CN114846898A

CN114846898A - Method and device for transmitting uplink data

Info

Publication number: CN114846898A
Application number: CN202080089210.6A
Authority: CN
Inventors: 骆喆; 张云昊; 陈雁; 徐修强
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2022-08-02
Also published as: WO2021142652A1

Abstract

The embodiment of the application provides a method and a device for transmitting uplink data. When the network device does not correctly receive the first uplink data sent by the terminal device on the configuration authorization resource, the network device flexibly indicates the terminal device retransmission mode through the first indication information. By the method, the reliability of retransmission data is improved, and the frequency spectrum efficiency is improved.

Description

Method and device for transmitting uplink data

Technical Field

The embodiment of the application relates to the field of wireless communication, in particular to a method and a device for uplink data transmission.

Background

With the development of communication technology and the improvement of user requirements, terminal devices in a communication scene gradually exhibit characteristics of large quantity, multiple forms and the like. For example, in an industrial automation scenario, there are a large number of monitoring devices, machines, or sensors, etc. in a plant; in the family and life scenes, a large number of mobile phones, flat panels, wearable devices, smart home appliances, vehicle-mounted terminal devices, or the like exist.

Disclosure of Invention

The embodiment of the application provides an uplink data transmission method, which is used for improving the reliability and the spectral efficiency of data transmission.

In a first aspect, a method for uplink data transmission is provided, where an execution subject of the method is a terminal device or a module in the terminal device. The description is made taking a terminal device as an execution subject. The terminal equipment sends first uplink data to the network equipment; the terminal equipment receives first indication information from the network equipment, wherein the first indication information indicates feedback information of first uplink data; and when the first indication information meets a first condition, the terminal equipment sends a random access preamble sequence and second uplink data to the network equipment, wherein the second uplink data is retransmission data of the first uplink data.

By implementing the method described in the first aspect, the terminal device determines whether the terminal device needs to retransmit and a retransmission manner through the first indication information. And when the first indication information meets the first condition, the terminal equipment retransmits in a mode of sending a random access preamble sequence and second uplink data to the network equipment. In this way, the network device can obtain the retransmission combination gain through the second uplink data sent by the terminal device, and can update the timing advance TA through the random access preamble sequence sent by the terminal device, and decode the first uplink data and the second uplink data by using the new TA, thereby improving the decoding success rate of the first uplink data and the second uplink data, and further improving the transmission reliability of the first uplink data.

In a possible implementation manner of the first aspect, the terminal device sends the first uplink data to the network device through a first uplink data channel, where a time-frequency resource of the first uplink data channel is indicated by a first radio resource control RRC message. In this possible implementation manner, the time-frequency resource of the first uplink data channel is an unlicensed resource configured for the terminal device by the network device through the first RRC message. And the terminal equipment sends a first uplink data channel to the network equipment on the authorization-free resource.

By implementing the method, the terminal equipment can directly use the authorization-free resource pre-configured by the network equipment to send the first uplink data channel to the network equipment without waiting for the dynamic authorization of the network equipment, thereby saving signaling overhead and reducing transmission delay.

In a possible implementation manner of the first aspect, the terminal device determines the time-frequency resource of the second uplink data channel according to the random access preamble sequence and a mapping relationship between the random access preamble sequence and the time-frequency resource of the uplink data channel, where the second uplink data channel carries the second uplink data. In this possible implementation manner, the mapping relationship between the random access preamble sequence and the time-frequency resource of the uplink data channel includes: the mapping relation between one or more of the three parameters including the physical random access channel opportunity RO where the random access leader sequence is located, the root sequence number of the random access leader sequence and the cyclic shift value of the random access leader sequence and the time frequency resource of the uplink data channel.

By implementing the method, the terminal equipment can determine the time-frequency resource of the second uplink data channel according to the random access preamble sequence and the mapping relation without indicating the time-frequency resource to the terminal equipment by the network equipment through the indication information, thereby saving signaling overhead.

In a possible implementation manner of the first aspect, when the first indication information satisfies the second condition, the terminal device sends the random access preamble sequence to the network device.

By implementing the method, when the network device considers that the first uplink data is not correctly received because the TA is not updated in time, the network device can instruct the terminal device to send the random access preamble sequence. At this time, the network device estimates a new TA according to the random access preamble sequence, and decodes the first uplink data by using the new TA, thereby improving the success rate of decoding the first uplink data and further improving the reliability of data transmission.

In a possible implementation manner of the first aspect, when the first indication information meets the third condition, the terminal device sends the second uplink data to the network device through a second uplink data channel, where the time-frequency resource of the second uplink data channel is indicated by the first indication information.

In a possible implementation manner of the first aspect, when the first indication information meets the fourth condition, the terminal device sends the second uplink data to the network device through a second uplink data channel, where a time-frequency resource of the second uplink data channel is indicated by the first RRC message.

By implementing the two methods, when the network device considers that the first uplink data cannot be correctly received and the timeliness of the TA is irrelevant, the network device instructs the terminal device to send the second uplink data on the time-frequency resource of the second uplink data channel. In this way, the terminal device may not transmit the random access preamble sequence, thereby improving spectral efficiency.

In a second aspect, the present application provides a method for uplink data transmission, where an execution subject of the method is a network device or a module in the network device. The description is made taking a network device as an execution subject. The network equipment receives first uplink data from the terminal equipment; the network equipment sends first indication information to the terminal equipment, wherein the first indication information indicates the feedback information of the first uplink data; when the first indication information meets a first condition, the network device receives a random access preamble sequence and second uplink data from the terminal device, where the second uplink data is retransmission data of the first uplink data.

In a possible implementation manner of the second aspect, the network device receives first uplink data from the terminal device through a first uplink data channel, where a time-frequency resource of the first uplink data channel is indicated by a first RRC message. In this possible implementation manner, the time-frequency resource of the first uplink data channel is an unlicensed resource configured for the terminal device by the network device through the first RRC message. And the terminal equipment sends a first uplink data channel to the network equipment on the authorization-free resource.

In a possible implementation manner of the second aspect, the network device determines, according to the random access preamble sequence and a mapping relationship between the random access preamble sequence and a time-frequency resource of an uplink data channel, a time-frequency resource of a second uplink data channel, where the second uplink data channel carries the second uplink data. For the description of the mapping relationship, reference may be made to the first aspect, which is not described herein again.

In a possible implementation manner of the second aspect, when the first indication information satisfies the second condition, the network device receives the random access preamble sequence from the terminal device.

In a possible implementation manner of the second aspect, when the first indication information satisfies the third condition, the network device receives second uplink data from the terminal device through a second uplink data channel, where a time-frequency resource of the second uplink data channel is indicated by the first indication information.

In a possible implementation manner of the second aspect, when the first indication information satisfies the fourth condition, the network device receives second uplink data from the terminal device through a second uplink data channel, where a time-frequency resource of the second uplink data channel is indicated by the first RRC message.

In a third aspect, a method for uplink data transmission is provided, where an execution subject of the method is a terminal device or a module in the terminal device. The description is made taking a terminal device as an execution subject. The terminal equipment sends first uplink data to the network equipment; the terminal equipment receives first indication information from the network equipment, wherein the first indication information indicates feedback information of first uplink data; and when the first indication information meets a second condition, the terminal equipment sends a random access preamble sequence to the network equipment.

In a possible implementation manner of the third aspect, the terminal device sends the first uplink data to the network device through a first uplink data channel, where a time-frequency resource of the first uplink data channel is indicated by a first RRC message. In this possible implementation manner, the time-frequency resource of the first uplink data channel is an unlicensed resource configured for the terminal device by the network device through the first RRC message. And the terminal equipment sends a first uplink data channel to the network equipment on the authorization-free resource.

In a fourth aspect, the present application provides a method for uplink data transmission, where an execution subject of the method is a network device or a module in the network device. The description is made taking a network device as an execution subject. The network equipment receives first uplink data from the terminal equipment; the network equipment sends first indication information to the terminal equipment, wherein the first indication information indicates the feedback information of the first uplink data; and when the first indication information meets a second condition, the network equipment receives a random access preamble sequence from the terminal equipment.

In a possible implementation manner of the fourth aspect, the network device receives first uplink data from the terminal device through a first uplink data channel, where a time-frequency resource of the first uplink data channel is indicated by a first RRC message. In this possible implementation manner, the time-frequency resource of the first uplink data channel is an unlicensed resource configured for the terminal device by the network device through the first RRC message. The network device receives a first uplink data channel from the terminal device on the unlicensed resource.

In a possible implementation manner of the first aspect, the second aspect, the third aspect, or the fourth aspect, the method further includes: the first indication information further indicates an index of the random access preamble sequence.

In a fifth aspect, a method for uplink data transmission is provided, where an execution subject of the method is a terminal device or a module in the terminal device. The description is made taking a terminal device as an execution subject. The terminal equipment sends first uplink data to the network equipment; the terminal equipment receives first indication information from the network equipment, wherein the first indication information indicates feedback information of first uplink data; and when the first indication information meets a sixth condition, the terminal equipment sends a random access preamble sequence and third uplink data (message A) to the network equipment, and the terminal equipment receives feedback information (message B) of the network equipment to the third uplink data.

By implementing the method described in the fifth aspect, the terminal device may determine the manner of uplink data transmission through the first indication information. And when the first indication information meets the sixth condition, the terminal equipment performs random access by using a two-step access method. At this time, the network device may determine the TA according to the random access preamble sequence sent by the terminal device; meanwhile, the terminal device carries third uplink data in the random access process, and the third uplink data carried in the process can use a modulation coding mode with high reliability, so that the reliability of data transmission is improved.

In a sixth aspect, the present application provides a method for uplink data transmission, where an execution subject of the method is a network device or a module in the network device. The description is made taking a network device as an execution subject. The network equipment receives first uplink data from the terminal equipment; the network equipment sends first indication information to the terminal equipment, wherein the first indication information indicates the feedback information of the first uplink data; when the first indication information satisfies the sixth condition: the network equipment receives a random access leader sequence and third uplink data (message A) from the terminal equipment; and the network equipment sends feedback information (message B) of the third uplink data to the terminal equipment.

In a seventh aspect, a method for uplink data transmission is provided, where an execution subject of the method is a terminal device or a module in the terminal device. The description is made taking a terminal device as an execution subject. The terminal equipment sends first uplink data to the network equipment; the terminal equipment receives first indication information from the network equipment, wherein the first indication information indicates feedback information of first uplink data; when the first indication information meets the seventh condition, the terminal equipment sends a random access leader sequence (message 1) to the network equipment; the terminal equipment receives a random access response (message 2) from the network equipment, wherein the random access response indicates a first uplink time-frequency resource; the terminal equipment sends fourth uplink data (message 3) on the first uplink time-frequency resource; and the terminal equipment receives the feedback information of the network equipment to the fourth uplink data (message 4).

By implementing the method described in the seventh aspect, the terminal device may determine the manner of uplink data transmission through the first indication information. And when the first indication information meets the seventh condition, the terminal equipment carries out random access by using a four-step access method. At this time, the network device may determine the TA according to the random access preamble sequence sent by the terminal device; meanwhile, the terminal device sends fourth uplink data to the network device in the process of random access, and the fourth uplink data carried by the terminal device can use a modulation coding mode with high reliability, so that the reliability of data transmission is improved.

In an eighth aspect, the present application provides a method for uplink data transmission, where an execution subject of the method is a network device or a module in the network device. The description is made taking a network device as an execution subject. The network equipment receives first uplink data from the terminal equipment; the network equipment sends first indication information to the terminal equipment, wherein the first indication information indicates the feedback information of the first uplink data; when the first indication information meets a seventh condition, the network equipment receives a random access preamble sequence (message 1) from the terminal equipment; the network equipment sends a random access response (message 2) to the terminal equipment, wherein the random access response indicates a first uplink time-frequency resource; the network equipment receives fourth uplink data (message 3) from the terminal equipment on the first uplink time-frequency resource; and the network equipment sends the feedback information of the fourth uplink data to the terminal equipment (message 4).

In a ninth aspect, a communication apparatus is provided, which may be a terminal device, an apparatus in a terminal device, or an apparatus capable of being used in cooperation with a terminal device. In one design, the apparatus includes a module that can perform one-to-one correspondence of the method/operation/step/action described in the foregoing first aspect, any possible implementation manner of the first aspect, the third aspect, any possible implementation manner of the third aspect, the fifth aspect, any possible implementation manner of the fifth aspect, the seventh aspect, or any possible implementation manner of the seventh aspect, and the module may be a hardware circuit, or may be software, or may be a hardware circuit and a software implementation. In one design, the apparatus may include a processing module and a communication module.

In a tenth aspect, a communication apparatus is provided, which may be a network device, an apparatus in a network device, or an apparatus capable of being used with a network device. In one design, the apparatus includes a module for implementing the one-to-one correspondence of the methods/operations/steps/actions described in the foregoing second aspect, any possible implementation manner of the second aspect, the fourth aspect, any possible implementation manner of the fourth aspect, the sixth aspect, any possible implementation manner of the sixth aspect, the eighth aspect, or any possible implementation manner of the eighth aspect. The module may be a hardware circuit, or may be a software, or may be implemented by a hardware circuit in combination with a software. In one design, the apparatus may include a processing module and a communication module.

