Speed-based transmission scheme switching method, communication system, and test and / or measurement system

Abstract

This invention discloses a speed-based transmission scheme switching method, a communication system, and a test and / or measurement system. A speed-based transmission scheme switching method for switching transmission schemes between a transmitter node (12) and a receiver node (14) is described. The speed-based transmission scheme switching method includes the steps of: determining at least one speed parameter, wherein the at least one speed parameter includes the speed of the transmitter node (12), the speed of the receiver node (14), and / or the relative speed between the transmitter node (12) and the receiver node (14); and switching between a first transmission scheme associated with a lower range of the at least one speed parameter and a second transmission scheme associated with a higher range of the at least one speed parameter based on the determined at least one speed parameter. Furthermore, a communication system (10) and a test and / or measurement system are described.

Description

Technical Field

[0001] This invention generally relates to a speed-based transmission scheme switching method. The invention further relates to a communication system, and a test and / or measurement system. Background Technology

[0002] Wireless communication is based on the modulation of radio frequency (RF) signals according to a predetermined modulation scheme, which is used by both the transmitter node and the receiver node.

[0003] Typically, the modulation applied needs to ensure that the data contained in the modulated RF signal is correctly transmitted from the transmitter node to the receiver node, while being as insensitive to distortion as possible to ensure a low symbol error rate.

[0004] For example, such distortion may be caused by the Doppler effect resulting from the relative motion between the transmitter and receiver nodes.

[0005] Therefore, the object of the present invention is to provide a method, a communication system, and a test and / or measurement system that provides enhanced robustness against distortion caused by the Doppler effect. Summary of the Invention

[0006] According to the present invention, this problem is solved by a speed-based transmission scheme switching method for switching transmission schemes between transmitter nodes and receiver nodes. The speed-based transmission scheme switching method includes the following steps:

[0007] - Determine at least one velocity parameter, wherein the at least one velocity parameter includes the velocity of the transmitter node, the velocity of the receiver node, and / or the relative velocity between the transmitter node and the receiver node; and

[0008] - Based on at least one determined speed parameter, switching is performed between a first transmission scheme associated with a lower range of at least one speed parameter and a second transmission scheme associated with a higher range of at least one speed parameter.

[0009] In this context and below, the term "node" is understood to mean an electronic circuit, electronic device, or multiple interoperable electronic devices configured to communicate with other nodes via wireless RF signals. More precisely, each node may be configured to generate, transmit, and / or receive modulated RF signals comprising a sequence of symbols modulated onto an RF signal using a modulation technique.

[0010] The term "transmission scheme" is understood to refer to a series of signal modifications applied to an RF signal in order to modulate a symbol sequence onto the RF signal and / or recover a symbol sequence from a modulated RF signal. Therefore, a transmission scheme includes a modulation scheme applied to an RF signal. Furthermore, a transmission scheme may include a data encoding scheme.

[0011] The speed-based transmission scheme switching method according to the present invention is based on the concept that, based on the speed of the transmitter node, the speed of the receiver node, and / or the relative speed between the transmitter node and the receiver node, the switching between different transmission schemes is performed dynamically.

[0012] Different transmission schemes typically offer different performance at different relative speeds between the transmitter and receiver nodes; that is, one transmission scheme may perform better at lower relative speeds, while another may perform better at higher relative speeds.

[0013] According to the present invention, a better-performing transmission scheme is dynamically selected for communication between the transmitter node and the receiver node based on at least one determined speed parameter.

[0014] Therefore, by utilizing the speed-based transmission scheme switching method according to the present invention, optimal communication performance is ensured for all ranges of relative speeds between the transmitter node and the receiver node.

[0015] According to an aspect of the invention, if at least one determined speed parameter is greater than a first speed threshold, a switch from a first transmission scheme to a second transmission scheme is performed. More precisely, a switch from a first transmission scheme to a second transmission scheme can be performed if at least one determined speed parameter increases from a region below the first speed threshold to a region above the first speed threshold.

[0016] In this context, the first speed threshold can be located in the speed range where the second transmission scheme is superior to the first transmission scheme.

