Information transmission method and communication device

Abstract

This application provides an information transmission method and a communication device. The method includes: a terminal device receives a first signal transmitted by a first network device based on a bandwidth of the first signal, the first signal includes N first symbols, the modulation scheme of the first symbols is ASK or OOK modulation, N is a positive integer, the first signal is an orthogonal frequency division multiplexing OFDM signal, the terminal device determines a duration of the first symbol, the duration of the first symbol is one of at least one duration of the first symbol associated with the bandwidth of the first signal, and the terminal device determines information bits carried by the N first symbols based on the duration of the first symbol. Based on the method described in this application, there is a related relationship between the bandwidth of the first signal and the duration of the first symbol. Based on the related relationship, the first signal can be transmitted by using a small bandwidth when information transmission efficiency and information transmission performance are ensured, thereby improving network frequency domain resource utilization.

Description

[Technical Field]

[0001] This application claims priority to Chinese Patent Application No. 202111678965.2, entitled "Information Transmission Method and Communication Apparatus," filed with the State Intellectual Property Office of China on December 31, 2021, which is incorporated herein by reference in its entirety.

[0002] This application relates to the field of communication technology, and in particular to information transmission methods and communication devices. [Background technology]

[0003] The IEEE 802.11 standards organization began discussing wake-up radio (WUR)-related content in 2017 and decided on IEEE 802.11ba as the IEEE WUR standard. IEEE 802.11ba proposes that a terminal device have two receivers: a primary receiver and a secondary receiver. The primary receiver is similar to the orthogonal frequency division multiplexing (OFDM) signal receiver of a conventional cellular terminal device, with no obvious modifications. The secondary receiver must be designed as a WUR receiver with a power consumption of less than 1 milliwatt (mW). The network device transmits an amplitude shift keying (ASK) / on-off keying (OOK) modulated signal, which presents an ON / OFF waveform in the time domain, to the secondary receiver. After receiving the signal, unlike conventional cellular OFDM signal receivers, the secondary receiver does not perform coherent demodulation using a signal generated by a high-frequency local oscillator, but instead performs incoherent demodulation using an envelope detector based on the amplitude envelope of the signal. Because the secondary receiver does not need to generate a high-frequency local oscillator signal, its power consumption is significantly reduced. The secondary receiver wakes up the primary receiver only after successfully demodulating the data information using the envelope detector. After being woken up, the receiver performs information transmission (e.g., listens for paging messages).

[0004] In new radio (NR) access systems, the 3rd Generation Partnership Project (3GPP®) Release 18 standard discussion proposes using an NR OFDM system to generate OOK / ASK signals, allowing the receiver of a terminal device to perform envelope detection and thereby achieving energy saving effects. However, after the OOK / ASK signal generation solution is introduced into the NR OFDM system, how to improve network frequency domain resource utilization while ensuring OOK / ASK signal transmission efficiency is currently an urgent problem to be solved. Summary of the Invention [Means for solving the problem]

[0005] This application provides an information transmission method and a communication device that are useful for improving network frequency domain resource utilization while ensuring OOK / ASK signal transmission efficiency.

[0006] According to a first aspect, the present application provides an information transmission method, the method including:

[0007] A terminal device receives a first signal transmitted by a first network device based on a bandwidth of the first signal, the first signal including N first symbols, the modulation scheme of the first symbols being amplitude shift keying (ASK) modulation or on-off keying (OOK) modulation, N being a positive integer, the first signal being an orthogonal frequency division multiplexing (OFDM) signal, the terminal device determines a duration of the first symbols, the duration of the first symbols being one of at least one first symbol duration associated with the bandwidth of the first signal, and the terminal device determines information bits carried in the N first symbols based on the duration of the first symbols.

[0008] According to the method described in the first aspect, there is a correlation relationship between the bandwidth of the first signal and the duration of the first symbol (the modulation method is ASK modulation or OOK modulation). According to the correlation relationship, the first signal can be transmitted by using a small bandwidth when information transmission efficiency and information transmission performance are ensured, thereby improving network frequency domain resource utilization.

[0009] In a possible implementation, the duration of at least one first symbol associated with the bandwidth of the first signal is predefined, or the duration of the at least one first symbol associated with the bandwidth of the first signal is configured by the first network device by using configuration information, where the configuration information is carried in radio resource control (RRC) signaling or medium access control (MAC) signaling. Predefining the association relationship between the bandwidth of the first signal and the duration of the first symbol helps to reduce network resource overhead. The first network device configures the association relationship between the bandwidth of the first signal and the duration of the first symbol, which helps to flexibly update the association relationship between the bandwidth of the first signal and the duration of the first symbol.

[0010] In a possible implementation, a terminal device receives a second signal, the second signal indicating one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal.

[0011] Based on this possible implementation, the network device can flexibly indicate to the terminal device one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal. In this way, there may be multiple adjustable types of information transmission rates, and information transmission is more flexible.

[0012] In a possible implementation, the second signal further indicates a first field, the first field including one or more of the following: a coding multiple of a line code of the first signal, a channel coding code rate of the first signal, or a bit repetition number of the first signal; and the terminal device determining, based on the duration of the first symbol, the information bits carried in the N first symbols includes the terminal device determining, based on the duration of the first symbol and the first field, the information bits carried in the N first symbols.

[0013] In this possible implementation, line code coding and / or repetition coding and / or channel coding are introduced to further improve information transmission performance. In addition, based on this possible implementation, the network device may indicate a coding multiple of the line code of the first signal, a channel coding code rate of the first signal, or a bit repetition number of the first signal. The coding multiple of the line code of the first signal, the channel coding code rate of the first signal, or the bit repetition number of the first signal may be adjusted rather than fixed, thereby improving the flexibility of information transmission.

[0014] In a possible implementation, the second signal may be further used by the terminal device to perform time and frequency synchronization. That is, the second signal may be a synchronization signal. The use of the synchronization signal allows for more flexible and dynamic adjustment of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal, thereby improving the flexibility of data signal transmission.

[0015] In a possible implementation, the second signal includes M identical third signals in the time domain, where the value of M indicates one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal, and M is a positive integer. In this way, the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal can be accurately indicated.

[0016] In a possible implementation, the second signal includes M identical third signals, and time-domain masks on the M third signals indicate one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal, where M is a positive integer. In this way, the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal can be accurately indicated. The time-domain mask indication information superimposed on multiple concatenated identical synchronization signals can maximize the flexibility of dynamically adjusting data signal transmission while ensuring the time-frequency synchronization performance of terminal devices.

[0017] In a possible implementation, the second signal includes Q second symbols, the modulation scheme of the second symbols is ASK modulation or OOK modulation, Q is a positive integer, the second signal is an OFDM signal, and there is a correlation between the bandwidth of the second signal and the duration of one second symbol. The terminal device may further determine information bits carried by the Q second symbols based on the duration of the second symbol associated with the bandwidth of the second signal. Based on this possible implementation, there is also a correlation between the bandwidth of the second signal and the duration of the second symbol, so that the second signal can be transmitted using a small bandwidth while ensuring information transmission efficiency and information transmission performance, thereby improving network frequency domain resource utilization.

[0018] In a possible implementation, the bandwidth of the second signal and the duration of the second symbol associated with the bandwidth of the second signal are predefined.

[0019] In a possible implementation, the second signal is further used to carry RRC signaling or MAC signaling transmitted by the first network device. The transmission of the data signal is quasi-statically adjusted. For terminal devices with low mobility, the signaling overhead can be reduced and the transmission of the data signal can be maintained for a certain period of time.

[0020] In a possible implementation, the terminal device transmits a third signal to the first network device, and the third signal indicates one or more of the following information: a signal coverage level of the terminal device, a measured reference signal received power RSRP, a transmission rate required by the terminal device, or information indicating whether the terminal device supports channel coding. Based on this possible implementation, the network device can select an optimal duration of the first symbol for the terminal device for transmission based on the actual coverage level, actual channel decoding capability, etc. when the coverage requirement is met, thereby ensuring high information transmission efficiency.

[0021] According to a second aspect, the present application provides an information transmission method, the method including:

[0022] A first network device transmits a first signal to a terminal device, the first signal including N first symbols, the modulation scheme of the first symbols is amplitude shift keying (ASK) modulation or on-off keying (OOK) modulation, N is a positive integer, the first signal is an orthogonal frequency division multiplexing (OFDM) signal, and the duration of the first symbols is one of at least one first symbol duration associated with a bandwidth of the first signal.

[0023] In a possible implementation, the duration of the at least one first symbol associated with the bandwidth of the first signal is predefined, or the duration of the at least one first symbol associated with the bandwidth of the first signal is configured by the first network device by using configuration information, and the configuration information is carried in radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0024] In a possible implementation, the first network device transmits a second signal to the terminal device, the second signal indicating one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal.

[0025] In a possible implementation, the second signal further indicates a first field, which includes one or more of the following: a coding multiple of the line code of the first signal, a channel coding code rate of the first signal, or a bit repetition number of the first signal.

[0026] In a possible implementation, the second signal is further used by the terminal device to perform time and frequency synchronization.

[0027] In a possible implementation, the second signal includes M identical third signals in the time domain, where the value of M indicates one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal, and M is a positive integer.

[0028] In a possible implementation, the second signal includes M identical third signals, and a time-domain mask on the M third signals indicates one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal, where M is a positive integer.

[0029] In a possible implementation, the second signal includes Q second symbols, the modulation scheme of the second symbols is ASK modulation or OOK modulation, Q is a positive integer, the second signal is an OFDM signal, and there is a correlation between the bandwidth of the second signal and the duration of one second symbol.

[0030] In a possible implementation, the bandwidth of the second signal and the duration of the second symbol associated with the bandwidth of the second signal are predefined.

[0031] In a possible implementation, the second signal carries RRC signaling or MAC signaling transmitted by the first network device.

[0032] In a possible implementation, before the first network device transmits the second signal to the terminal device, the method includes:

[0033] The first network device receives a fourth signal transmitted by the second network device, the fourth signal indicating one of a bandwidth of the first signal and / or a duration of at least one first symbol associated with the bandwidth of the first signal.

