Sounding reference signal transmission for large number of uplink transmitters

Abstract

Methods, systems, and devices are described for sounding reference signal (SRS) transmission for a large number of uplink (UL) transmitters. An example method for wireless communication includes determining, by a wireless device, one or more sounding reference signal (SRS) resources, and performing SRS transmissions to a network node using one or more SRS ports in the one or more SRS resources. Another example method for wireless communication includes receiving, by a network node, a sounding reference signal (SRS) transmission from a wireless device over one or more SRS resources, where the wireless device is configured to determine the one or more SRS resources, and perform the SRS transmission using one or more SRS ports in the one or more SRS resources.

Description

[0001] This application is a divisional application. The application number of the original application is 202280038473.3, and the application date is April 21, 2022. The entire content of the original application is incorporated herein by reference. Technical Field

[0002] This patent document generally relates to digital wireless communication. Background Art

[0003] Mobile telecommunication technologies are pushing the world towards an increasingly interconnected and networked society. Compared with existing wireless networks, next-generation systems and wireless communication technologies will need to support a wider range of use case characteristics and provide more complex and refined access requirements and flexibility.

[0004] Long-Term Evolution (LTE) is a wireless communication standard for mobile devices and data terminals developed by the Third Generation Partnership Project (3GPP). LTE-Advanced (LTE-A) is a wireless communication standard that enhances the LTE standard. The fifth-generation wireless system, known as 5G, advances the LTE and LTE-A wireless standards and aims to support higher data rates, massive connectivity, ultra-low latency, high reliability, and other emerging service requirements. Summary of the Invention

[0005] Techniques for sounding reference signal (SRS) transmission for a large number of uplink (UL) transmitters are disclosed, which advantageously support increased uplink throughput associated with emerging technologies and implementations, such as customer premise equipment (CPE), fixed wireless access (FWA), vehicle equipment, and industrial equipment. In an example, the described embodiments support more SRS ports for a single physical uplink shared channel (PUSCH) transmission by increasing the number of SRS ports in a single SRS resource or providing a combination of SRS resources for more ports. In another example, for non-codebook-based PUSCH transmission, an association between SRS resources and one or more channel state information (CSI) reference signals (RS) is described to facilitate UL precoding at the user equipment (UE) side. In yet another example, for SRS antenna switching, a large number of SRS ports are allocated across several SRS resources or sets for a large number of UL transmission scenarios. In yet another example, a solution for channel and interference measurement using the assistance of DL RS to support SRS port hopping and beamforming SRS for coherent joint transmission (C-JT) is described.

[0006] In an example aspect, a method for wireless communication is described. The method includes: determining, by a wireless device, one or more sounding reference signal (SRS) resources and performing SRS transmission to a network node using one or more SRS ports in the one or more SRS resources.

[0007] In another example aspect, a method for wireless communication is described. The method includes: receiving, by a network node, a sounding reference signal (SRS) transmission from a wireless device via one or more SRS resources, where the wireless device is configured to determine one or more SRS resources and perform the SRS transmission using one or more SRS ports among the one or more SRS resources.

[0008] In yet another example aspect, the above method is embodied in the form of processor-executable code and is stored in a non-transitory computer-readable storage medium. When executed by a processor, the code included in the computer-readable storage medium causes the processor to implement the method described in this patent document.

[0009] In yet another example embodiment, a device configured to or operable to perform the above method is disclosed.

[0010] The above and other aspects and their implementations are described in more detail in the drawings, the description, and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figures 1A - 1D An example of an 8-Tx UE antenna architecture is shown.

[0012] Figure 2 An example framework for SRS transmission for a large number of UL transmitters according to the currently disclosed technology is shown.

[0013] Figure 3 An example of a media access control (MAC) control element (CE) for combining one or more SRS resources for an SRS resource indicator (SRI) code point is shown.

[0014] Figure 4 An example diagram for transmitting more than one SRS resource is shown.

[0015] Figure 5 An example scenario supporting 8-Tx SRS ports is shown.

[0016] Figure 6 A flowchart of an example method for wireless communication is shown.

[0017] Figure 7 A flowchart of another example method for wireless communication is shown.

[0018] Figure 8 An example block diagram of a hardware platform that can be part of a network device or a communication device is shown.

[0019] Figure 9An example of wireless communication including a base station (BS) and a user equipment (UE) based on some implementations of the disclosed technology is shown. Detailed Description

[0020] In the fifth generation (5G) new radio (NR), time-division duplex (TDD)-based networking is becoming a preferred implementation because wide or ultra-wide spectrum requirements render frequency-division duplex (FDD)-based networking infeasible. In these systems, channel reciprocity is exploited, and thus, SRS design is essential for wireless channel estimation for both downlink (DL) and uplink (UL) transmissions. With the increase in user equipment (UE) UL transmitters, current and evolving wireless communication systems need to enhance SRS transmission to facilitate UL massive multiple-input multiple-output (MIMO) requirements (e.g., supporting 8 or more UL transmitters).

[0021] To support UL massive MIMO / transmitters, the current implementations of SRS port and resource configuration and / or mapping need to be improved, and flexible SRS beamforming schemes (e.g., for coherent joint transmission (C-JT)) need to be developed.

[0022] Embodiments of the disclosed technology particularly provide the following technical solutions:

[0023] (1) To accommodate PUSCH codebook and non-codebook transmissions in a large number of UL transmitters, embodiments for supporting more SRS ports in a single SRS resource or combining more than one resource are described for a single PUSCH transmission. For example, when supporting more SRS ports in a single resource, the mapping between SRS ports and sequences / resources (e.g., resource elements (REs)) is considered, and when combining more than one resource, configuration enhancements and corresponding rules are described.

[0024] (2) To assist DL precoding by exploiting channel reciprocity, embodiments for SRS antenna switching in a large number of UL transmitters are described. Compared with traditional SRS transmission schemes, distributing a large number of SRS ports across several SRS resources or SRS resource sets is considered.

[0025] (3) As the number of UL transmitters increases, the UE can efficiently perform a high-resolution beamforming process compared with traditional UE implementations. To mitigate UL interference and implicitly represent DL interference, embodiments of SRS port hopping and beamforming SRS (with the aid of DL reference signals, e.g., channel state information (CSI) reference signals (RSs) for interference measurement and CSI interference measurement (CSI-IM), non-zero power (NZP) CSI-RS) are described.

[0026] The following example headings for each section are for ease of understanding the disclosed subject matter and do not limit the scope of the claimed subject matter in any way. Thus, one or more features of one example section may be combined with one or more features of another example section. Additionally, for clarity of explanation, 5G terminology is used, but the techniques disclosed in this document are not limited to 5G technology and may be used in wireless systems implementing other protocols.

