Parameter determination method and device, communication equipment and readable storage medium

Abstract

The invention discloses a parameter determination method and device, communication equipment and a readable storage medium, and belongs to the technical field of communication, and the parameter determination method of the embodiment of the invention comprises the steps that the communication equipment obtains an imitated radio frequency division multiplexing (AFDM) parameter set; and according to the AFDM parameter set, determining a target AFDM parameter.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to a parameter determination method, apparatus, communication equipment and readable storage medium. Background Art

[0002] Affine Frequency Division Multiplexing (AFDM) is a multi-carrier modulation method that can achieve reliable communication in linear time-varying (LTV) channels. Under appropriate parameter configuration, sub-channels of different reflection paths can be completely separated in the transform domain. By utilizing this feature, on the one hand, the highest degree of freedom or diversity gain can be theoretically obtained, improving the communication performance under the LTV channel; on the other hand, this is very friendly to perception services. Only channel estimation is required to measure the reflectors in the wireless environment. The delay and Doppler shift of each sub-channel of AFDM corresponds to the distance and speed of a reflector (or reflection cluster). However, these benefits all depend on appropriate parameter configuration. In this case, how to determine the AFDM parameters is an urgent problem to be solved. Summary of the invention

[0003] The embodiments of the present application provide a parameter determination method, apparatus, communication device, and readable storage medium, which can solve the problem of how to determine AFDM parameters.

[0004] In a first aspect, a parameter determination method is provided, which is performed by a communication device, and the method includes:

[0005] The communication device obtains an AFDM parameter set;

[0006] The communication device determines target AFDM parameters according to the AFDM parameter set.

[0007] In a second aspect, a parameter determination device is provided, which is applied to a communication device, including:

[0008] An acquisition module, used for acquiring an AFDM parameter set;

[0009] A determination module is used to determine target AFDM parameters according to the AFDM parameter set.

[0010] According to a third aspect, a communication device is provided, comprising a processor and a memory, wherein the memory stores a program or instruction that can be executed on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0011] In a fourth aspect, a communication device is provided, including a processor and a communication interface, wherein the processor is used to obtain an AFDM parameter set; and determine target AFDM parameters according to the AFDM parameter set.

[0012] In a fifth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented.

[0013] In a sixth aspect, a wireless communication system is provided, including: a terminal and a network side device, wherein the terminal or the network side device can be used to execute the steps of the method described in the first aspect.

[0014] In a seventh aspect, a chip is provided, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the steps of the method described in the first aspect.

[0015] In an eighth aspect, a computer program / program product is provided, wherein the computer program / program product is stored in a storage medium, and the program / program product is executed by at least one processor to implement the steps of the method described in the first aspect.

[0016] In an embodiment of the present application, with the help of the introduced AFDM parameter set, the required target AFDM parameters can be determined, and on the one hand, the flexibility and effectiveness of the AFDM parameter configuration can be improved to meet the needs of communication services and perception services in different scenarios. On the other hand, the introduction of the AFDM parameter set can indicate the corresponding AFDM parameters by indicating the sequence number / index in the AFDM parameter set, and can also reduce signaling overhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a block diagram of a wireless communication system to which the embodiments of the present application can be applied;

[0018] Figure 2 It is a schematic diagram of an OFDM signal in the TF domain in an embodiment of the present application;

[0019] Figure 3 is a schematic diagram of an AFDM signal in the TF domain in an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of an equivalent channel in an embodiment of the present application;

[0021] Figure 5 is a flow chart of a parameter determination method provided in an embodiment of the present application;

[0022] Figure 6This is a schematic diagram of the coexistence of OFDM and AFDM in an embodiment of the present application;

[0023] Figure 7 is a structural schematic diagram of a parameter determination device provided in an embodiment of the present application;

[0024] Figure 8 It is a structural diagram of a communication device provided in an embodiment of the present application;

[0025] Fig. 9 is a schematic diagram of the structure of a terminal provided in an embodiment of the present application;

[0026] Fig.10 It is a structural diagram of a network side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0028] The terms "first", "second", etc. of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of one type, and the number of objects is not limited, for example, the first object can be one or more. In addition, "or" in the present application represents at least one of the connected objects. For example, "A or B" covers three schemes, namely, Scheme 1: including A but not including B; Scheme 2: including B but not including A; Scheme 3: including both A and B. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0029] The term "indication" in this application can be a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, operations to be performed, or request results in the sent indication; an indirect indication can be understood as the receiver determining the corresponding information according to the indication sent by the sender, or making a judgment and determining the operation to be performed or the request result according to the judgment result.

[0030] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the systems and radio technologies mentioned above as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for illustrative purposes, and NR terminology is used in most of the following descriptions, but these technologies can also be applied to systems other than NR systems, such as the 6th generation (6 th Generation, 6G) communication system.

[0031] Figure 1A block diagram of a wireless communication system applicable to an embodiment of the present application is shown. The wireless communication system includes a terminal 11 and a network side device 12. Among them, the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (Ultra-mobile Personal Computer, UMPC), a mobile Internet device (Mobile Internet Device, MID), an augmented reality (Augmented Reality, AR), a virtual reality (Virtual Reality, VR) device, a robot, a wearable device (Wearable Device), an aircraft (flight vehicle), a vehicle-mounted device (Vehicle User Equipment, VUE), a ship-mounted device, a pedestrian terminal (Pedestrian User Equipment, PUE), a smart home (home appliances with wireless communication functions, such as refrigerators, televisions, washing machines or furniture, etc.), a game console, a personal computer (Personal Computer, PC), a teller machine or a self-service machine and other terminal side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be referred to as a radio access network (Radio Access Network, RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (Wireless Local Area Network, WLAN) access point (Access Point, AP) or a wireless fidelity (Wireless Fidelity, WiFi) node, etc.Among them, the base station can be called Node B (Node B, NB), Evolved Node B (Evolved Node B, eNB), the next generation Node B (the next generation Node B, gNB), New Radio Node B (New Radio Node B, NR Node B), access point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (Base Transceiver Station, BTS), radio base station, radio transceiver, Basic Service Set (Basic Service Set, BSS), Extended Service Set (Extended Service Set, ESS), home Node B (home evolved Node B, HNB), home evolved Node B (home evolved Node B), Transmission Reception Point (Transmission Reception Point, TRP) or other appropriate terms in the field, as long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary.

[0032] In order to facilitate understanding of the embodiments of the present application, the following contents are first described.

