Wireless communication methods and apparatuses, and device and storage medium

Abstract

Wireless communication methods and apparatuses, and a device and a storage medium, which relate to the technical field of communications. A wireless communication method, executed by a first device, comprises: sending a first channel, wherein the first channel is a channel used for R2D transmission, and the chip length of the R2D transmission is different from the chip length of D2R transmission (1110). Since the chip length of R2D transmission is different from the chip length of D2R transmission, after receiving a high level, a second device can determine, on the basis of a chip length corresponding to the high level, whether the high level belongs to the R2D transmission or the D2R transmission, without concern that the second device may detect the high level of the D2R transmission as a start bit of the R2D transmission, thereby avoiding erroneous detection of a start indication portion of the R2D transmission by the second device.

Description

Wireless communication methods, apparatus, devices and storage media Technical Field

[0001] This application relates to the field of communication technology, and in particular to a wireless communication method, apparatus, device, and storage medium. Background Technology

[0002] R2D (Reader to Device) transmission start indication information includes high and low levels, with a high level as the starting point. A-IoT (Ambient Internet of Things) devices determine whether it is R2D (Device to Reader) transmission start indication information based on detecting the high and low levels and their duration. However, if the last codeword of D2R transmission is a high level, and there is no subsequent D2R or R2D transmission, which corresponds to a low level, the A-IoT device will detect the last high level of D2R transmission and the low level without data transmission as the start indication information of R2D transmission, which will lead to false detection.

[0003] Summary of the Invention

[0004] This application provides a wireless communication method, apparatus, device, and storage medium. The technical solutions provided by this application are as follows:

[0005] According to one aspect of the embodiments of this application, a wireless communication method is provided, the method being performed by a first device, the method comprising:

[0006] A first channel is transmitted, which is the channel used for R2D transmission, and the chip length of the R2D transmission is different from that of the D2R transmission.

[0007] According to one aspect of the embodiments of this application, a wireless communication method is provided, the method being performed by a second device, the method comprising:

[0008] Receive a first channel, which is a channel used for R2D transmission, wherein the chip length of the R2D transmission is different from the chip length of the D2R transmission.

[0009] According to one aspect of the embodiments of this application, a wireless communication device is provided, the device comprising:

[0010] The transmitting module is used to transmit a first channel, which is a channel used for R2D transmission, and the chip length of the R2D transmission is different from that of the D2R transmission.

[0011] According to one aspect of the embodiments of this application, a wireless communication device is provided, the device comprising:

[0012] A receiving module is used to receive a first channel, which is a channel used for R2D transmission, and the chip length of the R2D transmission is different from that of the D2R transmission.

[0013] According to one aspect of the embodiments of this application, a communication device is provided, the communication device including a processor and a memory, the memory storing a computer program, and the processor executing the computer program to implement the above-described wireless communication method.

[0014] According to one aspect of the embodiments of this application, a computer-readable storage medium is provided, wherein the storage medium stores a computer program for execution by a processor to implement the above-described wireless communication method.

[0015] According to one aspect of the embodiments of this application, a chip is provided, the chip including programmable logic circuits and / or program instructions, which, when the chip is running, are used to implement the above-described wireless communication method.

[0016] According to one aspect of the embodiments of this application, a computer program product is provided, the computer program product including computer instructions stored in a computer-readable storage medium, and a processor reading from the computer-readable storage medium and executing the computer instructions to implement the above-described wireless communication method.

[0017] The technical solutions provided in this application embodiment may have the following beneficial effects:

[0018] The chip length for R2D transmission is different from that for D2R transmission. After receiving a high level, the second device can determine whether the high level belongs to R2D transmission or D2R transmission based on the chip length corresponding to the high level. There is no need to worry that the second device will detect the high level of D2R transmission as the start bit of R2D transmission, thus avoiding false detection of the start indication part of R2D transmission by the second device. Attached Figure Description

[0019] Figure 1 is a schematic diagram of a network architecture provided in one embodiment of this application;

[0020] Figure 2 is a schematic diagram of an environmental Internet of Things (IoT) communication system provided in an embodiment of this application;

[0021] Figure 3 is a schematic diagram of the radio frequency energy harvesting principle provided in an embodiment of this application;

[0022] Figure 4 is a schematic diagram of the backscatter communication principle provided in an embodiment of this application;

[0023] Figure 5 is a schematic diagram of the principle of resistive load modulation provided in one embodiment of this application;

[0024] Figure 6 is a schematic diagram of bidirectional communication between an A-IoT device and a base station according to an embodiment of this application;

[0025] Figure 7 is a schematic diagram of bidirectional communication between an A-IoT device and an intermediate node according to an embodiment of this application;

[0026] Figure 8 is a schematic diagram of the structure of R2D transmission provided in an embodiment of this application;

[0027] Figure 9 is a schematic diagram of the structure of D2R transmission provided in an embodiment of this application;

[0028] Figure 10 is a schematic diagram of a false detection provided in an embodiment of this application;

[0029] Figure 11 is a flowchart of a wireless communication method provided in an embodiment of this application;

[0030] Figure 12 is a schematic diagram of a wireless communication method provided in an embodiment of this application;

[0031] Figure 13 is a block diagram of a wireless communication device provided in an embodiment of this application;

[0032] Figure 14 is a block diagram of a wireless communication device provided in another embodiment of this application;

[0033] Figure 15 is a schematic diagram of the structure of a communication device provided in an embodiment of this application. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0035] The network architecture and business scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0036] The technical solutions of this application embodiment can be applied to various communication systems, such as: Global System for Mobile Communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, New Radio (NR) system, evolution of NR system, LTE-based access to unlicensed spectrum (LTE-U) system, NR-based access to unlicensed spectrum (NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), and Wireless Fidelity (WF). Fidelity (WiFi), 5th-Generation (5G) systems, B5G (Beyound 5G) systems, 6th-Generation (6G) systems, or other communication systems.

[0037] Traditional communication systems typically support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communication but also, for example, device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), vehicle-to-vehicle (V2V) communication, or vehicle-to-everything (V2X) communication. The embodiments of this application can also be applied to these communication systems.

[0038] The communication system in this application embodiment can be applied to carrier aggregation (CA) scenarios, dual connectivity (DC) scenarios, and standalone (SA) network deployment scenarios.

[0039] The communication system in this application embodiment can be applied to unlicensed spectrum, wherein unlicensed spectrum can also be considered as shared spectrum; or, the communication system in this application embodiment can also be applied to licensed spectrum, wherein licensed spectrum can also be considered as non-shared spectrum.

[0040] The embodiments of this application can be applied to both non-terrestrial networks (NTN) and terrestrial networks (TN). NTN typically uses satellite communication to provide communication services to terrestrial users. Currently, NTN systems include NR-NTN and IoT-NTN systems, and other NTN systems may be included in the future.

[0041] Please refer to Figure 1, which shows a schematic diagram of a network architecture 100 provided in one embodiment of this application. The network architecture 100 may include: a terminal device 10, an access network device 20, and a core network element 30.

[0042] Terminal device 10 can refer to UE (User Equipment), access terminal equipment, user unit, user station, mobile station, mobile station, remote station, remote terminal equipment, mobile device, wireless communication equipment, user agent, or user device. In some embodiments, terminal device 10 can also be a cellular phone, cordless phone, SIP (Session Initiation Protocol) phone, WLL (Wireless Local Loop) station, PDA (Personal Digital Assistant), handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, vehicle-mounted device, wearable device, terminal device in 5GS (5th Generation System), or terminal device in the future evolved PLMN (Public Land Mobile Network), etc., and this application embodiment is not limited to these. For ease of description, the devices mentioned above are collectively referred to as terminal devices. The number of terminal devices 10 is usually multiple, and one or more terminal devices 10 can be distributed within the cell managed by each access network device 20. The term "terminal device" can also be abbreviated as "terminal device" or "UE," and those skilled in the art will understand its meaning.

