Browse Prior Art Database

Method to manage co-channel interference in trunking systems from known sources

IP.com Disclosure Number: IPCOM000007455D
Original Publication Date: 2002-Mar-27
Included in the Prior Art Database: 2002-Mar-27
Document File: 3 page(s) / 41K

Publishing Venue

Motorola

Related People

By Jeff Frager: AUTHOR

Abstract

In Motorola trunking systems today, the presence of interference at a base radio (BR) receiver is reported within the system infrastructure. The channel with the interference present will not be assigned for communications using an algorithm based on the signal level and the length of time the interference is present. Potentially, the interfered channel may not be available as a channel resource for a lengthy period of time. Also, with radio spectrum resources becoming scarcer over time, the pressure to allow frequency reuse within a trading area increases.

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In Motorola trunking systems today, the presence of interference at a base radio (BR) receiver is reported within the system infrastructure. The channel with the interference present will not be assigned for communications using an algorithm based on the signal level and the length of time the interference is present. Potentially, the interfered channel may not be available as a channel resource for a lengthy period of time. Also, with radio spectrum resources becoming scarcer over time, the pressure to allow frequency reuse within a trading area increases.

This paper proposes a new method to manage channel resources in the presence of an interference signal from a known source.

In today’s Motorola trunking systems, receive signal strength indication (RSSI) threshold and timer algorithms are used to determine whether a channel will be removed from service due to interference. This method provides good interference management from unknown sources. But at the same time, this method limits the ability to manage interference if a known interferer was permitted.

This new method utilizes existing on channel signaling from a subscriber unit (SU) and the RSSI level received at the BR receiver. The BR will report to the site controller (SC) the network identifier (NID) from the SU and the RSSI level. The SC will determine from configurable information if the interference signal is from a known interferer from different trunked system. Based on the SC configuration information, which...