In this paper, group registration schemes using Bluetooth are proposed to reduce contention of registration messages for transportation systems (TSs) in personal communication networks (PCNs). Group registration access point (GRAD), that is specially designed for group registration, is attached to TS, and finds and controls mobile stations (MSs) on TS using Bluetooth. When it finds CRAP, MS delegates its registration duty to CRAP. Ac-cording to interaction method between CRAP and PCNs, proposed schemes are divided into Emulation and Tracing.
In Emulation, GRAP holds all information of delegated MSs and sends registration messages one by one, as if CRAP is one of delegated MSs. In Tracing, however, intelligent node (TN) is added to PCNs to support group registration. IN is in front of home location register (HLR), filters out and processes group registration messages which are sent by GRAPs, and stores these messages to HLR. The advantage of Emulation is that there is no modification of PCNs, and one of the Tracing is maximum reduction of number of registration trials.
Also, registration delegation, group registration, call delivery, and delegation cancellation procedure are described for Emulation and Tracing, respectively.
We analyze the performance of our proposed schemes, in two points of view; success rate and delay of registration_ Compared with IS-95B/2000 registration scheme, Emulation and Tracing significantly reduce then contention between registration messages caused by the large number of MSs in TS which moves at high speed. The performance of Tracing is slightly better than that of Emulation, however as delegation rate is increased, the difference is reduced.
