METHOD FOR SENDING DOWNLINK CONTROL INFORMATION, TERMINAL DEVICE, AND NETWORK DEVICE

• US 20200136867A1
• Filed: 12/30/2019
• Published: 04/30/2020
• Est. Priority Date: 11/17/2017
• 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: SU, Liyan, YANG, Yubo, LI, Chaojun, CLASSON, Brian, CHENG, Yan
• Granted Patent: US 10,992,502 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 25/03929 with layer mapping, e.g. codeword-to layer design for space-time coding H04L1/0618
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 5/10 with dynamo-electric generation of carriers; with mechanical filters or demodulators
• CPC Class Codes: H04W 72/1273 of downlink data flows
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Embodiments of this application provide a method for sending downlink control information, a terminal device, and a network device, and relate to the communications field, to resolve problems of low flexibility and low reliability of a system DCI configuration. The method includes: receiving DCI for scheduling downlink data to be transmitted as one codeword, wherein the DCI comprises a value of a set of values each indicating a corresponding quantity of layers of the one codeword and one or more antenna ports used for sending the one codeword, and wherein the set of values comprises: a first value indicating that the quantity of layers of the one codeword is 2, and a first antenna port and a second antenna port are used for sending the one codeword, and a second value indicating that the quantity of layers of the one codeword is 2 and a third antenna port and a fourth antenna port are used for sending the one codeword.

Claims

1. A method for receiving downlink data, the method comprising:

receiving, by an apparatus, downlink control information (DCI) for scheduling downlink data to be transmitted as one codeword, wherein the DCI comprises a value of a set of values each indicating a corresponding quantity of layers of the one codeword and one or more antenna ports used for demodulating the one codeword, and wherein the set of values comprises;

a first value indicating that the quantity of layers of the one codeword is 2, and a first antenna port and a second antenna port are used for demodulating the one codeword, and

a second value indicating that the quantity of layers of the one codeword is 2 and a third antenna port and a fourth antenna port are used for demodulating sending the one codeword;

determining, by the apparatus, a quantity of layers and one or more antenna ports indicated by the value; and

receiving, by the apparatus, the downlink data transmitted as the one codeword based on the determined quantity of layers and the determined one or more antenna ports.

2. The method according to claim 1, wherein the set of values further comprises:

a third value indicating that the quantity of layers of the one codeword is 1 and the first antenna port is used for demodulating the one codeword;

a fourth value indicating that the quantity of layers of the one codeword is 1 and the third antenna port is used for demodulating the one codeword;

a fifth value indicating that the quantity of layers of the one codeword is 2, and the first antenna port and the second antenna port are used for demodulating the one codeword;

a sixth value indicating that the quantity of layers of the one codeword is 3, and the first antenna port, the second antenna port, and the third antenna port are used for demodulating the one codeword; and

a seventh value indicating that the quantity of layers of the one codeword is 4, and the first antenna port, the second antenna port, the third antenna port, and the fourth antenna port are used for demodulating the one codeword.

3. The method according to claim 2, wherein the set of values further comprises a reserved value that is currently unused.

4. The method according to claim 1, wherein the one codeword is sent by the one or more antenna ports as demodulation reference signal (DMRS).

5. A communications apparatus, comprising a memory and one or more processors, wherein the memory stores computer instructions which, when executed by the one or more processors, cause the communications apparatus to perform the steps of:

receiving downlink control information (DCI) for scheduling downlink data to be transmitted as one codeword, wherein the DCI comprises a value of a set of values each indicating a corresponding quantity of layers of the one codeword and one or more antenna ports used for demodulating the one codeword, and wherein the set of values comprises;

a first value indicating that the quantity of layers of the one codeword is 2, and a first antenna port and a second antenna port are used for demodulating the one codeword, and

a second value indicating that the quantity of layers of the one codeword is 2 and a third antenna port and a fourth antenna port are used for demodulating the one codeword;

determining, a quantity of layers and one or more antenna ports indicated by the value; and

receiving the downlink data transmitted as the one codeword based on the determined quantity of layers and the determined one or more antenna ports.

6. The communications apparatus according to claim 5, wherein the set of values further comprises:

a third value indicating that the quantity of layers of the one codeword is 1 and the first antenna port is used for demodulating sending the one codeword;

a fourth value indicating that the quantity of layers of the one codeword is 1 and the third antenna port is used for demodulating the one codeword;

a fifth value indicating that the quantity of layers of the one codeword is 2, and the first antenna port and the second antenna port are used for demodulating the one codeword;

a sixth value indicating that the quantity of layers of the one codeword is 3, and the first antenna port, the second antenna port, and the third antenna port are used for demodulating the one codeword; and

a seventh value indicating that the quantity of layers of the one codeword is 4, and the first antenna port, the second antenna port, the third antenna port, and the fourth antenna port are used for demodulating the one codeword.

7. The communications apparatus according to claim 6, wherein the set of values further comprises a reserved value that is currently unused.

8. The communications apparatus according to claim 5, wherein the one codeword is sent by the one or more antenna ports as demodulation reference signal (DMRS).

9. The communications apparatus according to claim 5, wherein the communications apparatus is a terminal device.

10. A non-transitory computer readable medium, comprising computer program instructions which when executed by one or more processors cause the one or more processors to perform the steps of:

receiving downlink control information (DCI) for scheduling downlink data to be transmitted as one codeword, wherein the DCI comprises a value of a set of values each indicating a corresponding quantity of layers of the one codeword and one or more antenna ports used for demodulating the one codeword, and wherein the set of values comprises;

a first value indicating that the quantity of layers of the one codeword is 2, and a first antenna port and a second antenna port are used for demodulating the one codeword, and

a second value indicating that the quantity of layers of the one codeword is 2 and a third antenna port and a fourth antenna port are used for demodulating the one codeword;

determining, a quantity of layers and the one or more antenna ports indicated by the value; and

receiving the downlink data transmitted as the one codeword based on the determined quantity of layers and the determined one or more antenna ports.

11. The non-transitory computer readable medium according to claim 10, wherein the set of values further comprises:

a third value indicating that the quantity of layers of the one codeword is 1 and the first antenna port is used for demodulating the one codeword;

a fourth value indicating that the quantity of layers of the one codeword is 1 and the third antenna port is used for demodulating the one codeword;

a fifth value indicating that the quantity of layers of the one codeword is 2, and the first antenna port and the second antenna port are used for demodulating the one codeword;

a sixth value indicating that the quantity of layers of the one codeword is 3, and the first antenna port, the second antenna port, and the third antenna port are used for demodulating the one codeword; and

a seventh value indicating that the quantity of layers of the one codeword is 4, and the first antenna port, the second antenna port, the third antenna port, and the fourth antenna port are used for demodulating the one codeword.

12. The non-transitory computer readable medium according to claim 11, wherein the set of values further comprises a reserved value that is currently unused.

13. The non-transitory computer readable medium according to claim 10, wherein the one codeword is sent by the one or more antenna ports as demodulation reference signal (DMRS).