[0027] 1 Overview of Sounding Reference Signal (SRS)

[0028] As the number of UL transmitters increases (e.g., using Figures 1A - 1D the example user equipment (UE) antenna architecture shown, Figure 1A and Figure 1B illustrating fully coherent cases with different N1 / N2 configurations, and Figure 1C and Figure 1D illustrating partially coherent cases), embodiments of SRS enhancements for adapting UL data transmission (e.g., codebook-based and non-codebook-based transmissions, antenna switching, and interference randomization (e.g., for C-JT)) corresponding requirements are described in this document. For example, in LTE, there is a single legacy UL transmitter in the UE, but in 5G-NR, there can be two transmitters in the UE. Additionally, in 5G Advanced or 6G systems, an increasing number of UE UL transmitters can be deployed, especially for customer premise equipment (CPE), fixed wireless access (FWA), vehicle equipment, and industrial equipment.

[0029] In some embodiments, and for legacy SRS configurations, the SRS resources are configured by radio resource control (RRC) and include:

[0030] - a number of antenna ports where represents the number of antenna ports,

[0031] - represents the number of consecutive OFDM symbols,

[0032] -l0, the starting position in the time domain given by where the offset l offset ∈{0,1,...,13} counts the symbols backward from the end of the time slot, and

[0033] -k0, the starting frequency domain position of the sounding reference signal.

[0034] In this embodiment, the SRS sequence of the SRS resource can be generated according to the following formula:

[0035]

[0036] In this document, denotes the length of the sounding reference signal sequence, and the sequence is given by where m SRS,b denotes the bandwidth of the SRS, b = B SRS , where B SRS ∈ {0, 1, 2, 3} is given by the field b-SRS configured through RRC.

[0037] For example, is a type of sequence (e.g., defined in Clause 5.2.2 of TS 38.211, or ZC sequence), where:

[0038] - δ = log2(K TC ), and the number of transmission combs K TC ∈ {2, 4, 8} is included in the higher layer parameter transmissionComb.

[0039] - The cyclic shift a i of antenna port p i is given by

[0040]

[0041] where denotes the value corresponding to the cyclic shift, and the maximum number of cyclic shifts is given by .

[0042] - The sequence group and the sequence number v are also configured by RRC.

[0043] In this document, and respectively denote the SRS sequence identity and the number of time slots in a frame with a subcarrier spacing configuration μ, and is the number of OFDM symbols within the SRS resource. In addition,

[0044] - If groupOrSequenceHopping is equal to "neither", then neither group hopping nor sequence hopping should be used, and

[0045]

[0046] v = 0

[0047] - If groupOrSequenceHopping is equal to "groupHopping", then group hopping can be used, and sequence hopping should not be used, and

[0048]

[0049] v = 0

[0050] where c(i) represents a pseudo - random sequence and shall be initialized with at the start of each radio frame.

[0051] - If groupOrSequenceHopping is equal to "sequenceHopping", sequence hopping shall be used instead of group hopping, and

[0052]

[0053] where c(i) represents a pseudo - random sequence and shall be initialized with at the start of each radio frame.

[0054] - If groupOrSequenceHopping is equal to "sequenceHopping", sequence hopping shall be used instead of group hopping, and

[0055]

[0056] where c(i) represents a pseudo - random sequence and shall be initialized with at the start of each radio frame.

[0057] In some embodiments, and when the SRS is transmitted on a given SRS resource, the sequence for each OFDM symbol l′ and for each antenna port of the SRS resource shall be multiplied by an amplitude scaling factor β SRS to conform to the transmission power, and for each antenna port p according to the following formula i starting from is mapped in sequence to the resource elements (k, l) in the time slot

[0058]

[0059] In some embodiments, and ignoring the SRS for positioning, the starting position in the frequency domain is defined by the following formula

[0060]

[0061] where

[0062]

[0063] Herein, if configured, k F ∈ {0, 1,..., P F-1} is defined by the higher layer parameter StartRBIndex, otherwise k F = 0, and k hop is defined using Table 1, where

[0064]

[0065] Table 1: k hop As a function of

[0066]

[0067] In some embodiments, the frequency domain offset value n shift adjusts the SRS allocation relative to a reference point grid and is included in the higher layer parameter freqDomainShift. The transmission comb offset is included in the higher layer parameter, and n b is a frequency position index.

[0068] In some embodiments, the frequency hopping of the sounding reference signal is configured by the parameter b hop ∈ {0, 1, 2, 3}, which is given by the field b-hop included in the higher layer parameter freqHopping (if configured), otherwise b hop = 0.

[0069] For all OFDM symbols of the SRS resource, if b hop ≥ B SRS , then the frequency hopping is disabled, and the frequency position index n b remains constant (unless reconfigured) and is defined by

[0070]

[0071] Herein, n RRC is given by the higher layer parameter freqDomainPosition.

[0072] If b hop < B SRS , then the frequency hopping is enabled, and the frequency position index n b is defined by

[0073]

[0074] where N b is given by Table 6.4.1.4.3-1,

[0075]

[0076] And and independent of the value of N b value.

[0077] In this document, n SRS counts the number of SRS transmissions.

[0078] When the SRS resource is configured by the higher layer parameter resourceType as non-periodic, it is given by the number of symbols in the time slot in which the SRS resource is transmitted given. The quantity is the repetition factor given by the field repeationFactor (if configured), otherwise

[0079] When the SRS resource is configured by the higher layer parameter resourceType as periodic or semi-persistent, for the time slots satisfying the SRS counter is given by

[0080]

[0081] where T SRS and T offset represent the period and the time slot offset in the time slot, respectively.

[0082] 2 Definitions and terms related to the disclosed technology

[0083] As used herein, "beam state" is equivalent to a quasi co-location (QCL) state, a transmission configuration indicator (TCI) state, a spatial relation (or spatial relation information), a reference signal (RS), a spatial filter, or precoding. In some embodiments, "beam state" is also referred to as "beam". In some embodiments, "Tx beam" is equivalent to a QCL state, a TCI state, a spatial relation state, a DL reference signal, a UL reference signal, a Tx spatial filter, or a Tx precoding. In some embodiments, "Rx beam" is equivalent to a QCL state, a TCI state, a spatial relation state, a spatial filter, an Rx spatial filter, or an Rx precoding.

[0084] As used herein, "beam ID" is equivalent to a QCL state index, a TCI state index, a spatial relation state index, a reference signal index, a spatial filter index, or a precoding index. In some embodiments, a spatial filter (or a spatial domain filter) can be a UE-side spatial filter or a gNB-side spatial filter.

[0085] As described herein, "spatial relation information" includes one or more reference RSs, which are used to represent the same or quasi-co-located "spatial relation" between a target "RS or channel" and one or more reference RSs. In some embodiments, "spatial relation" refers to a beam, a spatial parameter, or a spatial domain filter.

