Signal transmission method, communication apparatus, storage medium, and program product

Abstract

The present application provides a signal transmission method, a communication apparatus, a storage medium, and a program product. The method comprises: receiving first configuration information, the first configuration information being used to configure the relationship between the bandwidth of a first signal and the bandwidth of a second signal, the bandwidth of the first signal being greater than the bandwidth of the second signal, and the first signal being a signal generated by a first communication apparatus by means of transform precoding; and, on the basis of the first configuration information, sending a second signal. An equivalent amount of data is transmitted by using less bandwidth, thus helping to improve spectral efficiency. In addition, the first signal is generated by means of transform precoding, helping to ensure the coverage of the signal.

Description

Signal transmission methods, communication devices, storage media and software products

[0001] This application claims priority to Chinese Patent Application No. 202411564818.6, filed on November 4, 2024, entitled “Signal Transmission Method, Communication Apparatus, Storage Medium and Program Product”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communications, and particularly to signal transmission methods, communication devices, storage media, and program products in the field of communications. Background Technology

[0003] Orthogonal frequency division multiplexing (OFDM) is a multi-carrier modulation technique widely used in wireless communication systems. Using OFDM waveforms to carry signals can improve spectral efficiency, but OFDM waveforms have a high peak-to-average power ratio (PAPR), resulting in significant power back-off from the power amplifier (PA), leading to lower transmit power and thus a smaller coverage area. In contrast, discrete fourier transform spreading OFDM (DFT-s-OFDM) waveforms undergo transform precoding before subcarrier mapping, resulting in a lower PAPR than OFDM waveforms and thus improving signal coverage.

[0004] If a low- to mid-order modulation method, such as binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), or 16-quadrature amplitude modulation (16-QAM), is used to generate a signal based on transform precoding, the spectral efficiency may be low because each symbol represents a small number of data bits. Summary of the Invention

[0005] This application provides signal transmission methods, communication devices, storage media, and program products, with the aim of improving spectrum efficiency while ensuring coverage.

[0006] Firstly, this application provides a signal transmission method, which can be executed by a first communication device. The first communication device can be a terminal device, or a circuit or chip applicable to the terminal device (such as a modem chip, also known as a baseband chip, or a system-on-chip (SoC) chip or system-in-package (SIP) chip containing a modem core), and this application does not limit it in this regard.

[0007] For example, the method includes: receiving first configuration information, the first configuration information being used to configure the relationship between the bandwidth of a first signal and the bandwidth of a second signal, wherein the bandwidth of the first signal is greater than the bandwidth of the second signal, and the first signal is a signal generated by a first communication device via transformation precoding; and transmitting the second signal based on the first configuration information.

[0008] It can be understood that the second signal is included in the first signal, or that the second signal is a part of the first signal.

[0009] In the above signal transmission method, the first communication device can transmit a portion of the generated first signal (i.e., the second signal) based on the relationship between the bandwidth of the configured first signal and the bandwidth of the second signal. This allows the second communication device to recover the first signal from the second signal. In other words, an equivalent amount of data is transmitted using less bandwidth, which helps improve spectral efficiency. Furthermore, the first signal is generated through transform precoding, which helps ensure signal coverage. Therefore, the above signal transmission method helps improve spectral efficiency while ensuring coverage.

[0010] In conjunction with the first aspect, in some embodiments of the first aspect, the relationship between the bandwidth of the first signal and the bandwidth of the second signal includes any one of the following: the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of the bandwidth of the second signal to the bandwidth of the first signal; the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of half the bandwidth of the second signal to the bandwidth of the first signal; or, the difference between the bandwidth of the first signal and the bandwidth of the second signal, wherein the filtered signal is a signal in the first signal other than the second signal.

[0011] In other words, the aforementioned first configuration information can indicate (or configure) the relationship between the bandwidth of the first signal and the bandwidth of the second signal based on any of the above-mentioned options. This allows the first communication device to filter out a portion of the signal in the first signal based on the aforementioned first configuration information, thereby obtaining and transmitting the second signal. This achieves the transmission of an equivalent amount of data using less bandwidth, contributing to improved spectral efficiency. Furthermore, providing multiple configuration methods for the relationship between the bandwidth of the first signal and the bandwidth of the second signal enhances configuration flexibility.

[0012] In conjunction with the first aspect, in some embodiments of the first aspect, the aforementioned first configuration information is further used to configure at least one of the following: scheduling bandwidth, transmission bandwidth, modulation and coding scheme (MCS), filter type, or filter tap coefficients.

[0013] By properly configuring scheduling bandwidth and transmission bandwidth, it is possible to optimize the use of spectrum resources and adapt to the needs of different users. Properly configuring the MCS (Multi-Side Controller) helps improve signal transmission rate and reliability. Properly configuring filter types and filter tap coefficients helps reduce interference, lower latency, and improve communication quality.

[0014] In one possible implementation, the aforementioned scheduling bandwidth is the bandwidth allocated to the first communication device; the aforementioned transmission bandwidth is the bandwidth used when transmitting the second signal.

[0015] Optionally, the scheduling bandwidth and transmission bandwidth described above are characterized by the number of physical resource blocks (PRBs) or the transport block size (TBS). This application does not limit this. The scheduling bandwidth and transmission bandwidth described above can also be characterized by other parameters, such as the number of modulation symbols.

[0016] In conjunction with the first aspect, in some embodiments of the first aspect, the aforementioned MCS is indicated based on an MCS index, which is an item in a first correspondence. The first correspondence is used to indicate the correspondence between multiple MCS indices, multiple code rates, and multiple spectral efficiencies under the π / 2-BPSK modulation scheme. The multiple code rates include at least one of the code rate corresponding to the first signal and the code rate corresponding to the second signal, and the multiple spectral efficiencies include at least one of the spectral efficiency corresponding to the first signal and the spectral efficiency corresponding to the second signal.

[0017] In this way, indicating the MCS through the MCS index helps to reduce the number of information bits transmitted, thereby reducing signaling overhead.

[0018] In conjunction with the first aspect, in some embodiments of the first aspect, the method further includes: receiving first indication information, the first indication information being used to instruct the first communication device to determine the MCS based on a first correspondence.

[0019] In other words, the first communication device can determine the MCS based on the first indication information and the aforementioned MCS index and the first correspondence relationship. This prevents the first communication device from using an incorrect correspondence relationship, thus improving the accuracy of the determined MCS. However, the above method should not be construed as limiting this application. In another implementation, the first communication device can also determine the MCS based on a preset rule and the first correspondence relationship. For example, the preset rule could be that when the first configuration information configures the relationship between the bandwidth of the first signal and the bandwidth of the second signal, and the bandwidth of the first signal is greater than the bandwidth of the second signal, the first communication device determines the MCS based on the aforementioned first correspondence relationship. This helps reduce signaling overhead.

[0020] In conjunction with the first aspect, in some embodiments of the first aspect, the filter type and filter tap coefficients are based on a filter index indication, which is an item in a second correspondence indicating a correspondence between at least one filter index, at least one filter type, and at least one filter tap coefficient.

[0021] Using filter indexes to indicate filter type and filter tap coefficients helps reduce the number of transmitted information bits, thereby reducing signaling overhead.

[0022] In conjunction with the first aspect, in some embodiments of the first aspect, the method further includes: transmitting capability information, which indicates at least one of the following: first information, a supported maximum scheduling bandwidth, a supported maximum transmission bandwidth, a supported spectral efficiency range, or a supported filter frequency range, wherein the first information indicates the relationship between the bandwidth of a first signal and the bandwidth of a second signal supported by the first communication device.

[0023] By reporting the aforementioned capability information, the second communication device can, within the capability range of the first communication device, reasonably configure parameters such as the relationship between the bandwidth of the first signal and the bandwidth of the second signal.

[0024] In one possible implementation, the first information can correspond one-to-one with the maximum supported scheduling bandwidth, the maximum supported transmission bandwidth, the supported spectral efficiency range, or the supported filter frequency range. That is, the first communication device can directly report the first information, or it can report the maximum supported scheduling bandwidth, the maximum supported transmission bandwidth, the supported spectral efficiency range, or the supported filter frequency range, so that the second communication device can determine the first information based on the above parameters.

[0025] In conjunction with the first aspect, in some embodiments of the first aspect, the method further includes: receiving fourth indication information, the fourth indication information being used to instruct the first communication device to transmit a signal using a first transmission mode, wherein the first transmission mode is a mode in which the bandwidth of the second signal is less than the bandwidth of the first signal.

[0026] In other words, the first communication device determines to use the first transmission mode when transmitting signals based on the aforementioned fourth indication information, but this should not constitute any limitation on this application. In one implementation, the first communication device may also determine to use the first transmission mode based on a preset rule. For example, the preset rule may be that when the first configuration information configures the relationship between the bandwidth of the first signal and the bandwidth of the second signal, and the bandwidth of the first signal is greater than the bandwidth of the second signal, the first communication device uses the aforementioned first transmission mode to transmit signals, which helps to reduce signaling overhead.

[0027] Secondly, this application provides another signal transmission method, the method comprising: sending first configuration information, the first configuration information being used to configure the relationship between the bandwidth of a first signal and the bandwidth of a second signal, wherein the bandwidth of the first signal is greater than the bandwidth of the second signal, and the first signal is a signal generated by a first communication device via transformation precoding; and receiving the second signal based on the aforementioned first configuration information.

[0028] In one possible implementation, the method is performed by a second communication device. The second communication device may be a network device, or a circuit or chip applicable to a network device, etc., and this application does not limit its scope.

[0029] In conjunction with the second aspect, in some embodiments of the second aspect, the relationship between the bandwidth of the first signal and the bandwidth of the second signal includes any one of the following: the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of the bandwidth of the second signal to the bandwidth of the first signal; the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of half the bandwidth of the second signal to the bandwidth of the first signal; or, the difference between the bandwidth of the first signal and the bandwidth of the second signal, wherein the filtered signal is a signal in the first signal other than the second signal.

[0030] In conjunction with the second aspect, in some embodiments of the second aspect, the aforementioned first configuration information is also used to configure at least one of the following: scheduling bandwidth, transmission bandwidth, MCS, filter type, or filter tap coefficients.

[0031] In one possible implementation, the aforementioned scheduling bandwidth is the bandwidth allocated to the first communication device; the aforementioned transmission bandwidth is the bandwidth used when transmitting the second signal.

[0032] In one possible implementation, the aforementioned scheduling bandwidth and transmission bandwidth are characterized by the number of PRBs or TBSs.

[0033] In conjunction with the second aspect, in some embodiments of the second aspect, the aforementioned MCS is indicated based on an MCS index, which is an item in a first correspondence. The first correspondence is used to indicate the correspondence between multiple MCS indices, multiple code rates, and multiple spectral efficiencies under the π / 2-BPSK modulation scheme. The multiple code rates include at least one of the code rate corresponding to the first signal and the code rate corresponding to the second signal, and the multiple spectral efficiencies include at least one of the spectral efficiency corresponding to the first signal and the spectral efficiency corresponding to the second signal.

[0034] In conjunction with the second aspect, in some embodiments of the second aspect, the above method further includes: sending first indication information, the first indication information being used to instruct the first communication device to determine the MCS based on the first correspondence.

[0035] In conjunction with the second aspect, in some embodiments of the second aspect, the filter type and filter tap coefficients are based on a filter index indication, which is one of a second correspondence indicating a correspondence between at least one filter index, at least one filter type, and at least one filter tap coefficient.

[0036] In conjunction with the second aspect, in some embodiments of the second aspect, the method further includes: receiving capability information, which is used to indicate at least one of the following: first information, a supported maximum scheduling bandwidth, a supported maximum transmission bandwidth, a supported spectral efficiency range, or a supported filter frequency range, wherein the first information is used to indicate the relationship between the bandwidth of a first signal and the bandwidth of a second signal supported by the first communication device.

[0037] In conjunction with the second aspect, in some embodiments of the second aspect, the above method further includes: sending fourth indication information, the fourth indication information being used to instruct the first communication device to send a signal using a first transmission mode, the first transmission mode being a mode in which the bandwidth of the second signal is less than the bandwidth of the first signal.

[0038] Thirdly, this application provides yet another signal transmission method, which can be executed by a first communication device. The first communication device can be a terminal device, or a circuit or chip applicable to a terminal device (such as a modem chip, also known as a baseband chip, or a SoC chip or SIP chip containing a modem core), and this application does not limit it in this regard.

[0039] For example, the method includes: receiving a plurality of first configuration information, each first configuration information being used to configure a relationship between the bandwidth of a first signal and the bandwidth of a second signal, wherein the bandwidth of the first signal is greater than the bandwidth of the second signal; sending second indication information and a plurality of second signals, the second indication information indicating a plurality of output power back-off (OBO), the plurality of output power back-off amounts being the power required to be backed up when sending the plurality of second signals based on the plurality of first configuration information, wherein the plurality of output power back-off amounts correspond one-to-one with the plurality of first configuration information, and the spectral efficiency corresponding to the plurality of output power back-off amounts is the same.

[0040] The aforementioned multiple output power back-off amounts correspond one-to-one with the aforementioned multiple first configuration information. This can be understood as a one-to-one correspondence between the aforementioned multiple output power back-off amounts and the bandwidths of various first and second signals. For example, this relationship can be characterized by a truncation ratio, thus the aforementioned multiple output power back-off amounts correspond one-to-one with multiple truncation ratios. It can be understood that the signal coverage is related to the output power back-off amount (specifically, the output power back-off amount). By reporting multiple output power back-off amounts under the same spectral efficiency, the second communication device can determine the optimal relationship between the bandwidth of the first signal and the bandwidth of the second signal under the aforementioned spectral efficiency based on the aforementioned multiple output power back-off amounts, thereby improving the coverage. For example, if the relationship between the bandwidth of the first signal and the bandwidth of the second signal is characterized by a truncation ratio, then by reporting multiple output power back-off amounts under the same spectral efficiency, the second communication device can determine the optimal truncation ratio under the aforementioned spectral efficiency based on the aforementioned multiple output power back-off amounts. That is, based on which truncation ratio is the first signal truncated (or filtered), the coverage of the resulting second signal is larger.

