Methods and apparatus for srs configuration and transmission

Abstract

Methods and apparatuses for UE grouping are disclosed. A method at a base unit includes configuring one or more sets of higher layer parameters for SRS transmission with at least one of frequency hopping, repetition, and antenna switching; and transmitting DCI containing a non-zero SRS request field or transmitting higher layer signaling to trigger SRS transmission in a symbol in one or more normal subframes.

Description

Technical Field

[0001] The topics disclosed herein generally relate to wireless communication, and more specifically, to methods and apparatus for SRS configuration and transmission. Background Technology

[0002] The following abbreviations are defined herein, some of which are referenced in the following description: 3rd Generation Partnership Project (3GPP), European Telecommunications Standards Institute (ETSI), Frequency Division Duplex (FDD), Frequency Division Multiple Access (FDMA), Long Term Evolution (LTE), New Radio (NR), Very Large Scale Integration (VLSI), Random Access Memory (RAM), Read-Only Memory (ROM), Erasable Programmable Read-Only Memory (EPROM or Flash Memory), Optical Disc Read-Only Memory (CD-ROM), Local Area Network (LAN), Wide Area Network (WAN), Personal Digital Assistant (PDA), User Equipment (UE), Uplink (UL), Evolved Node B (eNB), Next Generation Node B (gNB), New Radio (NR), Downlink (DL), Central Processing Unit (CP) U), Graphics Processing Unit (GPU), Field Programmable Gate Array (FPGA), Dynamic RAM (DRAM), Synchronous Dynamic RAM (SDRAM), Static RAM (SRAM), Liquid Crystal Display (LCD), Light Emitting Diode (LED), Organic LED (OLED), Multiple Input Multiple Output (MIMO), Frequency Range 2 (FR2), Physical Uplink Shared Channel (PUSCH), Physical Downlink Control Channel (PDCCH), Sound Reference Signal (SRS), SRS Resource Indicator (SRI), Downlink Control Information (DCI), Resource Block (RB), Non-Zero Power (NZP) Channel State Information Reference Signal (CSI-RS), Time Division Duplex (TDD), Radio Resource Control (RRC), Media Access Control (MAC).

[0003] SRS is transmitted on the uplink channel to allow the base station to estimate the state of the uplink channel. SRS transmissions can also be used for uplink timing estimation and for estimating downlink channel conditions under the assumption of reciprocity between the downlink and uplink channels.

[0004] Currently, enhancements to SRS capacity and coverage have been approved in LTE Release 16. More than one symbol in a normal subframe can be used for SRS transmission in LTE Release 16, with SRS transmitted at symbols other than the last symbol in the normal subframe referred to as supplementary SRS. Aperiodic SRS transmissions for (multiple) supplementary SRS symbols can be configured in any symbol except the last symbol in the normal subframe. SRS transmitted at the last symbol in a normal subframe is referred to as conventional SRS.

[0005] Traditionally, repetition is not supported for conventional SRS, and frequency hopping is only supported for periodic SRS transmitted in normal subframes.

[0006] In TS 36.211, the reference signal sequence From basic sequence The cyclic shift α is limited by the following:

[0007]

[0008] in It is the length of the reference signal sequence and and This is the maximum UL bandwidth. Multiple reference signal sequences are defined from a single fundamental sequence by different values ​​of α.

[0009] basic sequence They are divided into groups, where u∈{0,1,...,29} are group numbers and v is the basic sequence number within the group, such that each group contains each length A basic sequence (v=0) and each length Two basic sequences (v = 0, 1). The sequence group number u and the number within the group v can change over time.

[0010] For group transitions, time slot n s The sequence group number u is changed by the group transition pattern f gh (n s ) and sequence shift mode f ss Based on the following limitations:

[0011] u=(f gh (n s )+f ss mod30

[0012] There are 17 different hopping modes and 30 different sequence shift modes. Sequence-group hopping can be enabled or disabled using the cell-specific parameter Group-hopping-enabled provided by higher layers.

[0013] The group transition modes can be different for PUSCH, (S)PUCCH, and SRS, and are given as follows:

[0014]

[0015] The pseudo-random sequence c(i) is defined by Clause 7.2 of TS 36.211. The pseudo-random sequence generator shall utilize [the appropriate method] at the beginning of each radio frame. Initialized, where, As given in Clause 5.5.1.5 of TS 36.211.

[0016] For SRS, sequence shift mode Depend on Given, among which, As given in Clause 5.5.1.5 of TS 36.211.

[0017] Sequence transitions only apply to length Reference signal.

[0018] For length The reference signal is given by the basic sequence number v within the basic sequence group, which is given by v=0.

[0019] For length The reference signal, time slot n s The basic sequence number v within the basic sequence group in the sequence is defined by the following:

[0020]

[0021] The pseudo-random sequence c(i) is given in Clause 7.2. Whether sequence transitions are enabled is determined by the parameters provided by the higher layer.

[0022] For SRS, a pseudo-random sequence generator should be used at the beginning of each radio frame. Initialized, where, As given in Clause 5.5.1.5, and Δ ss As given in Clause 5.5.1.3.

[0023] It has been agreed that antenna switching and / or frequency hopping (group hopping or sequence hopping) and / or repetition will be supported for aperiodic supplemental SRS transmissions. However, detailed configurations have not yet been studied. Summary of the Invention

[0024] The purpose of this application is to provide detailed SRS configurations to support antenna switching and / or frequency hopping and / or repetition. Specifically, methods and apparatus for SRS configuration and transmission are disclosed.

[0025] In one embodiment, a method at a base station unit includes: configuring one or more sets of higher-layer parameters for an SRS transmission having at least one of frequency hopping, repetition, and antenna switching; and transmitting a DCI containing a non-zero SRS request field or transmitting higher-layer signaling to trigger an SRS transmission in a symbol within one or more normal subframes.

[0026] In some embodiments, one of the parameter sets for an aperiodic SRS transmission comprises 2-hop intra-subframe frequency hopping, where Ns = 4 and R = 2, or Ns = 6 and R = 3, or Ns = 8 and R = 4, each hop having the same bandwidth and each of the antenna ports used to transmit the SRS being mapped to the same set of subcarriers, where Ns is the number of SRS symbols configured to transmit the SRS and R is the repetition factor. Without a configured guard period, the start symbol of the SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10} corresponding to Ns = 4, or one of {0, 1, 2, 3, 4, 5, 6, 7, 8} corresponding to Ns = 6, or one of {0, 1, 2, 3, 4, 5, 6} corresponding to Ns = 8. Under the condition of configuring a protection period of one symbol for frequency hopping, the start symbol of SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} corresponding to Ns=4, or as one of {0, 1, 2, 3, 4, 5, 6, 7} corresponding to Ns=6, or as one of {0, 1, 2, 3, 4, 5} corresponding to Ns=8.

[0027] In some embodiments, a periodic SRS with intra- and inter-subframe frequency hopping in the parameter set comprises Ns = 2 or 4 symbols in a subframe, and for all antenna ports, the SRS occupies one or more identical symbol positions in each subframe, where Ns is the number of SRS symbols configured for transmitting the SRS in a subframe. When frequency hopping is configured and Ns = 4 in a subframe and the repetition factor R = 2 or 4, each of the adjacent symbols in each antenna port across each subframe is mapped to a different set of subcarriers, and each of the antenna ports is mapped to the same set of subcarriers within each repetition of adjacent symbols in each subframe. When Ns = R = 2 or 4 and frequency hopping is configured, each of the antenna ports is mapped to the same set of subcarriers within each repetition of adjacent symbols in each subframe. Without a protection period configured, the start symbol of the SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12} corresponding to Ns=2, or as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10} corresponding to Ns=4. With a protection period configured for frequency hopping, the start symbol of the SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11} corresponding to Ns=2, or as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} corresponding to Ns=4.

[0028] In some embodiments, an aperiodic SRS transmission for antenna handover of a UE with 1T4R capability without a guard period, according to the parameter set, comprises: Nst-total = 8 symbols in one subframe with 2-hop intra-subframe frequency hopping, or Nst-total = 16 symbols in two subframes with 4-hop intra-subframe frequency hopping, where Nst-total is the number of adjacent SRS symbols configured for SRS. In other embodiments, an aperiodic SRS transmission for antenna handover of a UE with 1T4R capability and a guard period for intra-subframe antenna handover, according to the parameter set, comprises: Nst-total = 11 symbols in one subframe with 2-hop intra-subframe frequency hopping, or Nst-total = 18 symbols in two subframes with 4-hop intra-subframe frequency hopping, where Nst-total is the number of adjacent SRS symbols configured for SRS. The full probe bandwidth of each antenna port is twice the bandwidth of a subband spanning two adjacent symbols in a subframe, and each antenna port in a subframe is mapped to those two adjacent symbols; or the full probe bandwidth of each antenna port is four times the bandwidth of a subband spanning four adjacent symbols in a subframe, and each antenna port in a subframe is mapped to those four adjacent symbols, with different antenna ports mapped to different symbols. For an aperiodic SRS transmission spanning two normal subframes, with Nst-total = 16 or 18 symbols and 4-hop frequency hopping and antenna switching, two antenna ports are transmitted in each subframe, or one antenna port is transmitted in one subframe and three additional antenna ports are transmitted in another subframe.

[0029] In some embodiments, an aperiodic SRS transmission for antenna handover of a UE with 1T4R capability without a guard period, comprising: Nst-total = 8 in one subframe with a repetition factor R = 2, or Nst-total = 12 in one subframe with a repetition factor R = 3, or Nst-total = 16 in two subframes with a repetition factor R = 4, wherein Nst-total is the number of adjacent SRS symbols configured for SRS. In other embodiments, an aperiodic SRS transmission for antenna handover of a UE with 1T4R capability and with a guard period for intra-subframe antenna handover, comprising: Nst-total = 11 in one subframe with a repetition factor R = 2, or Nst-total = 14 in one subframe with a repetition factor R = 3, or Nst-total = 18 in two subframes with a repetition factor R = 4, wherein Nst-total is the number of adjacent SRS symbols configured for SRS. In all R adjacent symbols, each of the antenna ports is mapped to the same set of subcarriers, and different antennas are mapped to different symbols. When for an aperiodic SRS transmission spanning two normal subframes, with Nst-total = 16 or 18 symbols and a repetition factor R = 4 and antenna switching, two antenna ports are transmitted in each subframe, or one antenna port is transmitted in one subframe and another three antenna ports are transmitted in the other subframe.

[0030] In some embodiments, the method includes transmitting a DCI with a non-zero SRS request field to trigger an aperiodic SRS transmission across at least two normal subframes. The aperiodic SRS triggered by a single DCI can be transmitted in both the additional SRS symbol and the conventional SRS symbol.

