detectors.

  • 302.
    Ibrahim, Muhammad
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Ethernet in Steer-by-wire Applications2011Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    A Controller Area Network (CAN) is a multi-master serial data communication bus designed primarily for the automotive industry. It is reliable and cost-effective and features error detection and fault confinement capabilities. CAN has been widely used in other applications, such as onboard trains, ships, construction vehicles, and aircraft. CAN has even been applied within the industrial automation segment in a range of devices such as programmable controllers, industrial robots, digital and analog I/O modules, sensors, etc. Despite its robustness and other positive features, the CAN bus has limitations in form of limited maximum data rate and maximum bus length. Also the CAN network topology is rigidly fixed which is a severe limiting factor in some of its application cases, therefore several industrial actors are evaluating alternatives to CAN.

    Ethernet is one of the potential candidates to replace CAN. It is a widespread and well knowntechnology, easily accessible, and many off-the-shelf solutions are available. It can support extended networks and offers wide possibilities in terms of network topology thanks to active switches. It features very high bandwidth, which has increased systematically from 10 Mbps to 100 Gbps year after year, always preserving backward compatibility to the maximum possible extent.

    The purpose of this thesis project is to investigate the possibility of replacing the CAN bus with Ethernet according to the following requirements:

    • Standard off-the-shelf components and software stacks
    • No modification of the network node application software, i.e. messages formatted accordingto CAN protocols must be transferred by means of Ethernet.

    A main issue is that CAN is time deterministic; it is always possible to predict the maximum latency in a message transfer. On the other hand Ethernet is still considered unreliable for time-critical applications, although the advent of Ethernet switches has minimized this non-deterministic behavior.

    A unique approach to this issue is offered as a result of the work done by Time Critical Networks, a newly started Swedish company. Their tool makes it possible to calculate the maximum forwarding time of a frame in an Ethernet network. This tool may make it possible to validate the use of Ethernet for time-critical applications.

    CPAC Systems, a company in the Volvo group which develops and manufactures steer-by-wire systems based on the CAN technology, wishes to verify whether Ethernet could now be considered as a solution to complement or replace CAN, thus overcoming CAN’s limitations. This verification is the goal of this master thesis project.

    The work was carried out through three different phase:

    • First we performed a theoretical evaluation by modeling the Ethernet network using Time Critical Network’s tools.
    • Next we verified the results by implementing the modeled CAN/Ethernet network that was previously modeled.
    • Finally, we validated the solution by directly testing the modeled CAN/Ethernet in combination with CPAC System’s steer-by-wire technology.

    The results obtained show that Ethernet in combination with Time Critical Network’s modeling tool, when it comes to time-determinism, can be a complement and/or an alternative to the CAN bus.

  • 303.
    Ibrahim, Thabit
    KTH, Tidigare Institutioner, Teleinformatik.
    Image Watermarking for Secure Image Communication1999Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In this paper we use watermarking to embed a certain message into a digital image, We present, test, and compare four message coding algorithms. These algorithms are based on repetition coding, BCH coding, a combination of these two, and erasure-correcting coding. We consider three criteria, robustness,  number of changed pixels, and complexity, in comparing our algorithms. We will show that the way of encoding the embedded message can affect the robustness of the watermark while using the same watermarking technique.

  • 304.
    Immonen, Mia
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    SIGTRAN: Signaling over IP -- a step closer to an all-IP network2005Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The mass popularization of telecommunication services in recent years have resulted in a heavily loaded signaling network. The Signaling System number 7 (SS7) is used in fixed and wireless networks and is needed for call control and services such as caller ID, roaming, and for sending SMS. The traditional SS7 networks are expensive to lease and to expand, hence a new suite of protocols have been designed to carry signaling messages over IP. This suite contains a transport protocol called Stream Control Transmission Protocol (SCTP) and various user adaptation layer protocols such as M2PA, M2UA, M3UA, and SUA. To transport the highly loss and delay sensitive signaling messages over IP, it is mandatory that the transport protocol meets the high performance requirements of SS7. Not before the IP-solution has been tested in detail, will it replace significant parts of the national telephone network.

    In this thesis, the failover duration in the case of link failure was tested using the feature of SCTP called multi-homing. The results suggest that carrying SS7 signaling traffic over IP is possible, since the failover duration does not exceed the required limit.

  • 305.
    Irstad, Noel
    et al.
    KTH, Skolan för teknik och hälsa (STH), Medicinsk teknik, Data- och elektroteknik.
    Fredrik, Stjerne
    KTH, Skolan för teknik och hälsa (STH), Medicinsk teknik, Data- och elektroteknik.
    Governing of access point for stations in an 802.11 network with a repeater to achieve higher throughput: Designing and implementing an algorithm on Inteno's OpenWRT based access points2016Independent thesis Basic level (professional degree), 10 poäng / 15 hpOppgave
    Abstract [en]

    When using a wireless repeater in a network, an overlap zone between the repeater and the primary access point that holds the internet connection is created. The theoretical throughput for connections through the repeater is reduced by half since the repeater can’t send and receive data at the same time when using only one channel which was the case in this thesis.

    To solve the problem with the overlap zone, an algorithm that runs in the form of a bash script on two openWRT-based access points where one acts as a repeater and the other one is a gateway with an internet connection was developed. The script uses the signal strength value (RSSI) to decide whether a wireless device is located within the overlap zone by comparing the measured value against a set threshold where the gateway still delivers higher throughput than the repeater. Wireless devices in the overlap zone are blocked on the repeater and will then connect to the gateway instead. Wireless devices that are located outside the overlap zone will connect to the access point that yields the strongest signal strength. The throughput to the gateway was measured at several locations with different signal strengths to both the gateway and the repeater.

    Wireless devices within the overlap zone that were connected to the repeater before the script was run gained a higher throughput after the script was run and made it connect directly to the gateway instead.

  • 306.
    Isaksson, Marcus
    KTH, Skolan för teknik och hälsa (STH), Data- och elektroteknik.
    Utvärdering av Windows RT för portning av Mario Framework2013Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Ericsson har utvecklat ett ramverk för multimediakommunikation som heter Mario. Mario kan användas för att sätta upp video- och ljud-samtal över IP och finns fungerande på Android och iOS. Mario är en del av web browsern Bowser som finns att hämta på Google Play eller App Store. Bowser möjliggör att köra WebRTC applikationer skrivna i HTML5 och JavaScript på Android och iOS.

    Nu när Microsoft släpper sina nya plattformar, Windows RT, Windows 8 och Windows Phone 8 så finns ett intresse att försöka flytta detta ramverk till dessa plattformar. Vi kommer göra ett försök att porta Mario till Windows RT. Anledningen till att Windows RT valdes är för att det är den första plattformen att släppas av de tre nämnda produkterna.

    Plattforms APIet som används i Windows RT kallar för Windows Runtime (WinRT). Många delar av det här APIet delas med Windows Phone 8 och hela WinRT APIet exponeras i Windows 8. Det här betyder att förutsatt att koden designas på rätt sätt så borde den gå att flytta mellan Windows RT, Windows 8 och Windows Phone 8 utan problem. Windows RT är ett operativsystem utvecklat för att fungera på datorer som använder ARM-baserade processorer.

    För att Mario ska kunna fungera på WinRT så måste följande mål uppfyllas:

    • De open-source bibliotek som används av Mario måste byggas på Mario.
    • C/C++ kod måste kunna köras på Windows RT plattformen.
    • Mario ramverket måste integreras med video- och ljudfångning i operativsystemet.

    Vad det gäller open-source projekt så ligger det under en sådan licens (LGPL) som gör att källkoden inte får ändras utan att hela källkoden till de projekten som använder open-source koden också släpps som open-source. Ericsson vill inte att Mario ska släppas som open-source utan vill själva ha kontroll på källkoden. Av denna anledning kommer vi utreda om det är möjligt att bygga dessa bibliotek utan att ändra i koden.

    I och med att Mario är skrivet i C och C++ så måste det också utredas hur vida det är möjligt att köra C/C++ kod i Windows RT. Vad det gäller video- och ljudfångning måste Windows RT APIet utredas för att se hur man använder det för just detta.

