Wireless communication method and communication device

Abstract

Provided are a wireless communication method and a communication device. The method comprises: a first device performs D2R transmission with a second device on the basis of first information, wherein the first information comprises one or more of the following: information on a carrier frequency; information on a chip length; information on SFS; and information on a modulation scheme. The first device determines first information, the first information comprising one or more of the following information used for D2R transmission: information on a carrier frequency, information on a chip length, information on SFS, information on a modulation scheme, etc., thereby using the first information to implement D2R transmission with the second device.

Description

Method and communication device for wireless communication TECHNICAL FIELD

[0001] The present application relates to the field of communication technology, and more particularly, to a method and a communication device for wireless communication. BACKGROUND

[0002] Device-to-Reader (D2R) transmission between an ambient powered (AMP) device and a reader can be in a backscatter or an active transmission manner. For the active transmission manner, how the AMP device effectively performs the D2R transmission becomes a problem to be solved.

[0003] SUMMARY

[0004] The present application provides a method and a communication device for wireless communication. Each aspect of the present application is described below.

[0005] In a first aspect, a method for wireless communication is provided, comprising: performing, by a first device, a D2R transmission with a second device based on first information; wherein the first information comprises one or more of: information of a carrier frequency; information of a chip length; information of an SFS; information of a modulation manner.

[0006] In a second aspect, a method for wireless communication is provided, comprising: sending, by a second device, first information or information associated with the first information to a first device, the first information being used for a D2R transmission between the first device and the second device; wherein the first information comprises one or more of: information of a carrier frequency; information of a chip length; information of an SFS; information of a modulation manner.

[0007] In a third aspect, a communication device is provided, comprising: a transceiver configured to perform a D2R transmission with a second device based on first information; wherein the first information comprises one or more of: information of a carrier frequency; information of a chip length; information of an SFS; information of a modulation manner.

[0008] In a fourth aspect, a communication device is provided, comprising: a transceiver configured to send first information or information associated with the first information to a first device, the first information being used for a D2R transmission between the first device and the second device; wherein the first information comprises one or more of: information of a carrier frequency; information of a chip length; information of an SFS; information of a modulation manner.

[0009] In a fifth aspect, a communication device is provided, comprising a transceiver, a memory, and a processor, the memory being configured to store a program, the processor being configured to invoke the program in the memory and control the transceiver to receive or send a signal, so that the communication device performs the method according to the first aspect.

[0010] In a sixth aspect, a communication device is provided, comprising a transceiver, a memory, and a processor, the memory being configured to store a program, the processor being configured to invoke the program in the memory and control the transceiver to receive or send a signal, so that the communication device performs the method according to the second aspect.

[0011] In a seventh aspect, an apparatus is provided, comprising a processor configured to invoke a program from a memory, so that the apparatus performs the method according to any one of the first aspect or the second aspect.

[0012] In an eighth aspect, a chip is provided, comprising a processor configured to invoke a program from a memory, so that a device installed with the chip performs the method according to the first aspect or the second aspect.

[0013] In a ninth aspect, a computer readable storage medium is provided, having a program stored thereon, the program causing a computer to perform the method according to the first aspect or the second aspect.

[0014] In a tenth aspect, a computer program product is provided, comprising a program, the program causing a computer to perform the method according to the first aspect or the second aspect.

[0015] In an eleventh aspect, a computer program is provided, the computer program causing a computer to perform the method according to the first aspect or the second aspect.

[0016] In embodiments of the present application, the first device acquires first information, wherein the first information comprises one or more of information of a carrier frequency used for D2R transmission, information of a chip length, information of a small frequency shift (SFS), information of a modulation mode, etc., so as to realize D2R transmission with the second device by using the first information. BRIEF DESCRIPTION OF DRAWINGS

[0017] FIG. 1 is an example of a system architecture of a wireless communication system suitable for embodiments of the present application.

[0018] FIG. 2 is an example of a system architecture of another wireless communication system suitable for embodiments of the present application.

[0019] FIG. 3 is a structural schematic diagram of an A-IoT device suitable for embodiments of the present application.

[0020] Fig. 4 is a schematic diagram of the working principle of a radio frequency acquisition module of an A-IoT device according to an embodiment of the present application.

[0021] Fig. 5 is a schematic diagram of a load modulation based signal transmission according to an embodiment of the present application.

[0022] Fig. 6 is a schematic diagram of a load modulation mode according to an embodiment of the present application.

[0023] Fig. 7 is a schematic flow chart of scheduling a D2R transmission according to an embodiment of the present application.

[0024] Fig. 8 is a schematic diagram of the structure of a PRDCH according to an embodiment of the present application.

[0025] Fig. 9 is a schematic diagram of a carrier modulation according to an embodiment of the present application.

[0026] Fig. 10 is a schematic diagram of an SFS according to an embodiment of the present application.

[0027] Fig. 11 is a schematic flow chart of a communication method according to an embodiment of the present application.

[0028] Fig. 12 is a schematic diagram of sub-band division according to an embodiment of the present application.

[0029] Fig. 13 is a schematic diagram of the structure of an intermediate frequency receiver according to an embodiment of the present application.

[0030] Fig. 14 is a schematic diagram of the structure of a zero intermediate frequency receiver according to an embodiment of the present application.

[0031] Fig. 15 is a schematic diagram of calculating the same carrier frequency based on different first frequency offsets.

[0032] Fig. 16 is a schematic diagram of the structure of a communication device according to an embodiment of the present application.

[0033] Fig. 17 is a schematic diagram of the structure of a communication device according to an embodiment of the present application.

[0034] Fig. 18 is a schematic diagram of an apparatus for communication according to an embodiment of the present application. DETAILED DESCRIPTION

[0035] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0036] Communication system

[0037] The technical solutions of the embodiments of the present application can be applied to various communication systems. For example, a fifth generation (5G) system or new radio (NR), a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD), and the like. The technical solutions provided in the present application can also be applied to future communication systems, for example, a sixth generation mobile communication system, for example, a satellite communication system, and the like.

[0038] FIG. 1 and FIG. 2 show schematic diagrams of a communication system to which the embodiments of the present application are applicable. As shown in FIG. 1, the communication devices in the communication system 100 can include a first device 110 and a second device 120. Among them, the first device 110 and the second device 120 can communicate through a wireless network.

[0039] As an example, the communication system 100 can be a low-power Internet of Things system based on a cellular network. Among them, the first device 110 can be a terminal based on ambient Internet of Things communication, for example, an Ambient IoT (A-IoT) device (hereinafter, also referred to as a device); the second device 120 can be a reader, which can be a network device or a terminal device, for example. As shown in FIG. 2, the reader can serve as an intermediate node, which has a connection based on a Un interface between the intermediate node and a network device, and the first device 110 can communicate with the network device through the intermediate node.

[0040] In the embodiments of the present application, the communication from the first device 110 to the second device 120 can be referred to as device to reader transmission (D2R), which can be regarded as uplink transmission; correspondingly, the communication from the second device 120 to the first device 110 can be referred to as reader to device transmission (R2D), which can be regarded as downlink transmission.

[0041] In the embodiments of the present application, the terminal device can also be referred to as a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user apparatus. The terminal device in the embodiments of the present application can refer to a device providing voice and / or data connectivity for a user, and can be used to connect people, things and machines, such as handheld devices with wireless connection function, vehicle-mounted devices, etc. The terminal device in the embodiments of the present application can be a mobile phone, a tablet computer (Pad), a notebook computer, a palm computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. Optionally, the terminal device can be used to act as a base station. For example, the terminal device can act as a scheduling entity, which provides sidelink signals between terminal devices in vehicle to everything (V2X) or device to device (D2D), etc. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and the smart home device communicate with each other without relaying the communication signals through the base station.

[0042] In embodiments of the present application, the network device can be a device for communicating with a terminal device. The network device can be, for example, an access network device or a radio access network device, for example, the network device can be a base station. The base station can broadly cover various names in the following or can be replaced by the following names, for example: Node B (Node B), evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station (MeNB), auxiliary station SeNB (SeNB), multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, modem or chip for being disposed in the foregoing device or apparatus. The base station can also be a mobile switching center and a device assuming a base station function in device-to-device (D2D), vehicle-to-everything (V2X), machine-to-machine (M2M) communication, a network side device in 6G network, a device assuming a base station function in future communication system, etc. The base station can support networks of the same or different access technologies. Embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.

[0043] The base station can be fixed or mobile. For example, a helicopter or a drone can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, the helicopter or the drone can be configured to act as a device communicating with another base station.

[0044] In some deployments, the network device can refer to a CU or a DU; or the network device includes a CU and a DU. The gNB can also include an AAU.

[0045] The network device and the terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water; and can also be deployed on airplanes, balloons and satellites in the air. The scene in which the network device and the terminal device are located is not limited in the embodiments of the present application.

[0046] It should be understood that all or part of the functions of the communication device in the present application can also be implemented by software functions running on hardware, or by virtualized functions instantiated on a platform, such as a cloud platform.

[0047] A-IoT device

[0048] The so-called A-IoT device refers to an IoT device that uses various environmental energies, such as wireless radio frequency energy, light energy, solar energy, thermal energy, mechanical energy, and various environmental energies to drive itself. Such devices can have no energy storage capability, or can have very limited energy storage capability (for example, using a capacitor with a capacity of tens of uF). Compared with traditional IoT devices, A-IoT devices have many advantages such as no conventional battery, no maintenance, small size, low complexity and low cost, long service life, etc.

