Method and device for determining bandwidth

Abstract

A bandwidth determination method and apparatus, the method comprising: when the maximum transmission bandwidth of a terminal is determined, the maximum transmission bandwidth of the terminal is associated with the type of the terminal, so that the maximum transmission bandwidth of the terminal is matched with the type of the terminal, and then the minimum protection bandwidth of the terminal is matched with the type of the terminal; therefore, the problems of waste of frequency domain resources and / or interference on other information transmitted in adjacent frequency domain resources caused by setting the maximum transmission bandwidth and the minimum protection bandwidth of all types of terminals as fixed values for a channel bandwidth can be solved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and in particular, to a method and device for determining bandwidth. Background Art

[0002] In new radio (NR) and long term evolution (LTE) systems, the maximum transmission bandwidth and minimum protection bandwidth defined within the channel bandwidth of the terminal are configured as fixed values. For example, for narrowband-internet of things (NB-IoT) terminals in LTE, the channel bandwidth of the terminal is defined as 200kHz. The protocol defines the maximum transmission bandwidth of the terminal as 180kHz within the 200kHz channel bandwidth, and defines a minimum protection bandwidth of 10kHz on both sides of the maximum transmission bandwidth.

[0003] For the ambient IoT (A-IoT) terminals that will be introduced in NR, different types of A-IoT terminals have different requirements for frequency error tolerance. For example, for A-IoT terminals based on backscattering, when the signal transmission bandwidth is about 180kHz, the maximum frequency error that can be tolerated is 7% of the signal transmission bandwidth, and the maximum frequency error that the signal can tolerate is about 10 to 15kHz. For active A-IoT terminals, the maximum value of the frequency error that can be tolerated by the active terminal is approximately equal to 5 to 10 parts per million (ppm), which is much larger than the maximum value of the frequency error that can be tolerated by the traditional NR active terminal of 0.1ppm. When the carrier center frequency is 900MHz, the frequency deviation tolerance of the active terminal is 9kHz (900MHz*10ppm). Because different types of A-IoT terminals can tolerate different frequency deviations and frequency deviation correction capabilities, the minimum protection bandwidth required is also different, and the corresponding maximum transmission bandwidth within the channel bandwidth is also different. How to configure the corresponding maximum transmission bandwidth for different types of A-IoT terminals, and then meet the maximum transmission efficiency of different types of A-IoT terminals is an urgent problem to be solved. Summary of the invention

[0004] The embodiments of the present application provide a method and apparatus for determining bandwidth, so as to determine the maximum transmission bandwidth of different types of terminals.

[0005] In a first aspect, a method for determining bandwidth is provided, wherein the executor of the method is a terminal, or a unit in the terminal (such as a chip or circuit, etc.), comprising: determining a maximum transmission bandwidth of the terminal under a first channel bandwidth and a first subcarrier spacing, wherein the maximum transmission bandwidth of the terminal is associated with the type of the terminal under the first channel bandwidth and the first subcarrier spacing, and the first channel bandwidth includes a maximum transmission bandwidth and a minimum protection bandwidth; and transmitting signals with an access network device according to the maximum transmission bandwidth of the terminal.

[0006] It can be understood that in the description of this article, for a terminal capable of generating an uplink carrier signal, its frequency error is a carrier frequency error, while for a terminal capable of reflecting a downlink carrier signal but not generating an uplink carrier signal, its frequency error is a signal frequency error.

[0007] In the description of this article, a terminal that has the ability to reflect downlink carrier signals but does not have the ability to generate uplink carrier signals can also be referred to as a terminal that only has the ability to reflect downlink carrier signals, a terminal that does not have the ability to generate uplink carrier signals, a terminal that does not have the ability to generate uplink carrier signals, or a terminal that only has backscattering capability.

[0008] In the description of this document, a terminal capable of generating an uplink carrier signal may also be referred to as a terminal capable of generating an uplink carrier signal.

[0009] Through the above design, different types of terminals have different requirements for the maximum value of the frequency error they tolerate. According to the type of terminal, determine the maximum transmission bandwidth that matches the maximum value of the frequency error it tolerates. For example, for a terminal with a looser maximum frequency error requirement (i.e., a larger maximum frequency error value), it is necessary to configure a larger minimum protection bandwidth and a smaller maximum transmission bandwidth. Accordingly, the terminal has a poorer ability to calibrate the frequency error. For a terminal with a stricter maximum frequency error tolerance requirement (i.e., a smaller maximum frequency error value), it is necessary to configure a smaller minimum protection bandwidth and a larger maximum transmission bandwidth. Accordingly, the terminal has a stronger ability to calibrate the frequency error.

[0010] In one design, the types of terminals include: a terminal capable of generating an uplink carrier signal, or a terminal capable of reflecting a downlink carrier signal but not capable of generating an uplink carrier signal (e.g., a backscatter terminal). Further, the terminal capable of generating an uplink carrier signal includes a terminal having a maximum frequency error equal to X (e.g., a conventional terminal), and a terminal having a maximum frequency error greater than X (e.g., an active A-IoT terminal). X is a non-negative number, for example, the value of X is equal to 0.1 parts per million ppm.

[0011] Optionally, a terminal capable of generating an uplink carrier signal has stricter requirements on the maximum value of the frequency error than a terminal capable of reflecting a downlink carrier signal but not capable of generating an uplink carrier signal. Therefore, under the same terminal channel bandwidth and subcarrier spacing, the maximum transmission bandwidth corresponding to the terminal capable of generating an uplink carrier signal is greater than the maximum transmission bandwidth corresponding to the terminal capable of reflecting a downlink carrier signal but not capable of generating an uplink carrier signal.

[0012] Through the above design, different maximum transmission bandwidth configurations are defined for different types of A-IoT terminals under the same channel bandwidth, so that each type or capability of A-IoT terminal can maximize its transmission efficiency and minimize the interference of signal transmission caused by frequency error to other terminal transmissions.

[0013] Optionally, the smaller the maximum value of the frequency error is, the stronger its ability to calibrate the frequency deviation is, and a larger transmission bandwidth needs to be configured. Therefore, in one design, for a terminal capable of generating an uplink carrier, the maximum transmission bandwidth corresponding to the terminal whose maximum value of the frequency error is equal to X is greater than the maximum transmission bandwidth corresponding to the terminal whose maximum value of the frequency error is greater than X.

[0014] In one design, the maximum transmission bandwidth of the terminal includes a maximum downlink transmission bandwidth of the terminal and a maximum uplink transmission bandwidth of the terminal, and the maximum uplink transmission bandwidth of the terminal is greater than the maximum downlink transmission bandwidth of the terminal.

[0015] Through the above design, since the terminal first receives the downlink signal when accessing the network, the downlink signal can be a synchronization signal or other broadcast signal. After receiving the downlink signal, the terminal can perform frequency error calibration according to the downlink signal. After the frequency error calibration, the maximum value of the frequency error of the terminal will become smaller. Therefore, compared with the downlink, the uplink can support a larger maximum transmission bandwidth. In this design, the uplink maximum transmission bandwidth is greater than the downlink maximum transmission bandwidth. Compared with configuring the uplink maximum transmission bandwidth and the downlink maximum transmission bandwidth to be the same, the utilization rate of the uplink resources can be improved.

[0016] The second aspect is the counterpart corresponding to the first aspect. The beneficial effects can be found in the description of the first aspect. A method for determining bandwidth is provided. The execution subject of the method is an access network device, or a unit (chip or circuit, etc.) in the access network device, including: determining the maximum transmission bandwidth of the terminal under the first channel bandwidth and the first subcarrier spacing. Under the first channel bandwidth and the first subcarrier spacing, the maximum transmission bandwidth of the terminal is associated with the type of the terminal, and the first channel bandwidth includes the maximum transmission bandwidth and the minimum protection bandwidth; and transmitting signals with the terminal according to the maximum transmission bandwidth of the terminal.

[0017] In one design, the types of terminals include: a terminal capable of generating an uplink carrier signal or a terminal capable of reflecting a downlink carrier signal but not capable of generating an uplink carrier signal. Further, the terminal capable of generating an uplink carrier signal includes a terminal having a maximum frequency error equal to X, and a terminal having a maximum frequency error greater than X. X is a non-negative number, for example, the value of X is equal to 0.1 ppm.

[0018] In one design, the maximum transmission bandwidth corresponding to a terminal capable of generating an uplink carrier signal is greater than the maximum transmission bandwidth corresponding to a terminal capable of reflecting a downlink carrier signal but not capable of generating an uplink carrier signal. For different types of A-IoT terminals, different maximum transmission bandwidth configurations are defined under the same channel bandwidth, so that each type or capability of A-IoT terminal can maximize its transmission efficiency and avoid interference caused by frequency error in signal transmission to other terminal transmissions.

[0019] In one design, the maximum transmission bandwidth corresponding to a terminal whose maximum frequency error is equal to X is greater than the maximum transmission bandwidth corresponding to a terminal whose maximum frequency error is greater than X.

[0020] In one design, the maximum transmission bandwidth of the terminal includes a maximum downlink transmission bandwidth of the terminal and a maximum uplink transmission bandwidth of the terminal, and the maximum uplink transmission bandwidth of the terminal is greater than the maximum downlink transmission bandwidth of the terminal.

[0021] In one design, the maximum transmission bandwidth and the minimum protection bandwidth of the terminal are associated with the frequency band in which the terminal is located. The higher the corresponding frequency value of the frequency band, the smaller the maximum transmission bandwidth of the terminal and the larger the minimum protection bandwidth. Optionally, the minimum protection bandwidth is proportional to the carrier frequency, the carrier center frequency, the frequency band start frequency, or the frequency band cutoff frequency.

[0022] According to a third aspect, a method for determining bandwidth is provided, wherein the execution subject of the method is a terminal, or a unit (chip or circuit, etc.) in the terminal, comprising: sending a first uplink signal to an access network device on a first uplink channel; sending a second uplink signal to the access network device on a second uplink channel, wherein the maximum signal bandwidth of the second uplink signal is greater than the maximum signal bandwidth of the first uplink signal.

[0023] Optionally, the above maximum signal bandwidth may also be referred to as a configurable maximum signal bandwidth, a configurable maximum signal bandwidth, an indicative maximum signal bandwidth, or an indicative maximum signal bandwidth, etc. In addition, the maximum signal bandwidth may also be referred to as a maximum signal bandwidth in a configurable maximum signal bandwidth set or a maximum signal bandwidth in an indicative maximum signal bandwidth set.

[0024] Optionally, the modulation mode of the first uplink signal and the second uplink signal may be on-off keying (OOK), amplitude shift keying (ASK), frequency shift keying (FSK), or binary phase shift keying (BPSK) modulation.

[0025] Through the above design, the maximum signal bandwidths of different uplink signal configurations are not the same. For example, the terminal first sends the first uplink signal and then sends the second uplink signal. The maximum signal bandwidth of the second uplink signal configuration is greater than the maximum signal bandwidth of the first uplink signal configuration. Compared with the design in which the maximum signal bandwidth of the second uplink signal configuration is the same as the maximum signal bandwidth of the first uplink signal configuration, the transmission efficiency and frequency domain resource utilization of uplink transmissions of different uplink channels and different uplink signals at different uplink transmission stages can be improved.

[0026] In one design, the maximum value of the frequency error of the first uplink signal is a first value, the maximum value of the frequency error of the second uplink signal is a second value, and the second value is smaller than the first value.

[0027] In one design, the method further includes: receiving a first downlink signal from an access network device on a first downlink channel, wherein the first downlink signal includes frequency adjustment information. For example, sending a second uplink signal to the access network device on a second uplink channel includes: performing frequency adjustment according to the frequency adjustment information; and sending a second uplink signal to the access network device on the second uplink channel.

[0028] In one design, the first uplink signal is a signal carrying message 1 in the random access process, and the second uplink signal is a signal carrying message 3 in the random access process or a signal after message 3. The first uplink channel is a physical random access channel PRACH, and the second uplink channel is a physical uplink shared channel PUSCH or a physical uplink control channel PUCCH.

[0029] Through the above design, the frequency correction is performed by using the signal in the first step PRACH of random access as a reference signal, which can further improve the transmission efficiency and frequency domain resource utilization of subsequent message 3 and subsequent data transmission.

[0030] In one design, the first uplink signal is a signal carrying message 3 in the random access process, and the second uplink signal is a signal after message 3, such as an uplink signal carrying a positive acknowledgement (ACK) or a negative acknowledgement (NACK) of message 4 or an uplink signal carrying message 5. The first uplink channel is a physical uplink shared channel PUSCH. When the second uplink signal is an uplink signal carrying message 4, the second uplink channel is a physical uplink control channel PUCCH. When the second uplink signal is an uplink signal carrying message 5, the second uplink channel is a physical uplink shared channel PUSCH.

[0031] In the above design, by adjusting the frequency of short message transmission during random access, the transmission efficiency and frequency domain resource utilization can be further improved when an uplink signal with a longer signal duration is subsequently transmitted.

[0032] In one design, the first uplink signal is a synchronization signal or a reference signal, and the second uplink signal is a signal carrying uplink data information, or a signal carrying uplink control information. The synchronization signal or reference signal is a synchronization signal or a reference signal of the second uplink signal, or can be referred to as the synchronization signal or the reference signal being associated with the second uplink signal, and the synchronization signal or the reference signal is used for time synchronization between the access network device and the terminal. The first uplink channel is PUSCH, and the second uplink channel is PUSCH or PUCCH.

[0033] Through the above design, by detecting and adjusting the frequency of a reference signal or synchronization signal with a shorter transmission duration, the transmission efficiency and frequency domain resource utilization can be further improved when an uplink data signal with a longer transmission duration is subsequently transmitted.

[0034] In one design, the method further includes: determining the maximum signal bandwidth of the first uplink signal and the maximum signal bandwidth of the second uplink signal of the terminal according to the type of the terminal. For example, determining the maximum transmission bandwidth of the terminal according to the type of the terminal, the maximum signal bandwidth of the first uplink signal and the maximum signal bandwidth of the second uplink signal are less than or equal to the maximum transmission bandwidth of the terminal.

[0035] In one design, the types of terminals include: a terminal capable of generating an uplink carrier signal or a terminal capable of reflecting a downlink carrier signal but not capable of generating an uplink carrier signal. Further, the terminal capable of generating an uplink carrier signal includes a terminal having a maximum frequency error equal to X, and a terminal having a maximum frequency error greater than X. X is a non-negative number, for example, the value of X is equal to 0.1 ppm.

[0036] In one design, it also includes: sending a message to the access network device, wherein the message includes the type of the terminal.