[0031] In another embodiment, a method at a remote unit includes: receiving a DCI containing a non-zero SRS request field or receiving higher-layer signaling to trigger SRS transmission in a symbol in one or more normal subframes; and transmitting SRS in the triggered symbol in one or more normal subframes.

[0032] In yet another embodiment, the base station unit includes a processor configured with one or more higher-layer parameter sets for SRS transmission having at least one of frequency hopping, repetition, and antenna switching; and a transceiver that transmits a DCI containing a non-zero SRS request field or transmits higher-layer signaling to trigger SRS transmission in symbols within one or more normal subframes.

[0033] In another embodiment, the remote unit includes: a receiver that receives a DCI containing a non-zero SRS request field or receives higher-layer signaling to trigger SRS transmission in a symbol in one or more normal subframes; and a transmitter that transmits SRS in the triggered symbol in one or more normal subframes.

[0034] Those skilled in the art will understand that the effects achievable by this disclosure are not limited to those specifically described above, and that the above and other effects achievable by this disclosure will become clearer from the following detailed description. Attached Figure Description

[0035] A more specific description of the embodiments briefly described above will be presented with reference to the specific embodiments shown in the accompanying drawings. It should be understood that these drawings depict only some embodiments and are therefore not to be considered as limiting the scope; the embodiments will be described and illustrated with additional details and nuances using the drawings, wherein:

[0036] Figure 1 (a) and (b) are schematic diagrams illustrating conventional SRS transmission;

[0037] Figure 2 This is a schematic diagram illustrating the additional SRS transmission.

[0038] Figure 3 This is a schematic diagram illustrating concurrent transmission of supplemental SRS and traditional SRS;

[0039] Figure 4 This is a flowchart illustrating the methods used for SRS configuration and transmission;

[0040] Figure 5 (a), (b) and (c) illustrate examples of aperiodic SRS transmission according to the second embodiment;

[0041] Figure 6 (a), (b) and (c) illustrate examples of aperiodic SRS transmission according to the third embodiment;

[0042] Figure 7 (a) and (b) illustrate examples of aperiodic SRS transmission according to the fourth embodiment;

[0043] Figure 8 The diagram illustrates periodic SRS transmission according to the fifth embodiment;

[0044] Figure 9 The diagram illustrates periodic SRS transmission according to the sixth embodiment;

[0045] Figure 10 (a), (b), (c) and (d) illustrate aperiodic SRS transmission of a UE with 2T4R according to the seventh embodiment;

[0046] Figure 11 (a), (b), (c) and (d) illustrate aperiodic SRS transmission of a UE with 2T4R according to the eighth embodiment;

[0047] Figure 12 The illustration shows an aperiodic SRS transmission of a UE with 1T4R according to the ninth embodiment;

[0048] Figure 13 The illustration shows an aperiodic SRS transmission of a UE with 1T4R according to the tenth embodiment;

[0049] Figure 14 The illustration shows the aperiodic SRS transmission of a UE with 1T4R according to the eleventh embodiment;

[0050] Figure 15 The illustration shows the aperiodic SRS transmission of a UE with 1T4R according to the twelfth embodiment;

[0051] Figure 16 (a) and (b) illustrate a first example of aperiodic SRS transmission according to the thirteenth embodiment;

[0052] Figure 17 (a) and (b) illustrate a second example of aperiodic SRS transmission according to the thirteenth embodiment;

[0053] Figure 18 The illustration shows a third example of aperiodic SRS transmission according to the thirteenth embodiment;

[0054] Figure 19 The illustration shows a fourth example of aperiodic SRS transmission according to the thirteenth embodiment;

[0055] Figure 20 The illustration shows a fifth example of aperiodic SRS transmission according to the thirteenth embodiment;

[0056] Figure 21 The illustration shows a sixth example of aperiodic SRS transmission according to the thirteenth embodiment; and

[0057] Figure 22 This is a schematic block diagram illustrating an apparatus according to one embodiment. Detailed Implementation

[0058] As will be appreciated by those skilled in the art, certain aspects of the embodiments may be embodied as a system, apparatus, method, or program product. Therefore, embodiments may take the form of a completely hardware embodiment, a completely software embodiment (including firmware, resident software, microcode, etc.), or an embodiment combining software and hardware aspects, which may generally be referred to herein as “circuit,” “module,” or “system.” Furthermore, embodiments may take the form of a program product embodied in one or more computer-readable storage devices, referred to hereinafter as “code,” storing machine-readable code, computer-readable code, and / or program code. The storage device may be a tangible, non-transitory, and / or non-transferable storage device. The storage device may not embody signals. In one embodiment, the storage device uses only signals for accessing the code.

[0059] Certain functional units described in this specification may be labeled "modules" to give more specific emphasis to their independent implementation. For example, a module may be implemented as a hardware circuit that includes custom very-large-scale integration (VLSI) circuitry or gate arrays, off-the-shelf semiconductors such as logic chips, transistors, or other discrete components. Modules may also be implemented as programmable hardware devices such as field-programmable gate arrays, programmable array logic, programmable logic devices, etc.

[0060] Modules can also be implemented as code and / or software for execution by various types of processors. The identified code module can, for example, comprise one or more physical or logical blocks of executable code, which can be organized, for example, as objects, procedures, or functions. However, the executable files of the identified modules do not necessarily need to be physically located together, but can include fundamentally different instructions stored in different locations that, when logically joined together, comprise the module and implement the stated purpose of the module.

[0061] In practice, a code module can contain a single instruction or many instructions, and can even be distributed across several different code segments within different programs, and across several memory devices. Similarly, operational data herein can be identified and illustrated within a module, and can be represented in any suitable form and organized within any suitable type of data structure. This operational data can be collected as a single dataset, or it can be distributed across different locations, including different computer-readable storage devices. Where a module or part of a module is implemented in software, the software portion is stored on one or more computer-readable storage devices.

[0062] Any combination of one or more computer-readable media may be used. A computer-readable medium may be a computer-readable storage medium. A computer-readable storage medium may be a storage device for storing code. A storage device may be, for example, but not necessarily, an electronic, magnetic, optical, electromagnetic, infrared, holographic, micromechanical, or semiconductor system, apparatus, or device, or any suitable combination thereof.

[0063] A non-exhaustive list of more specific examples of storage devices will include the following: electrical connections having one or more cables, portable computer floppy disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable optical disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing. In the context of this document, a computer-readable storage medium can be any tangible medium capable of containing or storing a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0064] The code used to perform the operations of the embodiments may include any number of lines and may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Python, Ruby, Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C", and / or machine languages ​​such as assembly language. The code may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may make a connection to an external computer (e.g., via the Internet through an Internet service provider).

[0065] Throughout this specification, references to "an embodiment," "embodiment," or similar language mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in at least one embodiment. Therefore, unless otherwise expressly specified, the phrases "in an embodiment," "in an embodiment," and similar language appearing throughout this specification may, but not necessarily all, refer to the same embodiment, but rather mean "one or more, but not all, embodiments." Unless otherwise expressly specified, the terms "comprising," "including," "having," and variations thereof mean "including, but not limited to,". Unless otherwise expressly specified, the enumerated list of items does not imply that any or all of these items are mutually exclusive. Unless otherwise expressly specified, the terms "a," "an," and "the" also mean "one or more".

[0066] Furthermore, the features, structures, or characteristics of the various embodiments described can be combined in any suitable manner. Numerous specific details, such as examples of programming, software modules, user selection, network transactions, database queries, database structures, hardware modules, hardware circuits, hardware chips, etc., are provided in the following description to provide a thorough understanding of the embodiments. However, those skilled in the art will recognize that the embodiments can be practiced without one or more of the specific details or using other methods, components, materials, etc. In other instances, well-known structures, materials, or operations have not been shown or described in detail to avoid obscuring aspects of the embodiments.

[0067] Various aspects of different embodiments are described below with reference to schematic flowcharts and / or schematic block diagrams of methods, apparatus, systems, and program products according to embodiments. It should be understood that each block in the schematic flowcharts and / or schematic block diagrams, as well as combinations of blocks in the schematic flowcharts and / or schematic block diagrams, can be implemented by code. This code can be provided to a processor of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus to generate machinery, such that instructions executed via the processor of the computer or other programmable data processing apparatus, create means for the blocks or blocks to implement the functions / behaviors specified in the schematic flowcharts and / or schematic block diagrams.

[0068] Code may also be stored in a storage device, which can instruct a computer, other programmable data processing device or other device to function in a particular manner, such that the instructions stored in the storage device produce an article of writing, which includes instructions that implement the functions specified in the schematic flowchart and / or schematic block diagram boxes or blocks.

[0069] Code may also be loaded onto a computer, other programmable data processing apparatus or other device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other device to produce a computer-implemented process, such that the code executing on the computer or other programmable apparatus provides a process for implementing the functions specified in the flowchart and / or block diagram boxes or blocks.

[0070] The schematic flowcharts and / or block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, systems, methods, and program products according to various embodiments. In this regard, each block in the schematic flowcharts and / or block diagrams may represent a module, segment, or portion of code, which includes one or more executable instructions for implementing the specified logical function.

[0071] It should also be noted that in some alternative implementations, the functions annotated in the boxes may occur in a different order than those annotated in the figures. For example, depending on the functions involved, two boxes shown sequentially may be executed substantially simultaneously, or sometimes in reverse order. One or more blocks or portions thereof that are functionally, logically, or effectively equivalent to those in the illustrated figures are conceivable.

[0072] While various arrow and line types may be used in flowcharts and / or block diagrams, they are not intended to limit the scope of the corresponding embodiments. In practice, some arrows or other connectors may be used only to indicate the logical flow of the depicted embodiment. For example, an arrow may indicate a wait or monitoring period of unspecified duration between enumerated steps of the depicted embodiment. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented by a system based on dedicated hardware, or a combination of dedicated hardware and code, that performs the specified function or behavior.

[0073] The description of the elements in each figure can be referenced to the elements in the preceding figures. In all figures, similar numerals refer to similar elements, including alternative embodiments of similar elements.

[0074] Figure 1 (a) and (b) are schematic diagrams illustrating conventional SRS transmission.

[0075] There are two types of SRS transmissions defined in LTE Release 15: periodic SRS transmissions triggered by higher-layer signaling and aperiodic SRS transmissions (which can be referred to as Type 1 SRS) triggered by DCI. For example... Figure 1 (a) As illustrated, the UE transmits SRS at a specific period, such as N subframes, which is controlled by higher-layer signaling ( Figure 1 (A) Configuration not shown. SRS can only be transmitted at the last symbol of a normal subframe in LTE Release 15. For example... Figure 1 As shown in (b), the UE responds to the DCI (shown as...). Figure 1 (b) The DCI containing the SRS request sends an aperiodic SRS (shown as...). Figure 1 (b) is the probe reference signal.

