# US 12,010,696 B2 · Communication apparatus and communication method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,010,696 B2 - Document ID: US12010696B2 - Status: Granted - Kind: B2 - Application number: 17/332,659 - Filed: 2021-05-27 - Published: 2021-09-16 - Granted: 2024-06-11 - Earliest claimed: 2008-10-31 - Assignees: Sun Patent Trust - Applicants: Sun Patent Trust - Inventors: Seigo Nakao; Akihiko Nishio; Daichi Imamura; Takahisa Aoyama - Web page: https://patentgrep.com/patent/US12010696B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 1/004: {by using forward error control (H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00)} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/003: {Arrangements for allocating sub-channels of the transmission path} - H04L 5/0046: {Determination of the number of bits transmitted on different sub-channels} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Provided are a radio terminal device, a radio base station device, and a channel signal forming method which can prevent quality degradation of the downlink resource allocation information by reducing the frequency of the zero information addition process to the downlink resource allocation information when executing communication using an uplink unit band and multiple downlink unit bands correlated to the uplink unit band. A base station includes: a PDCCH generation unit which includes the uplink allocation information relating to the uplink unit band only in some of the channel signals formed for each of the downlink unit bands; and a padding unit which adds zero information to the downlink allocation information only in the selected some channel signals having the bandwidth of the corresponding downlink unit band smaller than that of the uplink unit band until the downlink allocation information size becomes equal to the uplink allocation information size. ## Claims ### Claim 1 A communication apparatus, for which a first downlink component carrier, a second downlink component carrier, and an uplink component carrier are configured, the communication apparatus comprising: circuitry, which, in operation, generates a first downlink control signal with a first payload size and a second downlink control signal with a second payload size, wherein the first downlink control signal includes first resource allocation information related to one of the uplink component carrier and the first downlink component carrier, and the second downlink control signal includes second resource allocation information related to the second downlink component carrier; and a transmitter, which is coupled to the circuitry and which, in operation, transmits the first downlink control signal over the first downlink component carrier and transmits the second downlink control signal over the second downlink component carrier; wherein, the first payload size is determined based on a larger one of a number of information bits related to the first downlink component carrier and a number of information bits related to the uplink component carrier; and wherein, the second payload size is determined based on a number of information bits related to the second downlink component carrier. ### Claim 2 (depends on 1) The communication apparatus according to claim 1, wherein Cyclic Redundancy Check (CRC) bits are used to distinguish between the first downlink control signal and the second downlink control information. ### Claim 3 (depends on 1) The communication apparatus according to claim 1, wherein a bandwidth of the first downlink component carrier, a bandwidth of the second downlink component carrier, and a bandwidth of the uplink component carrier are set independently. ### Claim 4 (depends on 1) The communication apparatus according to claim 1, wherein the number of information bits related to the first downlink component carrier is determined based on a bandwidth of the first downlink component carrier, the number of information bits related to the second downlink component carrier is determined based on a bandwidth of the second downlink component carrier, and the number of information bits related to the uplink component carrier is determined based on a bandwidth of the uplink component carrier. ### Claim 5 A communication method performed by a communication apparatus, for which a first downlink component carrier, a second downlink component carrier, and an uplink component carrier are configured, the communication method comprising: generating a first downlink control signal with a first payload size and a second downlink control signal with a second payload size, wherein the first downlink control signal includes first resource allocation information related to one of the uplink component carrier and the first downlink component carrier, and the second downlink control signal includes second resource allocation information related to the second downlink component carrier; and transmitting the first downlink control signal over the first downlink component carrier and the second downlink control signal over the second downlink component carrier; wherein, the first payload size is determined based on a larger one of a number of information bits related to the first downlink component carrier and a number of information bits related to the uplink component carrier; and wherein, the second payload size is determined based on a number of information bits related to the second downlink component carrier. ### Claim 6 (depends on 5) The communication method according to claim 5, wherein Cyclic Redundancy Check (CRC) bits are used to distinguish between the first downlink control signal and the second downlink control information. ### Claim 7 (depends on 5) The communication method according to claim 5, wherein a bandwidth of the first downlink component carrier, a bandwidth of the second downlink component carrier, and a bandwidth of the uplink component carrier are set independently of each other. ### Claim 8 (depends on 5) The communication method according to claim 5, wherein the number of information bits related to the first downlink component carrier is determined based on a bandwidth of the first downlink component carrier, the number of information bits related to the second downlink component carrier is determined based on a bandwidth of the second downlink component carrier, and the number of information bits related to the uplink component carrier is determined based on a bandwidth of the uplink component carrier.