Communication method and apparatus

Abstract

This application provides a communication method and apparatus, and relates to the field of communications technologies. The method includes: receiving first indication information sent by a network device, where the first indication information is used to indicate a time domain position of a DMRS set on a PDSCH; and the DMRS set includes N DMRSs, where a quantity of candidate PDSCHs that meet a first condition in M candidate PDSCHs of the PDSCH is greater than or equal to a first threshold; receiving second indication information sent by the network device, where the second indication information is used to indicate a first PDSCH; and receiving, on the first PDSCH based on the first indication information and the second indication information, data sent by the network device. This technical solution helps reduce mutual interference between a DMRS in NR and a CRS in LTE in communication and improve transmission performance.

Description

A communication method and apparatus

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 201910760916.X, filed on August 16, 2019, entitled "A Communication Method and Apparatus", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of communication technology, and in particular to a communication method and apparatus. Background Technology

[0004] Currently, 5G New Radio (NR) supports sharing spectrum resources with Long Term Evolution (LTE). In 5G NR, the symbols used for time-domain resources for physical downlink shared channel (PDSCH) transmission can be dynamically changed. For example, it can start from the first symbol in a time slot or subframe or any other arbitrary symbol, and the ending symbol can also be at any position in a time slot or subframe.

[0005] How to configure the temporal position of the demodulation reference signal (DMRS) on the PDSCH in 5G NR to reduce interference with the cell specific reference signal (CRS) in LTE remains to be studied.

[0006] Summary of the Invention

[0007] This application provides a communication method and apparatus that helps reduce mutual interference between DMRS and CRS during communication and improve transmission performance when LTE and NR share spectrum.

[0008] A first aspect is a communication method provided in an embodiment of this application, the method comprising:

[0009] The system receives first indication information sent by a network device; the first indication information is used to indicate the time-domain position of the DMRS set on the PDSCH; the DMRS set includes N DMRS; wherein, among the M candidate PDSCHs of the PDSCH, the number of candidate PDSCHs that meet a first condition is greater than or equal to a first threshold; the first condition is: on the candidate PDSCH, the time-domain position of the candidate DMRS set obtained based on the first indication information does not coincide with the time-domain position of the cell common signal (CRS) set on the candidate PDSCH; N and M are positive integers greater than or equal to 2.

[0010] The network device receives a second indication message, which indicates a first PDSCH; the first PDSCH is a candidate PDSCH that meets the first condition among the M candidate PDSCHs.

[0011] Based on the first indication information and the second indication information, data sent by the network device is received on the first PDSCH.

[0012] In this embodiment, since the time-domain position of the DMRS set indicated by the first indication information on the PDSCH makes the number of candidate PDSCHs that meet the first condition greater than or equal to the first threshold, when LTE and NR share spectrum resources, it helps to ensure that the time-domain position of the DMRS set on the first PDSCH indicated by the second indication information does not coincide with the time-domain position of the CRS set, thereby reducing mutual interference between DMRS and CRS in NR and LTE communication and improving transmission performance.

[0013] In one possible design, among the M candidate PDSCHs, the number of candidate PDSCHs that meet the second condition is less than or equal to a second threshold; the second condition is that the temporal position of the candidate DMRS set obtained based on the first indication information on the candidate PDSCH overlaps with the temporal position of the CRS set on the candidate PDSCH. This helps to further ensure that the temporal position of the DMRS set indicated by the first indication information on the PDSCH does not overlap with the temporal position of the CRS set on the first PDSCH indicated by the second indication information.

[0014] In one possible design, the frame structure parameters corresponding to the DMRS set are: 15kHz subcarrier spacing, 30kHz subcarrier spacing, 60kHz subcarrier spacing, or 120kHz subcarrier spacing.

[0015] In one possible design, the frame structure parameter corresponding to the CRS set is: 15kHz subcarrier spacing.

[0016] In one possible design, the length of the DMRS in the N DMRS in the time domain is one orthogonal frequency division multiplexing OFDM symbol or K consecutive OFDM symbols, where K is a positive integer greater than or equal to 2.

[0017] In one possible design, the PDSCH has a time domain length of L OFDM symbols, where L is a positive integer greater than or equal to a second threshold.

[0018] In one possible design, N is 2, then the DMRS set includes a first DMRS and a second DMRS, and the first indication information is specifically used to indicate:

[0019] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl, Δl is 7; or...

[0020] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl, and Δl is 8; or...

[0021] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl, and Δl is 7; or...

[0022] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl, and Δl is 8; or...

[0023] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l, △l is 9;

[0024] Wherein, L is used to indicate the total number of symbols in the PDSCH; l0 is used to indicate the starting symbol of the PDSCH, and l0 is used to indicate the starting symbol of the first DMRS on the PDSCH; Δl is used to indicate the number of symbols that differ between the starting symbol of the first DMRS and the starting symbol of the second DMRS; l0+Δl is used to indicate the starting symbol of the second DMRS on the PDSCH.

[0025] This helps improve the reliability of channel estimation.

[0026] In one possible design, N is 3, then the DMRS set includes a first DMRS, a second DMRS, and a third DMRS, and the first indication information is specifically used to indicate:

[0027] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 7; or...

[0028] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, and Δl2 is 7; or...

[0029] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 8; or...

[0030] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, and Δl2 is 8; or...

[0031] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 7; or...

[0032] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, and Δl2 is 7; or...

[0033] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 8; or...

[0034] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, △l1 is 3, △l2 is 8;

[0035] Wherein, L is used to indicate the total number of symbols in the PDSCH; l0 is used to indicate the starting symbol of the PDSCH, and l0 is used to indicate the starting symbol of the first DMRS on the PDSCH; Δl1 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the second DMRS; Δl2 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the third DMRS; l0+Δl1 is used to indicate the starting symbol of the second DMRS on the PDSCH; and l0+Δl2 is used to indicate the starting symbol of the third DMRS on the PDSCH.

[0036] This helps improve the reliability of channel estimation.

[0037] In one possible design, N is 4, then the DMRS set includes a first DMRS, a second DMRS, a third DMRS, and a fourth DMRS;

[0038] The first indication information is specifically used to indicate:

[0039] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, and △l3 is 8; or...

[0040] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, and △l3 is 8; or...

[0041] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 2, △l2 is 4, and △l3 is 7; or...

[0042] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 2, △l2 is 4, △l3 is 7;

[0043] Wherein, L is used to indicate the total number of symbols in the PDSCH; l0 is used to indicate the starting symbol of the PDSCH, and l0 is used to indicate the starting symbol of the first DMRS on the PDSCH; △l1 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the second DMRS; △l2 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the third DMRS; △l3 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the fourth DMRS; l0+△l1 is used to indicate the starting symbol of the second DMRS on the PDSCH; l0+△l2 is used to indicate the starting symbol of the third DMRS on the PDSCH; l0+△l3 is used to indicate the starting symbol of the fourth DMRS on the PDSCH.

[0044] This helps improve the reliability of channel estimation.

[0045] Secondly, another communication method provided in the embodiments of this application includes:

[0046] The network device receives first indication information; the first indication information is used to indicate the time domain position of the demodulation reference signal (DMRS) set on the physical downlink shared channel (PDSCH); the DMRS set includes N DMRSs.

[0047] Receive a second indication information sent by the network device, the second indication information being used to schedule the PDSCH;

[0048] Based on the first indication information and the second indication information, data sent by the network device is received on the PDSCH;

[0049] When N is 2, the DMRS set includes a first DMRS and a second DMRS, and the first indication information is specifically used to indicate:

[0050] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl, Δl is 7; or...

[0051] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl, and Δl is 8; or...

[0052] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl, and Δl is 7; or...

[0053] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl, and Δl is 8; or...

[0054] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l, △l is 9;

[0055] Wherein, L indicates the total number of symbols in the PDSCH; l0 indicates the start symbol of the PDSCH, and l0 also indicates the start symbol of the first DMRS on the PDSCH; Δl indicates the number of symbols that differ between the start symbols of the first DMRS and the start symbols of the second DMRS; l0+Δl indicates the start symbol of the second DMRS on the PDSCH; or,

[0056] When N is 3, the DMRS set includes a first DMRS, a second DMRS, and a third DMRS, and the first indication information is specifically used to indicate:

[0057] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 7; or...

[0058] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, and Δl2 is 7; or...

[0059] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 8; or...

[0060] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, and Δl2 is 8; or...

[0061] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 7; or...

[0062] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, and Δl2 is 7; or...

[0063] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 8; or...

[0064] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, △l1 is 3, △l2 is 8;

[0065] Wherein, L indicates the total number of symbols in the PDSCH; l0 indicates the start symbol of the PDSCH, and l0 also indicates the start symbol of the first DMRS on the PDSCH; Δl1 indicates the number of symbols between the start symbols of the first DMRS and the second DMRS; Δl2 indicates the number of symbols between the start symbols of the first DMRS and the third DMRS; l0+Δl1 indicates the start symbol of the second DMRS on the PDSCH; l0+Δl2 indicates the start symbol of the third DMRS on the PDSCH; or,

[0066] When N is 4, the DMRS set includes a first DMRS, a second DMRS, a third DMRS, and a fourth DMRS, and the first indication information is specifically used to indicate:

[0067] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, and △l3 is 8; or...

[0068] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, and △l3 is 8; or...

[0069] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 2, △l2 is 4, and △l3 is 7; or...

[0070] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 2, △l2 is 4, △l3 is 7;

[0071] Wherein, L is used to indicate the total number of symbols in the PDSCH; l0 is used to indicate the starting symbol of the PDSCH, and l0 is used to indicate the starting symbol of the first DMRS on the PDSCH; △l1 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the second DMRS; △l2 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the third DMRS; △l3 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the fourth DMRS; l0+△l1 is used to indicate the starting symbol of the second DMRS on the PDSCH; l0+△l2 is used to indicate the starting symbol of the third DMRS on the PDSCH; l0+△l3 is used to indicate the starting symbol of the fourth DMRS on the PDSCH.

[0072] Thirdly, another communication method provided in the embodiments of this application includes:

[0073] Send first indication information to the terminal device; the first indication information is used to indicate the time domain position of the demodulation reference signal (DMRS) set on the physical downlink shared channel (PDSCH); the DMRS set includes N DMRSs;

[0074] Wherein, among the M candidate PDSCHs of the PDSCH, the number of candidate PDSCHs that meet the first condition is greater than or equal to the first threshold; the first condition is: on the candidate PDSCH, the time domain position of the candidate DMRS set obtained based on the first indication information does not coincide with the time domain position of the cell common signal CRS set on the candidate PDSCH; N and M are positive integers greater than or equal to 2.

[0075] Send a second indication message to the terminal device, the second indication message being used to indicate a first PDSCH; the first PDSCH is the PDSCH among the M candidate PDSCHs that satisfies the first condition;

[0076] Data is sent to the terminal device on the first PDSCH.

[0077] In one possible design, among the M candidate PDSCHs, the number of candidate PDSCHs that meet the second condition is less than or equal to the second threshold; the second condition is that the temporal position of the candidate DMRS set obtained based on the first indication information on the candidate PDSCH overlaps with the temporal position of the CRS set on the candidate PDSCH.

[0078] In one possible design, the frame structure parameters corresponding to the DMRS set are: 15kHz subcarrier spacing, 30kHz subcarrier spacing, 60kHz subcarrier spacing, or 120kHz subcarrier spacing.

[0079] In one possible design, the frame structure parameter corresponding to the CRS set is: 15kHz subcarrier spacing.

[0080] In one possible design, the length of one of the N DMRSs in the time domain is one orthogonal frequency division multiplexing (OFDM) symbol or K consecutive OFDM symbols, where K is a positive integer greater than or equal to 2.

[0081] In one possible design, the PDSCH has a time domain length of L OFDM symbols, where L is a positive integer greater than or equal to a second threshold.

[0082] In one possible design, N is 2, then the DMRS set includes a first DMRS and a second DMRS, and the first indication information is specifically used to indicate:

[0083] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl, Δl is 7; or...

[0084] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl, and Δl is 8; or...

[0085] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl, and Δl is 7; or...

[0086] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl, and Δl is 8; or...

[0087] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l, △l is 9;

[0088] Wherein, L is used to indicate the total number of symbols in the PDSCH; l0 is used to indicate the starting symbol of the PDSCH, and l0 is used to indicate the starting symbol of the first DMRS on the PDSCH; Δl is used to indicate the number of symbols that differ between the starting symbol of the first DMRS and the starting symbol of the second DMRS; l0+Δl is used to indicate the starting symbol of the second DMRS on the PDSCH.

[0089] In one possible design, N is 3, then the DMRS set includes a first DMRS, a second DMRS, and a third DMRS, and the first indication information is specifically used to indicate:

[0090] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 7; or...

[0091] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, and Δl2 is 7; or...

[0092] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 8; or...

[0093] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, and Δl2 is 8; or...

[0094] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 7; or...

[0095] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, and Δl2 is 7; or...

[0096] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 8; or...

[0097] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, and Δl2 is 8; or...

[0098] Wherein, L is used to indicate the total number of symbols in the PDSCH; l0 is used to indicate the starting symbol of the PDSCH, and l0 is used to indicate the starting symbol of the first DMRS on the PDSCH; Δl1 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the second DMRS; Δl2 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the third DMRS; l0+Δl1 is used to indicate the starting symbol of the second DMRS on the PDSCH; and l0+Δl2 is used to indicate the starting symbol of the third DMRS on the PDSCH.

[0099] In one possible design, N is 4, then the DMRS set includes a first DMRS, a second DMRS, a third DMRS, and a fourth DMRS;

[0100] The first indication information is specifically used to indicate:

[0101] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, and △l3 is 8; or...

[0102] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, and △l3 is 8; or...

[0103] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 2, △l2 is 4, and △l3 is 7; or...

[0104] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 2, △l2 is 4, △l3 is 7;

[0105] Wherein, L is used to indicate the total number of symbols in the PDSCH; l0 is used to indicate the starting symbol of the PDSCH, and l0 is used to indicate the starting symbol of the first DMRS on the PDSCH; △l1 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the second DMRS; △l2 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the third DMRS; △l3 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the fourth DMRS; l0+△l1 is used to indicate the starting symbol of the second DMRS on the PDSCH; l0+△l2 is used to indicate the starting symbol of the third DMRS on the PDSCH; l0+△l3 is used to indicate the starting symbol of the fourth DMRS on the PDSCH.

[0106] Fourthly, another communication method provided in the embodiments of this application includes:

[0107] First indication information is sent to the terminal device; the first indication information is used to indicate the time domain position of the demodulation reference signal (DMRS) set on the physical downlink shared channel (PDSCH); the DMRS set includes N DMRS;

[0108] A second indication information is sent to the terminal device, the second indication information being used to schedule the PDSCH;

[0109] Data sent to the terminal device on the PDSCH;

[0110] When N is 2, the DMRS set includes a first DMRS and a second DMRS, and the first indication information is specifically used to indicate:

[0111] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl, Δl is 7; or...

[0112] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl, and Δl is 8; or...

[0113] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl, and Δl is 8; or...

[0114] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl, and Δl is 8; or...

