Method and system for channel allocation using power control and mobile-assisted handover measurements
First Claim
1. A method for assigning uplink radio channels in a radio communication system comprising the steps of:
- (a) measuring, in a mobile station, received signal strength indications (RSSIs) of control signals broadcast from at least one base station;
(b) determining a path loss between the mobile station and the at least one base station using the RSSI measurements;
(c) measuring, in the at least one base station, an RSSI of interference signals on a plurality of available traffic channels;
(d) determining transmit powers required for the mobile station to produce a signal on each of the plurality of available traffic channels at the at least one base station, wherein a strength of said signal is a predetermined level above a corresponding RSSI interference level measured on a traffic channel taking into consideration the path loss; and
(e) assigning one of said plurality of available traffic channels as an uplink channel based on said determined transmit powers.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and system for the adaptive allocation of channels within a radio communication system, specifically a cellular network, is presented. The allocation method takes advantage of measurements made by the mobile radiotelephone and allocates channels based on the carrier to interference ratio. Using adaptive power control, consideration is given to maintaining an acceptable carrier to interference ratio while at the same time minimizing transmit power. Exemplary embodiments consider independent allocation of the uplink and downlink as well as independent determination of the uplink and downlink power levels. Other exemplary embodiments also give consideration to an efficient method for slot allocation in a TDMA communication system.
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Citations
32 Claims
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1. A method for assigning uplink radio channels in a radio communication system comprising the steps of:
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(a) measuring, in a mobile station, received signal strength indications (RSSIs) of control signals broadcast from at least one base station; (b) determining a path loss between the mobile station and the at least one base station using the RSSI measurements; (c) measuring, in the at least one base station, an RSSI of interference signals on a plurality of available traffic channels; (d) determining transmit powers required for the mobile station to produce a signal on each of the plurality of available traffic channels at the at least one base station, wherein a strength of said signal is a predetermined level above a corresponding RSSI interference level measured on a traffic channel taking into consideration the path loss; and (e) assigning one of said plurality of available traffic channels as an uplink channel based on said determined transmit powers. - View Dependent Claims (2)
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3. A method for assigning downlink radio channels in a radio communication system comprising the steps of:
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(a) measuring, in a mobile station, received signal strength indications (RSSIs) of control signals broadcast from at least one base station; (b) determining a path loss between the mobile station and the at least one base station using the RSSI measurements; (c) measuring, in the mobile station, an RSSI of interference signals on a plurality of available traffic channels; (d) determining transmit powers required of the at least one base station to produce, at the mobile station, a signal on each of the plurality of available traffic channels having a signal strength which is a predetermined level above a corresponding RSSI interference level measured on a traffic channel taking into consideration the path loss; and (e) assigning one of said plurality of available traffic channels as a downlink channel based on said determined transmit powers. - View Dependent Claims (4)
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5. In a radio communication system wherein uplink and downlink channels are separated by a predetermined frequency offset, a method for assigning radio channels comprising the steps of:
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(a) measuring, in a mobile station, received signal strength indications (RSSIs) of control signals broadcast from at least one base station; (b) determining a path loss between the mobile station and the at least one base station using the RSSI measurements; (c) measuring, in the at least one base station, first RSSIs of interference signals on a plurality of available traffic channels; (d) determining transmit powers required for the mobile station to produce a signal on each of the plurality of available traffic channels at the at least one base station, wherein a strength of said produced signal is a predetermined level above a corresponding first RSSI interference level measured on a traffic channel, taking into consideration the path loss; (e) measuring, in the mobile station, second RSSIs of interference signals on each of said plurality of available traffic channels; (f) determining transmit powers required of the at least one base station to produce, at the mobile station, a signal on each of the plurality of available traffic channels having a signal strength which is a predetermined level above a corresponding second RSSI interference level measured on a traffic channel, taking into consideration the path loss; and (g) assigning a radio channel based on at least one of said determined transmit powers required of the mobile station and said determined transmit powers required of the at least one base station. - View Dependent Claims (6, 7, 8)
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9. A method for assigning downlink radio channels in a radio communication system comprising the steps of:
