WO2020030139A1 - Communication method and apparatus - Google Patents

Abstract

The embodiments of the present application provide a communication method and apparatus. Said method comprises: a network device sending DCI to a terminal device, said DCI being used to indicate retransmission of a message 3 in a random access process, and said DCI comprising a first indication; the value of the first indication, when falling within a first value range, being used to indicate that the retransmitted message 3 is different from the message 3 that has been transmitted by the terminal device in the random access process, and the scheduling delay of the retransmitted message 3 being a first delay; the value of the first indication, when falling within a second value range, being used to indicate that the retransmitted message 3 is the same as the message 3 that has been transmitted by the terminal device in the random access process, and the scheduling delay of the retransmitted message 3 being a second delay; the first delay being greater than the second delay; and the network device receiving the message 3 retransmitted by the terminal device.

Description

Communication method and device

Cross-reference to related applications

This application claims priority from a Chinese patent application filed with the Chinese Patent Office on August 10, 2018 with an application number of 201810910253.0 and an application name of "a communication method and device", the entire contents of which are incorporated herein by reference.

Technical field

The present application relates to the field of communication technologies, and in particular, to a communication method and device.

Background technique

The Internet of Things (IoT) refers to the "Internet of Things", which can extend the user end of the Internet to any item. Such a communication method is also called machine type communication (MTC). Typical IoT applications include smart grids, smart agriculture, smart transportation, smart homes, and environmental detection. Many application scenarios of the Internet of Things are services that report small data packets, such as reporting the status of water meters, electricity meters, and natural gas meters. To complete the transmission of such small data packet services, if a radio resource control (RRC) connection is established through a random access (RA) process, then data transmission and other processes are performed, and signaling overhead is timely. The delay is large, and the power consumption of the terminal device is large.

In order to save signaling overhead, reduce delay, and power consumption of terminal equipment, the early data transmission (EDT) mechanism is currently introduced in the random access process: that is, these small packets of data are completed during the random access process. Transmission can reduce signaling overhead, delay, and power consumption of terminal equipment.

When the EDT mechanism is used in the random access process, due to various reasons, the base station may not receive the message including the service data sent by the terminal device. At this time, the base station may instruct the terminal device to respond through downlink control information (DCI). Back to the traditional random access process, that is, the terminal device does not send a message including EDT during the random access process, but sends a message not including EDT to complete the random access process.

At present, when the base station instructs the terminal device to fall back to the traditional random access process, the terminal device does not have enough time to reconstruct the message that does not include EDT, so that the terminal device cannot complete random access.

Summary of the invention

The embodiments of the present application provide a communication method and device, which are used to solve the problem of how a base station instructs a terminal device to complete random access during a random access process.

In a first aspect, an embodiment of the present application provides a communication method. The method includes:

The network device sends downlink control information DCI to the terminal device, where the DCI is used to instruct retransmission of message 3 in the random access process, and the DCI includes a first indication; the network device receives the resend by the terminal device. Message 3. The value of the first indication is used to indicate that the value of the first indication is within the range of the first value. The retransmitted message 3 is different from the message 3 that the terminal device has sent during the random access process, and The scheduling delay of the retransmitted message 3 is the first delay; the value of the first indication is used for indication within the range of the second value, and the retransmitted message 3 is in the same range as the terminal device. The message 3 sent in the random access process is the same, and the scheduling delay of the resent message 3 is a second delay; wherein the first delay is greater than the second delay, and the resending The scheduling delay of the sent message 3 is the delay between the physical uplink shared channel PUSCH carrying the resent message 3 and the DCI.

Through the above method, the network device instructs the terminal device to resend message 3 that is the same as or different from the sent message 3, and instructs the terminal device to use different scheduling delays for different situations, so that when resending message 3 Different from the sent message 3, the terminal device has enough time to regenerate the message 3, so that the random access process can be completed, and when the resent message 3 is the same as the sent message 3, the terminal device can Message 3 is resent within a short time, so that the random access process can be completed in a short time. Specifically, the network device indicates, through the value range of the first indication, that the resent message 3 is different from the message 3 that the terminal device has sent during the random access process. The scheduling delay of the message 3 is the first delay, so that the terminal device has enough time to reconstruct and include the message 3, thereby completing random access. When the network device indicates, through the first indicated value range, that the retransmitted message 3 is the same as the message 3 that the terminal device has sent during the random access process, the scheduling of the message 3 that the terminal device resends is scheduled. The time delay is the second time delay, so that the terminal device does not need to wait for too long to resend the message 3, and reduces the time delay of random access by the terminal device.

In a possible design, before the network device sends the downlink control information DCI to the terminal device, the method further includes:

The network device shown instructs the terminal device to send a message 3 including user data during the random access process.

In a possible design, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

The resent message 3 does not include user data, and the sent message 3 includes user data.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 2, and the second value range is greater than or equal to 3 and less than or equal to 15.

In a possible design, the second delay is 8 ms; the first delay is 12 ms.

With the above method, the first delay is 12 ms. When the terminal device resends message 3 including user data, and it is different from the message 3 sent in the random access process before the terminal device receives DCI, the terminal device has sufficient Time to reconstruct message 3 including user data to complete random access. The second delay is 8ms. When message 3 resent by the terminal device does not include user data and is the same as message 3 sent in the random access process before the terminal device receives DCI, the terminal device does not need to wait too long. Time to resend message 3 to reduce the delay of random access of terminal equipment.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 7, and the second value range is greater than or equal to 8 and less than or equal to 15.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 3, and the second value range is greater than or equal to 4 and less than or equal to 15.

In a possible design, the second delay is 4ms; the first delay is 12ms.

With the above method, the first delay is 12 ms. When the terminal device resends message 3 including user data, and it is different from the message 3 sent in the random access process before the terminal device receives DCI, the terminal device has sufficient Time to reconstruct message 3 including user data to complete random access. The second delay is 4ms. When message 3 resent by the terminal device does not include user data, and it is the same as message 3 sent in the random access process before the terminal device receives DCI, it enables the terminal device to wait for too long. Resend message 3 for a long time to reduce the delay of random access of terminal equipment.

In a second aspect, an embodiment of the present application provides a communication device, where the communication device includes a processor, and the processor is coupled to a memory, where: the memory is used to store instructions; the processor is used to execute the instructions stored in the memory to execute The first aspect or the method in any of the possible designs of the first aspect. Optionally, the communication device may further include the memory. Optionally, the communication device may further include a transceiver for supporting the communication device to perform information transmission and / or reception in the foregoing method. Optionally, the communication device may be a network device or a device in the network device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and / or Discrete devices.

According to a third aspect, an embodiment of the present application provides a communication apparatus for implementing the foregoing first aspect or any one of the methods in the first aspect, including corresponding function modules, such as a processing unit, a transceiver unit, and the like, which are respectively used for Implement the steps in the above method.

In a fourth aspect, an embodiment of the present application provides a communication method, including:

The terminal device receives the downlink control information DCI sent by the network device, and the DCI is used to instruct the terminal device to resend message 3 in the random access process, and the DCI includes a first instruction; the terminal device according to the first instruction Determining a scheduling delay for the message 3 retransmitted by the terminal device; wherein the value of the first indication is within a first value range, and the retransmitted message 3 and the terminal device are received at the random connection The sent message 3 during the incoming process is different, and the scheduling delay of the resent message 3 is the first delay; the value of the first indication is within the second value range, and the resent message The message 3 is the same as the message 3 that the terminal device has sent during the random access process, and the scheduling delay of the resent message 3 is a second delay; wherein the first delay is greater than the The second delay; the scheduling delay of the retransmitted message 3 is the delay between the physical uplink shared channel PUSCH carrying the retransmitted message 3 and the DCI.

