METHOD AND APPARATUS FOR RECEIVING SYSTEM INFORMATION IN WIRELESS COMMUNICATION SYSTEM

• US 20150237602A1
• Filed: 09/23/2013
• Published: 08/20/2015
• Est. Priority Date: 09/18/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chae, Hyukjin, Seo, Hanbyul, Lee, Seungmin
• Granted Patent: US 9,769,812 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/08 at the receiving station
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The method for receiving system information by a terminal in a wireless communication system according to one embodiment of the present invention comprises: a step of receiving a subframe; and a step of performing, for a physical broadcast channel (PBCH) in a predetermined resource region of the subframe, blind decoding based on a plurality of sequences to be masked to a CRC parity bit. If a cell-specific reference signal (CRS) does not exist in the subframe, each of the plurality of sequences indicates pieces of individual information contained in one or more of a reference signal type set, a demodulation reference signal (DMRS) antenna port information set and diversity scheme information set.

Claims

1. A method for receiving system information at a user equipment (UE) in a wireless communication system, the method comprising:

receiving a subframe; and

performing blind decoding for a physical broadcast channel (PBCH) in a predetermined resource region of the subframe, based on a plurality of sequences masked on CRC parity bits,

wherein, when a cell-specific reference signal (CRS) is not present in the subframe,

each of the plurality of sequences indicates individual informations contained in at least one of a type-of-reference signal set, a demodulation reference signal (DMRS) antenna port information set and a diversity scheme information set.

2. The method according to claim 1, wherein, when each of the plurality of sequences indicates the individual informations contained in the DMRS antenna port information set, the individual informations are DMRS port numbers associated with decoding of the system information.

3. The method according to claim 2, wherein, when the CRS is present in the subframe, the plurality of sequences indicating 1, 2 and 4 as the number of antenna ports indicate DMRS antenna ports {7}, {7, 9}, and {7, 8, 9, 10}, respectively.

4. The method according to claim 1, wherein, when each of the plurality of sequences indicates the individual informations contained in the type-of-reference signal set, the individual informations comprise a tracking reference signal and a DMRS.

5. The method according to claim 4, wherein, when the CRS is present in the subframe,

a sequence indicating 1 as the number of antenna ports indicates a tracking reference signal as a type of a reference signal associated with decoding of the system information, and

another sequence indicating a value greater than or equal to 2 as the number of antenna ports indicates the DMRS as the type of the reference signal associated with decoding of the system information.

6. The method according to claim 5, wherein, when the CRS is present in the subframe, the plurality of sequences indicating 2 and 4 as the number of antenna ports indicates DMRS antenna ports {7, 9} and {7, 8, 9, 10}, respectively.

7. The method according to claim 1, wherein, when each of the plurality of sequences indicates the individual informations contained in the diversity scheme information set, and the CRS is present in the subframe, a sequence indicating 2 as the number of antenna ports indicates that precoding of the system information has been performed based on the following table:

8. The method according to claim 1, wherein, when each of the plurality of sequences indicates the individual informations contained in the diversity scheme information set, and the CRS is present in the subframe, a sequence indicating 4 as the number of antenna ports indicates that precoding of the system information has been performed based on the following table:

9. The method according to claim 1, wherein, when each of the plurality of sequences indicates the individual informations contained in the diversity scheme information set, and the predetermined resource region includes fewer than 6 resource blocks, a precoding matrix used in transmitting the system information has a matrix according to the following table as a constituent matrix:

10. The method according to claim 1, wherein the number of antenna ports used for the system information is delivered to a UE receiving data multiplexed in a resource block for transmission of the system information.

11. The method according to claim 1, wherein the subframe is a first subframe of a radio frame.

12. The method according to claim 1, wherein the performing of the blind decoding comprises:

performing a module 2 operation by adding one of the plurality of sequences to a CRC parity bit part; and

dividing bits including the parity part determined through the modulo operation by a generation polynomial.

13. The method according to claim 1, wherein, when a physical downlink shared channel (PDSCH) and the PBCH are multiplexed in the subframe, and a first antenna port associated with the PDSCH differs from a second antenna port associated with the PBCH, the UE performs rate matching in consideration of the second antenna port in receiving the PDSCH.

14. A user equipment in a wireless communication, comprising:

a transmit module; and

a processor,

wherein the processor is configured to perform blind decoding for a physical broadcast channel (PBCH) in a predetermined resource region of a received subframe, based on a plurality of sequences masked on CRC parity bits,

wherein, when a cell-specific reference signal (CRS) is not present in the subframe,

each of the plurality of sequences indicates individual informations contained in at least one of a type-of-reference signal set, a demodulation reference signal (DMRS) antenna port information set and a diversity scheme information set.