A Multiple Relay-Based Medium Access Control Protocol in Multirate Wireless Ad Hoc Networks With Multiple Beam Antennas
The advanced technique of multiple beam antennas is recently considered in wireless networks to improve the system throughput by increasing spatial reuse, reducing collisions, and avoiding co-channel interference. The usage of multiple beam antennas is similar to the concept of Space Division Multiple Access (SDMA), while each beam can be treated as a data channel. Wireless networks can increase the total throughput and decrease the transmission latency if the physical layer of a mobile node can support multirate capability. Multirate wireless networks incur the anomaly problem because low data rate hosts may influence the original performance of high data rate hosts. In this paper, each node fits out multiple beam antennas with multirate capability, and a node can either simultaneously transmit or receive multiple data on multiple beams.