Browse Prior Art Database

PASSIVE RESOURCE CONTROL FOR TRUNKED RADIO SYSTEMS

IP.com Disclosure Number: IPCOM000007557D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2002-Apr-05
Document File: 2 page(s) / 129K

Publishing Venue

Motorola

Related People

Leslie G. Gustafson, Jr.: AUTHOR [+2]

Abstract

Trunked control of voice resources is accom- plished by assigning one entity to one resource for the duration of one call. In such a system a resource is assigned for use to a requesting subscriber unit or group of units and will be deassigned when the trans- action (call) has been completed. This is a single transaction per request scenario. There exist other services, such as data, that cannot be efficiently han- dled in the same manner. Because data message dura- tion is short and the volume of transactions are high the overhead of a request and assignment per data transaction decreases a system's data throughput capability and can overburden the controller of the system.

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MmROLA Technical Developments

8

PASSIVE RESOURCE CONTROL FOR TRUNKED RADIO SYSTEMS

by Leslie G. Gustafson, Jr. and Herbert R. Wolf,

INTRODUCTION

  Trunked control of voice resources is accom- plished by assigning one entity to one resource for the duration of one call. In such a system a resource is assigned for use to a requesting subscriber unit or group of units and will be deassigned when the trans- action (call) has been completed. This is a single transaction per request scenario. There exist other services, such as data, that cannot be efficiently han- dled in the same manner. Because data message dura- tion is short and the volume of transactions are high the overhead of a request and assignment per data transaction decreases a system's data throughput capability and can overburden the controller of the system.

  The above problem is solved in trunked systems by allowing multiple subscriber units to respond to a single resource assignment. Contention for the resource is then handled via mechanisms imple- mented in the subscriber units.

  This article addresses the problem of control- ling the single request with multiple transaction sce- nario. Multi-user resources operate per a character- istic loading curve that shows an increase in resource efficiency as loading increases to a certain point. After that point the efficiency of the resource rapidly decreases with increasing load. It is the trunked con- troller's objective to allow a sufficient number ofunits to utilize the resource to maximize its eff'ciency yet prevent a detrimental overload ofthe resource.

BACKGROUND

For this discussion the examples used for the controlled service will be data.

  In order to gain high efficiencies for a service such as data the trunked 'system must steer multiple units to the same resource. Data transmissions tend to be of a short duration and the overhead of assigning each transaction its own resource creates a situa- tion where the resource is unusable for a large per- centage of time merely due to trunking control over- head. This differs from long voice transaction where the trunking control overhead becomes an insignif- icant portion ofthe total resource utilization.

  When assigned to a 'channel for data transmis- sion purposes, multiple subscriber units must con- tend for the resource. It IS the trunking controller's responsibility to prevent r& overload ofusers assigned to any one resource. I

THE NEW METHOD

  The method of multitile transaction resource con- trol utilizes a statistical approach to the problem of channel management. Srnce the loading efficiency profile of a resource cant be predicted this informa- tion can be utilized to control it.

  Figure 1 illustrates the channel control mecha- nism in action. Control channel assignment activity shows that there is never more than one assigned data resource advertisedyat any one time. The chan- nel load profile depicts the increase...