By using the foregoing method, the terminal device determines, through the value range of the first indication, that the resent message 3 is different from the message 3 that the terminal device has sent during the random access process. The scheduling delay of the message 3 is the first delay, so that the terminal device has enough time to reconstruct and include the message 3, thereby completing random access. When the terminal device determines, through the value range of the first indication, that the retransmitted message 3 is the same as the message 3 that the terminal device has sent during the random access process, the scheduling time of the message 3 that the terminal device resends is scheduled. The delay is a second delay, so that the terminal device does not need to wait too long to resend the message 3, and reduces the delay of random access by the terminal device.

In a possible design, before the terminal device receives the downlink control information DCI sent by the network device, the method further includes: sending, by the terminal device to the network device during the random access process, a user including the user. Data message 3.

Through the above method, before sending the DCI to instruct the terminal device to send message 3, which is different from the message 3 sent by the terminal device, the first delay indicated by the first instruction is greater than the second delay, so that the terminal device has sufficient time to restart The construction includes message 3 to complete random access. Before sending the DCI, instruct the terminal device to send message 3. When the message 3 sent by the terminal device is the same, the second instruction indicates a small second delay. The terminal device does not need to wait too long to resend message 3, which reduces the terminal. Delay in random access of devices.

In a possible design, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

The resent message 3 does not include user data, and the sent message 3 includes user data.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 2, and the second value range is greater than or equal to 3 and less than or equal to 15.

In a possible design, the second delay is 8 ms; the first delay is 12 ms.

With the above method, the first delay is 12 ms. When the terminal device resends message 3 including user data, and it is different from the message 3 sent in the random access process before the terminal device receives DCI, the terminal device has sufficient Time to reconstruct message 3 including user data to complete random access. The second delay is 8ms. When message 3 resent by the terminal device does not include user data, and is the same as message 3 sent in the random access process before the terminal device receives DCI, it enables the terminal device to wait for too long. Resend message 3 for a long time to reduce the delay of random access of terminal equipment.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 7, and the second value range is greater than or equal to 8 and less than or equal to 15.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 3, and the second value range is greater than or equal to 4 and less than or equal to 15.

In a possible design, the second delay is 4ms; the first delay is 12ms.

With the above method, the first delay is 12 ms. When the terminal device resends message 3 including user data, and it is different from the message 3 sent in the random access process before the terminal device receives DCI, the terminal device has sufficient Time to reconstruct message 3 including user data to complete random access. The second delay is 4ms. When message 3 resent by the terminal device does not include user data, and it is the same as message 3 sent in the random access process before the terminal device receives DCI, it enables the terminal device to wait for too long. Resend message 3 for a long time to reduce the delay of random access of terminal equipment.

According to a fifth aspect, an embodiment of the present application provides a communication device. The communication device includes a processor, and the processor is coupled to a memory, where the memory is used to store instructions; the processor is configured to execute the instructions stored in the memory and configured to: The method in the fourth aspect or any of the possible designs of the fourth aspect is performed. Optionally, the communication device may further include the memory. Optionally, the communication device may further include a transceiver for supporting the communication device to perform information transmission and / or reception in the foregoing method. Optionally, the communication device may be a terminal device or a device in the terminal device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and / or Discrete devices.

According to a sixth aspect, an embodiment of the present application provides a communication device, which is used to implement the fourth aspect or any one of the methods in the fourth aspect, and includes a corresponding functional module, such as a processing unit, a transceiver unit, and the like, which are respectively used for Implement the steps in the above method.

In a seventh aspect, an embodiment of the present application provides a communication method, including:

The network device sends downlink control information DCI to the terminal device, where the DCI is used to instruct retransmission of message 3 in the random access process, and the DCI includes a first indication; if the first indication is within a first value range And the network device terminates the random access, wherein the value of the first indication is used for indication within a first value range, and the retransmitted message 3 and the terminal device are in the random The message 3 sent during the access process is different.

Through the above method, when the first indication is within the first value range, the network device can determine that the message 3 resent by the terminal device is different from the message 3 that the terminal device has sent during the random access process, and it is determined that the terminal device cannot Complete random access to terminate random access in advance and improve system efficiency.

In a possible design, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

The resent message 3 does not include user data, and the sent message 3 includes user data.

In a possible design, the network device terminating the random access includes:

The network device no longer monitors whether the terminal device resends message 3.

In a possible design, the DCI further includes a second indication;

If the first indication is within a first value range, the network device terminates the random access, including:

If the first indication is within a first value range and the scheduling delay indicated by the second indication is less than or equal to a preset delay, the network device terminates the random access.

With the above method, when the first instruction is within the first value range and the scheduling delay indicated by the second instruction is less than or equal to a preset delay, the network device can determine that the terminal device cannot complete within the scheduling delay Random access, which terminates random access in advance and improves system efficiency.

In a possible design, the preset delay is 8 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 2.

In a possible design, the preset delay is 4 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 3, or the first value range is greater than or equal to 0 and less than or equal to 7.

In a possible design, before the network device sends the downlink control information DCI to the terminal device, the method further includes:

The network device shown instructs the terminal device to send a message 3 including user data.

In a possible design, when the first indication is within the first value range, the resending message 3 indicated by the first indication does not include user data; the first indication is in the first When the value is within the range of two, the first indication indicates that the retransmitted message 3 includes user data.

According to an eighth aspect, an embodiment of the present application provides a communication device, where the communication device includes a processor, and the processor is coupled to a memory, where the memory is configured to store instructions; the processor is configured to execute the instructions stored in the memory and configured to: Implement the method in the seventh aspect or any one of the possible designs of the seventh aspect. Optionally, the communication device may further include the memory. Optionally, the communication device may further include a transceiver for supporting the communication device to perform information transmission and / or reception in the foregoing method. Optionally, the communication device may be a terminal device or a device in the terminal device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and / or Discrete devices.

In a ninth aspect, an embodiment of the present application provides a communication device for implementing the seventh aspect or any one of the seventh aspects, including corresponding function modules, such as a processing unit, a transceiver unit, and the like, which are respectively used for Implement the steps in the above method.

In a tenth aspect, an embodiment of the present application provides a communication method, including:

The terminal device receives downlink control information DCI sent by the network device during the random access process, where the DCI includes a first indication; the DCI is used to instruct the terminal device to resend message 3 during the random access process; if The first indication is within the first value range, and the terminal device terminates the random access, wherein the value of the first indication is within the first value range, and the resent message 3 It is different from the message 3 that the terminal device has sent during the random access process.

With the above method, when the first indication is within the first value range, the terminal device can determine that random access cannot be completed, thereby terminating the random access in advance and improving system efficiency.

In a possible design, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

The resent message 3 does not include user data, and the sent message 3 includes user data.

In a possible design, the DCI further includes a second indication;

If the first indication is within a first value range, the terminal device terminates the random access, including:

If the first indication is within a first value range and the scheduling delay indicated by the second indication is less than or equal to a preset delay, the terminal device terminates the random access.

With the above method, when the first instruction is within the first value range and the scheduling delay indicated by the second instruction is less than or equal to a preset delay, the terminal device may determine that random access cannot be completed within the scheduling delay. In order to terminate random access in advance and improve system efficiency.

In a possible design, the preset delay is 8 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 2.

In a possible design, the preset delay is 4 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 3, or the first value range is greater than or equal to 0 and less than or equal to 7.

In a possible design, the terminal device terminating the random access includes:

The terminal device stops the contention resolution timer of the random access.

In a possible design, the terminal device terminating the random access includes:

The terminal device keeps counting of the random access contention resolution timer, and waits for the contention resolution timer to time out.

