| 1. |
- Eriksson, Magnus, et al.
(författare)
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Dynamic Radio Resource Management Schemes for Interactive Services in DVB-T and DAB
- 1999
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Ingår i: Proceedings of Radiovetenskap och kommunikation. - Karlskrona : Högskolan i Karlskrona/Ronneby. - 9163081563
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The topic of this paper is dynamic schemes for downlink packet radio resource management. The results can be applied to personal communication services in the terrestrial digital video and audio broadcasting systems (DVB-T and DAB). Dynamic single frequency networks (DSFN) are investigated, meaning that the macro diversity capability of the COFDM modulation scheme is utilised for cellular communication. The concept of PARPS (Packet and Resource Plan Scheduling) is introduced. PARPS reduces the combined problem of dynamic radio resource management, including DSFN, dynamic channel allocation, power control, link adaptation, etc, to a scheduling problem. We propose several optimised and heuristic PARPS schemes. Our results show that some of the heuristic schemes have near-optimal delay performance. We also have results indicating that the capacity of the PARPS schemes for 2D Poisson traffic can be evaluated with static analyses, i.e. without simulation of a queuing system.
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| 2. |
- Eriksson, Magnus
(författare)
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Dynamic Single Frequency Networks
- 2001
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Ingår i: IEEE Journal on Selected Areas in Communications. - New York : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8716 .- 1558-0008. ; 19:10, s. 1905-1914
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Tidskriftsartikel (refereegranskat)abstract
- Wireless asymmetric Internet access with a downlink peak bit rate of 10 to 30 Mb/s can be achieved by using the terrestrial digital video broadcasting system (DVB-T) as a supplemental downlink together with today's cellular systems. This paper is a study of dynamic radio resource management on a packet-by-packet basis for this broadband downlink. The dynamic single frequency networks (DSFN) scheme is evaluated. It exploits the macrodiversity capability of the OFDM modulation scheme. The transmitters are dynamically divided into groups of transmitters that send the same information at the same channel frequency simultaneously. The fairly shared spectrum efficiency (FSSE), in bits per second per Hertz per site, which is a combined measurement of maximum throughput and fairness, is evaluated for best-effort traffic. DSFN improves the FSSE by 100% to 370%, for a certain set of test cases, in comparison to the dynamic packet assignment (DPA) scheme, which combines packet scheduling with dynamic channel assignment (DCA).
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| 3. |
- Eriksson, Magnus
(författare)
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Evaluation of Packet-by-Packet Downlink Radio Resource Management Schemes
- 2001
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Ingår i: IEEE VTS 53rd vehicular technology conference, 2001. VTC 2001 spring, vol. 2. - New York : IEEE. - 0780367286 ; , s. 967-971
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Konferensbidrag (refereegranskat)abstract
- The OFDM based terrestrial digital video broadcasting system (DVB-T) can be utilized for asymmetric Internet access with a downlink peak bit rate of 10-20Mbps. A narrow-band cellular communications system can be used as uplink. This paper is a comparison of centralized dynamic radio resource management schemes for this downlink packet radio system. Spectrum efficiency in bit/s/Hz/transmitter, and fairly shared spectrum efficiency in bit/s/Hz/transmitter, are evaluated for a best-effort traffic snapshot model. The Dynamic Packet Assignment (DPA) algorithm performs combined packet scheduling and rapid Dynamic Channel Allocation. Even better performance is achieved by the Dynamic Single Frequency Networks (DSFN) scheme. It exploits the macro-diversity capability of OFDM modulation. The base station transmitters are dynamically divided into groups that send the same information at the same channel frequency simultaneously.
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| 4. |
- Eriksson, Magnus, et al.
(författare)
-
The Concepts of PARPS : Packet and Resource Plan Scheduling
- 1999
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Ingår i: Multiaccess, Mobility and Teletraffic for Wireless Communications (MMT '99), Venice, Italy, October 6-8, 1999.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Dynamic schemes for downlink packet radio resource management (RRM) are the topic of this paper. The concept of PARPS (Packet And Resource Plan Scheduling) is introduced. PARPS reduces the combined proble m of dynamic RRM, including statistical multiplex, dynamic channel allocation, power control, link adaptation, reuse partitioning, soft handover, admission control, etc, to a scheduling problem. PARPS makes it possible to achieve dynamic RRM individually for each data packet, without performing signal-to-interference ratio calculations for every single packet. A PARPS algorithm assigns a so-called resource plan to each timeslot, and assigns data packets to timeslots and transmitters. A resource plan is a combination of several radio parameters, e.g. transmitter power levels, coding rates and modulation schemes, for a group of centrally controlled and synchronised transmitters. We propose several optimised and heuristic PARPS algorithms. Optimised PARPS is NP hard, i.e. it is not realistic to solve in real time for a big system, but it can be used for finding an upper bound for the compound effect of several RRM techniques by means of computer simulations. The heuristic algorithms are realistic to implement in real systems. Our results show that some of the heuristic algorithms have delay performance very near an optimised algorithm, and that the capacity and coverage of a set of resource plans for 2D Poisson traffic can be evaluated with static analyses, i.e. without queuing system simulation. We apply PARPS to cellular systems based on the COFDM modulation scheme. Especially, we have personal communication services in the MEMO system in mind, where the terrestrial digital audio or video broadcasting system (DAB or DVB-T) is used as a broadband downlink, in combination with some narrowband uplink, e.g. GSM.
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