Browse Prior Art Database

RECEIVED SIGNAL STRENGTH INDICATOR WITH SYSTEM SEARCH AND LOCK

IP.com Disclosure Number: IPCOM000008714D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2002-Jul-04
Document File: 1 page(s) / 66K

Publishing Venue

Motorola

Related People

Motty Shor: AUTHOR [+2]

Abstract

The use of RSSI in System Search and Lock (SSL) will allow the subscriber unit to start looking for a new site when the signal strength is below a predefined threshold and to lock into the best available site.

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MOTOROLA Technical Developments

RECEIVED SIGNAL STRENGTH INDICATOR WITH SYSTEM SEARCH AND LOCK

by Motty Shor and Eytan Ramon

ABSTRACT

  The use of RSSI in System Search and Lock (SSL) will allow the subscriber unit to start looking for a new site when the signal strength is below a predefined threshold and to lock into the best available site.

INTRODUCTION

This paper describes improvements to System Search and Lock (SSL) algorithms.

  System Search and Lock (SSL) is a common feature in existing trunked communication systems. When a subscriber unit in a mobile communication system is locked to a trunking site, and the control channel is lost, the subscriber unit can move automat- ically to another trunking site and lock to that site.

  New trunked communication systems are arranged as a 'smartzone' network which allows the subscriber unit advanced network features like call continuation, wide voice dispatch calls, best site selecrion, etc.

  The main trigger for site switching in a smart- zone network is the Received Signal Strength Indicator (RSSI). By monitoring the RSSI, the subscriber unit 'knows' ahead of time when to move to another site, and therefore, all the advanced features are available.

  Most of the new subscriber units are capable of working in a smartzone network and are equipped with the RSSI Hardware.

These subscribers, such as LCS2000, also work

with 'older' trunking sites that are not connected amongst themselves to provide a smartzone network. Howev...