Browse Prior Art Database

PREAMBLE TECHNIQUE FOR INFORMATION SERVICES

IP.com Disclosure Number: IPCOM000006706D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2002-Jan-24
Document File: 2 page(s) / 100K

Publishing Venue

Motorola

Related People

Gregory 0. Snowden: AUTHOR [+3]

Abstract

Information service systems can be defmed as pag- ing systems in which many of the paging receivers have access to one or more information data streams which are transmitted at predetermined time intervals. An exam- ple currently being practiced is the periodic transmis- sion of up to date sports scores. Each pager in the group is typically programmed to respond to both an informa- tion service address and at least one personal address.

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MO'lrOROLA INC. Technical Developments Volume 17 December 1992

PREAMBLE TECHNIQUE FOR INFORMATION SERVICES

by Gregory 0. Snowden, Clifford E. Barrett III and Fernando Gomez

  Information service systems can be defmed as pag- ing systems in which many of the paging receivers have access to one or more information data streams which are transmitted at predetermined time intervals. An exam- ple currently being practiced is the periodic transmis- sion of up to date sports scores. Each pager in the group is typically programmed to respond to both an informa- tion service address and at least one personal address.

  In GSC systems the paging traffic is divided into up to 10 preamble groups for battery saving purposes. The preamble consists of 28 bits of comma preceding 18 repeats of one of 10 unique (23, 12) codewords and is transmitted just prior to a group of pages. For a given pager all addresses are assigned to a single preamble. If information services are included and the normal method of preamble assignment is used all information service pagers must, have both their personal and information service address in the same preamble. This results in the following undesirable characteristics:

  a) When the number of information service pagers is large, crowding of one preamble occurs which cre- ates pager battery saver inefficiency.

   b) If, in attempting to improve battery saving, the information service data is duplicated on multiple pre- ambles, system throughput suffers.

  c) Pagers currently in service may wish to add the information service capabiity. This may result in the inconvenience of changing their personal address (as well as phone number) to one of the information service pre- ambles. This may also result in their being eliminated 6om a group call group which was operating on the group call preamble.

  As a solution it is possible to dedicate at least one preamble exclusively for the transmission of informa- tion services data. The paging receiver can be designed to respond to either of at least two preambles, one pre-

amble for personal addresses and normal group call and the other preamble for information services. Each time the pager strobes on to search for preamble it examines th...