Method by which terminals in wireless communication systems receive downlink control channels and apparatus for same

• US 9,730,185 B2
• Filed: 01/04/2013
• Issued: 08/08/2017
• Est. Priority Date: 02/23/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Myoungseob, Kim, Hakseong, Seo, Inkwon, Lee, Seungmin, Seo, Hanbyul
• Primary Examiner(s): Taha, Shaq
• Assistant Examiner(s): Davis, Ronald H
• Application Number:
  US14/372,121
• Publication Number:
  US 20150055485A1
• Time in Patent Office: 1,677 Days
• Field of Search: None
• 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 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/30 Resource management for broadcast services

Abstract

The present invention relates to a method by which terminals in a wireless communication system receive control channels. More particularly, the method includes the steps of: receiving control information that includes the transmission mode for the control channel and information about the number of antenna ports through a broadcast channel from a base station; and receiving the control channel on the basis of the control information.

Claims

1. A method of receiving a control channel, which is received by a user equipment (UE) in a wireless communication system, the method comprising:

receiving a physical broadcast channel (PBCH) in 4 frames from an eNodeB;

determining a transmission mode and a number of antenna ports based on a combination of a first cyclic redundancy check (CRC) masked to the PBCH in a first frame among the 4 frames and a second CRC masked to the PBCH in a second frame among the 4 frames; and

receiving the control channel based on the determined transmission mode and the determined number of antenna ports.

2. The method according to claim 1, wherein the PBCH includes a master information block (MIB).

3. The method according to claim 2, wherein if the transmission mode of the PBCH and the transmission mode of the control channel are identical to each other, a remaining field of the MIB is set to 0.

4. The method according to claim 1, wherein the transmission mode corresponds to one selected from a group consisting of a single antenna transmission scheme, a space frequency block code (SFBC)-based transmit diversity scheme and a precoder cycling-based resource element (RE) level random beamforming scheme.

5. The method according to claim 1, wherein the number of antenna ports is 1, 2 or 4.

6. The method according to claim 1, wherein the PBCH is received based on a cell-specific reference signal, and

wherein the control channel is received based on a UE-specific reference signal.

7. A user equipment (UE) in a wireless communication system, the UE comprising:

a wireless communication module configured to receive a signal from an eNode B; and

a processor configured to;

control the wireless communication module to receive a physical broadcast channel (PBCH) in 4 frames from the eNode B,

determine a transmission mode and a number of antenna ports based on a combination of a first cyclic redundancy check (CRC) masked to the PBCH in a first frame among the 4 frames and a second CRC masked to the PBCH in a second frame among the 4 frames, and

control the wireless communication module to receive a control channel based on the determined transmission mode and the determined number of antenna ports.

8. The UE according to claim 7, wherein the PBCH includes a master information block (MIB).

9. The UE according to claim 8, wherein if the transmission mode of the PBCH and the transmission mode of the control channel are identical to each other, a remaining field of the MIB is set to 0.

10. The UE according to claim 7, wherein the transmission mode corresponds to one selected from a group consisting of a single antenna transmission scheme, a space frequency block code (SFBC)-based transmit diversity scheme and a precoder cycling-based resource element (RE) level random beamforming scheme.

11. The UE according to claim 7, wherein the number of antenna ports is 1, 2 or 4.

12. The UE according to claim 7, wherein the PBCH is received by the wireless communication module based on a cell-specific reference signal, and

wherein the control channel is received by the wireless communication module based on a UE-specific reference signal.