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(a) measuring, in a mobile station, received signal strength indications (RSSIs) of control signals broadcast from at least one base station; (b) determining a path loss between the mobile station and the at least one base station using the RSSI measurements; (c) predicting RSSIs of interference signals emanating from said at least one base station on each of a plurality of available traffic channels; (d) determining transmit powers required of the at least one base station to produce, at the mobile station, a signal on each of the plurality of available traffic channels having a signal strength which is a predetermined levels above a corresponding RSSI interference level measured on that traffic channel, taking into consideration the path loss; and (e) assigning a channel based on said determined transmit powers. - View Dependent Claims (10)
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11. A method for assigning downlink radio channels in a radio communication system comprising the steps of:
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(a) measuring, in a mobile station, first received signal strength indications (RSSIs) of control signals broadcast from a first base station; (b) determining a first path loss value between the mobile station and the first base station using the first RSSI measurements; (c) measuring second RSSIs of a beacon signal broadcast from a second base station; (d) determining a second path loss value between the mobile station performing the second RSSI measurements and the second base station broadcasting the beacon signal using the second RSSI measurements; (e) estimating interference levels on each of a plurality of traffic channels using the first and second path loss values; (f) determining transmit powers required for the first base station to produce, at the mobile station, a signal on each of the plurality of available traffic channels whose strength is a predetermined level above an interference level estimated on that traffic channel taking into consideration the first and second path loss values; and (g) assigning a channel based on said determined transmit powers. - View Dependent Claims (12)
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13. A method for assigning downlink radio channels in a time division multiple access (TDMA) radio communication system comprising the steps of:
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(a) measuring, in a mobile station, received signal strength indications (RSSIs) of control signals broadcast from a first base station; (b) determining a path loss between the mobile station and the first base station using the RSSI measurements; (c) predicting RSSIs of interference signals emanating from a second base station on a plurality of available traffic channels; (d) determining a transmit power, on each carrier having one slot open, needed for each base station to produce, at the mobile station, a signal on the plurality of available traffic channels having a signal strength which is a predetermined level above a corresponding interference level measured on that traffic channel; (e) determining a transmit power, on each carrier having two slots open, needed for each base station to produce, at the mobile station, a signal on the plurality of available traffic channels having a signal strength which is a predetermined level above the interference level measured on that traffic channel; (f) determining a transmit power, on each idle carrier, needed for each base station to produce, at the mobile station, a signal on the plurality of available traffic channels having a strength which is a predetermined level above a corresponding interference level measured on that traffic channel; and (g) assigning a channel based on said determined transmit powers. - View Dependent Claims (14, 15, 16)
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17. A radiocommunication system comprising:
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means, disposed in a mobile station, for measuring received signal strength indications (RSSIs) of control signals broadcast from at least one base station; means for determining a path loss between the mobile station and the at least one base station using the RSSI measurements; means, disposed in the at least one base station, for measuring an RSSI of interference signals on a plurality of available traffic channels; means for determining transmit powers required for the mobile station to produce a signal on each of the plurality of available traffic channels at the at least one base station, wherein a strength of said signal is a predetermined level above a corresponding RSSI interference level measured on an available traffic channel taking into consideration the path loss; and means for assigning one of said plurality of available traffic channels as an uplink channel based on said determined transmit powers and a predetermined criteria. - View Dependent Claims (18)
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19. A radiocommunication system comprising:
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means, disposed in a mobile station, for measuring received signal strength indications (RSSIs) of control signals broadcast from at least one base station; means for determining a path loss between the mobile station and the at least one base station using the RSSI measurements; means, disposed in the mobile station, for measuring an RSSI of interference signals on a plurality of available traffic channels; means for determining transmit powers required of the at least one base station to produce, at the mobile station, a signal on each of the plurality of available traffic channels having a signal strength which is a predetermined level above a corresponding RSSI interference level measured on the traffic channel taking into consideration the path loss; and means for assigning one of said plurality of available traffic channels as a downlink channel based on said determined transmit powers. - View Dependent Claims (20)