[0037] The fourth aspect is the counterpart corresponding to the third aspect. The beneficial effects can be found in the description of the third aspect. A method for determining bandwidth is provided. The executor of the method is an access network device, or a unit (module or circuit, etc.) in the access network device, including: receiving a first uplink signal from a terminal on a first uplink channel; receiving a second uplink signal from the terminal on a second uplink channel, and the maximum signal bandwidth of the second uplink signal is greater than the maximum signal bandwidth of the first uplink signal.

[0038] Optionally, the above maximum signal bandwidth may also be referred to as a configurable maximum signal bandwidth, a configurable maximum signal bandwidth, an indicative maximum signal bandwidth, or an indicative maximum signal bandwidth, etc. In addition, the maximum signal bandwidth may also be referred to as a maximum signal bandwidth in a configurable maximum signal bandwidth set or a maximum signal bandwidth in an indicative maximum signal bandwidth set.

[0039] Optionally, the modulation mode of the first uplink signal and the second uplink signal may be on-off keying (OOK), amplitude shift keying (ASK), frequency shift keying (FSK), or binary phase shift keying (BPSK) modulation.

[0040] In one design, the maximum value of the frequency error of the first uplink signal is a first value, the maximum value of the frequency error of the second uplink signal is a second value, and the second value is smaller than the first value.

[0041] In one design, the method further includes: sending a first downlink signal to the terminal on a first downlink channel, wherein the first downlink signal includes frequency adjustment information.

[0042] In one design, the first uplink signal is a signal carrying message 1 in the random access process, and the second uplink signal is a signal carrying message 3 in the random access process or after message 3. The first uplink channel is a physical random access channel PRACH, and the second uplink channel is a physical uplink shared channel PUSCH or a physical uplink control channel PUCCH.

[0043] In one design, the first uplink signal is a signal carrying message 3 in the random access process, and the second uplink signal is a signal after message 3, such as an uplink signal carrying a positive acknowledgment ACK or a negative acknowledgment NACK of message 4 or an uplink signal carrying message 5. The first uplink channel is a physical uplink shared channel PUSCH. When the second uplink signal is an uplink signal carrying message 4, the second uplink channel is a physical uplink control channel PUCCH. When the second uplink signal is an uplink signal carrying message 5, the second uplink channel is a physical uplink shared channel PUCCH.

[0044] In one design, the first uplink signal is a synchronization signal or a reference signal, and the second uplink signal is a signal carrying uplink data information, or a signal carrying uplink control information. The synchronization signal or reference signal is a synchronization signal or a reference signal of the second uplink signal, or can be referred to as the synchronization signal or the reference signal being associated with the second uplink signal, and the synchronization signal or the reference signal is used for time synchronization between the access network device and the terminal. The first uplink channel is PUSCH, and the second uplink channel is PUSCH or PUCCH.

[0045] In one design, the method further includes: determining the maximum signal bandwidth of the first uplink signal and the maximum signal bandwidth of the second uplink signal of the terminal according to the type of the terminal. For example, determining the maximum transmission bandwidth of the terminal according to the type of the terminal, the maximum signal bandwidth of the first uplink signal and the maximum signal bandwidth of the second uplink signal are less than or equal to the maximum transmission bandwidth of the terminal.

[0046] In one design, the types of terminals include: a terminal capable of generating an uplink carrier signal or a terminal capable of reflecting a downlink carrier signal but not capable of generating an uplink carrier signal. Further, the terminal capable of generating an uplink carrier signal includes a terminal having a maximum frequency error equal to X, and a terminal having a maximum frequency error greater than X. X is a non-negative number, for example, the value of X is equal to 0.1 ppm.

[0047] In one design, the method further includes: receiving a message from a terminal, wherein the message includes the type of the terminal.

[0048] In a fifth aspect, a method for determining bandwidth is provided, wherein the executor of the method is a terminal, or a unit (chip or circuit, etc.) in the terminal, comprising: receiving a first downlink signal from an access network device on a first downlink channel; receiving a second downlink signal from the access network device on a second downlink channel, wherein the maximum signal bandwidth of the second downlink signal is greater than the maximum signal bandwidth of the first downlink signal.

[0049] Optionally, the modulation mode of the first downlink signal and the second downlink signal is on-off keying (OOK), amplitude shift keying (ASK) or frequency shift keying (FSK) modulation.

[0050] Through the above design, the maximum signal bandwidth configured for different downlink signals is not the same. For example, the access network device first sends a first downlink signal to the terminal. Since the terminal can adjust the frequency according to the first downlink signal when receiving the first downlink signal, the maximum value of the frequency error of the terminal will become smaller. Therefore, thereafter, the second downlink signal sent by the access network device to the terminal can support a larger maximum signal bandwidth. Compared with configuring the same maximum signal bandwidth for downlink signals, the transmission efficiency and frequency domain resource utilization of different downlink transmission stages, different downlink channels, and different downlink signals can be improved. In particular, when the downlink uses a low-power, low-spectral-efficiency modulation method, increasing the effective signal bandwidth can more effectively improve the transmission efficiency.

[0051] In one design, the maximum value of the frequency error of the first downlink signal is a first value, the maximum value of the frequency error of the second downlink signal is a second value, and the second value is smaller than the first value.

[0052] In one design, it also includes: the terminal performing frequency correction according to the first downlink signal.

[0053] In one design, the first downlink signal is used for at least one of: time synchronization, frequency synchronization, or carrying system messages, and the second downlink signal includes: a signal carrying downlink data information, or a signal carrying downlink control information. The first downlink channel includes a physical broadcast channel PBCH, and the second downlink channel includes a physical downlink shared channel PDSCH or a physical downlink control channel PDCCH.

[0054] Under the above design, by calibrating the frequency error of the existing common signals that can be used for periodic transmission, the transmission efficiency and frequency domain resource utilization can be further improved when the downlink data signals and control signals are subsequently transmitted.

[0055] In one design, the first downlink signal is a synchronization signal or a reference signal, and the synchronization signal or the reference signal is used for time synchronization between the terminal and the access network device, and the second downlink signal is a signal carrying downlink data information or carrying downlink control information. The synchronization signal or the reference signal is a synchronization signal or a reference signal of the second downlink signal. The first downlink channel is PDSCH, and the second downlink channel is PDSCH or PDCCH.

[0056] In the above design, by calibrating the frequency error of the existing common frequency that can be sent together with the data signal, the transmission efficiency and frequency domain resource utilization can be further improved when the downlink data signal and the control signal are subsequently sent.

[0057] In one design, the method further includes: determining a maximum signal bandwidth of a first downlink signal and a maximum signal bandwidth of a second downlink signal of the terminal according to the type of the terminal. For example, determining a maximum transmission bandwidth of the terminal according to the type of the terminal, wherein the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the second downlink signal are less than or equal to the maximum transmission bandwidth of the terminal.

[0058] In one design, the types of terminals include: a terminal capable of generating an uplink carrier signal or a terminal capable of reflecting a downlink carrier signal but not capable of generating an uplink carrier signal. Further, the terminal capable of generating an uplink carrier signal includes a terminal having a maximum frequency error equal to X, and a terminal having a maximum frequency error greater than X. X is a non-negative number, for example, the value of X is equal to 0.1 ppm.

[0059] In one design, it also includes: sending a message to the access network device, wherein the message includes the type of the terminal.

[0060] The sixth aspect is the counterpart corresponding to the fifth aspect. The beneficial effects can be found in the description of the fifth aspect. A method for determining bandwidth is provided. The executor of the method is an access network device, or a unit (chip or circuit, etc.) in the access network device, including: sending a first downlink signal to the terminal on a first downlink channel; sending a second downlink signal to the terminal on a second downlink channel, and the maximum signal bandwidth of the second downlink signal is greater than the maximum signal bandwidth of the first downlink signal.

[0061] Optionally, the modulation mode of the first downlink signal and the second downlink signal is on-off keying (OOK), amplitude shift keying (ASK) or frequency shift keying (FSK) modulation.

[0062] In one design, the maximum value of the frequency error of the first downlink signal is a first value, the maximum value of the frequency error of the second downlink signal is a second value, and the second value is smaller than the first value.

[0063] In one design, the modulation mode of the first downlink signal and the second downlink signal is on-off keying (OOK), amplitude shift keying (ASK), or frequency shift keying (FSK) modulation.

[0064] In one design, the first downlink signal is used for at least one of: time synchronization, frequency synchronization, or carrying system messages, and the second downlink signal includes: a signal carrying downlink data information, or a signal carrying downlink control information. The first downlink channel includes a physical broadcast channel PBCH, and the second downlink channel includes a physical downlink shared channel PDSCH or a physical downlink control channel PDCCH.

[0065] In one design, the first downlink signal is a synchronization signal or a reference signal, and the synchronization signal or the reference signal is used for time synchronization between the terminal and the access network device, and the second downlink signal is a signal that carries downlink data information or carries downlink control information. The synchronization signal or the reference signal is a synchronization signal or a reference signal of the second downlink signal. The first downlink channel is PDSCH, and the second downlink channel is PDSCH or PDCCH. In one design, it also includes: determining the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the second downlink signal of the terminal according to the type of the terminal. For example, according to the type of the terminal, the maximum transmission bandwidth of the terminal is determined, and the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the second downlink signal are less than or equal to the maximum transmission bandwidth of the terminal.

[0066] In one design, the types of terminals include: a terminal capable of generating an uplink carrier signal or a terminal capable of reflecting a downlink carrier signal but not capable of generating an uplink carrier signal. Further, the terminal capable of generating an uplink carrier signal includes a terminal having a maximum frequency error equal to X, and a terminal having a maximum frequency error greater than X. X is a non-negative number, for example, the value of X is equal to 0.1 ppm.

[0067] In one design, the method further includes: receiving a message from a terminal, wherein the message includes the type of the terminal.

[0068] In the seventh aspect, a method for determining bandwidth is provided, wherein the executor of the method is a terminal, or a unit (chip or circuit, etc.) in the terminal, comprising: receiving a first downlink signal from an access network device on a first downlink channel; sending a first uplink signal to the access network device on a first uplink channel; the maximum signal bandwidth of the first uplink signal is greater than the maximum signal bandwidth of the first downlink signal.

[0069] Optionally, the modulation mode of the first downlink signal is on-off keying OOK, amplitude shift keying ASK or frequency shift keying FSK modulation. The modulation mode of the first uplink signal is on-off keying OOK, amplitude shift keying ASK, frequency shift keying FSK or binary phase keying BPSK modulation.

[0070] Through the above design, the maximum signal bandwidths configured for the uplink signal and the downlink signal are different. For example, the maximum signal bandwidth of the uplink signal is greater than the maximum signal bandwidth of the downlink signal. Compared with configuring the same maximum signal bandwidth for the uplink signal and the downlink signal, the uplink signal transmission efficiency and the utilization rate of the frequency domain resources can be improved.

[0071] In one design, the maximum value of the frequency error of the first downlink signal is a first value, the maximum value of the frequency error of the first uplink signal is a second value, and the second value is smaller than the first value.

[0072] In one design, it also includes: performing frequency correction based on the first downlink signal.

[0073] In one design, the first downlink signal is a synchronization signal, a signal carrying a system message, a downlink data signal, or a downlink control signal, etc., and the first uplink signal can be a random access preamble, an uplink data signal, or an uplink control signal. Optionally, the first downlink channel can be a PBCH, a PDCCH, or a PDSCH, etc., and the first uplink channel can be a PRACH, a PUSCH, or a PUCCH, etc.

[0074] In one design, the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the first uplink signal may be determined according to the type of the terminal. For example, in one implementation, the maximum transmission bandwidth of the terminal may be determined according to the type of the terminal. The maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the first uplink signal are less than or equal to the maximum transmission bandwidth of the terminal.

[0075] In one design, the types of terminals include: a terminal capable of generating an uplink carrier signal or a terminal capable of reflecting a downlink carrier signal but not capable of generating an uplink carrier signal. Further, the terminal capable of generating an uplink carrier signal includes a terminal having a maximum frequency error equal to X, and a terminal having a maximum frequency error greater than X. X is a non-negative number, for example, the value of X is equal to 0.1 ppm.

[0076] In one design, it also includes: sending a message to the access network device, wherein the message includes the type of the terminal.

[0077] In the eighth aspect, for the counterpart corresponding to the seventh aspect, the beneficial effects can be found in the description of the seventh aspect, and a method for determining bandwidth is provided, wherein the execution subject of the method is an access network device, or a unit (chip or circuit, etc.) in the access network device, including: sending a first downlink signal to a terminal on a first downlink channel. Receiving a first uplink signal from the terminal on a first uplink channel. The maximum signal bandwidth corresponding to the first uplink signal is greater than the maximum signal bandwidth corresponding to the first downlink signal.

[0078] Optionally, the modulation mode of the first downlink signal is on-off keying OOK, amplitude shift keying ASK or frequency shift keying FSK modulation. The modulation mode of the first uplink signal is on-off keying OOK, amplitude shift keying ASK, frequency shift keying FSK or binary phase keying BPSK modulation.

[0079] In one design, the maximum value of the frequency error of the first downlink signal is a first value, the maximum value of the frequency error of the first uplink signal is a second value, and the second value is smaller than the first value.

[0080] In one design, the first downlink signal is a synchronization signal, a signal carrying a system message, a downlink data signal, or a downlink control signal, etc., and the first uplink signal can be a random access preamble, an uplink data signal, or an uplink control signal. Optionally, the first downlink channel can be a PBCH, a PDCCH, or a PDSCH, etc., and the first uplink channel can be a PRACH, a PUSCH, or a PUCCH, etc.

[0081] In one design, the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the first uplink signal may be determined according to the type of the terminal. For example, in one implementation, the maximum transmission bandwidth of the terminal may be determined according to the type of the terminal. The maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the first uplink signal are less than or equal to the maximum transmission bandwidth of the terminal.

[0082] In one design, the types of terminals include: a terminal capable of generating an uplink carrier signal or a terminal capable of reflecting a downlink carrier signal but not capable of generating an uplink carrier signal. Further, the terminal capable of generating an uplink carrier signal includes a terminal having a maximum frequency error equal to X, and a terminal having a maximum frequency error greater than X. X is a non-negative number, for example, the value of X is equal to 0.1 ppm.

[0083] In one design, the method further includes: receiving a message from a terminal, wherein the message includes the type of the terminal.

[0084] In a ninth aspect, a device is provided, which can implement the method of the first aspect, the third aspect, the fifth aspect or the seventh aspect. For example, the device includes means corresponding to the first aspect, the third aspect, the fifth aspect or the seventh aspect. The device can be implemented by hardware, software or by executing the corresponding software implementation by hardware.

[0085] In one design, the apparatus includes a unit that performs the first, third, fifth, or seventh aspects described above.