[0017] The first speed threshold can be selected based on a comparison of the performance of the transmitter node and / or receiver node at different speeds using the first transmission scheme and the second transmission scheme.

[0018] In an exemplary embodiment of the present invention, if at least one determined speed parameter is less than a second speed threshold, a switch from the second transmission scheme to the first transmission scheme is performed. More precisely, a switch from the second transmission scheme to the first transmission scheme can be performed if at least one determined speed parameter decreases from a region above the second speed threshold to a region below the second speed threshold.

[0019] In this context, the second speed threshold can be located in the speed range where the first transmission scheme is superior to the second transmission scheme.

[0020] The second speed threshold can be selected based on a comparison of the performance of the transmitter node and / or receiver node at different speeds using the first and second transmission schemes.

[0021] In this invention, a first speed threshold is specified to be greater than a second speed threshold. This ensures that switching from a first transmission scheme to a second transmission scheme, or vice versa, is only performed if there is a tangible performance improvement after switching transmission schemes.

[0022] Furthermore, the distinct speed thresholds ensure that the transmission scheme is not repeatedly switched if at least one speed parameter has a value near the first or second speed threshold and varies slightly.

[0023] However, it should be noted that the first speed threshold and the second speed threshold can, in principle, be chosen to be equal.

[0024] In another embodiment of the invention, the first transmission scheme is an orthogonal frequency division multiplexing (OFDM) scheme. OFDM schemes offer particularly high performance at lower relative speeds between the transmitter and receiver nodes, especially below a second speed threshold.

[0025] For example, the first transmission scheme could be a cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) scheme or a discrete Fourier transform-extended orthogonal frequency division multiplexing (DFT-S-OFDM) scheme.

[0026] According to another aspect of the invention, the second transmission scheme is an orthogonal time-frequency space (OTFS) scheme or an orthogonal time-frequency multiplexing (OTFM) scheme. The OTFS and OTFM schemes provide particularly high performance at higher relative speeds between the transmitter and receiver nodes, especially above a first speed threshold.

[0027] One aspect of the present invention specifies the use of a complete modulation and coding scheme (MCS) table in a first transmission scheme.

[0028] Typically, the MCS table reflects the parameters of the wireless connection between the transmitter node and the receiver node.

[0029] More precisely, the MCS table includes various combinations of modulation and coding schemes, along with associated parameters. For example, the MCS table includes modulation order, target code rate, and / or spectral efficiency.

[0030] Based on the MCS table, transmitter nodes and receiver nodes can select a combination of modulation and coding schemes.

[0031] In the first transmission scheme, there may be no restrictions, allowing the complete MCS table to be utilized by both the transmitter and receiver nodes.

[0032] In an exemplary embodiment of the invention, an adjusted modulation and coding scheme (MCS) table is utilized in the second transmission scheme. In other words, different MCS tables can be provided for the second transmission scheme. In this way, it is ensured that only appropriate combinations of modulation and coding schemes can be selected by the transmitter node and receiver node when employing the second transmission scheme.

[0033] The adjusted MCS table can be a simplified version of the full MCS table, or a separate MCS table with different properties compared to the full MCS table. It has been demonstrated that the performance of the transmitter node and / or receiver node can be enhanced when using the second transmission scheme if a simplified MCS table or a separate MCS table with a reduced number of modulation and coding schemes is used in the second transmission scheme.

[0034] For example, an adjusted MCS table can have a lower modulation order, a lower coding rate, and / or finer granularity relative to factors such as coding rate, error correction rate, and transport block size. It has been demonstrated that the performance of transmitter and / or receiver nodes can be significantly enhanced by utilizing such an adjusted MCS table.

[0035] In another embodiment of the invention, the second transmission scheme utilizes only contiguous resource allocation in the frequency domain. In other words, all subsequent subcarriers in the frequency domain are used for the second transmission scheme. It has been demonstrated that the performance of the transmitter node and / or receiver node in the second transmission scheme can be significantly enhanced when contiguous resource allocation in the frequency domain is applied.

