WIRELESS COMMUNICATION METHODS, TERMINAL DEVICES AND NETWORK DEVICES

TECHNICAL FIELD

Embodiments of the present application relate to the field of communication, and specifically, to wireless communication methods, terminal devices, and network devices.

BACKGROUND

In order to improve the reliability of data transmission, or to increase the cell coverage performance, a repetition transmission mechanism is introduced in the New Radio (NR) system. However, considering actual applications, not all scenarios can support all numbers of repetition transmissions. For example, in some scenarios, for a dynamic grant physical uplink shared channel (DG-PUSCH), the number of repetition transmissions such as {1, 2, 3, 4, 7, 8, 12, 16, 20, 24, 28, 32} may be supported, and for a configured grant physical uplink shared channel (CG-PUSCH), the number of repetition transmissions such as {1, 2, 3, 4, 7, 8, 12, 16} may be supported.

During actual data transmission, due to different channel conditions, the number of repetition transmissions required is also different. A network device can only configure the number of repetition transmissions as many as possible to ensure the reliability of data transmission. For example, when the PUSCH actually needs to be transmitted repeatedly 12 times to achieve the required performance, the network device will configure the number of repetition transmissions to 16 or 20, which will cause a waste of resources and bring about a greater transmission delay. Therefore, how to improve repetition transmission performance is an urgent problem to be solved.

SUMMARY

The present disclosure provides wireless communication methods, terminal devices and network devices.

In a first aspect, a wireless communication method is provided. The method includes: in a case where a first downlink channel is correctly decoded and a number L of repetition transmissions of the first downlink channel is less than K, terminating, by a terminal device, reception of remaining repetition transmissions of the first downlink channel, where K represents a configured number of repetition transmissions of the first downlink channel, and the K is a positive integer; and transmitting, by the terminal device, first indication information to a network device by back scattering, where the first indication information is used to indicate that the terminal device correctly decodes the first downlink channel.

In a second aspect, a wireless communication method is provided. The method includes: performing, by a terminal device, repetition transmissions of a first uplink channel, where a configured number of the repetition transmissions of the first uplink channel is K; in a case of receiving a first signal from a network device, terminating, by the terminal device, remaining repetition transmissions of the first uplink channel, where the first signal is used to indicate a termination of the repetition transmissions of the first uplink channel.

In a third aspect, a wireless communication method is provided. The method includes: receiving, by a network device, first indication information transmitted by a terminal device by back scattering, where the first indication information is used to indicate that the terminal device correctly decodes a first downlink channel; and terminating, by the network device, remaining repetition transmissions of the first downlink channel.

In a fourth aspect, a wireless communication method is provided. The method includes: in a case where a first uplink channel is correctly decoded and a number Z of repetition transmissions of the first uplink channel is less than K, terminating, by a network device, reception of remaining repetition transmissions of the first uplink channel, where the K represents a total number of repetition transmissions of the first uplink channel, the K is a positive integer, and the Z is a positive integer; and transmitting a first signal to a terminal device for indicating a termination of repetition transmissions of the first uplink channel.

In a fifth aspect, a terminal device is provided to perform the method in any one of the first to second aspects or various implementations thereof. Exemplarily, the terminal device includes a functional module for performing the method in any one of the first to second aspects or various implementations thereof.

In a sixth aspect, a network device is provided to perform the method in any one of the third to fourth aspects or various implementations thereof. Exemplarily, the network device includes a functional module for performing the method in any one of the third to fourth aspects or various implementations thereof.

In a seventh aspect, a terminal device is provided and includes a processor and a memory. The memory is configured to store a computer program, and the processor is configured to invoke and run the computer program stored in the memory to perform the method in any one of the first to second aspects or various implementations thereof.

In an eighth aspect, a network device is provided and includes a processor and a memory. The memory is configured to store a computer program, and the processor is configured to invoke and run the computer program stored in the memory to perform the method in any one of the third to fourth aspects or various implementations thereof.

In a ninth aspect, a chip is provided to implement the method in any one of the first to fourth aspects or various implementations thereof. Exemplarily, the chip includes: a processor configured to invoke a computer program from a memory and run the computer program, so as to enable a device equipped with the chip to perform the method in any one of the first to fourth aspects or various implementations thereof.

