| 摘要: |
| 针对无线传感器网络中控制信道饱和问题以及三重隐终端问题,提出了一种异步多信道MAC 协议—— RIM(receiver-initiated MAC).RIM 利用接收端开始的传输机制有效地解决了控制信道饱和问题,同时采用了基于概率的随机信道选择机制避免了三重隐终端问题.而且,RIM 支持一种简单且可靠的异步广播机制.通过基于马尔可夫链的理论分析,得到了RIM 中节点的最优占空比.为验证RIM 的实际性能,进行了模拟和真实实验.实验结果表明, 与其他多信道MAC 协议相比,随着信道数及网络负载的增加,RIM 增加了网络吞吐量,降低了传输所消耗的能量,同时也提高了广播的可靠性,达到了能量有效的目的. |
| 关键词: 无线传感器网络 多信道MAC 协议 多跳隐终端 多信道隐终端 睡眠隐终端 控制信道饱和 |
| DOI：10.3724/SP.J.1001.2012.03984 |
| 分类号: |
| 基金项目:国家自然科学基金(61070193, 60803015); 黑龙江省科技攻关项目(GC09A109); 中国博士后基金(20080430902); 黑龙江省博士后基金(LRB08-021); 黑龙江省教育厅重点项目(1154Z1001) |
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| Asynchronous Multi-Channel MAC Protocol for WSNs |
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ZHANG De-Sheng1,2, LI Jin-Bao1,2, GUO Long-Jiang1,2
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1.School of Computer Science and Technology, Heilongjiang University, Harbin 150080, China;2.Key Laboratory of Database and Parallel Computing of Heilongjiang Province, Harbin 150080, China
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| Abstract: |
| To tackle control channel saturation and triple hidden terminal problems, this paper proposes RIM, a receiver-initiated multi-channel MAC protocol with duty cycling for WSNs. By adopting a receiver-initiated transmission scheme and probability-based random channel selection, RIM effectively alleviates, if not completely eliminates, control channel saturation and triple hidden terminal problems. In addition, RIM exploits a simple but reliable asynchronous broadcast scheme to solve the problem of broadcast data loss with reliable broadcast-intensive applications. More importantly, RIM is fully distributed with no requirements of time synchronization or multi-radio. Therefore, RIM is very easily implemented in resource-constrained sensor nodes. Via the theoretical analysis, the optimal duty cycle are obtained, respectively. The simulation and real testbed experimental results show that RIM achieves significant improvement in energy efficiency with increasing benefit when the number of channels and traffic loads increase, while maintaining higher throughput. Moreover, RIM exhibits a prominent ability to enhance its broadcast reliability. |
| Key words: WSN multi-channel MAC protocol multi-hop terminal multi-channel terminal sleep hidden terminal control channel saturation |
