Method and apparatus for transmitting uplink reference signal in wireless communication system

• US 10,412,715 B2
• Filed: 10/05/2016
• Issued: 09/10/2019
• 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
• Primary Examiner(s): Wong, Warner
• Application Number:
  US15/286,166
• Publication Number:
  US 20170026955A1
• Time in Patent Office: 1,070 Days
• Field of Search: None
• 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

A method and a user equipment (UE) for transmitting a demodulation reference signal for a physical uplink shared channel (PUSCH) in a wireless communication system are discussed. The method according to an embodiment includes configuring a virtual cell identity (ID) which is different from a physical cell ID; generating a base sequence by using the virtual cell ID; obtaining a cyclic shift hopping pattern for each slot by using a UE-specific parameter; generating the demodulation reference signal for the PUSCH by using the base sequence and the cyclic shift hopping pattern for each slot; and transmitting the demodulation reference signal for the PUSCH to an eNodeB (eNB).

Claims

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

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

generating a base sequence based on the virtual cell ID;

receiving a UE-specific parameter from the network;

generating a value n_PN(n_s) based on a value c_init,

wherein the value n_PN(n_s) is used to determine a cyclic shift of the DMRS, wherein the value c_init is used to initialize a pseudo-random sequence which is used to determine the value n_PN(n_s), and wherein the value c_init is determined based on the UE-specific parameter;

generating the DMRS based on the base sequence and the cyclic shift; and

transmitting the DMRS to the network.

2. The method of claim 1, wherein the generating the base sequence based on the virtual cell ID comprises:

obtaining a sequence group number of the base sequence based on the virtual cell ID.

3. The method of claim 2, wherein the generating the base sequence based on the virtual cell ID further comprises:

obtaining a base sequence number of the base sequence based on the virtual cell ID.

4. The method of claim 1, wherein the UE-specific parameter relates to the virtual cell ID.

5. The method of claim 1, wherein the virtual cell ID is received via a higher layer.

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

a memory;

a transceiver; and

a processor that is coupled to the memory and the transceiver, and that;

controls the transceiver to receive a virtual cell identity (ID) which is different from a physical cell ID from a network,

generates a base sequence based on the virtual cell ID,

controls the transceiver to receive a UE-specific parameter from the network,

generates a value n_PN(n_s) based on a value c_init, wherein the value n_PN(n_s) is used to determine a cyclic shift of a demodulation reference signal (DMRS), wherein the value c_init is used to initialize a pseudo-random sequence which is used to determine the value n_PN(n_s), and wherein the value c_init is determined based on the UE-specific parameter,

generates the DMRS based on the base sequence and the cyclic shift, and

controls the transceiver to transmit the DMRS for the PUSCH to the network.

7. The UE of claim 6, wherein, to generate the base sequence based on the virtual cell ID, the processor obtains a sequence group number of the base sequence based on the virtual cell ID.

8. The UE of claim 7, wherein, to generate the base sequence based on the virtual cell ID further, the processor obtains a base sequence number of the base sequence based on the virtual cell ID.

9. The UE of claim 6, wherein the UE-specific parameter relates to the virtual cell ID.

10. The UE of claim 6, wherein the virtual cell ID is received via a higher layer.