Cell searching method and apparatus in multi-carrier system
Provided are a cell searching method and an apparatus in a multi-carrier system. A terminal acquires a first physical cell identity (PCI) for a first downlink component carrier, and acquires an expanded PCI for a second downlink component carrier. A first downlink reference signal through the first downlink element carrier is transmitted on the basis of the PCI, and a second downlink reference signal through the second downlink component carrier is transmitted on the basis of the expanded PCI.
1. A cell search method in a multiple carrier system, the method comprising:
obtaining a first physical cell identity (PCI) for a first downlink component carrier; and
obtaining an extended PCI for a second downlink component carrier,
wherein a first downlink reference signal through the first downlink component carrier is transmitted based on the first PCI, and a second downlink reference signal through the second downlink component carrier is transmitted based on the extended PCI,
wherein the extended PCI is obtained based on a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) on the second downlink component carrier.
2. The method of claim 1 , wherein the first PCI is obtained in a range of 0 to 503, and the extended PCI has a value greater than 503.
3. The method of claim 1 , wherein obtaining the extended PCI comprises:
obtaining a second PCI for the second downlink component carrier based on the PSS and the SSS on the second downlink component carrier; and
obtaining the extended PCI based on the second PCI.
4. The method of claim 3 , wherein the extended PCI is a value in which an offset has been added to the second PCI.
5. The method of claim 3 , wherein the first PCI and the second PCI are same.
6. The method of claim 1 , wherein the extended PCI is a value in which an offset has been added to the first PCI.
7. The method of claim 1 , wherein the extended PCI is used to transmit a reference signal of an uplink carrier linked to the second component carrier.
8. The method of claim 1 , wherein the extended PCI is used to transmit an uplink channel of an uplink carrier linked to the second downlink component carrier.
9. A user equipment for performing a cell search in a multiple carrier system, the user equipment comprising:
a radio frequency (RF) unit configured to transmit and receive radio signals; and
a processor coupled to the RF unit and configured to perform the cell search,
wherein the processor is configured to:
obtain a first physical cell identity (PCI) for a first downlink component carrier; and
obtain an extended PCI for a second downlink component carrier,
wherein a first downlink reference signal through the first downlink component carrier is transmitted based on the first PCI, and a second downlink reference signal through the second downlink component carrier is transmitted based on the extended PCI, and
wherein the extended PCI is obtained based on a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) on the second downlink component carrier.
10. The user equipment of claim 9 , wherein the first PCI is obtained in a range of 0 to 503, and the extended PCI has a value greater than 503.
11. The user equipment of claim 9 , wherein the processor is further configured to:
obtain a second PCI for the second downlink component carrier based on the PSS and the SSS on the second downlink component carrier; and
obtain the extended PCI based on the second PCI.
12. The user equipment of claim 11 , wherein the extended PCI is a value in which an offset has been added to the second PCI.
13. The user equipment of claim 11 , wherein the first PCI and the second PCI are identical with each other.
14. The user equipment of claim 9 , wherein the extended PCI is a value in which an offset has been added to the first PCI.
15. The user equipment of claim 9 , wherein the extended PCI is used to transmit a reference signal of an uplink carrier linked to the second downlink component carrier.
16. The user equipment of claim 9 , wherein the extended PCI is used to transmit an uplink channel of an uplink carrier linked to the second downlink component carrier.