[0034] In a possible implementation, before the first network device receives the fourth signal transmitted by the second network device, the method includes:

[0035] The first network device receives a third signal transmitted by the terminal device, the third signal indicating one or more of the following information: a signal coverage level of the terminal device, a measured reference signal received power RSRP, a transmission rate requested by the terminal device, or information indicating whether the terminal device supports channel coding, and the first network device transmits the third signal to the second network device.

[0036] The beneficial effects of the second aspect are described in the beneficial effects of the first aspect, and will not be described in detail here.

[0037] According to a third aspect, this application provides a communication device. The communication device may be a terminal device, a device within a terminal device, or a device that can be used for matching with a terminal device. Alternatively, the communication device may be a chip system. The communication device may perform the method according to the first aspect. The functionality of the communication device may be implemented by hardware, or by hardware executing corresponding software. The hardware or software may include one or more units or modules corresponding to the aforementioned functionality. The units or modules may be software and / or hardware. For operations and beneficial effects performed by the communication device, please refer to the method and beneficial effects of the first aspect.

[0038] According to a fourth aspect, this application provides a communication device. The communication device may be a first network device, a device within the first network device, or a device that can be used for matching with the first network device. Alternatively, the communication device may be a chip system. The communication device can perform the method according to the second aspect. The functions of the communication device may be implemented by hardware, or by hardware executing corresponding software. The hardware or software may include one or more units or modules corresponding to the aforementioned functions. The units or modules may be software and / or hardware. For operations and beneficial effects performed by the communication device, please refer to the method and beneficial effects of the second aspect.

[0039] According to a fifth aspect, the present application provides a communications device, the communications device including a processor, the processor invoking a computer program in a memory to perform the method of the first or second aspect.

[0040] According to a sixth aspect, the application provides a communications device, comprising a processor and a memory, the processor coupled to the memory, the processor configured to perform a method according to the first or second aspect.

[0041] According to a seventh aspect, the application provides a communications device, the communications device including a processor, a memory, and a transceiver, the processor coupled to the memory, the transceiver configured to transmit and receive data, and the processor configured to perform a method according to the first or second aspect.

[0042] According to an eighth aspect, the application provides a communications device, comprising a processor and an interface, the interface configured to receive or output signals, and the processor configured to implement a method according to the first or second aspect by using logic circuits or by executing code instructions.

[0043] According to a ninth aspect, the present application provides a computer-readable storage medium, the storage medium storing a computer program or instructions, the computer program or instructions, when executed by a communication device, performing the method of any one of the first to sixth aspects.

[0044] According to a tenth aspect, the present application provides a computer program product comprising instructions that, when read and executed by a computer, enable the computer to perform the method of any one of the first to sixth aspects. [Brief explanation of the drawings]

[0045] [Figure 1] 1 is a diagram of an ASK / OOK modulation symbol generation method according to the present application. [Figure 2] 1 is a diagram of the interaction between a reader and a tag according to the present application; [Figure 3] 1 is a diagram of a communication system according to the present application; [Figure 4] 1 is a diagram of an information transmission method according to the present application. [Figure 5] 1 is a diagram of transmission performance according to the present application. [Figure 6] 10 is a diagram of another type of transmission performance according to the present application. [Figure 7] FIG. 10 is yet another transmission performance diagram according to the present application. [Figure 8] FIG. 1 is a diagram of another information transmission method according to the present application. [Figure 9] FIG. 10 is yet another transmission performance diagram according to the present application. [Figure 10] FIG. 1 is a diagram of signal bandwidth and symbol duration according to the present application. [Figure 11] FIG. 2 is another diagram of signal bandwidth and symbol duration according to the present application. [Figure 12] FIG. 10 is yet another diagram of signal bandwidth and symbol duration according to the present application. [Figure 13] FIG. 10 is a diagram of yet another information transmission method according to the present application. [Figure 14] FIG. 10 is a diagram of yet another information transmission method according to the present application. [Figure 15] 1 is a diagram of the structure of a communication device according to this application; [Figure 16] FIG. 1 is a diagram of the structure of another communication device according to the present application. [Figure 17] 1 is a diagram of the structure of a chip according to this application. DETAILED DESCRIPTION OF THE INVENTION

[0046] Specific embodiments of the present application will now be described in further detail with reference to the accompanying drawings.

[0047] In the specification, claims, and accompanying drawings of this application, terms such as "first," "second," etc. are used to distinguish between different objects, but not to describe a particular order. Furthermore, the terms "comprise" and "have," as well as any other variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include unlisted steps or units, or may optionally further include other specific steps or units of the process, method, product, or device.

[0048] The term "embodiment" referred to in this specification indicates that a particular feature, structure, or characteristic described with reference to this embodiment may be included in at least one embodiment of this application. Phrases appearing in various places in this specification may not necessarily refer to the same embodiment, and are not independent or optional embodiments independent of other embodiments. It is explicitly and implicitly understood by those skilled in the art that an embodiment described in this specification may be combined with another embodiment.

[0049] In this application, "at least one (item)" means one or more, "multiple" means two or more, and "at least two (items)" means two or more. The term "and / or" is used to describe a relationship between related objects and indicates that a three-way relationship may exist. For example, "A and / or B" may indicate the following three cases: only A is present, only B is present, or both A and B are present, where A and B may be singular or plural. The symbol " / " generally indicates an "or" relationship between related objects. "At least one of the following items (moieties)" or similar expressions refers to any combination of these items and includes any combination of a singular item (moiety) or multiple items (moieties). For example, "at least one of a, b, or c" may refer to a, b, c, a and b, a and c, b and c, or a, b, and c, where a, b, and c may be singular or plural.

[0050] In order to better understand the embodiments of this application, the following will first describe the relevant technical features in the embodiments of this application. Please note that these descriptions are intended to make the embodiments of this application easier to understand, but should not be considered as limiting the scope of protection claimed in this application.

[0051] 1. Wake-up radio (WUR) In the era of fourth-generation (4G) mobile communication technology, the 3rd Generation Partnership Project (3GPP®) has introduced the narrow-band Internet of Things (NB-IoT) system. In this system, a terminal device may be permitted to transmit data using a single subcarrier. The NB-IoT system also supports a wake-up signal (WUS). Specifically, the terminal device wakes up only after receiving a wake-up signal from a network device to receive data information from the network device. In this way, the terminal device can sleep for a longer period of time and does not need to wake up frequently to listen for messages, such as paging messages. This further reduces the power consumption of the terminal device, achieving further energy-saving effects for the terminal device. However, even though the above technologies can reduce the power consumption of an NB-IoT device, the receiver of the NB-IoT terminal device is an OFDM signal receiver, which consumes high power. Therefore, the power consumption reduction of the NB-IoT device reaches a bottleneck, preventing further power consumption reduction.

[0052] Therefore, the IEEE 802.11 standards organization began reviewing WUR-related content in 2017 and decided to name the IEEE WUR standard IEEE 802.11ba. IEEE 802.11ba proposes that terminal devices have two receivers: a primary receiver and a secondary receiver. The primary receiver is similar to the OFDM signal receiver in conventional cellular terminal devices, with no significant modifications. The secondary receiver must be designed as a WUR receiver with a power consumption of less than 1 milliwatt (mW). The network device transmits ASK / OOK modulation symbols, which present an ON / OFF waveform in the time domain, to the secondary receiver. After receiving the signal, unlike conventional cellular OFDM signal receivers, the secondary receiver does not perform coherent demodulation using a signal generated by a high-frequency local oscillator (HFLO), but instead performs incoherent demodulation using an envelope detector based on the signal's amplitude envelope. Because the secondary receiver does not need to generate a HFLO signal, its power consumption is significantly reduced. The secondary receiver wakes up the primary receiver only after it successfully demodulates the data information using an envelope detector. After waking up, the receiver performs an information transmission (e.g., listens for paging messages).

[0053] The IEEE 802.11ba protocol allows terminal devices to operate at frequencies of 2.4 GHz or 5 GHz. Additionally, IEEE 802.11ba supports a subcarrier spacing of 312.5 kHz and an OFDM symbol duration of 4 μs (microsecond) symbols (high data rate, HDR) and 2 μs symbols (low data rate, LDR). For example, the OFDM symbol duration is 4 μs. As shown in Figure 1, in IEEE 802.11ba, a WUR signal occupies the 13 center subcarriers of a 20 MHz system, occupying a bandwidth of approximately 4.06 MHz. A sequence containing 12 elements is mapped to 12 of the 13 subcarriers, excluding the center subcarrier (subcarrier #0). The elements of the sequence may be selected from binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (16QAM), 64QAM, and 256QAM modulation constellation points. After the 13 subcarriers map all elements in the sequence, the OFDM transmitter performs an inverse fast Fourier transformation (IFFT) and CP addition operation to generate an OFDM symbol. The terminal device considers the OFDM symbol to carry one ON symbol, i.e., the subreceiver uses an envelope detector to determine the bit "1" transmitted in the ON symbol. If no information is transmitted in the 13 center subcarriers, i.e., if "0" is transmitted in the 13 subcarriers, the generated OFDM symbol is also an energy-free "0" signal after the OFDM transmitter's IFFT and CP addition operation. The terminal device considers the OFDM symbol to carry an OFF symbol, ie the secondary receiver uses an envelope detector to determine the bit "0" transmitted in the OFF symbol.It can be seen that in the IEEE 802.11ba protocol, one OFDM symbol carries one ASK / OOK modulation symbol. IEEE 802.11ba supports Manchester line coding. For a 4 μs symbol, information bit 0 is coded as 1010, and information bit 1 is coded as 0101. Therefore, four ON / OFF symbols are required to transmit one piece of information, and the information transmission rate is 1 bit / (4*4 μs)=62.5 kbps.

