# US 10,484,155 B2 · Communication apparatus and retransmission control method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,155 B2 - Document ID: US10484155B2 - Status: Granted - Kind: B2 - Application number: 16/157,963 - Filed: 2018-10-11 - Published: 2019-02-07 - Granted: 2019-11-19 - Earliest claimed: 2011-08-12 - Assignees: Panasonic Intellectual Property Corporation of America - Applicants: Panasonic Intellectual Property Corporation of America - Inventors: Ayako Horiuchi; Akihiko Nishio - Web page: https://patentgrep.com/patent/US10484155B2 ## 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)} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 1/1887: {Scheduling and prioritising arrangements} - H04L 1/1896: {ARQ related signaling} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 2001/125: {Arrangements for preventing errors in the return channel} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - 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 wireless communication device. A PHICH reception unit determines whether a received signal in a PHICH region is an ACK signal or a NACK signal. When doing so, the PHICH reception unit does not receive a PHICH in a subframe in which a terminal monitors an E-PDCCH. A control signal reception unit outputs a retransmission prompting signal to a signal allocation unit when the signal outputted from the PHICH reception unit is a NACK signal and when a UL grant was not detected. Meanwhile, when a UL grant was detected, the control signal reception unit outputs the detected UL grant to the signal allocation unit. The signal allocation unit maps the transmission signal in accordance with the retransmission prompting signal and the UL grant and transmits the transmission signal from a wireless transmission unit. ## Claims ### Claim 1 A communication apparatus comprising: a receiver, which, in operation, in case of carrier aggregation aggregating a primary cell and one or more secondary cells, receives a physical HARQ indicator channel (PHICH) including an ACK or NACK transmitted from another communication apparatus in the primary cell and not in the one or more secondary cells; a retransmission controller, which, in operation, controls retransmission of data to the other communication apparatus in the primary cell based on the PHICH and assignment control information received in the primary cell, and controls retransmission of data to the other communication apparatus in the one or more secondary cells based on assignment control information received in one of the primary cell and the one or more secondary cells and not based on the PHICH; and a transmitter, which, in operation, transmits the retransmission data on a physical uplink shared channel (PUSCH). ### Claim 2 (depends on 1) The communication apparatus according to claim 1, wherein the receiver receives the PHICH in only one of two subsets of subframes, wherein the only one subset is either in a channel state information (CSI) measurement set or in a mobility measurement set. ### Claim 3 (depends on 1) The communication apparatus according to claim 1, wherein the receiver receives the PHICH in a MBSFN (multimedia broadcast multicast service single frequency network) subframe and not in a non-MBSFN subframe. ### Claim 4 (depends on 1) The communication apparatus according to claim 1, wherein the receiver receives the PHICH in a non-MBSFN (multimedia broadcast multicast service single frequency network) subframe and not in a MBSFN subframe. ### Claim 5 (depends on 1) The communication apparatus according to claim 1, wherein the receiver receives the PHICH out of a number of PHICHs configured by a higher layer. ### Claim 6 (depends on 1) The communication apparatus according to claim 1, wherein the receiver receives the assignment control information via a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH). ### Claim 7 (depends on 1) The communication apparatus according to claim 1, which supports Cooperative Multi-Point (CoMP). ### Claim 8 A retransmission control method comprising: in case of carrier aggregation aggregating a primary cell and one or more secondary cells, a first communication apparatus receiving a physical HARQ indicator channel (PHICH) including an ACK or NACK transmitted from a second communication apparatus in the primary cell and not in the one or more secondary cells; the first communication apparatus controlling retransmission of data to the second communication apparatus in the primary cell based on the PHICH and assignment control information received in the primary cell; the first communication apparatus controlling retransmission of data to the second communication apparatus in the one or more secondary cells based on assignment control information received in one of the primary cell and the one or more secondary cells and not based on the PHICH; and the first communication apparatus transmitting the retransmission data on a physical uplink shared channel (PUSCH). ### Claim 9 (depends on 8) The retransmission control method according to claim 8, comprising: the first communication apparatus receiving the PHICH in only one of two subsets of subframes, wherein the only one subset is either in a channel state information (CSI) measurement set or in a mobility measurement set. ### Claim 10 (depends on 8) The retransmission control method according to claim 8, comprising: the first communication apparatus receiving the PHICH in a MBSFN (multimedia broadcast multicast service single frequency network) subframe and not in a non-MBSFN subframe. ### Claim 11 (depends on 8) The retransmission control method according to claim 8, comprising: the first communication apparatus receiving the PHICH in a non-MBSFN (multimedia broadcast multicast service single frequency network) subframe and not in a MBSFN subframe. ### Claim 12 (depends on 8) The retransmission control method according to claim 8, comprising: the first communication apparatus receiving the PHICH out of a number of PHICHs configured by a higher layer. ### Claim 13 (depends on 8) The retransmission control method according to claim 8, comprising: the first communication apparatus receiving the assignment control information via a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH). ### Claim 14 (depends on 8) The retransmission control method according to claim 8, wherein: the first communication apparatus supports Cooperative Multi-Point (CoMP).