Browse Prior Art Database

INTELLIGENT "DUPLICATE MESSAGE" PROCESSING

IP.com Disclosure Number: IPCOM000006022D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2001-Nov-27
Document File: 2 page(s) / 122K

Publishing Venue

Motorola

Related People

William J. Kuznicki: AUTHOR [+3]

Abstract

The present portfolio of paging receivers which offer displayed messaging have as one of their optional features the ability to detect and indicate to the user the receipt of a duplicate massage. The pager's decoding circuitry analyzes the incoming massaging and determines that this message is identical in length and content to one received previously. Unfortunately, the user of the pager through no fault of their own may have lost track of the time frame associated with receiving the initial massage and can be confused by the relative importance of this newly received "duplicate massage" page. Display paging racaiverS with multiple message slots often provide message indicators starting on the left side of the display, and filling to the right. Usually, the right most massage indicator represents the most recently received massage. This positional reference to massage order is lost when duplicate massage detection operates continuously. The intent of this document is to describe possible solutions to time referenced message processing by the pager.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 50% of the total text.

Page 1 of 2

0 M MmROLA

Technical Developments Volume 11 October 1990

INTELLIGENT "DUPLICATE MESSAGE" PROCESSING

by William J. Kuznicki, David Ft. P&eye and David E Willard

   The present portfolio of paging receivers which offer displayed messaging have as one of their optional features the ability to detect and indicate to the user the receipt of a duplicate massage. The pager's decoding circuitry analyzes the incoming massaging and determines that this message is identical in length and content to one received previously. Unfortunately, the user of the pager through no fault of their own may have lost track of the time frame associated with receiving the initial massage and can be confused by the relative importance of this newly received "duplicate massage" page. Display paging racaiverS with multiple message slots often provide message indicators starting on the left side of the display, and filling to the right. Usually, the right most massage indicator represents the most recently received massage. This positional reference to massage order is lost when duplicate massage detection operates continuously. The intent of this document is to describe possible solutions to time referenced message processing by the pager.

We will describe two present day signalling formats that can be used to secure a time reference so that the pager's decoding circuitry can count elapsed time via the ongoing signalling events present on the channel transmissions.

   A. Golay Sequential Code - per Figure 1, the start code after preamble can be used as a reference point. In con- tinuous transmissions the start coda can be sent as often as once every 28.85 seconds or lass. If 18 of these "flags" ware received during the pager's active channel monitoring cycles, a total of - 462 seconds will have elapsed, a time span approaching 8 minutes. This length of time is sufficient to consider any new message of the same content to no longer be noted as a duplicate message. We have, therefore, created a means to recognize an elapsed time period of sufficient length to abort further duplicate message detection on a specific preceding message or for any subsequent paging event(s). If channel traffic is more sporadic than continuous, this time span period can vary and be shorter or longer. In either case the "flag" triggering the time indexing circuit will still act to eliminate the duplicate message indication.

   B. 512 POCSAG- per Figure 2, the frame sync code word after the preamble and preceding the batch code words is present at fairly regular time intervals. Should wntinuous transmissions be sent, this preamble will be injected at regular intervals to allow channel acquisition to pagers which do not acquire on data. Most existing systems pr...