Apparatus for transmitting synchronous signal, terminal for receiving synchronous signal and method thereof
The present invention relates to a technique of improving, when performing synchronization between a transmitting device and a receiving device communicating on the basis of a beamforming technique, an overall beamforming synchronization performance by enabling fast beam tracking in a receiving device.
1. An apparatus for transmitting a synchronization signal, the apparatus comprising:
a radio resource configuring unit configured to:
divide a radio resource designated for synchronization into a timing synchronization frequency region and a beam synchronization frequency region, and
form a plurality of radio resource blocks in the beam synchronization frequency region, each of the plurality of radio resource blocks including two or more neighboring radio resource elements among radio resource elements included in the beam synchronization frequency region;
a timing synchronization performing unit configured to transmit, to a terminal through at least one antenna beam generated in the timing synchronization frequency region, a first synchronization signal for frequency synchronization and a second synchronization signal for frame synchronization in order to perform timing synchronization; and
a beamforming synchronization performing unit configured to transmit a beam synchronization signal, as a third synchronization signal, to the terminal through antenna beams generated for the plurality of radio resource blocks formed in the beam synchronization frequency region in order to perform beamforming synchronization,
wherein:
the number of the radio resource elements included in each of the plurality of radio resource blocks is determined by the number of antenna beams being able to be generated by the terminal receiving the beam synchronization signal.
2. The apparatus of claim 1 , wherein the beamforming synchronization performing unit transmits the beam synchronization signal, as the third synchronization signal, in different directions through antenna beams formed for each of the plurality of radio resource blocks, to perform beamforming synchronization based on the beam synchronization signal.
3. The apparatus of claim 1 , wherein the terminal receives the beam synchronization signal through two or more antenna beams of different directions to perform beamforming synchronization based on the beam synchronization signal, and
each of the two or more antenna beams is generated by a combination of radio resource elements designated for each of the plurality of radio resource blocks.
4. The apparatus of claim 2 , wherein the radio resource is a symbol among a plurality of symbols included in a downlink synchronization channel subframe periodically allocated, and
the beamforming synchronization performing unit transmits the beam synchronization signal in a direction different from that of a previous symbol for each of the plurality of radio resource blocks in each of the plurality of symbols.
5. The apparatus of claim 1 , wherein the radio resource configuring unit configures an information transmitting block for transmitting information related to a communication system between the radio resource blocks, and
information allocated to the information transmitting block is transmitted through an antenna beam generated for one of two radio resource blocks neighboring the information transmitting block.
6. The apparatus of claim 1 , wherein the radio resource element corresponds to a minimum frequency element of a radio resource required for generating one antenna beam by the terminal.
7. The apparatus of claim 1 , wherein:
the number of the plurality of radio resource blocks is determined by the number of antennas included in the apparatus transmitting the beam synchronization signal; and
the number of the radio resource elements included in each of the plurality of radio resource blocks is the same as the number of antenna beams being able to be generated by the terminal receiving the beam synchronization signal.
8. A method for transmitting a synchronization signal, the method comprising:
dividing a radio resource designated for synchronization into a timing synchronization frequency region and a beam synchronization frequency region;
configuring a plurality of radio resource blocks in the beam synchronization frequency region, each of the plurality of radio resource blocks including two or more neighboring radio resource elements among radio resource elements included in the beam synchronization frequency region;
transmitting, to a terminal through at least one antenna beam generated in the timing synchronization frequency region, a first synchronization signal for frequency synchronization and a second synchronization signal for frame synchronization in order to perform timing synchronization; and
transmitting a beam synchronization signal, as a third synchronization signal, to the terminal through antenna beams generated for the plurality of radio resource blocks configured in the beam synchronization frequency region in order to perform beamforming synchronization,
wherein:
the number of the radio resource elements included in each of the plurality of radio resource blocks is determined by the number of antenna beams being able to be generated by the terminal receiving the beam synchronization signal.
9. The method of claim 8 , wherein the transmitting the third synchronization signal comprises transmitting the beam synchronization signal in different directions through antenna beams formed for each of the plurality of radio resource blocks, to perform beamforming synchronization based on the beam synchronization signal.
10. The method of claim 9 , wherein the terminal receives the beam synchronization signal through two or more antenna beams of different directions to perform beamforming synchronization based on the beam synchronization signal,
wherein each of the two or more antenna beams is generated for a combination of radio resource elements designated for each of the plurality of radio resource blocks.
11. The method of claim 9 , wherein the radio resource is a symbol among a plurality of symbols included in a downlink synchronization channel subframe periodically allocated, and
the transmitting the third synchronization signal comprises transmitting the beam synchronization signal in a direction different from that of a previous symbol for each of the plurality of radio resource blocks in each of the plurality of symbols.