Access point power control
First Claim
Patent Images
1. A method of controlling a first basestation in a cellular wireless communications network comprising macrocell basestations and femtocell basestations, the method comprising:
- running a first set of algorithms at the first basestation at power up of the first basestation, said first set of algorithms selecting a carrier, a scrambling code, and maximum total downlink power for use by the first basestation in operation;
and, in operation of the first basestation;
obtaining measurements made by user equipment devices of signals from other basestations of said network;
determining, from said measurements made by the user equipment devices, whether there has been a change in interference in a femtocell layer or a macrocell layer requiring a new carrier or scrambling code to be reselected;
if there has been such a change in interference, rerunning, at the first basestation, the said first set of algorithms performed on power up for selection of a carrier, a scrambling code, and maximum total downlink power; and
if there has not been such a change in interference, setting a maximum value for a total transmit power of the first basestation based on said measurements made by user equipment devices and based on knowledge of round trip delays for a communications path between said first basestation and a user terminal within a target coverage area, and based on a predetermined maximum permitted round-trip delay.
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Abstract
There is described a method of controlling a basestation in a cellular wireless communications network, the method comprising, within the basestation, autonomously and dynamically adapting a maximum value for a total transmit power of the basestation, such that interference between the basestation and other access points in the vicinity is minimized.
75 Citations
32 Claims
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1. A method of controlling a first basestation in a cellular wireless communications network comprising macrocell basestations and femtocell basestations, the method comprising:
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running a first set of algorithms at the first basestation at power up of the first basestation, said first set of algorithms selecting a carrier, a scrambling code, and maximum total downlink power for use by the first basestation in operation; and, in operation of the first basestation; obtaining measurements made by user equipment devices of signals from other basestations of said network; determining, from said measurements made by the user equipment devices, whether there has been a change in interference in a femtocell layer or a macrocell layer requiring a new carrier or scrambling code to be reselected; if there has been such a change in interference, rerunning, at the first basestation, the said first set of algorithms performed on power up for selection of a carrier, a scrambling code, and maximum total downlink power; and if there has not been such a change in interference, setting a maximum value for a total transmit power of the first basestation based on said measurements made by user equipment devices and based on knowledge of round trip delays for a communications path between said first basestation and a user terminal within a target coverage area, and based on a predetermined maximum permitted round-trip delay. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A basestation adapted to perform a method of controlling the basestation in a cellular wireless communications network comprising macrocell basestations and femtocell basestations, the method comprising:
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running a first set of algorithms at the basestation at power up of the first basestation, said first set of algorithms selecting a carrier, a scrambling code, and maximum total downlink power for use by the first basestation in operation; and, in operation of the first basestation; obtaining measurements made by user equipment devices of signals from other basestations of said network; determining, from said measurements made by the user equipment devices, whether there has been a change in interference in a femtocell layer or a macrocell layer requiring a new carrier or scrambling code to be reselected; if there has been such a change in interference, rerunning, at the basestation, the said first set of algorithms performed on power up for selection of a carrier, a scrambling code, and maximum total downlink power; and if there has not been such a change in interference, setting a maximum value for a total transmit power of the basestation based on said measurements made by user equipment devices and based on knowledge of access attempts by non-permitted users. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of controlling a first basestation in a cellular wireless communications network comprising macrocell basestations and femtocell basestations, the method comprising:
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running a first set of algorithms at the first basestation at power up of the first basestation, said first set of algorithms selecting a carrier, a scrambling code, and maximum total downlink power for use by the first basestation in operation; and, in operation of the first basestation; obtaining measurements made by user equipment devices of signals from other basestations of said network; determining, from said measurements made by the user equipment devices, whether there has been a change in interference in a femtocell layer or a macrocell layer requiring a new carrier or scrambling code to be reselected; if there has been such a change in interference, rerunning, at the first basestation, the said first set of algorithms performed on power up for selection of a carrier, a scrambling code, and maximum total downlink power; and if there has not been such a change in interference, setting a maximum value for a total transmit power of the first basestation based on said measurements made by user equipment devices and based on knowledge of access attempts by non-permitted users.
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32. A basestation adapted to perform a method of controlling the basestation in a cellular wireless communications network comprising macrocell basestations and femtocell basestations, the method comprising:
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running a first set of algorithms at the basestation at power up of the first basestation, said first set of algorithms selecting a carrier, a scrambling code, and maximum total downlink power for use by the first basestation in operation; and, in operation of the first basestation; obtaining measurements made by user equipment devices of signals from other basestations of said network; determining, from said measurements made by the user equipment devices, whether there has been a change in interference in a femtocell layer or a macrocell layer requiring a new carrier or scrambling code to be reselected; if there has been such a change in interference, rerunning, at the basestation, the said first set of algorithms performed on power up for selection of a carrier, a scrambling code, and maximum total downlink power; and if there has not been such a change in interference, setting a maximum value for a total transmit power of the basestation based on said measurements made by user equipment devices and based on knowledge of round trip delays for a communications path between said basestation and a user terminal within a target coverage area, and based on a predetermined maximum permitted round-trip delay.
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Specification