METHOD AND APPARATUS FOR TRANSMITTING CONTROL SIGNALING

• US 20140105162A1
• Filed: 12/19/2013
• Published: 04/17/2014
• Est. Priority Date: 06/22/2011
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: WU, Qiang, LIU, Jianghua, LI, Chaojun, WU, Yongxia
• Granted Patent: US 9,497,750 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present invention discloses a method and an apparatus for transmitting control signaling. The method includes: determining that a physical downlink shared channel PDSCH transmission scheme for a non-backward compatible component carrier is a user equipment-specific reference signal UE RS-based non-precoding matrix indicator Non-PMI feedback transmission scheme or a UE RS-based up to 8 layer transmission scheme; and sending downlink control information DCI to a UE, where the DCI is used to indicate the determined PDSCH transmission scheme. The apparatus includes a determining module and a first sending module. The method and apparatus in embodiments of the present invention can expand application scenarios of the non-backward compatible component carrier, increase spectrum utilization of the system, and avoid a system capacity decrease problem caused by limitations on the application scenarios of the non-backward compatible component carrier.

Claims

1. A method for transmitting control signaling, comprising:

determining that a physical downlink shared channel (PDSCH) transmission scheme for a non-backward compatible component carrier is one of the group consisting of;

a user equipment-specific reference signal (UE RS) based non precoding matrix indicator (Non-PMI) feedback transmission scheme, and

a UE RS-based up to 8 layer transmission scheme; and

sending downlink control information (DCI) to a user equipment (UE),

wherein the DCI is used to indicate the determined PDSCH transmission scheme.

2. The method according to claim 1, wherein sending the DCI to the UE comprises:

sending the DCI in a DCI format 1A or a DCI format 1 to the UE when determining that the PDSCH transmission scheme is the UE RS-based Non-PMI feedback transmission scheme; and

sending the DCI in a DCI format 2C to the UE when determining that the PDSCH transmission scheme is the UE RS-based Non-PMI feedback transmission scheme, wherein values of three bits used to indicate antenna ports, a scrambling identity, and a number of layers indication in the DCI are “

111,” and

wherein the DCI indicates only one transport block.

3. The method according to claim 1, wherein determining the PDSCH transmission scheme for the non-backward compatible component carrier comprises one of the group consisting of:

determining antenna ports corresponding to a UE RS according to one of the group consisting of;

predefined antenna ports, and

the number of antenna ports contained in the channel state information-reference signal (CSI-RS); and

determining antenna ports corresponding to a UE RS and sending signaling used to indicate the determined antenna ports corresponding to the UE RS to the UE, wherein the signaling is one of the group consisting of;

signaling carried by the DCI and higher layer signaling.

4. The method according to claim 3, wherein the sending signaling carried by the DCI to the UE comprises:

sending signaling carried in a new data indicator field of a disabled transport block in the DCI to the UE, wherein the signaling carried in the new data indicator field is used to indicate the determined antenna ports corresponding to the UE RS.

5. The method according to claim 1, further comprising:

sending, to the UE, a PDSCH and a UE RS corresponding to the PDSCH transmission scheme.

6. The method according to claim 5, wherein the sending, to the UE, a PDSCH and a UE RS corresponding to the PDSCH transmission scheme comprises:

acquiring a UE RS corresponding to the PDSCH transmission scheme, wherein the UE RS is a signal that is intercepted from a cell-specific reference signal (CRS) and that belongs to a frequency domain range that is the same as a frequency domain range of the PDSCH; and

sending the PDSCH and the UE RS to the UE.

7. A method for transmitting control signaling, comprising:

receiving downlink control information (DCI) sent by an eNB; and

determining, according to the DCI, that a physical downlink shared channel (PDSCH) transmission scheme for a non-backward compatible component carrier is one of the group consisting of;

a user equipment-specific reference signal (UE RS)-based non-precoding matrix indicator (Non-PMI) feedback transmission scheme, and

a UE RS-based up to 8 layer transmission scheme.

8. The method according to claim 7, wherein determining, according to the DCI, a PDSCH transmission scheme for a non-backward compatible component carrier comprises:

determining that the PDSCH transmission scheme is the UE RS-based Non-PMI feedback transmission scheme when the DCI is in a DCI format 1A or a DCI format 1; and

determining that the PDSCH transmission scheme is the UE RS-based Non-PMI feedback transmission scheme when the DCI is in a DCI format 2C, when values of three bits used to indicate antenna ports, a scrambling identity, and the number of lavers indication in the DCI are “

111”

, and when the DCI indicates only one transport block.

9. The method according to claim 7, wherein the determining, according to the DCI, a PDSCH transmission scheme for a non-backward compatible component carrier comprises one of the group consisting of:

determining antenna ports corresponding to a UE RS according to one of the group consisting of;

predefined antenna ports, and

the number of antenna ports contained in the channel state information-reference signal (CSI-RS); and

determining antenna ports corresponding to a UE RS according to one of the group consisting of;

signaling carried by the DCI that is sent by the eNB and used to indicate antenna ports of the UE RS, and

higher layer signaling that is sent by the eNB and used to indicate antenna ports of the UE RS.