[0086] In one design, the apparatus includes a processor configured to execute the method of the first, third, fifth, or seventh aspect described above.

[0087] In one design, the device includes a processor and an interface circuit, the interface circuit is used to receive signals from other devices outside the device and transmit them to the processor or send signals from the processor to other devices outside the device, and the processor is used to implement the methods of the first, third, fifth or seventh aspects above through logic circuits or execution code instructions.

[0088] In one design, the device includes a processor and a memory, and the processor is used to execute a computer program or instruction stored in the memory so that the device implements the method of the first aspect, the third aspect, the fifth aspect or the seventh aspect mentioned above.

[0089] In a tenth aspect, a device is provided, which can implement the method of the second aspect, the fourth aspect, the sixth aspect or the eighth aspect. For example, the device includes means corresponding to the second aspect, the fourth aspect, the sixth aspect or the eighth aspect. The device can be implemented by hardware, software or by executing the corresponding software implementation by hardware.

[0090] In one design, the apparatus includes a unit that performs the second, fourth, sixth, or eighth aspects described above.

[0091] In one design, the apparatus includes a processor configured to execute the method of the second, fourth, sixth or eighth aspect described above.

[0092] In one design, the device includes a processor and an interface circuit, the interface circuit is used to receive signals from other devices outside the device and transmit them to the processor or send signals from the processor to other devices outside the device, and the processor is used to implement the methods in the second, fourth, sixth or eighth aspects above through logic circuits or execution code instructions.

[0093] In one design, the device includes a processor and a memory, and the processor is used to execute a computer program or instructions stored in the memory, so that the device implements the method of the second aspect, the fourth aspect, the sixth aspect or the eighth aspect mentioned above.

[0094] In the eleventh aspect, a computer-readable storage medium is provided, storing a computer program or instruction. When the computer program or instruction is executed on a computer, the computer implements the method of any one of the first to eighth aspects.

[0095] In a twelfth aspect, a computer program product is provided, comprising a computer program or instructions, which, when executed by a computer, enables the method of any one of the first to eighth aspects to be executed.

[0096] In the thirteenth aspect, a chip is provided, comprising a processor, wherein the processor is coupled to a memory and is used to execute a computer program or instruction stored in the memory, so that the chip implements the method of any one of the first to eighth aspects above.

[0097] In the fourteenth aspect, a communication system is provided, comprising: a first device and a second device; wherein the first device is used to implement the method of the first aspect, and the second device is used to implement the method of the second aspect; or, the first device is used to implement the method of the third aspect, and the second device is used to implement the method of the fourth aspect; or, the first device is used to implement the method of the fifth aspect, and the second device is used to implement the method of the sixth aspect; or, the first device is used to implement the method of the seventh aspect, and the second device is used to implement the method of the eighth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0098] Figure 1 A schematic diagram of a communication system provided in an embodiment of the present application;

[0099] Figure 2 A schematic diagram of a process provided in an embodiment of the present application;

[0100] Figure 3 Another schematic diagram of the process provided by the embodiment of the present application;

[0101] Figure 4 Another schematic diagram of the process provided in the embodiment of the present application;

[0102] Figure 5 Another schematic diagram of the process provided in the embodiment of the present application;

[0103] Figure 6 A schematic diagram of a structure of a device provided in an embodiment of the present application;

[0104] Figure 7 Another schematic diagram of the structure of the device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0105] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail with reference to the accompanying drawings. The specific operation methods, functional descriptions, etc. in the method embodiments can also be applied to the device embodiments or system embodiments.

[0106] Figure 1 A possible, non-limiting system schematic is shown. Figure 1 As shown, the communication system 10 includes a radio access network (RAN) 100 and a core network (CN) 200. Optionally, the Internet 300 is also included.

[0107] The RAN 100 includes at least one RAN node (eg, Figure 1 110a and 110b, etc., may be collectively referred to as 110) and at least one terminal (e.g., Figure 1 120a to 120j, etc., may be collectively referred to as 120). RAN100 may also include other RAN nodes, such as wireless relay equipment and / or wireless backhaul equipment, etc. ( Figure 1 not shown).

[0108] The terminal 120 can be connected to the RAN node 110 in a wireless manner. The RAN node 110 is connected to the core network 200 in a wireless or wired manner. The core network device in the core network 200 and the RAN node 110 in the RAN 100 can be different physical devices, or they can be the same physical device that integrates the core network device logical functions and the radio access network logical functions.

[0109] RAN100 may be a cellular system related to the 3rd generation partnership project (3GPP), for example, a 4th generation (4G) mobile communication system, a 5th generation (5G) mobile communication system, or a future-oriented evolution system, for example, a 6th generation (6G) mobile communication system. RAN100 may also be an open access network (open RAN, O-RAN or ORAN), a cloud radio access network (cloud radio access network, CRAN), or a wireless fidelity (wireless fidelity, WiFi) system. RAN 100 may also be a communication system that integrates two or more of the above systems.

[0110] RAN node 110, sometimes also referred to as access network equipment, RAN entity or access node, etc., constitutes a part of the communication system to help terminals achieve wireless access. In the subsequent description of this application, "access network equipment" is used for description unless otherwise specified. Multiple RAN nodes 110 in the communication system 10 can be nodes of the same type or nodes of different types. In some scenarios, the roles of RAN node 110 and terminal 120 are relative, for example, Figure 1 The network element 120i may be a helicopter or a drone, which may be configured as a mobile base station. For the terminals 120j that access the RAN 100 through the network element 120i, the network element 120i is a base station; but for the base station 110a, the network element 120i is a terminal. The RAN node 110 and the terminal 120 are sometimes referred to as communication devices, for example Figure 1 The network elements 110a and 110b may be understood as communication devices having base station functions, and the network elements 120a-120j may be understood as communication devices having terminal functions.

[0111] In one possible scenario, a RAN node may be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next generation NodeB (gNB), a next generation base station in a 6G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system. A RAN node may be a macro base station (e.g. Figure 1 110a in), micro base stations or indoor stations (such as Figure 1110b in the figure), a relay node or a donor node, or a wireless controller in a CRAN scenario. Optionally, the RAN node may also be a server, a wearable device, a vehicle or an on-board device, etc. For example, the access network device in the vehicle to everything (V2X) technology may be a road side unit (RSU). All or part of the functions of the RAN node in the embodiment of the present application may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (such as a cloud platform). The RAN node in the embodiment of the present application may also be a logical node, a logical module or software that can implement all or part of the functions of the RAN node.

[0112] In another possible scenario, multiple RAN nodes collaborate to assist the terminal in achieving wireless access, and different RAN nodes respectively implement part of the functions of the base station. For example, the RAN node can be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU can be set separately, or can also be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or a radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU) or a remote radio head (RRH).

[0113] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, CU, CU-CP, CU-UP, DU and RU are described as examples in this application. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0114] The terminal may also be referred to as a terminal device, user equipment (UE), tag, mobile station, mobile terminal, etc. The terminal can be widely used in various scenarios, for example, device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality (VR), augmented reality (AR), industrial control, automatic driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal may be a mobile phone, a head-mounted display device, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, a drone, a helicopter, an airplane, a ship, a robot, a mechanical arm, a smart home device, etc. The embodiments of the present application do not limit the device form of the terminal.

[0115] In one design, a fixed maximum transmission bandwidth and a minimum guard-band (GB) are defined within the channel bandwidth of the terminal. The channel bandwidth of the terminal may be referred to as the first channel bandwidth. For example, the first channel bandwidth of the terminal is 200kHz. Within the first channel bandwidth of 200kHz, a fixed maximum transmission bandwidth of 180kHz and a fixed minimum guard bandwidth of 10kHz are defined. For example, on both sides of the maximum transmission bandwidth of 180kHz, a minimum guard bandwidth of 10kHz is left on each side. There are many types of terminals, and different types of terminals have different maximum tolerance requirements for frequency errors. Within a certain channel bandwidth, setting the configuration of the maximum transmission bandwidth and the minimum guard bandwidth of all types of terminals to fixed values ​​has various disadvantages. For example, for a terminal with a looser maximum frequency error requirement (i.e., the maximum value of the frequency error is large), it is necessary to configure a larger minimum protection bandwidth and a smaller maximum transmission bandwidth. Accordingly, the terminal has a poor ability to calibrate the frequency error. If the maximum transmission bandwidth and the minimum protection bandwidth of all types of terminals are set to fixed values, then for terminals with poor frequency deviation calibration capabilities, some of the transmitted signals may not meet the requirements, causing interference to the transmission of other information in adjacent frequency domain resources, affecting the system transmission performance. For terminals with stricter tolerance requirements for the maximum frequency error (i.e., the maximum value of the frequency error is small), it is necessary to configure a smaller minimum protection bandwidth and a larger maximum transmission bandwidth. Accordingly, the terminal has a stronger ability to calibrate the frequency error. If the maximum transmission bandwidth and the minimum protection bandwidth of all types of terminals are set to fixed values, it may cause a waste of frequency domain resources.

[0116] In the embodiments of the present application: according to the type of the terminal, the maximum transmission bandwidth of the terminal is determined, so that the maximum transmission bandwidth of the terminal matches the type of the terminal, and further the minimum protection bandwidth of the terminal matches the type of the terminal, thereby solving the various disadvantages caused by setting the maximum transmission bandwidth and the minimum protection bandwidth of the terminal as fixed values.

[0117] To facilitate understanding, the types of terminals involved in the embodiments of the present application are described, and the description is considered as part of the embodiments of the present application.

[0118] 1. A terminal that has the ability to reflect downlink carrier signals but does not have the ability to generate uplink carrier signals.

[0119] This type of terminal can be called a backscatter terminal. A backscatter terminal refers to a terminal that transmits uplink signals based on backscattering. This type of terminal does not have the ability to actively generate or produce uplink carrier signals, or does not have the ability to actively perform uplink transmission. It is necessary to use the downlink carrier signal (i.e., the downlink carrier signal) for reflection to achieve uplink signal transmission. For example, a backscatter terminal can receive a downlink carrier signal. For example, the downlink carrier signal can be a single-frequency carrier signal, an orthogonal frequency division multiplexing (OFDM) signal that occupies a single subcarrier in the frequency domain, or an OFDM signal that occupies multiple subcarriers in the frequency domain. The backscatter terminal can modulate the uplink information to be transmitted on the received downlink carrier signal and reflect it in the uplink.

[0120] Backscatter terminals may include passive terminals and semi-passive terminals. Passive terminals refer to terminals that are completely powered by external energy. For example, passive terminals can receive energy signals sent by access network equipment, and convert energy signals into DC voltages through rectifiers, etc., for energy supply. This energy can support the demodulation of downlink signals by passive terminals, as well as the reflected transmission of uplink modulated signals. Semi-passive terminals refer to terminals that are powered by both external and internal energy supplies.

[0121] Optionally, for the backscatter terminal, the device that provides the downlink carrier signal may be an access network device, a reader device, a helper device, or other devices that can excite the reverse radio frequency terminal, etc. It is understandable that the device that provides the downlink carrier signal and the device that provides the energy signal may be the same device or different devices, etc., without limitation.

[0122] The backscatter terminal does not have the ability to generate an uplink carrier signal, nor does it have the ability to generate a local high-frequency local oscillator. It only has a low-frequency clock. Due to the limitation of low power consumption, the clock sampling deviation of the low-frequency clock of the backscatter terminal is large, resulting in a large frequency error in sending uplink signals and receiving downlink signals.

[0123] In one design, a passive terminal and a semi-passive terminal may be terminals in ambient IoT (A-IoT), and a passive terminal, a semi-passive terminal, etc. may be respectively referred to as a passive A-IoT terminal and a semi-passive A-IoT terminal.

[0124] 2. A terminal capable of generating an uplink carrier signal.

[0125] Terminals capable of generating uplink carrier signals include two categories, namely, legacy terminals and active terminals in A-IoT, which may be referred to as active A-IoT terminals. The maximum value of the frequency error of the legacy terminal may be equal to X, and the maximum value of the frequency error of the active A-IoT terminal may be greater than X. In one implementation, X is a non-negative number, for example, X is equal to 0.1 parts per million (ppm). For example, the legacy terminal may be a terminal in 5G, which may be referred to as a new radio (NR) terminal, or a terminal in 4G, which may be referred to as a long term evolution (LTE) terminal, or a terminal in a narrowband IoT, which may be referred to as a narrowband IoT (NB-IoT) terminal.

[0126] Active A-IoT terminals have the ability to actively generate uplink carrier signals and can actively perform uplink transmission. Unlike traditional terminals, active A-IoT terminals still need to obtain energy from the outside world or need to obtain part of the required energy from the outside world for signal transmission. For active A-IoT terminals, no other equipment is required to provide downlink carrier signals. Active A-IoT terminals modulate uplink signals on the uplink carriers they generate to enable uplink transmission. However, due to the low power consumption of active A-IoT terminals, the oscillator of the generated local oscillation frequency is generally a ring oscillator, and the residual frequency error is larger than the frequency error of traditional terminals, and the maximum value of the frequency error is greater than X. For active A-IoT terminals, the typical maximum value of the frequency error can be 1ppm, 5ppm, 10ppm, 20ppm, or 50ppm, etc.

[0127] Embodiment 1

[0128] In the first embodiment: the terminal or access network device can determine the maximum transmission bandwidth of the terminal according to the type of the terminal. Figure 2 As shown, a process is provided, including:

[0129] Step 210: The terminal determines a maximum transmission bandwidth of the terminal under a first channel bandwidth and a first subcarrier spacing.

[0130] In one implementation, the first channel bandwidth and the first subcarrier spacing may be the channel bandwidth and subcarrier spacing under the current transmission of the terminal, or may be described as: the terminal performs signal transmission with the access network device under the first channel bandwidth and the first subcarrier spacing, and the signal transmission includes uplink signal transmission and downlink signal transmission.

[0131] In one design, the first channel bandwidth and the first subcarrier spacing may be specified in the protocol, predefined, or configured by the access network device to the terminal, etc., without limitation. For example, the frequency bands specified in the protocol include: n8 band, n10 band, n28 band or other NR bands, etc. Taking the n8 band as an example, the band is a frequency division duplexing (FDD) band, and the uplink frequency range of the band is 880MHz-915MHz, and the downlink frequency range is 925MHz-960MHz. Corresponding to the n8 band, if the subcarrier spacing configured in the band is 15kHz, the first channel bandwidth may be 5MHz, 10MHz, 15MHz or 20MHz. If the subcarrier spacing configured in the band is 30kHz, the first channel bandwidth may be 10MHz, 15MHz or 20MHz.

