Topology-Transparent STDMA Protocol with MIMO Link for Multicast and Unicast in Ad Hoc Networks

摘要

Most of the MIMO MAC protocols are used for either unicast or multicast instead of supporting both simultaneously, which could be a limitation in practical application. Furthermore, SISO-based traditional STDMA could lower the network throughput. So TTS-MIMO is newly designed by exploiting MIMO to raise the network throughput, which could support both unicast and multicast at the same time. By collecting and calculating the cross layer information which could affect the performance of multicast and unicast, the slot allocated to a node is determined dynamically. Utilizing the stream control technology of MIMO and reservation scheme, in the allocated slot, a node sends data packet of unicast or multicast directly, and in the unallocated idle slots, the node reserves the channel or sends data packet of multicast. Finally the simulation results show that the TTS-MIMO outperforms the STDMA in terms of throughput and slot utilization rate, in addition, the system QoS is improved since multicast and unicast are both supported.