Method for interference randomization of physical uplink control channel

• US 8,594,017 B2
• Filed: 12/05/2008
• Issued: 11/26/2013
• Est. Priority Date: 04/22/2008
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Xia, Shuqiang, Liang, Chunli, Dai, Bo, Hao, Peng
• Primary Examiner(s): Lee, Andrew
• Application Number:
  US12/988,584
• Publication Number:
  US 20110032926A1
• Time in Patent Office: 1,817 Days
• Field of Search: 370/328, 370/329, 370/337, 370/347
• US Class Current: 370/328
• CPC Class Codes: H04J 11/003 at the transmitter transmission to multiple receive units in multiple input multiple output [MIMO] H04B7/0452; transmit antenna weighting H04B7/0615
• CPC Class Codes: H04J 13/0059 CAZAC [constant-amplitude and zero auto-correlation]
• CPC Class Codes: H04J 13/0074 Code shifting or hopping
• CPC Class Codes: H04J 13/18 Allocation of orthogonal codes
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861

Abstract

A method for interference randomization of physical uplink control channel (PUCCH), which is used in long term evolution (LTE) system, when multiple terminals multiplex PUCCH to transmit uplink control signalings, the difference of index of control channel resource used by any two terminals in the first timeslot of PUCCH is different from the difference of index of control channel resource used by the two terminals in the second timeslot of PUCCH. The invention can realize interference randomization between UEs that multiplex the same PUCCH.

Claims

1. A method for interference randomization in a physical uplink control channel, comprising:

sending uplink control signalings in first and second timeslots of a sub-frame with different physical uplink control channel resources when a plurality of user equipments are multiplexed in the physical uplink control channel;

wherein difference of indexes of control channel resources used by any two user equipments in the first timeslot of the physical uplink control channel is different from that of indexes of control channel resources used by the two user equipments in the second timeslot.

2. A method of claim 1, wherein,

said physical uplink control channels only multiplexing the user equipments sending acknowledgement/non-acknowledgement messages, and when said user equipments send the acknowledgement/non-acknowledgement messages in the physical uplink control channels in the first and second timeslots of the sub-frame, orthogonal codes in time domain in use are the same while cyclic shifts of a constant amplitude zero auto correlation sequence are different, or the orthogonal codes in time domain in use are different while the cyclic shifts of the constant amplitude zero auto correlation sequence are the same, or both the orthogonal codes in time domain in use and the cyclic shifts of the constant amplitude zero auto correlation sequence are different.

3. A method of claim 2, wherein,

said user equipments sending the acknowledgement/non-acknowledgement messages in the control channel with a control channel resource index of i in the first timeslot and in the control channel with a control channel resource index of g(i, d, N) in the second timeslot, and the number of control channels provided for the user equipments sending the acknowledgement/non-acknowledgement messages in the first and second timeslots are N respectively and order thereof is the same, where, 0≦

i≦

N−

1,

g(i,d,N)=((i+1)×

d)mod(N+1)−

1

the value of N is c×

N_SC^RB/Δ

_shift^PUCCH, where,

c is the number of the orthogonal codes in time domain, and c is 3 when said physical uplink control channel uses a normal cyclic prefix and c is 2 when said physical uplink control channel uses an extended cyclic prefix;

N_SC^RB is the number of sub-carriers occupied by a resource block in which said control channel is located;

Δ

_shift^PUCCH is interval of the cyclic shifts of the constant amplitude zero auto correlation sequence in the same orthogonal code in time domain;

d is a natural number prime with N+1;

mod denotes modulo operation.

4. A method of claim 1, wherein,

said physical uplink controls channel only multiplexing the user equipments sending channel quality indicators, and when said user equipments send the channel quality indicators in the physical uplink control channels in the first and second timeslots of the sub-frame, cyclic shifts of a constant amplitude zero auto correlation sequence in use are different.

5. A method of claim 4, wherein,

said user equipments sending the channel quality indicators in the control channel with a control channel resource index of i in the first timeslot, and send the channel quality indicators in the control channel with a control channel resource index of g(i, c′

, N) in the second timeslot, and the number of the control channels for the user equipments sending the channel quality indicators in the first and second timeslots is N respectively and order thereof is the same, where, 0≦

i≦

N−

1,

g(i,c′

,N)=((i+1)×

c′

)mod(N+1)−

1

Where, N is the number of the cyclic shifts of the constant amplitude zero auto correlation sequence, that is, N=N_SC^RB, where N_SC^RB is the number of sub-carriers occupied by a resource block in which said control channels are located;

c′

is a natural number prime with N+1;

mod denotes modulo operation.