[0049] The environmental Internet of Things generally includes network devices and A-IoT devices. For example, as shown in FIG. 3, the network device is used to send wireless energy supply signals and downlink communication signals to the A-IoT device, and receive backscattering signals of the A-IoT device. The basic A-IoT device generally includes an energy harvesting module, a backscattering communication module, and a low-power computing module. In addition, the A-IoT device can also include a memory or a sensor, for storing basic information (such as article identification, etc.) or obtaining environmental temperature, environmental humidity, etc. sensor data.

[0050] As shown in FIG. 4, the radio frequency energy harvesting module realizes the collection of space electromagnetic wave energy based on the principle of electromagnetic induction, and then obtains the energy required to drive the A-IoT device to work, such as for driving low-power demodulation, modulation modules, sensors and memory reading, etc. Therefore, the A-IoT device does not need a traditional battery.

[0051] The A-IoT device generally uses energy harvesting and backscattering for communication. The following will be introduced in detail.

[0052] As shown in FIG. 5, the A-IoT device receives the wireless signal sent by the network, modulates the wireless signal, loads the information to be sent, and radiates the modulated signal from the antenna. This information transmission process is called backscatter communication. Backscatter and load modulation are inseparable. Load modulation adjusts and controls the circuit parameters of the oscillation loop of the A-IoT device according to the beat of the data stream, so that the size of the electronic tag impedance and other parameters change, thereby completing the modulation process. Load modulation technology mainly includes resistance load modulation and capacitance load modulation. In resistance load modulation, a resistance is connected in parallel with the load, and the resistance is controlled to be turned on or off based on the binary data stream, for example, as shown in FIG. 6. The on-off of the resistance will cause the change of the circuit voltage, so as to realize amplitude shift keying (ASK), that is, the modulation and transmission of the signal are realized by adjusting the amplitude of the backscatter signal of the A-IoT device. Similarly, in capacitance load modulation, the on-off of the capacitance can realize the change of the circuit resonance frequency, realize frequency shift keying (FSK), that is, the modulation and transmission of the signal are realized by adjusting the working frequency of the backscatter signal of the A-IoT device.

[0053] It can be seen that the A-IoT device modulates the incoming signal by means of load modulation to realize the backscatter communication process. Therefore, the A-IoT device has the following advantages:

[0054] 1) The A-IoT device does not actively emit signals, so it does not need a complex radio frequency link, such as a power amplifier (PA), a radio frequency filter, etc.

[0055] 2) The A-IoT device does not need to actively generate high-frequency signals, so it does not need a high-frequency crystal oscillator;

[0056] 3) With backscatter communication, signal transmission does not consume the energy of the A-IoT device itself.

[0057] Based on the energy source and usage of the A-IoT device, the A-IoT device can be divided into the following types:

[0058] 1) Passive A-IoT device

[0059] A-IoT device does not need to be built-in battery, A-IoT device close to network device (for example, RFID system reader), A-IoT device is in the near field range formed by the antenna radiation of network device. Therefore, A-IoT device antenna generates induced current through electromagnetic induction, and the induced current drives the low-power chip circuit of A-IoT device to realize the demodulation of forward link signal (or called downlink or link from network device to A-IoT device) and signal modulation of backward link (or called uplink or link from A-IoT device to network device) and other work. For backscatter link, A-IoT device uses backscatter implementation to transmit signals.

[0060] It can be seen that the passive A-IoT device does not need to be built-in battery to drive, which is a truly A-IoT device.

[0061] Passive A-IoT device does not need battery, and radio frequency circuit and baseband circuit are very simple, for example, it does not need low noise amplifier (LNA), PA, crystal oscillator, analog to digital converter (ADC) and other devices, so it has the advantages of small size, light weight, low price, long service life and so on.

[0062] 2) Semi-passive A-IoT device

[0063] Semi-passive A-IoT device itself does not install a conventional battery, but can use radio frequency (RF) energy harvesting module to collect radio wave energy, or use solar energy, light energy, thermal energy, kinetic energy harvesting module to collect energy, and store the collected energy in an energy storage unit (for example, capacitor). After the energy storage unit obtains energy, it can drive the low-power chip circuit of A-IoT device to realize the demodulation of forward link signal and the signal modulation of backward link and other work. For backscatter link, A-IoT device uses backscatter implementation to transmit signals.

[0064] It can be seen that the semi-passive A-IoT device does not need to be built-in battery to drive, although it uses the energy stored in the capacitor in the work, but the energy comes from the radio energy collected by the energy harvesting module, so it is also a truly A-IoT device.

[0065] Semi-passive A-IoT device inherits many advantages of passive A-IoT device, so it has the advantages of small size, light weight, low price, long service life and so on.

[0066] 3) Active A-IoT device

[0067] Some A-IoT devices used in some scenarios can also be active A-IoT devices, which can be built-in with a battery (e.g., a regular battery, a dry battery, a rechargeable lithium battery, etc.). The battery is used to drive the low-power chip circuit of the A-IoT device to realize demodulation of the forward link signal and signal modulation of the backward link, etc. For the backscatter link, the A-IoT device uses the backscatter mode to transmit signals. Therefore, the zero power consumption of such A-IoT devices mainly reflects that the signal transmission of the backward link does not require the terminal itself power, but uses the backscatter mode. Although the active A-IoT device uses a battery, due to the use of ultra-low power communication technology, the power consumption is very low, so the working life of the battery can be greatly improved compared with the prior art.

[0068] The built-in battery of the active A-IoT device supplies power to the radio frequency identification device (RFID) chip to increase the read-write distance of the tag and improve the reliability of communication. Therefore, it can be applied in some scenarios with relatively high requirements on communication distance, reading delay, etc.

[0069] As known, the business type of the environmental Internet of Things will also be dominated by the industry business as the other Internet of Things business types. Therefore, the A-IoT device based on the transmitter type includes the following types:

[0070] 1) A-IoT device based on backscatter

[0071] Such A-IoT device uses the backscatter mode as described above to transmit uplink data. Such device does not have an active transmitter for active transmission, but only has a backscatter transmitter. Therefore, when such A-IoT device transmits data, the network device needs to provide a carrier and perform backscatter based on the carrier to realize data transmission.

[0072] 2) A-IoT device based on active transmitter

[0073] Such A-IoT device uses an active transmitter with active transmission capability to transmit uplink data, so such A-IoT device can transmit data using its own active transmitter when transmitting data, without the need for the network device to provide a carrier. The active transmitter suitable for A-IoT device can be, for example, an ultra-low power ASK, an ultra-low power FSK transmitter, etc. Based on the current implementation, the overall power consumption of such transmitter can be reduced to 400-600 uw in the case of transmitting a 100 uw signal.

[0074] 3) A-IoT device with both backscatter and active transmitter

[0075] Such A-IoT devices can support both backscattering and active transmitters. A-IoT devices can determine which uplink signal transmission mode to use, e.g., backscattering or active transmitter, based on different situations (e.g., power situation, available ambient energy), or based on network device’s scheduling.

[0076] Low power internet of things based on cellular network

[0077] With the booming development of cellular internet of things, 3GPP has standardized internet of things technologies such as NB-IoT, machine-type communication (MTC), reduced capability (RedCap), etc. However, there are still many scenarios of internet of things communication needs that cannot be met using existing technologies, such as harsh communication environments (e.g., high temperature, extremely low temperature, high humidity, high pressure, high radiation, high-speed motion, etc.), extremely small terminal form factor requirements, extremely low cost, etc.

[0078] Therefore, in order to cover these unmet internet of things communication needs, ultra-low cost, extremely small size, battery-free / maintenance-free internet of things are needed in cellular networks, and environmental internet of things can exactly meet this demand.

[0079] Based on the discussion of the application scenarios of A-IoT devices by 3GPP SA1, A-IoT devices can be used in at least the following four scenarios:

[0080] 1) Object identification, such as logistics, production line product management, supply chain management.

[0081] 2) Environmental monitoring, such as temperature, humidity, harmful gas monitoring of working environment, natural environment.

[0082] 3) Positioning, such as indoor positioning, intelligent lost-and-found, production line article positioning, etc.

[0083] 4) Intelligent control, such as intelligent control of various appliances in smart home (e.g., turning on / off air conditioner, adjusting temperature), intelligent control of various facilities in agricultural greenhouse (e.g., automatic irrigation, fertilization).

[0084] D2R transmission

[0085] Continuing to refer to FIG. 1 and FIG. 2, in a low-power Internet of Things based on a cellular network, an A-IoT device can receive A-IoT control / data / signal from a reader, which can be a network device or an intermediate node. If the A-IoT device sends A-IoT control / data / signal to the reader through backscattering, a carrier needs to be provided to the A-IoT device, and the node providing the carrier can be the reader or another node. In addition, the A-IoT device can send A-IoT control / data / signal to the reader through active transmission.

[0086] When performing D2R transmission, for example, as shown in FIG. 7, the A-IoT device needs to perform D2R transmission according to scheduling information sent by the reader. The scheduling information is carried in a physical reader to device channel (PRDCH), and the scheduling information can be sent through unicast, groupcast, broadcast, etc.

[0087] Before sending a physical device to reader channel (PDRCH) to the reader, the A-IoT device needs to send a preamble, which is used at least for the reader to obtain timing information of D2R. In addition, optionally, there can be other reference signals, such as mid-amble, in the middle of the PDRCH, and there can be a post-amble at the end of the PRDCH, which can be used to further assist the reading node to perform timing estimation, channel estimation, PDRCH length judgment, etc. The specific structure is shown in FIG. 8. The chip length in the embodiment of the present application refers to the period of the expected square wave used by the A-IoT device to modulate the carrier to generate a D2R transmission signal, and the chip lengths of the PDRCH, the preamble and the mid-amble can be the same or different. For example, as shown in FIG. 9, after modulating the carrier signal based on the chip length, a signal frequency for D2R transmission can be obtained. The chip length can also be referred to as the chip period.

