# US 11,909,511 B2 · Communication apparatus and reference signal receiving method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,511 B2 - Document ID: US11909511B2 - Status: Granted - Kind: B2 - Application number: 17/660,680 - Filed: 2022-04-26 - Published: 2022-08-11 - Granted: 2024-02-20 - Earliest claimed: 2009-10-30 - Assignees: Sun Patent Trust - Applicants: Sun Patent Trust - Inventors: Takashi Iwai; Daichi Imamura; Akihiko Nishio; Yoshihiko Ogawa; Masaru Fukuoka - Web page: https://patentgrep.com/patent/US11909511B2 ## CPC - H04J 11/0053: {using co-ordinated multipoint transmission/reception (co-ordinated antenna or beam-forming aspects H04B7/022)} - H04B 1/713: using frequency hopping - 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 17/354: Adjacent channel leakage power - H04J 13/0062: {Zadoff-Chu} - H04J 13/0074: {Code shifting or hopping} - H04L 1/20: using signal quality detector - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04L 1/0026: {Transmission of channel quality indication} - 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 5/0073: {Allocation arrangements that take into account other cell interferences} - 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) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Provided are a wireless communication apparatus and a reference signal generating method, wherein inter-cell interference is reduced inside and outside a CoMP set. A CoMP mode setting unit (101) sets whether the terminal (100) thereof is a CoMP terminal or a Non-CoMP terminal. When the terminal (100) is set as a Non-CoMP terminal, the hopping pattern calculating unit (104) calculates a ZC sequence number to be used as the transmission timing, from among all the ZC sequence numbers that can be used within the system. When the terminal (100) is set as a CoMP terminal, the hopping pattern calculating unit (104) calculates a ZC sequence number to be used as the transmission timing, by hopping the ZC sequence numbers to be used within the CoMP set. A ZC sequence generating unit (105) generates a ZC sequence to be used as an SRS, using the calculated ZC sequence number. ## Claims ### Claim 1 An integrated circuit to control a process, the process comprising: transmitting, to a terminal, information related to a hopping pattern that defines a variation of sequence numbers over time; receiving, from the terminal, a reference signal generated using a sequence number, the sequence number being calculated using the hopping pattern that is defined differently by whether a CoMP (Coordinated Multiple Point transmission and reception) mode or Non-CoMP mode is set, wherein, when the CoMP mode is set, a plurality of base stations or cells communicate with the terminal in a coordinated manner between the plurality of base stations or cells; and estimating a channel quality based on the received reference signal. ### Claim 2 (depends on 1) The integrated circuit according to claim 1, comprising: circuitry which, in operation, controls the process; at least one input coupled to the circuitry, wherein the at least one input, in operation, inputs data; and at least one output coupled to the circuity, wherein the at least one output, in operation, outputs data. ### Claim 3 (depends on 1) The integrated circuit according to claim 1, wherein the sequence number is calculated by hopping a sequence number that is used in a CoMP set, the CoMP set comprising the plurality of base stations or cells performing communication in the coordinated manner, when the CoMP mode is set. ### Claim 4 (depends on 1) The integrated circuit according to claim 1, wherein the sequence number is calculated by hopping a sequence number that is not used in a CoMP set, the CoMP set comprising the plurality of base stations or cells performing communication in the coordinated manner, when the CoMP mode is set. ### Claim 5 (depends on 1) The integrated circuit according to claim 1, wherein the sequence number is calculated by hopping a sequence number that is used in CoMP sets in a cell, wherein each of the CoMP sets comprises a plurality of base stations or cells performing communication with a radio communication apparatus in the coordinated manner, when the CoMP mode is set. ### Claim 6 (depends on 1) The integrated circuit according to claim 1, wherein the sequence number is calculated by hopping a sequence number that is not used in CoMP sets in a cell, wherein each of the CoMP sets comprises a plurality of base stations or cells performing communication with a radio communication apparatus in the coordinated manner, when the CoMP mode is set. ### Claim 7 (depends on 1) The integrated circuit according to claim 1, wherein the sequence number is calculated using the hopping pattern, which is defined based on a cell identification number, when the Non-CoMP mode is set. ### Claim 8 (depends on 1) The integrated circuit according to claim 1, wherein the hopping pattern includes a first hopping pattern and a second hopping pattern different from the first hopping pattern, and the sequence number is calculated using the first hopping pattern when the CoMP mode is set, and the sequence number is calculated using the second hopping pattern when the Non-CoMP mode is set. ### Claim 9 (depends on 1) The integrated circuit according to claim 1, wherein when the CoMP mode is set, the terminal transmits a signal to a plurality of cells capable of coordinating a reconstruction of a single signal based each of the plurality of signals received by the cells. ### Claim 10 An integrated circuit comprising circuitry, which, in operation: controls transmission, to a terminal, of information related to a hopping pattern that defines a variation of sequence numbers over time; controls reception, from the terminal, of a reference signal generated using a sequence number, the sequence number being calculated using the hopping pattern that is defined differently by whether a CoMP (Coordinated Multiple Point transmission and reception) mode or Non-CoMP mode is set, wherein, when the CoMP mode is set, a plurality of base stations or cells communicate with the terminal in a coordinated manner between the plurality of base stations or cells; and estimates a channel quality based on the received reference signal. ### Claim 11 (depends on 10) The integrated circuit according to claim 10, comprising: at least one input coupled to the circuitry, wherein the at least one input, in operation, inputs data; and at least one output coupled to the circuity, wherein the at least one output, in operation, outputs data. ### Claim 12 (depends on 10) The integrated circuit according to claim 10, wherein the sequence number is calculated by hopping a sequence number that is used in a CoMP set, the CoMP set comprising the plurality of base stations or cells performing communication in the coordinated manner, when the CoMP mode is set. ### Claim 13 (depends on 10) The integrated circuit according to claim 10, wherein the sequence number is calculated by hopping a sequence number that is not used in a CoMP set, the CoMP set comprising the plurality of base stations or cells performing communication in the coordinated manner, when the CoMP mode is set. ### Claim 14 (depends on 10) The integrated circuit according to claim 10, wherein the sequence number is calculated by hopping a sequence number that is used in CoMP sets in a cell, wherein each of the CoMP sets comprises a plurality of base stations or cells performing communication with a radio communication apparatus in the coordinated manner, when the CoMP mode is set. ### Claim 15 (depends on 10) The integrated circuit according to claim 10, wherein the sequence number is calculated by hopping a sequence number that is not used in CoMP sets in a cell, wherein each of the CoMP sets comprises a plurality of base stations or cells performing communication with a radio communication apparatus in the coordinated manner, when the CoMP mode is set. ### Claim 16 (depends on 10) The integrated circuit according to claim 10, wherein the sequence number is calculated using the hopping pattern, which is defined based on a cell identification number, when the Non-CoMP mode is set. ### Claim 17 (depends on 10) The integrated circuit according to claim 10, wherein the hopping pattern includes a first hopping pattern and a second hopping pattern different from the first hopping pattern, and the sequence number is calculated using the first hopping pattern when the CoMP mode is set, and the sequence number is calculated using the second hopping pattern when the Non-CoMP mode is set. ### Claim 18 (depends on 10) The integrated circuit according to claim 10, wherein when the CoMP mode is set, the terminal transmits a signal to a plurality of cells capable of coordinating a reconstruction of a single signal based each of the plurality of signals received by the cells.