[0041] In conjunction with the third aspect, in certain embodiments of the third aspect, the relationship between the bandwidth of the first signal and the bandwidth of the second signal includes any one of the following: the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of the bandwidth of the second signal to the bandwidth of the first signal; the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of half the bandwidth of the second signal to the bandwidth of the first signal; or, the difference between the bandwidth of the first signal and the bandwidth of the second signal, wherein the filtered signal is a signal in the first signal other than the second signal.

[0042] In conjunction with the third aspect, in some embodiments of the third aspect, the first configuration information is also used to configure at least one of the following: scheduling bandwidth, transmission bandwidth, MCS, filter type, or filter tap coefficients.

[0043] In one possible implementation, the aforementioned scheduling bandwidth is the bandwidth allocated to the first communication device; the aforementioned transmission bandwidth is the bandwidth used when transmitting the second signal.

[0044] Optionally, the scheduling bandwidth and transmission bandwidth described above are characterized by the number of PRBs or TBS. This application does not limit this. The scheduling bandwidth and transmission bandwidth described above can also be characterized by other parameters, such as the number of modulation symbols.

[0045] In conjunction with the third aspect, in some embodiments of the third aspect, the aforementioned MCS is indicated based on an MCS index, which is an item in a first correspondence. The first correspondence is used to indicate the correspondence between multiple MCS indices, multiple code rates, and multiple spectral efficiencies under the π / 2-BPSK modulation scheme. The multiple code rates include at least one of the code rate corresponding to the first signal and the code rate corresponding to the second signal, and the multiple spectral efficiencies include at least one of the spectral efficiency corresponding to the first signal and the spectral efficiency corresponding to the second signal.

[0046] In conjunction with the third aspect, in some embodiments of the third aspect, the above method further includes: receiving first indication information, the first indication information being used to instruct the first communication device to determine the MCS based on a first correspondence.

[0047] In conjunction with the third aspect, in some embodiments of the third aspect, the filter type and filter tap coefficients are based on a filter index indication, which is an item in a second correspondence indicating a correspondence between at least one filter index, at least one filter type, and at least one filter tap coefficient.

[0048] In conjunction with the third aspect, in some embodiments of the third aspect, the method further includes: transmitting capability information, which indicates at least one of the following: first information, a supported maximum scheduling bandwidth, a supported maximum transmission bandwidth, a supported spectral efficiency range, or a supported filter frequency range, wherein the first information indicates the relationship between the bandwidth of a first signal and the bandwidth of a second signal supported by the first communication device.

[0049] In conjunction with the third aspect, in some embodiments of the third aspect, the method further includes: receiving third indication information, the third indication information indicating one or more radio frequency performance indicators, the one or more radio frequency performance indicators being used to determine the at least one output power back-off amount.

[0050] In conjunction with the third aspect, in some embodiments of the third aspect, the method further includes: receiving fourth indication information, the fourth indication information being used to instruct the first communication device to transmit a signal using a first transmission mode, wherein the first transmission mode is a mode in which the bandwidth of the second signal is less than the bandwidth of the first signal.

[0051] Fourthly, this application provides another signal transmission method, the method comprising: transmitting a plurality of first configuration information, each first configuration information being used to configure the relationship between the bandwidth of a first signal and the bandwidth of a second signal, wherein the bandwidth of the first signal is greater than the bandwidth of the second signal; receiving second indication information and a plurality of second signals, the second indication information indicating a plurality of OBOs, the plurality of output power back-off amounts being the power required to back off when transmitting the plurality of second signals based on the plurality of first configuration information, wherein the plurality of output power back-off amounts correspond one-to-one with the plurality of first configuration information, and the spectral efficiency corresponding to the plurality of output power back-off amounts is the same.

[0052] In one possible implementation, the method is performed by a second communication device. The second communication device may be a network device, or a circuit or chip applicable to a network device, etc., and this application does not limit its scope.

[0053] In conjunction with the fourth aspect, in certain embodiments of the fourth aspect, the relationship between the bandwidth of the first signal and the bandwidth of the second signal includes any one of the following: the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of the bandwidth of the second signal to the bandwidth of the first signal; the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of half the bandwidth of the second signal to the bandwidth of the first signal; or, the difference between the bandwidth of the first signal and the bandwidth of the second signal, wherein the filtered signal is a signal in the first signal other than the second signal.

[0054] In conjunction with the fourth aspect, in some embodiments of the fourth aspect, the first configuration information described above is also used to configure at least one of the following: scheduling bandwidth, transmission bandwidth, MCS, filter type, or filter tap coefficients.

[0055] In one possible implementation, the aforementioned scheduling bandwidth is the bandwidth allocated to the first communication device; the aforementioned transmission bandwidth is the bandwidth used when transmitting the second signal.

[0056] In one possible implementation, the aforementioned scheduling bandwidth and transmission bandwidth are characterized by the number of PRBs or TBSs.

[0057] In conjunction with the fourth aspect, in some embodiments of the fourth aspect, the aforementioned MCS is indicated based on an MCS index, which is an item in a first correspondence. The first correspondence is used to indicate the correspondence between multiple MCS indices, multiple code rates, and multiple spectral efficiencies under the π / 2-BPSK modulation scheme. The multiple code rates include at least one of the code rate corresponding to the first signal and the code rate corresponding to the second signal, and the multiple spectral efficiencies include at least one of the spectral efficiency corresponding to the first signal and the spectral efficiency corresponding to the second signal.

[0058] In conjunction with the fourth aspect, in some embodiments of the fourth aspect, the above method further includes: sending first indication information, the first indication information being used to instruct the first communication device to determine the MCS based on the first correspondence.

[0059] In conjunction with the fourth aspect, in some embodiments of the fourth aspect, the filter type and filter tap coefficients are based on a filter index indication, which is an item in a second correspondence indicating a correspondence between at least one filter index, at least one filter type, and at least one filter tap coefficient.

[0060] In conjunction with the fourth aspect, in some embodiments of the fourth aspect, the method further includes: receiving capability information, which is used to indicate at least one of the following: first information, a supported maximum scheduling bandwidth, a supported maximum transmission bandwidth, a supported spectral efficiency range, or a supported filter frequency range, wherein the first information is used to indicate the relationship between the bandwidth of a first signal and the bandwidth of a second signal supported by the first communication device.

[0061] In conjunction with the fourth aspect, in some embodiments of the fourth aspect, the method further includes: sending third indication information, the third indication information indicating one or more radio frequency performance indicators, the one or more radio frequency performance indicators being used to determine the plurality of output power back-off amounts.

[0062] In conjunction with the fourth aspect, in some embodiments of the fourth aspect, the method further includes: sending fourth indication information, the fourth indication information being used to instruct the first communication device to send a signal using a first transmission mode, the first transmission mode being a mode in which the bandwidth of the second signal is less than the bandwidth of the first signal.

[0063] Fifthly, this application provides a communication apparatus for executing the methods in the first to fourth aspects and any possible implementations of the first to fourth aspects described above. Specifically, the communication apparatus includes a module for executing the methods in any possible implementations of the first to fourth aspects described above.

[0064] Sixthly, this application provides another communication device, including a processor coupled to a memory, which can be used to execute instructions in the memory to implement the methods in the first to fourth aspects and any possible implementations of the first to fourth aspects. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, to which the processor is coupled.

[0065] In one implementation, the communication device is a terminal device or a network device. When the communication device is a terminal device or a network device, the communication interface can be a transceiver, or an input / output interface.

[0066] In another implementation, the communication device is a chip applicable to terminal devices or network devices. When the communication device is a chip applicable to terminal devices or network devices, the aforementioned communication interface can be an input / output interface.

[0067] A seventh aspect provides a processor, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive signals through the input circuit and transmit signals through the output circuit, causing the processor to execute the methods described in the first to fourth aspects and any possible implementation thereof.

[0068] In the specific implementation process, the processor can be a chip, the input circuit can be an input pin, the output circuit can be an output pin, and the processing circuit can be a transistor, gate circuit, flip-flop, and various logic circuits. The input signal received by the input circuit can be received and input by, for example, but not limited to, a receiver, and the signal output by the output circuit can be, for example, but not limited to, output to a transmitter and transmitted by the transmitter. Furthermore, the input circuit and the output circuit can be the same circuit, which is used as the input circuit and the output circuit at different times. This application does not limit the specific implementation method of the processor and various circuits.

[0069] Eighthly, a communication device is provided, including a processor and a memory. The processor is configured to read instructions stored in the memory, receive signals via a receiver, and transmit signals via a transmitter to execute the methods described in the first to fourth aspects and any possible implementation thereof.

[0070] Optionally, the processor may be one or more, and the memory may be one or more.

[0071] Optionally, the memory may be integrated with the processor, or the memory may be separated from the processor.

[0072] In the specific implementation process, the memory can be a non-transitory memory, such as read-only memory (ROM), which can be integrated with the processor on the same chip or set on different chips. This application does not limit the type of memory or the way the memory and processor are set.

[0073] It should be understood that related data interaction processes, such as sending configuration information, can be a process of outputting configuration information from the processor, and receiving configuration information can be a process of the processor receiving input configuration information. Specifically, the processed output data can be output to the transmitter, and the input data received by the processor can come from the receiver. Here, the transmitter and receiver can be collectively referred to as a transceiver.

[0074] The communication device in the eighth aspect above can be a chip. The processor can be implemented in hardware or software. When implemented in hardware, the processor can be a logic circuit, integrated circuit, etc. When implemented in software, the processor can be a general-purpose processor that reads software code stored in memory. The memory can be integrated into the processor or located outside the processor and exist independently.

[0075] Ninthly, a computer program product is provided, the computer program product comprising: a computer program (also referred to as code or instructions), which, when the computer program is run, causes a computer to perform the methods of the first to fourth aspects and any possible implementation thereof.

[0076] In a tenth aspect, a computer-readable storage medium is provided that stores a computer program (also referred to as code or instructions) that, when executed on a computer, causes the computer to perform the methods described in the first to fourth aspects and any possible implementation thereof. Attached Figure Description

[0077] Figure 1 is a schematic diagram of the transmission process of a frequency division spread spectrum (FDSS) transmitter;

[0078] Figure 2 is a schematic diagram of PAPR with different waveforms;

[0079] Figure 3 is a schematic diagram of a communication system applied in an embodiment of this application;

[0080] Figure 4 is a flowchart illustrating the signal transmission method provided in an embodiment of this application;

[0081] Figure 5 is a schematic diagram showing the relationship between the bandwidth of the first signal and the bandwidth of the second signal provided in the embodiments of this application;

[0082] Figure 6 is a schematic diagram of the scheduling bandwidth and transmission bandwidth provided in an embodiment of this application;

[0083] Figure 7 is a schematic diagram of the process of a transmitter sending a second signal according to an embodiment of this application;

[0084] Figure 8 is a schematic diagram of the receiver receiving the second signal according to an embodiment of this application;

[0085] Figure 9 is another flowchart illustrating the signal transmission method provided in an embodiment of this application;

[0086] Figure 10 is a schematic diagram of the coverage performance under different cutoff ratios in the same spectral efficiency range provided in the embodiments of this application;

[0087] Figure 11 is a schematic block diagram of a communication device provided in an embodiment of this application;

[0088] Figure 12 is a schematic block diagram of another communication device provided in an embodiment of this application;

[0089] Figure 13 is a schematic diagram of the communication device provided in the embodiment of this application performing communication;

[0090] Figure 14 is a schematic block diagram of the network element function division and protocol layer structure of the open radio access network (O-RAN or ORAN) device provided in the embodiments of this application. Detailed Implementation

[0091] Before describing the technical solutions in this application, the following points should be noted.

[0092] First, in this application, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. For example, "first instruction information" and "second instruction information" are merely used to distinguish different instruction information and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" do not necessarily imply that they are different.

[0093] Second, in this application, the words "exemplarily" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design that is described as "exemplarily" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the words "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0094] Third, in this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0095] Fourth, the correspondences shown in the tables of this application can be configured or predefined. The values ​​of the information in each table are merely examples and can be configured to other values; this application is not limiting. When configuring the correspondences between information and parameters, it is not necessarily required to configure all the correspondences shown in each table. For example, the correspondences shown in some rows of the tables in this application may not be configured. Furthermore, appropriate modifications and adjustments can be made based on the above tables, such as splitting or merging. The names of the parameters shown in the headings of the above tables can also use other names that the communication device can understand, and the values ​​or representations of the parameters can also be other values ​​or representations that the communication device can understand. In implementation, the above tables can also use other data structures, such as arrays, queues, containers, stacks, linear lists, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables, or hash tables, etc.

[0096] Fifth, the preset in this application can be understood as predefined, defined, pre-defined, stored, pre-stored, pre-negotiated, or pre-configured, etc.

[0097] Sixth, in this application, "instruction" can include direct and indirect instructions, as well as explicit and implicit instructions. The information indicated by a certain instruction is called the information to be instructed. In specific implementation, there are many ways to indicate the information to be instructed, such as, but not limited to, directly indicating the information to be instructed, such as the information to be instructed itself or its index. It can also indirectly indicate the information to be instructed by indicating other information, where there is a relationship between the other information and the information to be instructed; or it can indicate only a part of the information to be instructed, while the other parts are known or pre-agreed upon. For example, the instruction can be implemented by using a pre-agreed (e.g., protocol predefined) arrangement of various information, thereby reducing the instruction overhead to some extent. This application does not limit the specific method of instruction. It is understood that for the sender of the instruction, the instruction can be used to indicate the information to be instructed, and for the receiver of the instruction, the instruction can be used to determine the information to be instructed.

[0098] Seventh, the technical solutions of the embodiments of this application can be applied to various communication systems, such as: Long Term Evolution (LTE) systems, 5th Generation (5G) systems, or New Radio (NR) systems, or future communication systems, etc. This application does not limit them.

[0099] Eighth, the terminal equipment in this application may also be referred to as: user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent, or user equipment, etc.

[0100] Terminal devices can be devices that provide voice / data connectivity to users, such as handheld devices with wireless connectivity, in-vehicle devices, etc. Currently, examples of terminal devices include, but are not limited to: mobile phones, tablets, computers with wireless transceiver capabilities (such as laptops, PDAs, etc.), mobile internet devices (MIDs), virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving vehicles, wireless terminals in remote medical care, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, terminals in 5G networks, or future public land mobile communication networks. Terminals in a network (PLMN), such as laptop computers and machine-type communication (MTC) terminals.

