# US 8,570,852 B2 · Method of transmitting control signals in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,570,852 B2 - Document ID: US8570852B2 - Status: Granted - Kind: B2 - Application number: 13/457,987 - Filed: 2012-04-27 - Published: 2012-08-23 - Granted: 2013-10-29 - Earliest claimed: 2007-06-14 - Assignees: LG Electronics Inc. - Applicants: Jin Sam Kwak; Seung Hee Han; Min Seok Noh; Yeong Hyeon Kwon; Hyun Woo Lee; Dong Cheol Kim - Inventors: Jin Sam Kwak; Seung Hee Han; Min Seok Noh; Yeong Hyeon Kwon; Hyun Woo Lee; Dong Cheol Kim - Web page: https://patentgrep.com/patent/US8570852B2 ## CPC - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04J 11/0026: {of multi-user interference} - H04L 1/0026: {Transmission of channel quality indication} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0021: {in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA} - 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 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 5/0057: {Physical resource allocation for CQI} - H04L 5/006: {Quality of the received signal, e.g. BER, SNR, water filling} - H04L 27/20: Modulator circuits; Transmitter circuits - H04L 27/22: Demodulator circuits; Receiver circuits - H04L 27/2602: {Signal structure} - H04L 27/2605: {Symbol extensions, e.g. Zero Tail, Unique Word [UW]} - H04L 27/2613: {Structure of the reference signals} - H04L 27/262: {Reduction thereof by selection of pilot symbols} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04L 1/1671: {the supervisory signal being transmitted together with control information} - H04L 27/26035: {Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences (using different training sequence per antenna H04B7/0684; code allocation H04J13/16)} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - 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 transmitting control signals in a wireless communication system includes multiplexing a first control signal with a second control signal in a slot, the slot comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols in time domain, the plurality of OFDM symbols being divided into a plurality of data OFDM symbols and a plurality of reference signal (RS) OFDM symbols, wherein the first control signal is mapped to the plurality of data OFDM symbols after the first control signal is spread by a base sequence in the frequency domain, the RS is mapped to the plurality of RS OFDM symbols, the second control signal is mapped to at least one of the plurality of RS OFDM symbols, and transmitting the first control signal and the second control signal in the slot. ## Claims ### Claim 1 A method of transmitting control signals in a wireless communication system, wherein the method comprises: configuring, by a user equipment, an uplink control channel in a subframe, the subframe comprising two consecutive slots, each slot comprising a plurality of data orthogonal frequency division multiplexing (OFDM) symbols and first and second reference signal (RS) OFDM symbols, wherein the uplink control channel has a first mode for transmitting a channel quality indicator (CQI) signal and a second mode for transmitting both a CQI signal and an acknowledgment/non-acknowledgement (ACK/NACK) signal; in any of the first and second modes of the uplink control channel: generating a plurality of spread modulation symbols based on the CQI signal using a frequency domain sequence; and mapping the spread modulation symbols to the plurality of data OFDM symbols of the slot; in the first mode of the uplink control channel: generating two CQI RS symbols for use, by a base station, to demodulate the CQI signal; and mapping the two CQI RS symbols to the first and second RS OFDM symbols of the slot, respectively; in the second mode of the uplink control channel: generating first and second RS symbols for use, by a base station, to demodulate the CQI signal, wherein the first RS symbol is independent from the ACK/NACK signal, and the ACK/NACK signal is multiplexed into the second RS symbol; and mapping the first and second RS symbols to the first and second RS OFDM symbols of the slot, respectively; transmitting, by the user equipment, the data and RS OFDM symbols mapped according to one of the first and second modes on the uplink control channel in the subframe. ### Claim 2 (depends on 1) The method of claim 1, wherein, in the second mode of the uplink control channel, generating the second RS symbol comprises multiplying a frequency domain spreading sequence by an ACK/NACK modulation symbol obtained from the ACK/NACK signal. ### Claim 3 (depends on 1) The method of claim 1, wherein, in the second mode of the uplink control channel, the second RS symbol has one of two opposite values depending on the ACK/NACK signal having a 1 bit size. ### Claim 4 (depends on 1) The method of claim 1, wherein the number of information bits for the CQI signal is larger than the number of information bits of the ACK/NACK signal. ### Claim 5 (depends on 1) The method of claim 1, wherein each slot comprises five data OFDM symbols. ### Claim 6 (depends on 1) The method of claim 1, wherein the two RS OFDM symbols are not contiguous with each other in the slot. ### Claim 7 (depends on 6) The method of claim 6, wherein the second RS symbol is mapped to the last RS OFDM symbol in each slot. ### Claim 8 (depends on 1) The method of claim 1, wherein the CQI signal is modulated by quadrature phase shift keying (QPSK) modulation and the ACK/NACK signal is modulated by QPSK or binary phase shift keying (BPSK) modulation. ### Claim 9 A transmission equipment configured for operating in a wireless communication system and for transmitting control signals, wherein the transmission equipment comprises a transmission processor configured for: configuring an uplink control channel in a subframe, the subframe comprising two consecutive slots, each slot comprising a plurality of data orthogonal frequency division multiplexing (OFDM) symbols and first and second reference signal (RS) OFDM symbols, wherein the uplink control channel has a first mode for transmitting a channel quality indicator (CQI) signal and a second mode for transmitting both a CQI signal and an acknowledgment/non-acknowledgement (ACK/NACK) signal; in any of the first and second modes of the uplink control channel: generating a plurality of spread modulation symbols based on the CQI signal using a frequency domain sequence; and mapping the spread modulation symbols to the plurality of data OFDM symbols of the slot; in the first mode of the uplink control channel: generating two CQI RS symbols for use, by a base station, to demodulate the CQI signal; and mapping the two CQI RS symbols to the first and second RS OFDM symbols of the slot, respectively; in the second mode of the uplink control channel: generating first and second RS symbols for use, by a base station, to demodulate the CQI signal, wherein the first RS symbol is independent from the ACK/NACK signal, and the ACK/NACK signal is multiplexed into the second RS symbol; and mapping the first and second RS symbols to the first and second RS OFDM symbols of the slot, respectively; transmitting the data and RS OFDM symbols mapped according to one of the first and second modes on the uplink control channel in the subframe. ### Claim 10 (depends on 9) The transmission equipment of claim 9, wherein, in the second mode of the uplink control channel, generating the second RS symbol comprises multiplying a frequency domain spreading sequence by an ACK/NACK modulation symbol obtained from the ACK/NACK signal. ### Claim 11 (depends on 9) The transmission equipment of claim 9, wherein, in the second mode of the uplink control channel, the second RS symbol has one of two opposite values depending on the ACK/NACK signal having a 1 bit size. ### Claim 12 (depends on 9) The transmission equipment of claim 9, wherein the number of information bits for the CQI signal is larger than the number of information bits of the ACK/NACK signal. ### Claim 13 (depends on 9) The transmission equipment of claim 9, wherein each slot comprises five data OFDM symbols. ### Claim 14 (depends on 9) The transmission equipment of claim 9, wherein the two RS OFDM symbols are not contiguous with each other in the slot. ### Claim 15 (depends on 14) The transmission equipment of claim 14, wherein the second RS symbol is mapped to the last RS OFDM symbol in each slot. ### Claim 16 (depends on 9) The transmission equipment of claim 9, wherein the CQI signal is modulated by quadrature phase shift keying (QPSK) modulation and the ACK/NACK signal is modulated by QPSK or binary phase shift keying (BPSK) modulation.