In an eleventh aspect, a communication apparatus is provided, which includes a processor and is configured to implement the foregoing first aspect, the method in any possible implementation manner of the first aspect, the third aspect, the method in any possible implementation manner of the third aspect, the fifth aspect, the method in any possible implementation manner of the fifth aspect, and the method in any possible implementation manner of the seventh aspect. Optionally, the apparatus comprises a memory for storing instructions and/or data. The memory is coupled to the processor, and the processor, when executing the instructions stored in the memory, may implement the first aspect, the method in any possible implementation manner of the first aspect, the third aspect, the method in any possible implementation manner of the third aspect, the fifth aspect, the method in any possible implementation manner of the fifth aspect, and the method described in any possible implementation manner of the seventh aspect. The apparatus may also include a communication interface for transceiving information or data, which may be, for example, a transceiver, an interface circuit, a bus, a module, a pin, or other type of communication interface.

In one possible design, the communication device includes a processor and an interface circuit, the interface circuit is configured to receive a signal from another communication device other than the communication device and transmit the signal to the processor or transmit the signal from the processor to another communication device other than the communication device, and the processor is configured to implement, by logic circuits or executing code instructions, the method in the foregoing first aspect, any possible implementation manner of the first aspect, the method in the third aspect, any possible implementation manner of the third aspect, the method in the fifth aspect, any possible implementation manner of the fifth aspect, and the method in any possible implementation manner of the seventh aspect or the seventh aspect.

In a twelfth aspect, there is provided a communication apparatus comprising a processor configured to implement the second aspect, the method in any possible implementation manner of the second aspect, the fourth aspect, the method in any possible implementation manner of the fourth aspect, the sixth aspect, the method in any possible implementation manner of the eighth aspect, or the method in any possible implementation manner of the eighth aspect. Optionally, the apparatus comprises a memory for storing instructions and/or data. The memory is coupled to the processor, and the processor, when executing the instructions stored in the memory, may implement the second aspect, the method in any possible implementation manner of the second aspect, the fourth aspect, the method in any possible implementation manner of the fourth aspect, the sixth aspect, the method in any possible implementation manner of the eighth aspect, or the method in any possible implementation manner of the eighth aspect. The apparatus may also include a communication interface for transceiving information or data, which may be, for example, a transceiver, an interface circuit, a bus, a module, a pin, or other type of communication interface.

In one possible design, the communication device includes a processor and an interface circuit, the interface circuit is configured to receive and transmit signals from and to the other communication device except the communication device, and the processor is configured to implement the method in the second aspect, the method in any possible implementation manner of the second aspect, the fourth aspect, the method in any possible implementation manner of the fourth aspect, the sixth aspect, the method in any possible implementation manner of the eighth aspect, or the method in any possible implementation manner of the eighth aspect through logic circuits or execution of code instructions.

A thirteenth aspect provides a computer-readable storage medium having stored therein a computer program or instructions which, when executed, implement the above-mentioned first aspect, the method in any possible implementation of the first aspect, the method in the third aspect, any possible implementation of the third aspect, the method in the fifth aspect, any possible implementation of the fifth aspect, the method in the seventh aspect, or the method in any possible implementation of the seventh aspect.

In a fourteenth aspect, a computer readable storage medium is provided, having stored therein a computer program or instructions which, when executed, implement the foregoing second aspect, the method in any possible implementation of the second aspect, the fourth aspect, the method in any possible implementation of the fourth aspect, the sixth aspect, the method in any possible implementation of the eighth aspect, or the method in any possible implementation of the eighth aspect.

A fifteenth aspect provides a computer program product comprising instructions that, when executed, implement the above-mentioned first aspect, the method of any possible implementation of the first aspect, the third aspect, the method of any possible implementation of the third aspect, the fifth aspect, the method of any possible implementation of the seventh aspect, or the method of any possible implementation of the seventh aspect.

A sixteenth aspect provides a computer program product comprising instructions that, when executed, implement the method of the second aspect, the method of any possible implementation of the second aspect, the fourth aspect, the method of any possible implementation of the fourth aspect, the sixth aspect, the method of any possible implementation of the eighth aspect, or the method of any possible implementation of the eighth aspect.

A seventeenth aspect provides a computer program comprising code or instructions that, when executed, implements the above-described first aspect, the method of any possible implementation of the first aspect, the third aspect, the method of any possible implementation of the third aspect, the fifth aspect, the method of any possible implementation of the fifth aspect, the seventh aspect or the method of any possible implementation of the seventh aspect.

In an eighteenth aspect, there is provided a computer program comprising code or instructions which, when executed, implement the foregoing second aspect, the method of any possible implementation of the second aspect, the fourth aspect, the method of any possible implementation of the fourth aspect, the sixth aspect, the method of any possible implementation of the sixth aspect, the method of the eighth aspect, or the method of any possible implementation of the eighth aspect.

In a nineteenth aspect, a chip system is provided, where the chip system includes a processor and may further include a memory, and is configured to implement at least one of the methods described in the first to eighth aspects. The chip system may be formed by a chip, and may also include a chip and other discrete devices.

A twentieth aspect provides a communication system comprising the apparatus (e.g. terminal device) of the ninth or eleventh aspect and the apparatus (e.g. network device) of the tenth or twelfth aspect.

Drawings

Fig. 1 is a schematic architecture diagram of a communication system applied in an embodiment of the present application;

fig. 2-11 are schematic flow charts of uplink data transmission provided by an embodiment of the present application;

fig. 12 and 13 are schematic structural diagrams of a possible communication device provided in an embodiment of the present application.

Detailed Description

The technical scheme provided by the embodiment of the application can be applied to various communication systems, such as: a Long Term Evolution (LTE) system, a fifth generation (5G) mobile communication system, a wireless fidelity (WiFi) system, a future communication system, or a system in which multiple communication systems are integrated, which is not limited in the embodiments of the present application. Among them, 5G may also be referred to as New Radio (NR).

The technical scheme provided by the embodiment of the application can be applied to various communication scenes, for example, one or more of the following communication scenes: enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), Machine Type Communication (MTC), large-scale Machine Type Communication (MTC), device-to-device (D2D), vehicle-to-outside (V2X), vehicle-to-vehicle (V2V), and internet of things (IoT), among others.

The technical scheme provided by the embodiment of the application can be applied to communication among communication devices. The communication between the communication devices may include: communication between a network device and a terminal device, communication between a network device and a network device, and/or communication between a terminal device and a terminal device. In the embodiments of the present application, the term "communication" may also be described as "transmission", "information transmission", or "signal transmission", and the like. The transmission may include sending and/or receiving. In the embodiment of the present application, a technical solution is described by taking communication between a network device and a terminal device as an example, and those skilled in the art may also use the technical solution to perform communication between other scheduling entities and subordinate entities, for example, communication between a macro base station and a micro base station, for example, communication between a first terminal device and a second terminal device. The scheduling entity may allocate an air interface resource to the subordinate entity. The air interface resources include one or more of the following resources: time domain resources, frequency domain resources, code resources, and spatial resources. In the embodiments of the present application, the plurality of types may be two, three, four, or more, and the embodiments of the present application are not limited.

In this embodiment of the present application, the communication between the network device and the terminal device includes: the network device sends downlink signals/information to the terminal device, and/or the terminal device sends uplink signals/information to the network device.

In the embodiments of the present application, "/" may indicate a relationship in which the objects associated before and after are "or", for example, a/B may indicate a or B; "and/or" may be used to describe that there are three relationships for the associated object, e.g., A and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. In the embodiments of the present application, the terms "first", "second", and the like may be used to distinguish technical features having the same or similar functions. The terms "first", "second", and the like do not necessarily limit the number and execution order, and the terms "first", "second", and the like do not necessarily differ. In the embodiments of the present application, the words "exemplary" or "such as" are used to mean examples, illustrations or illustrations, and embodiments or designs described as "exemplary" or "such as" are not to be construed as preferred or advantageous over other embodiments or designs. The use of the terms "exemplary" or "such as" are intended to present relevant concepts in a concrete fashion for ease of understanding.

Fig. 1 is an architecture diagram of a communication system to which embodiments of the present application may be applied. As shown in fig. 1, the communication system includes a network device 110 and at least one terminal device (e.g., terminal device 120 and terminal device 130 in fig. 1). Illustratively, the network device 110 may include a radio frequency unit and a baseband unit. For uplink data transmission, the baseband unit may include at least one of a demodulation module, a de-rate matching module, and a channel decoding module. Illustratively, terminal devices (such as terminal device 120 and terminal device 130 in fig. 1) may include a baseband unit and a radio frequency unit. For uplink data transmission, the baseband unit may include at least one of a channel coding module, a rate matching module, and a modulation module. The channel coding module may be implemented by an encoder for encoding an information bit sequence and generating an encoded bit sequence, the encoded bit sequence comprising information bits and redundant bits. The rate matching module is used for repeating or punching the bits in the coded bit sequence to ensure that the length of the bit sequence after rate matching is matched with the transmission resource. The modulation module is configured to modulate and map the bit sequence obtained after rate matching into complex-valued modulation symbols (complex-valued modulation symbols), so as to improve transmission efficiency. The functions of the demodulation module, the de-rate matching module and the channel decoding module are respectively the inverse processes of the functions of the modulation module, the rate matching module and the channel coding module. Fig. 1 is a schematic diagram, and the embodiment of the present application does not limit the number of network devices and terminal devices included in the communication system.

The network equipment and the terminal equipment can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; can be deployed on the water surface; alternatively, it may be deployed on an airborne airplane, balloon, or artificial satellite. The embodiment of the application does not limit the application scenarios of the network device and the terminal device.

The network device and the terminal device may communicate with each other via a licensed spectrum, may communicate via an unlicensed spectrum (unlicensed spectrum), or may communicate via both the licensed spectrum and the unlicensed spectrum. The network device and the terminal device may communicate with each other through a frequency spectrum of 6 gigahertz (GHz) or less, through a frequency spectrum of 6GHz or more, or through a frequency spectrum of 6GHz or less and a frequency spectrum of 6GHz or more. The embodiments of the present application do not limit the spectrum resources used between the network device and the terminal device.

The terminal device related to the embodiments of the present application may also be referred to as a terminal, and may be a device having a wireless transceiving function). The terminal device may be a User Equipment (UE) including a handheld device, a vehicle-mounted device, a wearable device, or a computing device having wireless communication capabilities. Illustratively, the UE may be a mobile phone, a tablet computer, or a computer with wireless transceiving function. The terminal device may also be a virtual reality terminal device, an augmented reality terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in a smart city, and/or a wireless terminal in a smart home, etc.

In the embodiment of the present application, the apparatus for implementing the function of the terminal device may be the terminal device; it may also be a device, such as a chip system, capable of supporting the terminal device to realize the function, and the device may be installed in the terminal device or used in cooperation with the terminal device. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a terminal device is taken as an example, and the technical solution provided in the embodiment of the present application is described.

The network device related to the embodiment of the present application includes a Base Station (BS), which may be a device deployed in a radio access network and capable of performing wireless communication with a terminal device. The base station may have various forms, such as a macro base station, a micro base station, a relay station, an access point, and the like. The base station related to the embodiment of the present application may be a base station in a 5G system or a base station in an LTE system, where the base station in the 5G system may also be referred to as a Transmission Reception Point (TRP) or a next generation Node B (generation Node B, gNB, or gnnodeb). In the embodiment of the present application, the apparatus for implementing the function of the network device may be a network device; it may also be a device, such as a chip system, capable of supporting the network device to implement the function, and the device may be installed in the network device or used in cooperation with the network device. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a network device is taken as an example of a network device, and the technical solution provided in the embodiment of the present application is described.

In a communication system, a terminal device may access a network device and communicate with the network device. Illustratively, a network device may manage one or more (e.g., 3 or 6, etc.) cells, and a terminal device may access the network device in at least one of the one or more cells and communicate with the network device in the cell in which the terminal device is located. In the embodiments of the present application, at least one of them may be 1,2,3 or more, and the embodiments of the present application are not limited.

In some possible communication scenarios, the data packets transmitted between the terminal device and the network device are small. For many typical applications in intelligent factories, for example, the downlink data packets are mostly control signaling or management signaling, and the uplink data packets are mostly feedback information after some actions are performed, simple location update messages, or information collected from the outside, and these data packets are only a few bytes to a few tens of bytes. These packets are usually bursty and, because of their small size, can be transmitted in one Transport Block (TB) or one time slot.

In a possible implementation manner, when the terminal device needs to perform data transmission specific to the terminal device with the network device, the terminal device needs to be in a radio resource control CONNECTED (RRC _ CONNECTED) state. In the embodiment of the present application, when the terminal device is in the RRC _ CONNECTED state, there is an RRC connection between the terminal device and the network device. At this time, the network device knows that the terminal device is in the coverage or management range of the network device, for example, the network device knows that the terminal device is in the coverage of the cell managed by the network device; the core network knows which network device the terminal device is within its coverage or management range and the core network knows by which network device the terminal device can be located or found.

For the bursty packet transmission scenario, when there is no data transmission between the terminal device and the network device, in order to save power consumption of the terminal device, the terminal device may be converted into a radio resource control _ INACTIVE (RRC _ INACTIVE) state. In the embodiment of the present application, when the terminal device is in the RRC _ INACTIVE state, there is no RRC connection between the terminal device and the network device. At this time, the network device does not know whether the terminal device is in the coverage or management range of the network device, for example, the network device does not know whether the terminal device is in the coverage of the cell managed by the network device; the core network knows which network device the terminal device is within its coverage or management range and the core network knows by which network device the terminal device can be located or found. When the terminal device is in the RRC _ INACTIVE state, the terminal device may receive a paging message, a synchronization signal, a broadcast message, and/or system information, etc. from the network device.

