WO2018082677A1 - Wireless communications method and apparatus - Google Patents

Abstract

Provided are a wireless communications method and apparatus. The method comprises: a first terminal determines a downlink subframe format that is used when the first terminal device performs downlink transmission with a network device; and the first terminal device receives, according to the downlink subframe format, a first signal sent by a second terminal device, a subframe format corresponding to the first signal being the downlink subframe format. As such, burden of the terminal device can be reduced, and performance of wireless communication can be improved.

Description

Method and device for wireless communication

The present application claims priority to Chinese Patent Application No. PCT Application No. No. No. No. No. No. No. No.

Technical field

The present application relates to the field of communications and, more particularly, to a method and apparatus for wireless communication.

Background technique

At present, an inter-device communication technology is known. When two terminal devices need to transmit data, one terminal device needs to send request information for requesting establishment of a communication connection between devices to another terminal device, and the format of the request information is a device. The specific format specified by the communication technology is such that the terminal device can recognize that the communication connection to be established is an inter-device communication connection according to the specific format.

Therefore, the prior art inter-device communication technology needs to be established on the basis of transmitting the request information having a specific format, and the transmission of the request information (for example, the generation and identification process) increases the processing load of the terminal device, affecting the The performance of wireless communication.

Summary of the invention

The present application provides a method and apparatus for wireless communication, which can reduce the burden on the terminal device and improve the performance of the wireless communication.

In a first aspect, a method for wireless communication is provided, the method includes: determining, by a first terminal device, a downlink subframe format, where the downlink subframe format is used when downlink transmission is performed between the first terminal device and the network device a frame format, the first terminal device receives the first signal sent by the second terminal device according to the downlink subframe format, and the subframe format corresponding to the first signal is the downlink subframe format.

The transmitting terminal device can transmit the downlink subframe used for the downlink transmission by using the downlink subframe format used by the downlink terminal to transmit the signal for carrying the information that needs to be sent to the receiving terminal device. The format receives the information from the transmitting terminal device, thereby completing the inter-device communication, thereby reducing the processing load of the terminal device and improving the processing information of the terminal device compared to the prior art. The performance of wireless communication.

With reference to the first aspect, in a first implementation manner of the first aspect, the downlink subframe format includes a first downlink subframe format, where the first downlink subframe format is sent by the network device to the first terminal device a subframe format of the downlink reference signal, the first signal includes a first reference signal, the subframe format corresponding to the first reference signal is the first downlink subframe format, and the first terminal device is configured according to the downlink subframe And receiving, by the second terminal device, the first signal, the first terminal device receiving the first reference signal according to the first downlink subframe format, where the method further includes: the first terminal device according to the first Receiving, by a reference signal, the first control channel and/or the first data sent by the second terminal device channel.

The transmitting terminal device can send the reference signal that needs to be sent to the receiving end device according to the subframe format of the downlink reference signal, so that the receiving terminal device can receive the received downlink subframe format used when performing the downlink reference signal transmission. The reference signal of the terminal device of the transmitting end completes the transmission process of the reference signal between the transmitting terminal device and the receiving terminal device, and further, the subsequent communication process can be completed according to the reference signal, thereby being compatible with the network device in the prior art and The communication scheme of the terminal device completes the communication process between devices, and improves the versatility and practicability of the method of wireless communication of the present application.

With reference to the first aspect and the foregoing implementation manner, in a second implementation manner of the first aspect, the first reference signal is generated according to any one of a first cell identifier, a second cell identifier, or a third cell identifier. a reference signal, wherein the first cell identifier is a virtual cell identifier of the first terminal device, and the second cell identifier is a virtual cell identifier allocated by the first terminal device to the second terminal device, the third cell identifier It is a cell identifier of a cell in which the first terminal device and the second terminal device are located together.

By causing the transmitting terminal device to generate the reference signal based on the predetermined virtual cell identifier, the receiving terminal device can identify the identity of the transmitting terminal device according to the predetermined virtual cell identifier, thereby improving the security of the communication.

With reference to the first aspect and the foregoing implementation manner, in a third implementation manner of the first aspect, the downlink subframe format includes a second downlink subframe format, where the second downlink subframe format is sent by the network device a subframe format of a downlink control channel of the terminal device, where the first signal includes a first control channel, a subframe format corresponding to the first control channel is the second downlink subframe format, and the first terminal device is configured according to the downlink The receiving, by the first terminal device, the first control channel, according to the second downlink subframe format, the receiving, by the first terminal device, the first terminal device according to the The first control channel receives the first data channel sent by the second terminal device.

The transmitting terminal device can send the control channel that needs to be sent to the receiving device according to the subframe format of the downlink control channel, so that the receiving terminal device can receive the downlink subframe format used when performing the downlink control channel transmission. The control channel of the transmitting terminal device is completed, thereby completing the transmission process of the control channel between the transmitting terminal device and the receiving terminal device, and further, the subsequent communication process can be completed according to the control channel, thereby being able to utilize the existing network device and the terminal The communication technology of the device completes the communication process between devices, and improves the versatility and practicability of the method of wireless communication of the present application.

With reference to the first aspect and the foregoing implementation manner, in a fourth implementation manner of the first aspect, the second downlink subframe format includes a physical downlink control channel PDCCH, an enhanced physical downlink control channel EPDCCH, and a machine type communication physical downlink control channel. The subframe format of any one of the MPDCCH or the short transmission time interval physical downlink control channel SPDCCH.

With reference to the first aspect and the foregoing implementation manner, in a fifth implementation manner of the first aspect, the scrambling code identifier RNTI carried by the first control channel is a first scrambling code identifier or a second scrambling code identifier, where the A scrambling code identifier is a scrambling code identifier of the first terminal device, and the second scrambling code identifier is a scrambling code identifier allocated by the first terminal device to the second terminal device.

By causing the transmitting terminal device to carry the specified scrambling code identifier in the control channel, the receiving terminal device can identify the identity of the transmitting terminal device according to the predetermined scrambling code identifier, thereby improving the security of the communication.

With reference to the first aspect and the foregoing implementation manner, in a sixth implementation manner of the first aspect, the downlink subframe format is The third downlink subframe format is a subframe format of a downlink data channel that the network device sends to the first terminal device, where the first signal includes a first data channel, and the first data channel The corresponding subframe format is the third downlink subframe format; and the first terminal device receives the first signal sent by the second terminal device according to the downlink subframe format, including: the first terminal device according to the third downlink The subframe format receives the first data channel.

The transmitting terminal device can send the data channel that needs to be sent to the receiving end device according to the subframe format of the downlink data channel, so that the receiving terminal device can receive the downlink subframe format used when performing the downlink data channel transmission. Transmitting a data channel of the terminal device, thereby completing a data channel transmission process between the transmitting terminal device and the receiving terminal device, and further, enabling data transmission based on the data channel, thereby being able to utilize the existing network device and The communication technology of the terminal device completes the communication process between devices, and improves the versatility and practicability of the method of wireless communication of the present application.

In conjunction with the first aspect and the foregoing implementation manner, in a seventh implementation manner of the first aspect, the method further includes: the first terminal device transmitting the first data carried in the first data channel to the network device.

In a second aspect, a method for wireless communication is provided, the method includes: determining, by a second terminal device, a downlink subframe format, where the downlink subframe format is a subframe used when performing downlink transmission between the first terminal device and the network device The second terminal device sends a first signal to the first terminal device according to the downlink subframe format, and the subframe format corresponding to the first signal is the downlink subframe format.

The transmitting terminal device can transmit the downlink subframe used for the downlink transmission by using the downlink subframe format used by the downlink terminal to transmit the signal for carrying the information that needs to be sent to the receiving terminal device. The format receives the information from the transmitting terminal device, thereby completing the inter-device communication, thereby reducing the processing load of the terminal device and improving the processing information of the terminal device compared to the prior art. The performance of wireless communication.

With reference to the second aspect, in a first implementation manner of the second aspect, the downlink subframe format includes a first downlink subframe format, where the first downlink subframe format is sent by the network device to the first terminal device The subframe format of the downlink reference signal, and the second terminal device sends the first signal to the first terminal device according to the downlink subframe format, including: the second terminal device according to the first downlink subframe format, Sending a first reference signal to the first terminal, where the subframe format corresponding to the first reference signal is the first downlink subframe format.

The transmitting terminal device can send the reference signal that needs to be sent to the receiving end device according to the subframe format of the downlink reference signal, so that the receiving terminal device can receive the received downlink subframe format used when performing the downlink reference signal transmission. The reference signal of the terminal device of the transmitting end completes the transmission process of the reference signal between the transmitting terminal device and the receiving terminal device, and further, the subsequent communication process can be completed according to the reference signal, thereby being compatible with the network device in the prior art and The communication scheme of the terminal device completes the communication process between devices, and improves the versatility and practicability of the method of wireless communication of the present application.

With reference to the second aspect and the foregoing implementation manner, in a second implementation manner of the second aspect, the method further includes: the second terminal device, according to the first downlink subframe format, and the first cell identifier, the second cell And generating, by the identifier of the third terminal, the first reference signal, where the first cell identifier is a virtual cell identifier of the first terminal device, and the second cell identifier is that the first terminal device is a virtual cell identifier allocated by the second terminal device, where the third cell identifier is a cell identifier of a cell in which the first terminal device and the second terminal device are located together.

By causing the transmitting terminal device to generate the reference signal based on the specified virtual cell identifier, the receiving terminal device can identify the identity of the transmitting terminal device according to the specified virtual cell identifier, thereby improving communication. safety.

With reference to the second aspect and the foregoing implementation manner, in a third implementation manner of the second aspect, the downlink subframe format includes a second downlink subframe format, where the second downlink subframe format is sent by the network device a subframe format of a downlink control channel of the terminal device, and the second terminal device sends the first signal to the first terminal device according to the downlink subframe format, where the second terminal device is configured according to the second downlink subframe format The first control channel is sent to the first terminal, and the subframe format corresponding to the first control channel is the second downlink subframe format.

The transmitting terminal device can send the control channel that needs to be sent to the receiving device according to the subframe format of the downlink control channel, so that the receiving terminal device can receive the downlink subframe format used when performing the downlink control channel transmission. The control channel of the transmitting terminal device is completed, thereby completing the transmission process of the control channel between the transmitting terminal device and the receiving terminal device, and further, the subsequent communication process can be completed according to the control channel, thereby being able to utilize the existing network device and the terminal The communication technology of the device completes the communication process between devices, and improves the versatility and practicability of the method of wireless communication of the present application.

With reference to the second aspect and the foregoing implementation manner, in a fourth implementation manner of the second aspect, the second downlink subframe format includes a physical downlink control channel PDCCH, an enhanced physical downlink control channel EPDCCH, and a machine type communication physical downlink control channel. The subframe format of any one of the MPDCCH or the short transmission time interval physical downlink control channel SPDCCH.

With reference to the second aspect and the foregoing implementation manner, in a fifth implementation manner of the second aspect, the scrambling code identifier RNTI carried by the first control channel is a first scrambling code identifier or a second scrambling code identifier, where the A scrambling code identifier is a scrambling code identifier of the first terminal device, and the second scrambling code identifier is a scrambling code identifier allocated by the first terminal device to the second terminal device.

By causing the transmitting terminal device to carry the specified scrambling code identifier in the control channel, the receiving terminal device can identify the identity of the transmitting terminal device according to the predetermined scrambling code identifier, thereby improving the security of the communication.

With reference to the second aspect and the foregoing implementation manner, in a sixth implementation manner of the second aspect, the downlink subframe format includes a third downlink subframe format, where the third downlink subframe format is sent by the network device a subframe format of the downlink data channel of the terminal device, and the second terminal device sends the first signal to the first terminal device according to the downlink subframe format, where the second terminal device according to the third downlink subframe format The first data channel is sent to the first terminal device, and the subframe format corresponding to the first data channel is the third downlink subframe format.

