WO2021163832A1

WO2021163832A1 - Data transmission method and apparatus

Info

Publication number: WO2021163832A1
Application number: PCT/CN2020/075508
Authority: WO
Inventors: 许斌; 李秉肇; 陈磊; 王宏
Original assignee: 华为技术有限公司
Priority date: 2020-02-17
Filing date: 2020-02-17
Publication date: 2021-08-26

Abstract

The present application provides a data transmission method and apparatus. In said method, a first access network device can send mode switching request information to a second access network device, so that the first access network device or the second access network device can switch the transmission mode of a first service into a first transmission mode, and then can dynamically switch between unicast transmission and multicast transmission, improving transmission flexibility. In the case of switching to the unicast transmission, a core network device determines, according to second indication information from the first access network device, a first data packet sent to the first access network device after the first access network device switches to the first transmission mode, thereby ensuring the continuity of a first service.

Description

Method and device for data transmission

Technical field

This application relates to the field of communications, and more specifically, to methods and devices for data transmission in the field of communications.

Background technique

In the prior art, the downlink data transmission service provided by the wireless communication system for the terminal device can generally be divided into two types: unicast service and broadcast multicast service.

Unicast is a point-to-point communication, that is, a single point of communication between network equipment and terminal equipment. The network equipment can send data to each terminal device to achieve personalized services, but the number of terminal devices is large and the access traffic of the terminal device At large, all unicast data transmission methods will make the network equipment overwhelmed. Broadcast multicast can support point-to-multipoint communication, that is, network devices transmit the same data to multiple terminal devices, such as mobile TV services. At present, there are multicast broadcast single frequency network (MBSFN) and single-cell point-to-multipoint (single-cell point-to-multipoint, SC- PTM) Two transmission modes of multimedia broadcast multicast service (MBMS). The SC-PTM transmission mode only supports single-cell transmission, which does not support mobility, and because the coverage of a single cell is small, Compared with unicast transmission, the gain is not obvious, and the MBSFN transmission mode needs to be statically deployed in the broadcast area and cannot support flexible broadcast area adjustment.

The fifth generation of mobile communication technology (the 5th generation, 5G) new radio (NR) system is the next-generation wireless communication system of the LTE system. With the application of broadcast-multicast communication modes becoming more and more extensive and transmission requirements diversified In order to transmit the emerging broadcast services more efficiently, the communication system needs to support the dynamic deployment of the transmission mode. If the transmission is always performed according to the configured transmission mode, the flexibility is poor and the communication needs cannot be met.

Therefore, how the communication system can configure the transmission mode flexibly and efficiently is a technical problem that needs to be solved urgently.

Summary of the invention

The present application provides a data transmission method and device, which can dynamically switch the transmission mode of the transmitted data, thereby improving flexibility and meeting communication requirements.

In the first aspect, a method of data transmission is provided. The method may be executed by a first communication device. The first communication device may be a communication device or a communication device capable of supporting the communication device to implement the functions required by the method, such as a chip system. . Exemplarily, the first communication device is a first access network device, and the method includes: determining mode switching request information, where the mode switching request information is used to request to switch the transmission mode of the first service to the first transmission mode , The first transmission mode includes multicast or unicast; sending the mode switching request information to the second access network device.

In the above technical solution, the first access network device can send the mode switching request information to the second access network device, so that the first access network device or the second access network device can switch the transmission mode of the first service to the first access network device. A transmission mode can improve flexibility and meet diversified communication requirements. For example, the first access network device or the second access network device can switch the transmission mode of the first service from unicast to multicast. For another example, the first access network device or the second access network device can switch the transmission mode of the first service to multicast. The transmission mode of a service is switched from multicast to unicast.

In some possible implementations, multicast may include MBSFN transmission. That is, the first access network device or the second access network device can switch the transmission mode of the first service from unicast to MBSFN transmission, or the first access network device or the second access network device can switch the transmission mode of the first service to MBSFN transmission. The transmission mode of the service is switched from MBSFN transmission to unicast.