In a possible implementation, when the terminal device is in the RRC _ INACTIVE state, if the terminal device needs to perform specific data transmission with the network device, in order to avoid power consumption and signaling overhead caused by the fact that the terminal device is first switched to the RRC _ CONNECTED state and then performs data transmission, the terminal device is allowed to perform the specific data transmission with the network device in the RRC _ INACTIVE state. It should be understood that the method provided by the embodiment of the present application is not limited to the above-described packet transmission scenario, and may also be used for data packet transmission with other sizes or data packet transmission with other scenarios, so as to reduce signaling overhead.

One implementation manner of the terminal device performing uplink data transmission with the network device in the RRC _ INACTIVE state may be grant free transmission (grant free), that is, the terminal device sends uplink data to the network device using a grant free resource. In the grant-free transmission, the uplink transmission of the terminal device does not need to be completed by scheduling of the network device. For example, when uplink data arrives, the terminal device does not need to send a Scheduling Request (SR) to the network device and wait for a dynamic grant (dynamic grant) of the network device, but may directly send the uplink data to the network device using a transmission resource pre-allocated by the network device and a specified transmission parameter. In the embodiment of the present application, "unlicensed transmission" is also referred to as "unlicensed scheduling" or "Configured Grant (CG)". When the terminal device uses the unlicensed resource to perform uplink data transmission, how to improve the accuracy of data transmission is an urgent problem to be solved.

In order to solve the above technical problem, the embodiments of the present application provide the following two solutions:

in the first solution, when the terminal device uses the unlicensed resource to perform uplink data transmission unsuccessfully, the terminal device may perform retransmission, and new transmission and retransmission of uplink data may perform HARQ combining on the network device side, thereby improving the transmission success rate. In the second solution, when the terminal device does not successfully perform uplink data transmission using the unlicensed resource, the network device may enable the terminal device to perform uplink data transmission with the network device through a random access process.

In the first solution, how to perform retransmission becomes a problem to be solved urgently, and to solve the problem, embodiments of the present application provide a method for uplink data transmission.

The technical solutions of the embodiments of the present application are described in detail below with some embodiments. In the embodiment of the present application, when the terminal device sends uplink data to the network device, the terminal device may be in an RRC _ INACTIVE state. However, it is not excluded that these embodiments may be used for other RRC states of the terminal device, for example, may be used for whether the terminal device is in an RRC _ CONNECTED state or an RRC idle state.

In the embodiment of the present application, when the terminal device is in the RRC idle state, there is no RRC connection between the terminal device and the network device. At this time, the network device does not know whether the terminal device is in the coverage of the network device or in the management range of the network device, for example, the network device does not know whether the terminal device is in the coverage of the cell managed by the network device; the core network does not know which network device the terminal device is within its coverage or management range, and the core network does not know through which network device the terminal device can be located or found. When the terminal device is in the RRC idle state, the terminal device may receive a paging message, a synchronization signal, a broadcast message, and/or system information, etc. from the network device.

Fig. 2 is a schematic flowchart of an uplink data transmission method provided in an embodiment of the present application, where the embodiment relates to a specific process of performing uplink data transmission between a network device and a terminal device. As shown in fig. 2, the method may include: s101, S102 and S103 a.

S101, the terminal equipment sends first uplink data to the network equipment. Correspondingly, the network device receives the first uplink data.

The terminal device may send the first uplink data to the network device through the first uplink data channel. Illustratively, the terminal device sends a first uplink data channel to the network device, where the first uplink data channel carries first uplink data. Correspondingly, the network device receives the first uplink data channel, thereby receiving the first uplink data.

Optionally, the first uplink data channel is a Physical Uplink Shared Channel (PUSCH). It is to be understood that, in the embodiment of the present application, a Physical Downlink Shared Channel (PDSCH), a PUSCH, a Physical Downlink Control Channel (PDCCH), and a Physical Uplink Control Channel (PUCCH) are only examples of a downlink data channel, an uplink data channel, a downlink control channel, and an uplink control channel, respectively, and in different systems and different scenarios, the data channel and the control channel may have different names, which is not limited in the embodiment of the present application.

Optionally, the time-frequency resource of the first uplink data channel is indicated by a Radio Resource Control (RRC) message. Specifically, the time-frequency resource of the first uplink data channel is an authorization-free resource configured for the terminal device by the network device through the first RRC message. And the terminal equipment sends a first uplink data channel to the network equipment on the authorization-free resource.

In the embodiments of the present application, the unlicensed resources may be classified into the following two types.

A first type of unlicensed resource: the network device configures, for the terminal device, transmission parameters of the unlicensed resource through parameters (e.g., ConfiguredGrantConfig) in the RRC message, for example, one or more of the following parameters for configuring an uplink data channel: a period, an open loop power control related parameter, a waveform, a redundancy version sequence, a repetition number, a frequency hopping pattern, a Resource allocation type, a hybrid automatic repeat request (HARQ) process number, a demodulation reference signal (DMRS) related parameter, a Modulation and Coding Scheme (MCS) table, a Resource Block Group (RBG) size, a time domain Resource position, a frequency domain Resource position, and an MCS.

A second type of unlicensed resource: the network device configures some or all transmission parameters, for example, one or more of the following parameters for configuring the uplink data channel, to the terminal device through the RRC message: the method comprises the steps of determining the period of time domain resources, related parameters of open loop power control, waveforms, redundancy versions, sequences of the redundancy versions, repetition times, a frequency hopping mode, resource allocation types, MCS tables, related parameters of DMRS and HARQ process numbers; the network device sends physical layer signaling, such as Downlink Control Information (DCI), to the terminal device to activate the second type of unlicensed resource. Optionally, the DCI may also be used to configure partial transmission parameters, for example, configure one or more of the following parameters of an uplink data channel: time domain resource location, frequency domain resource location, DMRS related parameters, and MCS. The DCI may be carried through a PDCCH.

When the terminal device uses the two types of authorization-free resources for uplink transmission, the terminal device can directly use the authorization-free resources pre-configured by the network device to send uplink data to the network device, without sending an SR to the network device and waiting for dynamic authorization of the network device. It should be noted that the second type of unlicensed resource needs to be activated by physical layer signaling before being used by the terminal device.

Optionally, the first uplink data in step S101 is specific information or unicast information of the terminal device. In an embodiment of the present application, the terminal device may send terminal device specific information or unicast information to the network device through a terminal device specific data channel, for example, the terminal device may send a terminal device specific PUSCH to the network device.

Illustratively, the terminal device specific PUSCH satisfies one or more of the following conditions: the transmission parameter of the PUSCH is specific to the terminal device or specific to a terminal device group in which the terminal device is located; the PUSCH is activated by the terminal device specific PDCCH; cyclic Redundancy Check (CRC) check (parity) bits of the PUSCH are scrambled by the identity of the terminal device; and the information carried on the PUSCH is specific to the terminal equipment or specific to the terminal equipment group in which the terminal equipment is positioned.

Illustratively, the terminal device-specific PDCCH described above satisfies one or more of the following conditions: the resource location of the PDCCH is specific to the terminal device; CRC check bits of the PDCCH are scrambled by the identification of the terminal equipment; and the PDCCH is used for scheduling the terminal device specific PUSCH, for example, the PDCCH carries transmission parameters of the PUSCH, including at least one of a time domain resource location, a frequency domain resource location, an MCS, a modulation mechanism, a coding mechanism, a Transport Block Size (TBS), an RV, a frequency hopping indication, and a power control command.

In this embodiment of the present application, the identifier of the terminal device may be a cell radio network temporary identifier (C-RNTI), a semi-persistent scheduling (SPS) RNTI, or another type of Radio Network Temporary Identifier (RNTI) of the terminal device, which is not limited in this embodiment of the present application.

S102, the network equipment sends first indication information to the terminal equipment. Correspondingly, the terminal equipment receives the first indication information from the network equipment.

Optionally, in an embodiment of the present application, the first indication information may be further described as: feedback information for the first uplink data. Optionally, the first uplink data is processed into a Transport Block (TB) and then transmitted on the first uplink data channel, where the feedback information of the first uplink data may also be understood as: feedback information of the TB.

S103a, when the first indication information meets the first condition, the terminal device sends the random access preamble sequence and the second uplink data to the network device. The method can also be described as operation 1: when the first indication information satisfies the first condition, the network device indicates the case 1 to the terminal device. Case 1 can be described as: and the terminal equipment sends the random access leader sequence and the second uplink data to the network equipment.

In an embodiment of the present application, a terminal device may send a random access preamble sequence to a network device on a Physical Random Access Channel (PRACH), where the random access preamble sequence is used for accessing the network device or performing uplink synchronization with the network device. In this embodiment of the present application, the random access preamble sequence may also be referred to as an access preamble, an access preamble sequence, a random access preamble, or a preamble, which is not limited in this embodiment of the present application.

Optionally, the first indication information indicates an index of the random access preamble sequence, and the terminal device determines a sequence value of the random access preamble sequence according to the index. Illustratively, in the cell, the network device configures a set of random access preamble sequences for the terminal device, where the set of random access preamble sequences includes one or more random access preamble sequences, each random access preamble sequence in the set of random access preamble sequences corresponds to one index, the first indication information may indicate an index of one random access preamble sequence from the set of random access preamble sequences, and the terminal device sends the indicated random access preamble sequence to the network device.

Illustratively, the type of the random access preamble sequence is a ZC (Zadoff-Chu) sequence. For a cell, a network device may allocate a logical root sequence number (local root sequence number) of a ZC root sequence to the cell, where the logical root sequence number corresponds to a physical root sequence number (physical root sequence number), the physical root sequence number may be used to generate the ZC root sequence, and a random access preamble sequence of the cell is generated according to the ZC root sequence. The correspondence between the logical root sequence number and the physical root sequence number may be described in a logical root sequence number schedule table.

Taking the length Nzc of the random access preamble sequence equal to 139 as an example, table 1 shows a logical root sequence number planning table defined by a protocol, and in table 1, the logical root sequence number and the physical root sequence number are in one-to-one correspondence.

TABLE 1

The terminal device may obtain a random access preamble sequence set of a cell by performing Cyclic Shift (CS) on a ZC root sequence, in the following manner:

the terminal device reads the system parameters of the cell, determines the logical root serial number of the cell from the system parameters of the cell, and can obtain the corresponding physical root serial number according to the logical root serial number. For example, by looking up table 1, if the logical root sequence number is 0, the corresponding physical root sequence number is 1, and if the logical root sequence number is 1, the corresponding physical root sequence number is 138. The terminal equipment determines a corresponding ZC root sequence according to the physical root sequence number; the terminal device may generate a sequence using all available cyclic shifts for this ZC root sequence. For example, for one cell, the random access preamble sequence generated using the cyclic shift of the ZC root sequence can be represented as:

x _u,v (n)＝x _u ((n+C _v )mod Nzc)

wherein:

x _u is ZC root sequence, u is physical root sequence number determined according to logical root sequence number, and Nzc is ZC root sequence x _u Length of (C) _v For cyclic shift values, j is an imaginary unit whose square is equal to-1 and π is the circumferential ratio.

If one ZC root sequence is not sufficient to generate the number of random access preamble sequences required for the cell (e.g., 64, 128, or other values), the terminal device may determine a next logical root sequence number consecutive to the logical root sequence number according to the logical root sequence number, and continue to generate the random access preamble sequences using the ZC root sequence corresponding to the next logical root sequence number until the number of random access preamble sequences required for the cell is generated. The number of random access preamble sequences required by the cell can be considered as follows: in the cell, the network device configures a set of random access preamble sequences for the terminal device.

Alternatively, the terminal device may send the determined random access preamble sequence to the network device on a PRACH opportunity (RO). Wherein the RO includes a time-frequency resource for transmitting a random access preamble sequence. In the embodiment of the present application, the terminal device determines the RO in the following three ways:

in a first mode, the first indication information indicates an RO of the random access preamble sequence. Illustratively, the network device configures a group of ROs for the terminal device, the group of ROs including one or more ROs, each RO in the group of ROs corresponding to an index, the first indication information may indicate the index of one of the ROs from the group of ROs, and the terminal device sends the random access preamble sequence to the network device on the indicated RO.

In the second mode, the network device configures a group of ROs for the terminal device, where the group of ROs includes one or more ROs. The terminal device randomly selects one RO from the set of ROs, and transmits a random access preamble sequence to the network device on the selected RO.

In a third mode, the first indication information indicates an index of the random access preamble sequence, and the terminal device determines an RO for transmitting the random access preamble sequence according to the index. Illustratively, the network device configures a group of ROs for the terminal device, each RO may carry one or more random access preamble sequences, each random access preamble sequence in all random access preamble sequences carried by the group of ROs corresponds to an index, and the indexes corresponding to each random access preamble sequence are different from each other. And the terminal equipment determines the RO where the random access preamble sequence is located according to the index of the random access preamble sequence carried by the first indication information, a group of ROs configured by the network equipment and the index corresponding to each random access preamble sequence carried by the group of ROs. For example, the network device configures a set of ROs for the terminal device, the set of ROs sharing two ROs, a first RO and a second RO, respectively. The first RO carries 64 random access preamble sequences, and the corresponding indices of the 64 random access preamble sequences are 0 to 63. The second RO carries 64 random access preamble sequences, and the corresponding indices of the 64 random access preamble sequences are 64 to 127. If the index of the random access preamble sequence indicated by the first indication information by the network device is 70, it indicates that the network device instructs the terminal device to transmit the random access preamble sequence using the second RO.

The terminal device may determine the RO using, but not limited to, any of the three manners described above, and after determining the RO, the terminal device transmits the random access preamble sequence described above to the network device on the RO.

