Reference signal mapping method and device
The present disclosure provides a reference signal mapping method and a reference signal mapping device. An N-port reference signal pattern is acquired in accordance with a 4-port or 8-port reference signal pattern, and N is an integer greater than 16. The N-port reference signal pattern includes an 18-port, 20-port, 24-port, 28-port or 32-port reference signal pattern. In the case of mapping a reference signal, RE positions to which a CSI-RS is mapped are determined in accordance with the N-port reference signal pattern, and resource mapping is performed on the CSI-RS in accordance with the RE positions, so as to map more-than-16-port CSI-RS, thereby to transmit the more-than-16-port CSI-RS.
1. A reference signal mapping method, comprising:
determining Resource Elements (REs) to which a Channel State Indication Reference Signal (CSI-RS) is mapped in accordance with an N-port reference signal pattern, N being an integer greater than 16, wherein RE positions to which an N-port CSI-RS in the N-port reference signal pattern is mapped are determined in accordance with RE positions to which a plurality of groups of M-port CSI-RSs in an M-port reference signal pattern are mapped, M being 4 or 8; and
performing resource mapping on the CSI-RS in accordance with the determined REs,
wherein N is 24 or 32, M is 4, the RE positions to which the N-port CSI-RS in the N-port reference signal pattern is mapped are the same as RE positions to which Q groups of 4-port CSI-RSs in a 4-port reference signal pattern are mapped, and each of the Q groups of 4-port CSI-RSs is multiplexed using four code words of a 4-bit Orthogonal Cover Code (OCC), where
Q
=
N
4
;
or
N is 18, 20, 24, 28 or 32, M is 8, the RE positions to which the N-port CSI-RS in the N-port reference signal pattern is mapped are the same as RE positions to which L groups of 8-port CSI-RSs in an 8-port reference signal pattern are mapped, where in the case that N is 18 or 24, L is 3, and in the case that N is 20, 28 or 32, L is 4.
2. The reference signal mapping method according to claim 1 , wherein in the case that M is 8,
every S ports of the N-port CSI-RS are multiplexed using S code words in 8 code words of an 8-bit OCC, wherein S is 6 or 8 in the case that N is 18, S is 5 or 8 in the case that N is 20, S is 7 or 8 in the case that N is 28, S is 8 in the case that N is 24, and S is 8 in the case that N is 32; or
every K ports of the N-port CSI-RS are multiplexed using a K-bit OCC, wherein K is 6 in the case that N is 18, K is 5 in the case that N is 20, and K is 7 in the case that N is 28; or
each of the L groups of 8-port CSI-RSs in the N-port reference signal pattern is divided into two sub-groups of CSI-RSs, each of the two sub-groups of CSI-RSs is multiplexed using 4 code words of the 4-bit OCC, and each of the two sub-groups of CSI-RSs is mapped to RE positions corresponding to the 4-port CSI-RS, wherein N is 24 or 32.
3. The reference signal mapping method according to claim 2 , wherein the RE positions to which the N-port CSI-RS in the N-port reference signal pattern is mapped are the same as L*P RE positions to which L groups of the 8-port CSI-RSs in the 8-port reference signal pattern are mapped, wherein P is 6 or 8 in the case that N is 18, P is 5 or 8 in the case that N is 20, P is 7 or 8 in the case that N is 28, P is 8 in the case that N is 24, and P is 8 in the case that N is 32.
4. The reference signal mapping method according to claim 1 , wherein in a normal Cyclic Prefix (CP) sub-frame comprising 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols or a Downlink Pilot Time Slot (DwPTS) comprising 11 or 12 OFDM symbols, in the case that M is 4, the 4-port reference signal pattern comprises 10 groups of 4-port CSI-RSs,
wherein each of 4 groups of the 10 groups of 4-port CSI-RSs is mapped to 4 REs on the first to fourth OFDM symbols in a time division multiplexing mode, and each of the remaining 6 groups of 4-port CSI-RSs are mapped to 4 REs on the fifth and sixth OFDM symbols in the time division multiplexing mode in conjunction with a frequency division multiplexing mode, and
wherein the first to fourth OFDM symbols are symbols where DeModulation Reference Signals (DMRSs) are located.