It is understandable that the mode switching request information does not limit that the transmission mode of the first service must be switched to the first transmission mode, and can also be used only to turn off or on the transmission mode of the first service, and does not limit the transmission mode of the first service. The transmission mode used after the transmission mode of the first service is turned off or on. For example, the mode switching request information may be used to indicate the turning off or on of the MBSFN transmission mode used by the first service. Although the switching to the first transmission mode is used as an example in this application, all the descriptions are also applicable to scenarios where the first service transmission mode is turned on or off.

In some possible implementation manners, the method further includes: sending first indication information to a core network device, where the first indication information is used to instruct the core network device to activate or deactivate the first transmission channel, and the first transmission channel is A transmission channel is used for the core network device to transmit the first service to the first access network device. The first transmission channel may be a protocol data unit (protocol data unit, PDU) between a core network device and the first access network device or a general radio packet service tunnel protocol (GPRS tunnel protocol, GTP) (wherein GPRS is the abbreviation of general packet radio service) tunnel or quality of service (QoS) flow or other types of transmission paths. The meaning of activation here can be that the transmission channel between the core network device and the first access network device is established, but the use has not been started, and the use is activated according to the first instruction information after the first instruction information is received; or also It may be that the first transmission channel starts to be established after receiving the first indication information, and the established first transmission channel is used. Wherein, the establishment process may be a process of sending relevant configuration information of the first transmission channel.

As an example, if the first transmission mode includes unicast, the first indication information is used to instruct the core network device to activate the first transmission channel. If the first transmission mode includes multicast, the first indication information is used to instruct the core network device to deactivate the first transmission channel.

In some possible implementation manners, the method further includes: sending second indication information to a core network device, where the second indication information is used to indicate a first data packet, and the first data packet is in the first data packet. After the access network device switches the first transmission mode or activates the first transmission channel, the core network device transmits the first data packet of the first service to the first access network device or initiates data pack.

In some possible implementation manners, the second indication information includes a first sequence number, and the first sequence number is used to indicate a sequence of the first data packet in at least one data packet of the first service.

In the above technical solution, the core network device can ensure the continuity of the first service through the second indication information.

The aforementioned first serial number may be a serial number allocated by the core network device to the first data packet.

Optionally, the first indication information and the second indication information may be carried in the same message and sent, which is not limited in the embodiment of the present application.

In some possible implementation manners, the method further includes: receiving third indication information from the second access network device, where the third indication information is used to indicate a second data packet, and the second data packet For the first service transmitted by the second access network device to the first access network device before the first access network device switches the first transmission mode or before the first transmission channel is activated The last packet.

In some possible implementation manners, the third indication information includes a second sequence number, and the second sequence number is used to indicate a sequence of the second data packet in at least one data packet of the first service.

The foregoing second serial number may be a serial number allocated by the core network device to the second data packet.

In some possible implementation manners, the first access network device may send the second indication information to the core network device according to the third indication information. The second data packet indicated by the third indication information is that before the first access network device switches the first transmission mode or before the first transmission channel is activated, the second access network device sends the data to the first access network device. The last data packet of the first service transmitted by the network access device, and the first data packet indicated by the second indication information is after the first access network device switches the first transmission mode or activates the first transmission channel Afterwards, the first data packet of the first service transmitted by the core network device to the first access network device. In this way, the first access network device determines the first data packet after switching the first transmission mode or after activating the first transmission channel according to the last data packet before switching the first transmission mode or before activating the first transmission channel, thereby ensuring that The continuity of data packets of the first service.

Optionally, the second data packet and the first data packet are two data packets with consecutive serial numbers. For example, the serial number of the second data packet is X, and the serial number of the first data packet is X+1. Therefore, to a certain extent, the second indication information and the third indication information can be equivalent. The second indication information indicates that the sequence number of the first data packet is X+1, and the third indication information indicates that the sequence number of the second data packet is X. If you know the second indication information, you can learn the third indication information and know the third indication. The information can learn the second instruction information.

