# US 11,909,694 B2 · Methods and devices for data transmission with reference signals > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,694 B2 - Document ID: US11909694B2 - Status: Granted - Kind: B2 - Application number: 17/726,838 - Filed: 2022-04-22 - Published: 2022-08-11 - Granted: 2024-02-20 - Earliest claimed: 2022-04-22 - Assignees: NEC Corporation - Applicants: NEC Corporation - Inventors: Yukai Gao; Gang Wang - Web page: https://patentgrep.com/patent/US11909694B2 ## CPC - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/10: with dynamo-electric generation of carriers; with mechanical filters or demodulators - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 27/2605: {Symbol extensions, e.g. Zero Tail, Unique Word [UW]} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/0016: {Time-frequency-code} - H04L 5/0023: {Time-frequency-space} - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - 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 Embodiments of the present disclosure relate to methods and devices for data transmission. In example embodiments, a method implemented in a network device is provided. According to the method, a target RS port group is determined from a plurality of RS ports for transmitting a RS. The RS ports are associated with at least one network device. Then, a configuration of the target RS port group is transmitted to the terminal device. ## Claims ### Claim 1 A method performed by a terminal device, comprising: receiving information via a plurality of Physical Downlink Control Channels (PDCCHs) for scheduling a plurality of Physical Downlink Shared Channels (PDSCHs) from a plurality of Transmission Reception Points (TRPs); receiving information via the plurality of PDSCHs from the plurality of TRPs; and receiving a plurality of Demodulation Reference Signals (DMRSs) for the plurality of PDSCHs from the plurality of TRPs, wherein configurations of the plurality of DMRSs from the plurality of TRPs are same, wherein one of the configurations of the plurality of DMRSs is a DMRS configuration with respect to at least one of a DMRS configuration type, a first number of symbols for a front-loaded DMRS, and a second number of symbols for an additional DMRS. ### Claim 2 A terminal device comprising a processor configured to: receive information via a plurality of Physical Downlink Control Channels (PDCCHs) for scheduling a plurality of Physical Downlink Shared Channels (PDSCHs) from a plurality of Transmission Reception Points (TRPs); receive information via the plurality of PDSCHs from the plurality of TRPs; and receive a plurality of Demodulation Reference Signals (DMRSs) for the plurality of PDSCHs from the plurality of TRPs, wherein configurations of the plurality of DMRSs from the plurality of TRPs are same, wherein one of the configurations of the plurality of DMRSs is a DMRS configuration with respect to at least one of a DMRS configuration type, a first number of symbols for a front-loaded DMRS, and a second number of symbols for an additional DMRS. ### Claim 3 A method performed by a network device, comprising: transmitting information via a plurality of Physical Downlink Control Channels (PDCCHs) for scheduling a plurality of Physical Downlink Shared Channels (PDSCHs) to a terminal device; transmitting information via the plurality of PDSCHs to the terminal device; and transmitting a plurality of Demodulation Reference Signals (DMRSs) for the plurality of PDSCHs to the terminal device, wherein configurations of the plurality of DMRSs are same, wherein one of the configurations of the plurality of DMRSs is a DMRS configuration with respect to at least one of a DMRS configuration type, a first number of symbols for a front-loaded DMRS, and a second number of symbols for an additional DMRS. ### Claim 4 (depends on 1) The method of claim 1, wherein the DMRS configuration type is DMRS configuration type 1 or DMRS configuration type 2. ### Claim 5 (depends on 4) The method of claim 4, wherein the DMRS configuration type is configured by a Radio Resource Control (RRC) signaling. ### Claim 6 (depends on 1) The method of claim 1, wherein the number of symbols for the front-loaded DMRS is 1. ### Claim 7 (depends on 1) The method of claim 1, wherein the number of symbols for the front-loaded DMRS is configured by a Radio Resource Control (RRC) signaling and/or via a Downlink Control Information (DCI). ### Claim 8 (depends on 1) The method of claim 1, wherein the number of symbols for the additional DMRS is 0. ### Claim 9 (depends on 8) The method of claim 8, wherein the number of symbols for the additional DMRS being equal to 0 is configured by a Radio Resource Control (RRC) signaling. ### Claim 10 (depends on 2) The terminal device of claim 2, wherein the DMRS configuration type is DMRS configuration type 1 or DMRS configuration type 2. ### Claim 11 (depends on 10) The terminal device of claim 10, wherein the DMRS configuration type is configured by a Radio Resource Control (RRC) signaling. ### Claim 12 (depends on 2) The terminal device of claim 2, wherein the number of symbols for the front-loaded DMRS is 1. ### Claim 13 (depends on 2) The terminal device of claim 2, wherein the number of symbols for the front-loaded DMRS is configured by a Radio Resource Control (RRC) signaling and/or via a Downlink Control Information (DCI). ### Claim 14 (depends on 2) The terminal device of claim 2, wherein the number of symbols for the additional DMRS is 0. ### Claim 15 (depends on 14) The terminal device of claim 14, wherein the number of symbols for the additional DMRS being equal to 0 is configured by a Radio Resource Control (RRC) signaling. ### Claim 16 (depends on 3) The method of claim 3, wherein the DMRS configuration type is DMRS configuration type 1 or DMRS configuration type 2. ### Claim 17 (depends on 16) The method of claim 16, wherein the DMRS configuration type is configured by a Radio Resource Control (RRC) signaling. ### Claim 18 (depends on 3) The method of claim 3, wherein the number of symbols for the front-loaded DMRS is 1. ### Claim 19 (depends on 3) The method of claim 3, wherein the number of symbols for the front-loaded DMRS is configured by a Radio Resource Control (RRC) signaling and/or via a Downlink Control Information (DCI). ### Claim 20 (depends on 3) The method of claim 3, wherein the number of symbols for the additional DMRS is 0. ### Claim 21 (depends on 20) The method of claim 20, wherein the number of symbols for the additional DMRS being equal to 0 is configured by a Radio Resource Control (RRC) signaling.