Data communication method, device, and system
Various embodiments provide a data communication method. Under the method, a transmit end maps each code block group CBG in N CBGs to each layer in a corresponding layer group based on a correspondence between the N CBGs and N layer groups. Each layer group includes at least one layer, and N is a positive integer. The transmit end then sends data to a receive end. T transport block corresponding to the data includes the N CBGs. In this way, a mapping relationship between a CBG and a layer group is established by grouping layers, so as to improve data reception quality, through interference cancellation, for transmission among different layer groups, and ensure adaptivity to a CBG-based retransmission feedback, thereby optimizing transmission performance of an entire communications system.
1. A data communication method, wherein the method comprises:
mapping, by a transmit end, each code block group (CBG) in N CBGs to each layer comprised in a corresponding layer group based on a correspondence between the N CBGs and N layer groups, wherein each layer group comprises at least one layer, and N is a positive integer; and
sending, by the transmit end, data to a receive end, wherein a transport block (TB) corresponding to the data comprises the N CBGs,
wherein the N layer groups are grouped based on at least one piece of the following information: configured demodulation reference signal (DMRS) port group information, transmission and reception point (TRP) or TRP group information comprised in the transmit end, or identification information of a beam from the transmit end.
2. The method according to claim 1 , wherein the N layer groups are further grouped based on quasi co-location (QCL) information among antenna ports corresponding to layers.
3. The method according to claim 1 , wherein N>1, there are at least two CBGs in the N CBGs, and the two CBGs are configured with at least one of different modulation schemes, different bit rates, or different precoding matrices.
4. The method according to claim 1 , wherein
a total quantity of layers in the N layer groups is 1 or 2, N=1; or
a total quantity of layers in the N layer groups is 3 or 4, N=1 or N=2.
5. The method according to claim 1 , wherein
a quantity of code blocks (CBs) or a quantity of bits comprised in each CBG is directly proportional to a quantity of layers comprised in the corresponding layer group;
a quantity of CBs or a quantity of bits comprised in each CBG is directly proportional to at least one of the following: a modulation order, a bit rate, or a transmission rate of the corresponding layer group; or
a quantity of CBs or a quantity of bits comprised in each CBG is determined based on at least one of the following: a quantity of allocated resource blocks (RBs), a quantity of layers comprised in the corresponding layer group, and a modulation and coding scheme MCS of each CBG.
6. The method according to claim 1 , wherein further comprising:
in response to a GBG in the N CBGs to be retransmitted,
the CBG to be retransmitted is mapped to each layer comprised in a same layer group when the CBG is initially transmitted;
the CBG to be retransmitted is mapped to each layer comprised in at least one layer group in the N layer groups based on control signaling, and the at least one layer group is indicated by the control signaling;
the CBG to be retransmitted is mapped repeatedly to each layer in M layer groups in a single frequency network (SFN) manner, wherein a repetition quantity is M, 2≤M≤N, M is a positive integer and M layers groups are a subset of N layer groups; or
the CBG that needs to be retransmitted is mapped to each layer comprised in at least one layer group in the N layer groups based on a swap flag indication.
7. A data communication method, wherein the method comprises:
receiving, by a receive end, data from a transmit end, wherein a transport block (TB) corresponding to the data comprises N code block groups (CBGs); and
obtaining, by the receive end, the N CBGs from the data based on a correspondence between the N CBGs and N layer groups, wherein each layer group comprises at least one layer, each CBG is mapped to each layer in a corresponding layer group, and N is a positive integer,
wherein the N layer groups are grouped based on at least one piece of the following information: configured demodulation reference signal (DMRS) port group information, transmission and reception point (TRP) or TRP group information comprised in the transmit end, or identification information of a beam from the transmit end.
8. The method according to claim 7 , wherein the N layer groups are further grouped based on quasi co-location (QCL) information among antenna ports corresponding to layers.
