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Browse Prior Art Database

TRUNKED ASTRO DATA CHANNEL CYCLIC LOAD BALANCING

IP.com Disclosure Number: IPCOM000007625D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2002-Apr-10
Document File: 1 page(s) / 70K

Publishing Venue

Motorola

Related People

Ray Van Tassle: AUTHOR

Abstract

In a trunked voice/data system, when the data traffic load at a site is too high for one channel, additional data channels may be brought into serv- ice. When there is more than one data channel active, it is necessary to balance the load between chan- nels, as (by definition) the load is more than a sin- gle channel can sustain.

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MmROLA Technical Developments

TRUNKED ASTRO DATA CHANNEL CYCLIC LOAD BALANCING

by Ray Van Tassle

  In a trunked voice/data system, when the data traffic load at a site is too high for one channel, additional data channels may be brought into serv- ice. When there is more than one data channel active, it is necessary to balance the load between chan- nels, as (by definition) the load is more than a sin- gle channel can sustain.

  In the system operational mode under discus- sion, more than one channel is in data mode. When a mobile data radio Subscriber Unit (SU) wants to send an inbound data message, it does not request a channel, but rather goes directly to the channel that is being "advertised" in a "data-channel-grant" Out- bound Status Word (DGG-OSW) on the control channel.

  A previous attempted solution was for the cen- tral controller to monitor the actual or imputed load on the channel being advertised, and when it's load gets high enough, switch to advertising a different data channel. This does NOT solve the problem, because the central controller cannot react fast enough to keep the load balanced. In operation, all the new inbound data traffic will be directed to one channel (the one being advertised), rather than split among all the channels. At any short instance, the

system will have one data channel which is heavily overloaded, and one or more others which are not loaded at all. The overall system thoughput will col- lapse disasterously, as a heavily overloaded channel can pass virtually no traffic, and the unloaded...