基于RAN缓冲区管理的端到端QoS对HSDPA终端用户多流业务的改进
End-to-End QoS Improvement of HSDPA End-User Multi-flow Traffic Using RAN Buffer Management
摘要：
高速下行分组接入（HSDPA）被引入UMTS无线接入部分，以提供更高的容量用于新的分组交换业务。因此，具有多个不同业务流的分组交换会话，例如并发的语音和数据，或者传输给同一用户的视频和数据，可能是常见的蜂窝分组数据场景。在HSDPA中，无线电接入网络（RAN）缓冲器管理方案对于支持此类会话的端到端QoS是必不可少的。因此，在本文中，我们提出了一个建议的RAN缓冲区管理方案，通过动态系统级HSDPA模拟多流会话的端到端的性能研究。该方案是一个增强的时间-空间优先级（TSP）排队策略应用到节点B MAC-hs缓冲区分配给终端用户的并发实时（RT）和非实时（NRT）流在多流会话。实验性的多流场景是一个分组语音呼叫，同时向同一个用户下载基于TCP的文件。结果表明，与所提出的增强基于TSP的RAN缓冲区管理，端到端的QoS性能增益累积到NRT流，而不损害RT流QoS的相同的最终用户会话。
英文摘要：
High Speed Downlink Packet Access (HSDPA) was introduced to UMTS radio access segment to provide higher capacity for new packet switched services. As a result, packet switched sessions with multiple diverse traffic flows such as concurrentvoice and data, or video and data being transmitted to the same user are a likely commonplace cellular packet data scenario. In HSDPA, Radio Access Network (RAN) buffer management schemes are essential to support the end-to-end QoS of such sessions. Hence in this paper we present the end-to-end performance study of a proposed RAN buffer management scheme for multi-flow sessions via dynamic system-level HSDPA simulations. The scheme is an enhancement of a Time-Space Priority (TSP)queuing strategy applied to the Node B MAC-hs buffer allocated to an end user with concurrent real-time (RT) and non-real-time (NRT) flows during a multi-flow session. The experimental multiflow scenario is a packet voice call with concurrent TCP-based file download to the same user. Results show that with the proposed enhancements to the TSP-based RAN buffer management, end-to-end QoS performance gains accrue to the NRT flow without compromising RT flow QoS of the same end user session.
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