IEEE 802.11無線區域網路品質服務分析
QoS Analysis of Enhanced Distributed Channel Access in IEEE 802.11e
Date Issued
2004
Date
2004
Author(s)
Huang, Ching-Ling
DOI
en-US
Abstract
Today, WLANs are being used in residential networks to support a wide range of applications such as remote controls, video from a security camera, delivery of video on demand, voice telephony, streaming audio, and Internet access. WLANs are also being used in community networks and as a low-cost replacement for 3G broadband services by service providers. As a result, more and more multimedia applications such as voice telephony and video streaming bring challenging quality of service requirements to WLANs. Quality of service (QoS) refers to the ability of a network to provide some consistent level of ensuring data delivery over the network with different levels for different classes of traffic. Important QoS metrics for multimedia applications are throughput, delay, and jitter. Throughput is the amount of data successfully transmitted and received in unit time. End-to-end delay is the time between the arrival of a packet and its successful delivery to the receiver. Access delay is the time between packet arrival and packet transmission by the sender. Jitter is the standard deviation or variation of delay and is an important metric for multimedia applications, such as Voice over IP (VoIP). IEEE 802.11 is currently the dominant protocol for WLANs. However, there is only limited QoS supporting mechanism in IEEE 802.11. IEEE 802.11e Medium Access Control (MAC) is an emerging supplementary standard to support QoS for IEEE 802.11. The Enhanced Distributed Channel Access (EDCA) in 802.11e is an enhanced version of legacy DCF, and provides contention-based differentiated channel access for frames with different priorities. In this thesis, the behavior of each station providing EDCA for IEEE 802.11e WLANs is analyzed, in terms of the throughput, delay, and jitter. Simulations are running in NS-2 simulator to verify this analytical model. The results show that analytical results match the simulation results very well, thus providing a good description for the EDCA of IEEE 802.11e systems.
Subjects
品質服務
無線區域網路
Wireless LAN
Quality of Service
Type
thesis
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