[0086] As described herein, "QCL state" includes one or more reference RSs and their corresponding QCL type parameters, where the QCL type parameters include at least one or a combination of the following aspects: [1] Doppler spread, [2] Doppler shift, [3] delay spread, [4] average delay, [5] average gain, and [6] spatial parameter (or spatial Rx parameter).

[0087] As described herein, "TCI state" is equivalent to "QCL state". In some embodiments, different types of QCL states are defined as:

[0088] - "QCL-TypeA": {Doppler shift, Doppler spread, average delay, delay spread}

[0089] - "QCL-TypeB": {Doppler shift, Doppler spread}

[0090] - "QCL-TypeC": {Doppler shift, average delay}

[0091] - "QCL-TypeD": {spatial Rx parameter}

[0092] As described herein, reference signal (RS) includes channel state information reference signal (CSI-RS), synchronization signal block (SSB) (or SS / PBCH), demodulation reference signal (DMRS), sounding reference signal (SRS), and physical random access channel (PRACH). In some embodiments, RS includes at least DL reference signaling and UL reference signaling. In some embodiments, DL reference signaling includes CSI-RS, SSB, or DMRS (e.g., DL DMRS). In some embodiments, UL reference signaling includes SRS, DMRS (e.g., UL DMRS), and PRACH.

[0093] As described herein, "uplink (UL) signal" includes physical uplink control channel (PUCCH), PUSCH, or SRS.

[0094] As described herein, "downlink (DL) signal" includes physical downlink control channel (PDCCH), physical downlink shared channel (PDSCH), or CSI-RS. In some embodiments, PDCCH is equivalent to downlink control information (DCI).

[0095] As described herein, a "time unit" may be a sub-symbol, symbol, time slot, sub-frame, frame, or transmission occasion.

[0096] As described herein, the power control parameter includes at least one of a path loss RS, an open-loop parameter, or a closed-loop index. In some embodiments, the power control parameter is equivalent to the "UL power control parameter". In some embodiments, the closed-loop index is equivalent to the "power control adjustment state". In some embodiments, the open-loop parameter includes at least one of a target power (P0) and / or a factor (α).

[0097] As described herein, a "port" is equivalent to an antenna port, a UE antenna port, or an SRS port. In some embodiments, the SRS port is equivalent to an antenna interface or a UE antenna port. In some embodiments, the antenna port is defined such that the channel of a symbol transmitted on an antenna port can be inferred from the channel of another symbol transmitted on the same antenna port.

[0098] As described herein, "antenna switching" or "SRS antenna switching" is equivalent to downlink (DL) channel state information (CSI) acquisition.

[0099] 3 Examples of SRS transmission schemes supporting a large number of UL transmitters

[0100] As Figure 2 shown, embodiments of the disclosed technology specifically provide the following technical solutions for a large number of UL transmitters:

[0101] (1) For UL data transmission, provide sufficient SRS ports to accommodate UL transmissions for both PUSCH codebook and non-codebook transmissions;

[0102] (2) For antenna switching, allocate a large number of SRS ports across several SRS resources or SRS resource sets and specify corresponding rules; and

[0103] (3) To mitigate cross-SRS interference between transmission / reception points (TRPs) / cells, provide interference randomization with SRS port hopping and beamforming SRS transmissions.

[0104] In some embodiments, the UE determines the SRS sequence and SRS-related resource elements (e.g., physical resources in the frequency domain and time domain) based on one or more SRS configuration parameters, and then transmits the corresponding SRS.

[0105] In some embodiments, and for codebook transmission of PUSCH, (i) the number of SRS ports in a single resource is increased to more than 4 (e.g., up to 8 SRS ports are supported for 8-TX UL operation), and each of the additional SRS ports is defined by a cyclic shift (CS), and (ii) more than one SRS resource is used to support the additional SRS ports. In the latter case, additional enhancements to the increased SRS ports in a single SRS resource may not be required. These embodiments are described in further detail in Section 4.

[0106] In some embodiments, and for non-codebook transmission of PUSCH, CSI-RS can be associated with SRS. For example, one or more CSI-RS can be associated with an SRS resource set. As another example, two or more CSI-RS can be applied to each SRS resource or all SRS resources in a single set or different sets. These embodiments are described in further detail in Section 5.

[0107] In some embodiments, and for SRS antenna switching, different SRS antenna ports are allocated across different SRS resources, which can be in a single SRS resource set or from different SRS resource sets. These embodiments are described in further detail in Section 6.

[0108] In some embodiments, and for SRS port hopping, SRS port-related parameters (e.g., different CS values or comb offsets) are determined based on an SRS-related time unit (e.g., n_SRS or SRS_ID). In some embodiments, SRS is enhanced to directly reflect DL interference spatial information (using UL-DL reciprocity), and in terms of UL precoding or beam state, SRS transmission is determined based on non-zero power (NZP) CSI-RS for interference measurement or CSI-IM. These embodiments are described in further detail in Section 7.

[0109] 4 Examples of SRS for Codebook-Based PUSCH Transmission

[0110] For codebook-based PUSCH transmission, there is typically a one-to-one mapping between PUSCH ports and SRS ports, and the transmitter precoding matrix indicator (TPMI) provides UL precoding information based on the measured SRS ports. For example, codebook-based PUSCH transmission can correspond to a single SRS resource, which means that the number of SRS ports in a single SRS resource is increased to support a large number of UL transmitters.

[0111] In some embodiments, SRS ports are based on CS values and / or comb offsets. In some examples, different ports in an 8-port SRS resource correspond to different CS values and / or comb offsets. In other examples, consider the following cases:

[0112] Case 1 . Based on the CS value only, the SRS port can be distinguished from other SRS ports in the resource, and in this case, the number of transmission combs K TC ∈ {2, 4}. This means that K TC = 8 is excluded; this is because the maximum number of CS values is 6 and different SRS ports cannot be distinguished.

[0113] Case 2 . Based on both the CS value and the comb offset, the SRS port can be distinguished from other SRS ports in the resource, and in this case, the number of transmission combs K TC ∈ {2, 4, 8}. For 8-Tx UL operation, each of the 8 ports in the SRS resource can be distinguished based on both 4 different CS values and 2 different comb offsets.

[0114] - For example, the CSα i of the SRS port p i is determined as:

[0115]

[0116] - In one case, and

[0117] - In another case, and K TC = 8.

[0118] - For example, the CSα i of the SRS port p i is determined as or (floor(p i / 2)), where is the number of antenna ports.

[0119] - For example, if the condition is satisfied, the comb offset i of the SRS port p is determined as:

[0120]

[0121] - In one case, the condition is p i ∈ {1001, 1003, 1005, 1007}, and

[0122] - In another case, the condition is p i∈ {1001, 1003, 1005, 1007}, and K TC = 8.

