Method and apparatus for transmitting uplink signal in wireless communication system

• US 10,237,859 B2
• Filed: 07/13/2017
• Issued: 03/19/2019
• 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, Seo, Hanbyul, Kim, Kijun, Kim, Byounghoon
• Primary Examiner(s): Kamara, Mohamed A
• Application Number:
  US15/648,883
• Publication Number:
  US 20170311313A1
• Time in Patent Office: 614 Days
• CPC Class Codes: H04B 1/7143 Arrangements for generation of hop patterns
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• 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
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting an uplink signal. 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 group hopping pattern of the reference signal can be determined on the basis of the virtual cell ID.

Claims

1. A method for transmitting, by a user equipment, an uplink signal, the method comprising:

generating, by the user equipment, a reference signal (PUSCH RS) for demodulation of a physical uplink shared channel (PUSCH) carrying data of the user equipment; and

transmitting, by the user equipment, the PUSCH and the PUSCH RS,

wherein the PUSCH RS is generated from a base sequence with a base sequence number v in a base sequence group with a sequence group number u among a plurality of base sequence groups, each of which consists of one or more base sequences,

wherein the sequence group number u of the base sequence for the PUSCH RS is determined by a group hopping pattern f_gh and a sequence-shift pattern f_ss^PUSCH according to u=(f_gh+f_ss^PUSCH)mod30,

wherein the base sequence for the PUSCH RS is determined using a first virtual cell ID n_ID^PUSCH, when the first virtual cell ID n_ID^PUSCH for the PUSCH is provided,

wherein, when the first virtual cell ID n_ID^PUSCH is provided and when group hopping is enabled and sequence hopping is disabled, a pseudo-random generator used to determine the group hopping pattern f_gh is initialized at a start of each radio frame according to

2. The method according to claim 1, wherein the base sequence for the PUSCH RS is determined using a physical cell ID, N_ID^cell□

{0, . . . , 503 }, when the first virtual cell ID n_ID^PUSCH is not provided,

wherein when the first virtual cell ID n_ID^PUSCH is not provided and when group hopping is enabled and sequence hopping is disabled, the pseudo-random generator used to determine the group hopping pattern f_gh is initialized at the start of each radio frame according to

3. The method according to claim 1, wherein the PUSCH RS is generated from a cyclic shift of the base sequence, and

wherein the cyclic shift is determined using a pseudo-random sequence generator used to determine cyclic shift hopping for the PUSCH RS based on a second virtual cell ID N_ID^csh_DMRS when the second virtual cell ID N_ID^csh_DMRS for the PUSCH is provided, and

wherein, when the second virtual cell ID N_ID^csh_DMRS is provided, the pseudo-random sequence generator used to determine cyclic shift hopping is initialized according to

4. The method according to claim 3, wherein the cyclic shift is determined using the pseudo-random sequence generator used to determine cyclic shift hopping for the PUSCH RS based on a physical cell ID, N_ID^cell□

{0, . . . , 503 }, when the second virtual cell ID N_ID^csh_^DMRS for the PUSCH is not provided, and

wherein, when N_ID^csh_DMRS is not provided, the pseudo-random sequence generator used to determine cyclic shift hopping is initialized according to

5. A user equipment for transmitting an uplink signal, the user equipment comprising:

a receiver,

a transmitter, and

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

generate a reference signal (PUSCH RS) for demodulation of a physical uplink shared channel (PUSCH) carrying data of the user equipment; and

control the transmitter to transmit the PUSCH and the PUSCH RS,

wherein the PUSCH RS is generated from a base sequence with a base sequence number v in a base sequence group with a sequence group number u among a plurality of base sequence groups, each of which consists of one or more base sequences,

wherein the sequence group number u of the base sequence for the PUSCH RS is determined by a group hopping pattern f_gh and a sequence-shift pattern f_ss^PUSCH according to u=(f_gh+f_ss^PUSCH)mod30,

wherein the base sequence for the PUSCH RS is determined using a first virtual cell ID n_ID^PUSCH, when the first virtual cell ID n_ID^PUSCH for the PUSCH is provided,

wherein, when the first virtual cell ID n_ID^PUSCH is provided and when group hopping is enabled and sequence hopping is disabled, a pseudo-random generator used to determine the group hopping pattern f_gh is initialized at a start of each radio frame according to

6. The user equipment according to claim 5, wherein the base sequence for the PUSCH RS is determined using a physical cell ID, N_ID^cell□

{0, . . . , 503}, when the first virtual cell ID n_ID^PUSCH is not provided,

wherein when the first virtual cell ID n_ID^PUSCH is not provided and when group hopping is enabled and sequence hopping is disabled, the pseudo-random generator used to determine the group hopping pattern f_gh is initialized at the start of each radio frame according to

7. The user equipment according to claim 5, wherein the PUSCH RS is generated from a cyclic shift of the base sequence, and

wherein the cyclic shift is determined using a pseudo-random sequence generator used to determine cyclic shift hopping for the PUSCH RS based on a second virtual cell ID N_ID^csh_DMRS when the second virtual cell ID N_ID^csh_DMRS for the PUSCH is provided, and

wherein, when the second virtual cell ID N_ID^csh_DMRS is provided, the pseudo-random sequence generator used to determine cyclic shift hopping is initialized according to

8. The user equipment according to claim 7, wherein the cyclic shift is determined using the pseudo-random sequence generator used to determine cyclic shift hopping for the PUSCH RS based on a physical cell ID, N_ID^cell□

{0, . . . , 503}, when the second virtual cell ID N_ID^csh_DMRS for the PUSCH is not provided, and

wherein, when N_ID^csh_DMRS is not provided, the pseudo-random sequence generator used to determine cyclic shift hopping is initialized according to