Mobile-telephone system call processing arrangement.

摘要

A CDMA cellular radio-telephone system comprises a packet-switched communications network (202, 207, 201) that interconnects cells (base stations; 202) with each other and with the public telephone network (100). A unique combination of a static addressing plan that uses a different LAPD DLCI for each unidirectional virtual call path, direct cell (202)-to-cell and cell-to-call-processing unit control information exchanges, and packet-switching techniques that permit call traffic and control communications to share call paths and permit different call paths to share physical resources, is applied to call processing. This enables soft handoffs to be handled in a manner transparent to the parties to the call and without significant involvement of system control elements (134 and 261) whose involvement would adversely impact the system's call-handling capacity. It also enables soft handoffs to occur without change of the call processing unit that is handling the call, so that a single call processing unit continues to handle the call from start to finish through even multiple soft handoffs. <IMAGE>