关键词: 协作重传, 业务优先级, 重传成功率, Ad hoc网络

Abstract:

An improved cooperative retransmission scheme based on node cooperative stop and wait automatic repeat request （ARQ） protocol is proposed. In order to avoid ambiguous acknowledgement or negative acknowledgement (ACK/NAK) and diffusion of cooperation process, cooperative and noncooperative frames are distinguished. Traffic categories within each node are introduced so that cooperative frames can be sent in advance. According to instantaneous channel conditions, the “best” partner is selected to help the source retransmit data. Analytical and simulation results indicate that improved scheme can alleviate collision problem caused by cooperation, increase probability of successful retransmissions and enhance system throughput.

Key words: cooperative retransmission, traffic priority, probability of successful retransmission, Ad hoc network