In a possible design, before the terminal device receives the downlink control information DCI sent by the network device, the method further includes:

The terminal device sends a message 3 including user data to the network device during the random access process.

Through the above method, the first indication can be used to determine the message 3 instructed by the terminal device to be sent before DCI is sent. When the message 3 is different from the message sent by the terminal device, the network device can determine that the terminal device cannot complete random access within the scheduling delay So as to terminate random access in advance and improve system efficiency.

In a possible design, when the first indication is within the first value range, the resent message 3 indicated by the first indication does not include user data;

Alternatively, when the first indication is within a second value range, the retransmitted message 3 indicated by the first indication includes user data.

According to an eleventh aspect, an embodiment of the present application provides a communication device, where the communication device includes a processor, and the processor is coupled to a memory, where: the memory is used to store instructions; the processor is used to execute the instructions stored in the memory by using In implementing the tenth aspect or any of the possible designs of the tenth aspect. Optionally, the communication device may further include the memory. Optionally, the communication device may further include a transceiver for supporting the communication device to perform information transmission and / or reception in the foregoing method. Optionally, the communication device may be a terminal device or a device in the terminal device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and / or Discrete devices.

In a twelfth aspect, an embodiment of the present application provides a communication device for implementing the tenth aspect or any one of the tenth aspects, including a corresponding functional module, such as a processing unit, a transceiver unit, and the like, respectively. For implementing the steps in the above method.

In a thirteenth aspect, an embodiment of the present application provides a computer-readable storage medium, where the computer-readable instructions are stored in the computer storage medium, and when the computer reads and executes the computer-readable instructions, the computer is caused to execute any of the foregoing tasks. Method in one or any of the possible designs of any aspect.

In a fourteenth aspect, an embodiment of the present application provides a computer program product. When the computer reads and executes the computer program product, the computer is caused to execute a method in any one of the foregoing aspects or any one of the possible designs. .

In a fifteenth aspect, an embodiment of the present application provides a chip that is connected to a memory and is configured to read and execute a software program stored in the memory to implement any one of the foregoing aspects or any of the aspects. Possible design methods.

In a sixteenth aspect, an embodiment of the present application provides a communication device, including a processor, which is configured to be coupled to a memory, and read and execute instructions in the memory to implement any of the foregoing aspects or any of the aspects Any possible design method.

In a seventeenth aspect, an embodiment of the present application provides a communication system including the communication device in the second aspect and the communication device in the fifth aspect, or the communication device in the eighth aspect and the communication device in the eleventh aspect. .

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of a communication system applicable to a communication method according to an embodiment of the present application;

2 is a schematic diagram of a random access process according to an embodiment of the present application;

3 is a schematic flowchart of a communication method according to an embodiment of the present application;

4 is a schematic diagram of a scheduling delay according to an embodiment of the present application;

5 is a schematic flowchart of a communication method according to an embodiment of the present application;

6 is a schematic structural diagram of a communication device according to an embodiment of the present application;

7 is a schematic structural diagram of a communication device according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application.

detailed description

The embodiments of the present application are described in detail below with reference to the accompanying drawings.

The embodiments of the present application can be applied to a wireless communication system, and particularly applicable to a mobile communication system supporting NB-IoT or eMTC, such as: a new wireless (NR) system, a long term evolution (LTE) system, and an advanced Other communication systems, such as an advanced long term evolution (LTE-A) system, an evolved long term evolution (eLTE) system, and a future communication system, are not specifically limited here.

In order to facilitate understanding of the embodiments of the present application, a communication system shown in FIG. 1 is taken as an example to describe in detail a communication system applicable to the embodiments of the present application. FIG. 1 is a schematic diagram of a communication system applicable to a communication method according to an embodiment of the present application. As shown in FIG. 1, the base station and the terminal devices 1 to 6 form a communication system. In the communication system, the base station sends information to one or more of the terminal devices 1 to 6. In addition, the terminal devices 4 to 6 also constitute a communication system, in which the terminal device 5 can send information to one or more of the terminal device 4 and the terminal device 6.

Specifically, the terminal device in the embodiment of the present application is to provide a user with voice and / or data connectivity, a device with a wireless transceiver function or a chip or a chip system that can be set on the device, wherein the chip system includes at least one chip , Can also contain other circuit structures or discrete devices. The terminal device can communicate with one or more core networks via a radio access network (RAN). The terminal device can be a mobile phone, a tablet, a computer with a wireless transceiver function, a personal digital assistant (PDA), a virtual reality (VR) terminal, or augmented reality (AR) terminal, wireless terminal in industrial control, wireless terminal in self driving, wireless terminal in remote medical, wireless terminal in smart grid, Wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and the like. The embodiment of the present application does not limit the application scenario. In the present application, the foregoing terminal device and chips that can be disposed in the foregoing terminal device are collectively referred to as a terminal device. The terminal equipment in the embodiments of the present application may also be referred to as user equipment (UE), user terminal (user terminal), access terminal (access terminal), user unit, user station, mobile station (mobile station), A mobile station, a remote station, a remote terminal, a mobile device, a wireless communication device, a user agent, or a user device.

A network device is a device with a wireless transceiver function or a chip that can be set on the device. The network device can be used to convert the received air frames and IP packets to each other as a terminal device and the rest of the access network. The router can also be used to coordinate the management of the attributes of the air interface. The equipment includes, but is not limited to, satellites, gateways, evolved Node B (eNB), radio network controller (RNC), node B (Node B, NB), and base station controller ( base station controller (BSC), base transceiver station (BTS), home base station (e.g., home NodeB, or home Node B, HNB), baseband unit (BBU), wireless fidelity , WIFI) access point (access point, AP), wireless relay node, wireless return node, transmission point (TRP or transmission point, TP), etc., can also be 5G (NR) The gNB or transmission point (TRP or TP) in the system, the antenna panel of one or a group of base stations (including multiple antenna panels) in the 5G system, or the network node constituting the gNB or transmission point.

The embodiment of the present application may be applied to a random access process. In the embodiment of the present application, the process of transmitting small packets of data during the random access process may be shown in FIG. 2, which mainly includes a four-step message flow:

Step 201: The terminal device sends a random access preamble to the network device to initiate a random access process, and sends an EDT through the random access process.

The random access preamble is also referred to as message 1 (msg 1).

Step 202: The network device sends a random access response (RAR) to the terminal device.

Specifically, if the network device successfully detects the random access preamble sent by the terminal device, it sends a random access response corresponding to the random access preamble. The RAR may include information such as uplink grant (UpLink grant, UL grant) and the like. The RAR is also called message 2 (msg 2) of the random access procedure.

The network device may instruct the terminal device to send a message 3 (message 3, msg 3) including user data or EDT through the RAR.

It should be noted that, among the message 3 sent by the terminal device, the message 3 including user data may be referred to as an EDT message 3 or a message 3 including EDT; the message 3 not including user data may be referred to as a legacy message 3, Or message 3 that does not include EDT.

Step 203: The terminal device sends an EDT message 3 to the network device according to the RAR.

Specifically, if the terminal device successfully receives the RAR in the RAR monitoring window, it will transmit an EDT message 3 (message 3, msg 3) on the resource designated by the uplink authorization in the RAR.

It should be noted that the user data included in the EDT message 3 sent by the terminal device refers to early data.

Step 204: The network device sends a contention resolution message to the terminal device. This message can also be called message 4 (message 4, msg 4).

Through the above process, if the terminal device includes user data in the sent message 3, the user data transmission can be completed in the random access process.

With reference to the above description, as shown in FIG. 3, it is a schematic flowchart of a communication method according to an embodiment of the present application. Referring to FIG. 3, the method includes:

Step 301: The network device sends a DCI to the terminal device, where the DCI is used to instruct retransmission of message 3 in the random access process.