  • 307.
    Islam, Md. Safiqul
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    A HTTP Streaming Video Server with Dynamic Advertisement Splicing2010Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The Internet today is experiencing a large growth in the amount of traffic due to the number of users consuming streaming media. For both the operator and content providers, streaming of media generates most of its revenue through advertisements inserted in the content. One common approach is to pre-stitched (i.e. insert) advertisements into the content. Another approach is dynamic advertisement insertion, which inserts advertisements at run-time while the media is being streamed. Dynamic advertisement insertion gives operators the flexibility to insert advertisements based on context, such as the user's geographic location or the user's preferences. Developing a technique to successfully insert advertisements dynamically into the streaming media has several challenges, such as maintaining synchronization of the media, choosing the appropriate transport format for media delivery, and finding a splicing boundary that starts with a key frame. The details of these challenges are detailed in this thesis.

    We carried out extensive research to find the best transport format for delivery of media and we studied prior work in an effort to find an appropriate streaming solution to perform dynamic advertisement insertion. Based upon this research and our study of prior work we identify the best transport format for delivery of media chunks, then propose, implement, and evaluate a technique for advertisement insertion.

  • 308.
    Ismail, Ziad
    KTH, Tidigare Institutioner, Teleinformatik. KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Enhancing Usability in a Distributed System1998Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This report examines the digital information cycle (searching, viewing, and creating), and argues that the problems that are encountered should not be solved one at a time. Instead we must look at the system as a whole and redesign it.

    The report concludes that there are five areas that can enhance the usability in an information system: organize information in classes, distributed and automatic identification, separate functions from content, deal with uncertainty, and provide automatic environment management.

  • 309.
    Jacob, Kane
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik.
    Gudey, Bala Bhaskar
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik.
    Co-Design of Antenna and LNA for 1.7 - 2.7 GHz2012Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In a radio frequency (RF) system, the front-end of a radio receiver consists of an active antenna arrangement with a conducting mode antenna along with an active circuit. This arrangement helps avoid losses and SNR degradation due to the use of a coaxial cable. The active circuit is essentially an impedance matching network and a low noise amplification (LNA) stage. The input impedance of the antenna is always different from the source impedance required to be presented at the LNA input for maximum power gain and this gives rise to undesired reflections at the antenna-LNA junction. This necessitates a matching network that provides the impedance matching between the antenna and the LNA at a central frequency (CF). From the Friis formula it is seen that the total noise figure (NF) of the system is dependent on the noise figure and gain of the first stage. So, by having an LNA that provides a high gain (typically >15 dB) which inserts minimum possible noise (desirably < 1 dB), the overall noise figure of the system can be maintained low. The LNA amplifies the signal to a suitable power level that will enable the subsequent demodulation and decoding stages to efficiently recover the original signal. The antenna and the LNA can be matched with each other in two possible ways. The first approach is the traditional method followed in RF engineering where in both the antenna and LNA are matched to 50 W terminations and connected to each other. In this classical method, the antenna and LNA are matched to 50 W at the CF and does not take into account the matching at other frequencies in the operation range. The second approach employs a co-design method to match the antenna and LNA without a matching network or with minimum possible components for matching. This is accomplished by varying one or more parameters of either the antenna or LNA to control the impedances and ultimately achieve a matching over a substantial range of frequencies instead at the CF alone. The co-design method is shown to provide higher gain and a lower NF with reduced number of components, cost and size as compared to the classical method.

    The thesis work presented here is a study, design and manufacturing of an antenna-LNA module for a wide frequency range of 1.7 GHz – 2.7 GHz to explore the gain and NF improvements in the co-design approach. Planar micro strip patch antennas and GaAs E-pHEMT transistor based LNA’s are designed and the matching and co-design are simulated to test the gain and NF improvements. Furthermore, fully functional prototypes are developed with Roger R04360 substrate and the results from simulations and actual measurements are compared and discussed. 

  • 310.
    Jakobsson, Per-Johan Simon
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Cloud-Based Alerting System for IP-Telephony: A prototype development2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    An increasing number of people in Sweden are having problems with their hearing ability. The three major tools to aid hearing-impaired and deaf individuals are: hearing aids, special telephony, and alerting systems. Both hearing aids and telephony have seen a huge technical development. Hearing aids have gone from huge ponderous devices to small delicate in-ear devices. Simple text telephones have evolved into total conversation telephones with audio, video, and text all operating in real time. Although smart lamps and other alerting services not specifically made for hearing-impaired individuals do exist, the development of alerting system is unsatisfactory. The gap in technology is a huge problem and integration between modern products and alerting systems is getting harder. This thesis explores how to close this gap. The result of this thesis project is a prototype that provides the missing technological link between an alerting systems and modern smart devices. An eventual product should support all kinds of services, but the prototype is limited to solving the problem of connecting an alerting system to a modern total conversation telephones. The prototype was evaluated and based on the evaluation data a timeline was created. An overall positive response towards the product exists and the timeline had adding more third party services (such as Skype and FaceTime) as a high priority. The complete timeline as well as adding Signal Initiation Protocol support is left as future work.

  • 311.
    Janson, Robert
    et al.
    Linköpings universitet, Institutionen för systemteknik, Elektroniksystem. Linköpings universitet, Tekniska högskolan.
    Mottaghi, Amir
    Linköpings universitet, Institutionen för systemteknik, Elektroniksystem. Linköpings universitet, Tekniska högskolan.
    FPGA-design av en STDM-baserad multiplexer för seriell multiprotokollskommunikation2012Independent thesis Basic level (degree of Bachelor), 10,5 poäng / 16 hpOppgave
    Abstract [en]

    The remotely operated underwater vehicles that the client develops have needs of different kinds of data channels. In order to minimize the need of physical cable between the control unit and a ROV, a multiplex protocol has been developed. The protocol has been designed with the aim of using the bandwidth of the transferring link as efficient as possible.

    The different kinds of data channels used during this thesis project is; RS232, RS485 and CAN. ROM and FIFO-memories have been used to be able to effectively manage the different data channels. All the reading and sending of these channels have been implemented in FPGA-technology, the coding is made generic so that it will be easier to add more channels to the system in the future.

    The multiplex protocol is a modified version of the method STDM and it is a proprietary protocol. Calculations has been made in MatLab to ensure that the protocol does not exceed the maximal bandwidth that is available. The protocol utilizes the error-detecting technique CRC for the purpose of error detection.

    A PCB has been developed during this thesis project, the PCB is made so that the different data channels have connection with the FPGA circuit.

  • 312.
    Jansson, Christian
    KTH, Tidigare Institutioner, Teleinformatik.
    Making the communication network aware of the user's location1998Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This thesis report discusses and summarises the concerns for making the communication network location aware. Along with the motivation a collection of services is presented, some more useful than the others.

    Several different techniques that could be used to acquire location awareness are presented. Each presentation includes both a technical description, a section with the pros and cons, and a summary of how well it corresponds to the desired characteristics.

    At the end of the report the implementation of a prototype call routing application is described, as an example of a location aware service. It enables automatic routing of phone calls based on the user=92s location and is built with help of the Smart Badge and International Multimedia Teleconferencing Consortium (IMCT) Call Management Agent system.

  • 313.
    Jansson, Fredrik
    et al.
    KTH, Tidigare Institutioner, Teleinformatik.
    Larsson, Marcus
    KTH, Tidigare Institutioner, Teleinformatik.
    Portal Payment Possibilities: for a start-up company2000Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The corporate climate for start-up companies in Sweden has been extremely good for the last couple of years. A lot of small companies have been entering the Internet business arena in different areas such as consulting, content providing, and system developing. Especially the mobile fraction of the Internet field is today a hot topic in Scandinavia and it is rapidly spreading to the rest of the world. This Master of Science thesis investigates how a small start-up company operating in the mobile Internet field could be able to let its customers pay for the companies services.

    Different payment possibilities have been described, compared and evaluated. Amongst the possible solutions are direct Internet payment, credit cards, and micro payment systems. The evaluated solutions are mainly focused on enabling Internet based payments to take place, but the goal is to be able to conduct payments using a standard mobile device. Several technologies could be used to extend the Internet solution to the mobile market. Techniques that can be used and are evaluated in this thesis are: CTI, SMS, WAP, and SAT.

