# US 11,310,838 B2 · Uplink and downlink preemption indications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,838 B2 - Document ID: US11310838B2 - Status: Granted - Kind: B2 - Application number: 16/273,886 - Filed: 2019-02-12 - Published: 2019-08-15 - Granted: 2022-04-19 - Earliest claimed: 2018-02-14 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Chih Ping Li; Jing Jiang; Jing Sun; Wanshi Chen; Seyedkianoush Hosseini; Jay Kumar Sundararajan; Yi Huang - Web page: https://patentgrep.com/patent/US11310838B2 ## CPC - H04W 74/0841: {with collision treatment} - H04L 1/1607: Details of the supervisory signal - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - 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 72/569: {of the traffic information} - H04W 76/11: Allocation or use of connection identifiers - 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 Certain aspects of the present disclosure provide techniques and apparatus for signaling channel preemption indications that enable a user equipment (UE) of a first type to take one or more actions on resources that are re-allocated to an UE of a second type. An exemplary method generally includes determining that resources allocated for a scheduled transmission by a first user equipment (UE) of a first type overlaps with uplink channel resources allocated to a second UE of a second type. The method also includes signaling, based on the determination, an uplink preemption indication (ULPI), to the second UE, that identifies at least some of the overlapping resources. ## Claims ### Claim 1 A method for wireless communication by a first user equipment (UE), comprising: signaling an uplink signal to a base station (BS) via uplink channel resources allocated to the first UE of a first type; receiving an uplink preemption indication (ULPI) from the BS; and taking one or more actions based on one or more resources identified in the ULPI, wherein the one or more resources overlap with resources allocated for a scheduled transmission by a second UE of a second type. ### Claim 2 (depends on 1) The method of claim 1, wherein taking one or more actions comprises: reducing a transmit power during the scheduled transmission, suspending a transmission by the first UE during the scheduled transmission, applying the one or more actions to a resource that is adjacent to one or more resources identified in the ULPI, identifying a physical uplink control channel (PUCCH) resource in the one or more resources of the ULPI and signaling uplink control information via the PUCCH resource during the scheduled transmission, identifying a sounding reference signal (SRS) resource in the one or more resources of the ULPI and signaling the SRS during the scheduled transmission, identifying the SRS resource in the one or more resources and suspending transmission of the SRS during the scheduled transmission, or identifying activated, semi-persistently scheduled (SPS) resources in the one or more resources in the ULPI and rate matching a transmission around the activated SPS resources during the scheduled transmission. ### Claim 3 (depends on 1) The method of claim 1, wherein receiving the UPLI comprises receiving the ULPI periodically after one or more symbols or slots. ### Claim 4 (depends on 1) The method of claim 1, wherein the one or more resources identified in the ULPI are relative to a time offset, a time duration, and one or more resources of a reference uplink region. ### Claim 5 (depends on 1) The method of claim 1, wherein the ULPI is specific to one UE. ### Claim 6 (depends on 1) The method of claim 1, wherein the ULPI applies to a plurality of UEs. ### Claim 7 (depends on 1) The method of claim 1, wherein the ULPI comprises a bitmap identifying the one or more resources to be used by the second UE during the scheduled transmission. ### Claim 8 (depends on 7) The method of claim 7, wherein a bit of the bitmap corresponds to at least one of a wideband resource of a reference uplink region (RUR), a subband resource of the RUR, or one or more symbols of the RUR. ### Claim 9 (depends on 7) The method of claim 7, wherein the bitmap indicates to omit downlink resources adjacent to uplink resources in a time division duplex (TDD) configuration. ### Claim 10 (depends on 1) The method of claim 1, further comprising signaling uplink signals with a gap in the signals as indicated by the ULPI and preserving a phase continuity across the gap. ### Claim 11 (depends on 1) The method of claim 1, further comprising signaling uplink signals from the first UE with a gap in the signals as indicated by the ULPI, wherein the signals comprise at least one a demodulation reference signal (DMRS). ### Claim 12 (depends on 1) The method of claim 1, further comprising signaling uplink signals with a gap in the signals as indicated by the ULPI, wherein the gap punctures a demodulation reference signals (DMRS) expected to be received. ### Claim 13 (depends on 1) The method of claim 1, wherein the scheduled transmission uses semi-persistently scheduled (SPS) resources. ### Claim 14 (depends on 13) The method of claim 13, wherein the ULPI comprises a bitmap identifying one or more activated SPS resources, a status of the SPS resources, or a change of status of the SPS resources. ### Claim 15 (depends on 1) The method of claim 1, wherein the ULPI identifies resources corresponding to more than one component carrier or more than one bandwidth part (BWP). ### Claim 16 (depends on 1) The method of claim 1, wherein receiving the ULPI comprises receiving the ULPI via a different location of at least one of a search space or a control resource region than a downlink preemption indication (DLPI). ### Claim 17 (depends on 16) The method of claim 16, wherein the ULPI