# US 9,438,398 B2 · Wireless base station apparatus, wireless terminal apparatus, frequency resource allocation method, and method of forming transmission signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,438,398 B2 - Document ID: US9438398B2 - Status: Granted - Kind: B2 - Application number: 14/875,444 - Filed: 2015-10-05 - Published: 2016-01-28 - Granted: 2016-09-06 - Earliest claimed: 2009-04-10 - Assignees: Sun Patent Trust - Applicants: Sun Patent Trust - Inventors: Takashi Iwai; Akihiko Nishio; Daichi Imamura; Seigo Nakao; Yoshihiko Ogawa - Web page: https://patentgrep.com/patent/US9438398B2 ## CPC - 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)} - H04B 1/713: using frequency hopping - H04L 5/0041: {Frequency-non-contiguous} - H04L 5/0057: {Physical resource allocation for CQI} - H04L 5/006: {Quality of the received signal, e.g. BER, SNR, water filling} - H04L 5/0064: {Rate requirement of the data, e.g. scalable bandwidth, data priority} - H04L 25/0224: {using sounding signals} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 72/52: based on load - H04W 72/542: using measured or perceived quality - H04W 24/00: Supervisory, monitoring or testing arrangements - H04W 88/08: Access point devices - 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 A wireless base station apparatus and wireless terminal apparatus with a configuration which can prevent reductions in the accuracy of channel estimation when non-contiguous band transmission and SRS transmission are employed in an uplink line. In the base station apparatus (100), an allocation setting unit (106), which sets the reception band of an SRS at an SRS extraction unit (103) and sets the units of frequency allocation (RBG) at a CQ1 estimation unit (104) and allocation unit (105), matches the frequency position at the end of the SRS reception band to the frequency position at the end of any of the units of frequency allocation and sets the reception bandwidth of the reference signal to a natural number multiple of the bandwidth of the unit of frequency allocation. In the terminal apparatus (200), a band information setting unit (204), which sets the transmission band and units of frequency allocation (RBG), matches the frequency position at the end of the transmission band to the frequency position at the end of any of the units of frequency allocation and sets the transmission bandwidth of the SRS to a natural number multiple of the bandwidth of the unit of frequency allocation. ## Claims ### Claim 1 A communication apparatus comprising: transmission band setting circuitry, which, in operation, configures a plurality of consecutive resource block groups (RBGs) in a system band, and configures a sounding reference signal transmission band (SRS transmission band) on a portion of the system band, wherein a frequency position of an edge of one of the plurality of RGBs matches with a frequency position of an edge of the SRS transmission band; and mapping circuitry, which, in operation, maps a sounding reference signal (SRS) to the SRS transmission band, a number of RBs included in the SRS transmission band being a multiple of a number of resource blocks (RBs) that form one RBG. ### Claim 2 (depends on 1) The communication apparatus according to claim 1, comprising a transmitter, which, in operation transmits the mapped SRS to a base station. ### Claim 3 (depends on 1) The communication apparatus according to claim 1, wherein the transmission band setting circuitry sets a bandwidth of the SRS transmission band, a position of the SRS transmission band in the system band, and information regarding a frequency hopping pattern of an SRS transmission. ### Claim 4 (depends on 1) The communication apparatus according to claim 1, wherein the number of RBs that form one RBG is determined according to a bandwidth of the system band. ### Claim 5 (depends on 1) The communication apparatus according to claim 1, wherein a minimum number of RBs included in the SRS transmission band is 4. ### Claim 6 (depends on 1) The communication apparatus according to claim 1, wherein the number of RBs included in the SRS transmission band is a multiple of 4. ### Claim 7 A communication method comprising: configuring a plurality of consecutive resource block groups (RBGs) in a system band; configuring a sounding reference signal transmission band (SRS transmission band) on a portion of the system band, wherein a frequency position of an edge of one of the plurality of RBGs matches with a frequency position of an edge of the SRS transmission band; and mapping a sounding reference signal (SRS) to the SRS transmission band, a number of RBs included in the SRS transmission band being a multiple of a number of resource blocks (RBs) that form one RBG. ### Claim 8 (depends on 7) The communication method according to claim 7, comprising transmitting the mapped SRS to a base station. ### Claim 9 (depends on 7) The communication method according to claim 7, comprising: setting a bandwidth of the SRS transmission band, a position of the SRS transmission band in the system band and information regarding a frequency hopping pattern of an SRS transmission. ### Claim 10 (depends on 7) The communication method according to claim 7, wherein the number of RBs that form one RBG is determined according to a bandwidth of the system band. ### Claim 11 (depends on 7) The communication method according to claim 7, wherein a minimum number of RBs included in the SRS transmission band is 4. ### Claim 12 (depends on 7) The communication method according to claim 7, wherein the number of RBs included in the SRS transmission band is a multiple of 4. ### Claim 13 A communication apparatus comprising: control circuitry, which, in operation, configures a plurality of consecutive resource block groups (RBGs) in a system band, and configures a sounding reference signal transmission band (SRS transmission band) on a portion of the system band, wherein a frequency position of an edge of one of the plurality of RGBs matches with a frequency position of an edge of the SRS transmission band; and maps a sounding reference signal (SRS) to the SRS transmission band, a number of RBs included in the SRS transmission band being a multiple of the number of resource blocks (RBs) that form one RBG; and transmission circuitry, which, in operation, transmits the mapped SRS to a base station. ### Claim 14 (depends on 13) The communication apparatus according to claim 13, wherein the transmission band setting circuitry sets a bandwidth of the SRS transmission band, a position of the SRS transmission band in the system band, and information regarding a frequency hopping pattern of the SRS transmission. ### Claim 15 (depends on 13) The communication apparatus according to claim 13, wherein the number of RBs that form one RBG is determined according to a bandwidth of the system band. ### Claim 16 (depends on 13) The communication apparatus according to claim 13, wherein a minimum number of RBs included in the SRS transmission band is 4. ### Claim 17 (depends on 13) The communication apparatus according to claim 13, wherein the number of RBs included in the SRS transmission band is a multiple of 4.