# US 12,771,511 B2 · Details for 8 ports SRS mapping to multiple OFDM symbols > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,771,511 B2 - Document ID: US12771511B2 - Status: Granted - Kind: B2 - Application number: 18/520,038 - Filed: 2023-11-27 - Published: 2024-07-04 - Granted: 2026-10-20 - Earliest claimed: 2023-01-04 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Yi Huang; Yu Zhang - Web page: https://patentgrep.com/patent/US12771511B2 ## CPC - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method for wireless communication at a user equipment (UE) and related apparatus are provided. In the method, the UE sequentially maps a first number of Sounding Reference Signal (SRS) ports to a second number of orthogonal frequency-division multiplexing (OFDM) symbols. The first number and the second number are greater than one. The UE further transmits an SRS from the first number of SRS ports over the second number of OFDM symbols based on the mapping. ## Claims ### Claim 1 An apparatus for wireless communication at a user equipment (UE), comprising: at least one memory; and at least one processor coupled to the at least one memory and, based at least in part on information stored in the at least one memory, the at least one processor is configured to cause the UE to: sequentially map, based on a repetition factor, a first number of Sounding Reference Signal (SRS) ports to a second number of orthogonal frequency-division multiplexing (OFDM) symbols, the first number and the second number each being greater than one, wherein for each OFDM symbol of the second number of OFDM symbols, a respective subset of SRS ports of the first number of SRS ports is mapped to the OFDM symbol, wherein a number of SRS ports in the respective subset of SRS ports is less than the first number and is based on the repetition factor; and transmit an SRS from the first number of SRS ports over the second number of OFDM symbols. ### Claim 2 (depends on 1) The apparatus of claim 1, further comprising a transceiver coupled to the at least one processor, wherein, to transmit the SRS, the at least one processor is configured to cause the UE to transmit the SRS via the transceiver, and wherein the SRS ports is based on a codebook, wherein a first subset of the SRS ports are coherent and a second subset of the SRS ports are coherent, the first subset of the SRS ports being incoherent with the second subset of the SRS ports. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein, to sequentially map the first number of SRS ports to the second number of OFDM symbols, the at least one processor is configured to cause the UE to: map the first subset of the SRS ports to a first contiguous subset of the OFDM symbols; and map the second subset of the SRS ports to a second contiguous subset of the OFDM symbols. ### Claim 4 (depends on 3) The apparatus of claim 3, wherein the first contiguous subset of the OFDM symbols is contiguous or non-contiguous with the second contiguous subset of the OFDM symbols. ### Claim 5 (depends on 2) The apparatus of claim 2, wherein the first number of SRS ports are mapped to the second number of OFDM symbols within a same slot or sub-slot based on the first number of SRS ports being a coherent SRS port group. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein, to sequentially map the first number of SRS ports to the second number of OFDM symbols, the at least one processor is further configured to cause the UE to: map non-coherent SRS port groups in the first number of SRS ports to different slots or sub-slots. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein a usage of the first number of SRS ports is for codebook-based physical uplink shared channel (PUSCH), and codebooks for the first number of SRS ports are for an antenna switching scheme, wherein, to sequentially map the first number of SRS ports to the second number of OFDM symbols, the at least one processor is configured to cause the UE to: map the first number of SRS ports to contiguous or non-contiguous symbols based on the antenna switching scheme. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein a usage of the first number of SRS ports is for codebook-based physical uplink shared channel (PUSCH), and codebooks for the first number of SRS ports are for an antenna switching scheme, wherein, to sequentially map the first number of SRS ports to the second number of OFDM symbols, the at least one processor is configured to cause the UE to: map the first number of SRS ports to a same slot, a same sub-slot, different slots, or different sub-slots based on the antenna switching scheme. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein, to sequentially map the first number of SRS ports to the second number of OFDM symbols, the at least one processor is configured to cause the UE to: map the first number of SRS ports to a subset of the second number of symbols, the subset of the second number of symbols being based on the second number of symbols divided by the repetition factor, wherein a mapping from the first number of SRS ports to the subset of the second number of symbols is repeated on the second number of symbols by a time specified by the repetition factor. ### Claim 10 (depends on 1) The apparatus of claim 1, wherein, to sequentially map the first number of SRS ports to the second number of OFDM symbols, the at least one processor is configured to cause the UE to: map a subset of the first number of SRS ports to a single symbol, the subset being based on the repetition factor. ### Claim 11 (depends on 1) The apparatus of claim 1, wherein the at least one processor is further configured to cause the UE to: associate a physical uplink shared channel (PUSCH) transmission with a most recent transmission of an SRS resource indicated by an SRS resource indicator (SRI) that does not include a skipped transmission of at least one SRS port of the first number of SRS ports. ### Claim 12 (depends on 1) The apparatus of claim 1, wherein the at least one processor is further configured to cause the UE to: determine whether to use a partial SRS transmission for a physical uplink shared channel (PUSCH) transmission based on one or more of SRS usage, a codebook, or a coherency. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the SRS usage of the first number of SRS ports is for a codebook-based PUSCH, and the first number of SRS ports include a third number of SRS ports having codebooks that are coherent, and the at least one processor is further configured to cause the UE to: in response to a drop of at least one SRS port of the first number of SRS ports in communication with a network entity, drop all the first number of SRS ports. ### Claim 14 (depends on 12) The apparatus of claim 12, wherein a usage of the first number of SRS ports is for codebook-based physical uplink shared channel (PUSCH), and the first number of SRS ports include a fourth number of SRS ports having codebooks that are non-coherent, and the at least one processor is further configured to cause the UE to: in response to a drop of at least one SRS port of the fourth number of SRS ports in communication with a network entity, continue the communication with the network entity with the SRS ports that have not been dropped. ### Claim 15 (depends on 1) The apparatus of claim 1, wherein an SRS usage of the first number of SRS ports is for codebook-based physical uplink shared channel (PUSCH), and codebooks for the first number of SRS ports are for an antenna switching scheme, and wherein the at least one processor is further configured to cause the UE to: in response to a drop of at least one SRS port of the first number of SRS ports in communication with a network entity, continue the communication with the network entity with the SRS ports that have not been dropped. ### Claim 16 An apparatus for wireless communication at a network entity, comprising: at least one memory; and at least one processor coupled to the at least one memory and, based at least in part on information stored in the at least one memory, the at least one processor is configured to cause the network entity to: receive a sounding reference signal (SRS) from a first number of SRS ports of a user equipment (UE), wherein the first number of SRS ports of the UE are sequentially mapped over a second number of orthogonal frequency-division multiplexing (OFDM) symbols based on a repetition factor, wherein the second number is greater than one, wherein for each OFDM symbol of the second number of OFDM symbols, a respective subset of SRS ports of the first number of SRS ports is mapped to the OFDM symbol, wherein a number of SRS ports in the respective subset of SRS ports is less than the first number and is based on the repetition factor; transmit, to the UE, downlink control information (DCI) comprising an SRS resource indicator (SRI); and receive a physical uplink shared channel (PUSCH) transmission based on the SRS, wherein the PUSCH transmission is associated with the SRI. ### Claim 17 (depends on 16) The apparatus of claim 16, further comprising a transceiver coupled to the at least one processor, wherein, to receive the SRS, the at least one processor is configured to cause the network entity to receive the SRS via the transceiver, and wherein the SRS is for a codebook-based PUSCH, and a first subset of the SRS ports are coherent and a second subset of the SRS ports are coherent, the first subset of the SRS ports being incoherent with the second subset of the SRS ports. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the first subset of the SRS ports are mapped to a first contiguous subset of the OFDM symbols, and the second subset of the SRS ports are mapped to a second contiguous subset of the OFDM symbols. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein the first contiguous subset of the OFDM symbols is contiguous or non-contiguous with the second subset of the OFDM symbols. ### Claim 20 (depends on 16) The apparatus of claim 16, wherein the first number of SRS ports are mapped to the second number of OFDM symbols within a same slot or sub-slot based on the first number of SRS ports being a coherent SRS port group. ### Claim 21 (depends on 16) The apparatus of claim 16, wherein non-coherent SRS ports are mapped to the second number of OFDM symbols in different slots or different sub-slots. ### Claim 22 (depends on 16) The apparatus of claim 16, wherein a usage of the first number of SRS ports is for codebook-based physical uplink shared channel (PUSCH), and codebooks for the first number of SRS ports are for an antenna switching scheme, wherein the first number of SRS ports are sequentially mapped to the second number of OFDM symbols in contiguous or non-contiguous symbols based on the antenna switching scheme. ### Claim 23 (depends on 16) The apparatus of claim 16, wherein a usage of the first number of SRS ports is for codebook-based physical uplink shared channel (PUSCH), and codebooks for the first number of SRS ports are for an antenna switching scheme, wherein the first number of SRS ports are sequentially mapped to the second number of OFDM symbols in a same slot, a same sub-slot, different slots, or different sub-slots based on the antenna switching scheme. ### Claim 24 (depends on 16) The apparatus of claim 16, wherein the first number of SRS ports are each mapped to a subset of the second number of OFDM symbols, the subset of the second number of OFDM symbols being based on the second number of OFDM symbols divided by the repetition factor, wherein a mapping from the first number of SRS ports to the subset of the second number of OFDM symbols is repeated on the second number of OFDM symbols by a time specified by the repetition factor. ### Claim 25 (depends on 16) The apparatus of claim 16, wherein a subset of the first number of SRS ports are mapped to a single symbol, and the subset is based on the repetition factor. ### Claim 26 (depends on 16) The apparatus of claim 16, wherein the PUSCH transmission is associated with a most recent SRS resource indicated by the SRI that does not include a skipped transmission of at least one SRS port of the first number of SRS ports. ### Claim 27 (depends on 16) The apparatus of claim 16, wherein an association of the SRS with the PUSCH transmission is based on whether at least a part of an SRS transmission has been dropped and based on one or more of an SRS usage, a codebook, or a coherency. ### Claim 28 A method of wireless communication at a user equipment (UE), comprising: sequentially mapping, based on a repetition factor, a first number of Sounding Reference Signal (SRS) ports to a second number of orthogonal frequency-division multiplexing (OFDM) symbols, the first number and the second number each being greater than one, wherein for each OFDM symbol of the second number of OFDM symbols, a respective subset of SRS ports of the first number of SRS ports is mapped to the OFDM symbol, wherein a number of SRS ports in the respective subset of SRS ports is less than the first number and is based on the repetition factor; and transmitting an SRS from the first number of SRS ports over the second number of OFDM symbols based on the mapping. ### Claim 29 (depends on 28) The method of claim 28, wherein the SRS ports is based on a codebook, wherein a first subset of the SRS ports are coherent and a second subset of the SRS ports are coherent, the first subset of the SRS ports being incoherent with the second subset of the SRS ports. ### Claim 30 A method of wireless communication at a network entity, comprising: receiving a sounding reference signal (SRS) from a first number of SRS ports of a user equipment (UE), wherein the first number of SRS ports of the UE are sequentially mapped over a second number of orthogonal frequency-division multiplexing (OFDM) symbols based on a repetition factor, wherein the second number is greater than one, wherein for each OFDM symbol of the second number of OFDM symbols, a respective subset of SRS ports of the first number of SRS ports is mapped to the OFDM symbol, wherein a number of SRS ports in the respective subset of SRS ports is less than the first number and is based on the repetition factor; transmitting, to the UE, downlink control information (DCI) comprising an SRS resource indicator (SRI); and receiving a physical uplink shared channel (PUSCH) transmission based on the SRS, wherein the PUSCH transmission is associated with the SRI.