[0033] Orthogonal Frequency Division Multiplex (OFDM) is a classic multi-carrier modulation method. When pulse shaping (such as time domain windowing) is not performed, one subcarrier is a single-frequency signal with a time domain length equal to the OFDM symbol length, and the symbol to be sent is modulated on each subcarrier. The baseband time domain signal expression can be expressed as:

[0034]

[0035] Among them, x m represents the actual symbol sent by the mth subcarrier, which can be a common Quadrature Amplitude Modulation (QAM) symbol; s[l] represents the value of the baseband time domain signal of each OFDM symbol at the lth sampling point; M is the total number of subcarriers in the OFDM system; L is the total number of sampling points in an OFDM symbol; is the value of the basis function of the mth subcarrier at the lth sampling point, and its specific expression is:

[0036]

[0037] From the above, we can see that the OFDM system divides subcarriers completely according to frequency, and different QAM symbols are modulated on different subcarriers to achieve the purpose of orthogonal multiplexing. The schematic diagram in the TF domain is as follows Figure 2 As shown in the figure, Δt represents the time domain interval of the sampling points, 1 / Δt is the total bandwidth of the OFDM system, and NΔt is the time domain length of an OFDM symbol. In other words, the OFDM system modulates M QAM symbols into a single subcarrier with the same symbol length of NΔt and a subcarrier interval of ( Figure 2 Corresponding This is because, generally speaking, L=M).

[0038] Since the exponential function is the characteristic function of the linear time-invariant system (LTI), and one basis function (corresponding to one subcarrier) of the OFDM system is also an exponential function, the QAM symbol modulated on a subcarrier of the OFDM system, after LTI, the received signal is just the multiplication of the QAM symbol and a complex value. For example, the symbol received by the receiving end at the mth subcarrier is y m =h m x m That is to say, the receiver only needs to estimate the channel and obtain h m After the estimated value of y m and h m Do a simple division and restore to x m This process is the single-tap equalization method for OFDM system.

[0039] However, for non-LTI channels, the channel characteristic function is no longer a fixed function, and the equalization of the OFDM system becomes very complicated. At the same time, if the channel changes very quickly, such as in high-speed mobile scenarios, OFDM cannot track the channel changes well, and the demodulation performance cannot be guaranteed.

[0040] Similar to OFDM, AFDM is also a multi-carrier modulation method, but its main design motivation is to improve the performance of multi-carrier communication systems in linear time-varying systems (LTV). The basis function of the AFDM system is no longer a single-frequency signal of OFDM, but a linear frequency modulation signal similar to chirp. The specific expression of its basis function is:

[0041]

[0042] Among them, m is the subcarrier index, which also determines the starting frequency of the basis function; c1 and c2 are two constants that determine the characteristics of the AFDM system. Generally speaking, c2 only needs to select a small irrational number to obtain the best performance, while the choice of c1 will determine the frequency sweep rate of the basis function, which will affect the capture of channel dynamics and have a greater impact on the input and output relationship of the signal.

[0043] Based on the definition of AFDM basis functions, the baseband time domain signal expression of the AFDM system can be expressed as:

[0044]

[0045] Formula (1.4) actually defines a new mathematical transformation, called Inverse Discrete Affine Frequency Transform (IDAFT). From the above, we can see that the AFDM system divides the subcarriers with different starting frequencies, and the basis function is a number of linear frequency modulation waves. The schematic diagram in the TF domain is as follows: Figure 3 shown. Figure 3 α in max Represents the maximum integer Doppler shift normalized to the subcarrier spacing.

[0046] IDAFT has quasi-periodicity in the time domain. For the kth period, we have:

[0047]

[0048] Based on quasi-periodicity, a Chirp-Periodic Prefix (CPP) can be designed for the AFDM system to resist inter-symbol interference (ISI):

[0049]

[0050] Among them, L cp Indicates the length of CPP.

[0051] The system implementation of AFDM depends on IDAFT and DAFT. First, IDAFT and DAFT are written in matrix form. If the discrete sampling sequence in the time domain and the sample sequence in the transform domain are recorded as s = (s0, s1, ..., s L-1 ), S=(S0,S1,...,S M-1 ), then their relationship can be expressed as:

[0052]

[0053] in, and are two diagonal matrices of compensation phase.

[0054] Next, if x∈C M×1 Expressed as the QAM symbol sequence to be sent, then the modulated time domain sample sequence can be expressed as:

[0055]

[0056] Therefore, the transmission and reception of AFDM can be realized with a structure similar to that of OFDM transmission and receiver. The received signal at the receiving end can be expressed as:

[0057]

[0058] Among them, Π, and They are the forward cyclic shift matrix, the Doppler frequency shift matrix, and the phase shift matrix:

[0059]

[0060]

[0061]

[0062] After matching the received signal, the output symbol estimate in the transform domain can be obtained:

[0063]

[0064] Formula (13) describes the relationship between input symbols and output symbols in AFDM. eff is the equivalent channel in the transform domain, which can be expressed as:

[0065]

[0066] Where P is the total number of scatterers that make up the channel (i.e., the path that the signal arrives on). From the above expression, we can see that the equivalent channel H eff is the subchannel H corresponding to the reflection path in space i The corresponding delay is d i .

[0067] In fact, each subchannel H i All have a strip or quasi-strip structure, depending on whether the Doppler shift is an integer multiple of the subcarrier spacing, that is, an integer Doppler shift or a fractional Doppler shift.

[0068] By optimizing the parameter c1, H i There is no overlap between them and they are completely separated, thus characterizing the entire channel and obtaining the maximum degree of freedom or diversity gain.eff will become like Figure 4 shape. Figure 4 In the case of Doppler frequency shift, the channel response of each path will shift left or right from its center, with a maximum shift value of ±α max , α max is the maximum integer Doppler shift.

[0069] According to the signal expression of AFDM (such as formula (4)), the basic parameters that determine the AFDM signal include but are not limited to the following:

[0070] 1) The number of time domain sampling points of an AFDM symbol: L;

[0071] 2) Absolute time interval of time domain sampling points / absolute time length of code chips: T c ;

[0072] 3) Number of subcarriers: M;

[0073] 4) The bandwidth occupied by the AFDM signal: B;

[0074] 5) Subcarrier spacing: SCS; the bandwidth occupied by the AFDM signal, i.e., the number of frequency domain resources, is equal to the subcarrier spacing multiplied by the number of subcarriers, i.e., B = SCS·M;

[0075] 6) AFDM symbol length: T s For example, T s =LT c , or, T s =1 / SCS;

[0076] 7) Index of the subcarrier used by the AFDM symbol: m; the subcarrier used by this AFDM symbol can be understood as the subcarrier actually used for AFDM transmission, that is, the subcarrier actually carrying the AFDM data symbol; 0≤m≤M-1, that is, the actually used subcarrier can be 1 or more, but the number does not exceed the number of subcarriers M;

[0077] 8) The frequency variation of a single / each subcarrier over time, or the slope of the frequency: c1; Here, the frequency variation of each subcarrier over time is the same, which can be understood as the frequency variation of each subcarrier in the multiple subcarriers transmitted by AFDM over time;

[0078] 9) Phase offset of each subcarrier: c2; From formula (4), we can see that for the mth subcarrier, the additional phase offset added is m 2 c2;

[0079] 10) CPP length of AFDM symbol.