[0076] Additional SRS was introduced in LTE Release 16 to enhance SRS capacity. It is possible to transmit additional SRS at any symbol except the last symbol in a normal subframe.

[0077] Figure 2 This is a schematic diagram illustrating the additional SRS transmission.

[0078] like Figure 2As shown, the UE transmits an aperiodic SRS triggered by a received DCI containing an SRS request field. The aperiodic SRS is transmitted at symbols 10, 11, 12, and 13 in the normal subframe.

[0079] Incidentally, it is well known that a subframe consists of 14 symbols, referred to as symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and 13, or symbols 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14. Obviously, symbols 10, 11, 12, and 13 can also be referred to as symbols 9, 10, 11, and 12.

[0080] Figure 3 This is a schematic diagram illustrating concurrent transmission of Additional SRS and Traditional SRS.

[0081] Aperiodic supplementary SRS and aperiodic conventional SRS can be transmitted in the same subframe. For example... Figure 3 As shown, the DCI containing the SRS request field triggers the transmission of aperiodic supplementary SRS and aperiodic conventional SRS. Supplementary SRS is transmitted at symbols 10, 11, 12, and 13 in the subframe (i.e., symbols 9, 10, 11, and 12), while conventional SRS is transmitted only at symbol 14 (i.e., symbol 13), which is the last symbol in the same subframe.

[0082] Figure 4 This is a flowchart illustrating the methods used for SRS configuration and transmission.

[0083] In step 410, the base station configures one or more sets of higher-layer parameters to support SRS transmissions that support at least one of frequency hopping, repetition, and antenna switching.

[0084] The above is for reference only. Figures 1 to 3 The description only describes SRS transmissions via the UE and does not mention the antenna (or antenna port). As will be understood by those skilled in the art, the UE may have more than one antenna port for performing the transmission.

[0085] Frequency hopping means that a particular antenna port transmits SRS across multiple symbols in more than one set of subcarriers. That is, a particular antenna port transmits SRS in one set of subcarriers in one symbol, and then hops to another set of subcarriers in another symbol (i.e., transmits SRS in another set of subcarriers). If there are N sets of subcarriers on which a particular antenna port transmits SRS, they are called N-hop frequency hopping.

[0086] In the following disclosure, the set of subcarriers on which a particular antenna port transmits SRS is referred to as a subband. It should be noted that there may be more than one set of subcarriers in a subband.

[0087] Repetition means that a particular antenna port transmits SRS in more than one symbol using the same configuration parameters. The repetition factor "R" refers to the duration of SRS transmissions by a particular antenna port in the same subband (more specifically, in the same set of subcarriers). For example, a repetition factor of 2 means that a particular antenna port repeatedly transmits SRS in two symbols (e.g., two consecutive symbols).

[0088] Multiple antenna ports of a UE can perform transmissions simultaneously or not. For antenna ports that cannot transmit simultaneously, antenna switching means that after one or more antenna ports that can perform transmissions simultaneously (e.g., SRS) have performed a transmission, one or more other antenna ports that cannot perform transmissions simultaneously with those one or more antenna ports can perform transmissions (e.g., SRS).

[0089] Each higher-layer parameter set includes at least one symbol occupied by the corresponding SRS transmission, i.e., "l" symbols, where, in, This refers to the number of SRS symbols configured. Detailed SRS configuration will be discussed later.

[0090] In step 420, the UE receives a set of higher-layer parameters for SRS transmission.

[0091] In step 430, the base station transmits a DCI containing a non-zero SRS request field to trigger aperiodic SRS transmission in one or more symbols in a normal subframe. Incidentally, under periodic SRS transmission conditions, higher-layer signaling, rather than a DCI containing a non-zero SRS request field, is used to trigger periodic SRS transmission.

[0092] In step 440, the UE receives a DCI containing a non-zero SRS request field to trigger an aperiodic SRS transmission. Similarly, in the case of a periodic SRS transmission, the UE receives higher-layer signaling to trigger a periodic SRS transmission.

[0093] In step 450, upon receiving a DCI for triggering SRS transmission (or, in the case of periodic SRS transmission, receiving higher-layer signaling), the UE transmits SRS in one or more triggering symbols within one or more normal subframes based on a set of higher-layer parameters associated with the received SRS request value contained in the SRS request field. Specifically, the UE performs group hopping or sequence hopping according to a frequency hopping mode based at least on the configured number of SRS symbols. And the number of symbols occupied by the corresponding SRS transmission. To determine this. Specifically, if group transitions are enabled and sequence transitions are disabled, the UE utilizes the mode. To perform group transitions. If group transitions are disabled and sequence transitions are enabled, the UE utilizes the mode. To perform sequence transitions, where the pseudo-random sequence c(i) is constrained as follows:

[0094] c(i) = (x1(i+N) + x2(i+N)) mod 2

[0095] x1(i+31)=(x1(i+3)+x1(i))mod2

[0096] x2(i+31)=(x2(i+3)+x2(i+2)+x2(i+1)+x2(i))mod2

[0097] Where N = 1600, and the first m-sequence should be initialized using x1(0) = 1, x1(i) = 0, i = 1, 2, ..., 30. The second m-sequence is initialized at the beginning of each radio frame by... It means that, among them, It is the virtual cell ID used for SRS, and Δ ss ∈{0,1,…,29}.

[0098] Alternatively, for periodic transmissions, the UE can count the number of UE-specific SRS transmissions based on the following:

[0099]

[0100] Among them, T SRS It is a UE-specific periodicity of SRS transmission, T offset It is the SRS subframe offset, and T offset_max T is a specific configuration of SRS subframe offset. offset The maximum value of N. SP n is the number of downlink-to-uplink switching points within a radio frame. f It is the system frame number, and n s It is the slot number within the radio frame. R is the repetition factor.

[0101] The following section will describe in detail the configuration of SRS transmission that supports at least one of frequency hopping, repetition, and antenna switching.

[0102] In the following description, "Nst" refers to the above. That is, the number of adjacent symbols configured for SRS; "Ns" represents the number of symbols configured for actual transmission of SRS, taking into account that one or more configured symbols can be used as guard periods; the repetition factor "R" (or "repetition") represents the repetition time of SRS transmitted using the same configuration parameters, the same set of subcarriers, and the same antenna port.

[0103] According to the first embodiment, frequency hopping is not configured in a subframe, the repetition of "R" is configured to be equal to Nst, and no guard period is configured (i.e., Ns = Nst). The antenna ports in this subframe are mapped to the same set of subcarriers in all Nst symbols. The SRS transmission according to the first embodiment can be periodic or aperiodic.

[0104] According to the second embodiment, the UE can be configured with Nst = 2, 4, or 8 adjacent symbols without a guard period (i.e., Ns = Nst) and repetition R = 1 (i.e., no repetition). The Ns symbols are adjacent within the subframe. Frequency hopping is intra-subframe. Assuming the bandwidth of each subband is the same, the full hopping bandwidth is Ns times the bandwidth of the subband on the configured symbol.

[0105] Figure 5 Figures (a), (b), and (c) illustrate examples of aperiodic SRS transmission according to the second embodiment, wherein... Figure 5 (a) Indicates Ns = 2 and R = 1; Figure 5 (b) Indicates Ns = 4 and R = 1; Figure 5 (c) Indicates Ns = 8 and R = 1. For example... Figure 5 As shown in (a), at symbol #0, SRS is transmitted in subband #2, and at symbol #1, SRS is transmitted in subband #1. Figure 5 (b) and Figure 5 In (c), SRS is sent at different symbols and in different subbands.

[0106] exist Figure 5 In this configuration, no protection period is configured. For some UEs, a protection period for a symbol may be necessary between different hops (e.g., changing from subband #2 to subband #1). Changing from one subband (e.g., subband #2) to another subband (e.g., subband #1) signifies frequency hopping. The number of subbands (e.g., the two subbands represented by subband #2 and subband #1) indicates the number of hops in the frequency hopping process. That is, Figure 5 (a) Indicates 2-hop frequency hopping; Figure 5 (b) Indicates 4-hop frequency hopping; and Figure 5 (c) Indicates 8-hop frequency hopping.

[0107] According to the third embodiment, the UE can be configured with two subbands without guard periods, and the repetition R is greater than 1. The number of subbands is calculated by dividing "Ns" by "R" (i.e., 2 in this embodiment). In the third embodiment, "Ns" and "R" can be set to "Ns=4, R=2" or "Ns=6, R=3" or "Ns=8, R=4". Therefore, in the third embodiment, 2-hop frequency hopping is configured. The full hopping bandwidth is equal to Ns / R (i.e., 2 = the number of hops) multiplied by the bandwidth of the subband across the configured symbols. The antenna ports for SRS transmission are mapped to the same subband within R adjacent symbols for repetition.

[0108] Figure 6 Figures (a), (b), and (c) illustrate examples of aperiodic SRS transmission according to the third embodiment, wherein... Figure 6 (a) Indicates Ns = 4 and R = 2; Figure 6 (b) Indicates Ns = 6 and R = 3; and Figure 6 (c) Indicate Ns=8 and R=4.

[0109] like Figure 6 As shown in (a), at symbol #0, SRS is transmitted in subband #2; and at symbol #1, SRS is repeatedly transmitted in subband #2. That is, the antenna port for SRS transmission is mapped to the same subband #2 within two adjacent symbols (i.e., symbols #0 and #1) for repetition. At symbol #2, SRS is transmitted in subband #1; at symbol #3, SRS is repeatedly transmitted in subband #1. That is, the antenna port for SRS transmission is mapped to the same subband #1 within two adjacent symbols (i.e., symbols #2 and #3) for repetition.

[0110] exist Figure 6 In (b), the SRS is repeatedly transmitted three times in subband #2 at symbols #0, #1 and #2, wherein the antenna port for the SRS transmission is mapped to the same subband #2 within three adjacent symbols (i.e., symbols #0, #1 and #2) for repetition; and the SRS is repeatedly transmitted three times in subband #1 at symbols #3, #4 and #5.

[0111] exist Figure 6 In (c), the SRS is repeatedly transmitted four times in subband #2 at symbols #0, #1, #2 and #3, wherein the antenna port for the SRS transmission is mapped to the same subband #2 within four adjacent symbols (i.e., symbols #0, #1, #2 and #3) for repetition; and the SRS is repeatedly transmitted four times in subband #1 at symbols #4, #5, #6 and #7.

