Motorola Corporation

Hooman Kashef

Valy Lev

Paul M Erickson

Kamala D Urs

Merle L Gilmore

Communication systems having single switching center configurations (100) or multiple switching center configurations (200) detect the occurrence of a mobile-to-mobile call using control messages. When it is determined that the call is mobile-to-mobile, a switching center (101) in the single switching center configuration instructs transcoders (121-123) to operate in a transparent mode. Likewise, when it is determined that the call is mobile-to-mobile, multiple switching centers (201-203) the multiple switching center configuration instruct transcoders (221-223) to operate in the transparent mode. While operating in the transparent mode, the transcoders do not convert compressed digital voice (402) to non-compressed digital voice (401) and vice versa, but do allow the compressed digital voice to pass through as bit-stuffed compressed digital voice (403) and vice versa.

Method for communications between mobile units using single and multiple

A TDMA radio communication system provides communication service to a plurality of mobile communication units through use of a TDMA frame. The TDMA frame includes a plurality of timeslots that are distributed across a TDMA frame duration and are used to facilitate communications involving a first mobile and a second mobile. Audio delays are reduced using a method that includes the steps of measuring a hold time for each of the mobiles, and determining a present aggregate hold time based at least in part on the measured hold times. When the present aggregate hold time exceeds the TDMA frame duration, the method provides for the re-assignment of at least one of the mobiles to an alternate timeslot within the TDMA frame.

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Hoffman Estates, IL, United States of America

Hooman Kashef