5. The reference signal mapping method according to claim 1 , wherein in a normal CP sub-frame comprising 14 OFDM symbols or a DwPTS comprising 11 or 12 OFDM symbols, in the case that M is 8, the 8-port reference signal pattern comprises 5 groups of 8-port CSI-RSs, and
wherein each of the 5 groups of 8-port CSI-RSs comprises two sub-groups of CSI-RSs, each of the two sub-groups of CSI-RSs is multiplexed using 4 code words of the 4-bit OCC, one of the two sub-groups of CSI-RSs is mapped to 4 REs on the first to fourth OFDM symbols in a time division multiplexing mode, and the other one of the two sub-groups of CSI-RSs is mapped to 4 REs on the fifth and sixth OFDM symbols in the time division multiplexing mode in conjunction with a frequency division multiplexing mode, wherein the first to fourth OFDM symbols are symbols where DMRSs are located; or
each of the 5 groups of 8-port CSI-RSs is mapped to 4 REs on the first to fourth OFDM symbols and 4 REs on the fifth and sixth OFDM symbols in the time division multiplexing mode in conjunction with the frequency division multiplexing mode, wherein the first to fourth OFDM symbols are symbols where DMRSs are located.
6. The reference signal mapping method according to claim 4 , wherein in the normal CP sub-frame comprising 14 OFDM symbols, the first to fourth OFDM symbols are: the sixth and seventh OFDM symbols in a first time slot of the sub-frame, and the sixth and seventh OFDM symbols in a second time slot of the sub-frame, and wherein the fifth and sixth OFDM symbols are the third and fourth OFDM symbols in the second time slot of the sub-frame; or
wherein in the DwPTS comprising 11 or 12 OFDM symbols, the first to fourth OFDM symbols are: the third and fourth OFDM symbols in a first time slot of the sub-frame, and the third and fourth OFDM symbols in a second time slot of the sub-frame, and wherein the fifth and sixth OFDM symbols are the sixth and seventh OFDM symbols in the first time slot of the sub-frame.
7. The reference signal mapping method according to claim 1 , wherein in 12 OFDM symbols of an extended CP sub-frame, each of the plurality of groups of M-port CSI-RSs in the M-port reference signal pattern is mapped to the fifth and sixth OFDM symbols in a first time slot of the sub-frame and the fifth and sixth OFDM symbols in a second time slot of the sub-frame in a time division multiplexing mode in conjunction with a frequency division multiplexing mode.
8. A reference signal mapping device, comprising:
a processor and a memory, wherein the processor is configured to read a program stored in the memory, so as to: determine Resource Elements (REs) to which a Channel State Indication Reference Signal (CSI-RS) is mapped in accordance with an N-port reference signal pattern, N being an integer greater than 16, wherein RE positions to which an N-port CSI-RS in the N-port reference signal pattern is mapped are determined in accordance with RE positions to which a plurality of groups of M-port CSI-RSs in an M-port reference signal pattern are mapped, M being 4 or 8; and
perform resource mapping on the CSI-RS in accordance with the determined REs,
wherein N is 24 or 32, M is 4, the RE positions to which the N-port CSI-RS in the N-port reference signal pattern is mapped are the same as RE positions to which Q groups of 4-port CSI-RSs in a 4-port reference signal pattern are mapped, and each of the Q groups of 4-port CSI-RSs is multiplexed using four code words of a 4-bit Orthogonal Cover Code (OCC), where
Q
=
N
4
;
or
N is 18, 20, 24, 28 or 32, M is 8, the RE positions to which the N-port CSI-RS in the N-port reference signal pattern is mapped are the same as RE positions to which L groups of 8-port CSI-RSs in an 8-port reference signal pattern are mapped, where in the case that N is 18 or 24, L is 3, and in the case that N is 20, 28 or 32, L is 4.
9. The reference signal mapping device according to claim 8 , wherein in the case that M is 8,
every S ports of the N-port CSI-RS are multiplexed using S code words in 8 code words of an 8-bit OCC, wherein S is 6 or 8 in the case that N is 18, S is 5 or 8 in the case that N is 20, S is 7 or 8 in the case that N is 28, S is 8 in the case that N is 24, and S is 8 in the case that N is 32; or
every K ports of the N-port CSI-RS are multiplexed using a K-bit OCC, wherein K is 6 in the case that N is 18, K is 5 in the case that N is 20, and K is 7 in the case that N is 28; or
each of the L groups of 8-port CSI-RSs in the N-port reference signal pattern is divided into two sub-groups of CSI-RSs, each of the two sub-groups of CSI-RSs is multiplexed using 4 code words of the 4-bit OCC, and each of the two sub-groups of CSI-RSs is mapped to RE positions corresponding to the 4-port CSI-RSs, wherein N is 24 or 32.