[0036] Therefore, no empty subcarriers can be inserted between the subcarriers allocated to the second transmission scheme.

[0037] Similarly, there may be no subcarriers assigned to different transmission schemes between the two subcarriers assigned to the second transmission scheme, and in particular, there may be no subcarriers assigned to the first transmission scheme.

[0038] According to one aspect of the invention, both the transmitter node and the receiver node automatically switch between a first transmission scheme and a second transmission scheme based on at least one determined speed parameter.

[0039] In this process, at least one velocity parameter can be determined by the receiver node and / or the transmitter node.

[0040] If at least one velocity parameter is determined solely by the receiver node, then at least one velocity parameter can be transmitted from the receiver node to the transmitter node.

[0041] If at least one velocity parameter is determined solely by the transmitter node, then at least one velocity parameter can be transmitted from the transmitter node to the receiver node.

[0042] In another embodiment of the invention, the transmitter node initiates a switch between a first transmission scheme and a second transmission scheme. Therefore, the transmitter node decides whether to switch transmission schemes.

[0043] The transmitter node can send a scheme switching instruction message to the receiver node, and the receiver node can switch between the first transmission scheme and the second transmission scheme based on the scheme switching instruction message.

[0044] In this process, the transmitter node can determine at least one velocity parameter.

[0045] However, it is also conceivable that the receiver node can determine at least one velocity parameter and transmit the determined velocity parameter to the transmitter node.

[0046] In another exemplary embodiment of the present invention, the receiver node initiates a switch between a first transmission scheme and a second transmission scheme. Therefore, the receiver node decides whether to switch transmission schemes.

[0047] The receiver node can transmit a scheme switching instruction message to the transmitter node, and the transmitter node can switch between the first transmission scheme and the second transmission scheme based on the scheme switching instruction message.

[0048] In this process, the receiver node can determine at least one velocity parameter.

[0049] However, it is also conceivable that the transmitter node can determine at least one velocity parameter and can transmit the determined velocity parameter to the receiver node.

[0050] According to the present invention, this problem is further solved by a communication system. The communication system includes a transmitter node and a receiver node, wherein the communication system is configured to perform a speed-based transmission scheme switching method according to any of the variations described above.

[0051] Regarding the advantages and further properties of communication systems, refer to the explanations given above regarding the switching methods for speed-based transmission schemes; these explanations also apply to communication systems, and vice versa.

[0052] According to the present invention, this problem is further addressed by a test and / or measurement system. The test and / or measurement system includes a simulation module and an analysis module. The simulation module is configured to simulate a transmitter node or a receiver node to perform tests and / or measurements on the device under test. The simulation module is configured to perform a speed-based transmission scheme switching method according to any of the variations described above in conjunction with the device under test. The analysis module is configured to determine at least one performance parameter of the device under test, wherein the at least one performance parameter is associated with the switching of the device under test between a first transmission scheme and a second transmission scheme.

[0053] In this context and below, the term "module" is understood to describe suitable hardware, suitable software, or a combination of hardware and software configured to perform certain functions.

[0054] Hardware can include, in particular, CPUs, GPUs, FPGAs, ASICs, or other types of electronic circuit systems.

[0055] For example, at least one performance parameter may include bit error rate, symbol error rate, signal-to-noise ratio, switching time spent by the device under test switching transmission schemes, and / or parameters indicating whether the switching between transmission schemes has been correctly performed by the device under test. Attached Figure Description

[0056] When viewed in conjunction with the accompanying drawings, the foregoing aspects and the many incidental advantages of the claimed subject matter will become more readily apparent and better understood, in which the drawings,

[0057] - Figure 1 A communication system according to the present invention is illustrated schematically;

[0058] - Figure 2 A more detailed schematic illustration is shown. Figure 1 Part of the communication system;

[0059] - Figure 3 A flowchart of a speed-based transmission scheme switching method according to the present invention is shown;

[0060] - Figure 4 The velocity parameters are shown relative to the description. Figure 3 A time-based diagram illustrating the method steps;

[0061] - Figure 5 The graph shows the bit error rate versus signal-to-noise ratio for various transmission schemes under different Doppler-induced frequency shifts;

