CSMA Self-Adaptation Based on Interference Differentiation

This paper addresses the design challenge of interference mitigation in the emerging high density (HD) wireless LAN. It is proposed to differentiate interference according to their energy and timing relative to desired signal, and measure packet error rate (PER) locally at transmitter for each type of interference. Then, self-adaptation algorithms are designed to adjust a) clear channel assessment (CCA) threshold, aka physical carrier sensing threshold, to leverage spatial reuse for achieving higher aggregate throughput, and b) transmit power (TP) to compensate location difference among links, and prevent individual links from starving. Compared to an end-to-end (E2E) feedback loop, ours has negligible complexity and zero over-the-air overhead. Extensive OPNET simulations are used to compare the performance of our solutions against the legacy and the ideal.

[1]  Hongqiang Zhai,et al.  Physical Carrier Sensing and Spatial Reuse in Multirate and Multihop Wireless Ad Hoc Networks , 2006, Proceedings IEEE INFOCOM 2006. 25TH IEEE International Conference on Computer Communications.

[2]  Marwan Krunz,et al.  POWMAC: a single-channel power-control protocol for throughput enhancement in wireless ad hoc networks , 2005, IEEE Journal on Selected Areas in Communications.

[3]  Jing Zhu,et al.  Adaptive CSMA for Scalable Network Capacity in High-Density WLAN: A Hardware Prototyping Approach , 2006, Proceedings IEEE INFOCOM 2006. 25TH IEEE International Conference on Computer Communications.

[4]  Jing Zhu,et al.  Adapting physical carrier sensing to maximize spatial reuse in 802.11 mesh networks , 2004, Wirel. Commun. Mob. Comput..

[5]  Nitin H. Vaidya,et al.  On the physical carrier sense in wireless ad hoc networks , 2004 .

[6]  Nitin H. Vaidya,et al.  Selecting transmit powers and carrier sense thresholds in CSMA protocols for wireless ad hoc networks , 2006, WICON '06.

[7]  Qian Zhang,et al.  PASA: power adaptation for starvation avoidance to deliver wireless multimedia , 2003, IEEE J. Sel. Areas Commun..

[8]  Ansi Ieee,et al.  Part11 : Wireless LAN Media Access Control (MAC) and Physical Layer (PHY) Specifications , 1999 .

[9]  Nitin H. Vaidya,et al.  Selecting transmit powers and carrier sense thresholds for CSMA protocols , 2004 .

[10]  Jing Zhu,et al.  Leveraging spatial reuse in 802.11 mesh networks with enhanced physical carrier sensing , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

[11]  Sumit Roy,et al.  Optimizing 802.11 Wireless Mesh Network Performance Using Physical Carrier Sensing , 2006 .