[0043] Access network device 20 is a device deployed in an access network to provide wireless communication functionality to terminal device 10. Access network device 20 may include various forms of macro base stations, micro base stations, relay stations, access points, etc. In systems employing different wireless access technologies, the name of the device with access network device functionality may differ; for example, in a 5G NR system, it is called gNodeB or gNB. As communication technologies evolve, the name "access network device" may change. For ease of description, in this embodiment, the aforementioned devices providing wireless communication functionality to terminal device 10 are collectively referred to as access network devices. In some embodiments, a communication relationship can be established between terminal device 10 and core network element 30 through access network device 20. For example, in an LTE (Long Term Evolution) system, access network device 20 may be one or more eNodeBs in an EUTRAN (Evolved Universal Terrestrial Radio Access Network) or EUTRAN; in a 5G NR system, access network device 20 may be one or more gNBs in a RAN (Radio Access Network). In the embodiments of this application, unless otherwise specified, the term "network device" refers to access network device 20, such as a base station.

[0044] Core network element 30 is a network element deployed in the core network. Its main functions are to provide user connectivity, manage users, and bear services, acting as an interface to external network devices. For example, core network elements in a 5G NR system may include AMF (Access and Mobility Management Function) entities, UPF (User Plane Function) entities, and SMF (Session Management Function) entities.

[0045] In some embodiments, the access network device 20 and the core network element 30 communicate with each other via some air interface technology, such as the NG interface in a 5G NR system. The access network device 20 and the terminal device 10 communicate with each other via some air interface technology, such as the Uu interface.

[0046] The "5G NR system" in this application embodiment can also be referred to as a 5G system or an NR system, but those skilled in the art will understand its meaning. The technical solutions described in this application embodiment can be applied to LTE systems, 5G NR systems, and subsequent evolution systems of 5G NR systems (such as B5G (Beyound 5G) systems, 6G systems (6th Generation System), and other communication systems such as NB-IoT (Narrow Band Internet of Things) systems. This application does not limit these applications.

[0047] In this embodiment, the network device can provide services to a cell. The terminal device communicates with the network device through the transmission resources (e.g., frequency domain resources, or spectrum resources) on the carrier used by the cell. The cell can be the cell corresponding to the network device (e.g., a base station). The cell can belong to a macro base station or to a base station corresponding to a small cell. The small cell can include: metro cell, micro cell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-speed data transmission services.

[0048] Before introducing the technical solution of this application, the relevant technologies involved in this application will be described first. The following relevant technologies are optional solutions and can be arbitrarily combined with the technical solutions of the embodiments of this application, all of which fall within the protection scope of the embodiments of this application. The embodiments of this application include at least some of the following contents.

[0049] I. Communication Principles of Environmental Internet of Things

[0050] Ambient IoT (A-IoT) communication employs energy harvesting and backscatter communication technologies. A-IoT devices are IoT devices powered by various environmental energy sources, such as radio frequency energy, light energy, solar energy, thermal energy, and mechanical energy. These devices may have no energy storage capacity or very limited energy storage capacity (e.g., using capacitors with a capacitance of tens of microfarads (µF)). Compared to existing IoT devices, A-IoT devices offer numerous advantages, including no need for conventional batteries, no maintenance, small size, low complexity and low cost, and long lifespan.

[0051] The Environmental Internet of Things (IoT) consists of network devices and A-IoT devices, as shown in Figure 2. The network devices are used to send wireless power signals and downlink communication signals to the A-IoT devices, and to receive backscattered signals from the A-IoT devices. A basic A-IoT device includes an energy harvesting module, a backscattered communication module, and a low-power computing module. In addition, A-IoT devices may also have a memory or sensor to store basic information (such as object identification) or acquire sensor data such as ambient temperature and humidity.

[0052] In the embodiments of this application, the A-IoT system can also be called a zero-power system, and the A-IoT device can also be called a zero-power device.

[0053] Key technologies for the Internet of Things (IoT) in the environment mainly include radio frequency energy harvesting and backscatter communication.

[0054] 1. Radio Frequency Power Harvesting

[0055] As shown in Figure 3, the radio frequency energy harvesting module harvests electromagnetic wave energy from space based on the principle of electromagnetic induction, thereby obtaining the energy required to drive A-IoT devices, such as low-power demodulation and modulation modules, sensors, and memory access. Therefore, A-IoT devices do not require traditional batteries.

[0056] 2. Backscattering communication

[0057] As shown in Figure 4, the environmental IoT communication terminal receives wireless signals sent by the network, modulates the wireless signals, loads the information to be transmitted, 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 A-IoT device's oscillation circuit according to the data stream's rhythm, causing parameters such as the electronic tag's impedance to change accordingly, thus completing the modulation process. Load modulation technology mainly includes two methods: resistive load modulation and capacitive load modulation. In resistive load modulation, a resistor is connected in parallel with the load. This resistor is switched on or off based on the control of the binary data stream, as shown in Figure 5. The switching on and off of the resistor causes changes in the circuit voltage, thus achieving amplitude shift keying (ASK), that is, signal modulation and transmission are achieved by adjusting the amplitude of the A-IoT device's backscatter signal. Similarly, in capacitive load modulation, the circuit resonant frequency can be changed by switching the capacitor on and off, realizing frequency shift keying (FSK). That is, the signal is modulated and transmitted by adjusting the operating frequency of the backscattered signal of the A-IoT device.

[0058] As can be seen, A-IoT devices utilize load modulation to modulate the incoming signal, thereby achieving backscatter communication. Therefore, A-IoT devices have significant advantages:

[0059] (1) The terminal does not actively transmit signals, so it does not need complex radio frequency links, such as PA (Power Amplifier), radio frequency filters, etc.;

[0060] (2) The terminal does not need to actively generate high-frequency signals, therefore it does not need a high-frequency crystal oscillator;

[0061] (3) With the help of backscatter communication, the terminal signal transmission does not require the terminal's own energy to be consumed.

[0062] II. Classification of A-IoT Devices

[0063] Based on their energy sources and usage patterns, A-IoT devices can be categorized as follows:

[0064] 1) Passive A-IoT devices

[0065] A-IoT devices do not require internal batteries. When an A-IoT device approaches a network device (such as a reader in an RFID (Radio Frequency Identification) system), it falls within the near-field range of the network device's antenna radiation. Therefore, the A-IoT device's antenna generates an induced current through electromagnetic induction, which drives the device's low-power chip circuitry. This circuitry demodulates the forward link signal (downlink, from the network device to the A-IoT device) and modulates the backward link signal (uplink, from the A-IoT device to the network device). For the backscatter link, the A-IoT device uses backscattering to transmit signals.

[0066] It can be seen that passive A-IoT devices do not require built-in batteries to drive either the forward or reverse links, making them true A-IoT devices.

[0067] Passive A-IoT devices do not require batteries, and their radio frequency and baseband circuits are very simple. For example, they do not require LNA (Low Noise Amplifier), PA (Power Amplifier), crystal oscillator, ADC (Analog to Digital Converter), etc. Therefore, they have many advantages such as small size, light weight, very low price, and long service life.

[0068] 2) Semi-passive A-IoT devices

[0069] Semi-passive A-IoT devices do not have conventional batteries installed, but they can harvest energy using RF energy harvesting modules or solar / photovoltaic / thermal / kinetic energy harvesting modules, storing the harvested energy in an energy storage unit (such as a capacitor). Once the energy storage unit receives energy, it can drive the low-power chip circuitry of the A-IoT device, enabling demodulation of forward link signals and modulation of backward link signals. For backscatter links, A-IoT devices use backscattering to transmit signals.

[0070] It can be seen that semi-passive A-IoT devices do not require built-in batteries to drive either the forward or reverse links. Although they use energy stored in capacitors during operation, the energy comes from the radio energy collected by the energy harvesting module, thus making them a true A-IoT device.

[0071] Semi-passive A-IoT devices inherit many advantages from passive A-IoT devices, and therefore have many advantages such as small size, light weight, very low price, and long service life.

[0072] 3) Active A-IoT devices

[0073] In some scenarios, A-IoT devices can also be active A-IoT devices. These terminals can have built-in batteries (conventional batteries, such as dry cell batteries, rechargeable lithium batteries, etc.). The battery powers the low-power chip circuitry of the A-IoT device, enabling demodulation of the forward link signal and modulation of the backward link signal. However, for the backscatter link, the A-IoT device uses backscattering to transmit signals. Therefore, the zero power consumption of this type of terminal is mainly reflected in the fact that the signal transmission of the backward link does not require the terminal's own power, but uses backscattering. Although active A-IoT devices use batteries, their power consumption is extremely low due to ultra-low power communication technology, thus significantly improving battery life compared to existing technologies.

[0074] Active A-IoT devices are powered by built-in batteries, increasing the tag's read / write distance and improving communication reliability. Therefore, they are used in scenarios with relatively high requirements for communication distance and read latency.

