Method for transmitting an uplink reference signal in a multi-node system and terminal using same

Patent metadata

Field	Value
Publication number	US-9350397-B2
Application number	US-201214234963-A
Country	US
Kind code	B2
Filing date	Jul 27, 2012
Priority date	Jul 27, 2011
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

The present invention relates to a method for transmitting an uplink reference signal in a multi-node system and a terminal using same. The method comprises the steps of: receiving a synchronization signal from a node; receiving parameters for a virtual cell identifier (ID) from the node; generating an uplink demodulation reference signal (DM-RS) using the parameters for the virtual cell ID; and transmitting the generated uplink DM-RS to the node, wherein a physical cell ID is a cell ID obtained from the synchronization signal, and the parameters for the virtual cell ID are parameters used for generating the uplink DM-RS in the replacement of the physical cell ID.

First claim

What is claimed is:

1. A method of transmitting an uplink reference signal, performed by a user equipment, the method comprising:
receiving synchronization signals including a primary synchronization signal and a secondary synchronization signal;
transmitting an uplink reference signal generated based on a physical cell identity (ID) which is determined by the synchronization signals;
when a value for a virtual cell ID is configured by a higher layer signal, replacing the physical cell ID by the virtual cell ID and transmitting an uplink reference signal based on the virtual cell ID, wherein the uplink reference signal based on the virtual cell ID is a demodulation reference signal which is associated with a physical uplink shared channel (PUSCH); and
when the uplink reference signal based on the virtual cell ID is transmitted in two slots in a subframe in time domain, selecting one sequence group in each of the two slots and generating the uplink reference signal based on the virtual cell ID by cyclically shifting one base sequence selected in the selected sequence group,
wherein the one base sequence selected in each of the two slots is determined based on the virtual cell ID.

2. The method of claim 1 , wherein the virtual cell ID is received through a radio resource control (RRC) message.

3. The method of claim 1 , wherein the uplink reference signal based on the virtual cell ID is transmitted at a fourth and an eleventh single carrier-frequency division multiple access (SC-FDMA) symbols in an uplink subframe including 14 SC-FDMA symbols.

4. The method of claim 1 , wherein the uplink reference signal based on the virtual cell ID is transmitted at a third and a ninth single carrier-frequency division multiple access (SC-FDMA) symbols in an uplink subframe including 12 SC-FDMA symbols.

5. A method of receiving an uplink reference signal, performed by a base station, the method comprising:
transmitting synchronization signals including a primary synchronization signal and a secondary synchronization signal; and
receiving an uplink reference signal generated based on a physical cell identity (ID) which is determined by the synchronization signals;
when a value for a virtual cell ID is configured by a higher layer signal, replacing the physical cell ID by the virtual cell ID and receiving an uplink reference signal based on the virtual cell ID, wherein the uplink reference signal based on the virtual cell ID is a demodulation reference signal which is associated with a physical uplink shared channel (PUSCH); and
when the uplink reference signal based on the virtual cell ID is received in two slots in a subframe in time domain, selecting one sequence group in each of the two slots and generating the uplink reference signal based on the virtual cell ID by cyclically shifting one base sequence selected in the selected sequence group,
wherein the one base sequence selected in each of the two slots is determined based on the virtual cell ID.

6. The method of claim 5 , wherein the virtual cell ID is transmitted through a radio resource control (RRC) message.

7. The method of claim 5 , wherein the uplink reference signal based on the virtual cell ID is received at a fourth and an eleventh single carrier-frequency division multiple access (SC-FDMA) symbols in an uplink subframe including 14 SC-FDMA symbols.

8. The method of claim 5 , wherein the uplink reference signal based on the virtual cell ID is received at a third and a ninth single carrier-frequency division multiple access (SC-FDMA) symbols in an uplink subframe including 12 SC-FDMA symbols.

9. A user equipment (UE) for transmitting an uplink reference signal, the UE comprising:
a radio frequency (RF) unit configured to transmit and receive a radio signal; and
a processor coupled to the RF unit and configured to:
receive synchronization signals including a primary synchronization signal and a secondary synchronization signal,
transmit an uplink reference signal generated based on a physical cell identity (ID) which is determined by the synchronization signals,
when a value for a virtual cell ID is configured by a higher layer signal, replace the physical cell ID by the virtual cell ID and transmit an uplink reference signal based on the virtual cell ID, wherein the uplink reference signal based on the virtual cell ID is a demodulation reference signal which is associated with a physical uplink shared channel (PUSCH), and
when the uplink reference signal based on the virtual cell ID is transmitted in two slots in a subframe in time domain, select one sequence group in each of the two slots and generate the uplink reference signal based on the virtual cell ID by cyclically shifting one base sequence selected in the selected sequence group,

wherein the one base sequence selected in each of the two slots is determined based on the virtual cell ID.

10. The UE of claim 9 , wherein the virtual cell ID is received through a radio resource control (RRC) message.

11. The UE of claim 9 , wherein the uplink reference signal based on the virtual cell ID is transmitted at a fourth and an eleventh single carrier-frequency division multiple access (SC-FDMA) symbols in an uplink subframe including 14 SC-FDMA symbols.

12. The UE of claim 9 , wherein the uplink reference signal based on the virtual cell ID is transmitted at a third and a ninth single carrier-frequency division multiple access (SC-FDMA) symbols in an uplink subframe including 12 SC-FDMA symbols.

13. A base station (BS) for receiving an uplink reference signal, the BS comprising:
a radio frequency (RF) unit configured to transmit and receive a radio signal; and
a processor coupled to the RF unit and configured to:
transmit synchronization signals including a primary synchronization signal and a secondary synchronization signal,
receive an uplink reference signal generated based on a physical cell identity (ID) which is determined by the synchronization signals,
when a value for a virtual cell ID is configured by a higher layer signal, replace the physical cell ID by the virtual cell ID and receive an uplink reference signal based on the virtual cell ID, wherein the uplink reference signal based on the virtual cell ID is a demodulation reference signal which is associated with a physical uplink shared channel (PUSCH), and
when the uplink reference signal based on the virtual cell ID is received in two slots in a subframe in time domain, select one sequence group in each of the two slots and generate the uplink reference signal based on the virtual cell ID by cyclically shifting one base sequence selected in the selected sequence group,

wherein the one base sequence selected in each of the two slots is determined based on the virtual cell ID.

14. The BS of claim 13 , wherein the virtual cell ID is transmitted through a radio resource control (RRC) message.

15. The BS of claim 13 , wherein the uplink reference signal based on the virtual cell ID is received at a fourth and a eleventh an eleventh single carrier-frequency division multiple access (SC-FDMA) symbols in an uplink subframe including 14 SC-FDMA symbols.

16. The BS of claim 13 , wherein the uplink reference signal based on the virtual cell ID is received at a third and a ninth single carrier-frequency division multiple access (SC-FDMA) symbols in an uplink subframe including 12 SC-FDMA symbols.

Assignees

• Kang Ji Won
• Chun Jin Young
• Noh Min Seok
• Kim Ki Tae
• Kim Su Nam
• Ihm Bin Chul
• Park Sung Ho
• Lg Electronics Inc

Inventors

• Kang Ji Won
• Chun Jin Young
• Noh Min Seok
• Kim Ki Tae
• Kim Su Nam
• Ihm Bin Chul
• Park Sung Ho

Classifications

• H04W72/21 Primary

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04L5/001

  the frequencies being arranged in component carriers · CPC title

• H04B1/10 Primary

  Means associated with receiver for limiting or suppressing noise or interference · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04L23/02

  adapted for orthogonal signalling · CPC title