In a tenth aspect, a computer-readable storage medium is provided for storing a computer program. The computer program enables a computer to perform the method in any one of the first to fourth aspects or various implementations thereof.

In an eleventh aspect, a computer program product is provided and includes computer program instructions. The computer program instructions enable a computer to perform the method in any one of the first to fourth aspects or various implementations thereof.

In a twelfth aspect, a computer program is provided. When being executed on a computer, the computer program enables the computer to perform the method in any one of the first to fourth aspects or various implementations thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a communication system architecture provided by the embodiments of the present disclosure.

FIG. 2 is a schematic diagram of a zero power consumption communication system according to an example of the present disclosure.

FIG. 3 is a diagram showing a principle of power harvesting according to an embodiment of the present disclosure.

FIG. 4 is a diagram showing a principle of back scattering communication according to an embodiment of the present disclosure.

FIG. 5 is a diagram showing a circuit principle of resistive load modulation according to an embodiment of the present disclosure.

FIG. 6 is a timing schematic diagram of scheduling and retransmission of PDSCH/PUSCH in the NR system.

FIG. 7 is a schematic interaction diagram of a wireless communication method according to the embodiments of the present disclosure.

FIG. 8 is a schematic diagram of a terminal device terminating reception of repetition transmissions of a PDSCH in advance according to an embodiment of the present disclosure.

FIG. 9 is a schematic diagram of a terminal device terminating reception of repetition transmissions of a PDSCH in advance according to another embodiment of the present disclosure.

FIG. 10 is a schematic interaction diagram of a wireless communication method according to an embodiment of the present disclosure.

FIG. 11 is a schematic diagram of a transmitter of a terminal device according to an embodiment of the present disclosure.

FIG. 12 is a schematic diagram of a transmitter of a terminal device according to another embodiment of the present disclosure.

FIG. 13 is a schematic diagram of a transmitter of a terminal device according to yet another embodiment of the present disclosure.

FIG. 14 is a schematic interaction diagram of another wireless communication method according to the embodiments of the present disclosure.

FIG. 15 is a schematic diagram of a network device terminating reception of repetition transmissions of a PUSCH in advance according to an embodiment of the present disclosure.

FIG. 16 is a schematic diagram of a receiver of a terminal device according to an embodiment of the present disclosure.

FIG. 17 is a schematic interaction diagram of a wireless communication method according to an embodiment of the present disclosure.

FIG. 18 is a schematic block diagram of a terminal device according to the embodiments of the present disclosure.

FIG. 19 is a schematic block diagram of a network device according to the embodiments of the present disclosure.

FIG. 20 is a schematic block diagram of another terminal device according to the embodiments of the present disclosure.

FIG. 21 is a schematic block diagram of another network device according to the embodiments of the present disclosure.

FIG. 22 is a schematic block diagram of a communication device according to the embodiments of the present disclosure.

FIG. 23 is a schematic block diagram of a chip according to the embodiments of the present disclosure.

FIG. 24 is a schematic block diagram of a communication system according to the embodiments of the present disclosure.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present disclosure will be described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. With respect to the embodiments of the present disclosure, all other embodiments obtained by ordinary skilled in the art shall fall within the scope of protection of the present disclosure.

The technical solutions of the embodiments of the present disclosure may be applied to various communication systems, such as: a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) system, a general packet radio service (GPRS), a long term evolution (LTE) system, an advanced long term evolution (LTE-A) system, a new radio (NR) system, an NR system evolution system, a LTE-based access to unlicensed spectrum (LTE-U) system, an NR-based access to unlicensed spectrum (NR-U) system, a non-terrestrial networks (NTN) system, a universal mobile telecommunication system (UMTS), a wireless local area networks (WLAN), a wireless fidelity (WiFi) system, a 5-th generation (5G) communication system, a cellular Internet of Things system, a cellular passive Internet of Things system, or other communication systems.

Generally speaking, traditional communication systems 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 communications, but will also support, 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 the present disclosure may also be applied to these communication systems.

Optionally, the communication system in the embodiments of the present disclosure may be applied to a carrier aggregation (CA) scenario, may also be applied to a dual connectivity (DC) scenario, or may further be applied to a standalone (SA) networking scenario.