9. The method according to claim 7 , wherein N>1, there are at least two CBGs in the N CBGs, and the two CBGs are configured with at least one of different modulation schemes, different bit rates, or different precoding matrices.
10. The method according to claim 7 , wherein
when a total quantity of layers in the N layer groups is 1 or 2, N=1; or
when a total quantity of layers in the N layer groups is 3 or 4, N=1 or N=2.
11. The method according to claim 7 , wherein
a quantity of code blocks (CBs) or a quantity of bits comprised in each CBG is directly proportional to a quantity of layers in the corresponding layer group;
a quantity of CBs or a quantity of bits in each CBG is directly proportional to at least one of the following: a modulation order, a bit rate, or a transmission rate of the corresponding layer group; or
a quantity of CBs or a quantity of bits in each CBG is determined based on at least one of the following: a quantity of allocated resource blocks RBs, a quantity of layers comprised in the corresponding layer group, and a modulation and coding scheme MCS of each CBG.
12. The method according to claim 7 , further comprising: in response to a CBG in the N CBGs to be retransmitted,
the CBG to be retransmitted is mapped to each layer comprised in a same layer group when the CBG is initially transmitted;
the CBG to be retransmitted is mapped to each layer comprised in at least one layer group in the N layer groups based on control signaling, and the at least one layer group is indicated by the control signaling;
the CBG to be retransmitted is mapped repeatedly to each layer comprised in M layer groups in a single frequency network SFN manner, wherein a quantity of repetitions is M, 2≤M≤N, M is a positive integer and M layer groups is a subset of N layer groups; or
the CBG that needs to be retransmitted is mapped to each layer comprised in at least one layer group in the N layer groups based on a swap flag indication.
13. A data communication apparatus, comprising:
a processor; and
a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for:
mapping each code block group (CBG) in N CBGs to each layer comprised in a corresponding layer group based on a correspondence between the N CBGs and N layer groups, wherein each layer group comprises at least one layer, and N is a positive integer; and
sending data to a receive end, wherein a transport block (TB) corresponding to the data comprises the N CBGs,
wherein the N layer groups are grouped based on at least one piece of the following information: configured demodulation reference signal (DMRS) port group information, transmission and reception point (TRP) or TRP group information comprised in the transmit end, or identification information of a beam from the transmit end.
14. The apparatus according to claim 13 , wherein the N layer groups are further grouped based on quasi co-location (QCL) information among antenna ports corresponding to layers.
15. The apparatus according to claim 13 , wherein N>1, there are at least two CBGs in the N CBGs, and the two CBGs are configured with at least one of different modulation schemes, different bit rates, or different precoding matrices.
16. The apparatus according to claim 13 , wherein
when a total quantity of layers in the N layer groups is 1 or 2, N=1; or
when a total quantity of layers in the N layer groups is 3 or 4, N=1 or N=2.
17. A data communication apparatus, comprising:
a processor; and
a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for:
receiving data from a transmit end, wherein a transport block (TB) corresponding to the data comprises N code block groups (CBGs); and
obtaining the N CBGs from the data based on a correspondence between the N CBGs and N layer groups, wherein each layer group comprises at least one layer, each CBG is mapped to each layer comprised in a corresponding layer group, and N is a positive integer,
wherein the N layer groups are grouped based on at least one piece of the following information: configured demodulation reference signal (DMRS) port group information, transmission and reception point (TRP) or TRP group information comprised in the transmit end, or identification information of a beam from the transmit end.
18. The apparatus according to claim 17 , wherein the N layer groups are further grouped based on quasi co-location (QCL) information among antenna ports corresponding to layers.
19. The apparatus according to claim 17 , wherein N>1, there are at least two CBGs in the N CBGs, and the two CBGs are configured with at least one of different modulation schemes, different bit rates, or different precoding matrices.
20. The apparatus according to claim 19 , wherein
when a total quantity of layers in the N layer groups is 1 or 2, N=1; or
when a total quantity of layers in the N layer groups is 3 or 4, N=1 or N=2.