Synchronization signal transmitting method and base station apparatus
First Claim
1. A synchronization signal transmitting method of controlling a transmission direction of a transmission beam for a synchronization signal used in cell search by beamforming using a plurality of antenna elements provided in a base station apparatus, the synchronization signal transmitting method comprising:
- a synchronization signal processing step of generating the synchronization signal including information to identify the transmission beam for the synchronization signal and changing a beamforming weight for the synchronization signal at every given time interval;
a selecting step of selecting beamforming parameters including at least the time interval for changing the beamforming weight and a beam width of the transmission beam for the synchronization signal; and
a transmission step of transmitting the synchronization signal generated with the beamforming weight in downlink,wherein, in the synchronization signal processing step, the beamforming parameters selected in the selecting step are used as a basis to control the beamforming weight and the time interval for changing the beamforming weight, andwherein, in the selecting step, the time interval for changing the beamforming weight is determined based on a signal length of the synchronization signal.
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Accused Products
Abstract
In order to make full use of the performance of a Massive-MIMO-applied communication system, provided is a base station apparatus for controlling a transmission direction of a transmission beam for a synchronization signal used in cell search by beamforming using a plurality of antenna elements. The base station apparatus has a synchronization signal processing section (62) that generates the synchronization signal including information to identify the transmission beam for the synchronization signal and changes a beamforming weight for the synchronization signal at every given time interval; and a transmission section (64) that transmits the synchronization signal generated with the beamforming weight in downlink.
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Citations
7 Claims
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1. A synchronization signal transmitting method of controlling a transmission direction of a transmission beam for a synchronization signal used in cell search by beamforming using a plurality of antenna elements provided in a base station apparatus, the synchronization signal transmitting method comprising:
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a synchronization signal processing step of generating the synchronization signal including information to identify the transmission beam for the synchronization signal and changing a beamforming weight for the synchronization signal at every given time interval; a selecting step of selecting beamforming parameters including at least the time interval for changing the beamforming weight and a beam width of the transmission beam for the synchronization signal; and a transmission step of transmitting the synchronization signal generated with the beamforming weight in downlink, wherein, in the synchronization signal processing step, the beamforming parameters selected in the selecting step are used as a basis to control the beamforming weight and the time interval for changing the beamforming weight, and wherein, in the selecting step, the time interval for changing the beamforming weight is determined based on a signal length of the synchronization signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A base station apparatus for controlling a transmission direction of a transmission beam for a synchronization signal used in cell search by beamforming using a plurality of antenna elements, the base station apparatus comprising:
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a processor that generates the synchronization signal including information to identify the transmission beam for the synchronization signal and changes a beamforming weight for the synchronization signal at every given time interval; the processor selects beamforming parameters including at least the time interval for changing the beamforming weight and a beam width of the transmission beam for the synchronization signal; and a transmitter that transmits the synchronization signal generated with the beamforming weight in downlink, wherein the beamforming parameters selected by the processor are used as a basis to control the beamforming weight and the time interval for changing the beamforming weight, and wherein the time interval for changing the beamforming weight is determined by the processor based on a signal length of the synchronization signal.
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Specification