[0101] Furthermore, a terminal can also be a terminal in an Internet of Things (IoT) system. IoT is an important component of future information technology development. Its main technical characteristic is connecting objects to networks via communication technologies, thereby realizing an intelligent network that enables human-machine interaction and machine-to-machine interaction. IoT technology can achieve massive connectivity, deep coverage, and low terminal power consumption through technologies such as narrowband (NB).

[0102] In addition, the terminal may also include sensors such as smart printers, train detectors, and gas stations. Its main functions include collecting data (for some terminal devices), receiving control information and downlink data from network devices, and sending electromagnetic waves to transmit uplink data to network devices.

[0103] Ninth, the network equipment involved in this application can be a device that communicates with terminal equipment, and this network equipment can also be called a radio access network device (hereinafter referred to as access network equipment). The network equipment can include various forms of macro base stations, micro base stations (also known as small stations), relay stations, access points, etc. In systems that adopt different radio access technologies, the name of the network equipment may be different. For example, it can be a transmission reception point (TRP), an evolved NodeB (eNB) in an LTE system, a home base station (e.g., home evolved NodeB, or home Node B, HNB), a base band unit (BBU), a radio controller in a cloud radio access network (CRAN) scenario, or a next-generation NodeB (gNB) in an NR system, etc. This application does not limit this.

[0104] The following section will first introduce some of the technical terms used in this application.

[0105] 1. Physical downlink control channel (PDCCH): This can be used to transmit downlink control information (DCI), including but not limited to: scheduling allocation, scheduling authorization, and power control information of the physical downlink shared channel (PDSCH). The resources carried by the PDCCH can occupy the first {1, 2, 3} symbols of a time slot in the time domain; and can occupy the full bandwidth in the frequency domain, or can be configured through parameters. This application does not impose any limitations on this.

[0106] 2. PDSCH: Can be used to transmit downlink user data. Time-domain resource allocation can be indicated by the time-domain resource allocation field in the DCI, which indicates the start symbol and the number of consecutive symbols; frequency-domain resource allocation can be indicated by the frequency domain resource assignment (FDRA) field in the DCI. Frequency-domain resources include allocation methods at the resource element group (REG) granularity and resource block (RB) (or PRB) granularity.

[0107] 3. Physical Uplink Control Channel (PUCCH): This channel can be used to transmit uplink control information (UCI), including but not limited to: hybrid automatic repeat request (HARQ) (such as acknowledgment (ACK)), scheduling request (SR), or channel state information reference signal (CSI) feedback. Unlike DCI, UCI can also be transmitted on the physical uplink shared channel (PUSCH).

[0108] 4. PUSCH: Can be used to transmit uplink user data. To send a PUSCH, the terminal device needs to decode the PDCCH first. The DCI (such as DCI format 0) carried by the PDCCH can indicate how the PUSCH is transmitted over the air interface, including but not limited to: the resources occupied by the PUSCH, MCS, initial or retransmission related information, layer, and precoding information. Furthermore, the time-frequency resource allocation method for PUSCH is similar to that of PDSCH, and will not be detailed here.

[0109] 5. Reference Signal (RS): This can be used for channel measurement, channel estimation, or beam quality detection. Uplink reference signals can refer to reference signals sent from terminal devices to network devices, while downlink reference signals can refer to reference signals sent from network devices to terminal devices. Examples of uplink reference signals include: sounding reference signals (SRS), demodulation reference signals (DMRS) for PUCCH (PUCCH-DMRS), demodulation reference signals (PUSCH-DMRS) for PUSCH, phase tracking reference signals (PTRS), or uplink positioning signals. Examples of downlink reference signals include: channel state information reference signals (CSI-RS), demodulation reference signals (PDCCH-DMRS) for PDCCH, demodulation reference signals (PDSCH-DMRS) for PDSCH, or synchronization signal blocks (SSBs).

[0110] It should be understood that the uplink and downlink reference signals shown above are merely examples and should not be construed as limiting this application in any way. Uplink or downlink reference signals may also include more reference signals, and this application does not preclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions.

[0111] 6. Precoding and Codebook: Multiple-input multiple-output (MIMO) technology is used to increase system capacity and improve throughput. The mathematical expression is y = Hx + n, where y is the received signal, H is the MIMO channel, x is the transmitted signal, and n is noise. In communication systems with multiple antennas, signals from multiple transmit antennas can be superimposed on any one receive antenna. Therefore, the method of transmitting signals at the transmitter affects system performance, and recovering the transmitted signal at the receiver is often complex. In this context, precoding is used to reduce system overhead and maximize the system capacity of MIMO, while also reducing the complexity of eliminating inter-channel interference at the receiver. In this case, the mathematical expression is y = HPx + n, where P is the precoding matrix (or vector). To simplify implementation, P can be selected from a predefined set of matrices (or vectors), called the codebook; this method is also known as a codebook-based transmission method. If the transmitter has all the information in H, P can be obtained at the transmitter itself; this method is also known as a non-codebook (NCB) transmission method.

[0112] Precoding can be performed in two ways: open-loop or closed-loop. In open-loop mode, the sender determines the precoding codebook to be transmitted. In closed-loop mode, the sender determines the precoding codebook to be transmitted based on feedback information or indication information from the receiver.

[0113] 7. Modulation and Demodulation: Modulation refers to the process of processing information from a signal source and adding it to a carrier wave to transform it into a form suitable for channel transmission. Different modes correspond to different modulation methods, such as, but not limited to: multi-carrier modulation, single-carrier modulation, quadrature amplitude modulation (QAM) (e.g., 16-QAM), pulse amplitude modulation (PAM), phase shift keying (PSK) modulation (e.g., BPSK, QPSK), or amplitude shift keying (ASK), etc. Demodulation is the reverse process of modulation, recovering the original data bits or symbols from the signal. Demodulation is sometimes also called detection.

[0114] 8. Layer: The complex symbols (or modulation symbols) obtained by scrambling and modulating one or two codewords are mapped to one or more transmission layers (often also called layers). Transmission layers are typically mapped to antenna ports and are therefore also called antenna ports. Each layer corresponds to one valid data stream. The number of transmission layers, or layer number, is called the "transmission order" or "transmission rank." The transmission rank can change dynamically. The number of layers must be less than or equal to the minimum of the number of transmit antenna ports and the number of receive antenna ports, i.e., "number of layers ≤ min(number of transmit antenna ports, number of receive antenna ports)". In NR downlink communication, the number of transmission layers generally equals the number of antenna ports. In DCI, it indicates the number of layers and / or antenna ports (or, further, the number of each antenna port) used for data and DMRS transmission. In NR, antenna ports can also correspond to transmission configuration indicators (TCIs), beams, etc. For example, one TCI corresponds to multiple antenna ports, or one beam corresponds to multiple antenna ports. For simplicity, TCI, transmission layer, antenna port, and beam can be collectively referred to as the airspace.

[0115] 9. Component Carrier (CC): Each carrier participating in carrier aggregation is called a CC. Among all CCs, the CC that carries signaling transmission and manages other CCs is called the primary carrier, also known as the primary cell (Pcell). The other carriers are called secondary carriers, also known as secondary cells (Scells). Secondary carriers can be used to extend bandwidth and increase data rate, and the primary carrier decides when to add or remove them.

[0116] 10. MCS: Used to define the modulation scheme and coding rate (or code rate) for signal transmission. The protocol defines an MCS table. The MCS table lists different modulation schemes and their corresponding code rates. Table 1 shows an example of an MCS table.

[0117] Table 1

[0118] As shown in Table 1, when the MCS index is 0 or 1, the specific modulation scheme is determined by the q value. For example, when q = 1, the modulation scheme is π / 2-BPSK modulation, the maximum code rate is 314, and the corresponding spectral efficiency is 0.3066; when q = 2, the modulation scheme is QPSK modulation, the maximum code rate is 240, and the corresponding spectral efficiency is 0.2344.

[0119] 11. OFDM Technology: OFDM is a frequency division multiplexing multicarrier transmission technology in which the signals involved in the multiplexing (also called carriers / subcarriers) are orthogonal. OFDM technology converts high-speed data streams into multiple parallel low-speed data streams through serial-to-parallel conversion and distributes them onto several subcarriers of different frequencies for transmission. OFDM technology utilizes mutually orthogonal subcarriers, resulting in overlapping subcarrier spectra. Compared to traditional frequency division multiplexing (FDM) multicarrier modulation systems that require guard intervals between subcarriers, OFDM technology significantly improves spectral efficiency.

[0120] However, OFDM waveforms have a high PAPR. Specifically, the output of a multi-carrier system is the superposition of multiple sub-channel signals. Therefore, if the multiple signals are in phase, the instantaneous power of the resulting superimposed signal will be much higher than the average power of the signals, resulting in a high PAPR. This leads to a large output back-off power of the PA, resulting in a lower transmit power and thus a smaller coverage area.

[0121] 12. DFT-s-OFDM technology: This is a derivative technology based on OFDM. DFT-s-OFDM involves performing transform precoding (also known as Discrete Fourier Transform, DFT) on the subcarriers used by each user, converting them from the time domain to the frequency domain. Then, the frequency domain signals of each user are modulated with OFDM, and the signals from all users are then converted back to the time domain and transmitted together. DFT-s-OFDM technology achieves single-carrier characteristics by introducing a transform precoding step into the OFDM system, thereby reducing PAPR, increasing transmit power, and ultimately improving coverage.

[0122] To further reduce PAPR, FDSS technology based on DFT-s-OFDM can be used. That is, after precoding the data, frequency-domain shaping filtering is applied to the signal to reduce sidelobe superposition of inter-symbol impulses, thereby further reducing PAPR. The transmission process of the FDSS transmitter is explained in detail below with reference to Figure 1. For the reception process of the FDSS receiver, since the receiver can treat the FDSS function as part of the channel, the existing DFT-s-OFDM reception process can be used, and will not be detailed further in this application.

[0123] Figure 1 is a schematic diagram of the FDSS transmitter's transmission process.

[0124] As shown in Figure 1, the data goes through multiple steps in sequence, including modulation, DFT, FDSS, inverse fast fourier transform (IFFT), and adding a cyclic prefix (CP), before being transmitted.

[0125] Figure 2 is a schematic diagram of PAPR with different waveforms.

[0126] As shown in Figure 2, the horizontal axis represents the PAPR value (unit: decibel, dB), and the vertical axis represents the probability that the PAPR exceeds a certain value (cumulative distribution function (CDF)). It can be seen that the FDSS waveform based on π / 2-BPSK modulation has the lowest PAPR, followed by the DFT-s-OFDM waveform based on QPSK modulation, while the DFT-s-OFDM waveform based on 16-QAM modulation has the highest PAPR. The FDSS waveform further reduces the PAPR, thereby further improving the signal coverage.

[0127] Whether in the DFT-s-OFDM technology mentioned above or in the FDSS technology based on DFT-s-OFDM, if a low- or medium-order modulation method is used, such as BPSK modulation, QPSK modulation or 16-QAM mentioned above, the spectral efficiency may be low because each symbol represents fewer bits of data.

[0128] In view of this, this application provides a signal transmission method in which a network device can configure a relationship between the bandwidth of the generated signal and the bandwidth of the transmitted signal for a terminal device. The bandwidth of the transmitted signal is less than the bandwidth of the generated signal. Based on the configured relationship between the bandwidths of the first and second signals, the terminal device can transmit a portion of the generated first signal (i.e., a second signal), so that the network device can recover the first signal from the second signal. This achieves the transmission of an equivalent amount of data using less bandwidth, thus improving spectral efficiency. Furthermore, the terminal device can employ transform precoding technology when generating the first signal, which also ensures signal coverage. Therefore, the above signal transmission method helps to improve spectral efficiency while ensuring coverage.

[0129] For example, the above signal transmission method is applied to scenarios where the modulation scheme is low-to-medium order modulation (such as π / 2-BPSK). The network device can configure the relationship between the bandwidth of the generated signal and the bandwidth of the actually transmitted signal for the terminal device. The bandwidth of the generated signal is greater than the bandwidth of the actually transmitted signal. Accordingly, the terminal device can generate a first signal based on transform precoding and filter out a portion of the first signal to obtain and transmit a second signal. The bandwidth of the filtered signal can be determined based on the relationship between the bandwidth of the generated signal and the bandwidth of the actually transmitted signal configured by the network device. After receiving the second signal, the network device can recover the first signal based on frequency domain symmetry characteristics (e.g., frequency domain conjugate symmetry characteristics). In this way, the amount of data transmitted by the terminal device using less bandwidth (i.e., the bandwidth of the second signal) is equivalent to the amount of data transmitted by the first signal, which helps improve spectral efficiency.

[0130] Before describing the above method in detail, the communication system applicable to the embodiments of this application will be described in detail below with reference to FIG3.

[0131] Figure 3 is a schematic diagram of a communication system 300 applied in an embodiment of this application. The communication system 300 may include at least one network device, such as network device 310 shown in Figure 3; the communication system 300 may also include at least one terminal device, such as terminal device 320 shown in Figure 3. Network device 310 and terminal device 320 can communicate via a wireless link. In one possible scenario, network device 310 can act as a receiver, and terminal device 320 can act as a transmitter, with terminal device 320 sending signals to network device 310, such as by sending signals to network device 310 via PUSCH. However, this should not constitute any limitation on this application. For example, in another possible scenario, network device 310 can act as a transmitter, and terminal device 320 can act as a receiver, with network device 310 sending signals to terminal device 320.

[0132] Figure 3 exemplarily illustrates a network device 310 and a terminal device 320. Optionally, the communication system 300 may further include multiple network devices and / or multiple terminal devices. The network device 310 may be a router, base station, etc., and the terminal device 320 may be a mobile phone, tablet computer, smart bracelet, etc., which are not limited in this application embodiment.

[0133] The aforementioned communication devices, such as network device 310 or terminal device 320 in Figure 3, can be configured with multiple antennas. These multiple antennas may include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals. Additionally, each communication device also includes a transmitter chain and a receiver chain, which, as will be understood by those skilled in the art, may include multiple components related to signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, or antennas). Therefore, network device 310 and terminal device 320 can communicate via multi-antenna technology.

[0134] Optionally, the communication system 300 may also include other network entities such as a network controller and a mobility management entity, but the embodiments of this application are not limited thereto.

[0135] It should also be understood that the method provided in the embodiments of this application can be applied to a variety of communication systems, including NR communication systems. Communication system 300 is only an example. This application does not limit the specific architecture of the applicable system, nor does it limit the number and form of various devices contained in each communication system.

