Method for transmitting and receiving synchronization signal by using nested orthogonal phase pattern vector in wireless communication system
Disclosed is a method for receiving a synchronization signal, comprising: respectively receiving, from a plurality of base stations, a plurality of synchronization signals generated by using a phase pattern vector set, which is nested orthogonal and hierarchically configured; measuring a sequence index and an index of a phase pattern vector for the plurality of synchronization signals; selecting, among the plurality of base stations, a base station having the highest correlation value calculated as a measurement result; and establishing a connection with the selected base station, wherein the phase pattern vector set has different phase pattern vectors for changing a phase of a synchronization signal sequence up to a predetermined repetition number.
1. A method of receiving a plurality of synchronization signals by a user equipment in a wireless communication system, the method comprising:
receiving the plurality of synchronization signals generated using a nested orthogonal phase pattern vector set configured hierarchically from a plurality of base stations, respectively;
estimating a sequence index and an index of a phase pattern vector for the plurality of synchronization signals, respectively;
selecting a base station having a highest correlation value calculated as a result of the estimations, from the plurality of base stations; and
establishing a connection to the selected base station,
wherein the phase pattern vector set is configured with different phase pattern vectors for changing a phase of a synchronization signal sequence by a predetermined repetition count.
2. The method of claim 1 , wherein base stations having an identical repetition count of the synchronization signal sequence among the plurality of base stations configure an identical hierarchy, wherein base stations having a relatively high repetition count configure a higher hierarchy, and wherein base stations having a relatively low repetition count configure a lower hierarchy.
3. The method of claim 2 , wherein phase pattern vectors assigned to the base stations belonging to the identical hierarchy are orthogonal or quasi-orthogonal to each other.
4. The method of claim 2 , wherein phase pattern vectors assigned to the lower hierarchy are orthogonal or quasi-orthogonal to a portion of phase pattern vectors assigned to the higher hierarchy.
5. The method of claim 4 , wherein the phase pattern vectors assigned to the higher hierarchy do not include the phase pattern vectors assigned to the lower hierarchy.
6. The method of claim 2 , wherein a plurality of base stations using a same phase pattern vector set transmit synchronization signals at a same timing point by being synchronized with each other.
7. The method of claim 4 , wherein a synchronization signal of a base station using the phase pattern vectors assigned to the lower hierarchy is transmitted within a portion of a time interval for transmitting a synchronization signal of another base station using the phase pattern vectors assigned to the higher hierarchy.
8. The method of claim 7 , wherein the base station using the phase pattern vectors assigned to the lower hierarchy transmits ‘0’ in a portion, in which the base station does not transmit the synchronization signal of its own, of the time interval.
9. A user equipment receiving a plurality of synchronization signals in a wireless communication system, the user equipment comprising:
a transmitter;
a receiver; and
a processor, operably connected to the transmitter and the receiver, that:
controls the receiver to receive the plurality of synchronization signals generated using a nested orthogonal phase pattern vector set configured hierarchically from a plurality of base stations, respectively,
estimates a sequence index and an index of a phase pattern vector for the plurality of synchronization signals, respectively,
selects a base station having a highest correlation value calculated as a result of the estimations from the plurality of base stations, and establishes a connection to the selected base station, wherein the phase pattern vector set is configured with different phase pattern vectors for changing a phase of a synchronization signal sequence by a predetermined repetition count.
10. The user equipment of claim 9 , wherein base stations having an identical repetition count of the synchronization signal sequence among the plurality of base stations configure an identical hierarchy, wherein base stations having a relatively high repetition count configure a higher hierarchy, and wherein base stations having a relatively low repetition count configure a lower hierarchy.
11. The user equipment of claim 10 , wherein phase pattern vectors assigned to the base stations belonging to the identical hierarchy are orthogonal or quasi-orthogonal to each other.
12. The user equipment of claim 10 , wherein phase pattern vectors assigned to the lower hierarchy are orthogonal or quasi-orthogonal to a portion of -phase pattern vectors assigned to the higher hierarchy.
13. The user equipment of claim 12 , wherein the phase pattern vectors assigned to the higher hierarchy do not include the phase pattern vectors assigned to the lower hierarchy.
14. The user equipment of claim 10 , wherein a plurality of base stations using a same phase pattern vector set transmit synchronization signals at a same timing point by being synchronized with each other.
15. The user equipment of claim 12 , wherein a synchronization signal of base station using the phase pattern vectors assigned to the lower hierarchy is transmitted within a portion of a time interval for transmitting a synchronization signal of another base station using the phase pattern vectors assigned to the higher hierarchy.
16. the user equipment of claim 15 , wherein the base station using the phase pattern vectors assigned to the lower hierarchy transmits ‘0’ in a portion, in which the base station does not transmit the synchronization signal of its own, of the time interval.