[0075] A-IoT devices include the following types:

[0076] First device type: with a peak power consumption of approximately 1 microwatt (~1 μW), energy storage capability, and an initial sampling frequency offset (SFO) of up to 10. X ppm (parts per million), without either a downlink amplifier or an uplink amplifier, performs uplink transmission through backscattering of the carrier wave. (Device 1: ~1μW peak power consumption, has energy storage, initial sampling frequency offset (SFO) up to 10) X ppm,neither DL nor UL amplification in the device.The device's UL transmission is backscattered on a carrier wave provided externally).

[0077] Second device type: with peak power consumption of less than or equal to several hundred microwatts (≤ a few hundred μW), energy storage capability, and initial sampling frequency offset (SFO) of up to 10.X ppm (parts per million), with downlink amplifiers and / or uplink amplifiers, uplink transmission via backscatter of the carrier wave (Device 2a: ≤ a few hundred μW peak power consumption, has energy storage, initial sampling frequency offset (SFO) up to 10). X ppm, both DL and / or UL amplification in the device.The device's UL transmission is backscattered on a carrier wave provided externally).

[0078] The third device type: has a peak power consumption of less than or equal to several hundred microwatts (μW), has energy storage capabilities, and an initial sampling frequency offset (SFO) of up to 10. X ppm (parts per million), with downlink amplifiers and / or uplink amplifiers, uplink transmission is generated internally, also known as active transmission. (Device 2b: ≤ a few hundred μW peak power consumption, has energy storage, initial sampling frequency offset (SFO) up to 10) X ppm, both DL and / or UL amplification in the device.The device's UL transmission is generated internally by the device).

[0079] For different types of A-IoT devices, the corresponding sampling frequency deviation values ​​can be the same or different. For example, for the first device type, X = 5 or 4; for the second device type, X = 4 or 3; and for the third device type, X = 4 or 3.

[0080] III. Low-Power Internet of Things Based on Cellular Networks

[0081] Cellular IoT is booming. For example, 3GPP has standardized IoT technologies such as Narrow Band Internet of Things (NB-IoT), Machine Type Communication (MTC), and Reduced Capability (RedCap). However, there are still many IoT communication needs in various scenarios that cannot be met by existing technologies. These include harsh communication environments (high temperature, extremely low temperature, high humidity, high pressure, high radiation, or high speed movement, etc.), the need for extremely small terminal form factors, and extremely low cost.

[0082] Therefore, in order to cover these unmet IoT communication needs, ultra-low cost, extremely small size, battery-free / maintenance-free IoT also needs to be developed in cellular networks, and environmental IoT can meet this need.

[0083] Based on the discussion of A-IoT application scenarios according to the 3GPP System Architecture (SA) 1, A-IoT can be used in at least the following four types of scenarios:

[0084] • Object recognition, such as logistics, production line product management, and supply chain management.

[0085] • Environmental monitoring, such as monitoring of temperature, humidity, and harmful gases in the work environment and natural environment.

[0086] • Positioning, such as indoor positioning, intelligent item finding, and production line item positioning.

[0087] • Intelligent control, such as the intelligent control of various electrical appliances in smart homes (turning on and off air conditioners, adjusting temperature), and the intelligent control of various facilities in agricultural greenhouses (automatic irrigation, fertilization).

[0088] In low-power IoT based on cellular networks, A-IoT devices can directly transmit and receive carrier waves, data, or signals from the base station, and send or backscatter data or channels to the base station, as shown in Figure 6 (denoted as the first topology). Alternatively, communication between the A-IoT device and the base station can be achieved through an intermediate node. In this case, the intermediate node sends a carrier wave, data, or signal to the A-IoT device, and the A-IoT device sends or backscatters data or signals to the intermediate node, as shown in Figure 7 (denoted as the second topology). The intermediate node can be a terminal device, a base station device, or an IAB (Integrated Access and Backhaul) node. The base station in Figure 6 and the intermediate node in Figure 7 can be collectively referred to as a reader.

[0089] As shown in Figure 6 or Figure 7, A-IoT devices can communicate directly with base station devices or through intermediate nodes. In both Figures 6 and 7, A-IoT transmission is based on network device scheduling. In Figure 6, the A-IoT device communicates directly with the base station, so the network device can directly send scheduling information to the A-IoT device. In Figure 7, the A-IoT device communicates with the base station through an intermediate node. The scheduling information sent by the base station is first sent to the intermediate node, and then the intermediate node sends it to the A-IoT device. In both topologies, the base station in the first topology and the intermediate UE in the second topology are called readers, and the A-IoT device can be called a device. Transmission from reader to device is called R2D transmission, and transmission from device to reader is called D2R transmission.

[0090] As shown in Figure 8, the structure of R2D transmission can include the following parts:

[0091] ● Preamble: Used to indicate the start position in the time domain of R2D transmission, and / or for A-IoT devices to obtain time synchronization or frequency synchronization information; specifically, the preamble may include the following two parts (the preamble part may also include other parts, as specified in this application).

[0092] (The embodiments are not limited):

[0093] ■ Start-indicator: Used to indicate the start position in the time domain of R2D transmission; includes a pattern consisting of high and low levels, or a predefined sequence;

[0094] ■ Synchronization information: used by A-IoT devices to obtain time synchronization or frequency synchronization, and / or to indicate chip length or chip duration; wherein, frequency synchronization includes, for example, sampling frequency synchronization and carrier frequency synchronization.

[0095] ● Data and / or control information: This includes data and / or control information sent by the reader to the device. Data and control information can be carried on the same channel (e.g., PRDCH, Physical Reader to Device Channel). For example, control information can be carried via MAC CE and then carried together with data via the PRDCH channel; alternatively, data and control information can be carried on different channels; or, data information can be carried via a channel (e.g., PRDCH), and control information can be transmitted before the channel carrying the data; or, data information can be carried via a channel (e.g., PRDCH), and control information can be multiplexed within the channel carrying the data. Control and data information can use different Cyclic Redundancy Check (CRC) codes, or control and data information can be processed together with CRC codes.

[0096] ● Postamble: Used to determine the end position of the R2D transmission. This part is optional, meaning that the R2D transmission may or may not include a postamble.

[0097] As shown in Figure 9, the structure of D2R transmission can include the following parts:

[0098] ● Preamble: Used to indicate the start position of D2R transmission in the time domain; the base station determines whether there is D2R transmission based on the detection of the D2R preamble.

[0099] ●Mideamble: An intermediate code is inserted into the PDRCH (Physical Device to Reader Channel) transmission. The base station uses the intermediate code to perform channel estimation, frequency estimation, etc. This part is optional, that is, the D2R transmission may or may not include the mideamble.

[0100] ● Postamble: Used to determine the end position of D2R transmission. This part is optional, that is, R2D transmission may or may not include a postamble.

[0101] ●Data and / or control information: Carried via PDRCH.

[0102] As shown in Figure 10, the start indication information of R2D transmission includes high and low levels. The terminal device determines whether it is the start indication information of R2D transmission based on the detection of high and low levels and their duration. However, if the last codeword of D2R transmission is high level, and there is no subsequent D2R transmission or R2D transmission, which corresponds to a low level, the device will detect the last high level of D2R transmission and the low level without data transmission as the start indication information of R2D transmission, which will lead to false detection.

[0103] Please refer to Figure 11, which shows a flowchart of a wireless communication method provided in an embodiment of this application. The method is performed by a first device, which includes the following step 1110.

[0104] Step 1110: The first device sends a first channel, which is the channel used for R2D transmission. The chip length for R2D transmission is different from the chip length for D2R transmission. Correspondingly, the second device receives the first channel.

[0105] In some embodiments, the first device is a reader and the second device is an A-IoT device. In some embodiments, the first channel is the channel used by the reader to send data to the A-IoT device. In some embodiments, the first channel may be referred to as PRDCH.

[0106] In some embodiments, the chip length of the R2D transmission is the chip length corresponding to the PRDCH, or the length corresponding to the high level of the start indication information in the R2D transmission, or the length corresponding to the low level of the start indication information in the R2D transmission.

[0107] In some embodiments, the chip length of the D2R transmission is the chip length corresponding to the PDRCH, or the chip length corresponding to the post-synchronization signal in the D2R transmission.