[0080] The parameter determination method, apparatus, communication device, and readable storage medium provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through some embodiments and their application scenarios.

[0081] See also Figure 5 , Figure 5 is a flow chart of a parameter determination method provided in an embodiment of the present application, the method being executed by a communication device, such as Figure 5 As shown, the method comprises the following steps:

[0082] Step 51: The communication device obtains an AFDM parameter set;

[0083] Step 52: The communication device determines the target AFDM parameters according to the AFDM parameter set.

[0084] In the embodiment of the present application, the communication device can be a transmitting end or a receiving end, can be a terminal or a network side device, and is not limited to this. The AFDM parameter set can be one or more AFDM parameter sets, and the corresponding determined target AFDM parameters can be a group of AFDM parameters in an AFDM parameter set.

[0085] Optionally, each group of AFDM parameters in the AFDM parameter set includes at least one of the following:

[0086] The change of the frequency of each subcarrier over time is such as c1 in the above formula (4); here, the change of the frequency of each subcarrier over time is the same, which can be understood as the change of the frequency of each subcarrier in the multiple subcarriers transmitted by AFDM over time;

[0087] The phase offset of each subcarrier is c2 in the above formula (4). The value of c2 is generally a fixed value. For the mth subcarrier, the additional phase offset added is m 2 c2.

[0088] Therefore, with the help of the introduced AFDM parameter set, the required target AFDM parameters can be determined. On the one hand, the flexibility and effectiveness of the AFDM parameter configuration can be improved to meet the needs of communication services and perception services in different scenarios. On the other hand, the introduction of the AFDM parameter set can indicate the corresponding AFDM parameters by indicating the sequence number / index in the AFDM parameter set, which can also reduce the signaling overhead.

[0089] Optionally, each group of AFDM parameters in the AFDM parameter set may further include at least one of the following:

[0090] The number of time domain sampling points of an AFDM symbol is L;

[0091] The absolute time interval T of the time domain sampling points c ;

[0092] Absolute time length of chip T c ;

[0093] The number of subcarriers M;

[0094] The bandwidth B occupied by the AFDM signal can be understood as the number of frequency domain resources, which is equal to the subcarrier spacing multiplied by the number of subcarriers, that is, B = SCS·M;

[0095] Subcarrier spacing SCS;

[0096] AFDM symbol length T s ;

[0097] The index m of the subcarrier used by the AFDM symbol; the subcarrier used by this AFDM symbol can be understood as the subcarrier actually used for AFDM transmission, that is, the subcarrier actually carrying the AFDM data symbol;

[0098] CPP length of AFDM symbol.

[0099] It should be noted that the values ​​of the above AFDM parameters can be determined according to specific communication or perception service requirements. For the above interrelated parameters, only some of them need to be determined, and the other parameters can be determined accordingly. For example, after the AFDM symbol length is determined, the subcarrier spacing SCS can also be determined accordingly.

[0100] Since the number of sampling points L after sampling an AFDM symbol is usually the same as the number of IFFT / FFT points M at the transmitter / receiver, and M is the number of subcarriers transmitted, L=M. However, in actual implementations, in order to reduce out-of-band interference or for other considerations, the number of subcarriers actually used may be less than M, denoted as M′. Obviously, at this time, it is only necessary to set the data on the unused subcarriers to 0, and the normal M=L points can be used for FFT / IFFT processing. During digital-to-analog conversion / analog-to-digital conversion (DAC / ADC), the number of time domain sampling points processed is M=L.

[0101] In addition, in some embodiments, L may be set not equal to M. The main benefit of this is that it allows the receiving end to process symbols with different numbers of subcarriers at the same sampling rate. For example, when L=2M>M, the transmitting end can perform IFFT (and other operations) on the M data to obtain M time domain sampling points, which are converted into a time domain continuous waveform after passing through the DAC. The receiving end samples the time domain continuous waveform at L points to obtain L sampling points. Next, these L sampling points are downsampled, for example, one sampling point is taken every 2 sampling points to obtain M sampling points, and FFT (and other operations) are performed on these M sampling points to recover the data on the M subcarriers.

[0102] In some embodiments, the AFDM parameter set may be as shown in Table 1 below:

[0103] Table 1

[0104] Serial number SCS B <![CDATA[c1]]> <![CDATA[c2]]> CPP #1 SCS 1 B1 <![CDATA[c1 1]]> <![CDATA[c2 1]]> CPP 1 #2 SCS2 B2 <![CDATA[c1 2]]> <![CDATA[c2 2]]> CPP 2 …… …… …… …… …… ……

[0105] In the above Table 1, "serial number" represents the serial number of the AFDM parameter group in the AFDM parameter set, that is, each row in Table 1 (except the first row) represents a set of AFDM parameters, where "c1" represents the frequency change of each subcarrier over time, and "c2" represents the phase offset of each subcarrier.

[0106] Since the value of c2 is generally a fixed value, the c2 column in the above Table 1 can be an optional parameter and is changed to the following Table 2:

[0107] Table 2

[0108]

[0109]

[0110] In addition to the AFDM parameter sets shown in Tables 1 and 2 above, a more comprehensive AFDM parameter set may also be set / defined, such as shown in Table 3 below:

[0111] Table 3

[0112] Serial number SCS B <![CDATA[c1]]> <![CDATA[c2]]> L <![CDATA[T c ]]> {m} CPP #1 SCS1 B 1 <![CDATA[c11]]> <![CDATA[c21]]> L 1 <![CDATA[T c 1]]> {m}1 CPP 1 #2 SCS2 B 2 <![CDATA[c12]]> <![CDATA[c22]]> L 2 <![CDATA[T c 2]]> {m}2 CPP 2 …… …… …… …… …… …… …… …… ……

[0113] It should be noted that the above Table 3 represents a set of usable AFDM parameters. In practical applications, the parameters in Table 3 may also have other equivalent forms, for example: when M is determined, SCS or B may not be indicated; when T s When given, N or T may not be indicated. c ; When AFDM subcarriers are used continuously, {m} can be replaced by the starting subcarrier index and the ending subcarrier index.

[0114] In addition, when some AFDM parameters are fixed parameters agreed upon by the system, they can be deleted from the AFDM parameter set. Alternatively, some AFDM parameters can also be directly indicated as original values ​​instead of being indicated in the form of an AFDM parameter set, in which case these AFDM parameters can also be deleted from the AFDM parameter set.

