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Channel Heterogeneity Aware Channel Assignment for IEEE 802.11 Multi-Radio Multi-Rate Wireless Networks

IEEE 802.11 다중 라디오 다중 전송률 무선 네트워크를 위한 채널 이질성 인지 채널 할당

  • Received : 2011.10.21
  • Published : 2011.11.30

Abstract

IEEE 802.11 devices are widely used, and terminals can be equipped with multiple IEEE 802.11 interfaces as low-cost IEEE 802.11 devices are deployed. The off-the-shelf IEEE 802.11 devices provide multiple channels and multiple data rates. In practical multi-channel networks, since there is channel heterogeneity which indicates that channels have different signal characteristics for the same node, channels should be efficiently assigned to improve network capacity. In addition, in multi-rate networks, low-rate links severely degrade the performance of high-rate links on the same channel, which is known as performance anomaly. Therefore, in this paper, we propose a heterogeneity aware channel assignment (HACA) algorithm that improves network performance by reflecting channel heterogeneity and performance anomaly. Through NS-2 simulations, we validate that the HACA algorithm shows improved performance compared with existing channel assignment algorithms that do not reflect channel heterogeneity.

Acknowledgement

Supported by : 한국연구재단

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