[0054] 2. Passive IoT Passive IoT is an important research direction in the 5G / 5.5G IoT field. In a passive IoT system, a reader transmits a waveform containing a continuous high level to a passive tag. After receiving the energy, the tag reflects information back to the reader via a reverse link. According to the radio frequency identification (RFID) air interface protocol ISO 18000-6C, tag reflection uses dynamic slotted ALOHA technology. As shown in Figure 2, the specific communication process between the reader and tag is as follows:

[0055] (1) Tag Selection Process The reader first sends select signaling and uses the signaling to select tags / tag groups to be stored and accessed.

[0056] (2) Tag inventory process: The reader sends a query signaling to the selected stored tag, and the query signaling includes a parameter Q. After receiving the query signaling, the stored tag QThe network device selects a random number from the range of 0-1 (-1) and loads the random number into the tag's slot counter. Tags that select a non-zero value are transferred to the arbitration state, while tags that select a zero value enter the response state and respond with RN 16. The reader then responds with an ACK command acknowledgment tag containing the same RN 16. The confirmed tag is transferred to the confirmed state and responds with the tag's identification information, such as an electronic product code (EPC), to complete the tag's basic information inventory process. After successfully receiving the identification information, the network device ends this slot, enters the next slot, and starts sending query repeat (queryrep) signaling or query adjust (queryadjust) signaling. Figure 2 uses an example in which the network device sends queryrep signaling. When a tag in the confirmed state receives queryrep signaling or queryadjust signaling, the tag's inventory flag is reversed, the tag is transferred to the ready state, and this round of inventory process is completed.

[0057] The queryrep signaling operation without changing parameters is the same as the previous query signaling operation. Each time a queryrep signaling is received, the slot counter value of the tag in arbitration state is decreased by one. In this case, the tag whose slot counter value has reached 0 repeats the same response process as described above. The previous query operation is repeated for a queryadjust signaling, and Q can be increased or decreased. Also, when a tag in arbitration state receives a queryadjust signaling, it adjusts its Q value to (0,2 Q A tag selects a random number in the range -1) and loads it into the tag's slot counter. In this case, a tag that selects a non-zero value will transition to the arbitration state, and a tag that selects a value of 0 will enter the response state.

[0058] Similar to the WUR sub-receiver, the passive IoT tag receiver essentially demodulates the ASK / OOK modulation symbols using an envelope detector receiver. Thus, the aforementioned signaling is transmitted using ASK / OOK modulation symbols, and the tag detects the corresponding ASK / OOK modulation symbols and then demodulates the meaning of each field parameter in the signaling to determine the meaning of the signaling.

[0059] The standard discussion in 3GPP® Release-18 proposes that WUR-related technologies and passive IoT-related technologies be supported in NR systems. If the method for generating ASK / OOK modulation symbols in the IEEE 802.11ba standard is directly implemented in NR WUR or NR passive IoT, the duration of one ASK / OOK modulation symbol will change from 4 μs to 66.7 μs because NR only supports subcarrier spacings of 15 kHz, 30 kHz, and 60 kHz in the FR1 frequency band. If one ASK / OOK modulation symbol is still carried on one OFDM symbol in the IEEE 802.11ba protocol, the information transmission rate is much lower than that of WUR in the IEEE 802.11ba protocol. For example, when the subcarrier spacing is 15 kHz, the information transmission rate of NR WUR or NR passive IoT is 312.5 / 15≒20 times lower than that of WUR in the IEEE 802.11ba protocol. As a result, the information transmission efficiency of NR WUR or NR passive IoT is excessively low. Multiple ASK / OOK modulation symbols can be carried on a time-domain OFDM symbol through time-domain or frequency-domain design, which effectively improves information transmission efficiency. However, when multiple ASK / OOK modulation symbols are carried on one time-domain OFDM signal, the information transmission performance may be degraded if the transmission bandwidth is small. If the transmission bandwidth is too large, the network frequency-domain resource utilization rate is low.

[0060] In order to improve network frequency domain resource utilization, this application provides an information transmission method and a communication device. In the following, the system architecture in the embodiment of this application will be described first.

[0061] 3 is a diagram of a communication system according to an embodiment of this application. As shown in FIG. 3, the communication system includes a terminal device 30 and an access network device 31. Optionally, the communication system further includes a core network device 32. The number of terminal devices is merely an example, and in this embodiment of this application, the number of terminal devices is not particularly limited.

[0062] The terminal devices and network devices of FIG. 1 will be described in detail below.

[0063] 1. Terminal Device A terminal device is a device with wireless transceiver capability at the user's side and can be deployed on land, where deployment includes indoor or outdoor, handheld, wearable, or vehicle-mounted deployment, can be deployed on water (e.g., in a ship), or can be deployed in the air (e.g., in an airplane, balloon, and satellite).

[0064] The terminal device has a receiver with an ASK / OOK modulation symbol receiving function or an envelope detection function, or the terminal device has a main receiver and a secondary receiver. The main receiver is the same as an OFDM signal receiver of a conventional cellular terminal device, and no obvious changes are made. The secondary receiver is a receiver with an ASK / OOK modulation symbol receiving function or an envelope detection function.

[0065] For example, the terminal device may specifically be a mobile phone, a tablet, a computer with a wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal for industrial control, an in-vehicle terminal device, a wireless terminal for self-driving, a wireless terminal for remote medical, a wireless terminal for smart grid, a wireless terminal for transportation safety, a wireless terminal for smart city, a passive tag, a semi-passive tag, an energy storage tag, an active tag, an industrial network sensor, a video surveillance camera, a wearable device (smart watch), a water meter, an electricity meter, and other smart home wireless terminals and tags. The application scenarios are not limited to the embodiments of this application. A terminal may also be called a terminal device, user equipment (UE), access terminal device, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, mobile station, remote station, remote terminal device, mobile device, UE terminal device, terminal device, wireless communication device, UE agent, UE equipment, etc. Alternatively, a terminal may be fixed or mobile.

[0066] 2.2. Access Network Devices An access network device is an entity configured to transmit or receive signals on the network side, and examples of the access network device include, but are not limited to, a new generation NodeB (gNB), an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a wireless backhaul device, a radio network controller (RNC), a NodeB (NB), a base station controller (BSC), a base transceiver station (BTS), a home evolved NodeB (HeNB) or a home NodeB (HNB), a baseband unit (BBU), a transmission reception point (TRP), a transmission point (TP), a mobile switching center, and an entity that transmits signals to a tag terminal device, such as a reader, in a 5G communication system.

[0067] 3. Core Network Devices A core network (CN) may include one or more CN devices. A 5G communication system is used as an example. The CN may include an access and mobility management function (AMF) network element, a session management function (SMF) network element, a user plane function (UPF) network element, a policy control function (PCF) network element, a unified data management (UDM) network element, an application function (AF) network element, etc.

[0068] In addition, the CN may further include other possible network elements, such as a network exposure function (NEF) network element, a unified data repository (UDR) network element, or a network data analytics function (NWDAF) network element.

[0069] In this application, the access network device and the core network device are collectively referred to as network devices. Hereinafter, the access network device is referred to as a first network device, and the core network device is referred to as a second network device.

[0070] It can be understood that a 5G communication system is used as an example for illustrating FIG. 3 . The solutions in the embodiments of this application can also be applied to other possible communication systems, for example, an LTE communication system or a future sixth-generation (6G) communication system. The aforementioned network elements of functions may be network elements in a hardware device, software functions running on dedicated hardware, or virtualized functions instantiated on a platform (e.g., a cloud platform). Optionally, the network elements or functions may be implemented by one device, or may be jointly implemented by multiple devices, or may be functional modules in one device. This is not specifically limited in the embodiments of this application.

[0071] The information transmission method and communication device provided in the embodiments of this application are described in further detail below.

[0072] FIG. 4 is a schematic flowchart of an information transmission method according to an embodiment of the present application. As shown in FIG. 4, the information transmission method includes the following steps 401 to 404. The method shown in FIG. 4 may be performed by a terminal device and a first network device (access network device), or may be performed by a chip in the terminal device and a chip in the first network device. In FIG. 4, an example in which the method is performed by the terminal device and the first network device is used for explanation. Furthermore, the processing performed by a single executing entity shown in FIG. 4 may be performed by multiple executing entities through division, and these executing entities are logically and / or physically separated. For example, the processing performed by the access network device may be performed by at least one of a central unit (CU), a distributed unit (DU), and a radio unit (RU) through division.

[0073] 401: A first network device transmits a first signal to a terminal device.

[0074] The first signal includes N first symbols, a modulation scheme of the first symbols is ASK modulation or OOK modulation, N is a positive integer, the first signal is an OFDM signal, and a duration of the first symbols is one of at least one first symbol duration associated with a bandwidth of the first signal.

[0075] In this embodiment of the present application, there is a relationship between the bandwidth of the first signal and the duration of the first symbol. One bandwidth of the first signal may be associated with at least one duration of the first symbol. The first signal is an OFDM signal corresponding to one OFDM symbol. Alternatively, the duration of the first symbol may be a relationship between the symbol duration of the first symbol, the symbol rate of the first symbol, and the duration of the first symbol and the duration of the first signal. The first signal includes or conveys a relationship between the number of first symbols, for example, the ratio of the duration of the first symbol to the duration of the first signal. For example, the first signal is an OFDM signal with a subcarrier spacing of 15 kHz and corresponds to one OFDM symbol. The first signal includes eight first symbols. The duration of the first symbol is 1 / 8 of the duration of the first signal. The first signal is a signal corresponding to one OFDM symbol with no cyclic prefix (CP), a subcarrier spacing of 15 kHz, and a duration of 66.7 μs, where the duration of the first symbol is 66.7 μs / 8=8.33 μs, and the symbol rate of the first symbol is 120 kbps.

