# US 2019/0320448 A1 · Preemption indication for low latency communications on dynamically allocated resources > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0320448 A1 - Document ID: US20190320448A1 - Status: Published application - Kind: A1 - Application number: 16/381,277 - Filed: 2019-04-11 - Published: 2019-10-17 - Earliest claimed: 2018-04-13 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Seyed Ali Akbar Fakoorian; Jing Sun; Xiaoxia Zhang; Chih-Hao Liu; Srinivas Yerramalli - Web page: https://patentgrep.com/patent/US20190320448A1 ## CPC - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/569: {of the traffic information} - H04W 52/36: with a discrete range or set of values, e.g. step size, ramping or offsets - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Some wireless communications systems may support different types of communications between base stations and user equipment (UEs), such as mobile broadband (MBB) communications and low latency communications. Low latency communications may be associated with bursty and unpredictable transmissions. As described herein, to facilitate low latency communications and limit the latency associated with waiting on appropriate resources for transmitting low latency data, a base station may schedule downlink low latency transmissions on uplink resources or uplink low latency transmissions on downlink resources. Further, to limit the latency associated with scheduling low latency communications, a base station may be configured with a carrier for transmitting preemption indications (PIs) to one or more UEs to reassign resources for low latency communications. Similarly, in some cases, a UE may be configured with a carrier to transmit scheduling requests (SRs) to request resources for low latency communications. ## Claims ### Claim 1 A method for wireless communication at a user equipment (UE), comprising: identifying that a transmission time interval (TTI) is allocated for a first type of communications in a first carrier; receiving, in a second carrier, a control message indicating that a portion of the TTI is assigned for a second type of communications in a downlink or uplink direction in the first carrier; determining that the second type of communications is to preempt the first type of communications in the portion of the TTI based at least in part on receiving the control message; and communicating during the TTI based at least in part on receiving the control message and on the determination. ### Claim 2 (depends on 1) The method of claim 1, wherein the UE is operating in an ultra-reliable low latency mode, and wherein communicating during the TTI based at least in part on receiving the control message and on the determination comprises: receiving low latency downlink signals or transmitting low latency uplink signals during the portion of the TTI based at least in part on receiving the control message and on the determination. ### Claim 3 (depends on 1) The method of claim 1, wherein the UE is operating in a mobile broadband (MBB) mode, and wherein communicating during the TTI based at least in part on receiving the control message and on the determination comprises: canceling an MBB uplink transmission during the portion of the TTI based at least in part on receiving the control message and on the determination. ### Claim 4 (depends on 1) The method of claim 1, wherein the UE is operating in an ultra-reliable low latency mode, and wherein communicating during the TTI based at least in part on receiving the control message and on the determination comprises: receiving low latency downlink signals transmitted during the portion of the TTI with a first transmit power or transmitting low latency uplink signals during the portion of the TTI with the first transmit power, the first transmit power being greater than a second transmit power used by the UE or another UE operating in a mobile broadband (MBB) mode to transmit MBB uplink signals during the portion of the TTI. ### Claim 5 (depends on 1) The method of claim 1, wherein the UE is operating in a mobile broadband (MBB) mode, and wherein communicating during the TTI based at least in part on receiving the control message and on the determination comprises: transmitting MBB uplink signals during the portion of the TTI with a first transmit power, the first transmit power being lower than a second transmit power used by a base station to transmit low latency downlink signals during the portion of the TTI to the UE or another UE operating in an ultra-reliable low latency mode or the second transmit power used by the UE or another UE to transmit low latency uplink signals during the portion of the TTI to the base station. ### Claim 6 (depends on 1) The method of claim 1, further comprising: monitoring the second carrier during control message monitoring occasions for the control message. ### Claim 7 (depends on 6) The method of claim 6, wherein the control message monitoring occasions are periodic, and a periodicity of the control message monitoring occasions is configured via radio resource control (RRC) signaling. ### Claim 8 (depends on 1) The method of claim 1, further comprising: monitoring the first carrier during control message monitoring occasions for the control message when the control message monitoring occasions coincide with downlink symbols of the first carrier; and monitoring the second carrier during control message monitoring occasions for the control message when the control message monitoring occasions coincide with uplink symbols of the first carrier. ### Claim 9 (depends on 8) The method of claim 8, wherein the control message monitoring occasions are periodic, and a periodicity of the control message monitoring occasions is configured via radio resource control (RRC) signaling. ### Claim 10 (depends on 1) The method of claim 1, wherein the control message further indicates resources of the first carrier that are assigned for the second type of communications. ### Claim 11 (depends on 1) The method of claim 1, further comprising: receiving a second control message in the first carrier that indicates resources of the first carrier that are assigned for the second type of communications. ### Claim 12 (depends on 11) The method of claim 11, wherein the second control message is received in a physical downlink control channel (PDCCH). ### Claim 13 (depends on 1) The method of claim 1, further comprising: receiving a slot format indication (SFI) indicating that the TTI is configured for communications in the downlink or uplink direction, wherein a downlink direction configuration indicated by the control message overrides an uplink direction configuration indicated by the SFI during the portion of the TTI. ### Claim 14 (depends on 1) The method of claim 1, wherein the first carrier comprises a wideband carrier, and the second carrier comprises a narrowband carrier, and the UE is configured to monitor the narrowband carrier for control messages indicating that resources of the first carrier are allocated for the second type of communications. ### Claim 15 (depends on 1) The method of claim 1, wherein the first carrier comprises a first time division duplex (TDD) carrier, and the second carrier comprises a second TDD carrier. ### Claim 16 (depends on 1) The method of claim 1, wherein the control message