# US 2019/0174500 A1 · Transmitter, receiver, transmission method, and reception method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0174500 A1 - Document ID: US20190174500A1 - Status: Published application - Kind: A1 - Application number: 16/269,205 - Filed: 2019-02-06 - Published: 2019-06-06 - Earliest claimed: 2011-01-07 - Assignees: Sun Patent Trust - Applicants: Sun Patent Trust - Inventors: Yoshihiko Ogawa; Akihiko Nishio; Masayuki Hoshino; Takashi Iwai - Web page: https://patentgrep.com/patent/US20190174500A1 ## CPC - H04L 27/2613: {Structure of the reference signals} - H04B 7/0615: {of weighted versions of same signal} - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04B 7/0684: {using different training sequences per antenna} - H04J 13/004: {Orthogonal} - H04L 5/0016: {Time-frequency-code} - H04L 5/0023: {Time-frequency-space} - H04L 5/0037: {Inter-user or inter-terminal allocation} - 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} - 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 5/0058: {Allocation criteria} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 69/324: in the data link layer [OSI layer 2], e.g. HDLC - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 72/04: Wireless resource allocation - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/20: Control channels or signalling for resource management - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - 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 Provided is a transmitter which improves the flexibility of SRS resource allocation without increasing the amount of signaling for notifying the cyclic shift amount. In the transmitter, with regard to each basic shift amount candidate group having a basic shift amount from 0 to N−1, a transmission control unit (206) specifies the actual shift amount imparted to a cyclic shift sequence used in scrambling a reference signal transmitted from each antenna port, said specification being performed based on a table in which cyclic shift amount candidates correspond to each antenna port, and based on setting information transmitted from a base station (100). With regard to basic shift amount candidates for shift amount X, the table differentiates between an offset pattern comprising offset values for cyclic shift amount candidates corresponding to each antenna port and an offset pattern corresponding to basic shift amount candidates of X+N/2. ## Claims ### Claim 1 An integrated circuit configured to control operation of a communication apparatus, the integrated circuit comprising: circuitry, which, in operation, controls determining, for reference signals which are transmitted from a plurality of antenna ports, frequency resources from a plurality of candidates, wherein the plurality of candidates include a first candidate and a second candidate, the first candidate includes only first frequency resources, and the second candidate includes the first frequency resources and second frequency resources which are different from the first frequency resources; mapping the reference signals to the frequency resources, wherein, in the first candidate the first frequency resources are used for the reference signals, and in the second candidate the first frequency resources are used for a portion of the reference signals and the second frequency resources are used for a remaining portion of the reference signals; and transmitting the mapped reference signals. ### Claim 2 (depends on 1) The integrated circuitry according to claim 1, wherein the reference signals are multiplexed by orthogonal sequences on the first frequency resources in the first candidate, and the portion of the reference signals are multiplexed by orthogonal sequences on the first frequency resources and the remaining portion of the reference signals are multiplexed by orthogonal sequences on the second frequency resources in the second candidate. ### Claim 3 (depends on 1) The integrated circuit according to claim 1, wherein information relating to the frequency resources is transmitted via a physical downlink control channel (PDCCH). ### Claim 4 (depends on 1) The integrated circuit according to claim 1, wherein, when a cyclic shift index of a first antenna port of the plurality of antenna ports is less than or equal to a determined number, the reference signals are mapped to the first frequency resources. ### Claim 5 (depends on 1) The integrated circuit according to claim 1, wherein, when a cyclic shift index of a first antenna port of the plurality of antenna ports is less than or equal to the determined number, the first frequency resources correspond to all index numbers of the plurality of antenna ports. ### Claim 6 (depends on 1) The integrated circuit according to claim 1, wherein, when a cyclic shift index of a first antenna port of the plurality of antenna ports is greater than a determined number, the first frequency resources correspond to odd index numbers of the antenna ports and the second frequency resources correspond to even index numbers of the antenna ports. ### Claim 7 (depends on 1) The integrated circuit according to claim 1, wherein a number of the plurality of antenna ports is four, the first frequency resources correspond to antenna ports with index numbers 1 and 3, and the second frequency resources correspond to antenna ports with index numbers 2 and 4 when a cyclic shift index of a first antenna port of the plurality of antenna ports is greater than a determined number. ### Claim 8 (depends on 1) The integrated circuit according to claim 1, wherein each of the second frequency resources is next to each of the first frequency resources. ### Claim 9 An integrated circuit configured to control operation of a communication apparatus, the integrated circuit comprising: circuitry, which, in operation, controls determining, for reference signals which are transmitted from a plurality of antenna ports, frequency resources from a plurality of candidates, wherein the plurality of candidates include a first candidate and a second candidate, the first candidate includes only first frequency resources, and the second candidate includes the first frequency resources and second frequency resources which are different from the first frequency resources; and receiving the reference signals on the determined frequency resources; wherein, in the first candidate the first frequency resources are used for the reference signals, and in the second candidate the first frequency resources are used for a portion of the reference signals and the second frequency resources are used for a remaining portion of the reference signals. ### Claim 10 (depends on 9) The integrated circuit according to claim 9, wherein the reference signals are multiplexed by orthogonal sequences on the first frequency resources in the first candidate, and the portion of the reference signals are multiplexed by orthogonal sequences on the first frequency resources and the remaining portion of the reference signals are multiplexed by orthogonal sequences on the second frequency resources in the second candidate. ### Claim 11 (depends on 9) The integrated circuit according to claim 9, wherein information relating to the frequency resources is transmitted via a physical downlink control channel (PDCCH). ### Claim 12 (depends on 9) The integrated circuit according to claim 9, wherein, when a cyclic shift index of a first antenna port of the plurality of antenna ports is less than or equal to a determined number, the reference signals are mapped to the first frequency resources. ### Claim 13 (depends on 9) The integrated circuit according to claim 9, wherein, when a cyclic shift index of a first antenna port of the plurality of antenna ports is less than or equal to the determined number, the first frequency resources correspond to all index numbers of the plurality of antenna ports. ### Claim 14 (depends on 9) The integrated circuit according to claim 9, wherein, when a cyclic shift index of a first antenna port of the plurality of antenna ports is greater than a determined number, the first frequency resources correspond to odd index numbers of the antenna ports and the second frequency resources correspond to even index numbers of the antenna ports. ### Claim 15 (depends on 9) The integrated circuit according to claim 9, wherein a number of the plurality of antenna ports is four, the first frequency resources correspond to antenna ports with index numbers 1 and 3, and the second frequency resources correspond to antenna ports with index numbers 2 and 4 when a cyclic shift index of a first antenna port of the plurality of antenna ports is greater than a determined number. ### Claim 16 (depends on 9) The integrated circuit according to claim 9, wherein each of the second frequency resources is next to each of the first frequency resources.