# US 2019/0174532 A1 · Flexible multiplexing and feedback for variable transmission time intervals > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0174532 A1 - Document ID: US20190174532A1 - Status: Published application - Kind: A1 - Application number: 16/245,802 - Filed: 2019-01-11 - Published: 2019-06-06 - Earliest claimed: 2014-10-24 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Jelena Damnjanovic; Taesang Yoo; Siddhartha Mallik; Aleksandar Damnjanovic; Arumugam Chendamarai Kannan; Madhavan Srinivasan Vajapeyam; Durga Prasad Malladi; Yongbin Wei; Tao Luo - Web page: https://patentgrep.com/patent/US20190174532A1 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04W 72/0446: Resources in time domain, e.g. slots or frames - 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. A base station may employ a multiplexing configuration based on latency and efficiency considerations. The base station may transmit a resource grant, a signal indicating the length of a downlink (DL) transmission time interval (TTI), and a signal indicating the length of a subsequent uplink (UL) TTI to one or more user equipment (UEs). The base station may dynamically select a new multiplexing configuration by, for example, setting the length of an UL TTI to zero or assigning multiple UEs resources in the same DL TTI. Latency may also be reduced by employing block feedback, such as block hybrid automatic repeat request (HARQ) feedback. A UE may determine and transmit HARQ feedback for each transport block (TB) of a set of TBs, which may be based on a time duration of a downlink TTI. ## Claims ### Claim 1 (canceled) ### Claim 2 A method of wireless communication comprising: identifying a slot format configuration comprising a first set of designated downlink symbols, a second set of flexible symbols that are able to be switched from downlink symbols to uplink symbols and from uplink symbols to downlink symbols, and a third set of designated uplink symbols, wherein the first set, the second set, and the third set are time division duplexed such that the second set follows the first set and precedes the third set in the slot format configuration; receiving, from a base station, a first indication indicating that each of the flexible symbols of the second set is configured to receive a downlink transmission or transmit an uplink transmission in a first slot; and communicating with the base station in the first slot based at least in part on the slot format configuration and the first indication. ### Claim 3 (depends on 2) The method of claim 2, further comprising: receiving, from the base station, a second indication switching a first subset of the flexible symbols of the second set from downlink symbols to uplink symbols or from uplink symbols to downlink symbols; and communicating with the base station in a second slot based at least in part on the second indication, wherein the second indication switches the first subset of the flexible symbols for the second slot. ### Claim 4 (depends on 3) The method of claim 3, wherein the second indication is received in a control channel. ### Claim 5 (depends on 4) The method of claim 4, wherein the second indication is received in a downlink control information (DCI). ### Claim 6 (depends on 3) The method of claim 3, further comprising: receiving a third indication switching a second subset of the flexible symbols of the second set from downlink symbols to uplink symbols or from uplink symbols to downlink symbols; and communicating with the base station in a third slot based at least in part on the third indication, wherein the third indication switches the second subset of the flexible symbols for the third slot. ### Claim 7 (depends on 6) The method of claim 6, wherein the third indication is received in a control channel. ### Claim 8 (depends on 2) The method of claim 2, further comprising: receiving downlink transmissions in the first slot during the first set of designated downlink symbols; and transmitting uplink transmissions in the first slot during the third set of designated uplink symbols. ### Claim 9 (depends on 2) The method of claim 2, wherein the first indication is received via radio resource control (RRC) signaling. ### Claim 10 (depends on 2) The method of claim 2, wherein the first indication is received via physical downlink control channel signaling. ### Claim 11 An apparatus for wireless communication, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: identify a slot format configuration comprising a first set of designated downlink symbols, a second set of flexible symbols that are able to be switched from downlink symbols to uplink symbols and from uplink symbols to downlink symbols, and a third set of designated uplink symbols, wherein the first set, the second set, and the third set are time division duplexed such that the second set follows the first set and precedes the third set in the slot format configuration; receive, from a base station, a first indication indicating that each of the flexible symbols of the second set is configured to receive a downlink transmission or transmit an uplink transmission in a first slot; and communicate with the base station in the first slot based at least in part on the slot format configuration and the first indication. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the instructions are further executable to: receive, from the base station, a second indication switching a first subset of the flexible symbols of the second set from downlink symbols to uplink symbols or from uplink symbols to downlink symbols; and communicate with the base station in a second slot based at least in part on the second indication, wherein the second indication switches the first subset of the flexible symbols for the second slot. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the second indication is received in a control channel. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the second indication is received in a downlink control information (DCI). ### Claim 15 (depends on 12) The apparatus of claim 12, wherein the instructions are further executable to: receive a third indication switching a second subset of the flexible symbols of the second set from downlink symbols to uplink symbols or from uplink symbols to downlink symbols; and communicate with the base station in a third slot based at least in part on the third indication, wherein the third indication switches the second subset of the flexible symbols for the third slot. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the third indication is received in a control channel. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the third indication is received in a downlink control information (DCI). ### Claim 18 (depends on 11) The apparatus of claim 11, wherein the instructions are further executable to: receive downlink transmissions in the first slot during the first set of designated downlink symbols; and transmit uplink transmissions in the first slot during the third set of designated uplink symbols. ### Claim 19 (depends on 11) The apparatus of claim 11, wherein the first indication is received via radio resource control (RRC) signaling. ### Claim 20 (depends on 11) The apparatus of claim 11, wherein the first indication is received via physical downlink control channel signaling. ### Claim 21 An apparatus for wireless communication comprising: means for identifying a slot format configuration comprising a first set of designated downlink symbols, a second set of flexible symbols that are able to be switched from downlink symbols to uplink symbols and from uplink symbols to downlink symbols, and a third set of designated uplink symbols, wherein the first set, the second set, and the third set are time division duplexed such that the second set follows the first set and precedes the third set in the slot format configuration; means for receiving, from a base station, a first indication indicating that each of the flexible symbols of the second set is configured to receive a downlink transmission or transmit an uplink transmission in a first slot; and means for communicating with the base station in the first slot based at least in part on the slot format configuration and the first indication. ### Claim 22 (depends on 21) The apparatus of claim 21, further comprising: means for receiving, from the base station, a second indication switching a first subset of the flexible symbols of the second set from downlink symbols to uplink symbols or from uplink symbols to downlink symbols; and means for communicating with the base station in a second slot based at least in part on the second indication, wherein the second indication switches the first subset of the flexible symbols for the second slot. ### Claim 23 (depends on 22) The apparatus of claim 22, wherein the second indication is received in a control channel. ### Claim 24 (depends on 23) The apparatus of claim 23, wherein the second indication is received in a downlink control information (DCI). ### Claim 25 (depends on 22) The apparatus of claim 22, further comprising: means for receiving a third indication switching a second subset of the flexible symbols of the second set from downlink symbols to uplink symbols or from uplink symbols to downlink symbols; and means for communicating with the base station in a third slot based at least in part on the third indication, wherein the third indication switches the second subset of the flexible symbols for the third slot. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the third indication is received in a control channel. ### Claim 27 (depends on 21) The apparatus of claim 21, further comprising: means for receiving downlink transmissions in the first slot during the first set of designated downlink symbols; and means for transmitting uplink transmissions in the first slot during the third set of designated uplink symbols. ### Claim 28 (depends on 21) The apparatus of claim 21, wherein the first indication is received via radio resource control (RRC) signaling. ### Claim 29 (depends on 21) The apparatus of claim 21, wherein the first indication is received via physical downlink control channel signaling. ### Claim 30 A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable to: identify a slot format configuration comprising a first set of designated downlink symbols, a second set of flexible symbols that are able to be switched from downlink symbols to uplink symbols and from uplink symbols to downlink symbols, and a third set of designated uplink symbols, wherein the first set, the second set, and the third set are time division duplexed such that the second set follows the first set and precedes the third set in the slot format configuration; receive, from a base station, a first indication indicating that each of the flexible symbols of the second set is configured to receive a downlink transmission or transmit an uplink transmission in a first slot; and communicate with the base station in the first slot based at least in part on the slot format configuration and the first indication. ### Claim 31 (depends on 30) The non-transitory computer-readable medium of claim 30, wherein the instructions are further executable to: receive, from the base station, a second indication switching a first subset of the flexible symbols of the second set from downlink symbols to uplink symbols or from uplink symbols to downlink symbols; and communicate with the base station in a second slot based at least in part on the second indication, wherein the second indication switches the first subset of the flexible symbols for the second slot.