The transmitting terminal device can send the data channel that needs to be sent to the receiving end device according to the subframe format of the downlink data channel, so that the receiving terminal device can receive the downlink subframe format used when performing the downlink data channel transmission. Transmitting a data channel of the terminal device, thereby completing a data channel transmission process between the transmitting terminal device and the receiving terminal device, and further, enabling data transmission based on the data channel, thereby being able to utilize the existing network device and The communication technology of the terminal device completes the communication process between devices, and improves the versatility and practicability of the method of wireless communication of the present application.

In combination with the various aspects and various implementations of the various aspects, in another implementation, the first signal is sent by the unlicensed time-frequency resource.

In a third aspect, a method for wireless communication is provided, the method includes: determining, by a first terminal device, a first time period, where the first time period belongs to a first time range, and a start time of the first time range is a first downlink transmission The ending time, and the duration of the first time range is a preset value, the first downlink transmission belongs to downlink transmission performed in a cell to which the first terminal device and the second terminal device belong, and the first downlink Line transmission is in the downlink transmission at the current moment The downlink transmission of the line, or the first downlink transmission is the first downlink transmission after the current time in the downlink transmission; the first terminal device receives the transmission request information sent by the second terminal device in the first time period, The transmission request information is used to indicate that the second terminal device requests to send data to the first terminal device; and the first terminal device receives the second data sent by the second terminal device according to the transmission request information.

By causing the transmitting terminal device and the receiving terminal device to transmit the request information within a predetermined duration after the end of the downlink transmission, and performing inter-device communication with the receiving terminal device based on the request information, the receiving terminal device can detect the time without detecting the terminal device. The information is requested, so that the processing load of the receiving terminal device can be reduced.

With reference to the third aspect, in a first implementation manner of the third aspect, the end time of the first downlink transmission is the last downlink subframe in the downlink burst transmission DL Transmission Burst to which the first downlink transmission belongs The end time of the signal transmission, and there is a time interval between the end time of the first downlink transmission and the end time of the subframe of the last downlink subframe.

With reference to the third aspect and the foregoing implementation manner, in a second implementation manner of the third aspect, the method further includes: the first terminal device sends the second data to the network device.

In a fourth aspect, a method for wireless communication is provided, the method includes: determining, by a second terminal device, a first time period, where the first time period belongs to a first time range, and a start time of the first time range is a first downlink transmission The ending time, and the duration of the first time range is a preset value, where the first downlink transmission belongs to downlink transmission performed in the cell to which the first terminal device and the second terminal device belong, and the first downlink The downlink transmission is the downlink transmission that is being performed at the current time in the downlink transmission, or the first downlink transmission is the first downlink transmission after the current time in the downlink transmission; the second terminal device is in the first time period The first terminal device sends the transmission request information, the transmission request information is used to indicate that the second terminal device requests to send data to the first terminal device, and the second terminal device sends the second data to the first terminal device.

By causing the transmitting terminal device and the receiving terminal device to transmit the request information within a predetermined duration after the end of the downlink transmission, and performing inter-device communication with the receiving terminal device based on the request information, the receiving terminal device can detect the time without detecting the terminal device. The information is requested, so that the processing load of the receiving terminal device can be reduced.

With reference to the fourth aspect, in a first implementation manner of the fourth aspect, the end time of the first downlink transmission is the last downlink subframe in the downlink burst transmission DL Transmission Burst to which the first downlink transmission belongs The end time of the signal transmission, and there is a time interval between the end time of the first downlink transmission and the end time of the subframe of the last downlink subframe.

A fifth aspect, a device for wireless communication, for performing the method of any of the first aspect and the first aspect, or for performing any of the second aspect and the second aspect a method in an implementation, or a method in any one of the possible implementations of the third aspect and the third aspect, or a method in any one of the possible implementations of the fourth aspect and the fourth aspect, In particular, the apparatus for wireless communication may comprise means for performing the method of the first aspect and any one of the possible implementations of the first aspect, or for performing any of the second aspect and the second aspect A unit of a method in an implementation, or a unit for performing the method of any of the third and third possible implementations, or for performing any of the fourth and fourth possible implementations The unit of the method.

In a sixth aspect, an apparatus for wireless communication is provided, comprising a memory and a processor, the memory being for storing a computer program, the processor for calling and running the computer program from the memory, such that the device of the wireless communication performs The method of any one of the possible implementations of the first aspect and the second aspect and the second aspect The method of any one of the possible implementations, or the method of any one of the possible implementations of the third aspect and the third aspect, or the method of any one of the possible implementations of the fourth aspect and the fourth aspect.

In a seventh aspect, a computer program product is provided, the computer program product comprising: computer program code, when the computer program code is received by a terminal device, a processing unit, a transmitting unit or a receiver, a processor, a transmitter In operation, the terminal device is caused to perform the method in any one of the possible implementations of the first to fourth aspects or the first to fourth aspects.

According to an eighth aspect, there is provided a computer readable storage medium storing a program causing a user equipment to perform any one of the first to fourth aspects or the first to fourth aspects The method in the implementation.

In conjunction with the various implementations of the foregoing aspects and aspects, in another implementation manner, the first terminal device is a wearable device, and the second terminal device is a user device.

DRAWINGS

1 is a schematic architectural diagram of a communication system to which a method and apparatus for wireless communication of the present application is applied.

2 is a schematic interaction diagram of an example of a method of wireless communication of the present application.

3 is a schematic interaction diagram of another example of a method of wireless communication of the present application.

4 is a schematic view showing an example of a position of a void period of the present application.

Fig. 5 is a schematic block diagram showing an example of an apparatus for wireless communication of the present application.

6 is a schematic block diagram of another example of an apparatus for wireless communication of the present application.

7 is a schematic block diagram of still another example of the apparatus for wireless communication of the present application.

8 is a schematic block diagram of still another example of the apparatus for wireless communication of the present application.

detailed description

The technical solutions in the present application will be clearly and completely described below in conjunction with the drawings in the present application.

The terms "component," "module," "system," and the like, as used in this specification, are used to mean a computer-related entity, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and a computing device can be a component. One or more components can reside within a process and/or execution thread, and the components can be located on one computer and/or distributed between two or more computers. Moreover, these components can execute from various computer readable media having various data structures stored thereon. A component may, for example, be based on signals having one or more data packets (eg, data from two components interacting with another component between the local system, the distributed system, and/or the network, such as the Internet interacting with other systems) Communicate through local and/or remote processes.

It should be understood that the present application can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (Wideband) Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, general purpose Mobile Communication System (UMTS) or next-generation communication system.

In general, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technologies, mobile communication systems will not only support traditional communication, but also support, for example, device to device (Device to Device, D2D) communication, Machine to Machine (M2M) communication, Machine Type Communication (MTC), and Vehicle to Vehicle (V2V) communication.

The present application describes various embodiments in connection with a terminal device. A terminal device may also be called a user equipment (User Equipment, UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, and a user. Agent or user device. The terminal device may be a station (STAION, ST) in a Wireless Local Area Networks (WLAN), and may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, or a wireless local loop (Wireless Local) Loop, WLL) stations, Personal Digital Assistant (PDA) devices, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, and next-generation communication systems, For example, a terminal device in a fifth-generation (5G) network or a terminal device in a future evolved public land mobile network (PLMN) network.

By way of example and not limitation, in the present application, the terminal device may also be a wearable device. A wearable device, which can also be called a wearable smart device, is a general term for applying wearable technology to intelligently design and wear wearable devices such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are more than just a hardware device, but they also implement powerful functions through software support, data interaction, and cloud interaction. Generalized wearable smart devices include full-featured, large-size, non-reliable smartphones for full or partial functions, such as smart watches or smart glasses, and focus on only one type of application, and need to work with other devices such as smartphones. Use, such as various smart bracelets for smart signs monitoring, smart jewelry, etc.

Moreover, the present application describes various embodiments in connection with a network device. The network device may be a device for communicating with the mobile device, such as a network device, and the network device may be an access point (APCESS POINT, AP) in the WLAN, a base station (Base Transceiver Station, BTS) in GSM or CDMA, or may be A base station (NodeB, NB) in WCDMA may also be an evolved base station (Evolutional Node B, eNB or eNodeB) in LTE, or a relay station or an access point, or an in-vehicle device, a wearable device, and a network in a future 5G network. A device or a network device in a future evolved PLMN network.

In addition, the present application describes various embodiments in conjunction with a cell, which may be a cell corresponding to a network device (for example, a base station), and the cell may belong to a macro base station or a base station corresponding to a small cell, where the small cell may Including: 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 Rate data transfer service.

In addition, multiple carriers can work at the same frequency on the carrier in the LTE system. In some special scenarios, the concept of the carrier and the cell in the LTE system can be considered to be equivalent. For example, in a carrier aggregation (CA) scenario, when a secondary carrier is configured for a UE, the carrier index of the secondary carrier and the cell identifier (Cell ID) of the secondary cell working in the secondary carrier are simultaneously carried. In this case, the concept of the carrier and the cell can be considered to be equivalent, for example, the UE accessing one carrier and accessing one cell are equivalent.

The method and device provided by the present application can be applied to a terminal device or a network device, and the terminal device or network device It includes the hardware layer, the operating system layer running on the hardware layer, and the application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory (also referred to as main memory). The operating system may be any one or more computer operating systems that implement business processing through a process, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer includes applications such as browsers, contacts, word processing software, and instant messaging software. Further, in the present application, the specific configuration of the executor of the method of transmitting a signal is not particularly limited as long as it can pass the program of the code of the method of transmitting the signal of the present application, and the transmission signal according to the present application. The method can be communicated. For example, the execution body of the method for wireless communication of the present application may be a terminal device or a network device, or may be a function module of a terminal device or a network device that can call a program and execute a program.

Furthermore, various aspects or features of the present application can be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used in this application encompasses a computer program accessible from any computer-readable device, carrier, or media. For example, the computer readable medium may include, but is not limited to, a magnetic storage device (eg, a hard disk, a floppy disk, or a magnetic tape, etc.), such as a compact disc (CD), a digital versatile disc (Digital Versatile Disc, DVD). Etc.), smart cards and flash memory devices (eg, Erasable Programmable Read-Only Memory (EPROM), cards, sticks or key drivers, etc.). Additionally, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, without limitation, a wireless channel and various other mediums capable of storing, containing, and/or carrying instructions and/or data.

1 is a schematic diagram of a communication system 100 to which the method and apparatus for wireless communication of the present application is applied. As shown in FIG. 1, the communication system 100 includes a network device 102, which may include one or more antennas. Additionally, network device 102 may additionally include a transmitter chain and a receiver chain, as will be understood by those of ordinary skill in the art, which may include multiple components related to signal transmission and reception (eg, processor, modulator, multiplexer) , demodulator, demultiplexer or antenna, etc.).

Network device 102 can communicate with a plurality of terminal devices, such as terminal device 104 and terminal device 106. However, it will be appreciated that network device 102 can communicate with any number of terminal devices similar to terminal device 104 or 106. The terminal device 104 or 106 can be, for example, a cellular telephone, a smart phone, a portable computer, a handheld communication device, a handheld computing device, a satellite radio, a global positioning system, a PDA, a wearable device, and/or for communicating over the wireless communication system 100. Any other suitable equipment.

For example, network device 102 can transmit information to a terminal device (e.g., terminal device 104 or 106) over a forward link and receive information from the terminal device over a reverse link.

For example, in a Frequency Division Duplex (FDD) system, for example, the forward link can utilize different frequency bands than those used by the reverse link.

As another example, in a Time Division Duplex (TDD) system and a Full Duplex system, a common frequency band can be used for the forward link and the reverse link.

Each antenna (or set of antennas consisting of multiple antennas) and/or regions designed for communication is referred to as a sector of network device 102. For example, the antenna group can be designed to communicate with terminal devices in sectors of the network device 102 coverage area. In the process in which the network device 102 communicates with the terminal device through the forward link, respectively, the transmit antenna of the network device 102 can utilize beamforming to improve the signal to noise ratio of the forward link. In addition, with the network device through a single antenna to it In contrast to the manner in which a terminal device transmits a signal, when the network device 102 transmits a signal to a terminal device that is randomly dispersed in the relevant coverage region by using beamforming, the mobile device in the adjacent cell may be less interfered.

