Method for transceiving control information, and apparatus for same

• US 9,497,755 B2
• Filed: 10/07/2013
• Issued: 11/15/2016
• Est. Priority Date: 10/08/2012
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Myoungseob, Lee, Seungmin, Kim, Hakseong, Seo, Hanbyul
• Primary Examiner(s): Jung, Min
• Application Number:
  US14/430,485
• Publication Number:
  US 20150245324A1
• Time in Patent Office: 1,135 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04J 13/10 Code generation
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 25/03866 using scrambling
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states

Abstract

The present invention relates to a wireless communication system. In detail, provided are a method by which a terminal receives a control channel signal in a wireless communication system, and an apparatus for same, including the steps of: receiving a subframe including a plurality of control channel sets, wherein each control channel set includes a plurality of control channel candidates; and monitoring at least one control channel set in the subframe for receiving the control channel signal, wherein the plurality of control channel candidates are scrambled by a scrambling sequence having a control channel set-specific initialization value in each control channel set.

Claims

1. A method of receiving a control channel signal by a user equipment in a wireless communication system, the method comprising:

receiving a subframe containing a plurality of control channel sets, wherein each of a plurality of the control channel sets contains a plurality of control channel candidates; and

monitoring at least one control channel set in the subframe for receiving the control channel signal,

wherein a plurality of the control channel candidates in each of a plurality of the control channel sets are scrambled by a scrambling sequence, and an initialization value of the scrambling sequence is c_init of a following equation as an initialization value;

c_init=X·

2¹⁴+q·

2¹³+└

n_s/2┘

·

2⁹+ID_k 

 

Equation

where, X is to an integer containing 0, q is to an integer containing 0, n_s is a slot number in a radio frame, ID_k is identification information defined for a control channel set #k, and └

┘

is a flooring function.

2. The method of claim 1, wherein X=0 and q=0.

3. The method of claim 1, wherein the scrambling sequence c(n) is given by a following equation:

c(n)=(x₁(n+N_C)+x₂(n+N_C))mod 2

x₁(n+31)=(x₁(n+3)+x₁(n))mod 2

x₂(n+31)=(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod 2 

 

Equation

where, n=0, 1, . . . , MPN−

1, MPN is a sequence length, NC=1600, x1(0)=1, x1(n)=0, n=1, 2, . . . , 30, Σ

_i=0³⁰x₂(i)·

2ⁱ=c_init=X·

2¹⁴+q·

2¹³+└

n_s/2┘

·

2⁹+ID_k.

4. The method of claim 1, wherein the control channel signal is an E-PDCCH (enhanced physical downlink control channel) signal, the plurality of the control channel sets is a plurality of E-PDCCH sets, and the plurality of the control channel candidates is a plurality of E-PDCCH candidates.

5. The method of claim 1, wherein the monitoring comprises decoding each of the plurality of the control channel candidates in a corresponding control channel set using the scrambling sequence.

6. The method of claim 1, further comprising:

receiving an RRC (radio resource control) message containing RB (resource block) allocation information on each of the plurality of the control channel sets.

7. The method of claim 1, wherein the plurality of the control channel candidates is multiplexed with PDSCH (physical downlink shared channel) in the subframe using an FDM (frequency division multiplexing) scheme.

8. A user equipment configured to receive a control channel signal in a wireless communication system, comprising:

an RF (radio frequency) unit; and

a processor, the processor configured to receive a subframe containing a plurality of control channel sets, wherein each of a plurality of the control channel sets contains a plurality of control channel candidates, the processor configured to monitor at least one control channel set in the subframe for receiving the control channel signal,

wherein a plurality of the control channel candidates in each of a plurality of the control channel sets are scrambled by a scrambling sequence, and an initialization value of the scrambling sequence is c_init of a following equation as an initialization value;

c_init=X·

2¹⁴+q·

2¹³+└

n_s/2┘

·

2⁹+ID_k 

 

Equation

where, X is an integer containing 0, q is an integer containing 0, n_s is a slot number in a radio frame, ID_k is identification information defined for a control channel set #k, and └

┘

is a flooring function.

9. The user equipment of claim 8, wherein X=0 and q=0.

10. The user equipment of claim 8, wherein the scrambling sequence c(n) is given by a following equation:

c(n)=(x₁(n+N_C)+x₂(n+N_C))mod 2

x₁(n+31)=(x₁(n+3)+x₁(n))mod 2

x₂(n+31)=(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod 2 

 

Equation

where, n=0, 1, . . . , MPN−

1, MPN is a sequence length, NC=1600, x1(0)=1, x1(n)=0, n=1, 2, . . . , 30, and Σ

_i=0³⁰x₂(i)·

2ⁱ=c_init=X·

2¹⁴+q·

2¹³+└

n_s/2┘

·

2⁹+ID_k.

11. The user equipment of claim 8, wherein the control channel signal is an E-PDCCH (enhanced physical downlink control channel) signal, the plurality of the control channel sets is a plurality of E-PDCCH sets, and the plurality of the control channel candidates is a plurality of E-PDCCH candidates.

12. The user equipment of claim 8, wherein the monitoring comprises decoding each of the plurality of the control channel candidates in a corresponding control channel set using the scrambling sequence.

13. The user equipment of claim 8, wherein the processor is configured to receive an RRC (radio resource control) message containing RB (resource block) allocation information on each of the plurality of the control channel sets.

14. The user equipment of claim 8, wherein the plurality of the control channel candidates is multiplexed with PDSCH (physical downlink shared channel) in the subframe using an FDM (frequency division multiplexing) scheme.