Apparatus and method for reporting service load to mobile station in mobile telecommunication system
First Claim
Patent Images
1. A transmitter in a base station, comprising:
- a pilot gain controller for generating a first gain value and a second gain value according to a current transmission power and a remaining transmission power of the base station;
a first multiplier for receiving pilot bits, multiplying the pilot bits by the first gain value, and generating a first control signal, and thereby controlling the transmission power level of the pilot bits a second multiplier for receiving the pilot bits, multiplying the pilot bits by the second gain value, and generating a second control signal, and thereby controlling the transmission power level of the pilot bits;
a first spreader for generating a first pilot signal by spreading the first control signal with a first orthogonal code;
a second spreader for generating a second pilot signal by spreading the second control signal with a second orthogonal code; and
an adder for adding the first pilot signal to the second pilot signal.
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Abstract
There is provided a method and apparatus for selecting an appropriate base station and an optimal data rate to provide a voice service and a data service based on a voice service load in a CDMA system. A base station transmits two pilot signals orthogonally spread with different orthogonal codes in association with its voice service load, and a mobile station estimates the voice service load based on a pilot power ratio.
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Citations
22 Claims
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1. A transmitter in a base station, comprising:
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a pilot gain controller for generating a first gain value and a second gain value according to a current transmission power and a remaining transmission power of the base station;
a first multiplier for receiving pilot bits, multiplying the pilot bits by the first gain value, and generating a first control signal, and thereby controlling the transmission power level of the pilot bits a second multiplier for receiving the pilot bits, multiplying the pilot bits by the second gain value, and generating a second control signal, and thereby controlling the transmission power level of the pilot bits;
a first spreader for generating a first pilot signal by spreading the first control signal with a first orthogonal code;
a second spreader for generating a second pilot signal by spreading the second control signal with a second orthogonal code; and
an adder for adding the first pilot signal to the second pilot signal. - View Dependent Claims (2, 3, 4)
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5. A transmitter in a base station, comprising:
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a pilot gain controller for generating a first gain value and a second gain value according to a current transmission power and a remaining transmission power of the base station;
a first pilot channel generator for receiving pilot bits and generating a first pilot channel signal by controlling the gain of the pilot bits with the first gain value and spreading the gain-controlled signal with a first orthogonal code;
a second pilot channel generator for receiving the pilot bits and generating a second pilot channel signal by controlling the gain of the pilot bits with the second gain value and spreading the gain-controlled signal with a second orthogonal code;
an adder for adding the first and second pilot channel signals; and
a channel transmitter for PN-spreading the output signal of the adder, converting the frequency of the PN-spread signal, and transmitting the converted signal.
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6. A receiver in a mobile station for receiving from a base station a first pilot signal and a second pilot signal representative of a current transmission power and a remaining transmission power of the base station, comprising:
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a first receiver for despreading the first pilot signal received on a forward pilot channel with a first orthogonal code and measuring the reception power of the despread signal;
a second receiver for despreading the second pilot signal received on the forward pilot channel with a second orthogonal code and measuring the reception power of the despread signal; and
a service load estimator for estimating the current transmission power and the remaining transmission power of the base station by determining a ratio of the reception power of the second pilot signal to the reception power of the first pilot signal. - View Dependent Claims (7, 8, 9, 10)
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11. A receiver in a mobile station for receiving from a base station a first pilot signal and a second pilot signal representative of a current transmission power and a remaining transmission power of a base station, comprising:
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a first multiplier for despreading a pilot signal received on a forward pilot channel with a first orthogonal code and outputting the first pilot signal;
a second multiplier for despreading the pilot signal received on the forward pilot channel with a second orthogonal code and outputting the second pilot signal;
a first power estimator for estimating reception power of the first pilot signal received from the first multiplier;
a second power estimator for estimating reception power of the second pilot signal received from the second multiplier; and
a service load estimator for estimating the current transmission power and the remaining transmission power of the base station by determining a ratio of the reception power of the second pilot signal to the reception power of the first pilot signal.
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12. A method of reporting current transmission power to a mobile station by a base station, comprising the steps of:
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generating a first gain value and a second gain value according to a current transmission power and a remaining transmission power;
receiving pilot bits;
generating a first pilot signal by controlling the transmission power level of the pilot bits with the first gain value and spreading the gain-controlled signal with a first orthogonal code, and transmitting the first pilot signal; and
generating a second pilot signal by controlling the transmission power level of the pilot bits with the second gain value and spreading the gain-controlled signal with a second orthogonal code, and transmitting the second pilot signal. - View Dependent Claims (13, 14, 15)
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16. A method of receiving from a base station a first pilot signal and a second pilot signal in association with a current transmission power and a remaining transmission power of a base station by a mobile station, comprising the steps of:
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receiving a pilot signal on a forward pilot channel, despreading the pilot signal with a first orthogonal code, and outputting the first pilot signal;
despreading the pilot signal with a second orthogonal code and outputting the second pilot signal;
estimating the reception powers of the first pilot signal and the second pilot signal; and
estimating the current transmission power and the remaining transmission power of the base station by determining a ratio of the reception power of the second pilot signal to the reception power of the first pilot signal. - View Dependent Claims (17, 18, 19, 20)
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21. A method of implementing a handoff in a mobile station that receives a first pilot signal and a second pilot signal representative of a current transmission power and a remaining transmission power of a base station, comprising the steps of:
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receiving a first pilot signal and a second pilot signal from each base station that belongs to an active set of the mobile station;
measuring the reception powers of the first pilot signal and the second pilot signal received from each base station;
estimating the current transmission power of each base station by calculating a ratio of the reception power of the second pilot signal to the reception power of the first pilot signal;
estimating the remaining transmission power of each base station based on the estimated current transmission power and using the estimated remaining transmission power of each base station as a reception power of a predetermined service allocable by the base station;
selecting the strongest reception power and a base station corresponding to the strongest reception power; and
reporting the selected reception power and the selected base station to a network.
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22. A method of implementing a handoff in a mobile station that receives a first pilot signal and a second pilot signal representative of a current transmission power used for a voice service and the remaining transmission power of a base station, comprising the steps of:
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receiving a first pilot signal and a second pilot signal from each base station that belongs to an active set of the mobile station;
measuring the reception power of the first pilot signal and the second pilot signal received from each base station;
estimating the load of the voice service provided by each base station by calculating a ratio of the reception power of the second pilot signal to the reception power of the first pilot signal;
estimating the remaining transmission power of each base station based on the estimated voice service load and using the estimated remaining transmission power of each base station as a reception power of a data service allocable by the base station; and
selecting the strongest reception power and a base station corresponding to the strongest reception power and reporting the selected reception power and the selected base station to a network.
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Specification