Method and apparatus for transmitting control signaling

• US 9,497,750 B2
• Filed: 12/19/2013
• Issued: 11/15/2016
• 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: Li, Chaojun, Lv, Yongxia, Wu, Qiang, Liu, Jianghua
• Primary Examiner(s): Levitan, Dmitry H
• Application Number:
  US14/134,932
• Publication Number:
  US 20140105162A1
• Time in Patent Office: 1,062 Days
• Field of Search: 370/310, 370/328, 370/329, 370/431, 370/464, 370/465
• US Class Current: 1/1
• 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, by a network node, control signaling, comprising:

determining that a physical downlink shared channel (PDSCH) transmission scheme for a component carrier accessed by a user equipment (UE) is;

a user equipment-specific reference signal (UE RS) based non precoding matrix indicator (Non-PMI) feedback transmission scheme by determining antenna ports corresponding to the UE RS wherein a Non-PMI feedback transmission scheme is a transmission scheme where no PMI is fed back by a UE; and

notifying the UE of the determined PDSCH transmission scheme by sending, by the network node, downlink control information (DCI) to the UE, where the format of the DCI is DCI format 1A, DCI format 1, or DCI format 2C, and wherein a disabled transport block in the DCI carries signaling used to indicate the determined antenna ports corresponding to the UE RS.

2. The method according to claim 1, 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 format of the DCI is DCI format 2C, and wherein the DCI indicates only one enabled transport block when the format of the DCI is DCI format 2C.

3. The method according to claim 1, wherein:

determining antenna ports corresponding to the UE RS is performed according to one selected from the group consisting of;

predefined antenna ports, and

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

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

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

5. The method according to claim 4, 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 by intercepting the UE RS from a cell-specific reference signal (CRS) configured on a component carrier accessed by the UE, wherein the UE RS 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.

6. A method for transmitting control signaling, comprising:

receiving, by a user equipment (UE), downlink control information (DCI) sent by an eNB; and

determining, by the UE according to the DCI, that a physical downlink shared channel (PDSCH) transmission scheme for a component carrier accessed by the UE is;

a user equipment-specific reference signal (UE RS) based non-precoding matrix indicator (Non-PMI) feedback transmission scheme by determining antenna ports corresponding to the UE RS, wherein a Non-PMI feedback transmission scheme is a transmission scheme where no PMI is fed back by a UE;

wherein the format of the DCI is DCI format 1A, DCI format 1, or DCI format 2C, and wherein a disabled transport block in the DCI carries signaling used to indicate the determined antenna ports corresponding to the UE RS.

7. The method according to claim 6, 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 format of the DCI is DCI format 2C, and wherein the DCI indicates only one enabled transport block when the format of the DCI is DCI format 2C.

8. The method according to claim 6, wherein:

determining antenna ports corresponding to the UE RS is performed according to one selected from the group consisting of;

predefined antenna ports, and

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

9. The method according to any claim 6, further comprising:

receiving, by the UE 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.

10. An apparatus for transmitting control signaling, comprising:

a processor, configured to determine that a physical downlink shared channel (PDSCH) transmission scheme for a component carrier accessed by a user equipment (UE) is a user equipment-specific reference signal (UE RS)-based non-precoding matrix indicator (Non-PMI) feedback transmission scheme by determining antenna ports corresponding to the UE RS, wherein a Non-PMI feedback transmission scheme is a transmission scheme where no PMI is fed back by a UE; and

a transmitter, configured to notify the UE of the determined PDSCH by sending downlink control information (DCI) to the UE, wherein the format of the DCI is DCI format 1A, DCI format 1, or DCI format 2C, and wherein a disabled transport block in the DCI carries signaling used to indicate the determined antenna ports corresponding to the UE RS.

11. The apparatus according to claim 10, 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 format of the DCI is format 2C, and the DCI indicates only one enabled transport block when the format of the DCI is DCI format 2C.

12. The apparatus according to claim 10, wherein the processor is further configured to perform one or more of the group consisting of:

determine antenna ports corresponding to the UE RS according to one selected from the group consisting of;

predefined antenna ports, and

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

13. The apparatus according to claim 10, further comprising:

a transceiver, configured to send, to the UE, a PDSCH and a UE RS corresponding to the PDSCH transmission scheme determined by the processor.

14. The apparatus according to claim 13, wherein the transceiver is further configured to:

acquire a UE RS corresponding to the PDSCH transmission scheme by intercepting the UE RS from a cell-specific reference signal (CRS) configured on a component carrier accessed by the UE, wherein the CRS belongs to a frequency domain range that is the same as a frequency domain range of the UE RS; and

send the PDSCH and the UE RS to the UE.

15. An apparatus of a user equipment (UE) for transmitting control signaling, comprising:

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

a processor, configured to;

determine, according to the DCI, that a physical downlink shared channel (PDSCH) transmission scheme for a component carrier accessed by the UE is a user equipment-specific reference signal (UE RS) based non-precoding matrix indicator (Non-PMI) feedback transmission scheme by determining antenna ports corresponding to the UE RS, wherein a Non-PMI feedback transmission scheme is a transmission scheme where no PMI is fed back by a UE,

wherein the format of the DCI is DCI format 1A, DCI format 1, or DCI format 2C, and wherein a disabled transport block in the DCI carries signaling used to indicate the determined antenna ports corresponding to the UE RS.

16. The apparatus according to claim 15, 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 format of the DCI is DCI format 2C, and wherein the DCI indicates only one enabled transport block when the format of the DCI is DCI format 2C.

17. The apparatus according to claim 15, wherein the processor is further configured to perform one or more of the group consisting of:

determine antenna ports corresponding to the UE RS according to one selected from the group consisting of;

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

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

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

wherein the processor is further configured to demodulate, according to the PDSCH transmission scheme determined by the processor and the UE RS received by the second receiver, the PDSCH received by the second receiver.