Sung Goo Cho Hyun Ku Jeong Joong Soo Ma Performance Optimization Technique of Location Registration in Public Transportation. 22-29 2002 conf/cdma/2002 CDMA International Conference http://link.springer.de/link/service/series/0558/bibs/2524/25240022.htm db/conf/cdma/cdma2002.html#ChoJM02