Phase tracking reference signal sending method and receiving method and communication apparatus
A PTRS sending method and receiving method and a communication apparatus. The method includes: a terminal device sends first information to a network device, receives first indication information from the network device, and sends a DFT-s-OFDM symbol to which a PTRS is mapped to the network device. In the method, a rule for mapping the PTRS to a plurality of layers of the DFT-s-OFDM symbol is specified, to ensure phase noise estimation performance and improve a demodulation capability.
1. A communication apparatus, comprising a transceiver and a processor, wherein
the processor is configured to generate first information, wherein the first information indicates a number of first PTRS ports, and the number of first PTRS ports is a number of ports recommended by the communication apparatus; and
the transceiver is configured to send the first information to a network device, receive first indication information from the network device, and send a DFT-s-OFDM symbol to which a PTRS is mapped to the network device, wherein the first indication information is used for determining mapping information of the PTRS on the DFT-s-OFDM symbol, and the mapping information comprises at least one of a number of second PTRS ports scheduled by the network device, a mapping layer of each PTRS port, a number of PTRSs in a PTRS group at a mapping layer, or a number of samples per PTRS group; and a number of PTRS mapping layers is less than or equal to a number of DFT-s-OFDM scheduling layers, the number of PTRS mapping layers is greater than or equal to 1, the number of DFT-s-OFDM scheduling layers is greater than 1, and data is mapped to a location corresponding to a PTRS at a layer to which the PTRS is not mapped at the DFT-s-OFDM scheduling layers.
2. The communication apparatus according to claim 1 , wherein the transceiver is further configured to:
send, second information to the network device, wherein the second information comprises one or more groups of PTRS pattern association parameter thresholds, and PTRS pattern association parameters comprise one or more of the following parameters:
a phase noise model, an operating frequency, the subcarrier spacing, a number of uplink PTRS ports, a channel quality indication (CQI), or a reference signal received power (RSRP).
3. The communication apparatus according to claim 1 , wherein data is mapped by using a modulation symbol corresponding to a transport block size (TBS), the data is punctured at a location of the PTRS at the mapping layer, the PTRS is mapped, and the TBS is obtained based on a total number of resources of the PTRS and a total number of resources of the data; or
a first symbol sequence is sequentially mapped to all scheduling layers, wherein symbols {k, P 0 +k, 2P 0 +k, . . . } in the first symbol sequence are mapped to a k th scheduling layer, P 0 is a total number of scheduling layers, the first symbol sequence is generated after PTRSs at all the scheduling layers and the modulation symbol corresponding to the TBS are re-sorted based on a preset rule, and the TBS is obtained based on the total number of resources of the data.
4. The communication apparatus according to claim 1 , wherein a number of PTRS mapping layers corresponding to the first PTRS port among PTRS ports is greater than 1, and PTRS pattern parameters at the mapping layers corresponding to the first PTRS port are different; and/or PTRS mapping locations at the mapping layers corresponding to the first PTRS port are different.
5. The communication apparatus according to claim 1 , wherein a number of samples per PTRS group mapped to a first layer is greater than a number of samples per PTRS group mapped to a second layer, a difference between channel quality of the first layer and channel quality of the second layer is greater than a preset value, and the preset value is a positive number.
6. The communication apparatus according to claim 5 , wherein the PTRS mapping layers corresponding to the first PTRS port comprise a first layer and a second layer, wherein
a PTRS pattern parameter at the second layer is the same as a PTRS pattern parameter at the first layer, and a PTRS mapping location at the second layer is located in the middle of two adjacent PTRS groups at the first layer.
7. The communication apparatus according to claim 5 , wherein the PTRS mapping layers corresponding to the first PTRS port comprise a first layer and a second layer, and in a unit of PTRS groups, odd-numbered PTRS groups are mapped to the first layer, and even-numbered PTRS groups are mapped to the second layer.
8. The communication apparatus according to claim 5 , wherein the PTRS mapping layers corresponding to the first PTRS port comprise a first layer and a second layer, and after being divided based on the number of PTRS mapping layers, mapped PTRS groups are mapped to the first layer and the second layer in a dispersive manner.
9. The communication apparatus according to claim 5 , wherein the first indication information further indicates an offset value of a PTRS at another layer to which the PTRS is mapped than the first layer relative to an initial time domain location of the PTRS at the first layer.
