# US 2017/0288743 A1 · Method and apparatus for transmitting and receiving reference signals in wireless communication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288743 A1 - Document ID: US20170288743A1 - Status: Published application - Kind: A1 - Application number: 15/472,212 - Filed: 2017-03-28 - Published: 2017-10-05 - Earliest claimed: 2016-03-31 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd - Inventors: Young-Han Nam; Boon Loong Ng; Yang Li; Sudhir Ramakrishna; Md. Saifur Rahman - Web page: https://patentgrep.com/patent/US20170288743A1 ## CPC - H04B 7/024: Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems - H04B 7/0617: {for beam forming} - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04L 5/0023: {Time-frequency-space} - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/006: {Quality of the received signal, e.g. BER, SNR, water filling} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A base station includes a controller configured to configure an MRS resource set comprising a group of MRS resources, each MRS resource comprising a set of MRS antenna ports. If at least two MRS antenna ports belong to a same MRS resource, then the at least two MRS antenna ports are quasi co-located with respect to a first set of QCL parameters, else if the at least two MRS antenna ports belong to a same MRS resource set, then the at least two MRS antenna ports are quasi co-located with respect to a second set of QCL parameters, and else the at least two MRS antenna ports are not quasi co-located with respect to either the first set or the second set of QCL parameters. The MRS is a CSI-RS for estimating a CSI and at least one of the first set and the second set of QCL parameters. ## Claims ### Claim 1 A base station comprising: a controller configured to configure a measurement reference signal (MRS) resource set comprising a group of MRS resources, each MRS resource comprising a set of respective MRS antenna ports, wherein: if at least two MRS antenna ports belong to a same MRS resource, then the at least two MRS antenna ports are quasi co-located with respect to a first set of quasi co-located large scale channel parameters (QCL parameters); else if the at least two MRS antenna ports belong to a same MRS resource set, then the at least two MRS antenna ports are quasi co-located with respect to a second set of QCL parameters; and else the at least two MRS antenna ports are not quasi co-located with respect to either the first set or the second set of QCL parameters unless indicated otherwise; a transceiver configured to transmit the MRS resource set to a user equipment, wherein an MRS is a channel state information reference signal (CSI-RS) for estimating a CSI and at least one of the first set of QCL parameters and the second set of QCL parameters. ### Claim 2 (depends on 1) The base station of claim 1, wherein the first set of QCL parameters comprise a delay spread, a Doppler spread, a Doppler shift, an average gain, and an average delay, and the second set of QCL parameters comprise a Doppler spread and a Doppler shift. ### Claim 3 (depends on 1) The base station of claim 1, wherein a cell-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the first set of QCL parameters, and a UE-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the second set of QCL parameters, wherein the cell-specific MRS is a cell-specific CSI-RS for estimating the first set of QCL parameters, wherein the UE-specific MRS is a UE-specific CSI RS for the second set of QCL parameters. ### Claim 4 (depends on 1) The base station of claim 1, wherein a cell-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the second set of QCL parameters, and a UE-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the first set of QCL parameters, wherein the cell-specific MRS is a cell-specific CSI-RS for estimating the second set of QCL parameters, wherein the UE-specific MRS is a UE-specific CSI-RS for estimating the first set of QCL parameters. ### Claim 5 (depends on 1) The base station of claim 1, wherein when the second set of QCL parameters is different for a different set of a UE-specific MRS, the second set of QCL parameters is dynamically changed according to a downlink control information (DCI) signaling. ### Claim 6 (depends on 1) The base station of claim 1, wherein the base station configures an MRS resource to the UE, the MRS resource comprising a number of antenna ports, an MRS pattern for an MRS and a set of QCL parameters. ### Claim 7 A user equipment (UE) comprising: a transceiver configured to receive a measurement reference signal (MRS) resource set comprising a group of MRS resources from a base station, each MRS resource comprising a set of respective MRS antenna ports, wherein: if at least two MRS antenna ports belong to a same MRS resource, then the at least two MRS antenna ports are quasi co-located with respect to a first set of quasi co-located large scale channel parameters (QCL parameters); else if the at least two MRS antenna ports belong to a same MRS resource set, then the at least two MRS antenna ports are quasi co-located with respect to a second set of QCL parameters; and else the at least two MRS antenna ports are not quasi co-located with respect to either the first set or the second set of QCL parameters unless indicated otherwise; and a controller configured to be configured with the measurement reference signal (MRS) resource set, wherein an MRS is a channel state information reference signal (CSI-RS) for estimating a CSI and at least one of the first set of QCL parameters and the second set of QCL parameters. ### Claim 8 (depends on 7) The UE of claim 7, wherein the first set of QCL parameters comprise a delay spread, a Doppler spread, a