[0076] Optionally, the duration of one first symbol is associated with one bandwidth of the first signal. Optionally, if the first bandwidth of the first signal is larger than the second bandwidth of the first signal, the duration of the first symbol associated with the first bandwidth is longer than the duration of the first symbol associated with the second bandwidth. For example, as shown in Table 1 below, the duration of the first symbol is 66.7 μs, 33.3 μs, 16.67 μs, or 8.33 μs. That is, the first signal includes 1, 2, 4, or 8 first symbols, or the ratio of the duration of the first symbol to the duration of the first signal is 1, 1 / 2, 1 / 4, or 1 / 8. The duration of the first symbol of 66.7 μs, 33.3 μs, 16.67 μs, or 8.33 μs is associated with a bandwidth of 1 RB of the first signal. The duration of the first symbol is 5.55 μs, 4.16 μs, or 3.33 μs. That is, the first signal includes 12, 16, or 20 first symbols, or the ratio of the duration of the first symbol to the duration of the first signal is 1 / 12, 1 / 16, or 1 / 20. The duration of the first symbol, 5.55 μs, 4.16 μs, or 3.33 μs, is associated with a bandwidth of 2 RB of the first signal. In other words, if the bandwidth of the first signal is 1 RB, the duration of the first symbol is one of 66.7 μs, 33.35 μs, 16.67 μs, and 8.33 μs. If the bandwidth of the first signal is 2 RBs, the duration of the first symbol is one of 5.55 μs, 4.16 μs, and 3.33 μs.

[0077] As shown in FIG. 5, the duration of the first symbol is 8.33 μs, the bandwidth of the first signal is 1 RB, 2 RB, or 3 RB, and the target BLER (block error rate) is 10 -2 Therefore, when the duration of the first symbol is 8.33 μs, the transmission requirements can be met if the bandwidth of the first signal is 1 RB or more.

[0078] As shown in FIG. 6, the duration of the first symbol is 5.55 μs, the bandwidth of the first signal is 1 RB, 2 RB, or 3 RB, and the target BLER is 10 -2 In this case, it is clear that the SNR value corresponding to a bandwidth of 1 RB is greater than the SNR values ​​corresponding to 2 RBs and 3 RBs, respectively. A smaller SNR indicates a longer distance between the terminal device and the first network device. Therefore, it is clear that the transmission performance when the bandwidth of the first signal is 2 RBs or 3 RBs is better than the transmission performance when the bandwidth of the first signal is 1 RB. On the premise of ensuring performance, the requirement can only be met when the bandwidth of the first signal is 2 RBs or more.

[0079] Similarly, as shown in FIG. 7, the duration of the first symbol is 4.16 μs, the bandwidth of the first signal is 1 RB, 2 RB, or 3 RB, and the target BLER is 10 -2 If the first symbol duration is 4.16 μs, the transmission performance when the first signal bandwidth is 2 RBs or 3 RBs is clearly better than when the first signal bandwidth is 1 RB. Even if the first signal bandwidth is 1 RB, it cannot support effective transmission of the first signal. Therefore, when the first symbol duration is 4.16 μs, the requirement can only be met when the first signal bandwidth is 2 RBs or more.

[0080] If the duration of the first symbol is 8.33 μs, setting the bandwidth of the first signal to greater than 1 RB does not improve the transmission performance of the first signal. Therefore, to optimize network resource overhead, the duration of the first symbol 8.33 μs is associated with the bandwidth of the first signal 1 RB, and there is no need to associate the duration of the first symbol 8.33 μs with a larger bandwidth. Similarly, if the duration of the first symbol is 5.55 μs, setting the bandwidth of the first signal to greater than 2 RBs does not improve the transmission performance of the first signal. Therefore, to optimize network resource overhead, the duration of the first symbol 5.55 μs can be associated with the bandwidth of the first signal 2 RBs, and there is no need to associate the duration of 5.55 μs with a larger bandwidth. The association relationships between the other durations of the first symbol and the bandwidths of the first signal in Table 1 are similar. Details will not be described here.

[0081] [Table 1]

[0082] In another possible implementation, one duration of the first symbol may alternatively be associated with multiple bandwidths of the first signal. For example, as shown in Table 2 below, a first symbol duration of 66.7 μs is associated with a first signal bandwidth of 1 RB or more; a first symbol duration of 33.35 μs is associated with a first signal bandwidth of 1 RB or more; a first symbol duration of 16.67 μs is associated with a first signal bandwidth of 1 RB or more; a first symbol duration of 8.33 μs is associated with a first signal bandwidth of 1 RB or more; a first symbol duration of 5.55 μs is associated with a first signal bandwidth of 2 RBs or more; a first symbol duration of 4.16 μs is associated with a first signal bandwidth of 2 RBs or more; and a first symbol duration of 3.33 μs is associated with a first signal bandwidth of 2 RBs or more. When the bandwidth of the first signal is 1 RB, the duration of the first symbol is one of 66.7 μs, 33.35 μs, 16.67 μs, and 8.33 μs. When the bandwidth of the first signal is 2 RBs, the duration of the first symbol is one of 66.7 μs, 33.35 μs, 16.67 μs, 8.33 μs, 5.55 μs, 4.16 μs, and 3.33 μs.

[0083] [Table 2]

[0084] Tables 3 and 4 below are examples of the associated relationship between the bandwidth of the first signal and the ratio of the duration of the first symbol to the duration of the first signal.

[0085] [Table 3]

[0086] [Table 4]

[0087] In a possible implementation, the duration of at least one first symbol associated with the bandwidth of the first signal is predefined, or the duration of at least one first symbol associated with the bandwidth of the first signal is configured by the first network device using configuration information, where the configuration information is carried in radio resource control (RRC) signaling or medium access control (MAC) signaling. In other words, the association relationship between the bandwidth of the first signal and the duration of the first symbol may be predefined, or may be configured by the first network device using the configuration information. Predefining the association relationship between the bandwidth of the first signal and the duration of the first symbol helps to reduce network resource overhead. The first network device configures the association relationship between the bandwidth of the first signal and the duration of the first symbol. This helps to flexibly update the association relationship between the bandwidth of the first signal and the duration of the first symbol.

[0088] Optionally, the RRC signaling may be RRC release signaling, RRC re-establishment signaling, RRC resume signaling, etc. Alternatively, the RRC signaling may be one of select signaling, query signaling, query repeat signaling, or query adjust signaling in passive IoT.

[0089] 402: The terminal device receives a first signal transmitted by a first network device based on a bandwidth of the first signal.

[0090] In this embodiment of the present application, before receiving the first signal transmitted by the first network device, the terminal device needs to further determine the bandwidth of the first signal based on the bandwidth of the first signal. After determining the bandwidth of the first signal, the terminal device receives the first signal transmitted by the first network device based on the bandwidth of the first signal.

[0091] 403: The terminal device determines the duration of the first symbol.

[0092] The duration of the first symbol determined by the terminal device is one of at least one first symbol duration associated with the bandwidth of the first signal. For example, assume that the relationship between the bandwidth of the first signal and the duration of the first symbol is as shown in Table 1 above. If the bandwidth of the first signal is 1 RB, the duration of the first symbol determined by the terminal device is one of 66.7 μs, 33.35 μs, 16.67 μs, and 8.33 μs. If the bandwidth of the first signal is 2 RBs, the duration of the first symbol determined by the terminal device is one of 5.55 μs, 4.16 μs, and 3.33 μs.

[0093] In this embodiment of the present application, the terminal device can first determine the bandwidth of the first signal and then determine the duration of the first symbol. Alternatively, the terminal device can simultaneously determine the duration of the first symbol and the bandwidth of the first signal.

[0094] In a possible implementation, the first network device may transmit a second signal to the terminal device, where the second signal indicates one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal. After receiving the second signal, the terminal device determines the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal based on the second signal. For a specific description of a possible implementation, please refer to the description of the embodiment corresponding to Figure 8. Details will not be described here.

[0095] In another possible implementation, the first network device may alternatively not transmit the second signal to the terminal device, and the terminal device may determine one of the bandwidth of the first signal and the duration of the at least one first symbol associated with the bandwidth of the first signal based on a preset rule.

[0096] 404: The terminal device determines information bits carried in the N first symbols based on the duration of the first symbols.

[0097] In this embodiment of the present application, after determining the duration of the first symbol, the terminal device determines the information bits carried by the N first symbols based on the duration of the first symbol. For example, if the duration of the first symbol determined by the terminal device is 5.55 μs, the terminal device determines the information bits carried by the N first symbols based on the duration of the first symbol of 5.55 μs. Optionally, the terminal device can obtain the signal energy or average signal energy within the duration of the first symbol based on the duration of the first symbol, and compare the signal energy or average signal energy with a demodulation or detection threshold set by the terminal device. If the signal energy or average signal energy is greater than the demodulation or detection threshold, the terminal device determines that the information bit carried by the first symbol is 1. If the signal energy or average signal energy is less than the demodulation or detection threshold, the terminal device determines that the information bit carried by the first symbol is 0.

[0098] In the method described in Figure 4, it can be seen that there is a relationship between the bandwidth of the first signal and the duration of the first symbol (the modulation method is ASK modulation or OOK modulation). Based on the relationship, the first signal can be transmitted by using a small bandwidth when information transmission efficiency and information transmission performance are ensured, thereby improving network frequency domain resource utilization.

[0099] FIG. 8 is a schematic flowchart of an information transmission method according to an embodiment of the present application. As shown in FIG. 8, the information transmission method includes the following steps 801 to 805. The method shown in FIG. 8 may be performed by a terminal device and a first network device (access network device), or may be performed by a chip in the terminal device and a chip in the first network device. In FIG. 8, an example in which the method is performed by the terminal device and the first network device is used for explanation. Furthermore, the processing performed by a single executing entity shown in FIG. 8 may be performed by multiple executing entities through division, and these executing entities are logically and / or physically separated. For example, the processing performed by the access network device may be performed by at least one of a central unit (CU), a distributed unit (DU), and a radio unit (RU) through division.

[0100] 801: A first network device transmits a second signal to a terminal device, the second signal indicating one of a bandwidth of the first signal and / or a duration of at least one first symbol associated with the bandwidth of the first signal, and in response, the terminal device can receive the second signal.