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21. A radio communication system comprising:
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uplink and downlink channels which are separated by a predetermined frequency offset; means, disposed in a mobile station, for measuring received signal strength indications (RSSIs) of control signals broadcast from at least one base station; means for determining a path loss between the mobile station and the at least one base station using the RSSI measurements; means, disposed in the at least one base station, for measuring first RSSIs of interference signals on a plurality of available traffic channels; means for determining transmit powers required for the mobile station to produce a signal on each of the plurality of available traffic channels at the at least one base station, wherein a strength of said produced signal is a predetermined level above a corresponding first RSSI interference level measured on that traffic channel, taking into consideration the path loss; means, disposed in the mobile station, for measuring second RSSIs of interference signals on each of said plurality of available traffic channels; means for determining transmit powers required of the at least one base station to produce, at the mobile station, a signal on each of the plurality of available traffic channels having a signal strength which is a predetermined level above a corresponding second RSSI interference level measured on that traffic channel, taking into consideration the path loss; and means for assigning a radio channel based on at least one of said determined transmit powers required of the mobile station and said determined transmit powers required of the at least one base station. - View Dependent Claims (22, 23, 24)
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25. A radiocommunication system comprising:
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means, disposed in a mobile station, for measuring received signal strength indications (RSSIs) of control signals broadcast from at least one base station; means for determining a path loss between the mobile station and the at least one using the RSSI measurements; means for predicting an RSSI of interference signals emanating from said at least one base station on each of a plurality of available traffic channels; means for determining transmit powers required of the at least one base station to produce, at the mobile station, a signal on each of the plurality of available traffic channels having a signal strength which is a predetermined level above a corresponding RSSI interference level measured on that traffic channel, taking into consideration the path loss; and means for assigning a channel based on said determined transmit powers. - View Dependent Claims (26)
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27. A radiocommunication system comprising:
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means, disposed in a mobile station, for measuring first received signal strength indications (RSSIs) of control signals broadcast from a first base station; means for determining a first path loss value between the mobile station and the first base station using the first RSSI measurements; means for measuring a second RSSI of a beacon signal broadcast from a second base station; means for determining a second path loss value between a mobile station performing the second RSSI measurements and the second base station broadcasting the beacon signal using the second RSSI measurement; means for estimating interference levels on each of a plurality of traffic channels using the first and second path loss values; means for determining transmit powers required for the first base station to produce, at the mobile station, a signal on each of the plurality of available traffic channels whose strength is a predetermined level above an interference level estimated on that traffic channel taking into consideration the first and second path loss values; and means for assigning a channel based on said determined transmit powers. - View Dependent Claims (28)
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29. A time division multiple access (TDMA) radiocommunication system comprising:
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means, disposed in a mobile station, for measuring received signal strength indications (RSSIs) of control signals broadcast from a first base station; means for determining a path loss between the mobile station and the first base station using the RSSI measurements; means for predicting RSSIs of interference signals emanating from a second base station on a plurality of available traffic channels; means for determining a transmit power, on each carrier having one slot open, needed for each base station to produce, at the mobile station, a signal on the plurality of available traffic channels having a signal strength which is a predetermined level above a corresponding interference level measured on that traffic channel; means for determining a transmit power, on each carrier having two slots open, needed for each base station to produce, at the mobile station, a signal on the plurality of available traffic channels having a signal strength which is a predetermined level above the interference level measured on that traffic channel; means for determining a transmit power, on each idle carrier, needed for each base station to produce, at the mobile station, a signal on the plurality of available traffic channels having a strength which is a predetermined level above a corresponding interference level measured on that traffic channel; and means for assigning a channel based on said determined transmit powers. - View Dependent Claims (30, 31, 32)
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Specification