[0112] exist Figure 6In (a), (b), and (c), the start symbol for the SRS transmission is configured as symbol #0. For Figure 6 As shown in (a), with Ns=4 and R=2, the start symbol for the SRS transmission can alternatively be configured as symbol #1, symbol #2, symbol #3, symbol #4, symbol #5, symbol #6, symbol #7, symbol #8, symbol #9, or symbol #10. For Figure 6 As shown in (b) with Ns=6 and R=3, the start symbol for the SRS transmission can alternatively be configured as symbol #1, symbol #2, symbol #3, symbol #4, symbol #5, symbol #6, symbol #7, or symbol #8. For Figure 6 As shown in (c), with Ns=8 and R=4, the start symbol for the SRS transmission can be alternatively configured as symbol #1, symbol #2, symbol #3, symbol #4, symbol #5, or symbol #6.

[0113] exist Figure 6 In the first embodiment, no protection period is configured. In a variant of the third embodiment, when the subband changes (e.g., from subband #2 to subband #1), a protection period for a symbol can be configured. In this case, if Ns is 4, then considering the protection period for a symbol, Nst is 5, and the starting symbol of the SRS transmission can be configured as symbol #0, symbol #1, symbol #2, symbol #3, symbol #4, symbol #5, symbol #6, symbol #7, symbol #8, or symbol #9. If Ns is 6, then considering the protection period for a symbol, Nst is 7, and the starting symbol of the SRS transmission can be configured as symbol #0, symbol #1, symbol #2, symbol #3, symbol #4, symbol #5, symbol #6, or symbol #7. If Ns is 8, then considering the protection period for a symbol, Nst is 9, and the starting symbol of the SRS transmission can be configured as symbol #0, symbol #1, symbol #2, symbol #3, symbol #4, or symbol #5.

[0114] According to the fourth embodiment, the UE can be configured to have an SRS transmission in a subframe without a guard period, with frequency hopping and repetition. Different "R" values ​​can be configured for the same "Nst" (or the same Ns), resulting in different numbers of frequency hopping.

[0115] Figure 7 (a) and (b) illustrate examples of aperiodic SRS transmission according to the fourth embodiment, wherein Figure 7 (a) Indicates Nst=Ns=8 (Nst=Ns means no protection period), R=2 (i.e., 2 repetitions and 4 (=Ns / R=8 / 2) frequency hopping); and Figure 7 (b) Indicates Nst = Ns = 8, R = 4 (i.e., 4 repetitions and 2 (= 8 / 4) hop frequency).

[0116] like Figure 7 As shown in (a), at symbol #0, SRS is transmitted in subband #4; and at symbol #1, SRS is repeatedly transmitted in subband #4. That is, the antenna port for SRS transmission is mapped to the same subband #4 within two adjacent symbols (i.e., symbols #0 and #1) for repetition. At symbol #2, SRS is transmitted in subband #2; at symbol #3, SRS is repeatedly transmitted in subband #2. At symbol #4, SRS is transmitted in subband #3; and at symbol #5, SRS is repeatedly transmitted in subband #3. At symbol #6, SRS is transmitted in subband #1; and at symbol #7, SRS is repeatedly transmitted in subband #1.

[0117] exist Figure 7 In (b), the SRS is repeatedly transmitted four times in subband #2 at symbols #0, #1, #2, and #3. That is, the antenna ports for SRS transmission are mapped to the same subband #2 within four adjacent symbols (i.e., symbols #0, #1, #2, and #3) for repetition. Additionally, the SRS is repeatedly transmitted four times in subband #1 at symbols #4, #5, #6, and #7.

[0118] According to the second to fourth embodiments, frequency hopping is intra-subframe frequency hopping (i.e., frequency hopping is performed within one subframe). According to the fifth embodiment, frequency hopping is both intra-subframe and inter-subframe (i.e., frequency hopping is performed across more than one subframe). The UE can be configured with SRS of Nst = Ns = 2, 4, or 8 symbol periods using intra-subframe and inter-subframe hopping, and the repetition R is greater than 1, where since more than one subframe is configured for inter-subframe frequency hopping, Nst represents the number of adjacent SRS symbols configured in a configured subframe, and Ns represents the number of configured SRS symbols used for actual SRS transmission in a configured subframe. The number of subbands is calculated by multiplying “Ns” by the number of configured subframes (called “CS”) used for a full-band detection and dividing the result by “R” (i.e., Ns*CS / R). The antenna ports for SRS transmission are mapped to the same subband within R adjacent symbols for repetition. SRS transmission can occupy the same symbol position in each subframe (e.g., each of two subframes).

[0119] Figure 8 The diagram illustrates a periodic SRS transmission according to the fifth embodiment, where Nst = Ns = 4 and R = 2, and two configuration subframes (CS) are used for a fully probed configuration. Figure 8As shown, at symbol #0 of the first configuration subframe, SRS is transmitted in subband #4; and at symbol #1 of the first configuration subframe, SRS is repeatedly transmitted in subband #4. At symbol #2 of the first configuration subframe, SRS is transmitted in subband #2; and at symbol #3 of the first configuration subframe, SRS is repeatedly transmitted in subband #2. At symbol #0 of the second configuration subframe, SRS is transmitted in subband #3; and at symbol #1 of the second configuration subframe, SRS is repeatedly transmitted in subband #3. At symbol #2 of the second configuration subframe, SRS is transmitted in subband #1; and at symbol #3 of the second configuration subframe, SRS is repeatedly transmitted in subband #1.

[0120] from Figure 8 It can be seen that the same symbol positions (i.e., symbols #0 to #3) are occupied in each of the two configuration subframes. Within the same subframe, the SRS is transmitted in two different subbands (e.g., subbands #2 and #4 in the first configuration subframe, and subbands #1 and #3 in the second configuration subframe). Furthermore, the antenna ports for SRS transmission are mapped to the same subband #4 within R (=2) adjacent symbols (i.e., symbols #0 and #1 in the first configuration subframe) for repetition, the same subband #2 within R (=2) adjacent symbols (i.e., symbols #2 and #3 in the first configuration subframe) for repetition, the same subband #3 within R (=2) adjacent symbols (i.e., symbols #0 and #1 in the second configuration subframe) for repetition, and the same subband #1 within R (=2) adjacent symbols (i.e., symbols #2 and #3 in the second configuration subframe) for repetition.

[0121] Figure 8The starting symbol for SRS transmission is shown as symbol #0. When Nst = Ns = 2, the starting symbol for SRS transmission can alternatively be configured as symbol #1, symbol #2, symbol #3, symbol #4, symbol #5, symbol #6, symbol #7, symbol #8, symbol #9, symbol #10, symbol #11, or symbol #12. When Nst = Ns = 4, the starting symbol for SRS transmission can alternatively be configured as symbol #1, symbol #2, symbol #3, symbol #4, symbol #5, symbol #6, symbol #7, symbol #8, symbol #9, or symbol #10. Furthermore, if the protection period is configured for each hop of frequency hopping, then under the condition that Nst=3 and Ns=2, the start symbol of SRS transmission can be alternatively configured as symbol #1, symbol #2, symbol #3, symbol #4, symbol #5, symbol #6, symbol #7, symbol #8, symbol #9, symbol #10 or symbol #11; while under the condition that Nst=5 and Ns=4, the start symbol of SRS transmission can be alternatively configured as symbol #1, symbol #2, symbol #3, symbol #4, symbol #5, symbol #6, symbol #7, symbol #8 or symbol #9.

[0122] According to the sixth embodiment, frequency hopping is inter-subframe. The UE can be configured with Nst = Ns = R by utilizing inter-subframe hopping and intra-subframe repetition. SRS occupies the same symbol position in each subframe (e.g., each of two subframes). When Ns equals R, the number of subbands is equal to the number of subframes to be configured. The antenna ports for SRS transmission are mapped to the same subband within adjacent symbols for repetition.

[0123] Figure 9 The diagram illustrates a periodic SRS transmission according to the sixth embodiment, where Nst = Ns = R = 4, and the configuration subframes are 2.

[0124] like Figure 9 As shown, the SRS is repeatedly transmitted four times in subband #2 at symbols #0, #1, #2 and #3 in the first configuration subframe; and then, the SRS is repeatedly transmitted four times in subband #1 at symbols #0, #1, #2 and #3 in the second configuration subframe.

[0125] At least refer to Figure 5-9 The above disclosure of embodiments 1 to 6 describes only one antenna port used for transmitting SRS. Alternatively, if more than one antenna port can be used to perform (e.g., SRS) transmissions simultaneously, the term "antenna port" can be applied to "each antenna port," where antenna ports can perform transmissions simultaneously.

[0126] In the following embodiments, multiple antenna ports (which may or may not perform transmission simultaneously) can be used to transmit SRS. For example, the UE may have an xTyR capability (e.g., 1T2R, 2T4R, 1T4R, etc.), where y represents the number of antenna ports (or antenna ports that can be used for receiving simultaneously), and x represents the number of antenna ports that can be used for transmitting simultaneously.

[0127] According to the seventh embodiment, a UE with 1T2R or 2T4R capability can be configured with intra-subframe antenna switching and intra-subframe frequency hopping and / or repetition. No guard period is configured. For aperiodic SRS transmission, Ns (=Nst) can be configured to 4 or 8. The number of subbands is calculated by (Ns / R) / (y / x). According to the seventh embodiment, y=2 and x=1 (i.e., 1T2R) or y=4 and x=2 (i.e., 2T4R). Assuming that each subband has the same bandwidth, the full hopping bandwidth is (Ns / R) / (y / x) times the bandwidth of the subband on the configured symbol. Different antenna ports used for SRS transmission (i.e., those antenna ports that cannot perform transmission simultaneously) are mapped to different symbols.

[0128] Figure 10 Figures (a), (b), (c), and (d) illustrate aperiodic SRS transmission of a UE with 2T4R according to the seventh embodiment, wherein... Figure 10 (a) Indicates Nst = Ns = 4 and R = 1 with intra-frame antenna switching and intra-frame frequency hopping but no repetition (i.e., R = 1); Figure 10 (b) Indicates Nst = Ns = 8 and R = 1 with intra-frame antenna switching and intra-frame frequency hopping but without repetition; Figure 10 (c) Indicates Nst = Ns = 4 and R = 2 with intra-frame antenna switching and repetition but no frequency hopping; and Figure 10 (d) indicates Nst=Ns=8 and R=2 with intra-frame antenna switching and repetition but no frequency hopping.