Doppler shift, an average gain, and an average delay, and the second set of QCL parameters comprise a Doppler spread and a Doppler shift. ### Claim 9 (depends on 7) The UE of claim 7, wherein a cell-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the first set of QCL parameters, and a UE-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the second set of QCL parameters, wherein the cell-specific MRS is a cell-specific CSI-RS for estimating the first set of QCL parameters, wherein the UE-specific MRS is a UE-specific CSI RS for the second set of QCL parameters. ### Claim 10 (depends on 7) The UE of claim 7, wherein a cell-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the second set of QCL parameters, and a UE-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the first set of QCL parameters, wherein the cell-specific MRS is a cell-specific CSI-RS for estimating the second set of QCL parameters, wherein the UE-specific MRS is a UE-specific CSI-RS for estimating the first set of QCL parameters. ### Claim 11 (depends on 7) The UE of claim 7, wherein when the second set of QCL parameters is different for a different set of a UE-specific MRS, the second set of QCL parameters is dynamically changed according to a downlink control information (DCI) signaling. ### Claim 12 (depends on 7) The UE of claim 7, wherein the base station configures an MRS resource to the UE, the MRS resource comprising a number of antenna ports, an MRS pattern for an MRS and a set of QCL parameters. ### Claim 13 A method for operating a base station, the method comprising: configuring a measurement reference signal (MRS) resource set comprising a group of MRS resources, each MRS resource comprising a set of respective MRS antenna ports, wherein: if at least two MRS antenna ports belong to a same MRS resource, then the at least two MRS antenna ports are quasi co-located with respect to a first set of quasi co-located large scale channel parameters (QCL parameters); else if the at least two MRS antenna ports belong to a same MRS resource set, then the at least two MRS antenna ports are quasi co-located with respect to a second set of QCL parameters; and else the at least two MRS antenna ports are not quasi co-located with respect to either the first set or the second set of QCL parameters unless indicated otherwise; and transmitting the MRS resource set to a user equipment, wherein an MRS is a channel state information reference signal (CSI-RS) for estimating a CSI and at least one of the first set of QCL parameters and the second set of QCL parameters. ### Claim 14 (depends on 13) The method of claim 13, wherein the first set of QCL parameters comprise a delay spread, a Doppler spread, a Doppler shift, an average gain, and an average delay, and the second set of QCL parameters comprise a Doppler spread and a Doppler shift. ### Claim 15 (depends on 13) The method of claim 13, wherein a cell-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the first set of QCL parameters, and a UE-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the second set of QCL parameters, wherein the cell-specific MRS is a cell-specific CSI-RS for estimating the first set of QCL parameters, wherein the UE-specific MRS is a UE-specific CSI RS for the second set of QCL parameters. ### Claim 16 (depends on 13) The method of claim 13, wherein a cell-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the second set of QCL parameters, and a UE-specific MRS port is quasi co-located with a PDSCH DM-RS port with respect to the first set of QCL parameters, wherein the cell-specific MRS is a cell-specific CSI-RS for estimating the second set of QCL parameters, wherein the UE-specific MRS is a UE-specific CSI-RS for estimating the first set of QCL parameters. ### Claim 17 (depends on 13) The method of claim 13, wherein when the second set of QCL parameters is different for a different set of a UE-specific MRS, the second set of QCL parameters is dynamically changed according to a downlink control information (DCI) signaling. ### Claim 18 (depends on 13) The method of claim 13, wherein the base station configures an MRS resource to the UE, the MRS resource comprising a number of antenna ports, an MRS pattern for an MRS and a set of QCL parameters. ### Claim 19 A base station comprising: a transceiver configured to transmit Physical Uplink Shared Channel (PUSCH) transmission parameters to a user equipment (UE); and a controller configured to configure the PUSCH transmission parameters including a cyclic shift, a orthogonal cover code (OCC) and comb offset parameters O(λ)(0) and O(λ)(1), wherein for up-to eight UE multi user (MU) multi-input multi-output (MIMO) with one layer per UE, the comb offset parameters O(λ)(0) and O(λ)(1) are determined according to a following table: Cyclic Shift Field in uplink-related downlink control information (DCI) format [O(λ)(0) O(λ)(1)] 000 [0 0] 001 [0 0] 010 [0 0] 011 [1 1] 100 [1 1] 101 [1 1] 110 [1 1] 111 [0 0] ### Claim 20 A user equipment (UE) comprising: a transceiver configured to receive Physical Uplink Shared Channel (PUSCH) transmission parameters; and a controller configured to generate a Demodulation reference signal (DMRS) sequence using uplink PUSCH transmission parameters, wherein the uplink PUSCH transmission parameters includes a cyclic shift, a orthogonal cover code (OCC) and comb offset parameters O(λ)(0) and O(λ)(1), wherein for up-to eight UE multi user (MU) multi-input multi-output with one layer per UE, the comb offset parameters O(λ)(0) and O(λ)(1) are determined according to a following table: Cyclic Shift Field in up-related downlink control information (DCI) format [O(λ)(0) O(λ)(1)] 000 [0 0] 001 [0 0] 010 [0 0] 011 [1 1] 100 [1 1] 101 [1 1] 110 [1 1] 111 [0 0]