[0062] - Figure 6 The graph shows the bit error rate versus signal-to-noise ratio for various transmission schemes at different modulation orders;

[0063] - Figure 7 An exemplary modulation and coding scheme table is shown;

[0064] - Figure 8 The diagram shows plots of bit error rate versus signal-to-noise ratio for transmission schemes with different resource allocation schemes; and

[0065] - Figure 9 A test and / or measurement system according to the present invention is illustrated schematically. Detailed Implementation

[0066] The detailed description set forth below with reference to the accompanying drawings is intended as a description of various embodiments of the disclosed subject matter and not as representation of only embodiments, wherein the same numerals refer to the same elements. Each embodiment described herein is provided merely as an example or illustration and should not be construed as superior to or beneficial to other embodiments. The illustrative examples provided herein are not intended to be exhaustive or to limit the claimed subject matter to the precise forms disclosed.

[0067] For the purposes of this disclosure, the phrase "at least one of A, B, and C" means, for example, (A), (B), (C), (A and B), (A and C), (B and C), or (A, B, and C), including all further possible permutations when more than three elements are listed. In other words, the term "at least one of A and B" generally means "A and / or B," i.e., "A" alone, "B" alone, or "A and B."

[0068] Figure 1 A communication system 10 including transmitter node 12 and receiver node 14 is schematically shown.

[0069] Typically, transmitter node 12 and receiver node 14 are configured to communicate with each other via wireless RF signals based on a specific wireless communication standard (such as WLAN, 4G or 5G).

[0070] More precisely, transmitter node 12 includes a communication module 16 that can be configured to generate and transmit modulated RF signals, the modulated RF signals comprising a sequence of symbols modulated onto an RF signal using a modulation technique.

[0071] The modulated RF signal is transmitted through transmission path 18 with a specific transmission function H.

[0072] Receiver node 14 includes a communication module 20 configured to receive and demodulate modulated RF signals received via transmission path 18.

[0073] It should be noted that transmitter node 12 and / or receiver node 14 can be established as transceivers, that is, transmitter node 12 and / or receiver node 14 can be configured to transmit and receive modulated RF signals.

[0074] For example, transmitter node 12 can be a user equipment (UE) device, such as a smartphone, tablet, handheld radio, or any other type of UE device configured for wireless communication.

[0075] As another example, receiver node 14 can be a base station.

[0076] However, it is also conceivable that receiver node 14 can be a UE device and / or transmitter node 12 can be a base station.

[0077] exist Figure 1 In the exemplary embodiment shown, transmitter node 12 includes a velocity analysis module 22. Additionally, receiver node 14 also includes a velocity analysis module 24.

[0078] However, it should be understood that, alternatively, only the velocity analysis module 22 of the transmitter node 12 or only the velocity analysis module of the receiver node 14 may be provided.

[0079] Typically, velocity analysis modules 22, 24 are configured to determine at least one velocity parameter associated with transmitter node 12 and / or receiver node 14, which will be described in more detail below.

[0080] Figure 2 An exemplary embodiment of a portion of a communication system 10 is schematically shown, which includes a portion of the communication module 16 of the transmitter node 12, a transmission path 18, and a portion of the communication module 20 of the receiver node 14.

[0081] The communication module 16 of the transmitter node 12 includes a precoding module 26 and a modulation module 28 disposed downstream of the precoding module 26.

[0082] The communication module 20 of receiver node 14 includes a demodulation module 30 and a decoding module 32 disposed downstream of the demodulation module 30.

[0083] It should be noted that communication modules 16 and 20 may include Figure 2 Other components not shown.

[0084] Specifically, the additional components can be located upstream of the precoding module 26.

[0085] Similarly, other components can be located downstream of the decoding module 32.

[0086] Typically, the communication module 16 of the transmitter node 12 and the communication module 20 of the receiver node 14 are configured to selectively employ one of at least two different transmission schemes.

