Browse Prior Art Database

FAST ACCESS DIGITAL TRUNKING METHOD

IP.com Disclosure Number: IPCOM000007009D
Original Publication Date: 1993-Oct-01
Included in the Prior Art Database: 2002-Feb-18
Document File: 2 page(s) / 104K

Publishing Venue

Motorola

Related People

Gil Santos: AUTHOR

Abstract

The currently proposed MIRS digital trunking system uses the message set shown in Figure 1. Arrows from the top indicate a'subscriber initiated message delivered through the infrastructure equip- ment to the digital trunking controller. Arrows from the bottom indicate messages originating from the trunking controller. Also, note that the horizontal distance is proportional to the processing time. This call set up scenario uses separate paging and group call grant message sets. It also delays the grant until a certain number of pages are received, or the page response timer expires. As you can see a large amount of time is spent identifying and sending page requests to trunking location areas, and waiting for a response.

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INC. Technical Developments Volume 20 October 1993

FAST ACCESS DIGITAL TRUNKING METHOD

by Gil Santos

BACKGROUND

  The currently proposed MIRS digital trunking system uses the message set shown in Figure 1. Arrows from the top indicate a'subscriber initiated message delivered through the infrastructure equip- ment to the digital trunking controller. Arrows from the bottom indicate messages originating from the trunking controller. Also, note that the horizontal distance is proportional to the processing time. This call set up scenario uses separate paging and group call grant message sets. It also delays the grant until a certain number of pages are received, or the page response timer expires. As you can see a large amount of time is spent identifying and sending page requests to trunking location areas, and waiting for a response.

registration messages. To start the process, a group call request is generated by a subscriber unit. This request is forwarded to the digital trunking control- ler. The controller sends a group call start message containing the group call ID to all EBTSs in the location areas. EBTSs check their group call list to see if they contain members with matching IDS. If not, no further messages,or processing is required. If they do contain members, EBTS sends group call BOT (begin transmission) message to the sectors that are expected to contain target members and instructs the subscriber units to move to their traffic channel assignment. A BOT acknowledgement mes- sage is now required horn any subscriber in that sector before a traffic channel is actually assigned by the EBTS. If an ACK BOT is heard by the EBlS, then the traffic channel is assigned, and a group call BOT message is sent to the trunking controller who sets up the voice routing, and the call proceeds. If no BOT ACK is heard from the sector, then the EBTS does not allocate a traffic channel, and does not return a group call BOT message to the trunking controller. Only EBTSs returning a group call BOT will be...