Feedback Reduction and Throughput Maximization for MBMS Systems
Date Issued
2014
Date
2014
Author(s)
Chang, Yu-Yun
Abstract
As the increasing demand of wireless multimedia services, the multimedia broadcast multicast service (MBMS) is an emerging technology which is adopted in various wireless communication standards to enhance multimedia data transmission. In order to provide best-effort service, all users in an MBMS system need to feed back its current channel condition to the eNodeB, so that the eNodeB can choose a proper modulation and coding scheme (MCS) for transmission. Clearly, the feadback load will increase linearly as the number of users in the MBMS system increases. As a result, the spectrum efficiency is degraded because of the accordingly increased feedback bandwidth. In this thesis, we propose a threshold-based feedback scheme based on the order statistics of users in the system. From the simulation results, a nearly constant feedback load is achieved when the proposed scheme is used, and the performance approaches the conventional feedback scheme.
Besides, in an MBMS system, all users subscribing the specific service receive multimedia data via the broadcasting channel, which makes the link adaptation (LA) for the system more difficult. In this thesis, we propose an adaptive threshold-adjustment algorithm in order to maximize the MBMS system throughput. This algorithm enhances the performance of the adaptive modulation and coding (AMC) according to the instaneous channel condition. Moreover, this low-complexity algorithm is easy to implement on the user side. From the simulation results, we show that the proposed method can effectively improve the MBMS system performance.
Subjects
多媒體群播廣播服務
回饋量縮減
速率最大化
鏈結適應技術
調變與編碼方式
吞吐量最大化
Type
thesis
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