[0129] like Figure 10As shown in (a), at symbol #0, antenna port 0, i.e., Tx#0, and antenna port 2, i.e., Tx#2 (which can perform transmission simultaneously), are used to transmit SRS in subband #2. At symbol #1, antenna ports 0 and 2 are used to transmit SRS in subband #1 (i.e., frequency hopping from subband #2 to subband #1 for antenna ports 0 and 2). At symbol #2, antenna ports 1, i.e., Tx#1, and antenna ports 3, i.e., Tx#3 (which can perform transmission simultaneously), are used to transmit SRS in subband #2 (i.e., antenna switching from antenna ports 0 and 2 (which can perform transmission simultaneously) to antenna ports 1 and 3 (which perform transmission simultaneously)). Antenna ports 0 and 2 cannot perform transmission simultaneously with antenna ports 1 and 3. At symbol #3, antenna ports 1 and 3 are used to transmit SRS in subband #1 (i.e., frequency hopping from subband #2 to subband #1 for antenna ports 1 and 3). Antenna ports 0 and 2 are mapped to symbols #0 and #1, which is different from symbols #2 and #3 mapped to antenna ports 1 and 3.

[0130] like Figure 10 As shown in (b), antenna ports 0 and 2 are used to transmit SRS in subband #4 at symbol #0, subband #3 at symbol #1, subband #2 at symbol #2, and subband #1 at symbol #3; while antenna ports 1 and 3 are used to transmit SRS in subband #4 at symbol #4, subband #3 at symbol #5, subband #2 at symbol #6, and subband #1 at symbol #7.

[0131] like Figure 10 As shown in (c), antenna ports 0 and 2 are used to transmit SRS in full band at symbols #0 and #1, while antenna ports 1 and 3 are used to transmit SRS in full band at symbols #2 and #3.

[0132] like Figure 10 As shown in (d), antenna ports 0 and 2 are used to transmit SRS in full band at symbols #0, #1, #2 and #3, while antenna ports 1 and 3 are used to transmit SRS in full band at symbols #4, #5, #6 and #7.

[0133] According to the eighth embodiment, a UE with 1T2R or 2T4R capability can be configured with intra-subframe antenna switching and intra-subframe frequency hopping and / or repetition, wherein a one-symbol guard period is added when antenna switching occurs. The difference between the eighth embodiment and the seventh embodiment is the one-symbol guard period.

[0134] Figure 11Figures (a), (b), (c), and (d) illustrate aperiodic SRS transmission of a UE with 2T4R according to the eighth embodiment, wherein... Figure 11 (a) Indicates Ns=4 (Nst=5, where one antenna switch has a guard period of one symbol) and R=1, which have intra-frame antenna switching and intra-frame frequency hopping but no repetition (i.e., R=1); Figure 11 (b) Indicates Ns=8 (Nst=9, where one antenna switch has a guard period of one symbol) and R=1, which have intra-frame antenna switching and intra-frame frequency hopping but no repetition; Figure 11 (c) Indicates Ns=4 (Nst=5, where one antenna switch has a one-symbol guard period) and R=2 with intra-frame antenna switching and repetition but no frequency hopping; and Figure 11 (d) indicates that there is intra-frame antenna switching and repetition but no frequency hopping Ns=8 (Nst=9, where one antenna switching has a guard period of one symbol) and R=2.

[0135] like Figure 11 As shown in (a), at symbol #0, antenna port 0 (Tx#0) and antenna port 2 (Tx#2) are used to transmit SRS in subband #2. At symbol #1, antenna ports 0 and 2 are used to transmit SRS in subband #1 (i.e., frequency hopping from subband #2 to subband #1 for antenna ports 0 and 2). At symbol #2, a guard period of one symbol is added when the antenna ports are switched from antenna ports 0 and 2 to antenna port 1 (Tx#1) and antenna port 3 (Tx#3). At symbol #3, antenna ports 1 and 3 are used to transmit SRS in subband #2. At symbol #4, antenna ports 1 and 3 are used to transmit SRS in subband #1 (i.e., frequency hopping from subband #2 to subband #1 for antenna ports 1 and 3). Antenna ports 0 and 2 are mapped to symbols #0 and #1, which are different from symbols #3 and #4 mapped by antenna ports 1 and 3.

[0136] like Figure 11 As shown in (b), antenna ports 0 and 2 are used to transmit SRS in subband #4 at symbol #0, subband #3 at symbol #1, subband #2 at symbol #2, and subband #1 at symbol #3. At symbol #4, when the antenna ports are switched from antenna ports 0 and 2 to antenna ports 1 and 3, a symbol guard period is added, and antenna ports 1 and 3 are used to transmit SRS in subband #4 of symbol #5, subband #3 of symbol #6, subband #2 of symbol #7, and subband #1 of symbol #8.

[0137] like Figure 11As shown in (c), antenna ports 0 and 2 are used to transmit SRS in the full band at symbols #0 and #1. At symbol #2, when the antenna ports are switched from antenna ports 0 and 2 to antenna ports 1 and 3, a symbol guard period is added, and antenna ports 1 and 3 are used to transmit SRS in the full band at symbols #3 and #4.

[0138] like Figure 11 As shown in (d), antenna ports 0 and 2 are used to transmit SRS in the full band at symbols #0, #1, #2, and #3. At symbol #4, when the antenna ports are switched from antenna ports 0 and 2 to antenna ports 1 and 3, a symbol guard period is added, and antenna ports 1 and 3 are used to transmit SRS in the full band at symbols #5, #6, #7, and #8.

[0139] According to the ninth embodiment, a UE with 1T4R capability can be configured to perform antenna switching between one or two subframes and intra-subframe frequency hopping without a guard period. The number of subbands is calculated using (Ns*CS / R) / (y / x), where y represents the number of antenna ports (or antenna ports that can be used simultaneously for reception), x represents the number of antenna ports that can be used simultaneously for transmission, and CS represents the number of subframes for a full-band detection configuration. According to the ninth embodiment, y = 4 and x = 1 (i.e., 1T4R). Assuming that each subband has the same bandwidth and the same number of symbols are configured for each subframe, the full hopping bandwidth is (Ns*CS / R) / (y / x) times the bandwidth of the subband across the configured symbols. Each antenna port in the subframe is mapped to (Ns*CS) / (y / x) adjacent symbols. Different antenna ports used for SRS transmission are mapped to different symbols. For example, Ns = Nst can be configured as 8, with one or two subframes (CS = 1 or 2) configured for aperiodic SRS transmission.

[0140] If each of multiple subframes is configured with different symbols to be used for SRS, the number of subbands can be calculated using (Ns-Total / R) / (y / x), where "Ns-Total" represents the total number of symbols used to actually transmit the SRS contained in all configured subframes. Each antenna port in a subframe is mapped to Ns-Total / 2 adjacent symbols. Incidentally, "Nst-total" can represent the total number of configured symbols contained in all configured subframes, which is equal to "Ns-total" plus the number of symbols used for guard periods.

[0141] Figure 12The figure illustrates the aperiodic SRS transmission of a UE with 1T4R according to the ninth embodiment, where Ns = Nst = 8 and CS = 2 (or Ns-Total = Nst-Total = 16 and CS = 2) and R = 1.

[0142] like Figure 12 As shown, antenna port 0, i.e. Tx#0, is used to transmit SRS at symbol #0 of the first configuration subframe in subband #4, at symbol #1 of the first configuration subframe in subband #2 after hopping from subband #4 to subband #2, at symbol #2 of the first configuration subframe in subband #3 after hopping from subband #2 to subband #3, and at symbol #3 of the first configuration subframe in subband #1 after hopping from subband #3 to subband #1. Antenna port 1, i.e., Tx#1, is used to transmit SRS at symbol #4 of the first configured subframe in subband #4, at symbol #5 of the first configured subframe in subband #2 after hopping from subband #4 to subband #2, at symbol #6 of the first configured subframe in subband #3 after hopping from subband #2 to subband #3, and at symbol #7 of the first configured subframe in subband #1 after hopping from subband #3 to subband #1. Antenna port 2, i.e., Tx#2, is used to transmit SRS at symbol #0 of the second configured subframe in subband #4, at symbol #1 of the second configured subframe in subband #2 after hopping from subband #4 to subband #2, at symbol #2 of the second configured subframe in subband #3 after hopping from subband #2 to subband #3, and at symbol #3 of the second configured subframe in subband #1 after hopping from subband #3 to subband #1. Antenna port 3, namely Tx#3, is used to transmit SRS at symbol #4 of the second configuration subframe in subband #4, at symbol #5 of the second configuration subframe in subband #2 after hopping from subband #4 to subband #2, at symbol #6 of the second configuration subframe in subband #3 after hopping from subband #2 to subband #3, and at symbol #7 of the second configuration subframe in subband #1 after hopping from subband #3 to subband #1.

[0143] like Figure 12 As shown, in the ninth embodiment, antenna port 0 and antenna port 1 are used to transmit SRS in the first configuration subframe, and antenna port 2 and antenna port 3 are used to transmit SRS in the second configuration subframe. According to the tenth embodiment, antenna port 0 is used to transmit SRS in the first configuration subframe, and antenna ports 1, 2, and 3 are used to transmit SRS in the second configuration subframe.

[0144] Figure 13The figure illustrates the aperiodic SRS transmission of a UE with 1T4R according to the tenth embodiment, wherein the total configuration symbol Ns-Total = Nst-Total = 16 (in the first configuration subframe, CS = 2, Ns = Nst = 4, and in the second configuration subframe, Ns = Nst = 12) and R = 1.

[0145] like Figure 13 As shown, antenna port 0, i.e., Tx#0, is used to transmit SRS at symbol #0 of the first configuration subframe in subband #4, at symbol #1 of the first configuration subframe in subband #2, at symbol #2 of the first configuration subframe in subband #3, and at symbol #3 of the first configuration subframe in subband #1. Antenna port 1, i.e., Tx#1, is used to transmit SRS at symbol #0 of the second configuration subframe in subband #4, at symbol #1 of the second configuration subframe in subband #2, at symbol #2 of the second configuration subframe in subband #3, and at symbol #3 of the second configuration subframe in subband #1. Antenna port 2, i.e., Tx#2, is used to transmit SRS at symbol #4 of the second configuration subframe in subband #4, at symbol #5 of the second configuration subframe in subband #2, at symbol #6 of the second configuration subframe in subband #3, and at symbol #7 of the second configuration subframe in subband #1. Antenna port 3, namely Tx#3, is used to transmit SRS at symbol #8 of the second configuration subframe in subband #4, at symbol #9 of the second configuration subframe in subband #2, at symbol #10 of the second configuration subframe in subband #3, and at symbol #11 of the second configuration subframe in subband #1.

[0146] In the tenth embodiment, one antenna port is used to transmit SRS in the first configuration subframe, and three antenna ports are used to transmit SRS in the second configuration subframe. Alternatively, three antenna ports may be used to transmit SRS in the first configuration subframe, and one antenna port may be used to transmit SRS in the second configuration subframe.

