Browse Prior Art Database

PAGER WITH OUT-OF-RANGE INDICATOR

IP.com Disclosure Number: IPCOM000005520D
Original Publication Date: 1984-Apr-01
Included in the Prior Art Database: 2001-Oct-11
Document File: 2 page(s) / 71K

Publishing Venue

Motorola

Related People

Marie Shanley: AUTHOR

Abstract

A typical pager only notifies the user when a page has been successfully decoded. If no page alerts are given, the user has no way of knowing whether his pager is actually receiving signals from the transmitter. The pager needs: a. a means of detecting that it is out bf transmitter range or that the transmitter is down. b. a means of conveying this information to the user. c. a means of notifying the user that the pager is again receiving data.

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Volume4 April 1984

PAGER WITH OUT-OF-RANGE INDICATOR

by Marie Shanley

   A typical pager only notifies the user when a page has been successfully decoded. If no page alerts are given, the user has no way of knowing whether his pager is actually receiving signals from the transmitter. The pager needs:

a. a means of detecting that it is out bf transmitter range or that the transmitter is down.
b. a means of conveying this information to the user.
c. a means of notifying the user that the pager is again receiving data.

In a display pager items (b) and (c) can be implemented by writing a unique display pattern in standby mode to indicate the out-of-range condition. Item (a) is implemented by a software algorithm.

SOFTWARE ALGORITHM

    The algorithm, flow charted in Figure 1, can be applied to any preamble-based battery-saver coding scheme such as Golay Sequential Code. A la-bit counter is maintained in the microcomputer RAM. The counter is initialized to the maximum timer value(e.g. 15 minutes) on power-up and again every time the preamble is detected. Each.time the preamble search fails (every 1.38 seconds for a GSC pager), the counter isdecremented. When it reacheszero, the standby display ischanged from its normal pattern to an out-of-range indication. A RAM flag ORDISP is set to indicate that this display has been written. The counter is then re-initialized. Later, when the preamble is again detected, ORDISP is checked. If set, the display is changed back to its normal...