METHOD AND APPARATUS FOR RECEIVING DOWNLINK SIGNAL IN WIRELESS COMMUNICATION SYSTEM

• US 20150237603A1
• Filed: 09/13/2013
• Published: 08/20/2015
• Est. Priority Date: 09/17/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Inkwon
• Granted Patent: US 9,756,623 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0602 using antenna switching H04B7/0686 takes precedence; antenna beam directivity switching H01Q3/24
• CPC Class Codes: H04L 1/0038 Blind format detection for detection of modulation format H04L27/0012
• 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 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present invention relates to a method by which a terminal receives a downlink signal through an enhanced physical downlink control channel (EPDCCH) in a wireless communication system. The method includes the steps of: receiving one or more EPDCCH physical resource block (PRB) sets; and blind decoding EPDCCH candidates for each set level from among the one or more EPDCCH PRB sets, wherein one or more of EPDCCH candidate indexes and EPDCCH PRB indexes are used for determining an antenna port related to the EPDCCH candidates.

Claims

1. A method for receiving a downlink signal through an Enhanced Physical Downlink Control Channel (EPDCCH) in a wireless communication system by a user equipment (UE), comprising:

receiving one or more EPDCCH PRB (Physical Resource Block) set; and

performing blind decoding of an EPDCCH candidate for each aggregation level in the one or more EPDCCH PRB set,

wherein at least one of an EPDCCH candidate index and an EPDCCH PRB set index is used to determine an antenna port related to the EPDCCH candidate.

2. The method according to claim 1, wherein the one or more EPDCCH PRB set includes a localized EPDCCH PRB set.

3. The method according to claim 1, wherein:

the lowest ECCE index of the EPDCCH candidate, a user equipment identifier (UE ID), and the number of ECCEs for each resource block are used to determine the antenna port related to the EPDCCH candidate.

4. The method according to claim 1, wherein the antenna port related to the EPDCCH candidate is decided by any one of the following equations,

n′

=(n_ECCE,low+idx_set)mod N_ECCE^RB+n_RNTI mod min(N_ECCE^EPDCCH, N_ECCE^RB)

n′

=n_ECCE,low mod N_ECCE^RB+(n_RNTI+idx_set)mod min(N_ECCE^EPDCCH, N_ECCE^RB)

n′

=(n_ECCE,low+idx_set)mod N_ECCE^RB+(n_RNTI+idx_set)mod min(N_ECCE^EPDCCH, N_ECCE^RB)  

 

[Equations]

where, n′

is a value for indicating the antenna port, n_ECCE,low is the lowest ECCE index from among ECCEs constructing the EPDCCH candidate contained in an EPDCCH set, n_RNTI is a user equipment identifier (UE ID), N_ECCE^RB is the number of ECCEs per resource block, N_ECCE^EPDCCH is an aggregation level, and idx_set is the EPDCCH PRB set index.

5. The method according to claim 1, wherein the antenna port related to the EPDCCH candidate is decided by any one of the following equations,

n′

=(n_ECCE,low+idx_can)mod N_ECCE^RB+n_RNTI mod min(N_ECCE^EPDCCH, N_ECCE^RB)

n′

=n_ECCE,low mod N_ECCE^RB+(n_RNTI+idx_can)mod min(N_ECCE^EPDCCH, N_ECCE^RB)

n′

=(n_ECCE,low+idx_can)mod N_ECCE^RB+(n_RNTI+idx_can)mod min(N_ECCE^EPDCCH, N_ECCE^RB)  

 

[Equations]

where, n′

is a value for indicating the antenna port, n_ECCE,low is the lowest ECCE index from among ECCEs constructing the EPDCCH candidate contained in an EPDCCH set, n_RNTI is a user equipment identifier (UE ID), N_ECCE^RB is the number of ECCEs per resource block, N_ECCE^EPDCCH is an aggregation level, and idx_can is the EPDCCH candidate index.

6. The method according to claim 1, wherein the antenna port related to the EPDCCH candidate is decided by any one of the following equations,

n′

=(n_ECCE,low+idx_set+idx_can)mod N_ECCE^RB+n_RNTI mod min(N_ECCE^EPDCCH, N_ECCE^RB)

n′

=n_ECCE,low mod N_ECCE^RB+(n_RNTI+idx_set+idx_can)mod min(N_ECCE^EPDCCH, N_ECCE^RB)

n′

=(n_ECCE,low+idx_set+idx_can)mod N_ECCE^RB+(n_RNTI+idx_set+idx_can)mod min(N_ECCE^EPDCCH, N_ECCE^RB)

where, n′

is a value for indicating the antenna port, n_ECCE,low is the lowest ECCE index from among ECCEs constructing the EPDCCH candidate contained in an EPDCCH set, n_RNTI is a user equipment identifier (UE ID), N_ECCE^RB is the number of ECCEs per resource block, N_ECCE^EPDCCH is an aggregation level, idx_can is the EPDCCH candidate index, and set idx_set is the EPDCCH PRB set index.

7. The method according to claim 4, wherein:

if n′

is 0, 1, 2, or 3, n′

=0 indicates an antenna port #107, n′

=1 indicates an antenna port #108, n′

=2 indicates an antenna port #109, or n′

=3 indicates an antenna port #110.

8. The method according to claim 1, wherein the number of antenna ports related to the EPDCCH candidate is set to 1, irrespective of an aggregation level.

9. The method according to claim 1, wherein the EPDCCH candidate index or the EPDCCH PRB set index do not correspond to a multiple of the aggregation level.

10. The method according to claim 1, wherein:

if the EPDCCH candidate index or the EPDCCH PRB set index is a multiple of the aggregation level, and if at least two EPDCCH candidates correspond to one antenna port, antenna ports related to the at least two EPDCCH candidates are differently determined.

11. The method according to claim 10, wherein the antenna port related to the at least two EPDCCH candidates is determined to be an antenna port allocated to an ECCE in the order of ECCE indexes corresponding to the EPDCCH candidates.

12. The method according to claim 1, wherein the one or more EPDCCH PRB set is indicated through higher layer signaling.

13. A user equipment (UE) device for receiving a downlink signal through an Enhanced Physical Downlink Control Channel (EPDCCH) in a wireless communication system by a user equipment (UE), comprising:

a reception (Rx) module; and

a processor,

wherein the processor receives one or more EPDCCH PRB (Physical Resource Block) set, and performs blind decoding of an EPDCCH candidate for each aggregation level in the one or more EPDCCH PRB set,

where at least one of an EPDCCH candidate index and an EPDCCH PRB set index is used to determine an antenna port related to the EPDCCH candidate.