In an embodiment of the present application, the second uplink data is retransmission data of the first uplink data. The second uplink data may carry part or all of the data of the first uplink data. Optionally, the first uplink data and the second uplink data are both channel-coded and rate-matched data, where a Redundancy Version (RV) of the second uplink data is different from a redundancy version of the first uplink data. In this embodiment, the first uplink data and the second uplink data are both data obtained by performing channel coding and rate matching on the first bit sequence. In this embodiment of the present application, the fact that the second uplink data is retransmission data of the first uplink data may also be understood as: the second uplink data is retransmission data of the first bit sequence.

Illustratively, the terminal device uses an encoder to perform channel coding on a first bit sequence with the length of a bits, obtains a sequence with the length of b bits after the channel coding, and places the sequence with the length of b bits in a buffer. Each RV defines a different starting point, and the initial transmission (new transmission) and the retransmission of the data use different RVs (i.e., different starting points). The initial transmission and each retransmission are respectively started from the corresponding starting point, and the bits are read in the buffer bit by bit until the required bit number is reached. When the tail of the buffer is read and the required bit number is not reached yet, the head of the buffer is jumped to continue reading. The required bit number is determined according to the resource size and the modulation mode of the physical channel carrying the data. In an embodiment of the present application, the second uplink data is carried on a second uplink data channel. Optionally, the second uplink data channel is a PUSCH. And the terminal equipment determines the time-frequency resource of the second uplink data channel and sends the second uplink data channel to the network equipment on the time-frequency resource. The following four ways for the terminal device to determine the time-frequency resource of the second uplink data channel are provided:

the determination method is as follows: the terminal device determines the time-frequency resource of the second uplink data channel according to the random access preamble sequence in step S103a and the mapping relationship between the random access preamble sequence and the time-frequency resource of the uplink data channel.

The mapping relation between the time-frequency resources of the random access preamble sequence and the uplink data channel comprises the following steps: one or more of the RO where the random access leader sequence is located, the root sequence number of the random access leader sequence and the cyclic shift value of the random access leader sequence, and the mapping relation between the time-frequency resources of the uplink data channel. For example, the mapping relationship may be any one of the following. Optionally, the mapping relationship may be preset by a protocol or indicated to the terminal device by the network device through the second RRC message.

Mapping relation one: and randomly accessing the mapping relation between the RO where the leader sequence is located and the time frequency resources of the uplink data channel.

Illustratively, the terminal device determines the RO as described above. The terminal device may determine the time-frequency resource of the second uplink data channel according to the determined RO and the mapping relation one (e.g., table 2). Correspondingly, the network device determines the time-frequency resource of the second uplink data channel according to the RO and the first mapping relation, and receives the second uplink data channel on the determined time-frequency resource.

Table 2 mapping relationship between RO where random access preamble sequence is located and time frequency resource of uplink data channel

RO	Time frequency resource of uplink data channel corresponding to RO
RO A	Time frequency resource A
RO B	Time frequency resource B

The mapping relationship is two: and mapping relation between the root sequence number of the random access leader sequence and the time frequency resource of the uplink data channel. The root sequence number of the random access preamble sequence may be a physical root sequence number or a logical root sequence number, which is not limited in this embodiment.

Illustratively, the root sequence number of the random access preamble sequence is configured for the terminal device by the network device through higher layer parameters. The terminal device may determine the time-frequency resource of the second uplink data channel according to the root sequence number of the random access preamble sequence and the second mapping relationship (e.g., table 3). Correspondingly, the network device determines the time frequency resource of the second uplink data channel according to the root sequence number of the random access leader sequence and the second mapping relation, and receives the second uplink data channel on the determined time frequency resource.

TABLE 3 mapping relationship between root sequence number of random access preamble sequence and time-frequency resource of uplink data channel

Root sequence number	Time frequency resource of uplink data channel corresponding to root sequence number
Sequence number A	Time frequency resource A
Sequence number B	Time frequency resource B

The mapping relation is three: the mapping relation between the root sequence number of the random access leader sequence, the cyclic shift value of the random access leader sequence and the time frequency resource of the uplink data channel. The root sequence number of the random access leader sequence and the cyclic shift value of the random access leader sequence may be configured by the network device for the terminal device, or may be selected by the terminal device itself.

Illustratively, the terminal device may determine the time-frequency resource of the second uplink data channel according to the root sequence number of the random access preamble sequence, the cyclic shift value of the random access preamble sequence, and the mapping relationship three (e.g., table 4). Correspondingly, the network equipment determines the time-frequency resource of the second uplink data channel according to the root sequence number of the random access leader sequence, the cyclic shift value of the random access leader sequence and the mapping relation III, and receives the second uplink data channel on the determined time-frequency resource.

TABLE 4 mapping relationship between the root sequence number of the random access leader sequence, the cyclic shift value of the random access leader sequence and the time frequency resource of the uplink data channel

Root sequence number	Cyclic shift value	Time-frequency resource of uplink data channel
Sequence number A	X	Time frequency resource A
Sequence number A	Y	Time frequency resource B
Sequence number B	X	Time frequency resource C
Sequence number B	Y	Time frequency resource D

Correspondingly, the network device may determine the time-frequency resource of the second uplink data channel according to the random access preamble sequence and the mapping relationship between the random access preamble sequence and the time-frequency resource of the uplink data channel. The network device may also determine the time-frequency resource of the second uplink data channel, then determine the random access preamble sequence according to the time-frequency resource of the second uplink data channel and the mapping relationship between the random access preamble sequence and the time-frequency resource of the uplink data channel, and further determine an index of the random access preamble sequence, and send the index to the terminal device.

Determining a second mode: the first indication information also indicates time domain resources and/or frequency domain resources of the second uplink data channel, and the terminal equipment determines the time frequency resources of the second uplink data channel according to the first indication information.

In embodiments of the present application, the time domain resource of a channel or information may be one or more of the following parameters for transmitting the channel or information: radio frame, subframe, slot, subslot, minislot, period, symbol, and so on.

In embodiments of the present application, the frequency domain resources of a channel or information may be one or more of the following parameters for transmitting the channel or information: bandwidth part (BWP), Resource Block Group (RBG), Resource Block (RB), and subcarrier, etc.

Specifically, the manner in which the first indication information indicates the time domain resource and/or the frequency domain resource of the second uplink data channel includes, but is not limited to, the following three manners: the first indication information indicates the time domain resource position of the second uplink data channel, and the frequency domain resource position of the second uplink data channel is pre-configured; or the first indication information indicates the frequency domain resource position of the second uplink data channel, and the time domain resource position of the second uplink data channel is pre-configured; or, the first indication information indicates a time domain resource position of the second uplink data channel and a frequency domain resource position of the second uplink data channel.

Determining a third mode: the terminal device receives second indication information from the network device, the second indication information indicates a time domain resource and/or a frequency domain resource of a second uplink data channel, the second uplink data channel carries second uplink data, and the terminal device sends the second uplink data to the network device on the time frequency resource of the second uplink data channel. Optionally, the second indication information is a fourth RRC message or DCI. Wherein the fourth RRC message is different from the first RRC message.

Exemplarily, in the third determination mode, the second indication information indicates a time domain resource of the second uplink data channel, and the frequency domain resource of the second uplink data channel is preconfigured; the second indication information indicates frequency domain resources of a second uplink data channel, and time domain resources of the second uplink data channel are pre-configured; or the second indication information indicates time-frequency resources of the second uplink data channel.

Determining a mode four: the time-frequency resource of the second uplink data channel is indicated by the first RRC message. Specifically, the time-frequency resource of the second uplink data channel is an unlicensed resource configured for the terminal device by the network device through the parameter in the first RRC message. And the terminal equipment determines the time-frequency resource of the second uplink data channel through the first RRC message.

The terminal device may determine the time-frequency resource of the second uplink data channel based on any one of the four determination manners, and send the second uplink data to the network device on the time-frequency resource.

Optionally, the terminal device may further send the random access preamble sequence and the second uplink data to the network device by: the random access preamble sequence, the RO for transmitting the random access preamble sequence, and the configuration information of the time-frequency resource of the second uplink data channel are broadcasted to the terminal device by the network device through a System Information Block (SIB) message. For example, the SIB message carries a configuration table, where the configuration table includes multiple sets of the above configuration information, and the network device indicates one set of the configuration information to the terminal device through the first indication information. For example, the network device indicates, to the terminal device, a number of a set in the configuration table through the first indication information. The terminal equipment obtains the configuration information through the serial number, determines RO, the random access leader sequence and the time frequency resource of the second uplink data channel through the configuration information, sends the random access leader sequence on the RO, and sends the second uplink data on the time frequency resource of the second uplink data channel.

Optionally, S103a further includes at least one of the following operations:

operation 2: when the first indication information satisfies the second condition, the network device indicates the case 2 to the terminal device. Case 2 can be described as: the terminal device sends a random access preamble sequence to the network device, where the method for the terminal device to determine the random access preamble sequence may refer to the foregoing description;

operation 3: when the first indication information satisfies the third condition, the network device indicates a case 3 to the terminal device. Case 3 can be described as: and the terminal equipment sends second uplink data to the network equipment through a second uplink data channel. And the time frequency resource of the second uplink data channel is the time frequency resource scheduled by the network equipment through the signaling. The method for determining the time-frequency resource of the second uplink data channel by the terminal device may refer to the second determination method or the third determination method in the foregoing;

and operation 4: when the first indication information satisfies the fourth condition, the network device indicates the condition 4 to the terminal device. Case 4 can be described as: and the terminal equipment sends second uplink data to the network equipment through a second uplink data channel. And the time-frequency resource of the second uplink data channel is an authorization-free resource configured in advance by the network equipment. The method for the terminal device to determine the time-frequency resource of the second uplink data channel may refer to the fourth determination method in the foregoing;

operation 5: when the first indication information satisfies the fifth condition, the network device indicates a situation 5 to the terminal device. Case 5 can be described as: and the terminal equipment correctly receives the first uplink data from the terminal equipment.

In the above method, the reason why the network device indicates other situations to the terminal device besides the situation 5 may be: the network device does not correctly receive the first uplink data from the terminal device, but the embodiment of the present application is not limited thereto.

Specifically, S103a may include one, two, three, or four of operation 2, operation 3, operation 4, and operation 5, in addition to operation 1:

in a first alternative, S103a may include one of operation 2, operation 3, operation 4, and operation 5 in addition to operation 1, and there are four possible implementation methods. Fig. 3 shows one possible implementation method: s103a includes operation 5 in addition to operation 1. Three other possible implementations are shown with reference to fig. 3, which are not shown one by one.

In a second alternative, S103a may include two of operation 2, operation 3, operation 4, and operation 5 in addition to operation 1, and there are six possible implementation methods. Fig. 4 shows one possible implementation method: s103a includes operation 4 and operation 5 in addition to operation 1. Other five possible implementations are shown with reference to fig. 4, and are not shown one by one here.

In a third alternative, S103a may include three of operation 2, operation 3, operation 4, and operation 5 in addition to operation 1, and there are four possible implementation methods. Fig. 5 shows one possible implementation method: s103a includes operation 3, operation 4, and operation 5 in addition to operation 1. Three other possible implementations are shown with reference to fig. 5, which are not shown one by one here.

In a fourth alternative, S103a may include four operations, i.e., operation 2, operation 3, operation 4, and operation 5, in addition to operation 1, and share one possible implementation method. As shown in fig. 6, S103a includes operation 2, operation 3, operation 4, and operation 5 in addition to operation 1.

Another possible implementation method is: s103a includes only operation 1. In this possible implementation method, when the first indication information satisfies the first condition, the network device instructs the terminal device to send the random access preamble sequence and the second uplink data to the network device. When the terminal equipment does not receive the first indication information; or, when the terminal device does not receive the first indication information in time unit n + k, the terminal device considers that the first uplink data is correctly received by the network device. Wherein n is the number of a time unit for the terminal device to send the first uplink data to the network device, n, k are non-negative integers, and the time unit may be a timeslot, a sub-timeslot, a mini-timeslot, a subframe, or the like.

From the above description, it can be understood that there are 16 possible implementation methods for S103a, which are 4+6+4+1+ 1. In each of the 16 possible implementation methods, the network device may indicate one of the N candidate cases to the terminal device through the first indication information. Wherein N is a positive integer greater than or equal to 1. Specifically, the first indication information may indicate one of the N candidate cases to the terminal device explicitly or implicitly.

The indication method is as follows: the first indication information explicitly indicates for the terminal device one of N candidate cases:

the first indication information includes a first bit field including M bits,

wherein M, N is a positive integer, N represents the number of all possible situations indicated by the network device through the first indication information,

meaning rounding up. And when the bit value of the first bit field is L, indicating that the network equipment indicates the L +1 th case for the terminal equipment from the N candidate cases, wherein L is an integer and is more than or equal to 0 and less than N.

Taking the method shown in fig. 3 as an example, the network device may indicate one of the cases 1 and 5 to the terminal device from 2 candidate cases through the first indication information. At this time, M is 1, that is, the first bit field includes 1 bit. In an optional manner, when the value of the bit is "0", it indicates that the network device indicates the terminal device that the situation is 1, and when the value of the bit is "1", it indicates that the network device indicates the situation is 5. In this case, the first condition is that the value of the M bit is "0", and the fifth condition is that the value of the M bit is "1". In another alternative, when the value of the bit is "1", it indicates that the network device indicates the situation 1 to the terminal device, and when the value of the bit is "0", it indicates that the network device indicates the situation 5 to the terminal device. In this case, the first condition is that the value of the M bit is "1", and the fifth condition is that the value of the M bit is "0".

