Browse Prior Art Database

COMPLETE SCAN CAPABILITIES ON REMOTE OR SPARSELY POPULATED SITES

IP.com Disclosure Number: IPCOM000007745D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2002-Apr-18
Document File: 3 page(s) / 125K

Publishing Venue

Motorola

Related People

Gary Gutknecht: AUTHOR

Abstract

Scan is a feature that allows a radio user to mon- itor activity on more than just his or her selected group. In general, a radio keeps a list of groups, or scan members, that it uses while in scan. The scan feature exists on different types of systems. For con- ventional systems, scanning means checking the he- quencies of scan list members for call activity in progress. For trunked systems, scanning means monitoring a control channel for channel grants. These grants are then compared against its scan list and ifa match is found, the radio moves to the voice channel to monitor the group's call.

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M-ROLA Technical Developments

COMPLIXE SCAN CAPABILITIES ON REMOTE OR SPARSELY POPULATED SITES

by Gary Gutknecht

improve the scan feature on wide area trunked sys- tems is introduced here. Each site in a centrally con- trolled trunked system frequently broadcasts status information about itself Part ofthis status informa- tion could be allocated to show whether the site was operating as a normal site or as a scan site. If the site is operating as a normal site and a radio within that site enters or is in scan, the radio could initiate a transmission to the FNE indicating that the site should become a scan site (see Figure 1). When the radio which made the scan site request exists scan, powers off, affiliates to another site, or atIer a certain period oftime, the scan site can tran- sition back to a normal site. The radios remaining at that site will then be responsible for updating the scan status as necessary.

  Once a site is operating as a scan site, it is respon- sible for broadcasting information about all group calls which are active on other sites in the system but for which no radio users are afriliated to on the scan site. Radios in scan mode can use this infor- mation about active group calls on other sites to check against their scan lists. If a match is found between one of these groups and a member of a radio's scan list, the radio can initiate a transmis- sion to the FNE indicating that resources should be allocated for that group in the scan site. The FNE can then allocate a channel for the requested group ; call if resources permit (see Figure 2).

BACKGROUND:

  Scan is a feature that allows a radio user to mon- itor activity on more than just his or her selected group. In general, a radio keeps a list of groups, or scan members, that it uses while in scan. The scan feature exists on different types of systems. For con- ventional systems, scanning means checking the he- quencies of scan list members for call activity in progress. For trunked systems, scanning means monitoring a control channel for channel grants. These grants are then compared against its scan list and ifa match is found, the radio moves to the voice channel to monitor the group's call.

PROBLEM:

  As the demand for trunked systems evolved into a demand for wide area trunked systems with many users, the effectiveness of scan as a feature became diminished. In many current mobile dispatch wide area communication systems (such as Smart-Zone), the allocation ofchannel resources...