[0132] In one design, the first channel bandwidth includes a maximum transmission bandwidth and a minimum protection bandwidth. Among them, all frequency domain resources in the maximum transmission bandwidth can be used to transmit signals, and all frequency domain resources in the minimum protection bandwidth cannot be used to transmit signals. Using the example of the n8 band, if the first channel bandwidth is 5MHz and the configured subcarrier spacing is 15kHz, the maximum transmission bandwidth specified in the protocol is 25 resource blocks (RBs), and each RB occupies 12 subcarriers. Then, at a subcarrier spacing of 15kHz, each RB corresponds to 180kHz (12*15kHz=180kHz), and 25 RBs occupy 4.5MHz (25*180kHz=4500kHz=4.5MHz). The minimum protection bandwidth specified in the protocol satisfies the following: minimum protection bandwidth=(channel bandwidth-maximum transmission bandwidth) / 2-subcarrier spacing / 2. In the above example, the channel bandwidth is 5MHz, the maximum transmission bandwidth is 4.5MHz, and the subcarrier spacing is 15kHz, then the minimum protection bandwidth can be (5MHz-4.5MHz) / 2-15kHz / 2=242.5kHz. The minimum protection band is located on both sides of the maximum transmission bandwidth, each occupying 242.5kHz.

[0133] In one design, under the first channel bandwidth and the first subcarrier spacing, the maximum transmission bandwidth of the terminal is associated with the type of the terminal. Alternatively, step 210 may be described as: under the first channel bandwidth and the first subcarrier spacing, the terminal determines the maximum transmission bandwidth of the terminal according to its own terminal type. Optionally, the type of the terminal may also be referred to as the capability of the terminal. For different types of terminals, their corresponding capabilities for calibrating frequency offset are different.

[0134] For example, the types of terminals include: a terminal capable of generating an uplink carrier signal, and a terminal capable of reflecting a downlink carrier signal but not generating an uplink carrier signal.

[0135] 1. A terminal that has the ability to reflect downlink carrier signals but does not have the ability to generate uplink carrier signals is also called a backscatter terminal. Backscatter terminals include passive terminals and semi-passive terminals. Backscatter terminals do not have the ability to automatically generate uplink carrier signals and need to rely on downlink carrier signals sent by other devices for uplink transmission.

[0136] 2. The terminal capable of generating an uplink carrier signal may include: a terminal whose maximum frequency error is equal to X and a terminal whose maximum frequency error is greater than X.

[0137] The terminal whose maximum frequency error is equal to X may be a traditional terminal, such as an NR terminal, an LTE terminal, or an NB-IoT terminal. The terminal whose maximum frequency error is greater than X may be an active terminal in A-IoT, which may be referred to as an active A-IoT terminal.

[0138] In one design, for the first channel bandwidth, there is a corresponding relationship between the type of terminal and the maximum transmission bandwidth. The corresponding relationship between the type of terminal and the maximum transmission bandwidth may be specified by the protocol, predefined, or configured by the access network device to the terminal, etc., without limitation. Under the current first channel bandwidth, the terminal may determine the maximum transmission bandwidth of the terminal according to its own type in the corresponding relationship between the type of terminal and the maximum transmission bandwidth. Afterwards, the terminal determines the minimum protection bandwidth according to the first channel bandwidth and the maximum transmission bandwidth. For example, the minimum protection bandwidth satisfies the following: minimum protection bandwidth = (first channel bandwidth - maximum transmission bandwidth) / 2 - subcarrier spacing / 2.

[0139] For backscatter terminals, there is a frequency offset. Setting the minimum protection bandwidth is mainly used to deal with: the frequency offset of the backscatter terminal. For example, the first channel bandwidth of the passive terminal is 1 RB. When the subcarrier spacing is 15kHz, 1 RB occupies 180kHz (15kHz*12=180kHz). If the maximum value of the frequency error of the passive terminal is equal to 7%, then within the first channel bandwidth, the frequency offset of the passive terminal is equal to 180kHz*7%=12.6kHz. Then the minimum protection bandwidth configured for the passive terminal needs to be greater than or equal to 12.6kHz.

[0140] For traditional terminals and active A-IoT terminals, there is a carrier frequency error. The minimum protection bandwidth is mainly used to deal with the frequency error between traditional terminals and active A-IoT terminals, which can be measured in ppm. For example, the maximum value of the frequency error of the active A-IoT terminal is equal to 10ppm. At a carrier frequency of 900MHz, the maximum value of the actual frequency deviation corresponding to 10ppm is equal to 9kHz (900MHz*10ppm). The minimum protection bandwidth configured for the active A-IoT terminal needs to be greater than or equal to 9kHz.

[0141] In one design, the ability to calibrate frequency deviation for traditional terminals and active A-IoT terminals is stronger than that for backscatter terminals. Therefore, the minimum protection bandwidth corresponding to traditional terminals and active A-IoT terminals can be smaller than that of backscatter terminals. Since the first channel bandwidth of the terminal is constant, the relationship between the minimum protection bandwidth and the maximum transmission bandwidth is as follows: the smaller the minimum protection bandwidth, the larger the maximum transmission bandwidth. Conversely, the larger the minimum protection bandwidth, the smaller the maximum transmission bandwidth.

[0142] That is to say, the maximum transmission bandwidth corresponding to the traditional terminal and the active A-IoT terminal may be greater than that of the backscatter terminal. Or it can be described as follows: the maximum transmission bandwidth corresponding to the terminal capable of generating an uplink carrier signal is greater than the maximum transmission bandwidth corresponding to the terminal capable of backscattering a downlink carrier signal but not capable of generating an uplink carrier signal.

[0143] In one design, for traditional terminals and active A-IoT terminals, the ability of traditional terminals to calibrate frequency deviation is stronger than that of active A-IoT terminals. For example, the maximum value of the frequency error for traditional terminals is equal to X, and the maximum value of the frequency error for active A-IoT terminals is equal to or greater than X. The minimum protection bandwidth corresponding to the traditional terminal is smaller than the minimum protection bandwidth corresponding to the active A-IoT terminal. Furthermore, the maximum transmission bandwidth corresponding to the traditional terminal is larger than the maximum transmission bandwidth corresponding to the active A-IoT terminal. Alternatively, it can also be described as follows: the maximum transmission bandwidth corresponding to the terminal whose maximum value of the frequency error is equal to X is larger than the maximum transmission bandwidth corresponding to the terminal whose maximum value of the frequency error is equal to or greater than X.

[0144] For example, the first channel bandwidth of the active A-IoT terminal and the traditional terminal is 180kHz, the first subcarrier spacing is 15kHz, and both work in the 1.8GHz frequency band. The maximum value of the frequency error of the active A-IoT terminal is 10ppm. In the 1.8GHz frequency band, the actual frequency corresponding to 10ppm is equal to 18kHz (1.8GHz*10ppm), that is, the maximum value of the frequency deviation of the active A-IoT terminal is equal to 18kHz. In one design, within the 180kHz channel bandwidth of the active terminal, the maximum transmission bandwidth can be configured to 135kHz, and the minimum protection bandwidth configured on the left and right sides of the maximum transmission bandwidth can be 22.5kHz. For the traditional terminal, the maximum value of the frequency error is 1ppm. In the 1.8GHz frequency band, the actual frequency corresponding to 1ppm is equal to 0.18kHz. In one design, within the 180kH channel bandwidth of the traditional terminal, the maximum transmission bandwidth can be configured to 170kHz, and the minimum protection bandwidth configured on the left and right sides of the maximum transmission bandwidth can be 5kHz. It can be seen that under the same conditions, the maximum transmission bandwidth corresponding to the traditional terminal is 170kHz, which is larger than the maximum transmission bandwidth corresponding to the active A-IoT terminal of 135kHz.

[0145] Step 220: The terminal transmits signals with the access network device according to the maximum transmission bandwidth of the terminal.

[0146] In one design, after the terminal determines the maximum transmission bandwidth of the terminal, it can perform signal transmission with the access network device within the maximum transmission bandwidth, and the signal transmission can be an uplink signal transmission or a downlink signal bandwidth. For example, the maximum transmission bandwidth of the terminal includes 10 RBs, and the indexes of the 10 RBs are 0 to 9. When the subcarrier spacing is 15kHz, each RB occupies 180kHz. The access network device can configure the signal bandwidth for the terminal within the maximum transmission bandwidth of the terminal, and the signal bandwidth can be an uplink signal bandwidth or a downlink signal bandwidth. For example, the access network device can instruct or configure the terminal to perform signal transmission on the RBs with indexes 0 and 1, and the terminal can determine the RBs corresponding to indexes 0 and 1 within the maximum transmission bandwidth of the terminal, and send uplink signals or receive downlink signals on the RBs corresponding to indexes 0 and 1. The RBs corresponding to indexes 0 and 1 can be considered as the uplink signal bandwidth or downlink signal bandwidth of the terminal.

[0147] In one design, the uplink maximum transmission bandwidth of the terminal may be the same as the downlink maximum transmission bandwidth, and the maximum transmission bandwidth of the terminal in the above text may refer to the uplink maximum transmission bandwidth of the terminal, or the downlink maximum transmission bandwidth. Alternatively, the uplink maximum transmission bandwidth of the terminal may be different from the downlink maximum transmission bandwidth, and the maximum transmission bandwidth of the terminal in the above text includes the uplink maximum transmission bandwidth and the downlink maximum transmission bandwidth of the terminal. Further, the uplink maximum transmission bandwidth of the terminal may be greater than the downlink maximum transmission bandwidth of the terminal. For example, when the first channel bandwidth is 360kHz, the uplink maximum transmission bandwidth of the terminal may be 320kHz, and the downlink maximum transmission bandwidth of the terminal may be 180kHz. Such a design is mainly based on the following considerations: when the terminal accesses the network, it first receives the downlink signal. The downlink signal may be a synchronization signal or other broadcast signal, etc. The terminal may perform frequency correction based on the downlink signal. At this time, the frequency error of the terminal will become smaller, so a larger maximum transmission bandwidth can be supported during uplink transmission. For example, if no frequency correction is performed, the frequency error of the active A-IoT terminal is 100ppm, and the corresponding actual frequency error value is 9kHz in the 900MHz frequency band. If the first channel bandwidth of the active A-IoT terminal is 360kHz, the maximum downlink transmission bandwidth of the active A-IoT terminal can be configured to 180kHz, and the minimum protection bandwidth can be configured to 90kHz ((360kHz-180kHz) / 2). When the active A-IoT terminal receives the downlink signal, it performs frequency correction according to the downlink signal. After correction, the residual frequency error of the active A-IoT terminal is 10ppm, and the corresponding actual frequency error is 0.9kHz in the 900MHz frequency band. At this time, the maximum uplink transmission bandwidth of the active A-IoT terminal can be configured to 320kHz, and the minimum protection bandwidth can be configured to 20kHz ((360-320) / 2). It can be seen that for the active A-IoT terminal, the maximum uplink transmission bandwidth of 320kHz is greater than the maximum downlink transmission bandwidth of 180kHz.

[0148] Optional, in Figure 2 The process may also include:

[0149] Step 230: The access network device determines the maximum transmission bandwidth of the terminal under the first channel bandwidth and the first subcarrier spacing.

[0150] Among them, the process of the access network device determining the maximum transmission bandwidth of the terminal is similar to the process of the terminal determining the maximum transmission bandwidth of the terminal. For example, the access network device may determine the maximum transmission bandwidth of the terminal according to the type of the terminal under the first channel bandwidth and the first subcarrier spacing. There is no restriction on the way in which the access network device obtains the terminal type. For example, the terminal may actively report its type to the access network device. For example, in one implementation, when the terminal accesses the access network device, it may actively report its type to the access network device, etc. For other contents about the access network device determining the maximum transmission bandwidth of the terminal, please refer to the description on the terminal side and will not be repeated here.

[0151] It is understandable that in step 220, it is described that after the terminal determines the maximum transmission bandwidth of the terminal, the terminal can transmit with the access network device according to the maximum transmission bandwidth of the terminal. Optionally, in step 230, after the access network device determines the maximum transmission bandwidth of the terminal, the access network device can perform signal transmission with the terminal according to the maximum transmission bandwidth of the terminal. Signal transmission may include uplink signal transmission and / or downlink signal transmission. Different from the terminal side, the access network device can schedule uplink signal transmission or downlink signal transmission for the terminal according to the maximum transmission bandwidth of the terminal.

[0152] For example, if the maximum transmission bandwidth of the terminal includes 10 RBs, the access network device determines one or more RBs as the downlink signal bandwidth or the uplink signal bandwidth among the 10 RBs corresponding to the maximum transmission bandwidth of the terminal, and configures or indicates the RBs corresponding to the downlink signal bandwidth or the uplink signal bandwidth to the terminal. For downlink transmission, the access network device sends a downlink signal to the terminal on the downlink signal bandwidth. Correspondingly, the terminal receives the downlink signal sent by the access network device on the downlink signal bandwidth. For uplink transmission, the terminal sends an uplink signal to the access network device on the uplink signal bandwidth. Correspondingly, the access network device receives the uplink signal sent by the terminal on the uplink signal bandwidth.

[0153] exist Figure 2In the scheme, the following is mainly described: the terminal and the access network device each determine the maximum transmission bandwidth of the terminal according to the type of the terminal. Then, the process of communicating with the other end is carried out according to the maximum transmission bandwidth of the terminal. Alternatively, in one design, the access network device can determine the maximum transmission bandwidth of the terminal according to the type of the terminal. The access network device can configure or indicate the maximum transmission bandwidth of the terminal to the terminal. The terminal can obtain the maximum transmission bandwidth of the terminal according to the configuration or instruction of the access network device. In this design, since the terminal does not need to determine the maximum transmission bandwidth of the terminal according to the type of the terminal, the energy consumption of the terminal can be saved. Alternatively, in another design, the terminal can determine the maximum transmission bandwidth of the terminal according to its own type, and report the maximum transmission bandwidth of the terminal to the access network device. The access network device can obtain the maximum transmission bandwidth of the terminal according to the report of the terminal, without having to determine the maximum transmission bandwidth of the terminal by itself.