[0136] The signal transmission method of this application will be described in detail below with reference to Figure 4. The embodiments shown in this application illustrate the method provided by this application from the perspective of communication device interaction. The specific form and number of each communication device shown are merely examples and should not constitute any limitation on the implementation of the method provided by this application. Below, the signal transmission method of the embodiments of this application will be described in detail using a terminal device as the first communication device and a network device as the second communication device as the execution subject. The aforementioned terminal device is an example of the first communication device, and the network device is an example of the second communication device.

[0137] It should be understood that the first communication device can be a terminal device, or a chip, chip system, or processor that supports the terminal device in implementing the signal transmission method, or a logic module or software that can implement all or part of the terminal device; the second communication device can be a network device, or a chip, chip system, or processor that supports the network device in implementing the signal transmission method, or a logic module or software that can implement all or part of the network device, and this application does not make any specific limitations in this regard.

[0138] Figure 4 is a schematic flowchart of a signal transmission method 400 provided in an embodiment of this application. This method 400 can be applied, for example, to system 300, and includes the following steps:

[0139] In step 410, the network device sends first configuration information, which configures the relationship between the bandwidth of the first signal and the bandwidth of the second signal, wherein the bandwidth of the first signal is greater than the bandwidth of the second signal. Correspondingly, the terminal device receives the aforementioned first configuration information.

[0140] The first signal mentioned above is a signal generated by the terminal device through transform precoding. For example, the first signal has a DFT-s-OFDM waveform. The second signal mentioned above can be regarded as a part of the first signal, or the second signal is a processed part of the first signal. For example, the second signal can be a filtered signal of the first signal based on the relationship between the bandwidth of the first signal and the bandwidth of the second signal.

[0141] For example, the network device determines the first configuration information and sends the first configuration information to the terminal device, and the terminal device receives the first configuration information accordingly.

[0142] Optionally, the relationship between the bandwidth of the first signal and the bandwidth of the second signal can be characterized by a truncated rate, a difference, or other methods. This application does not limit this method. The truncated rate can be used to indicate the proportion of the bandwidth of the filtered signal in the bandwidth of the first signal. The truncated rate can also be given other names, which are not limited in this application. The two characterization methods will be explained in detail below.

[0143] In one possible implementation, the relationship between the bandwidth of the first signal and the bandwidth of the second signal is characterized by a truncation ratio, which is greater than 0 and less than 100%. Regarding the aforementioned truncation ratio, this application provides the following possible designs:

[0144] Design 1: The above-mentioned truncation ratio is the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal. In other words, the first configuration information can configure the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal. The filtered signal can be understood as the signal in the first signal excluding the second signal. Under this design, the value range of the above-mentioned truncation ratio can be (0, 50%).

[0145] Design 2: The aforementioned truncation ratio is the ratio of the bandwidth of the second signal to the bandwidth of the first signal. In other words, the first configuration information can configure the ratio of the bandwidth of the second signal to the bandwidth of the first signal. Under this design, the value range of the aforementioned truncation ratio can be [50%, 100%].

[0146] Design 3: The aforementioned truncation ratio is the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal. In other words, the first configuration information can configure the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal. The filtered signal can be understood as any signal in the first signal other than the second signal. Under this design, the value range of the aforementioned truncation ratio can be (0, 25%).

[0147] Design 4: The aforementioned truncation ratio is the ratio of half the bandwidth of the second signal to the bandwidth of the first signal. In other words, the first configuration information can be configured to set the ratio of half the bandwidth of the second signal to the bandwidth of the first signal. Under this design, the value range of the aforementioned truncation ratio can be [25%, 50%].

[0148] Figure 5 is a schematic diagram showing the relationship between the bandwidth of the first signal and the bandwidth of the second signal provided in the embodiments of this application. Figure 5 shows the above-mentioned truncation ratio (represented by t) under the above four possible designs. In Figure 5, S[1] and S[2] refer to the representation of the second signal in the frequency domain. S[1] and S[2] can be considered as the components of the second signal in the frequency domain. S[1]* and S[1] are conjugate transposes of each other, and S[2]* and S[2] are conjugate transposes of each other.

[0149] As shown in Figure 5a), t = X / Y, where X represents the bandwidth of the second signal and Y represents the bandwidth of the first signal. As shown in Figure 5b), t = (X1 + X2) / Y, where X1 represents a portion of the bandwidth of the filtered signal, X2 represents another portion of the bandwidth of the filtered signal, and Y represents the bandwidth of the first signal. By way of example and not limitation, X1 = X2; in some implementations, X1 and X2 may have different values. As shown in Figure 5c), t = X3 / Y, where X3 represents a portion of the bandwidth of the second signal and Y represents the bandwidth of the first signal. By way of example and not limitation, X3 = X / 2, that is, X3 represents half of the bandwidth of the second signal; in some implementations, X3 may also have other values, such as X3 = X / 4, which is not limited in this application. As shown in Figure 5d), t = X1 / Y, where X1 represents a portion of the bandwidth of the filtered signal and Y represents the bandwidth of the first signal. By way of example and not limitation, X1 = (Y - X) / 2, that is, X1 represents half the bandwidth of the filtered signal. In some implementations, X1 can also be other values, such as X1 = (Y - X) / 4, which is not limited in this application.

[0150] It should be understood that the above-mentioned truncation ratio design is only an example and should not constitute any limitation on the embodiments of this application. Other designs can also be adopted for the above-mentioned truncation ratio, as long as the terminal device can determine the bandwidth of the signal to be filtered based on the above-mentioned truncation ratio.

[0151] In another possible implementation, the relationship between the bandwidth of the first signal and the bandwidth of the second signal is characterized by a difference. That is, the first configuration information can configure the difference between the bandwidth of the first signal and the bandwidth of the second signal, and this difference can be greater than 0, for example. It is understood that simple transformations of the above meaning should also fall within the scope of protection of this application. For example, the first configuration information configures half (or 1 / 3, etc.) of the difference between the bandwidth of the first signal and the bandwidth of the second signal, or the first configuration information configures the difference between the bandwidth of the second signal and the bandwidth of the first signal, or the first configuration information configures the absolute value (or the opposite number) of the difference between the bandwidth of the second signal and the bandwidth of the first signal, etc., which will not be listed here.

[0152] In the above scheme, this application provides multiple possible designs for configuring the relationship between the bandwidth of the first signal and the bandwidth of the second signal, so that the terminal device can filter out part of the signal in the first signal based on the first configuration information to obtain and transmit the second signal. This uses less bandwidth to transmit an equivalent amount of data, which helps to improve spectral efficiency. In addition, multiple configuration methods for the relationship between the first signal and the second signal are provided, which helps to improve the flexibility of configuration.

[0153] In one possible implementation, the aforementioned first configuration information can be carried in a medium access control-control element (MAC-CE). That is, the information configuring the relationship between the bandwidth of the first signal and the bandwidth of the second signal can be carried in the MAC-CE. It is understood that the aforementioned first configuration information can also be carried in other signaling, such as radio resource control signaling, etc., and this application does not specifically limit it in this regard.

[0154] In one possible implementation, the first configuration information described above is also used to configure at least one of the following: scheduling bandwidth, transmission bandwidth, MCS, filter type, or filter tap coefficients. These parameters will be explained in detail below.

[0155] 1. Scheduling bandwidth

[0156] The aforementioned scheduling bandwidth is the bandwidth allocated by the network device to the terminal device. For example, the aforementioned scheduling bandwidth can be the bandwidth of the first signal, that is, the aforementioned scheduling bandwidth can be the bandwidth of the first signal allocated by the network device to the terminal device, or the bandwidth of the signal before truncation, or the bandwidth of the generated signal.

[0157] The aforementioned scheduling bandwidth can be characterized by the number of PRBs (or RBs) or TBS. TBS refers to the amount of data that can be transmitted in a single transmission, expressed in bits. TBS is related to the number of PRBs and MCS. It should be understood that the aforementioned scheduling bandwidth can also be characterized by other parameters, which this application does not limit. For example, the aforementioned scheduling bandwidth can also be characterized by the number of modulation symbols, or it can be described or quantized by a specific bit sequence. For instance, multiple bit sequences correspond to multiple values ​​of the scheduling bandwidth, and the size of the scheduling bandwidth can be described by the bit sequence. For example, the correspondence includes 10 MHz corresponding to 000, 20 MHz to 001, 30 MHz to 011, and so on, which will not be listed here.

[0158] Depending on the different ways of representing the relationship between the bandwidth of the first signal and the bandwidth of the second signal, the scheduling bandwidth, the bandwidth of the second signal, and the formulas satisfied by the above relationship will differ. It can be understood that the bandwidth of the second signal (i.e., the bandwidth of the actually transmitted signal) can be determined based on the relationship between the scheduling bandwidth and the bandwidths of the first and second signals. For example, the relationship between the bandwidths of the first and second signals can be represented by a truncation ratio (denoted by t). When the truncation ratio is the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal, the scheduling bandwidth satisfies: Second signal bandwidth = Scheduling bandwidth × (1 - t). When the truncation ratio is half the bandwidth of the filtered signal to the bandwidth of the first signal, the scheduling bandwidth satisfies: Second signal bandwidth = Scheduling bandwidth × (1 - 2t). When the truncation ratio is the ratio of the bandwidth of the second signal to the bandwidth of the first signal, the scheduling bandwidth satisfies: Second signal bandwidth = Scheduling bandwidth × t. When the truncation ratio is half the bandwidth of the second signal to the bandwidth of the first signal, the scheduling bandwidth satisfies: Second signal bandwidth = Scheduling bandwidth × 2t.

[0159] According to the definition of scheduling bandwidth, the upper limit of scheduling bandwidth can be the bandwidth configured for a single CC (or bandwidth part (BWP)) × (1 / (the upper limit of t)). For example, the upper limit of t is 50%, the bandwidth of BWP is 10MHz, and the upper limit of scheduling bandwidth is 20MHz.

[0160] 2. Transmission bandwidth

[0161] Transmission bandwidth is the bandwidth used when transmitting a second signal, or the bandwidth of the truncated signal, or the bandwidth of the actual transmitted signal, or the baseband signal bandwidth passing through the air interface channel.

[0162] The aforementioned transmission bandwidth can be characterized by the number of PRBs (or RBs) or TBS. It should be understood that the aforementioned transmission bandwidth can also be characterized by other parameters, and this application does not limit this. For example, the aforementioned transmission bandwidth can also be characterized by the number of modulation symbols, or it can be described or quantized by a specific bit sequence. For specific methods of describing or quantizing the transmission bandwidth using a specific bit sequence, please refer to the relevant explanations of scheduling bandwidth; these will not be detailed here.

[0163] Depending on the different ways of representing the relationship between the bandwidth of the first signal and the bandwidth of the second signal, the formulas satisfying the above relationship for the transmission bandwidth, the bandwidth of the first signal, and the above relationship will differ. It can be understood that the bandwidth of the first signal (i.e., the bandwidth of the generated signal) can be determined based on the relationship between the transmission bandwidth and the bandwidths of the first and second signals. For example, the relationship between the bandwidths of the first and second signals can be represented by a truncation ratio (denoted by t). When the truncation ratio is the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal, the transmission bandwidth satisfies: Transmission bandwidth = Bandwidth of the first signal × (1 - t). As another example, when the truncation ratio is the ratio of the bandwidth of the second signal to the bandwidth of the first signal, the transmission bandwidth satisfies: Transmission bandwidth = Bandwidth of the first signal × t.

[0164] For example, the bandwidth of the first signal is characterized by the number of modulated symbols that can be generated, and the transmission bandwidth is characterized by the number of modulated symbols that are actually transmitted. When the above truncation ratio is the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal, the actual number of modulated symbols transmitted = the number of modulated symbols that can be generated × (1 - t). When the above truncation ratio is the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal, the actual number of modulated symbols transmitted = the number of modulated symbols that can be generated × (1 - 2t). When the above truncation ratio is the ratio of the bandwidth of the second signal to the bandwidth of the first signal, the actual number of modulated symbols transmitted = the number of modulated symbols that can be generated × t. When the above truncation ratio is the ratio of half the bandwidth of the second signal to the bandwidth of the first signal, the actual number of modulated symbols transmitted = the number of modulated symbols that can be generated × 2t.

[0165] It is understood that in the above example, the number of modulated symbols that can be generated can be replaced with the number of PRBs that can be generated, and the number of modulated symbols that are actually transmitted can be replaced with the number of PRBs that are actually transmitted. This application does not limit the bandwidth characterization parameters.

[0166] For example, in the case of frequency range 1 (FR1) and subcarrier spacing (SCS) of 30 Hz, the number of PRBs actually transmitted does not exceed 273, where 273 is the maximum number of PRBs contained in a single CC in a 100 MHz bandwidth.

[0167] It is understandable that the first configuration information mentioned above may configure either the scheduling bandwidth or the transmission bandwidth. Under this implementation, how can the terminal device determine whether the bandwidth configured in the first configuration information is the scheduling bandwidth or the transmission bandwidth? One possible solution is that, in one or more of the following situations, the first configuration information configures the scheduling bandwidth, that is, the bandwidth of the signal before truncation.

[0168] Scenario 1: The network device sends a fourth instruction message, which instructs the terminal device to send a signal using a first transmission mode, where the bandwidth of the second signal is less than the bandwidth of the first signal.

[0169] Scenario 2: The network device is configured with a relationship between the bandwidth of the first signal and the bandwidth of the second signal, and the bandwidth of the first signal is greater than the bandwidth of the second signal.

[0170] It should be noted that the names of the above-mentioned transmission bandwidth and scheduling bandwidth are merely examples and should not constitute any limitation on this application, nor does it preclude the possibility of using other names in the protocol.

[0171] Optionally, the aforementioned scheduling bandwidth and / or transmission bandwidth can be carried in the DCI. For example, it can be indicated through the frequency domain resource allocation field in the DCI.

[0172] Figure 6 is a schematic diagram of the scheduling bandwidth and transmission bandwidth provided in an embodiment of this application.

[0173] As shown in Figure 6a), the network device indicates the transmission bandwidth via DCI and the relationship between the bandwidths of the first and second signals via MAC-CE. Here, the transmission bandwidth can be understood as the bandwidth of the second signal, or the bandwidth of the actually transmitted signal, or the bandwidth of the baseband signal passing through the air interface channel. As shown in Figure 6b), the network device indicates the scheduling bandwidth via DCI and the relationship between the bandwidths of the first and second signals via MAC-CE. Here, the scheduling bandwidth can be understood as the bandwidth of the first signal, or the bandwidth of the signal that can be generated.

