Signal transmission method and apparatus
A reference signal transmission method is disclosed, the method including: determining at least two first reference signal resources; receiving a first channel based on the at least two first reference signal resources when a scheduling offset is less than or equal to a preset threshold and/or there is no spatial relation parameter information indication field in downlink control information DCI; and demodulating the first channel. When data on at least two reference signal resources needs to be received within a period of time, the method can increase a probability that a terminal device successfully receives the data.
1. A signal transmission method, comprising:
determining at least two first reference signal resources;
receiving a first channel based on a first target reference signal resource in response to a scheduling offset being less than or equal to a preset threshold, wherein the first target reference signal resource belongs to the at least two first reference signal resources and is determined based on first information, and wherein the first information is information about downlink control information (DCI) for scheduling the first channel, wherein the first target reference signal resource is a reference signal resource corresponding to a control resource set (CORESET) that is in a slot closest to the first channel and that has a smallest index value in CORESETs having an association relationship with the first information, and wherein the first channel carries a first type of data and a second type of data, wherein the first target reference signal resource is used to demodulate the first type of data; and
determining a second target reference signal resource from the at least two first reference signal resources, wherein the second target reference signal resource is used to demodulate the second type of data.
2. The method according to claim 1 , wherein the first information comprises at least one of the following:
an index number of a control resource set in which the DCI for scheduling the first channel is located;
an index number of a search space set in which the DCI for scheduling the first channel is located;
an antenna port field carried in the DCI for scheduling the first channel;
a transport block field carried in the DCI for scheduling the first channel;
repetition times indication information carried in the DCI for scheduling the first channel; or
a transmission configuration indicator field carried in the DCI for scheduling the first channel.
3. The method according to claim 1 , wherein the method further comprises:
determining at least one reference signal resource from the at least two first reference signal resources as the first target reference signal resource; and
demodulating the first channel based on the first target reference signal resource.
4. The method according to claim 3 , wherein the determining the at least one reference signal resource from the at least two first reference signal resources as the first target reference signal resource comprises:
determining the at least one reference signal resource from the at least two first reference signal resources as the first target reference signal resource based on the first information.
5. The method according to claim 1 , wherein the first target reference signal resource is associated with one of the at least two first reference signal resources, and wherein the second target reference signal resource is associated with a different one of the at least two first reference signal resources.
6. The method according to claim 1 , wherein the first type of data is a first codeword, and the second type of data is a second codeword.
7. The method according to claim 1 , wherein the first type of data is data from a first layer to a second layer, and the second type of data is data from a third layer to the fourth layer.
8. An apparatus, comprising:
at least one processor configured to determine at least two first reference signal resources; and
a transceiver is configured to:
receive a first channel based on a first target reference signal resource in response to a scheduling offset being less than or equal to a preset threshold, wherein the first target reference signal resource belongs to the at least two first reference signal resources and is determined based on first information, and wherein the first information is information about downlink control information (DCI) for scheduling the first channel, wherein the first target reference signal resource is a reference signal resource corresponding to a control resource set (CORESET) that is in a slot closest to the first channel and that has a smallest index value in CORESETs having an association relationship with the first information, and wherein the first channel carries a first type of data and a second type of data, wherein the first target reference signal resource is used to demodulate the first type of data:
wherein the at least one processor is further configured to:
determine a second target reference signal resource from the at least two first reference signal resources, wherein the second target reference signal resource is used to demodulate the second type of data.
9. The apparatus according to claim 8 , wherein the first information comprises at least one of the following:
an index number of a control resource set in which the DCI for scheduling the first channel is located;
an index number of a search space set in which the DCI for scheduling the first channel is located;
an antenna port field carried in the DCI for scheduling the first channel;
a transport block field carried in the DCI for scheduling the first channel;
repetition times indication information carried in the DCI for scheduling the first channel; or
a transmission configuration indicator field carried in the DCI for scheduling the first channel.
10. The apparatus according to claim 8 , wherein the at least one processor is further configured to:
determine at least one reference signal resource from the at least two first reference signal resources as the first target reference signal resource; and
demodulate the first channel based on the first target reference signal resource.
11. The apparatus according to claim 10 , wherein the determining the at least one reference signal resource from the at least two first reference signal resources as the first target reference signal resource comprises:
determining the at least one reference signal resource from the at least two first reference signal resources as the first target reference signal resource based on the first information.
12. The apparatus according to claim 8 , wherein the first target reference signal resource is associated with one of the at least two first reference signal resources, and wherein the second target reference signal resource is associated with a different one of the at least two first reference signal resources.
13. The apparatus according to claim 8 , wherein the first type of data is a first codeword, and the second type of data is a second codeword.
14. The apparatus according to claim 8 , wherein the first type of data is data from a first layer to a second layer, and the second type of data is data from a third layer to the fourth layer.