10. The reference signal mapping device according to claim 9 , wherein the RE positions to which the N-port CSI-RS in the N-port reference signal pattern are mapped is the same as L*P RE positions to which L groups of the 8-port CSI-RSs in the 8-port reference signal pattern are mapped, wherein P is 6 or 8 in the case that N is 18, P is 5 or 8 in the case that N is 20, P is 7 or 8 in the case that N is 28, P is 8 in the case that N is 24, and P is 8 in the case that N is 32.
11. The reference signal mapping device according to claim 8 , wherein in a normal Cyclic Prefix (CP) sub-frame comprising 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols or a Downlink Pilot Time Slot (DwPTS) comprising 11 or 12 OFDM symbols, in the case that M is 4, the 4-port reference signal pattern comprises 10 groups of 4-port CSI-RSs,
wherein each of 4 groups of the 10 groups of 4-port CSI-RSs is mapped to 4 REs on the first to fourth OFDM symbols in a time division multiplexing mode, and each of the remaining 6 groups of 4-port CSI-RSs are mapped to 4 REs on the fifth and sixth OFDM symbols in the time division multiplexing mode in conjunction with a frequency division multiplexing mode, and
wherein the first to fourth OFDM symbols are symbols where DeModulation Reference Signals (DMRSs) are located.
12. The reference signal mapping device according to claim 8 , wherein in a normal CP sub-frame comprising 14 OFDM symbols or a DwPTS comprising 11 or 12 OFDM symbols, in the case that M is 8, the 8-port reference signal pattern comprises 5 groups of 8-port CSI-RSs, and
wherein each of the 5 groups of 8-port CSI-RSs comprises two sub-groups of CSI-RSs, each of the two sub-groups of CSI-RSs is multiplexed using 4 code words of the 4-bit OCC, one of the two sub-groups of CSI-RSs is mapped to 4 REs on the first to fourth OFDM symbols in a time division multiplexing mode, and the other one of the two sub-groups of CSI-RSs is mapped to 4 REs on the fifth and sixth OFDM symbols in the time division multiplexing mode in conjunction with a frequency division multiplexing mode, wherein the first to fourth OFDM symbols are symbols where DMRSs are located; or
each of the 5 groups of 8-port CSI-RSs is mapped to 4 REs on the first to fourth OFDM symbols and 4 REs on the fifth and sixth OFDM symbols in the time division multiplexing mode in conjunction with the frequency division multiplexing mode, wherein the first to fourth OFDM symbols are symbols where DMRSs are located.
13. The reference signal mapping device according to claim 11 , wherein in the normal CP sub-frame comprising 14 OFDM symbols, the first to fourth OFDM symbols are: the sixth and seventh OFDM symbols in a first time slot of the sub-frame, and the sixth and seventh OFDM symbols in a second time slot of the sub-frame, and wherein the fifth and sixth OFDM symbols are the third and fourth OFDM symbols in the second time slot of the sub-frame; or
wherein in the DwPTS comprising 11 or 12 OFDM symbols, the first to fourth OFDM symbols are: the third and fourth OFDM symbols in a first time slot of the sub-frame, and the third and fourth OFDM symbols in a second time slot of the sub-frame, and wherein the fifth and sixth OFDM symbols are the sixth and seventh OFDM symbols in the first time slot of the sub-frame.
14. The reference signal mapping device according to claim 8 , wherein in 12 OFDM symbols of an extended CP sub-frame, each of the plurality of groups of M-port CSI-RSs in the M-port reference signal pattern is mapped to the fifth and sixth OFDM symbols in a first time slot of the sub-frame and the fifth and sixth OFDM symbols in a second time slot of the sub-frame in a time division multiplexing mode in conjunction with a frequency division multiplexing mode.
