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Aspects of Control Signaling in Wireless Multiple Access Systems
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, The Institute of Technology.
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

From its first appearance, wireless communications has changed thelife for many people worldwide. Currently, more than half of the world's population are using wireless devices for various purposes on a daily basis. While the early wireless systems could provide simple and specific low-rate services, today's systems can support a variety of more advanced services some of which require high data rate communications. This includes for example web-browsing and streaming multimedia applications. To meet the high demands on the current systems, many technical solutions have been proposed. Many of these solutions are powerful in the sense of boosting the system performance, but on the other hand, they impose a substantial control signaling overhead on the system. The control signaling refers to sending the control information that is necessary to establish and/or maintain the connection as opposed to the payload data that is transmitted during the connection.

In this thesis, we are interested in evaluating the relations between the gain of deploying new techniques and the amount of control signaling overhead they incur. Moreover we are interested in finding efficient algorithms that can potentially reduce the control signaling overhead. More specifically, we first focus on the part of the control signaling overhead that concerns sending the scheduling assignments that describe how the channel resources are allocated among the users. We compare two ways for the signaling of scheduling assignments and we will study how different parameters such as scheduling granularity impact the control signaling overhead. We also provide two schemes that reduce the control signaling overhead substantially. We then provide an algorithm for fast blind identification of channel codes. This algorithm is very useful in improving the so-called blind decoding performance. This is essential since blind decoding is used to achieve adaptive modulation and coding in the control channel of some of the wireless communication systems such as 3GPP Long Term Evolution.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press , 2011. , 22 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1493
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-68069Local ID: LIU-TEK-LIC-2011:32ISBN: 978-91-7393-145-8OAI: oai:DiVA.org:liu-68069DiVA: diva2:416005
Presentation
2011-06-10, Planck, Fysik Huset, Campus Valla, Linköpings universitet, Linköping, 13:15 (English)
Opponent
Supervisors
Available from: 2011-05-12 Created: 2011-05-10 Last updated: 2016-08-31Bibliographically approved
List of papers
1. Comparison of Strategies for Signaling of Scheduling Assignments in Wireless OFDMA
Open this publication in new window or tab >>Comparison of Strategies for Signaling of Scheduling Assignments in Wireless OFDMA
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2010 (English)In: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 59, no 9, 4527-4542 p.Article in journal (Refereed) Published
Abstract [en]

This paper considers transmission of scheduling information in  OFDMA-based cellular communication systems such as 3GPP long-term  evolution (LTE). These systems provide efficient usage of radio  resources by allowing users to be scheduled dynamically in both  frequency and time. This requires considerable amounts of scheduling  information to be sent to the users.  The paper compares two basic transmission strategies: transmitting a  separate scheduling message to each user versus broadcasting a joint  scheduling message to all users. Different scheduling granularities  are considered, as well as different scheduling algorithms. The  schemes are evaluated in the context of the LTE downlink using  multiuser system simulations, assuming a full-buffer situation.  The results show that separate transmission of the scheduling  information requires a slightly lower overhead than joint  broadcasting, when proportional fair scheduling is employed and the  users are spread out over the cell area. The results also indicate  that the scheduling granularity standardized for LTE provides a good  trade-off between scheduling granularity and overhead.

Place, publisher, year, edition, pages
IEEE, 2010
Keyword
Control signaling, resource allocation in wireless OFDMA, signaling of scheduling assignments, signaling overhead
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-58156 (URN)10.1109/TVT.2010.2066589 (DOI)000284087700029 ()
Note
©2010 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Reza Moosavi, Jonas Eriksson, Erik G. Larsson, Niclas Wiberg, Pål Frenger and Fredrik Gunnarsson, Comparison of Strategies for Signaling of Scheduling Assignments in Wireless OFDMA, 2010, IEEE Transactions on Vehicular Technology. http://dx.doi.org/10.1109/TVT.2010.2066589 Available from: 2010-08-09 Created: 2010-08-09 Last updated: 2016-08-31
2. Reducing Physical Layer Control Signaling Using Mobile-Assisted Scheduling
Open this publication in new window or tab >>Reducing Physical Layer Control Signaling Using Mobile-Assisted Scheduling
2013 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 12, no 1, 368-379 p.Article in journal (Refereed) Published
Abstract [en]