    When offering payment possibilities on the Internet an obvious problem is the security matters. Nevertheless this thesis describes and evaluates the possible solutions available today and a large factor when extending the Internet based payment method to the mobile area are the user confidence and easy to use factors. Furthermore the chosen solution should be possible for a small company to implement. That means that no hardware implementations in the mobile device are acceptable.

    Two possible solutions have been implemented and are described in the report. First a real credit card solution for the web case. Second the web solution has been extended to work in a wireless GSM environment using SMS.

  • 314.
    Jansson, Michael
    et al.
    KTH, Tidigare Institutioner, Teleinformatik.
    Eriksson, Niklas
    KTH, Tidigare Institutioner, Teleinformatik.
    Management of voice based group communication2000Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Communication between groups of people is becoming increasingly desirable as mobile telephony is merging with the existing Internet. For GSM, this is being done via GPRS, which is the first step towards the standard for 3G mobile telephony systems, UMTS. Managing groups and the members within them in order to ensure consistency, is a challenging task. The use of multicast is a great help, especially when designing a solution for WANs, where flooding should be avoided.

    This report discusses some of the aspects of group communication and group management. The report compares alternative membership algorithms and describes a solution for adding group support to Ericsson Daemon system. Also, a prototype working like a voice newsgroup is described.

  • 315.
    Jansson, Rasmus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper.
    Completion of the software required for a high-temperature DLTS setup2013Independent thesis Basic level (professional degree), 10 poäng / 15 hpOppgave
    Abstract [en]

    The main purpose of this thesis was to examine the communication problems with the DLTS set up in the Division for Electricity at Ångström Laboratory in Uppsala, Sweden, and to make the DLTS software complete. The set up consisted of a C/V meter, a pulse generator, a temperature controller and a PC with a control program written in LabVIEW. It was found that the software had been constructed to fit another set of instruments than the set up currently used at Ångström Laboratory. The task was therefore to properly integrate the correct control commands of those instruments into the software.

  • 316.
    Janzon, Henrik
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Medina Maturana, Gonzalo
    KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Utvärdering och beslutsunderlag för placering av IT-plattform: En fallstudie av Microsoft SharePoint2014Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Tillgången på så kallade molntjänster är något som har ökat de senaste åren, vilket inneburit att många klassiska tjänster nu även erbjuds i molnet. Ett beslut ifall denna typ av lösningar skall användas, påverkas av många olika aspekter som ofta är unika för den specifika organisationen. Således finns ett behov av ett underlag som tillgodoser de kriterier som är viktiga för organisationen, men också ger en överblick av de olika alternativen. Samtidigt måste även hänsyn tas till organisationens subjektiva uppfattning vid beslutsfattandet, för att på så sätt kunna genomföra ett genomtänkt och välgrundat val om vilket alternativ som bör användas. Målet med undersökningen har varit att bidra med ny information inom området och påvisa hur det praktiskt kan gå till att ta fram denna typ av underlag för att motivera sitt beslut. Detta har undersökts genom att i en fallstudie jämföra tre olika plattformsalternativ för Microsoft SharePoint och rangordna dessa efter en redan befintlig metod för att ta beslut baserade på flera kriterier. Valet av metod föll på Analytic Hierarchy Process (AHP) vilket är en etablerad metod som även används inom många andra områden och lämpar sig för beslut baserad på subjektiva uppfattningar. Undersökningen har visat att det är möjligt att använda AHP för denna typ av jämförelse, för att få en överblick mellan de olika alternativen och för att slutgiltligen få fram det alternativ som är lämpligast, vilket i detta fall blev molnlösningen.

  • 317.
    Jarrar, Asim
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Context Server support for opportunistic andadaptive mobile communication2003Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This master’s thesis extends the functionality and intelligence of the Personal Digital Assistant (PDA) when roaming in a WLAN or a GPRS network. This is accomplished by introducing a Context Server database in the new mobile IP network. The Context Server collects knowledge called Context Data, concerning the network topology, network quality at various locations, sensor data from PDAs, and network services provided at various locations and by various hosts. This distributed knowledge will enhance and extend the functionality of the PDAs by providing and facilitating more network services to the user. With the help of this Context Data the PDA will extend it’s intelligence and make routing and data transmission decisions that are more adapted to the network topology and the service that is available to the user at a specific geographical location. The PDAs will roam and access multimedia services via different wireless access networks (e.g., GPRS, WLAN, UMTS, etc.). PDAs requesting services achieve more optimal quality and utilize the best available data transmission rate by using the Context Data. Example of services that can be provided are downloading of MP3 encoded songs from a database or other PDAs, communication with other GPRS and WLAN enabled devices, streaming Internet radio, weather reports on demand, watching video clips, and Internet access. These services can be received on a laptop, mobile host, or any device with an interface to a GPRS and a WLAN network.

    Today the telecom industry is having financial problems. Everyone wants to decrease costs and achieve more functionality and offer new services with little additional investment in the existing wireless networks. This thesis should contribute to future wireless network architecture by enabling access at the appropriate cost and quality by using the available network resources more intelligently. Based upon a prototype with all the network elements involved, we are able to analyze if this idea is technically possible to implement and scaleable for use by today’s society with it’s increasing demands and desire for high quality services while they are mobile.

  • 318.
    Jaurén, Daniel
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Generic Data Structure for a Security Policy Database2008Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    IPsec makes secure Internet infrastructures more feasible, as its security services offer protection for IP traffic at the network layer. It is a very dynamic protocol suite, consisting of several protocols that enable a number of different security services. As IPsec enables flexible security, there is a need for agreements between the parties. All network nodes that utilize IPsec need to keep track of their agreements with their peer nodes, this information is stored in a Security Policy Database (SPD).

    In a network environment where thousands of pairs of nodes may communicate, it is important that lookups in the SPD occur quickly. The SPD usually operates with a small number of agreements, which suggest that the data structure it utilizes should be rather simple. However, the data structure should scale properly, even when the number of agreements increases to a very large number. This masters thesis examines existing implementations of a SPD and the existing data structures used for SPD implementation. It then tries to identify what makes a good implementation. Subsequently, a generic data structure is proposed for use as a SPD.

  • 319.
    Jernberg, Johan
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
    Metoder för att sända meddelanden från QT Systems fastighetssystem till smarta telefoner2016Independent thesis Basic level (professional degree), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Företag har länge kunnat nå ut med information till kunder via traditionella metoder så som sms och e-post. I och med den stora populariteten hos smarta telefoner och sociala medier har information nu blivit extra viktigt. Med detta har det även kommit nyare sätt för företag att kommunicera med sina kunder så som via push-notifikationer till smarta telefoner och webbläsare eller via sociala medier.

    Projektet beställdes av QT Systems och hade som syfte att ge företaget en bättre inblick i vad de har för möjligheter när det gäller att nå ut med information till deras kunder. Målet med projektet var att finna den metod som bör passa bäst för att just QT Systems fastighetssystem ska kunna notifiera deras användare om olika händelser och att kunna visa att denna går att implementera i detta system.

    Under arbetets gång bestämdes det att push-notifikationer till en native app skulle vara den bästa lösningen. Det har även gjorts ett ”proof-of-concept” som visar att den valda metoden kommer gå att implementera i QT Systems fastighetssystem och åtminstone nå ut till smarta telefoner som har Android eller iOS som operativsystem.

  • 320.
    Ji, Lin
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Increasing Accuracy of Location Determination: Exploiting Phase Change Reconstruction and Timing Measurements2007Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The thesis deals with improving location determination when using time of flight of radio signals to determine the location of a radiator. The goal of this project is to enhance an existing wireless data access point to perform an accurate measurement of the time of arrival of a data signal from a transmitter, and to combine this information with information from additional wireless data access points to determine the location of the transmitter.

    There have been a number of earlier efforts in indoor location determination system using different technologies. Many of which used signal strength analysis and they have low tolerance to moving obstacles such as humans, which frequently are the most usual dynamic obstacles in indoors. In this thesis, the proposed solution utilizes time stamping and sample correlation to utilize properties of the signal waveform, which has not previously been examined by researchers other than the examiner and advisor.