[0088] In an environmental Internet of Things, when the reader schedules the A-IoT device to perform D2R transmission, for the A-IoT device using active transmission, the A-IoT device needs to obtain related parameters for D2R to perform D2R transmission with the reader.

[0089] To this end, an embodiment of the present application provides a method of wireless communication, a first device determines first information, the first information includes one or more of information of a frequency of a carrier signal used for D2R transmission (also referred to as carrier frequency or carrier frequency), information of chip length, information of SFS, information of modulation mode, etc., so as to realize D2R transmission with a second device by using the first information.

[0090] It should be noted that modulating the carrier based on the chip length will cause a small frequency shift (SFS) between the actual transmitted signal frequency and the carrier frequency, for example, as shown in FIG. 10. Therefore, it can be understood that the A-IoT device determining the chip length and determining the SFS are equivalent, and in the embodiments of the present application, the determination of the chip length is taken as an example for description.

[0091] It can be understood that, due to the relatively large error of the clock of the A-IoT device, the chip length determined by the A-IoT device is only the expected value of the reader, and the actual chip length generated by the A-IoT device may have a deviation from the expected value, but this does not affect the application of the technical solution of the embodiments of the present application. When the A-IoT device uses the backscattering mode for D2R transmission, the carrier to be modulated is provided by the carrier node, and when the A-IoT device uses the active emission mode for D2R transmission, the carrier is generated by the A-IoT device itself. The technical solution of the embodiments of the present application can be applied to the A-IoT device using active emission, and similarly, due to the low precision of the carrier generated by the local oscillator of the A-IoT device, the carrier frequency determined by the A-IoT device is also the expected value of the reader.

[0092] The embodiments of the present application will be described in detail below in conjunction with FIG. 11.

[0093] FIG. 11 is a flowchart of a wireless communication method provided by the embodiments of the present application. The method 1100 shown in FIG. 11 can be executed by a first device and a second device, the first device can be the first device 110 shown in FIGS. 1 and 2, and the second device can be the second device 120 shown in FIGS. 1 and 2. As an example, the first device can be an A-IoT device based on active emission, and the second device can be a reader.

[0094] Referring to FIG. 11, in step 1110, the first device performs D2R transmission with the second device based on first information.

[0095] The first information can include one or more of the following: information of a carrier frequency; information of a chip length; information of a SFS; information of a modulation mode.

[0096] In some implementations, as shown in FIG. 11, before step 1110, the method 1100 can further include step 1120.

[0097] In step 1120, the second device sends a PRDCH to the first device; correspondingly, the first device receives the PRDCH sent by the second device. The PRDCH carries scheduling information or control information, which is used to schedule or control the D2R transmission in step 1110.

[0098] In the embodiments of the present application, the first information can be determined by the first device or indicated by the second device to the first device. The second device can send the first information to the first device, or the second device can send other information associated with the first information to the first device, so that the first device determines the first information for the D2R transmission based on the other information associated with the first information.

[0099] The first information or the information associated with the first information sent by the second device to the first device can be carried in the PRDCH used to schedule the D2R transmission, or carried in other information sent after the PRDCH. As an example, the PRDCH can carry any one of the information of the carrier frequency, the information of the chip length, the information of the SFS, the information of the modulation mode, or can simultaneously carry several or all of the information of the carrier frequency, the information of the chip length, the information of the SFS, and the information of the modulation mode used for the D2R transmission, for example, the PRDCH can simultaneously carry the information of the carrier frequency and the information of the chip length used for the D2R transmission, or simultaneously carry the information of the carrier frequency, the information of the chip length, and the information of the modulation mode used for the D2R transmission.

[0100] In the following, how the first device obtains the first information is described in detail from the aspects of the carrier frequency, the chip length, and the modulation mode, etc.

[0101] Carrier frequency

[0102] In some implementations, the carrier frequency can include one or more of the following: a predetermined first carrier frequency; a second carrier frequency selected by the first device from a plurality of carrier frequencies supported by the first device; a third carrier frequency indicated by the second device; a fourth carrier frequency determined by the first device based on the second information sent by the second device; and a fifth carrier frequency determined by the first device based on a frequency corresponding to a local oscillator used to receive the PRDCH sent by the second device. In the following, the first carrier frequency, the second carrier frequency, the third carrier frequency, the fourth carrier frequency, and the fifth carrier frequency are described in detail.

[0103] 1) First carrier frequency

[0104] The first carrier frequency can be predetermined or pre-configured. For a first device operating in a specific frequency band, the carrier frequencies supported by the first device can be specific carrier frequencies in the frequency band, i.e., the first carrier frequencies. The first carrier frequencies can be pre-configured, configured by a network device, or configured by a second device, for example. For a first device operating in a frequency band of 890-910 MHz, the carrier frequencies supported by the first device can be 891 MHz, 892 MHz, 893 MHz, …, 909 MHz, and the first carrier frequency can be one of the carrier frequencies. With fixed carrier frequencies, the first device only needs to support one carrier frequency, i.e., the first carrier frequency, which can reduce the implementation complexity of the first device.

[0105] 2) second carrier frequency

[0106] The first device can support multiple carrier frequencies, which can include some or all of the pre-configured, network device configured, or second device configured multiple frequencies, for example.

[0107] The second carrier frequency can be selected from the multiple carrier frequencies supported by the first device. For a frequency band of 890-910 MHz, the carrier frequencies available for D2R transmission can include 891 MHz, 892 MHz, 893 MHz, …, 909 MHz, and the first device can support some of the carrier frequencies. After receiving the PRDCH sent by the reader for scheduling D2R transmission, the first device can select a carrier frequency, i.e., the second carrier frequency, from the multiple carrier frequencies supported by the first device based on its implementation or randomly, and perform D2R transmission based on the second carrier frequency.

[0108] 3) third carrier frequency

[0109] The third carrier frequency is indicated by the second device, i.e., the second device can indicate the carrier frequency, i.e., the third carrier frequency, for D2R transmission to the first device. The third carrier frequency can be carried in the PRDCH sent by the second device, for example.

[0110] The first message in D2R transmission is commonly referred to as A-IoT Msg 1 (hereinafter, also referred to as Msg 1). In some implementations, the first carrier frequency or the second carrier frequency can be used to transmit Msg 1 and other messages after Msg 1; in other implementations, the first carrier frequency or the second carrier frequency can be used to transmit Msg 1, and the third carrier frequency can be used to transmit other messages after Msg 1.

[0111] In some implementations, the first device sends the Msg 1 to the second device, and can carry the multiple carrier frequencies supported by the first device in the Msg 1; accordingly, the second device receives the Msg 1 sent by the first device, determines a third carrier frequency from the multiple carrier frequencies carried in the Msg 1, and indicates the third carrier frequency to the first device.

[0112] For example, when the first device performs the D2R transmission based on the PRDCH sent by the second device, the first device can select a carrier frequency, i.e., a second carrier frequency, from the multiple carrier frequencies supported by the first device to send the Msg 1. The first device can carry the information of the multiple carrier frequencies supported by the first device in the Msg 1. In this way, after receiving the Msg 1, the second device can select a carrier frequency, i.e., a third carrier frequency, from the multiple carrier frequencies supported by the first device, and indicate the third carrier frequency to the first device in the subsequent scheduling, and the first device can use the third carrier frequency to send other messages after the Msg 1. Of course, the first device can also not carry the multiple carrier frequencies supported by the first device when sending the Msg 1, but use the same carrier frequency as the Msg 1 to send other messages after the Msg 1.

[0113] 4) fourth carrier frequency

[0114] The first device can receive the second information sent by the second device, and determine the fourth carrier frequency for the D2R transmission based on the second information.

[0115] In some implementations, the carrier frequency band used by the first device includes multiple sub-bands, and the second information is an index of a target sub-band in the multiple sub-bands. The division of the multiple sub-bands can be pre-configured, configured by a network device, or configured by the second device, for example. The fourth carrier frequency can be determined based on the target sub-band, for example, the fourth carrier frequency can be the center frequency (or center frequency point) of the target sub-band.

[0116] For example, as shown in FIG. 12, for any frequency band or any specific bandwidth carrier, it can be divided into multiple sub-bands, where each sub-band corresponds to a unique sub-band index, and the second device can indicate the fourth carrier frequency by indicating the index of the target sub-band to the first device. The carrier bandwidth shown in FIG. 12 is divided into N sub-bands, and the sub-band indexes of the N sub-bands are index #0, index #1, index #2, index #3, …, index #N-1, respectively, and the center frequencies of the sub-bands are f0, f1, f2, f3, …, fN-1, respectively. N-1. If the second information indicated by the second device to the first device is subband #0, the first device can determine that the carrier frequency for D2R transmission is frequency f0; if the second information indicated by the second device to the first device is subband #1, the first device can determine that the carrier frequency for D2R transmission is frequency f1; if the second information indicated by the second device to the first device is subband #2, the first device can determine that the carrier frequency for D2R transmission is frequency f2; if the second information indicated by the second device to the first device is subband #3, the first device can determine that the carrier frequency for D2R transmission is frequency f3; …; if the second information indicated by the second device to the first device is subband #N-1, the first device can determine that the carrier frequency for D2R transmission is frequency f N-1 .

[0117] It can be understood that, without introducing subbands, this embodiment can be more widely understood as that the first device supports multiple carrier frequencies (for example, f0, f1, f2, f3, …, f N-1 ), wherein each frequency has a corresponding index (for example, index #0, index #1, index #2, index #3, …, index #N-1), and the second device can indicate the carrier frequency for D2R transmission to the first device by indicating the index to the first device.

[0118] The second information can be carried in the PRDCH sent by the second device. For example, the second information can be carried in scheduling information, control information or A-IoT paging in the PRDCH.