Optionally, the communication system in the embodiments of the present disclosure may be applied to an unlicensed spectrum, where the unlicensed spectrum may also be considered as a shared spectrum; alternatively, the communication system in the embodiments of the present disclosure may also be applied to an licensed spectrum, where the licensed spectrum may also be considered as an unshared spectrum.

The embodiments of the present disclosure describe various embodiments in conjunction with a network device and a terminal device, where the terminal device may also be referred to as a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile platform, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user device, etc.

In the embodiments of the present disclosure, the network device may be a device used for communicating with a mobile device. The network device may be an access point (AP) in the WLAN, a base transceiver station (BTS) in the GSM or CDMA, a base station (NodeB, NB) in the WCDMA, an evolutional base station (evolutional NodeB, eNB or eNodeB) in the LTE, or a relay station or an access point, or a vehicle-mounted device, a wearable device, and a network device (gNB) in the NR network, or a network device in the cellular Internet of Things, or a network device in the cellular passive Internet of Things, or a network device in a future evolved public land mobile network (PLMN) network or a network device in the NTN network, etc.

As an example but not limitation, in the embodiments of the present disclosure, the network device may have a mobile characteristic, for example, the network device may be a mobile device. Optionally, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, or the like. Optionally, the network device may also be a base station arranged on land, water or the like.

In the embodiments of the present disclosure, the network device may provide services for a cell, and the terminal device may communicate with the network device through transmission resources (e.g., frequency domain resources, or spectrum resources) used by the cell. The cell may be a cell corresponding to the network device (e.g., a base station). The cell may belong to a macro base station or a base station corresponding to a small cell. The small cell here may include: a Metro cell, a Micro cell, a Pico cell, a Femto cell, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

The terminal device may be a station (ST) in the WLAN, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) device, a handheld device with a wireless communication function, a computing device or another processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a next-generation communication system such as an NR network, or a terminal device in a future evolved public land mobile network (PLMN) network, a terminal device in a cellular Internet of Things, a terminal device in a cellular passive Internet of Things, etc.

In the embodiments of the present disclosure, the terminal device may be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; the terminal device may also be deployed on the water surface (e.g., on a ship); and the terminal device may also be deployed in the air (e.g., on an airplane, on a balloon and on a satellite).

In the embodiments of the present disclosure, the terminal device may be a mobile phone, a pad, a computer with a wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self driving, a wireless terminal device in remote medical, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, or a wireless terminal device in a smart home, etc.

As an example but not limitation, in the embodiments of the present disclosure, the terminal device may also be a wearable device. The wearable device may also be referred to as a wearable smart device, which is a general term for wearable devices developed by performing intelligent design on daily wear (such as glasses, gloves, a watch, clothing, or shoes) using wearable technology. The wearable device is a portable device that is worn directly on a body, or integrated into the user's clothing or accessories. The wearable device is not just a hardware device, but also implements powerful functions through software support as well as data interaction and cloud interaction. Generalized wearable smart devices include devices (such as smart watches or smart glasses) that have full functionality, large-size, and may implement full or partial functionality without relying on smart phones, and devices (such as various smart bracelets or smart jewelries for monitoring physical signs) that focus on a certain type of application functionality only and need to be used in conjunction with other devices (such as smart phones).

For example, a communication system 100 applied in the embodiments of the present disclosure is shown in FIG. 1. The communication system 100 may include a network device 110, and the network device 110 may be a device for communicating with a terminal device 120 (or referred to as a communication terminal or a terminal). The network device 110 may provide communication coverage for a specific geographical area and may communicate with the terminal device located within the coverage area.

FIG. 1 exemplarily shows a network device and two terminal devices. Optionally, the communication system 100 may include a plurality of network devices, and a coverage area of each network device may include another number of terminal devices, which is not limited in the embodiments of the present disclosure.

Optionally, the communication system 100 may further include a network controller, a mobility management entity, and other network entities, which is not limited in the embodiments of the present disclosure.

It should be understood that a device having a communication function in a network/system in the embodiments of the present disclosure may be referred to as a communication device. Taking the communication system 100 shown in FIG. 1 as an example, the communication device may include a network device 110 and a terminal device 120 that have communication functions. The network device 110 and the terminal device 120 may be the specific devices described above and will not be repeated here; and the communication device may also include other devices, such as a network controller, a mobility management entity and other network entities, in the communication system 100, which is not limited in the embodiments of the present disclosure.