[0101] In this embodiment of the application, the first network device may transmit a second signal to the terminal device before transmitting a first signal to the terminal device to inform the terminal device of one of the bandwidth of the subsequently transmitted first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal.

[0102] Optionally, if the second signal indicates the bandwidth of the first signal, after receiving the second signal, the terminal device determines the bandwidth of the first signal based on the second signal, and then determines one of the durations of the at least one first symbol associated with the bandwidth of the first signal based on the bandwidth of the first signal.

[0103] For example, assume that the relationship between the bandwidth of the first signal and the duration of the first symbol is as shown in Table 5. If the second signal indicates that the bandwidth of the first signal is 1 RB, the terminal device determines that the duration of the first symbol is 8.33 μs based on the bandwidth of the first signal. The terminal device receives the first signal based on the bandwidth of the first signal, 1 RB, and determines the information bits carried by the N first symbols in the first signal based on the duration of the first symbol, 8.33 μs.

[0104] [Table 5]

[0105] Optionally, if the second signal indicates the duration of one of the first symbols, after receiving the second signal, the terminal device determines the duration of the first symbol based on the second signal, and then determines the bandwidth of the first signal associated with the duration of the first symbol based on the duration of the first symbol.

[0106] For example, assume that the relationship between the bandwidth of the first signal and the duration of the first symbol is as shown in Table 1 above. If the second signal indicates that the duration of the first symbol is 5.55 μs, the terminal device determines that the bandwidth of the first signal is 2 RBs based on the duration of the first symbol. Subsequently, the terminal device receives the first signal based on the bandwidth of the first signal, 2 RBs, and determines the information bits carried by the N first symbols in the first signal based on the duration of the first symbol, 5.55 μs.

[0107] Optionally, if the second signal indicates one of the bandwidth of the first signal and the duration of at least one first symbol associated with the bandwidth of the first signal, the terminal device determines one of the bandwidth of the first signal and the duration of the at least one first symbol associated with the bandwidth of the first signal based on the second signal after receiving the second signal.

[0108] For example, assume that the relationship between the bandwidth of the first signal and the duration of the first symbol is as shown in Table 1 above. If the second signal indicates that the bandwidth of the first signal is 2 RBs, the duration of the first symbol is 5.55 μs. The terminal device receives the first signal based on the bandwidth of the first signal (2 RBs) and determines the information bits carried by the N first symbols in the first signal based on the duration of the first symbol (5.55 μs).

[0109] In a possible implementation, the second signal further indicates a first field, which includes one or more of the following: a coding multiple of a line code of the first signal, a channel coding code rate of the first signal, or a bit repetition count of the first signal. Correspondingly, a specific implementation in which the terminal device determines information bits carried by N first symbols based on the duration of the first symbols is as follows: That is, the terminal device determines information bits carried by N first symbols based on the duration of the first symbols and the first field. In this possible implementation, line code coding, repetition coding, and / or channel coding are introduced to further improve information transmission performance. In addition, based on this possible implementation, the network device may indicate the coding multiple of a line code of the first signal, the channel coding code rate of the first signal, or the bit repetition count of the first signal. The coding multiple of a line code of the first signal, the channel coding code rate of the first signal, or the bit repetition count of the first signal may be adjusted rather than fixed. This allows for greater flexibility in information transmission.

[0110] Optionally, the coding multiple of the line code of the first signal may be one of 2, 4, and 8, the channel coding code rate of the first signal may be one of 1 / 2, 1 / 4, and 1 / 8, the channel coding may be one of a polar code or a convolutional code, and the number of bit repetitions of the first signal may be one of 1, 4, 8, 16, and 64.

[0111] For example, if the bandwidth of the first signal is 2 RBs and the duration of the first symbol is 8.33 μs, the coding multiple of the line code of the first signal included in the first field is 2. The coding multiple of the line code may be the coding coefficient of the line code, specifically referring to the number of bits after line code coding is performed for one information bit. Alternatively, if the bandwidth of the first signal is 2 RBs and the duration of the first symbol is 4.16 μs, the coding multiple of the line code of the first signal included in the first field is 4. Alternatively, if the bandwidth of the first signal is 2 RBs and the duration of the first symbol is 4.16 μs, the coding multiple of the line code of the first signal included in the first field is 2, and the channel coding code rate of the first signal is 1 / 2.

[0112] In the three combined modes, the information transmission rate is the same. However, as shown in Figure 9, when the target BLER is 10 -2 , it is clear that the SNR values ​​corresponding to the three combination modes are different. The information transmission performance of the third combination mode is greater than that of the second combination mode, which is greater than that of the first combination mode. The network device can appropriately select a combination mode based on the terminal device's requirement for information transmission performance, and indicate the combination mode to the terminal device.

[0113] In another possible implementation, the coding multiple of the line code of the first signal, the channel coding code rate of the first signal, and / or the number of bit repetitions of the first signal may alternatively be predefined. In this way, the first network device does not need to indicate the first field to the terminal device. In this way, signaling overhead is reduced.

[0114] Two specific implementations of the second signal are described below.

[0115] Aspect 1: The second signal may be further used by the terminal device to perform time and frequency synchronization. That is, the second signal may be a synchronization signal. By using the synchronization signal, the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal can be more flexibly and dynamically adjusted, thereby improving the flexibility of data signal transmission.

[0116] If the second signal is a signal used by the terminal device to perform time and frequency synchronization, the second signal may indicate one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal in the following two ways:

[0117] (1) The second signal includes M identical third signals in the time domain, where the value of M indicates one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal, and M is a positive integer. In this way, the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal can be accurately indicated.

[0118] For example, the second signal may indicate one of the bandwidth of the first signal and the duration of at least one first symbol associated with the bandwidth of the first signal. Assume that the relationship between the bandwidth of the first signal and the duration of the first symbol is as shown in Table 1 above. If the second signal includes one-third of the signal in the time domain, the second signal may indicate that the bandwidth of the first signal is 1 RB and that the duration of the first symbol is 66.7 μs. If the second signal includes two third signals in the time domain, the second signal may indicate that the bandwidth of the first signal is 1 RB and that the duration of the first symbol is 33.35 μs. If the second signal includes three third signals in the time domain, the second signal may indicate that the bandwidth of the first signal is 1 RB and that the duration of the first symbol is 16.67 μs. If the second signal includes four third signals in the time domain, the second signal indicates that the bandwidth of the first signal is 1 RB and the duration of the first symbol is 8.33 μs. If the second signal includes five third signals in the time domain, the second signal indicates that the bandwidth of the first signal is 2 RBs and the duration of the first symbol is 5.55 μs. If the second signal includes six third signals in the time domain, the second signal indicates that the bandwidth of the first signal is 2 RBs and the duration of the first symbol is 4.16 μs. If the second signal includes seven third signals in the time domain, the second signal indicates that the bandwidth of the first signal is 2 RBs and the duration of the first symbol is 3.33 μs. When detecting the second signal, the terminal device performs correlation detection using the third signal [S] and determines the amount of third signals included in the second signal based on the occurrence of correlation peaks.

[0119] (2) The second signal includes M identical third signals, and time-domain masks on the M third signals indicate one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal, where M is a positive integer. In this way, through the time-domain mask indication information superimposed on multiple concatenated identical synchronization signals, it is possible to maximize the flexibility of dynamically adjusting data signal transmission when ensuring the time-frequency synchronization performance of the terminal device.

[0120] For example, the second signal indicates one of the bandwidth of the first signal and the duration of at least one first symbol associated with the bandwidth of the first signal. The third signal is [S], and the negation of the third signal is

number

number

number

number

number

number

number

number

[0121] In a possible implementation, the second signal includes Q second symbols, the modulation scheme of the second symbols is ASK modulation or OOK modulation, Q is a positive integer, the second signal is an OFDM signal, and there is a correlation between the bandwidth of the second signal and the duration of one second symbol. The terminal device may further determine information bits carried by the Q second symbols based on the duration of the second symbol associated with the bandwidth of the second signal.

[0122] In this possible implementation, the second signal is a signal used by the terminal device to perform time and frequency synchronization. There is also a correlation between the bandwidth of the second signal and the duration of the second symbol, so that the second signal can be transmitted using a small bandwidth while ensuring information transmission efficiency and information transmission performance, thereby improving network frequency domain resource utilization.

[0123] In a possible implementation, the bandwidth of the second signal and the duration of the second symbol associated with the bandwidth of the second signal are predefined. In other words, the bandwidth of the second signal and the duration of the second symbol may be fixed. For example, as shown in FIG. 10, the bandwidth of the second signal is fixed to 1 RB, and the duration of the second symbol is fixed to, for example, 5.55 μs.

[0124] Aspect 2: The second signal is further used to carry RRC signaling or MAC signaling sent by the first network device. The transmission of the data signal is quasi-statically adjusted. For terminal devices with low mobility, the signaling overhead can be reduced and the transmission of the data signal can be maintained for a certain period of time.

[0125] Optionally, the RRC signaling may be RRC release signaling, RRC re-establishment signaling, or RRC resumption signaling, or may be RRC signaling sent by the first network device in an RRC connected mode, etc. Alternatively, the RRC signaling may be one of select signaling, query signaling, query repeat signaling, or query adjust signaling in a passive IoT.

[0126] Optionally, when the second signal is further used to carry RRC signaling or MAC signaling transmitted by the first network device, the bandwidth of the subsequently transmitted signal used by the terminal device to perform time-frequency synchronization and the duration of the ASK / OOK modulation symbol in the signal used by the terminal device to perform time-frequency synchronization remain unchanged. The second signal only affects the bandwidth of the subsequent first signal and the duration of the first symbol in the first signal, for example, as shown in FIG. 11 . In this way, if the bandwidth of the first signal and the duration of the first symbol in the first signal need to be adjusted later, the terminal device can be dynamically notified of the bandwidth of the first signal and the duration of the first symbol in the first signal using the signal used by the terminal device to perform time-frequency synchronization. Therefore, based on this optional aspect, the bandwidth of the first signal and the duration of the first symbol in the first signal can be flexibly adjusted.