[0147] In the ninth and tenth embodiments, no guard period is configured when antenna handover occurs. According to the eleventh embodiment, a UE with 1T4R capability can be configured to perform antenna handover and intra-subframe frequency hopping within one or two subframes with a one-symbol guard period. Similar to the ninth and tenth embodiments, the number of subbands is calculated using (Ns-total / R) / (y / x). For example, if two subbands are configured (i.e., 2-hop frequency hopping), then Ns-total = 8 and Nst-total = 11 (i.e., three one-symbol guard periods are configured for three antenna handovers within one subframe). For another example, if four subbands are configured (i.e., 4-hop frequency hopping), then Ns-total = 16 and Nst-total = 18 (i.e., one one-symbol guard period is configured for one antenna handover within each of the two configured subframes).

[0148] Figure 14 The figure illustrates the aperiodic SRS transmission of a UE with 1T4R according to the eleventh embodiment, where Ns = 8 and Nst = 9 and CS = 2 (or Ns-Total = 16 and Nst-Total = 18 and CS = 2) and R = 1.

[0149] like Figure 14 As shown, antenna port 0, i.e., Tx#0, is used to transmit SRS at symbol #0 of the first configuration subframe in subband #4, at symbol #1 of the first configuration subframe in subband #2, at symbol #2 of the first configuration subframe in subband #3, and at symbol #3 of the first configuration subframe in subband #1. A symbol guard period (antenna switching from antenna port 0 to antenna port 1) is added at symbol #4 of the first configuration subframe. Antenna port 1, i.e., Tx#1, is used to transmit SRS at symbol #5 of the first configuration subframe in subband #4, at symbol #6 of the first configuration subframe in subband #2, at symbol #7 of the first configuration subframe in subband #3, and at symbol #8 of the first configuration subframe in subband #1. Antenna port 2, i.e., Tx#2, is used to transmit SRS at symbol #0 of the second configuration subframe in subband #4, at symbol #1 of the second configuration subframe in subband #2, at symbol #2 of the second configuration subframe in subband #3, and at symbol #3 of the second configuration subframe in subband #1. A symbol guard period is added at symbol #4 of the second configuration subframe (antenna switching from antenna port 2 to antenna port 3). Antenna port 3, i.e., Tx#3, is used to transmit SRS at symbol #5 of the second configuration subframe in subband #4, at symbol #6 of the second configuration subframe in subband #2, at symbol #7 of the second configuration subframe in subband #3, and at symbol #8 of the second configuration subframe in subband #1.

[0150] like Figure 14As shown, in the eleventh embodiment, antenna ports 0 and 1 are used to transmit SRS in the first configuration subframe, and antenna ports 2 and 3 are used to transmit SRS in the second configuration subframe. According to the twelfth embodiment, antenna port 0 is used to transmit SRS in the first configuration subframe, and antenna ports 1, 2, and 3 are used to transmit SRS in the second configuration subframe.

[0151] Figure 15 The illustration shows the aperiodic SRS transmission of a UE with 1T4R according to the twelfth embodiment, where Ns-total = 16 and Nst-total = 18 (CS = 2, in the first configuration subframe, Ns = Nst = 4 without a guard period, and in the second configuration subframe, Ns = 12 and Nst = 14, with two guard periods of one symbol each) and R = 1.

[0152] like Figure 15 As shown, antenna port 0, i.e., Tx#0, is used to transmit SRS at symbol #0 of the first configuration subframe in subband #4, at symbol #1 of the first configuration subframe in subband #2, at symbol #2 of the first configuration subframe in subband #3, and at symbol #3 of the first configuration subframe in subband #1. Antenna port 1, i.e., Tx#1, is used to transmit SRS at symbol #0 of the second configuration subframe in subband #4, at symbol #1 of the second configuration subframe in subband #2, at symbol #2 of the second configuration subframe in subband #3, and at symbol #3 of the second configuration subframe in subband #1. A symbol guard period is added at symbol #4 of the second configuration subframe (antenna switching from antenna port 1 to antenna port 2). Antenna port 2, i.e., Tx#2, is used to transmit SRS at symbol #5 of the second configuration subframe in subband #4, at symbol #6 of the second configuration subframe in subband #2, at symbol #7 of the second configuration subframe in subband #3, and at symbol #8 of the second configuration subframe in subband #1. A symbol guard period (antenna switching from antenna port 2 to antenna port 3) is added at symbol #9 of the second configuration subframe. Antenna port 3, i.e., Tx#3, is used to transmit SRS at symbol #10 of the second configuration subframe in subband #4, at symbol #11 of the second configuration subframe in subband #2, at symbol #12 of the second configuration subframe in subband #3, and at symbol #13 of the second configuration subframe in subband #1.

[0153] In the twelfth embodiment, one antenna port is used to transmit SRS in the first configuration subframe, and three antenna ports are used to transmit SRS in the second configuration subframe. Alternatively, three antenna ports may be used to transmit SRS in the first configuration subframe, and one antenna port may be used to transmit SRS in the second configuration subframe.

[0154] According to the thirteenth embodiment, a UE with 1T4R capability can be configured to perform antenna switching and repetition between one or two subframes with or without a guard period (e.g., R = 2, 3, or 4). The number of subbands is calculated by (Ns - Total / R) / (y / x), where y represents the number of antenna ports (or antenna ports that can be used simultaneously for reception), and x represents the number of antenna ports that can be used simultaneously for transmission. According to the thirteenth embodiment, y = 4, x = 1 (i.e., 1T4R). Assuming that each subband has the same bandwidth, the full hopping bandwidth is (Ns - Total / R) / (y / x) times the bandwidth of the subband across the configuration symbol. When (Ns - Total / R) / (y / x) equals 1, each antenna port transmits SRS in the full hopping bandwidth. Each antenna port transmitting SRS is mapped to the same subband within R adjacent symbols (i.e., the full probe band in this embodiment) for repetition. Different antenna ports are mapped to different symbols.

[0155] Figure 16 Figures (a) and (b) illustrate a first example of aperiodic SRS transmission with repetition R=2 according to the thirteenth embodiment, wherein... Figure 16 (a) Indicates no protection period and is configured with Nst-Total = Ns-Total = Nst = Ns = 8, while Figure 16 (b) Indicates a protection period for a symbol and is configured with Nst-Total = Nst = 11 and Ns-Total = Ns = 8.

[0156] like Figure 16 As shown in (a), antenna port 0, i.e. Tx#0, is used to transmit SRS in the full probe band at symbols #0 and #1; antenna port 1, i.e. Tx#1, is used to transmit SRS in the full probe band at symbols #2 and #3; antenna port 2, i.e. Tx#2, is used to transmit SRS in the full probe band at symbols #4 and #5; and antenna port 3, i.e. Tx#3, is used to transmit SRS in the full probe band at symbols #6 and #7.

[0157] like Figure 16As shown in (b), antenna port 0 is used to transmit SRS in the full probe band at symbols #0 and #1. At symbol #2, a guard period is added when the antenna port switches from antenna port 0 to antenna port 1. Antenna port 1 is used to transmit SRS in the full probe band at symbols #3 and #4. At symbol #5, a guard period is added when the antenna port switches from antenna port 1 to antenna port 2. Antenna port 3 is used to transmit SRS in the full probe band at symbols #6 and #7. At symbol #8, a guard period is added when the antenna port switches from antenna port 2 to antenna port 3. Antenna port 3 is used to transmit SRS in the full probe band at symbols #9 and #10. Figure 16 As shown in (b), a total of eleven symbols (Nst-Total = Nst = 11) are configured for use by the SRS, of which eight symbols (Ns-Total = Ns = 8) are used for the actual transmission of the SRS, while the remaining three symbols (e.g., symbol #2, symbol #5 and symbol #8) are used for the protection period.

[0158] Figure 17 Figures (a) and (b) illustrate a second example of aperiodic SRS transmission with repetition R=3 according to the thirteenth embodiment, wherein... Figure 17 (a) Indicates no protection period and is configured with Nst-Total = Ns-Total = Nst = Ns = 12, while Figure 17 (b) Indicates a protection period for a symbol and is configured with Nst-Total=14 and Ns-Total=12 (CS=2, Nst=7 and Ns=6 in the first configuration subframe, and Nst=7 and Ns=6 in the second configuration subframe).

[0159] like Figure 17 As shown in (a), antenna port 0, i.e. Tx#0, is used to transmit SRS in the full probe band at symbols #0, #1 and #2; antenna port 1, i.e. Tx#1, is used to transmit SRS in the full probe band at symbols #3, #4 and #5; antenna port 2, i.e. Tx#2, is used to transmit SRS in the full probe band at symbols #6, #7 and #8; and antenna port 3, i.e. Tx#3, is used to transmit SRS in the full probe band at symbols #9, #10 and #11.

[0160] like Figure 17As shown in (b), antenna port 0 is used to transmit SRS in the full detection band at symbols #0, #1, and #2 of the first configuration subframe (i.e., subframe #n). At symbol #3 of the first configuration subframe, when the antenna port switches from antenna port 0 to antenna port 1, a guard period is added, and antenna port 1 is used to transmit SRS in the full detection band at symbols #4, #5, and #6 of the first configuration subframe. Antenna port 2 is used to transmit SRS in the full detection band at symbols #0, #1, and #2 of the second configuration subframe (i.e., subframe #n+K). At symbol #3 of the second configuration subframe, when the antenna port switches from antenna port 2 to antenna port 3, a guard period is added, and antenna port 3 is used to transmit SRS in the full detection band at symbols #4, #5, and #6 of the second configuration subframe. Figure 17 As shown in (b), a total of fourteen symbols (Nst-Total=14) are configured for use by the SRS, of which twelve symbols (Ns-Total=12) are used for the actual transmission of the SRS, while the remaining two symbols (e.g., symbol #3 of the first configuration subframe and symbol #3 of the second configuration subframe) are used for the protection period.

[0161] Figure 18 The figure illustrates a third example of aperiodic SRS transmission with repeating R=4 and no guard period according to the thirteenth embodiment, where Nst-Total=Ns-Total=16 (in both the first configuration subframe and the second configuration subframe, CS=2, Nst=Ns=8).

[0162] like Figure 18 As shown, antenna port 0, i.e., Tx#0, is used to transmit SRS in the full probe band at symbols #0, #1, #2 and #3 in the first configuration subframe (i.e., subframe #n); antenna port 1, i.e., Tx#1, is used to transmit SRS in the full probe band at symbols #4, #5, #6 and #7 in the first configuration subframe; antenna port 2, i.e., Tx#2, is used to transmit SRS in the full probe band at symbols #0, #1, #2 and #3 in the second configuration subframe (i.e., subframe #n+K); antenna port 3, i.e., Tx#3, is used to transmit SRS in the full probe band at symbols #4, #5, #6 and #7 in the second configuration subframe.

[0163] Figure 19 The illustration shows a fourth example of a non-periodic SRS transmission with repeating R=4 and no guard period according to the thirteenth embodiment, where Nst-Total=Ns-Total=16 (CS=2, Nst=Ns=4 in the first configuration subframe, and Nst=Ns=12 in the second configuration subframe).