[0154] In one implementation, in a current wireless communication system, such as a 5G communication system, as the first channel bandwidth of the terminal increases, the proportion of the minimum protection bandwidth to the first channel bandwidth will decrease, and the proportion of the maximum transmission bandwidth to the first channel bandwidth will increase. For example, in the frequency band below 6GHz, the minimum value of the first channel bandwidth of the terminal is 5MHz and the maximum value is 100MHz. In the range of 5MHz to 100MHz, if the subcarrier spacing is 15kHz, as the first channel bandwidth gradually increases, the proportion of the minimum protection bandwidth to the first channel bandwidth gradually decreases, and the proportion of the maximum transmission bandwidth to the first channel bandwidth gradually increases. For example, when the first channel bandwidth is 5MHz, the maximum transmission bandwidth is 25RB, that is, 4.32MHz, and the maximum transmission bandwidth accounts for 90%. When the first channel bandwidth is 10MHz, the maximum transmission bandwidth is 52RB, that is, 9.36MHz, and the maximum transmission bandwidth accounts for 93.6%. When the first channel bandwidth is 15MHz, the maximum transmission bandwidth is 79RB, that is, 14.22MHz, and the maximum transmission bandwidth accounts for 94.8%. In an embodiment of the present application, the frequency error of the backscatter terminal may jitter as the channel bandwidth increases, and the proportional relationship between the maximum transmission bandwidth and the first channel bandwidth does not satisfy the definition that as the first channel bandwidth increases, the proportion of the minimum protection bandwidth gradually decreases, and the proportion of the maximum transmission bandwidth gradually increases.

[0155] In one design, the maximum transmission bandwidth and the minimum protection bandwidth of the terminal are associated with the frequency band in which the terminal is located. The higher the corresponding frequency value of the frequency band, the smaller the maximum transmission bandwidth of the terminal and the larger the minimum protection bandwidth. Optionally, the minimum protection bandwidth is proportional to the carrier frequency, the carrier center frequency, the frequency band start frequency, or the frequency band cutoff frequency. For example, when the carrier frequency is 900MHz and the frequency error is 0.1ppm, the frequency deviation is 9kHz; when the carrier frequency is 1.8GHz and the frequency error is 0.1ppm, the frequency deviation is 18kHz.

[0156] In the first embodiment, different types of terminals have different capabilities for calibrating frequency deviation. In the embodiment of the present application, the maximum transmission bandwidth that matches the capability of calibrating frequency deviation can be determined according to the type of terminal. For example, for a terminal with poor capability for calibrating frequency deviation, a larger minimum protection bandwidth and a smaller maximum transmission bandwidth can be configured. For a terminal with better capability for calibrating frequency deviation, a smaller minimum protection bandwidth and a larger maximum transmission bandwidth can be configured, so that the maximum transmission bandwidth configured for the terminal matches its capability for calibrating frequency deviation.

[0157] Embodiment 2

[0158] The solution of the second embodiment: is mainly used to compare the maximum signal bandwidths of two uplink signals. For example, the uplink signal sent first by the terminal is called the first uplink signal, and the uplink signal sent later is called the second uplink signal. The maximum signal bandwidth of the second uplink signal may be greater than the maximum signal bandwidth of the first uplink signal. The main considerations are as follows: the terminal can perform frequency correction based on the first uplink signal sent first. Therefore, after correction, the frequency error of the terminal will become smaller, and therefore, the maximum signal bandwidth supported by the second uplink signal may be smaller than the maximum signal bandwidth supported by the first uplink signal. Compared with the second uplink signal and the first uplink signal configured with the same maximum signal bandwidth, the transmission efficiency and frequency domain resource utilization of the uplink transmission of different uplink transmission stages, different uplink channels, and different uplink signals can be improved. Figure 3 As shown, a process is provided, which at least includes:

[0159] Step 310: The terminal sends a first uplink signal to the access network device on the first uplink channel. The access network device receives the first uplink signal from the terminal on the first uplink channel.

[0160] Step 320: The terminal sends a second uplink signal to the access network device on the second uplink channel. The access network device receives the second uplink signal from the terminal on the second uplink channel.

[0161] In one design, the maximum signal bandwidth of the second uplink signal is greater than the maximum signal bandwidth of the first uplink signal. Optionally, the maximum value of the frequency error of the first uplink signal may be a first value, and the maximum value of the frequency error of the second uplink signal may be a second value, and the second value may be less than the first value. That is, since the maximum value of the frequency error of the second uplink signal is less than the maximum value of the frequency error of the first uplink signal, the second uplink signal can support a larger maximum signal bandwidth relative to the first uplink signal.

[0162] In one implementation, the first uplink signal corresponds to a first bandwidth set, and the second uplink signal corresponds to a second bandwidth set. The first bandwidth set and the second bandwidth set may be specified by a protocol, preset, or configured by an access network device to a terminal, etc., without limitation. Optionally, the first uplink signal corresponding to the first bandwidth set may also be referred to as the first uplink channel corresponding to the first bandwidth set, and the second uplink signal corresponding to the second bandwidth set may also be referred to as the second uplink channel corresponding to the second bandwidth set. The first bandwidth set and the second bandwidth set each include at least one signal bandwidth. During actual transmission, the access network device may configure a signal bandwidth in the first bandwidth set to the terminal, and the terminal sends the first uplink signal on the first uplink channel according to the configured signal bandwidth. The access network device may configure a signal bandwidth in the second bandwidth set to the terminal, and the terminal sends the second uplink signal on the second uplink channel according to the configured signal bandwidth. In the embodiment of the present application, the size relationship between the signal bandwidth of the first uplink signal transmitted in the first uplink channel and the signal bandwidth of the second uplink signal transmitted in the second uplink channel is not limited, and only the size relationship between the maximum signal bandwidth in the second bandwidth set and the maximum signal bandwidth in the first bandwidth set is defined. For example, the maximum signal bandwidth in the second bandwidth set is greater than the maximum signal bandwidth in the first bandwidth set. It can be understood that the maximum signal bandwidth in the second bandwidth set is the maximum signal bandwidth of the aforementioned second uplink signal, and the maximum signal bandwidth in the first bandwidth set is the maximum signal bandwidth of the aforementioned first uplink signal. For example, the maximum transmission bandwidth of the terminal can be 180kHz, then the first bandwidth set corresponding to the first uplink signal includes 15kHz, 30kHz, 60kHz and 120kHz. The second bandwidth set corresponding to the second uplink signal includes 15kHz, 30kHz, 60kHz, 120kHz and 150kHz. It can be seen that the maximum signal bandwidth in the second bandwidth set, that is, the maximum signal bandwidth of the second uplink signal of 150kHz, is greater than the maximum signal bandwidth in the first bandwidth set, that is, the maximum signal bandwidth of the first uplink signal of 120kHz. In actual transmission, the access network device can configure or indicate any one of the four signal bandwidths included in the first bandwidth set to the terminal, and the terminal transmits the first uplink signal on the first uplink channel using the configured or indicated signal bandwidth. Similarly, the access network device can configure or indicate any one of the five signal bandwidths included in the second bandwidth set to the terminal, and the terminal transmits the second uplink signal on the second uplink channel using the configured or indicated signal bandwidth.

[0163] It is understandable that the maximum transmission bandwidth of the first uplink signal and the maximum transmission bandwidth of the second uplink signal should be less than or equal to the maximum transmission bandwidth of the terminal. For example, the first channel bandwidth of the terminal is 180kHz, and the maximum transmission bandwidth of the terminal is 160kHz. The first bandwidth set of the first uplink signal or the second bandwidth set of the second uplink signal configured by the access network device for the terminal may include: 15kHz, 30kHz, 60kHz, 120kHz and 150kHz. It can be seen that the maximum signal bandwidth in the bandwidth set is 150kHz, which is less than the maximum transmission bandwidth of the terminal, 160kHz.

[0164] Optionally, between step 310 and step 320, the following may be further included: step 330: the access network device sends a first downlink signal to the terminal on the first downlink channel. The terminal receives the first downlink signal from the access network device on the first downlink channel.

[0165] In one design, the first downlink signal includes frequency adjustment information. For example, the frequency adjustment information of the first uplink signal includes one or more of the following: the frequency error of the first uplink signal, the maximum value of the frequency error of the first uplink signal, the frequency adjustment command of the second uplink signal, or the frequency adjustment value of the second uplink signal. Take the access network device determining the frequency error of the first uplink signal as an example: when receiving the first uplink signal, the access network device can determine the frequency of the first uplink signal by detection. The access network device compares the detected frequency of the first uplink signal with the frequency of the indicated or configured first uplink signal, obtains the frequency difference between the two, and then determines the frequency error of the first uplink signal. Among them, the frequency of the first uplink signal may refer to the frequency range of the first uplink signal, the center frequency of the first uplink signal, or the start or end frequency of the first uplink signal. That is, in the embodiment of the present application, the access network device determines the frequency error of the first uplink signal by comparing the two frequency ranges of the first uplink signal. Alternatively, the access network device can determine the frequency error of the first uplink signal by comparing the two center frequencies of the first uplink signal. Alternatively, the access network device may determine the frequency error of the first uplink signal by comparing the starting frequency or the ending frequency of the first uplink signal. Take the case where the access network device compares the two frequency ranges of the first uplink signal to determine the frequency error of the first uplink signal as an example: for example, the signal bandwidth of the first uplink signal indicated or configured by the access network device is 15kHz, and the frequency range of the first uplink signal is 920MHz to 920.015MHz. When the access network device receives the first uplink signal, it detects that the frequency range of the first uplink signal is 920.015MHz to 920.030MHz, and the frequency error of the first uplink signal may be determined to be +15kHz. It is understandable that if the value of the determined frequency error of the first uplink signal is a positive value, it indicates that the frequency of the received first uplink signal deviates in the direction of increasing frequency relative to the frequency of the indicated or configured first uplink signal. On the contrary, if the value of the determined frequency error of the first uplink signal is a negative value, it indicates that the frequency of the received first uplink signal deviates in the direction of decreasing frequency relative to the frequency of the indicated or configured first uplink signal.

[0166] In one design, the terminal may obtain frequency adjustment information in the first downlink signal. The terminal performs frequency adjustment according to the frequency adjustment information. After the frequency adjustment, the terminal sends a second uplink signal to the access network device on the second uplink channel. For example, the terminal may adjust its own frequency oscillator according to the frequency error of the first uplink signal. After the adjustment, the frequency error of the terminal will be reduced compared to before the adjustment. Therefore, the second downlink signal can support a larger maximum signal bandwidth relative to the first downlink signal. For example, in the channel of the terminal, the maximum signal bandwidth that can be configured for the first uplink signal is 150kHz. In the frequency band of the carrier center frequency of 900MHz, the frequency error of the first uplink signal is about 20ppm, and the frequency error of the first uplink signal is 18kHz. The terminal may obtain the frequency error of the first uplink signal of 20ppm in the first downlink signal. The terminal performs frequency adjustment, and the frequency error of the terminal after the adjustment is about 5ppm, and the frequency error of the second uplink signal is 4.5kHz. The maximum signal bandwidth that can be configured for the second uplink signal can be 170kHz, which is greater than the maximum signal bandwidth of 150kHz that can be configured for the first uplink signal.

[0167] [Example 1]

[0168] In the random access scenario, it can be applied Figure 3 Methods in the process. Taking 4-step random access as an example, the 4-step random access process of the terminal includes:

[0169] Step 1: The terminal sends a message 1 on a physical random access channel (PRACH), where the message 1 is a random access preamble. Optionally, the random access preamble may also be referred to as a random access preamble sequence.

[0170] In one design, Figure 3 The first uplink signal in the process may be a signal carrying message 1.

[0171] Step 2: The access network device sends a message 2 on a physical downlink shared channel (PDSCH), where the message 2 may be called a random access response (RAR).

[0172] In one design, Figure 3 The first downlink signal in the process may be a signal carrying message 2. Message 2 may carry frequency adjustment information. The terminal may perform frequency adjustment according to the frequency adjustment information.

[0173] Step 3: The terminal sends message 3 to the access network device on the physical uplink shared channel (PUSCH).

[0174] In one design, if message 2 carries frequency adjustment information, the uplink signal carrying message 3 may be referred to as a second uplink signal. The maximum signal bandwidth of the uplink signal carrying message 3 is greater than the maximum signal bandwidth of the uplink signal carrying message 1.

[0175] Step 4: The access network device sends message 4 to the terminal on the PDSCH. Message 4 may be called a contention resolution message.

[0176] In one design, Figure 3 The first downlink signal in the process may be a signal carrying message 4. Message 4 may carry frequency adjustment information. The terminal may perform frequency adjustment according to the frequency adjustment information.

[0177] Through the above steps 1 to 4, when the terminal successfully accesses randomly, the access network device can schedule the terminal to send the first uplink signal to the access network device on PUSCH, and the first uplink signal can carry message 5. In other words, the message carried in the first uplink signal sent after the terminal successfully accesses randomly can be called message 5, or the first uplink message sent after the terminal successfully accesses randomly can be called message 5, etc. If message 4 carries frequency adjustment information, the uplink signal carrying message 5 can be called Figure 3 The second uplink signal in the process, the maximum signal bandwidth corresponding to the second uplink signal may be greater than the maximum signal bandwidth of the first uplink signal. At this time, the first uplink signal may be an uplink signal carrying message 1, or an uplink signal carrying message 3. That is to say, the maximum signal bandwidth of the uplink signal carrying message 5 is greater than the maximum signal bandwidth of the uplink signal carrying message 1 or message 3.

[0178] Summarizing the above four-step random access process, we can get the following: In one design, the uplink signal carrying message 1 can be called the first uplink signal. Optionally, the downlink signal carrying message 2 can be called the first downlink signal, and the first downlink signal carries frequency adjustment information. The terminal can perform frequency adjustment according to the frequency adjustment information. Afterwards, the uplink signal carrying message 3 can be called the second uplink signal. Alternatively, the uplink signal after carrying message 3 (for example, message 5) can be called the second uplink signal. At this time, the maximum signal bandwidth of the second uplink signal carrying message 3 or message 5 is greater than the maximum signal bandwidth of the first uplink signal carrying message 1. The first uplink channel is PRACH, and the second uplink channel is PUSCH or PUCCH. Alternatively,

[0179] In one design, the uplink signal carrying message 3 may be referred to as the first uplink signal. The downlink signal carrying message 4 may be referred to as the first downlink signal, and the first downlink signal includes frequency adjustment information. The terminal may perform frequency adjustment according to the frequency adjustment information. The uplink signal after message 3 may be referred to as the second uplink signal. For example, the second uplink signal may be an uplink signal carrying an acknowledgement (ACK) or a negative acknowledgement (NACK) of message 4 or an uplink signal carrying message 5. At this time, the maximum signal bandwidth of the second uplink signal carrying the ACK or NACK of message 4 or message 5 is greater than the maximum signal bandwidth of the first uplink signal carrying message 3. The first uplink channel is PUSCH. And when the second uplink signal is an uplink signal carrying message 4, the second uplink channel is PUCCH. Alternatively, when the second uplink signal is an uplink signal carrying message 5, the second uplink channel is PUSCH.