At a given time, network device 102, terminal device 104, or terminal device 106 may be a wireless communication transmitting device and/or a wireless communication receiving device. When transmitting data, the wireless communication transmitting device can encode the data for transmission. In particular, the wireless communication transmitting device may acquire (eg, generate, receive from other communication devices, or store in memory, etc.) a certain number of data bits to be transmitted over the channel to the wireless communication receiving device. Such data bits may be included in a transport block (or multiple transport blocks) of data that may be segmented to produce multiple code blocks.

In addition, the communication system 100 can be a PLMN network or a D2D network or an M2M network or other network. FIG. 1 is only a simplified schematic diagram of an example, and other network devices may also be included in the network, which are not shown in FIG.

It should be noted that, in the present application, the first terminal device may be one of the terminal device 104 or the terminal device 106, and the second terminal device may be the other of the terminal device 104 or the terminal device 106.

By way of example and not limitation, in the present application, the types of the first terminal device and the second terminal device may be different, for example, the first terminal device may be a smart phone, and the second terminal device may be a wearable device.

In addition, in the present application, the communication capabilities of the first terminal device and the second terminal device may be the same or different. For example, the transmission power of the second terminal device may be lower than the transmission power of the first terminal device.

It should be understood that the specific conditions of the first terminal device and the second terminal device listed above are only exemplary descriptions, and the present application is not particularly limited. For example, the types of the first terminal device and the second terminal device may also be the same, for example, The first terminal device and the second terminal device may both be smart phones, or the communication capabilities of the first terminal device and the second terminal device may be the same. For example, the transmit powers of the first terminal device and the second terminal device may be the same.

Hereinafter, time-frequency resources for wireless communication used by the communication system 100 will be described in detail.

In the present application, time-frequency resources used by the communication system 100 (eg, time-frequency resources used for communication between the network device 102 and the terminal device 104 or 106, and/or between the terminal device 104 and the terminal device 106) The adaptation resource used by the communication may be an authorized time-frequency resource or an unlicensed time-frequency resource, or, in the present application, each communication device (for example, a network device or a terminal device) in the communication system 100 may be based on The unlicensed transmission scheme uses time-frequency resources for communication, and can also communicate using time-frequency resources based on an authorization method, which is not specifically limited in this application.

The unlicensed time-frequency resource means that no communication is required, and each communication device can share the resources included in the unlicensed time-frequency domain. Resource sharing on the unlicensed band means that the use of a specific spectrum only specifies the limits of the transmit power and out-of-band leakage to ensure that the basic coexistence requirements are met between multiple devices sharing the band. The licensed band resources can achieve the purpose of network capacity shunting, but need to comply with the regulatory requirements of the unlicensed band resources in different geographies and different spectrums. These requirements are usually designed to protect public systems such as radar, as well as to ensure that multiple systems do not cause harmful effects and fair coexistence with each other, including emission power limits, out-of-band leak indicators, indoor and outdoor use restrictions, and areas. There are also some additional coexistence strategies and so on. For example, each communication device can adopt a contention mode or a monitoring mode, for example, a time-frequency resource used in a manner specified by Listening Before Talk (LBT).

In order to solve a large number of MTC-type services in the future network, and to meet low-latency, highly reliable service transmission, this patent proposes a scheme for unauthorized transmission. Unauthorized transmission of English can be expressed as Grant Free. The unlicensed transmission here can be for uplink data transmission. An unauthorized transfer can be understood as any of the following meanings, or multiple meanings, or a combination of some of the various technical features or other similar meanings:

Unauthorized transmission may mean that the network device pre-allocates and informs the terminal device of multiple transmission resources; the terminal device has When the data transmission request is required, at least one transmission resource is selected from a plurality of transmission resources pre-allocated by the network device, and the uplink data is sent by using the selected transmission resource; and the network device is one or more of the plurality of pre-assigned transmission resources. The uplink data sent by the terminal device is detected on the transmission resources. The detection may be blind detection, or may be performed according to one of the control domains in the uplink data, or may be detected in other manners.

The unlicensed transmission may be: the network device pre-allocates and informs the terminal device of multiple transmission resources, so that when the terminal device has an uplink data transmission requirement, at least one transmission resource is selected from a plurality of transmission resources pre-allocated by the network device, and the selected one is used. The transmission resource sends uplink data.

The unlicensed transmission may be: acquiring information of a plurality of pre-assigned transmission resources, selecting at least one transmission resource from the plurality of transmission resources when there is an uplink data transmission requirement, and transmitting the uplink data by using the selected transmission resource. The method of obtaining can be obtained from a network device.

The unlicensed transmission may be a method for realizing uplink data transmission of the terminal device without dynamic scheduling of the network device. The dynamic scheduling may refer to the network device indicating the transmission resource by signaling for each uplink data transmission of the terminal device. A scheduling method. Optionally, implementing uplink data transmission of the terminal device may be understood as allowing data of two or more terminal devices to perform uplink data transmission on the same time-frequency resource. Optionally, the transmission resource may be one or more transmission time units of transmission resources after the time when the UE receives the signaling. A transmission time unit may refer to a minimum time unit for one transmission, such as a Transmission Time Interval (TTI), the value may be 1 ms, or 0.5 ms, or may be a preset transmission time unit.

Unauthorized transmission can mean that the terminal device performs uplink data transmission without requiring authorization of the network device. The authorization may be performed by the terminal device sending an uplink scheduling request to the network device. After receiving the scheduling request, the network device sends an uplink grant to the terminal device, where the uplink grant indicates the uplink transmission resource allocated to the terminal device.

The unlicensed transmission may refer to: a contention transmission mode, which may specifically mean that multiple terminals simultaneously perform uplink data transmission on the same time-frequency resources allocated in advance without the base station performing authorization.

The data may be included in service data or signaling data.

The blind detection can be understood as the detection of data that may arrive without predicting whether or not data has arrived. The blind detection can also be understood as detection without explicit signaling indication.

By way of example and not limitation, in the present application, the unlicensed spectrum resource may include a frequency band near 5 GHz, or a frequency band near 2.4 GHz, or a frequency band near 3.5 GHz, or a frequency band near 60 GHz.

By way of example and not limitation, for example, the communication system 100 may employ a Licensed-Assisted Access Using LTE (LAA-LTE) technology on an unlicensed carrier, or may support the independent deployment of the communication system in an unlicensed band. Technology such as Standalone LTE over unlicensed spectrum, or LTE Advanced In Unlicensed Spectrums (LTE-U) technology, that is, the communication system 100 can independently deploy the LTE system to an unlicensed band, and The LTE air interface protocol is used to complete the communication on the unlicensed band. The system does not include the licensed band. The LTE system deployed in the unlicensed band can utilize technologies such as centralized scheduling, interference coordination, and Hybrid Automatic Repeat reQuest (HARQ), and access technologies such as Wi-Fi, which has better robustness. For higher spectral efficiency, greater coverage and a better user experience.

Moreover, by way of example and not limitation, in the present application, the communication system 100 may employ, for example, Licensed-Assisted Access (LAA), Dual Connectivity (DC), and unauthorized access (Standalone). Technology, etc. Among them, the LAA includes utilizing carrier aggregation (carrier in the existing LTE system)

The configuration and structure of Aggregation (CA) are based on the configuration of carrier (authorized carrier) on the carrier-licensed band, and the carriers on multiple unlicensed bands are configured (unlicensed carrier) and the authorized carrier is used for auxiliary use. The carrier communicates. That is, the LTE device can use the authorized carrier as the primary component carrier (PCC) or the primary cell (PCell) in the CA mode, and use the unlicensed carrier as the secondary component carrier (SCC). Or secondary cell (Secondary Cell, SCell). The dual-connected DC technology includes a technology in which an authorized carrier and an unlicensed carrier are jointly used in a non-CA (or non-ideal backhaul) manner, or a technique in which a plurality of unlicensed carriers are jointly used in a non-CA manner. LTE devices can also be deployed directly on unlicensed carriers through independent deployment.

By way of example and not limitation, in the present application, the first terminal device may be a terminal device supporting LAA technology.

Moreover, in the present application, each communication device in the communication system 100 can also perform wireless communication using licensed spectrum resources, that is, the communication system 100 of the present application is a communication system capable of using licensed bands.

Authorized time-frequency resources generally require time-frequency resources that can be used by national or local wireless committees for approval. Different systems, such as LTE systems and WiFi systems, or systems included by different operators may not share authorized time-frequency resources.

Additionally, in the present application, the network device can provide one or more unlicensed cells (or, also referred to as unlicensed carriers), and one or more authorized cells (or, alternatively, can also be referred to as authorized carriers).

In the present application, wireless communication (for example, transmission of a signal or a channel) can be performed between the first terminal device and the second terminal device. Hereinafter, the first terminal device and the second terminal device are combined with FIG. 2 and FIG. The wireless communication process is described in detail.

FIG. 2 shows a schematic interaction diagram of a communication method 200 between a first terminal device and a second terminal device.

As shown in FIG. 2, in the present application, the terminal device #A (ie, an example of the first terminal device) can perform wireless communication with the network device based on the solution provided by the prior art, for example, in the present application, the network device and The terminal device #A can perform downlink transmission using the downlink subframe format #A (that is, an example of the downlink subframe format). Moreover, the downlink transmission process between the terminal device #A and the network device may be similar to the prior art, and a detailed description thereof is omitted herein to avoid redundancy.

Thus, at S210, the terminal device #A can learn the downlink subframe format #A.

Hereinafter, the "downlink subframe format" in the present application will be exemplified.

By way of example and not limitation, in the present application, "downlink subframe format" may include the following parameters or information.

A. Mapping of downlink signals or downlink channels.

Specifically, in the present application, the “downlink subframe format” may refer to a manner in which a downlink signal (eg, a downlink reference signal) or a downlink channel (eg, a downlink control channel or a downlink data channel) is mapped on a time-frequency resource. By way of example and not limitation, for example, the “map mode” may refer to a time-frequency location of a time-frequency resource for carrying a downlink signal or a downlink channel in one TTI. For example, the “mapping mode” may refer to a time domain location used to carry a downlink signal or a downlink channel in a radio frame (eg, including an uplink subframe and a downlink subframe), or a configuration pattern. For another example, the “mapping mode” may refer to a transmission period of the downlink signal, or a transmission interval.

B. Structure of the downlink subframe.

For example, in the present application, the downlink subframe format may refer to a downlink signal (eg, a downlink reference signal) or a downlink subframe (eg, a downlink control channel or a downlink data channel). For example, the lengths of subframes of different downlink subframe formats may be different.

For example, in the present application, the downlink subframe format may refer to a time slot division manner of a downlink subframe (for example, a downlink reference signal) or a downlink channel (for example, a downlink control channel or a downlink data channel). Or the symbol division manner, or the downlink subframe format may refer to a downlink signal (for example, a downlink reference signal) or a time slot included in a downlink subframe (for example, a downlink control channel or a downlink data channel) The number of symbols. For example, different communication systems, or different services, have different requirements for data transmission delay. Therefore, in the present application, multiple downlink subframe formats with different subframe lengths may be provided. By way of example and not limitation, in the present application, for example, subframes of different downlink subframe formats may include different numbers of slots, and for example, subframes of different downlink subframe formats may include different numbers of symbols. .

As an example and not by way of limitation, for example, as a downlink subframe format for DRS, it may be used to indicate a transmission period of the DRS (for example, may be configured as 40, 80 or 160 ms), and may also be used to indicate the length of one DRS burst ( For example, it can be configured to be 1 to 5 ms for FDD and 2 to 5 ms for TDD, and can also be used to indicate a DRS subframe in which a synchronization signal is present in one DRS burst. It should be noted that, in the LAA system, the DRS subframe in which the synchronization signal is located in one DRS burst may include only the first 12 symbols of the subframe. The DRS includes a primary synchronization signal PSS, a secondary synchronization signal SSS, and a common reference signal CRS with an antenna port of 0. Optionally, the DRS may further include a channel state information reference signal CSI-RS with an antenna port of 15.

