Mobile telephone system call processing arrangement

Details Mobile telephone system call processing arrangement Mobile telephone system call processing arrangement

1993-01-21

1994-01-11

Ng, Jin F.

Telephonic communications

Audio message storage, retrieval, or synthesis

379 94, 379229, 370 50, 370 581, 370 80, 370 93, H04M 1100, H04M 700, H04J 400, H04Q 1104

Patent

active

052788920

ABSTRACT:
A CDMA cellular radio-telephone system (FIG. 2) 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 (302 in FIG. 7) for each unidirectional virtual call path, direct cell (202)-to-cell and cell-to-call-processing unit (264 in FIG. 5) 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 (FIGS. 27-29) to be handled in a manner transparent to the parties to the call and without significant involvement of system control elements (134 and 261 in FIG. 2) 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.

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