    The main contribution of the project is a detailed analysis and design of a solution, as well as a comparison with other potential solutions. The main purpose of this solution is to increase the timing accuracy to below the duration of a single symbol. The wireless device that has been analyzed implements the IEEE 802.11b protocol. Several investigations have been done to determine the best way of extracting information from the 802.11b data frame and symbol sequence; here we utilize a correlator to determine the time of arrival of a specific sequence of symbols in a data frame. The time stamping of a stream of samples has been implemented in an Altera FPGA to get a deterministic computation time.

    Instead of decoding the incoming I&Q signals and mapping them to bits, the correlator is used to detect the unique sequence containing PSK encoded and Barker code spread scrambled ones , as this sequence always appears at the start of each data frame. The advantage of this approach is that using of samples of the waveform instead of bits gives a significant enhancement in timing resolution.

    The design documents of this work include detailed descriptions, simulations, and plots. A number of simulations have been done to show the timing accuracy and standard deviation, as well as comparisons with several different approaches. Several potential optimizations have also been discussed in the report.

    Simulation code for MATLAB and implementation code for the FPGA has been included in appendices in the end of this thesis.

  • 321.
    Jiang, Zuoying
    KTH, Skolan för elektro- och systemteknik (EES), Kommunikationsnät.
    Predicting Service Metrics from Device Statistics in a Container-Based Environment2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Service assurance is critical for high-demand services running on telecom clouds. While service performance metrics may not always be available in real time to telecom operators or service providers, service performance prediction becomes an important building block for such a system. However, it is generally hard to achieve. 

    In this master thesis, we propose a machine-learning based method that enables performance prediction for services running in virtualized environments with Docker containers. This method is service agnostic and the prediction models built by this method use only device statistics collected from the server machine and from the containers hosted on it to predict the values of the service-level metrics experienced on the client side. 

    The evaluation results from the testbed, which runs a Video-on-Demand service using containerized servers, show that such a method can accurately predict different service-level metrics under various scenarios and, by applying suitable preprocessing techniques, the performance of the prediction models can be further improved. 

    In this thesis, we also show the design of a proof-of-concept of a Real-Time Analytics Engine that uses online learning methods to predict the service-level metrics in real time in a container-based environment.

  • 322.
    Jin, Shanlun
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Implementation and Analyses of the Mobile-IP Protocol: Under Windows2008Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This report is the result of a masters degree project conducted at the Department of Teleinformatics at the Royal Institute of Technology starting from the autumn 1996. The area investigated is the Mobile Internet Protocol, especially its implementation under Windows NT environment. Network driver writing under Windows NT was practised. Recent development in improving Mobile IP protocol to support micro-mobility have also been investigated.

  • 323.
    Jin, Youbei
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Integration and assessment of streaming video content and API development into a spaced repetition service2014Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    There are a lot of spaced repetition system based online learning services available nowadays, but none of them are popular or widely accepted as a good means for studying. The problem of these services is, instead of exploiting and utilizing the possibility of modern technology, they simply brought this old school learning method to the web as an application with exactly the same experience as one could have with textbooks and flash cards. This master’s thesis project concerns Sharplet, a spaced repetition system based web service, who is trying to stand out by offering some features that none of the other comparable services have. One of these features is the integration of YouTube video clips, so that in addition to text and pictures, study materials may now include both audio and video material.

    This thesis begins by reviews spaced repetition systems in general, and then focuses on some of the existing services and how to provide a better service. Next the thesis describes the design, implementation, and evaluation of a new service that includes both audio and video content. The main practical result of this master’s thesis project is a working prototype audio and video enabled spaced repetition based service. Unfortunately, the actual performance of this prototype is unacceptable, hence there is a need to improve its performance before it can be integrated with the production spaced repetition system.

  • 324.
    Joelsson, Tomas
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Mobile Web Browser Extensions: Utilizing local device functionality in mobile web applications2008Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Mobile web browsers of today have many of the same capabilities as their desktop counterparts. However, among the capabilities they lack is a way for web applications to interact with local devices. While today’s mobile phones commonly include GPS receivers and digital cameras, these local devices are currently not accessible from within the browser. The only means of utilizing these devices is by using standalone applications, but such applications lack the versatility of web browsers. If a mobile browser could utilize these local devices, then a mobile application could run within the browser, thus avoiding the need for specialized client software.

    This thesis suggests an approach for adding such capabilities to mobile browsers. In the proposed method, scripted access to local device functionality is facilitated by a local Java application. This application acts as a proxy server and allows the browser to call methods exposed by the local Java APIs. Both the benefits and some security concerns of this approach are examined. The benefits are further highlighted through two example web applications which utilize local devices.

  • 325.
    Johansson, Carl
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Kavosi, Soren
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Automating Interactions with Web Services: NFC based attendance software in Java2015Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Today we use an obsolete way of handling information regarding which student and/or teacher is attending which class/lab/seminar, attendance is written down on a piece of paper and collected so that an administrator can manually enter this information to some data processing system.

    This method is far from optimal and demands a lot of time and resources from administrators, teachers, and students. Correct gathering of attendance is important since it is required for specific parts of some courses. We propose to automate the collection of this attendance data, thus enabling students and teachers to simply swipe their NFC-enabled KTH access card in order to enter their name on an attendance list. This will be achieved by creating an application that adds a student to an attendance list by reading information using a NFC/RFID reader and mapping the card’s UID to a KTHID (a locally unique identifier used within the university) using a database. The resulting attendance list should be formatted in such a fashion that it can easily be uploaded to systems such as KTH Social and Daisy. Ideally these systems will be extended so that instructors/teachers can use this attendance list to automatically create the appropriate entries in these systems to record the student’s participation in the indicated activity – in the process avoiding a lot of manual labor and improving the accuracy of the process.

    An additional problem is that there is currently no unified system that connects the KTH access card database (BRAVIDA) to the KTH LDAP database (which stores information about KTH students, faculty, and staff). This means that each student’s access card UID must manually be added to a database together with the student’s KTHID. However, once this database entry has been made, we can then map from a card number to a KTHID (or the reverse).

    The purpose behind and expected result of this thesis is a functional prototype of an application that creates an attendance list by reading data from the student or teacher’s access cards using a NFC reader. This will hopefully stimulate further digitalization in KTH and also encourage more courses to utilize such access card based attendance lists. The result should be less manual effort by students, faculty, and staff, as well as more accurate and timely filing of attendance information for courses.

  • 326.
    Johansson Enell, Lina
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Datateknik och informatik.
    Hoffman, Emelie
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Datateknik och informatik.
    Den ständiga kampen mellan serif och sans serif: Typografins digitala utveckling2016Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Detta examensarbete är en del av utbildningen Kandidatpåbyggnad med inriktning Informatik som är ett påbyggnadsår för Grafisk design och webbutveckling på Jönköping University: School of Engineering.

    Vid en snabb granskning av hemsidor idag går det enkelt att se att det är dominerande att använda sans serif-typsnitt både till rubriker och i brödtext. I grafiska utbildningar lärs det ut att för bäst läsbarhet bör serifer användas i brödtext. Syftet med examensarbetet var att undersöka vad som påverkar läsbarheten på en digital skärm och varför det inte är vanligare att använda serifer på en webben, med tanke på hur långt tekniken kommit idag med nya högupplösta skärmar som inte borde påverka användningen av serifer. Syftet var även att undersöka om val av typografi idag alltid baseras på typografiska regler.

    Resultatet visade att ett serif-typsnitt upplevs som mer lättläst än ett sans serif-typsnitt oberoende på om de läses på en digital skärm eller på ett tryckt papper. Resultatet visade även att dominationen av sans serif-typsnitt på webben beror på en vana som hänger kvar sen förr, men att detta troligen kommer att förändras i framtiden.

