# US 12,010,691 B2 · Method and apparatus for transmitting/receiving channels in mobile communication system supporting massive MIMO > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,010,691 B2 - Document ID: US12010691B2 - Status: Granted - Kind: B2 - Application number: 17/172,639 - Filed: 2021-02-10 - Published: 2021-06-03 - Granted: 2024-06-11 - Earliest claimed: 2012-04-06 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Younsun Kim; Aris Papasakellariou; Kiil Kim; Juho Lee; Hyojin Lee; Joonyoung Cho - Web page: https://patentgrep.com/patent/US12010691B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 72/02: Selection of wireless resources by user or terminal - H04W 72/04: Wireless resource allocation - H04B 7/0413: MIMO systems - H04L 5/0023: {Time-frequency-space} - H04W 84/042: {Public Land Mobile systems, e.g. cellular systems} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION ## Abstract A channel transmission/reception method and an apparatus for transmitting/receiving channels between a base station and a mobile terminal efficiently in a mobile communication supporting massive Multiple Input Multiple Output (MIMO) transmission are provided. The method includes determining a resource to which a Demodulation Reference Signal (DMRS) addressed to a terminal is mapped within a resource block, the DMRS resource being positioned in at least one of a first resource set capable of being allocated for DMRS and a second resource set symmetric with the first resource set on a time axis, and transmitting the DMRS and DMRS allocation information to the terminal. ## Claims ### Claim 1 A method performed by a terminal in a mobile communication system, the method comprising: receiving, from a base station, downlink scheduling information for downlink data on a physical downlink control channel, wherein the downlink scheduling information includes demodulation reference signal (DMRS) configuration information indicating a number of a DMRS group and at least one DMRS antenna port allocated to the terminal, and wherein a set of the DMRS group corresponding to the number of the DMRS group comprises one or more DMRS groups that are predefined, and each DMRS group corresponds to a plurality of DMRS antenna ports; and receiving, from the base station, the downlink data and a DMRS associated with the at least one allocated DMRS antenna port, wherein resources for the one or more DMRS groups are not used for carrying the downlink data, and wherein, based on the DMRS configuration information corresponding to a first value, the set of the DMRS group comprises the at least one allocated DMRS antenna port indicated by the DMRS configuration information and at least one DMRS antenna port that is not allocated to the terminal. ### Claim 2 (depends on 1) The method of claim 1, wherein in case that the number of the DMRS group is 1, the set of the DMRS group includes a first DMRS group, wherein in case that the number of the DMRS group is 2, the set of the DMRS group includes the first DMRS group and a second DMRS group, and wherein in case that the number of the DMRS group is 3, the set of the DMRS group includes the first DMRS group, the second DMRS group, and a third DMRS group. ### Claim 3 (depends on 1) The method of claim 1, wherein, based on the DMRS configuration information corresponding to a second value, the set of the DMRS group comprises the allocated DMRS antenna port without the at least one DMRS antenna port that is not allocated to the terminal. ### Claim 4 (depends on 1) The method of claim 1, wherein one DMRS group comprises up to 4 DMRS antenna ports multiplexed by using orthogonal code sequences. ### Claim 5 (depends on 1) The method of claim 1, wherein the set of the DMRS group is identified as containing at least one potential DMRS antenna ports for co-scheduled terminal. ### Claim 6 A method performed by a base station in a mobile communication system, the method comprising: transmitting, to a terminal, downlink scheduling information for downlink data on a physical downlink control channel, wherein the downlink scheduling information includes demodulation reference signal (DMRS) configuration information indicating a number of a DMRS group and at least one DMRS antenna port allocated to the terminal, and wherein a set of the DMRS group corresponding to the number of the DMRS group comprises one or more DMRS groups that are predefined, and each DMRS group corresponds to a plurality of DMRS antenna ports; and transmitting, to the terminal, the downlink data and a DMRS associated with the at least one allocated DMRS antenna port, wherein resources for the one or more DMRS groups are not used for carrying the downlink data, and wherein based on the DMRS configuration information corresponding to a first value, the set of the DMRS group comprises the at least one allocated DMRS antenna port indicated by the DMRS configuration information and at least one DMRS antenna port that is not allocated to the terminal. ### Claim 7 (depends on 6) The method of claim 6, wherein in case that the number of the DMRS group is 1, the set of the DMRS group includes a first DMRS group, wherein in case that the number of the DMRS group is 2, the set of the DMRS group includes the first DMRS group and a second DMRS group, and wherein in case that the number of the DMRS group is 3, the set