An AQM based congestion control for eNB RLC in 4G/LTE network
An AQM based congestion control for eNB RLC in 4G/LTE network
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4G/LTE网络中eNB RLC基于AQM的拥塞控制
DOI：
10.1109/ccece.2016.7726792
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
T. Hasegawa
中科院分区：
文献类型：
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作者：
A. Paul;Hidehiko Kawakami;Atsuo Tachibana;T. Hasegawa
在异构移动的环境的背景下，我们分析了eNodeB（eNB）无线链路控制（RLC）缓冲区溢出问题的4G/LTE网络，并显示部署主动队列管理（AQM）策略在无线接入链路的好处。为了满足无线移动的通信的日益增长的需求，已经提出LTE作为基于全IP的网络以带来更高的峰值数据速率和更好的频谱效率。LTE系统性能优化点之一是主要在下行链路处的RLC缓冲器管理。eNB处的RLC缓冲器在用户数据被MAC调度器选择用于通过无线电接口传输之前保存用户数据。需要缓冲器管理方案来将RLC缓冲器占用保持在最小水平，而不会显著降低用户应用性能。这对于移动的网络运营商来说是一个具有挑战性的问题，必须进行彻底的调查。当业务负载低时，可用带宽未被充分利用，而当业务负载高时，端到端延迟变大。本文提出了一种最小的调整RED称为智能RED（SmRED），其中的数据包丢弃概率进行调整的流量负载的基础上，以实现最佳的端到端性能。此外，在真实的网络中从RED到SmRED的迁移由于其简单性而需要很少的工作。最后，针对延迟敏感的数据流，提出了一种基于SmRED的跨层方法，使其更具有实用性。
In the context of a heterogeneous mobile environment, we analyze the eNodeB (eNB) Radio Link Control (RLC) buffer overflow problem for the 4G/LTE network, and show the benefits of deploying Active Queue Management (AQM) strategies at wireless access links. In order to satisfy the increasing demands of wireless mobile communications, LTE has been proposed as an all-IP-based network to bring higher peak data rates and better spectral efficiency. One of the LTE system performance optimization points is the RLC buffer management mainly at the downlink. RLC buffers at the eNB hold user data before it is selected by a MAC scheduler for transmission over the radio interface. A buffer management scheme is required to keep the RLC buffer occupancy to a minimal level without a noticeable degradation in user application performance. This is a challenging issue for the mobile network operator and has to be thoroughly investigated. When the traffic load is low, the available bandwidth is underutilized and when the traffic load is high, the end-to-end delay becomes large. This paper presents a minimal adjustment to RED called Smart RED (SmRED) in which the packet dropping probability is adjusted based on the traffic load to achieve optimal end-to-end performance. Additionally, the migration from RED to SmRED in a real network needs very little work because of its simplicity. Finally, for a delay-sensitive data stream, a cross layer approach based on SmRED is proposed to make it more practical.