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| Network Mobility Basic Support Protocol (NEMO BS) is a protocol proposed for the mobility management of mobile networks. It provides a group of mobile devices with seamless Internet connectivity, and it can be used in the vehicle communication and disaster rescue. However, NEMO BS cannot deal with the problem of pinball routing in the nested mobile network which would heavily increase the communication cost. This article puts forward a novel route optimization solution to solve pinball routing. The mobile routers under the same access router compose an ad hoc network. In the ad hoc network all messages are routed by Optimized Link State Routing (OLSR) protocol. The Mobile Routers will be divided into Grounded Mobile Routers (G-MR) and Non Grounded Mobile Routers according to their connectivity to the Internet at a moment. Ground Mobile Routers should do the works as a gateway for all of the Non Grounded Mobile Routers in the ad hoc network, and the Non Grounded Mobile Routers will keep a G-MR information list to choose the optimized G-MR after evaluating its parameters. Then the messages from the mobile nodes will be delivered through the tunnel established by G-MR to the Internet. By doing this, pinball routing can be avoided. The simulation result of the OPNET software shows that this solution can reduce the number of encapsulation level, decrease the transmission latency effectively, and improve the network communication efficiency. |
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| Keywords:network mobility, route optimization, OLSR , pinball routing |
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