Method and apparatus for detecting synchronization signal in wireless communication system
Disclosed is a method and apparatus for performing, by a terminal, time and frequency synchronization with a base station in an initial access process to the base station. The method includes receiving, by the terminal, a physical broadcast channel, and detecting a synchronization signal based on the received physical broadcast channel.
1. A method of a terminal in a wireless communication system, the method comprising:
identifying a periodicity and pattern for a physical broadcast channel (PBCH) including a master information block (MIB), in case of an initial access, wherein the periodicity and pattern for the PBCH is predetermined;
identifying time resources for a synchronization signal based on the periodicity and pattern for the PBCH;
detecting the synchronization signal based on the time resources; and
receiving the MIB on the PBCH based on the synchronization signal,
wherein the periodicity is a multiple of a radio frame.
2. The method of claim 1 , wherein the periodicity is one radio frame, and
wherein positions where the PBCH is repeated are included in subframes in the one radio frame.
3. The method of claim 2 , wherein the time resources is determined based on positions of the subframes and an interval between the subframes in the one radio frame.
4. The method of claim 2 ,
wherein the subframes are determined based on comparison between an auto-correlation value and a preset threshold value, and
wherein the auto-correlation value is derived based on a first signal component corresponding to the PBCH and a second signal component corresponding to a repeated PBCH.
5. The method of claim 4 , wherein the subframes including an orthogonal frequency division multiplexing (OFDM) symbol corresponding to the first signal component and an OFDM symbol corresponding to the second signal component is determined as the position where the physical broadcast channel is repeated, if the auto-correlation value is greater than the preset threshold value.
6. The method of claim 4 , wherein each of the first signal component and the second signal component is corresponding to an orthogonal frequency division multiplexing (OFDM) symbol in subframe, and
wherein the auto-correlation value is determined based on interval between an OFDM symbol corresponding to the first signal component and an OFDM symbol corresponding to the second signal component.
7. The method of claim 1 , wherein detecting the synchronization signal further includes:
deriving a cross-correlation value using a signal corresponding to the time resources and a preset sequence; and
detecting the synchronization signal based on comparison between the cross-correlation value and a specific threshold value.
8. The method of claim 7 ,
wherein the synchronization signal is detected based on a reception time of the signal corresponding to the time resources when the cross-correlation value is greater than the specific threshold value.
9. A terminal performing wireless communication, the terminal comprising:
a communication unit and
a controller coupled with the communication unit and configured to:
identify a periodicity and pattern for physical broadcast channel (PBCH) including a master information block (MIB), in case of an initial access, wherein the periodicity and pattern for the PBCH is predetermined,
identify time resources for a synchronization signal based on the periodicity and pattern for the PBCH,
detect the synchronization signal based on the time resources, and
receive the MIB on the PBCH based on the synchronization signal,
wherein the periodicity is a multiple of a radio frame.
10. The terminal of claim 9 ,
wherein the periodicity is one radio frame, and
wherein positions where the PBCH is repeated are included in subframes in the one radio frame.
11. The terminal of claim 10 ,
wherein the controller is further configured to determine the time resources based on positions of the subframes and an interval between the subframes in the one radio frame.
12. The terminal of claim 10 ,
wherein the controller is further configured to determine the subframes are determined based on comparison between an auto-correlation value and a preset threshold value, and
wherein the auto-correlation value is derived based on a first signal component corresponding to the PBCH and a second signal component corresponding to a repeated PBCH.
13. The terminal of claim 12 , wherein the controller is further configured to determine the subframes including an orthogonal frequency division multiplexing (OFDM) symbol corresponding to the first signal component and an OFDM symbol corresponding to the second signal component is determined as the position where the physical broadcast channel is repeated, if the auto-correlation value is greater than the preset threshold value.
14. The terminal of claim 12 , wherein each of the first signal component and the second signal component is corresponding to an orthogonal frequency division multiplexing (OFDM) symbol in subframe, and
wherein the auto-correlation value is determined based on interval between an OFDM symbol corresponding to the first signal component and an OFDM symbol corresponding to the second signal component.
15. The terminal of claim 9 ,
wherein the controller is further configured to:
derive a cross-correlation value using a signal corresponding to the time resources and a preset sequence, and
detect the synchronization signal based on comparison between the cross-correlation value and a specific threshold value.
16. The terminal of claim 15 ,
wherein the controller is further configured to detect the synchronization signal based on a reception time of the signal corresponding to the time resources when the cross-correlation value is greater than the specific threshold value.