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Device and Service Discovery in Bluetooth Networks
Blekinge Institute of Technology, Department of Telecommunications and Signal Processing.
Blekinge Institute of Technology, Department of Telecommunications and Signal Processing.
2002 (English)Independent thesis Advanced level (degree of Master (One Year))Student thesis
Abstract [en]

In view of Bluetooth?s growing popularity a lot of research is being done to improve the performance of Bluetooth. Most of the research being performed prerequisites that a connection has already been made. Due to the frequency hopping spread spectrum used by Bluetooth the connection establishment is not as easy as it seams. Two processes have been derived to bridge the frequency discrepancies between devices, inquiry and page. In this thesis, we study the inquiry and page processes and the time it takes to complete a connection with no, one or two voice channels present at the initiating device. We have found the times to complete the processes to be lengthy at best, unreasonably long if there is voice traffic present. Through optimisation, we have decreased the mean time to connect. We propose some changes to the default values of a few time outs and variables, which yields a substantial improvement in performance, especially in the case when there is voice traffic present. The changes are in the software only, no changes in hardware are necessary. After a connection is made a client may want to start using the services of the device it is connected to. This is another topic of this thesis. Bluetooth does not provide means of accessing a service, only discovering it. Thus, there is the need for higher-level protocols for accessing services. We have investigated some of the service discovery protocols currently available.

Abstract [sv]

Med tanke på Bluetooth-teknikens växande popularitet bedrivs mycket forskning för att förbättra Bluetooth-teknikens prestanda. Den mesta delen av forskningen förutsätter att en uppkoppling redan skett. På grund av frekvenshoppningstekniken som används i Bluetooth är detta inte så lätt som det låter. För att överkomma frekvensskillnaden mellan enheter används två processer, inquiry och page. I denna uppsats studerar vi inquiry- och page-processerna och studerar tiden det tar att slutföra en uppkoppling med ingen, en eller två tal-kanaler redan uppkopplade. Vi har funnit att tiden det tar är i bästa fall lång, om det finns tal-kanaler uppkopplade är tidsåtgången oacceptabel. Genom optimering av en del variabler och time-outs har vi lyckats reducera uppkopplingstiden, speciellt i fallet med tal-kanaler redan uppkopplade. Våra föreslagna ändringar är endast i mjukvaran, inga hårdvaruändringar är nödvändiga. Efter att uppkopplingen är slutförd kommer användaren att vilja börja använda de tjänster som erbjuds. Detta är en annan del av uppsatsen. Bluetooth-tekniken tillhandahåller inte något sätt att tillgodogöra sig tjänster, bara att upptäcka dem. Därför behövs det protokoll för att lösa detta. Vi har undersökt en del av de så kallade "service discovery"-protokoll som finns tillgängliga idag

Place, publisher, year, edition, pages
2002. , 79 p.
Keyword [en]
service discovery, inquiry, page, bluetooth, connection establishment
National Category
Computer Science Telecommunications Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:bth-3621Local ID: oai:bth.se:arkivex16EEF822796B09F7C1256BDA00485F33OAI: oai:DiVA.org:bth-3621DiVA: diva2:830931
Uppsok
Technology
Supervisors
Available from: 2015-04-22 Created: 2002-06-16 Last updated: 2015-06-30Bibliographically approved

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Computer ScienceTelecommunicationsElectrical Engineering, Electronic Engineering, Information Engineering

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