C. Transmission time of the downlink subframe.

For example, in the present application, the downlink subframe format may refer to a downlink signal (eg, a downlink reference signal) or a transmission time of a downlink subframe carried by a downlink channel (eg, a downlink control channel or a downlink data channel). For example, in the present application, the sending moment of the downlink subframe may be a subframe boundary or a slot boundary or a symbol boundary of the downlink signal sent by the network device. For example, in this application, the sending moment of the downlink subframe may be a subframe boundary or a slot boundary or a symbol boundary of a subframe in a Discovery Signals Measurement Timing Configuration (DMTC) window configured by the network device. .

It should be understood that the definition or use of the "downlink subframe format" listed above, and the specific parameters or information included in the "downlink subframe format", and the transmission timing of the "downlink subframe format" are merely exemplary descriptions. The application is not limited to this, and the definition of the "downlink subframe format" may also be similar to the prior art. For example, the definition of "downlink subframe format" may be a definition defined in an existing communication protocol, or "downstream" The parameters or information included in the "subframe format" may also be parameters or information specified in an existing communication protocol.

It should be noted that, according to the type of the signal transmitted by the network device and the terminal device #A in the downlink transmission process, the downlink subframe format #A may also be changed, that is, by way of example and not limitation, in the present application. The downlink subframe format #A may include at least one of the following formats:

The downlink subframe format of the downlink reference signal (that is, an example of the first downlink subframe format, which is hereinafter referred to as downlink subframe format #A-1) for ease of understanding and differentiation;

2. The downlink subframe format corresponding to the downlink control channel (that is, an example of the second downlink subframe format, which is hereinafter referred to as downlink subframe format #A-2) for ease of understanding and differentiation;

3. The downlink subframe format corresponding to the downlink data channel (that is, an example of the third downlink subframe format, which is hereinafter referred to as downlink subframe format #A-3) for ease of understanding and differentiation.

As shown in FIG. 2, when the terminal device #B (ie, an example of the second terminal device) needs to transmit a signal or channel (ie, an example of the first signal) to the terminal device #A, the terminal device #B may Determine the downlink subframe format #A.

By way of example and not limitation, for example, in the present application, the downlink subframe format #A may be a system or a communication protocol. Therefore, the terminal device #B can determine the downlink according to the system or the communication protocol (for example, the related information of the downlink subframe format #A is configured in the terminal device #B by the manufacturer or the operator in advance). Subframe format #A.

For example, in the present application, the terminal device #B may be a terminal device that has accessed the cell provided by the network device, or the terminal device #B may be a terminal device located within the coverage of the network device, that is, the terminal device. Device #B can receive the information sent by the network device. Therefore, for example, the network device may send the indication information (indicated as the first indication information) of the downlink subframe format #A to the terminal device #B, and the terminal device #B may determine the downlink subframe according to the first indication information. Format #A. For another example, the terminal device #B can monitor the downlink signal sent by the network device to the terminal device #A (hereinafter, for ease of understanding and differentiation, it is recorded as: downlink signal #β), and then the sub-carrier for carrying the downlink signal #β The format of the frame is determined as the downlink subframe format #A. It should be noted that the downlink signal #β may include one or more of a downlink reference signal, a downlink control channel, or a downlink data channel.

For another example, in the present application, the user of the terminal device #B can input the related information of the downlink subframe format #A to the terminal device #B.

It should be understood that the method and process of determining the downlink subframe format #A by the terminal device #B enumerated above are only exemplary descriptions, and the application is not limited thereto, and those skilled in the art may determine the terminal device #B according to actual conditions. The method and procedure of the downlink subframe format #A are appropriately changed as long as the terminal device #B can learn the downlink subframe format #A.

As an example and not by way of limitation, the method further includes:

The second terminal device determines the downlink subframe format according to the type of the first signal that needs to be sent.

Specifically, in the present application, the terminal device #B may further determine the used downlink subframe format according to the type of the signal (or channel) to be transmitted, for example:

If the first signal includes a reference signal (ie, an example of the first reference signal), the second terminal device may determine that the first signal needs to be transmitted according to the downlink subframe format #A-1 (specifically, the first reference) signal);

If the first signal includes a control channel (ie, an example of the first control channel), the second terminal device may determine that the first signal needs to be transmitted according to the downlink subframe format #A-2 (specifically, the first control) channel);

If the first signal includes a data channel (ie, an example of the first data channel), the second terminal device may determine that the first signal (specifically, the first data) needs to be transmitted according to the downlink subframe format #A-3. channel).

At S220, the terminal device #A and the terminal device #B (ie, an example of the second terminal device) may perform wireless communication according to the downlink subframe format #A, for example, the terminal device #A may be in carrier #A (specifically Is the transmission signal #α (or channel #α) in the time domain range corresponding to the downlink subframe format in carrier #A.

By way of example and not limitation, for example, the terminal device #B may map the signal #α on the time-frequency resource based on the mapping manner corresponding to the downlink subframe format #A, and the terminal device #A may map based on the downlink subframe format #A. The method obtains the signal #α from the time-frequency resource, and the “mapping mode” may refer to the location of the time-frequency resource for carrying the signal #α indicated by the downlink subframe format #A, for example, the downlink subframe format# The position of the symbol used to carry the signal #α in the TTI indicated by A in the TTI.

In the present application, the object transmitted by the terminal device #A and the terminal device #B according to the downlink subframe format #A may include a reference signal (ie, case 1), and may also include a control channel (ie, case 2). The data channel (ie, Case 3) may be included. In the following, the wireless communication processes in the above three cases are separately described in detail.

Situation 1

Specifically, in the present application, the terminal device #B can have a downlink subframe format #A (specifically, a downlink subframe) Format #A-1), for example, on the carrier A, transmits a reference signal to the terminal device #A (that is, an example of the first reference signal, hereinafter, for ease of understanding and distinction, it is noted as: reference signal #α-1) .

The reference signal (RS) may also be referred to as a pilot signal (Pilot Signal), which is provided by the transmitting device (for example, the terminal device #B described above) to the receiving device (for example, the terminal device #A). A known signal for channel estimation, channel measurement, channel sounding or channel demodulation, and the like. In the present application, the reference signal can be applied to the physical layer without carrying data information from higher layers.

As an example and not by way of limitation, in the present application, reference signal #α-1 may include at least one of the following reference signals:

Cell-specific Reference Signal (CRS), UE-specific Reference Signal (UE-RS), Channel State Information-Reference Signals (CSI-RS), Group-specific Reference Signal (GRS), Positioning Reference Signal (Positioning RS, PRS), Beam Reference Signal (BRS), Wavelet Refinement Reference Signal (Beam refinement) Reference signal (BRRS), phase compensation reference signal (PCRS), primary synchronization signal (PSS), secondary synchronization signal (SSS), or discovery reference signal (Discovery reference signal, DRS, also known as Discovery signal) and so on. The UE-RS may also be referred to as a Demodulation Reference Signal (DMRS).

In addition to the reference signal, the transmission object between the terminal device #A and the terminal device #B may also be a sequence signal in a sequence signal set having good correlation characteristics. The good correlation characteristic is that any one of the sequences has a large autocorrelation peak, and any two sequences in the set have smaller cross-correlation peaks. That is, in the present application, a plurality of signals may be transmitted between the terminal device #A and the terminal device #B, wherein at least one of the signals is a sequence signal having the above-described good correlation, such as a pseudo random sequence or a suffolk (Zadoff-chu) sequence.

Also, by way of example and not limitation, for example, when the terminal device #B transmits the reference signal #α-1 using an unlicensed band (or an unlicensed time-frequency resource), or when the carrier #A is in the When the carrier on the licensed band is licensed, the terminal device #B can listen before the signal transmission on the unlicensed band (for example, carrier #A), and the interception result is available for the current carrier #A (or When the resource on the current carrier #A is not occupied by other devices, the reference signal #α-1 is transmitted using the carrier #A based on the downlink subframe format #A-1, for example, the terminal device #B can use the reference signal. #α-1 is carried on the symbol for carrying the reference signal indicated by the downlink subframe format #A-1 on the carrier #A.

It should be understood that the method and process for transmitting the reference signal #α-1 based on the downlink subframe format #A-1 listed above by the terminal device #B are merely exemplary, and the present application is not limited thereto, for example, the terminal device #B The reference signal #α-1 may also be transmitted on the licensed spectrum based on the downlink subframe format #A-1.

Correspondingly, the terminal device #A can detect whether there is signal transmission on the carrier #A based on the downlink subframe format #A-1, for example, by using a blind detection mode, so that the terminal device #B can transmit the message transmitted by the carrier #A. Reference signal #α-1.

It should be noted that the reference signal #α-1 may be one or more reference signals of DRS, PSS, SSS or CRS. For example, the reference signal #α-1 may include a CRS, or the reference signal #α-1 may include a PSS or an SSS, or the reference signal #α-1 may include a PSS or an SSS, and a CRS, or, reference signal #α- 1 may include PSS, SSS, and CRS, or reference signal #α-1 may include DRS.

In the present application, the reference signal #α-1 may have a mapping relationship with the terminal device #B or the terminal device #A. That is, the terminal device #A can perform a prescribed process on the reference signal #α-1 to determine whether to use the reference signal #α-1, for example, to determine whether or not to base the reference signal #α-1 with the terminal device #B Further communication (eg, synchronization, control channel transmission, or data channel transmission, etc.).

Therefore, by way of example and not limitation, in the present application, the reference signal #α-1 may be generated by the terminal device #B in the following manner.

Mode 1

By way of example and not limitation, in the present application, for example, the terminal device #A may authenticate the terminal device B, whereby the terminal device #A may determine that it is necessary to be based on the reference signal transmitted by the terminal device #B. The reference signal is further communicated (eg, synchronization, control channel transmission, or data channel transmission, etc.).

In addition, the terminal device #B can obtain the virtual cell identifier of the terminal device #A in advance, for example, in the above-mentioned authentication process (that is, an example of the first cell identifier, hereinafter, for ease of understanding and differentiation, it is recorded as: cell identifier #1 For example, the terminal device #A may transmit the virtual cell identity (ie, cell identity #1) of the terminal device #A to the terminal device #B in advance.

The terminal device #B can generate the reference signal #α-1 according to the virtual cell identifier (ie, cell identification #1) of the terminal device #A. Here, the method and process for the terminal device #B to generate the reference signal according to the virtual cell identifier may be similar to the prior art, and a detailed description thereof is omitted in order to avoid redundancy.

Thereby, the terminal device #A can generate the reference signal #α-1 according to the virtual cell identifier, and detect the received signal based on the reference signal #α-1, and determine whether the reference signal #α-1 is received. If the terminal device #A receives the reference signal #α-1, it may be determined that the reference signal #α-1 is generated based on the cell identifier #1, and further, the terminal device #A may determine that the reference needs to be based on the reference based on the cell identifier #1. Signal #α-1 performs further communication with terminal device #B (e.g., synchronization, control channel transmission or data channel transmission, etc.).

Here, the process in which the terminal device #A determines the virtual cell identifier corresponding to the reference signal may be a process in which the terminal device #A performs blind detection on the received signal according to the virtual cell identifier, and the terminal device #A determines the virtual cell identifier corresponding to the reference signal. The method and process may be similar to the prior art, and a detailed description thereof will be omitted in order to avoid redundancy.

Mode 2

By way of example and not limitation, in the present application, for example, the terminal device #A may authenticate the terminal device B, whereby the terminal device #A may determine that it is necessary to be based on the reference signal transmitted by the terminal device #B. The reference signal is further communicated (eg, synchronization, control channel transmission, or data channel transmission, etc.).

Furthermore, the terminal device #A may allocate a virtual cell identifier for indicating the terminal device #B (that is, an example of the second cell identifier, for example, in order to facilitate understanding and distinction, for the terminal device B, for example, in the above-described authentication process. Do: Community ID #2).