In some possible implementation manners, the method further includes: sending the third data packet to a terminal device according to fourth instruction information, the third data packet being a data packet of the first service, and the fourth The indication information comes from the second access network device and is used to indicate at least one of the following: the time domain resource and/or frequency domain resource of the third data packet sent by the first access network device to the terminal device; Processing information of the third data packet.

Optionally, the third data packet is sent by the second access network device to the first access network device.

The processing information of the third data packet may include: service data adaptation protocol (SDAP) layer, packet data convergence protocol (packet data convergence protocol, PDCP) layer, radio link control (radio link control, RLC) Information corresponding to at least one processing method of at least one protocol layer such as medium access control (MAC) layer, physical (physical, PHY) layer, etc. The processing method includes how to perform the functions of each protocol layer, such as how to Perform RLC layer data packet segmentation, and how to perform MAC layer data packet multiplexing, etc. The complete function of each protocol layer can refer to the content of the 3GPP official website protocol specification, due to the large amount of content, it will not be repeated here.

In some possible implementation manners, the method further includes: receiving response information of the mode switching request information from the second access network device, where the response information is used to confirm that the first access network device switches the first access network device. The transmission mode of a service is the first transmission mode.

Optionally, the third indication information may indicate response information of the mode switching request information. Or the second access network device may carry the third indication information and the response information of the mode switching request information in the same message or different messages and send it to the first access network device.

In a second aspect, a method of data transmission is provided. The method can be executed by a second communication device. The second communication device can be a communication device or a communication device capable of supporting the communication device to implement the functions required by the method, such as a chip system. . Exemplarily, the second communication device is a second access network device, and the method includes: receiving mode switching request information from the first access network device, where the mode switching request information is used to request switching of the first service The transmission mode is a first transmission mode, and the first transmission mode includes multicast or unicast; and the response information of the mode switching request information is sent to the first access network device.

Wherein, if the mode switching request information is used to request the first access network device to switch the transmission mode of the first service to the first transmission mode, the response information of the mode switching request information is used to confirm that the second access network device accepts the first connection. The network access device switches the transmission mode of the first service to the first transmission mode. If the mode switching request information is used to request the second access network device to switch the transmission mode of the first service to the first transmission mode, if the second access network device supports the first transmission mode, the response information of the mode switching request information is used for It is confirmed that the second access network device switches the transmission mode of the first service to the first transmission mode.

In some possible implementations, multicast may include MBSFN transmission.

In some possible implementation manners, the response information of the mode switching request information may be carried in a new message or in an existing message, for example, it may be carried in a response message of a switching request message.

In some possible implementation manners, the method further includes: sending third indication information to the first access network device, where the third indication information is used to indicate a second data packet, and the second data packet is Before the first access network device switches the first transmission mode or activates the first transmission channel, the last of the first service transmitted by the second access network device to the first access network device One packet.

In some possible implementation manners, the method further includes: sending fourth indication information to the first access network device, where the fourth indication information is used to indicate at least one of the following: the first access network device Send the time domain resource and/or frequency domain resource of the third data packet of the first service to the terminal device; processing information of the third data packet.

The processing information of the third data packet may include information corresponding to at least one processing method of at least one protocol layer such as the SDAP layer, the PDCP layer, the RLC layer, the MAC layer, and the PHY layer. The processing method includes how to perform the processing of each protocol layer. Functions, such as how to perform packet splitting at the RLC layer, and how to perform packet multiplexing at the MAC layer, etc. The complete function of each protocol layer can refer to the content of the 3GPP official website protocol specification, due to the large amount of content, it will not be repeated here.

In some possible implementation manners, the method further includes: sending a third data packet to the first access network device.

In a third aspect, a data transmission method is provided. The method can be executed by a second communication device. The second communication device may be a communication device or a communication device capable of supporting the communication device to implement the functions required by the method, such as a chip system. . Exemplarily, the second communication device is a second access network device, including: determining fifth indication information, where the fifth indication information is used to indicate that the transmission mode for switching the first service is the first transmission mode, and The first transmission mode includes multicast or unicast; sending the fifth indication information to the first access network device.