[0164] like Figure 19 As shown, antenna port 0, i.e., Tx#0, is used to transmit SRS in the full probe band at symbols #0, #1, #2 and #3 in the first configuration subframe (i.e., subframe #n); antenna port 1, i.e., Tx#1, is used to transmit SRS in the full probe band at symbols #0, #1, #2 and #3 in the second configuration subframe (i.e., subframe #n+K); antenna port 2, i.e., Tx#2, is used to transmit SRS in the full probe band at symbols #4, #5, #6 and #7 in the second configuration subframe; and antenna port 3, i.e., Tx#3, is used to transmit SRS in the full probe band at symbols #8, #9, #10 and #11 in the second configuration subframe.

[0165] In the fourth example of the thirteenth embodiment, one antenna port is used to transmit SRS in the first configuration subframe, while three antenna ports are used to transmit SRS in the second configuration subframe. Alternatively, three antenna ports may be used to transmit SRS in the first configuration subframe, and one antenna port may be used to transmit SRS in the second configuration subframe.

[0166] Figure 20 The illustration shows a fifth example of a non-periodic SRS transmission with repetition R=4 and a guard period according to the thirteenth embodiment, where Nst-Total=18 and Ns-Total=16 (in both the first configuration subframe and the second configuration subframe, CS=2, Nst=9 and Ns=8).

[0167] like Figure 20 As shown, antenna port 0, i.e., Tx#0, is used to transmit SRS in the full detection band at symbols #0, #1, #2, and #3 of the first configuration subframe (i.e., subframe #n). At symbol #4 of the first configuration subframe, a guard period for one symbol is added when the antenna port switches from antenna port 0 to antenna port 1. Antenna port 1, i.e., Tx#1, is used to transmit SRS in the full detection band at symbols #5, #6, #7, and #8 of the first configuration subframe. Antenna port 2, i.e., Tx#2, is used to transmit SRS in the full detection band at symbols #0, #1, #2, and #3 of the second configuration subframe (i.e., subframe #n+K). At symbol #4 of the second configuration subframe, a guard period for one symbol is added when the antenna port switches from antenna port 2 to antenna port 3. Antenna port 3, i.e., Tx#3, is used to transmit SRS in the full detection band at symbols #5, #6, #7, and #8 of the second configuration subframe. For example... Figure 20As shown, a total of eighteen symbols (Nst-Total=18) are configured for use by the SRS, of which sixteen symbols (Ns-Total=16) are used for the actual transmission of the SRS, while the remaining two symbols (e.g., symbol #4 of the first configuration subframe and symbol #4 of the second configuration subframe) are used for the protection period.

[0168] Figure 21 This is a sixth example of a non-periodic SRS transmission with repeating R=4 and having a guard period according to the thirteenth embodiment, wherein Nst=18 and Ns=16 (CS=2, Nst=Ns=4 in the first configuration subframe, and Nst=14 and Ns=12 in the second configuration subframe having two guard periods of one symbol).

[0169] like Figure 21 As shown, antenna port 0, i.e., Tx#0, is used to transmit SRS in the full detection band at symbols #0, #1, #2, and #3 of the first configuration subframe (i.e., subframe #n). Antenna port 1, i.e., Tx#1, is used to transmit SRS in the full detection band at symbols #0, #1, #2, and #3 of the second configuration subframe (i.e., subframe #n+K). At symbol #4 of the second configuration subframe, a guard period is added when the antenna port switches from antenna port 1 to antenna port 2. Antenna port 2, i.e., Tx#2, is used to transmit SRS in the full detection band at symbols #5, #6, #7, and #8 of the second configuration subframe. At symbol #9 of the second configuration subframe, a guard period is added when the antenna port switches from antenna port 2 to antenna port 3. Antenna port 3, i.e., Tx#3, is used to transmit SRS in full band at symbols #10, #11, #12, and #13 of the second configuration subframe. For example... Figure 21 As shown, a total of eighteen symbols (Nst-Total=18) are configured for SRS, of which sixteen symbols (Ns-Total=16) are used for the actual transmission of SRS, while the remaining two symbols (e.g., symbol #4 of the second configuration subframe and symbol #8 of the second configuration subframe) are used for the protection period.

[0170] In the sixth example of the thirteenth embodiment, one antenna port is used to transmit SRS in the first configuration subframe, and three antenna ports are used to transmit SRS in the second configuration subframe. Alternatively, three antenna ports may be used to transmit SRS in the first configuration subframe, and one antenna port may be used to transmit SRS in the second configuration subframe.

[0171] Figure 22 This is a schematic block diagram illustrating an apparatus according to one embodiment.

[0172] refer to Figure 22 The UE includes a processor, memory, and transceiver. The processor is implemented in the above... Figures 1 to 21 The functions, processes, and / or methods proposed in [the document]. A gNB (i.e., a base station) includes a processor, memory, and transceiver. The processor is implemented in [the above]. Figures 1 to 21 The functions, processes, and / or methods proposed in the document. Each layer of the radio interface protocol can be implemented by a processor. A memory is connected to the processor to store information used to drive the processor. A transceiver is connected to the processor to transmit and / or receive radio signals. Needless to say, a transceiver can be implemented as a transmitter that transmits radio signals and a receiver that receives radio signals.

[0173] The memory can be located inside or outside the processor and connected to the processor via various known devices. Additionally, relay nodes can have a single antenna or multiple antennas.

[0174] In the above embodiments, components and features of the embodiments are combined in a predetermined form. Unless otherwise expressly stated, each component or feature should be considered optional. Each component or feature may be implemented without being associated with other components or features. Additionally, embodiments may be configured by associating some components and / or features. The order of operations described in the embodiments may be changed. Some components or features of any embodiment may be included in another embodiment or replaced with components and features corresponding to another embodiment. Clearly, claims not expressly stated in the claims are combined to form embodiments or included in new claims.

[0175] The embodiments can be implemented by hardware, firmware, software, or a combination thereof. In the case of hardware implementation, the exemplary embodiments described herein can be implemented using one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc., according to the hardware implementation.

[0176] The embodiments may be practiced in other specific forms. The described embodiments are to be considered in all respects as illustrative only and not restrictive. Therefore, the scope of the invention is indicated by the appended claims, and not by the foregoing description. All variations within the equivalent meaning and scope of the claims are to be included within their scope.

Claims

1. A method at a base station unit, comprising: Configure one or more sets of higher-layer parameters for SRS transmissions with at least one of frequency hopping, repetition, and antenna switching; as well as Send a DCI containing a non-zero SRS request field or send higher-layer signaling to trigger SRS transmission in symbols within one or more normal subframes. Wherein, one of the parameter sets for an aperiodic SRS transmission comprises 2-hop intra-subframe frequency hopping, and where Ns = 4 and R = 2, or Ns = 6 and R = 3, or Ns = 8 and R = 4, each hop has the same bandwidth and each of the antenna ports used to transmit SRS is mapped to the same set of subcarriers, where Ns is the number of SRS symbols configured for transmitting SRS and R is the repetition factor, and Where no protection period is configured, the start symbol of the SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10} corresponding to Ns=4, or as one of {0, 1, 2, 3, 4, 5, 6, 7, 8} corresponding to Ns=6, or as one of {0, 1, 2, 3, 4, 5, 6} corresponding to Ns=8.

2. The method according to claim 1, wherein, Under the condition of configuring a protection period of one symbol for frequency hopping, the start symbol of the SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} corresponding to Ns=4, or as one of {0, 1, 2, 3, 4, 5, 6, 7} corresponding to Ns=6, or as one of {0, 1, 2, 3, 4, 5} corresponding to Ns=8.

3. The method according to claim 1, wherein, One of the parameters in the parameter set for a periodic SRS with intra- and inter-subframe frequency hopping includes Ns = 2 or 4 symbols in a subframe, and for all antenna ports, the SRS occupies one or more of the same symbol positions in each subframe, where Ns is the number of SRS symbols configured to transmit the SRS in a subframe.

4. The method according to claim 3, wherein, When frequency hopping is configured and Ns = 4 in a subframe and the repetition factor R = 2 or 4, each of the antenna ports across each subframe is mapped to a different set of subcarriers, and each of the antenna ports within each repetition of the adjacent symbols in each subframe is mapped to the same set of subcarriers.

5. The method according to claim 3, wherein, When Ns = R = 2 or 4 and frequency hopping is configured, each of the antenna ports is mapped to the same set of subcarriers within each repetition of adjacent symbols in each subframe.

6. The method according to claim 3, wherein, Without configuring a protection period, the start symbol of the SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12} corresponding to Ns=2, or as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10} corresponding to Ns=4.

7. The method according to claim 3, wherein, Under the condition of configuring a protection period of one symbol for frequency hopping, the start symbol of the SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11} corresponding to Ns=2, or as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} corresponding to Ns=4.

8. The method according to claim 1, wherein, An aperiodic SRS transmission in the parameter set for antenna switching of a UE with 1T4R capability without a guard period includes: Nst-total = 8 symbols in one subframe with 2-hop intra-subframe frequency hopping, or Nst-total = 16 symbols in two subframes with 4-hop intra-subframe frequency hopping, where Nst-total is the number of adjacent SRS symbols configured for SRS.

9. The method according to claim 1, wherein, An aperiodic SRS transmission in the parameter set for antenna switching of a UE with 1T4R capability and a guard period for intra-subframe antenna switching includes: Nst-total = 11 symbols in one subframe with 2-hop intra-subframe frequency hopping, or Nst-total = 18 symbols in two subframes with 4-hop intra-subframe frequency hopping, where Nst-total is the number of adjacent SRS symbols configured for SRS.

10. The method according to claim 1, wherein, An aperiodic SRS transmission for antenna handover of a UE with 1T4R capability without a guard period in the parameter set includes: Nst-total = 8 in one subframe with a repetition factor R = 2, or Nst-total = 12 in one subframe with a repetition factor R = 3, or Nst-total = 16 in two subframes with a repetition factor R = 4, where Nst-total is the number of adjacent SRS symbols configured for SRS.

11. The method according to claim 1, wherein, An aperiodic SRS transmission in the parameter set for antenna handover of a UE with 1T4R capability and a guard period for intra-subframe antenna handover includes: Nst-total = 11 in one subframe with a repetition factor R = 2, or Nst-total = 14 in one subframe with a repetition factor R = 3, or Nst-total = 18 in two subframes with a repetition factor R = 4, where Nst-total is the number of adjacent SRS symbols configured for SRS.

12. The method according to claim 1, wherein, Send a DCI with a non-zero SRS request field to trigger an aperiodic SRS transmission across at least two normal subframes.