[0174] It should be understood that the relationship between the bandwidth of the first signal and the bandwidth of the second signal in Figure 6 is taken as an example of the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal, but this should not constitute any limitation on this application. The above relationship can also be other designs. For details, please refer to the explanation of the above relationship and Figure 5.

[0175] By rationally configuring the aforementioned scheduling bandwidth and transmission bandwidth using the first configuration information, it is helpful to optimize the use of spectrum resources and adapt to the needs of different users.

[0176] 3. MCS

[0177] The aforementioned MCS can be indicated based on an MCS index, which is an item in a first correspondence. This first correspondence is used to indicate the correspondence between multiple MCS indices, multiple code rates, and multiple spectral efficiencies under the π / 2-BPSK modulation scheme. The multiple code rates include at least one of the code rate corresponding to the first signal and the code rate corresponding to the second signal, and the multiple spectral efficiencies include at least one of the spectral efficiency corresponding to the first signal and the spectral efficiency corresponding to the second signal.

[0178] In other words, network devices can instruct terminal devices on the MCS index. Based on the MCS index and the first correspondence, the terminal device can determine the code rate and spectral efficiency corresponding to the MCS index. It's easy to understand that network devices configure the MCS by instructing on the MCS index; the MCS index occupies fewer information bits, which helps reduce signaling overhead.

[0179] The aforementioned first correspondence can be predefined or configured by the network device, and this application does not limit it.

[0180] Optionally, the network device instructs the terminal device to adopt the aforementioned first correspondence; or, the terminal device determines to adopt the aforementioned first correspondence according to a preset rule. The preset rule could be, for example, that when the first configuration information configures the relationship between the bandwidth of the first signal and the bandwidth of the second signal, and the bandwidth of the first signal is greater than the bandwidth of the second signal, the first communication device determines the MCS based on the aforementioned first correspondence.

[0181] In one possible implementation, the network device sends a first indication message instructing the terminal device to determine the MCS based on a first correspondence. This prevents the first communication device from using an incorrect correspondence, thus improving the accuracy of the determined MCS.

[0182] For example, the aforementioned first indication information can be carried in either the MAC-CE or the DCI, and this application does not limit this. Specifically, when the first indication information is carried in the MAC-CE, the MAC-CE and the MAC-CE carrying the relationship between the bandwidth of the first signal and the bandwidth of the second signal can be the same signaling or different signaling, and this application does not limit this. Similarly, when the first indication information is carried in the DCI, the DCI and the DCI carrying the scheduling bandwidth (or transmission bandwidth) can be the same signaling or different signaling.

[0183] In another possible implementation, the terminal device receives first configuration information that configures the relationship between the bandwidths of a first signal and a second signal, wherein the bandwidth of the first signal is greater than the bandwidth of the second signal. The terminal device uses this first correspondence to determine the code rate and spectral efficiency corresponding to the MCS index. Thus, determining the first correspondence based on preset rules helps reduce signaling overhead.

[0184] As an example and not a limitation, the above first correspondence can be represented by an MCS table. For example, the above MCS table can be used for π / 2-BPSK modulation to provide more code rate options when the terminal device modulates the signal based on π / 2-BPSK modulation, thereby improving flexibility. Examples of MCS tables for π / 2-BPSK modulation will be given below with reference to Tables 2 to 4.

[0185] Table 2

[0186] As shown in Table 2, the generated spectral efficiency is the spectral efficiency corresponding to the first signal, and the generated code rate is the code rate corresponding to the first signal. This MCS table includes multiple MCS indices, multiple generated code rates, and multiple generated spectral efficiencies. For example, the above MCS table can be defined according to the spectral efficiency corresponding to the bandwidth of the generated signal, where the generated spectral efficiency does not exceed 1, that is, the generated spectral efficiency is less than or equal to 1. Existing standards (such as technical specifications (TS) 38.214 V18.4.0) only define the code rate and spectral efficiency corresponding to MCS indices of 0 and 1 for π / 2-BPSK modulation. The MCS table shown in Table 2 indicates more code rate options, which is beneficial for improving the flexibility of terminal devices in selecting code rates.

[0187] Table 3

[0188] As shown in Table 3, the actual spectral efficiency is the spectral efficiency corresponding to the second signal, and the actual code rate is the code rate corresponding to the second signal. This MCS table includes multiple MCS indices, multiple actual code rates, and multiple actual spectral efficiencies. For example, the above MCS table can be defined according to the spectral efficiency corresponding to the bandwidth of the actual transmitted signal, and this actual spectral efficiency can exceed 1.

[0189] Table 4

[0190] As shown in Table 4, this MCS table includes the correspondence between multiple MCS indices, multiple actual code rates, multiple actual spectral efficiencies, multiple generated code rates, and multiple generated spectral efficiencies. Specifically, the generated spectral efficiency is the spectral efficiency corresponding to the first signal (i.e., the signal before truncation or the signal that can be generated), the actual spectral efficiency is the spectral efficiency corresponding to the second signal (i.e., the signal actually transmitted), the actual code rate is the code rate corresponding to the second signal, and the generated code rate is the code rate corresponding to the first signal. The MCS table shown in Table 4 illustrates more code rate options under π / 2-BPSK modulation, which helps improve the flexibility of terminal devices in selecting code rates.

[0191] It is understood that the spectral efficiency of the second signal is related to the following parameters: the spectral efficiency of the first signal, and the relationship between the bandwidth of the first signal and the bandwidth of the second signal. As an example and not a limitation, the relationship between the bandwidth of the first signal and the bandwidth of the second signal is characterized by a truncation ratio, and the definition of the truncation ratio is shown in b) of Figure 5. Then, the spectral efficiency of the second signal = the spectral efficiency of the first signal ÷ (1 - truncation ratio).

[0192] The relationship between the MCS, the bandwidth of the first signal, and the bandwidth of the second signal, as well as the scheduling bandwidth, can be used together to calculate the TBS of the second signal.

[0193] Properly configuring the MCS using the initial configuration information helps improve signal transmission rate and reliability.

[0194] 4. Filter type and filter tap coefficients

[0195] The filter type can be root raised cosine (RRC), raised cosine (RC), or piecewise linear (PWL), etc. This application does not specify a particular filter type.

[0196] Filter tap coefficients refer to the weight values ​​of a filter, which determine how the filter processes the input signal. For example, filter tap coefficients can be of the finite-length impulse response (FIR) type. This application does not limit the type of filter tap coefficients.

[0197] Optionally, the filter type and filter tap coefficients are indicated based on a filter index, which is an item in a second correspondence indicating a correspondence between at least one filter index, at least one filter type, and at least one filter tap coefficient. The filter type and filter tap coefficients can be determined by the terminal device based on the filter index and the second correspondence.

[0198] In other words, network devices can indicate filter indices so that terminal devices can determine the filter type and filter tap coefficients corresponding to the filter index based on the aforementioned filter index and the second correspondence. This reduces the number of information bits required for the filter index, thus lowering signaling overhead.

[0199] Optionally, the aforementioned second correspondence may be predefined or indicated by the network device, and this application does not limit this. For example, the network device sends second configuration information, which is used to configure the aforementioned second correspondence. Table 5 shows a schematic of the second correspondence.

[0200] Table 5

[0201] As shown in Table 5, the second correspondence indicates multiple filter indices and the corresponding filter type and filter tap coefficients for each filter index. Network devices can indicate one or more of these filter indices so that terminal devices can determine the corresponding filter type and filter tap coefficients based on the filter index.

[0202] Optionally, a filter type may include one or more sets of filter tap coefficients, and the filter lengths of different sets may also be different.

[0203] In step 420, the terminal device sends a second signal based on the aforementioned first configuration information. Correspondingly, the network device receives the second signal.

[0204] As an example and not a limitation, the terminal device may perform one or more processing steps based on the first configuration information described above, such as TBS calculation, low-density parity-check code (LDPC) encoding, modulation mapping, transform precoding (DFT), frequency domain truncation filtering (filtering out part of the signal according to the relationship between the bandwidth of the first signal and the bandwidth of the second signal), reference signal generation, precoding, and mid-frequency radio frequency, to determine the second signal and transmit it through a physical antenna (beamforming).

[0205] The reference signal, that is, the second signal, can be of the type SRS, PUCCH-DMRS, PUSCH-DMRS, PTRS, or uplink positioning signal, etc., and this application does not limit it.

[0206] Figure 7 is a schematic diagram of the transmitter transmitting a second signal according to an embodiment of this application. The process of the transmitter transmitting the second signal will be described in detail below with reference to Figure 7.

[0207] As shown in Figure 7, after the bits to be transmitted are generated, they undergo LDPC encoding, QAM modulation, layer mapping, DFT+frequency domain filtering, precoding, IFFT, CP addition, and digital-to-analog conversion (DAC) to generate a second signal, which is then transmitted through a physical antenna.

[0208] Figure 8 is a schematic diagram of the receiver receiving the second signal according to an embodiment of this application. The process of the receiver receiving the second signal will be described in detail below with reference to Figure 8.

[0209] As shown in Figure 8, the network device receives the second signal at a designated antenna port based on the first configuration information. The receiving bandwidth and frequency information are determined according to the truncated signal (i.e., the second signal). Then, the modulation symbols to be demodulated are obtained through at least one step, including low noise amplifier (LNA), local oscillator (LO), analog-to-digital converter (ADC), CP removal, FFT, frequency domain equalization, receiver combining, phase noise compensation, layer inverse mapping, decoding, and demodulation. The number of modulation symbols is the number of modulation symbols determined by the bandwidth of the signal before truncation (i.e., the first signal).

[0210] It is understandable that the network device can recover the first signal based on the received second signal, for example, it can recover the first signal based on the frequency domain symmetry characteristics (specifically, the frequency domain conjugate symmetry characteristics). For example, the π / 2-BPSK signal usually has frequency domain conjugate symmetry characteristics because the π / 2-BPSK signal is a real-valued signal, and the spectrum of a real-valued signal is conjugate symmetric in the frequency domain. This means that the positive frequency part and the negative frequency part of the spectrum are conjugate symmetric. Referring to Figure 5, S[1]* and S[1] are conjugate transposes of each other, and S[2]* and S[2] are conjugate transposes of each other. That is to say, the network device can construct the spectrum of the negative frequency part based on the spectrum of the positive frequency part according to the conjugate symmetry characteristics, and convert the complete spectrum back to the time domain signal.

[0211] As an optional implementation, the method 400 further includes: the terminal device transmitting capability information, which indicates at least one of the following: first information, a supported maximum scheduling bandwidth, a supported maximum transmission bandwidth, a supported spectral efficiency range, or a supported filter frequency range, wherein the first information indicates the relationship between the bandwidth of a first signal and the bandwidth of a second signal supported by the terminal device. Accordingly, the network device receives the capability information. As an example and not a limitation, upon receiving the capability information, the network device transmits first configuration information based on the capability information. For example, the transmission bandwidth configured by the network device, the relationship between the bandwidth of the first signal and the bandwidth of the second signal, etc., may not exceed the maximum scheduling bandwidth, the maximum transmission bandwidth, the first information, etc., reported by it.

[0212] In one possible implementation, the first information is represented by a truncation ratio, and the maximum supported truncation ratio is related to the maximum supported transmission bandwidth. As an example, and not a limitation, there is a one-to-one correspondence between the maximum supported truncation ratio and the maximum supported transmission bandwidth. When the truncation ratio is the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal, the truncation ratio A and the transmission bandwidth (e.g., represented by the number of PRBs) B satisfy: B = 273 × (1 - A). In this case, the transmission bandwidth refers to the bandwidth of the second signal, that is, the bandwidth of the actual transmitted signal allocated by the network device. 273 is the maximum number of PRBs contained in a single CC in 100MHz bandwidth under non-truncation mode.

[0213] Table 6 shows an example of the correspondence between truncation ratio and transmission bandwidth.

[0214] Table 6

[0215] As shown in Table 6, the truncation ratio and transmission bandwidth are in one-to-one correspondence. Terminal devices can report the maximum supported truncation ratio or the maximum supported transmission bandwidth. Taking the maximum supported transmission bandwidth reported by the terminal device as an example, the network device can determine the maximum supported truncation ratio based on the maximum transmission bandwidth and the correspondence shown in Table 6.

[0216] By establishing the correspondence between the aforementioned truncation ratio and transmission bandwidth, the terminal device can report one of these parameters, and the network device can then determine that parameter and its corresponding parameter, which helps to reduce signaling overhead.

[0217] Optionally, the correspondence between the above-mentioned truncation ratio and transmission bandwidth can be predefined, such as predefining the formula that the above-mentioned truncation ratio and transmission bandwidth satisfy; the correspondence between the above-mentioned truncation ratio and transmission bandwidth can also be indicated (or configured) by the network device, and this application does not limit this.

[0218] In another possible implementation, the first information is represented by a truncation ratio, and the maximum supported truncation ratio is related to the maximum supported scheduling bandwidth (or the bandwidth of the first signal). As an example, and not a limitation, there is a one-to-one correspondence between the maximum supported truncation ratio and the maximum supported scheduling bandwidth. When the truncation ratio is the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal, the truncation ratio A and the scheduling bandwidth (e.g., represented by the number of PRBs) B satisfy: B = 273 / A. In this case, the scheduling bandwidth refers to the bandwidth of the first signal. 273 represents the maximum number of PRBs contained in a single CC within a 100MHz bandwidth in the non-truncation mode; the maximum number of PRBs corresponding to the first signal is 546.

[0219] Table 7 shows an example of the correspondence between truncation ratio and scheduling bandwidth.

[0220] Table 7

[0221] As shown in Table 7, the truncation ratio and scheduling bandwidth are in one-to-one correspondence. Terminal devices can report the maximum supported truncation ratio or the maximum supported scheduling bandwidth. Taking the maximum supported scheduling bandwidth reported by the terminal device as an example, the network device can determine the maximum supported truncation ratio based on the maximum scheduling bandwidth and the correspondence shown in Table 7.

[0222] By establishing the correspondence between the aforementioned truncation ratio and scheduling bandwidth, the network device can determine the parameter and its corresponding parameter by having the terminal device report one of them, which helps reduce signaling overhead.