In the above technical solution, the first access network device can switch the transmission mode of the first service according to the fifth indication information, thereby improving flexibility and meeting diversified communication requirements.

It is understandable that if the first access network device and the second access network device are performing MBSFN transmission, after the second access network device as the control node determines that it does not perform MBSFN transmission, the second access network device The controlled first access network device also cannot perform MBSFN transmission. Therefore, the fifth instruction information may indicate that the transmission mode of the first service of the second access network device is unicast. In this way, the first access network device determines that the second access network device does not use MBSFN transmission according to the fifth instruction information. The first service, and at the same time, the first access network device determines that it does not use MBSFN to transmit the first service, so it uses unicast to transmit the first service. In other words, the fifth instruction information can directly instruct the first access network device to switch the transmission mode of the first service to unicast, or indirectly indicate by instructing the second access network device to switch the transmission mode of the first service to unicast. Switch the transmission mode of the first service of the first access network device to unicast. In this way, transmission errors caused by the first access network device controlled by the second access network device still performing MBSFN transmission can be avoided. At the same time, it can also avoid that the first access network device controlled by the second access network device still waits for the multicast data from the second access network device, so that the first access network device can perform unicast transmission in time, thereby Can improve transmission efficiency.

In some possible implementation manners, the second access network device may be a control node of the first access network device.

In some possible implementation manners, devices other than the second access network device may also be control nodes of the first access network device.

In some possible implementation manners, the method further includes: sending sixth indication information to a core network device, where the sixth indication information is used to instruct the core network device to activate or deactivate the first transmission channel, and the first transmission channel is A transmission channel is used for the core network device to transmit the first service to the first access network device.

If the first transmission mode is unicast, the sixth indication information is used to instruct the core network device to activate the first transmission channel. If the first transmission mode is multicast, the sixth indication information is used to instruct the core network device to deactivate the first transmission channel.

In some possible implementation manners, the method further includes: sending seventh indication information to the core network device or the first access network device, where the seventh indication information is used to indicate a fourth data packet, and the The fourth data packet is that before the first access network device or the second access network device switches the first transmission mode or before the first transmission channel is activated, the second access network device sends the data to the The last data packet of the first service transmitted by the first access network device.

In some possible implementation manners, the seventh indication information includes a third sequence number, and the third sequence number is used to indicate a sequence of the fourth data packet in at least one data packet of the first service.

The foregoing third sequence number may be a sequence number allocated by the core network device to the fourth data packet.

In some possible implementation manners, if the second access network device sends the sixth indication information and the seventh indication information to the core network device, the sixth indication information and the seventh indication information can be carried in one message or carried In different news.

In some possible implementation manners, the method further includes: receiving response information of the fifth indication information from the first access network device, where the response information is used to confirm that the first access network device is handed over. The transmission mode of the first service is the first transmission mode.

In a fourth aspect, a data transmission method is provided. The method may be executed by a first communication device. The first communication device may be a communication device or a communication device capable of supporting the communication device to implement the functions required by the method, such as a chip system. . Exemplarily, the first communication device is a first access network device, including: receiving fifth instruction information from a second access network device, where the fifth instruction information is used to instruct to switch the transmission mode of the first service It is the first transmission mode, and the first transmission mode includes multicast or unicast.

