Mobility and power management schemes in mobile communication networks

Abstract

This dissertation is concerned with mobility and power management schemes in mobile communication networks. First, a location management scheme is proposed for subscribers with portable personal numbers, or non-geographic phone numbers (NGPNs) in future mobile networks. Under the assumption of local property in both called party distribution and user mobility, the proposed scheme is based on a three-level hierarchical database architecture. In addition to inherently providing non-geographic phone numbers, the proposed scheme reduces the number of database access attempts and the signaling cost for location management. Second, a mobility management scheme is proposed to support universal personal telecommunication (UPT) users roaming in a mobile network. UPT user service profiles are replicated from the home UPT network to SCP in the visited mobile network. Location and power on/off state information of the mobile terminal on which the UPT user has registered is managed in the SCP of the visited network as well as in the terminal location registers. Performance of the proposed scheme is evaluated in terms of the signaling cost, the number of node accesses, the network cost for UPT call delivery, and the total network cost during an InCall registration. Third, a mobility management scheme is introduced in IP-based mobile networks. Mobile users may turn their mobile hosts o? for saving battery power or for avoiding unwanted incoming packets. Furthermore, registration of approximate location information for an idle mobile host can facilitate effcient power management for mobile hosts. The mobility management scheme manages communicating, attention, idle, and detached states. The mobility management scheme that a power-off action is detected through binding-lifetime-based registrations is analyzed. The steady state probabilities for the mobile host state transitions are derived using a semi-Markov process approach. Then, an optimal value of registrat...