# US 9,882,699 B2 · Device and method of handling device-to-cellular communication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,882,699 B2 - Document ID: US9882699B2 - Status: Granted - Kind: B2 - Application number: 14/818,286 - Filed: 2015-08-04 - Published: 2016-02-04 - Granted: 2018-01-30 - Earliest claimed: 2014-08-04 - Assignees: HTC Corporation - Applicants: HTC Corporation - Inventors: Ling-San Meng; Chih-Yao Wu - Web page: https://patentgrep.com/patent/US9882699B2 ## CPC - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/1854: {Scheduling and prioritising arrangements} - 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 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0092: {Indication of how the channel is divided} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 76/14: Direct-mode setup - H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - 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 A network for handling a downlink (DL) transmission in a frequency-division duplexing (FDD) system comprise a storage unit for storing instructions and a processing means coupled to the storage unit. The processing means is configured to execute the instructions stored in the storage unit. The instructions comprise selecting a reference configuration for a DL transmission of a communication device from a plurality of configuration candidates; transmitting information of the reference configuration to the communication device; receiving a hybrid automatic repeat request (HARQ) feedback corresponding to the DL transmission from the communication device according to the reference configuration; and performing the DL transmission with the communication device according to the reference configuration. ## Claims ### Claim 1 A network for handling a downlink (DL) transmission in a frequency-division duplexing (FDD) system, comprising: a storage unit for storing instructions of: selecting a first reference configuration for a DL transmission of a communication device from a plurality of configuration candidates, wherein the plurality of configuration candidates comprise at least one configuration for a hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) reporting in a time-division duplexing (TDD) system and at least one timing reference for the HARQ ACK/NACK reporting in a FDD-TDD carrier aggregation system; transmitting information of the first reference configuration to the communication device; performing the DL transmission with the communication device according to the first reference configuration; and receiving a HARQ feedback corresponding to the DL transmission from the communication device according to the first reference configuration, when a device-to-device (D2D) communication occurs in a first subframe which is four subframes after a second subframe where the DL transmission is performed; and a processing means, coupled to the storage unit, configured to execute the instructions stored in the storage unit. ### Claim 2 (depends on 1) The network of claim 1, wherein the first reference configuration is selected according to at least one of a DL traffic condition of the communication device, an interference level, a cell loading of the network, or a resource pattern of the communication device. ### Claim 3 (depends on 1) The network of claim 1, wherein the network is configured to receive the HARQ feedback in the first subframe, when the D2D communication does not occur in the first subframe. ### Claim 4 (depends on 1) The network of claim 1, wherein the network is configured to receive the HARQ feedback in a third subframe which is more than four subframes after the second subframe, when the D2D communication occurs in the first subframe. ### Claim 5 (depends on 1) The network of claim 1, wherein the HARQ feedback further corresponds to another DL transmission from the communication device. ### Claim 6 (depends on 1) The network of claim 1, wherein the FDD system is a half-duplex (HD) FDD system or is a full-duplex (FD) FDD system. ### Claim 7 (depends on 1) The network of claim 1, wherein a HARQ timing of the network receiving the HARQ feedback corresponding to the DL transmission to the communication device is determined based on both the first reference configuration and a second reference configuration, when the network is reconfiguring from the first reference configuration to the second reference configuration. ### Claim 8 (depends on 7) The network of claim 7, wherein the HARQ timing and a timing of the DL transmission to the communication device satisfy both the first reference configuration and the second reference configuration. ### Claim 9 A communication device for handling a downlink (DL) transmission in a frequency-division duplexing (FDD) system, comprising: a storage unit for storing instructions of: receiving information of a first reference configuration for a DL transmission from a network, wherein the first reference configuration is selected from a plurality of configuration candidates, and the plurality of configuration candidates comprises at least one configuration for a hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) reporting in a time-division duplexing (TDD) system and at least one timing reference for the HARQ ACK/NACK reporting in a FDD-TDD carrier aggregation system; performing the DL transmission with the network according to the first reference configuration; and transmitting a HARQ feedback corresponding to the DL transmission to the network according to the first reference configuration, when a device-to-device (D2D) communication occurs in a first subframe which is four subframes after a second subframe where the DL transmission is performed; and a processing means, coupled to the storage unit, configured to execute the instructions stored in the storage unit. ### Claim 10 (depends on 9) The communication device of claim 9, wherein the communication device is configured to transmit the HARQ feedback in the first subframe, when the D2D communication does not occur in the first subframe. ### Claim 11 (depends on 9) The communication device of claim 9, wherein the communication device is configured to transmit the HARQ feedback in a third subframe which is more than four subframes after the second subframe, when the D2D communication occurs in the first subframe. ### Claim 12 (depends on 9) The communication device of claim 9, wherein the first reference configuration is selected from a plurality of configuration candidates by the network according to at least one of a DL traffic condition of the communication device, an interference level, a cell loading of the network, or a resource pattern of the communication device. ### Claim 13 (depends on 9) The communication device of claim 9, wherein a HARQ timing of the communication device transmitting the HARQ feedback corresponding to the DL transmission from the network is determined based on both the first reference configuration and a second reference configuration, when the communication device is being reconfigured by the network from the first reference configuration to the second reference configuration. ### Claim 14 (depends on 13) The communication device of claim 13, wherein the HARQ timing and a timing of the DL transmission from the network satisfy both the first reference configuration and the second reference configuration. ### Claim 15 (depends on 9) The communication device of claim 9, wherein the HARQ feedback further corresponds to another DL transmission with the network. ### Claim 16 (depends on 9) The communication device of claim 9, wherein the FDD system is a half-duplex (HD) FDD system or is a full-duplex (FD) FDD system.