    Det finns geografiska begränsningar i arbetet, då examensarbetet endast undersöker södra Sverige. För att öka validiteten kunde representanter från hela Sverige ha deltagit. Det hade kunnat påverka och förändra resultatet. Undersökningen hade kunnat förbättras generellt genom att utveckla den och använda fler typsnitt, för att få ett tydligare svar på frågeställningen den undersökte. Även detta hade kunnat påverka resultatet till något annat.

  • 327.
    Johansson Holmbäck, Fredrik
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets elektronik.
    Sundström, Max
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets elektronik.
    Undersökning av vissa beläggningars påverkan på antenners effektivitet i tågmiljö2013Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    For several years Uppsala University together with several companies has been involved in a WISENET project aimed at improving railway transport security. By placing a sensor system near the wheels of each wagon, the temperature of the bearings can be measured and transmitted to a collector placed centrally on the wagon. This in turn transmits the collected data to RFID receivers placed intermittently along the railway.

    As the signals are transmitted wirelessly, problems may occur as the antennas get dirty or coated with ice and snow. To determine the effects of these coatings, several tests were performed examining the reflection coefficient S11, the impedance Z11 and the efficiency eta of an antenna, and how they varied when various coatings were placed over the antenna. Examined coatings were ice, snow and water to determine the effects of weather, and various metal-based coatings: powdered iron both pure and partially oxidized, and iron ore granules. Finally a sample coating taken directly from a car was tested to determine how closely the other coatings resembled what appeared in normal use.

    Most of the coatings gave similar results; little or no loss of efficiency and a lowering of the resonance frequency by some 75 MHz, with both iron powder samples, the ore granules and the sample coating proved nearly identical in results. Thick layers of snow gave a noticeable drop in efficiency, as did the presence of any amount of water, which also greatly affected the resonance frequency.

  • 328.
    Johansson, Lars
    KTH, Tidigare Institutioner, Teleinformatik.
    SNMP based management for Voice Response Systems1998Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The need for management, supervision, and control of different devices connected to networks has increased. The reasons are the increased complexity of the attached devices and a desire to supervise all devices from one centralized place.

    In this project, a Voice Response System (VRS) was to be manageable by using the Simple Network Management Protocol (SNMP).

    This report is divided into three sections. The first section describes the VRS, its functionality, and how it can be used. The second section explains how the SNMP protocol and the related protocol AgentX works, and in which versions it exists. The VRS is running under Windows NT, so how SNMP works in the Windows operating system family is also described. The last section deals with the development of a manageable VRS including, which information should be manageable, which protocol and API should be used to achieve a good solution. In this last section, a prototype implementation of the management system for the VRS is described. The prototype does not cover the whole proposed solution but the implemented parts works and it can be extended easily.

  • 329.
    Johansson, Sonny
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Data- och elektroteknik.
    “Bring your own device” i svenska företag och organisationer2014Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Most companies and organizations today depend on technology connected to the Internet. Schools and offices have therefore been providing computers, phones and other technology to the employees. The recent technological development and decline in prices for technology have contributed to making these products a part of everyday life for most people. This has made it very common for employees and students to bring their own devices into school and workplaces.

    The aim of this study is to define what "Bring your own device" means for Swedish companies and organizations and how it has been implemented in those. The aim is not mainly to generalize to all Swedish companies but create an understanding how the trend is used to provide a basis for continued research in this area. The questions this thesis aims to answer is:

    1. What does the term "Bring your own device" mean in the Swedish organizations and companies in which it is implemented?
    2. How is "Bring your own device" implemented in Swedish organizations and companies?
    3. What are the policies and guidelines for the Swedish organizations and companies that have implemented "Bring your own device", and how is compliance?

    A pragmatic approach has been used to incorporate previous studies while keeping the interview questions open to new approaches. The structure has been small-N studies that go deep into a number of cases, in order to more profoundly explain a phenomenon. Mail interviews have been used to collect data from the persons responsible for "Bring your own device" in the different organisations.

    The result shows that companies see "Bring your own device" as a trend where employees bring their own devices rather than firms providing employees with devices that they use privately. Respondents have not measured or examined how the introduction of BYOD has affected productivity. It seems, like in foreign studies, to be a lack of clear policies and guidelines regarding the phenomenon.

  • 330.
    Johansson, Staffan
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Port of OPC UA to gateway for industrial networks2013Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    HMS Industrial networks is a company that offers communication solutions for automation systems. There exists an abundance of different industrial network technologies and HMS manufactures gateways that translate and allow communication between the different networks.The multiplicity of network technologies introduces problems when it comes to monitoring the processes in an automation system. It is desirable to be able to access the process data through a single network technology and this is what OPC UA is used for. Briefly, OPC UA can be described as an interface for exchange ofprocess data in automation systems. HMS has noticed a rising trend in the interest for OPC UA and therefore wants to investigate the possibility to use OPC UA on their platform, the Anybus X-Gateway. The goal of this thesis has been to port an OPC UA stack, provided by the OPCfoundation, to the HMS operating system running on an Anybus X-Gateway. The port has been successful and has been verified by unit tests and a test application. Thus, a first step towards a complete OPC UA product has been taken. Further, the thesis presents a theoretical summary about real-time operating systems to explain their function and usage.

  • 331.
    Johansson Sävenberg, David
    Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
    Fiberoptisk nätplanering2015Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Denna studierapport handlar om hur man kan gå tillväga för att bygga upp ett fiberoptiskt bredbandsnät i stadsdelen Ersliden utanför Umeå. Arbetet har styrts efter en kravspecifikationför vad nätet ska klara av.

    Rapporten innehåller två delsystem. Det ena tar upp det fasta nätets uppbyggnad och det andra tar upp vilken trådlös accesspunkt nätet ska ha.

    I studien tas det upp vilken typ av fiber nätet ska använda sig av, hur noder och kanalisationska planeras och vilken typ av hårdvara som passar nätets kravspecifikation.

  • 332.
    Johansson, Victor
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Enhancing user satisfaction in 5G networks using Network Coding2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Network data rates are growing rapidly. The data rates provided to the customers by their network providers vary from Mbps to Gbps. However, rarely do users get the promised peak throughput.

    In cellular networks, network conditions change based on obstacles, weather conditions between the client and the base stations, and even the movement of objects and people. As a result of the changes in the radio link, the data transfer rate can change rapidly, hence devices needs to adjust their communications based on the currently available data rate.

    The Transmission Control Protocol (TCP) is widely used for reliable data transfer over networks. However, TCP was initially designed when link data rates were much lower than the link data rates commonly available today. As a result, TCP does not perform well at high data rates, despite some of the changes that have been made to the protocol to support high data rate links. Moreover, TCP has problems adapting to large changes in link bandwidth (not caused by congestion), resulting in a lower average throughput than the link could potentially deliver.

    This thesis evaluates two different versions of the TCP protocol (e.g., TCP Reno and Cubic TCP) and proposes a network coding scheme to enhance users’ experience when communicating over unstable radio links. The performance of the two TCP protocols and Random Linear Network Coding (RLNC) scheme were measured in an emulated network environment. The results of these measurements were analyzed and evaluated. The analysis shows that RLNC can provide a higher throughput than TCP over a network with high packet loss. However, RLNC is a UDP based solution and does not implement congestion control algorithms or reliability. A new solution is proposed that increases reliability and implements network adaptation in RLNC solutions.

    The results obtained in this thesis can be used to develop a new protocol to increases the quality of users’ experience in high loss networks.

  • 333.
    Johari Varnoosfaderani, Mohammad
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Economical Debug Station For debugging 3G modem2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Communication world is growing with an incredible high speed. Every day comes new technologies and give us more access and opportunities in work and life.

    One of the most important branches is small cells and similar product families.

    It extends from a simple telegraph codes to 3G W-CDMA and 4G LTE networks.

    It offers mobile network operators a cost-effective alternative to macro-only deployments for meeting growing coverage and capacity demands.

    Making products and bring it to market is one part of the job. It is important that product be fault free and reliable. Due to this comes our need for test and debugging.

    Test and debugging have high value in massive production.

    This research is subjected to a small cell modem, this modem has different parts like:

    - Download link and upload link through fiber optic cables for CPRI.

    - Network part which include Wi-Fi and LAN.

    - GPS module.