[0115] Optionally, when the AFDM parameter set does not include the frequency variation of each subcarrier over time or the phase offset of each subcarrier, the parameter determination method may further include:

[0116] The communication device obtains first information, where the first information is used to configure or indicate at least one of the following in AFDM transmission: a frequency change of each subcarrier over time, a phase offset of each subcarrier; optionally, the first information can be carried by downlink control information (Downlink Control Information, DCI), sidelink control information (Sidelink Control Information, SCI), uplink control information (Uplink Control Information, UCI) or medium access control control element (Medium Access Control Control Element, MAC CE) signaling, etc.;

[0117] The communication device determines at least one of the following items in AFDM transmission based on the first information: the frequency change of each subcarrier over time and the phase offset of each subcarrier.

[0118] In this way, the communication device can obtain the required AFDM parameters to meet the AFDM transmission requirements.

[0119] Optionally, the frequency change of each subcarrier over time and the phase offset of each subcarrier can also be obtained from the AFDM parameter set and the first information respectively. For example, the AFDM parameter set includes the frequency change of each subcarrier over time, and the first information configures or indicates the phase offset of each subcarrier.

[0120] In the embodiments of the present application, different parameter indication methods based on the AFDM parameter set may be adopted, as described below.

[0121] Method 1:

[0122] In this mode 1, the above-mentioned acquisition of the AFDM parameter set may include: the communication device determines an AFDM parameter set based on a pre-agreed or received first indication.

[0123] Determining the target AFDM parameters according to the AFDM parameter set may include:

[0124] The communication device determines a group of AFDM parameters in the one AFDM parameter set as the target AFDM parameters;

[0125] or,

[0126] The communication device determines a group of AFDM parameters in the one AFDM parameter set as the target AFDM parameters based on the received second indication.

[0127] That is to say, under this mode 1, an AFDM parameter set can be pre-agreed or indicated, and then the communication device determines a group of AFDM parameters in the AFDM parameter set as target AFDM parameters based on its own implementation or indication.

[0128] Optionally, the first indication mentioned above may be a radio resource control (Radio Resource Control, RRC) signaling or the like.

[0129] Optionally, the second indication may be signaling such as downlink control information (Downlink Control Information, DCI), sidelink control information (Sidelink Control Information, SCI), uplink control information (Uplink Control Information, UCI), or a medium access control control element (Medium Access Control Control Element, MAC CE).

[0130] For example, an AFDM parameter set may be pre-agreed or configured through RRC signaling, and then a set of AFDM parameters therein may be activated as target AFDM parameters through DCI, SCI, UCI, MAC CE and other signaling.

[0131] For another example, an AFDM parameter set can be pre-agreed or configured through RRC signaling, and then a set of AFDM parameters can be selected as target AFDM parameters according to the conditions of the transmitter or receiver. For example, when the terminal initially accesses the network, a set of AFDM parameters can be selected as target AFDM parameters from the table corresponding to the AFDM parameter set according to the parameters supported by itself, such as the maximum SCS, and transmitted based on the target AFDM parameters.

[0132] Method 2:

[0133] In this mode 2, the above-mentioned acquisition of the AFDM parameter set may include:

[0134] The communication device determines a plurality of AFDM parameter sets based on a pre-agreed or received third indication;

[0135] The communication device determines, based on the received fourth indication, an AFDM parameter set from the plurality of AFDM parameter sets;

[0136] The communication device determines the target AFDM parameters according to the AFDM parameter set, including:

[0137] The communication device determines a group of AFDM parameters in the one AFDM parameter set as the target AFDM parameters; or,

[0138] The communication device determines, based on the received fifth indication, a group of AFDM parameters in the one AFDM parameter set as the target AFDM parameters.

[0139] That is to say, under this method 2, multiple AFDM parameter sets can be pre-agreed or indicated, and then one of the AFDM parameter sets can be indicated. Finally, the communication device determines a set of AFDM parameters in the one AFDM parameter set as the target AFDM parameters based on its own implementation or indication.

[0140] Optionally, the third indication mentioned above may be RRC signaling, etc.

[0141] Optionally, the fourth indication mentioned above may be signaling such as MAC CE.

[0142] Optionally, the fifth indication mentioned above may be signaling such as DCI, SCI, UCI, or MAC CE.

[0143] For example, multiple AFDM parameter sets may be pre-agreed or configured through RRC signaling, and then one of the AFDM parameter sets may be activated by MAC CE, and finally one of the AFDM parameter sets may be activated as the target AFDM parameters by DCI, SCI, UCI and other signaling.

[0144] In this way, with the help of the parameter indication method based on the AFDM parameter set, the signaling indication overhead can be saved; but it does not rule out directly indicating all or part of the parameters, or parameter indication based on non-parameter sets or semi-parameter sets, which can achieve higher flexibility.

[0145] In the embodiment of the present application, the AFDM communication system may need to determine AFDM parameters according to a variety of constraints, and if an unknown or rapidly changing wireless environment is encountered, it may not be possible to determine the current appropriate parameters immediately. To address this problem, parameter adaptive adjustment may be performed.

[0146] Optionally, if the communication device is a transmitting end, the parameter determination method may further include:

[0147] The transmitting end sends multiple AFDM reference signals to the receiving end on multiple orthogonal resources based on multiple groups of AFDM parameters;

[0148] The transmitting end receives first feedback information from the receiving end; the first feedback information is used to indicate a first target group AFDM parameter selected from the multiple groups of AFDM parameters;

[0149] The transmitting end sends a sixth indication to the receiving end according to the AFDM parameters of the first target group, where the sixth indication is used to indicate the AFDM parameters used by the transmitting end to subsequently send AFDM signals.

[0150] Optionally, if the communication device is a receiving end, the parameter determination method may further include:

[0151] The receiving end receives, on a plurality of orthogonal resources, a plurality of AFDM reference signals sent by the transmitting end, respectively, wherein the plurality of AFDM reference signals are sent based on a plurality of groups of AFDM parameters;

[0152] The receiving end sends first feedback information to the transmitting end, where the first feedback information is used to indicate a first target group of AFDM parameters selected from the multiple groups of AFDM parameters;

[0153] The receiving end receives the sixth indication sent by the transmitting end; the sixth indication is determined based on the AFDM parameters of the first target group, and is used to indicate the AFDM parameters used by the transmitting end to subsequently send AFDM signals.

[0154] Here, the above process can be applied to parameter determination when the terminal initially accesses. The first target group AFDM parameters can be determined according to the constraint conditions and the reception conditions of multiple AFDM reference signals. The constraint conditions can be related to communication quality, perceived quality or self-constraint information.

[0155] The AFDM reference signal can be independently sent based on multiple groups of different AFDM parameters, and may include but is not limited to a sounding reference signal (SRS), a channel state information reference signal (CSI-RS), a phase tracking reference signal (TRS), a synchronization signal block (SSB), etc.

