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TRANSMITTER IDENTIFICATION BITS EXTENSION

IP.com Disclosure Number: IPCOM000007105D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2002-Feb-26
Document File: 2 page(s) / 93K

Publishing Venue

Motorola

Related People

Steven J. Goldberg: AUTHOR

Abstract

The FLEX Paging Protocol has 16 bits available between the A and /A synchronization code words. These bits may be used for transmitter identifica- tion. The fixed number of bits available however restricts the number of unique identifiers that are possible.

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Technical Developments Volume 21 February 1994

TRANSMITTER IDENTIFICATION BITS EXTiNSlbN

by Steven J. Goldberg

  The FLEX Paging Protocol has 16 bits available between the A and /A synchronization code words. These bits may be used for transmitter identifica- tion. The fixed number of bits available however restricts the number of unique identifiers that are possible.

  The following implementation allows the differ- entiation of multiple occurrences of a 16 bit block, thus increasing the effective bits available for identi- fication. It will be described in two forms. Each has its advantages and disadvantages as will be explained.

  In both methods all transmitters send out the same pattern for E(xtension) bits. The pagers should therefore always decode them without intertrans- mitter interference. The 16-E remaining bits are used for a portion of the unique identifier from each transmitter.

Shown below is the relationship of FLEX syncs and the available 16 bits in the code:

. ..AO...A3lNO...Nl5/AO.../A31...

.AO.. A311ONl.. .NlYAO.. JA31.. .continuation of identifier

AO.. .A3lOONl.. .Nl5/AO.. ./A31.. .sync

  There is no mathematical limit to the number of blocks between sync% A practical limit however is imposed by concerns such as battery life and delay times.

METHOD B-Block Numbering

  E(xtension) bits are reserved for numbering the transmitter identifier blocks. The bits available for identifier encoding are therefore 16-E. Since the num- ber of possible blocks is 2E, there are 2E*[l6-E] bits available for identification. The E = 2 case is:

..AO. ..A311011Nl. .rNlS/AO.. ./A31. ..end

. ..AO...A3l0001Nl...N15/AO.../A31...start

AO.. .A3llOOlNl.. .NlS/AO.. ./A31.. .continua- tion of identifier

. .AO.. .A3lOOllNl.. .N15/AO.. JA31.. .continua- tion of identifier

.AO.. .A3llOllNl.. :Nl5/AO.. ./A31.. .end

. ..AO...A31000lNl...Nl5/AO.../A3l...start

METHOD A-Synchronizetion Pattern

  The first bit of the 16 between the sync words has been set to zero. This is the sy...