[0119] Alternatively, the second device can send third information to the first device after the A-IoT paging message; correspondingly, the first device receives the third information. The third information is used to indicate the time-frequency resource information of Msg 1 in D2R transmission, and the second information can be carried in the third information.

[0120] 5) Fifth carrier frequency

[0121] The fifth carrier frequency can be determined based on the frequency corresponding to the local oscillator, which is the oscillator in the first device for receiving the PRDCH sent by the second device.

[0122] As an example, FIG. 13 and FIG. 14 are schematic diagrams of structures of an intermediate frequency (IF) receiver and a zero intermediate frequency (ZIF) receiver that the first device can support. A local oscillator L0 is used to receive the PRDCH transmitted by the second device for scheduling the D2R transmission. The frequency corresponding to the local oscillator L0 is, for example, the frequency used by the first device to receive the PRDCH, which is close to but can not be exactly the same as the frequency used by the second device to transmit the PRDCH.

[0123] In some implementations, the fifth carrier frequency can be equal to the frequency corresponding to the local oscillator; in other implementations, the fifth carrier frequency can have a relationship with the frequency corresponding to the local oscillator.

[0124] The relationship can include, for example, that the fifth carrier frequency is the sum of the frequency corresponding to the local oscillator and a predetermined frequency interval; or, that the fifth carrier frequency is the sum of the frequency corresponding to the local oscillator and a predetermined first frequency offset; or, that the fifth carrier frequency is the sum of the frequency corresponding to the local oscillator, the frequency interval, and the first frequency offset. In the case where the frequency corresponding to the local oscillator is located in a downlink frequency band of FDD, the frequency interval can be, for example, a guard interval between an uplink frequency band paired with the downlink frequency band, or in other words, a guard interval existing between R2D transmission and D2R transmission.

[0125] Hereinafter, it is assumed that the frequency corresponding to the local oscillator of the first device is F1, the frequency used by the first device for D2R transmission to the second device is F2, the frequency interval is D, and the offset value of the first frequency offset is d, which can be, for example, preconfigured, configured by a network device, or configured by the second device.

[0126] For example, the first device can determine F2 = F1.

[0127] For another example, if F1 is located in a downlink frequency band of FDD, the first device can determine F2 = F1 + D, which facilitates R2D transmission and D2R transmission in different frequency bands in this way.

[0128] For example, the first device can determine F2=F1+d, where for different values of F1, the corresponding d can be different. In this way, flexible frequency domain resource allocation can be achieved. As an example, as shown in FIG. 15, for two different R2D transmissions, i.e., a first R2D transmission and a second R2D transmission, the local oscillator of the first device corresponds to frequencies F11 and F12, respectively. By setting different values of d, e.g., d1 and d2, respectively, the carrier frequency F2 used by the D2R transmission is the same, i.e., F2=F11+d1=F12+d2. That is, different F1s are mapped to the same F2 by different values of d. In this way, the flexibility of scheduling is improved, and the reuse of the same carrier frequency by different devices can be achieved.

[0129] For example, if F1 is located in the downlink frequency band of FDD, the first device can determine F2=F1+D+d, where for different values of F1, the corresponding d can be different. In this way, R2D transmission and D2R transmission in different FDD frequency bands can be achieved, and the flexibility of scheduling is improved.

[0130] Chip length

[0131] In some implementations, the chip length can include one or more of the following: a predetermined first chip length; a second chip length selected by the first device from a plurality of chip lengths supported by the first device; a third chip length indicated by the second device; and a fourth chip length determined by the first device based on fourth information associated with the PRDCH transmitted by the second device and / or the second frequency offset. The first chip length, the second chip length, the third chip length, and the fourth carrier frequency are described in detail below, respectively.

[0132] 1) First chip length

[0133] The first chip length can be predetermined or preconfigured. The first device can only support one chip length, i.e., the first chip length, thereby reducing the implementation complexity of the first device. The first chip length is preconfigured, configured by a network device, or configured by the second device, for example. The use of a fixed chip length can reduce the implementation complexity of the first device.

[0134] 2) Second chip length

[0135] The first device can support a plurality of chip lengths, where the plurality of chip lengths supported by the first device includes some or all of the plurality of lengths preconfigured, configured by a network device, or configured by the second device, for example.

[0136] The second chip length can be selected from a plurality of chip lengths supported by the first device. After receiving the PRDCH sent by the reader for scheduling the D2R transmission, the first device can select a chip length, i.e., the second chip length, from the plurality of chip lengths supported by the first device based on implementation or randomly, and modulate the carrier signal based on the second chip length to form the D2R signal to be transmitted.

[0137] 3) Third chip length

[0138] The third chip length is indicated by the second device, i.e., the second device can indicate the chip length, i.e., the third chip length, for the D2R transmission to the first device. For example, the third chip length can be carried in the PRDCH sent by the second device.

[0139] In some implementations, the first chip length or the second chip length can be used to transmit Msg 1 in the D2R transmission and other messages after Msg 1; in other implementations, the first chip length or the second chip length can be used to transmit Msg 1, and the third chip length can be used to transmit other messages after Msg 1.

[0140] In some implementations, the first device transmits Msg 1 to the second device, and can carry the plurality of chip lengths supported by the first device in Msg 1; accordingly, the second device receives Msg 1 transmitted by the first device, determines the third chip length from the plurality of chip lengths carried in Msg 1, and indicates the third chip length to the first device.

[0141] For example, when the first device performs D2R transmission based on the PRDCH sent by the second device, the first device can select a chip length, i.e., the second chip length, from the plurality of chip lengths supported by the first device to modulate the carrier signal to form Msg 1. The first device can carry information of the plurality of chip lengths supported by the first device in Msg 1. In this way, after receiving Msg 1, the second device can select a chip length, i.e., the third chip length, from the plurality of chip lengths supported by the first device, so as to indicate the third chip length to the first device in subsequent scheduling, and the first device can use the third chip length to modulate the carrier signal to form other messages to be transmitted after Msg 1. Of course, the first device can not carry the plurality of chip lengths supported by the first device when transmitting Msg 1, but use the same chip length as Msg 1 to modulate the carrier signal to form other messages to be transmitted after Msg 1.

[0142] 4) Fourth chip length

[0143] The first device can determine a fourth chip length for the D2R transmission based on fourth information and / or a second frequency offset. The fourth information is associated with the PRDCH transmitted by the second device.

[0144] The fourth information may, for example, comprise one or more of: a preamble of the PRDCH; a termination symbol of the PRDCH; a last chip or chips of the PRDCH; the PRDCH as a whole. As an example, the fourth information can be a chip length of a clock acquisition part in the preamble of the PRDCH, a chip length of the termination symbol, an average of the last chip or chips.

[0145] The second frequency offset may, for example, comprise one or more of: a first predetermined offset value; a second offset value selected from a plurality of predetermined offset values; a third offset value indicated by the second device. The information of the second frequency offset may, for example, be carried in the PRDCH transmitted by the second device. That is, if the information of the second frequency offset is carried in the control information carried in the PRDCH, the first device can use the offset value indicated by the control information, or the first device can select an offset value from the plurality of offset values or use a predetermined offset value to calculate the fourth chip length.

[0146] In some implementations, the first offset value or the second offset value is used to determine the fourth chip length for transmitting the Msg 1 and the fourth chip length for transmitting other messages after the Msg 1; in other implementations, the first offset value or the second offset value is used to determine the fourth chip length for transmitting the Msg 1, and the third offset value is used to determine the fourth chip length for transmitting other messages after the Msg 1.

[0147] In some implementations, the first device can transmit the Msg 1 to the second device; accordingly, the second device receives the Msg 1 transmitted by the first device, determines the third offset value from the plurality of offset values carried in the Msg 1, and indicates the third offset value to the first device.

[0148] For example, since the second device has not obtained the identification (ID) information of the first device when the scheduling device sends the A-IoT Msg 1, the second device cannot schedule the D2R transmission for a specific first device, so the first device can use a predetermined first offset value when sending the Msg 1, or select a second offset value from an optional range, to calculate the fourth chip length for sending the Msg 1. When the second device obtains the identification information of the first device, the second device can schedule the D2R transmission for the first device. At this time, the second device can determine a third offset value from multiple offset values, and indicate the third offset value to the first device in the subsequent scheduling, and the first device can use the third offset value to calculate the fourth chip length for sending other messages after the Msg 1. Of course, the first device can also use the same offset value as the Msg 1 to calculate the fourth chip length for sending other messages after the Msg 1.

[0149] It should be noted that since the SFS and the chip length are related to each other, the determination manner of the SFS can refer to the determination manner of the chip length, which will not be repeated here.

[0150] Modulation manner

[0151] In some implementations, the modulation manner includes: a first modulation manner determined by the first device; and / or, a second modulation manner indicated by the second device. The information of the second modulation manner can be carried in the PRDCH sent by the second device, for example. In the case that the first device supports single sideband modulation, the modulation manner used by the first device can include an upper sideband modulation manner and / or a lower sideband modulation manner, for example.

[0152] In some implementations, the first modulation manner is applied to the Msg 1 in the D2R transmission and other messages after the Msg 1; or, in other implementations, the first modulation manner is applied to the Msg 1 in the D2R transmission, and the second modulation manner is applied to other messages after the Msg 1. The first modulation manner can be an upper sideband modulation manner or a lower sideband modulation manner selected by the first device, for example, and the second modulation manner is an upper sideband modulation manner or a lower sideband modulation manner indicated by the second device, and the first modulation manner and the second modulation manner can be the same or different.

[0153] In the embodiments of the present application, the “selection” performed by the first device and the second device can be random selection, or selection based on a predetermined rule or internal implementation, which is not limited in the present application.