It should be understood that the terms “system” and “network” are often used interchangeably herein. The term “and/or” herein is only a description of an association relationship between the associated objects, and indicates that there may be three relationships between the associated objects. For example, A and/or B may represent three cases: A alone, A and B both, and B alone. In addition, the character “/” herein generally indicates that the associated objects before and after this character are in an “or” relationship.

It should be understood that the term “indicate” mentioned in the embodiments of the present disclosure may be a direct indication, an indirect indication, or an indication of an association relationship. For example, A indicating B may mean that A directly indicates B (e.g., B may be obtained through A); A indirectly indicates B (e.g., A indicates C, and B may be obtained through C); or there is an association relationship between A and B.

In the description of the embodiments of the present disclosure, the term “corresponding” may represent a direct or indirect correspondence between two items, or an association relationship between the two items, or a relationship of indicating and being indicated, a relationship of configuring and being configured, and the like.

In the embodiments of the present disclosure, the term “predefine” may be achieved by pre-saving corresponding codes, tables or other methods that may be used to indicate relevant information in a device (e.g., including a terminal device and a network device). The present disclosure does not limit its specific implementation. For example, predefinition may refer to definition in a protocol.

In the embodiments of the present disclosure, the “protocol” may refer to a standard protocol in the communication field, for example, the standard protocol may include an LTE protocol, an NR protocol, and related protocols applied in future communication systems, and the present disclosure does not limit this.

To facilitate understanding of the technical solutions of the embodiments of the present disclosure, the related art of the present disclosure is explained.

I. Zero Power Consumption Communication

The key technologies of the zero power consumption communication include power harvesting, back scattering communication and low power consumption technology.

As shown in FIG. 2, a typical zero power consumption communication system (e.g., a radio frequency identification (RFID) system) includes a network device (e.g., a reader/writer of the RFID system) and a zero power consumption device (e.g., an electronic tag). The network device is configured to transmit a wireless power supply signal and a downlink communication signal to the zero power consumption device and receive a back scattering signal from the zero power consumption device. A basic zero power consumption device contains a power harvesting module, a back scattering module, and a low power consumption computing module. In addition, the zero power consumption device may also have a memory or a sensor used to store some basic information (such as object identification) or sensor data such as ambient temperature and ambient humidity.

A power harvesting module, a back scattering module, and a low power consumption computing module are contained. In addition, the zero power consumption device may also have a memory or a sensor used to store some basic information (such as object identification) or sensor data such as ambient temperature and ambient humidity.

For example, the power harvesting module may harvest power carried by radio waves in space (radio waves emitted by the network device are shown in FIG. 2) to drive the low power consumption computing module of the zero power consumption device and achieve back scattering. After obtaining power, the zero power consumption device may receive a control command from the network device and transmit data to the network device based on a control signaling by back scattering. The data transmitted may be data stored in the zero power consumption device itself (e.g., an identity identifier or pre-written information, such as the production date, brand, and manufacturer of the product). The zero power consumption device may also be loaded with various sensors, so as to report the data collected by various sensors based on the zero power consumption mechanism.

The following describes the key technologies in zero-power communication.

1. RF Power Harvesting

As shown in FIG. 3, the RF power harvesting module achieves harvesting electromagnetic wave power in space based on the principle of electromagnetic induction, and then obtains the power required for driving the zero power consumption device to work, such as for driving low power consumption demodulation and modulation modules, sensors, and memory access. Therefore, the zero power consumption device does not require traditional batteries.

2. Back Scattering Communication

As shown in FIG. 4, the zero power consumption device receives the carrier signal transmitted by the network device, modulates the carrier signal, loads the information required to be transmitted and radiates the modulated signal from the antenna. This information transmission process is referred to as back scattering communication. Back scattering and load modulation functions are inseparable. Load modulation adjusts and controls the circuit parameters of the oscillation loop of the zero power consumption device according to the rhythm of the data stream, so that parameters such as the impedance of the zero power consumption device change accordingly, thereby 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, which is switched on or off based on the control of the binary data stream, as shown in FIG. 5. The on and off of the resistor will cause the circuit voltage to change, thus realizing amplitude shift keying (ASK), that is, the modulation and transmission of the signal is achieved by adjusting the amplitude of the back scattering signal of the zero power consumption device. Similarly, in capacitive load modulation, the resonant frequency of the circuit may be changed by switching the capacitor on and off, thus realizing frequency shift keying (FSK), that is, the modulation and transmission of the signal is achieved by adjusting the operating frequency of the back scattering signal of the zero power consumption device.

