Method for transmitting and receiving downlink control information in a wireless communication system and apparatus for the same

• US 9,474,062 B2
• Filed: 09/24/2015
• Issued: 10/18/2016
• Est. Priority Date: 04/29/2011
• Status: Active Grant

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Hakseong, Seo, Hanbyul
• Primary Examiner(s): LO, DIANE LEE
• Application Number:
  US14/864,569
• Publication Number:
  US 20160014748A1
• Time in Patent Office: 390 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04J 11/0073 Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/30 Resource management for broadcast services

Abstract

A method for receiving downlink channels from a base station (BS) at a user equipment (UE) in a wireless communication system. Control information is detected by monitoring a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (EPDCCH). A broadcast channel or a downlink shared channel is received based on the control information. The PDCCH is monitored on subframes configured for the broadcast channel. The EPDCCH is not monitored on the subframes configured for the broadcast channel.

Claims

1. A method for receiving downlink channels from a base station (BS) at a user equipment (UE) in a wireless communication system, the method comprising:

detecting, by the UE, control information by monitoring a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (EPDCCH) transmitted by the BS;

receiving, by the UE from the BS, a broadcast channel when the control information is detected by monitoring the PDCCH; and

receiving, by the UE from the BS, a downlink shared channel when the control information is detected by monitoring the EPDCCH,

wherein the PDCCH is monitored on subframes configured for receiving the broadcast channel, and

wherein the EPDCCH is not monitored on the subframes configured for receiving the broadcast channel.

2. The method of claim 1, wherein the PDCCH includes the control information for the UE to receive the broadcast channel from the BS.

3. The method of claim 1, wherein the EPDCCH includes the control information for the UE to receive the downlink shared channel from the BS.

4. The method of claim 1, wherein the PDCCH is monitored in a common search space and the EPDCCH is monitored in a UE specific search space.

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

a wireless communication module configured to receive downlink channels from a base station (BS); and

a processor configured to;

detect control information by monitoring a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (EPDCCH) transmitted by the BS,

control the wireless communication module to receive a broadcast channel from the BS when the control information is detected by monitoring the PDCCH, and

control the wireless communication module to receive a downlink shared channel from the BS when the control information is detected by monitoring the EPDCCH,

wherein the PDCCH is monitored in subframes configured for receiving the broadcast channel, and

wherein the EPDCCH is not monitored in the subframes configured for receiving the broadcast channel.

6. The UE of claim 5, wherein the PDCCH includes the control information for the wireless communication module to receive the broadcast channel from the BS.

7. The UE of claim 5, wherein the EPDCCH includes the control information for the wireless communication module to receive the downlink shared channel from the BS.

8. The UE of claim 5, wherein the PDCCH is monitored in a common search space and the EPDCCH is monitored in a UE specific search space.

9. A method for transmitting downlink channels to a user equipment (UE) at a base station (BS) in a wireless communication system, the method comprising:

transmitting, by the BS to the UE, control information via a physical downlink control channel (PDCCH) or via an enhanced physical downlink control channel (EPDCCH);

transmitting, by the BS to the UE, a broadcast channel when the control information is transmitted via the PDCCH; and

transmitting, by the BS to the UE, a downlink shared channel when the control information is transmitted via the EPDCCH,

wherein the PDCCH is transmitted on subframes configured for transmitting the broadcast channel, and

wherein the EPDCCH is not transmitted on the subframes configured for transmitting the broadcast channel.

10. The method of claim 9, wherein the PDCCH includes the control information for the BS to transmit the broadcast channel to the UE.

11. The method of claim 9, wherein the EPDCCH includes the control information for the BS to transmit the downlink shared channel to the UE.

12. The method of claim 9, wherein the PDCCH is transmitted in a common search space and the EPDCCH is transmitted in a UE specific search space.

13. A base station (BS) in a wireless communication system, the BS comprising:

a wireless communication module configured to transmit downlink channels to a user equipment (UE); and

a processor configured to;

control the wireless communication module to transmit control information to the UE via a physical downlink control channel (PDCCH) or via an enhanced physical downlink control channel (EPDCCH), and

control the wireless communication module to transmit a broadcast channel to the UE when the control information is transmitted to the UE via the PDCCH, and

control the wireless communication module to transmit a downlink shared channel to the UE when the control information is transmitted to the UE via the EPDCCH,

wherein the PDCCH is transmitted on subframes configured for transmitting the broadcast channel, and

wherein the EPDCCH is not transmitted on the subframes configured for transmitting the broadcast channel.

14. The BS of claim 13, wherein the PDCCH includes the control information for the BS to transmit the broadcast channel to the UE.

15. The BS of claim 13, wherein the EPDCCH includes the control information for the BS to transmit the downlink shared channel to the UE.

16. The BS of claim 13, wherein the PDCCH is transmitted in a common search space and the EPDCCH is transmitted in a UE specific search space.