[0123] - For example, the comb offset of SRS port p i is determined to be or or

[0124] - For example, the comb offset of the SRS port group in the SRS resource is configured by RRC or MAC-CE.

[0125] - For example, one or more combinations of the (multiple) CS values and the (multiple) comb offsets of the SRS port group in the SRS resource are configured by RRC or MAC-CE.

[0126] Case 3 . Based on both the CS value and the time offset, the SRS port can be distinguished from other SRS ports in the resource, and in this case, the number of transmission combs K TC ∈ {2, 4, 8}. For 8-Tx UL operation, each of the 8 ports in the SRS resource can be distinguished based on both 4 different CS values and 2 different time offsets.

[0127] - For example, the time position l′ of SRS port p i is determined as:

[0128] If p i ∈ {1001, 1003, 1005, 1007}

[0129] Otherwise

[0130] - In one case,

[0131] - For example, the time offset is determined based on the number of transmission combs K TC to be determined.

[0132] Case 4 . Based on both the CS value and the orthogonal cover code (OCC) parameter, the SRS port can be distinguished from other SRS ports in the resource, and in this case, the number of transmission combs K TC ∈ {2, 4, 8}.

[0133] - For example, for 8-Tx UL operation, each of the 8 ports in the SRS resource can be distinguished based on both 4 different CS values and 2 different OCC parameters.

[0134] - For example, for 8-Tx UL operation, each of the 8 ports in the SRS resource can be differentiated based on both 2 different CS values and 4 different OCC parameters.

[0135] - For example, the SRS port can be determined based on both the OCC parameter and the CS value, or both the OCC parameter and the comb offset, or the OCC parameter, the CS value, and the comb offset.

[0136] - For example, the SRS port can be determined based on both the OCC parameter and the CS value.

[0137] In the case of supporting 8-SRS ports in 8-Tx UL operation, examples of cases 1-4 are as Figure 4 shown. These four cases correspond to only the CS value, the CS value and the comb offset, the CS value and the time offset, and the CS value and the time-domain OCC, respectively.

[0138] 5 Examples of SRS for non-codebook-based PUSCH transmission

[0139] For PUSCH non-codebook transmission, each SRS resource includes a single SRS port, and to support a large number of UL transmitters, sufficient SRS resources are introduced in any given SRS resource set. However, for these non-codebook transmissions, the UE is configured to calculate the precoder or beam state for SRS transmission based on measurements from the associated CSI-RS resources.

[0140] In some embodiments, the UE can be configured with one or more SRS resource sets, and each SRS resource set in the SRS resource set can be configured with one or more CSI-RS resources used to determine the precoder or beam state for SRS transmission.

[0141] - For example, one or more CSI-RS resources can be configured to have the same number of CSI-RS ports, the same power, or the same power offset (e.g., powerControlOffsetSS, or compared with the SSB).

[0142] - For example, one or more CSI-RS resources can be associated with the same trigger state or have the same trigger offset.

[0143] - For example, one or more CSI-RS resources can be associated with separate trigger offsets, or come from different CSI-RS resource sets.

[0144] - For example, the UE can calculate the precoding for SRS transmission in the SRS resource set based on one or more CSI-RS resources, and then the SRS resource set can be associated with more than one UL power control parameter (e.g., 2 path loss RSs).

[0145] - For example, one or more SRS resource sets may be associated with the same CSI-RS or a single CSI-RS, e.g., as in the case of a single TRP, but for supporting a large number of UL transmissions.

[0146] In some embodiments, the UE may be configured with one or more SRS resource sets, and each SRS resource set in the SRS resource sets may be configured with a single CSI-RS resource for determining a precoder or beam state for SRS transmission, and then the CSI-RS resource may be associated with more than one TCI state.

[0147] - For example, there may be one or more CSI-RS port groups in the CSI-RS resource, and then each in the CSI-RS port groups may be associated with one or more of more than one TCI state.

[0148] - For example, the CSI-RS may have more than one port group, and each port group may be configured with a TCI state (corresponding to a separate TRP / panel in Coherent Joint Transmission (C-JT)). Then, for SRS of non-codebook transmission, the UE may be configured to calculate a precoder based on the CSI-RS for SRS transmission for multiple TRPs in C-JT.

[0149] In some embodiments, for coherent JT, multiple SRS resource sets for codebook and non-codebook PUSCH may be associated with the same UL power control parameter, which ensures the same UL Tx power is used for each SRS.

[0150] - For example, the power control adjustment state (e.g., the closed-loop value) may be updated at the start of the first SRS resource per SRS resource set.

[0151] - For example, the power control adjustment state (e.g., the closed-loop value) may be updated at the start of the first SRS resource for all SRS resource sets.

[0152] 6 Examples of SRS for PUSCH Transmission

[0153] PUSCH transmission (e.g., codebook-based PUSCH or non-codebook-based PUSCH) may correspond to one or more SRS resources (e.g., the code points of the SRS resource indicator (SRI) in the DCI field refer to two SRS resources), and the PUSCH using the same SRS port in one or more SRS resources is transmitted.

[0154] In some embodiments, the mapping between PUSCH ports and SRS ports (e.g., the re-numbered index of the SRS port for alignment with the PUSCH port index) is determined based on the following: the index of the SRS port in the corresponding SRS resource, the parity of the index of the SRS port (e.g., even or odd), or the index of the corresponding SRS resource (e.g., the corresponding index in one or more SRS resources).

[0155] - For example, for the i-th SRS port in the (j + 1)-th SRS resource (e.g., when SRS ports are numbered starting from 0 and SRS resources are numbered starting from 1), the mapped PUSCH port is determined to be (i + j×N), where N is the number of SRS ports in the SRS resource. In the case where there are two SRS resources and each SRS resource has four ports, for example, the ports {a1, b1, c1, d1} for the first SRS resource and the ports {a2, b2, c2, d2} for the second SRS resource, then the indices of the ports {a1, b1, c1, d1, a2, b2, c2, d2} correspond to 1000 + {0, 1, 2, 3, 4, 5, 6, 7}.

[0156] - For example, for the i-th SRS port in the (j + 1)-th SRS resource (e.g., when SRS ports are numbered starting from 0 and SRS resources are numbered starting from 1), the mapped PUSCH port is determined to be (i + sum(j)), where "sum(j)" is the total number of SRS ports across the (j - 1)-th SRS resource with the lowest numbered index, and where sum(0) = 0.

[0157] - For example, the index of the SRS resource in one or more SRS resources is numbered by MAC-CE or RRC number (e.g., for code points), or numbered in ascending order by the SRS resource index or the corresponding SRS resource set index (e.g., 0 represents the lowest SRS resource index, 1 represents the second lowest SRS resource index, etc.)

