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COMMON PREFIX COMPRESSION PAGING (CP squared)

IP.com Disclosure Number: IPCOM000006656D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2002-Jan-21
Document File: 3 page(s) / 158K

Publishing Venue

Motorola

Related People

Thaddeus Jakala: AUTHOR

Abstract

Binary only numeric paging has attained large pop- ularity and widespread system implementation over the past few years. The industry trend is to increase the pag- ing information baud rate to allow for additional users and increase paging information throughput. The fol- lowing paper presents a paging batching scheme whereby increased throughput independent of the baud rate can be achieved. This is accomplished by examining the con- tent of the paging data and pager addresses and trans- mitting the information in a more efficient manner.

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INC. Technical Developments Volume 17 December 1992

COMMON PREFIX COMPRESSION PAGING (CP squared)

by Thaddeus Jakala

   Binary only numeric paging has attained large pop- ularity and widespread system implementation over the past few years. The industry trend is to increase the pag- ing information baud rate to allow for additional users and increase paging information throughput. The fol- lowing paper presents a paging batching scheme whereby increased throughput independent of the baud rate can be achieved. This is accomplished by examining the con- tent of the paging data and pager addresses and trans- mitting the information in a more efficient manner.

  Numeric paging is primarily used to transmit return phone numbers or an extension or a special code indi- cating the user to react accordingly. For these cases it will be shown that by grouping the data and pagers accordingly the common portion of the data for a large group of pagers can be compressed.

  Numeric paging is geographically dispersed over a certain area of coverage. Within that area of coverage, users will most likely be paged with return phone num- bers which will have an area code or 3 digit preiix from some limited set of area codes and prefutes which are specitic to the coverage area of service. The occasional cases of foreign area codes and prefixes unfamiliar to the coverage area will be neglected for the sake of this example. During peak paging hours, with a fully loaded system, it is highly likely that a large majority of the paging requests (actual data to be transmitted to a pager) can be grouped according to common area codes and prefutes. The special case of voice mail services or answering services will produce in most cases an entirely common 7 digit number or an extension ifit is specific to a large campus or facility. The discussion to follow introduces and explains a new batching scheme which takes advantage of common paging information to a group of pagers.

  The following background information is presented to aid in the discussion that follows. The following state- ments were derived from the Post Office Code Stand- ardization Advisory Group: Standard message formats for digital radiopaging, Autumn 1980.

34

Existing POCSAG batches paging information as follows:

BATCH = (synchronization codeword) (8 frames; 2 codewords each)

FRAMES = (address codeword) (message codeword) or

(address codeword) (address codeword) or (message codeword) (message codeword)

Or

(message codeword) (idle codeword) or (address codeword) (idle codeword) or (idle codeword) (idle codeword)

MESSAGE CODEWORD= can contain up to 5 char- acters from the numeric data set.

IDLE CODEWORD = Used to tilI any open frames

NUMERIC ONLY CHARACTER SET:

oooo=o OOOl=l 0010=2 0011=3 0100=4 0101=5 0110=6 0111=7 1000=8 1001=9 lOlO=SPARE lOll=U llOO=SPACE
llOl=- lllO=] llll=[

Explanation of the new batching method:

BATCH = (New Synchronization Code) (DATA) (8 frames; 2 codewords)

  The pager popu...