[0223] Optionally, the correspondence between the above-mentioned truncation ratio and scheduling bandwidth can be predefined, such as predefining the formula that the above-mentioned truncation ratio and scheduling bandwidth satisfy; the correspondence between the above-mentioned truncation ratio and scheduling bandwidth can also be indicated (or configured) by the network device, and this application does not limit this.

[0224] In another possible implementation, the first information is characterized by a truncation ratio, and the maximum supported truncation ratio is related to the supported spectral efficiency range, such as a one-to-one correspondence between the maximum supported truncation ratio and the supported spectral efficiency range. Table 8 shows an example of the correspondence between truncation ratios and spectral efficiency ranges.

[0225] Table 8

[0226] As shown in Table 8, there is a one-to-one correspondence between the truncation ratio and the spectral efficiency range. Terminal devices can report the maximum supported truncation ratio or the supported spectral efficiency range. Taking the supported spectral efficiency range reported by the terminal device as an example, the network device can determine the maximum supported truncation ratio based on the correspondence between the spectral efficiency range and the one shown in Table 8.

[0227] By establishing the correspondence between the aforementioned truncation ratio and spectrum efficiency range, the terminal device can report one of these parameters, and the network device can then determine that parameter and its corresponding parameter, which helps to reduce signaling overhead.

[0228] Optionally, the correspondence between the above-mentioned truncation ratio and the spectrum efficiency range can be predefined; the correspondence between the above-mentioned truncation ratio and the spectrum efficiency range can also be indicated (or configured) by the network device, and this application does not limit this.

[0229] In another possible implementation, the first information is characterized by a cutoff ratio, and the maximum supported cutoff ratio is related to the supported filter frequency range, such as a one-to-one correspondence between the maximum supported cutoff ratio and the supported filter frequency range. Table 9 shows an example of the correspondence between cutoff ratios and filter frequency ranges.

[0230] Table 9

[0231] As shown in Table 9, there is a one-to-one correspondence between the truncation ratio and the filter frequency range. The terminal device can report the maximum supported truncation ratio or the supported filter frequency range. Taking the supported filter frequency range reported by the terminal device as an example, the network device can determine the maximum supported truncation ratio based on the correspondence between the filter frequency range and the one shown in Table 9.

[0232] Optionally, the correspondence between the cutoff ratio and the filter frequency range can be predefined; the correspondence between the cutoff ratio and the filter frequency range can also be indicated (or configured) by the network device, and this application does not limit this.

[0233] In one possible implementation, the method 400 further includes: a network device sending fourth indication information, and a terminal device receiving the fourth indication information, the fourth indication information being used to instruct the terminal device to send a signal using a first transmission mode, the first transmission mode being a mode in which the bandwidth of the second signal is less than the bandwidth of the first signal, or in other words, the first transmission mode being a mode in which the bandwidth of the actually transmitted signal is less than the bandwidth of the generated signal.

[0234] Optionally, the aforementioned fourth instruction information may be carried in a radio resource control message, MAC-CE, or DCI, and this application does not limit this.

[0235] In method 400 described above, the network device can configure the relationship between the bandwidth of the generated signal and the bandwidth of the transmitted signal for the terminal device. The bandwidth of the transmitted signal is less than the bandwidth of the generated signal. Therefore, based on the configured relationship between the bandwidths of the first and second signals, the terminal device can transmit a portion of the generated first signal (i.e., the second signal), so that the network device can recover the first signal from the second signal. In this way, an equivalent amount of data is transmitted using less bandwidth, which helps improve spectral efficiency. Furthermore, the terminal device can employ transform precoding technology when generating the first signal, which also ensures signal coverage. Thus, the above signal transmission method helps improve spectral efficiency while ensuring coverage.

[0236] It is understandable that while transmitting signals based on the first transmission mode described above can improve spectral efficiency, it may increase PAPR. As a result, the actual coverage gain may decrease. Therefore, under the premise of the same spectral efficiency, the terminal cannot determine which waveform (or the relationship between the bandwidth of the first signal and the bandwidth of the second signal) (which may also include the case where the first signal is not truncated, that is, the bandwidth of the first signal is equal to the bandwidth of the second signal) is better. Therefore, how the terminal selects the waveform to transmit the uplink signal becomes a problem.

[0237] To address this, this application provides another signal transmission method. The network device can configure different relationships (such as different truncation ratios) between the bandwidth of the first signal and the bandwidth of the second signal for the terminal device. This allows the terminal device to send uplink signals based on these different relationships and provide feedback on their respective output power back-off amounts. This, in turn, enables the network device to determine a better waveform or a better truncation ratio for the same spectral efficiency based on the output power back-off amount. For example, a smaller output power back-off amount results in a better waveform and a wider coverage area.

[0238] Figure 9 is another schematic flowchart of a signal transmission method 900 provided in an embodiment of this application. This method 900 is applicable to system 300 and includes the following steps:

[0239] In step 910, the network device sends multiple first configuration information messages, each of which configures the relationship between the bandwidth of a first signal and the bandwidth of a second signal, wherein the bandwidth of the first signal is greater than the bandwidth of the second signal. Correspondingly, the terminal device receives the aforementioned multiple first configuration information messages.

[0240] For an explanation of the first configuration information, please refer to the relevant description in Figure 4, which will not be elaborated here.

[0241] It is understood that the aforementioned multiple first configuration information can also be interpreted as multiple sets of parameters configured by the network device for the terminal device when transmitting signals based on the first transmission mode, such as configuring multiple truncation ratios. Optionally, the network device can configure one set of parameters at a time, or it can configure multiple sets of parameters at a time; this application does not limit this.

[0242] Optionally, the larger the truncation ratio (e.g., the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal), the greater the spectral efficiency of the second signal. For different truncation ratios, the bandwidth of the truncated signal (i.e., the bandwidth of the second signal) can be the same. Table 10 shows the relationship between the truncation ratio and the spectral efficiency of the second signal.

[0243] Table 10

[0244] As shown in Table 10, when the truncation ratio is 20%, the maximum spectral efficiency of the second signal is y. L When the truncation ratio is 40%, the maximum spectral efficiency of the second signal is z. M When the truncation ratio is 20%, the maximum spectral efficiency of the second signal is w. N It can be seen that as the truncation ratio increases, the maximum spectral efficiency of the second signal increases. When the truncation ratio is 0%, the bandwidth of the first signal can be considered equal to the bandwidth of the second signal.

[0245] In step 920, the terminal device sends second indication information and multiple second signals based on multiple first configuration information. Correspondingly, the network device receives the aforementioned second indication information and multiple second signals.

[0246] The aforementioned second indication information indicates multiple output power back-off amounts. These multiple output power back-off amounts represent the power required to be backed off when transmitting multiple second signals based on multiple first configuration information. Each of the multiple output power back-off amounts corresponds one-to-one with one of the multiple first configuration information. The spectral efficiency corresponding to the aforementioned multiple output power back-off amounts is the same.

[0247] One possible design is that the reporting format can be in absolute form, such as (OBO0, OFO1, OFO2, ...), where OFO0 represents the output power backoff of the untruncated waveform (i.e., the first signal is not truncated, or the bandwidth of the first signal is equal to the bandwidth of the second signal), OFO1 represents the output power backoff with a 20% truncation ratio, and so on. Each reported value corresponds to the same equivalent spectral efficiency. Another possible design is that the reporting format can be incremental, such as (OBO, ΔOBO1, ΔOBO2, ...), where OFO represents the output power backoff of the untruncated waveform, ΔOBO1 represents the increment of the output power backoff with a 20% truncation ratio compared to the untruncated waveform. The aforementioned truncation ratio refers to the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal.

[0248] Based on the aforementioned output power back-off amount, the network device can determine the target configuration information corresponding to the aforementioned spectral efficiency. This target configuration information is one of the aforementioned multiple first configuration information. Alternatively, based on the aforementioned output power back-off amount, the network device can determine a better waveform, or a better cutoff ratio, for the same spectral efficiency (or spectral efficiency range).

[0249] In one possible implementation, the network device determines a superior waveform for the same spectral efficiency based on the parameters of the received plurality of second signals and the corresponding output power back-off amounts of the second signals. This superior waveform corresponds one-to-one with the relationship (e.g., truncation ratio) between the bandwidth of the first signal and the bandwidth of the second signal. The criterion for determination can be, for example, optimal coverage performance for the same spectral efficiency. The parameters of the second signals include at least one of the following: received signal strength indicator (RSSI), reference signal received power (RSRP), reference signal receiving quality (RSRQ), signal-to-noise ratio (SNR), signal-to-interference plus noise ratio (SINR), or throughput.

[0250] In one possible implementation, the method 900 shown in FIG9 further includes: the network device sending third indication information indicating one or more radio frequency performance indicators for determining the at least one output power back-off amount.

[0251] Network devices indicate or protocol-predefined radio frequency performance metrics used to determine backoff, such as adjacent channel leakage ratio (ACLR), spectrum emission mask (SEM), or spurious emissions. ACLR measures the degree of leakage interference a signal causes in its adjacent channels. SEM defines the permissible transmit power level of a signal outside its operating frequency band. It is used to ensure that transmitted signals do not cause excessive interference to other frequency bands.

[0252] The terminal device determines and reports the output power back-off amount based on one or more of the above-mentioned radio frequency performance indicators.

[0253] In the method 900 described above, the network device can configure different relationships between the bandwidth of the first signal and the bandwidth of the second signal (such as different truncation ratios) for the terminal device. This allows the terminal device to send uplink signals based on these different relationships and provide feedback on their respective corresponding output power back-off amounts. This, in turn, facilitates the network device in determining a more optimal waveform based on the output power back-off amounts. For example, a smaller output power back-off amount results in a more optimal waveform and a wider coverage area.

[0254] Figure 10 is a schematic diagram of the coverage performance under different truncation ratios within the same spectral efficiency range provided in the embodiments of this application. In Figure 10, the horizontal axis represents spectral efficiency in (bps / Hz), and the vertical axis represents the signal-to-noise ratio. The truncation ratio can be understood, for example, as the ratio of the filtered signal to the first signal. Furthermore, the encoding method is π / 2-BPSK as an example, and the block error rate (BLER) is 10% as an example.

[0255] It's easy to understand that within the same spectral efficiency range, a lower SNR results in a larger coverage area and better coverage performance. Figure 10(a) shows the SNR of the transmitted signal under different conditions: no truncation of the first signal, a truncation ratio of 20%, a truncation ratio of 37.5%, and a truncation ratio of 50%. The figure shows that the waveform (or truncation ratio) with optimal coverage performance may differ across different spectral efficiency ranges. For example, in the spectral efficiency range [0.5, 0.75], a truncation ratio of 20% results in the lowest SNR and optimal coverage performance. Similarly, in the spectral efficiency range [1.5, 1.75], a truncation ratio of 50% also results in the lowest SNR and optimal coverage performance. Figure 10(b) shows the optimal waveform for different spectral efficiency ranges (i.e., the new waveform shown in the figure).

[0256] It should be noted that the order of the methods listed above does not imply the order of execution. The execution order of each process should be determined by its function and internal logic.

[0257] The signal transmission method of the embodiments of this application has been described in detail above. The communication device of the embodiments of this application will be described in detail below. The communication device includes modules or units for performing each part of the above embodiments. The modules or units may be software, hardware, or a combination of software and hardware. The following only provides a brief illustrative example of the communication device; for details of the implementation, please refer to the description of the foregoing method embodiments, which will not be repeated below.

[0258] Figure 11 is a schematic block diagram of a communication device 1100 provided in an embodiment of this application. As shown in Figure 11, the communication device 1100 includes a transceiver module 1102 and a processing module 1101.

[0259] In one possible implementation, the communication device 1100 is used to implement the steps corresponding to the terminal device (an example of the first communication device) in the method 400 described above.

[0260] The transceiver module 1102 is used to receive first configuration information, which is used to configure the relationship between the bandwidth of the first signal and the bandwidth of the second signal, wherein the bandwidth of the first signal is greater than the bandwidth of the second signal, and the first signal is a signal generated by the first communication device through transformation precoding; the processing module 1101 is used to determine the second signal based on the first configuration information; the transceiver module 1102 is also used to send the second signal.

[0261] Optionally, the relationship between the bandwidth of the first signal and the bandwidth of the second signal includes any one of the following: the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of the bandwidth of the second signal to the bandwidth of the first signal; the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of half the bandwidth of the second signal to the bandwidth of the first signal; or, the difference between the bandwidth of the first signal and the bandwidth of the second signal, wherein the filtered signal is the first signal excluding the second signal.

[0262] Optionally, the first configuration information described above is also used to configure at least one of the following: scheduling bandwidth, transmission bandwidth, MCS, filter type, or filter tap coefficients.

[0263] Optionally, the aforementioned scheduling bandwidth is the bandwidth allocated to the first communication device; the transmission bandwidth is the bandwidth used when transmitting the second signal.

[0264] Optionally, the aforementioned scheduling bandwidth and transmission bandwidth are characterized by the number of PRBs or TBSs.

[0265] Optionally, the above-mentioned MCS is based on an MCS index indication, which is an item in a first correspondence relationship. The first correspondence relationship is used to indicate the correspondence relationship of multiple MCS indices, multiple code rates, and multiple spectral efficiencies under the π / 2-BPSK modulation mode. The multiple code rates include at least one of the code rate corresponding to the first signal and the code rate corresponding to the second signal, and the multiple spectral efficiencies include at least one of the spectral efficiency corresponding to the first signal and the spectral efficiency corresponding to the second signal.

[0266] Optionally, the transceiver module 1102 is further configured to receive first indication information, which is used to instruct the first communication device to determine the MCS based on the first correspondence.

[0267] Optionally, the filter type and filter tap coefficients mentioned above are based on filter index indication, which is an item in a second correspondence indicating a correspondence between at least one filter index, at least one filter type, and at least one filter tap coefficient.

[0268] Optionally, the transceiver module 1102 is further configured to transmit capability information, which indicates at least one of the following: first information, maximum supported scheduling bandwidth, maximum supported transmission bandwidth, supported spectral efficiency range or supported filter frequency range, wherein the first information indicates the relationship between the bandwidth of the first signal and the bandwidth of the second signal supported by the first communication device.