[0154] It should be noted that the above schemes for determining the carrier frequency, the chip length, the SFS, and the modulation mode can be implemented separately or in any combination. For example, the carrier frequency and the chip length used by the first device are both fixed; for another example, the carrier frequency used by the first device is fixed, and the chip length is selected by the first device from among a plurality of chip lengths supported by the first device; for another example, the carrier frequency used by the first device is fixed, and the second device indicates the chip length or information (e.g., the second frequency offset) used to determine the chip length to the first device; for another example, the carrier frequency is selected by the first device from among a plurality of carrier frequencies supported by the first device, and the chip length is fixed; for another example, the carrier frequency is selected by the first device from among a plurality of carrier frequencies supported by the first device, and the chip length is selected by the first device from among a plurality of chip lengths supported by the first device; for another example, the carrier frequency is selected by the first device from among a plurality of carrier frequencies supported by the first device, and the second device indicates the chip length or information (e.g., the second frequency offset) used to determine the chip length to the first device; for another example, the second device indicates the carrier frequency or information (e.g., the subband index) associated with the carrier frequency to the first device, and the chip length is fixed; for another example, the second device indicates the carrier frequency or information (e.g., the subband index) associated with the carrier frequency to the first device, and the chip length is selected by the first device from among a plurality of chip lengths supported by the first device; for another example, the second device indicates the carrier frequency or information (e.g., the subband index) associated with the carrier frequency to the first device, and the second device indicates the chip length or information (e.g., the second frequency offset) used to determine the chip length to the first device; for another example, the first device determines the carrier frequency used for D2R transmission based on a frequency corresponding to a local oscillator used to receive the PRDCH, and the chip length is fixed; for another example, the first device determines the carrier frequency used for D2R transmission based on a frequency corresponding to a local oscillator used to receive the PRDCH, and the chip length is selected by the first device from among a plurality of chip lengths supported by the first device; for another example, the first device determines the carrier frequency used for D2R transmission based on a frequency corresponding to a local oscillator used to receive the PRDCH, and the second device indicates the chip length or information (e.g., the second frequency offset) used to determine the chip length to the first device.

[0155] The method for determining the carrier frequency, the chip length, the SFS, and the modulation mode provided by the embodiments of the present application can improve the system capacity, and by reasonably selecting different carrier frequencies, chip lengths, SFSs, modulation modes, and the like, the interference between D2R transmissions of different first devices can be reduced.

[0156] The method embodiments of the present application are described in detail above in combination with FIG. 1 to FIG. 15, and the device embodiments of the present application are described in detail below in combination with FIG. 16 to FIG. 18. It should be understood that the description of the method embodiments corresponds to the description of the device embodiments, and therefore, the parts not described in detail can be referred to the foregoing method embodiments.

[0157] FIG. 16 is a structural schematic diagram of a communication device provided by an embodiment of the present application. The communication device shown in FIG. 16 is a first device. As shown in FIG. 16, the communication device 1600 can include a transceiver 1610. The transceiver 1610 is configured to perform D2R transmission with a second device based on first information. The first information includes one or more of the following: information of a carrier frequency; information of a chip length; information of an SFS; information of a modulation mode.

[0158] In some implementations, the carrier frequency includes one or more of the following: a predetermined first carrier frequency; a second carrier frequency selected by the first device from a plurality of carrier frequencies supported by the first device; a third carrier frequency indicated by the second device; a fourth carrier frequency determined by the first device based on second information transmitted by the second device; and a fifth carrier frequency determined by the first device based on a frequency corresponding to a local oscillator used by the first device to receive a PRDCH transmitted by the second device.

[0159] In some implementations, the first carrier frequency or the second carrier frequency is used to transmit a message Msg1 in the D2R transmission and other messages after the Msg1; or the first carrier frequency or the second carrier frequency is used to transmit the Msg1, and the third carrier frequency is used to transmit other messages after the Msg1.

[0160] In some implementations, the transceiver 1610 is further configured to transmit the Msg1 to the second device, and the Msg1 carries the plurality of carrier frequencies, and the third carrier frequency is determined by the second device from the plurality of carrier frequencies and indicated to the first device.

[0161] In some implementations, the first carrier frequency is preconfigured, configured by a network device, or configured by the second device; and / or the plurality of carrier frequencies includes part or all of a plurality of frequencies preconfigured, configured by the network device, or configured by the second device.

[0162] In some implementations, a carrier frequency band used by the first device includes a plurality of sub-bands, and the second information is an index of a target sub-band in the plurality of sub-bands.

[0163] In some embodiments, the fourth carrier frequency is a center frequency of the target sub-band.

[0164] In some embodiments, the transceiver 1610 is further configured to receive a PRDCH transmitted by the second device, and the information of the third carrier frequency and / or the second information is carried in the PRDCH.

[0165] In some embodiments, the PRDCH comprises an ambient Internet of Things (A-IoT) paging message, and the transceiver 1610 is further configured to receive third information transmitted by the second device after the A-IoT paging message, the third information being used to indicate time-frequency resource information of Msg 1 in the D2R transmission, and the second information being carried in the third information.

[0166] In some embodiments, the fifth carrier frequency is equal to the frequency corresponding to the local oscillator, or the fifth carrier frequency has a correlation relationship with the frequency corresponding to the local oscillator.

[0167] In some embodiments, the correlation relationship comprises that the fifth carrier frequency is a sum of the frequency corresponding to the local oscillator and a predetermined frequency interval, or the fifth carrier frequency is a sum of the frequency corresponding to the local oscillator and a predetermined first frequency offset, or the fifth carrier frequency is a sum of the frequency corresponding to the local oscillator, the frequency interval, and the first frequency offset, wherein in a case where the frequency corresponding to the local oscillator is located in a downlink frequency band of frequency division duplex (FDD), the frequency interval is an interval between an uplink frequency band paired with the downlink frequency band and the downlink frequency band.

[0168] In some embodiments, the chip length comprises one or more of the following: a predetermined first chip length, a second chip length selected by the first device from a plurality of chip lengths supported by the first device, a third chip length indicated by the second device, and a fourth chip length determined by the first device based on fourth information and / or a second frequency offset, the fourth information being associated with a PRDCH transmitted by the second device.

[0169] In some embodiments, the first chip length or the second chip length is used to transmit Msg 1 in the D2R transmission and other messages after the Msg 1, or the first chip length or the second chip length is used to transmit the Msg 1, and the third chip length is used to transmit other messages after the Msg 1.

[0170] In some embodiments, the transceiver 1610 is further configured to: send, to the second device, the Msg 1, the Msg 1 carrying the plurality of chip lengths, the third chip length being determined by the second device from the plurality of chip lengths and indicated to the first device.

[0171] In some embodiments, the first chip length is pre-configured, network device configured, or second device configured; and / or, the plurality of chip lengths comprises part or all of a plurality of lengths pre-configured, network device configured, or second device configured.

[0172] In some embodiments, the fourth information comprises one or more of: a preamble of the PRDCH; a termination symbol of the PRDCH; a last chip or chips of the PRDCH; the PRDCH as a whole.

[0173] In some embodiments, the second frequency offset comprises one or more of: a first offset value pre-determined; a second offset value selected from a plurality of offset values pre-determined; a third offset value indicated by the second device.

[0174] In some embodiments, the first offset value or the second offset value is used to determine a fourth chip length for sending the Msg 1 in the D2R transmission and a fourth chip length for sending other messages after the Msg 1; or, the first offset value or the second offset value is used to determine a fourth chip length for sending the Msg 1 in the D2R transmission, and the third offset value is used to determine a fourth chip length for sending other messages after the Msg 1.

[0175] In some embodiments, the transceiver 1610 is further configured to: send, to the second device, the Msg 1, the Msg 1 carrying the plurality of offset values, the third offset value being determined by the second device from the plurality of offset values and indicated to the first device.

[0176] In some embodiments, the transceiver 1610 is further configured to: receive a PRDCH sent by the second device, the information of the third chip length and / or the second frequency offset being carried in the PRDCH.

[0177] In some embodiments, the modulation manner comprises: a first modulation manner determined by the first device; and / or, a second modulation manner indicated by the second device.

[0178] In some embodiments, the transceiver 1610 is further configured to: receive a PRDCH sent by the second device, the information of the second modulation manner being carried in the PRDCH.

[0179] In some embodiments, the first device supports single sideband modulation, and the modulation mode includes an upper sideband modulation mode and / or a lower sideband modulation mode.

[0180] In some embodiments, the first modulation mode is applied to Msg 1 in the D2R transmission and other messages after the Msg 1; or the first modulation mode is applied to Msg 1 in the D2R transmission, and the second modulation mode is applied to other messages after the Msg 1.

[0181] In some embodiments, the first device is an A-IoT device, and the second device is a reader; and / or, the D2R transmission is an active transmission-based D2R transmission.

[0182] It can be understood that the transceiver unit 1610 may, for example, be the transceiver 1830. In addition, the communication device 1600 optionally further includes a processor 1810 and a memory 1820, as shown in FIG. 18.

[0183] FIG. 17 is a structural schematic diagram of a communication device provided by an embodiment of the present application. The communication device shown in FIG. 17 is a second device. As shown in FIG. 17, the communication device 1700 can include a transceiver unit 1710. The transceiver unit 1710 is configured to send first information or information associated with the first information to a first device, the first information being used for D2R transmission between the first device and the second device; wherein the first information includes one or more of the following: information of a carrier frequency; information of a chip length; information of an SFS; information of a modulation mode.

[0184] In some embodiments, the carrier frequency includes a third carrier frequency; and / or, the information associated with the carrier frequency includes second information, the second information being used for determining a fourth carrier frequency.

