MIMO Ad Hoc网络中一种新的流控多址接入协议

摘要

Considering the throughput reduction caused by the packet collision of the PRP-MAC, a novel Stream Control Multiple Access Protocol with Collision Avoidance ( SCMA-CA ) protocol for Multiple Input Multiple Output ( MIMO) Ad Hoc network is proposed in this paper. Based on the control packets defined in PRP-MAC, SCMA-CA introduces a new type of Clear to Send( CTS) packet,implements collision avoidance and maximizes stream number by employing MIMO technology. The simulations are conducted to evaluate the performance of the proposed protocol. The results show that SCMA-CA can effectively eliminate collisions between control packets and data packets when transmitters increasing in the network. Other than the network throughput improvement,SCMA-CA can also be applied in antenna-heterogeneous environments,which enhances the proposal’ s applicability.%针对PRP-MAC协议中分组冲突导致网络吞吐量减小的问题，提出一种带有冲突避免机制的流控多址接入协议SCMA-CA。该协议可用于MIMO Ad Hoc网络，其在PRP-MAC定义的控制分组基础上，新增CTS分组类型，并利用MIMO技术的流控能力实现冲突避免和最大化数据流数目。仿真结果表明， SCMA-CA协议不仅可避免发送节点数增加时控制分组和数据分组的冲突，提高网络吞吐量，同时又适用于天线多样化的环境，能有效增强网络性能。