Method and apparatus for allocating control channel in wireless communication system

• US 9,544,107 B2
• Filed: 10/26/2012
• Issued: 01/10/2017
• Est. Priority Date: 10/26/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chun, Jin Young, Ihm, Bin Chul, Kang, Ji Won, Kim, Ki Tae, Park, Sung Ho, Kim, Su Nam
• Primary Examiner(s): Harper, Kevin C
• Assistant Examiner(s): Baron, Henry
• Application Number:
  US14/353,474
• Publication Number:
  US 20140293957A1
• Time in Patent Office: 1,537 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04B 7/0684 using different training sequences per antenna
• CPC Class Codes: H04L 1/0046 Code rate detection or code type detection H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 5/0039 Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
• CPC Class Codes: H04L 5/0041 Frequency-non-contiguous
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

Provided are a method and an apparatus for allocating a control channel in a wireless communication system. A base station allocates an enhanced physical downlink control channel (e-PDCCH) to a localized region within a physical downlink shared channel (PDSCH) region, allocates the e-PDCCH to a distributed region within the PDSCH region, and transmits a scheduling assignment via the allocated e-PDCCH.

Claims

1. A method for allocating a control channel in a wireless communication system, the method comprising:

allocating an enhanced physical downlink control channel (e-PDCCH); and

transmitting a scheduling assignment through the allocated e-PDCCH,

wherein the allocating the e-PDCCH comprises;

when an enhanced control channel element (CCE) aggregation level of a corresponding e-PDCCH format is below a predetermined value, allocating the e-PDCCH to a localized region which is contiguously configured in a frequency domain, or a distributed region which is dispersedly configured in the frequency domain; and

when the e-CCE aggregation level is not below the predetermined value, allocating the e-PDCCH to only to the distributed region.

2. The method of claim 1,

wherein the localized region is a region in which an e-PDCCH of a minimum aggregation level is transmitted from a physical resource block (PRB) or a pair of PRBs, and

wherein the distributed region is a region in which an e-PDCCH of the minimum aggregation level is transmitted from a plurality of PRBs or pairs of PRBs in distributed manner.

3. The method of claim 1,

wherein the localized region is a region in which a part of e-PDCCH antenna ports is used among N number of e-PDCCH antenna ports given to an e-PDCCH aggregation region, and

wherein the distributed region is a region in which the whole N number of e-PDCCH antenna ports are used.

4. The method of claim 1,

wherein the localized region is a region in which a control channel element (CCE)/an enhanced CCE (e-CCE) is configured or mapped to a RB or a pair of RBs, and

wherein the distributed region is a region in which the CCE/e-CCE is divided and configured or mapped to a plurality of RBs.

5. The method of claim 1,

wherein the localized region is a region in which a search space of the e-PDCCH is configured or mapped to a continuous RB or a continuous pair of RBs, and

wherein the distributed region is a region in which the search space of the e-PDCCH is configured or mapped to a distributed RB or a distributed pair of RBs.

6. The method of claim 1,

wherein the localized region is a region to which e-PDCCHs of a plurality of UEs are allocated without being interleaved, and

wherein the distributed region is a region to which e-PDCCHs of the plurality of UEs are allocated with being interleaved.

7. The method of claim 6, wherein the e-PDCCH of each of the plurality of UEs includes a plurality of units in the distributed region.

8. The method of claim 7, wherein each of the plurality of units is configured along with a frequency domain in a PRB, or configured along with a time domain and a frequency domain in a PRB.

9. The method of claim 1, wherein an aggregation level of the e-PDCCH which is allocated to the distributed region is higher than an aggregation level of an e-PDCCH which is allocated to the localized region.

10. The method of claim 1, wherein the scheduling assignment is transmitted through a common search space (CSS) of the e-PDCCH which is allocated to the distributed region.

11. The method of claim 10, wherein the scheduling assignment includes a common radio network temporary identity (RNTI).

12. The method of claim 10, wherein the scheduling assignment which is transmitted through the e-PDCCH allocated to the distributed region is a downlink control information (DCI) format 1A.

14. The method of claim 1,

wherein the localized region is a region in which the e-PDCCH is allocated only to one physical resource block (PRB) or a PRB pair,

wherein the distributed region is a region in which the e-PDCCH is allocated to multiple PRBs or multiple PRB pairs.

13. A base station for allocating a control channel in a wireless communication system, the base station comprising:

a radio frequency (RF) unit for transmitting or receiving a radio signal; and

a processor connected to the RF unit, and configured to;

allocate an enhanced physical downlink control channel (e-PDCCH); and

transmit a scheduling assignment through the allocated e-PDCCH,

wherein the processor is configured to allocate the e-PDCCH by an allocation process that comprises;

when an enhanced control channel element (CCE) aggregation level of a corresponding e-PDCCH format is below a predetermined value, allocating the e-PDCCH to a localized region which is contiguously configured in a frequency domain, or a distributed region which is dispersedly configured in the frequency domain; and

when the e-CCE aggregation level is not below the predetermined value, allocating the e-PDCCH to only to the distributed region.

15. The base station of claim 13,

wherein the localized region is a region in which the e-PDCCH is allocated only to one physical resource block (PRB) or a PRB pair,

wherein the distributed region is a region in which the e-PDCCH is allocated to multiple PRBs or multiple PRB pairs.