[0115] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l, △l is 9;

[0116] Wherein, L indicates the total number of symbols in the PDSCH; l0 indicates the start symbol of the PDSCH, and l0 also indicates the start symbol of the first DMRS on the PDSCH; Δl indicates the number of symbols that differ between the start symbols of the first DMRS and the start symbols of the second DMRS; l0+Δl indicates the start symbol of the second DMRS on the PDSCH; or,

[0117] When N is 3, the DMRS set includes a first DMRS, a second DMRS, and a third DMRS, and the first indication information is specifically used to indicate:

[0118] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 7; or...

[0119] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, and Δl2 is 7; or...

[0120] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 8; or...

[0121] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, and Δl2 is 8; or...

[0122] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 7; or...

[0123] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, and Δl2 is 7; or...

[0124] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, and Δl2 is 8; or...

[0125] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, △l1 is 3, △l2 is 8;

[0126] Wherein, L indicates the total number of symbols in the PDSCH; l0 indicates the start symbol of the PDSCH, and l0 also indicates the start symbol of the first DMRS on the PDSCH; Δl1 indicates the number of symbols between the start symbols of the first DMRS and the second DMRS; Δl2 indicates the number of symbols between the start symbols of the first DMRS and the third DMRS; l0+Δl1 indicates the start symbol of the second DMRS on the PDSCH; l0+Δl2 indicates the start symbol of the third DMRS on the PDSCH; or,

[0127] When N is 4, the DMRS set includes a first DMRS, a second DMRS, a third DMRS, and a fourth DMRS, and the first indication information is specifically used to indicate:

[0128] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, and △l3 is 8; or...

[0129] The PDSCH mapping type is type B, where L is 10, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, and △l3 is 8; or...

[0130] The PDSCH mapping type is type B, where L is 9, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 2, △l2 is 4, and △l3 is 7; or...

[0131] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 2, △l2 is 4, △l3 is 7;

[0132] Wherein, L is used to indicate the total number of symbols in the PDSCH; l0 is used to indicate the starting symbol of the PDSCH, and l0 is used to indicate the starting symbol of the first DMRS on the PDSCH; △l1 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the second DMRS; △l2 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the third DMRS; △l3 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the fourth DMRS; l0+△l1 is used to indicate the starting symbol of the second DMRS on the PDSCH; l0+△l2 is used to indicate the starting symbol of the third DMRS on the PDSCH; l0+△l3 is used to indicate the starting symbol of the fourth DMRS on the PDSCH.

[0133] Fifthly, embodiments of this application provide an apparatus comprising a processor for implementing the method described in the first aspect above. The apparatus may further include a memory for storing instructions and data. The memory is coupled to the processor, and when the processor executes the program instructions stored in the memory, it can implement the methods described in the above aspects and any possible designs of each aspect. The apparatus may also include a communication interface for communicating with other devices. Exemplarily, the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface, and the other devices may be network devices or terminal devices, etc.

[0134] In one possible design, the device includes:

[0135] Memory, used to store program instructions;

[0136] A processor is configured to invoke instructions stored in memory to cause the device to execute the method of the first aspect of the present application and any possible design of the first aspect, or to cause the device to execute the method of the second aspect of the present application, or the method of the third aspect of the present application and any possible design of the third aspect, or to cause the device to execute the method of the fourth aspect of the present application.

[0137] In a sixth aspect, embodiments of this application also provide a computer-readable storage medium including instructions that, when executed on a computer, cause the computer to perform the method of the first aspect and any possible design of the first aspect, or the method of the second aspect, or the method of the third aspect and any possible design of the third aspect, or cause the apparatus to perform the method of the fourth aspect of the present application.

[0138] In a seventh aspect, embodiments of this application also provide a chip system, which includes a processor and may further include a memory, for implementing the first aspect and any possible design of the first aspect, or the design of the second aspect, or the third aspect and any possible design of the third aspect of this application, or causing the device to execute the design of the fourth aspect of this application. The chip system may be composed of chips or may include chips and other discrete devices.

[0139] Eighthly, this application also provides a computer program product, including instructions that, when run on a computer, cause the computer to perform the method of the first aspect and any possible design of the first aspect, or the method of the second aspect, or the method of the third aspect and any possible design of the third aspect, or cause the device to perform the method of the fourth aspect of the application.

[0140] Furthermore, the technical effects of any of the possible design methods in aspects two through eight can be found in the section on the technical effects of different design methods, and will not be repeated here. Attached Figure Description

[0141] Figure 1 is a schematic diagram of RB according to an embodiment of this application;

[0142] Figure 2A is a schematic diagram of a subframe in LTE;

[0143] Figure 2B is a schematic diagram of another subframe in LTE;

[0144] Figure 3 is a schematic diagram of a time slot in NR;

[0145] Figure 4 is a schematic diagram of scheduling PDSCH of different durations on a time slot in an embodiment of this application;

[0146] Figure 5 is a schematic diagram of the DMRS pattern in the embodiment of this application;

[0147] Figure 6 is a schematic diagram of the CRS pattern under different numbers of antenna ports in the embodiments of this application;

[0148] Figure 7 is a schematic diagram of the network architecture of the communication system according to an embodiment of this application;

[0149] Figure 8 is a flowchart illustrating a communication method according to an embodiment of this application;

[0150] Figure 9 is a schematic diagram of the temporal location of CRS in a subframe according to an embodiment of this application;

[0151] Figures 10A to 10H are schematic diagrams of candidate PDSCHs in different scenarios according to the embodiments of this application;

[0152] Figures 11A to 11H are schematic diagrams of candidate PDSCHs in another different scenario according to the embodiments of this application;

[0153] Figures 12A to 12H are schematic diagrams of candidate PDSCHs in another different scenario according to the embodiments of this application;

[0154] Figures 13A to 13H are schematic diagrams of candidate PDSCHs under different scenarios in this application;

[0155] Figures 14A to 14F are schematic diagrams of candidate PDSCHs under different scenarios in this application;

[0156] Figures 15A to 15F are schematic diagrams of candidate PDSCHs under different scenarios in this application;

[0157] Figures 16A to 16F are schematic diagrams of candidate PDSCHs under different scenarios in this application;

[0158] Figures 17A to 17F are schematic diagrams of candidate PDSCHs under different scenarios in this application;

[0159] Figure 18 is a flowchart illustrating another communication method according to an embodiment of this application;

[0160] Figure 19 is a schematic diagram of the structure of a communication device according to an embodiment of this application;

[0161] Figure 20 is a schematic diagram of the structure of another communication device according to an embodiment of this application. Detailed Implementation

[0162] In the embodiments of this application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, a and b, a and c, b and c, or a, b, and c, where each of a, b, and c can be an element itself or a set containing one or more elements.

[0163] In this application, terms such as "exemplary," "in some embodiments," and "in other embodiments" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the term "exemplary" is used to present the concept in a specific manner.

[0164] In this application, the terms "of," "relevant," and "corresponding" may sometimes be used interchangeably. It should be noted that, unless a distinction is emphasized, their meanings are consistent. Similarly, in the embodiments of this application, "communication" and "transmission" may sometimes be used interchangeably. It should be noted that, unless a distinction is emphasized, their meanings are consistent. For example, transmission can include sending and / or receiving, and can be a noun or a verb.

[0165] It should be noted that the terms "first" and "second" used in the embodiments of this application are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance or order.

[0166] The following explanations of some terms used in the embodiments of this application are provided to facilitate understanding by those skilled in the art.

[0167] 1. Terminal Equipment. In this application embodiment, the terminal equipment is a device with wireless transceiver capabilities, which may be referred to as a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), vehicle-mounted terminal equipment, remote station, remote terminal equipment, etc. Specific forms of the terminal equipment may include mobile phones, cellular phones, cordless phones, session initiation protocol (SIP) phones, wearable devices, tablets, desktop computers, laptops, all-in-one computers, vehicle-mounted terminals, wireless local loop (WLL) stations, personal digital assistants (PDAs), etc. The terminal equipment can be applied to the following scenarios: virtual reality (VR), augmented reality (AR), industrial control, self-driving, remote medical surgery, smart grid, transportation safety, smart city, smart home, etc. The terminal equipment can be fixed or mobile. It should be noted that the terminal device can support at least one wireless communication technology, such as LTE, NR, wideband code division multiple access (WCDMA), etc.

[0168] 2. Network Equipment. In this embodiment, the network equipment is a device that provides wireless communication functions for terminal devices, and can also be referred to as a radio access network (RAN) device. Network equipment includes, but is not limited to: next-generation node B (gNB), evolved node B (eNB), baseband unit (BBU), transmitting and receiving point (TRP), transmitting point (TP), relay station, access point, etc., in 5G. Network equipment can also be a radio controller, centralized unit (CU), distributed unit (DU), etc., in a cloud radio access network (CRAN) scenario. The network equipment can support at least one wireless communication technology, such as LTE, NR, WCDMA, etc.

[0169] 3. Frame Structure Parameters. Frame structure parameters, also known as system parameters or numberology, may include subcarrier spacing (SCS) and / or cyclic prefix (CP) type. For example, NR supports different subcarrier spacings, such as 15kHz, 30kHz, 60kHz, 120kHz, or 240kHz. For example, LTE typically supports a 15kHz subcarrier spacing.

[0170] 4. Symbols. The symbols used in this application refer to Orthogonal Frequency Division Multiplexing (OFDM) symbols, which are typically used for data transmission in the time domain at the symbol level. The duration of one symbol is equal to 1 / subcarrier spacing. For example, LTE supports a 15kHz subcarrier spacing, so the duration of one symbol in LTE is 1 / 15kHz = 66.7µs. In NR, different subcarrier spacings are supported; therefore, the duration of symbols corresponding to different subcarrier spacings is also different. For example, the duration of a symbol corresponding to a 30kHz subcarrier spacing is 1 / 30kHz = 33.3µs.

[0171] 5. Resource Block (RB). In LTE, resource scheduling is performed at a granular level of 2 RBs. For example, as shown in Figure 1, an RB comprises 7 symbols in the time domain and 12 subcarriers in the frequency domain, with a subcarrier spacing of 15kHz. Specifically, in LTE, 7 symbols can form a time slot, and 14 symbols can form a subframe. The smallest resource granularity used for data transmission is the resource element (RE), as shown in the shaded area in Figure 1, which comprises one subcarrier in the frequency domain and one symbol in the time domain. Furthermore, in LTE, resource scheduling in the time domain is performed at the subframe level, while the smallest time granularity used for data transmission in the time domain is the symbol. Therefore, to easily distinguish different symbols within a subframe, the different symbols within a subframe can be identified sequentially according to time. For example, different symbols can be identified by subframes, as shown in Figure 2A. In LTE, subframe i includes 14 symbols: symbol 0, symbol 1, symbol 2, symbol 3, symbol 4, symbol 5, symbol 6, symbol 7, symbol 8, symbol 9, symbol 10, symbol 11, symbol 12, and symbol 13. As another example, different symbols can be identified by time slots, as shown in Figure 2B. In LTE, subframe i includes time slot 0 and time slot 1. Time slot 0 includes 7 symbols: symbol 0, symbol 1, symbol 2, symbol 3, symbol 4, symbol 5, and symbol 6; time slot 1 includes 7 symbols: symbol 0, symbol 1, symbol 2, symbol 3, symbol 4, symbol 5, and symbol 6. Here, i is the subframe number, which can be a positive integer such as 0, 1, or 2.

[0172] 6. Time Slots. In LTE, a time slot includes 7 symbols. In NR, the number of symbols in a time slot is related to the CP type. For a normal CP, a time slot includes 14 symbols; for an extended CP, a time slot includes 12 symbols. It should be noted that the communication method in this embodiment is applied to a scenario where the CP type is normal. Furthermore, in NR, resource scheduling is performed in the time domain at the time slot level. The smallest time granularity for data transmission in the time domain is the symbol. Therefore, to easily distinguish different symbols in a time slot, different symbols in a time slot can be identified sequentially according to time order. For example, as shown in Figure 3, in NR, time slot j includes 14 symbols, namely symbol 0, symbol 1, symbol 2, symbol 3, symbol 4, symbol 5, symbol 6, symbol 7, symbol 8, symbol 9, symbol 10, symbol 11, symbol 12, and symbol 13, where j is the time slot number, which can be a positive integer such as 0, 1, or 2.

[0173] 7. PDSCH. PDSCH is used to carry downlink data. In NR, PDSCH is typically scheduled within a single time slot in the time domain. That is, the length of the PDSCH in the time domain (i.e., the total number of symbols in the PDSCH, hereinafter referred to as the PDSCH duration) does not exceed the length of one time slot. For example, if a time slot in NR includes 14 symbols, then the PDSCH duration cannot exceed 14 symbols, and can be 2, 3, 4, 6, 8, 9, or 10 symbols, etc. Taking a PDSCH duration of 9 symbols as an example, this PDSCH can also be called a 9-symbol PDSCH. Taking a PDSCH duration of 3 symbols as an example, this PDSCH can also be called a 3-symbol PDSCH.

[0174] 8. Candidate PDSCH. In NR, a candidate PDSCH can be understood as a PDSCH that may be scheduled within a time slot. The probability of a PDSCH being scheduled within a time slot varies depending on its duration; therefore, the number of candidate PDSCHs can differ for different durations. For example, for a 9-symbol PDSCH, there are a maximum of 6 candidate PDSCHs. Similarly, for a 10-symbol PDSCH, there are a maximum of 5 candidate PDSCHs. Taking time slot j as shown in Figure 3 as an example, for a 10-symbol PDSCH, there are a maximum of 5 candidate PDSCHs: candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, candidate PDSCH4, and candidate PDSCH5. Among them, the starting symbol of candidate PDSCH1 is symbol 0 of time slot j, the starting symbol of candidate PDSCH2 is symbol 1 of time slot j, the starting symbol of candidate PDSCH3 is symbol 2 of time slot j, the starting symbol of candidate PDSCH4 is symbol 3 of time slot j, and the starting symbol of candidate PDSCH5 is symbol 4 of time slot j.

[0175] 9. DMRS. In NR, DMRS can be used by terminal equipment for next-channel estimation. The subcarrier occupied by a DMRS on a symbol is related to the DMRS type and the code division multiplexing (CDM) group number indicated by the DCI. Furthermore, the time-domain length of a DMRS can be one symbol or K consecutive symbols, where K can be 2 or a positive integer greater than 2. It should be noted that when the time-domain length of a DMRS is one symbol, it can be called a single-symbol DMRS or a 1-symbol DMRS, etc. When the time-domain length of a DMRS is two consecutive symbols, it can be called a double-symbol DMRS or a 2-symbol DMRS, etc. In NR, one or more DMRS can be configured on the PDSCH. Specifically, the number of DMRS configured on the PDSCH is related to the duration of the PDSCH. Generally, when channel conditions change rapidly, the longer the PDSCH duration, the more DMRSs need to be configured for the PDSCH. In scenarios with rapidly changing channels, this helps improve the accuracy of downlink channel estimation by the terminal equipment. For example, if the PDSCH duration is 2 or 4 symbols, one DMRS can be configured. For instance, the time-domain position of this DMRS on the PDSCH can be the start symbol of the PDSCH. As shown in Figure 4, the duration of PDSCH1 is 2 symbols, and the time-domain position of the 1-symbol DMRS on PDSCH1 is the start symbol of PDSCH1, which is symbol 1 in time slot j. Furthermore, if the PDSCH duration is 9 or 10 symbols, 2, 3, or 4 DMRSs can be configured. For example, as shown in Figure 4, PDSCH2 has a duration of 9 symbols and is configured with 3 1-symbol DMRSs. The time-domain positions of these 3 1-symbol DMRSs are the start symbol, the 3rd symbol, and the 7th symbol of PDSCH2, respectively. The start symbol of PDSCH2 is symbol 5 in time slot j, the 3rd symbol is symbol 7 in time slot j, and the 7th symbol is symbol 11 in time slot j. The DMRS located at symbol 5 in time slot j is the first DMRS on PDSCH2 in the time domain, and can be referred to as the first DMRS on PDSCH2. The DMRS located at symbols 7 and 11 can be referred to as additional DMRSs. It should be understood that any DMRS on PDSCH other than the DMRS located at the start symbol of PDSCH can be called additional DMRSs.

