Browse Prior Art Database

AUTOMATIC GAIN CALL RECEPTION IN TRANSMITTER STEERING SYSTEM

IP.com Disclosure Number: IPCOM000007028D
Original Publication Date: 1993-Oct-01
Included in the Prior Art Database: 2002-Feb-19
Document File: 2 page(s) / 112K

Publishing Venue

Motorola

Related People

Uwe Haase: AUTHOR

Abstract

Automatic call-and message repetition of multiparty- and collective calls for multi-transmitter fixed station systems with individually connected transmitters (transmitter control).

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MO7WROLA INC. Technical Developments Volume20

October 1993

AUTOMATIC GAIN CALL RECEPTION :IN TRANSMITTER STEERING SYSTEM

by Uwe Haase

PRINCIPLE

  Automatic call-and message repetition of multiparty- and collective calls for multi-transmitter fixed station systems with individually connected transmitters (transmitter control).

  Maximum possible operational simplification in the case of multiparty- and collective- calls to the level ofan individual-transmitter system.

once consecutively via all the transmitters. The recep tion of an acknowledgement from the mobile device prematurely halts the continued call transmission. In dependence upon the receiving path for the recep- tion of the acknowledgement, the associated trans- mitter is switched on for the following conversa- tion. The mobile subscribers do not give an acknowledgement however in the case of multiparty- and collective calls as, due to superimposition, simultaneously transmitted acknowledgements would result in a frequency mixture which in any case would be unusable.

DEFINITION DESCRIPTION OF PROBLEM

  With a predetermined transmitting power and antenna height, the radio range of a radio system can be increased only by multiplying the fixed radio stations. Simple parallel connection of the trans- mitted- and received signals leads to unacceptable disturbances, however, due to the superimposition of the signals. Therefore in such systems the signals are compared at the receiving end and only one receiving signal path is switched through. To obtain adequate field strengths in the entire supply zone, the intervals between the transmitter locations must be so small that the ranges ofthe fixed station trans- mitters overlap. However, in these overlap zones disturbance-free mobile reception is possible only

if, in the case of the simultaneous operation of the transmitters, the transmitted signals are virtually identical (using simultaneous broadcasting), or by switching on the transmitters individually with an overlapping radio range (example: (individual) trans- mitter control).

  An essential disadvantage of systems with a trans- mitter control facility consists in the complicated operation ofthe system in the event of a multiparty- or collective call to mobile subscribers in different transmitter supply zones: Following the initiation of such a call, which firstly is transmitted only via one transmitter, a message can then be given. In order to transmit the message in the entire radio supply z...