[0108] A data signal (such as information bits including 1s or 0s) is encoded and modulated; the modulated signal is called a chip. Chip length refers to the length of a chip. In some embodiments, the encoding method includes one or more of the following: convolutional codes; Manchester codes; pulse interval encoding (PIE); bi-phase space coding; Miller coding. In some embodiments, the modulation method includes one or more of the following: on-off keying (OOK) modulation; phase shift keying (PSK) modulation; binary phase shift keying (BPSK) modulation; frequency shift keying (FSK) modulation; orthogonal frequency division multiplexing (OFDM) modulation.

[0109] Regarding how the first device determines the chip length for R2D transmission

[0110] In some embodiments, the chip length of the R2D transmission includes the chip length corresponding to the PRDCH, or the length corresponding to the high level of the start indication information in the R2D transmission, or the length corresponding to the low level of the start indication information in the R2D transmission.

[0111] In some embodiments, a first channel is associated with first indication information, and the chip length corresponding to R2D transmission or PRDCH is determined based on the first indication information. In some embodiments, the first channel is used to carry first information, which includes the first indication information. In some embodiments, the preamble portion associated with the first channel carries the first indication information. In some embodiments, the first channel is used to carry first information, which is associated with a preamble portion that carries the first indication information. In some embodiments, all information transmitted in the first channel is associated with a preamble portion. In some embodiments, the first indication information carried by the preamble portion associated with the information transmitted in the first channel is the same.

[0112] In some embodiments, the first indication information is used to indicate the chip length of the R2D transmission or the chip length corresponding to the PRDCH. The first device can determine the chip length of the R2D transmission or the chip length corresponding to the PRDCH based on the first indication information. In some embodiments, the first indication information corresponds to a sequence of one high level and one low level in sequence. In some embodiments, the first indication information corresponds to a sequence of multiple high levels and multiple low levels in sequence, wherein the lengths corresponding to the multiple high levels are the same, or the lengths corresponding to the multiple high levels are not completely the same; the lengths corresponding to the multiple low levels are the same, or the lengths corresponding to the multiple low levels are not completely the same; the lengths corresponding to the high levels are the same as the lengths corresponding to the low levels, or the lengths corresponding to the high levels are not completely the same as the lengths corresponding to the low levels. In one example, the duration of the high level corresponding to the first indication information is determined based on the chip length of the R2D transmission or the chip length corresponding to the PRDCH. Exemplarily, the duration of the high level corresponding to the first indication information is equal to the chip length corresponding to the PRDCH. Exemplarily, the duration of the high level after encoding the first indication information is N times the chip length corresponding to the PRDCH, where N is a positive number. For example, the chip length corresponding to PRDCH is N times the duration of the high level after encoding the first indication information, where N is a positive number. Therefore, the first device can determine the chip length of R2D transmission or the chip length corresponding to PRDCH based on the duration of the high level after encoding the first indication information. In another example, the duration of the low level after encoding the first indication information is determined based on the chip length of R2D transmission or the chip length corresponding to PRDCH. For example, the duration of the low level after encoding the first indication information is equal to the chip length corresponding to PRDCH. For example, the duration of the low level after encoding the first indication information is N times the chip length corresponding to PRDCH, where N is a positive number. For example, the chip length corresponding to PRDCH is N times the duration of the low level after encoding the first indication information, where N is a positive number. Therefore, the first device can determine the chip length of R2D transmission or the chip length corresponding to PRDCH based on the duration of the low level after encoding the first indication information. In some embodiments, N is predefined or preconfigured.

[0113] In some embodiments, the first indication information is the start indication information of the preamble associated with the first information. For example, as shown in FIG8, the first indication information is the start indication information shown in FIG8, the first information is the R2D transmission shown in FIG8, and all or part of the information in the first information is carried in a first channel, which is a PRDCH. For example, the data information included in the R2D transmission is carried in the PRDCH. Another example is that the data information and control information included in the R2D transmission are carried in the PRDCH. For example, the start indication information of the R2D transmission is used to indicate the chip length corresponding to the PRDCH channel. In some embodiments, the duration of the high or low level corresponding to the start indication information is equal to the length of the chip corresponding to the PRDCH transmission, or the duration of the high or low level corresponding to the start indication information is determined based on the length of the chip corresponding to the PRDCH transmission, or the length of the chip corresponding to the PRDCH transmission is determined based on the duration of the high or low level corresponding to the start indication information.

[0114] In some embodiments, the first indication information is the synchronization information of the preamble associated with the first information. For example, as shown in FIG8, the first indication information is the synchronization information shown in FIG8, the first information is the R2D transmission shown in FIG8, and all or part of the information in the first information is carried in a first channel, which is a PRDCH. For example, the data information included in the R2D transmission is carried in the PRDCH. Another example is that the data information and control information included in the R2D transmission are carried in the PRDCH. For example, the synchronization information of the R2D transmission is used to indicate the chip length corresponding to the PRDCH channel. In some embodiments, the duration of the high or low level corresponding to the synchronization information is equal to the length of the chip corresponding to the PRDCH transmission, or the duration of the high or low level corresponding to the synchronization information is determined based on the length of the chip corresponding to the PRDCH transmission, or the length of the chip corresponding to the PRDCH transmission is determined based on the duration of the high or low level corresponding to the synchronization information.

[0115] In some embodiments, the chip length of the R2D transmission is the length corresponding to either a high level or a low level of the start indication information included in the R2D transmission. The length corresponding to either a high level or a low level of the start indication information in the R2D transmission is determined based on protocol predefined information, preconfiguration information, or network configuration information. For example, the protocol predefined the structure or pattern corresponding to the preamble of the R2D transmission, and the length corresponding to either a high or low level of the start indication information is determined based on the protocol predefined information.

[0116] How is the chip length determined for R2D transmission?

[0117] In some embodiments, the chip length of the R2D transmission or the chip length corresponding to the PRDCH is determined based on the modulation scheme of the first channel.

[0118] In some embodiments, R2D transmission supports OOK-1 and OOK-4 modulation schemes, with different chip lengths corresponding to different modulation schemes. In one example, the modulation scheme of the first channel is OOK-1 modulation, and the chip length of the R2D transmission or the chip length corresponding to the PRDCH is equal to the length of one OFDM symbol. In another example, the modulation scheme of the first channel is OOK-4 modulation, and the chip length of the R2D transmission is determined based on the length of one OFDM symbol and a first value, where the first value is the number of chips corresponding to one OFDM symbol. In some embodiments, the first value is predefined or pre-configured. In some embodiments, the first value is configured by the network device for the first device.

[0119] In some embodiments, the length of an OFDM symbol is related to the subcarrier spacing. In other embodiments, the length of an OFDM symbol is related to the reciprocal of the subcarrier spacing. The length of OFDM symbols varies with different subcarrier spacings. The modulation principle of OOK (Optical Amplitude Shift Keying) is used to control one amplitude to be 0 and another amplitude to be non-zero; this is OOK. Also known as Binary Amplitude Shift Keying (2ASK), it uses a unipolar non-return-to-zero code sequence to control the on / off state of a sinusoidal carrier. OOK-1 is an OOK scheme where each OFDM symbol transmits 1 bit of information. OOK-4 is another OOK scheme where each OFDM symbol can transmit M bits of information, where M is a first value.

[0120] In some embodiments, R2D transmission may also support other OOK modulation schemes, such as OOK-2 and OOK-3. In some embodiments, if R2D transmission supports other OOK modulation schemes, the method for determining the chip length corresponding to different modulation schemes is also different. This application embodiment uses OOK-1 and OOK-4 modulation schemes as examples for illustrative purposes.

[0121] For example, the modulation scheme of the first channel is OOK-1 modulation, where one OFDM symbol corresponds to one chip, and the length of one chip is equal to the length of one OFDM symbol. For example, the modulation scheme of the first channel is OOK-4 modulation, where one OFDM symbol corresponds to M chips, and the length of one chip is determined based on the length of one OFDM symbol, for example, T. chip =T OFDM / M. Where T OFDM Based on the length of an OFDM symbol, T chipThis refers to the length of a chip, i.e., the chip length. In some embodiments, the length of an OFDM symbol, i.e., the duration of an OFDM symbol, includes the duration of the cyclic prefix. The cyclic prefix (CP) is constructed by copying the signal from the tail of the OFDM symbol to the head. There are two main types of CP lengths: normal cyclic prefix and extended cyclic prefix. In some embodiments, the normal cyclic prefix length is 4.7 μs, and the extended cyclic prefix length is 16.67 μs. The cyclic prefix can be correlated with other multipath component information to obtain complete information. In addition, the cyclic prefix can achieve time pre-estimation and frequency synchronization.