comprises a preemption indication (PI). ### Claim 17 (depends on 1) The method of claim 1, wherein the first type of communications comprises mobile broadband (MBB) communications and the second type of communications comprises ultra-reliable low latency communications. ### Claim 18 (depends on 1) The method of claim 1, further comprising: transmitting, in the first carrier or in the second carrier, a scheduling request (SR) to request resources on which to transmit uplink signals associated with the second type of communications in the first carrier, wherein the control message indicating that the portion of the TTI is assigned for the second type of communications in the uplink direction in the first carrier is received based at least in part on transmitting the SR. ### Claim 19 A method for wireless communication at a base station, comprising: identifying that a transmission time interval (TTI) is allocated for a first type of communications with a first user equipment (UE) in a first carrier; identifying downlink signals associated with a second type of communications to transmit to a second UE in the first carrier or that uplink signals associated with the second type of communications are to be received from the second UE in the first carrier; transmitting, in a second carrier, a control message indicating that a portion of the TTI is assigned for transmitting the downlink signals associated with the second type of communications or receiving the uplink signals associated with the second type of communications in the first carrier; determining that the second type of communications is to preempt the first type of communications in the portion of the TTI based at least in part on transmitting the control message; and communicating during the TTI based at least in part on transmitting the control message and on the determination. ### Claim 20 (depends on 19) The method of claim 19, wherein communicating during the TTI based at least in part on transmitting the control message and on the determination comprises: transmitting the downlink signals associated with the second type of communications to the second UE or receiving the uplink signals associated with the second type of communications from the second UE during the portion of the TTI based at least in part on transmitting the control message and on the determination. ### Claim 21 (depends on 19) The method of claim 19, wherein communicating during the TTI based at least in part on transmitting the control message and on the determination comprises: determining that an uplink transmission from the first UE during the portion of the TTI is canceled based at least in part on transmitting the control message; and avoiding monitoring for the uplink transmission based at least in part on determining that the uplink transmission is canceled. ### Claim 22 (depends on 19) The method of claim 19, wherein communicating during the TTI based at least in part on transmitting the control message and on the determination comprises: receiving other uplink signals associated with the first type of communications transmitted by the first UE with a first transmit power during the portion of the TTI based at least in part on transmitting the control message; and transmitting the downlink signals associated with the second type of communications to the second UE during the portion of the TTI with a second transmit power or receiving the uplink signals associated with the second type of communications from the second UE during the portion of the TTI with the second transmit power based at least in part on transmitting the control message, the second transmit power being greater than the first transmit power. ### Claim 23 (depends on 19) The method of claim 19, wherein the control message is transmitted in one of a plurality of control message monitoring occasions in the first carrier or the second carrier. ### Claim 24 (depends on 19) The method of claim 19, wherein the control message further indicates resources of the first carrier that are assigned for transmitting the downlink signals associated with the second type of communications or receiving the uplink signals associated with the second type of communications. ### Claim 25 (depends on 19) The method of claim 19, further comprising: transmitting a second control message in the first carrier that indicates resources of the first carrier that are assigned for transmitting the downlink signals associated with the second type of communications or receiving the uplink signals associated with the second type of communications. ### Claim 26 (depends on 25) The method of claim 25, wherein the second control message is transmitted in a physical downlink control channel (PDCCH). ### Claim 27 (depends on 19) The method of claim 19, further comprising: transmitting a slot format indication (SFI) indicating that the TTI is configured for communications in the downlink or uplink direction, wherein a downlink direction configuration indicated by the control message overrides an uplink direction configuration indicated by the SFI during the portion of the TTI. ### Claim 28 (depends on 19) The method of claim 19, wherein: the first UE is configured to operate in a mobile broadband (MBB) mode and the first type of communications comprises mobile broadband (MBB) communications; and the second UE is configured to operate in an ultra-reliable low latency mode and the second type of communications comprises ultra-reliable low latency communications. ### Claim 29 An apparatus for wireless communication at a user equipment (UE), comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: identify that a transmission time interval (TTI) is allocated for a first type of communications in a first carrier; receive, in a second carrier, a control message indicating that a portion of the TTI is assigned for a second type of communications in a downlink or uplink direction in the first carrier; determine that the second type of communications is to preempt the first type of communications in the portion of the TTI based at least in part on receiving the control message; and communicate during the TTI based at least in part on receiving the control message and on the determination. ### Claim 30 An apparatus for wireless communication at a base station, comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: identify that a transmission time interval (TTI) is allocated for a first type of communications with a first user equipment (UE) in a first carrier; identify downlink signals associated with a second type of communications to transmit to a second UE in the first carrier or that uplink signals associated with the second type of communications are to be received from the second UE in the first carrier; transmit, in a second carrier, a control message indicating that a portion of the TTI is assigned for transmitting the downlink signals associated with the second type of communications or receiving the uplink signals associated with the second type of communications in the first carrier; determine that the second type of communications is to preempt the first type of communications in the portion of the TTI based at least in part on transmitting the control message; and communicate during the TTI based at least in part on transmitting the control message and on the determination.