6. A method of claim 1, wherein,

said physical uplink control channels multiplexing both the user equipments sending acknowledgement/non-acknowledgement messages and the user equipments sending channel quality indicators, wherein, when said user equipments send the acknowledgement/non-acknowledgement messages in the physical uplink control channels in the first and second timeslots of a sub-frame, orthogonal codes in time domain in use are the same while cyclic shifts of a constant amplitude zero auto correlation sequence are different, or the orthogonal codes in time domain in use are different while the cyclic shifts of the constant amplitude zero auto correlation sequence are the same, or both the orthogonal codes in time domain in use and the cyclic shifts of the constant amplitude zero auto correlation sequence are different;

when said user equipments send channel quality indicators in the physical uplink control channels in the first and second timeslots of the sub-frame, cyclic shifts of a constant amplitude zero auto correlation sequence are different.

7. A method of claim 6, wherein,

the number of the cyclic shifts of the constant amplitude zero auto correlation sequence sending the acknowledgement/non-acknowledgement messages is N_SC⁽¹⁾, while that of the cyclic shifts of the constant amplitude zero auto correlation sequence sending the channel quality indicators is N_CS⁽²⁾;

said user equipments sending the acknowledgement/non-acknowledgement messages send the acknowledgement/non-acknowledgement messages in a control channel with a control channel resource index i in the first timeslot, and in the control channel with a control channel resource index of g1(i, d, N) in the second timeslot, and the number of the control channels for the user equipments sending the acknowledgement/non-acknowledgement messages in the first and second timeslots is N respectively and order thereof is the same, 0≦

i≦

N−

1, where,

g(i,d,N)=((i+1)×

d)mod(N+1)−

1

the value of N is c×

N_SC⁽¹⁾/Δ

_shift^PUCCH, where, Δ

_shift^PUCCH is interval of the cyclic shifts of the constant amplitude zero auto correlation sequence in the same orthogonal code in time domain;

c is the number of orthogonal codes in time domain, and c is 3 when said physical uplink control channel uses a normal cyclic prefix and c is 2 when said physical uplink control channel uses an extended cyclic prefix;

d is a natural number prime with N+1;

mod denotes modulo operation;

said user equipments sending the channel quality indicators send the channel quality indicators in the control channel with a control channel resource index j in the first timeslot and send the channel quality indicators in the control channels with a control channel resource index of g2(j,c′

,N_CS⁽²⁾) in the second timeslot, and the number of control channels for the user equipments sending the channel quality indicators in the first and second timeslots is N_CS⁽²⁾ respectively and order thereof is the same, 0≦

j≦

N_CS⁽²⁾−

1, where,

g2(j,c′

,N_CS⁽²⁾)=((j+1)*c′

)mod(N_CS⁽²⁾+1)−

1

c′

is a natural number prime with N_CS⁽²⁾+1;

mod denotes modulo operation.

8. A method of claim 7, wherein,

N_CS⁽²⁾=N_CS^RB−

2−

N_CS⁽¹⁾, and N_S^RB is the number of sub-carriers occupied by a resource block in which said control channels are located.

9. A method of claim 3, wherein, the value of d is the number of orthogonal codes in time domain, that is, d=c.

10. A method of claim 5, wherein, the value of c′

is the number of the cyclic shifts of the constant amplitude zero auto correlation sequence for sending the channel quality indicators in the control channels, that is, c′

=N_CS^RB or c′

=N_CS⁽²⁾.

13. A method of claim 7, wherein, the value of d is the number of orthogonal codes in time domain, that is, d=c.

14. A method of claim 7, wherein, the value of c′

is the number of the cyclic shifts of the constant amplitude zero auto correlation sequence for sending the channel quality indicators in the control channels, that is, c′

=N_SC^RB or c′

=N_CS⁽²⁾.

11. A method for interference randomization in a physical uplink control channel, applied in long term evolution system, comprising:

user equipments sending acknowledgement/non-acknowledgement messages in a control channel with a control channel resource index of i in the first timeslot and in a control channel with a control channel resource index of g(i, d, N) in the second timeslot, and

g(i,d,N)=((i+1)×

d)mod(N+1)−

1

in the equation, 0≦

i≦

N−

1, N=c×

N_SC^RB/Δ

_shift^PUCCH, where, c is the number of orthogonal codes in time domain, N_SC^RB is the number of sub-carriers occupied by one resource block;

Δ

_shift^PUCCH is interval of cyclic shifts of a constant amplitude zero auto correlation sequence in the same orthogonal code in time domain;

d is a natural number prime with N+1;

mod denotes modulo operation.

12. A method of claim 11, wherein,

c is 3 when said physical uplink control channel uses a normal cyclic prefix, and c is 2 and d=c when said physical uplink control channel uses an extended cyclic prefix.