[0122] Regarding the chip length of D2R transmission

[0123] In some embodiments, the chip length of the D2R transmission is the chip length corresponding to the PDRCH, or the chip length corresponding to the post-synchronization signal in the D2R transmission.

[0124] In some embodiments, the chip length for D2R transmission is predefined or preconfigured, or the chip length for D2R transmission is determined by the network device's configuration information. In some embodiments, the chip length for R2D transmission differs from the chip length for D2R transmission. For example, the chip length for R2D transmission is shorter than the chip length for D2R transmission. For example, the chip length for R2D transmission is longer than the chip length for D2R transmission.

[0125] In some embodiments, the first indication information includes a high level and a low level, and starting with a high level, if the chip length of the R2D transmission is different from the chip length of the D2R transmission, then the A-IoT device will not detect the chip transmitted by D2R as the chip transmitted by R2D, and thus will not cause the false detection mentioned in the above embodiments.

[0126] The technical solution provided in this application embodiment has a different chip length for R2D transmission than for D2R transmission. After receiving a high level, the second device can determine whether the high level belongs to R2D transmission or D2R transmission based on the chip length corresponding to the high level. There is no need to worry that the second device will detect the high level of D2R transmission as the start bit of R2D transmission, thereby avoiding the second device's false detection of the start indication part of R2D transmission.

[0127] This application also provides a wireless communication method, which is performed by a second device. The method includes the following step a.

[0128] Step a: The second device receives the first channel, which is the channel used for R2D transmission. The chip length for R2D transmission is different from the chip length for D2R transmission. Accordingly, the first device transmits the first channel.

[0129] For details regarding step a, please refer to the description of step 1110 in the above embodiments; this application will not repeat them here.

[0130] The technical solution provided in this application embodiment has a different chip length for R2D transmission than for D2R transmission. After receiving a high level, the second device can determine whether the high level belongs to R2D transmission or D2R transmission based on the chip length corresponding to the high level. There is no need to worry that the second device will detect the high level of D2R transmission as the start bit of R2D transmission, thereby avoiding the second device's false detection of the start indication part of R2D transmission.

[0131] The above embodiments mention that the chip length of R2D transmission is different from that of D2R transmission. This application also provides exemplary embodiments on how to set different chip lengths.

[0132] Example 1: The chip length for D2R transmission is greater than the chip length for R2D transmission.

[0133] In some embodiments, the chip length for D2R transmission is greater than the chip length for R2D transmission. Since the chip length for R2D transmission is determined based on the modulation scheme, the following situations may occur.

[0134] Case 1: The chip length for R2D transmission is either the length corresponding to the high level of the start indication information in R2D transmission, or the length corresponding to the low level of the start indication information in R2D transmission. The chip length for R2D transmission can be determined based on protocol predefined information or preconfiguration information. Case 2: The chip length for D2R transmission is greater than the length corresponding to the high level of the start indication information, or the chip length for D2R transmission is greater than the length corresponding to the low level of the start indication information.

[0135] In scenario 2, if the modulation scheme of the first channel is OOK-1 modulation, then the chip length of R2D transmission is equal to the length of one OFDM symbol, and the chip length of D2R transmission is greater than the length of one OFDM symbol.

[0136] In scenario 3, if the modulation scheme of the first channel is OOK-4 modulation, then the chip length for R2D transmission is determined based on the length of an OFDM symbol and a first value. In some embodiments, the first value is predefined, pre-configured, or configured by the network device. There may be multiple candidate values ​​for the first value, and the resulting R2D transmission chip length will differ depending on the different candidate values. In other words, the R2D transmission chip length has at least one possible value. In some embodiments, the D2R transmission chip length is greater than the maximum value among at least one possible R2D transmission chip length values. For example, if the first value is 2, 4, or 8, the R2D transmission chip length is inversely proportional to the first value. That is, when the first value is 2, the R2D transmission chip length is the largest, and the D2R transmission chip length only needs to be greater than the R2D chip length corresponding to the first value being 2.

[0137] For example, taking the R2D transmission structure shown in Figure 8 as an example, the first indication information corresponds to the start indication information shown in Figure 8. Since the start indication information of R2D transmission is used to indicate the chip length corresponding to PRDCH, the duration corresponding to the high level of the start indication information of R2D transmission is determined based on the chip length corresponding to PRDCH. For example, the duration corresponding to the high level of the start indication information of R2D transmission is equal to the chip length corresponding to PRDCH. In some embodiments, the chip length of D2R transmission is greater than the duration corresponding to the high level of the start indication information of R2D transmission. The second device can determine whether the chip corresponds to the start indication information part of D2R transmission or R2D transmission based on the detected chip length. In one example, since the chip length of R2D transmission is determined based on the parameter M (first value) of OOK-4, different M values ​​correspond to different chip lengths. In one embodiment, the chip length of D2R transmission is greater than the maximum chip length of R2D transmission. In one implementation, the network device sends configuration information indicating the M value supported by the R2D transmission of the A-IoT system (which includes a first device and a second device), for example, configuring M = 2, 4, 8; the maximum chip length of the R2D transmission is determined based on the minimum M value supported by the R2D transmission of the A-IoT system.

[0138] In some embodiments, the chip length for D2R transmission is P times the chip length for R2D transmission, where P is a positive number greater than 1. In some embodiments, the value of P is predefined, preconfigured, or configured by the network device. For example, the chip length for D2R transmission is equal to 1.5 times the chip length for R2D transmission. In one example, if the modulation scheme of the first channel is OOK-4 modulation, then the chip length for D2R transmission is P times the maximum value of the chip length for R2D transmission. For example, as shown in Figure 12, the chip length for D2R transmission is equal to 1.5 times the maximum value of the chip length for R2D transmission. D2R =1.5·T R2D T D2R T is the chip length for D2R transmission. R2D This represents the maximum chip length for R2D transmission. Because the chip lengths for D2R and R2D transmissions are different, A-IoT devices will not misdetect the last chip of a D2R transmission as the chip corresponding to the start indication portion of an R2D transmission.

[0139] Example 2: The ratio of the chip length of D2R transmission to the chip length of R2D transmission is within a first range.

[0140] In some embodiments, the chip length of the R2D transmission is the length corresponding to the high level of the start indication information in the R2D transmission, or the length corresponding to the low level of the start indication information in the R2D transmission. The chip length of the R2D transmission can be determined based on protocol predefined information or preconfiguration information. The ratio of the chip length of the D2R transmission to the length corresponding to the high level of the start indication information is within a first range, or the ratio of the chip length of the D2R transmission to the length corresponding to the low level of the start indication information is within a first range.

[0141] For the case where the modulation scheme of the first channel is OOK-1, since the chip length of R2D transmission can only be equal to the length of one OFDM symbol, it can be concluded that the chip length of D2R transmission is different from that of R2D transmission as long as the chip length of D2R transmission is not 1. Therefore, this case will not be discussed further here. The following explanation will use OOK-4 modulation scheme of the first channel as an example.

[0142] In some embodiments, the ratio of the chip length of D2R transmission to the chip length of R2D transmission is greater than a first threshold; and the ratio of the chip length of D2R transmission to the chip length of R2D transmission is less than a second threshold.

[0143] Let A represent the first threshold and B represent the second threshold, then the first range can be expressed as: Where T chip，D2R It is determined based on the chip length of D2R transmission, T chip，R2D It is determined based on the chip length of R2D transmission.

[0144] In some embodiments, the first threshold is less than or equal to the second threshold.

[0145] In some embodiments, the values ​​of the first threshold and the second threshold are associated with the first numerical value. In some embodiments, for each possible value of the first numerical value, there are corresponding first and second thresholds. The first numerical value is determined based on the number of chips corresponding to one OFDM symbol in OOK-4 modulation. For example, the first numerical value may be 2, 4, or 8. When the first numerical value is 2, the corresponding first and second thresholds are denoted as A1 and B1; when the first numerical value is 4, the corresponding first and second thresholds are denoted as A2 and B2; and when the first numerical value is 8, the corresponding first and second thresholds are denoted as A3 and B3.