[0087] Among them, at least two different transmission schemes include a first transmission scheme with higher performance at lower relative speeds between transmitter node 12 and receiver node 14, and a second transmission scheme with higher performance at higher relative speeds between transmitter node 12 and receiver node 14.

[0088] For example, the first transmission scheme can be an orthogonal frequency division multiplexing (OFDM) scheme, especially a cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) scheme or a discrete Fourier transform-extended orthogonal frequency division multiplexing (DFT-S-OFDM) scheme.

[0089] The second transmission scheme can be the orthogonal time-frequency space (OTFS) scheme or the orthogonal time-frequency multiplexing (OTFM) scheme.

[0090] The ability to use the second transmission scheme can be set above the ability to use the first transmission scheme.

[0091] exist Figure 2 In an exemplary case, the OFDM scheme can be executed by the modulation module 28 and the demodulation module 30, that is, the precoding module 26 and the decoding module 32 can be inactive.

[0092] In other words, in the first transmission mode, only the modulation module 28 and the demodulation module 30 can be active, wherein OFDM modulation is performed according to any variation known in the prior art.

[0093] In the second transmission scheme (such as the OTFS scheme), the precoding module 26 and the decoding module 32 can be activated.

[0094] In this module, the precoding module 26 can perform the inverse symplectic fast Fourier transform (ISFFT) from the delayed Doppler domain to the time-frequency domain.

[0095] ISFFT is defined by the following formula:

[0096]

[0097] Decoding module 32 can perform symptotic fast Fourier transform (SFFT) from the time-frequency domain to the delayed Doppler domain.

[0098] SFFT is defined by the following formula:

[0099]

[0100] In this context, x[k,l] is the signal in the delayed Doppler domain, while X[n,m] is the signal in the time-frequency domain.

[0101] use Figure 2 In the implementation shown, the first transmission scheme and the second transmission scheme are allowed to coexist.

[0102] The entire time slot / frame can be based on the first transmission scheme, and the resources of the second transmission scheme can be a part of the entire time slot / frame.

[0103] The communication system 10 is configured to perform a speed-based transmission scheme handover method, which is referred to below. Figure 3 To describe.

[0104] At least one velocity parameter is determined by the velocity analysis module 22 of transmitter node 12 and / or the velocity analysis module 24 of receiver node 14 (step S1).

[0105] Typically, at least one velocity parameter indicates the relative velocity between transmitter node 12 and receiver node 14.

[0106] More precisely, at least one determined velocity parameter may include the velocity of transmitter node 12, the velocity of receiver node 14, and / or the relative velocity between transmitter node 12 and receiver node 14.

[0107] For example, velocity analysis modules 22 and 24 may include GNSS modules configured to derive at least one velocity parameter from the GNSS locations of transmitter node 12 and / or receiver node 14 obtained by the respective GNSS modules.

[0108] For example, velocity analysis modules 22 and 24 can be configured to determine at least one velocity parameter based on the Doppler shift of the RF signal exchanged between transmitter node 12 and receiver node 14, specifically based on the Doppler shift of a pilot signal with a known frequency.

[0109] In another example, velocity analysis modules 22, 24 can be configured to identify at least one velocity parameter from the application layer and / or the implementation algorithm.

[0110] At least one determined speed parameter is compared with at least one speed threshold by the corresponding speed analysis modules 22, 24 (step S2).

[0111] In a particular exemplary embodiment, at least one determined speed parameter is compared with a first speed threshold and a second speed threshold, wherein the first speed threshold is greater than the second speed threshold.

[0112] If at least one comparison criterion is met in step S2, a switch is performed between a first transmission scheme associated with the lower range of at least one speed parameter and a second transmission scheme associated with the higher range of at least one speed parameter (step S3).

[0113] More precisely, if at least one determined speed parameter crosses a first speed threshold from below, a switch from the first transmission scheme to the second transmission scheme is performed.

[0114] If at least one determined speed parameter crosses the second speed threshold from above, a switch from the second transmission scheme to the first transmission scheme is performed.

[0115] Figure 4 An exemplary scenario is illustrated, showing a graph of the UE rate relative to time. In this case, for example, transmitter node 12 could be a UE device, and receiver node 14 could be a fixed base station. Therefore, at least one speed parameter could be the rate of transmitter node 12.