[0156] The first feedback information may be in various forms, for example, the recommended AFDM parameters may be indicated directly based on UCI or DCI indication, or according to the mapping relationship between the reference signal and the random access opportunity (Random Access Opportunity, RO) and the random access preamble (Preamble), through RACH indication.

[0157] The sixth indication may be selected from but not limited to UCI, DCI, SCI, MAC CE, RRC signaling, etc. For example, when indicating the AFDM parameters used by the transmitter to subsequently send an AFDM signal, the AFDM parameter group number in the corresponding AFDM parameter set may be indicated, or a specific parameter value may be directly indicated.

[0158] Optionally, the multiple groups of AFDM parameters may satisfy at least one of the following:

[0159] pre-agreed;

[0160] Based on signaling indication, that is, the value of AFDM parameters is directly indicated;

[0161] Selected from a pre-agreed or indicated set of AFDM parameters.

[0162] Optionally, the multiple orthogonal resources may be pre-agreed or indicated. The multiple orthogonal resources may satisfy at least one of the following:

[0163] They are orthogonal resources in the time domain;

[0164] In the frequency domain, they are orthogonal resources;

[0165] They are orthogonal resources in the code domain.

[0166] For example, the parameter determination process when the terminal initially accesses may include:

[0167] Step 1. The transmitting end, such as a UE or a network side device, sends an AFDM reference signal on multiple orthogonal resources; for example, the AFDM reference signal is independently sent based on multiple sets of different AFDM parameters;

[0168] Step 2. After receiving the AFDM reference signal, the receiving end selects a set of preferred parameters from multiple sets of different AFDM parameters, or the AFDM reference signal corresponding to the set of parameters;

[0169] Step 3. The receiving end sends a first feedback information to the transmitting end according to the selected AFDM reference signal / AFDM parameter to recommend a set of AFDM parameters to the transmitting end;

[0170] Step 4. The transmitter indicates to the receiver the AFDM parameters used for subsequent transmission of the AFDM signal, for example, through UCI, DCI, SCI, MAC CE, RRC, etc.

[0171] It should be noted that if the receiving end has the right to decide on the AFDM parameters to be used, then the receiving end can directly indicate the AFDM parameters to be used to the transmitting end. The constraints considered by the transmitting end and the receiving end in determining the preferred parameters may include but are not limited to communication quality, perception quality, self-constraint information, etc.

[0172] In addition to the above parameter adjustment method, in this embodiment, parameter update can also be performed after the initial access of the terminal (such as RRC connection state). In this case, the transmitting end can send a small number of reference signals, for example, based on the AFDM parameters (sets) being used, select one or more groups of AFDM parameters (sets) that are close to each other to send corresponding reference signals, thereby using fewer resources.

[0173] Optionally, if the communication device is a transmitting end, the parameter determination method may further include:

[0174] The transmitting end sends a corresponding AFDM reference signal to the receiving end based on at least one set of AFDM parameters whose difference from the AFDM parameters in use is less than or equal to a threshold; the threshold may be set based on actual needs;

[0175] The transmitting end receives second feedback information from the receiving end; the second feedback information is used to indicate a second target group of AFDM parameters selected from the at least one group of AFDM parameters;

[0176] The transmitting end sends a seventh indication to the receiving end according to the AFDM parameters of the second target group, where the seventh indication is used to indicate the AFDM parameters used by the transmitting end to subsequently send AFDM signals.

[0177] Optionally, if the communication device is a receiving end, the parameter determination method may further include:

[0178] The receiving end receives an AFDM reference signal sent by the transmitting end, wherein the AFDM reference signal is sent based on at least one set of AFDM parameters whose difference from the AFDM parameters being used is less than or equal to a threshold; the threshold may be set based on actual needs;

[0179] The receiving end sends second feedback information to the transmitting end, where the second feedback information is used to indicate a second target group of AFDM parameters selected from the at least one group of AFDM parameters;

[0180] The receiving end receives the seventh indication sent by the transmitting end; the seventh indication is determined based on the AFDM parameters of the second target group, and is used to indicate the AFDM parameters used by the transmitting end to subsequently send AFDM signals.

[0181] Here, the above process can be applied to parameter update after the initial access of the terminal (such as RRC connection state). The second target group AFDM parameters can be determined according to the constraint conditions and the reception of the AFDM reference signal. The constraint conditions can be related to communication quality, perceived quality or self-constraint information.

[0182] The AFDM reference signal may be sent based on one or more groups of AFDM parameters close to the AFDM parameters being used, and may include but is not limited to SRS, CSI-RS, TRS, SSB, etc.

[0183] The second feedback information may be in various forms. For example, it may be directly based on UCI or DCI indication. In addition, the second feedback information may only indicate the difference of the updated parameter or the difference of the parameter set sequence number, thereby reducing signaling overhead.

[0184] The seventh indication may be selected from but not limited to UCI, DCI, SCI, MAC CE, RRC signaling, etc. For example, when indicating the AFDM parameters used by the transmitter to subsequently send an AFDM signal, only the difference in the updated parameters or the difference in the parameter set sequence number may be indicated, thereby reducing signaling overhead.

[0185] Optionally, in the case of sending multiple AFDM reference signals, the AFDM reference signals may be sent respectively on multiple orthogonal resources. The multiple orthogonal resources may be orthogonal resources in the time domain, frequency domain or code domain.

[0186] Optionally, the above constraint condition may be related to at least one of the following:

[0187] Communication quality, the communication quality includes at least one of the following: communication delay, communication rate, useful signal strength, interference signal strength, usage of coexisting systems, and channel resolution; for example, the useful signal strength may be in the form of reference signal received power (RSRP), received signal strength indication (RSSI), channel quality indication (CQI), etc.; the interference signal strength may be RSRP, RSSI, etc.; the usage of the coexisting system may include resource elements (RE) with high priority signals from different systems; the channel resolution affects the quality of both communication and perception services;

[0188] Perceptual quality, the perceptual quality comprising at least one of the following: channel resolution, maximum unambiguous speed;

[0189] Self-constraint information, wherein the self-constraint information includes at least one of the following: maximum bandwidth, maximum sampling rate, minimum sampling time interval, and maximum symbol length.

[0190] Several constraints involved in this embodiment are described below.

