METHOD FOR TRANSMITTING DOWNLINK CONTROL SIGNALING, METHOD FOR SEARCHING DOWNLINK CONTROL SIGNALING AND APPARATUS USED FOR THE SAME

• US 20140119335A1
• Filed: 01/02/2014
• Published: 05/01/2014
• Est. Priority Date: 07/15/2011
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: WANG, Yi, ZHANG, Yuantao, ZHOU, Hua
• Application Number:
  US14/146,437
• Publication Number:
  US 20140119335A1
• Time in Patent Office: Days
• US Class Current: 370/330
• 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 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Embodiments of the present invention provide a method for transmitting downlink control signaling, a method for searching downlink control signaling and an apparatus used for the same. The method for transmitting includes: transmitting downlink control information (DCI) in a common search space of a control region of a wireless communications system, the DCI indicating a search space of a UE-specific physical downlink control channel (PDCCH) located in a data region of the wireless communications system, the DCI further including a predetermined identifier for identifying the DCI. With the methods and apparatuses of the embodiments of the present invention, the search space of the PDCCH may be dynamically adjusted, thereby saving signaling overhead, and avoiding inconsistence of the search space of the base station and that of the UE.

Claims

1. A method for transmitting downlink control signaling, comprising:

transmitting, by a base station, downlink control information (DCI) in a common search space of a control region of a wireless communications system, the DCI indicating a search space of a UE-specific physical downlink control channel (PDCCH) located in a data region of the wireless communications system;

and the DCI further including a predetermined identifier for identifying the DCI.

2. The method according to claim 1, wherein the DCI includes time-frequency resource allocation information located in the search space of the PDCCH of the data region, and/or offset information of the search space.

3. The method according to claim 2, wherein the time-frequency resource allocation information includes:

cell-specific common information;

or

transmission point-specific common information;

or

coordinated transmission point set-specific common information.

4. The method according to claim 2, wherein the offset information of the search space includes:

transmission point-specific search space offset information;

or

UE-specific search space offset information;

or

coordinated transmission point set-specific search space offset information.

5. The method according to claim 1, wherein the predetermined identifier is a predetermined bit in the DCI;

alternatively, the predetermined identifier is a radio network temporary identifier (RNTI).

6. A base station, comprising:

a transmitting unit configured to transmit downlink control information DCI in a common search space of a control region of a wireless communications system, the DCI indicating a search space of a physical downlink control channel (PDCCH) located in a data region of the wireless communications system;

and the DCI further including a predetermined identifier for identifying the DCI.

7. The base station according to claim 6, wherein the DCI transmitted by the transmitting unit includes time-frequency resource allocation information located in the search space of the PDCCH of the data region, and/or offset information of the search space.

8. The base station according to claim 7, wherein,

the time-frequency resource allocation information includes:

cell-specific common information, or transmission point-specific common information, or coordinated transmission point set-specific common information;

and the offset information of the search space includes;

transmission point-specific search space offset information, or UE-specific search space offset information, or coordinated transmission point set-specific search space offset information.

9. The base station according to claim 6, wherein the predetermined identifier included in the DCI transmitted by the transmitting unit is a predetermined bit in the DCI;

alternatively, the predetermined identifier is a radio network temporary identifier (RNTI).

10. User equipment, comprising:

a determining unit configured to determine whether a search space of a UE-specific physical downlink control channel (PDCCH) is to be transmitted in a control region of a wireless communications system or in a data region of the wireless communications system;

a decoding unit configured to search downlink control information (DCI) in a common search space of the control region of the wireless communications system, and to decode the DCI, when it is determined by the determining unit that the search space of the UE-specific PDCCH is transmitted in the data region of the wireless communications system; and

a reading unit configured to search a UE-specific PDCCH that includes physical downlink shared channel (PDSCH) scheduling or physical uplink shared channel (PUSCH) scheduling according to the search space of the PDCCH located in the data region indicated by the DCI obtained by the decoding unit by decoding.

11. The user equipment according to claim 10, wherein the decoding unit is used to determine, according to a predetermined identifier of the DCI, whether the DCI is a DCI used for indicating a search space of a UE-specific PDCCH located in the data region of the wireless communications system, and, if yes, to decode the DCI.

12. The user equipment according to claim 11, wherein the predetermined identifier of the DCI is a predetermined bit in the DCI;

alternatively, the predetermined identifier of the DCI is a radio network temporary identifier (RNTI).