Modified group method for mobility management

The Group Method as identified in IS-41 standard was modified in this study to be dual group system to identify the optimal group size and to cope wit h the location tracking problem of the wireless system. The Group Method ca n effectively reduce the loading of the network caused by tracking mobile u sers in a mobile cellular system because it joins several cells to form a g roup. Instead of performing registration and deregistration for each indivi dual in cell, the Group Method performs these tasks on a group scale. Moreo ver, the Dual Group Method saves network resources because it eliminates un necessary location updates due to its fewer group boundary passes. This study also evaluates the cost ratios between the Basic Method and the Group Method. The effectiveness of this scheme is illustrated in the follow ing two examples. First, the Group Method offers a saving about 40% of netw ork resources (a reducing rate of 0.589) when the Call-to-Mobility Ratio (C MR) (R. Jain, Y.-B. Lin, C. Lo, S. Mohan, Proc. INFOCOM'95, (1995) 481-489; IEEE J. Select. Areas Commun., 12(8), (1994)), and the cost of message tra nsmission/cost of database transaction (TDCR) is equal to 0.2. Second, abou t 15% of system resources are saved (a reducing rate is 0.847); when the CM R is equal to 0.5 and the TDCR is equal to 0.4. Results in this study demon strate that the Group Method yields significant benefits in terms of reduci ng rate and that the Dual Group system is more beneficial. (C) 2000 Elsevie r Science B.V. All rights reserved.