[0191] 1) Communication delay

[0192] The receiver of the AFDM signal needs to receive at least one entire AFDM symbol before it can perform demodulation processing. Therefore, the minimum reception delay of AFDM is limited by the length of the AFDM symbol. In other words, if the maximum delay that the AFDM system needs to meet is x seconds, then the following conditions must be met:

[0193] a) AFDM symbol length: T s <x

[0194] b) Subcarrier spacing:

[0195] 2) Channel resolution

[0196] An important benefit of AFDM is that AFDM can separate the channel responses of independent subchannels from multiple subpaths in the transform domain. However, since the channel response of each subpath may be offset within the range of positive and negative maximum Doppler shift, such as Figure 4 As shown, if it is necessary to ensure that the channel responses of each subpath do not overlap with each other, the following conditions need to be met:

[0197] A) Doppler shift is an integer:

[0198]

[0199] B) There is a fractional Doppler shift:

[0200]

[0201] The above A) and B) can be equivalent to the following conditions:

[0202] a) Doppler shift is an integer:

[0203]

[0204] b) There is a fractional Doppler shift:

[0205]

[0206] Here, the above α max is the maximum integer Doppler frequency shift value, the above k υ represents the dispersion value of fractional Doppler shift.i represents the delay value of the ith subchannel (path). These parameters are determined by the characteristics of the channel itself. When the channel is given, the above formula (17) or (18) can be satisfied by increasing L and / or c1. At this time, the maximum channel resolution can be achieved.

[0207] 3) Maximum unambiguous speed

[0208] If we look at a certain subcarrier of AFDM alone, its signal expression is a common chirp signal that appears cyclically, or called a linear frequency modulation wave, and the actual time to scan the spectrum once corresponds to the pulse repetition interval (PRI) in the time domain:

[0209]

[0210] Here, the PRI of the chirp signal determines the maximum unambiguous speed ν used for speed measurement. max , the corresponding relationship is:

[0211]

[0212] Where λ is the wavelength of the carrier signal.

[0213] Therefore, according to the above formulas (19) and (20), given the maximum unambiguous speed v that needs to be satisfied, max Under the constraint of c Or when the carrier wavelength λ is given, where λf c =c, c is the speed of light, we can use Determine the minimum PRI value that needs to be met to determine B, c1, and T c When any two of the three are given, the value range of another parameter can be obtained. Obviously, if at least two of the three are not determined, we only need to take the value that satisfies the constraints.

[0214] It should be noted that the carrier frequency or carrier wavelength is also an adjustable parameter. If the above formulas (19) and (20) are combined, we have:

[0215]

[0216] Then, only 4 parameters are needed to satisfy the following constraints:

[0217]

[0218] 4) Interference to coexisting systems

[0219] When the AFDM system coexists with other systems, the parameters of the AFDM system can be adjusted according to the spectrum usage of the coexisting system. Figure 6 As shown in the figure, when the coexistence system is an OFDM system and occupies the four REs in the lower left corner to send the Physical Downlink Control Channel (PDCCH), the AFDM system can choose to start transmission from subcarrier 2, that is, to leave subcarrier 1 empty, to avoid conflict with these four more important REs, thereby reducing mutual interference between the coexistence systems.

[0220] 5) Other constraints

[0221] In addition to the above constraints, the communication rate requirements may also need to be considered. The parameter setting of the AFDM system also needs to meet the constraints of the system itself. For example, most communication systems are band-limited systems with a given bandwidth, so the bandwidth B has the largest constraint, and T c However, it is limited by the sampling rate of the receiver / sender and has a minimum value.

[0222] The parameter determination method provided in the embodiment of the present application can be executed by a parameter determination device. In the embodiment of the present application, the parameter determination device provided in the embodiment of the present application is described by taking the parameter determination method executed by the parameter determination device as an example.

[0223] See also Figure 7 , Figure 7 is a schematic diagram of a parameter determination device provided in an embodiment of the present application, and the device is applied to a communication device, such as a transmitting end or a receiving end. Figure 7 As shown, the parameter determination device 70 includes:

[0224] An acquisition module 71 is used to acquire an AFDM parameter set;

[0225] The determination module 72 is used to determine the target AFDM parameters according to the AFDM parameter set.

[0226] Optionally, each group of AFDM parameters in the AFDM parameter set includes at least one of the following:

[0227] The amount by which the frequency of each subcarrier changes over time;

[0228] The phase offset of each subcarrier.

[0229] Optionally, the acquisition module 71 is further used to: acquire first information, where the first information is used to configure or indicate at least one of the following items in AFDM transmission: a frequency variation of each subcarrier over time, and a phase offset of each subcarrier;

[0230] The determination module 72 is further used to determine, according to the first information, at least one of the following items in AFDM transmission: a frequency variation of each subcarrier over time, and a phase offset of each subcarrier.

[0231] Optionally, the acquisition module 71 is specifically used to: determine an AFDM parameter set based on a pre-agreed or received first indication;

[0232] The determination module 72 is specifically used to: determine a group of AFDM parameters in the one AFDM parameter set as the target AFDM parameters, or, based on the received second indication, determine a group of AFDM parameters in the one AFDM parameter set as the target AFDM parameters.

[0233] Optionally, the acquisition module 71 is specifically used to: determine a plurality of AFDM parameter sets based on a pre-agreed or received third indication; and determine an AFDM parameter set from the plurality of AFDM parameter sets based on a received fourth indication;

[0234] The determination module 72 is specifically used to: determine a group of AFDM parameters in the one AFDM parameter set as the target AFDM parameters, or, based on the received fifth indication, determine a group of AFDM parameters in the one AFDM parameter set as the target AFDM parameters.

[0235] Optionally, each group of AFDM parameters in the AFDM parameter set further includes at least one of the following:

[0236] The number of time domain sampling points of an AFDM symbol;

[0237] The absolute time interval of the time domain sampling points;

[0238] The absolute time length of the chip;

[0239] Number of subcarriers;

[0240] The bandwidth occupied by the AFDM signal;

[0241] Subcarrier spacing;

[0242] AFDM symbol length;

[0243] The index of the subcarrier used by the AFDM symbol;

[0244] CPP length of AFDM symbol.

[0245] Optionally, when the communication device is a transmitting end, the parameter determination device 70 further includes:

[0246] A first sending module, configured to send a plurality of AFDM reference signals to a receiving end on a plurality of orthogonal resources based on a plurality of groups of AFDM parameters;

[0247] A first receiving module, configured to receive first feedback information from the receiving end; the first feedback information is used to indicate a first target group of AFDM parameters selected from the multiple groups of AFDM parameters;

[0248] The second sending module is used to send a sixth indication to the receiving end according to the first target group AFDM parameters, and the sixth indication is used to indicate the AFDM parameters used by the sending end to send AFDM signals subsequently.

[0249] Optionally, when the communication device is a receiving end, the parameter determination device 70 further includes:

[0250] A second receiving module, configured to receive, on a plurality of orthogonal resources, a plurality of AFDM reference signals sent by a transmitting end, wherein the plurality of AFDM reference signals are sent based on a plurality of groups of AFDM parameters;

[0251] A third sending module, configured to send first feedback information to the sending end, wherein the first feedback information is used to indicate a first target group of AFDM parameters selected from the multiple groups of AFDM parameters;

[0252] The third receiving module is used to receive the sixth indication sent by the transmitting end; the sixth indication is determined according to the AFDM parameters of the first target group, and is used to indicate the AFDM parameters used by the transmitting end to subsequently send the AFDM signal.