It can be seen that the zero power consumption device performs information modulation on the incoming signal, thereby realizing the back scattering communication process. Therefore, the zero power consumption device has significant advantages:

- (1) it does not actively transmit a signal, so it does not require complex radio frequency links, such as a power amplifier (PA) or a radio frequency filter;
- (2) there is no need to actively generate a high-frequency signal, so no high-frequency crystal oscillator is required; and
- (3) with the help of back scattering communication, a terminal signal transmission does not need to consume the power of the terminal itself.

3. Encoding Technology

The data transmitted by the zero power consumption device may use different forms of codes to represent binary “1” and “0”. The wireless radio frequency identification system usually use one of the following encoding methods: reverse non-return-to-zero (NRZ) encoding, Manchester encoding, unipolar return-to-zero encoding, differential bi-phase (DBP) encoding, differential encoding, pulse interval encoding (PIE), bi-phase space (FM0) encoding, Miller encoding, differential encoding, etc. In simple terms, different encoding technologies use different pulse signals to represent 0 and 1.

In some scenarios, based on the power source and usage methods of the zero power consumption devices, the zero power consumption devices may be divided into the following types.

1. Passivezero Power Consumption Device

The zero power consumption device (such as an electronic tag in the RFID system) does not require a built-in battery. When the zero power consumption device approaches a network device (such as a reader/writer in the RFID system), the zero power consumption device is located within the near field formed by radiation of an antenna of the network device. Therefore, the antenna of the zero power consumption device generates an induced current through electromagnetic induction, and the induced current drives the low power consumption chip circuit of the zero power consumption device, so as to achieve the demodulation of the forward link signal and the modulation of the reverse link (or reflection link) signal. For the back scattering link, the zero power consumption device transmits signals by back scattering.

It can be seen that the passive zero power consumption device does not require a built-in battery to drive either the forward link or the reverse link, and is a truly zero power consumption device.

The passive zero power consumption device does not require a battery, and the RF circuit and baseband circuit are very simple. For example, the passive zero power consumption device does not require a low-noise amplifier (LNA), a power amplifier (PA), a crystal oscillator, an analog-to-digital converter (ADC) and other devices. Therefore, the passive zero power consumption device has many advantages such as a small size, a light weight, a very low price, and a long service life.

2. Semi-Passive Zero Power Consumption Device

The semi-passive zero power consumption device is not equipped with a conventional battery itself, but may use the RF power harvesting module to harvest radio wave power and store the harvested power in a power storage unit (such as a capacitor). After obtaining power, the power storage unit may drive the low power consumption chip circuit of the zero power consumption device, so as to achieve the demodulation of the forward link signal and the modulation of the reverse link signal. For the back scattering link, the zero power consumption device transmits signals by back scattering.

It can be seen that the semi-passive zero power consumption device does not require a built-in battery to drive either the forward link or the reverse link. Although the power stored in the capacitor is used in the work, the power comes from the radio power collected by the power harvesting module. Therefore, it is also a truly zero power consumption device.

The semi-passive zero power consumption device inherits many advantages of the passive zero power consumption device, and thus has many advantages such as a small size, a light weight, a very low price and a long service life.

3. Active Zero Power Consumption Device

The zero power consumption device used in some scenarios may also be an active zero power consumption device, which may have a built-in battery. The battery is used to drive the low power consumption chip circuit in the zero power consumption device, so as to achieve the demodulation of the forward link signal and the modulation of the reverse link signal. However, for the back scattering link, the zero power consumption device transmits signals by back scattering. Therefore, the zero power consumption of this type of device is mainly reflected in the fact that the signal transmission of the reverse link does not require the power of the terminal itself, but uses back scattering.

