Service differentiation in wireless LANs based on capture

We investigate the effects of using a dual transmission power scheme for quality-of-service (QoS) differentiation in IEEE 802.11 wireless LANs. By setting hosts to transmit at different power levels, we enhance the likelihood that a high-power frame gets received correctly when a collision involving frames from both power levels occurs due to the capture effect. We develop a Markov model for the IEEE 802.11 DCF in a dual transmission power system over a Rayleigh-fading channel, and use it to evaluate the resulting performance, in terms of the key metrics of throughput and delay. Specifically, we study how the performance of the service classes depends on the proportion of hosts from each service class and the transmission power ratio, and demonstrate that, counter-intuitively, this dependence may be non-monotonic

[1]  Norman Abramson,et al.  The ALOHA System-Another Alternative for Computer Communications , 1899 .

[2]  Robert H. Deng,et al.  Capture model for mobile radio slotted ALOHA systems , 1998 .

[3]  A. Girotra,et al.  Performance Analysis of the IEEE 802 . 11 Distributed Coordination Function , 2005 .

[4]  J. Metzner,et al.  On Improving Utilization in ALOHA Networks , 1976, IEEE Trans. Commun..

[5]  Zoran Hadzi-Velkov,et al.  Capture effect with diversity in IEEE 802.11b DCF , 2003, Proceedings of the Eighth IEEE Symposium on Computers and Communications. ISCC 2003.

[6]  Lawrence G. Roberts,et al.  ALOHA packet system with and without slots and capture , 1975, CCRV.

[7]  Davide Dardari,et al.  On the capacity of slotted Aloha with Rayleigh fading: the role played by the number of interferers , 2000, IEEE Communications Letters.

[8]  Zoran Hadzi-Velkov,et al.  An analysis of CSMA/CA protocol with capture in wireless LANs , 2003, 2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003..

[9]  Jae-Hyun Kim,et al.  Capture effects of wireless CSMA/CA protocols in Rayleigh and shadow fading channels , 1999 .

[10]  Cyril Leung,et al.  Capture models for mobile packet radio networks , 1990, IEEE International Conference on Communications, Including Supercomm Technical Sessions.

[11]  Michele Zorzi,et al.  On the randomization of transmitter power levels to increase throughput in multiple access radio systems , 1998, Wirel. Networks.

[12]  Theodore Antonakopoulos,et al.  CSMA/CA performance under high traffic conditions: throughput and delay analysis , 2002, Comput. Commun..