# US 11,310,023 B2 · Non-uniform demodulation reference signal bundling > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,023 B2 - Document ID: US11310023B2 - Status: Granted - Kind: B2 - Application number: 16/889,534 - Filed: 2020-06-01 - Published: 2020-12-10 - Granted: 2022-04-19 - Earliest claimed: 2020-06-01 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Alexandros Manolakos; Joseph Binamira Soriaga; Wanshi Chen - Web page: https://patentgrep.com/patent/US11310023B2 ## CPC - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0082: {at predetermined intervals} - H04L 5/0092: {Indication of how the channel is divided} - H04L 5/10: with dynamo-electric generation of carriers; with mechanical filters or demodulators - H04L 25/0204: {of multiple channels} - H04L 25/0224: {using sounding signals} - H04L 25/0226: {sounding signals per se} - H04L 27/2613: {Structure of the reference signals} - H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC] - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 72/53: based on regulatory allocation policies - H04W 80/02: Data link layer protocols - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - 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 Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for signaling a semi-static configuration for demodulation reference signal (DMRS) bundling across non-uniform bundles of transmission time intervals (TTIs). A base station may transmit control signaling to a user equipment (UE) that schedules resources for DMRSs and associated data channels across the TTIs. For example, the base station may transmit a bundling configuration to the UE that may configure a bundling sequence defining an order for the bundles and a number of TTIs for each bundle. Based on the control signaling, the UE may determine a reference signal bundling pattern for receiving the DMRSs and the associated data channels, where the reference signal bundling pattern may indicate the bundling sequence. The UE may accordingly receive the DMRSs and the associated data channels and perform channel estimation on the data channels. ## Claims ### Claim 1 A method for wireless communication at a user equipment (UE), comprising: receiving control signaling that schedules resources for receiving a plurality of demodulation reference signals and a plurality of associated data channels across a plurality of transmission time intervals (TTIs); determining a reference signal bundling pattern for receiving the plurality of demodulation reference signals and the plurality of associated data channels according to the control signaling, wherein the reference signal bundling pattern indicates that one or more of the plurality of TTIs are bundled as a plurality of reference signal bundled TTIs, at least two of the plurality of reference signal bundled TTIs having different durations; receiving the plurality of demodulation reference signals and the plurality of associated data channels according to the reference signal bundling pattern; and performing channel estimation based at least in part on the received plurality of demodulation reference signals and the plurality of associated data channels. ### Claim 2 (depends on 1) The method of claim 1, further comprising: demodulating the plurality of associated data channels based at least in part on performing the channel estimation using the received plurality of demodulation reference signals. ### Claim 3 (depends on 1) The method of claim 1, further comprising: determining a reference time at which to receive an initial demodulation reference signal of the plurality of demodulation reference signals during one of the plurality of reference signal bundled TTIs according to the reference signal bundling pattern. ### Claim 4 (depends on 3) The method of claim 3, further comprising: transmitting a sounding reference signal (SRS) during a first TTI, wherein the reference time is determined to be within a second TTI, the second TTI following the first TTI. ### Claim 5 (depends on 4) The method of claim 4, wherein the first TTI immediately follows the second TTI, and the first TTI comprises a latest transmission of the SRS. ### Claim 6 (depends on 4) The method of claim 4, wherein the SRS is associated with a use case of antenna switching. ### Claim 7 (depends on 4) The method of claim 4, further comprising: receiving an indication of an offset, wherein a duration of the offset begins following a latest SRS, and the reference time is determined to be a time at an end of the duration of the offset and within the second TTI. ### Claim 8 (depends on 4) The method of claim 4, further comprising: receiving an indication of an offset, wherein a duration of the offset begins at a beginning of the second TTI, and the reference time is determined to be a time at an end of the duration of the offset and within the second TTI. ### Claim 9 (depends on 4) The method of claim 4, further comprising: receiving an initial data transmission after transmitting the SRS, wherein the reference time is determined to be a time following the initial data transmission. ### Claim 10 (depends on 9) The method of claim 9, wherein the initial data transmission is received in a physical downlink shared channel (PDSCH). ### Claim 11 (depends on 4) The method of claim 4, wherein the control signaling comprises a first reference signal bundling pattern configuration and a second reference signal bundling pattern configuration, the method further comprising: receiving a trigger message in a physical downlink shared channel (PDSCH) after transmitting the SRS, and the reference signal bundling pattern is determined according to the first reference signal bundling pattern configuration or the second reference signal bundling pattern configuration based at least in part on the trigger message. ### Claim 12 (depends on 11) The method of claim 11, wherein the trigger message is received in downlink control information in the PDSCH. ### Claim 13 (depends on 3) The method of claim 3, wherein the reference time is determined based at least in part on a boundary of a set of one or more TTIs of the plurality of TTIs, and wherein the boundary of the set of one or more TTIs comprises a frame boundary. ### Claim 14 (depends on 3) The method of claim 3, further comprising: receiving a trigger message, wherein the reference time is determined based at least in part on the trigger message. ### Claim 15 (depends on 14) The method of claim 14, wherein the trigger message further comprises an offset, and the reference time is at a time following the offset, and wherein the trigger message is received in a medium access control (MAC) control element (CE). ### Claim 16 (depends on 1) The method of claim 1, wherein the reference signal bundling pattern indicates that the UE is to assume a