# US 10,312,986 B2 · Flexible CSI RS configuration for FD-MIMO systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,312,986 B2 - Document ID: US10312986B2 - Status: Granted - Kind: B2 - Application number: 15/753,960 - Filed: 2015-12-24 - Published: 2018-08-02 - Granted: 2019-06-04 - Earliest claimed: 2015-08-19 - Assignees: Intel Corporation - Applicants: Intel Corporation - Inventors: Alexei Vladimirovich Davydov; Alexander Alexandrovich Maltsev; Gregory Vladimirovich Morozov - Web page: https://patentgrep.com/patent/US10312986B2 ## CPC - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - 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 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04B 7/10: Polarisation diversity; Directional diversity - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Described are an eNB and a UE implementing a CSI-RS protocol. The eNB has an ordered set of antenna ports for a wireless communication channel with the UE, a first circuitry operable to compose CSI-RS configuration messages that assign to the UE various CSI-RS groups specifying one or more CSI-RS antenna ports, and a second circuitry to establish an ordered list of CSI-RS antenna ports. The UE has a set of antennas, a first circuitry operable to receive from the eNB various CSI-RS configuration messages assigning to it CSI-RS groups specifying one or more CSI-RS antenna ports, and a second circuitry operable to index CSI-RS antenna ports specified by the CSI-RS groups as an ordered list of CSI-RS antenna ports. The eNB may transmit CSI-RS to the configured UE, and the UE may perform channel state information measurements on the ordered list of CSI-RS antenna ports. ## Claims ### Claim 1 An apparatus of a User Equipment (UE) comprising an application processor, a memory, a set of antennas, and a wireless interface for allowing the application processor to communicate with another device, wherein the apparatus includes: a first circuitry operable to receive Channel State Information Reference Signal (CSI-RS) configuration messages from an eNB that assign to the UE a CSI-RS group specifying one or more CSI-RS antenna ports; and a second circuitry operable to index a first set of CSI-RS antenna ports specified by a first assigned CSI-RS group and a second set of CSI-RS antenna ports specified by a second assigned CSI-RS group as an ordered list of CSI-RS antenna ports for at least part of a channel associated with the set of antennas, wherein the second circuitry is operable to index the ordered list of CSI RS antenna ports beginning with a first portion of the antenna ports specified by the first assigned CSI RS group and a first portion of the antenna ports specified by the second assigned CSI RS group, followed by a second portion of the antenna ports specified by the first assigned CSI RS group and a second portion of the antenna ports specified by the second assigned CSI RS group. ### Claim 2 (depends on 1) The apparatus of the UE of claim 1, wherein the second circuitry is operable to perform channel state information measurements on the ordered list of CSI-RS antenna ports, wherein the first assigned CSI-RS group corresponds with a CSI-RS configuration having 2, 4, or 8 antenna ports as defined in TS 36.211 v. 10.7.0, and wherein CSI-RS symbols for the ordered list of CSI-RS antenna ports are transmitted in the same downlink subframe. ### Claim 3 (depends on 2) The apparatus of the UE of claim 2, wherein the second circuitry is operable to calculate channel state information based on the channel state information measurements. ### Claim 4 (depends on 3) The apparatus of the UE of claim 3, wherein the first circuitry is operable to compose a reporting message to the eNB containing the calculated channel state information. ### Claim 5 (depends on 1) The apparatus of the UE of claim 1, wherein the second circuitry is operable to index the ordered list of CSI-RS antenna ports beginning with all antenna ports specified by the first assigned CSI-RS group, then all antenna ports specified by the second assigned CSI-RS group. ### Claim 6 (depends on 1) The apparatus of the UE of claim 1, wherein the first portion of the antenna ports is a first half of the antenna ports, and wherein the second portion of the antenna ports is a second half of the antenna ports. ### Claim 7 (depends on 1) The apparatus of the UE of claim 1, wherein the first assigned CSI-RS group and the second assigned CSI-RS group are contained in one message from the eNB having an information element (IE) that specifies each CSI-RS group as at least one asserted bit in an array of bits. ### Claim 8 (depends on 1) The apparatus of the UE of claim 1, wherein the apparatus is a baseband circuitry of the UE. ### Claim 9 An Evolved Node-B (eNB) operable to communicate with a User Equipment (UE) on a network, the eNB including hardware processing circuitry comprising: an ordered set of antenna ports for at least part of a channel associated with a set of receiving antennas of the UE; a first circuitry operable to compose CSI-RS configuration messages that assign to the UE a Channel State Information Reference Signal (CSI-RS) group specifying one or more CSI-RS antenna ports; and a second circuitry operable to establish CSI-RS group assignments for an ordered list of CSI-RS antenna ports corresponding with the ordered set of antenna ports of the eNB, the ordered list of CSI-RS antenna ports including one or more antenna ports specified by a first assigned CSI-RS group, and including one or more antenna ports specified by a second assigned CSI-RS group; wherein the second circuitry is operable to establish the one or more antenna ports specified by the first assigned CSI-RS group as being associated with a first antenna coupled to the eNB, and to establish the one or more antenna ports specified by the second assigned CSI-RS group as being associated with a second antenna coupled to the eNB, the first antenna and second antenna having orthogonal polarizations. ### Claim 10 (depends on 9) The eNB of claim 9, wherein the first circuitry is operable to receive a reporting message from the UE containing calculated channel state information for the channel based on channel state information measurements on the ordered list of CSI-RS antenna ports. ### Claim 11 (depends on 9) The eNB of claim 9, wherein the second circuitry is operable to establish the one or more antenna ports specified by the first assigned CSI-RS group as being associated with a first portion of the ordered set of antenna ports of the eNB, and to establish the one or more antenna ports specified by the second assigned CSI-RS group as being associated with a second portion of the ordered set of antenna ports of the eNB, the second portion following the first portion in the ordered set of antenna ports of the eNB. ### Claim 12 (depends on 11) The eNB of claim 11, wherein the first portion of the antenna ports is a first half of the antenna ports, and wherein the second portion of the antenna ports is a second half of the antenna ports. ### Claim 13 (depends on 9) The eNB of claim 9, wherein the second circuitry is operable to establish a first antenna port specified by the first assigned CSI-RS group and a first antenna port specified by the second assigned CSI-RS group as being associated with a first portion of the ordered set of antenna ports of the eNB, and to establish a second antenna port specified by the first assigned CSI-RS group and a second antenna port specified by the second assigned CSI-RS group as being associated with a second portion of the ordered set of antenna ports of the eNB, the second portion following the first portion in the ordered set of antenna ports of the eNB. ### Claim 14 (depends on 9) The eNB of claim 9, wherein the first assigned CSI-RS group and the second assigned CSI-RS group are contained in one message to the UE having an information element (IE) that specifies each CSI-RS group as at least one asserted bit in an array of bits. ### Claim 15 (depends on 9) The eNB of claim 9, wherein the first assigned CSI-RS group is transmitted in a first message to the UE and the second assigned CSI-RS group is transmitted in a second message to the UE. ### Claim 16 Non-transitory machine readable storage media having machine executable instructions stored thereon that, when executed, cause a User Equipment (UE) to perform an operation comprising: receive in the UE, from an Evolved Node-B (eNB), an assignment of a first Channel State Information Reference Signal (CSI-RS) group specifying one or more CSI-RS antenna ports, and an assignment of a second CSI-RS group specifying one or more CSI-RS antenna ports; and index the one or more antenna ports specified by the first CSI-RS group assignment and the one or more antenna ports specified by the second CSI-RS group assignment as an ordered list of CSI-RS antenna ports for at least part of a channel associated with a set of receiving antennas of the UE, wherein the indexing interleaves the one or more REs of the first CSI-RS group assignment with the one or more REs of the second CSI-RS group assignment. ### Claim 17 (depends on 16) The machine readable storage media of claim 16, wherein the indexing begins with all antenna ports specified by the first CSI-RS group assignment, then all antenna ports specified by the second CSI-RS group assignment. ### Claim 18 (depends on 16) The machine readable storage media of claim 16, wherein the first CSI-RS group assignment and the second CSI-RS group assignment are contained in one message from the eNB having an information element (IE) that specifies each CSI-RS group assignment as at least one asserted bit in an array of bits. ### Claim 19 Non-transitory machine readable storage media having machine executable instructions stored thereon that, when executed, cause an Evolved Node-B (eNB) to perform an operation comprising: establish one or more Channel State Information Reference Signal (CSI-RS) antenna ports specified by a first CSI-RS group assignment and one or more CSI-RS antenna ports specified by a second CSI-RS group assignment as being an ordered set of antenna ports of the eNB for at least part of a channel associated with a set of receiving antennas for a User Equipment (UE); transmit to the UE the first CSI-RS group assignment and the second CSI-RS group assignment; associate a first antenna coupled to the eNB with the one or more antenna ports specified by the first CSI-RS group assignment; and associate a second antenna coupled to the eNB with the one or more antenna ports specified by the second CSI-RS group assignment, the first antenna and the second antenna having orthogonal polarizations. ### Claim 20 (depends on 19) The machine readable storage media of claim 19, having machine executable instructions stored thereon that, when executed, cause the eNB to perform an operation comprising: associate a first portion of the ordered set of antenna ports of the eNB with one or more antenna ports specified by the first CSI-RS group assignment; and associate a second portion of the ordered set of antenna ports of the eNB with one or more antenna ports specified by the second CSI-RS group assignment, the second portion following the first portion in the ordered set of antenna ports of the eNB. ### Claim 21 (depends on 19) The machine readable storage media of claim 19, having machine executable instructions stored thereon that, when executed, cause the eNB to perform an operation comprising: associate a first antenna port specified by the first CSI-RS group assignment and a first antenna port specified by the second CSI-RS group assignment with a first portion of the ordered set of antenna ports of the eNB; and associate a second antenna port specified by the first CSI-RS group assignment and a second antenna port specified by the second CSI-RS group assignment with a second portion of the ordered set of antenna ports of the eNB, the second portion following the first portion in the ordered set of antenna ports of the eNB.