[0127] Optionally, when the second signal is further used to carry RRC signaling or MAC signaling transmitted by the first network device, the bandwidth of the subsequently transmitted synchronization signal and the duration of the ASK / OOK modulation symbol in the synchronization signal are affected by the second signal, and the second signal affects the reception of the subsequently transmitted synchronization signal and the first signal. That is, the bandwidth of the subsequently transmitted signal used by the terminal device to perform time and frequency synchronization is the same as the bandwidth of the first signal. The duration of the ASK / OOK modulation symbol in the signal used by the terminal device to perform time and frequency synchronization is the same as the duration of the first symbol in the first signal, for example, as shown in FIG. 12 .

[0128] 802: A first network device transmits a first signal to a terminal device, the first signal including N first symbols, the modulation scheme of the first symbols being ASK modulation or OOK modulation, N being a positive integer, the first signal being an OFDM signal, and the duration of the first symbols being one of at least one first symbol duration associated with the bandwidth of the first signal.

[0129] 803: The terminal device receives a first signal transmitted by a first network device based on a bandwidth of the first signal.

[0130] 804: The terminal device determines the duration of the first symbol.

[0131] 805: The terminal device determines information bits carried in the N first symbols based on the duration of the first symbols.

[0132] For specific implementation forms of Steps 802 to 805, please refer to the above specific implementation forms of Steps 401 to 404, and details will not be described here.

[0133] 8, it can be seen that the network device can flexibly indicate to the terminal device one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal. In this way, there may be multiple adjustable types of information transmission rates, and information transmission is more flexible.

[0134] FIG. 13 is a schematic flowchart of an information transmission method according to an embodiment of the present application. As shown in FIG. 13, the information transmission method includes the following steps 1301 to 1306. The method shown in FIG. 13 may be performed by a terminal device, a first network device (access network device), and a second network device (core network device), or may be performed by a chip in the terminal device, a chip in the first network device, and a chip in the second network device. In FIG. 13, an example in which the method is performed by the terminal device and the first network device is used for explanation. Furthermore, the processing performed by a single executing entity shown in FIG. 13 may be performed separately by multiple executing entities, and these executing entities are logically and / or physically separated. For example, the processing performed by the access network device may be performed by at least one of a central unit (CU), a distributed unit (DU), and a radio unit (RU) through division.

[0135] 1301: A second network device transmits a fourth signal to a first network device, the fourth signal indicating one of a bandwidth of the first signal and / or a duration of at least one first symbol associated with the bandwidth of the first signal. In response, the first network device can receive the fourth signal.

[0136] 1302: The first network device transmits a second signal to a terminal device, where the second signal indicates one of a bandwidth of the first signal and / or a duration of at least one first symbol associated with the bandwidth of the first signal, and in response, the terminal device can receive the second signal.

[0137] In this embodiment of the present application, after receiving the fourth signal, the first network device transmits a second signal to the terminal device based on the fourth signal. For example, if the fourth signal indicates that the bandwidth of the first signal is 2 RBs and the duration of the first symbol is 5.55 μs, the second signal indicates that the bandwidth of the first signal is 2 RBs and the duration of the first symbol is 5.55 μs.

[0138] In other words, the bandwidth of the first signal and / or the duration of the first symbol associated with the bandwidth of the first signal indicated to the terminal device by the first network device is indicated to the first network device by the second network device.

[0139] Optionally, the fourth signal is further used to carry RRC signaling or MAC signaling. Optionally, the RRC signaling may be RRC release signaling, RRC re-establishment signaling, RRC resumption signaling, etc.

[0140] For a related description of the second signal, please refer to the description of the embodiment corresponding to Figure 8. Details will not be described here.

[0141] 1303: The first network device transmits a first signal to the terminal device, the first signal including N first symbols, the modulation scheme of the first symbols being ASK modulation or OOK modulation, N being a positive integer, the first signal being an OFDM signal, and the duration of the first symbols being one of at least one first symbol duration associated with the bandwidth of the first signal.

[0142] 1304: The terminal device receives a first signal transmitted by the first network device based on a bandwidth of the first signal.

[0143] 1305: The terminal device determines the duration of the first symbol.

[0144] 1306: The terminal device determines, based on the duration of the first symbols, information bits carried in the N first symbols.

[0145] For specific implementation forms of Steps 1302 to 1306, please refer to the above specific implementation forms of Steps 801 to 805, and details will not be described here.

[0146] FIG. 14 is a schematic flowchart of an information transmission method according to an embodiment of the present application. As shown in FIG. 14, the information transmission method includes the following steps 1401 to 1408. The method shown in FIG. 14 may be performed by a terminal device, a first network device (access network device), and a second network device (core network device), or may be performed by a chip in the terminal device, a chip in the first network device, and a chip in the second network device. FIG. 14 illustrates an example in which the method is performed by a terminal device, a first network device, and a second network device. Furthermore, the processing performed by a single executing entity shown in FIG. 14 may be performed by multiple executing entities, which are logically and / or physically separated. For example, the processing performed by the access network device may be performed by at least one of a central unit (CU), a distributed unit (DU), and a radio unit (RU) through division.

[0147] 1401: The terminal device transmits a third signal to the first network device, the third signal indicating one or more of the following information: a signal coverage level of the terminal device, a measured reference signal received power RSRP, a transmission rate requested by the terminal device, or information indicating whether the terminal device supports channel coding. In response, the first network device can receive the third signal.

[0148] Optionally, the third signal may further indicate a range of transmission rates supported by the terminal device.

[0149] 1402: The first network device transmits a third signal to the second network device, and in response, the second network device can receive the third signal.

[0150] 1403: The second network device transmits a fourth signal to the first network device, where the fourth signal indicates one of a bandwidth of the first signal and / or a duration of at least one first symbol associated with the bandwidth of the first signal. In response, the first network device can receive the fourth signal.

[0151] In this embodiment of the present application, after receiving the third signal, the second network device can determine one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal based on the third signal. Then, the second network device transmits a fourth signal to the first network device, where the fourth signal indicates one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal.

[0152] After steps 1401 and 1402 are performed, the network device can select the optimal duration of the first symbol of the terminal device for transmission based on the actual coverage level, actual channel decoding capability, etc. when the coverage requirement is met, thereby ensuring a high information transmission rate.

[0153] 1404: The first network device transmits a second signal to the terminal device, where the second signal indicates one of a bandwidth of the first signal and / or a duration of at least one first symbol associated with the bandwidth of the first signal. In response, the terminal device can receive the second signal.

[0154] 1405: The first network device transmits a first signal to the terminal device, the first signal including N first symbols, the modulation scheme of the first symbols being ASK modulation or OOK modulation, N being a positive integer, the first signal being an OFDM signal, and the duration of the first symbols being one of at least one first symbol duration associated with the bandwidth of the first signal.

[0155] 1406: The terminal device receives a first signal transmitted by the first network device based on a bandwidth of the first signal.

[0156] 1407: The terminal device determines the duration of the first symbol.

[0157] 1408: The terminal device determines information bits carried in the N first symbols based on the duration of the first symbols.

[0158] For specific implementation forms of Steps 1403 to 1408, please refer to the above specific implementation forms of Steps 1301 to 1306, and details will not be described here.

[0159] FIG. 15 is a diagram of the structure of a communication device according to one embodiment of this application. The communication device shown in FIG. 15 may be configured to perform some or all of the functions of the terminal device in the method embodiments described in FIG. 4, FIG. 8, FIG. 13, or FIG. 14. The device may be a terminal device, a device within a terminal device, or a device usable with a terminal device. Alternatively, the communication device may be a chip system. The communication device shown in FIG. 15 may include a communication unit 1501 and a processing unit 1502. The processing unit 1502 is configured to process data. The communication unit 1501 incorporates a receiving unit and a transmitting unit. The communication unit 1501 may also be referred to as a transceiver unit. Alternatively, the communication unit 1501 may be divided into a receiving unit and a transmitting unit.

[0160] The communication unit 1501 is configured to receive a first signal transmitted by a first network device based on a bandwidth of the first signal, the first signal including N first symbols, the modulation scheme of the first symbols being amplitude shift keying (ASK) modulation or on-off keying (OOK) modulation, N being a positive integer, and the first signal being an orthogonal frequency division multiplexing (OFDM) signal.

[0161] The processing unit 1502 is configured to determine a duration of a first symbol, the duration of the first symbol being one of at least one first symbol duration associated with a bandwidth of the first signal.

[0162] The processing unit 1502 is further configured to determine information bits carried in the N first symbols based on the duration of the first symbols.

[0163] In a possible implementation, the duration of the at least one first symbol associated with the bandwidth of the first signal is predefined, or the duration of the at least one first symbol associated with the bandwidth of the first signal is configured by the first network device by using configuration information, and the configuration information is carried in radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0164] In a possible implementation, the communication unit 1501 is further configured to receive a second signal, the second signal indicating one of a bandwidth of the first signal and / or a duration of at least one first symbol associated with the bandwidth of the first signal.

[0165] In a possible implementation, the second signal further indicates a first field, and the first field includes one or more of the following: a coding multiple of a line code of the first signal, a channel coding code rate of the first signal, or a bit repetition number of the first signal. The processing unit 1502 determines the information bits carried in the N first symbols based on the duration of the first symbols, specifically, determines the information bits carried in the N first symbols based on the duration of the first symbols and the first field.

[0166] In a possible implementation, the second signal is further used by the terminal device to perform time and frequency synchronization.

[0167] In a possible implementation, the second signal includes M identical third signals in the time domain, where the value of M indicates one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal, and M is a positive integer.

[0168] In a possible implementation, the second signal includes M identical third signals, and a time-domain mask on the M third signals indicates one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal, where M is a positive integer.

[0169] In a possible implementation, the second signal includes Q second symbols, the modulation scheme of the second symbols is ASK modulation or OOK modulation, Q is a positive integer, the second signal is an OFDM signal, and there is a correlation between the bandwidth of the second signal and the duration of one second symbol. The processing unit 1502 is further configured to determine the information bits carried in the Q second symbols based on the duration of the second symbol associated with the bandwidth of the second signal.