of the DMRS group includes the first DMRS group, the second DMRS group, and a third DMRS group. ### Claim 8 (depends on 6) The method of claim 6, wherein, based on the DMRS configuration information corresponding to a second value, the set of the DMRS group comprises the allocated DMRS antenna port without the at least one DMRS antenna port that is not allocated to the terminal. ### Claim 9 (depends on 6) The method of claim 6, wherein one DMRS group comprises up to 4 DMRS antenna ports multiplexed by using orthogonal code sequences. ### Claim 10 (depends on 6) The method of claim 6, wherein the set of the DMRS group is identified as containing at least one potential DMRS antenna ports for co-scheduled terminal. ### Claim 11 A terminal in a mobile communication system, the terminal comprising: a transceiver; and a controller coupled with the transceiver and configured to: receive, from a base station, downlink scheduling information for downlink data on a physical downlink control channel, wherein the downlink scheduling information includes demodulation reference signal (DMRS) configuration information indicating a number of a DMRS group and at least one DMRS antenna port allocated to the terminal, and wherein a set of the DMRS group corresponding to the number of the DMRS group comprises one or more DMRS groups that are predefined, and each DMRS group corresponds to a plurality of DMRS antenna ports, and receive, from the base station, the downlink data and a DMRS associated with the at least one allocated DMRS antenna port, wherein resources for the one or more DMRS groups are not used for carrying the downlink data, and wherein, based on the DMRS configuration information corresponding to a first value, the set of the DMRS group comprises the at least one allocated DMRS antenna port indicated by the DMRS configuration information and at least one DMRS antenna port that is not allocated to the terminal. ### Claim 12 (depends on 11) The terminal of claim 11, wherein in case that the number of the DMRS group is 1, the set of the DMRS group includes a first DMRS group, wherein in case that the number of the DMRS group is 2, the set of the DMRS group includes the first DMRS group and a second DMRS group, and wherein in case that the number of the DMRS group is 3, the set of the DMRS group includes the first DMRS group, the second DMRS group, and a third DMRS group. ### Claim 13 (depends on 11) The terminal of claim 11, wherein, based on the DMRS configuration information corresponding to a second value, the set of the DMRS group comprises the allocated DMRS antenna port without the at least one DMRS antenna port that is not allocated to the terminal. ### Claim 14 (depends on 11) The terminal of claim 11, wherein one DMRS group comprises up to 4 DMRS antenna ports multiplexed by using orthogonal code sequences. ### Claim 15 (depends on 11) The terminal of claim 11, wherein the set of the DMRS group is identified as containing at least one potential DMRS antenna ports for co-scheduled terminal. ### Claim 16 A base station in a mobile communication system, the base station comprising: a transceiver; and a controller coupled with the transceiver and configured to: transmit, to a terminal, downlink scheduling information for downlink data on a physical downlink control channel, wherein the downlink scheduling information includes demodulation reference signal (DMRS) configuration information indicating a number of a DMRS group and at least one DMRS antenna port allocated to the terminal, and wherein a set of the DMRS group corresponding to the number of the DMRS group comprises one or more DMRS groups that are predefined, and each DMRS group corresponds to a plurality of DMRS antenna ports, and transmit, to the terminal, the downlink data and a DMRS associated with the at least one allocated DMRS antenna port, wherein resources for the one or more DMRS groups are not used for carrying the downlink data, and wherein, based on the DMRS configuration information corresponding to a first value, the set of the DMRS group comprises the at least one allocated DMRS antenna port indicated by the DMRS configuration information and at least one DMRS antenna port that is not allocated to the terminal. ### Claim 17 (depends on 16) The base station of claim 16, wherein in case that the number of the DMRS group is 1, the set of the DMRS group includes a first DMRS group, wherein in case that the number of the DMRS group is 2, the set of the DMRS group includes the first DMRS group and a second DMRS group, and wherein in case that the number of the DMRS group is 3, the set of the DMRS group includes the first DMRS group, the second DMRS group, and a third DMRS group. ### Claim 18 (depends on 16) The base station of claim 16, wherein, based on the DMRS configuration information corresponding to a second value, the set of the DMRS group comprises the allocated DMRS antenna port without the at least one DMRS antenna port that is not allocated to the terminal. ### Claim 19 (depends on 16) The base station of claim 16, wherein one DMRS group comprises up to 4 DMRS antenna ports multiplexed by using orthogonal code sequences. ### Claim 20 (depends on 16) The base station of claim 16, wherein the set of the DMRS group is identified as containing at least one potential DMRS antenna ports for co-scheduled terminal.