[0116] During the first time interval between “point 1” and “point 2”, at least one speed parameter is approximately 30 km / h and is higher than a second speed threshold, which is exemplarily set to 20 km / h.

[0117] However, because at least one speed parameter is less than a first speed threshold, which is exemplarily set to 50 km / h, the transmission scheme used by transmitter node 12 and receiver node 14 is not switched.

[0118] At point 2, at least one velocity parameter crosses the first velocity threshold from below, and the transmission scheme used by transmitter node 12 and receiver node 14 is switched to the second transmission scheme.

[0119] At point 3, at least one velocity parameter crosses the second velocity threshold from above, and the transmission scheme used by transmitter node 12 and receiver node 14 is switched to the first transmission scheme.

[0120] It should be noted that when at least one speed parameter crosses the first speed threshold from above, the transmission scheme is not switched back to the first transmission scheme.

[0121] The switch from the first transmission scheme to the second transmission scheme can be initiated based on one of the following three variations.

[0122] According to the first variant, both transmitter node 12 and receiver node 14 can automatically switch between a first transmission scheme and a second transmission scheme based on at least one determined speed parameter.

[0123] In this embodiment, at least one velocity parameter can be determined by receiver node 14 and / or transmitter node 12.

[0124] If at least one velocity parameter is determined solely by receiver node 14, then at least one velocity parameter can be transmitted from receiver node 14 to transmitter node 12.

[0125] If at least one velocity parameter is determined solely by transmitter node 12, then at least one velocity parameter can be transmitted from transmitter node 12 to receiver node 14.

[0126] According to the second variation, transmitter node 12 initiates a switch between the first and second transmission schemes. Therefore, transmitter node 12 decides whether to switch transmission schemes.

[0127] Transmitter node 12 can transmit a scheme switching instruction message to receiver node 14, and receiver node 14 can switch between a first transmission scheme and a second transmission scheme based on the scheme switching instruction message.

[0128] According to the third variation, receiver node 14 initiates a switch between the first and second transmission schemes. Therefore, receiver node 14 decides whether to switch transmission schemes.

[0129] Receiver node 14 can transmit a scheme switching instruction message to transmitter node 12, and transmitter node 12 can switch between a first transmission scheme and a second transmission scheme based on the scheme switching instruction message.

[0130] It should be noted that after switching from the first transmission scheme to the second transmission scheme, and vice versa, if the receiver node 14 or the transmitter node 12 detects worse communication performance, the receiver node 14 or the transmitter node 12 can initiate a switchback to the previous transmission scheme.

[0131] The first speed threshold can be selected based on a comparison of the performance of the transmitter node 12 and / or receiver node 14 at different speeds using the first transmission scheme and the second transmission scheme.

[0132] More precisely, the first speed threshold can be selected such that if at least one speed parameter is higher than the first speed threshold, the second transmission scheme provides better performance than the first transmission scheme.

[0133] This is Figure 5 The example illustrates a comparison of the bit error rate (BER) versus signal-to-noise ratio (SNR) obtained using OFDM and OTFS schemes with different Doppler frequency shifts (i.e., different relative rates).

[0134] Similarly, a second speed threshold can be selected such that if at least one speed parameter is below the second speed threshold, the first transmission scheme provides better performance than the second transmission scheme.

[0135] The first speed threshold and / or the second speed threshold can be determined according to the Radio Resource Control (RRC) protocol.

[0136] like Figure 5 and Figure 6 As shown, the second transmission scheme can only outperform the first transmission scheme if the modulation order and / or coding rate are limited.

[0137] In fact, in the second transmission scheme, the modulation order can be restricted to be less than or equal to a predefined modulation order threshold.

[0138] Alternatively or additionally, in the second transmission scheme, the coding rate can be limited to less than or equal to a predefined coding rate threshold.

[0139] Therefore, although a complete modulation and coding scheme (MCS) table can be used in the first transmission scheme, an adjusted MCS table or a simplified MCS table can be used in the second transmission scheme.

