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CONVENTIONAL LOCAL AREA RADIO COVERAGE SYSTEM

IP.com Disclosure Number: IPCOM000006193D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2001-Dec-12
Document File: 3 page(s) / 167K

Publishing Venue

Motorola

Related People

Karl Weiss: AUTHOR [+2]

Abstract

The system described here divides a conventional system coverage area into individual local areas that may each contain unique services. The local areas are created by placing medium to low power transmitters that send site ID information in a designated local area. These transmitters are arranged throughout the system in logical groupings to create the logical local area. The types of unique functionality associated with each local area may be contained within the sub- scriber unit or alternatively sent directly by the local transmitter. In the former case, the radio may contain a table of site ID's with their corresponding function in reprogrammable memory. In this way the services of each local area can be dynamically changed during radio operation.

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MOTOROLA INC. Technical Developments Volume 13 July 1991

CONVENTIONAL LOCAL AREA RADIO COVERAGE SYSTEM

by Karl Weiss and Dave Muri

INTRODUCTION

  The system described here divides a conventional system coverage area into individual local areas that may each contain unique services. The local areas are created by placing medium to low power transmitters that send site ID information in a designated local area. These transmitters are arranged throughout the system in logical groupings to create the logical local area. The types of unique functionality associated with each local area may be contained within the sub- scriber unit or alternatively sent directly by the local transmitter. In the former case, the radio may contain a table of site ID's with their corresponding function in reprogrammable memory. In this way the services of each local area can be dynamically changed during radio operation.

  A breakdown of a typical system employing this invention is shown in Figure 1. In this system, the subscriber unit operating on frequency Fl would peri- odically sample the site control frequency F2. Each local transmitter is sending out it's unique ID informa- tion on the frequency F2. The subscriber unit receives this site information in which it uses to perform unique services for that particular local area. If no information is received on site control frequency F2, the subscriber may default to its current programmed functionality.

POSSIBLE APPLICATIONS

  Listed below are possible services that this inven- tion makes realizable. Some of the services may require only the addition of the local area transmitters where other services may not. This implies that some of the services may be made available to certain sub- scribers in a system without modification of the hard- ware or firmware contained in the fixed equipment.

1. ENERGY MANAGEMENT

  A subscriber unit may use the site information to adjust the transmit power of the radio. In this case, the subscriber may have an internal table of site ID's and corresponding transmit power levels. When the sub- scriber senses that it is in one of the local areas, it uses the transmit power level for that particular local area. In this way, all the transmissions that originate from this local area will be at an optimal power setting. This system can be made to adapt to changing local environments. If the site ID information that the sub- scriber is operating on is sent to the central on normal transmissions, the central can monitor and track the receive signal strength originating from each local area. If for some reason the receive signal strength becomes unacceptable (either too low or high), the central can send out group wide information call to the subscribers instructing them to reprogram the power level for a particular local area.

  Another method for adaptively changing the power levels for each local area is to have the local area transmitter identify the appropriate RF power level informat...