Taking the method shown in fig. 4 as an example, the network device may indicate one of the 3 candidate cases, namely case 1, case 4 and case 5, to the terminal device through the first indication information. At this time, M is 2, that is, the first bit field includes 2 bits. The values of these 2 bits may be: "00", "01", "10" and "11", any 3 of these 4 values indicating case 1, case 4 and case 5, respectively. Possible combinations are shown in table 5, and in the embodiment of the present application, any one of the 24 combinations may be used, which is not limited by the embodiment of the present application. Take combination 1 in table 5 as an example: when the value of the 2 bits is "00", it indicates that the network device indicates the case 1 to the terminal device, when the value of the 2 bits is "01", it indicates that the network device indicates the case 4 to the terminal device, and when the value of the 2 bits is "10", it indicates that the network device indicates the case 5 to the terminal device. In this case, the first condition is that the value of the M bit is "00", the fourth condition is that the value of the M bit is 01, and the fifth condition is that the value of the M bit is "10".

TABLE 5

Taking the method shown in fig. 5 as an example, the network device may indicate one of the cases 1, 3, 4, and 5 to the terminal device from 4 candidate cases through the first indication information. At this time, M is 2, that is, the first bit field includes 2 bits. The values of these 2 bits may be: "00", "01", "10" and "11", the 4 values indicating case 1, case 3, case 4 and case 5, respectively. Possible combinations are shown in table 6, and in the embodiment of the present application, any one of the 24 combinations may be used, which is not limited by the embodiment of the present application. Take combination 1 in table 6 as an example: when the value of the 2 bits is "00", it indicates that the network device indicates the situation 1 to the terminal device, when the value of the 2 bits is "01", it indicates that the network device indicates the situation 3 to the terminal device, when the value of the 2 bits is "10", it indicates that the network device indicates the situation 4 to the terminal device, and when the value of the 2 bits is "11", it indicates that the network device indicates the situation 5 to the terminal device. In this case, the first condition is that the value of the M bit is "00", the third condition is that the value of the M bit is "01", the fourth condition is that the value of the M bit is "10", and the fifth condition is that the value of the M bit is "11".

TABLE 6

Taking the method shown in fig. 6 as an example, the network device may indicate one of the cases from 5 candidate cases, namely, case 1, case 2, case 3, case 4, and case 5, to the terminal device through the first indication information. At this time, M is 3, that is, the first bit field includes 3 bits. The values of the 3 bits are 8 values in total, which are respectively: "000", "001", "010", "011", "100", "101", "110" and "111". Similarly, it will be understood by those skilled in the art that when the 8 values of the 3 bits correspond to the 5 cases described above, the total number is

And (4) combination. In the embodiment of the present application, when M is 3, any one of the 6720 combinations described above may be used, and the embodiment of the present application does not limit this. One of these 6720 combinations may be: when the value of the 3 bits is "000", it indicates that the network device indicates the case 1 to the terminal device, when the value of the 3 bits is "001", it indicates that the network device indicates the case 2 to the terminal device, when the value of the 3 bits is "010", it indicates that the network device indicates the case 3 to the terminal device, when the value of the 3 bits is "011", it indicates that the network device indicates the case 4 to the terminal device, and when the value of the 3 bits is "100", it indicates that the network device indicates the case 5 to the terminal device. In this case, the first condition is that the value of the M bit is "000", the second condition is that the value of the M bit is "001", the third condition is that the value of the M bit is "010", the fourth condition is that the value of the M bit is "011", and the fifth condition is that the value of the M bit is "100".

Optionally, as described hereinbeforeIndication mode oneThe first indication information is a third RRC message or DCI. When the first indication information is a third RRC message, the third RRC message is different from the first RRC message, the third RRC message is different from the fourth RRC message, and the third RRC message may be the same as or different from the second RRC message. Optionally, the time-frequency resource carrying the first indication information may be notified to the terminal device by the network device through a signaling or preconfigured, and the embodiment of the application is not limited. For example, when the first indication information is DCI, the network device carries information of the time-frequency resource bearing the DCI in a first RRC message, and the terminal device acquires the time-frequency resource information of the DCI through the first RRC message; when the first indication information is the third RRC message, the network device sends DCI to the terminal device, where the DCI carries time-frequency resource information of the PDSCH carrying the third RRC message, and the device on the terminal obtains the time-frequency resource information of the PDSCH carrying the third RRC message through the DCI.

The second indication mode: the first indication information implicitly indicates one case for the terminal device from among the N candidate cases. Finger-shaped The second embodiment includes an indication mode 2.1 and an indication mode 2.2.

Indication mode 2.1: when the scrambling sequence used by the CRC check bit of the first indication information is an i-th Radio Network Temporary Identifier (RNTI), this indicates that the first indication information indication number i corresponds to the RNTI. Where i is used to denote the number of each of these N cases, and the value of i is 1,2,3.

Specifically, the first indication information may have N candidate scrambling sequences, which are: the 1 st RNTI and the 2 nd RNTI … are the Nth RNTIs. The mapping relationship between the N scrambling sequences and the N candidate cases may be preset by a protocol, or configured to the terminal device by the network device through RRC signaling or MAC signaling. The network device selects one scrambling sequence from the N candidate scrambling sequences to scramble CRC check bits of the first indication information. Correspondingly, when the terminal device receives the first indication information, the first indication information is blindly decoded, that is, the terminal device attempts to descramble the CRC check bits of the first indication information by using one or more scrambling sequences of the N candidate scrambling sequences. And when the terminal equipment uses the ith scrambling sequence to descramble the first indication information correctly, indicating that the network equipment indicates the condition i to the terminal equipment.

Taking the method shown in fig. 3 as an example, the network device may indicate one of the cases to the terminal device from 2 candidate cases, which are the case 1 and the case 5, through the first indication information. Alternatively, case 1 is numbered 1 and case 5 is numbered 2. When the scrambling sequence used by the first indication information is the 1 st RNTI, the indication that the network equipment indicates the situation 1 to the terminal equipment is shown, and when the scrambling sequence used by the first indication information is the 2 nd RNTI, the indication that the network equipment indicates the situation 5 to the terminal equipment is shown. In this case, the first condition is that the scrambling sequence used by the first instruction information is the 1 st RNTI, and the fifth condition is that the scrambling sequence used by the first instruction information is the 2 nd RNTI. Alternatively, case 1 is numbered 2 and case 5 is numbered 1. When the scrambling sequence used by the first indication information is the 1 st RNTI, the network device indicates the situation 5 to the terminal device, and when the scrambling sequence used by the first indication information is the 2 nd RNTI, the network device indicates the situation 1 to the terminal device. In this case, the first condition is that the scrambling sequence used by the first instruction information is the 2 nd RNTI, and the fifth condition is that the scrambling sequence used by the first instruction information is the 1 st RNTI.

Taking the method shown in fig. 4 as an example, the network device may indicate one of the cases 1, 4, and 5 to the terminal device through the first indication information. Alternatively, case 1 is numbered 1, case 4 is numbered 2, and case 5 is numbered 3. When the scrambling sequence used by the first indication information is the 1 st RNTI, the indication that the network equipment indicates the situation 1 to the terminal equipment is shown, when the scrambling sequence used by the first indication information is the 2 nd RNTI, the indication that the network equipment indicates the situation 4 to the terminal equipment is shown, and when the scrambling sequence used by the first indication information is the 3 rd RNTI, the indication that the network equipment indicates the situation 5 to the terminal equipment is shown. In this case, the first condition is that the scrambling sequence used by the first instruction information is the 1 st RNTI, the fourth condition is that the scrambling sequence used by the first instruction information is the 2 nd RNTI, and the fifth condition is that the scrambling sequence used by the first instruction information is the 3 rd RNTI. Those skilled in the art will appreciate that there are 6 total cases 1, 4 and 5 numbered, and the above numbering is only one example of these 6. In the other 5 numbering manners, the manner of the first indication information indication is similar to that of the first indication information indication in the above numbering manner, and is not described herein again.

Taking the method shown in fig. 5 as an example, the network device may indicate one of the cases 1, 3, 4, and 5 to the terminal device through the first indication information. Alternatively, case 1 is numbered 1, case 3 is numbered 2, case 4 is numbered 3, and case 5 is numbered 4. When the scrambling sequence used by the first indication information is the 1 st RNTI, the indication that the network equipment indicates the condition 1 to the terminal equipment is shown, when the scrambling sequence used by the first indication information is the 2 nd RNTI, the indication that the network equipment indicates the condition 3 to the terminal equipment is shown, when the scrambling sequence used by the first indication information is the 3 rd RNTI, the indication that the network equipment indicates the condition 4 to the terminal equipment is shown, and when the scrambling sequence used by the first indication information is the 4 th RNTI, the indication that the network equipment indicates the condition 5 to the terminal equipment is shown. In this case, the first condition is that the scrambling sequence used by the first instruction information is the 1 st RNTI, the third condition is that the scrambling sequence used by the first instruction information is the 2 nd RNTI, the fourth condition is that the scrambling sequence used by the first instruction information is the 3 rd RNTI, and the fifth condition is that the scrambling sequence used by the first instruction information is the 4 th RNTI. Those skilled in the art will appreciate that there are 24 total cases 1, 3, 4, and 5 numbered, and that the above numbering is only one example of these 24. In the other 23 numbering manners, the manner of the first indication information indication is similar to that of the first indication information indication in the above numbering manner, and is not described herein again.

Taking the method shown in fig. 6 as an example, the network device may indicate one of the cases 1,2,3, 4, and 5 to the terminal device through the first indication information. Alternatively, case 1 is numbered 1, case 2 is numbered 2, case 3 is numbered 3, case 4 is numbered 4, and case 5 is numbered 5. When the scrambling sequence used by the first indication information is the 1 st RNTI, the indication condition 1 of the network equipment to the terminal equipment is shown, when the scrambling sequence used by the first indication information is the 2 nd RNTI, the indication condition 2 of the network equipment to the terminal equipment is shown, when the scrambling sequence used by the first indication information is the 3 rd RNTI, the indication condition 3 of the network equipment to the terminal equipment is shown, when the scrambling sequence used by the first indication information is the 4 th RNTI, the indication condition 4 of the network equipment to the terminal equipment is shown, and when the scrambling sequence used by the first indication information is the 5th RNTI, the indication condition 5 of the network equipment to the terminal equipment is shown. In this case, the first condition is that the scrambling sequence used by the first instruction information is the 1 st RNTI, the second condition is that the scrambling sequence used by the first instruction information is the 2 nd RNTI, the third condition is that the scrambling sequence used by the first instruction information is the 3 rd RNTI, the fourth condition is that the scrambling sequence used by the first instruction information is the 4 th RNTI, and the fifth condition is that the scrambling sequence used by the first instruction information is the 5th RNTI.

Indication mode 2.2: and when the downlink time frequency resource bearing the first indication information is the ith downlink time frequency resource, indicating the condition corresponding to the first indication information indication number i. Where i is used to denote the number of each of these N cases, and the value of i is 1,2,3.

Specifically, the downlink time-frequency resources having N candidates may carry the first indication information, which is: the 1 st downlink time-frequency resource and the 2 nd downlink time-frequency resource … N downlink time-frequency resource. The mapping relationship between the N downlink time-frequency resources and the N candidate conditions may be preset by a protocol, or configured to the terminal device by the network device through RRC signaling or MAC signaling. The network equipment selects one downlink time-frequency resource from the N candidate downlink time-frequency resources to carry the first indication information. Correspondingly, the terminal device tries to receive the first indication information from the network device on one or more downlink time-frequency resources of the N candidate downlink time-frequency resources. And when the terminal equipment receives the first indication information from the network equipment in the ith downlink time-frequency resource, indicating that the network equipment indicates the condition i to the terminal equipment.

Taking the method shown in fig. 3 as an example, the network device may indicate one of the cases 1 and 5 to the terminal device through the first indication information. Alternatively, case 1 is numbered 1 and case 5 is numbered 2. When the time frequency resource bearing the first indication information is the 1 st downlink time frequency resource, indicating that the network device indicates the condition 1 to the terminal device, and when the time frequency resource bearing the first indication information is the 2 nd downlink time frequency resource, indicating that the network device indicates the condition 5 to the terminal device. At this time, the first condition is that the time frequency resource bearing the first indication information is a 1 st downlink time frequency resource, and the fifth condition is that the time frequency resource bearing the first indication information is a 2 nd downlink time frequency resource. Alternatively, case 1 is numbered 2 and case 5 is numbered 1. When the time frequency resource bearing the first indication information is the 1 st downlink time frequency resource, indicating that the network equipment indicates the condition 5 to the terminal equipment, and when the time frequency resource bearing the first indication information is the 2 nd downlink time frequency resource, indicating that the network equipment indicates the condition 1 to the terminal equipment. At this time, the first condition is that the time frequency resource bearing the first indication information is a 2 nd downlink time frequency resource, and the fifth condition is that the time frequency resource bearing the first indication information is a 1 st downlink time frequency resource.

Taking the method shown in fig. 4 as an example, the network device may indicate one of the cases 1, 4, and 5 to the terminal device through the first indication information. Alternatively, case 1 is numbered 1, case 4 is numbered 2, and case 5 is numbered 3. When the time frequency resource bearing the first indication information is the 1 st downlink time frequency resource, indicating that the network device indicates the condition 1 to the terminal device, when the time frequency resource bearing the first indication information is the 2 nd downlink time frequency resource, indicating that the network device indicates the condition 4 to the terminal device, and when the time frequency resource bearing the first indication information is the 3 rd downlink time frequency resource, indicating that the network device indicates the condition 5 to the terminal device. At this time, the first condition is that the time frequency resource bearing the first indication information is a 1 st downlink time frequency resource, the fourth condition is that the time frequency resource bearing the first indication information is a 2 nd downlink time frequency resource, and the fifth condition is that the time frequency resource bearing the first indication information is a 3 rd downlink time frequency resource. Similarly to the indication 2.1, the case 1, case 4 and case 5 are numbered in total 6, and the above-mentioned numbering is just an example of these 6. In the other 5 numbering manners, the manner of the first indication information indication is similar to that of the first indication information indication in the above numbering manner, and is not described herein again.

