Reference signal transmission method and device

1. A method, comprising:

generating, by a second device, a reference signal sequence;

determining, by the second device, a first index set according to a value, wherein the value is a result of a modulo operation on a frame number of a radio frame by a value K, wherein K is a positive integer, wherein the first index set indicates at least one reference signal corresponding to the reference signal sequence, and the first index set comprises at least two indexes;

determining, by the second device according to the first index set, the at least one reference signal corresponding to the reference signal sequence;

mapping, by the second device, the at least one reference signal to a resource position corresponding to the radio frame, wherein the resource position is to be used to transmit the at least one reference signal; and

sending, by the second device, the at least one reference signal at the resource position.

2. The method according to claim 1 , wherein each reference signal corresponding to the reference signal sequence is a narrowband positioning reference signal (NPRS).

3. The method according to claim 1 , wherein the first index set satisfies a relation as follows:

m ′=( m 0 ′+2( n f mod 64))mod 220, wherein

m′ is the first index set, and n f is the frame number of the radio frame; and

when the method is used in a narrowband internet of things (NB-IoT) system deployed in a guard band or independently deployed, m 0 ′ satisfies a relation as follows:

m 01 =0,1

m 0 ′=m 01 +N RB max,DL −1, wherein

N RB max,DL indicates the maximum quantity of resource blocks (RBs) supported by the system, and N RB max,DL =110.

4. The method according to claim 1 , wherein the first index set satisfies a relation as follows:

m ′=( m 0 ′+2( n f mod 64+1))mod 220, wherein

m′ is the first index set, and n f is the frame number of the radio frame; and

when the method is used in a narrowband internet of things (NB-IoT) system deployed in-band, m 0 ′ satisfies a relation as follows:

m 01 =0,1

m 0 ′=m 01 +2 {dot over (n)} PRB ′+N RB max,DL −ñ, wherein

{dot over (n)} PRB is used to determine an index of an RB occupied by the at least one reference signal, and ñ is used to indicate that a quantity of RBs corresponding to a long term evolution (LTE) system bandwidth is an odd number or an even number; when ñ=1, it represents that the quantity of RBs corresponding to the LTE system bandwidth is an odd number, or when ñ=0, it represents that the quantity of RBs corresponding to the LTE system bandwidth is an even number; and N RB max,DL represents the maximum quantity of RBs supported by the system, and N RB max,DL =100.

5. A second device, 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:

generating a reference signal sequence; and

determining a first index set according to a value, wherein the value is a result of a modulo operation on a frame number of a radio frame by a value K, wherein K is a positive integer, wherein the first index set indicates at least one reference signal corresponding to the reference signal sequence, and the first index set comprises at least two indexes; and

mapping the at least one reference signal to a resource position corresponding to the radio frame, wherein the resource position is to be used to transmit the at least one reference signal; and

a transceiver, configured to send the at least one reference signal at the resource position.

6. The device according to claim 5 , wherein each reference signal corresponding to the reference signal sequence is a narrowband positioning reference signal (NPRS).

7. The device according to claim 5 , wherein the first index set satisfies a relation as follows:

m ′=( m 0 ′+2( n f mod 64))mod 220, wherein

m′ is the first index set, and n f is the frame number of radio frame; and

when the device is used in a narrowband internet of things (NB-IoT) system deployed in a guard band or independently deployed, m 0 ′ satisfies a relation as follows:

m 01 =0,1

m 0 ′=m 01 +N RB max,DL −1, wherein

N RB max,DL indicates the maximum quantity of (RBs) supported by the system, and N RB max,DL =110.

8. The device according to claim 5 , wherein the first index set satisfies a relation as follows:

m ′=( m 0 ′+2( n f mod 64))mod 220, wherein

m′ is the first index set, and n f is the frame number of the radio frame; and

when the device is used in a narrowband internet of things (NB-IoT) system deployed in-band, m 0 ′ satisfies a relation as follows:

m 01 =0,1

m 0 ′=m 01 +2 {dot over (n)} PRB ′+N RB max,DL −ñl , wherein

{dot over (n)} PRB is used to determine an index of an RB occupied by the at least one reference signal, and ñ is used to indicate that a quantity of RBs corresponding to a long term evolution (LTE) system bandwidth is an odd number or an even number; when ñ=1, it represents that the quantity of RBs corresponding to the LTE system bandwidth is an odd number, or when ñ=0, it represents that the quantity of RBs corresponding to the LTE system bandwidth is an even number; and N RB max,DL represents the maximum quantity of RBs supported by the system, and N RB max,DL =100.

9. A method, comprising:

generating, by a first device, a reference signal sequence;

determining, by the first device, a resource position to use to receive at least one first reference signal;

receiving, by the first device, the at least one first reference signal from a second device at the resource position;

determining, by the first device, a first index set according to a value, wherein the value is a result of a modulo operation on a frame number of a radio frame by a value K, wherein K is a positive integer, the radio frame corresponds to the resource position, and wherein the first index set indicates a reference signal index of at least one second reference signal corresponding to the reference signal sequence, and the first index set comprises at least two indexes; and

determining, by the first device, the at least one second reference signal from the generated reference signal sequence based on the first index set, wherein the reference signal index of the at least one second reference signal is the same as a reference signal index of the at least one first reference signal.