[0176] In the time domain, the position of the first DMRS on the PDSCH is related to the PDSCH mapping type. In NR, the PDSCH mapping type includes type A or type B. Taking scheduling PDSCH on slot i as an example, i can be a positive integer such as 0, 1, or 2. For the PDSCH mapping type type A, in the time domain, the position of the first DMRS on the PDSCH can be symbol 2 or symbol 3 in slot i, while the starting symbol of the PDSCH can be symbol 0, symbol 1, symbol 2, or symbol 3 in slot i, generally no later than the position of the first DMRS. Under this mapping type, the duration of the PDSCH can be a minimum of 3 symbols and a maximum of 14 symbols. For PDSCH mapping type B, the time domain position of the first DMRS on PDSCH is the starting symbol of PDSCH, and the starting symbol of PDSCH can be any symbol from symbol 0 to symbol 12 in time slot i, which is related to the scheduling of network devices; under this mapping type, the duration of PDSCH can be 2 symbols, 4 symbols, 7 symbols, 9 symbols or 10 symbols, etc.

[0177] Furthermore, the DMRS pattern differs for different PDSCH mapping types. For example, taking a 1-symbol DMRS, for PDSCH mapping type type A, when the CDM group number is 0 or 1, the DMRS's subcarrier pattern on one symbol can be shown in Figure 5a. From Figure 5a, it can be seen that when the CDM group number is 0, the DMRS occupies subcarriers 0, 2, 4, 6, 8, and 10 on one symbol. When the CDM group number is 1, the DMRS occupies subcarriers 1, 3, 5, 7, 9, and 11 on one symbol. As another example, taking a 2-symbol DMRS, for PDSCH mapping type type A, when the CDM group number is 0 or 1, the DMRS's subcarrier pattern across two consecutive symbols can be shown in Figure 5b. From Figure 5b, it can be seen that when the CDM group number is 0, the DMRS occupies subcarriers 0, 2, 4, 6, 8, and 10 across the two symbols. When the CDM group number is 1, the subcarriers occupied by the DMRS on two symbols are subcarriers 1, 3, 5, 7, 9, and 11. As another example, taking a DMRS with symbol 1 as an example, for PDSCH mapping type B, when the CDM group number is 0, 1, or 2, the pattern of subcarriers occupied by the DMRS on one symbol can be shown in Figure 5c. From Figure 5c, it can be seen that when the CDM group number is 0, the subcarriers occupied by the DMRS on one symbol are subcarriers 0, 1, 6, and 7. When the CDM group number is 1, the subcarriers occupied by the DMRS on one symbol are subcarriers 2, 3, 8, and 9. When the CDM group number is 2, the subcarriers occupied by the DMRS on one symbol are subcarriers 4, 5, 10, and 11. As yet another example, taking a DMRS with symbol 2 as an example, for PDSCH mapping type B, when the CDM group number is 0, 1, or 2, the pattern of subcarriers occupied by the DMRS on two consecutive symbols can be shown in Figure 5d. As can be seen from Figure 5d, when the CDM group number is 0, the DMRS occupies subcarriers 0, 1, 6, and 7 on the two symbols. When the CDM group number is 1, the DMRS occupies subcarriers 2, 3, 8, and 9 on the two symbols. When the CDM group number is 2, the DMRS occupies subcarriers 4, 5, 10, and 11 on the two symbols.

[0178] 10. CRS. In LTE, CRS is used by terminal devices for channel estimation and downlink channel quality measurements, such as reference signal receiving power (RSRP) measurement. After receiving the CRS, the terminal device can perform channel estimation based on the CRS and demodulate the control channel or data channel based on the channel estimation result, thereby enabling the terminal device to obtain control information transmitted in the physical downlink control channel (PDCCH) or data in the PDSCH. For example, network devices can send CRS to terminal devices through one or more antenna ports to improve the accuracy of channel estimation. Different numbers of antenna ports correspond to different CRS patterns. For example, when the number of antenna ports is 1, the CRS pattern can be shown in Figure 6a; when the number of antenna ports is 2, the CRS pattern can be shown in Figure 6b; and when the number of antenna ports is 4, the CRS pattern can be shown in Figure 6c. The RE used to transmit the CRS can be seen in the slashed filled area.

[0179] Furthermore, the actual REs occupied by the CRS are also related to the CRS shift value. The magnitude of the shift value is equal to the result of the carrier's physical cell identifier (ID) modulo 6. The CRS shift value represents the cyclic shift of the CRS resources in the frequency domain. Taking a single antenna port as an example, when the CRS shift value is 0, the actual REs occupied by the CRS can be seen in the diagonally filled area shown in Figure 3a. For example, the CRS actually occupies the 1st and 7th REs in the first symbol (i.e., symbol 0). Taking a single antenna port as an example, when the CRS shift value is 1, after a cyclic shift of 1 subcarrier, the actual REs occupied by the CRS in the first symbol are the 2nd and 8th REs, respectively. The actual REs occupied by the CRS when the number of antenna ports is 2 or 4 can also be obtained based on the pattern and shift value shown in Figure 3, and will not be elaborated further here.

[0180] However, since the patterns of DMRS and CRS are usually fixed, when NR and LTE share spectrum resources, if the time-domain resources occupied by DMRS conflict with those occupied by CRS, mutual interference between DMRS and CRS can easily occur. This affects both LTE terminal equipment receiving CRS for channel estimation or channel quality measurements such as RSRP and NR terminal equipment receiving DMRS for channel estimation. Furthermore, it should be noted that when NR and LTE share spectrum resources, they are time-aligned in the time domain. For example, the start time of time slot j in NR is the same as the start time of subframe i in LTE. Here, i and j can be the same or different. For instance, subframe i is shown in Figure 2A, with a start time of T1, and time slot j is shown in Figure 3, with a start time of T2. Since T1 and T2 are the same, NR and LTE are time-aligned in the time domain.

[0181] In view of this, this application provides a communication method that enables network devices to reduce the possibility of overlap between the time domain resources occupied by DMRS and the time domain resources occupied by CRS by instructing terminal devices on the appropriate time domain location of DMRS on PDSCH, thereby helping to reduce mutual interference between DMRS and CRS and improve communication quality.

[0182] The embodiments of this application can be applied to NR communication systems, as well as other communication systems, such as future mobile communication systems (e.g., 6G communication systems). For example, as shown in Figure 7, it is a schematic diagram of the network architecture of a communication system according to an embodiment of this application, including network devices and terminal devices.

[0183] It should be noted that in this application embodiment, network devices and terminal devices can communicate using licensed spectrum, unlicensed spectrum, or both simultaneously; there is no limitation on this. Communication between network devices and terminal devices, as well as between terminal devices, can be achieved using spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or simultaneously using both. In other words, this application is applicable to both low-frequency scenarios (e.g., sub-6 GHz) and high-frequency scenarios (above 6 GHz).

[0184] It should be understood that the network architecture of the communication system shown in Figure 7 is merely an example and does not constitute a limitation on the network architecture of the communication system in the embodiments of this application. The embodiments of this application do not limit the number of network devices or the number of terminal devices in the communication system. For example, when the communication system in the embodiments of this application includes multiple network devices, multi-point cooperative communication can be performed between the network devices. For instance, the communication system includes multiple macro base stations and multiple micro base stations, wherein multi-point cooperative communication can be performed between macro base stations, between micro base stations, and between macro base stations and micro base stations.

[0185] Taking the network architecture of the communication system shown in Figure 7 as an example, the communication method of this application embodiment will be described in detail.

[0186] As shown in Figure 8, this is a schematic diagram of a communication method provided in an embodiment of this application, which specifically includes the following steps.

[0187] 801. The network device sends a first indication message to the terminal device. The first indication message is used to indicate the time-domain position of the DMRS set on the PDSCH. The DMRS set includes N DMRSs.

[0188] Among the M candidate PDSCHs, the number of candidate PDSCHs that meet the first condition is greater than or equal to the first threshold. The first condition is that the temporal domain position of the candidate DMRS set obtained based on the first indication information on the candidate PDSCH does not coincide with the temporal domain position of the CRS set on the candidate PDSCH. M and N are positive integers greater than or equal to 2. The first threshold can be set according to the actual situation, for example, the first threshold can be set to 1 or 2.

[0189] For example, the first instruction information can be carried in higher-level signaling, such as radio resource control (RRC) signaling, and sent by the network device to the terminal device, or it can be carried in other messages (such as custom messages) and sent by the network device to the terminal device; there is no limitation on this.

[0190] 802. The network device sends a second indication information to the terminal device. The second indication information is used to indicate the first PDSCH. The first PDSCH is a candidate PDSCH that meets the first condition among M candidate PDSCHs.

[0191] The second indication information can be carried in DCI or other messages (such as custom messages) and sent by the network device to the terminal device. Furthermore, the second indication information can also be understood as scheduling information, used to schedule data communication by the terminal device on the first PDSCH.

[0192] 803. The terminal device receives the first instruction information and the second instruction information, and based on the first instruction information and the second instruction information, receives data sent by the network device on the first PDSCH.

[0193] In some embodiments, among the M candidate PDSCHs, the number of candidate PDSCHs that meet the second condition is less than or equal to the second threshold; the second condition is: on the candidate PDSCH, the temporal position of the candidate DMRS set obtained based on the first indication information overlaps with the temporal position of the CRS set on the candidate PDSCH.

[0194] The embodiments of this application will be described in detail below using the scenario of LTE and NR sharing spectrum resources as an example.

[0195] In scenarios where LTE and NR share spectrum resources, the DMRS set is used by terminal devices in NR to perform downlink channel estimation, while the CRS set is used by terminal devices in LTE to perform downlink channel estimation or channel quality measurement.

[0196] Scene 1:

[0197] Taking a DMRS set and a CRS set as examples, where the frame structure parameter is a 15kHz subcarrier spacing, it should be noted that a 15kHz subcarrier spacing in the DMRS set can be understood as the 15kHz subcarrier spacing used in NR, and a 15kHz subcarrier spacing in the CRS set can be understood as the 15kHz subcarrier spacing used in LTE.

[0198] Taking subframe i as shown in Figure 2A in LTE as an example, the temporal position of each CRS in the CRS set on subframe i can be shown as A in Figure 9. It can be understood that when the temporal position of each CRS in the CRS set on subframe i can be shown as A in Figure 9, the CRS pattern is the CRS pattern shown in a in Figure 6 when antenna port 1 is 1, or the CRS pattern is the CRS pattern shown in b in Figure 6 when antenna port 2 is 2. Referring to Figure 2A, subframe i includes 14 symbols, from symbol 0 to symbol 13, and the start time of subframe i is T1. Taking PDSCH scheduling based on type B on time slot j in NR as an example, time slot j, as shown in Figure 3, includes 14 symbols, from symbol 0 to symbol 13, and the start time of time slot j is T2, with T1 and T2 being the same time.

[0199] In one implementation, N is set to 2, and the DMRS set includes a first DMRS and a second DMRS. The first DMRS and the second DMRS are 1-symbol DMRS. The time-domain position of the first DMRS on the PDSCH is the starting symbol l0 of the PDSCH. Then, the time-domain position of the second DMRS on the PDSCH is the symbol (l0 + Δl) of the PDSCH. Δl can be understood as the number of symbols that differ between the starting symbols of the first DMRS and the starting symbols of the second DMRS. The starting symbol of the first DMRS can be understood as the time-domain position of the first DMRS on the PDSCH, and the starting symbol of the second DMRS can be understood as the time-domain position of the second DMRS on the PDSCH.

[0200] As shown in Figure 10A, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 2 and the starting symbol of the PDSCH not coinciding with the temporal position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. For example, taking candidate PDSCH1 as an example, if the temporal position of the first DMRS on candidate PDSCH1 is symbol 1, then the starting symbol of the first DMRS is also symbol 1. If the temporal position of the second DMRS on candidate PDSCH2 is symbol 3, then the starting symbol of the second DMRS is symbol 3. From Figure 10A, it can be seen that for a 9-symbol PDSCH, when Δl = 2, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH1 and candidate PDSCH3. When the starting symbol of the PDSCH does not coincide with the temporal position of the CRS set, the number of candidate PDSCHs satisfying the second condition is also 2, namely candidate PDSCH2 and candidate PDSCH4.

[0201] As shown in Figure 10B, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 3 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. Figure 10B shows that for the 9-symbol PDSCH, when Δl = 3, the number of candidate PDSCHs satisfying the first condition is 3, namely candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of candidate PDSCHs satisfying the second condition is 1, namely candidate PDSCH1.

[0202] As shown in Figure 10C, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 4 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. Figure 10C shows that for the 9-symbol PDSCH, when Δl = 4, the number of candidate PDSCHs satisfying the first condition is 3, namely candidate PDSCH1, candidate PDSCH2, and candidate PDSCH4. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of candidate PDSCHs satisfying the second condition is 1, namely candidate PDSCH3.

[0203] As shown in Figure 10D, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 5 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. Figure 10D shows that for the 9-symbol PDSCH, when Δl = 5, the number of candidate PDSCHs satisfying the first condition is 3, namely candidate PDSCH1, PDSCH3, and candidate PDSCH4. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of candidate PDSCHs satisfying the second condition is 1, namely candidate PDSCH2.

[0204] As shown in Figure 10E, for scheduling a 9-symbol PDSCH in time slot j, with Δl = 6 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. Figure 10E shows that for the 9-symbol PDSCH, when Δl = 6, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH2 and candidate PDSCH3. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of candidate PDSCHs satisfying the second condition is also 2, namely candidate PDSCH1 and candidate PDSCH4.

[0205] As shown in Figure 10F, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 7 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. Figure 10F shows that for the 9-symbol PDSCH, when Δl = 7, the number of candidate PDSCHs satisfying the first condition is 4, namely candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of candidate PDSCHs satisfying the second condition is 0.

[0206] As shown in Figure 10G, for scheduling a 9-symbol PDSCH in time slot j, with Δl = 8 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. Figure 10G shows that for the 9-symbol PDSCH, when Δl = 8, the number of candidate PDSCHs satisfying the first condition is 3, namely candidate PDSCH1, candidate PDSCH2, and candidate PDSCH4. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of candidate PDSCHs satisfying the second condition is 1, namely candidate PDSCH3.

