Abstract:

This paper proposes an efficient adaptive uplink schedule algorithm for Voice over Internet Protocol(VoIP) services with Adaptive Multi-Rate(AMR) speech codec in LTE systems. In the proposed algorithm, the eNode B adapts uplink resources assignment according to the two reserved bits in the generic MAC header, which is utilized to indicate the mode transition of next frame. The performances of the proposed algorithm in terms of system capacity, throughput, delay of system are analyzed compared with traditional algorithms. Theoretical analysis and simulation results show that the average access delay increases but still meet the VoIP real-time requirements and the algorithm can support much more voice users than the conventional algorithms.

Key words: LTE system, uplink schedule algorithm, voice over IP services, adaptive multi-rate speech codec, MAC header

摘要：

提出一种基于LTE系统的VoIP服务的自适应上行调度算法，该算法采用自适应多速率语音编码器，利用传统MAC通用报头中的2个比特将语音编码的模式告知eNB，eNB根据UE的语音状态转换和语音编码速率动态分配上行链路资源。从系统容量、吞吐量和时延方面对比分析该算法和传统算法的性能。理论分析和仿真结果表明，在时延满足要求的前提下，该算法比传统算法具有更高的系统容量和吞吐量。

关键词: LTE系统, 上行调度算法, IP语音业务, 自适应多速率语音编码器, MAC报头

CLC Number: 

• TP393