same precoding for receiving transmissions in each bundled TTI of the plurality of reference signal bundled TTIs. ### Claim 17 (depends on 1) The method of claim 1, further comprising: transmitting a capability message indicating a capability of the UE to support the reference signal bundling pattern for receiving the plurality of demodulation reference signals. ### Claim 18 (depends on 1) The method of claim 1, wherein the reference signal bundling pattern is based at least in part on a type of wireless communications system comprising the UE. ### Claim 19 (depends on 18) The method of claim 18, wherein the type of wireless communications system is one or more of enhanced mobile broadband or ultra-reliable, low latency communications. ### Claim 20 (depends on 1) The method of claim 1, wherein the reference signal bundling pattern is based at least in part on a channel type in which the plurality of demodulation reference signals are received. ### Claim 21 (depends on 20) The method of claim 20, wherein the channel type comprises one of a first type of physical downlink share channel (PDSCH) or a second type of PDSCH, and wherein the first type of PDSCH is associated with receiving an initial demodulation reference signal of the plurality of demodulation reference signals based at least in part on a starting time of a set of one or more TTIs, and the second type of PDSCH is associated with receiving the initial demodulation reference signal based at least in part on a starting time of an allocation for the scheduled resources. ### Claim 22 (depends on 1) The method of claim 1, further comprising: transmitting a sounding reference signal (SRS); and determining that the SRS was not successfully received, wherein the reference signal bundling pattern is based at least in part on determining that the SRS was not successfully received. ### Claim 23 (depends on 1) The method of claim 1, further comprising: transmitting a sounding reference signal (SRS) on a first set of physical resource blocks (PRBs), each of the PRBs of the first set of PRBs corresponding to respective PRBs of a second set of PRBs of the plurality of associated data channels, wherein the reference signal bundling pattern applies to the second set of PRBs of the plurality of associated data channels corresponding to the first set of PRBs, and not to a third set of PRBs of the plurality of associated data channels not corresponding to the first set of PRBs. ### Claim 24 (depends on 1) The method of claim 1, wherein the plurality of reference signal bundled TTIs comprises a first reference signal bundled TTI and a second reference signal bundled TTI, the first reference signal bundled TTI comprising a first number of TTIs and the second reference signal bundled TTI comprising a second number of TTIs, and wherein the first number of TTIs is different from the second number of TTIs. ### Claim 25 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: receive control signaling that schedules resources for receiving a plurality of demodulation reference signals and a plurality of associated data channels across a plurality of transmission time intervals (TTIs); determine a reference signal bundling pattern for receiving the plurality of demodulation reference signals and the plurality of associated data channels according to the control signaling, wherein the reference signal bundling pattern indicates that one or more of the plurality of TTIs are bundled as a plurality of reference signal bundled TTIs, at least two of the plurality of reference signal bundled TTIs having different durations; receive the plurality of demodulation reference signals and the plurality of associated data channels according to the reference signal bundling pattern; and perform channel estimation based at least in part on the received plurality of demodulation reference signals and the plurality of associated data channels. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the instructions are further executable by the processor to cause the apparatus to: demodulate the plurality of associated data channels based at least in part on performing the channel estimation using the received plurality of demodulation reference signals. ### Claim 27 (depends on 25) The apparatus of claim 25, wherein the reference signal bundling pattern indicates that the UE is to assume a same precoding for receiving transmissions in each bundled TTI of the plurality of reference signal bundled TTIs. ### Claim 28 (depends on 25) The apparatus of claim 25, wherein the reference signal bundling pattern is based at least in part on a channel type in which the plurality of demodulation reference signals are received. ### Claim 29 An apparatus for wireless communication at a user equipment (UE), comprising: means for receiving control signaling that schedules resources for receiving a plurality of demodulation reference signals and a plurality of associated data channels across a plurality of transmission time intervals (TTIs); means for determining a reference signal bundling pattern for receiving the plurality of demodulation reference signals and the plurality of associated data channels according to the control signaling, wherein the reference signal bundling pattern indicates that one or more of the plurality of TTIs are bundled as a plurality of reference signal bundled TTIs, at least two of the plurality of reference signal bundled TTIs having different durations; means for receiving the plurality of demodulation reference signals and the plurality of associated data channels according to the reference signal bundling pattern; and means for performing channel estimation based at least in part on the received plurality of demodulation reference signals and the plurality of associated data channels. ### Claim 30 A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to: receive control signaling that schedules resources for receiving a plurality of demodulation reference signals and a plurality of associated data channels across a plurality of transmission time intervals (TTIs); determine a reference signal bundling pattern for receiving the plurality of demodulation reference signals and the plurality of associated data channels according to the control signaling, wherein the reference signal bundling pattern indicates that one or more of the plurality of TTIs are bundled as a plurality of reference signal bundled TTIs, at least two of the plurality of reference signal bundled TTIs having different durations; receive the plurality of demodulation reference signals and the plurality of associated data channels according to the reference signal bundling pattern; and perform channel estimation based at least in part on the received plurality of demodulation reference signals and the plurality of associated data channels.