The DCI includes a first indication. The value of the first indication is used to indicate that the value of the first indication is within the range of the first value. The retransmitted message 3 is different from the message 3 that the terminal device has sent during the random access process, and The scheduling delay of the retransmitted message 3 is the first delay; the value of the first indication is used for indication within the range of the second value, and the retransmitted message 3 is in the same range as the terminal device. The message 3 sent in the random access process is the same, and the scheduling delay of the resent message 3 is a second delay; wherein the first delay is greater than the second delay, and the resending The scheduling delay of the sent message 3 is a delay between a physical uplink shared channel (PUSCH) carrying the resent message 3 and the DCI.

For example, as shown in FIG. 4, in FIG. 4, the DCI includes downlink resource indication information, and the downlink resource indication information is used to indicate a PUSCH carrying the message 3 retransmitted by the terminal device, and the scheduling of the message 3 retransmitted by the terminal device The delay is the delay between the last subframe of the DCI shown in FIG. 4 and the start subframe of the PUSCH.

It should be noted that the PUSCH here may include a narrowband physical uplink shared channel (narrowband physical uplink shared channel, NPUSCH). Optionally, the first value range is different from the second value range and there is no intersection.

Step 302: The terminal device receives the DCI sent by the network device, and determines a scheduling delay of the message 3 resent by the terminal device according to the first indication in the DCI.

Step 303: The terminal device resends message 3 to the network device according to the determined scheduling delay.

Step 304: The network device receives message 3 resent by the terminal device.

Through the above method, the first instruction value range indicates the scheduling delay of message 3 resent by the terminal device, so that the terminal device can delay and send different messages 3 at different scheduling times, thereby completing random access.

Before step 301, the terminal device may also send a random access preamble to the network device; the random access preamble is used to initiate a random access process and is used to indicate that the terminal device needs to send user data through the random access process. In this way, the network device may receive a random access preamble sent by the terminal device, and may send an RAR to the terminal device. The RAR corresponds to the random access preamble. The RAR includes an uplink scheduling authorization, and the uplink scheduling authorization is used for The terminal device schedules uplink resources. The network device may instruct the terminal device to send a message 3 including EDT or a message 3 including user data during the random access process through the RAR.

After receiving the RAR sent by the network device, the terminal device may send a message 3 including EDT on the uplink resource indicated by the uplink scheduling authorization scheduling in the RAR. The network device determines that in the random access process, the message 3 including the EDT sent by the terminal device is not correctly received, and then the above step 301 is performed, that is, the DCI is sent to the terminal device. Correspondingly, if the network device determines that the message 3 including the EDT sent by the terminal device is correctly received during the random access process, the remaining random access process is completed according to the existing technology, and details are not described herein again.

In a possible implementation manner, the first indication may be a modulation and coding strategy (MCS) domain in DCI, or other domains in DCI. The first indication is an MCS domain as an example below. It will be described, and other situations are not repeated here.

In the embodiment of the present application, the DCI may further include a second indication, and the second indication may be defined as a scheduling delay domain. The second indication is used to indicate a delay between the PUSCH carrying the message 3 retransmitted by the terminal device and the DCI.

In the embodiment of the present application, the MCS domain is not only used to indicate the modulation and coding strategy of message 3 retransmitted by the terminal device, but also used to indicate the type of message 3 retransmitted by the terminal device.

In the embodiment of the present application, when the value of the first indication is within the first value range, the resent message 3 is not the same as the message 3 that the terminal device has sent during the random access process. Same; when the value of the first indication is within the range of the second value, the resent message 3 is the same as the message 3 that the terminal device has sent during the random access process. Further, the message 3 that the terminal device has sent during the random access process includes user data or includes EDT. At this time, when the first indication is within the first value range, the first Indicating that the retransmitted message 3 does not include user data or EDT; when the first indication is within a second value range, the first indication indicates the retransmitted message 3 Include user data, or include EDT.

For example, if the first value range is [0, 2], that is, when the MCS field is greater than or equal to 0 and less than or equal to 2, the MCS field indicates that the retransmitted message 3 does not include user data, or does not include user data EDT; the second value range is [3, 15], that is, when the MCS field is greater than or equal to 3 and less than or equal to 15, the MCS field indicates that the retransmitted message 3 includes user data or EDT.

Of course, the above is only an example. There may be other cases for the first value range and the second value range. For example, the first value range is greater than or equal to 0 and less than or equal to 7, and the second value range is greater than or Equal to 8 and less than or equal to 15. For another example, the first value range is greater than or equal to 0 and less than or equal to 3, and the second value range is greater than or equal to 4 and less than or equal to 15. Other situations are not repeated here.

The following uses the first indication as the MCS domain and the second indication as the scheduling delay domain as an example to describe how the DCI specifically instructs the terminal device to resend the scheduling delay of the message 3. For other situations, please refer to the description here. To repeat.

The first scenario: The DCI includes the MCS domain, but does not include the scheduling delay domain. In this scenario, the MCS domain can be used to indicate the scheduling delay.

In the embodiment of the present application, the MCS domain is redefined. The MCS domain is used not only to indicate the modulation and coding strategy, but also to instruct the terminal device to resend the scheduling delay of message 3. In this implementation manner, when the MCS domain is within the first value range, the scheduling delay of the retransmitted message 3 is the first delay; when the MCS domain is within the second value range, all The scheduling delay of the retransmitted message 3 is the second delay.

In the above method, the message 3 instructed by the first instruction to retransmit the terminal device is different from the message 3 transmitted by the terminal device during the random access process, so the indicated scheduling delay is the first delay, which is relative to the second The delay is large, so that the terminal device can have enough time to reconstruct message 3 and complete random access.

For example, the first value range is greater than or equal to 0 and less than or equal to 2, the corresponding scheduling delay, that is, the first delay is 12ms (milliseconds); the second value range is greater than or equal to 3, and When it is less than or equal to 15, the corresponding scheduling delay, that is, the second delay is 8ms. At this time, the relationship between the MCS domain and the scheduling delay can be shown in Table 1.

Table 1

MCS domain	Scheduling delay
[0,2]	12ms
[3,15]	8ms

For another example, the first value range is greater than or equal to 0 and less than or equal to 7, the corresponding scheduling delay, that is, the first delay is 12ms; the second value range is greater than or equal to 8, and less than or When it is equal to 15, the corresponding scheduling delay, that is, the second delay is 4ms. At this time, the relationship between the MCS domain and the scheduling delay can be shown in Table 2.

Table 2

MCS domain	Scheduling delay
[0,7]	12ms
[8,15]	4ms

For another example, the first value range is greater than or equal to 0 and less than or equal to 3, the corresponding scheduling delay, that is, the first delay is 12ms; the second value range is greater than or equal to 4, and less than or When it is equal to 15, the corresponding scheduling delay, that is, the second delay is 4ms. At this time, the relationship between the MCS domain and the scheduling delay can be shown in Table 3.

table 3

MCS domain	Scheduling delay
[0,3]	12ms
[4,15]	4ms

The second scenario: the DCI includes the MCS domain and includes the scheduling delay domain. In this scenario, the MCS domain and the scheduling delay domain can jointly indicate the scheduling delay.

In a possible implementation manner, when the second indication is a preset value and the first indication is within the first value range, the scheduling delay of the message 3 resent by the terminal device is the first delay; When the two indications are the preset value and the first indication is within the second value range, the scheduling delay of the message 3 resent by the terminal device is the second delay. When the second indication is a value other than the preset value, the scheduling delay of the message 3 retransmitted by the terminal device is a value corresponding to the second indication.