[0146] In some embodiments, a first threshold is determined based on the maximum value of at least one of the chip lengths of R2D transmission, and the chip length of D2R transmission; a second threshold is determined based on the minimum value of at least one of the chip lengths of R2D transmission, and the chip length of D2R transmission. In some embodiments, the values ​​of the first threshold and the second threshold are related to a first value. In some embodiments, the value of the first threshold is determined based on the minimum value of the first value, and the value of the second threshold is determined based on the maximum value of the first value. The chip length of R2D transmission is determined based on the length of an OFDM symbol and the first value, where the first value is inversely proportional to the chip length of R2D transmission. For example, the first value may be 2, 4, or 8. When the first value is 2, the chip length of R2D transmission is the maximum, and the first threshold is determined based on this chip length; when the first value is 8, the chip length of R2D transmission is the minimum, and the second threshold is determined based on this chip length. It should be noted that in this case, the first value could also be 4. In this case, the ratio of the R2D chip length to the D2R transmission chip length falls within the first range formed by the first and second thresholds. Therefore, the D2R transmission chip length needs to be limited, and it differs from the R2D transmission chip length corresponding to the first value of 4. Thus, the aforementioned first range can be rewritten as... or

[0147] In some embodiments, the ratio of the chip length of D2R transmission to the chip length of R2D transmission is greater than or equal to a first threshold; or the ratio of the chip length of D2R transmission to the chip length of R2D transmission is less than or equal to a second threshold.

[0148] Let A represent the first threshold and B represent the second threshold, then the first range can be expressed as: or, Where T chip，D2R It is determined based on the chip length of D2R transmission, T chip，R2D It is determined based on the chip length of R2D transmission.

[0149] In some embodiments, the first threshold is less than or equal to the second threshold.

[0150] In some embodiments, the values ​​of the first threshold and the second threshold are associated with the first numerical value. In some embodiments, for each possible value of the first numerical value, there are corresponding first and second thresholds. The first numerical value is determined based on the number of chips corresponding to one OFDM symbol in OOK-4 modulation. For example, the first numerical value may be 2, 4, or 8. When the first numerical value is 2, the corresponding first and second thresholds are denoted as A1 and B1; when the first numerical value is 4, the corresponding first and second thresholds are denoted as A2 and B2; and when the first numerical value is 8, the corresponding first and second thresholds are denoted as A3 and B3.

[0151] In some embodiments, a first threshold is determined based on the maximum value of at least one of the chip lengths of R2D transmission, and the chip length of D2R transmission; a second threshold is determined based on the minimum value of at least one of the chip lengths of R2D transmission, and the chip length of D2R transmission. In some embodiments, the values ​​of the first threshold and the second threshold are related to a first value. In some embodiments, the value of the first threshold is determined based on the minimum value of the first value, and the value of the second threshold is determined based on the maximum value of the first value. The chip length of R2D transmission is determined based on the length of an OFDM symbol and the first value, where the first value is inversely proportional to the chip length of R2D transmission. For example, the first value may be 2, 4, or 8. When the first value is 2, the chip length of R2D transmission is the maximum, and the first threshold is determined based on this chip length; when the first value is 8, the chip length of R2D transmission is the minimum, and the second threshold is determined based on this chip length. It should be noted that in this case, the first value could also be 4. In this case, the ratio of the R2D chip length to the D2R transmission chip length falls within the first range formed by the first and second thresholds. Therefore, the D2R transmission chip length needs to be limited, and it differs from the R2D transmission chip length corresponding to the first value of 4. Thus, the aforementioned first range can be rewritten as... and or and

[0152] Let A represent the first threshold and B represent the second threshold, then the first range can be expressed as: and Where T chip，D2R It is determined based on the chip length of D2R transmission, T chip，R2D It is determined based on the chip length of R2D transmission.

[0153] In some embodiments, the first threshold is greater than or equal to the second threshold.

[0154] In some embodiments, the values ​​of the first threshold and the second threshold are associated with the first numerical value. In some embodiments, for each possible value of the first numerical value, there are corresponding first and second thresholds. The first numerical value is determined based on the number of chips corresponding to one OFDM symbol in OOK-4 modulation. For example, the first numerical value may be 2, 4, or 8. When the first numerical value is 2, the corresponding first and second thresholds are denoted as A1 and B1; when the first numerical value is 4, the corresponding first and second thresholds are denoted as A2 and B2; and when the first numerical value is 8, the corresponding first and second thresholds are denoted as A3 and B3.

[0155] In some embodiments, a first threshold is determined based on the minimum of at least one value of the chip length for R2D transmission and the chip length for D2R transmission; a second threshold is determined based on the maximum of at least one value of the chip length for R2D transmission and the chip length for D2R transmission. In some embodiments, the values ​​of the first threshold and the second threshold are related to a first value. In some embodiments, the value of the first threshold is determined based on the maximum value of the first value, and the value of the second threshold is determined based on the minimum value of the first value. The chip length for R2D transmission is determined based on the length of an OFDM symbol and the first value, where the first value is inversely proportional to the chip length for R2D transmission. For example, the first value may be 2, 4, or 8. When the first value is 2, the chip length for R2D transmission is the maximum, and the second threshold is determined based on this chip length for R2D transmission; when the first value is 8, the chip length for R2D transmission is the minimum, and the first threshold is determined based on this chip length for R2D transmission. It should be noted that in this case, the first value may also be 4. In this case, the ratio of the R2D chip length to the D2R transmission chip length is not within the first range composed of the first threshold and the second threshold. Therefore, the ratio between the D2R transmission chip length and the R2D transmission chip length corresponding to the first value of 4 will not be equal to 1.

[0156] In some embodiments, the first threshold is determined based on protocol predefined information or network configuration information. In some embodiments, the second threshold is determined based on protocol predefined information or network configuration information. In some embodiments, if the first threshold and / or the second threshold are predefined, then the first threshold and / or the second threshold are determined based on protocol predefined information. In some embodiments, if the first threshold and / or the second threshold are configured by the network device, then the first threshold and / or the second threshold are determined based on network configuration information.

[0157] The technical solutions provided in this application embodiment give several ways to set the chip length of D2R transmission to be different from that of R2D transmission, so that the chip length corresponding to D2R transmission is different from that corresponding to the start indication part of R2D transmission, thereby avoiding false detection of the start indication part of R2D transmission by the device.

[0158] It should be noted that the two embodiments provided above, which have different chip lengths for R2D transmission and D2R transmission, can be combined with step 1110 to obtain new embodiments, or they can be combined with step a to obtain new embodiments.

[0159] For example, the first embodiment is combined with step 1110 to obtain a new embodiment, which includes step 1111.

[0160] Step 1111: The first device sends the first channel, which is the channel used for R2D transmission. The chip length of R2D transmission is greater than the chip length of D2R transmission.

[0161] For example, embodiment two is combined with step 1110 to obtain a new embodiment, which includes step 1112.

[0162] Step 1112: The first device sends a first channel, which is the channel used for R2D transmission. The ratio of the chip length of R2D transmission to the chip length of D2R transmission is within a first range.

[0163] For example, embodiment one is combined with step a to obtain a new embodiment, which includes step a1.

[0164] Step a1: The second device receives the first channel, which is the channel used for R2D transmission. The chip length of R2D transmission is greater than the chip length of D2R transmission.

[0165] For example, embodiment two is combined with step a to obtain a new embodiment, which includes step a2.

[0166] In step a2, the second device receives the first channel, which is the channel used for R2D transmission, and the ratio of the chip length of R2D transmission to the chip length of D2R transmission is within a first range.

[0167] In the above method embodiments, the technical solution of this application has been described and explained only from the perspective of the interaction between the first device and the second device. The steps performed by the first device described above can be implemented independently as a wireless communication method on the first device side, and the steps performed by the second device described above can be implemented independently as a wireless communication method on the second device side. Furthermore, the embodiments provided herein can be arbitrarily combined to form new embodiments, all of which are within the protection scope of this application.

[0168] The following are embodiments of the apparatus described in this application, which can be used to execute the embodiments of the method described in this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method described in this application.

[0169] Please refer to Figure 13, which shows a block diagram of a wireless communication device according to an embodiment of this application. This device has the function of implementing the wireless communication method described above on the first device side. This function can be implemented in hardware or by hardware executing corresponding software. This device can be the first device described above, or it can be disposed within the first device. As shown in Figure 13, the device 1300 may include a transmitting module 1310.