Taking the method shown in fig. 5 as an example, the network device may indicate one of the cases 1, 3, 4, and 5 to the terminal device through the first indication information. Alternatively, case 1 is numbered 1, case 3 is numbered 2, case 4 is numbered 3, and case 5 is numbered 4. When the time frequency resource bearing the first indication information is the 1 st downlink time frequency resource, indicating that the network equipment indicates the condition 1 to the terminal equipment, when the time frequency resource bearing the first indication information is the 2 nd downlink time frequency resource, indicating that the network equipment indicates the condition 3 to the terminal equipment, when the time frequency resource bearing the first indication information is the 3 rd downlink time frequency resource, indicating that the network equipment indicates the condition 4 to the terminal equipment, and when the time frequency resource bearing the first indication information is the 4 th downlink time frequency resource, indicating that the network equipment indicates the condition 5 to the terminal equipment. At this time, the first condition is that the time frequency resource bearing the first indication information is a 1 st downlink time frequency resource, the third condition is that the time frequency resource bearing the first indication information is a 2 nd downlink time frequency resource, the fourth condition is that the time frequency resource bearing the first indication information is a 3 rd downlink time frequency resource, and the fifth condition is that the time frequency resource bearing the first indication information is a 4 th downlink time frequency resource. Similarly to the indication mode 2.1, the case 1, case 3, case 4, and case 5 are numbered 24 in common, and the above-mentioned numbering is just one example of the 24. In the other 23 numbering manners, the manner of the first indication information indication is similar to that of the first indication information indication in the above numbering manner, and is not described herein again.

Taking the method shown in fig. 6 as an example, the network device may indicate one of the cases 1,2,3, 4, and 5 to the terminal device through the first indication information. Case 1 is numbered 1, case 2 is numbered 2, case 3 is numbered 3, case 4 is numbered 4, and case 5 is numbered 5. When the time frequency resource bearing the first indication information is the 1 st downlink time frequency resource, indicating that the network device indicates the condition 1 to the terminal device, when the time frequency resource bearing the first indication information is the 2 nd downlink time frequency resource, indicating that the network device indicates the condition 2 to the terminal device, when the time frequency resource bearing the first indication information is the 3 rd downlink time frequency resource, indicating that the network device indicates the condition 3 to the terminal device, when the time frequency resource bearing the first indication information is the 4 th downlink time frequency resource, indicating that the network device indicates the condition 4 to the terminal device, when the time frequency resource bearing the first indication information is the 5th downlink time frequency resource, indicating that the network device indicates the condition 5 to the terminal device. At this time, the first condition is that the time frequency resource bearing the first indication information is a 1 st downlink time frequency resource, the second condition is that the time frequency resource bearing the first indication information is a 2 nd downlink time frequency resource, the third condition is that the time frequency resource bearing the first indication information is a 3 rd downlink time frequency resource, the fourth condition is that the time frequency resource bearing the first indication information is a 4 th downlink time frequency resource, and the fifth condition is that the time frequency resource bearing the first indication information is a 5th downlink time frequency resource.

Optionally, in the aboveIndication mode twoThe first indication information may be DCI. Alternatively, the first indication information may be a specific sequence; alternatively, the first indication information may also be a bit (e.g., bit "0" or bit "1"); or, the first indication information only represents one energy value; or the first indication information includes information of time-frequency resources of the second uplink data channel, or the first indication information includes configuration information of the unlicensed resources, or the first indication information includes an index of the random access preamble sequence.

As can be seen from the foregoing, S103a includes operation 1, or S103a includes one or more of operation 2, operation 3, operation 4, and operation 5 in addition to operation 1.

In operation 1, when the network device indicates the case 1 to the device on the terminal through the first indication information, the terminal device sends a random access preamble sequence and second uplink data to the network device. Correspondingly, the network device receives the random access preamble sequence and the second uplink data from the terminal device.

In operation 2, when the network device indicates the case 2 to the device on the terminal through the first indication information, the terminal device transmits a random access preamble sequence to the network device. Correspondingly, the network device receives the random access preamble sequence from the terminal device.

In operation 3, when the network device indicates the condition 3 to the device on the terminal through the first indication information, the terminal device obtains a time-frequency resource of the second uplink data channel, and sends the second uplink data on the time-frequency resource. Correspondingly, the network device receives the second uplink data from the terminal device at the time-frequency resource of the second uplink data channel.

In operation 4, when the network device indicates the condition 4 to the device on the terminal through the first indication information, the terminal device sends the second uplink data to the network device on the license-exempt resource. Correspondingly, the network device receives the second uplink data from the terminal device on the license-free resource.

In operation 5, when the network device indicates the situation 5 to the on-terminal device through the first indication information, the network device has correctly received the first downlink data from the terminal device.

Optionally, when the first indication information satisfies the first condition, the third condition, or the fourth condition, operation 1 or operation 3 or operation 4 may further include: and the terminal equipment receives feedback information of second uplink data sent by the network equipment, and determines one condition indicated by the network equipment for the terminal equipment in the W conditions according to the feedback information of the second uplink data. Where W is a positive integer, which may include, but is not limited to, one or more of case 1, case 2, case 3, case 4, and case 5, above. Optionally, when the network device does not correctly receive the second uplink data, the network device may instruct the terminal device to perform retransmission by using the method described in, but not limited to, any of case 1, case 2, case 3, and case 4, until the number of times that the network device correctly receives or the terminal device retransmits is greater than the threshold value. Optionally, the threshold is preset by a protocol or configured to the terminal device by the network device through a high-level signaling. The threshold value is a positive integer, for example, 3 times.

Optionally, the W cases that the feedback information of the second uplink data may indicate may be the same as the above N cases that the first indication information may indicate. For example, the feedback information of the second uplink data is the same as the first indication information, and after the terminal device receives the feedback information of the second uplink data, the terminal device returns to steps S102 and S103a until the network device receives the feedback information correctly or the number of times of terminal device retransmission is greater than the threshold (as shown by the dashed lines in fig. 3 to fig. 6).

Optionally, the W cases that the feedback information of the second uplink data may indicate include one or more of the above N cases that the first indication information may indicate.

Optionally, when the first indication information satisfies the first condition, the W cases may include one or more of case 1, case 2, case 3, case 4, and case 5, and further include the following cases: the feedback information of the second uplink data may be a random access response (message 2), where the random access response is the same as the first indication information, the random access response indicates that the network device indicates a time-frequency resource to the terminal device through the random access response, and the terminal device sends uplink data to the network device on the time-frequency resource (message 3), where the uplink data includes retransmission data of the first uplink data or the second uplink data. The network device sends feedback information (message 4) for the uplink data to the terminal device, where the feedback information is the same as the first indication information, and after the terminal device receives the feedback information, the terminal device returns to steps S102 and S103a until the network device receives the feedback information correctly or the number of times of terminal device retransmission is greater than a threshold (as shown in fig. 7).

Optionally, when the first indication information satisfies the second condition, operation 2 may further include: the network equipment estimates a new time lead by using a random access leader sequence sent by the terminal equipment; the network equipment performs second demodulation and decoding on the first uplink data by using the new TA and generates feedback information; the network device sends the feedback information to the terminal device and indicates a situation for the terminal device from the W situations by means of the feedback information. Where W is a positive integer, which may include, but is not limited to, one or more of case 1, case 2, case 3, case 4, and case 5, above.

Optionally, when the first indication information satisfies a fifth condition, operation 5 may further include: the terminal device transmits new data based on the unlicensed resource, for example, the terminal device sends the new data to the network device using the unlicensed resource configured for the terminal device by the network device through the parameter in the first RRC message.

Alternatively, the third condition and the fourth condition may be the same. At this time, if the terminal device obtains the time-frequency resource of the second uplink data channel through the first indication information or the second indication information, it indicates that the network device instructs the terminal device to send the second uplink data on the time-frequency resource of the second uplink data channel; and if the terminal equipment does not receive the time-frequency resource indicating the second uplink data channel by the indication information from the network equipment, indicating that the network equipment indicates the terminal equipment to use the authorization-free resource to send the second uplink data.

Alternatively, step S103a may be replaced by the following step S103 b.

S103b, when the first indication information satisfies the second condition, the terminal device sends the random access preamble sequence to the network device. The method can also be described as operation 2: when the first indication information satisfies the second condition, the network device indicates the situation 2 to the terminal device. Case 2 can be described as: the terminal equipment sends a random access preamble sequence to the network equipment.

Alternatively, S103b may include only operation 2. In this possible implementation method, when the first indication information satisfies the second condition, the network device instructs the terminal device to send the random access preamble sequence to the network device. When the terminal equipment does not receive the first indication information; or, when the terminal device does not receive the first indication information in time unit n + k, the terminal device considers that the first uplink data is correctly received by the network device. Wherein n is the number of a time unit for the terminal device to send the first uplink data to the network device, n, k are non-negative integers, and the time unit may be a timeslot, a sub-timeslot, a mini-timeslot, a subframe, or the like.

Alternatively, S103b includes at least one of operation 1, operation 3, operation 4, and operation 5 in S103a, in addition to operation 2: s103b also includes one, two, three, or four of operation 1, operation 2, operation 4, and operation 5 in S103 a.

Similar to S103a, there are 16 possible implementation methods for S103b, and fig. 8 is an example of this implementation method. In each of the 16 possible implementation methods, the network device may indicate one of the N candidate cases to the terminal device through the first indication information. The specific indication manner of the first indication information refers to S103a, which is not described herein again. It is to be understood that the description about the operation 1, the operation 2, the operation 3, the operation 4, and the operation 5 in S103a is equally applicable to S103b, and the description about the first condition, the second condition, the third condition, the fourth condition, and the fifth condition in S103a is equally applicable to S103 b.

The above embodiments provide a method for uplink data transmission. When the network device does not correctly receive the first uplink data from the terminal device, the network device indicates a retransmission mode of the terminal device through the first indication information.

By the method, the reliability of data transmission can be improved. For example, to ensure orthogonality of uplink transmission and avoid intra-cell interference, the network device controls the time when uplink signals from different terminal devices reach the network device by controlling the TA at which each terminal device in a cell transmits an uplink signal.

When the TA changes greatly due to the movement of the terminal device, if the TA is not updated in time by the network device, the network device may not receive the first uplink data correctly. When the network device considers that the first uplink data is not correctly received because the TA is not updated in time, the network device may instruct the terminal device to send a random access preamble sequence (corresponding to operation 2). At this time, the network device estimates a new TA according to the random access preamble sequence, and demodulates and decodes the first uplink data by using the new TA, thereby improving the decoding success rate of the first uplink data and further improving the reliability of data transmission.

When the network device considers that the failure to correctly receive the first uplink data is caused by the fact that the TA is not updated in time and the channel condition is poor, the network device may instruct the terminal device to send the random access preamble sequence and the second uplink data (corresponding to operation 1). At this time, the network device may update the TA through the random access preamble sequence, and may obtain the retransmission combining gain through the second uplink data, thereby improving the decoding success rate of the first uplink data and the second uplink data, and further improving the transmission reliability of the first uplink data.

And when the network equipment considers that the first uplink data cannot be correctly received and the timeliness of the TA is irrelevant, the network equipment instructs the terminal equipment to send the second uplink data on the time-frequency resource of the second uplink data channel. Correspondingly, the terminal device obtains the time-frequency resource of the second uplink data channel, and sends the second uplink data on the time-frequency resource (corresponding to operation 3 and operation 4). The time-frequency resource of the second uplink data channel may be indicated to the terminal device by the network device through the indication information (corresponding to operation 3), or the time-frequency resource of the second uplink data channel may be an unlicensed resource configured for the terminal device by the network device (corresponding to operation 4). In operations 3 and 4, the terminal device does not transmit the random access preamble sequence, thereby improving spectrum efficiency.

By the method provided by the embodiment, the network equipment can flexibly indicate the retransmission mode of the terminal equipment according to the actual situation. In the above mode, the network device judges the effectiveness of the TA and indicates the retransmission mode of the terminal device, so that the terminal device is prevented from autonomously selecting the retransmission mode, the influence on data transmission caused by inaccurate estimation of the TA by the terminal device is avoided, and the reliability of data transmission is improved; meanwhile, in the mode, the network equipment does not need to reserve the authorization-free resource for retransmission and the random access leader sequence for the terminal equipment, and the frequency spectrum efficiency is improved.

Based on the second solution provided by the foregoing description in the embodiment of the present application, fig. 9 is a flowchart illustrating an uplink data transmission method provided by the embodiment of the present application, where the embodiment relates to a specific process for performing uplink data transmission between a network device and a terminal device. As shown in fig. 9, the method may include:

s201, see description of S101 in fig. 2.

S202, see description of S102 in fig. 2.

S203a, when the first indication information satisfies the sixth condition, the terminal device sends the random access preamble sequence and the third uplink data to the network device, and the terminal device receives feedback information of the network device for the third uplink data. The method may also be described as operation 6: when the first indication information satisfies the sixth condition, the network device indicates the situation 6 to the terminal device. Case 6 can be described as: and the terminal equipment sends the random access leader sequence and the third uplink data to the network equipment, and receives the feedback information of the network equipment to the third uplink data. Alternatively, case 6 may also be described as: the terminal device performs random access using the two-step access method, or case 6 can also be described as: the terminal device uses the 2-step RACH or the two-step RACH for random access, which is not limited in the embodiment of the present application. In case 6, the manner for the terminal device to determine the random access preamble sequence is referred to as S103a, which is not described herein again.