For example, the preset value is 0, the first delay is 12ms, and the second delay is 8ms. The first value range is greater than or equal to 0 and less than or equal to 2, and the second value range is greater than or equal to 3 and less than or equal to 15. When the scheduling delay domain is 0 and the MCS domain is within the first value range, the scheduling delay for message 3 resent by the terminal device is 12ms; when the scheduling delay domain is 0 and the MCS domain is at the second value When within range, the scheduling delay for message 3 resent by the terminal device is 8ms. When the scheduling delay domain is a value other than the preset value, the correspondence between the scheduling delay domain and the scheduling delay of the message 3 resent by the terminal device can be referred to Table 4 as shown in Table 4.

Table 4

Scheduling delay domain	Scheduling delay
0 and 0≤MCS domain≤2	12ms
0 and 3≤MCS domain≤15	8ms
1	16ms
2	32ms
3	64ms

Of course, Table 4 is only an example, and there may be other corresponding relationships, which will not be repeated here.

By the above method, after the message 3 including the EDT that the terminal device needs to send fails, because the DCI sent by the network device is 0≤MCS domain≤2, the terminal device needs to send the message 3 not including user data. Therefore, when the scheduling delay domain is 0 and 0≤MCS domain≤2, the corresponding first delay is large, which can increase the scheduling delay of message 3 resent by the terminal device, so that the terminal device gets more time. Regenerate message 3 without user data to complete random access.

In the embodiment of the present application, after receiving the DCI sent by the network device, the terminal device determines, according to the DCI, that the scheduling delay of the network device instructing the retransmitted message 3 is less than or equal to a preset time delay, and may also directly terminate the random access The entry process is described in detail below.

As shown in FIG. 5, it is a schematic flowchart of a communication method according to an embodiment of the present application. Referring to FIG. 5, the method includes:

Step 501: The network device sends a DCI to the terminal device, where the DCI is used to instruct retransmission of message 3 in a random access process, and the DCI includes a first indication.

Step 502: If the first indication is within a first value range, the network device terminates the random access.

The value of the first indication is used for indication within a first value range, and the retransmitted message 3 is different from the message 3 that the terminal device has sent during the random access process.

Further, the value of the first indication is used for indication within a second value range, and the resent message 3 is the same as the message 3 that the terminal device has sent during the random access process.

Specifically, the network device may no longer monitor whether the terminal device resends message 3, thereby realizing termination of the random access.

Step 503: The terminal device receives the downlink control information DCI sent by the network device during the random access process.

The DCI includes a first indication; the DCI is used to instruct the terminal device to resend message 3 in the random access process.

Step 504: If the first indication is within a first value range, the terminal device terminates the random access.

Through the above method, the terminal device can determine whether to terminate the random access according to the value of the first indication in the DCI, so that the terminal device can determine in advance whether the random access process is successful, thereby improving the flexibility of the terminal device and avoiding In the event of an access failure, random access continues to be completed and system resources are wasted.

Before step 501, the terminal device may send a random access preamble to the network device; the random access preamble is used to initiate a random access process and is used to indicate that the terminal device needs to send user data through the random access process. After receiving the random access preamble sent by the terminal device, the network device sends a RAR to the terminal device, the RAR corresponds to the random access preamble, the RAR includes an uplink scheduling authorization, and the uplink scheduling authorization is used for the The terminal device schedules uplink resources. The network device may instruct the terminal device to send the message 3 including the EDT or the message 3 including the user data through the RAR.

After the terminal device receives the RAR sent by the network device, it sends a message 3 including EDT on the uplink resource authorized by the uplink scheduling authorization scheduling in the RAR. The network device determines that during the random access process, the message 3 including the EDT sent by the terminal device is not received correctly, and then sends a DCI to the terminal device.

In the above step 501, the first indication may refer to the MCS domain in the DCI, or may refer to other domains in the DCI. The following description uses the first indication as the MCS domain as an example, and other details are not described herein again. In the embodiment of the present application, the DCI may further include a second indication, and the second indication may be a scheduling delay domain. Regarding the MCS domain and the scheduling delay domain, reference may be made to the description in step 301 in the process shown in FIG. 3, and details are not described herein again.

The following uses the first indication as the MCS domain and the second indication as the scheduling delay domain as an example to describe how the DCI specifically instructs the terminal device to resend the scheduling delay of the message 3. For other situations, please refer to the description here. To repeat.

In the embodiment of the present application, if a network device instructs the terminal device to send a message 3 including user data during a random access process, when the MCS domain in the DCI sent by the network device is within the first value range, the MCS domain The message 3 indicating that the retransmission is different from the message 3 that the terminal device has sent during the random access process; when the MCS domain is within a second value range, the MCS domain indicates The retransmitted message 3 is the same as the message 3 that the terminal device has transmitted during the random access process.

Further, the message 3 that the terminal device has sent during the random access process includes user data or includes EDT. At this time, when the MCS domain is within the first value range, the MCS domain indicates The retransmitted message 3 does not include user data or EDT; when the MCS domain is within the second value range, the MCS domain indicates that the retransmitted message 3 includes user data, or includes EDT.

It should be noted that, in the embodiments of the present application, there may be multiple cases of the first value range and the second value range. For example, the first value range is greater than or equal to 0 and less than or equal to 2; the second value range is greater than or equal to 3 and less than or equal to 15.

Of course, the above is only an example. There may be other cases for the first value range and the second value range. For example, the first value range is greater than or equal to 0 and less than or equal to 7, and the second value range is greater than or Equal to 8 and less than or equal to 15. For another example, the first value range is greater than or equal to 0 and less than or equal to 3, and the second value range is greater than or equal to 4 and less than or equal to 15. Other situations are not repeated here.

In step 504, when the terminal device receives the DCI, the terminal device may determine whether the conflict resolution of the random access is successful or considers whether the random access is successful, and the terminal device may determine to terminate the random access. In, described in detail below.

The first scenario: The DCI includes the MCS domain, but does not include the scheduling delay domain.

In this scenario, if the terminal device determines that the MCS domain is within the first value range, it considers that the conflict resolution of this random access was unsuccessful, or considers that this random access is unsuccessful, so the terminal device can terminate the current time Random access; if the terminal device determines that the MCS domain is within the second value range, the terminal device determines message 3 according to the MCS domain and sends the message 3 to the network device.

The second scenario: the DCI includes the MCS domain and includes the scheduling delay domain.

In this scenario, if the MCS domain is within the first value range and the scheduling delay indicated by the scheduling delay domain is less than or equal to a preset delay, the terminal device considers that the random access The conflict resolution is unsuccessful, or the random access is considered unsuccessful, so the terminal device can terminate the random access. Correspondingly, if the MCS domain is within the second value range, or the scheduling delay indicated by the scheduling delay domain is greater than a preset delay, the terminal device determines message 3 according to the MCS domain, and sends The network device sends the message 3. For a specific method for determining the message 3, reference may be made to the foregoing description, and details are not described herein again.

The preset delay may be 8ms, 4ms, or other values, which will not be illustrated one by one here.

In the embodiment of the present application, there may be a corresponding relationship between the scheduling delay domain and the scheduling delay. For details, refer to Table 5.

table 5

Scheduling delay domain	Scheduling delay
0	8ms
1	16ms
2	32ms
3	64ms

Of course, Table 5 is only an example, and there may be other corresponding relationships, which will not be repeated here.

For example, the first value range is greater than or equal to 0 and less than or equal to 2, and the preset delay may be 8 ms. If the terminal device determines that the MCS domain is 1, is in the first value range, and the scheduling delay domain is 0, and the indicated scheduling delay is 8 ms, the terminal device can terminate the random access.