10. The method according to claim 9 , further comprising:

processing the at least one first reference signal and the at least one second reference signal.

11. The method according to claim 9 , wherein the at least one first reference signal is at least one of reference signals indicated by the first index set corresponding to the reference signal sequence generated by the second device.

12. The method according to claim 9 , wherein each reference signal corresponding to the reference signal sequence is a narrowband positioning reference signal (NPRS), and the first index set satisfies a relation as follows:

m ′=( m 0 ′+2( n f mod 64))mod 220, wherein

m′ is the first index set, and n f is the frame number of the radio frame; and

when the method is used in a narrowband internet of things (NB-IoT) system deployed in a guard band or independently deployed, m 0 ′ meets a relation as follows:

m 01 =0,1

m 0 ′=m 01 +N RB max,DL −1, wherein

N RB max,DL indicates the maximum quantity of (RBs) supported by the system, and N RB max,DL =110.

13. The method according to claim 9 , wherein each reference signal corresponding to the reference signal sequence is a narrowband positioning reference signal.

14. The method according to claim 9 , wherein each reference signal corresponding to the reference signal sequence is a narrowband positioning reference signal (NPRS), and the first index set satisfies a relation as follows:

m ′=( m 0 ′+2( n f mod 64))mod 220, wherein

m′ is the first index set, and n f is the frame number of the radio frame; and

when the method is used in a narrowband internet of things (NB-IoT) system deployed in-band, m 0 ′ satisfies a relation as follows:

m 01 =0,1

m 0 ′=m 01 +2 {dot over (n)} PRB ′+N RB max,DL −ñ, wherein

{dot over (n)} PRB is used to determine an index of an RB occupied by the at least one reference signal, and ñ is used to indicate that a quantity of RBs corresponding to a long term evolution (LTE) system bandwidth is an odd number or an even number; when ñ=1, it represents that the quantity of RBs corresponding to the LTE system bandwidth is an odd number, or when ñ=0, it represents that the quantity of RBs corresponding to the LTE system bandwidth is an even number; and N RB max,DL represents the maximum quantity of RBs supported by the system, and N RB max,DL =100.

15. A first device, comprising:

a transceiver;

a processor; and

a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for:

generating a reference signal sequence;

determining a resource position to use to receive at least one first reference signal; and

controlling the transceiver to receive the at least one first reference signal from a second device at the resource position;

determining a first index set according to a value, wherein the value is a result of a modulo operation on a frame number of a radio frame by a value K, wherein K is a positive integer, and the radio frame corresponds to the resource position, and wherein the first index set indicates a reference signal index of at least one second reference signal corresponding to the reference signal sequence, and the first index set comprises at least two indexes; and

determining the at least one second reference signal from the generated reference signal sequence based on the first index set, wherein the reference signal index of the at least one second reference signal is the same as a reference signal index of the at least one first reference signal.

16. The device according to claim 15 , wherein the program further includes instructions for:

processing the at least one first reference signal and the at least one second reference signal.

17. The device according to claim 15 , wherein the at least one first reference signal is indicated by the first index set corresponding to the reference signal sequence generated by the second device.

18. The device according to claim 15 , wherein each reference signal corresponding to the reference signal sequence is a narrowband positioning reference signal (NPRS), and the first index set satisfies a relation as follows:

m ′=( m 0 ′+2( n f mod 64))mod 220, wherein

m′ is the first index set, and n f is the frame number of the radio frame; and

when the device is used in a narrowband internet of things (NB-IoT) system deployed in a guard band or independently deployed, m 0 ′ satisfies a relation as follows:

m 01 =0,1

m 0 ′=m 01 +N RB max,DL −1, wherein

N RB max,DL indicates the maximum quantity of (RBs) supported by the system, and for the NPRS, N RB max,DL =110.

19. The device according to claim 15 , wherein each reference signal corresponding to the reference signal sequence is a narrowband positioning reference signal.

20. The device according to claim 15 , wherein each reference signal corresponding to the reference signal sequence is a narrowband positioning reference signal (NPRS), and the first index set satisfies a relation as follows:

m ′=( m 0 ′+2( n f mod 64)mod 220, wherein

m′ is the first index set, and n f is the frame number of the radio frame; and

when the method is used in a narrowband internet of things (NB-IoT) system deployed in-band, m 0 ′ satisfies a relation as follows:

m 01 =0,1

m 0 ′=m 01 +2 {dot over (n)} PRB ′+N RB max,DL −ñ, wherein

{dot over (n)} PRB is used to determine an index of an RB occupied by the at least one reference signal, and ñ is used to indicate that a quantity of RBs corresponding to a long term evolution (LTE) system bandwidth is an odd number or an even number; when ñ=1, it represents that the quantity of RBs corresponding to the LTE system bandwidth is an odd number, or when ñ=0, it represents that the quantity of RBs corresponding to the LTE system bandwidth is an even number; and N RB max,DL represents the maximum quantity of RBs supported by the system, and N RB max,DL =100.