[0180] Of course, in one implementation, a first bandwidth set may be configured for the first uplink signal, and a second bandwidth set may be configured for the second uplink signal. The access network device may configure or instruct the terminal to send the first uplink signal within a signal bandwidth included in the first bandwidth set. The access network device may configure or instruct the terminal to send the second uplink signal within a signal bandwidth included in the second bandwidth set. The maximum signal bandwidth included in the second bandwidth set is greater than the maximum signal bandwidth included in the first bandwidth set.

[0181] Example 2

[0182] In the random access scenario, it can be applied Figure 3 Methods in the process. Taking 2-step random access as an example, the 2-step random access of the terminal includes:

[0183] Step 1: The terminal sends message A to the access network device. In one implementation, message A includes message 1 and message 3 in the 4-step random access process. In one implementation, the terminal sends a random access preamble to the access network device on the PRACH and sends data to the access network device on the PUSCH.

[0184] In one design, Figure 3 The first uplink signal in the process may be a signal carrying message A, and the first uplink channel may be PRACH or PUSCH.

[0185] Step 2: The access network device sends a message B to the terminal on the PDSCH. In one implementation, the message B includes message 2 and message 4 in the 4-step random access process.

[0186] In one design, Figure 3The first downlink signal in the process may be a signal carrying message B, and message B may include frequency adjustment information. The first downlink channel may be PDSCH. The terminal may perform frequency adjustment according to the frequency adjustment information. After the terminal successfully performs random access, the first uplink signal sent by the terminal to the access network device carries message 5. The uplink signal carrying message 5 may be called the second uplink signal, and the second uplink channel may be PUSCH. The maximum signal bandwidth of the second uplink signal is greater than the maximum signal bandwidth of the first uplink signal. That is, the maximum signal bandwidth of the uplink signal carrying message 5 is greater than the maximum signal bandwidth of the uplink signal carrying message A.

[0187] Of course, in the embodiment of the present application, the first bandwidth set may be configured for the first uplink signal carrying message A, and the second bandwidth set may be configured for the second uplink signal carrying message 5. The maximum signal bandwidth in the second bandwidth set is greater than the maximum signal bandwidth in the first bandwidth set. The access network device may be configured or instructed that the terminal sends the first uplink signal on a signal bandwidth in the first bandwidth set. The access network device may be configured or instructed that the terminal sends the second uplink signal on a signal bandwidth in the second bandwidth set.

[0188] Example 3

[0189] In asynchronous systems, you can apply Figure 3 In an asynchronous system, before a terminal sends a data signal to an access network device, the terminal needs to first send a synchronization signal or a reference signal to the access network device. The synchronization signal or the reference signal is used for time synchronization between the access network device and the terminal. In other words, the terminal can first send a synchronization signal or a reference signal to the access network device, and then the terminal sends a data signal to the access network device. In one design, the aforementioned Figure 3 The first uplink signal in the process may be a synchronization signal or a reference signal, and the second uplink signal may be a signal carrying uplink data information, or a signal carrying uplink control information. The synchronization signal or reference signal is the synchronization signal or reference signal of the second uplink signal, or it can be said that the synchronization signal or reference signal is associated with the second uplink signal, and the synchronization signal or reference signal is used for time synchronization between the access network device and the terminal. The maximum signal bandwidth of the data signal is greater than the maximum signal bandwidth of the synchronization signal or the reference signal. In one implementation, the synchronization signal or reference signal is transmitted in the PUSCH, and the second uplink signal can be transmitted in the PUSCH or PUCCh. In other words, Figure 3 The first uplink channel in the process may be PUSCH, and the second uplink channel may be PUCCH or PUSCH. Through the above design, by detecting and adjusting the frequency of a reference signal or synchronization signal with a shorter transmission duration, the transmission efficiency and frequency domain resource utilization can be further improved when an uplink data signal with a longer transmission duration is subsequently transmitted.

[0190] In one design, between the terminal sending a synchronization signal or a reference signal and the terminal sending a second uplink signal, it also includes: the terminal receives a first downlink signal from an access network device on a first downlink channel, and the first downlink signal includes frequency adjustment information. The first downlink signal may be a data signal or a control signal, and the first downlink channel may be a PDSCH or a physical downlink control channel (PDCCH), etc., without limitation. For example, in one implementation: the terminal sends a synchronization signal or a reference signal to the access network device on a PUSCH. The access network device performs time synchronization with the terminal according to the synchronization signal or the reference signal. The access network device determines the frequency adjustment information according to the synchronization signal or the reference signal. The access network device sends a first downlink signal to the terminal on a first downlink channel, and the first downlink signal includes frequency adjustment information, and the first downlink channel may be a PDSCH or a PDCCH, etc. The terminal adjusts the frequency of a frequency oscillator of the terminal according to the frequency adjustment information. After adjustment, the maximum value of the frequency error of the terminal after adjustment is less than the maximum value of the frequency error of the terminal before adjustment. Afterwards, the terminal sends a second uplink signal to the access network device on a PUSCH. The maximum signal bandwidth of the second uplink signal is greater than the maximum signal bandwidth of the synchronization signal or the reference signal.

[0191] Of course, in the embodiment of the present application, a first bandwidth set may be configured for the synchronization signal or the reference signal, and a second bandwidth set may be configured for the second uplink signal. The maximum signal bandwidth in the second bandwidth set is greater than the maximum signal bandwidth in the first bandwidth set.

[0192] In one design, the terminal or access network device may determine the maximum signal bandwidth of the first uplink signal and the maximum signal bandwidth of the second uplink signal according to the type of the terminal. The maximum signal bandwidth of the second uplink signal is greater than the maximum signal bandwidth of the first uplink signal. In one implementation, the terminal or access network device may determine the maximum transmission bandwidth of the terminal according to the type of the terminal. For the process of determining the maximum transmission bandwidth of the terminal according to the type of the terminal and the description of the terminal type, please refer to the description in Example 1. The terminal or access network device may determine the maximum signal bandwidth of the first uplink signal and the maximum signal bandwidth of the second uplink signal according to the maximum transmission bandwidth of the terminal. The maximum signal bandwidth of the first uplink signal and the maximum signal bandwidth of the second uplink signal are less than or equal to the maximum transmission bandwidth of the terminal.

[0193] Of course, in an embodiment of the present application, a first bandwidth set may be configured for a first uplink signal, and a second bandwidth set may be configured for a second uplink signal. The maximum signal bandwidth in the first bandwidth set is referred to as the maximum signal bandwidth of the first uplink signal, and the maximum signal bandwidth in the second bandwidth set is referred to as the maximum signal bandwidth of the second uplink signal. In one description, the first bandwidth set and the second bandwidth set may be configured according to the maximum transmission bandwidth of the terminal. Of course, any signal bandwidth included in the first bandwidth set and the second bandwidth set needs to be less than or equal to the maximum transmission bandwidth of the terminal.

[0194] In one implementation, the access network device and the terminal each perform the following process: determine the maximum transmission bandwidth of the terminal according to the type of the terminal. Determine the first bandwidth set and the second bandwidth set according to the maximum transmission bandwidth of the terminal. It can be understood that at this time, the first bandwidth set and the second bandwidth set determined by the access network device and the terminal respectively need to protect the same. Alternatively, the access network device can perform the above process to determine the first bandwidth set and the second bandwidth set. The access network device configures or indicates the first bandwidth set and the second bandwidth set to the terminal. Alternatively, the terminal can perform the above process to determine the first bandwidth set and the second bandwidth set according to the type of the terminal. The terminal reports the first bandwidth set and the second bandwidth set to the access network device, etc. It can be understood that: the above description of determining the first bandwidth set and the second bandwidth set according to the maximum transmission bandwidth of the terminal can be replaced by: determining the maximum signal bandwidth of the first uplink signal and the maximum signal bandwidth of the second uplink signal according to the maximum transmission bandwidth of the terminal.

[0195] In one design, the terminal may report the type of the terminal to the access network device. For example, the terminal may send a message to the access network device, and the message includes the type of the terminal. There is no restriction on the type of the message. For example, the message may be message 1 or message 3 in a 4-step random access process, or message A in a 2-step random access process. The access network device may receive a message from the terminal and obtain the type of the terminal in the message. Alternatively, the terminal may implicitly report the type of the terminal to the access network device through other information associated with the terminal type. For example, the random access preamble may be associated with the type of the terminal. For example, when the type of the terminal is type 1, during the random access process, the terminal reports the random access preamble associated with type 1 to the access network device. The access network device may determine that the type of the terminal is type 1 based on the received random access preamble. Alternatively, the random access resource may be associated with the type of the terminal. For example, when the type of the terminal is type 2, the terminal may use the random access resource associated with type 2 to send the random access preamble to the access network device. The access network device may determine that the type of the terminal is type 2 based on the random access resource of the received random access preamble code.

[0196] It is understood that in the description of the present application: the maximum signal bandwidth may also be referred to as a configurable maximum signal bandwidth, a configurable maximum signal bandwidth, an indicative maximum signal bandwidth, or an indicative maximum signal bandwidth. In addition, it may also be referred to as the maximum signal bandwidth in a configurable maximum signal bandwidth set or the maximum signal bandwidth in an indicative maximum signal bandwidth set.

[0197] Through the above design, the maximum signal bandwidths of different uplink signal configurations are not the same. For example, the terminal first sends the first uplink signal and then sends the second uplink signal. The maximum signal bandwidth of the second uplink signal configuration is greater than the maximum signal bandwidth of the first uplink signal configuration. Compared with the design in which the maximum signal bandwidth of the second uplink signal configuration is the same as the maximum signal bandwidth of the first uplink signal configuration, the transmission efficiency and frequency domain resource utilization of uplink transmissions of different uplink channels and different uplink signals at different uplink transmission stages can be improved.

[0198] Embodiment 3

[0199] The solution of embodiment three: is mainly used to compare the maximum signal bandwidths of two downlink signals. For example, the terminal first receives a first downlink signal from the access network device, and then receives a second downlink signal from the access network device, and the maximum signal bandwidth of the second downlink signal is greater than the maximum signal bandwidth of the first downlink signal. This is mainly due to the following considerations: when the terminal receives the first downlink signal, it can perform frequency correction according to the first downlink signal. After frequency correction, the frequency error of the signal received by the terminal will become smaller. Therefore, thereafter, the maximum signal bandwidth supported by the second downlink signal sent by the access network device to the terminal can be larger. Compared with the second downlink signal and the first downlink signal configured with the same maximum signal bandwidth, the transmission efficiency and frequency domain resource utilization of different downlink transmission stages, different downlink channels, and different downlink signals can be improved. In particular, when the downlink uses a low-power, low-spectral-efficiency modulation method, increasing the effective signal bandwidth can more effectively improve the transmission efficiency. Figure 4 As shown, a process is provided, which at least includes:

[0200] Step 410: The access network device sends a first downlink signal to the terminal on the first downlink channel. The terminal receives the first downlink signal from the access network device on the first downlink channel.

[0201] Step 420: The access network device sends a second downlink signal to the terminal on the second downlink channel. The terminal receives the second downlink signal from the access network device on the second downlink channel.

[0202] In one design, the first downlink signal is configured with a first bandwidth set, and the second downlink signal is configured with a second bandwidth set. The first bandwidth set and the second bandwidth set include at least one signal bandwidth. The maximum signal bandwidth of the first uplink signal may be the maximum signal bandwidth in the first bandwidth set, and the maximum signal bandwidth of the second uplink signal may be the maximum signal bandwidth in the second bandwidth set. In one implementation, the access network device may be configured or instruct that the terminal receives the first downlink signal in a signal bandwidth in the first bandwidth set. The access network device may be configured or instruct that the terminal receives the second downlink signal in a signal bandwidth in the second bandwidth set. There is no restriction on the size relationship between the signal bandwidth for transmitting the first downlink signal and the signal bandwidth for transmitting the second downlink signal.

[0203] In one design, between step 410 and step 420, it also includes: step 430: the terminal performs frequency correction according to the first downlink signal. For example, in one implementation: when the terminal receives the first downlink signal, the frequency of the first downlink signal can be determined by detection. The access network device compares the frequency of the detected first downlink signal with the frequency of the indicated or configured first downlink signal, obtains the frequency difference information between the two, and then determines the frequency error of the first downlink signal. The terminal performs frequency adjustment according to the frequency error of the first downlink signal. After the frequency adjustment, the terminal sends a second downlink signal to the access network device. Since the frequency error of the terminal will become smaller after the frequency adjustment, the maximum signal bandwidth supported by the second uplink signal is greater than the maximum signal bandwidth supported by the first uplink signal. In one implementation, the maximum value of the frequency error of the first uplink signal before adjustment is called the first value, and the maximum value of the frequency error of the second uplink signal after adjustment is called the second value, and the second value is smaller than the first value.

[0204] [Example 1]

[0205] In one design, the first downlink signal is used for at least one of the following: time synchronization, frequency synchronization, or carrying a system message. For example, when the first downlink signal is used for time synchronization, the first downlink signal may be a synchronization signal (SS) or a time synchronization signal (TSS). When the first downlink signal is used for frequency synchronization, the first downlink signal may be a synchronization signal or a frequency synchronization signal (FSS). When the first downlink signal is used for time synchronization and frequency synchronization, the first downlink signal may be a synchronization signal, which is used for both time synchronization and frequency synchronization. Further, the synchronization signal may be a primary synchronization signal (PSS) or a secondary synchronization signal (SSS), etc., without limitation. When the first downlink signal is used to carry a system message, the first downlink signal may be a master information block (MIB) or a system information block (SIB), etc. In one implementation, the first downlink channel may be a physical broadcast channel (PBCH). The second downlink signal includes: a signal carrying downlink data information, or a signal carrying downlink control information. The second downlink channel may be a PDSCH or a PDCCH.

[0206] For example, the first downlink signal is a synchronization signal, and the first downlink channel is PBCH. The second downlink signal is a downlink data signal or a downlink control signal, and the second downlink channel is PDSCH or PDCCH. The synchronization signal corresponds to the first bandwidth set, and the downlink data signal or the downlink control signal corresponds to the second bandwidth set. The access network device can select a signal bandwidth in the first bandwidth set. The synchronization signal is sent to the terminal on the PBCH using the selected signal bandwidth. At the same time, the access network device can configure or indicate the above signal bandwidth to the terminal. The terminal receives the synchronization signal on the PBCH using the configured or indicated signal bandwidth. After receiving the synchronization signal, the terminal can perform frequency correction according to the synchronization signal. After the frequency correction, the maximum value of the frequency error of the terminal will become smaller. Therefore, the maximum signal bandwidth in the second bandwidth set is greater than the maximum signal bandwidth in the first bandwidth set. After that, the access network device can select a signal in the second bandwidth set. The data signal or the control signal is sent to the terminal on the PDSCH or PDCCH using the selected signal bandwidth. At the same time, the access network device can configure or indicate the above signal bandwidth to the terminal. The terminal receives a data signal on the PDSCH or receives a control signal on the PDCCH using the configured or indicated signal bandwidth.