[0207] As shown in Figure 10H, when scheduling a 10-symbol PDSCH in time slot j, with Δl = 9 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 10-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, and candidate PDSCH3. Figure 10H shows that for the 10-symbol PDSCH, when Δl = 9, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH1 and candidate PDSCH3. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 1, namely candidate PDSCH2.

[0208] Scene 2:

[0209] Taking the DMRS set and the CRS set as examples, the frame structure parameters are 15kHz subcarrier spacing.

[0210] Taking subframe i as shown in Figure 2A in LTE as an example, the temporal position of each CRS in the CRS set on subframe i can be seen as shown in Figure 9A. It can be understood that when the temporal position of each CRS in the CRS set on subframe i can be seen as shown in Figure 9A, the CRS pattern is the CRS pattern shown in Figure 6C when the antenna port is 4. Referring to Figure 2A, subframe i includes 14 symbols, from symbol 0 to symbol 13, and the start time of subframe i is T1. Taking PDSCH scheduling based on type B on time slot j in NR as an example, time slot j, as shown in Figure 3, includes 14 symbols, from symbol 0 to symbol 13, and the start time of time slot j is T2, with T1 and T2 being the same time.

[0211] In one implementation, when N is 2, the DMRS set includes a first DMRS and a second DMRS. The first and second DMRS are 1-symbol DMRS. The time-domain position of the first DMRS on the PDSCH is the start symbol l0 of the PDSCH. Then, the time-domain position of the second DMRS on the PDSCH is the symbol (l0 + Δl), where Δl can be understood as the symbol interval between the start symbols of the first and second DMRS. The start symbol of the first DMRS can be understood as the time-domain position of the first DMRS on the PDSCH, and the start symbol of the second DMRS can be understood as the time-domain position of the second DMRS on the PDSCH.

[0212] As shown in Figure 11A, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 2 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, and candidate PDSCH3, respectively. Figure 11A shows that for the 9-symbol PDSCH, when Δl = 2, the number of candidate PDSCHs satisfying the first condition is 1, which is candidate PDSCH2. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is also 2, namely candidate PDSCH1 and candidate PDSCH3.

[0213] As shown in Figure 11B, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 3 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, and candidate PDSCH3. Figure 11B shows that for the 9-symbol PDSCH, when Δl = 3, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH1 and candidate PDSCH2. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 1, namely candidate PDSCH3.

[0214] As shown in Figure 11C, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 4 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, and candidate PDSCH3. Figure 11C shows that for the 9-symbol PDSCH, when Δl = 4, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH1 and candidate PDSCH3. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 1, namely candidate PDSCH2.

[0215] As shown in Figure 11D, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 5 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, and candidate PDSCH3. Figure 11D shows that for the 9-symbol PDSCH, when Δl = 5, the number of candidate PDSCHs satisfying the first condition is 1, which is candidate PDSCH3. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 2, which are candidate PDSCH1 and candidate PDSCH2.

[0216] As shown in Figure 11E, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 6 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, and candidate PDSCH3. Figure 11E shows that for the 9-symbol PDSCH, when Δl = 6, the number of candidate PDSCHs satisfying the first condition is 1, which is candidate PDSCH2. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 2, which are candidate PDSCH1 and candidate PDSCH3.

[0217] As shown in Figure 11F, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 7 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, and candidate PDSCH3. Figure 11F shows that for the 9-symbol PDSCH, when Δl = 7, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH1 and candidate PDSCH3. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 1, namely candidate PDSCH2.

[0218] As shown in Figure 11G, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 8 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, and candidate PDSCH3. Figure 11G shows that for the 9-symbol PDSCH, when Δl = 8, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH1 and candidate PDSCH3. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 1, namely candidate PDSCH2.

[0219] As shown in Figure 11H, when scheduling a 10-symbol PDSCH in time slot j, under the condition that Δl = 9 and the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the candidate PDSCHs for the 10-symbol PDSCH are candidate PDSCH1 and candidate PDSCH2, respectively. Figure 11H shows that for a 10-symbol PDSCH, when Δl = 9, the number of candidate PDSCHs satisfying the first condition is 1, which is candidate PDSCH1. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of candidate PDSCHs satisfying the second condition is 1, which is candidate PDSCH2.

[0220] Combining Figures 10A to 10H and Figures 11A to 11H, with N set to 2 and the frame structure parameter of the DMRS set being 15kHz subcarrier spacing, the number of candidate PDSCHs meeting the first condition is statistically shown in Table 1 when the duration L of the PDSCH is 9 and 10, under different Δl conditions.

[0221] Table 1

[0222]

[0223] Based on Table 1, the value of the first threshold can be set according to the actual situation. For example, if the first threshold is 2, for a 15kHz subcarrier spacing, when Δl = 7, and the PDSCH duration L = 9 or 10 symbols and the CRS antenna ports are 2 or 4, the number of candidate PDSCHs that meet the first condition is greater than or equal to the first threshold. Therefore, the time-domain position of the DMRS set on the PDSCH can be defined by the communication protocol as the start symbol l0 of the PDSCH and the symbol (l0+7) of the PDSCH. For example, the time-domain position of the DMRS set on the PDSCH can be defined in the communication protocol as the start symbol l0 of the PDSCH and the symbol (l0+7) of the PDSCH:

[0224] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl, Δl is 7; or...

[0225] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l, and △l is 7.

[0226] With a subcarrier spacing of 15 kHz, the time-domain position of the DMRS set indicated by the first indication information on the PDSCH is the start symbol l0 and the symbol (l0+7) of the PDSCH. In this case, the first PDSCH indicated by the second indication information, the start symbol l0 and the symbol (l0+7) of the first PDSCH are the time-domain positions of the DMRS on the PDSCH, respectively.

[0227] For example, if the first threshold is set to 1, for a 15kHz subcarrier spacing, when Δl = 2, 3, 4, 6, 7, and 8, and the PDSCH duration L = 9 or 10 and the CRS antenna port is 2 or 4, the number of candidate PDSCHs meeting the first condition is greater than or equal to the first threshold. Taking Δl = 8 as an example, the time-domain position of the DMRS set on the PDSCH can be defined by the communication protocol as the start symbol l0 of the PDSCH and the symbol (l0+8) of the PDSCH. Taking Δl = 7 as an example, the time-domain position of the DMRS set on the PDSCH can be defined by the communication protocol as the start symbol l0 of the PDSCH and the symbol (l0+6), etc.

[0228] Below, we take the example of defining the time-domain position of the DMRS set on the PDSCH as the start symbol l0 and the symbol (l0+8) of the PDSCH through a communication protocol. For example, the time-domain position of the DMRS set on the PDSCH as the start symbol l0 and the symbol (l0+8) of the PDSCH can be defined in the communication protocol as follows:

[0229] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl, Δl is 8; or...

[0230] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l, and △l is 8.

[0231] Furthermore, in other embodiments, for a PDSCH duration L = 10 symbols, if the first threshold is 1, for a 15kHz subcarrier spacing, when Δl = 9, and the CRS antenna ports are 2 or 4, the number of candidate PDSCHs that meet the first condition is greater than or equal to the first threshold. Therefore, the time domain position of the DMRS set on the PDSCH can be defined by the communication protocol as the starting symbol l0 of the PDSCH and the symbol (l0+9) of the PDSCH.

[0232] For example, the time-domain position of the DMRS set on the PDSCH can be defined in the communication protocol as the start symbol l0 of the PDSCH and the symbol (l0+9) of the PDSCH:

[0233] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l, and △l is 9.

[0234] In other embodiments, a second threshold can be set to further limit the candidate PDSCH, and the temporal position of the DMRS set on the PDSCH can be defined based on the value of Δl when the first and second conditions are satisfied simultaneously.

[0235] When N is 3, the DMRS set includes a first DMRS, a second DMRS, and a third DMRS. For a 15kHz subcarrier spacing corresponding to the DMRS set, the time-domain position of the first DMRS on the PDSCH is the start symbol l0 of the PDSCH; the time-domain position of the second DMRS on the PDSCH can be the symbol (l0 + Δl1); and the time-domain position of the third DMRS on the PDSCH can be the symbol (l0 + Δl2). Here, Δl1 is the number of symbols differing between the start symbols of the first and second DMRS, and Δl2 is the number of symbols differing between the start symbols of the first and third DMRS.

[0236] For example, the value of Δl1 can be any of the values ​​in Table 1 where Δl is 4, 5, or 6, and the number of candidate PDSCHs meeting the first condition is greater than or equal to the first threshold. For instance, if the first threshold is 1 and Δl is 4 or 6, the number of candidate PDSCHs meeting the first condition is greater than or equal to 1. Therefore, the temporal position of the second DMRS on the PDSCH can be the sign of the PDSCH (l0+4) or the sign of the PDSCH (l0+6). The value of Δl2 can be any of the values ​​in Table 1 where Δl is 7, 8, or 9, and the number of candidate PDSCHs meeting the first condition is greater than or equal to the first threshold. For instance, if the first threshold is 2 and Δl is 7, the number of candidate PDSCHs meeting the first condition is greater than or equal to 2. Therefore, the temporal position of the third DMRS on the PDSCH can be the sign of the PDSCH (l0+7). For example, when the first threshold is 1 and Δl is 7 or 8, the number of candidate PDSCHs that meet the first condition is greater than or equal to 1. Therefore, the time domain position of the third DMRS on the PDSCH can be the symbol (l0+7) or the symbol (l0+8) of the PDSCH.

[0237] For another example, the value of Δl1 can be any of the Δl values ​​in Table 1 where Δl is 2 or 3, and the number of candidate PDSCHs meeting the first condition is greater than or equal to the value of the first threshold. For instance, if the first threshold is 1 and Δl is 2 or 3, the number of candidate PDSCHs meeting the first condition is greater than or equal to 1. Therefore, the temporal position of the second DMRS on the PDSCH can be the sign (l0+2) or the sign (l0+3) of the PDSCH. As another example, if the first threshold is 2 and Δl is 3, the number of candidate PDSCHs meeting the first condition is greater than or equal to 2. Therefore, the temporal position of the second DMRS on the PDSCH can be the sign (l0+3) of the PDSCH. The value of Δl2 can be any of the values ​​of Δl in Table 1 where Δl is 7, 8, or 9, and the number of candidate PDSCHs meeting the first condition is greater than or equal to the value of Δl in the first threshold. For example, if the first threshold is 2 and Δl is 7, the number of candidate PDSCHs meeting the first condition is greater than or equal to 2. Therefore, the temporal position of the third DMRS on the PDSCH can be the sign (l0+7) of the PDSCH. Alternatively, if the first threshold is 1 and Δl is 7 or 8, the number of candidate PDSCHs meeting the first condition is greater than or equal to 1. Therefore, the temporal position of the third DMRS on the PDSCH can be the sign (l0+7) or the sign (l0+8) of the PDSCH. Alternatively, the value of Δl2 can be any of the Δl values ​​in Table 1 where the number of candidate PDSCHs meeting the first condition is greater than or equal to the value of the first threshold. For example, when the first threshold is 1 and Δl is 4 or 6, the number of candidate PDSCHs meeting the first condition is greater than or equal to 1. Therefore, the temporal position of the third DMRS on the PDSCH can be the sign (l0+4) or the sign (l0+6) of the PDSCH.

[0238] Furthermore, considering that the symbol interval between different DMRS in the time domain on the PDSCH is small, which may affect the reliability of channel estimation, in some embodiments, when N is 4, the time domain position of the first DMRS on the PDSCH can be defined by the communication protocol as the starting symbol l0 of the PDSCH, the time domain position of the second DMRS on the PDSCH as symbol (l0+2) or symbol (l0+3) of the PDSCH, and the time domain position of the third DMRS on the PDSCH as symbol (l0+7) or symbol (l0+8) of the PDSCH.

[0239] Taking the time-domain position of the first DMRS on the PDSCH as the start symbol l0 of the PDSCH, the time-domain position of the second DMRS on the PDSCH as the symbol (l0 + Δl1), and the time-domain position of the third DMRS on the PDSCH as the symbol (l0 + Δl2), as an example, where Δl1 = 2 or 3, and Δl2 = 7 or 8. For example, the time-domain position of the DMRS set on the PDSCH can be defined in the communication protocol in the following way:

[0240] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, Δl2 is 7; or...

[0241] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, Δl2 is 7; or...

[0242] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, Δl2 is 8; or...

[0243] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, Δl2 is 8; or...

[0244] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, Δl2 is 7; or...

[0245] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, Δl2 is 7; or...

[0246] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, Δl2 is 8; or...

[0247] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, △l1 is 3, △l2 is 8.

[0248] When N is 4, the DMRS set includes a first DMRS, a second DMRS, a third DMRS, and a fourth DMRS. For a 15kHz subcarrier spacing corresponding to the DMRS set, the time-domain position of the first DMRS on the PDSCH is the start symbol l0 of the PDSCH; the time-domain position of the second DMRS on the PDSCH can be the symbol (l0 + Δl1); the time-domain position of the third DMRS on the PDSCH can be the symbol (l0 + Δl2); and the time-domain position of the fourth DMRS on the PDSCH can be the symbol (l0 + Δl3). Here, Δl1 is the number of symbols differing between the start symbols of the first and second DMRS, Δl2 is the number of symbols differing between the start symbols of the first and third DMRS, and Δl3 is the number of symbols differing between the start symbols of the first and fourth DMRS.

[0249] For example, the value of Δl1 can be any Δl value in Table 1 where Δl is 2 or 3, and the number of candidate PDSCHs meeting the first condition is greater than or equal to the value of the first threshold. For instance, if the first threshold is 1 and Δl is 2 or 3, the number of candidate PDSCHs meeting the first condition is greater than or equal to 1. Therefore, the temporal position of the second DMRS on the PDSCH can be the sign (l0+2) or the sign (l0+3) of the PDSCH. As another example, if the first threshold is 2 and Δl is 3, the number of candidate PDSCHs meeting the first condition is greater than or equal to 2. Therefore, the temporal position of the second DMRS on the PDSCH can be the sign (l0+3) of the PDSCH. The value of Δl2 can be any of the values ​​in Table 1 where Δl is 4, 5, or 6, and the number of candidate PDSCHs meeting the first condition is greater than or equal to the first threshold. For example, if the first threshold is 1 and Δl is 4 or 6, the number of candidate PDSCHs meeting the first condition is greater than or equal to 1. Therefore, the temporal position of the third DMRS on the PDSCH can be the sign of the PDSCH (l0+4) or the sign of the PDSCH (l0+6). The value of Δl3 can be any of the values ​​in Table 1 where Δl is 7, 8, or 9, and the number of candidate PDSCHs meeting the first condition is greater than or equal to the first threshold. For example, if the first threshold is 2 and Δl is 7, the number of candidate PDSCHs meeting the first condition is greater than or equal to 2. Therefore, the temporal position of the fourth DMRS on the PDSCH can be the sign of the PDSCH (l0+7). For example, when the first threshold is 1 and Δl is 7 or 8, the number of candidate PDSCHs that meet the first condition is greater than or equal to 1. Therefore, the time domain position of the fourth DMRS on the PDSCH can be the symbol (l0+7) or the symbol (l0+8) of the PDSCH.

