Power control method based at least partly on spread spectrum technique
First Claim
1. A power control method comprising:
- determining the transmit power of more than one bearer at a time in a mobile system having at least one mobile station and at least one base station by;
forming a control function at least partly on the basis of a quantity which at least partly represents a fast fading experienced by at least one bearer,calculating the control function in order to determine new output power values of said more than one bearer,generating an interference effect matrix which represents the mutual interference of different bearers, andinverting the generated interference effect matrix in order to form new power levels.
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Abstract
In connection with the determination the transmit power of a beginning transmission there is also determined, in the method according to the invention, suitable output powers for other transmissions, so that the entity formed by all controlled transmissions is as close to the optimum as possible already at the beginning of a new frame. The method according to the invention takes into consideration the effect of a beginning transmission on other transmissions. The method according to the invention further takes into consideration changes in the conditions during the previous frame by including the control history of the fast power control as initial information of the calculation made during the re-determination of the output powers, for instance as a suitable statistical quantity of the transmission history of each transmission, for instance as an average over a certain period.
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Citations
25 Claims
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1. A power control method comprising:
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determining the transmit power of more than one bearer at a time in a mobile system having at least one mobile station and at least one base station by; forming a control function at least partly on the basis of a quantity which at least partly represents a fast fading experienced by at least one bearer, calculating the control function in order to determine new output power values of said more than one bearer, generating an interference effect matrix which represents the mutual interference of different bearers, and inverting the generated interference effect matrix in order to form new power levels.
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2. A power control method comprising:
determining the transmit power of more than one bearer at a time in a mobile system having at least one mobile station and at least one base station by; forming a control function at least partly on the basis of a quantity which at least partly represents a fast fading experienced by at least one bearer, calculating the control function in order to determine new output power values of said more than one bearer, calculating more than one set of output power values, forming a utility function in order to select one set of output power values, selecting the set of output power values which minimizes the value of said utility functions, generating an interference effect matrix, which represents the mutual interferences of different bearers, and inverting the generated interference effect matrix in order to form new power levels.
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3. A software code configured and stored in a processor readable medium, wherein the software code is configured to:
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communicate at least partly on a spread spectrum technique configured for either at least one mobile station or at least one base station, define at least one bearer as a communication entity between the at least one base station and the at least one mobile station, the at least one bearer including variable factors containing transmission rate, delay, bit error rate and having an impact on the communication, form a control function at least partly on the basis of a quantity which at least partly represents the control history experienced by the at least one bearer, calculate the control function in order to determine transmit power values to be used for at least one of said bearers, determine the transmit power for more than one bearer when the transmission rate of the at least one bearer changes so that the control of said at least one of said bearers is arranged to impact the control of other bearers, generate an interference effect matrix, which represents the mutual interferences of different bearers, and invert the generated interference effect matrix in order to form new power levels.
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4. A base station comprising:
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a module configured to communicate at least partly on a spread spectrum technique for at least one mobile station and the base station, and wherein a bearer is defined as a communication entity between the base station and the at least one mobile station, the bearer including variable factors containing transmission rate, delay, bit error rate and having an impact on the communication, a generator to generate a quantity which at least partly depends on the control history experienced by at least one bearer, a device to determine the output power values for more than one bearer at least partly on the basis of said quantity, a controller to control the transmit power of at least one bearer on the basis of said transmit power values, said controller being so configured that when the transmit power of more than one bearer is configured to be determined when the transmission rate of at least one bearer changes, the controller to control the at least one of the bearers is configured to impact the control of other bearers, a generator to generate an interference effect matrix, which represents the mutual interferences of different bearers, and an inverter to invert the generated interference effect matrix in order to form new power levels.