[0170] The transmitting module 1310 is used to transmit a first channel, which is a channel used for R2D transmission, and the chip length of the R2D transmission is different from the chip length of the D2R transmission.

[0171] In some embodiments, the first channel or the preamble portion associated with the first channel carries first indication information, and the chip length of the R2D transmission is determined based on the first indication information.

[0172] In some embodiments, the chip length of the R2D transmission is determined based on the modulation scheme of the first channel.

[0173] In some embodiments, the modulation scheme of the first channel is On-Off Keying (OOK-1) modulation, and the chip length of the R2D transmission is equal to the length of an Orthogonal Frequency Division Multiplexing (OFDM) symbol; or, the modulation scheme of the first channel is OOK-4 modulation, and the chip length of the R2D transmission is determined based on the length of an OFDM symbol and a first value, wherein the first value is the number of chips corresponding to the OFDM symbol.

[0174] In some embodiments, the chip length of the D2R transmission is greater than the chip length of the R2D transmission.

[0175] In some embodiments, the chip length of the D2R transmission is greater than the maximum value among at least one of the chip lengths of the R2D transmission.

[0176] In some embodiments, the ratio of the chip length of the D2R transmission to the chip length of the R2D transmission is greater than a first threshold; and / or, the ratio of the chip length of the D2R transmission to the chip length of the R2D transmission is less than a second threshold.

[0177] In some embodiments, the first threshold is determined based on the minimum of at least one value of the chip length of the R2D transmission and the chip length of the D2R transmission; and / or, the second threshold is determined based on the maximum of at least one value of the chip length of the R2D transmission and the chip length of the D2R transmission.

[0178] In some embodiments, the first threshold is determined based on the maximum value of at least one of the chip lengths of the R2D transmission and the chip length of the D2R transmission; the second threshold is determined based on the minimum value of at least one of the chip lengths of the R2D transmission and the chip length of the D2R transmission.

[0179] In some embodiments, the first threshold is determined based on protocol predefined information or network configuration information; and / or, the second threshold is determined based on protocol predefined information or network configuration information.

[0180] In some embodiments, the chip length of the R2D transmission is the chip length corresponding to the PRDCH, or the length corresponding to the high level of the start indication information in the R2D transmission, or the length corresponding to the low level of the start indication information in the R2D transmission; the chip length of the D2R transmission is the chip length corresponding to the PDRCH, or the chip length corresponding to the post-synchronization signal in the D2R transmission.

[0181] The technical solution provided in this application embodiment has a different chip length for R2D transmission than for D2R transmission. After receiving a high level, the second device can determine whether the high level belongs to R2D transmission or D2R transmission based on the chip length corresponding to the high level. There is no need to worry that the second device will detect the high level of D2R transmission as the start bit of R2D transmission, thereby avoiding the second device's false detection of the start indication part of R2D transmission.

[0182] Please refer to Figure 14, which shows a block diagram of a wireless communication device provided in an embodiment of this application. This device has the function of implementing the wireless communication method described above on the second device side. This function can be implemented in hardware or by hardware executing corresponding software. This device can be the second device described above, or it can be disposed within a second device. As shown in Figure 14, the device 1400 may include a receiving module 1410.

[0183] The receiving module 1410 is used to receive a first channel, which is a channel used for R2D transmission, and the chip length of the R2D transmission is different from the chip length of the D2R transmission.

[0184] In some embodiments, the first channel or the preamble portion associated with the first channel carries first indication information, and the chip length of the R2D transmission is determined based on the first indication information.

[0185] In some embodiments, the chip length of the R2D transmission is determined based on the modulation scheme of the first channel.

[0186] In some embodiments, the modulation scheme of the first channel is On-Off Keying (OOK-1) modulation, and the chip length of the R2D transmission is equal to the length of an Orthogonal Frequency Division Multiplexing (OFDM) symbol; or, the modulation scheme of the first channel is OOK-4 modulation, and the chip length of the R2D transmission is determined based on the length of an OFDM symbol and a first value, wherein the first value is the number of chips corresponding to the OFDM symbol.

[0187] In some embodiments, the chip length of the D2R transmission is greater than the chip length of the R2D transmission.

[0188] In some embodiments, the chip length of the D2R transmission is greater than the maximum value among at least one of the chip lengths of the R2D transmission.

[0189] In some embodiments, the ratio of the chip length of the D2R transmission to the chip length of the R2D transmission is greater than a first threshold; and / or, the ratio of the chip length of the D2R transmission to the chip length of the R2D transmission is less than a second threshold.

[0190] In some embodiments, the first threshold is determined based on the minimum of at least one value of the chip length of the R2D transmission and the chip length of the D2R transmission; and / or, the second threshold is determined based on the maximum of at least one value of the chip length of the R2D transmission and the chip length of the D2R transmission.

[0191] In some embodiments, the first threshold is determined based on the maximum value of at least one of the chip lengths of the R2D transmission and the chip length of the D2R transmission; the second threshold is determined based on the minimum value of at least one of the chip lengths of the R2D transmission and the chip length of the D2R transmission.

[0192] In some embodiments, the first threshold is determined based on protocol predefined information or network configuration information; and / or, the second threshold is determined based on protocol predefined information or network configuration information.

[0193] In some embodiments, the chip length of the R2D transmission is the chip length corresponding to the PRDCH, or the length corresponding to the high level of the start indication information in the R2D transmission, or the length corresponding to the low level of the start indication information in the R2D transmission; the chip length of the D2R transmission is the chip length corresponding to the PDRCH, or the chip length corresponding to the post-synchronization signal in the D2R transmission.

[0194] The technical solution provided in this application embodiment has a different chip length for R2D transmission than for D2R transmission. After receiving a high level, the second device can determine whether the high level belongs to R2D transmission or D2R transmission based on the chip length corresponding to the high level. There is no need to worry that the second device will detect the high level of D2R transmission as the start bit of R2D transmission, thereby avoiding the second device's false detection of the start indication part of R2D transmission.

[0195] It should be noted that the above embodiments only illustrate the division of the above functional modules when implementing the device. In actual applications, the above functions can be assigned to different functional modules according to actual needs, that is, the content structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0196] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here. For details not described in detail in the apparatus embodiments, please refer to the above method embodiments.

[0197] Please refer to Figure 15, which shows a schematic diagram of a communication device provided in one embodiment of this application. This communication device can be either the first device or the second device described above. The communication device 1500 may include at least one of a processor 1501, a transceiver 1502, and a memory 1503. The processor 1501 is used to implement various processing functions of the communication device 1500, such as generating information to be sent, processing received information, and controlling transmission and / or reception. The transceiver 1502 is used to implement transmission and / or reception functions, such as implementing the functions of the transmission module 1310 described above, or implementing the functions of the reception module 1410 described above.

[0198] The processor 1501 includes one or more processing cores, and the processor 1501 executes various functional applications and information processing by running software programs and modules.

[0199] The transceiver 1502 may include a receiver and a transmitter, for example, the receiver and transmitter may be implemented as the same wireless communication component, which may include a wireless communication chip and a radio frequency antenna.

[0200] The memory 1503 can be connected to the processor 1501 and the transceiver 1502.

[0201] The memory 1503 can be used to store a computer program executed by the processor, and the processor 1501 is used to execute the computer program to implement the various steps in the above method embodiments.

[0202] Optionally, the communication device 1500 is the first device described in the above embodiment, and the transceiver 1502 is used to transmit a first channel, which is a channel used for R2D transmission, and the chip length of the R2D transmission is different from the chip length of the D2R transmission.

[0203] Optionally, the communication device 1500 is the second device in the above embodiment, and the transceiver 1502 is used to receive the first channel, which is the channel used for R2D transmission, and the chip length of the R2D transmission is different from the chip length of the D2R transmission.

[0204] For details not described in this embodiment, please refer to the embodiments above, which will not be repeated here.

[0205] Furthermore, the memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: magnetic disks or optical disks, electrically erasable programmable read-only memory, erasable programmable read-only memory, statically accessible memory, read-only memory, magnetic memory, flash memory, and programmable read-only memory.

[0206] This application also provides a computer-readable storage medium storing a computer program for execution by a processor to implement the wireless communication method on the first device side or the wireless communication method on the second device side. In some embodiments, the computer-readable storage medium may include ROM (Read-Only Memory), RAM (Random-Access Memory), SSD (Solid State Drives), or optical disc, etc. The random access memory may include ReRAM (Resistance Random Access Memory) and DRAM (Dynamic Random Access Memory).

