Uplink data transmission method and apparatus

1 . An uplink data transmission method, applied to a terminal device, the method comprising:

receiving configuration information from a network device, wherein the configuration information comprises a sounding reference signal (SRS) resource set, a value of a usage parameter of the SRS resource set is configured as a codebook, the SRS resource set comprises N SRS resources, and N is an integer greater than 0;

receiving downlink control information from the network device;

jointly determining, based on both a spatial rank index (SRI) field and a transmitted precoding matrix indicator (TPMI) field in the downlink control information, M SRS resources used for uplink data transmission,

wherein M is an integer greater than or equal to 1 and less than or equal to N,

wherein the SRI field alone does not indicate the M SRS resources,

wherein jointly determining M equals N is based on a quantity of antenna ports corresponding to a precoding matrix indicated by the TPMI field equaling a sum of quantities of antenna ports of the N SRS resources, and

wherein jointly determining M is less than N is based on the quantity of antenna ports corresponding to the precoding matrix indicated by the TPMI field being less than the sum of quantities of antenna ports of the N SRS resources; and

sending uplink data by using the M SRS resources.

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

determining that there is no SRI field in the downlink control information, or a length of the SRI field is 0 in response to the quantity of antenna ports of the precoding matrix indicated by the TPMI field being equal to the sum of the quantities of antenna ports of the N SRS resources.

3 . The method according to claim 1 , wherein determining the M SRS resources by using the SRI field comprises:

determining, based on a value of the SRI field, the M SRS resources used for uplink data transmission in one or more SRS resources whose quantities of antenna ports are equal to the quantity of antenna ports of the precoding matrix indicated by the TPMI field.

4 . An uplink data transmission method, applied to a network device, the method comprising:

sending configuration information to a terminal device, wherein the configuration information comprises a sounding reference signal (SRS) resource set, a value of a usage parameter of the SRS resource set is configured as a codebook, the SRS resource set comprises N SRS resources, and N is an integer greater than 0;

sending downlink control information to the terminal device,

wherein the downlink control information is configured such that a spatial rank index (SRI) field and a transmitted precoding matrix indicator (TPMI) field in the downlink control information are jointly interpreted by the terminal device to determine both (i) a number M and (ii) identities of SRS resources used for uplink data transmission,

wherein the SRI field alone does not indicate the number M of SRS resources,

wherein M is an integer greater than or equal to 1 and less than or equal to N,

wherein M is equal to N based on a quantity of antenna ports of a precoding matrix indicated by the TPMI field equaling a sum of quantities of antenna ports of the N SRS resources, and

wherein M is less than N based on the quantity of antenna ports of the precoding matrix indicated by the TPMI field being less than the sum of quantities of antenna ports of the N SRS resources; and

receiving uplink data sent by the terminal device by way of multiple beams corresponding to the M SRS resources.

5 . The method according to claim 4 , wherein in response to the quantity of antenna ports of the precoding matrix indicated by the TPMI field being equal to the sum of the quantities of antenna ports of the N SRS resources, there is no SRI field in the downlink control information, or a length of the SRI field is 0.

6 . An uplink data transmission method, applied to a terminal device, the method comprising:

receiving configuration information from a network device, wherein the configuration information comprises a sounding reference signal (SRS) resource set, a value of a usage parameter of the SRS resource set is configured as a codebook, the SRS resource set comprises N SRS resources, and N is an integer greater than 0;

receiving downlink control information (DCI) from the network device,

wherein the DCI includes a spatial rank index (SRI) field and a transmitted precoding matrix indicator (TPMI) field; and

in response to the configuration information meets a first condition, sending uplink data by using M of the N SRS resources,

wherein selection of the M SRS resources is based on joint interpretation of the SRI field and the TPMI field in the DCI,

wherein M is an integer greater than or equal to 1 and less than or equal to N,

wherein the SRI field alone does not indicate the value of M,

wherein M equals N based on a quantity of antenna ports corresponding to a precoding matrix indicated by the TPMI field in the DCI equaling a sum of quantities of antenna ports of the N SRS resources, and

wherein M is less than N based on the quantity of antenna ports corresponding to the precoding matrix indicated by the TPMI field being less than the sum of quantities of antenna ports of the N SRS resources.