In one possible implementation, the third uplink data is different from the first uplink data and the second uplink data. Optionally, the first uplink data is data obtained by the terminal device performing channel coding and rate matching on the first bit sequence, and the third uplink data is data obtained by the terminal device performing channel coding and rate matching on the first bit sequence and RRC message. The channel coding mode of the third uplink data and the channel coding mode of the first uplink data may be the same or different. The RRC message may include one or more of an RRC setup request, an RRC recovery request, an unlicensed resource request, an identification of the terminal device, and a Buffer Status Report (BSR).

Optionally, the third uplink data may be transmitted through a third PUSCH. The random access preamble and the third uplink data in S203a may be collectively referred to as message a. The feedback information of the third uplink data may be referred to as a message B.

Optionally, S203a further includes at least one of the following operations:

operation 3: see description in S103 a;

and operation 4: see description in S103 a;

operation 5: see description in S103 a; and the combination of (a) and (b),

operation 7: when the first indication information satisfies the seventh condition, the network device indicates the situation 7 to the terminal device. Case 7 can be described as: the terminal equipment sends a random access leader sequence (message 1) to the network equipment; the terminal equipment receives a random access response (message 2) from the network equipment, wherein the random access response indicates a first uplink time-frequency resource; the terminal equipment sends fourth uplink data (message 3) on the first uplink time-frequency resource; and the terminal equipment receives the feedback information of the network equipment to the fourth uplink data (message 4). Alternatively, case 7 may also be described as: the terminal device performs random access using the four-step access method, or case 7 can also be described as: the terminal device uses 4-step RACH or four-step RACH for random access, which is not limited in the embodiment of the present application.

In one possible implementation, the fourth uplink data is different from the first uplink data and the second uplink data. Optionally, the fourth uplink data is data and an RRC message obtained by the terminal device performing channel coding and rate matching on the first bit sequence. The channel coding mode of the fourth uplink data and the channel coding mode of the first uplink data may be the same or different. The RRC message may include one or more of an RRC setup request, an RRC recovery request, an unlicensed resource request, an identity of the terminal device, and a BSR.

Alternatively, S203a may include only operation 6. In this possible implementation method, when the first indication information satisfies the sixth condition, the network device indicates the case 6 to the terminal device. When the terminal equipment does not receive the first indication information; or, when the terminal device does not receive the first indication information in time unit n + k, the terminal device considers that the first uplink data is correctly received by the network device. Wherein n is the number of a time unit for the terminal device to send the first uplink data to the network device, n, k are non-negative integers, and the time unit may be a timeslot, a sub-timeslot, a mini-timeslot, a subframe, or the like.

Alternatively, S203a includes at least one of operation 3, operation 4, operation 5, and operation 7 in addition to operation 6: s203a also includes one, two, three, or four of operation 3, operation 4, operation 5, and operation 7.

It is understood that, similar to S103a, there may be 16 possible implementation methods of S203a, and fig. 10 is an example of the 16 possible implementation methods.

The network device may indicate one of the N candidate cases to the terminal device through the first indication information. Referring to S103a in fig. 2, the specific indication manner is that only operation 1 in S103a needs to be replaced by operation 6, and operation 2 needs to be replaced by operation 7, which is not described herein again.

It is understood that the description about operation 3, operation 4, and operation 5 in S103a is equally applicable to S203 a.

In operation 6, when the first indication information satisfies a sixth condition, the network device receives the random access preamble sequence and the third uplink data from the terminal device, and the network device sends feedback information for the third uplink data to the terminal device.

In operation 7, when the first indication information satisfies a seventh condition, the network device receives a random access preamble sequence from the terminal device; the network equipment sends a random access response to the terminal equipment, wherein the random access response indicates a first uplink time-frequency resource; the network equipment receives fourth uplink data from the terminal equipment on the first uplink time-frequency resource; and the network equipment sends the feedback information of the fourth uplink data to the terminal equipment. Specifically, the random access response sent by the network device further includes a TA, where the TA is estimated by the network device according to the random access preamble sequence sent by the terminal device, and the terminal device performs uplink synchronization with the network device by using the TA.

Optionally, when the sixth condition is satisfied by the first indication information, operation 6 may further include: when the network device does not correctly receive the third uplink data, the network device indicates a situation for the terminal device from among the W situations. Where W is a positive integer, which may include, but is not limited to, one or more of case 3, case 4, case 5, case 6, and case 7, described above. The network device may instruct the terminal device to perform retransmission by using the method described in but not limited to any one of the W cases through the first indication information until the network device receives the retransmission correctly or the number of times of retransmission of the terminal device is greater than the threshold value. Optionally, the threshold is preset by a protocol or configured to the terminal device by the network device through a high-level signaling. The threshold value is a positive integer, for example, 3 times. Optionally, after the terminal device receives the feedback information of the third uplink data, the terminal device returns to steps S202 and S203a until the number of times that the network device correctly receives or the terminal device retransmits is greater than the threshold (as shown by the dashed line in fig. 10). Optionally, the W cases include one or more of the N cases described above. Optionally, the network device may also instruct, through the feedback information of the third uplink data, the terminal device to perform retransmission by using the method described in, but not limited to, any one of the W cases, at this time, the terminal device receives the feedback information of the third uplink data, which is equivalent to that the terminal device receives the first instruction information.

Optionally, when the first indication information satisfies the sixth condition, the W cases may further include, in addition to one or more of case 1, case 2, case 3, case 4, and case 5: the feedback information of the third uplink data may be a random access response, the network device indicates a time-frequency resource to the terminal device through the random access response, the terminal device sends uplink data to the network device on the time-frequency resource, and the uplink data may be retransmission data of the third uplink data or the first uplink data.

Optionally, when the first indication information satisfies a seventh condition, operation 7 may further include: when the network device does not correctly receive the fourth uplink data, the network device indicates a condition for the terminal device from among the W conditions. The W cases are similar to the W cases when the first indication information satisfies the sixth condition, and are not described again here. The network device may instruct the terminal device to perform retransmission by using the method described in but not limited to any of the W cases through the first indication information until the network device correctly receives or the number of times of terminal device retransmission is greater than a threshold, where the threshold refers to the above description when the first indication information satisfies the sixth condition. Optionally, after receiving the feedback information of the fourth uplink data, the terminal device returns to steps S202 and S203a until the number of times that the network device receives the feedback information correctly or the terminal device retransmits the feedback information is greater than a threshold (as shown by a dashed line in fig. 11). Optionally, the network device may also instruct, through the feedback information of the fourth uplink data, the terminal device to perform retransmission by using the method described in, but not limited to, any one of the W cases, at this time, the terminal device receives the feedback information of the fourth uplink data, which is equivalent to that the terminal device receives the first instruction information.

Alternatively, step S203a may be replaced by the following step S203 b.

S203b, when the first indication information meets the seventh condition, the terminal device sends a random access preamble sequence to the network device; the terminal equipment receives a random access response from the network equipment, wherein the random access response indicates a first uplink time-frequency resource; the terminal equipment sends fourth uplink data on the first uplink time-frequency resource; and the terminal equipment receives the feedback information of the network equipment to the fourth uplink data. The method can also be described as operation 7: when the first indication information satisfies the seventh condition, the network device indicates the situation 7 to the terminal device. The description of case 7 can be found in S203 a.

Alternatively, S203b may include only operation 7. In this possible implementation method, when the first indication information satisfies the seventh condition, the network device indicates operation 7. When the terminal equipment does not receive the first indication information; or, when the terminal device does not receive the first indication information in time unit n + k, the terminal device considers that the first uplink data is correctly received by the network device. Wherein n is the number of a time unit for the terminal device to send the first uplink data to the network device, n, k are non-negative integers, and the time unit may be a timeslot, a sub-timeslot, a mini-timeslot, a subframe, or the like.

Alternatively, S203b includes at least one of operation 3, operation 4, operation 5, and operation 6 in S203a, in addition to operation 7: s203b also includes one, two, three, or four of operation 3, operation 4, operation 5, and operation 6 in S203 a.

Similar to S203a, S203b may also have 16 possible implementation methods, and fig. 11 is an example of the 16 possible implementation methods. In each of the 16 possible implementation methods, the network device may indicate one of the N candidate cases to the terminal device through the first indication information. For a specific indication manner of the first indication information, refer to S203a, which is not described herein again. It is to be understood that the description about operation 3, operation 4, operation 5, operation 6, and operation 7 in S203a applies equally to S203b, and the description about the third condition, fourth condition, fifth condition, sixth condition, and seventh condition in S203a applies equally to S203 b.

The above embodiments provide a method for uplink data transmission. When the network device does not correctly receive the first uplink data from the terminal device, the network device indicates the terminal device to perform an uplink transmission mode through the first indication information.

For example, when the network device considers that the first uplink data is not correctly received due to uplink desynchronization, the network device instructs, through the first indication information, the terminal device to perform random access by using a two-step access method or a four-step access method, so as to perform uplink transmission with the network device. At this time, the network device may determine the TA according to the random access preamble sequence sent by the terminal device; meanwhile, the terminal device carries third uplink data in the process of random access, and the third uplink data carried in the process can use a modulation coding mode with higher reliability compared with the first uplink data, so that the reliability of data transmission is improved. When the network device considers that the terminal device does not have uplink desynchronization, the network device indicates the terminal device to send the retransmission data of the first uplink data through the first indication information without initiating random access, thereby avoiding the waste of resources.

By the method provided by the embodiment, the network equipment can flexibly indicate the retransmission mode of the terminal equipment according to the actual situation. In the above manner, the network device determines whether the uplink is out of synchronization and instructs the terminal device to perform the data transmission manner, so that the terminal device is prevented from autonomously selecting the data transmission manner, thereby avoiding the influence on the data transmission due to inaccurate estimation of the TA by the terminal device, and improving the reliability of the data transmission; meanwhile, in the mode, the network equipment does not need to reserve the authorization-free resource and the random access resource for retransmission for the terminal equipment, and the frequency spectrum efficiency is improved.

The above embodiments describe the uplink transmission method between the terminal device and the network device, taking as an example when the terminal device is in the RRC _ INACTIVE state. When the terminal device is in the RRC _ CONNECTED state, the network device may send, for example, an RRC release (rrcreelease) message to the terminal device through an RRC release procedure, so that the state of the terminal device is converted from the RRC _ CONNECTED state to an RRC _ INACTIVE state, and when the RRC _ INACTIVE state is reached, the terminal device may perform uplink data transmission with the network device by using the method described in the foregoing embodiment.

It is to be understood that, in order to implement the functions in the above embodiments, the network device and the terminal device include hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and method steps described in connection with the embodiments disclosed herein may be implemented as hardware, software, or combinations of hardware and software. Whether a function is implemented as hardware, software, or computer software drives hardware depends upon the particular application and design constraints imposed on the implementation.

Fig. 12 is a schematic structural diagram of a possible communication device provided in an embodiment of the present application.

In one possible implementation, the apparatus 1200 may be a terminal device, and may implement the terminal device side method in the method embodiment shown in fig. 2 or fig. 9; the apparatus 1200 may also be an apparatus capable of supporting a terminal device to implement the method, and the apparatus 1200 may be installed in the terminal device or used in cooperation with the terminal device.

In another possible implementation, the apparatus 1200 may be a network device, which is capable of implementing the network device side method in the method embodiments shown in fig. 2 or fig. 9; the apparatus 1200 may also be an apparatus capable of supporting a network device to implement the method, and the apparatus 1200 may be installed in the network device or used in cooperation with the network device.

The apparatus 1200 may be a hardware structure, a software module, or a hardware structure plus a software module. The apparatus 1200 may be implemented by a system-on-chip. In the embodiment of the present application, the chip system may be formed by a chip, and may also include a chip and other discrete devices. The apparatus 1200 includes a processing module 1210 and a communication module 1220. The processing module 1210 may generate a signal to be transmitted and may transmit the signal using the communication module 1220. The processing module 1210 may receive a signal using the communication module 1220 and process the received signal. The processing module 1210 and the communication module 1220 are coupled.

The coupling in the embodiments of the present application is an indirect coupling or connection between devices, units or modules, which may be in an electrical, mechanical or other form, and is used for information interaction between the devices, units or modules. The coupling may be a wired connection or a wireless connection.

In this embodiment, the communication module may be a circuit, a module, a bus, an interface, a transceiver, a pin, or other devices that can implement a transceiving function, and this embodiment is not limited in this application.

Fig. 13 is a schematic structural diagram of a possible communication device according to an embodiment of the present application.

In a possible implementation, the apparatus 1300 may be a terminal device, and is capable of implementing the terminal device side method provided in this embodiment of the present application; the apparatus 1300 may also be an apparatus capable of supporting a terminal device to implement the method, such as a chip system, and the apparatus 1300 may be installed in the terminal device or used in cooperation with the terminal device.

In another possible implementation, the apparatus 1300 may be a network device, and is capable of implementing the network-side method provided in this embodiment of the present application; the apparatus 1300 may also be an apparatus, such as a chip system, capable of supporting a network device to implement the method, and the apparatus 1300 may be installed in or used with the network device.

As shown in fig. 13, the communications device 1300 includes a processor 1310 and an interface circuit 1320. The processor 1310 and the interface circuit 1320 are coupled to each other. It is to be appreciated that the interface circuit 1320 may be a transceiver or an input-output interface. Optionally, the communications apparatus 1300 may also include a memory 1330 for storing instructions that can be executed by the processor 1310, for storing input data required by the processor 1310 to execute the instructions, and/or for storing data generated by the processor 1310 after executing the instructions.