[0170] In a possible implementation, the bandwidth of the second signal and the duration of the second symbol associated with the bandwidth of the second signal are predefined.

[0171] In a possible implementation, the second signal is further used to carry RRC signaling or MAC signaling transmitted by the first network device.

[0172] FIG. 15 is a diagram of the structure of a communication device according to one embodiment of the present application. The communication device shown in FIG. 15 may be configured to perform some or all of the functions of the first network device in the method embodiments described in FIG. 4, FIG. 8, FIG. 13, or FIG. 14. The device may be the first network device, a device within the first network device, or a device that can be used to match the first network device. Alternatively, the communication device may be a chip system. The communication device shown in FIG. 15 may include a communication unit 1501 and a processing unit 1502. The processing unit 1502 is configured to process data. The communication unit 1501 incorporates a receiving unit and a transmitting unit. The communication unit 1501 may also be referred to as a transceiver unit. Alternatively, the communication unit 1501 may be divided into a receiving unit and a transmitting unit.

[0173] The communication unit 1501 is configured to transmit a first signal to a terminal device, the first signal including N first symbols, a modulation scheme of the first symbols being amplitude shift keying (ASK) modulation or on-off keying (OOK) modulation, N being a positive integer, the first signal being an orthogonal frequency division multiplexing (OFDM) signal, and a duration of the first symbols being one of at least one first symbol duration associated with a bandwidth of the first signal.

[0174] In a possible implementation, the duration of the at least one first symbol associated with the bandwidth of the first signal is predefined, or the duration of the at least one first symbol associated with the bandwidth of the first signal is configured by the first network device by using configuration information, and the configuration information is carried in radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0175] In a possible implementation, the communication unit 1501 is further configured to transmit a second signal to the terminal device, the second signal indicating one of a bandwidth of the first signal and / or a duration of at least one first symbol associated with the bandwidth of the first signal.

[0176] In a possible implementation, the second signal further indicates a first field, which includes one or more of the following: a coding multiple of the line code of the first signal, a channel coding code rate of the first signal, or a bit repetition number of the first signal.

[0177] In a possible implementation, the second signal is further used by the terminal device to perform time and frequency synchronization.

[0178] In a possible implementation, the second signal includes M identical third signals in the time domain, where the value of M indicates one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal, and M is a positive integer.

[0179] In a possible implementation, the second signal includes M identical third signals, and a time-domain mask on the M third signals indicates one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal, where M is a positive integer.

[0180] In a possible implementation, the second signal includes Q second symbols, the modulation scheme of the second symbols is ASK modulation or OOK modulation, Q is a positive integer, the second signal is an OFDM signal, and there is a correlation between the bandwidth of the second signal and the duration of one second symbol.

[0181] In a possible implementation, the bandwidth of the second signal and the duration of the second symbol associated with the bandwidth of the second signal are predefined.

[0182] In a possible implementation, the second signal carries RRC signaling or MAC signaling transmitted by the first network device.

[0183] In a possible implementation, the communication unit 1501 is further configured to receive a fourth signal transmitted by the second network device before transmitting the second signal to the terminal device, wherein the fourth signal indicates one of the bandwidth of the first signal and / or the duration of at least one first symbol associated with the bandwidth of the first signal.

[0184] In a possible implementation, the communication unit 1501 is further configured to receive a third signal transmitted by the terminal device before receiving the fourth signal transmitted by the second network device, the third signal indicating one or more of the following information: a signal coverage level of the terminal device, a measured reference signal received power RSRP, a transmission rate requested by the terminal device, or information indicating whether the terminal device supports channel coding, and to transmit the third signal to the second network device.

[0185] 16 is a diagram of a configuration of a communication device. The communication device 1600 may be a terminal device in the aforementioned method embodiment, may be a first network device in the aforementioned method embodiment, may be a chip, chip system, processor, etc. that supports the terminal device in performing the aforementioned method, or may be a chip, chip system, processor, etc. that supports the first network device in performing the aforementioned method. The communication device may be configured to perform the method described in the aforementioned method embodiment. For details, please refer to the description of the aforementioned method embodiment.

[0186] The communication device 1600 may include one or more processors 1601. The processor 1601 may be a general-purpose processor or a special-purpose processor, etc. For example, the processor 1601 may be a baseband processor or a central processing unit. The baseband processor may be configured to process communication protocols and communication data. The central processing unit may be configured to control a communication device (e.g., a base station, a baseband chip, a terminal, a terminal chip, a DU, or a CU), execute software programs, and process data of the software programs.

[0187] Optionally, the communication device 1600 may include one or more memories 1602. The memory 1602 may store instructions 1604, which may be executed on the processor 1601 to enable the communication device 1600 to perform the methods described in the preceding method embodiments. Optionally, the memory 1602 may further store data. The processor 1601 and the memory 1602 may be located separately or integrated with each other.

[0188] Optionally, the communication device 1600 may further include a transceiver 1605 and an antenna 1606. The transceiver 1605 may be referred to as a transceiver unit, transceiver machine, transceiver circuit, etc., and is configured to perform transceiver functions. The transceiver 1605 may include a receiver and a transmitter. The receiver may be referred to as a receiving machine, receiver circuit, etc., and is configured to perform receiving functions. The transmitter may be referred to as a transmitting machine, transmitter circuit, etc., and is configured to perform transmitting functions. The processing unit 1502 shown in FIG. 15 may be a processor 1601. The communication unit 1501 may be the transceiver 1605.

[0189] The communication apparatus 1600 is a terminal device, and the processor 1601 is configured to perform the data processing operations of the terminal device in the aforementioned method embodiments. The transceiver 1605 is configured to perform the data transmission and reception operations of the terminal device in the aforementioned method embodiments. For example, the transceiver 1605 may be configured to perform the data transmission and reception operations of the terminal device in FIG. 4, FIG. 8, FIG. 13, or FIG. 14. The processor 1601 may be configured to perform the data processing operations of the terminal device in FIG. 4, FIG. 8, FIG. 13, or FIG. 14.

[0190] The communications apparatus 1600 is a first network device, and the processor 1601 is configured to perform the data processing operations of the first network device in the aforementioned method embodiments. The transceiver 1605 is configured to perform the data transmission and reception operations of the first network device in the aforementioned method embodiments. For example, the transceiver 1605 may be configured to perform the data transmission and reception operations of the first network device in Figure 4, Figure 8, Figure 13, or Figure 14. The processor 1601 may be configured to perform the data processing operations of the first network device in Figure 4, Figure 8, Figure 13, or Figure 14.

[0191] In another possible design, the processor 1601 may include a transceiver configured to perform reception and transmission functions. For example, the transceiver may be a transceiver circuit, an interface, or an interface circuit. The transceiver circuit, the interface, or the interface circuit configured to perform reception and transmission functions may be separate or integrated with each other. The transceiver circuit, the interface, or the interface circuit may be configured to read and write code / data. Alternatively, the transceiver circuit, the interface, or the interface circuit may be configured to transmit or forward signals.

[0192] In yet another possible design, optionally, the processor 1601 may store instructions 1603, which are executed on the processor 1601, such that the communication device 1600 can perform the methods described in the preceding method embodiments. The instructions 1603 may be fixed within the processor 1601, in which case the processor 1601 may be implemented by hardware.

[0193] In yet another possible design, the communication device 1600 may include circuitry. The circuitry may perform the transmitting, receiving, or communication functions in the aforementioned method embodiments. The processors and transceivers described in this embodiment of the present application may be implemented in an integrated circuit (IC), an analog IC, a radio frequency integrated circuit (RFIC), a hybrid signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, or the like. The processors and transceivers may alternatively be fabricated using various IC technologies, such as complementary metal oxide semiconductor (CMOS), n-type metal oxide semiconductor (nMOS), p-type metal oxide semiconductor (PMOS), bipolar junction transistor (BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), and gallium arsenide (GaAs).

[0194] The communication device described in the above embodiment may be a first communication device or a second communication device. However, the scope of the communication device described in the embodiment of this application is not limited thereto, and the structure of the communication device may not be limited by FIG. 16. The communication device may be an independent device or a part of a larger device. For example, the communication device may be: (1) A standalone integrated circuit IC, chip, or chip system or subsystem; (2) a set having one or more ICs, optionally the IC set may alternatively include a storage component configured to store data and instructions; (3) ASIC, e.g., modem (MSM); (4) Modules that can be embedded into other devices; (5) Receivers, terminals, intelligent terminals, mobile phones, wireless devices, handheld devices, mobile units, in-vehicle devices, network devices, cloud devices, artificial intelligence devices, etc.; or (6) Other devices, etc. may be.

[0195] For cases where the communication device can be a chip or a chip system, please refer to the diagram of the structure of a chip shown in Figure 17. The chip 1700 shown in Figure 17 includes a processor 1701 and an interface 1702. Optionally, the chip 1700 may further include a memory 1703. There may be more than one processor 1701, and there may be more than one interface 1702.

[0196] In the design, when the chip is configured to perform the functions of the first terminal device in this embodiment of this application,

[0197] The interface 1702 is configured to receive or output a signal. For example, the interface 1702 may be configured to perform the signal receiving or output operation of the terminal device of FIG. 4, FIG. 8, FIG. 13, or FIG.

[0198] The processor 1701 is configured to perform data processing operations of the first communication device. For example, the processor 1701 may be configured to perform data processing operations of the terminal device of FIG. 4, FIG. 8, FIG. 13, or FIG. 14.

[0199] In another design, when a chip is configured to perform the functionality of the first network device in this embodiment of this application:

[0200] The interface 1702 is configured to receive or output a signal. For example, the interface 1702 may be configured to perform the signal receiving or output operations of the first network device of FIG. 4, FIG. 8, FIG. 13, or FIG. 14.

