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Future Wireless Communication based on Multi-Radio Access
Ericsson Research, Germany.
University of Cantabria, Spain.
University of Cantabria, Spain.
University of Cantabria, Spain.
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2004 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In future we will see a multitude of wireless networking technologies deployed, based on a variety of radio access technologies (RATs) and standards. The availability of multiple access alternatives offers the capability of increasing the overall transmission capacity, providing better service quality and reducing the deployment costs for wireless access. In order to exploit this potential multi-access gain it is required that different RATs are managed in a co-operative fashion. This paper presents current research activities on different levels of co-operation between heterogeneous RATs. It introduces multi-radio access for ambient networks, which is based on the two concepts of multi-radio resource management and a generic link layer. These concepts provide a modular functionality which allows different levels of collaboration between different RATs.

Place, publisher, year, edition, pages
2004.
National Category
Computer and Information Science
Research subject
SRA - ICT
Identifiers
URN: urn:nbn:se:kth:diva-27801OAI: oai:DiVA.org:kth-27801DiVA: diva2:382595
Conference
Wireless World Research Forum Meeting
Note

QC 20110105

Available from: 2011-01-02 Created: 2011-01-02 Last updated: 2013-05-31Bibliographically approved
In thesis
1. Study of Multi-Radio Transmission Diversity in Heterogeneous Access Networks
Open this publication in new window or tab >>Study of Multi-Radio Transmission Diversity in Heterogeneous Access Networks
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

With the advent of multi-radio access (MRA), an integration of differentradio access technologies (RATs) into a heterogeneous radio access network(RAN) becomes feasible. Such integration allows a user to be at any instantof time served by one or multiple radio accesses (RAs) concurrently, where anRA constitutes an independent radio resource, such as a carrier or a channel,implemented by a single RAT. It also allows a user´s service demands to bemapped onto the aggregated network resources in a transparent and efficientway. An approach for the realization of such multi-radio integrated environmentsis through a unifying generic link layer (GLL) that provides joint radiolink processing and enables communication between nodes and devices acrossdifferent radio accesses.Based on the requirements on multi-access, an architecture that supportsMRA is suggested and the functions of GLL that aims at integrating andutilising multiple RATs are defined. We explore the potential for performanceimprovements through novel extensions of the transmission diversityparadigm which builds on GLL functions that enable multi-radio access selection.Multi-radio transmission diversity (MRTD) is defined as the dynamicselection of radio access for the transmission of a user´s data and it can bethought of as consisting of a packet scheduler operating across multiple radiointerfaces. Different MRTD schemes may be envisaged through combinationsof access re-selection rate, transmission parallelism and transmission redundancy.The re-selection rate refers to the rate at which radio access selectionis performed. It may range from multiple IP packets to one single MACframe. Switched MRTD corresponds to an access selection scheme where auser transmits via one RA at a time, while parallel MRTD corresponds to ascheme where simultaneous transmissions over multiple RAs are scheduled.Finally, redundancy refers to the transmission of copies of the same data overmultiple RAs to increase the possibility of correct reception.The benefits of MRTD are investigated by simulation studies on two multiradiocase scenarios, based on generic RATs and on specific RATs respectively.In the RAT generic scenario, switched MRTD has been evaluated for networktopologies of collocated and non-collocated RAs consisting of macroand pico-cells. In the case of collocated RAs, spectral efficiency is increasedby exploiting diversity in multi-path fading while in non-collocated RAs, thespectral efficiency increase is due to diversity exploitation in both shadowingand multi-path fading. Simulation results show that switched MRTD is mostadvantageous when the RAs provide comparable throughputs. Furthermore,when combined with multi-radio ARQ, MRTD significantly reduces packetloss and packet transmission delays. This is also shown in the specific radioaccesssimulation scenario where a delay sensitive voice service is studied. Inaddition, switched MRTD provides comparable gains to parallel MRTD interms of average packet transmission delay and packet loss, while using lessradio resources. In all cases, it is concluded that maximum performance isconditioned on the reporting delays of the channel quality indicator (CQI).Reporting delays of CQI that are half the channel coherence time render sucha complex MRTD mechanism less effective.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. viii, 84 p.
Series
Trita-EE, ISSN 1653-5146 ; 2013:027
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-122723 (URN)978-91-7501-793-8 (ISBN)
Presentation
2013-06-11, Q17, Osquldasväg 6, KTH, Stockholm, 15:00 (English)
Opponent
Supervisors
Note

QC 20130531

Available from: 2013-05-31 Created: 2013-05-28 Last updated: 2013-09-09Bibliographically approved

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Koudouridis, George

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