[0250] Furthermore, considering that the small symbol spacing between the time-domain positions of different DMRS on the PDSCH may affect the reliability of channel estimation, in some embodiments, when N is 3, the time-domain position of the first DMRS on the PDSCH can be defined by the communication protocol as the start symbol l0 of the PDSCH, the time-domain position of the second DMRS on the PDSCH as the symbol (l0+3) of the PDSCH, the time-domain position of the third DMRS on the PDSCH as the symbol (l0+6) of the PDSCH, and the time-domain position of the fourth DMRS on the PDSCH as the symbol (l0+8) of the PDSCH; or, the time-domain position of the first DMRS on the PDSCH is the start symbol l0 of the PDSCH, the time-domain position of the second DMRS on the PDSCH is the symbol (l0+2) of the PDSCH, the time-domain position of the third DMRS on the PDSCH is the symbol (l0+4) of the PDSCH, and the time-domain position of the fourth DMRS on the PDSCH is the symbol (l0+7) of the PDSCH.

[0251] Taking the time-domain position of the first DMRS on the PDSCH as the start symbol l0 of the PDSCH, the time-domain position of the second DMRS on the PDSCH as the symbol (l0 + Δl1), the time-domain position of the third DMRS on the PDSCH as the symbol (l0 + Δl2), and the time-domain position of the fourth DMRS on the PDSCH as the symbol (l0 + Δl3) of the PDSCH as an example, where Δl1 = 2, Δl2 = 4, Δl3 = 7; or, Δl1 = 3, Δl2 = 6, Δl3 = 8. For example, the time-domain position of the DMRS set on the PDSCH can be defined in the communication protocol in the following way:

[0252] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, △l3 is 8; or...

[0253] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, △l3 is 8; or...

[0254] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 2, △l2 is 4, △l3 is 7; or...

[0255] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 2, △l2 is 4, and △l3 is 7.

[0256] Scene 3:

[0257] Taking a DMRS set with a 30kHz subcarrier spacing as an example and a CRS set with a 15kHz subcarrier spacing as an example, it should be noted that a 30kHz subcarrier spacing for the DMRS set can be understood as a 30kHz subcarrier spacing used in NR, and a 30kHz subcarrier spacing for the CRS set can be understood as a 15kHz subcarrier spacing used in LTE.

[0258] Taking subframe i as shown in Figure 2A in LTE as an example, the temporal position of each CRS in the CRS set on subframe i can be shown as A in Figure 9. It can be understood that when the temporal position of each CRS in the CRS set on subframe i can be shown as A in Figure 9, the CRS pattern is the CRS pattern shown in a in Figure 6 when antenna port 1 is 1, or the CRS pattern is the CRS pattern shown in b in Figure 6 when antenna port 2 is 2. Referring to Figure 2A, subframe i includes 14 symbols, from symbol 0 to symbol 13, and the start time of subframe i is T1. Taking PDSCH scheduling based on type B on time slot j in NR as an example, time slot j, as shown in Figure 3, includes 14 symbols, from symbol 0 to symbol 13, and the start time of time slot j is T2, where T1 and T2 are the same time.

[0259] It should be noted that, with NR using a 30kHz subcarrier spacing and LTE using a 15kHz subcarrier spacing, NR and LTE are time-aligned. This can be understood as the starting position of time slot j in NR being aligned with the starting position of time slot i in subframe i. For example, taking subframe i as shown in Figure 2A, symbols 0 to 6 in subframe i are time slot 0, and symbols 7 to 13 in subframe i are time slot 1. Taking time slot j in NR as an example, as shown in Figure 3, the starting position of time slot j is aligned with the starting position of time slot 0, or the starting position of time slot j is aligned with the starting position of time slot 1. Both can be understood as NR and LTE being time-aligned. For example, the starting position of time slot j is time T2 as shown in Figure 3; the starting position of time slot 0 is time T1 as shown in Figure 2A. The following explanation uses the example of T1 and T2 being the same time.

[0260] In one implementation, N is set to 2, and the DMRS set includes a first DMRS and a second DMRS. The first and second DMRS are 1-symbol DMRS. The time-domain position of the first DMRS on the PDSCH is the start symbol l0 of the PDSCH. Then, the time-domain position of the second DMRS on the PDSCH is the symbol (l0 + Δl), where Δl can be understood as the symbol interval between the start symbols of the first and second DMRS. The start symbol of the first DMRS can be understood as the time-domain position of the first DMRS on the PDSCH, and the start symbol of the second DMRS can be understood as the time-domain position of the second DMRS on the PDSCH.

[0261] As shown in Figure 12A, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 2 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. Figure 12A shows that for the 9-symbol PDSCH, when Δl = 2, the number of candidate PDSCHs satisfying the first condition is 4, namely candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is also 0.

[0262] As shown in Figure 12B, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 3 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. Figure 12B shows that for a 9-symbol PDSCH, when Δl = 3, the number of candidate PDSCHs satisfying the first condition is 3, namely candidate PDSCH1, candidate PDSCH2, and candidate PDSCH3. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 1, which is candidate PDSCH4.

[0263] As shown in Figure 12C, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 4 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. Figure 12C shows that for the 9-symbol PDSCH, when Δl = 4, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH1 and candidate PDSCH2. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is also 2, namely candidate PDSCH3 and candidate PDSCH4.

[0264] As shown in Figure 12D, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 5 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. Figure 12D shows that for the 9-symbol PDSCH, when Δl = 5, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH1 and candidate PDSCH4. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is also 2, namely candidate PDSCH2 and candidate PDSCH3.

[0265] As shown in Figure 12E, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 6 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. Figure 12E shows that for the 9-symbol PDSCH, when Δl = 6, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH1 and candidate PDSCH2. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is also 2, namely candidate PDSCH3 and candidate PDSCH4.

[0266] As shown in Figure 12F, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 7 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. Figure 12F shows that for the 9-symbol PDSCH, when Δl = 7, the number of candidate PDSCHs satisfying the first condition is 3, namely candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 1, which is candidate PDSCH1.

[0267] As shown in Figure 12G, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 8 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. Figure 12G shows that for the 9-symbol PDSCH, when Δl = 8, the number of candidate PDSCHs satisfying the first condition is 4, namely candidate PDSCH1, candidate PDSCH2, candidate PDSCH3, and candidate PDSCH4. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 0.

[0268] As shown in Figure 12H, when scheduling a 10-symbol PDSCH in time slot j, under the condition that Δl = 9 and the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the candidate PDSCHs for the 10-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, and candidate PDSCH3, respectively. Figure 10H shows that for a 10-symbol PDSCH, when Δl = 9, the number of candidate PDSCHs satisfying the first condition is 3, namely candidate PDSCH1, candidate PDSCH2, and candidate PDSCH3. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 0.

[0269] Scene 4:

[0270] Taking the DMRS set with a subcarrier spacing of 30kHz and the CRS set with a subcarrier spacing of 15kHz as an example.

[0271] Taking subframe i as shown in Figure 2A in LTE as an example, the temporal position of each CRS in the CRS set on subframe i can be seen as shown in Figure 9A. It can be understood that when the temporal position of each CRS in the CRS set on subframe i can be seen as shown in Figure 9A, the CRS pattern is the CRS pattern shown in Figure 6C when the antenna port is 4. Referring to Figure 2A, subframe i includes 14 symbols, from symbol 0 to symbol 13, and the start time of subframe i is T1. Taking PDSCH scheduling based on type B on time slot j in NR as an example, time slot j, as shown in Figure 3, includes 14 symbols, from symbol 0 to symbol 13, and the start time of time slot j is T2, with T1 and T2 being the same time.

[0272] In one implementation, when N is 2, the DMRS set includes a first DMRS and a second DMRS. The first and second DMRS are 1-symbol DMRS. The time-domain position of the first DMRS on the PDSCH is the start symbol l0 of the PDSCH. Then, the time-domain position of the second DMRS on the PDSCH is the symbol (l0 + Δl), where Δl can be understood as the symbol interval between the start symbols of the first and second DMRS. The start symbol of the first DMRS can be understood as the time-domain position of the first DMRS on the PDSCH, and the start symbol of the second DMRS can be understood as the time-domain position of the second DMRS on the PDSCH.

[0273] As shown in Figure 13A, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 2 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1 and candidate PDSCH2. Figure 13A shows that for the 9-symbol PDSCH, when Δl = 2, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH1 and candidate PDSCH2. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is also 0.

[0274] As shown in Figure 13B, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 3 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1 and candidate PDSCH2, respectively. Figure 13B shows that for the 9-symbol PDSCH, when Δl = 3, the number of candidate PDSCHs satisfying the first condition is 1, which is candidate PDSCH1. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of candidate PDSCHs satisfying the second condition is 1, which is candidate PDSCH2.

[0275] As shown in Figure 13C, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 4 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1 and candidate PDSCH2. Figure 13C shows that for the 9-symbol PDSCH, when Δl = 4, the number of candidate PDSCHs satisfying the first condition is 0. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 2, namely candidate PDSCH1 and candidate PDSCH2.

[0276] As shown in Figure 13D, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 5 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1 and candidate PDSCH2, respectively. Figure 13D shows that for the 9-symbol PDSCH, when Δl = 5, the number of candidate PDSCHs satisfying the first condition is 1, which is candidate PDSCH2. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 1, which is candidate PDSCH1.

[0277] As shown in Figure 13E, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 6 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1 and candidate PDSCH2. Figure 13E shows that for the 9-symbol PDSCH, when Δl = 6, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH1 and candidate PDSCH2. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 0.

[0278] As shown in Figure 13F, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 7 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1 and candidate PDSCH2. Figure 13F shows that for the 9-symbol PDSCH, when Δl = 7, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH1 and candidate PDSCH2. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 0.

[0279] As shown in Figure 13G, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 8 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1 and candidate PDSCH2. Figure 13G shows that for the 9-symbol PDSCH, when Δl = 8, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH1 and candidate PDSCH2. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 0.

[0280] As shown in Figure 13H, when scheduling a 10-symbol PDSCH in time slot j, with Δl = 9 and the starting symbol of the PDSCH not coinciding with the time domain position of the CRS set, the candidate PDSCHs for the 10-symbol PDSCH are candidate PDSCH1. Figure 13H shows that for the 10-symbol PDSCH, when Δl = 9, the number of candidate PDSCHs satisfying the first condition is 1, which is candidate PDSCH1. When the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs satisfying the second condition is 0.

[0281] Combining Figures 12A-12H and 13A-13H, with N set to 2 and the frame structure parameter of the DMRS set being 15kHz subcarrier spacing, the number of candidate PDSCHs satisfying the first condition is statistically shown in Table 2 when the duration L of the PDSCH is 9 and 10, under different Δl conditions.

[0282] Table 2

[0283]

[0284] Based on Table 2, the value of the first threshold can be set according to the actual situation. For example, if the first threshold is 1, for a 30kHz subcarrier spacing, when Δl = 3, 7, or 8, and the PDSCH duration L = 9 or 10 symbols and the CRS antenna ports are 2 or 4, the number of candidate PDSCHs that meet the first condition is greater than or equal to the first threshold. Therefore, the time-domain position of the DMRS set on the PDSCH can be defined by the communication protocol as the starting symbol l0 of the PDSCH, and the symbols (l0+3), (l0+7), or (l0+8) of the PDSCH. For example, the time-domain position of the DMRS set on the PDSCH can be defined in the communication protocol as the starting symbol l0 of the PDSCH and the symbol (l0+8) of the PDSCH:

[0285] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl, Δl is 8; or...

[0286] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l, and △l is 8.

[0287] In the case of a 30kHz subcarrier spacing, the time-domain position of the DMRS set indicated by the first indication information on the PDSCH is the start symbol l0 of the PDSCH and the symbol (l0+8) of the PDSCH.

[0288] Furthermore, in other embodiments, for a PDSCH duration L = 10 symbols, if the first threshold is 1, for a 30kHz subcarrier spacing, when Δl = 9, and the CRS antenna ports are 2 or 4, the number of candidate PDSCHs that meet the first condition is greater than or equal to the first threshold. Therefore, the time domain position of the DMRS set on the PDSCH can be defined by the communication protocol as the starting symbol l0 of the PDSCH and the symbol (l0+9) of the PDSCH.

[0289] For example, the time-domain position of the DMRS set on the PDSCH can be defined in the communication protocol as the start symbol l0 of the PDSCH and the symbol (l0+9) of the PDSCH:

[0290] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l, and △l is 9.

[0291] In other embodiments, a second threshold can be set to further limit the candidate PDSCH, and the temporal position of the DMRS set on the PDSCH can be defined based on the value of Δl when the first and second conditions are satisfied simultaneously.

[0292] When N is 3, the DMRS set includes a first DMRS, a second DMRS, and a third DMRS. For a 30kHz subcarrier spacing corresponding to the DMRS set, the time-domain position of the first DMRS on the PDSCH is the start symbol l0 of the PDSCH; the time-domain position of the second DMRS on the PDSCH can be the symbol (l0 + Δl1); and the time-domain position of the third DMRS on the PDSCH can be the symbol (l0 + Δl2). Δl1 is the number of symbols differing between the start symbols of the first and second DMRS, and Δl2 is the number of symbols differing between the start symbols of the first and third DMRS.

[0293] For example, the value of Δl1 can be any of the values ​​in Table 2 where Δl is 4, 5, or 6, and the number of candidate PDSCHs meeting the first condition is greater than or equal to the first threshold. For instance, if the first threshold is 1 and Δl is 6, the number of candidate PDSCHs meeting the first condition is greater than or equal to 1. Therefore, the temporal position of the second DMRS on the PDSCH can be the sign of the PDSCH (l0+6). The value of Δl2 can be any of the values ​​in Table 1 where Δl is 7, 8, or 9, and the number of candidate PDSCHs meeting the first condition is greater than or equal to the first threshold. For instance, if the first threshold is 1 and Δl is 7 or 8, the number of candidate PDSCHs meeting the first condition is greater than or equal to 1. Therefore, the temporal position of the third DMRS on the PDSCH can be the sign of the PDSCH (l0+7) or the sign of the PDSCH (l0+8).

[0294] For another example, the value of Δl1 can be any of the values ​​of Δl in Table 1 where Δl is 2 or 3, and the number of candidate PDSCHs meeting the first condition is greater than or equal to the value of the first threshold. For example, if the first threshold is 1 and Δl is 2 or 3, the number of candidate PDSCHs meeting the first condition is greater than or equal to 1. Therefore, the temporal position of the second DMRS on the PDSCH can be the sign (l0+2) or the sign (l0+3) of the PDSCH. As another example, if the first threshold is 2 and Δl is 2, the number of candidate PDSCHs meeting the first condition is greater than or equal to 2. Therefore, the temporal position of the second DMRS on the PDSCH can be the sign (l0+2) of the PDSCH. The value of Δl2 can be any of the following values ​​in Table 1 where Δl is 7, 8, or 9, and the number of candidate PDSCHs meeting the first condition is greater than or equal to the first threshold. For example, if the first threshold is 1 and Δl is 7 or 8, the number of candidate PDSCHs meeting the first condition is greater than or equal to 1. Therefore, the temporal position of the third DMRS on the PDSCH can be the sign of the PDSCH (l0+7) or the sign of the PDSCH (l0+8). Alternatively, the value of Δl2 can be any of the following values ​​in Table 1 where Δl is 4, 5, or 6, and the number of candidate PDSCHs meeting the first condition is greater than or equal to the first threshold. For example, if the first threshold is 1 and Δl is 6, the number of candidate PDSCHs meeting the first condition is greater than or equal to 1. Therefore, the temporal position of the third DMRS on the PDSCH can be the sign of the PDSCH (l0+6).

