Communication system
First Claim
1. A communication system comprising a source apparatus, an intermediate apparatus and a base station, the source apparatus being operable to transmit a communication signal, via the or each intermediate apparatus, to the base station, the base station comprising an indicator derivator operable to derive one or more indicators of the quality of a communication signal received at the base station, and wherein the communication system further comprises:
- i) a controller provided in the base station;
ii) an indicator deviator detector operable to detect a change in one said indicator derived by the base station from a desired value;
iii) a determination unit operable, following the detection of such a change, to determine a required change in the transmit power of the intermediate apparatus that will tend to bring said indicator to said desired value, wherein said determination unit further comprises a request transmitter operable to transmit a request for a change in the transmit power of the intermediate apparatus to the controller.
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Accused Products
Abstract
The present application relates to a wireless communication system and related methods and apparatuses for transmitting a signal from a source apparatus to a destination apparatus, via at least one intermediate apparatus. In particular, the present invention relates to techniques which seek to improve the throughput of data in multi-hop communication systems.
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Citations
41 Claims
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1. A communication system comprising a source apparatus, an intermediate apparatus and a base station, the source apparatus being operable to transmit a communication signal, via the or each intermediate apparatus, to the base station, the base station comprising an indicator derivator operable to derive one or more indicators of the quality of a communication signal received at the base station, and wherein the communication system further comprises:
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i) a controller provided in the base station;
ii) an indicator deviator detector operable to detect a change in one said indicator derived by the base station from a desired value;
iii) a determination unit operable, following the detection of such a change, to determine a required change in the transmit power of the intermediate apparatus that will tend to bring said indicator to said desired value, wherein said determination unit further comprises a request transmitter operable to transmit a request for a change in the transmit power of the intermediate apparatus to the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 32, 41)
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21. A communication system comprising a source apparatus, an intermediate apparatus and a base station, the source apparatus being operable to transmit a communication signal, via the or each intermediate apparatus, to the base station, the wherein each of the base station and the intermediate apparatus comprise:
- an indicator derivator operable to derive one or more indicators of the quality of a communication signal received at the base station or the intermediate apparatus respectively, the communication system further comprising;
i) an imbalance detector operable to detect an imbalance between one said indicator derived by the base station and one said indicator derived intermediate apparatus; and
ii) a determination unit operable, following detection of such an imbalance by said imbalance detector, to determine a required change in the transmit power of the source apparatus that will tend to reduce such an imbalance; and
iii) a controller provided in said base station and operable, following determination of said change, to issue a command to said source apparatus commanding a change in the transmit power of the source apparatus. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
- an indicator derivator operable to derive one or more indicators of the quality of a communication signal received at the base station or the intermediate apparatus respectively, the communication system further comprising;
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33. A method of controlling the transmit power of an intermediate apparatus in a multi-hop communication system, the communication system comprising a source apparatus, a base station and at least one intermediate apparatus, the source apparatus being operable to transmit a communication signal, via the or each intermediate apparatus, to the base station, the method comprising the steps of:
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i) deriving, at the base station, one or more indicators of a quality of a communication signal received at the base station;
ii) detecting a deviation in the, or one of the, indicators derived by the base station from a desired value; and
iii) determining a required change in the transmit power of the intermediate apparatus that will tend to bring said indicator to said desired value.
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34. A method of controlling the transmit power of a source apparatus in a multi-hop communication system, the multi-hop communication system comprising a source apparatus, a base station and at least one intermediate apparatus, the source apparatus being operable to transmit a communication signal, via the or each intermediate apparatus, to the base station, the method comprising the steps of:
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i) deriving, at each of the base station and the intermediate apparatus, one or more indicator(s) of a quality of a communication signal received at the base station, or at the intermediate apparatus, respectively;
ii) detecting an imbalance between one said indicator derived by the base station and one said indicator derived by the intermediate apparatus;
iii) determining a required change in the transmit power of the source apparatus that will tend to reduce such an imbalance; and
iv) issuing a command to said source apparatus commanding a change in the transmit power of said source apparatus.
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35. A base station operable to receive, via one or more intermediate apparatus a communication signal from a source apparatus, the base station comprising:
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i) an indicator derivator operable to derive one or more indicators of a quality of a communication signal received at the base station;
ii) an indicator deviation detector, operable to detect a deviation in the, or one of the, indicators derived by the indicator derivator;
from a desired value;
iii) a determination unit operable, following detection of such a change by said indicator deviation detector, to determine a required change in the transmit power of the intermediate apparatus that will tend to bring the said indicator towards said desired value, said determination unit being operable to transmit a request for a change in the transmit power of the intermediate apparatus to said controller;
iv) a controller, operable to receive such a request from said determination unit. - View Dependent Claims (36, 37)
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38. A base station operable to receive, via one or more intermediate apparatus, a communication signal from a source apparatus, the base station comprising:
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i) an indicator derivator operable to derive one or more indicator of the quality of a communication signal received at the base station;
ii) an indicator receiver operable to receive one or more indicator from the intermediate apparatus, wherein the or each indicator is indicative of the quality of a communication signal received at the intermediate apparatus;
iii) an imbalance detector operable to detect an imbalance between an indicator derived by the base station and an indicator received from the intermediate apparatus; and
iv) a determination unit operable, following detection of such an imbalance by said imbalance detector, to determine a required change in the transmit power of the source apparatus that will tend to reduce such an imbalance; and
v) a controller operable, following determination of said change, to issue a command to said source apparatus commanding a change in the transmit power of said source apparatus. - View Dependent Claims (39, 40)
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Specification