[0185] In some embodiments, the third carrier frequency is used for sending other messages after a message Msg 1 in the D2R transmission.

[0186] In some embodiments, the transceiver unit 1710 is further configured to: the second device receives the Msg 1 sent by the first device, and the Msg 1 carries information of a plurality of carrier frequencies supported by the first device; and the second device determines the third carrier frequency from the plurality of carrier frequencies.

[0187] In some embodiments, a carrier frequency band used by the first device includes a plurality of sub-bands, and the second information is an index of a target sub-band in the plurality of sub-bands.

[0188] In some embodiments, the fourth carrier frequency is a center frequency of the target sub-band.

[0189] In some embodiments, the transceiver 1710 is further configured to send, to the first device, a PRDCH, and the information of the third carrier frequency and / or the second information is carried in the PRDCH.

[0190] In some embodiments, the PRDCH comprises an Ambient Internet of Things (A-IoT) paging message, and the transceiver 1710 is further configured to send, to the first device, third information after the A-IoT paging message, the third information being used to indicate time-frequency resource information of Msg 1 in the D2R transmission, and the second information is carried in the third information.

[0191] In some embodiments, the chip length comprises a third chip length, and the information associated with the chip length comprises fourth information and / or a second frequency offset, the fourth information being associated with a PRDCH sent by the second device, and the fourth information and the second frequency offset are used to determine a fourth chip length.

[0192] In some embodiments, the third chip length is used to send other messages after the Msg 1 in the D2R transmission.

[0193] In some embodiments, the communication device 1700 further comprises a processing unit 1720, and the transceiver 1710 is further configured to receive the Msg 1 sent by the first device, the Msg 1 carrying information of a plurality of chip lengths supported by the first device, and the processing unit 1720 is configured to determine the third chip length from the plurality of chip lengths.

[0194] In some embodiments, the fourth information comprises one or more of the following: a preamble of the PRDCH; a termination symbol of the PRDCH; a last chip or chips of the PRDCH; and the PRDCH as a whole.

[0195] In some embodiments, the second frequency offset comprises a third offset value, and the third offset value is used to determine a fourth chip length used to send other messages after the Msg 1.

[0196] In some embodiments, the communication device 1700 further comprises a processing unit 1720, and the transceiver 1710 is further configured to receive the Msg 1 sent by the first device, the Msg 1 carrying information of a plurality of offset values, and the processing unit 1720 is configured to determine the third offset value from the plurality of offset values.

[0197] In some embodiments, the transceiver 1710 is further configured to send, to the first device, a PRDCH, wherein information of the third chip length and / or the second frequency offset is carried in the PRDCH.

[0198] In some embodiments, the first device supports a single sideband modulation, and the modulation mode comprises an upper sideband modulation mode and / or a lower sideband modulation mode.

[0199] In some embodiments, the modulation mode is applied to other messages after the Msg 1.

[0200] In some embodiments, the transceiver 1710 is further configured to send, to the first device, a PRDCH, wherein information of the modulation mode is carried in the PRDCH.

[0201] In some embodiments, the first device is an A-IoT device, and the second device is a reader; and / or, the D2R transmission is an active transmission based D2R transmission.

[0202] It can be understood that the transceiver 1710 may, for example, be a transceiver 1830. In addition, the communication device 1700 optionally further includes a processor 1810 and a memory 1820, as shown in FIG. 18.

[0203] FIG. 18 is a schematic structural diagram of an apparatus for communication according to an embodiment of the present application. The dashed lines shown in FIG. 18 indicate that the unit or module is optional. The apparatus 1800 can be used to implement the method described in the above method embodiments. The apparatus 1800 may, for example, be a chip, a first device or a second device.

[0204] The apparatus 1800 can include one or more processors 1810. The processor 1810 can support the apparatus 1800 to implement the method described in the above method embodiments. The processor 1810 can be a general purpose processor or a dedicated processor. For example, the processor 1810 can be a central processing unit (CPU). Alternatively, the processor 1810 can also be other general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gates or transistor logic components, discrete hardware components, etc. The general purpose processor can be a microprocessor or can be any conventional processor.

[0205] The apparatus 1800 can further include one or more memories 1820. The memories 1820 store a program for execution by the processor 1810, such that the processor 1810 performs the methods described in the above method embodiments. The memories 1820 can be independent of the processor 1810, or can also be integrated in the processor 1810.

[0206] The apparatus 1800 can further include a transceiver 1830. The processor 1810 can communicate with other devices or chips through the transceiver 1830. For example, the processor 1810 can perform data transceiving with other devices or chips through the transceiver 1830.

[0207] Embodiments of the present application also provide a communication system. The communication system includes the first device and the second device described above. In some implementations, the system further includes other devices that interact with the first device and the second device.

[0208] Embodiments of the present application also provide a computer readable storage medium for storing a program. The computer readable storage medium can be applied in the first device or the second device provided by the embodiments of the present application, and the program causes the computer to perform the method performed by the first device or the second device in the various embodiments of the present application.

[0209] Embodiments of the present application also provide a computer program product. The computer program product includes a program. The computer program product can be applied in the first device or the second device provided by the embodiments of the present application, and the program causes the computer to perform the method performed by the first device or the second device in the various embodiments of the present application.

[0210] Embodiments of the present application also provide a computer program. The computer program can be applied in the first device or the second device provided by the embodiments of the present application, and the computer program causes the computer to perform the method performed by the first device or the second device in the various embodiments of the present application.

[0211] It should be understood that the terms "system" and "network" can be used interchangeably in the embodiments of the present application. In addition, the terms used in the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. The terms "first", "second", "third", and "fourth" and the like in the specification and claims of the present application and the drawings are used to distinguish different objects, and are not used to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0212] In the embodiments of the present application, the "indication" mentioned can be direct indication, or indirect indication, or can be an indication that has an associated relationship. For example, A indicates B, which can mean that B can be obtained by A; or A indirectly indicates B, for example, A indicates C, and B can be obtained by C; or A and B have an associated relationship.

[0213] In the embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean that B is determined only according to A, but B can also be determined according to A and / or other information.

[0214] In the embodiments of the present application, the term "corresponding" can mean that there is a direct or indirect corresponding relationship between the two, or can mean that there is an associated relationship between the two, or can mean an indication and being indicated, configuration and being configured, and the like.

[0215] In the embodiments of the present application, "predefined" or "preconfigured" can be implemented by pre-saving corresponding codes, tables or other information that can be used to indicate related information in devices (for example, including the first device and the second device), and the present application does not limit the specific implementation manner. For example, the predefinition can mean the definition in the protocol.

[0216] In the embodiments of the present application, the "protocol" can refer to a standard protocol in the communication field, for example, can include the LTE protocol, the NR protocol and the related protocol applied to the future communication system, and the present application does not limit this.

[0217] In the embodiments of the present application, the term "and / or" is only a description of the associated relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this paper generally means that the front and rear associated objects have an "or" relationship.

[0218] In various embodiments of the present application, the size of the serial number of the above processes does not mean the execution order, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0219] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented by other manners. For example, the above-described device embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and in actual implementation, another division manner can be adopted, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0220] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place or distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0221] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0222] In the above embodiments, all or part of the embodiments can be realized by software, hardware, firmware or any combination thereof. When realized by software, all or part of the embodiments can be realized in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable devices. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another, for example, the computer instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer readable storage medium can be any available medium readable by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be magnetic media (such as floppy disk, hard disk, magnetic tape), optical media (such as digital video disc (DVD)) or semiconductor media (such as solid state disk (SSD)) and the like.

[0223] The above description is only specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of wireless communication, comprising: Comprising: The first device performs a device-to-reader (D2R) transmission with a second device based on first information; Wherein, the first information comprises one or more of the following: Information of a carrier frequency; Information of a chip length; Information of a small frequency shift (SFS); Information of a modulation mode.

2. The method of claim 1, wherein, The carrier frequency comprises one or more of the following: A predetermined first carrier frequency; A second carrier frequency selected by the first device from a plurality of carrier frequencies supported by the first device; A third carrier frequency indicated by the second device; A fourth carrier frequency determined by the first device based on second information sent by the second device; A fifth carrier frequency determined by the first device based on a frequency corresponding to a local oscillator used by the first device to receive a physical reader-to-device channel (PRDCH) sent by the second device.

3. The method of claim 2, wherein: The first carrier frequency or the second carrier frequency is used to transmit a message (Msg 1) in the D2R transmission and other messages after the Msg 1; or The first carrier frequency or the second carrier frequency is used to transmit the Msg 1, and the third carrier frequency is used to transmit other messages after the Msg 1.

4. The method of claim 3, wherein, The method further comprises: The first device sends the Msg 1 to the second device, the Msg 1 carrying the plurality of carrier frequencies, and the third carrier frequency being determined by the second device from the plurality of carrier frequencies and indicated to the first device.

5. The method of any one of claims 2 to 4, wherein: The first carrier frequency is pre-configured, configured by a network device, or configured by the second device; and / or The plurality of carrier frequencies comprises part or all of a plurality of frequencies pre-configured, configured by a network device, or configured by the second device.

6. The method according to any one of claims 2 to 5, characterized in that, The carrier frequency band used by the first device comprises a plurality of sub-bands, and the second information is an index of a target sub-band in the plurality of sub-bands.

7. The method of claim 6, wherein, The fourth carrier frequency is a center frequency of the target sub-band.

8. The method according to any one of claims 2 to 7, characterized in that, The method further comprises: The first device receives a PRDCH sent by the second device, and information of the third carrier frequency and / or the second information is carried in the PRDCH.