[0295] Furthermore, considering that the symbol interval between different DMRS in the time domain on the PDSCH is small, which may affect the reliability of channel estimation, in some embodiments, when N is 3, the time domain position of the first DMRS on the PDSCH can be defined by the communication protocol as the starting symbol l0 of the PDSCH, the time domain position of the second DMRS on the PDSCH as symbol (l0+2) or symbol (l0+3) of the PDSCH, and the time domain position of the third DMRS on the PDSCH as symbol (l0+7) or symbol (l0+8) of the PDSCH.

[0296] Taking the time-domain position of the first DMRS on the PDSCH as the start symbol l0 of the PDSCH, the time-domain position of the second DMRS on the PDSCH as the symbol (l0 + Δl1) of the PDSCH, and the time-domain position of the third DMRS on the PDSCH as the symbol (l0 + Δl2) of the PDSCH, where Δl1 = 2 or 3, and Δl2 = 7 or 8, the time-domain position of the DMRS set on the PDSCH can be defined in the communication protocol in the following way:

[0297] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, Δl2 is 7; or...

[0298] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, Δl2 is 7; or...

[0299] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, Δl2 is 8; or...

[0300] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, Δl2 is 8; or...

[0301] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, Δl2 is 7; or...

[0302] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, Δl2 is 7; or...

[0303] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, Δl2 is 8; or...

[0304] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, △l1 is 3, △l2 is 8.

[0305] When N is 4, the DMRS set includes a first DMRS, a second DMRS, a third DMRS, and a fourth DMRS. For a 30kHz subcarrier spacing corresponding to the DMRS set, the time-domain position of the first DMRS on the PDSCH is the start symbol l0 of the PDSCH; the time-domain position of the second DMRS on the PDSCH can be the symbol (l0 + Δl1); the time-domain position of the third DMRS on the PDSCH can be the symbol (l0 + Δl2); and the time-domain position of the fourth DMRS on the PDSCH can be the symbol (l0 + Δl3). Here, Δl1 is the number of symbols differing between the start symbols of the first and second DMRS; Δl2 is the number of symbols differing between the start symbols of the first and third DMRS; and Δl3 is the number of symbols differing between the start symbols of the first and fourth DMRS.

[0306] For example, the value of Δl1 can be any Δl value in Table 1 where Δl is 2 or 3, and the number of candidate PDSCHs meeting the first condition is greater than or equal to the value of the first threshold. For instance, if the first threshold is 1 and Δl is 2 or 3, the number of candidate PDSCHs meeting the first condition is greater than or equal to 1. Therefore, the temporal position of the second DMRS on the PDSCH can be the sign (l0+2) or the sign (l0+3) of the PDSCH. As another example, if the first threshold is 2 and Δl is 2, the number of candidate PDSCHs meeting the first condition is greater than or equal to 2. Therefore, the temporal position of the second DMRS on the PDSCH can be the sign (l0+2) of the PDSCH. The value of Δl2 can be any of the following values ​​in Table 1: Δl values ​​4, 5, and 6, where the number of candidate PDSCHs meeting the first condition is greater than or equal to the value of the first threshold Δl. For example, if the first threshold is 1 and Δl is 6, the number of candidate PDSCHs meeting the first condition is greater than or equal to 1. Therefore, the temporal position of the third DMRS on the PDSCH can be the sign of the PDSCH (l0+6). The value of Δl3 can be any of the following values ​​in Table 1: Δl values ​​7, 8, and 9, where the number of candidate PDSCHs meeting the first condition is greater than or equal to the value of the first threshold Δl. For example, if the first threshold is 1 and Δl is 7 or 8, the number of candidate PDSCHs meeting the first condition is greater than or equal to 2. Therefore, the temporal position of the fourth DMRS on the PDSCH can be the sign of the PDSCH (l0+7) or the sign of the PDSCH (l0+8).

[0307] Furthermore, considering that the symbol interval between different DMRS in the time domain on the PDSCH is small, which may affect the reliability of channel estimation, in some embodiments, when N is 4, the time domain position of the first DMRS on the PDSCH can be defined by the communication protocol as the starting symbol l0 of the PDSCH, the time domain position of the second DMRS on the PDSCH as the symbol (l0+3) of the PDSCH, the time domain position of the third DMRS on the PDSCH as the symbol (l0+6) of the PDSCH, and the time domain position of the fourth DMRS on the PDSCH as the symbol (l0+8) of the PDSCH.

[0308] Taking the time-domain position of the first DMRS on the PDSCH as the start symbol l0 of the PDSCH, the time-domain position of the second DMRS on the PDSCH as the symbol (l0 + Δl1), the time-domain position of the third DMRS on the PDSCH as the symbol (l0 + Δl2), and the time-domain position of the fourth DMRS on the PDSCH as the symbol (l0 + Δl3), as an example, where Δl1 = 3, Δl2 = 6, and Δl3 = 8. For example, the time-domain position of the DMRS set on the PDSCH can be defined in the communication protocol in the following way:

[0309] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, △l3 is 8; or...

[0310] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, and △l3 is 8.

[0311] Taking a 1-symbol DMRS as an example, based on the above introduction, the time-domain positions of the DMRS sets designed for 15kHz and 30kHz subcarrier spacings on the PDSCH can be shown in Table 3.

[0312] Table 3

[0313]

[0314] In other embodiments, the temporal position of the DMRS set on the PDSCH can be uniformly designed for different subcarrier intervals. Taking a 15kHz and 60kHz subcarrier interval as examples, when designing the temporal position of the DMRS set on the PDSCH for different subcarrier intervals, the value of Δl needs to be such that the number of candidate PDSCHs meeting the first condition is greater than or equal to a first threshold under different subcarrier intervals. Furthermore, in other embodiments, the number of candidate PDSCHs meeting the second condition under different subcarrier intervals is less than or equal to a second threshold. For example, the first threshold can be 1, and the second threshold can be 1 or 0, etc. As an example, the method of uniformly designing the temporal position of the DMRS set on the PDSCH for different subcarrier intervals can be illustrated in Table 4.

[0315] Table 4

[0316]

[0317] It should be understood that for DMRS sets corresponding to 60kHz, 120kHz, or 240kHz subcarrier spacings, the time-domain position of the DMRS set on the PDSCH can be predefined with reference to the methods used for 15kHz or 30kHz subcarrier spacings. Alternatively, the predefined time-domain position of the DMRS set on the PDSCH can be used in scenarios with 15kHz or 30kHz subcarrier spacings. For example, when the DMRS set corresponds to a 60kHz subcarrier spacing, the predefined time-domain position of the DMRS set on the PDSCH used in the 15kHz subcarrier spacing scenario can be used, as can the predefined time-domain position of the DMRS set on the PDSCH used in the 30kHz subcarrier spacing scenario.

[0318] Furthermore, this application can also be applied to 2-symbol DMRS, or 3-symbol DMRS, etc. Taking 2-symbol DMRS as an example, the method of defining the time-domain location of the DMRS set on the PDSCH is introduced.

[0319] Scene 5:

[0320] Taking a DMRS set and a CRS set as examples, where the frame structure parameter is a 15kHz subcarrier spacing, it should be noted that a 15kHz subcarrier spacing in the DMRS set can be understood as the 15kHz subcarrier spacing used in NR, and a 15kHz subcarrier spacing in the CRS set can be understood as the 15kHz subcarrier spacing used in LTE.

[0321] Taking subframe i as shown in Figure 2A in LTE as an example, the temporal position of each CRS in the CRS set on subframe i can be seen as shown in Figure 9A. It can be understood that when the temporal position of each CRS in the CRS set on subframe i can be seen as shown in Figure 9A, the CRS pattern is the CRS pattern shown in Figure 6C when the antenna port is 4. Referring to Figure 2A, subframe i includes 14 symbols, from symbol 0 to symbol 13, and the start time of subframe i is T1. Taking PDSCH scheduling based on type B on time slot j in NR as an example, time slot j, as shown in Figure 3, includes 14 symbols, from symbol 0 to symbol 13, and the start time of time slot j is T2, with T1 and T2 being the same time.

[0322] When N is 2, the DMRS set includes the first DMRS and the second DMRS. The first DMRS and the second DMRS are 2-symbol DMRS. The time-domain position of the first DMRS on the PDSCH is the starting symbol l0 and the symbol (l0+1) of the PDSCH. Then, the time-domain position of the second DMRS on the PDSCH is the symbol (l0+Δl) and the symbol (l0+Δl+1) of the PDSCH. Δl can be understood as the number of symbols that differ between the starting symbols of the first DMRS and the second DMRS. The starting symbol of the first DMRS can be understood as the starting symbol of the PDSCH, and the starting symbol of the second DMRS can be understood as the symbol (l0+Δl) of the PDSCH.

[0323] As shown in Figure 14A, when scheduling a 9-symbol PDSCH in time slot j, with Δl = 3 and the starting symbol of the PDSCH not coinciding with the temporal position of the CRS set, the candidate PDSCHs for the 9-symbol PDSCH are candidate PDSCH1, candidate PDSCH2, and candidate PDSCH3. For example, taking candidate PDSCH1 as an example, the temporal position of the first DMRS on candidate PDSCH1 is symbol 1 and symbol 2 in time slot j, so the starting symbol of the first DMRS is symbol 1 in time slot j. The temporal position of the second DMRS on candidate PDSCH2 is symbol 4 and symbol 5 in time slot j, so the starting symbol of the second DMRS is symbol 4 in time slot j. As can be seen from Figure 14A, for a 9-symbol PDSCH, when Δl = 2, the number of candidate PDSCHs satisfying the first condition is 2, namely candidate PDSCH2 and candidate PDSCH3. If the starting symbol of the PDSCH does not coincide with the time domain position of the CRS set, the number of PDSCHs that satisfy the second condition is also 1, which is candidate PDSCH1.

[0324] Similarly, Figures 14B to 14E are schematic diagrams of the temporal position of the DMRS set on the candidate PDSCH when 9 symbols of PDSCH are scheduled on time slot j, Δl = 4 to 7, and the starting symbol of the PDSCH does not coincide with the temporal position of the CRS set. Figure 14F is a schematic diagram of the temporal position of the DMRS set on the candidate PDSCH when 10 symbols of PDSCH are scheduled on time slot j, Δl = 8, and the starting symbol of the PDSCH does not coincide with the temporal position of the CRS set.

[0325] Taking a 2-symbol DMRS as an example, Figures 15A to 15E show the frame structure parameters of the DMRS set and the CRS set, respectively, with a subcarrier spacing of 15kHz. The temporal positions of each CRS in the CRS set on subframe i can be as shown in Figure 9 (B). With N equal to 2, and 9-symbol PDSCH scheduled in time slot j, Δl = 3 to 7, and the starting symbol of the PDSCH not coinciding with the temporal position of the CRS set, the temporal position of the DMRS set on the candidate PDSCH is shown. Figure 15F shows the temporal position of the DMRS set on the candidate PDSCH when 10-symbol PDSCH is scheduled in time slot j, Δl = 8, and the starting symbol of the PDSCH does not coincide with the temporal position of the CRS set.

[0326] Taking a 2-symbol DMRS as an example, Figures 16A to 16E show the frame structure parameters of the DMRS set with a subcarrier spacing of 30kHz and the CRS set with a subcarrier spacing of 15kHz. The temporal positions of each CRS in the CRS set on subframe i can be as shown in Figure 9A. With N being 2, 9-symbol PDSCH is scheduled on time slot j, Δl = 3 to 7, and the starting symbol of the PDSCH does not coincide with the temporal position of the CRS set. Figure 16F shows the temporal position of the DMRS set on the candidate PDSCH when 10-symbol PDSCH is scheduled on time slot j, Δl = 8, and the starting symbol of the PDSCH does not coincide with the temporal position of the CRS set.

[0327] Taking a 2-symbol DMRS as an example, Figures 17A to 17E show the frame structure parameters of the DMRS set with a subcarrier spacing of 30kHz and the CRS set with a subcarrier spacing of 15kHz. The temporal positions of each CRS in the CRS set on subframe i can be as shown in Figure 9B. With N set being 2, 9-symbol PDSCH is scheduled on time slot j, Δl = 3 to 7, and the starting symbol of the PDSCH does not coincide with the temporal position of the CRS set. Figure 17F shows the temporal position of the DMRS set on the candidate PDSCH when 10-symbol PDSCH is scheduled on time slot j, Δl = 8, and the starting symbol of the PDSCH does not coincide with the temporal position of the CRS set.

[0328] Combining Figures 14A-14F, 15A-15F, 16A-16F, and 17A-17F, with N set to 2, and the frame structure parameters of the DMRS set being 15kHz and 30kHz subcarrier spacing, the statistical results of the number of candidate PDSCHs satisfying the first condition under different Δl conditions when the PDSCH duration L is 9 and 10 are shown in Table 5.

[0329] Table 5

[0330]

[0331] Based on Table 5, the value of the first threshold can be set according to the actual situation. For example, if the first threshold is set to 1, for a 15kHz subcarrier spacing, when Δl = 7, and the PDSCH duration L = 9 or 10 symbols and the CRS antenna ports are 2 or 4, the number of candidate PDSCHs that meet the first condition is greater than or equal to the first threshold. Therefore, the time-domain position of the DMRS set on the PDSCH can be defined by the communication protocol as the start symbol l0 of the PDSCH and the symbol (l0+7) of the PDSCH. For example, the time-domain position of the DMRS set on the PDSCH can be defined in the communication protocol as the start symbol l0 of the PDSCH and the symbol (l0+7) of the PDSCH:

[0332] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl, Δl is 7; or...

[0333] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l, and △l is 7.

[0334] In the case of a 15kHz subcarrier spacing, the time-domain position of the DMRS set indicated by the first indication information on the PDSCH is the start symbol l0 of the PDSCH and the symbol (l0+7) of the PDSCH.

[0335] For example, if the first threshold is 1, for a 30kHz subcarrier spacing, when Δl = 6 or 7, and the duration of the PDSCH is L = 9 or 10 symbols, and the antenna ports of the CRS are 2 or 4, the number of candidate PDSCHs that meet the first condition is greater than or equal to the first threshold. Therefore, the time domain position of the DMRS set on the PDSCH can be defined by the communication protocol as the starting symbol l0 and symbol (l0+1) of the PDSCH, and the symbols (l0+7) and (l0+8) of the PDSCH; or, the starting symbol l0 and symbol (l0+1) of the PDSCH, and the symbols (l0+7) and (l0+8) of the PDSCH.

