# US 10,374,837 B2 · Method for measuring effective channel for must transmission in wireless communication system and apparatus therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,837 B2 - Document ID: US10374837B2 - Status: Granted - Kind: B2 - Application number: 15/737,971 - Filed: 2016-07-06 - Published: 2018-11-15 - Granted: 2019-08-06 - Earliest claimed: 2015-07-07 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Hyungtae Kim; Kijun Kim - Web page: https://patentgrep.com/patent/US10374837B2 ## CPC - H04L 25/0204: {of multiple channels} - H04B 7/0452: Multi-user MIMO systems - H04B 7/0486: {taking channel rank into account} - H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} - H04L 5/003: {Arrangements for allocating sub-channels of the transmission path} - 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 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 25/02: Details {; arrangements for supplying electrical power along data transmission lines (systems for transmitting signals via power distribution lines H04B3/54)} - H04L 25/0224: {using sounding signals} - H04L 25/03343: {Arrangements at the transmitter end} - H04L 25/03898: {codebook-based design (selection of codebook or precoding matrix for MIMO diversity systems H04B7/0456)} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 76/27: Transitions between radio resource control [RRC] states - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Disclosed is a method for estimating a channel by a first terminal in a wireless communication system. Particularly, the method comprises the steps of: obtaining information associated with whether a first pre-coder for the first terminal and a second pre-coder for a second terminal are identical to each other; estimating, as a single effective channel, a first effective channel between a base station and the first terminal and a second effective channel between the base station and the second terminal when the first pre-coder and the second pre-coder are identical to each other; individually estimating the first effective channel and the second effective channel when the first pre-coder and the second pre-coder are different from each other. ## Claims ### Claim 1 A method for estimating a channel by a first user equipment (UE) in a wireless communication system, the method comprising: obtaining information on whether a first precoder for the first UE is identical to a second precoder for a second UE; when the first precoder is identical to the second precoder, estimating a first effective channel between an evolved node B (eNB) and the first UE and a second effective channel between the eNB and the second UE as a single effective channel; and when the first precoder is not identical to the second precoder, separately estimating the first effective channel and the second effective channel. ### Claim 2 (depends on 1) The method of claim 1, wherein estimating the first and second effective channels as the single effective channel comprises: obtaining information on a first reference signal for the first UE and information on a second reference signal for the second UE; and estimating the single effective channel using the first and second reference signals. ### Claim 3 (depends on 1) The method of claim 1, wherein the information on whether the first precoder is identical to the second precoder is received from the eNB. ### Claim 4 (depends on 1) The method of claim 1, wherein obtaining the information on whether the first precoder is identical to the second precoder comprises: obtaining information on a first reference signal for the first UE and information on a second reference signal for the second UE; and when the same parameters are configured for the first and second reference signals, determining that the first precoder is identical to the second precoder. ### Claim 5 (depends on 1) The method of claim 1, wherein a signal for the first UE and a signal for the second UE are transmitted using the same time and frequency resources. ### Claim 6 (depends on 5) The method of claim 5, wherein the first UE is located near to the eNB, and wherein the second UE is located far from the eNB. ### Claim 7 A user equipment (UE) in a wireless communication system, the UE comprising: a wireless communication module for transmitting and receiving signals to and from an evolved node B (eNB); and a processor for processing the signals, wherein the processor is configured to obtain information on whether a first precoder for the UE is identical to a second precoder for a different UE, estimate a first effective channel between the eNB and the UE and a second effective channel between the eNB and the different UE as a single effective channel when the first precoder is identical to the second precoder, and separately estimate the first effective channel and the second effective channel when the first precoder is not identical to the second precoder. ### Claim 8 (depends on 7) The UE of claim 7, wherein the processor is configured to obtain information on a first reference signal for the UE and information on a second reference signal for the different UE and estimate the single effective channel using the first and second reference signals. ### Claim 9 (depends on 7) The UE of claim 7, wherein the information on whether the first precoder is identical to the second precoder is received from the eNB. ### Claim 10 (depends on 7) The UE of claim 7, wherein the processor is configured to obtain information on a first reference signal for the UE and information on a second reference signal for the different UE and determine that the first precoder is identical to the second precoder when the same parameters are configured for the first and second reference signals. ### Claim 11 (depends on 7) The UE of claim 7, wherein a signal for the UE and a signal for the different UE are transmitted using the same time and frequency resources. ### Claim 12 (depends on 11) The UE of claim 11, wherein the UE is located near to the eNB, and wherein the different UE is located far from the eNB.