    - eUSB for customization of modem firmware.

    - Com, I2C and JTAG ports for debugging or reprograming the modem.

    We need to develop a debug station to make debugging easier on this modem and having clear compare results. It is important to have a CPRI tester and GPS signal simulator in our debug station.

    Beside all of these we need to make free standalone debug station which save us money and time, and from other side it should be as accurate as possible which make it reliable.

    One of important tests which should get done on test object is Boundary scan in debug station.

    Debuggers mentioned that it is hard to stop the test process in each level and from other side it is hard to find the faults with pass/fail results.

    In this project we try to implement all necessary tests in one and same debug station.

    Debuggers use separate stations for function test and boundary scan test and eUSB programing, with help of this debug station we have all of these 3 main tests in same station and debugger can work independently to repair the boards without interfering in production process or waiting to get time to use function test station or boundary scan tester .

    One of the Results is saving time from debugger’s side and this is more effective for company to save money and give faster and better repair service.

    We should use calibrated and the most accurate tools for testing to get best result. 

  • 334.
    Johnson, Alexander
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Signaler och System.
    Extended Bluetooth Profiles on CCpilot displays2017Independent thesis Advanced level (professional degree), 20 poäng / 30 hpOppgave
    Abstract [en]

    Bluetooth is used in modern cars to connect smartphones to stream music, to access internet and for phone services such as phone book contacts and making calls. Similar features are now requested by customers of maximatecc's products, e.g. display computers, for offroad vehicles. This thesis is aimed to investigate what is needed to support these features in maximatecc's Linux based displays and how the features can be used in a Qt application.

    For instance, the connectivity features in personal cars most commonly utilizes the Bluetooth profiles:

    Advanced Audio Distribution Profile (A2DP)

    Audio/Video Remote Control Profile (AVRCP)

    Personal Area Network (PAN) Profile

    Hands Free Profile (HFP)

    Phone Book Access Profile (PBAP)

    Message Access Profile (MAP).

    In Linux operating system the Bluetooth stack Bluez is used in the lower level implementation. Open source software components recommended to implement the above profiles includes:

    Obexd (for MAP and PBAP)

    PulseAudio (for A2DP and HFP)

    oFono (for HFP)

    Connman (for PAN)

    all of which help to implement the top level profiles of the Bluetooth stack needed, easily controlled by a Qt application through DBus.

    Most of the external software components were not possible to add to the Linux image on the CCpilot VA display during the period of the thesis. Instead some features of the profiles have been tested, through a Qt demo and python test scripts, on a Virtual Machine in an environment similar to the CCpilot VA. All profiles tested had some functionality verified except for AVRCP, which is not supported until later versions of Bluez, not available for the Linux kernel on the CCpilot VA. However, the audio in the HFP only occasionally worked. On the CCpilot VA only PBAP was tested successfully.

  • 335.
    Jondring, Cecilia
    et al.
    KTH, Tidigare Institutioner, Teleinformatik.
    Stefanidis, Katerina
    KTH, Tidigare Institutioner, Teleinformatik.
    MANETv6: Mobile Ad hoc Networks with IPv62000Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Today’s Internet Protocol version 4, IPv4, has been in use since the early 1980’s and is now becoming obsolete in many ways. New networks and IP devices are constantly being attached to the Internet and the number of IP addresses is running out. The next generation Internet protocol, Internet protocol version 6 (IPv6), will allow for the continued expansion of the Internet and will replace IPv4 in the near future. Another reason for developing a new Internet protocol was to bring new functionality and higher performance into networking based on operational experience with IPv4.

    Mobile ad hoc networks are wireless, mobile networks that can be set up anywhere and anytime. Nodes in such a network can communicate beyond transmitter range by supporting multihop communication through IP routing. The network topology may change rapidly and therefore the routing functionality in an ad hoc network is different from that in an ordinary fixed IP network. Ad hoc networking can be applied in many situations, supporting applications, such as mobile conferencing outside the office. A stand-alone ad hoc network is useful in itself, but would be even more useful connected to the Internet.

    In this thesis we have investigated and analyzed how IPv6 may affect mobile ad hoc networking. Our focus has been on the IP address autoconfiguration of nodes in an ad hoc network and how the new features in IPv6 will enable a simpler way to provide Internet access to ad hoc networks. The purpose was to not use Mobile IPv6 in our solution. The solution could therefore be applied to all nodes, even to those not using Mobile IPv6. The existing solutions of how to connect an ad hoc network to the Internet are all based on Mobile IP. This fact, that our work is independent of Mobile IPv6, is a main benefit of our thesis.

  • 336.
    Jonsson, Björn
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
    Bluetooth QoS Scheduler2003Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Bluetooth is a low cost, short-range radio technology that enables electronic devices to communicate wirelessly via ad-hoc networks. Different kinds of applications may run over these networks, some of these applications with particular Quality of Service (QoS) requirements. One such application could for instance be an Audio application which need data frames to be delivered at regular interval to work properly.

    The communication over Bluetooth links is totally controlled by one of the participating nodes. Since this node controls the traffic and thereby controls the QoS within the network its communicating behaviour is of great importance for maintaining QoS reservations. A central part in maintaining QoS reservations is the scheduler, which prioritises between different tasks to be done such as which device that is allowed to transmit next.

    There is no standardised way to implement the Bluetooth scheduler. However, a Bluetooth scheduler should be able to handle QoS reservations, maintain fairness among the participating nodes, and utilise the available bandwidth efficiently. Furthermore a key requirement in Bluetooth is simplicity, therefore a Bluetooth scheduling algorithm should be of low complexity.

    This master thesis presents a new patented solution for an intra-piconet scheduling algorithm that is capable of maintaining QoS reservation, while being fair and also meet the low complexity requirement. This algorithm is presented in detail in the thesis and has been implemented in an ns2- based Bluetooth simulator. Simulations in this simulator are presented that verifies the scheduling algorithms functionality.

  • 337.
    Jonsson Fresk, Anders
    KTH, Tidigare Institutioner, Teleinformatik.
    Ethernet communication in a PC environment1995Independent thesis Advanced level (degree of Master (Two Years)), 12 poäng / 18 hpOppgave
    Abstract [en]

    The purpose of the examwork made at Ortivus Medical AB was to make a network module for the MIDA CoroNet system. This is a patient monitoring system used in the hospitals coronary care unit. The systems OS consists of DOS extended with a DOS-Extender to achive a 32-bit protected mode runtime environment. It uses also a multitasking system, AMX. A solution using packet driver was investigated. A network module was written in the C programming language. This involved using real mode and protected mode code in the same program.

  • 338.
    Jonsson, Jakob
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Processjämförelse: Byte av kommunikationsutrustning i elnätet2016Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Denna rapport behandlar olika typer av tillvägagångssätt som används vid byte utav kommunikationsutrustning. Arbetet som gjorts innefattar en jämförelse mellan två olika bytesprojekt och deras olika organisationer.

    En beskrivning utav kommunikationsenheten (Remote Terminal Unit) som används i de olika projekten görs, för att ge läsaren en uppfattning av enheten och dess funktion i det svenska elnätet.

    När läsaren bildat sig en uppfattning utav enheten så påbörjas själva organisationsjämförelsen. De två projektens olika organisationsuppbyggnader presenteras och granskas, för att sedan kunna analyseras på ett djupare plan.

    Utifrån granskning och analysering utav de två projekten så lyfts mina egna tankar och idéer fram i en diskussionsdel. Detta för att sedan, helt opartiskt kunna ta fram vad som anses vara ett optimerat tillvägagångssätt vid denna typ utav projekt.

  • 339.
    Jonsson, Jonas
    KTH, Tidigare Institutioner, Teleinformatik.
    E13 Mux: Study and prototyping1996Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Even though this thesis-project never reached the goal, a fully equipped and working prototype, it is possible to make a few important and valuable conclusions for further implementation of a prototype handling multiplexing and demultiplexing of timeslots in primary rate, E1 level and third rate, E3 level.

