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Apparatus and method for improvement of transmission quality in a point-to-multipoint radio transmission system

  • US 6,006,073 A
  • Filed: 11/10/1997
  • Issued: 12/21/1999
  • Est. Priority Date: 11/09/1996
  • Status: Expired due to Term
First Claim
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1. A method for improving transmission quality in a point-to-multipoint radio transmission system, said radio transmission system comprising at least one base station (BS1,BS2) and a plurality of participant stations (T111,T112,T121,T211,T221,T222), said at least one base station (BS1,BS2) having an associated radio transmission range (Z1,Z2) comprising at least one sector (S11, . . . , S22) and said at least one base station (BS1,BS2) having a transmitter/receiver unit for said at least one sector (S11, . . . ,S22), so that data transmission takes place between said at least one base station (BS1,BS2) and said participant stations (T111, . . . ,T222) located in the at least one sector (S11, . . . , S22) in which the at least one base station is located, said method comprising the steps of:

  • a) transmitting a test channel between each of said participant stations (T111, . . . ,T222) and said transmitter/receiver units of said at least one sector (S11, . . . ,S22) which cause interference with said participant station (T111, . . . ,T222) to which the test channel is transmitted;

    b) determining respective signal path-attenuation values from transmitted power and received power of said test channel for each signal path between the participant stations (T111, . . . ,T222) and the transmitter/receiver units of said at least one sector (S11, . . . , S22);

    c) determining a carrier signal-to-noise ratio for each of said participant stations (T111, . . . ,T222) from said signal path-attenuation values for all of said signal paths contributing to said carrier signal-to-noise ratio;

    d) when the carrier signal-to-noise ratio is below a predetermined threshold (S1) for one of said participant stations (T111, . . . , T222), changing a modulation of a data signal transmitted between said one of said participant stations and said transmitter/receiver units of said at least one sector (S11, . . . ,S22) in which said one of said participant station is located into a robust modulation and/or changing a transmission signal carrier for said one of said participant stations from one frequency channel to another frequency channel, at least in one of said at least one sector (S11, . . . ,S22) causing a largest amount of said interference for said one of said participant stations (T111, . . . ,T222).

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