[0207] Under the above design, by calibrating the frequency error of the existing common signals that can be used for periodic transmission, the transmission efficiency and frequency domain resource utilization can be further improved when the downlink data signals and control signals are subsequently transmitted.

[0208] Example 2

[0209] In one design, the first downlink signal is a synchronization signal or a reference signal, and the first downlink channel may be a PDSCH. The second downlink signal may carry downlink data information, or a signal carrying downlink control information, and the second downlink channel may be a PDSCH or a PDCCH. The synchronization signal or the reference signal is a synchronization signal or a reference signal of the second downlink signal, or the synchronization signal or the reference signal is associated with the second downlink signal, or the synchronization signal or the reference signal is used for synchronization between the terminal and the access network device.

[0210] In an asynchronous system, in order to ensure time synchronization between the access network device and the terminal, the access network device needs to send a synchronization signal or a reference signal to the terminal before sending a data signal to the terminal. For example, in one implementation, the access network device sends a synchronization signal or a reference signal to the terminal. When the terminal receives the synchronization signal or the reference signal, the terminal can perform frequency correction on the terminal according to the synchronization signal or the reference signal. After the frequency correction, the frequency error of the terminal will become smaller. Therefore, thereafter, the maximum signal bandwidth supported by the data signal sent by the access network device to the terminal is greater than the maximum signal bandwidth supported by the synchronization signal or the reference signal.

[0211] In the above design, by calibrating the frequency error of the existing common frequency that can be sent together with the data signal, the transmission efficiency and frequency domain resource utilization can be further improved when the downlink data signal and the control signal are subsequently sent.

[0212] In one design, the access network device or the terminal may respectively determine the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the second downlink signal according to the type of the terminal. Of course, the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the second downlink signal determined by the access network device need to be aligned with the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the second downlink signal determined by the terminal. Alternatively, the access network device may determine the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the second downlink signal according to the type of the terminal, and configure or indicate the determined maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the second downlink signal to the terminal. Alternatively, the terminal may determine the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the second downlink signal according to the type of the terminal. The terminal reports the determined maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the second downlink signal to the access network device, etc. In the embodiment of the present application: the description of determining the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the second downlink signal according to the type of the terminal can be replaced by: determining the first bandwidth set of the first downlink signal and the second bandwidth set of the second downlink signal according to the type of the terminal.

[0213] In one implementation, the process of determining the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the second downlink signal according to the type of the terminal includes: determining the maximum transmission bandwidth of the terminal according to the type of the terminal. For the description of the type of the terminal and determining the maximum transmission bandwidth of the terminal according to the type of the terminal, see Example 1. Further, the maximum transmission bandwidth of the first uplink signal and the maximum transmission bandwidth of the second uplink signal can be determined according to the maximum transmission bandwidth of the terminal. The maximum transmission bandwidth of the first uplink signal and the maximum transmission bandwidth of the second uplink signal are less than the maximum transmission bandwidth of the terminal.

[0214] In one design, the terminal may report the type of the terminal to the access network device. For example, the terminal sends a message to the access network device, and the message includes the type of the terminal. For the specific implementation of the terminal reporting the type of the terminal to the access network device, please refer to the description in Example 2, which will not be repeated here.

[0215] In this third embodiment, the maximum signal bandwidth configured for different downlink signals is not the same. For example, the access network device first sends a first downlink signal to the terminal. Since the terminal can adjust the frequency according to the first downlink signal when receiving the first downlink signal, the frequency error of the terminal will become smaller. Therefore, thereafter, the second downlink signal sent by the access network device to the terminal can support a larger maximum signal bandwidth. Compared with configuring the same maximum signal bandwidth for downlink signals, the transmission efficiency and frequency domain resource utilization of different downlink transmission stages, different downlink channels, and different downlink signals can be improved. In particular, when the downlink uses a low-power, low-spectral-efficiency modulation method, increasing the effective signal bandwidth can more effectively improve the transmission efficiency.

[0216] Embodiment 4

[0217] The scheme of the fourth embodiment is mainly used to compare the maximum signal bandwidth of the uplink signal and the downlink signal. Since the terminal receives the downlink signal first when accessing the system, the terminal can perform frequency correction according to the downlink signal. After correction, the maximum value of the frequency error of the terminal becomes smaller. Therefore, the maximum signal bandwidth of the uplink signal can be greater than the maximum signal bandwidth of the downlink signal. Compared with the maximum signal bandwidth configured for the uplink signal and the downlink signal, the uplink signal transmission efficiency and the utilization rate of the frequency domain resources can be improved. Figure 5 As shown, a process is provided, including:

[0218] Step 510: The access network device sends a first downlink signal to the terminal on the first downlink channel. The terminal receives the first downlink signal from the access network device on the first downlink channel.

[0219] Step 520: The terminal sends a first uplink signal to the access network device on the first uplink channel. The access network device receives the first uplink signal from the terminal on the first uplink channel. The maximum signal bandwidth corresponding to the first uplink signal may be greater than the maximum signal bandwidth corresponding to the first downlink signal.

[0220] In one design, between step 510 and step 520, the following is further included: step 530: the terminal performs frequency correction according to the first downlink signal. After the frequency correction, the maximum value of the frequency error of the terminal will become smaller. For example, the maximum value of the frequency error of the first downlink signal is a first value, and the maximum value of the frequency error of the first uplink signal is a second value. Since the terminal performs frequency correction when receiving the first downlink signal. After the frequency correction, the maximum value of the frequency error of the terminal will become smaller, so the second value can be smaller than the first value.

[0221] In one design, the first downlink signal may be a synchronization signal, a signal carrying a system message, a downlink data signal, or a downlink control signal, etc., and the first downlink channel may be a PBCH, a PDCCH, or a PDSCH, etc. The first uplink signal may be a random access preamble, an uplink data signal, or an uplink control signal, etc., and the first uplink channel may be a PRACH, a PUSCH, or a physical uplink control channel (PUCCH), etc.

[0222] For example, the first downlink signal is a synchronization signal, the first downlink channel is PBCH, the first uplink signal is an uplink data signal, and the first uplink signal is PUSCH. The access network device sends a synchronization signal to the terminal on PBCH. When the terminal receives the synchronization signal on PBCH, it performs frequency correction on the terminal according to the synchronization signal. After the frequency correction, the maximum value of the frequency error of the terminal will become smaller. After that, the terminal sends an uplink data signal to the access network device on PUSCH. Due to the frequency correction, the maximum value of the frequency error of the terminal becomes smaller. Therefore, the maximum signal bandwidth corresponding to the uplink data signal is greater than the maximum signal bandwidth corresponding to the synchronization signal.

[0223] In one design, the terminal or access network device may determine the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the first uplink signal of the terminal according to the type of the terminal. The maximum signal bandwidth of the first uplink signal is greater than the maximum signal bandwidth of the first downlink signal. In one implementation, the terminal or access network device may determine the maximum transmission bandwidth of the terminal according to the type of the terminal. For the process of determining the maximum transmission bandwidth of the terminal according to the type of the terminal and the description of the terminal type, please refer to the description in Example 1. The terminal or access network device may determine the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the first uplink signal according to the maximum transmission bandwidth of the terminal. The maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the first uplink signal are less than or equal to the maximum transmission bandwidth of the terminal.

[0224] Of course, in an embodiment of the present application, a first bandwidth set may be configured for the first downlink signal, and a second bandwidth set may be configured for the first uplink signal. The maximum signal bandwidth in the first bandwidth set is referred to as the maximum signal bandwidth of the first downlink signal, and the maximum signal bandwidth in the second bandwidth set is referred to as the maximum signal bandwidth of the first uplink signal. In one description, the first bandwidth set and the second bandwidth set may be configured according to the maximum transmission bandwidth of the terminal. Of course, any signal bandwidth included in the first bandwidth set and the second bandwidth set needs to be less than or equal to the maximum transmission bandwidth of the terminal.

[0225] In one implementation, the access network device and the terminal each perform the following process: determine the maximum transmission bandwidth of the terminal according to the type of the terminal. Determine the first bandwidth set and the second bandwidth set according to the maximum transmission bandwidth of the terminal, etc. It can be understood that at this time, the first bandwidth set and the second bandwidth set determined by the access network device and the terminal respectively need to be protected the same. Alternatively, the access network device can perform the above process to determine the first bandwidth set and the second bandwidth set. The access network device configures or indicates the first bandwidth set and the second bandwidth set to the terminal. Alternatively, the terminal can perform the above process, and the terminal reports the first bandwidth set and the second bandwidth set to the access network device, etc. It can be understood that: the above description of determining the first bandwidth set and the second bandwidth set according to the maximum transmission bandwidth of the terminal can be replaced by: determining the maximum signal bandwidth of the first downlink signal and the maximum signal bandwidth of the first uplink signal according to the maximum transmission bandwidth of the terminal.

[0226] In one design, the terminal may report the type of the terminal to the access network device. For example, the terminal may send a message to the access network device, and the message includes the type of the terminal. There is no restriction on the message. For the specific reporting process, please refer to the description in Example 2.

[0227] In the fourth embodiment, the maximum signal bandwidths configured for the uplink signal and the downlink signal are different. For example, the maximum signal bandwidth of the uplink signal is greater than the maximum signal bandwidth of the downlink signal. Compared with configuring the same maximum signal bandwidth for the uplink signal and the downlink signal, the uplink signal transmission efficiency and the utilization rate of the frequency domain resources can be improved.

[0228] It is understandable that in the embodiments of the present application:

[0229] 1. In addition to focusing on describing the differences between different processes, the descriptions of different processes can refer to each other.

[0230] 2. In Figure 2 , Figure 3 and Figure 4 In the process, the order of different steps is not limited. And in each process, it may include fewer steps or more steps than the flow chart or text description.

[0231] 3. In Figure 2 , Figure 3 and Figure 4 In the process, the terminal and access network device are used as the execution subjects. It can be understood that in each process, the function of the terminal can be implemented by the terminal, or by a module in the terminal (such as a chip or circuit, etc.). The function of the access network device can be implemented by the access network device, or by a module in the access network device (such as a chip or circuit, etc.), or by a logical node, logical module or software that can fully or partially implement the function of the access network device.

[0232] 4. In the embodiments of the present application, "(such as a terminal) receives a signal from (such as an access network device)" can be understood as the source of the signal is the access network device, and the destination is the terminal, which may include the terminal directly or indirectly receiving the signal from the access network device. The signal may be processed as necessary between the source and destination of the signal, such as format changes, but the destination can understand the valid signal from the source. Similar expressions in this application can be understood similarly and will not be repeated here.

[0233] 5. The solution of the embodiment of the present application can be applied to other scenarios in addition to the scenario where the terminal communicates with the access network device. For example, in one design, the solution of the embodiment of the present application can be applied to the scenario where the backscatter terminal communicates with the target device, and the target device can be a reader, a helper, or a series of devices that can excite the backscatter terminal. Optionally, the reader or the helper can be deployed in the access network device. Take the target device as a reader and the backscatter terminal as a tag as an example. The reader and the tag can communicate directly. For example, the reader can send an excitation signal to the tag, and the tag can send a backscatter signal to the reader based on the excitation of the excitation signal. The backscatter signal carries the electronic coding information of the tag. The reader can obtain the electronic coding information of the tag based on the backscatter signal. In this design, the excitation signal sent by the reader to the tag can be considered as a downlink signal, and the backscatter signal sent by the tag to the reader can be considered as an uplink signal. Alternatively, in order to increase the distance of radio frequency identification, an exciter can be set between the tag and the reader. For example, the reader may send a control signal to the exciter, and the exciter sends an excitation signal to the tag according to the control of the control signal. The tag sends a backscatter signal to the reader according to the excitation of the excitation signal. In this design, the control signal sent by the reader to the exciter and the excitation signal sent by the exciter to the tag can be called a downlink signal, and the backscatter signal sent by the tag to the reader can be called an uplink signal. Alternatively, in another design, the solution of the embodiment of the present application can be applied to the scenario where a backscatter terminal communicates with a traditional terminal. The signal sent by the traditional terminal to the backscatter terminal can be called a downlink signal, and the signal sent by the backscatter terminal to the traditional terminal is called an uplink signal.

[0234] 5. The terminals in [Example 1] to [Example 4] may be IoT terminals. Due to the limited power consumption of IoT terminals, the modulation methods that can be used for downlink signals include, but are not limited to: On-Off keying (OOK), amplitude shift keying (ASK), frequency shift keying (FSK), or sequence modulation based on orthogonal frequency division multiplexing (OFDM), etc. The modulation methods that can be used for uplink signals include, but are not limited to: OOK, ASK, FSK, binary phase shift keying (BPSK), differential BPSK, minimum frequency shift keying (MSK), Gaussian minimum frequency shift keying (GMSK), or continuous phase modulation (CPM), etc. The signal formats that can be used for uplink signals include, but are not limited to: single-carrier signals, multi-carrier signals, single-tone signals, or single-tone signals based on OFDM, etc.

[0235] 6. In the description of this article, for a terminal capable of generating an uplink carrier signal, its frequency error is a carrier frequency error, while for a terminal capable of reflecting a downlink carrier signal but not generating an uplink carrier signal, its frequency error is a signal frequency error.

[0236] In the description of this article, a terminal having the ability to reflect a downlink carrier signal but not having the ability to generate an uplink carrier signal may also be referred to as a terminal having only the ability to reflect a downlink carrier signal, a terminal having no ability to generate an uplink carrier signal, a terminal having no ability to generate an uplink carrier signal, or a terminal having only the backscattering capability. In the description of this article, a terminal having the ability to generate an uplink carrier signal may also be referred to as a terminal having the ability to generate an uplink carrier signal.

[0237] In the embodiments provided by the present application, the methods provided by the embodiments of the present application are introduced from the perspective of the interaction between the access network device and the terminal. In order to implement the functions in the methods provided by the embodiments of the present application, the access network device or the terminal may include a hardware structure and / or a software module to implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether a function of the above functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the design constraints of the specific application of the technical solution.

[0238] Figure 6 and Figure 7 The following is a schematic diagram of the structure of possible devices provided in the embodiments of the present application. These communication devices can implement the functions of the access network device or terminal in the above method embodiments. Therefore, the beneficial effects possessed by the above method embodiments may be achieved.

[0239] like Figure 6 As shown, the communication device 600 includes a processing unit 610 and an interface unit 620 .

