Method for setting search region for downlink control channel in wireless communication system, and apparatus therefor

• US 9,883,503 B2
• Filed: 05/02/2017
• Issued: 01/30/2018
• Est. Priority Date: 04/13/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Hanbyul, Yang, Suckchel, Lee, Seungmin, Lee, Jihyun, Kim, Hakseong
• Primary Examiner(s): LO, DIANE LEE
• Application Number:
  US15/584,458
• Publication Number:
  US 20170238291A1
• Time in Patent Office: 273 Days
• Field of Search: None
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• 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 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• 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

A method for receiving an Enhanced Physical Downlink Control Channel (EPDCCH) from a base station by a user equipment (UE) in a wireless communication system. The UE receives a first EPDCCH for a first carrier by monitoring first EPDCCH candidates for the first carrier in a specific physical resource block (PRB) pair set. The UE receives a second EPDCCH for a second carrier by monitoring second EPDCCH candidates for the second carrier in the specific PRB pair set. A position of the second EPDCCH candidates is determined by applying an offset value for the second EPDCCH candidates into a position of the first EPDCCH candidate. The offset value for the second EPDCCH candidates is determined based on a carrier indicator field of the second carrier.

Claims

1. A method for receiving an enhanced physical downlink control channel (EPDCCH) from a base station by a user equipment (UE) in a wireless communication system, the method comprising:

receiving a first EPDCCH for a first carrier by monitoring first EPDCCH candidates for the first carrier in a specific physical resource block (PRB) pair set; and

receiving a second EPDCCH for a second carrier by monitoring second EPDCCH candidates for the second carrier in the specific PRB pair set,

wherein an interval between each of the second EPDCCH candidates at a specific aggregation level is determined based on a number of enhanced channel control elements (ECCEs) included in the resource block set of a subframe and a number of the second EPDCCH candidates at the specific aggregation level,

wherein a position of the second EPDCCH candidates is determined based on an offset value for the second EPDCCH candidates and the interval, and

wherein the offset value for the second EPDCCH candidates is determined based on a carrier indicator field of the second carrier.

2. The method according to claim 1, wherein the first EPDCCH and the second EPDCCH are transmitted via one or more aggregated carriers.

3. The method according to claim 1, wherein a number of ECCEs included in each of the first EPDCCH candidates and the second EPDCCH candidates is an aggregation level.

4. The method according to claim 3, wherein the position of each of the second EPDCCH candidates #m at the specific aggregation level L is determined by equation A:

5. The method according to claim 1, wherein a position of the first EPDCCH candidates is not determined based on a carrier indicator field.

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

a radio frequency (RF) module; and

a processor connected to the RF module and configured to;

receive, via the RF module, a first enhanced physical downlink control channel (EPDCCH) for a first carrier by monitoring first EPDCCH candidates for the first carrier in a specific physical resource block (PRB) pair set; and

receive, via the RF module, a second EPDCCH for a second carrier by monitoring second EPDCCH candidates for the second carrier in the specific PRB pair set,

wherein an interval between each of the second EPDCCH candidates at a specific aggregation level is determined based on a number of enhanced channel control elements (ECCEs) included in the resource block set of a subframe and a number of the second EPDCCH candidates at the specific aggregation level,

wherein a position of the second EPDCCH candidates is determined based on an offset value for the second EPDCCH candidates and the interval, and

wherein the offset value for the second EPDCCH candidates is determined based on a carrier indicator field of the second carrier.

7. The UE according to claim 6, wherein the first EPDCCH and the second EPDCCH are transmitted via one or more aggregated carriers.

8. The UE according to claim 6, wherein a number of ECCEs included in each of the first EPDCCH candidates and the second EPDCCH candidates is an aggregation level.

9. The UE according to claim 8, wherein the position of the each of EPDCCH candidate #m at the specific aggregation level L is determined by equation A:

10. The UE according to claim 6, wherein a position of the first EPDCCH candidates is not determined based on a carrier indicator field.

11. A method transmitting an enhanced physical downlink control channel (EPDCCH) by a base station to a user equipment (UE) in a wireless communication system, the method comprising:

transmitting a first EPDCCH for a first carrier to the UE, wherein the first EPDCCH mapped to one of first EPDCCH candidates for the first carrier in a specific physical resource block (PRB) pair set; and

transmitting a second EPDCCH for a second carrier set to the UE, wherein the second EPDCCH mapped to one of second EPDCCH candidates for the second carrier in the specific resource block,

wherein an interval between each of the second EPDCCH candidates at a specific aggregation level is determined based on a number of enhanced channel control elements (ECCEs) included in the resource block set of a subframe and a number of the second EPDCCH candidates at the specific aggregation level,

wherein a position of the second EPDCCH candidates is determined based on an offset value for the second EPDCCH candidates and the interval, and

wherein the offset value for the second EPDCCH candidates is determined based on a carrier indicator field of the second carrier.

12. A base station in a wireless communication system, the base station comprising:

a radio frequency (RF) module; and

a processor connected to the RF module and configured to;

transmit, via the RF module, a first enhanced physical downlink control channel (EPDCCH) for a first carrier to a user equipment (UE), wherein the first EPDCCH mapped to one of first EPDCCH candidates for the first carrier in a specific physical resource block (PRB) pair set; and

transmit, via the RF module, a second EPDCCH for a second carrier to the UE, wherein the second EPDCCH mapped to one of second EPDCCH candidates for the second carrier in the specific PRB pair set,

wherein an interval between each of the second EPDCCH candidates at a specific aggregation level is determined based on a number of enhanced channel control elements (ECCEs) included in the resource block set of a subframe and a number of the second EPDCCH candidates at the specific aggregation level,

wherein a position of the second EPDCCH candidates is determined based on an offset value for the second EPDCCH candidates and the interval, and

wherein the offset value for the second EPDCCH candidates is determined based on a carrier indicator field of the second carrier.