METHOD AND APPARATUS FOR TRANSMITTING UPLINK REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM

• US 20140211736A1
• Filed: 08/16/2012
• Published: 07/31/2014
• Est. Priority Date: 08/16/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Noh, Min Seok, Chung, Jae Hoon, Ko, Hyun Soo
• Granted Patent: US 9,497,734 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04L 27/261 Details of reference signals
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 56/0005 synchronizing of arrival of multiple uplinks
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

Provided are a method and an apparatus for transmitting an uplink (UL) reference signal (RS) in a wireless communication system. A first user equipment (UE) served through a macro eNodeB (eNB) generates a first UL RS on the basis of a first indicator and transmits the generated first UL RS. A second UE served through a pico eNB having the same cell identifier (ID) as the macro eNB generates a second UL RS on the basis of a second indicator and transmits the generated second UL RS. The bandwidth to which the first UL RS is transmitted is overlapped with the bandwidth to which the second UL RS is transmitted.

Claims

1-15. -15. (canceled)

16. A method for transmitting, by a user equipment (UE), a reference signal in a wireless communication system, the method comprising:

configuring a virtual cell identity (ID) which is different from a physical cell ID;

obtaining a sequence group number of a base sequence by using the virtual cell ID;

generating the base sequence by using the sequence group number; and

transmitting a reference signal, which is generated by using the base sequence, to an eNodeB (eNB).

17. The method of claim 16, wherein the obtaining the sequence group number comprises:

generating a first pseudo-random sequence which is initialized by using the virtual cell ID;

obtaining a group hopping pattern by using the first pseudo-random sequence;

obtaining a sequence shift pattern by using the virtual cell ID; and

obtaining the sequence group number by using the group hopping pattern and the sequence shift pattern.

18. The method of claim 17, wherein the first pseudo-random sequence is initialized with

19. The method of claim 16, further comprising:

obtaining a base sequence number of the base sequence by using the virtual cell ID, wherein the base sequence is generated further by using the base sequence number.

20. The method of claim 19, wherein the obtaining the base sequence number comprises:

generating a second pseudo-random sequence which is initialized by using the virtual cell ID; and

obtaining the base sequence number by using the second pseudo-random sequence.

21. The method of claim 20, wherein the second pseudo-random sequence is initialized with

22. The method of claim 16, wherein the virtual cell ID is configured by a higher layer from the eNB.

23. The method of claim 16, wherein the reference signal is a demodulation reference signal for a physical uplink shared channel (PUSCH).

24. The method of claim 23, wherein the demodulation reference signal for the PUSCH is generated by using a cyclic shift hopping pattern for each slot.

25. The method of claim 24, wherein the cyclic shift hopping pattern for each slot is obtained by using the virtual cell ID.

26. The method of claim 25, wherein the obtaining the cyclic shift hopping pattern for each slot comprises:

generating a third pseudo-random sequence which is initialized by using the virtual cell ID; and

obtaining the cyclic shift hopping pattern for each slot by using the third pseudo-random sequence.

27. The method of claim 16, wherein the reference signal is a demodulation reference signal for a physical uplink control channel (PUCCH).

28. The method of claim 16, wherein the reference signal is a sounding reference signal (SRS).

29. The method of claim 16, wherein the eNB is either a macro eNB or a pico eNB.

30. A user equipment (UE) in a wireless communication system, the UE comprising:

a radio frequency (RF) unit for transmitting or receiving a radio signal; and

a processor coupled to the RF unit, and configured to;

configure a virtual cell identity (ID) which is different from a physical cell ID;

obtain a sequence group number of a base sequence by using the virtual cell ID;

generate the base sequence by using the sequence group number; and

transmit a reference signal, which is generated by using the base sequence, to an eNodeB (eNB).