【摘要】 多媒体传感器网络作为一种多媒体信息获取和处理方式,已在军事、民用及商业领域中显示出广阔的应用前景.信道接入协议能否高效地使用无线信道是保证无线多媒体传感器网络通信的最关键的因素之一.分析支持多媒体业务传输的无线传感器网络信道接入协议的要求,提出适于多媒体传感器网络提供区分服务的信道接入协议——DSMAC(different service medium access control),对实时业务与非实时业务实现了区分服务,在信道接入帧内的随机竞争期实现突发业务及时接入,支持突发多媒体业务实时传输,并提出了多信道簇间传输方式,避免了隐终端冲突.最后,对协议的服务区分、实时性、吞吐量以及能量有效性等性能进行了仿真实验,验证了其优良性能.更多还原

【Abstract】 Wireless multimedia sensor network (WMSN),as a multimedia information acquiring and processing technology,make potential applications span a wide spectrum from military to industrial fields.Research on wireless multimedia sensor network relates to many techniques.Medium access control (MAC) is at the core of effective communication.Owing to the energy constraints of the small,battery-powered sensor nodes,it is desirable that the medium access control protocol enable reliable,error-free data transfer with minimum retransmissions while supporting application-specific QoS requirements.There is some type of traffic with different QoS requirement in WMSN.Real-time traffic services demand low-latency.And,non-real-time traffic services demand high reliability.A different service medium access control (DSMAC) is presented for wireless multimedia sensor network.The four-channel protocol can support different service between real-time traffic using TDMA and non real-time traffic using contention based technology.It can support transmission of burst multimedia traffic through insert random contention period into frame.And a multi-channel inter-cluster transmission to avoid hidden terminal problem is proposed.Simulation analysis results and experimental results of difference-service,real-time,throughput,energy-efficiency,etc.show DSMAC is more suitable for wireless multimedia sensor network than other MAC protocols.Preliminary performance of DSMAC in real world system is discussed at the end.更多还原