9. The method according to any one of claims 2 to 7, characterized in that, The PRDCH comprises an ambient Internet of Things (A-IoT) paging message, and the method further comprises: The first device receives third information sent by the second device after the A-IoT paging message, the third information being used to indicate time-frequency resource information of a Msg 1 in the D2R transmission, and the second information being carried in the third information.

10. The method of any one of claims 2 to 9, wherein: The fifth carrier frequency is equal to the frequency corresponding to the local oscillator; or The fifth carrier frequency has a correlation relationship with the frequency corresponding to the local oscillator.

11. The method of claim 10, wherein, The correlation relationship comprises: The fifth carrier frequency is a sum of the frequency corresponding to the local oscillator and a predetermined frequency interval; or, The fifth carrier frequency is a sum of the frequency corresponding to the local oscillator and a predetermined first frequency offset; or The fifth carrier frequency is a sum of the frequency corresponding to the local oscillator, the frequency interval, and the first frequency offset. In a case where the frequency corresponding to the local oscillator is located in a downlink frequency band of frequency division duplex (FDD), the frequency interval is an interval between an uplink frequency band paired with the downlink frequency band and the downlink frequency band.

12. The method according to any one of claims 1 to 11, characterized in that, The chip length includes one or more of the following: A predetermined first chip length; A second chip length selected by the first device from a plurality of chip lengths supported by the first device; A third chip length indicated by the second device; A fourth chip length determined by the first device based on fourth information and / or a second frequency offset, the fourth information being associated with a PRDCH transmitted by the second device.

13. The method of claim 12, wherein The first chip length or the second chip length is used for transmitting a Msg 1 in the D2R transmission and other messages after the Msg 1; or The first chip length or the second chip length is used for transmitting the Msg 1, and the third chip length is used for transmitting other messages after the Msg 1. The method further includes:

14. The method of claim 13, wherein, The first device transmits, to the second device, the Msg 1, the Msg 1 carrying the plurality of chip lengths, and the third chip length being determined by the second device from the plurality of chip lengths and indicated to the first device.

15. The method of any one of claims 12-14, wherein The first chip length is pre-configured, configured by a network device, or configured by the second device; and / or The plurality of chip lengths include part or all of a plurality of lengths pre-configured, configured by a network device, or configured by the second device. The fourth information includes one or more of the following:

16. The method according to any one of claims 12 to 15, characterized in that, A preamble of the PRDCH; A termination symbol of the PRDCH; A last chip or chips of the PRDCH; The PRDCH as a whole. The second frequency offset includes one or more of the following determinations:

17. The method according to any one of claims 12 to 16, characterized in that, A predetermined first offset value; A second offset value selected from a plurality of predetermined offset values; A third offset value indicated by the second device.

18. The method of claim 17, wherein The first offset value or the second offset value is used for determining a fourth chip length for transmitting a Msg 1 in the D2R transmission and a fourth chip length for transmitting other messages after the Msg 1; or The first offset value or the second offset value is used for determining a fourth chip length for transmitting a Msg 1 in the D2R transmission, and the third offset value is used for determining a fourth chip length for transmitting other messages after the Msg 1. The method further includes:

19. The method of claim 18, wherein, ​ The first device sends the Msg 1 to the second device, the Msg 1 carrying the plurality of offset values, the third offset value being determined by the second device from the plurality of offset values and indicated to the first device.

20. The method of any one of claims 12-19, wherein, The method further includes: The first device receives a PRDCH sent by the second device, information of the third chip length and / or the second frequency offset being carried in the PRDCH.

21. The method of any one of claims 1 to 20, wherein, The modulation mode includes: a first modulation mode determined by the first device; and / or, a second modulation mode indicated by the second device.

22. The method of claim 21, wherein, The method further includes: The first device receives a PRDCH sent by the second device, information of the second modulation mode being carried in the PRDCH.

23. The method of any one of claims 1 to 22, wherein, The first device supports single sideband modulation, the modulation mode including an upper sideband modulation mode and / or a lower sideband modulation mode.

24. The method of any one of claims 21 to 23, wherein: the first modulation mode is applied to the Msg 1 in the D2R transmission and other messages after the Msg 1; or the first modulation mode is applied to the Msg 1 in the D2R transmission, and the second modulation mode is applied to other messages after the Msg 1.

25. The method of any one of claims 1 to 24, wherein: the first device is an ambient Internet of Things (A-IoT) device, and the second device is a reader; and / or the D2R transmission is an active transmission based D2R transmission.

26. A method of wireless communication, comprising: comprises: a second device sending first information or information associated with the first information to a first device, the first information being used for a device-to-reader (D2R) transmission between the first device and the second device; wherein the first information includes one or more of: information of a carrier frequency; information of a chip length; information of a small frequency shift (SFS); information of a modulation mode.

27. The method of claim 26, wherein: the carrier frequency includes a third carrier frequency; and / or the information associated with the carrier frequency includes second information, the second information being used for determining a fourth carrier frequency.

28. The method of claim 27, wherein, the third carrier frequency is used for transmitting other messages after a message (Msg 1) in the D2R transmission.

29. The method of claim 28, wherein, The method further includes: The second device receives the Msg 1 sent by the first device, the Msg 1 carrying information of a plurality of carrier frequencies supported by the first device; The second device determines the third carrier frequency from the plurality of carrier frequencies.

30. The method of any one of claims 27-29, wherein, The carrier frequency band used by the first device includes a plurality of sub-bands, and the second information is an index of a target sub-band in the plurality of sub-bands.

31. The method of claim 30, wherein, The fourth carrier frequency is a center frequency of the target sub-band.

32. The method of any one of claims 27-31, wherein, The method further includes: The second device sends a physical reader-to-device channel (PRDCH) to the first device, information of the third carrier frequency and / or the second information being carried in the PRDCH.

33. The method of any one of claims 27-31, wherein, The PRDCH includes an ambient Internet of Things (A-IoT) paging message, and the method further includes: The second device sends third information to the first device after the A-IoT paging message, the third information being used for indicating time-frequency resource information of Msg 1 in the D2R transmission, the second information being carried in the third information.

34. The method of any one of claims 26-33, wherein: the chip length comprises a third chip length; the information associated with the chip length comprises fourth information and / or a second frequency offset, the fourth information being associated with a PRDCH sent by the second device, the fourth information and the second frequency offset being used for determining a fourth chip length.

35. The method of claim 34, wherein, the third chip length is used for sending other messages after the Msg 1 in the D2R transmission.

36. The method of claim 35, wherein, The method further comprises: the second device receives the Msg 1 sent by the first device, the Msg 1 carrying information of a plurality of chip lengths supported by the first device; the second device determines the third chip length from the plurality of chip lengths.

37. The method of any one of claims 34-36, wherein, the fourth information comprises one or more of: a preamble of the PRDCH; a termination symbol of the PRDCH; a last one or more chips of the PRDCH; the PRDCH as a whole.

38. The method of any one of claims 34-37, wherein, the second frequency offset comprises a third offset value, the third offset value being used for determining a fourth chip length used for sending other messages after the Msg 1.

39. The method of claim 38, wherein, The method further comprises: the second device receives the Msg 1 sent by the first device, the Msg 1 carrying information of a plurality of offset values; the second device determines the third offset value from the plurality of offset values.

40. The method of any one of claims 34-39, wherein, The method further comprises: the second device sends a PRDCH to the first device, information of the third chip length and / or the second frequency offset being carried in the PRDCH.

41. The method of any one of claims 26-40, wherein, the first device supports a single sideband modulation, the modulation mode comprising an upper sideband modulation mode and / or a lower sideband modulation mode.

42. The method of any one of claims 26-41, wherein, the modulation mode is applied to other messages after the Msg 1.

43. The method of any one of claims 26-42, wherein, The method further comprises: the second device sends a PRDCH to the first device, information of the modulation mode being carried in the PRDCH.

44. The method of any one of claims 26-43, wherein: the first device is an ambient Internet of Things (A-IoT) device, and the second device is a reader; and / or the D2R transmission is an active transmission based D2R transmission.

45. A communications device, characterized by The communication device is a first device, comprising: a transceiver configured to perform a device-to-reader (D2R) transmission with a second device based on first information; wherein the first information comprises one or more of: information of a carrier frequency; information of a chip length; information of a small frequency shift (SFS); information of a modulation mode.

46. The communication device of claim 45, wherein, the carrier frequency comprises one or more of: a predetermined first carrier frequency; a second carrier frequency selected by the first device from a plurality of carrier frequencies supported by the first device; a third carrier frequency indicated by the second device. a fourth carrier frequency determined by the first device based on second information transmitted by the second device; a fifth carrier frequency determined by the first device based on a frequency corresponding to a local oscillator used by the first device to receive a physical reader-to-device channel (PRDCH) transmitted by the second device. 47.The communication device of claim 46, wherein, the first carrier frequency or the second carrier frequency is used to transmit a message Msg 1 in the D2R transmission and other messages after the Msg 1; or the first carrier frequency or the second carrier frequency is used to transmit the Msg 1, and the third carrier frequency is used to transmit other messages after the Msg 1.

48. The communication device of claim 47, wherein, the transceiver is further configured to: transmit, to the second device, the Msg 1, the Msg 1 carrying the plurality of carrier frequencies, the third carrier frequency being determined by the second device from the plurality of carrier frequencies and indicated to the first device. 49.The communication device of any one of claims 46-48, wherein, the first carrier frequency is pre-configured, configured by a network device, or configured by the second device; and / or the plurality of carrier frequencies comprises part or all of a plurality of frequencies pre-configured, configured by the network device, or configured by the second device.

50. The communication device of any one of claims 46-49, wherein, the plurality of sub-bands comprises a target sub-band, and the second information is an index of the target sub-band.