[0269] Optionally, the transceiver module 1102 is further configured to receive a fourth indication information, which instructs the first communication device to transmit a signal using a first transmission mode, wherein the first transmission mode is a mode in which the bandwidth of the second signal is less than the bandwidth of the first signal.

[0270] In another possible implementation, the communication device 1100 is used to implement the steps corresponding to the network device (an example of the second communication device) in the method 400 described above.

[0271] Processing module 1101 is used to determine first configuration information, which is used to configure the relationship between the bandwidth of the first signal and the bandwidth of the second signal, wherein the bandwidth of the first signal is greater than the bandwidth of the second signal, and the first signal is a signal generated by the first communication device through transformation precoding; transceiver module 1102 is used to send the first configuration information; transceiver module 1102 is also used to receive the second signal based on the first configuration information.

[0272] Optionally, the relationship between the bandwidth of the first signal and the bandwidth of the second signal includes any one of the following: the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of the bandwidth of the second signal to the bandwidth of the first signal; the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of half the bandwidth of the second signal to the bandwidth of the first signal; or, the difference between the bandwidth of the first signal and the bandwidth of the second signal, wherein the filtered signal is the first signal excluding the second signal.

[0273] Optionally, the first configuration information described above is also used to configure at least one of the following: scheduling bandwidth, transmission bandwidth, MCS, filter type, or filter tap coefficients.

[0274] Optionally, the aforementioned scheduling bandwidth is the bandwidth allocated to the first communication device; the transmission bandwidth is the bandwidth used when transmitting the second signal.

[0275] Optionally, the aforementioned scheduling bandwidth and transmission bandwidth are characterized by the number of PRBs or TBSs.

[0276] Optionally, the above-mentioned MCS is based on an MCS index indication, which is an item in a first correspondence relationship. The first correspondence relationship is used to indicate the correspondence relationship of multiple MCS indices, multiple code rates, and multiple spectral efficiencies under the π / 2-BPSK modulation mode. The multiple code rates include at least one of the code rate corresponding to the first signal and the code rate corresponding to the second signal, and the multiple spectral efficiencies include at least one of the spectral efficiency corresponding to the first signal and the spectral efficiency corresponding to the second signal.

[0277] Optionally, the transceiver module 1102 is further configured to send first indication information, which is used to instruct the first communication device to determine the MCS based on the first correspondence.

[0278] Optionally, the filter type and filter tap coefficients mentioned above are based on a filter index indication, which is an item in a second correspondence indicating a correspondence between at least one filter index, at least one filter type, and at least one filter tap coefficient.

[0279] Optionally, the transceiver module 1102 is further configured to receive capability information, which indicates at least one of the following: first information, supported maximum scheduling bandwidth, supported maximum scheduling bandwidth, supported spectral efficiency range or supported filter frequency range, wherein the first information indicates the relationship between the bandwidth of the first signal and the bandwidth of the second signal supported by the first communication device.

[0280] In one possible implementation, the communication device 1100 is used to implement the steps corresponding to the terminal device (an example of the first communication device) in the method 900 described above.

[0281] The transceiver module 1102 is used to receive multiple first configuration information, each first configuration information being used to configure the relationship between the bandwidth of a first signal and the bandwidth of a second signal, wherein the bandwidth of the first signal is greater than the bandwidth of the second signal; the processing module 1101 is used to determine second indication information and multiple second signals based on the multiple first configuration information, wherein the second indication information indicates at least one output power back-off amount, the at least one output power back-off amount being the power required to back off when transmitting multiple second signals based on the multiple first configuration information, wherein the at least one output power back-off amount corresponds one-to-one with the multiple first configuration information, and the spectral efficiency corresponding to the at least one output power back-off amount is the same; the transceiver module 1102 is also used to transmit the multiple second signals and the second indication information.

[0282] Optionally, the relationship between the bandwidth of the first signal and the bandwidth of the second signal includes any one of the following: the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of the bandwidth of the second signal to the bandwidth of the first signal; the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of half the bandwidth of the second signal to the bandwidth of the first signal; or, the difference between the bandwidth of the first signal and the bandwidth of the second signal, wherein the filtered signal is the first signal other than the second signal.

[0283] Optionally, the first configuration information is also used to configure at least one of the following: scheduling bandwidth, transmission bandwidth, MCS, filter type, or filter tap coefficients.

[0284] In one possible implementation, the aforementioned scheduling bandwidth is the bandwidth allocated to the first communication device; the aforementioned transmission bandwidth is the bandwidth used when transmitting the second signal.

[0285] Optionally, the scheduling bandwidth and transmission bandwidth described above are characterized by the number of PRBs or TBS. This application does not limit this. The scheduling bandwidth and transmission bandwidth described above can also be characterized by other parameters, such as the number of modulation symbols.

[0286] Optionally, the above-mentioned MCS is based on an MCS index, which is an item in a first correspondence. The first correspondence is used to indicate the correspondence between multiple MCS indices, multiple code rates, and multiple spectral efficiencies under the π / 2-BPSK modulation scheme. The multiple code rates include at least one of the code rate corresponding to the first signal and the code rate corresponding to the second signal, and the multiple spectral efficiencies include at least one of the spectral efficiency corresponding to the first signal and the spectral efficiency corresponding to the second signal.

[0287] Optionally, the transceiver module 1102 is further configured to receive first indication information, which is used to instruct the first communication device to determine the MCS based on the first correspondence.

[0288] Optionally, the filter type and filter tap coefficients mentioned above are based on a filter index indication, which is an item in a second correspondence indicating a correspondence between at least one filter index, at least one filter type, and at least one filter tap coefficient.

[0289] Optionally, the transceiver module 1102 is further configured to transmit capability information, which indicates at least one of the following: first information, maximum supported scheduling bandwidth, maximum supported transmission bandwidth, supported spectral efficiency range or supported filter frequency range, wherein the first information indicates the relationship between the bandwidth of the first signal and the bandwidth of the second signal supported by the first communication device.

[0290] Optionally, the transceiver module 1102 is further configured to receive third indication information, which indicates one or more radio frequency performance indicators, which are used to determine the at least one output power back-off amount.

[0291] Optionally, the transceiver module 1102 is further configured to receive a fourth indication information, which instructs the first communication device to transmit a signal using a first transmission mode, wherein the first transmission mode is a mode in which the bandwidth of the second signal is less than the bandwidth of the first signal.

[0292] In one possible implementation, the communication device 1100 is used to implement the steps corresponding to the network device (an example of the second communication device) in the method 900 described above.

[0293] Processing module 1101 is used to determine multiple first configuration information, each first configuration information being used to configure the relationship between the bandwidth of a first signal and the bandwidth of a second signal, wherein the bandwidth of the first signal is greater than the bandwidth of the second signal; transceiver module 1102 is used to transmit the multiple first configuration information; transceiver module 1102 is also used to receive second indication information and multiple second signals, the second indication information indicating at least one output power back-off amount, the at least one output power back-off amount being the power required to back off when transmitting multiple second signals based on the multiple first configuration information, the at least one output power back-off amount corresponding one-to-one with the multiple first configuration information, and the spectral efficiency corresponding to the at least one output power back-off amount being the same; processing module 1101 determines target configuration information corresponding to the spectral efficiency based on the at least one output power back-off amount, the target configuration information being one of the multiple first configuration information.

[0294] Optionally, the relationship between the bandwidth of the first signal and the bandwidth of the second signal includes any one of the following: the ratio of the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of the bandwidth of the second signal to the bandwidth of the first signal; the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of half the bandwidth of the second signal to the bandwidth of the first signal; or, the difference between the bandwidth of the first signal and the bandwidth of the second signal, wherein the filtered signal is the first signal other than the second signal.

[0295] Optionally, the first configuration information described above is also used to configure at least one of the following: scheduling bandwidth, transmission bandwidth, MCS, filter type, or filter tap coefficients.

[0296] In one possible implementation, the aforementioned scheduling bandwidth is the bandwidth allocated to the first communication device; the aforementioned transmission bandwidth is the bandwidth used when transmitting the second signal.

[0297] In one possible implementation, the aforementioned scheduling bandwidth and transmission bandwidth are characterized by the number of PRBs or TBSs.

[0298] Optionally, the above-mentioned MCS is based on an MCS index, which is an item in a first correspondence. The first correspondence is used to indicate the correspondence between multiple MCS indices, multiple code rates, and multiple spectral efficiencies under the π / 2-BPSK modulation scheme. The multiple code rates include at least one of the code rate corresponding to the first signal and the code rate corresponding to the second signal, and the multiple spectral efficiencies include at least one of the spectral efficiency corresponding to the first signal and the spectral efficiency corresponding to the second signal.

[0299] Optionally, the transceiver module 1102 is further configured to send first indication information, which is used to instruct the first communication device to determine the MCS based on the first correspondence.

[0300] Optionally, the filter type and filter tap coefficients mentioned above are based on filter index indications, where the filter index is an item in a second correspondence indicating a correspondence between at least one filter index, at least one filter type, and at least one filter tap coefficient.

[0301] Optionally, the transceiver module 1102 is further configured to receive capability information, which indicates at least one of the following: first information, maximum supported scheduling bandwidth, maximum supported transmission bandwidth, supported spectral efficiency range or supported filter frequency range, wherein the first information indicates the relationship between the bandwidth of the first signal and the bandwidth of the second signal supported by the first communication device.

[0302] Optionally, the transceiver module 1102 is further configured to transmit third indication information, which indicates one or more radio frequency performance indicators, which are used to determine the at least one output power back-off amount.

[0303] Optionally, the transceiver module 1102 is further configured to send a fourth indication information, which instructs the first communication device to send a signal using a first transmission mode, wherein the first transmission mode is a mode in which the bandwidth of the second signal is less than the bandwidth of the first signal.

[0304] It should be understood that the communication device 1100 here is embodied in the form of a functional module. The term "module" here can refer to application-specific integrated circuits (ASICs), electronic circuits, processors (e.g., shared processors, proprietary processors, or group processors, etc.) and memories for executing one or more software or firmware programs, combined logic circuits, and / or other suitable components supporting the described functions. In an alternative example, those skilled in the art will understand that the communication device 1100 can specifically be a terminal device or network device as described in the above embodiments. The communication device 1100 can be used to execute the various processes and / or steps corresponding to the terminal device or network device in the above method embodiments; to avoid repetition, these will not be described again here.

[0305] The communication device 1100 described above has the function of implementing the corresponding steps performed by the terminal device or network device in the above method; the above functions can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. In the embodiments of this application, the communication device 1100 in FIG11 can also be a chip, such as a SoC.

[0306] It should be understood that the module division in the embodiments of this application is illustrative and only represents a logical functional division. In actual implementation, there may be other division methods. Furthermore, the functional modules in the various embodiments of this application can be integrated into a single processor, exist as separate physical entities, or be integrated into a single module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0307] Figure 12 is a schematic block diagram of another communication device 1200 provided in an embodiment of this application.

[0308] The communication device 1200 can be a chip system, or it can be an apparatus configured with a chip system to implement the methods described in the above-described method embodiments. In the embodiments of this application, the chip system can be composed of chips, or it can include chips and other discrete devices.

[0309] As shown in FIG12, the communication device 1200 may include a processor 1210, which can be used to execute computer programs or instructions in memory to implement the steps performed by the terminal device or network device in the embodiment shown in FIG4 or FIG9.

[0310] The communication device 1200 also includes a communication interface 1220. The communication interface 1220 can be used to communicate with other devices via a transmission medium, thereby enabling the communication device 1200 to communicate with other devices. The communication interface 1220 can be, for example, a transceiver, interface, pin, bus, circuit, or a device capable of transmitting and receiving functions. The processor 1210 can use the communication interface 1220 to input and output data and to implement the steps performed by the network device or terminal device in the embodiments shown in FIG4 or FIG9.

[0311] In one possible implementation, the communication device 1200 further includes at least one memory 1230 for storing program instructions and / or data. The memory 1230 is coupled to the processor 1210. The coupling in this embodiment is an indirect coupling or communication connection between devices, units, or modules, and can be electrical, mechanical, or other forms, used for information exchange between devices, units, or modules. The processor 1210 may operate in conjunction with the memory 1230. The processor 1210 may execute program instructions stored in the memory 1230. At least one of the at least one memory may be included in the processor.

[0312] It should be understood that the coupling in the embodiments of this application is an indirect coupling or communication connection between devices, units, or modules, which can be electrical, mechanical, or other forms, used for information interaction between devices, units, or modules. The processor 1210 may operate in conjunction with the memory 1230. The embodiments of this application do not limit the specific connection medium between the processor 1210, communication interface 1220, and memory 1230. Optionally, the processor 1210, communication interface 1220, and memory 1230 are connected via a bus 1240. The bus 1240 is represented by a thick line in Figure 12. The connection methods between other components are only illustrative and not intended to be limiting. The bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used in Figure 12, but this does not indicate that there is only one bus or one type of bus.

[0313] Figure 13 is a schematic diagram of the communication device provided in the embodiment of this application communicating.

[0314] As shown in Figure 13, terminal device 10 logically includes multiple parts, such as processor 101, memory 102, and transceiver 103. Transceiver 103 includes transmitter 1031, receiver 1032, and antenna 1033. Network device 20 logically includes multiple parts, such as processor 201, memory 202, and transceiver 203. Transceiver 203 includes transmitter 2031, receiver 2032, and antenna 2033. Receiver 1032 can be used to receive information sent by network device 20 through antenna 1033, and transmitter 1031 can be used to send information to network device 20 through antenna 1033. Transmitter 2031 can be used to send information to terminal device 10 through antenna 2033, and receiver 2032 can be used to receive information sent by terminal device 10 through antenna 2033.

[0315] For example, terminal device 10 can be used to implement the steps performed by terminal device in the method embodiment shown in FIG4 or FIG9, and network device 20 can be used to implement the steps performed by network device in the method embodiment shown in FIG4 or FIG9. More detailed descriptions can be directly referred to the relevant descriptions in the method embodiment shown in FIG4 or FIG9, which will not be repeated here.

[0316] Figure 14 is a schematic block diagram of the network element function division and protocol layer structure of the O-RAN device provided in the embodiments of this application.

