PHY/MAC Enhancements and QoS Mechanisms for Very High Throughput WLANs: A Survey
PHY/MAC Enhancements and QoS Mechanisms for Very High Throughput WLANs: A Survey
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DOI：
10.1109/surv.2013.013013.00084
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发表时间：
2013-01-01
影响因子：
35.6
通讯作者：
Kamoun, Lotfi
中科院分区：
文献类型：
--
作者：
Charfi, Emna;Chaari, Lamia;Kamoun, Lotfi
为了改进无线技术，随着 IEEE 802.11 设备的激增，无线局域网在过去几年中经历了巨大的发展。第一代高吞吐量网络 IEEE 802.11n 于 2009 年开发，达到 130 Mbps。此外，为了提高吞吐量，IEEE 802.11的两个新修订版正在开发中，即IEEE 802.11ad和IEEE 802.11ac。第一个目标是通过支持多用户访问技术达到 1Gbps。第二次修订旨在实现高达 7Gbp 的传输速率，并能够在 60GHz 频段进行传输，从而为更宽的频段信道提供机会。另一种 WLAN 已最终确定，称为 IEEE 802.11aa，其目标是为视频流提供可靠的多播传输。在本次调查中，我们研究了所有这些 WLAN 规范引入的不同 PHY 和 MAC 增强功能。我们特别关注每个修订的特点以及导致网络性能提高的主要 MAC 机制。基于所有最新的 MAC 机制都旨在提高实时多媒体应用的 QoS 保证这一事实，我们研究了为 WLAN 上的实时多媒体流传输提供 QoS 满足的不同方案和机制。也就是说，我们研究了为 WLAN 网络提出的调度机制、呼叫准入控制算法和预期的 MAC 增强，以支持满足 QoS 的实时应用。
Wireless local area networking has experienced tremendous growth in the last years with the proliferation of IEEE 802.11 devices in order to improve wireless technology. The first generation of high throughput networks known as IEEE 802.11n was developed in 2009 to reach 130 Mbps. Furthermore, to enhance the throughput, two new amendments for IEEE 802.11 are under developments which are IEEE 802.11ad and IEEE 802.11ac. The first one aims to reach 1Gbps with supporting multi-user access techniques. The second amendment aims to enable up to 7Gbp with the possibility of transmitting in the 60GHz band that provides the opportunity for much wider band channels. Another WLAN is already finalized called IEEE 802.11aa in the goal to provide a reliable multicast transport for video streaming. In this survey, we examine the dif-ferent PHY and MAC enhancements introduced by all these WLAN specifications. Particularly, we focus on the characteristics of each amendment as well as the main MAC mechanisms that lead to improve the network performance. Based on the fact that all recent MAC mechanisms aim to increase QoS guarantee for real time multimedia applications, we have studied different schemes and mechanisms that provide QoS satisfaction for real time multimedia flows transport over WLANs. Namely, we investigate the scheduling mechanisms, the call admission control algorithms, and the anticipated MAC enhancement which are proposed for WLANs networks to support real time applications with QoS satisfaction.