| Nodes in satellite networks are moving forever, which decides that its topology is varying, which challenges the researches such as routing for satellite networks. Therefore, mobility management is a very important subject in the researches of satellite networks.Mobility management in MEO/LEO satellite networks is investigated. Continually existing handovers which are caused by relative movements of different orbit altitude satellites would observably decrease the management cost. HIP-MIP scheme proposes the concept of Handover-Independent but only adapts to communications between LEO satellite networks and ground IP networks, can't directly used in satellite networks. Therefore, HIP-MIP scheme is improved and a mobility management scheme based on geographical locations is proposed. The outer space is divided into some three-dimensional cells which are moving on even velocity, which carries out the location updating based on cells crossing but not handover. And the concept of clustering is introduced to be the basis of system topology and routing to improve the mobility management.Existed handover strategies are analyzed. And a kind of new strategy based on link fault checking is proposed, which can decrease the fault rate of routing.A new geographical-based clustering algorithm for MEO/LEO satellite networks management is proposed by introduce the concept of clustering of Ad Hoc networks. The clusterhead and manager are occupied by MEO satellites and agents are occupied by LEO satellites.The outer space including LEOsatellite orbits is divided intosome three-dimensional cells which are moving on even velocity. The cells merge into clusters according to density of LEO satellites. A MEO satellite will be selected as clusterhead by combined weights. The relative mobility and regularity of satellite orbits are considered in the paper meanwhile the manager and agents are definitely set, which provides a new view on satellite networks management. |
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