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

• US 9,661,627 B2
• Filed: 07/06/2016
• Issued: 05/23/2017
• Est. Priority Date: 04/13/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Jihyun, Seo, Hanbyul, Yang, Suckchel, Kim, Hakseong, Lee, Seungmin
• Primary Examiner(s): LO, DIANE LEE
• Application Number:
  US15/203,561
• Publication Number:
  US 20160316461A1
• Time in Patent Office: 321 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 is provided for receiving an Enhanced Physical Downlink Control Channel (EPDCCH) from a base station by a user equipment (UE) in a wireless communication system. An EPDCCH is received for a first carrier by monitoring first EPDCCH candidates for the first carrier in a specific physical resource block (PRB) pair set. An EPDCCH is received for a second carrier by monitoring second EPDCCH candidates for the second carrier in the specific PRB pair set. The first EPDCCH between each of the first EPDCCH candidates at a specific aggregation level. The second EPDCCH candidates have an offset smaller than the interval from the first EPDCCH candidates.

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 first EPDCCH candidates at a specific aggregation level is determined based on a first value obtained by dividing a number of Enhanced Control Channel Elements (ECCEs) included in a resource block set of a subframe by a number of the second EPDCCH candidates at the specific aggregation level, and

wherein a position of the second EPDCCH candidates is determined based on a second value obtained by adding the interval and an offset.

2. The method according to claim 1, the first EPDCCH and the second EPDCCH are transmitted via at least one aggregated carrier.

3. The method according to claim 1, wherein the offset is determined based on a carrier index of the second carrier.

4. 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.

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

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 first EPDCCH candidates at a specific aggregation level is determined based on a first value obtained by dividing a number of Enhanced Control Channel Elements (ECCEs) included in a resource block set of a subframe by a number of the second EPDCCH candidates at the specific aggregation level, and

wherein a position of the second EPDCCH candidates is determined based on a second value obtained by adding the interval and an offset.

7. The UE according to claim 6, wherein the first EPDCCH and the second EPDCCH are transmitted via at least one aggregated carrier.

8. The UE according to claim 6, wherein the offset is determined based on a carrier index of the second carrier.

9. 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.

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

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 first EPDCCH candidates at a specific aggregation level is determined based on a first value obtained by dividing a number of Enhanced Control Channel Elements (ECCEs) included in a resource block set of a subframe by a number of the second EPDCCH candidates at the specific aggregation level, and

wherein a position of the second EPDCCH candidates is determined based on a second value obtained by adding the interval and an offset.

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 first EPDCCH candidates at a specific aggregation level is determined based on a first value obtained by dividing a number of Enhanced Control Channel Elements (ECCEs) included in a resource block set of a subframe by a number of the second EPDCCH candidates at the specific aggregation level, and

wherein a position of the second EPDCCH candidates is determined based on a second value obtained by adding the interval and an offset.