# US 2017/0257239 A1 · Method of demodulating control channel and data channel in wireless communciation 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 2017/0257239 A1 - Document ID: US20170257239A1 - Status: Published application - Kind: A1 - Application number: 15/448,448 - Filed: 2017-03-02 - Published: 2017-09-07 - Earliest claimed: 2016-03-02 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Sangrim LEE; Hojae LEE; Dongkyu KIM; Kwangseok NOH - Web page: https://patentgrep.com/patent/US20170257239A1 ## CPC - H04L 25/0204: {of multiple channels} - H04L 25/0228: {with direct estimation from sounding signals} - H04W 52/04: Transmission power control [TPC] - 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 25/0226: {sounding signals per se} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method of demodulating a channel by a user equipment in a wireless communication system, include the steps of receiving information including a total power value of reference signals (RSs), a power difference value between power of a first RS for control information and a power of a second RS for data among the RSs, a port number of an additional RS, a cyclic shift (CS) value of the additional RS, and a power value of the additional RS and a power difference value between second RSs for the control information, performing channel estimation on a first channel on which the additional RS is received and a second channel received from a port identical to the port number of the additional RS and the second channel on which the first RS to which a CS value different from the CS value of the additional RS is applied is received, obtaining a power difference value between the power of the additional RS and the power of the first RS based on the channel estimation of the first and the second channels, and determining a number of rank of the second RS based on the total power value of the RSs, the power value of the additional RS, a power difference value between the power of the first RS and the power of the second RS, the obtained power difference value between the power of the additional RS and the power of the first RS, and the power difference value between the power of the second RSs. ## Claims ### Claim 1 A method for demodulating a channel by a user equipment in a wireless communication system, the method comprising: receiving, from an eNode B (eNB), information containing a total power value of reference signals (RSs), a power difference value between a power of a first RS reference signal for control information and a power of a second RS for data among the RSs, a port number of an additional RS, a cyclic shift (CS) value of the additional RS, a power value of the additional RS and a power difference value between second RSs for the control information; performing channel estimation on a first channel on which the additional RS is received and a second channel received from a port identical to the port number of the additional RS and on which the first RS to which a CS value different from the CS value of the additional RS is applied is received; obtaining a power difference value between the power of the additional RS and the power of the first RS based on the channel estimation of the first and the second channels; and determining a number of rank of the second RS based on the total power value of the RSs, the power value of the additional RS, the power difference value between the power of the first RS and the power of second RS, the obtained power difference value between the power of the additional RS and the power of the first RS, and the power difference value between the second RSs. ### Claim 2 (depends on 1) The method of claim 1, wherein the determining step further comprises the steps of: determining a remaining power value by subtracting the power value of the additional RS from the total power of the RSs; and determining the number of rank of the second RS using the remaining power value, the power difference value between the power of the first RS and the power of the second RS, the obtained power difference value between the power of the additional RS and the power of the first RS, and the power difference value between the second RS. ### Claim 3 (depends on 1) The method of claim 1, further comprising: demodulating a control channel and a data channel based on the determined number of rank of the second RS. ### Claim 4 (depends on 1) The method of claim 1, wherein if the determined number of rank of the second RS corresponds to a plural number, CS values applied to the second RSs are different from each other. ### Claim 5 (depends on 1) The method of claim 1, wherein the first RS and the second RS are received through a control channel. ### Claim 6 (depends on 1) The method of claim 1, wherein the information further comprises information regarding a number of rank of the first RS, and wherein the number of rank of the second reference signal is determined further based on the information regarding the number of rank of the first RS. ### Claim 7 (depends on 1) The method of claim 1, wherein the information is configured per frequency band. ### Claim 8 (depends on 7) The method of claim 7, wherein the frequency band corresponds to a frequency band of an resource block (RB) unit or a subband unit. ### Claim 9 (depends on 1) The method of claim 1, wherein the information is configured per subframe. ### Claim 10 A user equipment for modulating a channel in a wireless communication system, the user equipment comprising: a receiver configured to receive, from an eNode B (eNB), information containing a total power value of reference signals (RSs), a power difference value between power of a first RS for control information and a power of a second RS for data among the RSs, a port number of an additional RS, a cyclic shift (CS) value of the additional RS and a power value of the additional RS, and a power difference value between second RSs for the control information; and a processor configured to: perform channel estimation on a first channel on which the additional RS is received and a second channel received from a port identical to the port number of the additional RS and the second channel on which the first RS to which a CS value different from the CS value of the additional RS is applied is received, obtain a power difference value between the power of the additional RS and the power of the first RS based on the channel estimation of the first and the second channels; and determine a number of rank of the second RS based on the total power value of the RSs, the power value of the additional RS, the power difference value between the power of the first RS and the power of second RS, the obtained power difference value between the power of the additional RS and the power of the first RS, and the power difference value between the second RSs. ### Claim 11 (depends on 10) The user equipment of claim 10, wherein the processor is further configured to: determine a remaining power value by subtracting the power value of the additional RS from the total power of the RSs; and determine a number of rank of the second RS using the remaining power value, the power difference value between the first RS and the second RS, the obtained power difference value between the power of the additional RS and the power of the first RS, and the power difference value between second RSs. ### Claim 12 (depends on 10) The user equipment of claim 10, wherein the processor is configured to demodulate a control channel and a data channel based on the determined number of rank of the second RS. ### Claim 13 (depends on 10) The user equipment of claim 10, wherein if the determined number of rank of the second RS corresponds to a plural number, CS values applied to the second RSs are different from each other. ### Claim 14 (depends on 10) The user equipment of claim 10, wherein the receiver is configured to receive the first RS and the second RS through a control channel. ### Claim 15 (depends on 10) The user equipment of claim 10, wherein the information further comprises information regarding a number of rank of the first RS and wherein the processor is configured to determine the number of rank of the second RS further based on the information regarding the number of rank of the first RS. ### Claim 16 (depends on 10) The user equipment of claim 10, wherein the information is configured per a frequency band. ### Claim 17 (depends on 16) The user equipment of claim 16, wherein the frequency band corresponds to a frequency band of a resource block (RB) unit or a subband unit. ### Claim 18 (depends on 10) The user equipment of claim 10, wherein the information is configured per subframe.