Browse Prior Art Database

IMPROVED PAGE RECEPTION IN OVERLAP AREAS FOR ALPHA PAGERS

IP.com Disclosure Number: IPCOM000009726D
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2002-Sep-13
Document File: 2 page(s) / 87K

Publishing Venue

Motorola

Related People

Karl R. Weiss: AUTHOR [+3]

Abstract

A roaming pager has to make a decision to switch from one channel to another channel when roaming. For example, a home channel may be pri- oritized and the pager has to determine when to switch to a roaming channel when roaming out of the coverage area of the home channel. This can be a problem, for example, if the pager switches too quickly (at 80% page sense level) as it may miss messages because page information is still being sent to the home channel and not to the roaming channel. Alternatively, if the pager switches too slowly (at 20% page sense level), then the pager may miss messages on the roaming channel because the home channel is still being.monitored even though the roaming channel has a strong signal strength.

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m M-LA Technical Developments

IMPROVED PAGE RECEPTION IN OVERLAP AREAS FOR ALPHA PAGERS

by Karl R. Weiss, Chua Yong Tong and Lee Huang Siong

  A roaming pager has to make a decision to switch from one channel to another channel when roaming. For example, a home channel may be pri- oritized and the pager has to determine when to switch to a roaming channel when roaming out of the coverage area of the home channel. This can be a problem, for example, if the pager switches too quickly (at 80% page sense level) as it may miss messages because page information is still being sent to the home channel and not to the roaming channel. Alternatively, if the pager switches too slowly (at 20% page sense level), then the pager may miss messages on the roaming channel because the home channel is still being.monitored even though the roaming channel has a strong signal strength.

  A way to solve this problem is to use multiple channel monitoring as shown in Figure 1 below. An issue with multiple channel monitoring is that mail- drop (or Common) addresses are not reliably received as shown.

  For alpha pagers not receiving maildrop mes- sages is a problem. A method to solve this problem when performing multiple channel monitoring is as follows:

  1. For every maildmp address, assign collapse cycle minus 1 more address that corresponds to every frame of the collapse cycle. Exclude the frame in the collapse cycle that already has this address as its base frame. A collapse cycle is 2 to the power of the collapse value. For example, the collapse value is 3 for a collapse cycle of 8.

  2. Assign the maildrop address to a pager that corresponds with t...