# US 11,310,826 B2 · Signature based integrity check design for downlink grant error protection in enhanced component carriers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,826 B2 - Document ID: US11310826B2 - Status: Granted - Kind: B2 - Application number: 15/369,642 - Filed: 2016-12-05 - Published: 2017-07-27 - Granted: 2022-04-19 - Earliest claimed: 2016-01-26 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Jing Sun; Taesang Yoo; Tao Luo - Web page: https://patentgrep.com/patent/US11310826B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 1/1671: {the supervisory signal being transmitted together with control information} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)} - H04L 1/1896: {ARQ related signaling} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 1/1887: {Scheduling and prioritising arrangements} - 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 Methods, systems, and devices for wireless communication are described. After receiving a transmission, a user equipment (UE) may store status information for the transmission and send an acknowledgment message that includes a signature. When a base station receives an acknowledgment message with a signature, it may transmit a subsequent downlink grant that includes the same signature. The signature included in a downlink grant may enable the UE to retrieve a stored status and decode the next data transmission based on the retrieved status. That is, the base station may use the signature in the grant to indicate which acknowledgment the grant is based on. ## Claims ### Claim 1 A method of wireless communication comprising: receiving a downlink grant, wherein the downlink grant comprises a first bit field that includes a first signature; identifying a stored first status based at least in part on the first signature; decoding a data transmission based at least in part on the downlink grant and the stored first status; and transmitting an acknowledgment message for the data transmission, wherein the acknowledgment message comprises a second bit field that includes a second signature that is a function of the first signature and different from the first signature. ### Claim 2 (depends on 1) The method of claim 1, further comprising: storing a second status indexed with the second signature based at least in part on decoding the data transmission. ### Claim 3 (depends on 2) The method of claim 2, wherein the first status is stored in a first page of memory and the second status is stored in a second page of memory. ### Claim 4 (depends on 1) The method of claim 1, further comprising: transitioning from a hybrid automatic repeat request (HARQ) idle state to a HARQ pending state following the transmission of the acknowledgment message. ### Claim 5 (depends on 4) The method of claim 4, further comprising: transitioning from the HARQ pending state to the HARQ idle state following the receipt of the first signature. ### Claim 6 (depends on 1) The method of claim 1, wherein the first signature and the second signature are different values, and wherein the second signature is an increment of the first signature. ### Claim 7 (depends on 1) The method of claim 1, wherein the stored first status comprises one or more of a transport block (TB) structure, a code block (CB) identifier, or log likelihood ratio (LLR) buffer contents, wherein the data transmission is decoded based at least in part on the one or more of the TB structure, the CB identifier, or the LLR buffer contents for decoding the data transmission. ### Claim 8 A method of wireless communication comprising: receiving a first acknowledgment message, wherein the first acknowledgment message comprises feedback information and a first bit field that includes a first signature; and transmitting a downlink grant based at least in part on the first acknowledgment message, wherein the downlink grant comprises a second bit field that includes the first signature; transmitting a data message using resources in the downlink grant; and receiving a second acknowledgment message comprising a second signature in response to the data message, wherein the second signature is a function of the first signature and different from the first signature. ### Claim 9 (depends on 8) The method of claim 8, further comprising: determining that a second acknowledgment message corresponding to the downlink grant has not been received; and transmitting a subsequent downlink grant comprising the first signature based at least in part on the determination. ### Claim 10 (depends on 8) The method of claim 8, further comprising: transitioning from a hybrid automatic repeat request (HARQ) idle state to a HARQ pending state following the transmission of the downlink grant. ### Claim 11 (depends on 10) The method of claim 10, further comprising: transitioning from the HARQ pending state to the HARQ idle state following the receipt of the first acknowledgment message. ### Claim 12 An apparatus for wireless communication, comprising: a processor; memory in communication with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: receive a downlink grant, wherein the downlink grant comprises a first bit field that includes a first signature; identify a stored first status based at least in part on the first signature; decode a data transmission based at least in part on the downlink grant and the stored first status; and transmit an acknowledgment message for the data transmission, wherein the acknowledgment message comprises a second bit field that includes a second signature that is a function of the first signature and different from the first signature. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the instructions are operable to cause the processor to: store a second status indexed with the second signature based at least in part on decoding the data transmission. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the first status is stored in a first page of memory and the second status is stored in a second page of memory. ### Claim 15 (depends on 12) The apparatus of claim 12, wherein the instructions are operable to cause the processor to: transition from a hybrid automatic repeat request (HARQ) idle state to a HARQ pending state following the transmission of the acknowledgment message. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the instructions are operable to cause the processor to: transition from the HARQ pending state to the HARQ idle state following the receipt of the first signature. ### Claim 17 (depends on 12) The apparatus of claim 12, wherein the first signature and the second signature are different values, and wherein the second signature is an increment of the first signature. ### Claim 18 (depends on 12) The apparatus of claim 12, wherein the stored first status comprises one or more of a transport block (TB) structure, a code block (CB) identifier, or log likelihood ratio (LLR) buffer contents, wherein the data transmission is decoded based at least in part on the one or more of the TB structure, the CB identifier, or the LLR buffer contents for decoding the data transmission. ### Claim 19 An apparatus for wireless communication, comprising: a processor; memory in communication with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: receive a first acknowledgment message, wherein the first acknowledgment message comprises feedback information and a first bit field that includes a first signature; and transmit a downlink grant based at least in part on the first acknowledgment message, wherein the downlink grant comprises a second bit field that includes the first signature, wherein the instructions are operable to cause the processor to: transmit a data message using resources in the downlink grant; and receive a second acknowledgment message comprising a second signature in response to the data message, wherein the second signature is a function of the first signature and different from the first signature. ### Claim 20 (depends on 19) The apparatus of claim 19, wherein the instructions are operable to cause the processor to: determine that a second acknowledgment message corresponding to the downlink grant has not been received; and transmit a subsequent downlink grant comprising the first signature based at least in part on the determination. ### Claim 21 (depends on 19) The apparatus of claim 19, wherein the instructions are operable to cause the processor to: transition from a hybrid automatic repeat request (HARQ) idle state to a HARQ pending state following the transmission of the downlink grant. ### Claim 22 (depends on 21) The apparatus of claim 21, wherein the instructions are operable to cause the processor to: transition from the HARQ pending state to the HARQ idle state following the receipt of the first acknowledgment message.