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5. A control unit comprising:
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a module configured to communicate at least partly on a spread spectrum technique for at least one mobile station and at least one base station, and wherein a bearer is defined as a communication entity between the at least one base station and the at least one mobile station, the bearer including variable factors containing transmission rate, delay, bit error rate and having an impact on the communication, a generator to generate a quantity which at least partly depends on the control history experienced by at least one bearer, a device to determine the output power values for more than one bearer at least partly on the basis of said quantity, a controller to control the transmit power of at least one bearer on the basis of said transmit power values, said controller being so configured that when the transmit power of more than one bearer is configured to be determined when the transmission rate of at least one bearer changes, the controller to control the at least one of the bearers is configured to impact the control of other bearers, a generator to generate an interference effect matrix, which represents the mutual interferences of different bearers, and an inverter to invert the generated interference effect matrix in order to form new power levels. - View Dependent Claims (6)
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7. A power control method comprising:
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defining at least one bearer as a communication entity between at least one base station and at least one mobile station, wherein the at least one base station or the at least one mobile station is configured to communicate at least partly on a spread spectrum technique, the at least one bearer including variable factors containing transmission rate, delay, bit error rate and having an impact on the communication, forming a control function at least partly on the basis of a quantity which at least partly represents the control history experienced by the at least one bearer, calculating the control function in order to determine transmit power values to be used for at least one of said bearers, determining the transmit power for more than one bearer when the transmission rate of the at least one bearer changes so that the control of said at least one of said bearers is arranged to impact the control of other bearers, generating an interference effect matrix, which represents the mutual interferences of different bearers, and inverting the generated interference effect matrix in order to form new power levels. - View Dependent Claims (9, 10, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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8. An element comprising:
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a module configured to define at least one bearer as a communication entity between at least one base station and at least one mobile station, wherein the at least one base station or the at least one mobile station is configured to communicate at least partly on a spread spectrum technique, the at least one bearer including variable factors containing transmission rate, delay, bit error rate and having an impact on the communication, a generator to generate a quantity which at least partly depends on the control history experienced by at least one bearer, a device to determine the output power values for more than one bearer at least partly on the basis of said quantity, a controller to control the transmit power of at least one bearer on the basis of said transmit power values, said controller being so configured that when the transmit power of more than one bearer is configured to be determined when the transmission rate of at least one bearer changes, the controller to control the at least one of the bearers is configured to impact the control of other bearers, a generator to generate an interference effect matrix, which represents the mutual interferences of different bearers, and an inverter to invert the generated interference effect matrix in order to form new power levels.
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11. A base station comprising:
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means for communicating at least partly on a spread spectrum technique for at least one mobile station and the base station, and wherein a bearer is defined as a communication entity between the base station and the at least one mobile station, the bearer including variable factors containing transmission rate, delay, bit error rate and having an impact on the communication, means for generating a quantity which at least partly depends on the control history experienced by at least one bearer, means for determining the output power values for more than one bearer at least partly on the basis of said quantity, means for controlling the transmit power of at least one bearer on the basis of said transmit power values, said controller being so configured that when the transmit power of more than one bearer is configured to be determined when the transmission rate of at least one bearer changes, the controller to control the at least one of the bearers is configured to impact the control of other bearers, means for generating an interference effect matrix, which represents the mutual interferences of different bearers, and means for inverting the generated interference effect matrix in order to form new power levels.
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12. A control unit comprising:
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means for communicating at least partly on a spread spectrum technique for at least one mobile station and at least one base station, and wherein a bearer is defined as a communication entity between the at least one base station and the at least one mobile station, the bearer including variable factors containing transmission rate, delay, bit error rate and having an impact on the communication, means for generating a quantity which at least partly depends on the control history experienced by at least one bearer, means for determining the output power values for more than one bearer at least partly on the basis of said quantity, means for controlling the transmit power of at least one bearer on the basis of said transmit power values, said controller being so configured that when the transmit power of more than one bearer is configured be determined when the transmission rate of at least one bearer changes, the controller to control the at least one of the bearers is configured to impact to the control of other bearers, means for generating an interference effect matrix, which represents the mutual interferences of different bearers, and means for inverting the generated interference effect matrix in order to form new power levels.
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13. An element comprising:
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means for communicating at least partly on a spread spectrum technique either for at least one mobile station or at least one base station, and wherein a bearer is defined as a communication entity between the at least one base station and the at least one mobile station, the bearer including variable factors containing transmission rate, delay, bit error rate and having an impact on the communication, means for generating a quantity which at least partly depends on the control history experienced by at least one bearer, means for determining the output power values for more than one bearer at least partly on the basis of said quantity, means for controlling the transmit power of at least one bearer on the basis of said transmit power values, said controller being so configured that when the transmit power of more than one bearer is configured to be determined when the transmission rate of at least one bearer changes, the controller to control the at least one of the bearers is configured to impact the control of other bearers, means for generating an interference effect matrix, which represents the mutual interferences of different bearers, and means for inverting the generated interference effect matrix in order to form new power levels.
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Specification