[0158] In some embodiments, one or more SRS resources are in the same SRS resource set or the same SRS resource subset. In one example, within an SRS resource set, an SRS resource subset can be configured (e.g., also referred to as an SRS resource pair), and the SRS resource subset and the SRS resources (not belonging to the subset) can be grouped in a single set.

[0159] In some embodiments, one or more SRS resources are from different SRS resource sets. In these embodiments, each SRS resource in one or more SRS resources can be associated with a different closed loop of PUSCH.

[0160] In some embodiments, SRS ports from each of one or more SRS resources are associated with different UE antenna ports.

[0161] In some embodiments, one or more SRS resources may be associated with different closed loops of PUSCH (e.g., different power control adjustment states of PUSCH).

[0162] In some embodiments, one code point in the SRI field in DCI may be associated with a pair of SRS resources. In one example, this association may be configured and / or activated via MAC-CE or RRC. In another example, each pair of SRS resources should correspond to different SRS resource sets or subsets. In yet another example, if only one pair of SRS resources is activated or configured, the SRS resources in the pair are directly applied (e.g., no subsequent DCI indication is required).

[0163] In some embodiments, at least one of the following features is implemented:

[0164] - One or more SRS resources are in the same OFDM symbol, e.g., having the same transmission comb number K TC (e.g., comb-4), but having different comb offsets or different cyclic shift (CS) values;

[0165] - There is no time-domain gap between adjacent SRS resources;

[0166] - Within one period, there is no downlink symbol or downlink signal between two SRS resources; or

[0167] - The power control adjustment state (e.g., closed-loop value) is updated at the start of the first SRS resource in the SRS resource set.

[0168] In some embodiments, and as Figure 3 shown, one or more SRS resources may be associated with SRI code points in DCI. As shown therein, in RRC, there are multiple SRS resource sets / subsets configured by the gNB (e.g., Figure 3 step 1 in), and then at the MAC-CE or RRC level, one or more SRS resources may be associated with one SRS code point for DCI indication (e.g., Figure 3 step 3 in) (e.g., Figure 3 step 2 in). In one example, for 8-TX UL operation, there are two SRS resource sets / subsets, and in each of the SRS resource sets / subsets, there is only one 4-port SRS resource in one set.

[0169] In some embodiments, and as Figure 4As shown, two SRS resources (each with 4 ports) can be sent for 8-Tx PUSCH transmission. As shown in the figure, the 4 ports in the first SRS resource correspond to PUSCH ports 0 to 3 (or 1000 to 1003), and the 4 ports in the second SRS resource correspond to PUSCH 4 to 7 (or 1004 to 1007). As shown in this example, since the two SRS resources correspond to different transmitters (or Tx chains), there is no time-domain gap between the two SRSs, and thus no time-domain gap is required. In some embodiments, one or more PUSCH ports include one or more PUSCH port groups, and one of the one or more PUSCH port groups is mapped in sequence (e.g., ascending, descending, etc.) to an SRS port in a corresponding SRS resource among one or more SRS resources.

[0170] 7 Example of SRS for Antenna Switching

[0171] To support a large number of UL transmitters, more SRS ports and SRS resources can be configured for antenna switching (also known as downlink (DL) channel state information (CSI) acquisition), e.g., 8 transmitters and 8 receivers (8T8R). Different SRS antenna ports can be allocated across different SRS resources, which can be in a single SRS resource set or in different SRS resource sets.

[0172] - For example, a UE can be configured with one or more SRS resource sets, e.g., up to 2 SRS resource sets. Each SRS resource set in the SRS resource set includes one SRS resource, and each SRS resource has 8 SRS ports. In these implementations, a single SRS resource is sufficient to support the antenna switching process in 8T8R. Multiple SRS resource sets can refer to different time-domain behaviors, e.g., one SRS resource set for periodic transmission and another resource set for aperiodic transmission.

[0173] - For example, a UE can be configured with one or more SRS resource sets, each SRS resource set having two SRS resources, each SRS resource having 4 SRS ports, and the SRS ports of each SRS resource in a given set are associated with different UE antenna ports. In these implementations, two SRS resources in the SRS resource set are required to support the antenna switching process (also known as downlink (DL) channel state information (CSI) acquisition) in 8T8R. Additionally, in a given time unit, the two SRS resources in the set can be sent simultaneously.

[0174] - For example, a UE may be configured with up to two SRS resource sets, and each SRS resource in the two SRS resource sets has an SRS port associated with a different UE antenna port. For example, the UE may be configured with ports {0, 2, 4, 6} for the SRS resources in the first SRS resource set and ports {1, 3, 4, 7} for the SRS resources in the second SRS resource set.

[0175] - For example, for 8T8R, it is not allowed to configure more than one SRS resource set for antenna switching (e.g., used with a higher layer parameter set to "antennaSwitching") or trigger more than one SRS resource set in the same time unit (e.g., symbol or time slot).

[0176] Examples of 8 - port level hopping and beamforming SRS

[0177] The disclosed embodiments are configured to support a large number of UL transmitters, and compared with traditional UEs in C - JT, a large number of UL transmitters can be used to perform high - resolution beamforming. To mitigate UL interference and implicitly represent DL interference, the implementations described herein support SRS port hopping and beamforming SRS (with the help of DL RSs, e.g., CSI - RS, non - zero power (NZP) channel state information (CSI) reference signals (RSs) for interference measurement and CSI interference measurement (CSI - IM)).

[0178] In some embodiments, for SRS port - level hopping, the CS value and comb offset corresponding to the SRS port can be determined based on the time unit associated with the SRS.

[0179] - For example, the time unit includes at least one of the following: an SRS counter indicating an index associated with the transmission of the SRS, the number of time slots, the symbol index of the symbol associated with the SRS, or the number of symbols associated with the SRS.

[0180] - For example, one or more of the following can also be determined based on the time unit:

[0181] -{CS value, initialization value for the SRS (e.g., c init , u or v)}, {CS value, offset of the initialization value for the SRS}, or {CS value, partial frequency scaling factor}; or

[0182] -{comb offset, initialization value for the SRS}, {comb offset, bias of the initialization value for the SRS}, or {comb offset, partial frequency scaling factor}; or

[0183] -{CS value, comb offset, initialization value for SRS}, {CS value, comb offset, offset of the initialization value for SRS}, or {CS value, comb offset, partial frequency scaling factor}.

[0184] In some embodiments, for beamforming SRS, the precoder or beam state of the SRS transmission is based on a reference signal (RS) for interference measurement, CSI-IM, or an RS for channel measurement (e.g., SSB or CSI-RS).

