Space sense random access with collision mitigation in uplink WLANs
IEEE Communications Letters
Cooperative wireless medium access exploiting multi-beam adaptive arrays and relay selection
IEEE Transactions on Signal Processing
APCC'09 Proceedings of the 15th Asia-Pacific conference on Communications
Reliable Key Management and Data Delivery Method in Multicast Over Wireless IPv6 Networks
Wireless Personal Communications: An International Journal
IEEE 802.15.4 MAC for clustered WSNs with a directional framework
International Journal of Sensor Networks
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Wireless LANs with multi-beam directional antennas have received intensive attention lately due to the potential gain in throughput performance. However, when the multi-beam directional antennas are introduced in this system, the ever popular contention-based medium access control protocol such as IEEE 802.11 MAC is no longer effective, and many challenging problems, such as beam-synchronization problem, beam-overlapping problem, mobility and receiver blocking problem (deafness problem), need to be resolved. In this paper, we propose a novel MAC protocol to carefully address these problems. In addition to improving communication efficiency, we also consider the backward compatibility in our design, whereby an IEEE 802.11 terminal can transparently access a multi-beam access point. Furthermore, we present an analytical model to evaluate the performance of multi-beam wireless LANs. Extensive simulation studies are used to validate the analytical model and show that our scheme can significantly improve the throughput performance