II. Cellular Passive Internet of Things

With the increase in 5G industry applications, the types of connected objects and application scenarios are increasing, and there will be an increasing requirements on the cost and power consumption of communication terminals. The application of battery-free, low-cost passive Internet of Things devices will become a key technology for cellular Internet of Thing (IoT), enriching the types and number of 5G network-linked terminals and truly realizing the Internet of Everything. Passive Internet of Things devices may be based on zero power consumption communication technologies such as the RFID technology, and can be extended on this basis to be suitable for the cellular IoT.

To facilitate understanding of the embodiments of the present disclosure, a power supply signal, a scheduling signal and a carrier signal related to zero power consumption communication are explained.

1. Power Supply Signal

The power supply signal is the power source for the zero power consumption device to harvest power.

From the perspective of a power supply signal carrier, the power supply signal carrier may be a base station, a smart phone, a smart gateway, a charging station, a micro base station, etc.

From the perspective of a frequency band, the frequency band of the radio wave used for power supply may be low frequency, medium frequency, high frequency, etc.

From the perspective of a waveform, the waveform of the radio wave used for power supply may be a sine wave, a square wave, a triangle wave, a pulse, a rectangular wave, etc.

In addition, the power supply signal may be a continuous wave or a discontinuous wave (i.e., a certain period of interruption is allowed).

Optionally, the power supply signal may be an existing signal in the 3GPP standard, such as Sounding Reference Signal (SRS), Physical Uplink Shared Channel (PUSCH), Physical Random Access Channel (PRACH), Physical Uplink Control Channel (PUCCH), Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel (PDSCH), or Physical Broadcast Channel (PBCH), or it may be a WIFI signal or a Bluetooth signal.

Optionally, the power supply signal may also be implemented by adding a new signal, for example, adding a signal dedicated to power supply.

2. Trigger Signal or Scheduling Signal

The trigger signal is used to trigger or schedule the zero power consumption device to transmit data.

From the perspective of a trigger signal carrier, the trigger signal carrier may be a base station, a smart phone, a smart gateway, etc.

From the perspective of a frequency band, the frequency band of the radio wave used for triggering or scheduling may be low frequency, medium frequency, high frequency, etc.

From the perspective of a waveform, the waveform of the radio wave used for triggering or scheduling may be a sine wave, a square wave, a triangle wave, a pulse, a rectangular wave, etc.

In addition, the trigger signal may be a continuous wave or a discontinuous wave (i.e., a certain period of interruption is allowed).

Optionally, the trigger signal may be an existing signal in the 3GPP standard, such as SRS, PUSCH, PRACH, PUCCH, PDCCH, PDSCH or PBCH, or a WIFI signal or a Bluetooth signal, or the like.

Optionally, the trigger signal may also be implemented by adding a new signal, for example, adding a signal dedicated to triggering or scheduling.

3. Carrier Signal

The carrier signal is used by the zero power consumption device to generate a back scattering signal. For example, the zero power consumption device may modulate the received carrier signal according to information to be transmitted to form a back scattering signal.

From the perspective of a carrier signal carrier, the carrier signal carrier may be a base station, a smart phone, a smart gateway, etc.

From the perspective of a frequency band, the frequency band of the radio wave used as the carrier signal may be low frequency, medium frequency, high frequency, etc.

From the perspective of a waveform, the waveform of the radio wave used as the carrier signal may be a sine wave, a square wave, a triangle wave, a pulse, a rectangular wave, etc.

In addition, the carrier signal may be a continuous wave or a discontinuous wave (i.e., a certain period of interruption is allowed).

Optionally, the carrier signal may be an existing signal in the 3GPP standard, such as SRS, PUSCH, PRACH, PUCCH, PDCCH, PDSCH or PBCH, or a WIFI signal or a Bluetooth signal, or the like.

Optionally, the carrier signal may also be implemented by adding a new signal, for example, adding a carrier signal dedicated to generating a back scattering signal.

It should be noted that in the embodiments of the present disclosure, the power supply signal, the scheduling signal and the carrier signal may be the same signal, or may also be different signals. For example, the power supply signal may be used as the carrier signal, and the scheduling signal may also be used as the carrier signal.

To facilitate understanding of the embodiments of the present disclosure, repetition transmissions of the data channel in the NR system is explained.

In order to improve the reliability of data transmission in the NR system, a data repetition transmission mechanism is designed.

For downlink data transmission of the Physical Downlink Shared Channel (PDSCH), a pdsch-AggregationFactor and a repetitionNumber are defined to control the number of repetition transmissions of the PDSCH.