51. The communication device of claim 50, wherein, the fourth carrier frequency is a center frequency of the target sub-band.

52. The communication device of any one of claims 46 to 51, wherein, the transceiver is further configured to: receive a PRDCH transmitted by the second device, the information of the third carrier frequency and / or the second information being carried in the PRDCH.

53. The communication device of any one of claims 46-51, wherein, the PRDCH comprises an A-IoT paging message, and the transceiver is further configured to: receive third information transmitted by the second device after the A-IoT paging message, the third information being used to indicate time-frequency resource information of a Msg 1 in the D2R transmission, the second information being carried in the third information. 54.The communication device of any one of claims 46-53, wherein, the fifth carrier frequency is equal to the frequency corresponding to the local oscillator; or the fifth carrier frequency has a correlation with the frequency corresponding to the local oscillator.

55. The communication device of claim 54, wherein, the correlation comprises: the fifth carrier frequency is a sum of the frequency corresponding to the local oscillator and a predetermined frequency interval; or the fifth carrier frequency is a sum of the frequency corresponding to the local oscillator and a predetermined first frequency offset; or the fifth carrier frequency is a sum of the frequency corresponding to the local oscillator, the frequency interval, and the first frequency offset; wherein, in a case where the frequency corresponding to the local oscillator is located in a downlink frequency band of a frequency division duplex (FDD), the frequency interval is an interval between an uplink frequency band paired with the downlink frequency band and the downlink frequency band.

56. The communication device of any one of claims 45 to 55, wherein, the chip length comprises one or more of the following: a predetermined first chip length; and / or a predetermined second chip length. a second chip length selected by the first device from a plurality of chip lengths supported by the first device; a third chip length indicated by the second device; a fourth chip length determined by the first device based on fourth information and / or a second frequency offset, the fourth information being associated with a PRDCH transmitted by the second device.

57. The communication device of claim 56, wherein, the first chip length or the second chip length is used for transmitting a Msg 1 in the D2R transmission and other messages after the Msg 1; or, the first chip length or the second chip length is used for transmitting the Msg 1, and the third chip length is used for transmitting other messages after the Msg 1.

58. The communication device of claim 57, wherein, the transceiver is further configured to: transmit, to the second device, the Msg 1, the Msg 1 carrying the plurality of chip lengths, the third chip length being determined by the second device from the plurality of chip lengths and indicated to the first device.

59. The communication device of any one of claims 56-58, wherein, the first chip length is pre-configured, configured by a network device, or configured by the second device; and / or, the plurality of chip lengths comprises part or all of a plurality of lengths pre-configured, configured by a network device, or configured by the second device.

60. The communication device of any one of claims 56-59, wherein, the fourth information comprises one or more of: a preamble of the PRDCH; a termination symbol of the PRDCH; one or more last chips of the PRDCH; the PRDCH as a whole.

61. The communication device of any one of claims 56 to 60, wherein, the second frequency offset comprises one or more of: a first offset value predetermined; a second offset value selected from a plurality of predetermined offset values; a third offset value indicated by the second device.

62. The communication device of claim 61, wherein, the first offset value or the second offset value is used for determining a fourth chip length for transmitting a Msg 1 in the D2R transmission and a fourth chip length for transmitting other messages after the Msg 1; or, the first offset value or the second offset value is used for determining a fourth chip length for transmitting a Msg 1 in the D2R transmission, and the third offset value is used for determining a fourth chip length for transmitting other messages after the Msg 1.

63. The communication device of claim 62, wherein, the transceiver is further configured to: transmit, to the second device, the Msg 1, the Msg 1 carrying the plurality of offset values, the third offset value being determined by the second device from the plurality of offset values and indicated to the first device.

64. The communication device of any one of claims 56 to 63, wherein, the transceiver is further configured to: receive a PRDCH transmitted by the second device, information of the third chip length and / or the second frequency offset being carried in the PRDCH.

65. The communication device according to any one of claims 45 to 64, wherein, the modulation manner comprises: a first modulation manner determined by the first device; and / or, a second modulation manner indicated by the second device.

66. The communication device of claim 65, wherein, the transceiver is further configured to: receive a PRDCH sent by the second device, wherein the information of the second modulation mode is carried in the PRDCH.

67. The communication device of any one of claims 45 to 66, wherein, The first device supports single sideband modulation, and the modulation mode includes an upper sideband modulation mode and / or a lower sideband modulation mode.

68. The communication device of any one of claims 65-67, The first modulation mode is applied to Msg 1 in the D2R transmission and other messages after the Msg 1; or The first modulation mode is applied to Msg 1 in the D2R transmission, and the second modulation mode is applied to other messages after the Msg 1.

69. The communication device of any one of claims 45-68, The first device is an environmental Internet of Things (A-IoT) device, and the second device is a reader; and / or The D2R transmission is an active transmission-based D2R transmission.

70. A communications device, characterized by The communication device is a second device, comprising: a transceiver configured to send first information or information associated with the first information to a first device, wherein the first information is used for device-to-reader (D2R) transmission between the first device and the second device; The first information includes one or more of the following: information of a carrier frequency; information of a chip length; information of a small frequency shift (SFS); information of a modulation mode.

71. The communication device of claim 70, The carrier frequency includes a third carrier frequency; and / or The information associated with the carrier frequency includes second information used to determine a fourth carrier frequency.

72. The communication device of claim 71, wherein, The third carrier frequency is used to send other messages after Msg 1 in the D2R transmission.

73. The communication device of claim 72, wherein, The transceiver is further configured to: receive the Msg 1 sent by the first device, wherein the Msg 1 carries information of a plurality of carrier frequencies supported by the first device; determine the third carrier frequency from the plurality of carrier frequencies.

74. The communication device of any one of claims 71 to 73, wherein, The carrier frequency band used by the first device includes a plurality of sub-bands, and the second information is an index of a target sub-band in the plurality of sub-bands.

75. The communication device of claim 74, wherein, The fourth carrier frequency is a center frequency of the target sub-band.

76. The communication device of any one of claims 71 to 75, wherein, The transceiver is further configured to: send a physical reader-to-device channel (PRDCH) to the first device, wherein the information of the third carrier frequency and / or the second information is carried in the PRDCH.

77. The communication device of any one of claims 71 to 75, wherein, The PRDCH includes an environmental Internet of Things (A-IoT) paging message, and the transceiver is further configured to: send third information to the first device after the A-IoT paging message, wherein the third information is used to indicate time-frequency resource information of Msg 1 in the D2R transmission, and the second information is carried in the third information.

78. The communication device of any one of claims 70-77, The chip length includes a third chip length; The information associated with the chip length comprises fourth information associated with a PRDCH transmitted by the second device and / or a second frequency offset, the fourth information and the second frequency offset being used to determine a fourth chip length.

79. The communication device of claim 78, wherein, The third chip length is used to transmit other messages after the Msg 1 in the D2R transmission.

80. The communication device of claim 79, wherein, The processing unit is further configured to determine the third chip length from the plurality of chip lengths. The transceiver is further configured to receive the Msg 1 transmitted by the first device, the Msg 1 carrying information of a plurality of chip lengths supported by the first device. The processing unit is configured to determine the third chip length from the plurality of chip lengths.

81. The communication device of any one of claims 78 to 80, wherein, The fourth information comprises one or more of: a preamble of the PRDCH; a termination symbol of the PRDCH; a last chip or chips of the PRDCH; the PRDCH as a whole.

82. The communication device of any one of claims 78 to 81, wherein, The second frequency offset comprises a third offset value, the third offset value being used to determine a fourth chip length used to transmit other messages after the Msg 1.

83. The communication device of claim 82, wherein, The processing unit is further configured to determine the third offset value from the plurality of offset values. The transceiver is further configured to: transmit a PRDCH to the first device, information of the third chip length and / or the second frequency offset being carried in the PRDCH.

84. The communication device of any one of claims 78 to 83, wherein, The first device supports a single sideband modulation, the modulation mode comprising an upper sideband modulation mode and / or a lower sideband modulation mode. The modulation mode is applied to other messages after the Msg 1.

85. The communication device of any one of claims 70 to 84, wherein, The transceiver is further configured to:

86. The communication device of any one of claims 70 to 85, wherein, transmit a PRDCH to the first device, information of the modulation mode being carried in the PRDCH.

87. The communication device of any one of claims 70 to 86, wherein, 88. The communication device of any one of claims 70 to 87, The first device is an ambient Internet of Things (A-IoT) device, and the second device is a reader; and / or The D2R transmission is an active transmission based D2R transmission. A chip, comprising a transceiver, a memory, and a processor, the memory being configured to store a program, and the processor being configured to invoke the program in the memory and control the transceiver to receive or transmit signals, so that the communication device performs the method according to any one of claims 1 to 25. A chip, comprising a transceiver, a memory, and a processor, the memory being configured to store a program, and the processor being configured to invoke the program in the memory and control the transceiver to receive or transmit signals, so that the communication device performs the method according to any one of claims 26 to 44.

89. A communications device, characterized by A chip, comprising a processor configured to invoke a program from a memory, so that the apparatus performs the method according to any one of claims 1 to 14.

90. A communications device, comprising: A chip, comprising a processor configured to invoke a program from a memory, so that the apparatus performs the method according to any one of claims 1 to 44.

91. An apparatus, comprising: A computer program product, having a program stored thereon, the program causing a computer to perform the method according to any one of claims 1 to 44.

92. A chip, comprising: ​ 93. A computer-readable storage medium, characterized in that, ​ 94. A computer program product, characterized in that, comprising a program causing a computer to perform the method according to any one of claims 1 to 44.

95. A computer program characterised in that, The computer program causes a computer to perform the method according to any one of claims 1 to 44.

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