CSI-RS sending method and device, and base station

1. A channel state information-reference signal (CSI-RS) sending method, comprising:

receiving capability indication information of each user equipment (UE) in a cell;

determining N transmission schemes based on the capability indication information, wherein N is greater than or equal to 2, and a total quantity of CSI-RSs corresponding to the N transmission schemes is greater than 40;

configuring CSI-RS resources to be multiplexed by the CSI-RSs corresponding to the N transmission schemes, wherein the CSI-RS resources are radio sending resources carrying the CSI-RSs corresponding to the N transmission schemes;

and sending, to a corresponding UE based on each of the N transmission schemes, a CSI-RS that is carried on the CSI-RS resource and that corresponds to the corresponding transmission scheme.

2. The CSI-RS sending method according to claim 1 , wherein the configuring CSI-RS resources to be multiplexed by the CSI-RSs corresponding to the N transmission schemes comprises:

configuring a time domain resource to be occupied by the CSI-RS corresponding to each of the N transmission schemes, so that the time domain resource occupied by the CSI-RS corresponding to each of the N transmission schemes is different from a time domain resource occupied by a CSI-RS corresponding to another transmission scheme;

and/or configuring resource blocks (RBs) to be used, in a staggered manner, by the CSI-RSs corresponding to the N transmission schemes, wherein a total quantity of resource elements (Res) occupied on each used RB is less than or equal to 40;

and/or configuring a code resource for each of the N transmission schemes, so that CSI-RSs that occupy a same RE but correspond to different transmission schemes are encoded based on different code resources.

3. The CSI-RS sending method according to claim 2 , wherein the configuring a time domain resource to be occupied by the CSI-RS corresponding to each of the N transmission schemes comprises:

configuring a subframe offset of a sending periodicity of the CSI-RS corresponding to each of the N transmission schemes, so that the subframe offset of the sending periodicity of the CSI-RS corresponding to each of the N transmission schemes is different from a subframe offset of a sending periodicity of the CSI-RS corresponding to the another transmission scheme.

4. The CSI-RS sending method according to claim 3 , wherein the configuring a time domain resource to be occupied by the CSI-RS corresponding to each of the N transmission schemes further comprises:

configuring a start sending moment of the CSI-RS corresponding to each of the N transmission schemes, so that the start sending moment of the CSI-RS corresponding to each of the N transmission schemes is different from a start sending moment of the CSI-RS corresponding to the another transmission scheme.

5. The CSI-RS sending method according to claim 2 , wherein the configuring resource blocks (RBs) to be used, in a staggered manner, by the CSI-RSs corresponding to the N transmission schemes comprises:

determining a start RB for sending the CSI-RSs corresponding to the N transmission schemes;

and sequentially configuring, starting from the start RB, an (i+nN) th RB as an RB to be used by a CSI-RS corresponding to an i th transmission scheme in the N transmission schemes, wherein i is greater than or equal to 1 and less than or equal to N, and n is an integer greater than or equal to 0.

6. The CSI-RS sending method according to claim 2 , wherein the configuring resource blocks (RBs) to be used, in a staggered manner, by the CSI-RSs corresponding to the N transmission schemes comprises:

determining a start RB for sending the CSI-RSs corresponding to the N transmission schemes;

grouping the CSI-RSs corresponding to the N transmission schemes into in groups, wherein a quantity of CSI-RSs comprised in each of m−1 groups is 40, and a quantity of CSI-RSs comprised in one group is less than or equal to 40;

and sequentially configuring, starting from the start RB, a (j+nm) th RB as an RB corresponding to a j th group of CSI-RSs in the m groups of CSI-RSs, wherein j is greater than or equal to 1 and less than or equal to in, and n is an integer greater than or equal to 0.