[0240] Exemplarily, the processing unit 610 may also be referred to as a processor, a processing board, a processing module, a processing device, etc. The interface unit 620 may also be referred to as a transceiver, a transceiver, a transceiver module, a transceiver device, a communication unit, etc. Further, the interface unit 620 may include at least one of a sending unit or a receiving unit. The sending unit and the receiving unit may be integrated together, or may be two independent units, etc.

[0241] In one design, communication device 600 is used to implement Figure 2 Functions of the middle terminal or access network equipment:

[0242] For example, when the communication device 600 is used to implement Figure 2 When the function of the terminal is in the middle: a processing unit 610 is used to determine the maximum transmission bandwidth of the terminal under a first channel bandwidth and a first subcarrier spacing, under which the maximum transmission bandwidth of the terminal is associated with the type of the terminal, and the first channel bandwidth includes the maximum transmission bandwidth and the minimum protection bandwidth; an interface unit 620 is used to transmit signals with an access network device according to the maximum transmission bandwidth of the terminal.

[0243] When the communication device 600 is used to implement Figure 2 The functions of the access network device are as follows: a processing unit 610 is used to determine the maximum transmission bandwidth of the terminal under a first channel bandwidth and a first subcarrier spacing, wherein the maximum transmission bandwidth of the terminal is associated with the type of the terminal under the first channel bandwidth and the first subcarrier spacing, and the first channel bandwidth includes the maximum transmission bandwidth and the minimum protection bandwidth; an interface unit 620 is used to transmit signals with the terminal according to the maximum transmission bandwidth of the terminal.

[0244] In one design, communication device 600 is used to implement Figure 3 Functions of the middle terminal or access network equipment:

[0245] For example, when the communication device 600 is used to implement Figure 3When the function of the middle terminal is: the interface unit 620 is used to send a first uplink signal to the access network device on a first uplink channel; the interface unit 620 is also used to send a second uplink signal to the access network device on a second uplink channel, and the maximum signal bandwidth of the second uplink signal is greater than the maximum signal bandwidth of the first uplink signal. Optionally, the processing unit 610 is used to generate the first uplink signal and the second uplink signal.

[0246] When the communication device 600 is used to implement Figure 3 When the function of the access network device is: the interface unit 620 is used to receive a first uplink signal from a terminal on a first uplink channel; the interface unit 620 is also used to receive a second uplink signal from the terminal on a second uplink channel, and the maximum signal bandwidth of the second uplink signal is greater than the maximum signal bandwidth of the first uplink signal. Optionally, the processing unit 610 is used to process the first uplink signal and the second uplink signal.

[0247] In one design, communication device 600 is used to implement Figure 4 Functions of the middle terminal or access network equipment:

[0248] For example, when the communication device 600 is used to implement Figure 4 When the function of the middle terminal is: the interface unit 620 is used to receive a first downlink signal from the access network device on a first downlink channel; the interface unit 620 is also used to receive a second downlink signal from the access network device on a second downlink channel, and the maximum signal bandwidth of the second downlink signal is greater than the maximum signal bandwidth of the first downlink signal. Optionally, the processing unit 610 is used to process the first downlink signal and the second downlink signal.

[0249] When the communication device 600 is used to implement Figure 4 When the function of the access network device is: the interface unit 620 is used to send a first downlink signal to the terminal on a first downlink channel; the interface unit 620 is also used to send a second downlink signal to the terminal on a second downlink channel, and the maximum signal bandwidth of the second downlink signal is greater than the maximum signal bandwidth of the first downlink signal. Optionally, the processing unit 610 is used to generate the first downlink signal and the second downlink signal.

[0250] In one design, communication device 600 is used to implement Figure 5 Functions of the middle terminal or access network equipment:

[0251] For example, when the communication device 600 is used to implement Figure 5When the function of the middle terminal is: the interface unit 620 is used to receive the first downlink signal from the access network device on the first downlink channel; the interface unit 620 is also used to send the first uplink signal to the access network device on the first uplink channel. The maximum signal bandwidth of the first uplink signal is greater than the maximum signal bandwidth of the first downlink signal. Optionally, the processing unit 610 is used to generate the first uplink signal and / or process the first downlink signal.

[0252] When the communication device 600 is used to implement Figure 5 When the function of the access network device is: the interface unit 620 is used to send a first downlink signal to the terminal on the first downlink channel. The interface unit 620 is also used to receive a first uplink signal from the terminal on the first uplink channel. The maximum signal bandwidth corresponding to the first uplink signal is greater than the maximum signal bandwidth corresponding to the first downlink signal. Optionally, the processing unit 610 is used to generate the first downlink signal and / or process the first uplink signal.

[0253] For a more detailed description of the processing unit 610 and the interface unit 620, reference may be made to the description in the above method embodiment, which will not be repeated here.

[0254] It is understandable that the division of units in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional unit in the embodiments of the present application may be integrated into a physical device (for example, a processor), or each functional unit may be a separate physical device, or two or more units may be integrated into one unit for implementation, and the above-mentioned integrated unit may be implemented in the form of hardware, or in the form of software functional modules, etc.

[0255] Figure 7 Another structural diagram of a communication device 700 provided in an embodiment of the present application is shown. For example, Figure 7 The communication device 700 shown may be Figure 6 A hardware circuit implementation of the communication device 600 shown in FIG. Figure 7 Only the essential parts of the communication device are shown.

[0256] like Figure 7 As shown, the communication device 700 includes a processor 710 and an interface circuit 720. The processor 710 and the interface circuit 720 are coupled to each other.

[0257] For example, the processor 710 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor. The interface circuit 720 may be a transceiver or an input-output circuit, etc.

[0258] Optionally, the communication device 700 may further include a memory 730 for storing instructions executed by the processor 710 or storing input data required by the processor 710 to execute instructions or storing data generated after the processor 710 executes instructions. For example, instructions may also be referred to as computer programs, or computer program codes, etc.

[0259] For example, the memory 730 may be a random access memory (RAM), a flash memory, a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium known in the art.

[0260] When the communication device 700 is used to implement Figure 2 , Figure 3 , Figure 4 or Figure 5 When the method is used for a terminal or access network device in the middle, the processor 710 is used to implement the function of the processing unit 610, and the interface circuit 720 is used to implement the function of the interface unit 620.

[0261] In one design, the interface circuit 720 is used to receive signals from other communication devices other than the communication device 700 and transmit them to the processor 710, or send signals from the processor 710 to other communication devices other than the communication device. The processor 710 implements the above through logic circuits or executes code instructions. Figure 2 , Figure 3 , Figure 4 or Figure 5The function of the terminal or access network equipment.

[0262] The embodiment of the present application also provides a communication device, which includes a processor and a memory, the processor and the memory are coupled, and the processor is used to implement Figure 2 , Figure 3 , Figure 4 or Figure 5 For example, the processor may execute instructions in the memory so that the communication device implements one or more functions in the above method embodiments, such as Figure 2 , Figure 3 , Figure 4 or Figure 5 In one exemplary embodiment, the storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in Figure 2 , Figure 3 , Figure 4 or Figure 5 The processor and storage medium may also exist as discrete components. Figure 2 , Figure 3 , Figure 4 or Figure 5 The terminal or access network equipment in the middle.

[0263] The present application also provides a communication device, which includes a processor, and the processor is used to implement Figure 2 , Figure 3 , Figure 4 or Figure 5 The function of the terminal or access network equipment.

[0264] The present application also provides a computer-readable storage medium, in which instructions are stored. The instructions may also be referred to as computer programs, computer program codes, etc. The instructions are executed on a computer, so that the computer executes the method in the above embodiment. Figure 2 , Figure 3 , Figure 4 or Figure 5 The function of the terminal or access network equipment.

[0265] Optionally, the computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device or other programmable device. The computer program or instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program or instruction may be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disc; it may also be a semiconductor medium, such as a solid-state hard disk. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0266] The present application also provides a computer program product, including a computer program or an instruction. When the computer program or the instruction is executed on a computer, the above Figure 2 , Figure 3 , Figure 4 or Figure 5 The method of the terminal or access network device is executed. For example, the computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on the computer, all or part of the embodiments of the present application are executed. Figure 2 , Figure 3 , Figure 4 or Figure 5 The process or function of a terminal or access network device.

[0267] It is understood that the method in the embodiments of the present application can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, it can be implemented in whole or in part in the form of a computer program product.

[0268] The present application also provides a chip, which includes a processor, the processor is coupled to a memory, and the processor is used to execute a computer program or instruction stored in the memory, so that the chip implements Figure 2 , Figure 3 , Figure 4 or Figure 5For example, taking the chip realizing the function of the access network device as an example, the chip can receive information from other modules of the access network device (such as radio frequency or antenna, etc.), and the information can be sent by the terminal to the access network device. Alternatively, the chip can send information to other modules in the access network device (such as radio frequency or antenna, etc.), and the information can be sent by the access network device to the terminal, etc.

[0269] An embodiment of the present application also provides a communication system, including: a first device and a second device.

[0270] Among them, the first device can realize the above Figure 2 The second device can realize the functions of the above terminal. Figure 2 Alternatively, the first device may implement the above Figure 3 The second device can realize the functions of the terminal in the above text. Figure 3 Alternatively, the first device may implement the above Figure 4 The second device can realize the functions of the terminal in the above text. Figure 4 Alternatively, the first device may implement the above Figure 5 The second device can realize the functions of the terminal in the above text. Figure 5 For the specific structure of the first device or the second device, please refer to the above description, for example Figure 6 or Figure 7 The structure description in .

[0271] In the description of this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship; "including at least one of A, B or C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0272] The various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic.

[0273] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for determining bandwidth, characterized in that: include: Under a first channel bandwidth and a first subcarrier spacing, determine a maximum transmission bandwidth of a terminal, where under the first channel bandwidth and the first subcarrier spacing, the maximum transmission bandwidth of the terminal is associated with a type of the terminal, and the first channel bandwidth includes the maximum transmission bandwidth and a minimum protection bandwidth; Signal transmission is performed with access network equipment according to the maximum transmission bandwidth of the terminal.

2. The method according to claim 1, characterized in that The types of the terminal include: a terminal capable of generating an uplink carrier signal, or a terminal capable of reflecting a downlink carrier signal but not generating an uplink carrier signal.

3. The method according to claim 2, characterized in that The terminals capable of generating uplink carrier signals include terminals whose maximum frequency error is equal to X, and terminals whose maximum frequency error is greater than X, where X is a non-negative number.

4. The method according to claim 3, characterized in that The X is equal to 0.1 parts per million ppm.

5. The method according to any one of claims 2 to 4, characterized in that The maximum transmission bandwidth corresponding to the terminal capable of generating an uplink carrier signal is greater than the maximum transmission bandwidth corresponding to the terminal capable of reflecting a downlink carrier signal but not generating an uplink carrier signal.

6. The method according to any one of claims 3 to 5, characterized in that The maximum transmission bandwidth corresponding to the terminal whose maximum frequency error is equal to X is greater than the maximum transmission bandwidth corresponding to the terminal whose maximum frequency error is greater than X.

7. The method according to any one of claims 1 to 6, characterized in that The maximum transmission bandwidth of the terminal includes a maximum downlink transmission bandwidth of the terminal and a maximum uplink transmission bandwidth of the terminal, and the maximum uplink transmission bandwidth of the terminal is greater than the maximum downlink transmission bandwidth of the terminal.

8. A method for determining bandwidth, characterized in that: include: Under a first channel bandwidth and a first subcarrier spacing, determine a maximum transmission bandwidth of a terminal, where under the first channel bandwidth and the first subcarrier spacing, the maximum transmission bandwidth of the terminal is associated with a type of the terminal, and the first channel bandwidth includes the maximum transmission bandwidth and a minimum protection bandwidth; Signal transmission is performed with the terminal according to the maximum transmission bandwidth of the terminal.

9. The method according to claim 8, characterized in that The types of the terminal include: a terminal capable of generating an uplink carrier signal, or a terminal capable of reflecting a downlink carrier signal but not generating an uplink carrier signal.

10. The method according to claim 9, characterized in that The terminals capable of generating uplink carrier signals include terminals whose maximum frequency error is equal to X, and terminals whose maximum frequency error is greater than X, where X is a non-negative number.

11. The method according to claim 10, characterized in that The X is equal to 0.1 parts per million ppm.

12. The method according to any one of claims 9 to 11, characterized in that The maximum transmission bandwidth corresponding to the terminal capable of generating an uplink carrier signal is greater than the maximum transmission bandwidth corresponding to the terminal capable of reflecting a downlink carrier signal but not generating an uplink carrier signal.

13. The method according to any one of claims 10 to 12, characterized in that The maximum transmission bandwidth corresponding to the terminal whose maximum frequency error is equal to X is greater than the maximum transmission bandwidth corresponding to the terminal whose maximum frequency error is greater than X.

14. The method according to any one of claims 8 to 13, characterized in that The maximum transmission bandwidth of the terminal includes a maximum downlink transmission bandwidth of the terminal and a maximum uplink transmission bandwidth of the terminal, and the maximum uplink transmission bandwidth of the terminal is greater than the maximum downlink transmission bandwidth of the terminal.

15. A device, characterized in that: include: A unit for implementing the method according to any one of claims 1 to 7.

16. A device, characterized in that: The device comprises a processor configured to execute instructions so that the device performs the method according to any one of claims 1 to 7.

17. A device, characterized in that: The device comprises a processor and an interface circuit, wherein the interface circuit is used to receive signals from other devices outside the device and transmit them to the processor or send signals from the processor to other devices outside the device, and the processor is used to implement the method as described in any one of claims 1 to 7 through a logic circuit or executing code instructions.

18. A device, characterized in that: include: A unit for implementing the method according to any one of claims 8 to 14.

19. A device, characterized in that: The device comprises a processor configured to execute instructions so that the device performs the method according to any one of claims 8 to 14.

20. A device, characterized in that: It includes a processor and an interface circuit, wherein the interface circuit is used to receive signals from other devices outside the device and transmit them to the processor or send signals from the processor to other devices outside the device, and the processor is used to implement the method as described in any one of claims 8 to 14 through logic circuits or execution code instructions.

21. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions, and the instructions are executed on a computer to enable the computer to perform the method according to any one of claims 1 to 7, or the method according to any one of claims 8 to 14.

22. A chip, characterized in that: The chip comprises a processor, which is coupled to a memory and is used to execute a computer program or instruction stored in the memory, so that the chip implements the method of any one of claims 1 to 7, or the method of any one of claims 8 to 14.

23. A system, characterized in that: include: a first device and a second device; Wherein, the first device is used to implement the method according to any one of claims 1 to 7; The second device is used to implement the method according to any one of claims 8 to 14.

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