[0185] - For example, it can be assumed that the measurement of the RS for interference measurement and CSI-IM is interference or an interference layer. Therefore, for the SRS precoder, the UL precoder should mitigate the impact of the interference simulated by the RS for interference measurement and CSI-IM.

[0186] - For example, the RS for interference measurement includes: a non-zero power (NZP) channel state information (CSI) reference signal (RS) for interference measurement.

[0187] - For example, the SRS can implicitly reflect DL interference spatial information while leveraging UL-DL reciprocity.

[0188] Example embodiments and implementations of the disclosed techniques

[0189] Figure 6 A flowchart of an example method 600 for wireless communication is shown. As shown therein, method 600 includes: at operation 610, determining, by a wireless device, one or more sounding reference signal (SRS) resources.

[0190] Method 600 includes: at operation 620, performing an SRS transmission to a network node using one or more SRS ports among the one or more SRS resources.

[0191] Figure 7 A flowchart of another example method 700 for wireless communication is shown. As shown therein, method 700 includes: at operation 710, receiving, by a network node, an SRS transmission from a wireless device via one or more sounding reference signal (SRS) resources, the wireless device being configured to determine one or more SRS resources and perform an SRS transmission using one or more SRS ports among the one or more SRS resources.

[0192] Embodiments of the disclosed techniques particularly provide the following technical solutions:

[0193] 1. A method for wireless communication, including: determining, by a wireless device, one or more sounding reference signal (SRS) resources; and performing an SRS transmission to a network node using one or more SRS ports among the one or more SRS resources.

[0194] 2. A method for wireless communication, comprising: receiving, by a network node, a sounding reference signal (SRS) transmission from a wireless device via one or more SRS resources, wherein the wireless device is configured to determine the one or more SRS resources and perform the SRS transmission using one or more SRS ports among the one or more SRS resources.

[0195] 3. The method according to solution 1 or 2 (e.g., as discussed in section 6), wherein a physical uplink shared channel (PUSCH) transmission corresponds to the one or more SRS resources, and wherein the PUSCH transmission is performed using one or more PUSCH ports.

[0196] 4. The method according to solution 3, wherein at least one of the following: the one or more PUSCH ports include one or more PUSCH port groups, and one PUSCH port group among the one or more PUSCH port groups is sequentially mapped to one SRS port among the one or more SRS ports in a corresponding resource among the one or more SRS resources; or, the mapping between the one or more PUSCH ports and the one or more SRS ports is based on the index of the SRS ports in the corresponding SRS resource, the index of the corresponding SRS resource, or the parity of the index of the SRS ports.

[0197] 5. The method according to solution 4, wherein the i-th SRS port in the (j + 1)-th SRS resource is mapped to the (i + j × N)-th PUSCH port, where N is an integer representing the number of SRS ports in the SRS resource.

[0198] 6. The method according to solution 4, wherein the i-th SRS port in the (j + 1)-th SRS resource is mapped to the (i + sum(j))-th PUSCH port, where sum(M) represents the total number of SRS ports in the lowest-indexed (M - 1) SRS resources, and where M is an integer.

[0199] 7. The method according to solution 4, wherein the index of the i-th SRS port in the (j + 1)-th SRS resource or the starting index of the i-th SRS port in the (j + 1)-th SRS resource is based on a media access control (MAC) control element (CE) or a radio resource control (RRC).

[0200] 8. The method according to solution 3, wherein the one or more SRS resources are in the same SRS resource set or the same SRS resource subset.

[0201] 9. The method according to Solution 3, wherein at least one of the following: at least two of the one or more SRS resources are from different SRS resource sets; the SRS ports of each of the one or more SRS resources are associated with different antenna ports of the wireless device; each of the one or more SRS resources is associated with a different power control adjustment state for the PUSCH; the one or more SRS resources are in the same orthogonal frequency division multiplexing (OFDM) symbol; or the one or more SRS resources correspond to the same transmission comb number.

[0202] 10. The method according to Solution 3, wherein at least a combination of the one or more SRS resources is associated with a code point in an SRS resource indicator (SRI) field in downlink control information (DCI).

[0203] 11. The method according to Solution 10, wherein the association between the combination of the one or more SRS resources and the code point is activated or configured by a media access control (MAC) control element (CE) or a radio resource control (RRC).

[0204] 12. The method according to Solution 10, wherein at least one of the following: each of the SRS resources in the combination of the one or more SRS resources corresponds to a different SRS resource set or SRS resource subset; or in response to only one combination being activated or configured by the MAC-CE or the RRC, at least one of the SRS resources in the combination of the one or more SRS resources is applied to the PUSCH transmission.

[0205] 13. The method according to Solution 3, wherein a first SRS resource among the one or more SRS resources has a first comb offset, and a second SRS resource among the one or more SRS resources has a second comb offset different from the first comb offset.

[0206] 14. The method according to Solution 3, wherein a first SRS resource among the one or more SRS resources has a first cyclic shift (CS) value, and a second SRS resource among the one or more SRS resources has a second CS value different from the first CS value.

[0207] 15. The method according to Solution 3, wherein at least one of the following: between two SRS resources among the one or more SRS resources, a time domain gap is excluded; between two SRS resources in one or more SRS resource sets, the time domain gap is excluded, the one or more SRS resource sets including at least one SRS resource among the one or more SRS resources; between two SRS resources among the one or more SRS resources, a downlink symbol or a downlink signal is excluded; between two SRS resources in one or more SRS resource sets, the downlink symbol or the downlink signal is excluded, the one or more SRS resource sets including at least one SRS resource among the one or more SRS resources; the one or more SRS resources are associated with the same uplink power control parameter; the power control adjustment state is updated at the start of a first SRS resource among the one or more SRS resources; or the power control adjustment state is updated at the start of a first SRS resource in one or more SRS resource sets, the one or more SRS resource sets including at least one SRS resource among the one or more SRS resources.

[0208] 16. The method according to Solution 1 or 2 (e.g., as discussed in Section 4), wherein the one or more SRS resources include a single SRS resource, and wherein codebook-based physical uplink shared channel (PUSCH) transmission corresponds to the single SRS resource.

[0209] 17. The method according to Solution 16, wherein the one or more SRS ports are determined based on a cyclic shift (CS) value or a comb offset.

[0210] 18. The method according to Solution 17, wherein at least one of the following: the one or more SRS ports in the single SRS resource are determined only based on the CS value, and wherein the number of transmission combs is 2 or 4; the one or more SRS ports in the single SRS resource are determined based on the CS value and the comb offset, and wherein the number of transmission combs is 2, 4, or 8; the one or more SRS ports in the single SRS resource are determined based on the CS value and a time offset, and wherein the number of transmission combs is 2, 4, or 8; the one or more SRS ports in the single SRS resource are determined based on the CS value and an orthogonal cover code (OCC) parameter, and wherein the number of transmission combs is 2, 4, or 8; or the one or more SRS ports in the single SRS resource are determined based on the CS value, the comb offset, and the OCC parameter, and wherein the number of transmission combs is 2, 4, or 8.