10. The communication apparatus according to claim 1 , wherein the first indication information comprises a group of PTRS pattern association parameter thresholds, an association relationship between PTRS pattern parameters and the PTRS pattern association parameter thresholds is agreed on or configured in advance, and PTRS pattern association parameters comprise one or more of the following parameters:
a scheduled bandwidth, a modulation and coding scheme MCS, or channel quality.
11. A communication apparatus, comprising a transceiver and a processor, wherein
the transceiver is configured to receive first information from a terminal device, send first indication information determined by the processor to the terminal device, and receive a DFT-s-OFDM symbol to which a PTRS is mapped from the terminal device, wherein the first information indicates a number of first PTRS ports, and the number of first PTRS ports is a number of ports recommended by the terminal device; the first indication information is used for determining mapping information of the PTRS on the DFT-s-OFDM symbol, and the mapping information comprises at least one of a number of second PTRS ports scheduled by the network device, a mapping layer of each PTRS port, a number of PTRSs in a PTRS group at a mapping layer, or a number of samples per PTRS group; and a number of PTRS mapping layers is less than or equal to a number of DFT-s-OFDM scheduling layers, the number of PTRS mapping layers is greater than or equal to 1, the number of DFT-s-OFDM scheduling layers is greater than 1, and data is mapped to a location corresponding to a PTRS at a layer to which the PTRS is not mapped at the DFT-s-OFDM scheduling layers.
12. The communication apparatus according to claim 11 , wherein the transceiver is further configured to:
send, second information to the network device, wherein the second information comprises one or more groups of PTRS pattern association parameter thresholds, and PTRS pattern association parameters comprise one or more of the following parameters:
a phase noise model, an operating frequency, the subcarrier spacing, a number of uplink PTRS ports, a channel quality indication (CQI), or a reference signal received power (RSRP).
13. The communication apparatus according to claim 11 , wherein data is mapped by using a modulation symbol corresponding to a transport block size (TBS), the data is punctured at a location of the PTRS at the mapping layer, the PTRS is mapped, and the TBS is obtained based on a total number of resources of the PTRS and a total number of resources of the data; or
a first symbol sequence is sequentially mapped to all scheduling layers, wherein symbols {k, P 0 +k, 2P 0 +k, . . . } in the first symbol sequence are mapped to a k th scheduling layer, P 0 is a total number of scheduling layers, the first symbol sequence is generated after PTRSs at all the scheduling layers and the modulation symbol corresponding to the transport block size-TBS are re-sorted based on a preset rule, and the TBS is obtained based on the total number of resources of the data.
14. The communication apparatus according to claim 11 , wherein a number of PTRS mapping layers corresponding to the first PTRS port among PTRS ports is greater than 1, and PTRS pattern parameters at the mapping layers corresponding to the first PTRS port are different; and/or PTRS mapping locations at the mapping layers corresponding to the first PTRS port are different.
15. The communication apparatus according to claim 14 , wherein a number of samples per PTRS group mapped to a first layer is greater than a number of samples per PTRS group mapped to a second layer, a difference between channel quality of the first layer and channel quality of the second layer is greater than a preset value, and the preset value is a positive number.
16. The communication apparatus according to claim 14 , wherein the PTRS mapping layers corresponding to the first PTRS port comprise a first layer and a second layer, wherein
a PTRS pattern parameter at the second layer is the same as a PTRS pattern parameter at the first layer, and a PTRS mapping location at the second layer is located in the middle of two adjacent PTRS groups at the first layer.
17. The communication apparatus according to claim 14 , wherein the PTRS mapping layers corresponding to the first PTRS port comprise a first layer and a second layer, and in a unit of PTRS groups, odd-numbered PTRS groups are mapped to the first layer, and even-numbered PTRS groups are mapped to the second layer.
18. The communication apparatus according to claim 14 , wherein the PTRS mapping layers corresponding to the first PTRS port comprise a first layer and a second layer, and after being divided based on the number of PTRS mapping layers, mapped PTRS groups are mapped to the first layer and the second layer in a dispersive manner.
19. The communication apparatus according to claim 14 , wherein the first indication information further indicates an offset value of a PTRS at another layer to which the PTRS is mapped than the first layer relative to an initial time domain location of the PTRS at the first layer.
20. The communication apparatus according to claim 11 , wherein the first indication information comprises a group of PTRS pattern association parameter thresholds, an association relationship between PTRS pattern parameters and the PTRS pattern association parameter thresholds is agreed on or configured in advance, and PTRS pattern association parameters comprise one or more of the following parameters:
a scheduled bandwidth, a modulation and coding scheme (MCS), or channel quality.