[0253] Optionally, the first target group AFDM parameters are determined based on constraints and reception conditions of the multiple AFDM reference signals.

[0254] Optionally, the multiple groups of AFDM parameters satisfy at least one of the following:

[0255] pre-agreed;

[0256] Based on signaling instructions;

[0257] Selected from a pre-agreed or indicated set of AFDM parameters.

[0258] Optionally, the multiple orthogonal resources satisfy at least one of the following:

[0259] They are orthogonal resources in the time domain;

[0260] In the frequency domain, they are orthogonal resources;

[0261] They are orthogonal resources in the code domain.

[0262] Optionally, when the communication device is a transmitting end, the parameter determination device 70 further includes:

[0263] a fourth sending module, configured to send a corresponding AFDM reference signal to a receiving end based on at least one set of AFDM parameters whose difference from the AFDM parameters in use is less than or equal to a threshold;

[0264] A fourth receiving module, configured to receive second feedback information from the receiving end; the second feedback information is used to indicate a second target group of AFDM parameters selected from the at least one group of AFDM parameters;

[0265] The fifth sending module is used to send a seventh indication to the receiving end according to the AFDM parameters of the second target group, and the seventh indication is used to indicate the AFDM parameters used by the sending end to send the AFDM signal subsequently.

[0266] Optionally, when the communication device is a receiving end, the parameter determination device 70 further includes:

[0267] a fifth receiving module, configured to receive an AFDM reference signal sent by a transmitting end, wherein the AFDM reference signal is sent based on at least one set of AFDM parameters whose difference from the AFDM parameters being used is less than or equal to a threshold;

[0268] a sixth sending module, configured to send second feedback information to the sending end, wherein the second feedback information is used to indicate a second target group of AFDM parameters selected from the at least one group of AFDM parameters;

[0269] The sixth receiving module is used to receive the seventh indication sent by the transmitting end; the seventh indication is determined according to the AFDM parameters of the second target group, and is used to indicate the AFDM parameters used by the transmitting end to subsequently send the AFDM signal.

[0270] Optionally, the second target group AFDM parameters are determined based on constraints and the reception status of the AFDM reference signal.

[0271] Optionally, the constraint condition is related to at least one of the following:

[0272] Communication quality, the communication quality including at least one of the following: communication delay, communication rate, useful signal strength, interference signal strength, usage of coexisting systems, and channel resolution;

[0273] Perceptual quality, the perceptual quality comprising at least one of the following: channel resolution, maximum unambiguous speed;

[0274] Self-constraint information, wherein the self-constraint information includes at least one of the following: maximum bandwidth, maximum sampling rate, minimum sampling time interval, and maximum symbol length.

[0275] The parameter determination device 70 provided in the embodiment of the present application can achieve Figure 5 The various processes implemented by the method embodiment and achieving the same technical effect are not described here to avoid repetition.

[0276] like Figure 8 As shown, an embodiment of the present application also provides a communication device 800, including a processor 801 and a memory 802, and the memory 802 stores a program or instruction that can be executed on the processor 801. When the program or instruction is executed by the processor 801, the various steps of the above-mentioned parameter determination method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0277] The embodiment of the present application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the following Figure 5 The steps in the method embodiment shown. This terminal embodiment corresponds to the above method embodiment, and each implementation process and implementation mode of the above method embodiment can be applied to this terminal embodiment and can achieve the same technical effect.

[0278] Specifically, Fig. 9 A schematic diagram of the hardware structure of a terminal for implementing an embodiment of the present application.

[0279] The terminal 900 includes but is not limited to: a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909 and at least some of the components of a processor 910.

[0280] Those skilled in the art will appreciate that the terminal 900 may also include a power source (such as a battery) for supplying power to various components, and the power source may be logically connected to the processor 910 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Fig. 9 The terminal structure shown in the figure does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0281] It should be understood that in the embodiment of the present application, the input unit 904 may include a graphics processing unit (GPU) 9041 and a microphone 9042, and the graphics processor 9041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 906 may include a display panel 9061, and the display panel 9061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 907 includes a touch panel 9071 and at least one of other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include two parts: a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0282] In the embodiment of the present application, after receiving downlink data from the network side device, the RF unit 901 can transmit the data to the processor 910 for processing; in addition, the RF unit 901 can send uplink data to the network side device. Generally, the RF unit 901 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0283] The memory 909 can be used to store software programs or instructions and various data. The memory 909 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 909 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 909 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0284] The processor 910 may include one or more processing units; optionally, the processor 910 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 910.

[0285] The processor 910 is used to obtain an AFDM parameter set; and determine target AFDM parameters according to the AFDM parameter set.

[0286] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the above-mentioned method embodiment, and achieve the same or corresponding technical effect. To avoid repetition, it will not be repeated here.

[0287] The embodiment of the present application also provides a network side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the following Figure 5 The steps of the method embodiment shown. The network side device embodiment corresponds to the above method embodiment, and each implementation process and implementation mode of the above method embodiment can be applied to the network side device embodiment and can achieve the same technical effect.

[0288] Specifically, the embodiment of the present application also provides a network side device. Fig.10 As shown, the network side device 100 includes: an antenna 101, a radio frequency device 102, a baseband device 103, a processor 104 and a memory 105. The antenna 101 is connected to the radio frequency device 102. In the uplink direction, the radio frequency device 102 receives information through the antenna 101 and sends the received information to the baseband device 103 for processing. In the downlink direction, the baseband device 103 processes the information to be sent and sends it to the radio frequency device 102. The radio frequency device 102 processes the received information and sends it out through the antenna 101.

[0289] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 103, which includes a baseband processor.

[0290] The baseband device 103 may include, for example, at least one baseband board on which a plurality of chips are arranged. Fig.10 As shown, one of the chips is, for example, a baseband processor, which is connected to the memory 105 through a bus interface to call the program in the memory 105 to execute the network device operations shown in the above method embodiment.

[0291] The network side device may further include a network interface 106, which is, for example, a Common Public Radio Interface (CPRI).

[0292] Specifically, the network side device 100 of the embodiment of the present application further includes: instructions or programs stored in the memory 105 and executable on the processor 104, and the processor 104 calls the instructions or programs in the memory 105 to execute Figure 7 The methods executed by the modules shown achieve the same technical effects, and therefore will not be described here in detail to avoid repetition.

[0293] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the above-mentioned parameter determination method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0294] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0295] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned parameter determination method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0296] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0297] The embodiments of the present application further provide a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the above-mentioned parameter determination method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0298] An embodiment of the present application further provides a communication system, including: a terminal and a network-side device, wherein the terminal and the network-side device can be used to execute the steps of the parameter determination method as described above.

