# US 2021/0344462 A1 · Channel information sending method and apparatus and channel information receiving method and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0344462 A1 - Document ID: US20210344462A1 - Status: Published application - Kind: A1 - Application number: 17/376,521 - Filed: 2021-07-15 - Published: 2021-11-04 - Earliest claimed: 2019-01-16 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Shurong JIAO; Meng HUA; Han ZHOU - Web page: https://patentgrep.com/patent/US20210344462A1 ## CPC - H04L 5/0016: {Time-frequency-code} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0026: {Transmission of channel quality indication} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/006: {Quality of the received signal, e.g. BER, SNR, water filling} - H04L 5/0026: {Division using four or more dimensions, e.g. beam steering or quasi-co-location [QCL]} - H04L 5/0085: {when channel conditions change} - H04W 24/02: Arrangements for optimising operational condition - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Channel information sending methods or channel information receiving methods are provided. One example method includes that a network device configures for a terminal device Q DMRS ports used for measurement, where the Q DMRS ports used for measurement include M DMRS ports that can carry downlink data, and Q is greater than M; and selects, based on channel information of P DMRS ports that is sent by the terminal device, an appropriate DMRS port to send the downlink data, where the P DMRS ports belong to the Q DMRS ports used for measurement. ## Claims ### Claim 1 A channel information sending method, comprising: receiving configuration information from a network device, wherein the configuration information identifies Q demodulation reference signal (DMRS) ports used for measurement, and Q is a positive integer; receiving indication information from the network device, wherein the indication information indicates M DMRS ports, in the Q DMRS ports used for measurement, that carry downlink data, M is a positive integer, and Q is greater than M; and sending channel information of P DMRS ports to the network device, wherein the P DMRS ports belong to the Q DMRS ports used for measurement, and P is a positive integer. ### Claim 2 (depends on 1) The method according to claim 1, wherein the P DMRS ports belong to P1 DMRS port groups, and a quantity of DMRS ports comprised in any one of the P1 DMRS port groups is M. ### Claim 3 (depends on 2) The method according to claim 2, wherein the P1 DMRS port groups comprise a first DMRS port group and a second DMRS port group, and the first DMRS port group and the second DMRS port group correspond to different code division multiplexing (CDM) groups. ### Claim 4 (depends on 2) The method according to claim 2, wherein the P1 DMRS port groups are DMRS port groups of best channel quality among DMRS port groups to which the Q DMRS ports belong. ### Claim 5 (depends on 2) The method according to claim 2, wherein the P1 DMRS port groups comprise one DMRS port group to which the M DMRS ports that carry the downlink data belong and P1-1 DMRS port groups of best channel quality among DMRS port groups to which other DMRS ports belong, wherein the other DMRS ports are DMRS ports other than the M DMRS ports that carry the downlink data in the Q DMRS ports used for measurement. ### Claim 6 (depends on 2) The method according to claim 2, wherein the channel information comprises numbers of the P1 DMRS port groups. ### Claim 7 (depends on 6) The method according to claim 6, wherein the channel information further comprises a channel quality indicator (CQI) of the P1 DMRS port groups, modulation and coding scheme (MCS) information of the P1 DMRS port groups, or a combination of the CQI and the MCS information. ### Claim 8 An apparatus, comprising: at least one processor; and one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to cause the apparatus to: receive configuration information from a network device, wherein the configuration information identifies Q demodulation reference signal (DMRS) ports used for measurement, and Q is a positive integer; receive indication information from the network device, wherein the indication information indicates M DMRS ports, in the Q DMRS ports used for measurement, that carry downlink data, M is a positive integer, and Q is greater than M; and send channel information of P DMRS ports to the network device, wherein the P DMRS ports belong to the Q DMRS ports used for measurement, and P is a positive integer. ### Claim 9 (depends on 8) The apparatus according to claim 8, wherein the P DMRS ports belong to P1 DMRS port groups, and a quantity of DMRS ports comprised in any one of the P1 DMRS port groups is M. ### Claim 10 (depends on 9) The apparatus according to claim 9, wherein the P1 DMRS port groups comprise a first DMRS port group and a second DMRS port group, and the first DMRS port group and the second DMRS port group correspond to different code division multiplexing (CDM) groups. ### Claim 11 (depends on 9) The apparatus according to claim 9, wherein the P1 DMRS port groups are DMRS port groups of best channel quality among DMRS port groups to which the Q DMRS ports belong. ### Claim 12 (depends on 9) The apparatus according to claim 9, wherein the P1 DMRS port groups comprise one DMRS port group to which the M DMRS ports that carry the downlink data belong and P1-1 DMRS port groups of best channel quality among DMRS port groups to which other DMRS ports belong, wherein the other DMRS ports are DMRS ports other than the M DMRS ports that carry the downlink data in the Q DMRS ports used for measurement. ### Claim 13 (depends on 9) The apparatus according to claim 9, wherein the channel information comprises numbers of the P1 DMRS port groups. ### Claim 14 (depends on 13) The apparatus according to claim 13, wherein the channel information further comprises a channel quality indicator (CQI) of the P DMRS port groups, modulation and coding scheme (MCS) information of the P1 DMRS port groups, or a combination of the CQI and the MCS. ### Claim 15 An apparatus, comprising: at least one processor; and one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to cause the apparatus to: send configuration information to a terminal device, wherein the configuration information identifies Q demodulation reference signal (DMRS) ports used for measurement, and Q is a positive integer; and send indication information to the terminal device, wherein the indication information indicates M DMRS ports, in the Q DMRS ports used for measurement, that carry downlink data, M is a positive integer, and Q is greater than M; and receive channel information of P DMRS ports from the terminal device, wherein the P DMRS ports belong to the Q DMRS ports used for measurement, and P is a positive integer. ### Claim 16 (depends on 15) The apparatus according to claim 15, wherein the P DMRS ports belong to P1 DMRS port groups, and a quantity of DMRS ports comprised in any one of the P1 DMRS port groups is M. ### Claim 17 (depends on 16) The apparatus according to claim 16, wherein the P1 DMRS port groups comprise a first DMRS port group and a second DMRS port group, and the first DMRS port group and the second DMRS port group correspond to different code division multiplexing (CDM) groups. ### Claim 18 (depends on 16) The apparatus according to claim 16, wherein the P1 DMRS port groups are DMRS port groups of best channel quality among DMRS port groups to which the Q DMRS ports belong. ### Claim 19 (depends on 16) The apparatus according to claim 16, wherein the P1 DMRS port groups comprise one DMRS port group to which the M DMRS ports that carry the downlink data belong and P1-1 DMRS port groups of best channel quality among DMRS port groups to which other DMRS ports belong, wherein the other DMRS ports are DMRS ports other than the M DMRS ports that carry the downlink data in the Q DMRS ports used for measurement. ### Claim 20 (depends on 16) The apparatus according to claim 16, wherein the channel information comprises numbers of the P1 DMRS port groups.