[0211] 19. The method according to solution 16, wherein the i-th CS value (α i ) of the i-th SRS port (p i ) for the single SRS resource is determined as: where where is the maximum number of cyclic shifts, where is the cyclic shift parameter corresponding to the single SRS resource, and where is the number of antenna ports.

[0212] 20. The method according to solution 19, wherein at least one of the following: and or and K TC = 8.

[0213] 21. The method according to solution 16, wherein the i-th CS value (α i ) of the i-th SRS port (p i ) for the single SRS resource is determined as or (floor(p i / 2)), where is the number of antenna ports.

[0214] 22. The method according to solution 16, wherein the i-th comb offset i of the i-th SRS port (p ) is determined in response to a condition as where otherwise where is the comb offset, and K TC is the number of transmission combs.

[0215] 23. The method according to solution 22, wherein the condition includes p i ∈ {10001, 1003, 1005, 1007}, or K TC = 8, at least one of which, where is the number of antenna ports of the wireless device, where is the maximum number of cyclic shifts, and where is the maximum number of cyclic shifts.

[0216] 24. The method according to solution 16, wherein the i-th comb offset i of the i-th SRS port (p ) is determined as or wherein is the comb shift, and K TC is the number of transmission combs.

[0217] 25. The method according to solution 16, wherein at least one of the following: the single SRS resource includes 8 SRS ports, and each of the 8 SRS ports can be identified according to both 4 individual CS values and 2 individual OCC parameters; the single SRS resource includes 8 SRS ports, and each of the 8 SRS ports can be identified according to both 2 individual CS values and 4 individual OCC parameters; or the time shift is determined according to the number of transmission combs K TC is determined.

[0218] 26. The method according to solution 1 or 2, wherein at least one of the following: the comb shift for the SRS port group in the SRS resource among the one or more SRS resources is configured by a media access control (MAC) control element (CE) or a radio resource control (RRC); or the combination of the cyclic shift value and the comb shift for the SRS port group in the SRS resource among the one or more SRS resources is configured by the MAC-CE or the RRC.

[0219] 27. The method according to solution 1 or 2 (e.g., as discussed in Section 5), wherein non-codebook physical uplink shared channel (PUSCH) transmission corresponds to the one or more SRS resources, and wherein the one or more SRS resources are part of one or more SRS resource sets.

[0220] 28. The method according to solution 27, wherein each SRS resource set among the one or more SRS resource sets is configured with one or more channel state information reference signal (CSI-RS) resources, and the one or more CSI-RS resources are used to determine the precoder or beam state for the SRS transmission.

[0221] 29. The method according to solution 28, wherein at least one of the following: each CSI-RS resource among the one or more CSI-RS resources includes an equal number of CSI-RS ports, equal power, or equal power offset; the one or more CSI-RS resources are associated with the same trigger state or the same trigger offset; or each CSI-RS resource among the one or more CSI-RS resources is associated with a corresponding trigger offset or from different CSI-RS resource sets.

[0222] 30. The method according to solution 27, wherein each of the one or more SRS resource sets is configured with a single channel state information reference signal (CSI-RS) resource, the single CSI-RS resource is used to determine a precoder or beam state for the SRS transmission, and wherein the single CSI-RS resource is associated with more than one transmission configuration indicator (TCI) state.

[0223] 31. The method according to solution 30, wherein the single CSI-RS resource comprises one or more CSI-RS port groups, and wherein each of the one or more CSI-RS port groups is associated with one or more of the more than one TCI states.

[0224] 32. The method according to solution 1 or 2 (e.g., as discussed in section 7), wherein the SRS transmission is used for downlink (DL) channel state information (CSI) acquisition, antenna switching, or a mode with 8 transmitters and 8 receivers (8T8R).

[0225] 33. The method according to solution 32, wherein each of the one or more SRS resources is in a different SRS resource set, and wherein the number of the one or more SRS ports in each SRS resource is equal to 8.

[0226] 34. The method according to solution 32, wherein the one or more SRS resources comprise two SRS resources, wherein the two SRS resources are in an SRS resource set, wherein the number of the one or more SRS ports in each of the two SRS resources is equal to 4, and wherein the SRS ports of the two SRS resources are associated with different antenna ports of the wireless device.

[0227] 35. The method according to solution 32, wherein the one or more SRS resources are in one or more SRS resource sets, wherein the one or more SRS resource sets comprise up to two SRS resource sets, and wherein each of the one or more SRS ports in the one or more SRS resources is associated with a different antenna port of the wireless device.

[0228] 36. The method according to solution 32, wherein only one of the one or more SRS resource sets can be configured or triggered for antenna switching in a single time unit.

[0229] 37. The method according to Solution 1 or 2 (e.g., as discussed in Section 8), wherein at least one of a cyclic shift (CS) value or a comb offset corresponding to one SRS port among the one or more SRS ports is determined based on a time unit associated with the SRS transmission.

[0230] 38. The method according to Solution 37, wherein the time unit associated with the SRS includes at least one of the following: a counter indicating an index associated with the SRS transmission, a number of time slots, a symbol index of a symbol associated with the SRS transmission, or a number of symbols associated with the SRS transmission.

[0231] 39. The method according to Solution 37, wherein at least one of an initialization value for the SRS transmission, an offset for the initialization value, or a partial frequency scaling factor is determined based on the time unit associated with the SRS transmission.

[0232] 40. The method according to Solution 1 or 2, wherein a precoder or a beam state for the SRS transmission is based on a reference signal for interference measurement or channel state information (CSI) interference measurement (IM).

[0233] 41. The method according to Solution 40, wherein a measurement of the reference signal for the interference measurement or the CSI-IM corresponds to an interference or an interference layer.

[0234] 42. An apparatus for wireless communication, comprising a processor configured to implement the method according to one or more of Solutions 1 to 41.

[0235] 43. A non-transitory computer-readable program storage medium having code stored thereon, which when executed by a processor, causes the processor to implement the method according to one or more of Solutions 1 to 41.

[0236] Figure 8 An example block diagram of a hardware platform 800 is shown. The hardware platform 800 can be part of a network device (e.g., a base station) or a communication device (e.g., a user equipment (UE)). The hardware platform 800 includes at least one processor 810 and a memory 805 having instructions stored thereon. When executed by the processor 810, the instructions configure the hardware platform 800 to perform the Figure 6 and Figure 7The operations described in. The transmitter 815 transmits or sends information or data to another device. For example, a network device transmitter can send a message to a user device. The receiver 820 receives information or data transmitted or sent by another device. For example, a user device can receive a message from a network device.

