-
[show abstract]
[hide abstract]
ABSTRACT: MBMS is an efficient means to provide multimedia services by sharing common radio channels among a group of users. This paper presents performance evaluation of MBMS in LTE framework by a simulator set up according to 3GPP standard. A general comparison is first made among point-topoint (p-t-p), point-to-multipoint (p-t-m) and single frequency network (SFN), which shows that p-t-m with feedback is more efficient than p-t-p, and SFN can lead to remarkable performance enhancement. We also elaborate the packet scheduling process of p-t-m with feedback scheme, which involves sector-specific adaptive modulation coding (AMC) and hybrid automatic repeat request (HARQ), and then investigate the gain provided by them. It is shown that with moderate user number, fast AMC and HARQ can give 25% and 70% throughput gain respectively. However, this gain decreases with user number.
Wireless Communications, Networking and Mobile Computing, 2009. WiCom '09. 5th International Conference on; 10/2009
-
[show abstract]
[hide abstract]
ABSTRACT: Multimedia Broadcast/Multicast Service (MBMS) provides efficient solution for multimedia broadcasting services by distributing resources among a group of subscribers. Different from previous broadcasting services, MBMS subscribers will send feedback information which can be used to improve system performance by adapting resource allocation to channel state. In this paper in LTE frameworks we propose a frequency domain packet scheduling (FDPS) algorithm for MBMS, in which resource blocks are dynamically allocated to MBMS based on knowledge of instantaneous channel condition. The objective is to optimize system throughput performance while guaranteeing system coverage. This paper examines the algorithm in details with different (channel quality indicator) CQI reporting modes, alterable frequency bandwidth for MBMS and different numbers of MBMS subscribers per sector. Simulations show that comparing to a simple blind FDPS algorithm, the proposed algorithm improves system throughput without sacrificing coverage.
Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th; 05/2009
-
[show abstract]
[hide abstract]
ABSTRACT: In radio resource management of multimedia broadcast/multicast service (MBMS), user equipment (UE) feedback can be used by evolved Node B (eNB) to improve the radio spectral efficiency. As UE feedback is costly we here suggest schemes to reduce the uplink feedback while maintaining the spectral efficiency. For the 3 schemes analyzed in this paper we utilize the special characteristic of a broadcast channel, that spectral efficiency is mainly determined by the UE with lowest channel quality. The performance of the suggested schemes are evaluated with long term evolution (LTE) system simulation and we conclude that using geometry for selecting feedback UEs is the optimal solution and 4 feedback UEs are enough to meet the coverage requirement.
Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th; 05/2009
