Performance Analysis and Algorithm Selection for Reliable Multicast in IEEE 802.11aa Wireless LAN

Abstract

Abstract-Legacy IEEE 802.11 does not efficiently support multicast transmissions. In order to cope with the increasing demand for multicast, mainly required to deliver multimedia traffic, the IEEE 802.11aa Task Group has recently standardized new mechanisms to allow efficient and robust transmission of multicast flows in Wireless LAN. However, the standard allows the use of different mechanisms for this purpose, and leaves open the choice of which one to use for a given scenario. In this paper, we present an analytical model to evaluate the performance of the mechanisms included in the 802.11aa standard and compare their performance. Our analysis shows that there is no absolute winner out of these mechanisms, and performance strongly depends on the scenario. Building on our model, we then propose a novel algorithm that selects the best multicast mechanism to use as a function of the scenario conditions. Our results are validated by extensive simulations.

Experimental QoE Evaluation of Multicast Video Delivery over IEEE 802.11aa WLANs

“…The diversity of mechanisms introduced by GATS (we summarise them in Section 2) makes the selection of the best performing configuration given a network setting a tough task: the standard, in fact, does not give any insight into the performance of each mechanism, nor provides any guideline on which mechanism to use for a given scenario. Indeed, in our previous analytical [3] and experimental [4] studies, we have confirmed that each GATS mechanism provides a different performance trade-off in terms of complexity, efficiency and effectiveness, and therefore the "optimal" scheme depends on the parameters of the scenario. One key limitation of these studies, though, is that the performance evaluation is based on metrics such as saturation throughput or packet losses, and therefore its mapping to QoE (which is particularly relevant in the case of video) is not clear.…”

Performance evaluation of the V2I fair access with a finite retry limit

“…In [8], Sun and Dai constructed a framework to observe the effect of the retry limit on the performance optimization of the DCF mechanism. In [9], Banchs et al constructed a model to evaluate the 802.11aa performance with retry limit. In [10], Gupta and Rai proposed a model to evaluate the performance of the DCF mechanism with a retry limit.…”

“…The notations in the Markov chain are introduced in Table 1. Like most related work [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], we assume that the collision probability is equal for different transmission and the channel is ideal; a collision occurred only when two nodes within a same communication range transmit packets at the same time.…”

Delay model of multicast protocols co‐existing with legacy unicast in IEEE 802.11 wireless local area network

“…Banchs et al [15] introduced an analytical model for estimating the average throughput of multicast protocols and proposed an algorithm of selecting the best protocol for various scenarios. In [16], Salvador and others implemented 802.11 GATS using commodity WLAN interface cards.…”