[0336] When the duration L of the PDSCH is 10, and the first threshold is 1, for a subcarrier spacing of 30kHz, when Δl = 8, and the antenna ports of the CRS are 2 or 4, the number of candidate PDSCHs that meet the first condition is greater than or equal to the first threshold. Therefore, the time domain position of the DMRS set on the PDSCH can be defined by the communication protocol as the starting symbol l0 and symbol (l0+1) of the PDSCH, and the symbols (l0+8) and (l0+9) of the PDSCH.

[0337] Furthermore, the temporal position of the DMRS set on the PDSCH can be unified for different subcarrier intervals. For example, taking a first threshold value of 1, for 15kHz and 30kHz subcarrier intervals, when Δl = 7, the number of candidate PDSCHs meeting the first condition is greater than or equal to the first threshold. Therefore, the temporal position of the DMRS set on the PDSCH can be defined by the communication protocol as the starting symbol l0 and the (l0+1)th symbol of the PDSCH, and the symbols (l0+7) and (l0+8) of the PDSCH. In this case, regardless of whether the subcarrier interval is 15kHz or 30kHz, when scheduling a 9-symbol or 10-symbol PDSCH in time slot j, the temporal position of the DMRS set on that PDSCH is the starting symbol l0 and the symbol (l0+1), and the symbols (l0+7) and (l0+8) of the PDSCH.

[0338] For the implementations where N takes the value of 3 and 4, please refer to the relevant introduction in the DMRS documentation (symbol 1), which will not be repeated here.

[0339] Based on the above embodiments, as shown in FIG18, this application embodiment also provides a communication method, which specifically includes the following steps.

[0340] 1801. The network device sends a first indication information to the terminal device. The first indication information is used to indicate the time domain position of the DMRS set on the PDSCH. The DMRS set includes N DMRS.

[0341] 1082. The network device sends the first indication information to the terminal device, and the second indication information is used to indicate the PDSCH of the schedule.

[0342] 1803, the terminal device receives the first instruction information and the second instruction information, and based on the first instruction information and the second instruction information, receives the data sent by the network device on the scheduled PDSCH.

[0343] When N is 2, the DMRS set includes the first DMRS and the second DMRS, and the indication information is specifically used to indicate:

[0344] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl, Δl is 7; or...

[0345] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl, Δl is 8; or...

[0346] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+Δl, Δl is 7; or...

[0347] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+Δl, Δl is 8; or...

[0348] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l, and △l is 9;

[0349] Wherein, L is used to indicate the total number of symbols in the PDSCH; l0 is used to indicate the start symbol of the PDSCH, and l0 is used to indicate the start symbol of the first DMRS on the PDSCH; Δl is used to indicate the number of symbols that differ between the start symbols of the first DMRS and the start symbols of the second DMRS; l0+Δl is used to indicate the start symbol of the second DMRS on the PDSCH.

[0350] When N is 3, the first indication information is specifically used to indicate:

[0351] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, Δl2 is 7; or...

[0352] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, Δl2 is 7; or...

[0353] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, Δl2 is 8; or...

[0354] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, Δl2 is 8; or...

[0355] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, Δl2 is 7; or...

[0356] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 3, Δl2 is 7; or...

[0357] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+Δl1, l0+Δl2, Δl1 is 2, Δl2 is 8; or...

[0358] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, △l1 is 3, △l2 is 8;

[0359] Wherein, L indicates the total number of symbols in the PDSCH; l0 indicates the start symbol of the PDSCH, and l0 also indicates the start symbol of the first DMRS on the PDSCH; Δl1 indicates the number of symbols that differ between the start symbols of the first DMRS and the start symbols of the second DMRS; Δl2 indicates the number of symbols that differ between the start symbols of the first DMRS and the start symbols of the third DMRS; l0+Δl1 indicates the start symbol of the second DMRS on the PDSCH; and l0+Δl2 indicates the start symbol of the third DMRS on the PDSCH.

[0360] When N is 4, the first indication information is specifically used to indicate:

[0361] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, △l3 is 8; or...

[0362] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 3, △l2 is 6, △l3 is 8; or...

[0363] The PDSCH mapping type is type B, L is 9, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 2, △l2 is 4, △l3 is 7; or...

[0364] The PDSCH mapping type is type B, L is 10, l0 is 0, l0+△l1, l0+△l2, l0+△l3, △l1 is 2, △l2 is 4, and △l3 is 7;

[0365] Wherein, L is used to indicate the total number of symbols in the PDSCH; l0 is used to indicate the starting symbol of the PDSCH, and l0 is used to indicate the starting symbol of the first DMRS on the PDSCH; △l1 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the second DMRS; △l2 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the third DMRS; △l3 is used to indicate the number of symbols that differ between the starting symbols of the first DMRS and the fourth DMRS; l0+△l1 is used to indicate the starting symbol of the second DMRS on the PDSCH; l0+△l2 is used to indicate the starting symbol of the third DMRS on the PDSCH; and l0+△l3 is used to indicate the starting symbol of the fourth DMRS on the PDSCH.

[0366] In Figure 18, the temporal position of the DMRS set on the PDSCH is predefined by the protocol. The relevant predefined method can be found in the above introduction and will not be repeated here.

[0367] The various embodiments in this application can be used individually or in combination to achieve different technical effects.

[0368] The communication methods provided in the embodiments of this application above are described from the perspective of the terminal device as the executing entity. To implement the functions of the communication methods provided in the embodiments of this application above, the terminal device may include hardware structures and / or software modules, implementing the above functions in the form of hardware structures, software modules, or a combination of hardware structures and software modules. Whether a particular function is executed in the form of hardware structures, software modules, or a combination of hardware structures and software modules depends on the specific application and design constraints of the technical solution.

[0369] Similar to the above concept, as shown in FIG19, this application embodiment also provides a device 1900, which includes a transceiver module 1902 and a processing module 1901.

[0370] In one example, device 1900 is used to implement the functions of the terminal device in the above method. Device 1900 can be the terminal device itself, or a device within the terminal device. This device can be a chip system. In this embodiment, the chip system can be composed of chips, or it can include chips and other discrete components.

[0371] The processing module 1901 is used to receive data from the network device through the transceiver module 1902 based on the first indication information and the second indication information. The transceiver module 1902 is used to receive the first indication information from the network device, or to receive the second indication information from the network device.

[0372] In one example, device 1900 is used to implement the functions of the network device in the above method. Device 1900 can be a network device or a device in a second terminal device. This device can be a chip system. In this embodiment, the chip system can be composed of chips or can include chips and other discrete components.

[0373] The transceiver module 1902 is used to send a first indication message, or a second indication message, to the terminal device, or to send data to the terminal device. The processing module 1901 is used to schedule the data to the PDSCH indicated by the second indication message and send the data to the terminal device through the transceiver module 1902.

[0374] For the specific execution process of processing module 1901 and transceiver module 1902, please refer to the description in the above method embodiments. The module division in this application embodiment is illustrative and only represents a logical functional division. In actual implementation, there may be other division methods. Furthermore, the functional modules in the various embodiments of this application can be integrated into a processor, exist as separate physical entities, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0375] Similar to the above concept, as shown in FIG20, this application embodiment also provides a device 2000.

[0376] In one example, the device 2000 is used to implement the functions of the terminal device in the above method. The device 2000 can be the terminal device itself, or a device within the terminal device. The device 2000 includes at least one processor 2001, used to implement the functions of the terminal device in the above method. For example, the processor 2001 can be used to receive data from a network device based on first indication information and second indication information, as detailed in the method description, and will not be repeated here.

[0377] In some embodiments, the device 2000 may further include at least one memory 2002 for storing program instructions and / or data. The memory 2002 is coupled to the processor 2001. The coupling in this embodiment is an intermittent coupling or communication connection between devices, units, or modules, and may be electrical, mechanical, or other forms, for information exchange between devices, units, or modules. Alternatively, the memory 2002 may be located outside the device 2000. The processor 2001 may operate in conjunction with the memory 2002. The processor 2001 may execute program instructions stored in the memory 2002. At least one of the at least one memory may be included in the processor.

[0378] In some embodiments, the device 2000 may further include a communication interface 2003 for communicating with other devices via a transmission medium, thereby enabling the device in the device 2000 to communicate with other devices. Exemplarily, the communication interface 2003 may be a transceiver, circuit, bus, module, or other type of communication interface, and the other device may be a second terminal device or a network device. The processor 2001 uses the communication interface 2003 to send and receive data and to implement the methods in the above embodiments. Exemplarily, the communication interface 2003 may be used to receive first indication information, second indication information, or data sent by a network device.

[0379] In one example, the device 2000 is used to implement the functions of the network device in the above method. The device 2000 can be a network end device or a device within the network device. The device 2000 has at least one processor 2001, which is used to implement the functions of the network device in the above method. For example, the processor 2001 can schedule data to the PDSCH indicated by the second indication information and send data to the terminal device. For details, please refer to the detailed description in the method, which will not be described here.

[0380] In some embodiments, the device 2000 may further include at least one memory 2002 for storing program instructions and / or data. The memory 2002 is coupled to the processor 2001. The coupling in this embodiment is an intermittent coupling or communication connection between devices, units, or modules, and may be electrical, mechanical, or other forms, for information exchange between devices, units, or modules. Alternatively, the memory 2002 may be located outside the device 2000. The processor 2001 may operate in conjunction with the memory 2002. The processor 2001 may execute program instructions stored in the memory 2002. At least one of the at least one memory may be included in the processor.

[0381] In some embodiments, the device 2000 may further include a communication interface 2003 for communicating with other devices via a transmission medium, thereby enabling the device in the device 2000 to communicate with other devices. Exemplarily, the communication interface 2003 may be a transceiver, circuit, bus, module, or other type of communication interface, and the other device may be a second terminal device or a network device. The processor 2001 uses the communication interface 2003 to send and receive data and to implement the methods in the above embodiments. Exemplarily, the communication interface 2003 may be used to send first indication information, or second indication information, or data to the terminal device.

[0382] This application embodiment does not limit the connection medium between the communication interface 2003, processor 2001, and memory 2002. For example, in Figure 18, this application embodiment shows that the memory 2002, processor 2001, and communication interface 2003 can be connected via a bus, which can be divided into an address bus, a data bus, a control bus, etc.

[0383] In the embodiments of this application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly manifested as being executed by a hardware processor, or executed by a combination of hardware and software modules within the processor.

[0384] In the embodiments of this application, the memory can be non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), or it can be volatile memory, such as random-access memory (RAM). Memory is any other medium capable of carrying or storing desired program code in the form of instructions or data structures, and accessible by a computer, but is not limited thereto. The memory in the embodiments of this application can also be a circuit or any other device capable of implementing storage functions, used to store program instructions and / or data.

[0385] The methods provided in this application can be implemented entirely or partially through software, hardware, firmware, or any combination thereof. When implemented in software, they can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user equipment, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs (DVDs)), or semiconductor media (e.g., SSDs), etc.

[0386] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A communication method, characterized in that, the method includes: receiving first indication information from a network device; the first indication information is used to indicate the time domain position of a demodulation reference signal (DMRS) set on a physical downlink shared channel (PDSCH); the DMRS set includes N DMRSs; receiving data sent by the network device on the PDSCH based on the first indication information; when N is 2, the DMRS set includes a first DMRS and a second DMRS, and the lengths of both the first DMRS and the second DMRS in the time domain are 1 symbol, then the first indication information is specifically used to indicate: The PDSCH mapping type is type B, L is 9, l 0 is 0, Δl 1 is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, Δl 1 is 7; Or, when N is 2, the DMRS set includes a first DMRS and a second DMRS, and the lengths of both the first DMRS and the second DMRS in the time domain are 2 symbols, then the first indication information is specifically used to indicate: The PDSCH mapping type is type B, L is 9, l 0 is 0, Δl 1 is 5; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, Δl 1 is 7; Or, when N is 3, the DMRS set includes a first DMRS, a second DMRS, and a third DMRS, and the lengths of the first DMRS, the second DMRS, and the third DMRS in the time domain are all 1 symbol, then the first indication information is specifically used to indicate: The PDSCH mapping type is type B, L is 9, l 0 is 0, Δl 1 is 4, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, Δl 1 is 4, Δl 2 is 7; Among them, L is used to indicate the total number of symbols of the PDSCH; l 0 is used to indicate the starting symbol of the first DMRS on the PDSCH; Δl 1 is used to indicate the number of symbols between the starting symbol of the PDSCH and the starting symbol of the second DMRS on the PDSCH; Δl 2 is used to indicate the number of symbols between the starting symbol of the PDSCH and the starting symbol of the third DMRS on the PDSCH.

2. The method according to claim 1, characterized in that, the method further includes: receiving second indication information sent by the network device, where the second indication information is used to schedule the PDSCH.

3. The method according to claim 1 or 2, characterized in that, l 0 +Δl 1 used to indicate the starting symbol of the second DMRS on the PDSCH, l 0 +Δl 2 used to indicate the starting symbol of the third DMRS on the PDSCH.

4. The method according to any one of claims 1 to 3, characterized in that, the starting symbol of the first DMRS on the PDSCH is the starting symbol of the PDSCH.

5. The method according to any one of claims 1 to 4, characterized in that, l 0 Specifically used to indicate the number of symbols between the starting symbol of the PDSCH and the starting symbol of the first DMRS on the PDSCH.

6. The method according to any one of claims 1 to 5, characterized in that, among M candidate PDSCHs of the PDSCH, the number of candidate PDSCHs meeting a first condition is greater than or equal to a first threshold, where the first condition is: on the candidate PDSCH, the time domain position of a candidate DMRS set obtained based on the first indication information does not coincide with the time domain position of a cell common signal (CRS) set on the candidate PDSCH; M is a positive integer greater than or equal to 2.

7. The method according to claim 6, characterized in that, among the M candidate PDSCHs, the number of candidate PDSCHs meeting a second condition is less than or equal to a second threshold; the second condition is: on the candidate PDSCH, there is an overlap between the time domain position of a candidate DMRS set obtained based on the first indication information and the time domain position of the CRS set on the candidate PDSCH.

8. The method according to claim 6 or 7, characterized in that, the frame structure parameter corresponding to the CRS set is: 15 kHz subcarrier spacing.

9. The method according to any one of claims 1 to 8, characterized in that, the frame structure parameter corresponding to the DMRS set is: 15 kHz subcarrier spacing, 30 kHz subcarrier spacing, 60 kHz subcarrier spacing, or 120 kHz subcarrier spacing.

10. A communication method, characterized in that, the method includes: sending first indication information to a terminal device; the first indication information is used to indicate the time domain position of a demodulation reference signal (DMRS) set on a physical downlink shared channel (PDSCH); the DMRS set includes N DMRSs; sending data to the terminal device on the PDSCH; when N is 2, the DMRS set includes a first DMRS and a second DMRS, and the lengths of both the first DMRS and the second DMRS in the time domain are 1 symbol, then the first indication information is specifically used to indicate: The PDSCH mapping type is type B, L is 9, l 0 is 0, Δl 1 is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, Δl 1 is 7; Or, when N is 2, the DMRS set includes a first DMRS and a second DMRS, and the lengths of both the first DMRS and the second DMRS in the time domain are 2 symbols, then the first indication information is specifically used to indicate: The PDSCH mapping type is type B, L is 9, l 0 is 0, Δl 1 is 5; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, Δl 1 is 7; Or, when N is 3, the DMRS set includes a first DMRS, a second DMRS, and a third DMRS, and the lengths of both the first DMRS, the second DMRS, and the third DMRS in the time domain are 1 symbol, then the first indication information is specifically used to indicate: The PDSCH mapping type is type B, L is 9, l 0 is 0, Δl 1 is 4, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, Δl 1 is 4, Δl 2 is 7; Wherein, L is used to indicate the total number of symbols of the PDSCH; l 0 is used to indicate the starting symbol of the first DMRS on the PDSCH; Δl 1 is used to indicate the number of symbols between the starting symbol of the PDSCH and the starting symbol of the second DMRS on the PDSCH; Δl 2 is used to indicate the number of symbols between the starting symbol of the PDSCH and the starting symbol of the third DMRS on the PDSCH.