    This `stripped' prototype is designed to multiplex timeslots from two E1 links into one E3 link, demultiplex timeslots from one E3 link into to two E1 links, also detect and generate basic alarms such as AIS, RAI and Loss of Signal. It is equipped with one dualdirected E3 interface and a dualdirected interface for two DL-2 connections. DL-2 is an Ericsson internal format. A conversion from DL-2 to E1 is made on the board. Since there are only two actual DL-2 connections and the remaining fourteen connections simulates AIS when multiplexed and not taken care of when demultiplexed, the prototype is considered as `stripped'. The wired prototype is easily controlled from an ANSI terminal, through the V.24 interface. When prototyping is finished and the construction is installed in AXE-10 environment, the V.24 interface will be unnecessary. The reason is the command interpreter that the V.24 interface is built upon. A command interpreter is not needed in AXE-10 environment, since the multiplexer unit will be controlled by DEVCB-signals from a regional processor and not by user commands.

    The hardware is built up around the Motorola 68HC11F1. The multiplexors are very simple and are controlled by pins and not registers. This makes them easy to integrate in a system, but on the other hand it calls for higher performance of the device processor. The 68HC11F1 is not suitable for a fully equipped construction. The device processor must be able to handle alarms and produce statistics from a total of seventeen links, because the multiplexors doesn't support much more than a few alarm functions.

    The software is written with processes and signals using OS11 operative system. The software is mostly written in C. The tasks that the processes preforms are distinct and logically separated, and will not be a cause of concern when reading the programs. Redesign of one process' functionality will have no or moderate impact on other processes, since the processes communicates through well defined signals.

  • 340.
    Jonsson, Kristoffer
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper.
    Lundberg, David
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper.
    Digital Interface for Intelligent Sensors2013Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Digital Interface for Intelligent Sensors was a project whose goal was to create a digital network interface that enabled easy distribution of data from different types of digital sensors to a central computer. The purpose was to replace the already existing analogue data collection system, in order to benefit from the advantages of digital communication. This demanded a software protocol that satisfyingly would be implementable on a microcontroller. Along with software implementation the specific objective was to design, construct and build an intelligent hardware sensor device. This device was supposed to measure temperature, humidity, wind direction and wind speed by collecting information from adequate digital transducers.

    The project involved researches about bus-protocols as well as practically design and build circuits. A lot of software programming was made during the project, to get the device to work as expected. During research the Modbus-protocol was found to be the best option for our specific software needs. As for the hardware part, the core of the sensor device was based on an ATmega328 microcontroller. The ATmega328 proved to be a suitable hardware platform for implementing both the Modbus-protocol and the necessary code required to extract information from the transducers. By linking a computer to the system, working as a master, weather data from the device were able to be logged.

    The device was successfully installed on the roof at Ångströmslaboratoriet, house 2. The complete system enables other digital, Modbus implemented, devices to connect in order to communicate with the central computer. Having many devices can lead to rather complex systems. The system created in this project keeps track on all the installed devices using addresses, making a complex system easy to manage.

    The project also involved a brief collaboration with another group constructing a different digital measuring device. This device was able to connect to the system using the same Modbus-protocol and thereby communicating with the central computer.

  • 341.
    Jonsson, Lars
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, EISLAB.
    3D modeling of mineshaft using autonomous quad rotor2017Independent thesis Advanced level (professional degree), 20 poäng / 30 hpOppgave
    Abstract [en]

    In this master's thesis a multirotor with the ability to scan its surroundingswas built. To be able to produce these scans the multirotor will be equippedwith a custom built 3D LIDAR. In the future, the scans will be used togenerate a 3D map to visualize mineshafts in a well suited way for inspections.This multirotor is designed with the purpose to map mineshafts that areinaccessible to humans, due to safety reasons. To produce a 3D map of themultirotor surroundings the absolute position is needed. Since the multirotorwill be used in an environment where GPS is unavailable, the positioning issolved by utilizing an IMU and Computer Vision technology with a Rangingdevice.The functionality has been tested in a lab environment resembling real lifeoperational conditions, and conrms that it is possible to use this approachto scan an environment where it is possible to have the multirotor in line-ofsightfor the camera.The 3D scanning is relaying on a stable Wi-Fi connection and absolute positionand as long as this is established it is possible to use this point cloudfor inspection.The positioning of the multirotor is tested up to a range of 40 m, with amaximum measured accuracy of 5 cm, which is well within the range ofthe requirements of the application.

  • 342.
    Joshi, Raoul
    et al.
    Linköpings universitet, Institutionen för systemteknik, Kommunikationssystem. Linköpings universitet, Tekniska högskolan.
    Sundström, Per
    Linköpings universitet, Institutionen för systemteknik, Kommunikationssystem. Linköpings universitet, Tekniska högskolan.
    WCDMA Cell Load Control in a High-speed Train Scenario: Development of Proactive Load Control Strategies2012Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Load control design is one of the major cornerstones of radio resource management in today's UMTS networks. A WCDMA cell's ability to utilize available spectrum efficiently, maintain system stability and deliver minimum quality of service (QoS) requirements to in-cell users builds on the algorithms employed to manage the load. Admission control (AC) and congestion control (CC) are the two foremost techniques used for regulating the load, and differing environments will place varying requirements on the AC and CC schemes to optimize the QoS for the entire radio network. This thesis studies a real-life situation where cells are put under strenuous conditions, investigates the degrading effects a high-speed train has on the cell's ability to maintain acceptable levels of QoS, and proposes methods for mitigating these effects.

    The scenario is studied with regard to voice traffic where the limiting radio resource is downlink power. CC schemes that take levels of fairness into account between on-board train users and outdoor users are proposed and evaluated through simulation. Methods to anticipatorily adapt radio resource management (RRM) in a cell to prepare for a train is proposed and evaluated through simulation. A method to detect a high-speed train in a cell, and the users on it, is outlined and motivated but not simulated.

    Simulation results are promising but not conclusive. The suggested CC schemes show a surprising tendency towards an increase in congestion avoidance performance. Proactive RRM shows a significant increase in QoS for on-board users. No negative effects to users in the macro environment is noticed, with regard to the studied metrics.

  • 343.
    Juneby, Hans
    et al.
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Can, Mikael
    Högskolan i Halmstad, Akademin för informationsteknologi.
    Newtons andra vagn2015Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Ett problem för den grundläggande fysikundervisningen i skolan är att tyngdkraften ständigt stör experiment och demonstrationer, vilket gör det svårt för eleverna att förstå Newtons första och andra lag. Målet med projektet är att förbättra fysikundervisningen på högskolans bastermin. För att lösa problemet skapade vi en demonstrationsanläggning som effektivt demonstrerar inertialsystem och Newtons andra lag genom att köra ett specialkonstruerat tåg med konstant hastighet eller konstant acceleration. Eleverna har möjlighet att utföra tre olika experiment som styrs via en webbsida eller fjärrkontroll och analysera utgången genom grafer som ritas upp. Lösningen testades med mycket gott resultat. Slutsatsen är att man på ett effektivt sätt kan förbättra fysikundervisningen med hjälp av praktiska experiment som eleverna själva kan utföra.

  • 344.
    Jyde, Tomas
    KTH, Tidigare Institutioner, Teleinformatik.
    Design, Structure and Development of Transparent Redundancy for Firewalls: Using the Firewall Redundancy Protocol2000Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Due to the rapid increase of Internet users the need for secure connections between private networks and the Internet grows very fast. The solution to this security problem is the firewall. But since all traffic to external networks then has to go through the firewall, a single-point-of-failure is created. To avoid this and enable multiple cooperating parallel firewalls, the Firewall Redundancy Protocol (FRP) was specified.

    The aim of this Master Thesis was to develop a design for an implementation of FRP and propose a basis for a test specification of a future protocol implementation. The literature study has concentrated on firewalls in general and the Effnet FTC500FR firewall in particular. An analysis of other firewall redundancy solutions existing today has also been done.

    The design developed is for implementation in C, but through using an object oriented approach in the design phase an implementation in C++ should not lead to any extensive changes. The solution has 12 classes including test and simulation classes and interfaces towards the configuration system and kernel. It is possible to customize the settings with high granularity for each group of cooperating parallel firewalls, hence providing a flexible redundancy solution. Based on the work in this Master Thesis it is now possible to implement the firewall redundancy solution with FRP.

