A Cross-Layer Approach for WLAN Voice Capacity Planning

— This paper presents an analytical approach to determining the maximum number of on/off voice flows that can be supported over a wireless local area network (WLAN), under a quality of service (QoS) constraint. We consider multiclass distributed coordination function (DCF) based medium access control (MAC) that can provision service differentiation via contention window (CW) differentiation. Each on/off voice flow specifies a stochastic delay bound at the network layer as the QoS requirement. The downlink voice flows are multiplexed at the access point (AP) to alleviate the MAC congestion, where the AP is assigned a smaller CW compared to that of the mobile nodes to guarantee the aggregate downlink throughput. There are six-fold contributions in this paper: 1) a nonsaturated multiclass DCF model is developed; 2) a cross-layer framework is proposed, which integrates the network-layer queueing analysis with the multiclass DCF MAC modeling; 3) the channel busyness ratio control is i...

• Type: Journal
• Year: 2007
• Where: JSAC
• Authors: Yu Cheng, Xinhua Ling, Wei Song, Lin X. Cai, Weihua Zhuang, Xuemin Shen
• Keywords: JSAC 2007, Multiclass Dcf, Multiclass Dcf Model, Wireless Local Area Network