METHOD BY WHICH TERMINALS IN WIRELESS COMMUNICATION SYSTEMS RECEIVE DOWNLINK CONTROL CHANNELS AND APPARATUS FOR SAME

• US 20150055485A1
• Filed: 01/04/2013
• Published: 02/26/2015
• 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, Seo, Inkwon, Lee, Seungmin, Kim, Hakseong, Seo, Hanbyul
• Granted Patent: US 9,730,185 B2
• Time in Patent Office: Days
• US Class Current: 370/242
• 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 in a wireless communication system, the method comprising:

receiving control information containing information on a transmission mode for the control channel and the number of antenna port from an eNode B via a broadcast channel; and

receiving the control channel based on the control information.

2. The method according to claim 1, wherein the control information corresponds to an MIB (master information block) and wherein the information on the transmission mode and the number of antenna port is contained in a spare bit of the MIB.

3. The method according to claim 1, wherein the broadcast channel is received in a plurality of frames, wherein the broadcast channel received via each of a plurality of the frames is masked by a CRC (cyclic redundancy check) indicating a specific value and wherein the information on the transmission mode and the number of antenna port is represented by a combination of specific values indicated by a CRC value masked on the broadcast channel which is received via each of a plurality of the frames.

4. The method according to claim 1, wherein the broadcast channel is masked by a CRC (cyclic redundancy check) indicating a specific value and wherein the information on the transmission mode and the number of antenna port is represented by a specific value which is indicated by a CRC value masked on the broadcast channel.

5. The method according to claim 1, wherein the transmission mode corresponds to one selected from the group consisting of a single antenna transmission scheme, an SFBC-based transmit diversity scheme and a precoder cycling-based RE level random beamforming scheme.

6. The method according to claim 1, wherein the number of antenna port corresponds to one selected from the group consisting of 1, 2 and 4.

7. The method according to claim 1, wherein the broadcast channel is received based on a cell-specific reference signal and wherein the control channel is received based on a UE-specific reference signal.

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

9. A user equipment in a wireless communication system, the user equipment comprising:

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

a processor configured to process the signal,

the processor configured to receive control information containing information on a transmission mode for a control channel and the number of antenna port from the eNode B via a broadcast channel, the processor configured to control the user equipment to receive the control channel based on the control information.

10. The user equipment according to claim 9, wherein the control information corresponds to an MIB (master information block) and wherein the information on the transmission mode and the number of antenna port is contained in a spare bit of the MIB.

11. The user equipment according to claim 9, wherein the broadcast channel is received in a plurality of frames, wherein the broadcast channel received via each of a plurality of the frames is masked by a CRC (cyclic redundancy check) indicating a specific value and wherein the information on the transmission mode and the number of antenna port is represented by a combination of specific values indicated by a CRC value masked on the broadcast channel which is received via each of a plurality of the frames.

12. The user equipment according to claim 9, wherein the broadcast channel is masked by a CRC (cyclic redundancy check) indicating a specific value and wherein the information on the transmission mode and the number of antenna port is represented by a specific value which is indicated by a CRC value masked on the broadcast channel.

13. The user equipment according to claim 9, wherein the transmission mode corresponds to one selected from the group consisting of a single antenna transmission scheme, an SFBC-based transmit diversity scheme and a precoder cycling-based RE level random beamforming scheme.

14. The user equipment according to claim 9, wherein the number of antenna port corresponds to one selected from the group consisting of 1, 2 and 4.

15. The user equipment according to claim 10, wherein if the transmission mode of the broadcast channel and the transmission mode of the control channel are identical to each other, a remaining field of the MIB is set to 0.