15. A reference signal mapping method, comprising:
determining Resource Elements (REs) to which a Channel State Indication Reference Signal (CSI-RS) is mapped in accordance with an N-port reference signal pattern, N being an integer greater than 16, wherein RE positions to which an N-port CSI-RS in the N-port reference signal pattern is mapped are determined in accordance with RE positions to which a plurality of groups of M-port CSI-RSs in an M-port reference signal pattern are mapped, M being 4 or 8; and
performing resource mapping on the CSI-RS in accordance with the determined REs,
wherein N is 18, 20, 24, 28 or 32, M is 8, the RE positions to which the N-port CSI-RS in the N-port reference signal pattern is mapped are the same as RE positions to which L groups of 8-port CSI-RSs in an 8-port reference signal pattern are mapped, where in the case that N is 18 or 24, L is 3, and in the case that N is 20, 28 or 32, L is 4,
every S ports of the N-port CSI-RS are multiplexed using S code words in 8 code words of an 8-bit OCC, wherein S is 6 or 8 in the case that N is 18, S is 5 or 8 in the case that N is 20, S is 7 or 8 in the case that N is 28, S is 8 in the case that N is 24, and S is 8 in the case that N is 32; or
every K ports of the N-port CSI-RS are multiplexed using a K-bit OCC, wherein K is 6 in the case that N is 18, K is 5 in the case that N is 20, and K is 7 in the case that N is 28; or
each of the L groups of 8-port CSI-RSs in the N-port reference signal pattern is divided into two sub-groups of CSI-RSs, each of the two sub-groups of CSI-RSs is multiplexed using 4 code words of a 4-bit OCC, and each of the two sub-groups of CSI-RSs is mapped to RE positions corresponding to a 4-port CSI-RS, wherein N is 24 or 32.
16. The reference signal mapping method according to claim 15 , wherein the RE positions to which the N-port CSI-RS in the N-port reference signal pattern is mapped are the same as L*P RE positions to which L groups of the 8-port CSI-RSs in the 8-port reference signal pattern are mapped, wherein P is 6 or 8 in the case that N is 18, P is 5 or 8 in the case that N is 20, P is 7 or 8 in the case that N is 28, P is 8 in the case that N is 24, and P is 8 in the case that N is 32.
17. The reference signal mapping method according to claim 15 , wherein in a normal CP sub-frame comprising 14 OFDM symbols or a DwPTS comprising 11 or 12 OFDM symbols, in the case that M is 8, the 8-port reference signal pattern comprises 5 groups of 8-port CSI-RSs, and
wherein each of the 5 groups of 8-port CSI-RSs comprises two sub-groups of CSI-RSs, each of the two sub-groups of CSI-RSs is multiplexed using 4 code words of the 4-bit OCC, one of the two sub-groups of CSI-RSs is mapped to 4 REs on the first to fourth OFDM symbols in a time division multiplexing mode, and the other one of the two sub-groups of CSI-RSs is mapped to 4 REs on the fifth and sixth OFDM symbols in the time division multiplexing mode in conjunction with a frequency division multiplexing mode, wherein the first to fourth OFDM symbols are symbols where DMRSs are located; or
each of the 5 groups of 8-port CSI-RSs is mapped to 4 REs on the first to fourth OFDM symbols and 4 REs on the fifth and sixth OFDM symbols in the time division multiplexing mode in conjunction with the frequency division multiplexing mode, wherein the first to fourth OFDM symbols are symbols where DMRSs are located.
18. The reference signal mapping method according to claim 17 , wherein in the normal CP sub-frame comprising 14 OFDM symbols, the first to fourth OFDM symbols are: the sixth and seventh OFDM symbols in a first time slot of the sub-frame, and the sixth and seventh OFDM symbols in a second time slot of the sub-frame, and wherein the fifth and sixth OFDM symbols are the third and fourth OFDM symbols in the second time slot of the sub-frame; or
wherein in the DwPTS comprising 11 or 12 OFDM symbols, the first to fourth OFDM symbols are: the third and fourth OFDM symbols in a first time slot of the sub-frame, and the third and fourth OFDM symbols in a second time slot of the sub-frame, and wherein the fifth and sixth OFDM symbols are the sixth and seventh OFDM symbols in the first time slot of the sub-frame.
19. The reference signal mapping method according to claim 15 , wherein in 12 OFDM symbols of an extended CP sub-frame, each of the plurality of groups of M-port CSI-RSs in the M-port reference signal pattern is mapped to the fifth and sixth OFDM symbols in a first time slot of the sub-frame and the fifth and sixth OFDM symbols in a second time slot of the sub-frame in a time division multiplexing mode in conjunction with a frequency division multiplexing mode.