is signaled using a radio network temporary identifier (RNTI) distinct from a RNTI used to signal the DLPI. ### Claim 18 (depends on 1) The method of claim 1, wherein receiving the ULPI comprises receiving the ULPI using a same location of at least one of a search space or a control resource region and a same radio network temporary identifier (RNTI) as a downlink preemption indication (DLPI), wherein the ULPI includes an indication that it is for uplink preemption. ### Claim 19 A method for wireless communication by a base station (BS), comprising: determining that resources allocated for a scheduled transmission by a first user equipment (UE) of a first type overlap with uplink channel resources allocated to a second UE of a second type; and signaling, based on the determination, an uplink preemption indication (ULPI), to the second UE, that identifies at least some of the overlapping resources. ### Claim 20 (depends on 19) The method of claim 19, wherein the signaling the ULPI comprises signaling the ULPI periodically after one or more symbols or slots. ### Claim 21 (depends on 19) The method of claim 19, wherein the one or more resources identified in the ULPI are relative to a time offset, a time duration, and one or more resources of a reference uplink region. ### Claim 22 (depends on 19) The method of claim 19, wherein the ULPI is specific to one UE. ### Claim 23 (depends on 19) The method of claim 19, wherein the ULPI applies to a group of UEs. ### Claim 24 (depends on 19) The method of claim 19, wherein the ULPI comprises a bitmap identifying the one or more resources to be used during the scheduled transmission. ### Claim 25 (depends on 24) The method of claim 24, wherein a bit of the bitmap corresponds to a wideband resource of a reference uplink region (RUR), a subband resource of the RUR, or one or more symbols of the RUR. ### Claim 26 (depends on 24) The method of claim 24, wherein the bitmap indicates to omit downlink resources adjacent to uplink resources in a time division duplex (TDD) configuration. ### Claim 27 (depends on 19) The method of claim 19, further comprising: receiving uplink signals from the second UE with a gap in the signals as indicated by the ULPI; and decoding the received signals if the second UE is capable of preserving a phase continuity across the gap. ### Claim 28 (depends on 19) The method of claim 19, wherein the ULPI identifies resources corresponding to more than one component carrier or more than one bandwidth part (BWP). ### Claim 29 (depends on 19) The method of claim 19, wherein signaling the ULPI comprises signaling the ULPI via a different location of at least one of a search space or a control resource region than a downlink preemption indication (DLPI). ### Claim 30 (depends on 29) The method of claim 29, wherein the ULPI is signaled using a radio network temporary identifier (RNTI) distinct from a RNTI used to signal the DLPI. ### Claim 31 (depends on 19) The method of claim 19, wherein signaling the ULPI comprises signaling the ULPI using a same location of at least one of a search space or a control resource region and a same radio network temporary identifier (RNTI) as a downlink preemption indication (DLPI), wherein the ULPI includes an indication that it is for uplink preemption. ### Claim 32 (depends on 19) The method of claim 19, wherein the ULPI excludes at least one of one or more physical uplink control channel (PUCCH) resources, one or more sounding reference signal (SRS) resources, one or more physical random access channel (PRACH) resources, one or more physical broadcast channels (PBCH) resources, one or more demodulation reference signal (DMRS) resources, one or more synchronization signal block (SSB) resources, one or more phase-track reference signal (PTRS) resources, and one or more channel state information reference signal (CSIRS) resources. ### Claim 33 (depends on 19) The method of claim 19, further comprising: receiving uplink signals from the second UE during the scheduled transmission, wherein the received signals comprise a sounding reference signal (SRS); receiving the scheduled transmission from the first UE; decoding the scheduled transmission based at least in part on an effect of the received SRS on the scheduled transmission. ### Claim 34 (depends on 19) The method of claim 19, further comprising: receiving uplink signals from the second UE with a gap in the signals as indicated by the ULPI, wherein the received signals comprise at least one a demodulation reference signal (DMRS); and decoding the received signals based on the at least one DMRS. ### Claim 35 (depends on 19) The method of claim 19, further comprising: receiving uplink signals from the second UE with a gap in the signals as indicated by the ULPI; determining that the gap punctures a demodulation reference signals (DMRS) expected to be received; and determining not to decode at least a portion of the received signals based on the determination that the gap punctures the expected DMRS. ### Claim 36 (depends on 19) The method of claim 19, wherein the scheduled transmission uses semi-persistently scheduled (SPS) resources. ### Claim 37 (depends on 36) The method of claim 36, wherein the ULPI comprises a bitmap identifying one or more activated SPS resources, a status of the SPS resources, or a change of status of the SPS resources. ### Claim 38 An apparatus for wireless communication, comprising: a processing system configured to determine that resources allocated for a scheduled transmission by a first user equipment (UE) of a first type overlap with uplink channel resources allocated to a second UE of a second type; and an interface configured to output, based on the determination, an uplink preemption indication (ULPI), to the