[0237] The implementation as described above will be applied to wireless communication. Figure 9 An example of a wireless communication system (e.g., a 5G or NR cellular network) is shown, which includes a base station 920 and one or more user equipment (UEs) 911, 912, and 913. In some embodiments, the UEs use communication links to the network (sometimes referred to as the uplink direction, as shown by the dashed arrows 931, 932, 933) to access the BS (e.g., the network), which subsequently enables subsequent communication from the BS to the UEs (e.g., shown in the direction from the network to the UEs, sometimes referred to as the downlink direction, as shown by the arrows 941, 942, 943). In some embodiments, the BS sends information to the UEs (sometimes referred to as the downlink direction, as shown by the arrows 941, 942, 943), which then enables subsequent communication from the UEs to the BS (e.g., shown in the direction from the UEs to the BS, sometimes referred to as the uplink direction, as shown by the dashed arrows 931, 932, 933). The UEs can be, for example, smart phones, tablets, mobile computers, machine-to-machine (M2M) devices, Internet of Things (IoT) devices, etc.

[0238] Some of the embodiments described herein are described in the general context of a method or process, which in one embodiment can be implemented by a computer program product embodied in a computer-readable medium that includes computer-executable instructions, such as program code, executed by a computer in a networked environment. The computer-readable medium can include removable and non-removable storage devices, including but not limited to read-only memory (ROM), random access memory (RAM), compact discs (CDs), digital versatile discs (DVDs), etc. Thus, the computer-readable medium can include non-transitory storage media. Generally, program modules can include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Computer or processor-executable instructions, associated data structures, and program modules represent examples of program code for performing the steps of the methods disclosed herein. A particular sequence of such executable instructions or associated data structures represents an example of corresponding actions for implementing the functions described in such steps or processes.

[0239] Some of the disclosed embodiments may be implemented as devices or modules using hardware circuits, software, or a combination thereof. For example, a hardware circuit implementation may include discrete analog and / or digital components, which are, for example, integrated as part of a printed circuit board. Alternatively or additionally, the disclosed components or modules may be implemented as application specific integrated circuits (ASICs) and / or field programmable gate array (FPGA) devices. Some implementations may additionally or alternatively include a digital signal processor (DSP), which is a specialized microprocessor with an architecture optimized for the operational requirements of digital signal processing associated with the functions disclosed in the present application. Similarly, the various components or sub-components within each module may be implemented in software, hardware, or firmware. Connections between modules and / or components within a module may be provided using any of the connection methods and media known in the art, including but not limited to communication over the Internet, wired or wireless networks using appropriate protocols.

[0240] Although this document includes many details, these details should not be construed as limiting the scope of the claimed invention or what may be claimed, but rather as descriptions of features of particular embodiments. Certain features described in this document in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, the various features described in the context of a single embodiment may also be implemented separately or in any suitable sub-combination in multiple embodiments. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, in some cases, one or more features from a claimed combination may be deleted from the combination, and the claimed combination may cover a sub-combination or a variant of a sub-combination. Similarly, although operations are depicted in the figures in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all of the illustrated operations be performed to obtain a desired result.

[0241] Only a few implementations and examples have been described, and other implementations, enhancements, and variations may be made based on what is described and illustrated in this disclosure.

Claims

1. A method for wireless communication, comprising: determining, by a wireless device, one or more sounding reference signal (SRS) resources; and performing, using one or more SRS ports among the one or more SRS resources, an SRS transmission to a network node, wherein the one or more SRS resources include a single SRS resource, and wherein a codebook-based physical uplink shared channel (PUSCH) transmission corresponds to the single SRS resource, wherein the one or more SRS ports in the single SRS resource are determined based on a cyclic shift (CS) value and a comb offset; wherein the i-th comb offset for the i-th SRS port (p i ) is determined to be: in response to the condition, otherwise where is the comb offset, and K TC = 2, 4, or 8 is the number of transmission combs,​ wherein the conditions include and p i ∈ {1001, 1003, 1005, 1007}, and wherein is the number of antenna ports of the wireless device.

2. The method according to claim 1, wherein the PUSCH transmission corresponds to the one or more SRS resources, and wherein the PUSCH transmission is performed using one or more PUSCH ports.

3. The method according to claim 2, wherein at least one of the following: each SRS resource among the one or more SRS resources is associated with a different power control adjustment state for the PUSCH; or the one or more SRS resources correspond to the same transmission comb number.

4. The method according to claim 1, wherein the time offset is determined according to the number of transmission combs K TC is determined.

5. The method according to claim 1, wherein at least one of the CS value or the comb offset corresponding to one SRS port among the one or more SRS ports is determined based on a time unit associated with the SRS transmission.

6. The method according to claim 5, wherein the time unit associated with the SRS includes a symbol index of a symbol associated with the SRS transmission.

7. A method for wireless communication, comprising: receiving, by a network node, an SRS transmission from a wireless device via one or more SRS resources, wherein the wireless device is configured to determine the one or more SRS resources and perform the SRS transmission using one or more SRS ports among the one or more SRS resources, wherein the one or more SRS resources include a single SRS resource, and wherein a codebook-based PUSCH transmission corresponds to the single SRS resource, wherein the one or more SRS ports in the single SRS resource are determined based on a CS value and a comb offset; where the i-th comb offset for the i-th SRS port (p i ) is determined to be: in response to a condition, otherwise where is the comb offset, and K = 2, 4, or 8 is the number of transmission combs, TC ​ wherein the conditions include and p i ∈ {1001, 1003, 1005, 1007}, and wherein is the number of antenna ports of the wireless device.

8. The method according to claim 7, wherein the PUSCH transmission corresponds to the one or more SRS resources, and wherein the PUSCH transmission is performed using one or more PUSCH ports.

9. The method according to claim 8, wherein at least one of the following: each SRS resource among the one or more SRS resources is associated with a different power control adjustment state for the PUSCH; or the one or more SRS resources correspond to the same transmission comb number.

10. The method according to claim 7, wherein the time offset is determined based on the number of transmission combs K TC is determined.

11. The method according to claim 7, wherein at least one of the CS value or the comb offset corresponding to one SRS port among the one or more SRS ports is determined based on a time unit associated with the SRS transmission.

12. The method according to claim 11, wherein the time unit associated with the SRS includes a symbol index of a symbol associated with the SRS transmission.

13. An apparatus for wireless communication comprising a processor, configured to implement the method according to any one of claims 1 to 12.

14. A computer-readable storage medium having stored thereon computer-executable instructions, which when executed by a device, implement the method according to any one of claims 1 to 12.

15. A computer program product comprising computer-executable instructions, which when executed by a device, implement the method according to any one of claims 1 to 12.

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