# US 12,119,973 B2 · Sounding reference signals for positioning > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,973 B2 - Document ID: US12119973B2 - Status: Granted - Kind: B2 - Application number: 18/461,444 - Filed: 2023-09-05 - Published: 2023-12-28 - Granted: 2024-10-15 - Earliest claimed: 2020-08-19 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Seyong Park; Alexandros Manolakos; Weimin Duan; Jay Kumar Sundararajan; Wanshi Chen; Krishna Kiran Mukkavilli; Tingfang Ji; Naga Bhushan - Web page: https://patentgrep.com/patent/US12119973B2 ## CPC - H04L 27/2607: {Cyclic extensions} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 27/26035: {Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences (using different training sequence per antenna H04B7/0684; code allocation H04J13/16)} - H04L 27/2613: {Structure of the reference signals} - H04L 27/2634: {Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation} - H04W 64/00: Locating users or terminals {or network equipment} for network management purposes, e.g. mobility management - 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 Sounding reference signals (SRS) transmitted by a UE, e.g., for positioning or channel estimation, may be configured for one or both of frequency tone level cyclic shift and symbol level code, which, for example, enables multiplexing a greater number of UEs. The frequency tone level cyclic shift is produced by jointly processing a number of symbols with an extended cyclic shift structure. The SRS may be configured using a symbol group level that indicates the number of symbols associated with a cyclic shift structure, and an outer code that indicates a multiplier applied to the SRS at the symbol level, which increases the multiplexing opportunities. The symbol level code may further indicate an extended cyclic shift indicating a linear increase in phase rotation across tones in symbols associated with the symbol group level. ## 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 instructions stored in the at least one memory, the at least one processor is configured to: receive a configuration for sounding reference signals (SRS) from a base station, the configuration for the SRS comprising (1) a symbol group level indicating a number of symbols associated with a cyclic shift structure or (2) an outer code indicating a multiplier applied to the SRS at a symbol level; and transmit, to one or more base stations, the SRS according to the configuration for the SRS comprising the symbol group level or the outer code. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the outer code is associated with an increased multiplexing capacity due to the outer code being an identifier for the UE relative to other UEs that transmit the SRS using a same symbol group level with a different outer code. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the outer code comprises a set or a subset of an orthogonal basis comprising one of a Fourier basis or a Hadamard basis. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the configuration for the SRS further comprises an extended cyclic shift that indicates a linear increase in a phase rotation across tones in the number of symbols, and wherein to transmit the SRS, the at least one processor is further configured to transmit the SRS based on the extended cyclic shift. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the configuration for the SRS further comprises a bandwidth and a comb size. ### Claim 6 (depends on 5) The apparatus of claim 5, wherein a maximum number of extended cyclic shifts is based on the number of symbols associated with the cyclic shift structure, the comb size, and the symbol group level. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein to transmit the SRS, the at least one processor is configured to transmit the SRS to the one or more base stations for channel estimation or positioning. ### Claim 8 (depends on 1) The apparatus of claim 1, further comprising a wireless transceiver coupled to the at least one processor, and wherein to transmit the SRS, the at least one processor is configured to transmit the SRS via the wireless transceiver. ### Claim 9 An apparatus for wireless communication at a network node, comprising: at least one memory; and at least one processor coupled to the at least one memory, and based at least in part on instructions stored in the at least one memory, the at least one processor is configured to: transmit, to a user equipment (UE), a configuration for sounding reference signals (SRS), the configuration for the SRS comprising (1) a symbol group level indicating a number of symbols associated with a cyclic shift structure or (2) an outer code indicating a multiplier applied to the SRS at a symbol level; receive, from the UE, the SRS; and process the SRS according to the configuration for the SRS comprising the symbol group level or the outer code. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the outer code is associated with an increased multiplexing capacity due to the outer code being an identifier for the UE relative to other UEs that transmit the SRS using a same symbol group level with a different outer code. ### Claim 11 (depends on 9) The apparatus of claim 9, wherein the outer code comprises a set or a subset of an orthogonal basis comprising one of a Fourier basis or a Hadamard basis. ### Claim 12 (depends on 9) The apparatus of claim 9, wherein the configuration for the SRS further comprises an extended cyclic shift that indicates a linear increase in a phase rotation across tones in the number of symbols, and wherein to process the SRS, the at least one processor is further configured to process the SRS based on the extended cyclic shift. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the configuration for the SRS further comprises a bandwidth and a comb size. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein a maximum number of extended cyclic shifts is based on the number of symbols associated with the cyclic shift structure, the comb size, and the symbol group level. ### Claim 15 (depends on 9) The apparatus of claim 9, wherein to receive the SRS, the at least one processor is configured to receive the SRS for channel estimation. ### Claim 16 (depends on 9) The apparatus of claim 9, wherein the at least one processor is further configured to: generate, based on the SRS, positioning measurements; and send the positioning measurements to a network entity for a position estimation of the UE. ### Claim 17 (depends on 9) The apparatus of claim 9, further comprising a wireless transceiver coupled to the at least one processor, and wherein to receive the SRS, the at least one processor is configured to receive the SRS via the wireless transceiver. ### Claim 18 A method of wireless communication at a user equipment (UE), comprising: receiving a configuration for sounding reference signals (SRS) from a base station, the configuration for the SRS comprising (1) a symbol group level indicating a number of symbols associated with a cyclic shift structure or (2) an outer code indicating a multiplier applied to the SRS at a symbol level; and transmitting, to one or more base stations, the SRS according to the configuration for the SRS comprising the symbol group level or the outer code. ### Claim 19 (depends on 18) The method of claim 18, wherein the outer code is associated with an increased multiplexing capacity due to the outer code being an identifier for the UE relative to other UEs that transmit the SRS using a same symbol group level with a different outer code. ### Claim 20 (depends on 18) The method of claim 18, wherein the outer code comprises a set or a subset of an orthogonal basis comprising one of a Fourier basis or a Hadamard basis. ### Claim 21 (depends on 18) The method of claim 18, wherein the configuration for the SRS further comprises an extended cyclic shift that indicates a linear increase in a phase rotation across tones in the number of symbols, and wherein transmitting the SRS comprises transmitting the SRS based on the extended cyclic shift. ### Claim 22 (depends on 18) The method of claim 18, wherein the configuration for the SRS further comprises a bandwidth and a comb size. ### Claim 23 (depends on 22) The method of claim 22, wherein a maximum number of extended cyclic shifts is based on the number of symbols associated with the cyclic shift structure, the comb size, and the symbol group level. ### Claim 24 (depends on 18) The method of claim 18, wherein transmitting the SRS comprises transmitting the SRS to the one or more base stations for channel estimation or positioning. ### Claim 25 A method of wireless communication at a network node, comprising: transmitting, to a user equipment (UE), a configuration for sounding reference signals (SRS), the configuration for the SRS comprising (1) a symbol group level indicating a number of symbols associated with a cyclic shift structure or (2) an outer code indicating a multiplier applied to the SRS at a symbol level; receiving, from the UE, the SRS; and processing the SRS according to the configuration for the SRS comprising the symbol group level or the outer code. ### Claim 26 (depends on 25) The method of claim 25, wherein the outer code is associated with an increased multiplexing capacity due to the outer code being an identifier for the UE relative to other UEs that transmit the SRS using a same symbol group level with a different outer code. ### Claim 27 (depends on 25) The method of claim 25, wherein the outer code comprises a set or a subset of an orthogonal basis comprising one of a Fourier basis or a Hadamard basis. ### Claim 28 (depends on 25) The method of claim 25, wherein the configuration for the SRS further comprises an extended cyclic shift that indicates a linear increase in a phase rotation across tones in the number of symbols, and wherein processing the SRS comprises processing the SRS based on the extended cyclic shift. ### Claim 29 (depends on 28) The method of claim 28, wherein the configuration for the SRS further comprises a bandwidth and a comb size. ### Claim 30 (depends on 29) The method of claim 29, wherein a maximum number of extended cyclic shifts is based on the number of symbols associated with the cyclic shift structure, the comb size, and the symbol group level.