Optionally, a configurable value of the pdsch-AggregationFactor is {1, 2, 4, 8}, and a configurable value of the repetitionNumber is {2, 3, 4, 5, 6, 7, 8, 16}.

Optionally, if the repetitionNumber is configured, the pdsch-AggregationFactor does not need to be configured.

The UE determines the number K of the repetition transmissions of the PDSCH according to the pdsch-AggregationFactor or repetitionNumber configuration. In a case of K>1, the network device uses the same symbol allocation scheme in K consecutive slots to transmit the same transport block (TB) multiple times, and the UE performs reception of the PDSCH in the K consecutive slots.

For uplink data transmission of the Physical Uplink Shared Channel (PUSCH), a pusch-AggregationFactor, a repK, a numberofrepetitions and the like parameters are defined to control the number of repetition transmissions of the PUSCH.

In some scenarios, a value range of the repK is {1, 2, 4, 8}, a value range of the pusch-AggregationFactor is {2, 4, 8}, and a value range of the numberofrepetitions is {1, 2, 3, 4, 7, 8, 12, 16}.

In other scenarios, a maximum number of repetitions is extended. For example, a value range of repK-r17 is {1, 2, 4, 8, 12, 16, 24, 32}, and a value range of numberOfRepetitions-r17 is {1, 2, 3, 4, 7, 8, 12, 16, 20, 24, 28, 32}. Moreover, a new counting method is introduced. For example, repetition transmissions may be counted based on available slots instead of continuous slots. In addition, a TBoMS data transmission method is also introduced.

To facilitate understanding of the embodiments of the present disclosure, repetition transmissions of the control channel in the NR system is explained.

In the NR system, in order to improve the reliability of control information transmission, a control information repetition transmission mechanism is designed.

For example, for Physical Uplink Control Channel (PUCCH) formats 1/3/4, the number of repetition transmissions of the PUCCH may be configured through nrofslots in a PUCCH-FormatConfig.

In the NR system, a timing relationship of scheduling or retransmission of the PDSCH/PUSCH is designed, as shown in FIG. 6.

For example, a terminal device receives a PDCCH of a network device, and the PDCCH is used to schedule a downlink grant (DL grant). The terminal device may receive a PDSCH on the downlink grant at a location of an offset of K0 slots after receiving the PDCCH, and further provide feedback of the PDSCH at a location of an offset of K1 slots after the PDSCH, such as feedback of an Acknowledgement (ACK) or a Negative Acknowledgement (NACK). In a case of the feedback of NACK, the network device may perform the retransmission of the PDSCH after an offset of K3 slots.

As another example, a terminal device receives a PDCCH of a network device, and the PDCCH is used to schedule an uplink grant (UL grant). The terminal device may transmit a PUSCH on the uplink grant at a location of an offset of K2 slots after receiving the PDCCH, and further perform the retransmission of the PUSCH after the PUSCH.

In summary, in order to improve the reliability of data transmission, or to increase the cell coverage performance, a repetition transmission mechanism is introduced in the NR system. However, considering the actual application, the NR system does not support all numbers of repetition transmissions. For example, in some scenarios, for the Dynamic Grant Physical Uplink Shared Channel (DG-PUSCH), the NR system may support repetition transmission times such as {1, 2, 3, 4, 7, 8, 12, 16, 20, 24, 28, 32}, and for the Configured Grant Physical Uplink Shared Channel (CG-PUSCH), the NR system may support repetition transmission times such as {1, 2, 3, 4, 7, 8, 12, 16}.

During actual data transmission, due to different channel conditions, the required number of repetition transmissions is also different. A network device can only configure the number of repetition transmissions as many as possible to ensure the reliability of data transmission. For example, the PUSCH actually needs to be transmitted repeatedly 12 times to achieve the required performance, but the network device may configure the number of repetition transmissions to 16 or 20, which will cause a waste of resources and bring about a greater transmission delay. And under a frame structure of downlink slot, downlink slot, downlink slot, special slot, uplink slot (DDDSU), considering repetition transmissions based on available slots, when the configured number of repetition transmissions is 12 times, a total of 60 slots are required for 12 actual repetition transmissions, and when the configured number of repetition transmissions is 16 or 20, 80 or 100 slots are required for repetition transmissions. The same principle is applied to repetition transmissions of the PDSCH. Currently, the PDSCH may support repetition transmission times such as {2, 3, 4, 5, 6, 7, 8, 16}. When the actual number of repetition transmissions required is greater than 8, the network device can only configure the number of repetition transmissions as 16, which will cause waste of resources and a large transmission delay. Therefore, how to improve the repetition transmission performance is an urgent problem to be solved.

