Motorola Corporation

Soeren Henrik Thomsen

Jheroen Pieter Dorenbosch

Richard Lionel Bennett

Casimir Karczewski

Charles A Sherwood, Ii

A messaging system transmits to a subscriber unit ( ) on a plurality of channels ( ) operating concurrently. The system transmits ( ) control information for the subscriber unit on a control channel assigned to the subscriber unit, and transmits ( ) a personal message fragment intended for the subscriber unit on a first channel. The system also transmits ( ) a group-call message fragment that may be intended for the subscriber unit on a second channel. Before transmitting, the system schedules ( ) the transmission such that the probability that the personal and group-call message fragments will overlap temporally with one another and that either of the fragments will overlap temporally with the control information is reduced.

Method and apparatus for limiting message loss and message latency in a messaging system

A communication device (140) for receiving and decoding a codeword of predetermined length, wherein the codeword includes information and parity bits, comprises a memory (315) for storing the codeword in the form of segments, wherein each segment comprises multiple bits forming bit combinations. A first look-up table (326, 327, 328, 329) included in the communication device (140) stores parity vectors corresponding to the bit combinations, and a second look-up table (325) stores values corresponding to syndrome vectors. A processing unit (310) coupled to the memory (315) and the first and second look-up tables (325-329) uses the bit combinations of the segments as indices into the first look-up table (326-329) to locate corresponding parity vectors, adds the corresponding parity vectors using modulo 2 arithmetic to form a resulting syndrome, and uses the resulting syndrome as an index into the second look-up table (325) to locate an erroneous bit included in the codeword. In similar manner, the communication device (140) can encode parity bits into the codeword using the reduced-processing method.

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Gentofte, Denmark

Soeren Henrik Thomsen