[0299] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0300] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general hardware platform, and of course, can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, disk, CD, etc.), including several instructions to enable a terminal or a network-side device to execute the methods described in each embodiment of the present application.

[0301] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of the present application and the scope of protection of the claims, and these implementation methods are all within the protection of the present application.

Claims

1. A parameter determination method, characterized in that: include: The communication device obtains an AFDM parameter set; The communication device determines target AFDM parameters according to the AFDM parameter set.

2. The method according to claim 1, characterized in that Each group of AFDM parameters in the AFDM parameter set includes at least one of the following: The amount by which the frequency of each subcarrier changes over time; The phase offset of each subcarrier.

3. The method according to claim 1, characterized in that The method further comprises: The communication device acquires first information, where the first information is used to configure or indicate at least one of the following in AFDM transmission: a frequency variation of each subcarrier over time, and a phase offset of each subcarrier; The communication device determines at least one of the following items in AFDM transmission based on the first information: a frequency change of each subcarrier over time and a phase offset of each subcarrier.

4. The method according to any one of claims 1 to 3, characterized in that: The communication device obtains an AFDM parameter set, including: The communication device determines an AFDM parameter set based on a pre-agreed agreement or a received first indication; The communication device determines the target AFDM parameters according to the AFDM parameter set, including: The communication device determines a group of AFDM parameters in the one AFDM parameter set as the target AFDM parameters; or, The communication device determines a group of AFDM parameters in the one AFDM parameter set as the target AFDM parameters based on the received second indication.

5. The method according to any one of claims 1 to 3, characterized in that: The communication device obtains an AFDM parameter set, including: The communication device determines a plurality of AFDM parameter sets based on a pre-agreed or received third indication; The communication device determines, based on the received fourth indication, an AFDM parameter set from the plurality of AFDM parameter sets; The communication device determines the target AFDM parameters according to the AFDM parameter set, including: The communication device determines a group of AFDM parameters in the one AFDM parameter set as the target AFDM parameters; or, The communication device determines, based on the received fifth indication, a group of AFDM parameters in the one AFDM parameter set as the target AFDM parameters.

6. The method according to any one of claims 1 to 5, characterized in that: Each group of AFDM parameters in the AFDM parameter set also includes at least one of the following: The number of time domain sampling points of an AFDM symbol; The absolute time interval of the time domain sampling points; The absolute time length of the chip; Number of subcarriers; The bandwidth occupied by the AFDM signal; Subcarrier spacing; AFDM symbol length; The index of the subcarrier used by the AFDM symbol; Chirp cyclic prefix CPP length of AFDM symbol.

7. The method according to any one of claims 1 to 6, characterized in that: When the communication device is a transmitting end, the method further includes: The transmitting end sends a plurality of AFDM reference signals to the receiving end on a plurality of orthogonal resources based on a plurality of groups of AFDM parameters; The transmitting end receives first feedback information from the receiving end; wherein the first feedback information is used to indicate a first target group AFDM parameter selected from the multiple groups of AFDM parameters; The transmitting end sends a sixth indication to the receiving end according to the first target group AFDM parameters, where the sixth indication is used to indicate the AFDM parameters used by the transmitting end to subsequently send AFDM signals.

8. The method according to any one of claims 1 to 6, characterized in that: When the communication device is a receiving end, the method further includes: The receiving end receives a plurality of AFDM reference signals sent by the transmitting end on a plurality of orthogonal resources respectively, wherein the plurality of AFDM reference signals are sent based on a plurality of groups of AFDM parameters; The receiving end sends first feedback information to the transmitting end, wherein the first feedback information is used to indicate a first target group of AFDM parameters selected from the multiple groups of AFDM parameters; The receiving end receives a sixth indication sent by the transmitting end; wherein the sixth indication is determined based on the AFDM parameters of the first target group, and is used to indicate the AFDM parameters used by the transmitting end to subsequently send an AFDM signal.

9. The method according to claim 7 or 8, characterized in that: The first target group AFDM parameters are determined according to constraint conditions and reception conditions of the multiple AFDM reference signals.

10. The method according to claim 7 or 8, characterized in that: The multiple groups of AFDM parameters satisfy at least one of the following: pre-agreed; Based on signaling instructions; Selected from a pre-agreed or indicated set of AFDM parameters.

11. The method according to any one of claims 7 to 10, characterized in that: The multiple orthogonal resources satisfy at least one of the following: They are orthogonal resources in the time domain; In the frequency domain, they are orthogonal resources; They are orthogonal resources in the code domain.

12. The method according to any one of claims 1 to 6, characterized in that: When the communication device is a transmitting end, the method further includes: The transmitting end sends a corresponding AFDM reference signal to the receiving end based on at least one set of AFDM parameters whose difference from the AFDM parameters being used is less than or equal to a threshold; The transmitting end receives second feedback information from the receiving end; wherein the second feedback information is used to indicate a second target group of AFDM parameters selected from the at least one group of AFDM parameters; The transmitting end sends a seventh indication to the receiving end according to the second target group AFDM parameters, where the seventh indication is used to indicate the AFDM parameters used by the transmitting end to subsequently send AFDM signals.

13. The method according to any one of claims 1 to 6, characterized in that: When the communication device is a receiving end, the method further includes: The receiving end receives an AFDM reference signal sent by the transmitting end, wherein the AFDM reference signal is sent based on at least one set of AFDM parameters whose difference from the AFDM parameters being used is less than or equal to a threshold; The receiving end sends second feedback information to the transmitting end, wherein the second feedback information is used to indicate a second target group of AFDM parameters selected from the at least one group of AFDM parameters; The receiving end receives the seventh indication sent by the transmitting end; wherein the seventh indication is determined according to the AFDM parameters of the second target group, and is used to indicate the AFDM parameters used by the transmitting end to subsequently send the AFDM signal.

14. The method according to claim 12 or 13, characterized in that The second target group AFDM parameters are determined according to constraint conditions and a reception condition of the AFDM reference signal.

15. The method according to claim 9 or 14, characterized in that: The constraint is related to at least one of the following: Communication quality, the communication quality including at least one of the following: communication delay, communication rate, useful signal strength, interference signal strength, usage of coexisting systems, and channel resolution; Perceptual quality, the perceptual quality comprising at least one of the following: channel resolution, maximum unambiguous speed; Self-constraint information, wherein the self-constraint information includes at least one of the following: maximum bandwidth, maximum sampling rate, minimum sampling time interval, and maximum symbol length.

16. A parameter determination device, characterized in that: An acquisition module, used for acquiring an AFDM parameter set; A determination module is used to determine target AFDM parameters according to the AFDM parameter set.

17. A communication device, characterized in that: The method comprises a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the parameter determination method according to any one of claims 1 to 15 are implemented.

18. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the parameter determination method according to any one of claims 1 to 15 are implemented.

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