7 . The method according to claim 6 , wherein the first condition comprises, in the N SRS resources, time domain resources of all the SRS resources overlap with each other.

8 . An uplink data transmission method, applied to a terminal device, the method comprising:

receiving, by the terminal device, configuration information from a network device,

wherein the configuration information comprises a sounding reference signal (SRS) resource set,

wherein a value of a usage parameter of the SRS resource set is configured as non-codebook,

wherein the SRS resource set comprises N SRS resources,

wherein the SRS resource set is associated with one or more channel state information reference signal (CSI-RS) resources, and

wherein N is an integer greater than 0;

receiving downlink control information from the network device,

wherein the downlink control information includes a spatial rank index (SRI) field and a transmitted precoding matrix indicator (TPMI) field;

jointly determining, by the terminal device, M SRS resources from the N SRS resources by using the SRI field and the TPMI field,

wherein the SRI field alone does not indicate the M SRS resources,

wherein M is an integer greater than or equal to 1 and less than or equal to N,

wherein M equals N based on a quantity of antenna ports corresponding to a precoding matrix indicated by the TPMI field equaling a sum of quantities of antenna ports of the N SRS resources, and

wherein M is less than N based on the quantity of antenna ports corresponding to the precoding matrix indicated by the TPMI field being less than the sum of quantities of antenna ports of the N SRS resources; and

determining, by the terminal device, a spatial reception parameter for reception of the one or more CSI-RS resources based on spatial relation information configured for the M SRS resources,

wherein the spatial reception parameter comprises at least one of a receive beam, a receive spatial filter, or a quasi-co-location (QCL) parameter associated with the one or more CSI-RS resources.

9 . The method according to claim 8 , wherein determining the spatial reception parameter of the one or more CSI-RS resources based on the spatial relation information of the N SRS resources comprises:

using all different spatial relation information in the spatial relation information associated with the N SRS resources as the spatial reception parameter of the one or more CSI-RS resources.

10 . The method according to claim 8 , wherein the spatial reception parameter of the one or more CSI-RS resources is determined based on the spatial relation information of the N SRS resources in response to one or more of the following conditions being met:

a transmission configuration indication state is not configured in the CSI-RS resource;

a transmission configuration indication state configured in the CSI-RS resource does not comprise information whose type is a type D;

spatial relation information is configured for at least one of the N SRS resources;

spatial relation information is configured for each of the N SRS resources;

the spatial relation information associated with the N SRS resources is the same;

the spatial relation information associated with the N SRS resources is not exactly the same;

the spatial relation information associated with the N SRS resources is completely different; or

a value of a first field in the SRS resource set is configured as a preset value.

11 . The method according to claim 10 , wherein the first field is used to indicate whether the spatial reception parameter of the one or more CSI-RS resources is determined by using the spatial relation information of the N SRS resources.

12 . The method according to claim 8 , wherein determining the spatial reception parameter of the one or more CSI-RS resources based on the spatial relation information of the N SRS resources comprises:

using spatial relation information of an SRS resource having a smallest or largest resource index in the N SRS resources as the spatial reception parameter of the one or more CSI-RS resources.

13 . The method according to claim 8 , wherein determining the spatial reception parameter of the one or more CSI-RS resources based on the spatial relation information of the N SRS resources comprises:

using spatial relation information of an SRS resource having a smallest or largest resource index in one or more SRS resources for which spatial relation information is configured in the N SRS resources as the spatial reception parameter of the one or more CSI-RS resources.

14 . The method according to claim 6 , wherein the first condition comprises, in the N SRS resources, time domain resources of at least two SRS resources overlap with each other.

15 . The method according to claim 6 , wherein the first condition comprises, in the N SRS resources, reference signal resources in spatial relation information parameters of all the SRS resources are different.

16 . The method according to claim 6 , wherein the first condition comprises, in the N SRS resources, reference signal resources in spatial relation information parameters of at least two SRS resources are different.

17 . The method according to claim 6 , wherein the first condition comprises, a value of N is greater than a preset value.