The dynamic transmission rate selection feature of IEEE 802.11b WLANs can cause throughput degradation when stations with different transmission rates share the same physical channel. One solution to this problem is to use a Multi-Rate Multi-Channel (MRMC) MAC protocol. However, static channel rate assignment in MRMC can lead to load imbalance across channels. This paper presents a dynamic channel rate assignment scheme for the MRMC MAC protocol. The ns-2 network simulator is used to evaluate the approach in an MRMC WLAN with up to 20 mobile hosts. The simulation results show that dynamic channel rate assignment can improve aggregate TCP throughput by 30-54% compared to static channel rate assignment.
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