| The underground environment of coal mine is bad and working face is advanced dynamically with the mining, wireless nodes may be damaged by some factors such as microquake, coal falling and energy depletion. When using traditional wireless sensor networks, the communication links will connected intermittently or not, even the entire communication network paralysis and information cannot be transferred. To deal with the traditional wireless sensor networks that exist in link interruption, energy hole, low robustness, it uses an opportunistic network that does not depend on the end-to-end integrity of the communication link. This paper studied the opportunity network routing algorithm and put forward improved mechanisms on the background of coal mine.In view of mine safety monitoring system, it is proposed a multiple copy routing algorithm based on hybrid strategy, which called MCBHS. This algorithm improved classic Spray and Focus in dissemination and forwarding stage, abandoned the blind forwarded and shortcomings. In dissemination stage, using the node activity and residual energy as indicators. Information can be quickly spread across a large area, at the same time, it also can balance the network energy. In forwarding stage, it can determine the move direction based on the number of static nodes, choose the direction closer to the target node to forward packets, so as to improve the efficiency of forwarding.Aiming at the abnormal information in the mine, take message priority into account above MCBHS, a routing algorithm called HSBMP is proposed. By giving higher priority to abnormal information to ensure abnormal information use network resource in advance. At the same time doubling the number of copies, so as to improve the delivery ratio and reduce the average latency.Finally, using ONE simulation software to build the simulation platform of coal mine, The simulation analysis shows that the performance of MCBHS algorithm is better than Epidemic, Spray and Wait when the number of moving node and the cache size changes, HSBMP algorithms on the transmission of high priority messages compared with MCBHS algorithms, the success rate have greatly improved, and reduced the delay. |