13. The method according to claim 8 or 9, wherein, The full probe bandwidth of each antenna port is twice the bandwidth of a subband spanning two adjacent symbols in a subframe, and each of the antenna ports in the subframe is mapped to the two adjacent symbols; or the full probe bandwidth of each antenna port is four times the bandwidth of a subband spanning four adjacent symbols in a subframe, and each of the antenna ports in the subframe is mapped to the four adjacent symbols, and different antenna ports are mapped to different symbols.

14. The method according to claim 10 or 11, wherein, In all R adjacent symbols, each of the antenna ports is mapped to the same set of subcarriers, and different antennas are mapped to different symbols.

15. The method according to claim 8 or 9, wherein, When an aperiodic SRS transmission spanning two normal subframes has Nst-total = 16 or 18 symbols and 4-hop frequency hopping and antenna switching, two antenna ports are transmitted in each subframe, or one antenna port is transmitted in one subframe and another three antenna ports are transmitted in the other subframe.

16. The method according to claim 10 or 11, wherein, When an aperiodic SRS transmission spanning two normal subframes has Nst-total = 16 or 18 symbols and has a repetition factor R = 4 and antenna switching, two antenna ports are transmitted in each subframe, or one antenna port is transmitted in one subframe and another three antenna ports are transmitted in the other subframe.

17. The method according to any one of claims 9 to 12, wherein, The aperiodic SRS, triggered by a DCI, is transmitted in both the supplementary SRS symbol and the conventional SRS symbol.

18. A method at a remote unit, comprising: Receive one or more sets of higher-layer parameters for SRS transmissions having at least one of frequency hopping, repetition, and antenna switching. Receive DCI containing a non-zero SRS request field or receive higher-layer signaling to trigger SRS transmission in symbols within one or more normal subframes; and SRS is transmitted in the triggered symbols of one or more normal subframes. in, One of the parameter sets for an aperiodic SRS transmission comprises 2-hop intra-subframe frequency hopping, where Ns = 4 and R = 2, or Ns = 6 and R = 3, or Ns = 8 and R = 4, each hop having the same bandwidth and each of the antenna ports used to transmit the SRS being mapped to the same set of subcarriers, where Ns is the number of SRS symbols configured for transmitting the SRS and R is the repetition factor. Where no protection period is configured, the start symbol of the SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10} corresponding to Ns=4, or as one of {0, 1, 2, 3, 4, 5, 6, 7, 8} corresponding to Ns=6, or as one of {0, 1, 2, 3, 4, 5, 6} corresponding to Ns=8.

19. The method according to claim 18, wherein, Sending the SRS includes: utilizing at least a number of configured SRS symbols. and A defined pattern is used to perform group transitions or sequence transitions.

20. The method according to claim 19, wherein, If the group transition is enabled and the sequence transition is disabled, then the mode is utilized. Execute the group transition; and if the group transition is disabled and the sequence transition is enabled, utilize the pattern. Perform the sequence transition.

21. The method of claim 20, further comprising: For the 2ms SRS periodicity of the TDD system, according to Count the number of UE-specific SRS transmissions, and / or for periodic SRS, according to Count the number of UE-specific SRS transmissions.

22. A base station unit, comprising: A processor configured with one or more higher-layer parameter sets for SRS transmission having at least one of frequency hopping, repetition, and antenna switching; as well as The transceiver transmits a DCI containing a non-zero SRS request field or transmits higher-layer signaling to trigger SRS transmission in symbols within one or more normal subframes. Wherein, one of the parameter sets for an aperiodic SRS transmission comprises 2-hop intra-subframe frequency hopping, and where Ns = 4 and R = 2, or Ns = 6 and R = 3, or Ns = 8 and R = 4, each hop has the same bandwidth and each of the antenna ports used to transmit SRS is mapped to the same set of subcarriers, where Ns is the number of SRS symbols configured for transmitting SRS and R is the repetition factor, and Where no protection period is configured, the start symbol of the SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10} corresponding to Ns=4, or as one of {0, 1, 2, 3, 4, 5, 6, 7, 8} corresponding to Ns=6, or as one of {0, 1, 2, 3, 4, 5, 6} corresponding to Ns=8.

23. The base station unit according to claim 22, wherein, Under the condition of configuring a protection period of one symbol for frequency hopping, the start symbol of the SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} corresponding to Ns=4, or as one of {0, 1, 2, 3, 4, 5, 6, 7} corresponding to Ns=6, or as one of {0, 1, 2, 3, 4, 5} corresponding to Ns=8.

24. The base station unit according to claim 22, wherein, One of the parameters in the parameter set for a periodic SRS with intra- and inter-subframe frequency hopping includes Ns = 2 or 4 symbols in a subframe, and for all antenna ports, the SRS occupies one or more of the same symbol positions in each subframe, where Ns is the number of SRS symbols configured to transmit the SRS in a subframe.

25. The base station unit according to claim 24, wherein, When frequency hopping is configured and Ns = 4 in a subframe and the repetition factor R = 2 or 4, each of the antenna ports across each subframe is mapped to a different set of subcarriers, and each of the antenna ports within each repetition of the adjacent symbols in each subframe is mapped to the same set of subcarriers.

26. The base station unit according to claim 24, wherein, When Ns = R = 2 or 4 and frequency hopping is configured, each of the antenna ports is mapped to the same set of subcarriers within each repetition of adjacent symbols in each subframe.

27. The base station unit according to claim 24, wherein, Without configuring a protection period, the start symbol of the SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12} corresponding to Ns=2, or as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10} corresponding to Ns=4.

28. The base station unit according to claim 24, wherein, Under the condition of configuring a protection period of one symbol for frequency hopping, the start symbol of the SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11} corresponding to Ns=2, or as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} corresponding to Ns=4.

29. The base station unit according to claim 22, wherein, An aperiodic SRS transmission in the parameter set for antenna switching of a UE with 1T4R capability without a guard period includes: Nst-total = 8 symbols in one subframe with 2-hop intra-subframe frequency hopping, or Nst-total = 16 symbols in two subframes with 4-hop intra-subframe frequency hopping, where Nst-total is the number of adjacent SRS symbols configured for SRS.

30. The base station unit according to claim 22, wherein, An aperiodic SRS transmission in the parameter set for antenna switching of a UE with 1T4R capability and a guard period for intra-subframe antenna switching includes: Nst-total = 11 symbols in one subframe with 2-hop intra-subframe frequency hopping, or Nst-total = 18 symbols in two subframes with 4-hop intra-subframe frequency hopping, where Nst-total is the number of adjacent SRS symbols configured for SRS.

31. The base station unit according to claim 22, wherein, An aperiodic SRS transmission for antenna handover of a UE with 1T4R capability without a guard period in the parameter set includes: Nst-total = 8 in one subframe with a repetition factor R = 2, or Nst-total = 12 in one subframe with a repetition factor R = 3, or Nst-total = 16 in two subframes with a repetition factor R = 4, where Nst-total is the number of adjacent SRS symbols configured for SRS.

32. The base station unit according to claim 22, wherein, An aperiodic SRS transmission in the parameter set for antenna handover of a UE with 1T4R capability and a guard period for intra-subframe antenna handover includes: Nst-total = 11 in one subframe with a repetition factor R = 2, or Nst-total = 14 in one subframe with a repetition factor R = 3, or Nst-total = 18 in two subframes with a repetition factor R = 4, where Nst-total is the number of adjacent SRS symbols configured for SRS.

33. The base station unit according to claim 22, wherein, Send a DCI with a non-zero SRS request field to trigger an aperiodic SRS transmission across at least two normal subframes.

34. The base station unit according to claim 29 or 30, wherein, The full probe bandwidth of each antenna port is twice the bandwidth of a subband spanning two adjacent symbols in a subframe, and each of the antenna ports in the subframe is mapped to the two adjacent symbols; or the full probe bandwidth of each antenna port is four times the bandwidth of a subband spanning four adjacent symbols in a subframe, and each of the antenna ports in the subframe is mapped to the four adjacent symbols, and different antenna ports are mapped to different symbols.

35. The base station unit according to claim 31 or 32, wherein, In all R adjacent symbols, each of the antenna ports is mapped to the same set of subcarriers, and different antennas are mapped to different symbols.

36. The base station unit according to claim 29 or 30, wherein, When an aperiodic SRS transmission spanning two normal subframes has Nst-total = 16 or 18 symbols and 4-hop frequency hopping and antenna switching, two antenna ports are transmitted in each subframe, or one antenna port is transmitted in one subframe and another three antenna ports are transmitted in the other subframe.

37. The base station unit according to claim 31 or 32, wherein, When an aperiodic SRS transmission spanning two normal subframes has Nst-total = 16 or 18 symbols and has a repetition factor R = 4 and antenna switching, two antenna ports are transmitted in each subframe, or one antenna port is transmitted in one subframe and another three antenna ports are transmitted in the other subframe.

38. The base station unit according to any one of claims 30 to 33, wherein, The aperiodic SRS, triggered by a DCI, is transmitted in both the supplementary SRS symbol and the conventional SRS symbol.

39. A remote unit, comprising A receiver that receives one or more sets of higher-layer parameters for an SRS transmission having at least one of frequency hopping, repetition, and antenna switching, and receives DCI or receive higher-layer signaling containing a non-zero SRS request field to trigger an SRS transmission in symbols within one or more normal subframes; and The transmitter transmits SRS in one or more triggered symbols within a normal subframe. in, One of the parameter sets for an aperiodic SRS transmission comprises 2-hop intra-subframe frequency hopping, where Ns = 4 and R = 2, or Ns = 6 and R = 3, or Ns = 8 and R = 4, each hop having the same bandwidth and each of the antenna ports used to transmit the SRS being mapped to the same set of subcarriers, where Ns is the number of SRS symbols configured for transmitting the SRS and R is the repetition factor. Where no protection period is configured, the start symbol of the SRS transmission is configured as one of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10} corresponding to Ns=4, or as one of {0, 1, 2, 3, 4, 5, 6, 7, 8} corresponding to Ns=6, or as one of {0, 1, 2, 3, 4, 5, 6} corresponding to Ns=8.

40. The remote unit according to claim 39, wherein, The transmitter utilizes at least based on the number of configured SRS symbols. and A defined pattern is used to perform group transitions or sequence transitions.

41. The remote unit according to claim 40, wherein, If the group transition is enabled and the sequence transition is disabled, then the mode is utilized. Execute the group transition; and if the group transition is disabled and the sequence transition is enabled, utilize the pattern. Perform the sequence transition.

42. The remote unit according to claim 41, further comprising a processor, the processor being configured to respond to the 2ms SRS periodicity of the TDD system according to... Count the number of UE-specific SRS transmissions, and / or for periodic SRS, according to Count the number of UE-specific SRS transmissions.

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