The terminal device #B can generate the reference signal #α-1 according to the cell identifier #2.

Thereby, the terminal device #A can generate the reference signal #α-1 according to the cell identification #2, and detect the received signal based on the reference signal #α-1, and determine whether or not the reference signal #α-1 is received. If the terminal device #A receives the reference signal #α-1, it may be determined that the reference signal #α-1 is generated based on the cell identifier #2, and further, the terminal device #A may determine that the reference needs to be based on the reference based on the cell identifier #2. Signal #α-1 performs further communication with terminal device #B (e.g., synchronization, control channel transmission or data channel transmission, etc.).

Mode 3

By way of example and not limitation, in the present application, for example, terminal device #A may authenticate terminal device B, Thus, the terminal device #A can determine that further communication (eg, synchronization, control channel transmission, data channel transmission, etc.) needs to be performed based on the reference signal after receiving the reference signal transmitted by the terminal device #B.

For example, when the terminal device #A and the terminal device #B are located in the same cell, the terminal device #A may determine that further communication based on the reference signal is required after receiving the reference signal transmitted by the terminal device #B.

In this case, the authentication process may be performed together with the transmission process of the reference signal. For example, when the terminal device #A and the terminal device #B are located in the same cell, the terminal device #B may be based on the terminal device #A and the terminal device #B. The identifier of the cell that is in common (that is, an example of the third cell identifier, hereinafter, for ease of understanding, cell ID #3) generates the reference signal #α-1.

Thereby, the terminal device #A can generate the reference signal #α-1 according to the cell identification #3, and detect the received signal based on the reference signal #α-1, and determine whether the reference signal #α-1 is received. If the terminal device #A receives the reference signal #α-1, it may be determined that the reference signal #α-1 is generated based on the cell identifier #3, and further, the terminal device #A may determine that the reference needs to be based on the reference based on the cell identifier #3. Signal #α-1 performs further communication with terminal device #B (e.g., synchronization, control channel transmission or data channel transmission, etc.).

In summary, in the present application, the first reference signal may be generated according to the first virtual cell identifier.

The first virtual cell identifier may be notified by the first terminal device to the second terminal device.

For example, the first virtual cell identifier may be a virtual cell identifier of the first terminal device, that is, when the first terminal device and the plurality of second terminal devices are connected, the first terminal device may use the virtual cell of the first terminal device The identification is notified to a plurality of second terminal devices.

For example, the first virtual cell identifier may be a virtual cell identifier of the second terminal device, that is, when the first terminal device and the plurality of second terminal devices are connected, the first terminal device may be each second terminal device. Assign a proprietary virtual cell identity.

For example, the first virtual cell identifier may be a cell identifier of a cell where the first terminal device and the second terminal device are located, that is, when the first terminal device and the plurality of second terminal devices are connected, the first terminal device may The cell identifier of the cell in which it is located is notified to a plurality of second terminal devices.

That is to say, before the first terminal device and the second terminal device perform data transmission, the first terminal device and the second terminal device have an authentication process. The authentication process can be one-off or periodic. In this case, the first terminal device only needs to blindly detect a specific reference signal generated based on the specific virtual cell identity.

It should be noted that, if the first virtual cell identifier is the cell identifier of the cell where the first terminal device and the second terminal device are located, the manner in which the second terminal device obtains the first virtual cell identifier may be that the second terminal device is configured according to the cell in the second The downlink signal determines the cell identity of the cell in which it is located.

It should be noted that, in this application, the first terminal device and the second terminal device may be in the same cell, and the first reference signal sent by the second terminal device may be sent with the network device of the cell where the first terminal device is located. The reference signals are the same. In this case, the first terminal device only needs to blindly check a reference signal, thereby reducing the complexity of blind detection. It should be noted that the present application does not limit that the first terminal device and the second terminal device must be in the same cell.

Situation 2

Specifically, in the present application, the terminal device #B can transmit the control in the downlink subframe format #A (specifically, the downlink subframe format #A-2), for example, on the carrier A, to the terminal device #A. The channel (i.e., an example of the first control channel, hereinafter, for ease of understanding and differentiation, is referred to as: control channel #α-2).

The control channel can be used to transmit signaling. Specifically, the control channel can be used to schedule transmission of the data channel. For example, the control channel is used to indicate at least one of the following information:

Modulation and coding scheme (MCS) of data channel, resource allocation of data channel, Hybrid Automatic Repeat reQuest (HARQ) process number, redundancy version, new data indication, pre- The coding matrix indicator (PMI), the rank indication (RI), the antenna port, the downlink assignment indication (Downlink Assignment Index), and the power control of the HARQ-ACK feedback corresponding to the data channel.

Optionally, the downlink subframe format #A-2 may be a subframe format of a control channel of the cell where the terminal device #A is located (or a control channel that the network device sends to the terminal device #A).

The control channel of the cell where the terminal device #A is located may be any one of the following control channels:

Physical Downlink Control Channel (PDCCH), Enhanced Physical Downlink Control Channel (EPDCCH), Machine Type Communication Physical Downlink Control Channel (MPDCCH), or short transmission time Any one of a Short Transmission Time Interval Physical Downlink Control Channel (SPDCCH).

In addition, the downlink subframe format #A-2 may be any one of a subframe format corresponding to the PDCCH, a subframe format corresponding to the EPDCCH, a subframe format corresponding to the MPDCCH, or a subframe format corresponding to the SPDCCH. For example, the terminal device #B may transmit the control channel #α-2 using the carrier #A based on the downlink subframe format #A-2, for example, the terminal device #B may map the control channel #α-2 to the carrier #A On the symbol corresponding to the control channel indicated by the downlink subframe format #A-2.

Correspondingly, the terminal device #A can detect whether there is a control channel transmission of the terminal device #B on the carrier #A based on the downlink subframe format #A-2, for example, by using a blind detection mode, so that the terminal device #B can be acquired. Control channel sent by carrier #A.

In the present application, there may be a case where a plurality of terminal devices including the terminal device #B collectively use the carrier #A to transmit a control channel. In this case, the terminal device #A needs to be carried from the carrier #A. The control channel that needs to be acquired (ie, the control channel transmitted by the terminal device #B) is identified in the channel.

For example, in the present application, the control channel #α-2 may have a mapping relationship with the terminal device #B or the terminal device #A, that is, the terminal device #A can perform predetermined processing on the control channel #α-2. To determine whether to use the control channel #α-2, for example, to determine whether to perform further communication (e.g., synchronization, control channel transmission, data channel transmission, etc.) with the terminal device #B based on the control channel #α-2.

By way of example and not limitation, in the present application, the terminal device #A can perform the specified processing on the control channel #α-2, which may include: the terminal device #A determines whether the control channel #α-2 carries the specified interference. Code identification.

Also, by way of example and not limitation, in the present application, the above-mentioned "specified scrambling code identification" may include the following scrambling code identification.

1. The scrambling code identifier of terminal device #A

By way of example and not limitation, in the present application, for example, the terminal device #A may authenticate the terminal device B, whereby the terminal device #A may determine that it is necessary to be based on the control channel transmitted by the terminal device #B. The control channel performs further communication (eg, data channel transmission, etc.).

And, the terminal device #B can know the scrambling code identifier of the terminal device #A in advance, for example, in the above authentication process. (ie, an example of the first scrambling code identifier, hereinafter, for ease of understanding and distinction, denoted as: scrambling code identification #1), for example, the terminal device #A may identify the scrambling code of the terminal device #A (ie, The scrambling code identification #1) is transmitted to the terminal device #B in advance. Here, the scrambling code identifier may include a Radio Network Tempory Identity (RNTI), and the RNTI is an identifier of the terminal device that is internally transmitted between the terminal device and the UTRAN. As an example and not by way of limitation, the scrambling code identifier #1 may be a cell RNTI (Cell RNTI, C-RNTI) of the terminal device #A, or a semi-persistent scheduling cell RNTI (SPS) of the terminal device #A (Semi-Persistent Scheduling Cell RNTI, SPS) C-RNTI) is either a paging RNTI (Paging RNTI, P-RNTI) of the terminal device #A or a secondary link RNTI (Sidelink RNTI, SL-RNTI) of the terminal device #A.

The terminal device #B may carry the scrambling code identification of the terminal device #A (ie, the scrambling code identification #1) on the control channel #α-2.

Thus, the terminal device #A blindly detects whether or not the control channel #α-2 exists based on the scrambling code identification #1. If the terminal device #A detects the control channel #α-2, the terminal device #A may determine that it is necessary to perform further communication (for example, data channel transmission based on the control channel #α-2 with the terminal device #B based on the scrambling code identification #1. Wait).

2. The scrambling code identifier assigned by terminal device #A to terminal device #B

By way of example and not limitation, in the present application, for example, the terminal device #A may authenticate the terminal device B, whereby the terminal device #A may determine that it is necessary to be based on the control channel transmitted by the terminal device #B. The control channel performs further communication (eg, data channel transmission, etc.).

And, in the above-mentioned authentication process, the terminal device #A may allocate a scrambling code identifier for indicating the terminal device #B to the terminal device B (that is, an example of the second scrambling code identifier, hereinafter, for ease of understanding and distinction, Remember to do: Scrambling code identification #2).

The terminal device #B can carry the scrambling code identification #2 on the control channel #α-2.

Thus, the terminal device #A blindly detects whether or not the control channel #α-2 exists based on the scrambling code identification #2. If the terminal device #A detects the control channel #α-2, the terminal device #A may determine that it is necessary to perform further communication (for example, data channel transmission based on the control channel #α-2 with the terminal device #B based on the scrambling code identification #2. Wait).

It should be noted that the authentication process mentioned in the foregoing case 1 and the case 2 may be implemented by one authentication process, or may be implemented by different authentication processes, which is not specifically limited.

That is, in the present application, when a plurality of terminal devices including the second terminal device jointly use the unlicensed carrier to transmit the control channel, the first terminal device needs to receive the control channel transmitted by the authenticated second terminal device. In this case, the second terminal device may carry the specified identification information (for example, the above-mentioned scrambling code identification #1 or scrambling code identification #2) in the transmitted control channel. It should be noted that the first control channel may be demodulated using the first reference signal. The first control channel can also be demodulated using a terminal device-specific reference signal.

In addition, in the present application, the transmission of the control channel #α-2 may be performed on the basis of the transmission of the reference signal #α-1, or the transmission of the control channel #α-2 may also be independent of The transmission of the reference signal #α-1 is not particularly limited in the present application.

Situation 3

Specifically, in the present application, the terminal device #B may transmit the downlink subframe format #A (specifically, the downlink subframe format #A-3), for example, on the carrier A, transmit data to the terminal device #A. The channel (i.e., an example of the first data channel, hereinafter, for ease of understanding and distinction, is referred to as: data channel #α-3).

For example, the terminal device #B can transmit the data channel #α-3 using the carrier #A based on the downlink subframe format #A-3, For example, the terminal device #B may map the data channel #α-3 on the symbol corresponding to the data channel indicated by the downlink subframe format #A-3 on the carrier #A.

Correspondingly, the terminal device #A can detect whether there is signal transmission on the carrier #A based on the downlink subframe format #A-3, for example, by blind detection, so that the data transmitted by the terminal device #B through the carrier #A can be acquired. channel.

In the present application, there may be a case where a plurality of terminal devices including the terminal device #B collectively use the carrier #A to transmit a data channel. In this case, the terminal device #A needs to be carried from the carrier #A. The data channel that needs to be acquired is identified in the channel (ie, the data channel sent by the terminal device #B)

For example, in the present application, the data channel #α-3 may have a mapping relationship with the terminal device #B or the terminal device #A, that is, the terminal device #A can perform predetermined processing on the data channel #α-3. To determine whether to acquire the data carried in the data channel #α-3.

By way of example and not limitation, in the present application, the terminal device #A can perform the specified processing on the data channel #α-3, which may include: the terminal device #A determines whether the data channel #α-3 carries the specified user identifier. .