11. The method according to claim 10, characterized in that, the method further includes: sending second indication information to the terminal device, the second indication information is used to schedule the PDSCH.

12. The method according to claim 10 or 11, characterized in that, l 0 +Δl 1 used to indicate the starting symbol of the second DMRS on the PDSCH, l 0 +Δl 2 used to indicate the starting symbol of the third DMRS on the PDSCH.

13. The method according to any one of claims 10 to 12, characterized in that, the starting symbol of the first DMRS on the PDSCH is the starting symbol of the PDSCH.

14. The method according to any one of claims 10 to 13, characterized in that, l 0 Specifically used to indicate the number of symbols between the starting symbol of the PDSCH and the starting symbol of the first DMRS on the PDSCH.

15. The method according to any one of claims 10 to 14, characterized in that, among M candidate PDSCHs of the PDSCH, the number of candidate PDSCHs that meet a first condition is greater than or equal to a first threshold, the first condition is: on the candidate PDSCH, the time domain position of a candidate DMRS set obtained based on the first indication information does not coincide with the time domain position of a cell common signal (CRS) set on the candidate PDSCH; M is a positive integer greater than or equal to 2.

16. The method according to claim 15, characterized in that, among the M candidate PDSCHs, the number of candidate PDSCHs that meet a second condition is less than or equal to a second threshold; the second condition is: on the candidate PDSCH, the time domain position of a candidate DMRS set obtained based on the first indication information coincides with the time domain position of the CRS set on the candidate PDSCH.

17. The method according to claim 15 or 16, characterized in that, the frame structure parameter corresponding to the CRS set is: 15 kHz subcarrier spacing.

18. The method according to any one of claims 10 to 17, characterized in that, The frame structure parameters corresponding to the DMRS set are: 15 kHz subcarrier spacing, 30 kHz subcarrier spacing, 60 kHz subcarrier spacing, or 120 kHz subcarrier spacing.

19. A communication method, characterized in that, the method includes: receiving first indication information from a network device; the first indication information is used to indicate the time domain position of a demodulation reference signal DMRS set on a physical downlink shared channel PDSCH; the DMRS set includes N DMRSs; wherein, among M candidate PDSCHs of the PDSCH, the number of candidate PDSCHs meeting a first condition is greater than or equal to a first threshold; the first condition is: on the candidate PDSCH, the time domain position of a candidate DMRS set obtained based on the first indication information does not coincide with the time domain position of a cell common signal CRS set on the candidate PDSCH; N and M are positive integers greater than or equal to 2 respectively; receiving second indication information from the network device, the second indication information is used to indicate a first PDSCH; the first PDSCH is a candidate PDSCH among the M candidate PDSCHs that meets the first condition; receiving data sent by the network device on the first PDSCH based on the first indication information and the second indication information.

20. The method according to claim 19, characterized in that, among the M candidate PDSCHs, the number of candidate PDSCHs meeting a second condition is less than or equal to a second threshold; the second condition is: on the candidate PDSCH, the time domain position of a candidate DMRS set obtained based on the first indication information coincides with the time domain position of a CRS set on the candidate PDSCH.

21. The method according to claim 19 or 20, characterized in that, the frame structure parameters corresponding to the DMRS set are: 15 kHz subcarrier spacing, 30 kHz subcarrier spacing, 60 kHz subcarrier spacing, or 120 kHz subcarrier spacing.

22. The method according to any one of claims 19 to 21, characterized in that, the frame structure parameters corresponding to the CRS set are: 15 kHz subcarrier spacing.

23. The method according to any one of claims 19 to 21, characterized in that, the length of the DMRS in the N DMRSs in the time domain is one orthogonal frequency division multiplexing OFDM symbol or K consecutive OFDM symbols, and K is a positive integer greater than or equal to 2.

24. The method according to any one of claims 19 to 23, characterized in that, the length of the PDSCH in the time domain is L OFDM symbols, and L is a positive integer greater than or equal to the second threshold.

25. The method according to any one of claims 19 to 24, characterized in that, if N is 2, the DMRS set includes a first DMRS and a second DMRS, and the first indication information is specifically used to indicate: The PDSCH mapping type is type B, L is 9, and l 0 is 0, and l 0 +Δl, where Δl is 5; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl, where Δl is 7; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl, where Δl is 8; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl, where Δl is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl, where Δl is 8; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl, where Δl is 9; where L is used to indicate the total number of symbols of the PDSCH; l 0 is used to indicate the starting symbol of the PDSCH, and l 0 is used to indicate the starting symbol of the first DMRS on the PDSCH; Δl is used to indicate the number of symbols between the starting symbol of the first DMRS on the PDSCH and the starting symbol of the second DMRS on the PDSCH; l 0 +Δl is used to indicate the starting symbol of the second DMRS on the PDSCH.

26. The method according to any one of claims 19 to 24, characterized in that, If N is 3, the DMRS set includes a first DMRS, a second DMRS, and a third DMRS, and the first indication information is specifically used to indicate: The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 and l 0 +Δl 2 and Δl 1 is 2, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,Δl 1 is 3, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,Δl 1 is 4, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,Δl 1 is 2, Δl 2 is 8; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,Δl 1 is 3, Δl 2 is 8; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,Δl 1 is 2, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,Δl 1 is 3, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 and l 0 +Δl 2 and Δl 1 is 4, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 and l 0 +Δl 2 and Δl 1 is 2, Δl 2 is 8; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 and l 0 +Δl 2 and Δl 1 is 3, Δl 2 is 8; where L is used to indicate the total number of symbols of the PDSCH; l 0 is used to indicate the starting symbol of the PDSCH, and l 0 is used to indicate the starting symbol of the first DMRS on the PDSCH; Δl 1 is used to indicate the number of symbols between the starting symbol of the first DMRS on the PDSCH and the starting symbol of the second DMRS on the PDSCH; Δl 2 is used to indicate the number of symbols between the starting symbol of the first DMRS on the PDSCH and the starting symbol of the third DMRS on the PDSCH; l 0 +Δl 1 is used to indicate the starting symbol of the second DMRS on the PDSCH; l 0 +Δl 2 is used to indicate the starting symbol of the third DMRS on the PDSCH.

27. The method according to any one of claims 19 to 24, characterized in that if N is 4, the DMRS set includes a first DMRS, a second DMRS, a third DMRS, and a fourth DMRS; the first indication information is specifically used to indicate: The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,l 0 +Δl 3 ,Δl 1 is 3, Δl 2 is 6, Δl 3 is 8; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,l 0 +Δl 3 ,Δl 1 is 3, Δl 2 is 6, Δl 3 is 8; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,l 0 +Δl 3 ,Δl 1 is 2, Δl 2 is 4, Δl 3 is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,l 0 +Δl 3 ,Δl 1 is 2, Δl 2 is 4, Δl 3 is 7; where L is used to indicate the total number of symbols of the PDSCH; l 0 is used to indicate the starting symbol of the PDSCH, and l 0 is used to indicate the starting symbol of the first DMRS on the PDSCH; Δl 1 is used to indicate the number of symbols between the starting symbol of the first DMRS on the PDSCH and the starting symbol of the second DMRS on the PDSCH; Δl 2 is used to indicate the number of symbols between the starting symbol of the first DMRS on the PDSCH and the starting symbol of the third DMRS on the PDSCH; Δl 3 is used to indicate the number of symbols between the starting symbol of the first DMRS on the PDSCH and the starting symbol of the fourth DMRS on the PDSCH; l 0 +Δl 1 is used to indicate the starting symbol of the second DMRS on the PDSCH; l 0 +Δl 2 is used to indicate the starting symbol of the third DMRS on the PDSCH; l 0 +Δl 3 is used to indicate the starting symbol of the fourth DMRS on the PDSCH.

28. A communication method, characterized in that the method includes: sending first indication information to a terminal device; the first indication information is used to indicate the time domain position of a demodulation reference signal (DMRS) set on a physical downlink shared channel (PDSCH); the DMRS set includes N DMRSs; wherein, among M candidate PDSCHs of the PDSCH, the number of candidate PDSCHs meeting a first condition is greater than or equal to a first threshold; the first condition is: on the candidate PDSCH, the time domain position of a candidate DMRS set obtained based on the first indication information does not coincide with the time domain position of a cell common signal (CRS) set on the candidate PDSCH; N and M are positive integers greater than or equal to 2; sending second indication information to the terminal device, the second indication information is used to indicate a first PDSCH; the first PDSCH is a PDSCH among the M candidate PDSCHs that meets the first condition; sending data to the terminal device on the first PDSCH.

29. The method according to claim 28, characterized in that among the M candidate PDSCHs, the number of candidate PDSCHs meeting a second condition is less than or equal to a second threshold; the second condition is: on the candidate PDSCH, the time domain position of a candidate DMRS set obtained based on the first indication information coincides with the time domain position of a CRS set on the candidate PDSCH.

30. The method according to claim 28 or 29, characterized in that the frame structure parameters corresponding to the DMRS set are: 15 kHz subcarrier spacing, 30 kHz subcarrier spacing, 60 kHz subcarrier spacing, or 120 kHz subcarrier spacing.

31. The method according to any one of claims 28 to 30, characterized in that the frame structure parameters corresponding to the CRS set are: 15 kHz subcarrier spacing.

32. The method according to any one of claims 28 to 31, characterized in that the length of one of the N DMRSs in the time domain is one orthogonal frequency division multiplexing (OFDM) symbol or K consecutive OFDM symbols, and K is a positive integer greater than or equal to 2.

33. The method according to any one of claims 28 to 32, characterized in that the length of the PDSCH in the time domain is L OFDM symbols, and L is a positive integer greater than or equal to the second threshold.

34. The method according to any one of claims 28 to 33, characterized in that if N is 2, the DMRS set includes a first DMRS and a second DMRS, and the first indication information is specifically used to indicate: The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl, where Δl is 5; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl, where Δl is 7; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl, where Δl is 8; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl, where Δl is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl, where Δl is 8; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl, where Δl is 9; where L is used to indicate the total number of symbols of the PDSCH; l 0 is used to indicate the starting symbol of the PDSCH, and l 0 is used to indicate the starting symbol of the first DMRS on the PDSCH; Δl is used to indicate the number of symbols between the starting symbol of the first DMRS on the PDSCH and the starting symbol of the second DMRS on the PDSCH; l 0 +Δl is used to indicate the starting symbol of the second DMRS on the PDSCH.

35. The method according to any one of claims 28 to 33, characterized in that, when N is 3, the DMRS set includes a first DMRS, a second DMRS, and a third DMRS, and the first indication information is specifically used to indicate: The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,Δl 1 is 2, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 and l 0 +Δl 2 and Δl 1 is 3, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,Δl 1 is 4, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,Δl 1 is 2, Δl 2 is 8; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 and l 0 +Δl 2 and Δl 1 is 3, Δl 2 is 8; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,Δl 1 is 2, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,Δl 1 is 3, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 and l 0 +Δl 2 and Δl 1 is 4, Δl 2 is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,Δl 1 is 2, Δl 2 is 8; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 and l 0 +Δl 2 and Δl 1 is 3, Δl 2 is 8; or, where L is used to indicate the total number of symbols of the PDSCH; l 0 is used to indicate the starting symbol of the PDSCH, and l 0 is used to indicate the starting symbol of the first DMRS on the PDSCH; Δl 1 is used to indicate the number of symbols between the starting symbol of the first DMRS on the PDSCH and the starting symbol of the second DMRS on the PDSCH; Δl 2 is used to indicate the number of symbols between the starting symbol of the first DMRS on the PDSCH and the starting symbol of the third DMRS on the PDSCH; l 0 +Δl 1 is used to indicate the starting symbol of the second DMRS on the PDSCH; l 0 +Δl 2 is used to indicate the starting symbol of the third DMRS on the PDSCH.

36. The method according to any one of claims 28 to 33, characterized in that, when N is 4, the DMRS set includes a first DMRS, a second DMRS, a third DMRS, and a fourth DMRS; the first indication information is specifically used to indicate: The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,l 0 +Δl 3 ,Δl 1 is 3, Δl 2 is 6, Δl 3 is 8; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,l 0 +Δl 3 ,Δl 1 is 3, Δl 2 is 6, Δl 3 is 8; or, The PDSCH mapping type is type B, L is 9, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,l 0 +Δl 3 ,Δl 1 is 2, Δl 2 is 4, Δl 3 is 7; or, The PDSCH mapping type is type B, L is 10, l 0 is 0, l 0 +Δl 1 ,l 0 +Δl 2 ,l 0 +Δl 3 ,Δl 1 is 2, Δl 2 is 4, Δl 3 is 7; where L is used to indicate the total number of symbols of the PDSCH; l 0 is used to indicate the starting symbol of the PDSCH, and l 0 is used to indicate the starting symbol of the first DMRS on the PDSCH; Δl 1 is used to indicate the number of symbols between the starting symbol of the first DMRS on the PDSCH and the starting symbol of the second DMRS on the PDSCH; Δl 2 is used to indicate the number of symbols between the starting symbol of the first DMRS on the PDSCH and the starting symbol of the third DMRS on the PDSCH; Δl 3 is used to indicate the number of symbols between the starting symbol of the first DMRS on the PDSCH and the starting symbol of the fourth DMRS on the PDSCH; l 0 +Δl 1 is used to indicate the starting symbol of the second DMRS on the PDSCH; l 0 +Δl 2 is used to indicate the starting symbol of the third DMRS on the PDSCH; l 0 +Δl 3 is used to indicate the starting symbol of the fourth DMRS on the PDSCH.

37. A communication device, characterized in that, it is used to implement the method according to any one of claims 1 to 9, or is used to implement the method according to any one of claims 19 to 27.

38. A communication device, characterized in that, it is used to implement the method according to any one of claims 10 to 18, or is used to implement the method according to any one of claims 28 to 36.

39. A communication device, characterized in that, it includes a processor and a memory, instructions are stored in the memory, and when the processor executes the instructions, the device executes the method according to any one of claims 1 to 9, or executes the method according to any one of claims 19 to 27.

40. A communication device, characterized in that, it includes a processor and a memory, instructions are stored in the memory, and when the processor executes the instructions, the device executes the method according to any one of claims 10 to 18, or executes the method according to any one of claims 28 to 36.

41. A computer-readable storage medium, characterized in that, the computer-readable storage medium stores instructions, and when the instructions run on a computer, the computer executes the method according to any one of claims 1 to 9, or 10 to 18, or 19 to 27, or 28 to 36.