When the communication device 1300 is used to implement the method shown in fig. 2 or fig. 9, the processor 1310 is configured to perform the functions of the processing module 1210, and the interface circuit 1320 is configured to perform the functions of the communication module 1220.

When the communication device is a chip applied to a terminal device, the terminal device chip implements the functions of the terminal device in the above method embodiment. The terminal device chip receives information from other modules (such as a radio frequency module or an antenna) in the terminal device, wherein the information is sent to the terminal device by the network device; or, the terminal device chip sends information to other modules (such as a radio frequency module or an antenna) in the terminal device, where the information is sent by the terminal device to the network device.

When the communication device is a chip applied to a network device, the network device chip implements the functions of the network device in the above method embodiments. The network device chip receives information from other modules (such as a radio frequency module or an antenna) in the network device, wherein the information is sent to the network device by the terminal device; alternatively, the network device chip sends information to other modules (such as a radio frequency module or an antenna) in the network device, and the information is sent by the network device to the terminal device.

It is understood that the Processor in the embodiments of the present Application may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The general purpose processor may be a microprocessor, but may be any conventional processor.

In embodiments of the present application, the processor may be a Random Access Memory (RAM), a flash Memory, a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable Programmable PROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), a register, a hard disk, a removable hard disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a network device or a terminal device. Of course, the processor and the storage medium may reside as discrete components in a network device or a terminal device.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a terminal device, or other programmable apparatus. The computer program or instructions may be stored in or transmitted over a computer-readable storage medium. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server that integrates one or more available media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; or an optical medium, such as a DVD; it may also be a semiconductor medium, such as a Solid State Disk (SSD).

In the embodiments of the present application, unless otherwise specified or conflicting with respect to logic, the terms and/or descriptions in different embodiments have consistency and may be mutually cited, and technical features in different embodiments may be combined to form a new embodiment according to their inherent logic relationship.

It is to be understood that the various numerical references referred to in the embodiments of the present application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of the present application. The sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of the processes should be determined by their functions and inherent logic.

Claims

A method for uplink data transmission, the method comprising:

sending first uplink data to network equipment;

receiving first indication information from the network equipment, wherein the first indication information indicates feedback information of the first uplink data;

and when the first indication information meets a first condition, sending a random access preamble and second uplink data to the network equipment, wherein the second uplink data is retransmission data of the first uplink data.
The method of claim 1, wherein the sending the first uplink data to the network device comprises:

and sending first uplink data to the network equipment through a first uplink data channel, wherein the time-frequency resource of the first uplink data channel is indicated by a first Radio Resource Control (RRC) message.
The method according to claim 1 or 2, characterized in that the method further comprises:

and determining the time-frequency resource of a second uplink data channel according to the random access preamble and the mapping relation between the time-frequency resources of the random access preamble and the uplink data channel, wherein the second uplink data channel bears the second uplink data.
The method according to any one of claims 1 to 3, further comprising:

and when the first indication information meets a second condition, sending the random access preamble to the network equipment.
A method for uplink data transmission, the method comprising:

sending first uplink data to network equipment;

receiving first indication information from the network equipment, wherein the first indication information indicates feedback information of the first uplink data;

and when the first indication information meets a second condition, sending a random access preamble to the network equipment.
The method of claim 5, wherein the sending the first uplink data to the network device comprises:

and sending first uplink data to the network equipment through a first uplink data channel, wherein the time-frequency resource of the first uplink data channel is indicated through a first RRC message.
The method according to any one of claims 1 to 6,

the first indication information further indicates an index of the random access preamble.
The method according to any one of claims 1 to 7, further comprising:

and when the first indication information meets a third condition, sending second uplink data to the network equipment through a second uplink data channel, wherein the time-frequency resource of the second uplink data channel is indicated by the first indication information.
The method according to any one of claims 1 to 8, further comprising:

and when the first indication information meets a fourth condition, sending second uplink data to the network equipment through a second uplink data channel, wherein the time-frequency resource of the second uplink data channel is indicated through a first RRC message.
A method for uplink data transmission, characterized in that,

receiving first uplink data from terminal equipment;

sending first indication information to the terminal equipment, wherein the first indication information indicates feedback information of the first uplink data;

and when the first indication information meets a first condition, receiving a random access preamble and second uplink data from the terminal equipment, wherein the second uplink data is retransmission data of the first uplink data.
The method of claim 10, wherein the receiving the first uplink data from the terminal device comprises:

receiving first uplink data from a terminal device through a first uplink data channel, wherein a time-frequency resource of the first uplink data channel is indicated through a first RRC message.
The method according to claim 10 or 11, characterized in that the method further comprises:

and determining the time-frequency resource of the second uplink data channel according to the random access preamble and the mapping relation between the time-frequency resources of the random access preamble and the uplink data channel, wherein the second uplink data channel bears the second uplink data.
The method according to any one of claims 10 to 12, further comprising:

receiving the random access preamble from the terminal device when the first indication information satisfies a second condition.
A method for uplink data transmission, characterized in that,

receiving first uplink data from terminal equipment;

sending first indication information to the terminal equipment, wherein the first indication information indicates feedback information of the first uplink data;

and when the first indication information meets a second condition, receiving a random access preamble from the terminal equipment.
The method of claim 14, wherein the receiving the first uplink data from the terminal device comprises:

receiving first uplink data from a terminal device through a first uplink data channel, wherein a time-frequency resource of the first uplink data channel is indicated through a first RRC message.
The method according to any one of claims 10 to 15,

the first indication information further indicates an index of the random access preamble.
The method according to any one of claims 10 to 16, further comprising:

and when the first indication information meets a third condition, receiving second uplink data from the terminal equipment through a second uplink data channel, wherein the time-frequency resource of the second uplink data channel is indicated by the first indication information.
The method according to any one of claims 10 to 17, further comprising:

and when the first indication information meets a fourth condition, receiving second uplink data from the terminal equipment through a second uplink data channel, wherein the time-frequency resource of the second uplink data channel is indicated through a first RRC message.
A method for uplink data transmission, characterized in that,

sending first uplink data to network equipment;

receiving first indication information from the network equipment, wherein the first indication information indicates feedback information of the first uplink data;

when the first indication information satisfies a sixth condition:

sending a random access preamble and third uplink data to the network equipment;

receiving feedback information of the third uplink data from the network device.
The method according to claim 19, wherein when the first indication information satisfies a seventh condition, the method further comprises:

sending a random access preamble to the network device;

receiving a random access response from the network device, the random access response indicating a first uplink time-frequency resource;

sending fourth uplink data to the network equipment on the first uplink time-frequency resource;

receiving feedback information of the fourth uplink data from the network device.
A method for uplink data transmission, characterized in that,

sending first uplink data to network equipment;

receiving first indication information from the network equipment, wherein the first indication information indicates feedback information of the first uplink data;

when the first indication information satisfies a seventh condition:

sending a random access preamble to the network device;

receiving a random access response from the network device, the random access response indicating a first uplink time-frequency resource;

sending fourth uplink data to the network equipment on the first uplink time-frequency resource;

and receiving feedback information of the fourth uplink data from the network equipment.
The method according to any of claims 19 to 21, wherein said sending first uplink data to a network device comprises:

and sending first uplink data to the network equipment through a first uplink data channel, wherein the time-frequency resource of the first uplink data channel is indicated through a first RRC message.
A method for uplink data transmission, characterized in that,

receiving first uplink data from terminal equipment;

sending first indication information to the terminal equipment, wherein the first indication information indicates feedback information of the first uplink data;

when the first indication information satisfies a sixth condition:

receiving a random access preamble and third uplink data from the terminal device;

and sending feedback information of the third uplink data to the terminal equipment.
The method according to claim 23, wherein when the first indication information satisfies a seventh condition, the method further comprises:

receiving a random access preamble from the terminal device;

sending a random access response to the terminal equipment, wherein the random access response indicates a first uplink time-frequency resource;

receiving fourth uplink data from the terminal equipment on the first uplink time-frequency resource;

and sending feedback information of the fourth uplink data to the terminal equipment.
A method for uplink data transmission, characterized in that,

receiving first uplink data from terminal equipment;

sending first indication information to the terminal equipment, wherein the first indication information indicates feedback information of the first uplink data;

when the first indication information satisfies a seventh condition:

receiving a random access preamble from the terminal device;

sending a random access response to the terminal equipment, wherein the random access response indicates a first uplink time-frequency resource;

receiving fourth uplink data from the terminal equipment on the first uplink time-frequency resource;

and sending feedback information of the fourth uplink data to the terminal equipment.
The method according to any one of claims 23 to 25, wherein the receiving the first uplink data from the terminal device comprises:

receiving first uplink data from a terminal device through a first uplink data channel, wherein a time-frequency resource of the first uplink data channel is indicated through a first RRC message.
A communications device arranged to perform the method of any of claims 1 to 9, or 19 to 22.
A communications device arranged to perform the method of any of claims 10 to 18, or 23 to 26.
A communications apparatus comprising a processor and a memory, the processor and the memory coupled, the processor configured to implement the method of any of claims 1 to 9, or 19 to 22.
A communications apparatus comprising a processor and a memory, the processor and the memory coupled, the processor configured to implement the method of any of claims 10 to 18, or 23 to 26.
A communications apparatus, comprising: a processor and an interface circuit, and a memory,

the processor sends first uplink data to the network equipment by using the interface circuit;

the processor receives first indication information from the network equipment by using the interface circuit, wherein the first indication information indicates feedback information of the first uplink data;

when the first indication information meets a first condition, the processor sends a random access preamble and second uplink data to the network device by using the interface circuit, wherein the second uplink data is retransmission data of the first uplink data.
A communications apparatus, comprising: a processor and an interface circuit, and a memory,

the processor sends first uplink data to the network equipment by using the interface circuit;

the processor receives first indication information from the network equipment by using the interface circuit, wherein the first indication information indicates feedback information of the first uplink data;

when the first indication information meets a second condition, the processor sends a random access preamble to the network device by using the interface circuit.
A communications apparatus, comprising: a processor and an interface circuit, and a memory,

the processor sends first uplink data to the network equipment by using the interface circuit;

the processor receives first indication information from the network equipment by using the interface circuit, wherein the first indication information indicates feedback information of the first uplink data;

when the first indication information satisfies a sixth condition:

the processor sends a random access preamble and third uplink data to the network device by using the interface circuit;

the processor receives feedback information of the third uplink data from the network device using the interface circuit.
A communications apparatus, comprising: a processor and an interface circuit, and a memory,

the processor sends first uplink data to the network equipment by using the interface circuit;

the processor receives first indication information from the network equipment by using the interface circuit, wherein the first indication information indicates feedback information of the first uplink data;

when the first indication information satisfies a seventh condition:

the processor sends a random access preamble to the network device using the interface circuit;

the processor receives a random access response from the network device using the interface circuit, the random access response indicating a first uplink time-frequency resource;

the processor transmits fourth uplink data to the network device on the first uplink time-frequency resource by using the interface circuit;

the processor receives feedback information of the fourth uplink data from the network device by using the interface circuit.
A communications apparatus, comprising: a processor and an interface circuit, and a memory,

the processor receives first uplink data from the terminal equipment by using the interface circuit;

the processor sends first indication information to the terminal equipment by using the interface circuit, wherein the first indication information indicates feedback information of the first uplink data;

when the first indication information meets a first condition, the processor receives a random access preamble and second uplink data from the terminal device by using the interface circuit, where the second uplink data is retransmission data of the first uplink data.
A communications apparatus, comprising: a processor and an interface circuit, and a memory,

the processor receives first uplink data from the terminal equipment by using the interface circuit;

the processor sends first indication information to the terminal equipment by using the interface circuit, wherein the first indication information indicates feedback information of the first uplink data;

when the first indication information meets a second condition, the processor receives a random access preamble from the terminal device by using the interface circuit.
A communications apparatus, comprising: a processor and an interface circuit, and a memory,

the processor receives first uplink data from the terminal equipment by using the interface circuit;

the processor sends first indication information to the terminal equipment by using the interface circuit, wherein the first indication information indicates feedback information of the first uplink data;

when the first indication information satisfies a sixth condition:

the processor receives a random access preamble and third uplink data from the terminal device by using the interface circuit;

and the processor sends feedback information of the third uplink data to the terminal equipment by using the interface circuit.
A communications apparatus, comprising: a processor and an interface circuit, and a memory,

the processor receives first uplink data from the terminal equipment by using the interface circuit;

the processor sends first indication information to the terminal equipment by using the interface circuit, wherein the first indication information indicates feedback information of the first uplink data;

when the first indication information satisfies a seventh condition:

the processor receives a random access preamble from the terminal device using the interface circuit;

the processor sends a random access response to the terminal equipment by using the interface circuit, wherein the random access response indicates a first uplink time-frequency resource;

the processor receives fourth uplink data from the terminal equipment on the first uplink time-frequency resource by using the interface circuit;

and the processor sends feedback information of the fourth uplink data to the terminal equipment by using the interface circuit.
A computer-readable storage medium, in which a computer program or instructions are stored which, when executed by a computer, implement the method of any one of claims 1 to 9, or 10 to 18, or 19 to 22, or 23 to 26.
A computer program product comprising instructions which, when executed by a computer, implement the method of any one of claims 1 to 9, or 10 to 18, or 19 to 22, or 23 to 26.
A communication system comprising a communication device as claimed in any of claims 27, 29, 31 to 34 and a communication device as claimed in any of claims 28, 30, 35 to 38.