7. The CSI-RS sending method according to claim 2 , wherein when N is an even number, the configuring a code resource for each of the N transmission schemes comprises:

grouping the N transmission schemes in pairs, to obtain N/2 transmission scheme groups;

configuring one code group corresponding to each of the N/2 transmission scheme groups, wherein the one code group comprises two mask sequences that are orthogonal to each other, and the two mask sequences have a one-to-one correspondence with two transmission schemes in the corresponding transmission scheme group;

and encoding, based on a mask in a corresponding mask sequence, the CSI-RS corresponding to each of the N transmission schemes.

8. The CSI-RS sending method according to claim 2 , wherein when N is an odd number, the configuring a code resource for each of the N transmission schemes comprises:

adding one virtual transmission scheme having no corresponding CSI-RS;

grouping N+1 transmission schemes in pairs, to obtain (N+1)/2 transmission scheme groups;

configuring one code group corresponding to each of the (N+1)/2 transmission scheme groups, wherein the one code group comprises two mask sequences that are orthogonal to each other, two transmission schemes, in each of (N+1)/2−1 transmission scheme groups that are in the (N+1)/2 transmission scheme groups and that do not comprise the virtual transmission scheme, have a one-to-one correspondence with two mask sequences in a code group corresponding to each of the (N+1)/2−1 transmission scheme groups, and a transmission scheme, other than the virtual transmission scheme and in a transmission scheme group comprising the virtual transmission scheme, corresponds to any mask sequence in a code group corresponding to the transmission scheme group;

and encoding, based on a mask in a corresponding mask sequence, the CSI-RS corresponding to each of the N transmission schemes.

9. The CSI-RS sending method according to claim 2 , wherein the configuring a code resource for each of the N transmission schemes comprises:

when the N transmission schemes correspond to different quantities of CSI-RSs, combining CSI-RSs corresponding to transmission schemes that are in the N transmission schemes and that each correspond to a quantity of CSI-RSs less than a largest quantity of CSI-RSs corresponding to a transmission scheme in the N transmission schemes, to obtain Z CSI-RS sequences in total, wherein in the Z CSI-RS sequences, a quantity of CSI-RSs of each of Z−1 CSI-RS sequences is equal to the largest quantity of CSI-RSs corresponding to the transmission scheme in the N transmission schemes, a quantity of CSI-RSs of one CSI-RS sequence is less than or equal to the largest quantity of CSI-RSs corresponding to the transmission scheme in the N transmission schemes, and Z is less than or equal to N;

respectively configuring Z mask sequences for the Z CSI-RS sequences;

and encoding, based on a mask in a corresponding mask sequence, each CSI-RS in the Z CSI-RS sequences.

10. The CSI-RS sending method according to claim 7 , wherein the configuring a code group corresponding to a transmission scheme group comprises:

when the N transmission schemes correspond to the different quantities of CSI-RSs, determining whether a quantity of transmission schemes corresponding to the largest quantity of CSI-RSs is 1;

and when the quantity of transmission schemes corresponding to the largest quantity of CSI-RSs is 1, configuring a quantity of masks in each of the mask sequences to be a target quantity, wherein the target quantity is the largest quantity of CSI-RSs corresponding to the transmission scheme in the N transmission schemes, or a second largest quantity of CSI-RSs corresponding to a transmission scheme in the N transmission schemes;

or when the quantity of transmission schemes corresponding to the largest quantity of CSI-RSs is not 1, configuring a quantity of masks in each of the mask sequences to be the largest quantity of CSI-RSs.

11. The CSI-RS sending method according to claim 7 , wherein after the configuring a code group, the method further comprises:

sending each group of masks to UE corresponding to a corresponding transmission scheme.

12. A channel state information-reference signal (CSI-RS) sending device, comprising modules configured to perform the CSI-RS sending method according to claim 1 .

13. A base station, comprising a processor and a memory, wherein the memory is configured to store a program instruction;

and the processor is configured to invoke and execute the program instruction stored in the memory, so that the base station performs the CSI-RS sending method according to claim 1 .

14. A non-transitory computer-readable storage medium, comprising an instruction, wherein when the instruction is run on a computer, the computer is enabled to perform the CSI-RS sending method according to claim 1 .