The embodiments of the present disclosure provide a method of wireless communication, and the method includes:

- terminating, by a terminal device, reception of remaining repetition transmissions of a first downlink channel, in a case where the first downlink channel is correctly decoded and a number L of repetition transmissions of the first downlink channel is less than K, where the K represents a configured number of repetition transmissions of the first downlink channel, and the K is a positive integer; and
- transmitting, by the terminal device, first indication information to a network device by back scattering, where the first indication information is used to indicate that the terminal device correctly decodes the first downlink channel.

In some embodiments, the first downlink channel includes at least one of: a physical downlink shared channel (PDSCH), or a physical downlink control channel (PDCCH).

In some embodiments, the first indication information is transmitted by back scattering based on an X-th repetition transmission of the first downlink channel, where L<X≤K, and X is a positive integer.

In some embodiments, the X is predefined, or indicated by the network device, or determined by the terminal device.

In some embodiments, the first indication information is transmitted in a first slot.

In some embodiments, the first slot is determined according to a high-level parameter K1, or the first slot is a slot configured by the network device for transmitting feedback information of the first downlink channel.

In some embodiments, the first slot is a slot in which the terminal device correctly decodes the first downlink channel.

In some embodiments, n the first slot is a P-th slot after a second slot, the second slot is a slot in which the terminal device correctly decodes the first downlink channel, and the P is a positive integer.

In some embodiments, the P is predefined, or indicated by the network device, or determined by the terminal device.

In some embodiments, the first indication information is transmitted on a first back scattering resource.

In some embodiments, the first back scattering resource is a Q-th back scattering resource after the terminal device correctly decodes the first downlink channel, where the Q is a positive integer.

In some embodiments, the Q is predefined, or indicated by the network device, or determined by the terminal device.

In some embodiments, the first back scattering resource is a Y-th back scattering resource after an N-th repetition transmission of the first downlink channel, where the Y is a positive integer.

In some embodiments, the N is predefined, or indicated by the network device, or determined by the terminal device.

In some embodiments, the Y is predefined, or indicated by the network device, or determined by the terminal device.

In some embodiments, the method further includes:

- merging and processing, by the terminal device, each repetition transmission of the first downlink channel to determine whether the first downlink channel is correctly decoded.

In some embodiments, the method further includes:

- merging and processing, by the terminal device, starting from receiving an M-th repetition transmission of the first downlink channel, each repetition transmission of the first downlink channel to determine whether the first downlink channel is correctly decoded.

In some embodiments, the M is predefined, or indicated by the network device, or determined by the terminal device.

In some embodiments, the method further includes:

- merging and processing, by the terminal device, the first downlink channel at a location of an N-th repetition transmission of the K repetition transmissions of the first downlink channel to determine whether the first downlink channel is correctly decoded, where the N takes one or more values.

In some embodiments, the N is predefined, or indicated by the network device, or determined by the terminal device.

In some embodiments, the terminal device includes a back scattering transmitter, and the back scattering transmitter transmits the first indication information by back scattering.

The embodiments of the present disclosure provide a method of wireless communication, and the method includes:

- receiving, by a network device, first indication information transmitted by a terminal device by back scattering, where the first indication information is used to indicate that the terminal device correctly decodes a first downlink channel; and terminating, by the network device, performing remaining repetition transmissions of the first downlink channel.

In some embodiments, the first downlink channel includes at least one of: a physical downlink shared channel (PDSCH), or a physical downlink control channel (PDCCH).

In some embodiments, the X is predefined, or indicated by the network device, or determined by the terminal device.

In some embodiments, the first indication information is transmitted in a first slot.

In some embodiments, the first slot is a slot in which the terminal device correctly decodes the first downlink channel.

In some embodiments, the first slot is a P-th slot after a second slot, the second slot is a slot in which the terminal device correctly decodes the first downlink channel, and the P is a positive integer.