Apparatus and method for improvement of transmission quality in a point-to-multipoint radio transmission system
First Claim
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).
3 Assignments
0 Petitions
Accused Products
Abstract
The radio transmission system includes at least one base station (BS1,BS2) and several participant stations (T111, . . . ,T222), in which the radio transmission range (Z1,Z2) belonging to each base station (BS1, BS2) is divided into several sectors (S11, . . . ,S22). The radio transmission system performs an automatic interference analysis in which a test channel is established between each participant station (T111, . . . ,T222) and all those sectors (S11, . . . ,S22) which cause interferences with the concerned participant station. A signal path-attenuation value is determined from the transmission power and received power of the test channel for each signal path between the participant stations (T111, . . . ,T222) and sectors (S11, . . . ,S22) and a carrier signal-to-noise ratio is determined for each participant station (T111, . . . ,T222) from all the signal path attenuation values contributing to it. When this carrier signal-to-noise ratio is below a predetermined threshold, a more robust type of modulation is used for the data signal transmission between the concerned participant station (T111, . . . ,T222) and the sector (S11, . . . ,S22) associated with it and/or the transmitted signal carrier is changed to another different frequency channel, for at least the sector (S11, . . . ,S22) which causes the greatest interference.
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Citations
12 Claims
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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:
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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). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for improving transmission quality in a point-to-multipoint radio transmission system, said apparatus 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 having an associated radio transmission range (Z1,Z2) comprising at least one sector (S11, . . . , S22) and said base station having a transmitter/receiver unit for each of said at least one sectors, 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 said at least one base station is located, and a central control unit (SE),
wherein said central control unit (SE) includes means for establishing 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) receiving the test channel; -
means for 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); means for determining a carrier signal-to-noise ratio for each of said participant stations (T111, . . . ,T222) from said signal path-attenuation for all of said signal paths contributing to said carrier signal-to-noise ratio; and means for changing a modulation of a data signal transmitted between one of said participant stations and said at least one sector (S11, . . . ,S22) associated therewith into a robust modulation and means for 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 the greatest amount of said interference for said one of said participant stations (T111, . . . ,T222), when the carrier signal-to-noise ratio is below a predetermined threshold (S1) for said one of said participant stations (T111, . . . , T222). - View Dependent Claims (12)
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Specification