Also, by way of example and not limitation, in the present application, the above-mentioned "prescribed user identification" may include the following identification.

1. Device identification of terminal device #A

By way of example and not limitation, in the present application, for example, the terminal device #A may authenticate the terminal device B, whereby the terminal device #A may determine that it is necessary to be based on the control channel transmitted by the terminal device #B. The control channel performs further communication (eg, data channel transmission, etc.).

Moreover, the terminal device #B can know the device identification of the terminal device #A in advance (for example, for ease of understanding and distinction, it is noted as: device identification #1), for example, the terminal device #A can The device identification (ie, device identification #1) of the terminal device #A is transmitted to the terminal device #B in advance. Here, a device identification can uniquely indicate a terminal device.

The terminal device #B can carry the device identification of the terminal device #A (ie, device identification #1) on the data channel #α-3.

Thereby, the terminal device #A detects whether or not the data channel #α-3 exists based on the device identification #1. If the terminal device #A detects the data channel #α-3, the terminal device #A can determine that it is necessary to acquire the data carried in the data channel #α-3 based on the device identification #1.

Alternatively, after the terminal device #A receives the data channel #α-3, the device identifier carried in the data channel #α-3 may be determined, that is, the terminal device #A may determine that the data channel #α-3 carries the device identifier. #1 Further, the terminal device #A may determine that it is necessary to acquire data carried in the data channel #α-3 based on the device identification #1.

2. Device identification assigned by terminal device #A to terminal device #B

By way of example and not limitation, in the present application, for example, the terminal device #A may authenticate the terminal device B, whereby the terminal device #A may determine that the data channel needs to be acquired after receiving the data channel transmitted by the terminal device #B Data carried in the data channel.

Further, the terminal device #A may allocate the device identification for indicating the terminal device #B to the terminal device B, for example, in the above-described authentication process (hereinafter, for convenience of understanding and distinction, it is noted as: device identification #2).

The terminal device #B can carry the device identification #2 on the data channel #α-3.

Thereby, the terminal device #A detects whether or not the data channel #α-3 exists based on the device identification #2. If the terminal device #A detects the data channel #α-3, the terminal device #A can determine that it is necessary to acquire the data carried in the data channel #α-3 based on the device identification #2.

Alternatively, after the terminal device #A receives the data channel #α-3, the device identifier carried by the data channel #α-3 may be determined, that is, the terminal device #A may determine that the data channel #α-3 carries the device identifier #2 Further, the terminal device #A can determine that it is necessary to acquire data carried in the data channel #α-3 based on the device identification #2.

It should be noted that the authentication process mentioned in the foregoing case 1, the case 2, and the case 2 may be implemented by one authentication process, or may be implemented by different authentication processes, which is not specifically limited.

That is, in the present application, when a plurality of terminal devices including the second terminal device jointly use the unlicensed carrier to transmit a data channel, the first terminal device cannot determine which terminal the received data channel is transmitted. In this case, the second terminal device may carry prescribed identification information (for example, the above device identification #1 or device identification #2) in the transmitted data channel.

Optionally, the first terminal device sends the response information to the second terminal device. That is, the communication between the first terminal device and the second terminal device may follow HARQ technology or ARQ technology. Taking the HARQ technology as the communication between the first terminal device and the second terminal device as an example, if the first terminal device correctly demodulates and decodes the data of the received second terminal device, the positive response is fed back to the second terminal device. (Acknowledgement, ACK); if the first terminal device does not correctly demodulate and decode the data of the received second terminal device, then feed a negative acknowledgement (NACK) to the second terminal device, and the second terminal device The data packet is retransmitted after receiving a negative response.

Further, in the present application, the transmission of the data channel #α-3 may be performed on the basis of the transmission of the control channel #α-2 and the reference signal #α-1. That is, optionally, the first terminal device can blindly detect the first reference signal. Further optionally, after detecting the first reference signal, the first terminal device may detect the first control channel according to the scrambling code identifier notified to the second terminal device. After the first terminal device correctly receives the first control channel, the first data channel may be received according to the indication information in the first control channel. And, when the transmission of the data channel #α-3 is performed on the basis of the transmission of the control channel #α-2, since the time-frequency resource corresponding to the data channel #α-3 can be indicated by the control channel #α-2 Therefore, it is not necessary to carry an identifier (for example, the above-described device identification #1 or device identification #2) for indicating the terminal device #B in the data channel #α-3.

Optionally, the transmission of the data channel #α-3 is performed on the basis of the transmission of the control channel #α-2 and the reference signal #α-1, when the plurality of second terminal devices use the same first virtual cell identifier And/or the same specified scrambling code identification, the plurality of second terminal devices can perform demodulation of the control channel #α-2 using a common reference signal. In this case, the transmission of the first data channel of each second terminal device is preferably a transmission mode demodulated using the terminal device-specific reference signal, for example using one of TM7, TM8, TM9, TM10. Alternatively, the transmission of the data channel #α-3 may also be independent of the transmission of the control channel #α-2 and the reference signal #α-1.

Optionally, in the present application, after receiving the data channel #α-3 sent by the terminal device #B through the carrier #A, the terminal device #A can acquire the data packet carried in the data channel #α-3 (below In order to facilitate understanding and speaking, it is recorded as: data packet #B), wherein the data packet #B may be the data that the terminal device #B needs to send to the terminal device #A (hereinafter, in order to facilitate understanding and distinction, note , data #1).

As an example and not by way of limitation, for example, the data #1 may also be data that needs to be transmitted to the network device by the terminal device #A (ie, an example of the first data), in which case the terminal device #A may also pass the carrier# B sends the data #1 to the network device.

The carrier #B may be a carrier on a licensed frequency band or a carrier on an unlicensed frequency band, and is not specifically limited in this application.

Furthermore, the carrier #B and the carrier #A may be the same carrier or different carriers, and the present application is not particularly limited.

By way of example and not limitation, in the present application, the terminal device #B transmits the data #1 to the network device in the following manner.

method 1

Optionally, the terminal device #A may not further parse (or decapsulate) the data packet #B, but further encapsulates it on the basis of the data packet #B to generate an interface between the terminal device #A and the network device. The packet #A1 of the communication rule is sent to the network device, so that the network device can perform decapsulation processing on the packet #A1 to obtain the packet #B, and perform the packet #B Decapsulation processing to obtain data #1.

Method 2

Alternatively, the terminal device #A may parse (or decapsulate) the data packet #B, thereby obtaining the data #1, and encapsulating the data #1 to generate an interface between the terminal device #A and the network device. The packet #A2 of the communication rule is transmitted to the network device, so that the network device can perform decapsulation processing on the packet #A2 to obtain the data #1.

In addition, as an example and not by way of limitation, in the present application, the terminal device #A may encapsulate data from a plurality of terminal devices (including the terminal device #B) in one data packet and transmit the data to the network device. Moreover, optionally, the data of each terminal device may carry the identification information of the terminal device, so that the network device can distinguish the terminal device from which the data is derived based on the identification information in each data.

Also, by way of example and not limitation, in addition to the terminal device #A described above, the terminal device #B may also transmit the data packet #B to other terminal devices, and the other terminal device may transmit the data in the data packet #B to the network. device. In this case, the network device can correctly receive the data in the data packet #B forwarded by one terminal device, and the communication process between the terminal device #B or the network device and the other terminal device can be associated with the terminal. The communication process between the device #B or the network device and the terminal device #A is similar, and a detailed description thereof will be omitted herein to avoid redundancy.

Optionally, after successfully receiving and parsing the data #1, the network device may use a message for indicating that the data is successfully received (hereinafter, for ease of understanding and description, it is recorded as: a success message), for example, by carrier #A Or carrier #B, sent to terminal device #B.

Moreover, the manner in which the network device sends the success message to the terminal device #B is a manner in which the network device sends the downlink data to the terminal device #B. Since the uplink transmission coverage of the terminal device #B is limited, the network device further optionally transmits the network device in a conservative manner (selecting a lower modulation coding scheme, lower target BLER, bundling transmission, multiple retransmissions, etc.) The success message, that is, the network device can assume the correctness of the successful message transmission, that is, the terminal device #B does not need to respond to the success message.

By way of example and not limitation, the terminal device #A may be a device with a higher transmission power, such as a smart phone, in the prior art, and the terminal device #B may be a device with a lower transmission power, such as a wearable device. Therefore, even in the case where the network device is outside the coverage of the terminal device #B, the method of wireless communication of the present application can still obtain the terminal device #B reliably by the forwarding of the terminal device #A. Upstream data.

According to the method of wireless communication of the present application, the transmitting terminal device can transmit a signal for carrying information required to be transmitted to the receiving terminal device by using the downlink subframe format used by the transmitting terminal device, and the receiving terminal device can perform according to the The downlink subframe format used in the downlink transmission receives the information from the terminal device of the transmitting end, thereby completing the communication between the devices, thereby reducing the requirement for transmitting the request information with a specific format compared to the prior art. Up The processing load of the terminal device improves the performance of the wireless communication.

In the existing inter-device communication technology, when two terminal devices need to transmit data, one terminal device needs to send request information for requesting establishment of a communication connection between devices to another terminal device, since the time for transmitting the request information is dynamically changed. Therefore, the receiving terminal device needs to detect the request information frequently, and thus the receiving device has a large processing load.

In this regard, the present application provides a wireless communication method 300 that can effectively reduce the processing load of the receiving device. FIG. 3 shows a schematic interaction diagram of the communication method 300.

As shown in FIG. 3, in the present application, a cell to which the terminal device #C (that is, an example of the first terminal device) and the terminal device #D (that is, an example of the second terminal device) belong to (hereinafter, for ease of understanding) And distinguishing, in the cell #X), the network device providing the cell #X can be based on the solution provided by the prior art and one or more terminal devices in the cell (may include the terminal device #C or the terminal device# D) Perform wireless communication.

It should be noted that the time-frequency resource used in the wireless communication may be a time-frequency resource on a licensed frequency band or a time-frequency resource on an unlicensed frequency band, and is not specifically limited in this application.

Additionally, the wireless communication can include uplink transmissions and downlink transmissions.

Therefore, at S310, the terminal device #C and the terminal device #D can listen to the frequency band used by the cell #X to determine a certain frequency band used by the cell #X (hereinafter, for ease of understanding and differentiation, note : the end time of the ongoing downlink transmission (or the downlink transmission at the current time) on the frequency band #C), or the end time of the upcoming downlink transmission (or the first downlink transmission after the current time) . Further, the terminal device #C and the terminal device #D may determine a time range having a preset time period from the end time of the downlink transmission (ie, an example of the first time range, hereinafter, for ease of understanding and distinction, note: Time range #1).

In the LTE system, the concept of Transmission Opportunity (TxOP) is introduced in the frame structure on the unlicensed band. The transmission opportunity may also be referred to as a transmission burst (Transmission Burst), and a TxOP may include a downlink burst. Transmission (DL Transmission Burst, Downlink Transmission Burst).

Optionally, in the present application, one TxOP may further include an uplink transmission burst (UL Transmission Burst).

As an example and not by way of limitation, as shown in FIG. 4, the "first time range" may refer to: downlink burst transmission from ongoing or upcoming (for ease of understanding and differentiation, recorded as: downlink burst transmission #1) The time range between the end time of the signal transmission of the last downlink subframe (which may be a complete subframe or a partial subframe) to the start time of the uplink burst transmission. Here, the specific manner of the downlink burst transmission and the uplink burst transmission, and the subframe structure and the like may be adopted in the prior art. Here, in order to avoid redundancy, detailed description thereof will be omitted.

By way of example and not limitation, the “first time range” only occurs when the last downlink subframe of the downlink burst transmission is a partial subframe, and specifically may refer to: downlink burst transmission from ongoing or upcoming (for For easy understanding and differentiation, it is recorded as: the time range between the end time of the signal transmission of the last downlink subframe in the downlink burst transmission #2) and the end time of the subframe of the last downlink subframe of the downlink burst transmission #2 . Here, the specific manner of the downlink burst transmission, the subframe structure, and the like may be adopted in the prior art, and a detailed description thereof will be omitted herein to avoid redundancy.

