The IEEE802.11 protocol proposed the CSMA/CA mechanism [1] which is more adjustable to the application of the wireless channel based on CSMA. This article will analyze the property of the traffic in the multi-hop wireless network, give the definitions and the migration relationship of four channel states, provide a model for the traffic of the nodes and describe the relationship among the part of the parameters based on the IEEE802.11 protocol.

Nowadays motorcades are often used in entertainment and work in our daily life. Accordingly, it has become our major concern about ensuring the security of a motorcade, improving coordination of all the vehicles in the course of driving and increasing the efficiency of accomplishing various tasks. This paper proposes an idea about devising a motorcade monitoring system, designs a functional structure of the system, constructs a motorcade structure model according to its features and sets the distance between vehicles at different speed as well. ZigBee is selected to apply for monitoring a motorcade by applicable technical analysis. Besides, the effects of mobility of vehicle nodes upon application of ZigBee are analyzed in this paper.