  • 345.
    Jönson, Tobias
    KTH, Tidigare Institutioner, Teleinformatik. KTH, Skolan för informations- och kommunikationsteknik (ICT).
    Presentation of News Telegrams on the World Wide Web1997Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This thesis describes how to transmit and present news telegrams on the World Wide Web using message queues. The thesis presents a possible way of doing this by describing a implementation, done by the author, on an application of the OnTheMove project which was initiated by the European Commission. The application performs a fast transmission of telegrams from a server, through a text-to-HTML encoder via a message queue to mobile radio communicating clients.

    After a description of the background and an analysis of a test done on an existing telegram presentation application, the implementation is described in detail. In addition to this, there are a discussion of text coding appropriate for news telegrams and a thorough description of the functions of message queues.

  • 346.
    Jönsson, Oscar
    Linköpings universitet, Institutionen för datavetenskap, Interaktiva och kognitiva system. Linköpings universitet, Tekniska högskolan.
    An explorative study of the technology transfer coach as a preliminary for the design of a computer aid2014Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The university technology transfer coach has an important role in supporting the commercialization of research results. This thesis has studied the technology transfer coach and their needs in the coaching process. The goal has been to investigate information needs of the technology transfer coach as a preliminary for the design of computer aids.Using a grounded theory approach, we interviewed 17 coaches working in the Swedish technology transfer environment. Extracted quotes from interviews were openly coded and categorized. The analysis show three main problem areas related to the information needs of the technology transfer coach; awareness, communication, and resources. Moreover, 20 features for future computer aids were extracted from the interview data and scenarios and personas where developed to exemplify the future use of computer aids.We conclude that there is a need for computer support in the coaching process. Such systems should aid the coach in; awareness, aiding the coach to focus on meetings; communication, aid the coach to transfer commercialisation knowledge; and resources, aid the coach in accessing and delivering of resources to the coachee. However, it is imperative that the computer aids do not interfere with the coach current process; and that the computer aid is not seen as the sole solution.

  • 347.
    Jönsson, Ulf
    et al.
    KTH, Tidigare Institutioner, Teleinformatik.
    Alriksson, Fredrik
    KTH, Tidigare Institutioner, Teleinformatik.
    MIPMANET: Mobile IP for Mobile Ad Hoc Networks1999Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Mobile ad hoc networking allows nodes to form temporary networks and communicate beyond transmitter range by supporting multihop communication through IP routing. Routing in such ten reactive, i.e., performed on-demand, as opposed to Internet routing that is proactive. As ad hoc networks are formed on a temporary basis, no assumptions are made about the IP addresses of the participating nodes; nodes may use any address. Because of these characteristics, it is not straightforward to connect an ad hoc network to the Internet. In this Master's thesis we have studied how an ad hoc network, in which on-demand routing is used and where nodes with arbitrary IP addresses may appear, can be connected to the Internet. Various ways of adapting Mobile IP to such an ad hoc network have also been explored. All this has resulted in the MIPMANET proposal.

    MIPMANET provides Internet access by using Mobile IP with foreign agent care-of addresses and reverse tunneling. By using Mobile IP, nodes are routable regardless of which network they are currently located in and by using reverse tunneling the requirements on the ad hoc routing protocol in use are kept at a minimum. Also, by using an interworking unit between the foreign agent and the ad hoc network no modifications to Mobile IP have to be made outside of the ad hoc network. MIPMANET also provides transparent interaction between Mobile IP and the ad hoc routing protocol.

    To allow analysis of the MIPMANET proposal, we have implemented it in Network Simulator 2 (ns). The Ad hoc On-demand Distance Vector (AODV) Routing protocol has been used for routing within the ad hoc network. To illustrate the effects of different design choices and to form the basis of future evaluations, we have also performed some simulations. These simulations show that the ability to choose the closest gateway to the Internet is highly valuable.

  • 348.
    Jörgensen, Eskil
    Linköpings universitet, Institutionen för systemteknik, Kommunikationssystem.
    Cell Acquisition and Synchronization for Unlicensed NB-IoT2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Narrowband Internet-of-Things (NB-IoT) is a new wireless technology designed to support cellular networks with wide coverage for a massive number of very cheap low power user devices. Studies have been initiated for deployment of NB-IoT in unlicensed frequency bands, some of which demand the use of a frequency-hopping scheme with a short channel dwell time. In order for a device to connect to a cell, it must synchronize well within the dwell time in order to decode the frequency-hopping pattern. Due to the significant path loss, the narrow bandwidth and the device characteristics, decreasing the synchronization time is a challenge. This thesis studies different methods to decrease the synchronization time for NB-IoT without increasing the demands on the user device. The study shows how artificial fast fading can be combined with denser reference signalling in order to achieve improvements to the cell acquisition and synchronization procedure sufficient for enabling unlicensed operation of NB-IoT.

  • 349.
    Kabir, Sanzida
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS, Radio Systems Laboratory (RS Lab).
    Säkerhetsstandard för ett mjukvarubaserat säkerhetselement2013Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Researchers today anticipate that in the near future, the majority of the owners of a smartphone will use it as a wallet, i.e. for contactless payment. The technology that enables contactless payment today is “Near Field Communication” (NFC), which is increasingly embedded in smartphones. Applications like mobile payment between a phone and a terminal use NFC. With Mobile payment the user’s credit and banking information gets saved and it’s extremely important for a user that the saved data doesn’t fall into the wrong hands. How should then a user of an NFC equipped device ensure that end-to-end security is strong enough when they use NFC technology? Can user feel safe enough to keep their private documents on the phone without getting “robbed”?

    NFC uses a security element “Secure Element” (SE) that offers the user safety for their mobile purchases but also in other applications such as transportation tickets. The security element comes in three forms: SD card based, SIM card based or embedded in the smartphone. Over time, the technology behind the secure element is further developed and a new phenomenon has emerged, a new type of secure element. The new technology is an application based secure element: “Software Emulation Card” (Soft-SE), which offers security without a physical SE This thesis will deal with the Secure Element’s area to see if the Soft-SE are so confident that we can count it as an option when we do our mobile purchases in the store. A number of threats and attacks that an SE or generally an NFC device can be exposed to will be mentioned and some will also be described and some possible threats and attacks against Soft-SE. In addition, a few pros and cons of applying Soft-SE will be discussed. The analysis is based on how a user can get more out of the existing SE instead of applying the Soft-SE. Based on the facts, pros and cons, and the analysis that has been treated, it has been concluded that the Soft-SE is not a more secure alternative than the SE that is already used by NFC phones. Since Soft-SE is still new, it has not yet developed to protect themselves against the possible attacks that they may be exposed to. It is strongly recommended that users of Google Wallet adhere to the Secure Element that the smartphone use instead of applying Soft-SE.

  • 350.
    Kalaglarski, Boris Iv.
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    Di Geronimo, Emilio
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Kommunikationssystem, CoS.
    IMS Interworking2007Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The goal of this project was to analyze the IP Multimedia Subsystem (IMS) with respect to the interworking functionality between two or more IMS domains belonging to different operators. The thesis presents an overview of IMS, its purpose, the circumstances and the environment in which it has evolved, and a look into some of the challenges that lie ahead. Through careful examination of the history of the mobile communications and of IMS itself, the thesis attempts to give the reader a full and comprehendible understanding of what IMS is, what its purpose is, and why it came into existence.

    The thesis considers the different models of IMS interworking, as they are currently envisioned by the standardisation bodies and the telecom industry. This analysis aims to identify some of the problematic aspects of the IMS Interworking and to suggest concrete areas for further investigation, which will contribute to the future successful IMS development and deployment.

    The report looks into such aspects of IMS interworking as the DNS, different models for ENUM DNS resolution; security issues and technical challenges of security with respect to the network as a whole and some of the IMS network elements in particular, such as the DNS. This thesis also presents the findings of the authors, regarding the challenges of interworking between networks built to support different versions of the IP protocol.

    The thesis focuses on the areas of interest, mentioned above, as these have been identified as being of particular significance in connection with the further development of the IMS architecture.

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