Thereafter, the terminal device #C and the terminal device #D may determine the period #1 (ie, an example of the first period) from the time range #1 on the band #C, where the period #1 may be the time range #1 All or part of the time period, the application is not particularly limited, and when the time period #1 may be a part of the time range #1, the time period #1 is at the time The position in the range #1 can be arbitrarily changed, and the present application is not particularly limited.

As an example and not by way of limitation, for example, the period #1 may be the first K symbols in the time range #1, K≥1. Or, for example, the period #1 may be the first K symbols experienced since the network device completes one data transmission (ie, one downlink transmission ends).

And, the terminal device #D may generate the request information #M (ie, an example of the transmission request information) for instructing the terminal device #D to request to transmit data to the terminal device #C (ie, the second An example of the data, hereinafter, is referred to as data #2) for ease of understanding and differentiation. In the present application, the format, content, and generation manner of the request information #M may be similar to the prior art, and a detailed description thereof will be omitted herein to avoid redundancy.

At S320, the terminal device #D may transmit the request information #M to the terminal device #C through the band #C in the period #1.

The terminal device #C can detect whether or not the request information is carried on the band #C in the period #1 (or, time range #1), and further, the request information #M can be detected.

At S330, the terminal device #C and the terminal device #D may perform data transmission based on the request information #M, and the process of the data transmission may be similar to the prior art, and a detailed description thereof is omitted herein to avoid redundancy.

That is, in the present application, the data packet transmitted by the terminal device #D to the terminal device #C is recorded as: data packet #D, and the data packet #D may be the terminal device #D pair that needs to be transmitted to the terminal device #C. Data (ie, data #2).

By way of example and not limitation, for example, the data #2 may also be data that needs to be transmitted to the network device by the terminal device #C, in which case the terminal device #C may also send the data #2 to the network via the carrier #D. device.

The carrier #D may be a carrier on a licensed frequency band or a carrier on an unlicensed frequency band, and is not specifically limited in this application.

Furthermore, the carrier #D and the carrier #C may be the same carrier or different carriers, and the present application is not particularly limited.

By way of example and not limitation, in the present application, the terminal device #C transmits the data #2 to the network device in the following manner.

Method 3

Optionally, the terminal device #C may not parse (or decapsulate) the data packet #D, but further encapsulates it directly on the basis of the data packet #D to generate an interface between the terminal device #C and the network device. The packet #C1 of the communication rule is sent to the network device, so that the network device can decapsulate the packet #C1 to obtain the packet #D and perform the packet #D Decapsulation processing to obtain data #2.

Method 4

Optionally, the terminal device #C may parse (or decapsulate) the data packet #D, thereby obtaining the data #2, and encapsulating the data #2 to generate an interface between the terminal device #C and the network device. The packet #C2 of the communication rule is transmitted to the network device, so that the network device can perform decapsulation processing on the packet #C2 to obtain data #2.

In addition, as an example and not by way of limitation, in the present application, the terminal device #C may encapsulate data from a plurality of terminal devices (including the terminal device #D) in one data packet and transmit the data to the network device. Moreover, optionally, the data of each terminal device may carry the identification information of the terminal device, so that the network device can distinguish the terminal device from which the data is derived based on the identification information in each data.

Moreover, as an example and not by way of limitation, the terminal device #D may also be directed to other terminals in addition to the above-described terminal device #C The device sends the data packet #D, and the other terminal device can send the data in the data packet #D to the network device. In this case, the network device can correctly receive the data in the data packet #D forwarded by one terminal device, and the communication process between the terminal device #D or the network device and the other terminal device can be associated with the terminal. The communication process between the device #D or the network device and the terminal device #C is similar, and a detailed description thereof will be omitted herein to avoid redundancy.

Optionally, after successfully receiving and parsing the data #2, the network device may use a message for indicating that the data is successfully received (hereinafter, for ease of understanding and description, it is recorded as: a success message), for example, by carrier #C Or carrier #D, sent to terminal device #D.

Moreover, the manner in which the network device sends the success message to the terminal device #D is a manner in which the network device sends the downlink data to the terminal device #D. Since the uplink transmission coverage of the terminal device #D is limited, further optionally, the network device transmits the transmission in a conservative manner (selecting a lower modulation coding scheme, lower target BLER, bundling transmission, multiple retransmissions, etc.) The success message, ie the network device can assume the correctness of the successful message transmission, ie the terminal device #D does not need to respond to the success message.

By way of example and not limitation, the terminal device #C may be a device with a higher transmission power, such as a smart phone, in the prior art, and the terminal device #D may be a device with a lower transmission power, such as a wearable device. Therefore, even in the case where the network device is outside the uplink coverage of the terminal device #D, the network device can reliably obtain the terminal device #D through the forwarding of the terminal device #C by the method of wireless communication of the present application. Upstream data. Further, since the terminal device #C does not need to detect whether or not the transmission request information transmitted by the terminal device #D is received for a long time, the burden on the terminal device #C can be reduced.

By causing the transmitting terminal device and the receiving terminal device to transmit the request information within a predetermined duration after the end of the downlink transmission, and performing inter-device communication with the receiving terminal device based on the request information, the receiving terminal device can detect the time without detecting the terminal device. The information is requested, so that the processing load of the receiving terminal device can be reduced.

5 shows a schematic block diagram of an apparatus 400 for wireless communication of the present application, which may correspond to (eg, may be configured or itself) the first terminal device described in the above method 200 (eg, The terminal device #A), and each module or unit in the device 400 for wireless communication is used to perform each action or process performed by the first terminal device (for example, the terminal device #A) in the above method 200, where In order to avoid redundancy, a detailed description thereof will be omitted.

In the present application, the apparatus 400 can include a processor and a transceiver coupled to the transceiver. Optionally, the apparatus further includes a memory, the memory being coupled to the processor, and further optionally, the apparatus includes a bus system . Wherein, the processor, the memory and the transceiver can be connected by a bus system, the memory can be used to store instructions for executing instructions stored in the memory to control the transceiver to transmit information or signals.

Wherein, the determining unit in the device 400 shown in FIG. 5 can correspond to the processor, and the communication unit in the device 400 shown in FIG. 5 can correspond to the transceiver.

6 shows a schematic block diagram of an apparatus 500 for wireless communication of the present application, which may correspond to (eg, may be configured or itself) a second terminal device described in the above method 200 (eg, The terminal device #B), and each module or unit in the wireless communication device 500 is used to perform each action or process performed by the second terminal device (for example, the terminal device #B) in the above method 200, where In order to avoid redundancy, a detailed description thereof will be omitted.

In the present application, the apparatus 500 can include a processor and a transceiver, the processor being coupled to the transceiver, and optionally the apparatus further comprising a memory coupled to the processor, and optionally optionally the device comprising a bus system . among them, The processor, memory and transceiver can be coupled by a bus system that can be used to store instructions for executing instructions stored by the memory to control the transceiver to transmit information or signals.

Wherein, the determining unit in the apparatus 500 shown in FIG. 6 can correspond to the processor, and the communication unit in the apparatus 500 shown in FIG. 6 can correspond to the transceiver.

7 shows a schematic block diagram of an apparatus 600 for wireless communication of the present application, which may correspond to (eg, may be configured or itself) a first terminal device described in the method 300 above (eg, The terminal device #C), and each module or unit in the device 600 for wireless communication is used to perform each action or process performed by the first terminal device (for example, the terminal device #C) in the above method 300, where In order to avoid redundancy, a detailed description thereof will be omitted.

In the present application, the apparatus 600 can include a processor and a transceiver, the processor and the transceiver being coupled, optionally, the device further comprising a memory, the memory being coupled to the processor, and further optionally the device comprising a bus system . Wherein, the processor, the memory and the transceiver can be connected by a bus system, the memory can be used to store instructions for executing instructions stored in the memory to control the transceiver to transmit information or signals.

Wherein, the determining unit in the device 600 shown in FIG. 7 can correspond to the processor, and the communication unit in the device 600 shown in FIG. 7 can correspond to the transceiver.

8 shows a schematic block diagram of an apparatus 700 for wireless communication of the present application, which may correspond to (eg, may be configured or itself) a second terminal device described in the method 300 above (eg, The terminal device #D), and each module or unit in the device 700 for wireless communication is used to perform each action or process performed by the second terminal device (for example, the terminal device #D) in the above method 300, where In order to avoid redundancy, a detailed description thereof will be omitted.

In the present application, the apparatus 700 can include a processor and a transceiver, the processor being coupled to the transceiver, optionally, the apparatus further comprising a memory, the memory being coupled to the processor, and further optionally the apparatus comprising a bus system . Wherein, the processor, the memory and the transceiver can be connected by a bus system, the memory can be used to store instructions for executing instructions stored in the memory to control the transceiver to transmit information or signals.

Wherein, the determining unit in the apparatus 700 shown in FIG. 8 can correspond to the processor, and the transmitting unit in the apparatus 700 shown in FIG. 8 can correspond to the transceiver.

It should be noted that the above method embodiments of the present application may be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method embodiment may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software. The processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like. Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in this application can be implemented or executed. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in connection with the present application may be directly embodied by the execution of the hardware decoding processor or by a combination of hardware and software modules in the decoding processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method.

It will be understood that the memory in this application may be a volatile memory or a non-volatile memory, or may include volatile Both sex and non-volatile memory. The non-volatile memory may be a read-only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (Erasable PROM, EPROM), or an electric Erase programmable read only memory (EEPROM) or flash memory. The volatile memory can be a Random Access Memory (RAM) that acts as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM). SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Synchronous Connection Dynamic Random Access Memory (Synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (DR RAM). It should be noted that the memories of the systems and methods described herein are intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the term "and/or" herein is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

It should be understood that, in various embodiments of the present application, the size of the serial numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be implemented in the present application. The process constitutes any limitation.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including Several instructions to make a computer device (can be a personal meter) A computer, server, or network device, etc.) performs all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims (40)

