Power efficient wireless transmission
First Claim
1. A method, comprising:
- allocating, in a wireless telecommunication system in which the data transmission on a given frequency band is divided into a plurality of time slots, at least a portion of the time slots of the frequency band to a broadcast control channel and at least one different channel;
adjusting a transmit power level of at least one time slot in a different channel on the basis of contents of the time slot in the different channel;
transmitting a broadcast signal with a given transmit power in a time slot allocated to the broadcast control channel;
transmitting a signal with the adjusted transmit power level in the time slot of the different channel;
decreasing the transmit power level of a time slot for which there is no payload data allocated for transmission; and
transmitting a signal in the time slot with a lower transmit power level than that of the broadcast signal.
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Accused Products
Abstract
A solution for power efficient transmission in a wireless telecommunication system is provided. The telecommunication system utilizes a time slot based data transmission scheme. According to the provided solution, at least a portion of time slots is allocated to a broadcast control channel on a given frequency and to at least one different channel. The transmit power levels of the time slot or time slots allocated to another channel or other channels than the broadcast control channel are then adjusted on the basis of contents of the time slots. The broadcast signal is then transmitted with a given transmit power level on a time slot allocated to the broadcast control channel, and a signal or signals on other time slots are transmitted with the adjusted transmit power level.
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Citations
25 Claims
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1. A method, comprising:
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allocating, in a wireless telecommunication system in which the data transmission on a given frequency band is divided into a plurality of time slots, at least a portion of the time slots of the frequency band to a broadcast control channel and at least one different channel; adjusting a transmit power level of at least one time slot in a different channel on the basis of contents of the time slot in the different channel; transmitting a broadcast signal with a given transmit power in a time slot allocated to the broadcast control channel; transmitting a signal with the adjusted transmit power level in the time slot of the different channel; decreasing the transmit power level of a time slot for which there is no payload data allocated for transmission; and transmitting a signal in the time slot with a lower transmit power level than that of the broadcast signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
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a controller configured to divide data transmission on a given frequency band into a plurality of time slots and allocate at least a portion of the time slots of the frequency band to a broadcast control channel and at least one different channel, and a transmitter configured to adjust a transmit power level of at least one time slot in a different channel on the basis of contents of the time slot in the different channel, transmit a broadcast signal with a given transmit power in a time slot allocated to the broadcast control channel, and transmit a signal with the adjusted transmit power level in the time slot of the different channel, wherein the transmitter is configured to adjust the transmit power level by decreasing the power level of a time slot for which there is no data or a control signal allocated for transmission and to transmit the signal in the time slot with a lower transmit power level than that of the broadcast signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A base station controller apparatus, comprising:
- a processor; and
a memory including computer program code, the memory and the computer program code configured to, with the processor, cause the base station controller apparatus at least configured to divide data transmission on a given frequency band into a plurality of time slots and allocate at least a portion of the time slots of the frequency band to a broadcast control channel and at least one different channel, to decrease a transmit power level of at least one time slot in a different channel on the basis of contents of the time slot in the different channel, and to control a base station to transmit a broadcast signal with a given transmit power in a time slot allocated to the broadcast control channel and a signal with the decreased transmit power level in the time slot of the different channel.
- a processor; and
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20. A base station, comprising:
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a first communication unit connected to a controller of the base station; a second communication unit configured to transmit and receive radio signals, and a processing unit configured to receive through the first communication unit a command to allocate at least a portion of the time slots of the frequency band to a broadcast control channel and at least one different channel, control the second communication unit to transmit a broadcast signal with a given transmit power in a time slot allocated to the broadcast control channel, decrease a transmit power level of at least one time slot in a different channel on the basis of contents of the time slot in the different channel, and control the second communication unit to transmit a signal with the decreased transmit power level in the time slot of the different channel.
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21. A system, comprising:
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means for allocating at least a portion of time slots of a frequency band to a broadcast control channel and at least one different channel; means for decreasing a transmit power level of at least one time slot in a different channel on the basis of contents of the time slot in the different channel; means for transmitting a broadcast signal with a given transmit power in a time slot allocated to the broadcast control channel, and means for transmitting a signal with the decreased transmit power level in the time slot of the different channel.
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22. A computer program distribution medium readable by a computer and encoding a computer program of instructions for executing a computer process for data transmission in a wireless telecommunication system in which the data transmission on a given frequency band is divided into a plurality of time slots, the process comprising:
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allocating at least a portion of the time slots of the frequency band to a broadcast control channel and at least one different channel; decreasing a transmit power level of at least one time slot in a different channel on the basis of contents of the time slot in the different channel; transmitting a broadcast signal with a given transmit power in a time slot allocated to the broadcast control channel, and transmitting a signal with the decreased transmit power level in the time slot of the different channel. - View Dependent Claims (23)
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24. A base station controller apparatus, comprising:
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communication means for providing a communication connection with one or more base stations controlled by the base station controller apparatus and transmitting signals in time slots with variable transmit power levels under the control of the base station controller apparatus; memory means capable of storing information; means for storing into the memory means information on the transmit power levels of the one or more base stations; means for receiving, through the communication means from a mobile terminal served by a serving base station, reception power level measurement information related to signals received by the mobile terminal from the serving base station and from one or more handover candidate base stations; means for obtaining knowledge on transmit power levels of the signals measured by the mobile terminal, means for compensating the received reception power level measurement information according to the knowledge on the transmit power levels, and means for determining, on the basis of compensated reception power level measurement information, whether or not to initiate a handover procedure for the mobile terminal, wherein the transmit power level is decreased of a time slot for which there is no data or a control signal allocated for transmission and a signal is transmitted in the time slot with a lower transmit power level than that of the broadcast signal.
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25. A computer program distribution medium readable by a computer and encoding a computer program of instructions for executing a computer process, comprising:
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receiving, from a mobile terminal served by a serving base station, reception power level measurement information related to signals received by the mobile terminal from the serving base station and from one or more handover candidate base stations, wherein the base stations transmit signals in time slots with variable transmit power levels; obtaining knowledge on transmit power levels of the signals measured by the mobile terminal; compensating the received reception power level measurement information according to the knowledge on the transmit power levels, and determining, on the basis of compensated reception power level measurement information, whether or not to initiate a handover procedure for the mobile terminal, wherein a transmit power level is decreased of a time slot for which there is no data or a control signal allocated for transmission and a signal is transmitted in the time slot with a lower transmit power level than that of the broadcast signal.
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Specification