Method and apparatus for transmitting uplink signal in wireless communication system

• US 9,401,790 B2
• Filed: 02/20/2013
• Issued: 07/26/2016
• Est. Priority Date: 02/20/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Jonghyun, Kim, Kijun, Kim, Byounghoon
• Primary Examiner(s): KHIRODHAR, MAHARISHI V
• Application Number:
  US14/376,829
• Publication Number:
  US 20150036607A1
• Time in Patent Office: 1,252 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0012 Hopping in multicarrier systems for frequency hopping in spread spectrum systems H04B1/713
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

A method for transmitting an uplink signal at a UE in a wireless communication system includes, when a virtual cell ID for a reference signal for demodulation of a physical uplink channel is provided, generating a sequence of the reference signal on the basis of the virtual cell ID, and transmitting the generated reference signal to an eNB. A sequence hopping pattern of the reference signal can be determined on the basis of the virtual cell ID.

Claims

1. A method for transmitting an uplink signal at a user equipment (UE) in a wireless communication system, the method comprising:

when a virtual identity (ID), n_ID^PUSCH, for a reference signal for demodulation of a physical uplink shared channel (PUSCH) is provided, generating the reference signal by the UE based on n_ID^PUSCH; and

transmitting, by the UE, the generated reference signal,

wherein, when n_ID^PUSCH is provided, a pseudo-random sequence generator used to determine sequence hopping of the reference signal is initialized according to

2. The method according to claim 1, wherein the sequence hopping is applied when sequence group hopping for the reference signal is disabled.

3. The method according to claim 1, wherein the sequence hopping is applied when a length of the reference signal satisfies M_sc^RS≧

6N_sc^RB,

wherein M_sc^RS denotes the length of the reference signal and is defined as M_sc^RS=m·

N_sc^RB,

wherein 1≦

m≦

N_RB^max,UL

wherein N_RB^max,UL represents a maximum uplink bandwidth configuration and is expressed by an integer multiple of N_sc^RB, and

wherein N_sc^RB is a resource block size and is represented by a number of subcarriers.

4. The method according to claim 1, wherein a base sequence number of the reference signal in a base sequence group of the reference signal is determined according to the sequence hopping.

5. The method according to claim 1,

wherein, when n_ID^PUSCH is not provided, the pseudo-random sequence generator used to determine the sequence hoping of the reference signal is initialized according to

6. The method according to claim 1, wherein n_ID^PUSCH is set to a value making a base sequence of the reference signal for the UE identical to a base sequence for other UE which is paired with the UE for a multiple user multiple input multiple output (MU-MIMO).

7. The method according to claim 1, wherein the reference signal is transmitted on one single carrier frequency division multiple access (SC-FDMA) symbol in a slot in which the PUSCH is transmitted.

8. A user equipment (UE) for transmitting an uplink signal, comprising:

a receiver;

a transmitter; and

a processor configured to control the receiver and the transmitter, the processor configured to;

when a virtual cell identity (ID) n_ID^PUSCH for a reference signal for demodulation of a physical uplink shared channel (PUSCH) is provided, generate the reference signal based on n_ID^PUSCH ; and

control the transmitter to transmit the generated reference signal sequence

wherein, when n_ID^PUSCH is provided, a pseudo-random sequence generator used to determine sequence hopping of the reference signal is initialized according to

9. The UE according to claim 8, wherein the sequence hopping is applied when sequence group hopping for the reference signal is disabled.

10. The UE according to claim 8,

wherein the sequence hoping is applied when a length of the reference signal satisfies M_sc^RS ≧

6N_sc^RB,

wherein M_sc^RS denotes the length of the reference signal and is defined as M_sc^RS =m·

N_sc^RB

wherein 1≦

m≦

N_RB^max,UL,

wherein N_RB^max,UL represents a maximum uplink bandwith configuration and is expressed by an interger multiple of N_sc^RB, and

wherein N_sc^RBis a resource block size and is represented by a number of subcarriers.

11. The UE according to claim 8, wherein a base sequence number of the reference signal in a base sequence group of the reference signal is determined according to the sequence hopping.

12. The UE according to claim 8,

wherein, when N_ID^PUSCH is not provided, the pseudo-random sequence generator used to determine the sequence hopping of the reference signal is initialized according to