# US 10,455,566 B2 · Methods 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 10,455,566 B2 - Document ID: US10455566B2 - Status: Granted - Kind: B2 - Application number: 15/589,371 - Filed: 2017-05-08 - Published: 2017-08-24 - Granted: 2019-10-22 - 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/US10455566B2 ## 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 of a terminal in a mobile communication system, the method comprising: receiving, from a base station, demodulation configuration information indicating first information on a number of a demodulation reference signal (DMRS) group and second information on at least one DMRS antenna port allocated to the terminal on a physical downlink control channel (PDCCH), the demodulation configuration information being obtained by joint-encoding of the first information and the second information; identifying a resource for downlink data by excluding a resource of at least one DMRS group indicated by the first information; and receiving, from the base station, the downlink data on the identified resource and a DMRS associated with the at least one antenna port based on the second information, wherein a plurality of antenna ports are allocated to a resource of one DMRS group using an orthogonal code. ### Claim 2 (depends on 1) The method of claim 1, wherein the at least one antenna port indicated by the second information is included in the at least one DMRS group indicated by the first information. ### Claim 3 (depends on 1) The method of claim 1, wherein patterns of a plurality of DMRS groups are frequency division multiplexed. ### Claim 4 (depends on 1) The method of claim 1, further comprising: receiving, from base station, information on a number of resource a DMRS based on a predefined configuration before a reception of a dedicated DMRS configuration for the terminal. ### Claim 5 (depends on 1) The method of claim 1, wherein the at least one DMRS group indicated by the first information is capable of including a DMRS of a co-scheduled terminal. ### Claim 6 A method of a base station in a mobile communication system, the method comprising: transmitting, to a terminal demodulation configuration information indicating first information on a number of a demodulation reference signal (DMRS) group and second information on at least one DMRS antenna port allocated to the terminal on a physical downlink control channel (PDCCH), the demodulation configuration information being obtained by joint-encoding of the first information and the second information; identifying a resource for downlink data by excluding a resource of at least one DMRS group indicated by the first information; and transmitting, to the terminal, the downlink data on the identified resource and a DMRS associated with the at least one antenna port based on the second information, wherein a plurality of antenna ports are allocated to a resource of one DMRS group using an orthogonal code. ### Claim 7 (depends on 6) The method of claim 6, wherein the at least one antenna port indicated by the second information is included in the at least one DMRS group indicated by the first information. ### Claim 8 (depends on 6) The method of claim 6, wherein patterns of a plurality of DMRS groups are frequency division multiplexed. ### Claim 9 (depends on 6) The method of claim 6, further comprising: transmitting, to the terminal, a DMRS based on a predefined configuration before a reception of a dedicated DMRS configuration for the terminal. ### Claim 10 (depends on 6) The method of claim 6, wherein the at least one DMRS group indicated by the first information is capable of including a DMRS of a co-scheduled terminal. ### Claim 11 A terminal in a mobile communication system, the terminal comprising: a transceiver configured to transmit and receive at least one signal; and a controller coupled to the transceiver and configured to: receive, from a base station, demodulation configuration information indicating first information on a number of a demodulation reference signal (DMRS) group and second information on at least one DMRS antenna port allocated to the terminal on a physical downlink control channel (PDCCH), the demodulation configuration information being obtained by joint-encoding of the first information and the second information, identify a resource for downlink data by excluding a resource of at least one DMRS group indicated by the first information, and receive, from the base station, the downlink data on the identified resource and a DMRS associated with the at least one antenna port based on the second information, wherein a plurality of antenna ports are allocated to a resource of one DMRS group using an orthogonal code. ### Claim 12 (depends on 11) The terminal of claim 11, wherein the at least one antenna port indicated by the second information is included in the at least one DMRS group indicated by the first information. ### Claim 13 (depends on 11) The terminal of claim 11, wherein patterns of a plurality of DMRS groups are frequency division multiplexed. ### Claim 14 (depends on 11) The terminal of claim 11, wherein the controller is further configured to receive, from the base station, a DMRS based on a predefined configuration before a reception of a dedicated DMRS configuration for the terminal. ### Claim 15 (depends on 11) The terminal of claim 11, wherein the at least one DMRS group indicated by the first information is capable of including a DMRS of a co-scheduled terminal. ### Claim 16 A base station in a mobile communication system, the base station comprising: a transceiver configured to transmit and receive at least one signal; and a controller coupled to the transceiver and configured to: transmit, to a terminal, demodulation configuration information indicating first information on a number of a demodulation reference signal (DMRS) group and second information on at least one DMRS antenna port allocated to the terminal on a physical downlink control channel (PDCCH), the demodulation configuration information being obtained by joint-encoding of the first information and the second information, identify a resource for downlink data by excluding a resource of at least one DMRS group indicated by the first information, and transmit, to the terminal, the downlink data the identified resource and a DMRS associated with the at least one antenna port based on the second information, wherein a plurality of antenna ports are allocated to a resource of one DMRS group using an orthogonal code. ### Claim 17 (depends on 16) The base station of claim 16, wherein the at least one antenna port indicated by the second information is included in the at least one DMRS group indicated by the first information. ### Claim 18 (depends on 16) The base station of claim 16, wherein patterns of a plurality of DMRS groups are frequency division multiplexed. ### Claim 19 (depends on 16) The base station of claim 16, wherein the controller is further configured to transmit to the terminal, a DMRS based on a predefined configuration before a reception of a dedicated DMRS configuration for the terminal. ### Claim 20 (depends on 16) The base station of claim 16, wherein the at least one DMRS group indicated by the first information is capable of including a DMRS of a co-scheduled terminal.