In the embodiment of the present application, the terminal device may terminate the random access in any of the following ways:

Manner 1: The terminal device stops the contention resolution timer of the random access.

Manner 2: The terminal device keeps the timing of the contention resolution timer of the random access, and waits for the contention resolution timer to time out.

Method 3: The terminal device directly sets the timing of the random access contention resolution timer to a value when it times out.

After the terminal device terminates the random access, the terminal device may also send a random access preamble to the network device, thereby initiating a new random access. The specific process is not repeated here.

As shown in FIG. 6, a schematic structural diagram of a communication device according to an embodiment of the present application is provided. The communication apparatus may be configured to perform an action of a network device or a terminal device in the foregoing method embodiments. The communication apparatus 600 includes a processing unit 601 and a transceiver unit 602.

In the embodiment of the present application, when the communication device 600 performs the actions of the network device in the flow shown in FIG. 3, the processing unit 601 and the transceiver unit 602 respectively perform the following steps:

A processing unit 601, configured to send downlink control information DCI to the terminal device through the transceiver unit 602, where the DCI is used to instruct retransmission of message 3 in a random access process, and the DCI includes a first indication;

The value of the first indication is used to indicate that the value of the first indication is within the range of the first value. The retransmitted message 3 is different from the message 3 that the terminal device has sent during the random access process, and The scheduling delay of the retransmitted message 3 is the first delay; the value of the first indication is used for indication within the range of the second value, and the retransmitted message 3 is in the same range as the terminal device. The message 3 sent in the random access process is the same, and the scheduling delay of the resent message 3 is a second delay; wherein the first delay is greater than the second delay, and the resending The scheduling delay of the sent message 3 is the delay between the PUSCH carrying the resent message 3 and the DCI;

The processing unit 601 is configured to receive the message 3 retransmitted by the terminal device through the transceiver unit 602.

In a possible design, before the transceiver unit 602 sends downlink control information DCI to the terminal device, the transceiver unit 602 is further configured to:

Instruct the terminal device to send a message 3 including user data during the random access process.

In a possible design, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

The resent message 3 does not include user data, and the sent message 3 includes user data.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 2, and the second value range is greater than or equal to 3 and less than or equal to 15.

In a possible design, the second delay is 8 ms; the first delay is 12 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 7, and the second value range is greater than or equal to 8 and less than or equal to 15.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 3, and the second value range is greater than or equal to 4 and less than or equal to 15.

In a possible design, the second delay is 4ms; the first delay is 12ms.

In the embodiment of the present application, when the communication device 600 performs the actions of the terminal device in the process shown in FIG. 3, the processing unit 601601 and the transceiver unit 602 respectively perform the following steps:

The transceiver unit 602 is configured to receive downlink control information DCI sent by the network device, where the DCI is used to instruct a terminal device to resend message 3 in a random access process, and the DCI includes a first indication;

A processing unit 601, configured to determine a scheduling delay of the message 3 retransmitted by the terminal device according to the first instruction;

The value of the first indication is within the first value range, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, and the resent message The scheduling delay of message 3 is the first delay; the value of the first indication is within the second value range, and the resent message 3 and the terminal device have been sent during the random access process. Message 3 is the same, and the scheduling delay of the resent message 3 is a second delay; wherein the first delay is greater than the second delay; the scheduling delay of the resent message 3 Is the delay between the PUSCH carrying the retransmitted message 3 and the DCI.

In a possible design, before the transceiver unit 602 receives the downlink control information DCI sent by the network device, the transceiver unit 602 is further configured to:

Sending a message 3 including user data to the network device during the random access process.

In a possible design, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

The resent message 3 does not include user data, and the sent message 3 includes user data.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 2, and the second value range is greater than or equal to 3 and less than or equal to 15.

In a possible design, the second delay is 8 ms; the first delay is 12 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 7, and the second value range is greater than or equal to 8 and less than or equal to 15.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 3, and the second value range is greater than or equal to 4 and less than or equal to 15.

In a possible design, the second delay is 4ms; the first delay is 12ms.

The communication device 600 is configured to perform the functions of the network device in the flowchart shown in FIG. 5:

The transceiver unit 602 is configured to send downlink control information DCI to a terminal device, where the DCI is used to instruct retransmission of message 3 in a random access process, and the DCI includes a first indication;

A processing unit 601 is configured to terminate the random access if the first indication is within a first value range, where the value of the first indication is used for an instruction within the first value range, so The retransmitted message 3 is different from the message 3 that the terminal device has transmitted during the random access process.

In a possible design, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

The resent message 3 does not include user data, and the sent message 3 includes user data.

In a possible design, the processing unit 601 is specifically configured to:

It is no longer monitored whether the terminal device resends message 3.

In a possible design, the DCI further includes a second indication;

If the first indication is within a first value range, the processing unit 601 is specifically configured to:

If the first indication is within the first value range and the scheduling delay indicated by the second indication is less than or equal to a preset delay, the random access is terminated.

In a possible design, the preset delay is 8 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 2.

In a possible design, the preset delay is 4 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 3, or the first value range is greater than or equal to 0 and less than or equal to 7.

In a possible design, before sending the downlink control information DCI to the terminal device, the transceiver unit 602 is further configured to:

Instruct the terminal device to send a message 3 including user data in a random access process.

The communication device 600 is configured to perform the functions of the terminal device in the flowchart shown in FIG. 5:

The transceiver unit 602 is configured to receive downlink control information DCI sent by a network device in a random access process, where the DCI includes a first indication; the DCI is used to instruct a terminal device to resend the message in the random access process 3 ;

A processing unit 601 is configured to terminate the random access if the first indication is within a first value range, where the value of the first indication is used for an instruction within the first value range, so The retransmitted message 3 is different from the message 3 that the terminal device has transmitted during the random access process.

In a possible design, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

The resent message 3 does not include user data, and the sent message 3 includes user data.

In a possible design, the DCI further includes a second indication;

If the first indication is within a first value range, the processing unit 601 is specifically configured to:

If the first indication is within the first value range and the scheduling delay indicated by the second indication is less than or equal to a preset delay, the random access is terminated.

In a possible design, the preset delay is 8 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 2.

In a possible design, the preset delay is 4 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 3, or the first value range is greater than or equal to 0 and less than or equal to 7.

In a possible design, the processing unit 601 is specifically configured to:

Stopping the contention resolution timer of the random access.

In a possible design, the processing unit 601 is specifically configured to:

Keep the random access contention resolution timer and wait for the contention resolution timer to expire.

In a possible design, before the receiving the downlink control information DCI sent by the network device, the transceiver 703 is further configured to:

Sending a message 3 including user data to the network device during the random access process.

In a possible design, when the first indication is within the second value range, the message 3 indicating the retransmission is the same as the message 3 sent by the terminal device in the random access process.

In a possible design, when the first indication is within the first value range, the resending message 3 indicated by the first indication does not include user data; the first indication is in the first When the value is within the range of two, the first indication indicates that the retransmitted message 3 includes user data.

FIG. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device shown in FIG. 7 may be an implementation manner of a hardware circuit of the communication device shown in FIG. 6. The communication device may be applicable to the flowchart shown in FIG. 3 or FIG. 5 to perform the functions of the terminal device in the foregoing method embodiment. For ease of explanation, FIG. 7 shows only the main components of the communication device. Optionally, the communication device may be a terminal device or a device in the terminal device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and / or Discrete devices. Optionally, taking the communication device as a terminal device as an example, as shown in FIG. 7, the communication device 700 includes a processor 701, a memory 702, a transceiver 703, an antenna 704, and an input-output device 705. The processor 701 is mainly used for processing communication protocols and communication data, and controlling the entire wireless communication device, executing software programs, and processing data of the software programs, for example, for supporting the wireless communication device to execute the methods described in the foregoing method embodiments Action, etc. The memory 702 is mainly used to store software programs and data. The transceiver 703 is mainly used for converting baseband signals and radio frequency signals and processing radio frequency signals. The antenna 704 is mainly used for transmitting and receiving radio frequency signals in the form of electromagnetic waves. The input / output device 705, for example, a touch screen, a display screen, a keyboard, etc., is mainly used to receive data input by the user and output data to the user.

