A State-Based Dynamic Location Management Scheme

We consider a state-based dynamic location management scheme, in which, the user is partitioned into different mobility state set. And its location area size is changed dynamically corresponding to the state set that it belongs to. Comparing with the fixed LA scheme, numerical experiment result shows it's performance can be improved by 30% while the current location and paging procedure can still be applied. Besides, as this scheme need not process complicated user information, the requirement of computing power decreases significantly than the user-based schemes. Our scheme can be used in current 2G mobile systems (such as GSM, CDMA) and the third generation (3G) mobile systems with slightly modifying of the equipment software.

A distributed location management strategy for next- generation IP-based wireless networks

Location management is the most important function in mobility management technology. The hierarchical structure of the proposed hierarchical network-layer mobility management （HNMM） can reduce the signaling cost. The selforganizing topology scheme can enhance the robustness and quality of the mobility management. The information of location of the mobile node is stored in the distributed database, which makes the storage of the location information more reliable and robust, and more flexible strategies can be used. The numeric results show that HNMM can provide better performance than the general structure of mobile IPv6, when the mobile nodes move frequently and when there is high traffic throughput.

An IP mobility management scheme with dual location areas for IP/LEO satellite network

One of the issues of mobility management in a low Earth orbit (LEO) satellite network is the high-frequency location binding update initiated by mobile nodes (MNs).To solve this problem,we propose a location management scheme based on dual location area (LA) in an IP/LEO satellite network.The proposed scheme uses two kinds of LA,the fixed Earth station LA and satellite LA,to manage the location of the MNs together.MNs operate the binding update procedures only when they are moving out of both of the two LAs last registered.Geographical location information of MN is used in the binding update procedures,so that the network can page the idle MNs near their last registered location first,to enhance the probability of paging success.A detailed description of the implementation of the scheme is provided.Mathematical analysis shows that the proposed scheme reduces the location management cost and minimizes the influences of the distance between MN and its home agent.Paging cost is also reduced by introducing geographical location information in the binding update procedures.

A General Probability Formula of the Number of Location Areas＇ Boundaries Crossed by a Mobile Between Two Successive Call Arrivals

Mobility management is a challenging topic in mobile computing environment.Studying the situation of mobiles crossing the boundaries of location areas is significant forevaluating the costs and performances of various location management strategies. Hitherto, severalformulae were derived to describe the probability of the number of location areas' boundariescrossed by a mobile. Some of them were widely used in analyzing the costs and performances ofmobility management strategies. Utilizing the density evolution method of vector Markov processes,we propose a general probability formula of the number of location areas' boundaries crossed by amobile between two successive calls. Fortunately, several widely-used formulae are special cases ofthe proposed formula.

Difference-less mobility management network

Core systemtechnology is a key factor in the next generation network(NGN).Adifference-less mobility management network is proposed to better support the mobility of an IP multimedia subsystem(IMS).This kind of network can provide good service and user mobility,enabling local user access to the network anywhere.User location management and session creation are analyzed.The results show that under this network architecture,the cost of the user location registration and session creation is lower than that of the home control model employed by the IMS.