We present a scheme for reducing the part of the downlink signaling  traffic in wireless multiple access systems that contains scheduling  information.  The theoretical basis of the scheme is that the  scheduling decisions made by the base station are correlated with  the CSI reports from the mobiles.  This correlation can be exploited  by the source coding scheme that is used to compress the scheduling  maps before they are sent to the mobiles. In the proposed scheme,  this idea is implemented by letting the mobiles make tentative  scheduling decisions themselves, and then letting the base station  transmit "agreement maps" instead of raw scheduling maps to the  mobiles.  The agreement maps have lower entropy and they require  less resources to be transmitted than the original scheduling maps  do. The improvement can be substantial.  We also model the task of  finding the optimal scheduling assignments according to the proposed  scheme as a combinatorial optimization problem and present an  efficient algorithm to find the optimal solution.

Place, publisher, year, edition, pages
IEEE, 2013
Keyword
Mobile-assisted scheduling; Control signaling; Resource allocation; Signaling overhead
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-68071 (URN)10.1109/TWC.2012.120312.120680 (DOI)000314178100035 ()
Available from: 2011-05-10 Created: 2011-05-10 Last updated: 2016-08-31
3. Differential Signaling of Scheduling Information in Wireless Multiple Access Systems
Open this publication in new window or tab >>Differential Signaling of Scheduling Information in Wireless Multiple Access Systems
2010 (English)In: Proceedings of the IEEE Global Communications Conference (GLOBECOM), 2010, 1-6 p.Conference paper (Refereed)
Abstract [en]

This paper considers the control signaling on the downlink in wireless multiple access systems, with focus on the part of the control signaling that carries information on the user's time/frequency scheduling assignments. A new idea is presented to reduce the amount of channel resources needed for this signaling. The idea is to exploit the fact that provided that only one single user is scheduled on each channel resource, then the different users' scheduling assignments are correlated. This correlation can be exploited by encoding the scheduling information differentially. In order to recover the scheduling information, a user must then decode the scheduling information of some of the others. This is possible, because on the downlink, all users can hear the transmission by the base station so that users with a high SNR may decode the control signaling sent to users with a lower SNR. We present a practical scheme to exploit this idea. Both analytical analysis and numerical examples illustrate that the proposed technique can provide a substantial reduction in signaling traffic.

Series
, Global Telecommunications Conference, ISSN 1930-529X
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-57630 (URN)10.1109/GLOCOM.2010.5683176 (DOI)978-1-4244-5637-6 (online) (ISBN)978-1-4244-5636-9 (print) (ISBN)
Conference
The IEEE Global Communications Conference (GLOBECOM), 06-10 December, Miami, FL, USA
Note
©2010 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.: Reza Moosavi, Jonas Eriksson and Erik G. Larsson, Differential Signaling of Scheduling Information in Wireless Multiple Access Systems, 2010, Proceedings of the IEEE Global Communications Conference 2010 (GLOBECOM 2010).Available from: 2010-06-24 Created: 2010-06-24 Last updated: 2016-08-31Bibliographically approved
4. A Fast Scheme for Blind Identification of Channel  Codes
Open this publication in new window or tab >>A Fast Scheme for Blind Identification of Channel  Codes
2011 (English)Conference paper (Refereed)
Abstract [en]

We present a fast mechanism for determining which channel code that was used on a communication link. In the proposed scheme, the receiver does not need to receive the entire data to determine the actual code. Moreover, the proposed scheme can also be used to determine the interleaving/scrambling sequence that was used at the transmitter. We investigate the performance of the scheme for some standard convolutional codes.

Place, publisher, year, edition, pages
IEEE, 2011
Series
, IEEE Global Communications Conference, Exhibition, & Industry Forum (GLOBECOM), ISSN 1930-529X
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-68072 (URN)10.1109/GLOCOM.2011.6133507 (DOI)978-1-4244-9267-1 (online) (ISBN)978-1-4244-9266-4 (print) (ISBN)
Conference
54th Annual IEEE Global Telecommunications Conference: "Energizing Global Communications", GLOBECOM 2011; Houston, TX; United States
Note

©2011 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Reza Moosavi and Erik G. Larsson, A Fast Scheme for Blind Identification of Channel Codes, 2011, accepted The 54th IEEE Global Communications Conference (GLOBECOM).

Available from: 2011-05-10 Created: 2011-05-10 Last updated: 2016-09-13

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