10. The method according to claim 9, wherein determining antenna ports corresponding to the UE RS according to one of the group consisting of:

signaling carried by the DCI that is sent by the eNB and used to indicate antenna ports of the UE RS and higher layer signaling that is sent by the eNB and used to indicate antenna ports of the UE RS, comprises;

determining antenna ports corresponding to the UE RS according to signaling carried in an NDI field of a disabled transport block in the DCI that is sent by the eNB.

11. The method according to any claim 7, further comprising:

receiving, from the eNB, a PDSCH and a UE RS corresponding to the PDSCH transmission scheme, and

demodulating the received PDSCH according to the PDSCH transmission scheme and the UE RS.

12. An apparatus for transmitting control signaling, comprising:

a determining module, configured to determine that a physical downlink shared channel (PDSCH) transmission scheme for a non-backward compatible component carrier is a user equipment-specific reference signal (UE RS)-based non-precoding matrix indicator (Non-PMI) feedback transmission scheme or a UE RS-based up to 8 layer transmission scheme; and

a first sending module, configured to send downlink control information (DCI) to a user equipment (UE), wherein the DCI is used to indicate the PDSCH transmission scheme determined by the determining module.

13. The apparatus according to claim 12, wherein the first sending module comprises one or more of the group consisting of:

a first sending unit, configured to, when the determining module determines that the PDSCH transmission scheme is the UE RS-based Non-PMI feedback transmission scheme, send the DCI in one of the group consisting of;

a DCI format 1A and a DCI format 1; and

a second sending unit, configured to, when the determining module determines that the PDSCH transmission scheme is the UE RS-based Non-PMI feedback transmission scheme, send the DCI in a DCI format 2C to the UE wherein values of three bits used to indicate antenna ports, a scrambling identity, and a number of layers indication in the DCI are “

111” and

the DCI indicates only one transport block.

14. The apparatus according to claim 12, wherein the determining module comprises one or more of the group consisting of:

a first determining unit, configured to determine antenna ports corresponding to a UE RS according to one of the group consisting of;

predefined antenna ports, and

a number of antenna ports contained in the channel state information-reference signal (CSI-RS);

a second determining unit, configured to determine antenna ports corresponding to a UE RS and to send signaling used to indicate the determined antenna ports corresponding to the UE RS to the UE, wherein the signaling is one of the group consisting of;

signaling carried by the DCI and higher layer signaling; and

a third determining unit, configured to determine antenna ports corresponding to a UE RS and to send signaling carried by a new data indicator field of a disabled transport block in the DCI to the UE, wherein the signaling carried by the new data indicator field is used to indicate the determined antenna ports corresponding to the UE RS.

15. The apparatus according to claim 12, further comprising:

a second sending module, configured to send, to the UE, a PDSCH and a UE RS corresponding to the PDSCH transmission scheme determined by the determining module.

16. The apparatus according to claim 15, wherein the second sending module comprises:

an acquiring unit, configured to acquire a UE RS corresponding to the PDSCH transmission scheme, wherein the UE RS is a signal that is intercepted from a cell-specific reference signal (CRS) and that belongs to a frequency domain range that is the same as a frequency domain range of the UE RS; and

a sending unit, configured to send the PDSCH and the UE RS to the UE.

17. An apparatus for transmitting control signaling, comprising:

a first receiving module, configured to receive downlink control information (DCI) sent by an eNB; and

a determining module, configured to determine, according to the DCI received by the first receiving module, that a physical downlink shared channel (PDSCH) transmission scheme for a non-backward compatible component carrier is one of the group consisting of;

a user equipment-specific reference signal (UE RS)-based non-precoding matrix indicator (Non-PMI) feedback transmission scheme and a UE RS-based up to 8 layer transmission scheme.

18. The apparatus according to claim 17, wherein the determining module comprises one or more of the group consisting of:

a first determining unit, configured to determine that the PDSCH transmission scheme is the UE RS-based Non-PMI feedback transmission scheme when the DCI is in a DCI format 1A or a DCI format 1; and

a second determining unit, configured to determine that the PDSCH transmission scheme is the UE RS-based Non-PMI feedback transmission scheme when the DCI is in a DCI format 2C, when values of three bits used to indicate antenna ports, a scrambling identity, and the number of layers indication in the DCI are “

111”

, and when the DCI indicates only one transport block.

19. The apparatus according to claim 17, wherein the determining module further comprises one or more of the group consisting of:

a third determining unit, configured to determine antenna ports corresponding to a UE RS according to one of the group consisting of;

predefined antenna ports and the number of antenna ports contained in the channel state information-reference signal (CSI-RS); and

a fourth determining unit, configured to determine antenna ports corresponding to a UE RS according to higher layer signaling that is sent by the eNB and used to indicate antenna ports of the UE RS or according to signaling carried by the DCI that is sent by the eNB and used to indicate antenna ports of the UE RS; and

a fifth determining unit, configured to determine antenna ports corresponding to a UE RS according to signaling carried in a new data indicator field of a disabled transport block in the DCI that is sent by the eNB.

20. The apparatus according to claim 17, further comprising:

a second receiving module, configured to receive a PDSCH and a UE RS corresponding to the PDSCH transmission scheme and sent by the eNB; and

a demodulating module, configured to demodulate, according to the PDSCH transmission scheme determined by the determining module and the UE RS received by the second receiving module, the PDSCH received by the second receiving module.