# US 2018/0323939 A1 · Method and apparatus for scheduling uplink transmissions with reduced latency > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0323939 A1 - Document ID: US20180323939A1 - Status: Published application - Kind: A1 - Application number: 16/036,942 - Filed: 2018-07-17 - Published: 2018-11-08 - Earliest claimed: 2016-04-01 - Assignees: Motorola Mobility LLC - Applicants: Motorola Mobility LLC - Inventors: Ravikiran Nory; Vijay Nangia; Hossein Bagheri; Ravi Kuchibhotla - Web page: https://patentgrep.com/patent/US20180323939A1 ## CPC - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)} - H04L 5/0042: {Intra-user or intra-terminal allocation} - H04W 52/346: {distributing total power among users or channels} - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04W 52/281: {taking into account user or data type priority} - H04W 52/365: {Power headroom reporting} - H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range} - H04W 72/0446: Resources in time domain, e.g. slots or frames - 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 configuration can be received from a network. The configuration can enable a device to receive downlink transmissions with different TTI lengths. A first downlink assignment can be received. The first downlink assignment can indicate downlink resources for a first downlink transmission corresponding to a first TTI length. A second downlink assignment can be received. The second downlink assignment can indicate downlink resources for a second downlink transmission corresponding to a second TTI length. The first and the second downlink transmissions can be received. A number of acknowledgment bits needed can be determined in response to the first and second downlink transmissions at least based on the second downlink assignment. The acknowledgment bits can be transmitted in response to the first and second downlink transmissions in an uplink control channel associated with the second downlink assignment. The first and the second transmit time interval lengths can be different. ## Claims ### Claim 1 A method comprising receiving, at a device, a configuration from a network, the configuration enabling the device to receive downlink transmissions with different transmit time interval lengths; receiving a first downlink assignment indicating downlink resources for a first downlink transmission corresponding to a first transmit time interval length; receiving a second downlink assignment indicating downlink resources for a second downlink transmission corresponding to a second transmit time interval length; receiving the first and the second downlink transmissions; determining a number of acknowledgment bits needed in response to the first and second downlink transmissions at least based on the second downlink assignment; and transmitting the acknowledgment bits in response to the first and second downlink transmissions in an uplink control channel associated with the second downlink assignment, wherein the first and the second transmit time interval lengths are different. ### Claim 2 (depends on 1) The method according to claim 1, wherein the first transmit time interval length is larger than the second transmit time interval length. ### Claim 3 (depends on 1) The method according to claim 1, wherein the second downlink assignment indicates a number of acknowledgment bits to be transmitted associated with downlink transmissions of the first transmit time interval length. ### Claim 4 (depends on 3) The method according to claim 3, wherein a first field in the second downlink assignment indicates the number of acknowledgment bits to be transmitted associated with downlink transmissions of the first transmit time interval length, and wherein a second field in the second downlink assignment indicates a number of acknowledgment bits to be transmitted associated with downlink transmissions of the second transmit time interval length. ### Claim 5 (depends on 3) The method according to claim 3, wherein the number of bits to be transmitted associated with downlink transmissions of the second transmit time interval length is zero. ### Claim 6 (depends on 1) The method according to claim 1, wherein the uplink control channel associated with the second downlink assignment contains a scheduling request. ### Claim 7 (depends on 6) The method according to claim 6, wherein the device is configured with a first and a second set of sounding reference signal resources, and wherein the method further comprises: transmitting a sounding reference signal on the first set of sounding reference signal resources if a symbol containing the sounding reference signal does not overlap with resources configured for scheduling request transmissions of a third transmit time interval duration; and transmitting a sounding reference signal on the second set of sounding reference signal resources if the symbol containing the sounding reference signal overlaps with resources configured for scheduling request transmissions of the third transmit time interval duration. ### Claim 8 (depends on 6) The method according to claim 6, further comprising transmitting a demodulation reference signal with a fixed cyclic shift in a symbol overlapping with scheduling request resources configured for scheduling request transmissions of a third transmit time interval duration. ### Claim 9 (depends on 8) The method according to claim 8, wherein the fixed cyclic shift is determined based on higher layer signaling that is higher than physical layer signaling. ### Claim 10 (depends on 1) The method according to claim 1, wherein the uplink control channel associated with the second downlink assignment comprises a first number of single carrier-frequency division multiple access symbols. ### Claim 11 (depends on 10) The method according to claim 10, wherein the first number of single carrier-frequency division multiple access symbols is seven, and wherein the acknowledgment bits in response to downlink transmissions of the first transmit time interval length are also transmitted in a second number of single carrier-frequency division multiple access symbols not overlapping in time with the first number of single carrier-frequency division multiple access symbols. ### Claim 12 An apparatus comprising a transceiver that receives a configuration from a network, the configuration enabling the apparatus to receive downlink transmissions with different transmit time interval lengths, receives a first downlink assignment indicating downlink resources for a first downlink transmission corresponding to a first transmit time interval length, receives a second downlink assignment indicating downlink resources for a second downlink transmission corresponding to a second transmit time interval length, and receives the first and the second downlink transmissions; and a controller coupled to the transceiver, where the controller determines a number of acknowledgment bits needed in response to the first and second downlink transmissions at least based on the second downlink assignment, wherein the transceiver transmits the acknowledgment bits in response to the first and second downlink transmissions in an uplink control channel associated with the second downlink assignment, and wherein the first and the second transmit time interval lengths are different. ### Claim 13 (depends on 12) The apparatus according to claim 12, wherein the first transmit time interval length is larger than the second transmit time interval length. ### Claim 14 (depends on 12) The apparatus according to claim 12, wherein the second downlink assignment indicates a number of acknowledgment bits to be transmitted associated with downlink transmissions of the first transmit time interval length. ### Claim 15 (depends on 14) The apparatus according to claim 14, wherein a first field in the second downlink assignment indicates the number of acknowledgment bits to be transmitted associated with downlink transmissions of the first transmit time interval length, and wherein a second field in the second downlink assignment indicates a number of acknowledgment bits to be transmitted associated with downlink transmissions of the second transmit time interval length. ### Claim 16 (depends on 14) The apparatus according to claim 14, wherein the number of bits to be transmitted associated with downlink transmissions of the second transmit time interval length is zero. ### Claim 17 (depends on 12) The apparatus according to claim 12, wherein the uplink control channel associated with the second downlink assignment contains a scheduling request. ### Claim 18 (depends on 17) The apparatus according to claim 17, wherein the apparatus is configured with a first and a second set of sounding reference signal resources, and wherein the transceiver: transmits a sounding reference signal on the first set of sounding reference signal resources if a symbol containing the sounding reference signal does not overlap with resources configured for scheduling request transmissions of a third transmit time interval duration, and transmits a sounding reference signal on the second set of sounding reference signal resources if the symbol containing the sounding reference signal overlaps with resources configured for scheduling request transmissions of the third transmit time interval duration. ### Claim 19 (depends on 17) The apparatus according to claim 17, wherein the transceiver transmits a demodulation reference signal with a fixed cyclic shift in a symbol overlapping with scheduling request resources configured for scheduling request transmissions of a third transmit time interval duration. ### Claim 20 (depends on 19) The apparatus according to claim 19, wherein the fixed cyclic shift is determined based on higher layer signaling that is higher than physical layer signaling.