# US 12,763,906 B2 · Selecting a phase tracking reference signal demodulation reference signal association bitfield length > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,763,906 B2 - Document ID: US12763906B2 - Status: Granted - Kind: B2 - Application number: 18/592,080 - Filed: 2024-02-29 - Published: 2024-10-03 - Granted: 2026-10-13 - Earliest claimed: 2023-03-27 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Yitao Chen; Mostafa Khoshnevisan - Web page: https://patentgrep.com/patent/US12763906B2 ## CPC - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04W 72/1268: of uplink data flows - H04W 72/232: the control data signalling from the physical layer, e.g. DCI signalling - H04W 76/20: Manipulation of established connections - 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 Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may derive a first potential length for a phase tracking reference signal demodulation reference signal (PTRS-DMRS) association bitfield based at least in part on a simultaneous transmissions with multiple panels (STxMP) configuration. The network node may derive a second potential length for the PTRS-DMRS association bitfield based at least in part on a single transmit receive point (sTRP) configuration. The network node may select a finalized length based at least in part on the first potential length and the second potential length. The network node may indicate a relationship between a PTRS port and a DMRS port based at least in part on transmitting downlink control information (DCI) using a DCI configuration that is associated with the finalized length of the PTRS-DMRS association bitfield. Numerous other aspects are described. ## Claims ### Claim 1 An apparatus for wireless communication at a network node, comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the network node to: derive a first potential length for a phase tracking reference signal demodulation reference signal (PTRS-DMRS) association bitfield based at least in part on a simultaneous transmissions with multiple panels (STxMP) configuration; derive a second potential length for the PTRS-DMRS association bitfield based at least in part on a single transmit receive point (sTRP) configuration; select a finalized length for the PTRS-DMRS association bitfield as a maximum length of the first potential length and the second potential length; and transmit downlink control information (DCI) using a DCI configuration that is associated with the finalized length of the PTRS-DMRS association bitfield. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the one or more processors, to cause the network node to transmit the DCI, are configured to cause the network node to: include the PTRS-DMRS association bitfield in the DCI based at least in part on the finalized length; and zero-pad any unused bit in the PTRS-DMRS association bitfield. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein a transmission configuration associated with the PTRS-DMRS association bitfield includes at least two signaling reference signal (SRS) resource sets, wherein the transmission configuration includes a usage field that is set to at least one of: a codebook usage type or a non-codebook usage type, wherein the transmission configuration indicates that the STxMP configuration comprises a spatial division multiplexing (SDM) mode, wherein the transmission configuration includes a configured uplink phase tracking reference signal configuration, and wherein the transmission configuration includes cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) being enabled. ### Claim 4 (depends on 3) The apparatus of claim 3, wherein the one or more processors, to cause the network node to derive the first potential length, are configured to cause the network node to: derive the first potential length based at least in part on at least one of: a configured maximum rank associated with the SDM mode, or a configured maximum number of PTRS ports associated with the SDM mode. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein the configured maximum rank associated with the SDM mode is set to one, wherein the configured maximum number of PTRS ports associated with the SDM mode is set to two, and wherein the one or more processors, to cause the network node to derive the first potential length, are configured to cause the network node to: derive the first potential length as zero based at least in part on: the configured maximum rank associated with the SDM mode being set to one; and the configured maximum number of PTRS ports associated with the SDM mode being set to two. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein a transmission configuration associated with the PTRS-DMRS association bitfield includes at least two signaling reference signal (SRS) resource sets, wherein the transmission configuration includes a usage field that is set to at least one of: a codebook usage type or a non-codebook usage type, wherein the transmission configuration indicates that the STxMP configuration comprises a single frequency network (SFN) mode, wherein the transmission configuration includes a configured uplink phase tracking reference signal uplink configuration, and wherein the transmission configuration includes cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) being enabled. ### Claim 7 (depends on 6) The apparatus of claim 6, wherein the one or more processors, to cause the network node to derive the first potential length, are configured to cause the network node to: derive the first potential length based at least in part on a configured maximum rank associated with the SFN mode. ### Claim 8 (depends on 7) The apparatus of claim 7, wherein the configured maximum rank associated with the SFN mode is set to one, and wherein the one or more processors, to cause the network node to derive the first potential length, are configured to cause the network node to: derive that the first potential length is zero based at least in part on the configured maximum rank associated with the SFN mode being set to one. ### Claim 9 (depends on 7) The apparatus of claim 7, wherein the configured maximum rank