[0140] Figure 7 An exemplary case is shown, which illustrates an exemplary MCS table 34, which includes a variety of combinations of modulation schemes (or more precisely, modulation orders) and coding rates that can be adopted by the transmitter node 12 and the receiver node 14 in the first transmission scheme.

[0141] In the second transmission scheme, only a subset 36 of MCS table 34 is allowed, wherein subset 36 is restricted to a predefined modulation order threshold and a predefined coding rate threshold.

[0142] Furthermore, in the second transmission scheme, only consecutive resource allocations in the frequency domain can be utilized. Therefore, no gaps can be inserted between the subcarriers allocated to the second transmission scheme.

[0143] Similarly, between the two subcarriers assigned to the second transmission scheme, there may be no subcarriers assigned to different transmission schemes, especially no subcarriers assigned to the first transmission scheme.

[0144] Figure 8 The performance comparison for contiguous and non-contiguous resource allocation is shown.

[0145] Among them, the "baseline" curve corresponds to continuous resource allocation, and the other two curves correspond to blank subcarriers or OFDM subcarriers set between OTFS subcarriers.

[0146] Figure 9 A test and / or measurement system 38 configured to perform tests and / or measurements on a device under test (DUT) 40 is schematically shown.

[0147] In this context, the device under test 40 can be, for example, a transmitter node 12 or a receiver node 14 according to any of the variations described above.

[0148] In practice, the test and / or measurement system 38 includes a test and / or measurement instrument 42 with a simulation module 44 and an analysis module 46.

[0149] It is worth noting that, although both simulation module 44 and analysis module 46 are shown as being integrated into... Figure 9 The test and / or measurement instrument 42 is included, but the simulation module 44 or analysis module 46 may alternatively be built separately from the test and / or measurement instrument 42.

[0150] The simulation module 44 is configured to simulate the transmitter node 12 and / or receiver node 14 described above for use in performing tests on the device under test 40.

[0151] In other words, the simulation module 44 is configured to perform the speed-based transmission scheme switching method described above in conjunction with the device under test 40.

[0152] In this context, the simulation module 44 can simulate the velocity of the simulated receiver node or transmitter node, for example, by providing appropriate GNSS data or by applying an appropriate Doppler shift to the signals transmitted to and / or received from the device under test 40.

[0153] Analysis module 46 is connected to simulation module 44 and device under test 40.

[0154] The analysis module is configured to determine at least one performance parameter of the device under test 40 based on signals received from the simulation module 44 and / or the device under test 40.

[0155] Typically, at least one performance parameter is associated with the device under test 40 that switches between a first transmission scheme and a second transmission scheme.

[0156] For example, at least one performance parameter may include bit error rate, symbol error rate, signal-to-noise ratio, switching time spent by the device under test 40 switching between transmission schemes, and / or a parameter indicating that the switching between transmission schemes has been correctly performed by the device under test 40.

[0157] The specific embodiments disclosed herein, particularly the corresponding modules (one or more) and / or units (one or more), utilize circuit systems (e.g., one or more circuits) to implement the standards, protocols, methods, or techniques disclosed herein, operatively coupling two or more components to generate information, process information, analyze information, generate signals, encode / decode signals, convert signals, transmit and / or receive signals, control other devices, etc. Any type of circuit system can be used.

[0158] In embodiments, among other things, the circuit system includes one or more computing devices such as a processor (e.g., a microprocessor), a central processing unit (CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a system-on-a-chip (SoC), or the like, or any combination thereof; and may include discrete digital or analog circuit elements or electronic devices, or combinations thereof. In embodiments, the circuit system includes hardware circuit implementations (e.g., implementations in analog circuit systems, implementations in digital circuit systems, and the like, and combinations thereof).

[0159] In embodiments, the circuit system includes a combination of circuitry and a computer program product having software or firmware instructions stored on one or more computer-readable storage media that work together to cause the device to perform one or more protocols, methods, or techniques described herein. In embodiments, the circuit system includes circuitry that requires software, firmware, and the like for operation, such as, for example, a microprocessor or portions thereof. In embodiments, the circuit system includes one or more processors or portions thereof, along with accompanying software, firmware, hardware, and the like.

