Research On Low-orbit Satellite Mobile Handoff Protocol Based On Terminal Geographical Location

The lack of space-based information network development in the whole airspace will make it difficult to flexibly deploy all kinds of new technologies related to national economic interests,resulting in severe challenges in the development of new technologies,national interests and security.Therefore,the construction of China's autonomous and controllable space-based information network,which meets the needs of the military and civilian sectors,is in line with the future development trend of national information technology.It can promote the realization of the good wish of "information is at your disposal and everything touches at your fingertips",and promote the rapid growth of national strategies,economic and social fields.Satellite communication network is the main driving force of space-based information network construction.This paper takes LEO satellite network as the research background.Aiming at the limitation of current LEO satellite mobility management protocol,a LEO satellite mobile handover protocol based on terminal geographic location is proposed.The protocol replaces the CoA(Care of Address)configuration based on the link information of access point in mobile IP technology with the location information of mobile terminal,and sends the location information of mobile terminal to the ground control center for updating storage in collaboration with access satellite for locating mobile terminal.When the mobile terminal does not move for a period of time after updating its position,because its position has not changed,it is not necessary to interact with the ground control center again to update its position even if the satellite movement causes the change of the mobile terminal's access satellite,so as to simplify the signaling interaction process and reduce the bandwidth occupation in the LEO satellite communication network.In addition,this protocol proposes a load balancing strategy for transit satellites.Next,the registration,handover and communication processes involved in the protocol are described in detail.In the LEO satellite scenario,the mobile IP protocol,the mobility management protocol based on the separation of identity and location,and this protocol are simulated by using STK and QualNet,respectively.The feasibility of the protocol is verified,and the performance parameters such as delay,delay jitter and packet loss rate are compared and analyzed.The experimental results show that this protocol performs better than the other two protocols in terms of delay,delay jitter and packet loss rate.Even if the mobile terminal is in a high-speed motion state,the packet loss rate can always be maintained at a low level,and the delay is relatively stable.Load balancing experiments show that the traffic of the transit satellite is well balanced.Finally,the work in this paper is summarized,the advantages and limitations of this protocol are analyzed,and the future optimization work is prospected.