second UE, that identifies at least some of the overlapping resources. ### Claim 39 An apparatus for wireless communication, comprising: an interface configured to: output an uplink signal to a base station (BS) via uplink channel resources allocated to a first user equipment (UE) of a first type; and obtain an uplink preemption indication (ULPI) from the BS; and a processing system configured to take one or more actions based on one or more resources identified in the ULPI, wherein the one or more resources overlap with resources allocated for a scheduled transmission by a second UE of a second type. ### Claim 40 A method for wireless communication by a base station (BS), comprising: determining that resources allocated for a transmission to a first user equipment (UE) of a first type overlap with downlink channel resources allocated to a second UE of a second type; and signaling, based on the determination, a downlink preemption indication (DLPI), to the second UE, that comprises cross-carrier information and identifies at least some of the overlapping resources. ### Claim 41 (depends on 40) The method of claim 40, wherein the cross-carrier information indicates that the resources identified in the DLPI correspond to more than one component carrier. ### Claim 42 (depends on 40) The method of claim 40, wherein the DLPI comprises one or more cross-carrier bitmaps, wherein each bitmap applies to one or more UEs having a specific value of a carrier indicator field (CIF). ### Claim 43 (depends on 40) The method of claim 40, wherein the DLPI is exclusive to a specific value of a carrier indicator field (CIF) assigned to one or more UEs. ### Claim 44 (depends on 40) The method of claim 40, wherein the DLPI is exclusive to the first UE having a specific value of a carrier indicator field (CIF). ### Claim 45 (depends on 40) The method of claim 40, wherein signaling the DLPI comprises signaling the DLPI via a different location of at least one of a search space or a control resource region than an uplink preemption indication (ULPI). ### Claim 46 (depends on 45) The method of claim 45, wherein the DLPI is signaled using a radio network temporary identifier (RNTI) distinct from a RNTI used to signal the ULPI. ### Claim 47 (depends on 40) The method of claim 40, wherein signaling the DLPI comprises signaling the DLPI using a same location of at least one of a search space or a control resource region and a same radio network temporary identifier (RNTI) as an uplink preemption indication (ULPI), wherein the DLPI includes an indication that it is for downlink preemption. ### Claim 48 A method for wireless communication by a first user equipment (UE), comprising: receiving a downlink signal from a base station (BS) using one or more downlink channel resources allocated to the first UE of a first type; receiving a downlink preemption indication (DLPI) comprising cross-carrier information from the BS; and taking one or more actions based on one or more resources identified in the DLPI, wherein the one or more resources overlap with resources allocated for a scheduled transmission to a second UE of a second type. ### Claim 49 (depends on 48) The method of claim 48, wherein the cross-carrier information indicates that the resources identified in the DLPI correspond to more than one component carrier. ### Claim 50 (depends on 48) The method of claim 48, wherein the DLPI comprises one or more cross-carrier bitmaps, wherein each bitmap applies to one or more UEs having a specific value of a carrier indicator field (CIF). ### Claim 51 (depends on 48) The method of claim 48, wherein the DLPI is exclusive to a specific value of a carrier indicator field (CIF) assigned to one or more UEs. ### Claim 52 (depends on 48) The method of claim 48, wherein the DLPI is exclusive to the first UE having a specific value of a carrier indicator field (CIF). ### Claim 53 (depends on 48) The method of claim 48, wherein receiving the DLPI comprises receiving the DLPI via a different location of at least one of a search space or a control resource region than an uplink preemption indication (ULPI). ### Claim 54 (depends on 53) The method of claim 53, wherein the DLPI is signaled using a radio network temporary identifier (RNTI) distinct from a RNTI used to signal the ULPI. ### Claim 55 (depends on 54) The method of claim 54, wherein receiving the DLPI comprises receiving the DLPI using a same location of at least one of a search space or a control resource region and a same radio network temporary identifier (RNTI) as an uplink preemption indication (ULPI), wherein the DLPI includes an indication that it is for downlink preemption. ### Claim 56 An apparatus for wireless communication, comprising: a processing system configured to determine that resources allocated for a transmission to a first user equipment (UE) of a first type overlap with downlink channel resources allocated to a second UE of a second type; and an interface configured to output, based on the determination, a downlink preemption indication (DLPI), to the second UE, that comprises cross-carrier information and identifies at least some of the overlapping resources. ### Claim 57 An apparatus for wireless communication, comprising: an interface configured to: obtain a downlink signal from a base station (BS) using one or more downlink channel resources allocated to a first user equipment (UE) of a first type; and obtain a downlink preemption indication (DLPI) comprising cross-carrier information from the BS; and a processing system configured to take one or more actions based on one or more resources identified in the DLPI, wherein the one or more resources overlap with resources allocated for a scheduled transmission to a second UE of a second type.