[0317] In some examples, the control unit (CU) is a logical node that carries the Radio Resource Control (RRC) layer, Service Data Adaptation Protocol (SDAP) layer, Packet Data Convergence Protocol (PDCP) layer, and other control functions of the access network equipment. The CU connects to network nodes such as core network equipment through interfaces, which may be E2 interfaces, etc. Optionally, the CU may possess some of the functions of the core network equipment. The CU (e.g., the PDCP layer and higher layers) connects to distributed units (DUs) (e.g., the Radio Link Control (RLC) layer and lower layers) through interfaces, which may be F1 interfaces, etc. In some examples, these interfaces (e.g., the F1 interface) can provide control plane (CP) and user plane (UP) functions, such as interface management, system information management, UE context management, and RRC message transmission. F1AP is the application protocol of the F1 interface, defining the F1 signaling procedures in some examples. The F1 interface supports control plane F1-C and user plane F1-U.

[0318] In some examples, the CU can be split into CU-CP (control unit-control plane) and CU-UP (control unit-user plane). CU-CP is a logical node carrying the Radio Resource Control (RRC) layer and the PDCP-C (control plane part of PDCP) layer, used to implement the CU's control plane functions. CU-CP can interact with network elements in the core network used to implement control plane functions. These network elements in the core network can be Access and Mobility Function (AMF) elements, such as the Access and Mobility Management (AMF) function in a 5G system. AMF elements are responsible for mobility management in the mobile network, such as terminal device location updates, terminal device registration with the network, and terminal device handover. CU-UP is a logical node carrying the SDAP layer and the PDCP-U (user plane part of PDCP) layer, used to implement the CU's user plane functions. CU-UP can interact with network elements in the core network used to implement user plane functions. These network elements in the core network, such as the UPF (user plane function) in a 5G system, are responsible for data forwarding and receiving in terminal devices. The above CU and DU configurations are merely examples; the functions of the CU and DU can be configured as needed. For instance, the CU or DU can be configured to have more protocol layer functions, or only some protocol layer processing functions. For example, some RLC layer functions and protocol layer functions above the RLC layer can be placed in the CU, while the remaining RLC layer functions and protocol layer functions below the RLC layer can be placed in the DU. Furthermore, the functions of the CU or DU can be divided according to service type or other system requirements, such as by latency. Functions that require low latency can be placed in the DU, while functions that do not require low latency can be placed in the CU.

[0319] In some examples, a DU is a logical node that carries the RLC layer, MAC layer, higher physical layer (higher PHY) layer, and other functions. In some examples, a DU can control at least one RU. The DU connects to the RU through interfaces, which can be fronthaul interfaces. In some examples, the higher PHY layer includes the PHY layer processing, such as forward error correction (FEC) encoding and decoding, scrambling, modulation, and demodulation.

[0320] In some examples, the RU is a logical node carrying both lower physical layer (PHY) and radio frequency (RF) processing, also known as RF chain. In some examples, the RU can be a 3rd generation partnership project (3GPP) transmission reception point (TRP), a remote radio head (RRH), or other similar entities. In some examples, the low-PHY includes PHY processing functions such as fast Fourier transform (FFT), IFFT, digital beamforming, and filtering. The RU communicates with one or more UEs via a radio link.

[0321] The DU and RU may or may not be co-located. The DU and RU exchange control plane and user plane information via a lower-layer split-control, user, and synchronization (LLS-CUS) interface through a fronthaul link. LLS-CUS may include LLS-C and LLS-U interfaces, respectively providing the control plane and user plane. In some examples, the control plane refers to real-time control between the DU and RU. The DU and RU exchange management information via an LLS-M interface on the fronthaul link; the management plane (M-plane) refers to non-real-time management operations between the DU and RU.

[0322] DU and RU can cooperate to implement the functions of the PHY layer. A DU can be connected to one or more RUs. The functions of DU and RU can be configured in various ways depending on the design. For example, a DU can be configured to implement baseband functions, and an RU can be configured to implement mid-RF functions. Another example is that a DU can be configured to implement higher-level functions in the PHY layer, and an RU can be configured to implement lower-level functions in the PHY layer, or to implement both lower-level and RF functions. Higher-level functions in the physical layer can include a portion of the physical layer's functions that are closer to the MAC layer, while lower-level functions in the physical layer can include another portion of the physical layer's functions that are closer to the mid-RF side.

[0323] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, in an ORAN system, CU can also be called O-CU (open CU), DU can also be called O-DU, CU-CP can also be called O-CU-CP, CU-UP can also be called O-CU-UP, and RU can also be called O-RU. For ease of description, this application uses CU, CU-CP, CU-UP, DU, and RU as examples.

[0324] In the embodiment shown in Figure 4, step 410 can be implemented as follows: the DU corresponding to the network device sends the first configuration information through the RU. In one design, the first configuration information is sent through the radio resource control layer of the network device. In the O-RAN system, step 410 can be implemented as follows: the O-DU corresponding to the network device sends the aforementioned first configuration information through the O-RU.

[0325] Step 420 can be implemented as follows: the DU corresponding to the network device receives the second signal through the RU. In one design, the second signal can be received through the physical layer of the network device. In the O-RAN system, step 420 can be implemented as follows: the O-DU corresponding to the network device receives the aforementioned second signal through the O-RU.

[0326] In the embodiment shown in Figure 9, step 910 can be implemented as follows: the DU corresponding to the network device sends multiple first configuration information through the RU. In one design, the multiple first configuration information is sent through the radio resource control layer of the network device. In the O-RAN system, step 910 can be implemented as follows: the O-DU corresponding to the network device sends the aforementioned multiple first configuration information through the O-RU.

[0327] Step 920 can be implemented as follows: the DU corresponding to the network device receives the second indication information and multiple second signals through the RU. In one design, the second indication information and multiple second signals can be received through the physical layer of the network device. In the O-RAN system, step 920 can be implemented as follows: the O-DU corresponding to the network device receives the aforementioned second indication information and multiple second signals through the O-RU.

[0328] This application also provides a communication system including a network device and a terminal device as described above. In one possible implementation, the terminal device may, for example, implement the steps performed by the terminal device in the method shown in FIG4, and the network device may, for example, implement the steps performed by the network device in the method shown in FIG4; or, the terminal device may, for example, implement the steps performed by the terminal device in the method shown in FIG9, and the network device may, for example, implement the steps performed by the network device in the method shown in FIG9.

[0329] This application also provides a computer program product, which includes a computer program (also known as code or instructions) that, when run, can implement the steps performed by the network device or terminal device in the embodiments shown in FIG4 or FIG9.

[0330] This application also provides a computer-readable storage medium storing a computer program (also referred to as code or instructions). When the computer program is run, it can implement the steps performed by the network device or terminal device in the embodiments shown in FIG4 or FIG9.

[0331] It should be understood that the processor in the embodiments of this application can be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method embodiments can be completed by the integrated logic circuitry in the processor's hardware or by instructions in software form. The processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a microprocessor unit (MPU), a microcontroller unit (MCU), a graphics processing unit (GPU), an artificial intelligence processor (AI processor) or a neural processing unit (NPU), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or a combination of one or more discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module can reside in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0332] It should also be understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be a cache, random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0333] The terms "unit," "module," etc., used in this specification can be used to refer to computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution. In the embodiments of this application, "unit" and "module" have the same meaning and can be used interchangeably.

[0334] Those skilled in the art will recognize that the various illustrative logical blocks and steps described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application. In the several embodiments provided in this application, it should be understood that the disclosed apparatus, devices, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings or direct couplings or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0335] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0336] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0337] In the above embodiments, the functions of each functional unit can be implemented entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions (programs). When the computer program instructions (programs) are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs, DVDs), or semiconductor media (e.g., solid-state drives, SSDs), etc.

[0338] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the technology, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0339] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

A signal transmission method, characterized in that, Applied to a first communication device, the method includes: The system receives first configuration information, which is used to configure the relationship between the bandwidth of a first signal and the bandwidth of a second signal, wherein the bandwidth of the first signal is greater than the bandwidth of the second signal, and the first signal is a signal generated by the first communication device through transformation precoding. Based on the first configuration information, the second signal is sent. The method as described in claim 1, characterized in that, The relationship between the bandwidth of the first signal and the bandwidth of the second signal includes any one of the following: The ratio of the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of the bandwidth of the second signal to the bandwidth of the first signal; the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of half the bandwidth of the second signal to the bandwidth of the first signal; or, the difference between the bandwidth of the first signal and the bandwidth of the second signal, wherein the filtered signal is the first signal excluding the second signal. The method as described in claim 1 or 2, characterized in that, The first configuration information is also used to configure at least one of the following: scheduling bandwidth, transmission bandwidth, modulation and coding scheme (MCS), filter type, or filter tap coefficients. The method as described in claim 3, characterized in that, The scheduling bandwidth is the bandwidth allocated to the first communication device; the transmission bandwidth is the bandwidth used when transmitting the second signal. The method as described in claim 3 or 4, characterized in that, The scheduling bandwidth and the transmission bandwidth are characterized by the number of Physical Resource Blocks (PRBs) or the Transport Block Size (TBS). The method as described in any one of claims 3 to 5, characterized in that, The MCS is based on the MCS index indication, and the MCS index is an item in the first correspondence. The first correspondence is used to indicate the correspondence between multiple MCS indices, multiple code rates and multiple spectral efficiencies under the π / 2-binary phase shift keying (BPSK) modulation mode. The multiple code rates include at least one of the code rate corresponding to the first signal and the code rate corresponding to the second signal, and the multiple spectral efficiencies include at least one of the spectral efficiency corresponding to the first signal and the spectral efficiency corresponding to the second signal. The method as described in claim 6, characterized in that, The method further includes: Receive first indication information, the first indication information being used to instruct the first communication device to determine the MCS based on the first correspondence. The method as described in any one of claims 3 to 7, characterized in that, The filter type and filter tap coefficients are based on a filter index, which is an item in a second correspondence indicating a correspondence between at least one filter index, at least one filter type, and at least one filter tap coefficient. The method as described in any one of claims 1 to 8, characterized in that, The method further includes: The capability information is used to indicate at least one of the following: first information, maximum supported scheduling bandwidth, maximum supported transmission bandwidth, supported spectral efficiency range, or supported filter frequency range, wherein the first information is used to indicate the relationship between the bandwidth of the first signal and the bandwidth of the second signal supported by the first communication device. The method as described in any one of claims 1 to 9, characterized in that, The method further includes: The fourth indication information is received, which is used to instruct the first communication device to transmit a signal using a first transmission mode, wherein the first transmission mode is a mode in which the bandwidth of the second signal is less than the bandwidth of the first signal. A signal transmission method, characterized in that, Applied to a second communication device, the method includes: Send first configuration information, which is used to configure the relationship between the bandwidth of the first signal and the bandwidth of the second signal, wherein the bandwidth of the first signal is greater than the bandwidth of the second signal, and the first signal is a signal generated by the first communication device through transformation precoding. Based on the first configuration information, the second signal is received. The method as described in claim 11, characterized in that, The relationship between the bandwidth of the first signal and the bandwidth of the second signal includes any one of the following: The ratio of the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of the bandwidth of the second signal to the bandwidth of the first signal; the ratio of half the bandwidth of the filtered signal to the bandwidth of the first signal; the ratio of half the bandwidth of the second signal to the bandwidth of the first signal; or, the difference between the bandwidth of the first signal and the bandwidth of the second signal, wherein the filtered signal is the first signal excluding the second signal. The method as described in claim 11 or 12, characterized in that, The first configuration information is also used to configure at least one of the following: scheduling bandwidth, transmission bandwidth, modulation and coding scheme (MCS), filter type, or filter tap coefficients. The method as described in claim 13, characterized in that, The scheduling bandwidth is the bandwidth allocated to the first communication device; the transmission bandwidth is the bandwidth used when transmitting the second signal. The method as described in claim 13 or 14, characterized in that, The scheduling bandwidth and the transmission bandwidth are characterized by the number of Physical Resource Blocks (PRBs) or the Transport Block Size (TBS). The method as described in any one of claims 13 to 15, characterized in that, The MCS is based on the MCS index indication, and the MCS index is an item in the first correspondence. The first correspondence is used to indicate the correspondence between multiple MCS indices, multiple code rates and multiple spectral efficiencies under the π / 2-binary phase shift keying (BPSK) modulation mode. The multiple code rates include at least one of the code rate corresponding to the first signal and the code rate corresponding to the second signal, and the multiple spectral efficiencies include at least one of the spectral efficiency corresponding to the first signal and the spectral efficiency corresponding to the second signal. The method as described in claim 16, characterized in that, The method further includes: Send a first indication message, which is used to instruct the first communication device to determine the MCS based on the first correspondence. The method as described in any one of claims 13 to 17, characterized in that, The filter type and filter tap coefficients are based on a filter index, which is an item in a second correspondence indicating a correspondence between at least one filter index, at least one filter type, and at least one filter tap coefficient. The method as described in any one of claims 11 to 18, characterized in that, The method further includes: The capability information is used to indicate at least one of the following: first information, maximum supported scheduling bandwidth, maximum supported scheduling bandwidth, supported spectral efficiency range or supported filter frequency range, wherein the first information is used to indicate the relationship between the bandwidth of the first signal and the bandwidth of the second signal supported by the first communication device. The method as described in any one of claims 11 to 19, characterized in that, The method further includes: Send a fourth indication message, which is used to instruct the first communication device to send a signal using a first transmission mode, wherein the bandwidth of the second signal is less than the bandwidth of the first signal. A communication device, characterized in that, include: It includes modules for performing the method as described in any one of claims 1 to 10, or the method as described in any one of claims 11 to 20. A communication device, characterized in that, include: A processor, when invoked a computer program in memory, causes the apparatus to perform the method as described in any one of claims 1 to 10, or the method as described in any one of claims 11 to 20. A communication device, characterized in that, The device includes a processor and a transceiver, the transceiver being configured to receive information from other communication devices besides the communication device and to output information to other communication devices besides the communication device, the processor invoking a computer program stored in memory to execute the method as described in any one of claims 1 to 10, or the method as described in any one of claims 11 to 20. The communication device as described in claim 22 or 23 is characterized in that, The communication device also includes a memory. A computer-readable storage medium, characterized in that, Used to store computer programs, the computer programs including instructions for implementing the method as claimed in any one of claims 1 to 10, or the method as claimed in any one of claims 11 to 20. A computer program product, the computer program product comprising instructions, characterized in that, When the instructions are executed on a computer, the computer causes the computer to implement the method as described in any one of claims 1 to 10, or the method as described in any one of claims 11 to 20.

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