[0160] This application may refer to quantities and numbers. Unless otherwise stated, such quantities and numbers should not be considered limiting, but rather examples of possible quantities or numbers associated with this application. Additionally, in this respect, the application may use the term "multiple" to refer to quantities or numbers. In this respect, the term "multiple" means any number greater than one, such as two, three, four, five, etc. The terms "approximately," "approximately," "close to," etc., mean plus or minus 5% of the specified value.

Claims

1. A speed-based transmission scheme switching method for switching transmission schemes between a transmitter node (12) and a receiver node (14), the method comprising the following steps: - Determine at least one velocity parameter, wherein the at least one velocity parameter includes the velocity of the transmitter node (12), the velocity of the receiver node (14) and / or the relative velocity between the transmitter node (12) and the receiver node (14); and - Based on at least one determined speed parameter, switching is performed between a first transmission scheme associated with a lower range of the at least one speed parameter and a second transmission scheme associated with a higher range of the at least one speed parameter.

2. The speed-based transmission scheme switching method according to claim 1, wherein, If at least one determined speed parameter is greater than a first speed threshold, a switch from the first transmission scheme to the second transmission scheme is executed.

3. The speed-based transmission scheme switching method according to claim 1 or 2, wherein, If at least one determined speed parameter is less than a second speed threshold, a switch from the second transmission scheme to the first transmission scheme is performed.

4. The speed-based transmission scheme according to claims 2 and 3, wherein, The first speed threshold is greater than the second speed threshold.

5. The speed-based transmission scheme switching method according to any one of the preceding claims, wherein, The first transmission scheme is an orthogonal frequency division multiplexing (OFDM) scheme.

6. The speed-based transmission scheme switching method according to any one of the preceding claims, wherein, The second transmission scheme is the orthogonal time-frequency space (OTFS) scheme or the orthogonal time-frequency multiplexing (OTFM) scheme.

7. The speed-based transmission scheme switching method according to any one of the preceding claims, wherein, The first transmission scheme utilizes a complete modulation and coding scheme (MCS) table.

8. The speed-based transmission scheme switching method according to any one of the preceding claims, wherein, The second transmission scheme utilizes an adjusted modulation and coding scheme (MCS) table.

9. The speed-based transmission scheme switching method according to claim 8, wherein, The adjusted MCS table is a simplified version of the complete MCS table, or a separate MCS table with different attributes compared to the complete MCS table.

10. The speed-based transmission scheme switching method according to any one of the preceding claims, wherein, In the second transmission scheme, only continuous resources in the frequency domain are allocated.

11. The speed-based transmission scheme switching method according to any one of the preceding claims, wherein, Both the transmitter node (12) and the receiver node (14) automatically switch between the first transmission scheme and the second transmission scheme based on at least one determined speed parameter.

12. The speed-based transmission scheme switching method according to any one of claims 1 to 10, wherein, The transmitter node (12) initiates a switch between the first transmission scheme and the second transmission scheme.

13. The speed-based transmission scheme switching method according to any one of claims 1 to 10, wherein, The receiver node (14) initiates a switch between the first transmission scheme and the second transmission scheme.

14. A communication system, said communication system (10) comprising a transmitter node (12) and a receiver node (14), wherein, The communication system (10) is configured to perform a speed-based transmission scheme switching method according to any one of the preceding claims.

15. A test and / or measurement system, said test and / or measurement system (38) comprising a simulation module (44) and an analysis module (46), wherein, The simulation module (44) is configured to simulate a transmitter node (12) or a receiver node (14) to perform tests and / or measurements on the device under test (40). The simulation module (44) is configured to perform the speed-based transmission scheme switching method according to any one of claims 1 to 13 in conjunction with the device under test (40), and The analysis module (46) is configured to determine at least one performance parameter of the device under test (40), wherein the at least one performance parameter is associated with the switching of the device under test (40) between the first transmission scheme and the second transmission scheme.

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