[0207] This application also provides a chip, which includes programmable logic circuits and / or program instructions. When the chip is running, it is used to implement the wireless communication method on the first device side or the wireless communication method on the second device side.

[0208] This application also provides a computer program product, which includes computer instructions stored in a computer-readable storage medium. A processor reads and executes the computer instructions from the computer-readable storage medium to implement the wireless communication method on the first device side or the wireless communication method on the second device side.

[0209] It should be understood that the term "instruction" mentioned in the embodiments of this application can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0210] In the description of the embodiments of this application, the term "correspondence" may indicate that there is a direct or indirect correspondence between two things, or that there is an association between two things, or that there is a relationship of instruction and being instructed, configuration and being configured, etc.

[0211] In some embodiments of this application, "predefined" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including a first device and a second device). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0212] In some embodiments of this application, the term "protocol" may refer to standard protocols in the field of communications, such as BLE protocol, Wi-Fi protocol, and related protocols applied in future communication systems. This application does not limit the scope of these protocols.

[0213] In this article, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0214] In this article, "greater than or equal to" can mean greater than or equal to, and "less than or equal to" can mean less than or equal to.

[0215] Furthermore, the step numbers described herein are merely illustrative of one possible execution order between steps. In some other embodiments, the steps may not be executed in the order of their numbers, such as two steps with different numbers being executed simultaneously, or two steps with different numbers being executed in the reverse order of the illustration. This application does not limit this.

[0216] Those skilled in the art will recognize that the functions described in the embodiments of this application in one or more of the above examples can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of a computer program from one place to another. Storage media can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0217] The above description is merely an exemplary embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A wireless communication method, characterized in that, The method is performed by a first device, and the method includes: Send a first channel, which is the channel used for reader-to-device R2D transmission, and the chip length of the R2D transmission is different from the chip length of device-to-reader D2R transmission.

2. The method according to claim 1, characterized in that, The first channel or the preamble portion associated with the first channel carries first indication information, and the chip length of the R2D transmission is determined based on the first indication information.

3. The method according to claim 1 or 2, characterized in that, The chip length of the R2D transmission is determined based on the modulation scheme of the first channel.

4. The method according to claim 3, characterized in that, The modulation scheme of the first channel is On-Off Keying (OOK-1) modulation, and the chip length of the R2D transmission is equal to the length of one Orthogonal Frequency Division Multiplexing (OFDM) symbol; or, The modulation scheme of the first channel is OOK-4 modulation scheme, and the chip length of the R2D transmission is determined based on the length of an OFDM symbol and a first value, where the first value is the number of chips corresponding to the OFDM symbol.

5. The method according to any one of claims 1 to 4, characterized in that, The chip length of the D2R transmission is greater than the chip length of the R2D transmission.

6. The method according to claim 5, characterized in that, The chip length of the D2R transmission is greater than the maximum value among at least one of the chip lengths of the R2D transmission.

7. The method according to any one of claims 1 to 4, characterized in that, The ratio of the chip length of the D2R transmission to the chip length of the R2D transmission is greater than a first threshold; and / or, The ratio of the chip length of the D2R transmission to the chip length of the R2D transmission is less than the second threshold.

8. The method according to claim 7, characterized in that, The first threshold is determined based on the minimum value of at least one of the chip lengths of the R2D transmission, and the chip length of the D2R transmission; and / or, The second threshold is determined based on the maximum value of at least one of the chip lengths of the R2D transmission, and the chip length of the D2R transmission.

9. The method according to claim 7, characterized in that, The first threshold is determined based on the maximum value of at least one of the chip lengths of the R2D transmission and the chip length of the D2R transmission; The second threshold is determined based on the minimum value of at least one of the chip lengths of the R2D transmission, and the chip length of the D2R transmission.

10. The method according to any one of claims 7 to 9, characterized in that, The first threshold is determined based on predefined protocol information or network configuration information; and / or, The second threshold is determined based on protocol predefined information or network configuration information.

11. The method according to any one of claims 1 to 10, characterized in that, The chip length of the R2D transmission is the chip length corresponding to PRDCH, or the length corresponding to the high level of the start indication information in the R2D transmission, or the length corresponding to the low level of the start indication information in the R2D transmission. The chip length of the D2R transmission is the chip length corresponding to PDRCH, or the chip length corresponding to the post-synchronization signal in the D2R transmission.

12. A wireless communication method, characterized in that, The method is performed by a second device, and the method includes: Receive a first channel, which is the channel used for reader-to-device R2D transmission, and the chip length of the R2D transmission is different from the chip length of device-to-reader D2R transmission.

13. The method according to claim 12, characterized in that, The first channel or the preamble portion associated with the first channel carries first indication information, and the chip length of the R2D transmission is determined based on the first indication information.

14. The method according to claim 12 or 13, characterized in that, The chip length of the R2D transmission is determined based on the modulation scheme of the first channel.

15. The method according to claim 14, characterized in that, The modulation scheme of the first channel is On-Off Keying (OOK-1) modulation, and the chip length of the R2D transmission is equal to the length of one Orthogonal Frequency Division Multiplexing (OFDM) symbol; or, The modulation scheme of the first channel is OOK-4 modulation scheme, and the chip length of the R2D transmission is determined based on the length of an OFDM symbol and a first value, where the first value is the number of chips corresponding to the OFDM symbol.

16. The method according to any one of claims 12 to 15, characterized in that, The chip length of the D2R transmission is greater than the chip length of the R2D transmission.

17. The method according to claim 16, characterized in that, The chip length of the D2R transmission is greater than the maximum value among at least one of the chip lengths of the R2D transmission.

18. The method according to any one of claims 12 to 15, characterized in that, The ratio of the chip length of the D2R transmission to the chip length of the R2D transmission is greater than a first threshold; and / or, The ratio of the chip length of the D2R transmission to the chip length of the R2D transmission is less than the second threshold.

19. The method according to claim 18, characterized in that, The first threshold is determined based on the minimum value of at least one of the chip lengths of the R2D transmission, and the chip length of the D2R transmission; and / or, The second threshold is determined based on the maximum value of at least one of the chip lengths of the R2D transmission, and the chip length of the D2R transmission.

20. The method according to claim 18, characterized in that, The first threshold is determined based on the maximum value of at least one of the chip lengths of the R2D transmission and the chip length of the D2R transmission; The second threshold is determined based on the minimum value of at least one of the chip lengths of the R2D transmission, and the chip length of the D2R transmission.

21. The method according to any one of claims 18 to 20, characterized in that, The first threshold is determined based on predefined protocol information or network configuration information; and / or, The second threshold is determined based on protocol predefined information or network configuration information.

22. The method according to any one of claims 12 to 21, characterized in that, The chip length of the R2D transmission is the chip length corresponding to PRDCH, or the length corresponding to the high level of the start indication information in the R2D transmission, or the length corresponding to the low level of the start indication information in the R2D transmission. The chip length of the D2R transmission is the chip length corresponding to PDRCH, or the chip length corresponding to the post-synchronization signal in the D2R transmission.

23. A wireless communication device, characterized in that, The device includes: The transmitting module is used to transmit a first channel, which is the channel used for reader-to-device R2D transmission. The chip length of the R2D transmission is different from the chip length of device-to-reader D2R transmission.

24. A wireless communication device, characterized in that, The device includes: The receiving module is used to receive a first channel, which is the channel used for reader-to-device R2D transmission. The chip length of the R2D transmission is different from the chip length of device-to-reader D2R transmission.

25. A communication device, characterized in that, The communication device includes a processor and a memory, the memory storing a computer program, the processor executing the computer program to implement the method as claimed in any one of claims 1 to 11, or to implement the method as claimed in any one of claims 12 to 22.

26. A computer-readable storage medium, characterized in that, The storage medium stores a computer program that is executed by a processor to implement the method as described in any one of claims 1 to 11, or the method as described in any one of claims 12 to 22.

27. A chip, characterized in that, The chip includes programmable logic circuitry and / or program instructions, which, when the chip is running, are used to implement the method as described in any one of claims 1 to 11, or to implement the method as described in any one of claims 12 to 22.

28. A computer program product, characterized in that, The computer program product includes computer instructions stored in a computer-readable storage medium, which a processor reads from and executes to implement the method as claimed in any one of claims 1 to 11, or the method as claimed in any one of claims 12 to 22.

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