The communication device 700 is configured to perform the functions of the terminal device in the flowchart shown in FIG. 3:

The transceiver 703 is configured to receive downlink control information DCI sent by the network device, where the DCI is used to instruct retransmission of message 3 in a random access process, and the DCI includes a first indication;

A processor 701, configured to determine a scheduling delay of the message 3 retransmitted by the terminal device according to the first instruction;

The value of the first indication is within the first value range, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, and the resent message The scheduling delay of message 3 is the first delay; the value of the first indication is within the second value range, and the resent message 3 and the terminal device have been sent during the random access process. Message 3 is the same, and the scheduling delay of the resent message 3 is a second delay; wherein the first delay is greater than the second delay; the scheduling delay of the resent message 3 Is the delay between the PUSCH carrying the retransmitted message 3 and the DCI.

In a possible design, before the transceiver 703 receives the downlink control information DCI sent by the network device, the transceiver 703 is further configured to:

Sending a message 3 including user data to the network device during the random access process.

In a possible design, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

The resent message 3 does not include user data, and the sent message 3 includes user data.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 2, and the second value range is greater than or equal to 3 and less than or equal to 15.

In a possible design, the second delay is 8 ms; the first delay is 12 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 7, and the second value range is greater than or equal to 8 and less than or equal to 15.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 3, and the second value range is greater than or equal to 4 and less than or equal to 15.

In a possible design, the second delay is 4ms; the first delay is 12ms.

The communication device 700 is configured to perform the functions of the terminal device in the flowchart shown in FIG. 5:

The transceiver 703 is configured to receive downlink control information DCI sent by a network device in a random access process, where the DCI includes a first indication; the DCI is used to instruct a terminal device to resend the message in the random access process 3 ;

The processor 701 is configured to terminate the random access if the first indication is within a first value range, where the value of the first indication is used for an instruction within the first value range, so The retransmitted message 3 is different from the message 3 that the terminal device has transmitted during the random access process.

In a possible design, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

The resent message 3 does not include user data, and the sent message 3 includes user data.

In a possible design, the DCI further includes a second indication;

If the first indication is within a first value range, the processor 701 is specifically configured to:

If the first indication is within the first value range and the scheduling delay indicated by the second indication is less than or equal to a preset delay, the random access is terminated.

In a possible design, the preset delay is 8 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 2.

In a possible design, the preset delay is 4 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 3, or the first value range is greater than or equal to 0 and less than or equal to 7.

In a possible design, the processor 701 is specifically configured to:

Stopping the contention resolution timer of the random access.

In a possible design, the processor 701 is specifically configured to:

Keep the random access contention resolution timer and wait for the contention resolution timer to expire.

In a possible design, before the receiving the downlink control information DCI sent by the network device, the transceiver 703 is further configured to:

Sending a message 3 including user data to the network device during the random access process.

In a possible design, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

The resent message 3 does not include user data, and the sent message 3 includes user data.

FIG. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device shown in FIG. 8 may be an implementation manner of a hardware circuit of the communication device shown in FIG. 6. The communication device may be applicable to the flowchart shown in FIG. 3 or FIG. 5 to execute the functions of the network device in the foregoing method embodiment. For ease of explanation, FIG. 8 shows only the main components of the communication device. Optionally, the communication device may be a network device or a device in the network device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and / or Discrete devices. Optionally, the communication device is a network device as an example. As shown in FIG. 8, the communication device 800 includes a processor 801, a memory 802, a transceiver 803, an antenna 804, and the like.

The communication device 800 is configured to perform the functions of the network device in the flowchart shown in FIG. 3:

A processor 801, configured to send downlink control information DCI to a terminal device through a transceiver 803, where the DCI is used to instruct retransmission of message 3 in a random access process, and the DCI includes a first indication;

The value of the first indication is used to indicate that the value of the first indication is within the range of the first value. The retransmitted message 3 is different from the message 3 that the terminal device has sent during the random access process, The scheduling delay of the retransmitted message 3 is the first delay; the value of the first indication is used for indication within the range of the second value, and the retransmitted message 3 is in the same range as the terminal device. The message 3 sent in the random access process is the same, and the scheduling delay of the resent message 3 is a second delay; wherein the first delay is greater than the second delay, and the resending The scheduling delay of the sent message 3 is the delay between the physical uplink shared channel PUSCH carrying the resent message 3 and the DCI;

The processor 801 is configured to receive the message 3 retransmitted by the terminal device through the transceiver 803.

In a possible design, before the transceiver 803 sends downlink control information DCI to the terminal device, the transceiver 803 is further configured to:

Instruct the terminal device to send a message 3 including user data during the random access process.

In a possible design, when the first indication is within the first value range, the resending message 3 indicated by the first indication does not include user data; the first indication is in the first When the value is within the range of two, the first indication indicates that the retransmitted message 3 includes user data.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 2, and the second value range is greater than or equal to 3 and less than or equal to 15.

In a possible design, the second delay is 8 ms; the first delay is 12 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 7, and the second value range is greater than or equal to 8 and less than or equal to 15.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 3, and the second value range is greater than or equal to 4 and less than or equal to 15.

In a possible design, the second delay is 4ms; the first delay is 12ms.

The communication device 800 is configured to perform the functions of the network device in the flowchart shown in FIG. 5:

The transceiver 803 is configured to send downlink control information DCI to the terminal device, where the DCI is used to instruct the terminal device to resend message 3 in the random access process, and the DCI includes a first indication;

The processor 801 is configured to terminate the random access if the first indication is within a first value range, where the value of the first indication is used for an instruction within the first value range, so The retransmitted message 3 is different from the message 3 that the terminal device has transmitted during the random access process.

In a possible design, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

The resent message 3 does not include user data, and the sent message 3 includes user data.

In a possible design, the processor 801 is specifically configured to:

It is no longer monitored whether the terminal device resends message 3.

In a possible design, the DCI further includes a second indication;

If the first indication is within a first value range, the processor 801 is specifically configured to:

If the first indication is within the first value range and the scheduling delay indicated by the second indication is less than or equal to a preset delay, the random access is terminated.

In a possible design, the preset delay is 8 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 2.

In a possible design, the preset delay is 4 ms.

In a possible design, the first value range is greater than or equal to 0 and less than or equal to 3, or the first value range is greater than or equal to 0 and less than or equal to 7.

In a possible design, before sending the downlink control information DCI to the terminal device, the transceiver 803 is further configured to:

Instruct the terminal device to send a message 3 including user data.

In a possible design, when the first indication is within the first value range, the resending message 3 indicated by the first indication does not include user data; the first indication is in the first When the value is within the range of two, the first indication indicates that the retransmitted message 3 includes user data.

Those skilled in the art should understand that the embodiments of the present application may be provided as a method, a system, or a computer program product. Therefore, this application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, this application may take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, etc.) containing computer-usable program code.

This application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to this application. It should be understood that each process and / or block in the flowcharts and / or block diagrams, and combinations of processes and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to produce a machine, so that the instructions generated by the processor of the computer or other programmable data processing device are used to generate instructions Means for implementing the functions specified in one or more flowcharts and / or one or more blocks of the block diagrams.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to work in a particular manner such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, the instructions The device implements the functions specified in one or more flowcharts and / or one or more blocks of the block diagram.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these changes and variations.