associated with the SFN mode is set to a value that is greater than one, and wherein the one or more processors, to cause the network node to derive the first potential length, are configured to cause the network node to: derive the first potential length as two based at least in part on the value being greater than one. ### Claim 10 An apparatus for wireless communication at a user equipment (UE), comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the UE to: derive a first potential length for a phase tracking reference signal demodulation reference signal (PTRS-DMRS) association bitfield based at least in part on a simultaneous transmissions with multiple panels (STxMP) configuration; derive a second potential length for the PTRS-DMRS association bitfield based at least in part on a single transmit receive point (sTRP) configuration; select a finalized length for the PTRS-DMRS association bitfield as a maximum length of the first potential length and the second potential length; and communicate with a network node based at least in part on recovering information from downlink control information (DCI) based at least in part on the finalized length of the PTRS-DMRS association bitfield. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein the one or more processors are further configured to cause the UE to: extract, from the DCI, a value from the PTRS-DMRS association bitfield based at least in part on the finalized length; and determine the information based at least in part on the value. ### Claim 12 (depends on 10) The apparatus of claim 10, wherein a transmission configuration associated with the PTRS-DMRS association bitfield includes at least two signaling reference signal (SRS) resource sets, wherein the transmission configuration includes a usage field that is set to at least one of: a codebook usage type or a non-codebook usage type, wherein the transmission configuration indicates that the STxMP configuration comprises a spatial division multiplexing (SDM) mode, wherein the transmission configuration includes a configured uplink phase tracking reference signal uplink configuration, and wherein the transmission configuration includes cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) being enabled. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the one or more processors, to cause the UE to derive the first potential length, are configured to cause the UE to: derive the first potential length based at least in part on at least one of: a configured maximum rank associated with the SDM mode, or a configured maximum number of PTRS ports associated with the SDM mode. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the configured maximum rank associated with the SDM mode is set to one, wherein the configured maximum number of PTRS ports is set to two, and wherein the one or more processors, to cause the UE to derive the first potential length, are configured to cause the UE to: derive the first potential length as zero based at least in part on: the configured maximum rank associated with the SDM mode being set to one; and the configured maximum number of PTRS ports associated with the SDM mode being set to two. ### Claim 15 (depends on 10) The apparatus of claim 10, wherein a transmission configuration associated with the PTRS-DMRS association bitfield includes at least two signaling reference signal (SRS) resource sets, wherein the transmission configuration includes a usage field that is set to at least one of: a codebook usage type or a non-codebook usage type, wherein the transmission configuration indicates that the STxMP configuration comprises a single frequency network (SFN) mode, wherein the transmission configuration includes a configured uplink phase tracking reference signal uplink configuration, and wherein the transmission configuration includes cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) being enabled. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the one or more processors, to cause the UE to derive the first potential length, are configured to cause the UE to: derive the first potential length based at least in part on a configured maximum rank associated with the SFN mode. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the configured maximum rank associated with the SFN mode is set to one, and wherein the one or more processors, to cause the UE to derive the first potential length, are configured to cause the UE to: derive that the first potential length is zero based at least in part on the configured maximum rank associated with the SFN mode being set to one. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the configured maximum rank associated with the SFN mode is set to a value that is greater than one, and wherein the one or more processors, to cause the UE to derive the first potential length, are configured to cause the UE to: derive the first potential length as two based at least in part on the value being greater than one. ### Claim 19 A method of wireless communication performed by a network node, comprising: deriving a first potential length for a phase tracking reference signal demodulation reference signal (PTRS-DMRS) association bitfield based at least in part on a simultaneous transmissions with multiple panels (STxMP) configuration; deriving a second potential length for the PTRS-DMRS association bitfield based at least in part on a single transmit receive point (sTRP) configuration; selecting a finalized length for the PTRS-DMRS association bitfield based at least in part on the first potential length and the second potential length, the selecting comprising: selecting, as the finalized length, a maximum length of the first potential length and the second potential length; and transmitting downlink control information (DCI) using a DCI configuration that is associated with the finalized length of the PTRS-DMRS association bitfield. ### Claim 20 (depends on 19) The method of claim 19, wherein transmitting the DCI comprises: including the PTRS-DMRS association bitfield in the DCI based at least in part on the finalized length; and zero-padding any unused bit in the PTRS-DMRS association bitfield.