A method of wireless communication, the method comprising: Determining, by the first terminal device, a downlink subframe format, where the downlink subframe format is a subframe format used when performing downlink transmission between the first terminal device and the network device; The first terminal device receives the first signal sent by the second terminal device according to the downlink subframe format, and the subframe format corresponding to the first signal is the downlink subframe format. The method according to claim 1, wherein the downlink subframe format comprises a first downlink subframe format, and the first downlink subframe format is sent by the network device to the first terminal device a subframe format of the downlink reference signal, the first signal including the first reference signal, and Receiving, by the first terminal device, the first signal sent by the second terminal device according to the downlink subframe format, including: The first terminal device receives the first reference signal according to the first downlink subframe format. The method according to claim 2, wherein the first reference signal is a reference signal generated according to any one of a first cell identifier, a second cell identifier, or a third cell identifier, where The first cell identifier is a virtual cell identifier of the first terminal device, and the second cell identifier is a virtual cell identifier allocated by the first terminal device to the second terminal device, where the third cell identifier is a cell identifier of a cell in which the first terminal device and the second terminal device are co-located. The method according to any one of claims 1 to 3, wherein the downlink subframe format includes a second downlink subframe format, and the second downlink subframe format is sent by the network device to the a subframe format of a downlink control channel of the first terminal device, where the first signal includes a first control channel, and Receiving, by the first terminal device, the first signal sent by the second terminal device according to the downlink subframe format, including: The first terminal device receives the first control channel according to the second downlink subframe format. The method according to claim 4, wherein the second downlink subframe format comprises a physical downlink control channel PDCCH, an enhanced physical downlink control channel EPDCCH, a machine type communication physical downlink control channel MPDCCH or a short transmission time interval physical downlink The subframe format of any one of the control channels SPDCCH. The method according to claim 4 or 5, wherein the scrambling code identifier RNTI carried by the first control channel is a first scrambling code identifier or a second scrambling code identifier, wherein the first scrambling code identifier is The scrambling code identifier of the first terminal device, where the second scrambling code identifier is a scrambling code identifier allocated by the first terminal device to the second terminal device. The method according to any one of claims 1 to 6, wherein the downlink subframe format includes a third downlink subframe format, and the third downlink subframe format is sent by the network device to the a subframe format of a downlink data channel of the first terminal device, the first signal including a first data channel, and Receiving, by the first terminal device, the first signal sent by the second terminal device according to the downlink subframe format, including: The first terminal device receives the first data channel according to the third downlink subframe format. The method of claim 7, wherein the method further comprises: The first terminal device sends the first data carried in the first data channel to the network device. A method of wireless communication, the method comprising: The second terminal device determines a downlink subframe format, where the downlink subframe format is between the first terminal device and the network device The subframe format used for downlink transmission; The second terminal device sends a first signal to the first terminal device according to the downlink subframe format, and the subframe format corresponding to the first signal is the downlink subframe format. The method according to claim 9, wherein the downlink subframe format comprises a first downlink subframe format, and the first downlink subframe format is sent by the network device to the first terminal device Subframe format of the downlink reference signal, and Sending, by the second terminal device, the first signal to the first terminal device according to the downlink subframe format, including: Transmitting, by the second terminal device, the first reference signal to the first terminal according to the first downlink subframe format, where the subframe format corresponding to the first reference signal is the first downlink subframe format . The method of claim 10, wherein the method further comprises: Generating, by the second terminal device, the first reference signal according to the first downlink subframe format and any one of a first cell identifier, a second cell identifier, or a third cell identifier, where the The first cell identifier is a virtual cell identifier of the first terminal device, and the second cell identifier is a virtual cell identifier allocated by the first terminal device to the second terminal device, where the third cell identifier is a cell identifier of a cell in which the first terminal device and the second terminal device are co-located. The method according to any one of claims 9 to 11, wherein the downlink subframe format comprises a second downlink subframe format, and the second downlink subframe format is sent by the network device to the a subframe format of a downlink control channel of the first terminal device, and Sending, by the second terminal device, the first signal to the first terminal device according to the downlink subframe format, including: The second terminal device sends a first control channel to the first terminal according to the second downlink subframe format, where the subframe format corresponding to the first control channel is the second downlink subframe format. The method according to claim 12, wherein the second downlink subframe format comprises a physical downlink control channel PDCCH, an enhanced physical downlink control channel EPDCCH, a machine type communication physical downlink control channel MPDCCH or a short transmission time interval physical downlink The subframe format of any one of the control channels SPDCCH. The method according to claim 12 or 13, wherein the scrambling code identifier RNTI carried by the first control channel is a first scrambling code identifier or a second scrambling code identifier, wherein the first scrambling code identifier is The scrambling code identifier of the first terminal device, where the second scrambling code identifier is a scrambling code identifier allocated by the first terminal device to the second terminal device. The method according to any one of claims 9 to 14, wherein the downlink subframe format comprises a third downlink subframe format, and the third downlink subframe format is sent by the network device to the a subframe format of a downlink data channel of the first terminal device, and Sending, by the second terminal device, the first signal to the first terminal device according to the downlink subframe format, including: The second terminal device sends a first data channel to the first terminal device according to the third downlink subframe format, where the subframe format corresponding to the first data channel is the third downlink subframe format. A method of wireless communication, the method comprising: Determining, by the first terminal device, the first time period, where the first time period belongs to the first time range, the start time of the first time range is the end time of the first downlink transmission, and the duration of the first time range is a value, the first downlink transmission belongs to downlink transmission performed in a cell to which the first terminal device and the second terminal device belong, and The first downlink transmission is a downlink transmission that is ongoing at the current moment in the downlink transmission, or the first downlink transmission is a first downlink transmission after the current moment in the downlink transmission; Receiving, by the first terminal device, the transmission request information sent by the second terminal device, where the transmission request information is used to indicate that the second terminal device requests to send data to the first terminal device. ; The first terminal device receives the second data sent by the second terminal device according to the transmission request information. The method according to claim 16, wherein the end time of the first downlink transmission is a signal in a last downlink subframe of the downlink burst transmission DL Transmission Burst to which the first downlink transmission belongs The end time of the transmission, and a time interval between the end time of the first downlink transmission and the end time of the subframe of the last downlink subframe. The method according to claim 16 or 17, wherein the method further comprises: The first terminal device sends the second data to a network device. A method of wireless communication, the method comprising: Determining, by the second terminal device, the first time period, where the first time period belongs to the first time range, the start time of the first time range is the end time of the first downlink transmission, and the duration of the first time range is Setting a value, the first downlink transmission belongs to downlink transmission performed in a cell to which the first terminal device and the second terminal device belong, and the first downlink transmission is at a current moment in the downlink transmission The downlink transmission is in progress, or the first downlink transmission is the first downlink transmission after the current moment in the downlink transmission; The second terminal device sends, to the first terminal device, transmission request information, where the transmission request information is used to indicate that the second terminal device requests to send data to the first terminal device; The second terminal device sends the second data to the first terminal device. The method according to claim 19, wherein the end time of the first downlink transmission is a signal in a last downlink subframe of the downlink burst transmission DL Transmission Burst to which the first downlink transmission belongs The end time of the transmission, and a time interval between the end time of the first downlink transmission and the end time of the subframe of the last downlink subframe. A device for wireless communication, characterized in that the device comprises: a determining unit, configured to determine a downlink subframe format, where the downlink subframe format is a subframe format used when performing downlink transmission between the device and the network device; And a communication unit, configured to receive, according to the downlink subframe format, a first signal sent by the second terminal device, where a subframe format corresponding to the first signal is the downlink subframe format. The device according to claim 21, wherein the downlink subframe format comprises a first downlink subframe format, and the first downlink subframe format is a downlink reference sent by the network device to the device. a subframe format of the signal, the first signal comprising a first reference signal; The communication unit is specifically configured to receive the first reference signal according to the first downlink subframe format. The apparatus according to claim 22, wherein the first reference signal is a reference signal generated according to any one of a first cell identifier, a second cell identifier, or a third cell identifier, wherein the The first cell identifier is a virtual cell identifier of the device, the second cell identifier is a virtual cell identifier allocated by the device to the second terminal device, and the third cell identifier is the device and the first The cell identity of the cell in which the two terminal devices are co-located. The apparatus according to any one of claims 21 to 23, wherein the downlink subframe format packet a second downlink subframe format, where the second downlink subframe format is a subframe format of a downlink control channel that is sent by the network device to the device, where the first signal includes a first control channel; The communication unit is specifically configured to receive the first control channel according to the second downlink subframe format. The device according to claim 24, wherein the second downlink subframe format comprises a physical downlink control channel PDCCH, an enhanced physical downlink control channel EPDCCH, a machine type communication physical downlink control channel MPDCCH or a short transmission time interval physical downlink The subframe format of any one of the control channels SPDCCH. The device according to claim 24 or 25, wherein the scrambling code identifier RNTI carried by the first control channel is a first scrambling code identifier or a second scrambling code identifier, wherein the first scrambling code identifier is The scrambling code identifier of the device, where the second scrambling code identifier is a scrambling code identifier allocated by the device to the second terminal device. The apparatus according to any one of claims 21 to 26, wherein the downlink subframe format includes a third downlink subframe format, and the third downlink subframe format is sent by the network device to the a subframe format of a downlink data channel of the apparatus, the first signal including a first data channel; The communication unit is specifically configured to receive the first data channel according to the third downlink subframe format. The apparatus according to claim 27, wherein the communication unit is further configured to send the first data carried in the first data channel to the network device. A device for wireless communication, characterized in that the device comprises: a determining unit, configured to determine a downlink subframe format, where the downlink subframe format is a subframe format used when performing downlink transmission between the first terminal device and the network device; And a communication unit, configured to send, according to the downlink subframe format, a first signal to the first terminal device, where a subframe format corresponding to the first signal is the downlink subframe format. . The device according to claim 29, wherein the downlink subframe format comprises a first downlink subframe format, and the first downlink subframe format is sent by the network device to the first terminal device Subframe format of the downlink reference signal, and The communication unit is configured to send, according to the first downlink subframe format, a first reference signal to the first terminal, where a subframe format corresponding to the first reference signal is the first downlink subframe format. The apparatus according to claim 30, wherein the determining unit is further configured to: according to the first downlink subframe format and any one of a first cell identifier, a second cell identifier, or a third cell identifier Identifying, the first reference signal is generated, where the first cell identifier is a virtual cell identifier of the first terminal device, and the second cell identifier is a virtual space allocated by the first terminal device to the device a cell identifier, where the third cell identifier is a cell identifier of a cell in which the first terminal device and the device are located together. The apparatus according to any one of claims 29 to 31, wherein the downlink subframe format comprises a second downlink subframe format, and the second downlink subframe format is sent by the network device to the a subframe format of a downlink control channel of the first terminal device, and The communication unit is specifically configured to send, by using the second downlink subframe format, a first control channel to the first terminal, where a subframe format corresponding to the first control channel is the second downlink subframe format. The apparatus according to claim 32, wherein the second downlink subframe format comprises a physical downlink control channel PDCCH, an enhanced physical downlink control channel EPDCCH, a machine type communication physical downlink control channel MPDCCH or a short transmission time interval physical downlink Subframe of any one of the control channels SPDCCH formula. The device according to claim 32 or 33, wherein the scrambling code identifier RNTI carried by the first control channel is a first scrambling code identifier or a second scrambling code identifier, wherein the first scrambling code identifier is The scrambling code identifier of the first terminal device, where the second scrambling code identifier is a scrambling code identifier allocated by the first terminal device to the device. The apparatus according to any one of claims 29 to 34, wherein the downlink subframe format comprises a third downlink subframe format, and the third downlink subframe format is sent by the network device to the a subframe format of a downlink data channel of the first terminal device, and The communication unit is specifically configured to send a first data channel to the first terminal device according to a third downlink subframe format, where a subframe format corresponding to the first data channel is the third downlink subframe format. A device for wireless communication, characterized in that the device comprises: a determining unit, configured to determine a first time period, where the first time period belongs to a first time range, a start time of the first time range is an end time of the first downlink transmission, and a duration of the first time range is a preset value, where the first downlink transmission belongs to downlink transmission performed in a cell to which the device and the second terminal device belong, and the first downlink transmission is that the downlink transmission is ongoing at a current moment Downlink transmission, or the first downlink transmission is the first downlink transmission after the current moment in the downlink transmission; a communication unit, configured to receive, in the first time period, transmission request information sent by the second terminal device, where the transmission request information is used to indicate that the second terminal device requests to send data to the device; The communication unit is further configured to receive the second data sent by the second terminal device according to the transmission request information. The apparatus according to claim 36, wherein the end time of the first downlink transmission is a signal in a last downlink subframe of the downlink burst transmission DL Transmission Burst to which the first downlink transmission belongs The end time of the transmission, and a time interval between the end time of the first downlink transmission and the end time of the subframe of the last downlink subframe. The apparatus according to claim 36 or 37, wherein said communication unit is further configured to transmit said second data to a network device. A device for wireless communication, characterized in that the device comprises: a determining unit, configured to determine a first time period, where the first time period belongs to a first time range, a start time of the first time range is an end time of the first downlink transmission, and a duration of the first time range is a preset value, where the first downlink transmission belongs to downlink transmission performed in a cell to which the first terminal device and the device belong, and the first downlink transmission is in the downlink transmission being performed at a current moment Downlink transmission, or the first downlink transmission is the first downlink transmission after the current moment in the downlink transmission; a sending unit, configured to send, to the first terminal device, transmission request information, where the transmission request information is used to indicate that the apparatus requests to send data to the first terminal device; The sending unit is further configured to send the second data to the first terminal device. The apparatus according to claim 39, wherein the end time of the first downlink transmission is a signal in a last downlink subframe of the downlink burst transmission DL Transmission Burst to which the first downlink transmission belongs The end time of the transmission, and a time interval between the end time of the first downlink transmission and the end time of the subframe of the last downlink subframe.

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