Browse Prior Art Database

FAST CALL HAND-OFF IN A WIDE AREA TRUNKED COMMUNICATION SYSTEM

IP.com Disclosure Number: IPCOM000007320D
Original Publication Date: 1994-Oct-01
Included in the Prior Art Database: 2002-Mar-14
Document File: 2 page(s) / 85K

Publishing Venue

Motorola

Related People

Dan Pautler: AUTHOR [+2]

Abstract

On today's Trunked SmartZone system, it takes a long time (at least 2 seconds) for a radio subscriber unit to switch from one remote site to another remote site for an active halfduplex dispatch call.

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MO7-OROLA Technical Developments Volume 23 October 1994

FAST CALL HAND-OFF IN A WIDE AR=

TRUNKED COMMUNICATION SYSTEM

by Dan Pautler and William Felderman

  On today's Trunked SmartZone system, it takes a long time (at least 2 seconds) for a radio subscriber unit to switch from one remote site to another remote site for an active halfduplex dispatch call.

The following describes the procedure to expe- dite the call hand-off

  Under the system contemplated, each subscriber unit ranks the control channels of adjacent sites prior to starting a conversation on a voice channel. Each site transmits, as embedded signaling over its voice channels, information relating to available voice chan- nels on adjacent sites, along with the identification of the adjacent sites' control channels. Of course, this information only appears when a member of the subscriber's talk group is affiliated with an adja- cent site. When a subscriber unit involved in a con- versation detects loss of signal or frame sync or the signal has reached a low signal threshold, instead of switching to an adjacent site control channel, the subscriber unit checks its list ofranked adjacent sites and will go directly to the highest ranked assigned voice channel. Since the subscriber is switching to a voice channel already assigned to a talk group mem- ber, the subscriber may continue to participate in the ongoing conversation using the voice channel

from the new site. When the call is completed, the radio can then affiliate with this...