Claims (30)

1. A communication method, comprising:

   The network device sends downlink control information DCI to the terminal device, where the DCI is used to instruct retransmission of message 3 in the random access process, and the DCI includes a first indication;

   The value of the first indication is used to indicate that the value of the first indication is within the range of the first value. The retransmitted message 3 is different from the message 3 that the terminal device has sent during the random access process, and The scheduling delay of the retransmitted message 3 is the first delay; the value of the first indication is used for indication within the range of the second value, and the retransmitted message 3 is in the same range as the terminal device. The message 3 sent in the random access process is the same, and the scheduling delay of the resent message 3 is a second delay; wherein the first delay is greater than the second delay, and the resending The scheduling delay of the sent message 3 is the delay between the physical uplink shared channel PUSCH carrying the resent message 3 and the DCI;

   The network device receives message 3 resent by the terminal device.
2. The method according to claim 1, wherein before the network device sends the downlink control information DCI to the terminal device, the method further comprises:

   The network device shown instructs the terminal device to send a message 3 including user data during the random access process.
3. The method according to claim 1 or 2, wherein the retransmitted message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

   The resent message 3 does not include user data, and the sent message 3 includes user data.
4. The method according to any one of claims 1 to 3, wherein the first value range is greater than or equal to 0 and less than or equal to 2, the second value range is greater than or equal to 3, and Less than or equal to 15.
5. The method according to any one of claims 1 to 4, wherein the second delay is 8 ms; and the first delay is 12 ms.
6. The method according to any one of claims 1 to 3, wherein the first value range is greater than or equal to 0 and less than or equal to 7, the second value range is greater than or equal to 8, and Less than or equal to 15.
7. The method according to any one of claims 1 to 3, wherein the first value range is greater than or equal to 0 and less than or equal to 3, and the second value range is greater than or equal to 4 and Less than or equal to 15.
8. The method according to any one of claims 1, 2, 3, 6, or 7, wherein the second delay is 4 ms; and the first delay is 12 ms.
9. A communication method, comprising:

   Receiving, by the terminal device, downlink control information DCI sent by the network device, where the DCI is used to instruct the terminal device to resend message 3 in the random access process, and the DCI includes a first indication;

   Determining, by the terminal device according to a first instruction, a scheduling delay of message 3 retransmitted by the terminal device;

   Wherein, the value of the first indication is within the first value range, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, and the resending message 3 The scheduling delay of the sent message 3 is the first delay; the value of the first indication is within the second value range, and the resent message 3 and the terminal device are in the random access process. The sent message 3 is the same, and the scheduling delay of the resent message 3 is a second delay; wherein the first delay is greater than the second delay; the scheduling of the resent message 3 The delay is a delay between a physical uplink shared channel PUSCH carrying the retransmitted message 3 and the DCI.
10. The method according to claim 9, wherein before the terminal device receives the downlink control information DCI sent by the network device, the method further comprises:

    The terminal device sends a message 3 including user data to the network device during the random access process.
11. The method according to claim 9 or 10, wherein the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

    The resent message 3 does not include user data, and the sent message 3 includes user data.
12. The method according to any one of claims 9 to 11, wherein the first value range is greater than or equal to 0 and less than or equal to 2, the second value range is greater than or equal to 3, and Less than or equal to 15.
13. The method according to any one of claims 9 to 12, wherein the second delay is 8 ms; and the first delay is 12 ms.
14. The method according to any one of claims 9 to 11, wherein the first value range is greater than or equal to 0 and less than or equal to 7, the second value range is greater than or equal to 8, and Less than or equal to 15.
15. The method according to any one of claims 9 to 11, wherein the first value range is greater than or equal to 0 and less than or equal to 3, and the second value range is greater than or equal to 4 and Less than or equal to 15.
16. The method according to any one of claims 9, 10, 11, 14, or 15, wherein the second delay is 4 ms; and the first delay is 12 ms.
17. A communication device, comprising:

    A processing unit, configured to send downlink control information DCI to a terminal device through a transceiver unit, where the DCI is used to instruct retransmission of message 3 in a random access process, and the DCI includes a first indication;

    The value of the first indication is used to indicate that the value of the first indication is within the range of the first value. The retransmitted message 3 is different from the message 3 that the terminal device has sent during the random access process, and The scheduling delay of the retransmitted message 3 is the first delay; the value of the first indication is used for indication within the range of the second value, and the retransmitted message 3 is in the same range as the terminal device. The message 3 sent in the random access process is the same, and the scheduling delay of the resent message 3 is a second delay; wherein the first delay is greater than the second delay, and the resending The scheduling delay of the sent message 3 is the delay between the physical uplink shared channel PUSCH carrying the resent message 3 and the DCI;

    The processing unit is configured to receive the message 3 retransmitted by the terminal device through the transceiver unit.
18. The apparatus according to claim 17, wherein before the sending and receiving unit sends downlink control information DCI to the terminal device, the sending and receiving unit is further configured to:

    Instruct the terminal device to send a message 3 including user data during the random access process.
19. The apparatus according to claim 17 or 18, wherein the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

    The resent message 3 does not include user data, and the sent message 3 includes user data.
20. The device according to any one of claims 17 to 19, wherein the first value range is greater than or equal to 0 and less than or equal to 2, the second value range is greater than or equal to 3, and Less than or equal to 15.
21. The device according to any one of claims 17 to 20, wherein the second delay is 8 ms; and the first delay is 12 ms.
22. The device according to any one of claims 17 to 19, wherein the first value range is greater than or equal to 0 and less than or equal to 7, the second value range is greater than or equal to 8, and Less than or equal to 15.
23. The device according to any one of claims 17 to 19, wherein the first value range is greater than or equal to 0 and less than or equal to 3, and the second value range is greater than or equal to 4 and Less than or equal to 15.
24. The device according to claim 17, 18, 19, 22 or 23, wherein the second delay is 4 ms; and the first delay is 12 ms.
25. A communication device, comprising:

    The transceiver unit is configured to receive downlink control information DCI sent by the network device, the DCI is used to instruct the terminal device to resend message 3 in the random access process, and the DCI includes a first indication;

    A processing unit, configured to determine a scheduling delay of the message 3 resent by the terminal device according to the first instruction;

    The value of the first indication is within the first value range, the resent message 3 is different from the message 3 that the terminal device has sent during the random access process, and the resent message The scheduling delay of message 3 is the first delay; the value of the first indication is within the second value range, and the resent message 3 and the terminal device have been sent during the random access process. Message 3 is the same, and the scheduling delay of the resent message 3 is a second delay; wherein the first delay is greater than the second delay; the scheduling delay of the resent message 3 Is the delay between the physical uplink shared channel PUSCH carrying the retransmitted message 3 and the DCI.
26. The apparatus according to claim 25, wherein before the transceiver unit receives the downlink control information DCI sent by the network device, the transceiver unit is further configured to:

    Sending a message 3 including user data to the network device during the random access process.
27. The apparatus according to claim 25 or 26, wherein the retransmitted message 3 is different from the message 3 that the terminal device has sent during the random access process, including:

    The resent message 3 does not include user data, and the sent message 3 includes user data.
28. The device according to any one of claims 25 to 27, wherein the first value range is greater than or equal to 0 and less than or equal to 2, the second value range is greater than or equal to 3, and Less than or equal to 15.
29. A communication device, comprising a processor, which is configured to be coupled to a memory, read and execute instructions in the memory to implement the method according to any one of claims 1 to 16.
30. A readable storage medium, comprising a program or an instruction, and when the program or the instruction is executed, the method according to any one of claims 1 to 16 is executed.

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