| The radio station is in common used as a command tool in modern war, it uses the radio wave as the media to transmit voice,word,data and all kind of battle information. According to the variety characteristic of frequency, radio station can be divided into two types:" fixed-frequency radio" and "hop-frequency radio". Because of the safety's request of the super-speed station's application, the super-speed station should hold the radio silence state when it hasn't the task of data communication, therefore when the super-speed station is working it has two kinds of statuses: communication state and radio silence state. When the station is in radio silence state, it can't keep frequency hopping synchronization with other station , and can't receive the other station the data that send out, and also can't send out any data. If the station that is in radio silence state need communicate with other station, it must turn to communication state.Now the main function of the super-speed radio station primarily is a correspondence that complete the communication of emulation voice between two points, along with the modern war of continuously require with, the use of the super-speed radio station the demand is expanded. It shouldn't only complete the communication of voice between two points, it also should be able to complete the data communication that need more station's join. At the same time because the super-speed radio station may hold in moving state when it's working, the radio station should dynamically select the path for the data transmitting, it indicates that the radio station should have dynamic routing function. Moreover, the network that is constructed with radio station has no center, namely it's ad- hoc. If the station wants to realize on the above function, the radio station must have a protocol system that controls the data communication between stations. Now there are many wireless local network protocols that have been extensively used, those protocols contain bluetooth,IEEE 802.11 series, HomeRF...etc. Those wireless local network protocols all respectively contain it's own characteristics,different application situation and different physic layer. The study can realize data communication that need more station's join but doesn't change the attribute of super-speed radio station, for this reason those wireless local protocols can't directly be applied to super-speed radio station to control the data communication. Solution of this problem is to change,delete and add on the base of IEEE 802.11. Through this can make a new protocol that is suitable for the requirement of super-speed station.The changing part of IEEE 802.11 contain synchronous mechanism and format frame. In the synchronous mechanism of IEEE 802.11 a beacon will be periodically sent out, the manner of beacon will be changed. In this study the beacon will not be periodically sent out. According to the modified protocol some part of the frame format that aren't applicable have been changed. In the new protocol the authentication and privacy, power management and whole physic layer of IEEE 802.11 are deleted. At the same time in order to satisfy the requirement of data communication that need more station's join, wireless route has been added in the new protocol... |
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