[0201] The processor 1701 is configured to perform data processing operations of a network device. For example, the processor 1701 may be configured to perform data processing operations of the first network device of FIG. 4, FIG. 8, FIG. 13, or FIG. 14.

[0202] It should be understood that in some scenarios, some optional features in the embodiments of this application can be implemented independently without relying on other features, for example, the solutions on which the optional features are currently based, to solve corresponding technical problems and achieve corresponding effects. Alternatively, in some scenarios, the optional features are combined with other functions based on requirements. Correspondingly, the communication devices provided in the embodiments of this application can also implement these features or functions accordingly. Details will not be described here.

[0203] It should be noted that the processor in the embodiments of this application may be an integrated circuit chip and have signal processing capabilities. In one implementation process, the steps of the above-described method embodiments may be implemented using hardware integrated logic circuitry of a processor, or may be implemented using instructions in the form of software. The processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component.

[0204] It is understood that the memory of the present embodiments of this application may be volatile, non-volatile, or may include both volatile and non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory may be random access memory (RAM) used as an external cache. Throughout the description of the examples (but without imposing any limitation), many forms of RAM may be used, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct Rambus dynamic random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein includes, but is not limited to, these and any other suitable types of memory.

[0205] This application further provides a computer-readable medium. The storage medium stores a computer program or instructions. When the computer program is executed by a communication device or when the instructions are executed by a communication device, the functions in any one of the above-mentioned method embodiments are performed.

[0206] This application further provides a computer program product comprising instructions, which, when read and executed by a computer, enable the computer to perform the functions of any one of the method embodiments described above.

[0207] All or part of the above embodiments may be implemented using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the procedures or functions according to the embodiments of this application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, optical fiber, or digital subscriber line (DSL)) or wireless (e.g., infrared, radio waves, or microwave) transmission. The computer-readable storage medium may be any available medium accessible by a computer, or may be a data storage device, such as a server or data center, incorporating one or more available media. The media that can be used may be magnetic media (e.g., floppy disks, hard disks, or magnetic tapes), optical media (e.g., high-density digital video discs (DVDs)), semiconductor media (e.g., solid state disks (SSDs)), and the like.

[0208] The above description is merely a specific implementation of this application and does not limit the scope of protection of this application. Any variations or replacements that can be easily conceived by those skilled in the art within the technical scope disclosed in this application shall fall within the scope of protection of this application. Therefore, the scope of protection of this application shall be subject to the scope of protection of the claims. [Explanation of symbols]

[0209] 30 Terminal Devices 31 Access Network Devices 32 Core Network Devices 1501 Communication Unit 1502 Processing Unit 1600 Communication Equipment 1601 processor 1602 memory 1603 Command 1604 Instruction 1605 transceiver 1606 Antenna 1700 chips 1701 processor 1702 Interface 1703 memory

Claims

1. 1. A method for transmitting information, the method comprising: receiving, by a terminal device, a first signal transmitted by a first network device based on a bandwidth of the first signal, wherein the first signal includes N first symbols, a modulation scheme of the first symbols is amplitude shift keying (ASK) modulation or on-off keying (OOK) modulation, N is a positive integer, and the first signal is an orthogonal frequency division multiplexing (OFDM) signal; determining, by the terminal device, a duration of the first symbol, wherein the duration of the first symbol is one of at least one first symbol duration associated with the bandwidth of the first signal; determining, by the terminal device, information bits carried in N first symbols based on the duration of the first symbols; A method of transmitting information, including:

2. 2. The method of claim 1, wherein the duration of the at least one first symbol associated with the bandwidth of the first signal is predefined, or the duration of the at least one first symbol associated with the bandwidth of the first signal is configured by the first network device by using configuration information, the configuration information being carried in radio resource control (RRC) signaling or medium access control (MAC) signaling.

3. The method comprises: receiving, by the terminal device, a second signal, the second signal indicating one of the bandwidth of the first signal and / or the duration of the at least one first symbol associated with the bandwidth of the first signal; 2. The method of claim 1, comprising:

4. the second signal further indicates a first field, the first field including one or more of the following: a coding multiple of a line code of the first signal, a channel coding code rate of the first signal, or a bit repetition number of the first signal; The step of determining, by the terminal device, information bits carried in the N first symbols based on the duration of the first symbols comprises: determining, by the terminal device, the information bits carried in the N first symbols based on the duration of the first symbols and the first field; 4. The method of claim 3, comprising:

5. The method of claim 3 , wherein the second signal is further used by the terminal device to perform time and frequency synchronization.

6. 4. The method of claim 3, wherein the second signal includes M identical third signals in the time domain, the value of M indicating one of the bandwidth of the first signal and / or the duration of the at least one first symbol associated with the bandwidth of the first signal, and M is a positive integer.

7. 4. The method of claim 3, wherein the second signal includes M identical third signals, and a time-domain mask on the M identical third signals indicates one of the bandwidth of the first signal and / or the duration of the at least one first symbol associated with the bandwidth of the first signal, where M is a positive integer.

8. The second signal includes Q second symbols, a modulation scheme of the second symbols is ASK modulation or OOK modulation, Q is a positive integer, the second signal is an OFDM signal, and there is a correlation between a bandwidth of the second signal and a duration of one second symbol, and the method includes: determining, by the terminal device, information bits carried in the Q second symbols based on the duration of the second symbols associated with the bandwidth of a second signal; The method of claim 3, further comprising:

9. The method of claim 8 , wherein the bandwidth of the second signal and the duration of the second symbol associated with the bandwidth of the second signal are predefined.

10. The method of claim 3 , wherein the second signal is further used to carry RRC signaling or MAC signaling transmitted by the first network device.

11. The method comprises: transmitting, by the terminal device, a third signal to the first network device, the third signal indicating one or more of the following information: a signal coverage level of the terminal device, a measured reference signal received power RSRP, a transmission rate requested by the terminal device, or information indicating whether the terminal device supports channel coding; The method of claim 3, further comprising:

12. 1. A method for transmitting information, the method comprising: transmitting, by a first network device, a first signal to a terminal device, the first signal including N first symbols, a modulation scheme of the first symbols being amplitude shift keying (ASK) modulation or on-off keying (OOK) modulation, N being a positive integer, the first signal being an orthogonal frequency division multiplexing (OFDM) signal, and a duration of the first symbols being one of at least one first symbol duration associated with a bandwidth of the first signal; A method of transmitting information, including:

13. 13. The method of claim 12, wherein the duration of the at least one first symbol associated with the bandwidth of the first signal is predefined or the duration of the at least one first symbol associated with the bandwidth of the first signal is configured by the first network device by using configuration information, the configuration information being carried in radio resource control (RRC) signaling or medium access control (MAC) signaling.

14. The method comprises: transmitting, by the first network device, a second signal to the terminal device, the second signal indicating one of the bandwidth of the first signal and / or the duration of the at least one first symbol associated with the bandwidth of the first signal; 13. The method of claim 12, comprising:

15. 15. The method of claim 14, wherein the second signal further indicates a first field, the first field including one or more of the following: a coding multiple of a line code of the first signal, a channel coding code rate of the first signal, or a bit repetition number of the first signal.

16. The method of claim 14 , wherein the second signal is further used by the terminal device to perform time and frequency synchronization.

17. 15. The method of claim 14, wherein the second signal includes M identical third signals in the time domain, a value of M indicating one of the bandwidth of the first signal and / or the duration of the at least one first symbol associated with the bandwidth of the first signal, and M is a positive integer.

18. 15. The method of claim 14, wherein the second signal includes M identical third signals, and a time-domain mask on the M identical third signals indicates one of the bandwidth of the first signal and / or the duration of the at least one first symbol associated with the bandwidth of the first signal, where M is a positive integer.

19. 17. The method of claim 16, wherein the second signal includes Q second symbols, a modulation scheme of the second symbols is ASK modulation or OOK modulation, Q is a positive integer, the second signal is an OFDM signal, and there is a correlation between a bandwidth of the second signal and a duration of one second symbol.

20. 20. The method of claim 19, wherein the bandwidth of the second signal and the duration of the second symbol associated with the bandwidth of the second signal are predefined.

21. 15. The method of claim 14, wherein the second signal carries RRC signaling or MAC signaling transmitted by the first network device.

22. Before the step of transmitting, by the first network device, a second signal to the terminal device, the method further comprises: receiving, by the first network device, a fourth signal transmitted by a second network device, the fourth signal indicating one of the bandwidth of the first signal and / or the duration of the at least one first symbol associated with the bandwidth of the first signal; 15. The method of claim 14, further comprising:

23. Before the step of receiving, by the first network device, a fourth signal transmitted by a second network device, the method further comprises: receiving, by the first network device, a third signal transmitted by the terminal device, the third signal indicating one or more of the following information: a signal coverage level of the terminal device, a measured reference signal received power (RSRP), a transmission rate requested by the terminal device, or information indicating whether the terminal device supports channel coding; transmitting, by the first network device, the third signal to the second network device; 23. The method of claim 22, further comprising:

24. A communication device comprising a unit configured to perform the method according to any one of claims 1 to 11 or comprising a unit configured to perform the method according to any one of claims 12 to 23.

25. 24. A communications device comprising a processor and a memory, the processor coupled to the memory, the processor configured to perform a method according to any one of claims 1 to 11, or the processor configured to perform a method according to any one of claims 12 to 23.

26. a chip comprising a processor and an interface, the processor coupled to the interface; The interface is configured to receive or output signals and the processor is configured to execute code instructions, thereby performing the method of any one of claims 1 to 11 or performing the method of any one of claims 12 to 23. Tips.

27. 24. A computer-readable storage medium storing computer-executable instructions that, when invoked by a computer, enable the computer to perform the method of any one of claims 1 to 11, or that, when invoked by a computer, enable the computer to perform the method of any one of claims 12 to 23.

28. 24. A computer program comprising instructions which, when read and executed by a computer, enable the computer to perform the method of any one of claims 1 to 11, or enable the computer to perform the method of any one of claims 12 to 23.

Images