| 无线Ad hoc网络中协作重传机制的改进 |
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| 引用本文： | 李屹,纪红,马书惠. 无线Ad hoc网络中协作重传机制的改进[J]. 北京邮电大学学报, 2007, 30(4): 23-27 |
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| 作者姓名： | 李屹 纪红 马书惠 |
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| 作者单位： | 北京邮电大学,泛网无线通信教育部重点实验室,北京,100876;北京邮电大学,泛网无线通信教育部重点实验室,北京,100876;北京邮电大学,泛网无线通信教育部重点实验室,北京,100876 |
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| 基金项目： | 国家自然科学基金,国家高技术研究发展计划(863计划) |
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| 摘 要： | 基于协作式停等协议,提出了无线Ad hoc网络中改进的协作重传机制. 第一,区分协作和非协作的帧,防止应答对象的混淆和协作扩散;第二,在节点内部设定业务流优先级,确保协作重传的帧能被优先发送;第三,采用基于优先级的退避机制,选择瞬时最优节点重传数据. 理论分析和仿真结果表明,改进的协作重传机制可以有效降低重传碰撞概率,提高重传成功率,并改善系统吞吐量.
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| 关 键 词： | 协作重传 业务优先级 重传成功率 Ad hoc网络 |
| 文章编号： | 1007-5321（2007）04-0023-05 |
| 修稿时间： | 2006-09-28 |
Improvements on Cooperative Retransmission Scheme in Wireless Ad hoc Networks |
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| LI Yi,JI Hong,MA Shu-hui. Improvements on Cooperative Retransmission Scheme in Wireless Ad hoc Networks[J]. Journal of Beijing University of Posts and Telecommunications, 2007, 30(4): 23-27 |
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| Authors: | LI Yi JI Hong MA Shu-hui |
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| Affiliation: | Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China |
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| 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. |
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| Keywords: | cooperative retransmission traffic priority probability of successful retransmission Ad hoc network |
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