Browse Prior Art Database

GROUP CALLS ON VARIABLE BANDWIDTH CHANNELS, DYNAMIC ASSIGNMENT OF CHANNEL TYPE

IP.com Disclosure Number: IPCOM000009780D
Original Publication Date: 2000-May-01
Included in the Prior Art Database: 2002-Sep-18
Document File: 1 page(s) / 68K

Publishing Venue

Motorola

Related People

Kamala Urs: AUTHOR [+3]

Abstract

As dispatch systems evolve, issues arise with multiple generations of subscriber units needing to operate on a single system. These subscriber units may have different requirements for bandwidth, modulation, etc. Group call becomes a particular issue, since all subscribers participating in a group call within a cell share a single channel. The system may not know what subscriber units are participating in a group call, since only one subscriber unit in any cell sends in a page response. The other subscriber units join the group call but do not signal their intent to do so in order to optimize the system.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 50% of the total text.

MOTOROLA

Technical Developments

GROUP CALLS ON VARIABLE BANDWIDTH CHANNELS, DYNAMIC ASSIGNMENT OF CHANNEL TYPE

by Kamala Urs, Valy Lev and Arieh Cimet

As dispatch systems evolve, issues arise with multiple generations of subscriber units needing to operate on a single system. These subscriber units may have different requirements for bandwidth, modulation, etc. Group call becomes a particular issue, since all subscribers participating in a group call within a cell share a single channel. The system may not know what subscriber units are participating in a group call, since only one subscriber unit in any cell sends in a page response. The other subscriber units join the group call but do not signal their intent to do so in order to optimize the system.

How can we accommodate the varying requirements for multiple generation subscriber units if we are not sure of which subscriber units share the channel? This article describes an implementation providing the capability to recognize multiple generations or types of subscriber units and provide the necessary resources to complete the group call.

When a group is paged, we will allow more than one subscriber unit to respond.

. Legacy subscriber umts will respond as they do today; once a legacy responds to the page with a page response, no more legacy units will respond.

. Future generation subscriber units will respond in the same manner; the first subscriber unit of any particular type to respond will send in a special page response indicating its ..class"~ once that unit has responded, no more units of that type/class will respond. Note...