PDCCH monitoring method and apparatus in a carrier junction system

Patent metadata

Field	Value
Publication number	US-9516670-B2
Application number	US-201414484035-A
Country	US
Kind code	B2
Filing date	Sep 11, 2014
Priority date	Apr 7, 2010
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

A method is described for receiving a downlink control information (DCI) from a base station (BS) by a user equipment (UE) in a wireless communication system. The method includes monitoring a plurality of physical downlink control channel (PDCCH) candidates having the same payload size in a common search space and a UE-specific search space on a primary cell to receive the DCI. The common search space and the UE-specific search space are overlapped. If the UE is configured with a carrier indicator field (CIF), the method further includes determining that only a PDCCH in the common search space is transmitted from among the plurality of PDCCH candidates.

First claim

What is claimed is:

1. A method for receiving a downlink control information (DCI) from a base station (BS) by a user equipment (UE) in a wireless communication system, the method comprising:
monitoring, by the UE, a plurality of physical downlink control channel (PDCCH) candidates having a same payload size in a common search space and a UE-specific search space on a primary cell to receive the DCI from the BS,
wherein the common search space and the UE-specific search space are overlapped; and
if the UE is configured with a carrier indicator field (CIF), determining, by the UE, that only a PDCCH in the common search space is transmitted by the BS from among the plurality of PDCCH candidates.

2. The method according to claim 1 , wherein the DCI carried by a PDCCH candidate in the UE-specific search space includes a CIF, and the DCI carried by a PDCCH candidate in the common search space does not include a CIF.

3. The method according to claim 1 , wherein an aggregation level of a PDCCH candidate in the common search space is the same as an aggregation level of a PDCCH candidate in the UE-specific search space.

4. The method according to claim 1 , wherein the DCI carried by a PDCCH candidate in the common search space has at least one different DCI field from that of the DCI carried by a PDCCH candidate in the UE-specific search space.

5. The method according to claim 1 , wherein the monitoring the plurality of PDCCH candidates includes performing a blind decoding for the plurality of PDCCH candidates, and the blind decoding includes performing cyclic redundancy check (CRC) de-scrambling for each of the plurality of PDCCH candidates using a radio network temporary identifier (RNTI).

6. A user equipment (UE) configured to receive a downlink control information (DCI) from a base station (BS) in a wireless communication system, the UE comprising:
a radio frequency (RF) unit configured to transmit and receive a radio signal; and
a controller operably coupled with the RF unit,
wherein the controller is configured to:
monitor a plurality of physical downlink control channel (PDCCH) candidates having a same payload size in a common search space and a UE-specific search space on a primary cell to receive the DCI from the BS,
wherein the common search space and the UE-specific search space are overlapped, and
if the UE is configured with a carrier indicator field (CIF), determine that only a PDCCH in the common search space is transmitted by the BS from among the plurality of PDCCH candidates.

7. The UE according to claim 6 , wherein the DCI carried by a PDCCH candidate in the UE-specific search space includes a CIF, and the DCI carried by a PDCCH candidate in the common search space does not include a CIF.

8. The UE according to claim 6 , wherein an aggregation level of a PDCCH candidate in the common search space is the same as an aggregation level of a PDCCH candidate in the UE-specific search space.

9. The UE according to claim 6 , wherein the DCI carried by a PDCCH candidate in the common search space has a different DCI field from that of the DCI carried by a PDCCH candidate in the UE-specific search space.

10. The UE according to claim 6 , wherein the controller is further configured to perform a blind decoding for the plurality of PDCCH candidates, and the blind decoding includes performing cyclic redundancy check (CRC) de-scrambling for each of the plurality of PDCCH candidates using a radio network temporary identifier (RNTI).

Assignees

• Lg Electronics Inc

Inventors

• Kim Soyeon
• Kim Jinmin
• Chung Jaehoon
• Han Seunghee

Classifications

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L5/0007 Primary

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04L5/001

  the frequencies being arranged in component carriers · CPC title