It is understandable that if the first access network device and the second access network device are performing MBSFN transmission, after the second access network device as the control node determines that it does not perform MBSFN transmission, the second access network device The controlled first access network device also cannot perform MBSFN transmission. Therefore, the fifth instruction information may indicate that the transmission mode of the first service of the second access network device is unicast. In this way, the first access network device determines that the second access network device does not use MBSFN transmission according to the fifth instruction information. The first service, and at the same time, the first access network device determines that it does not use MBSFN to transmit the first service, so it uses unicast to transmit the first service. In other words, the fifth instruction information can directly instruct the first access network device to switch the transmission mode of the first service to unicast, or indirectly indicate by instructing the second access network device to switch the transmission mode of the first service to unicast. Switch the transmission mode of the first service of the first access network device to unicast. In this way, transmission errors caused by the first access network device controlled by the second access network device still performing MBSFN transmission can be avoided. At the same time, it can also avoid that the first access network device controlled by the second access network device still waits for the multicast data from the second access network device, so that the first access network device can perform unicast transmission in time, thereby achieving Dynamic switching of transmission mode improves transmission efficiency.

In some possible implementation manners, the method further includes:

Receive seventh indication information from a second access network device, where the seventh indication information is used to indicate a fourth data packet, where the fourth data packet is in the first access network device or the second access network device Before the network device switches the first transmission mode, the last data packet of the first service transmitted by the second access network device to the first access network device; or the fourth data packet is the core After the network device activates the first transmission channel, the second access network device transmits the last data packet of the first service to the first access network device.

In some possible implementation manners, the method further includes:

Send eighth indication information to the core network device, where the eighth indication information is used to indicate a fifth data packet, where the fifth data packet is a handover between the first access network device or the second access network device After the first transmission mode, the first data packet or the first data packet of the first service transmitted by the core network device to the first access network device; or the fifth data packet is After the core network device activates the first transmission channel, the core network device transmits the first data packet or the first data packet of the first service to the first access network device.

In some possible implementation manners, the seven indication information includes a third sequence number, and the third sequence number is used to indicate the sequence of the fourth data packet in at least one data packet of the first service; The eighth indication information includes a fourth sequence number, and the fourth sequence number is used to indicate the sequence of the fifth data packet in at least one data packet of the first service.

In some possible implementation manners, if the first access network device supports the first transmission mode, a response message of the fifth indication information is sent to the second access network device, and the response information is After confirming that the first access network device switches the transmission mode of the first service to the first transmission mode.

In some possible implementations, the method further includes: receiving fourth indication information from a second access network device, where the fourth indication information is used to indicate at least one of the following: The terminal device sends the time domain resource and/or frequency domain resource of the third data packet of the first service; the processing information of the third data packet; and sends the first data packet to the terminal device according to the fourth instruction information. Three data packets.

In a fifth aspect, a data transmission method is provided. The method can be executed by a third communication device. The third communication device may be a communication device or a communication device capable of supporting the communication device to implement the functions required by the method, such as a chip system. . Exemplarily, the third communication device is a core network device, including:

Receive first indication information from a first access network device or a second access network device, where the first indication information is used to instruct the core network device to activate or deactivate a first transmission channel, and the first transmission channel Used for the core network device to transmit the first service to the first access network device;

Activate or deactivate the first transmission channel according to the first indication information.

In the above technical solution, the core network device can activate the first transmission channel according to the first indication information, which can ensure that the core network device uses the activated first transmission channel to transmit the data of the first service to the first access network device, thereby improving Transmission accuracy; or the core network device can deactivate the first transmission channel according to the first indication information to avoid resource waste caused by not using the first transmission channel after activation, so that resource utilization can be achieved.

In some possible implementation manners, the method further includes: receiving second indication information sent by the first access network device, where the second indication information is used to indicate a first data packet, and the first data packet After the first access network device switches to the first transmission mode or after the core network device activates the first transmission channel, the core network device transmits the first access network device to the first access network device. The first data packet or the first data packet of the service, the first transmission mode includes multicast or unicast; according to the second instruction information, it is sent to the first access network device through the first transmission channel The first data packet.

In some possible implementation manners, the second indication information includes a first sequence number, and the first sequence number is used to indicate a sequence of the first data packet in at least one data packet of the first service;

In some possible implementation manners, the method further includes: receiving seventh indication information sent by the second access network device, where the seventh indication information is used to indicate a fourth data packet, and the fourth data packet is Before the first access network device or the second access network device switches the first transmission mode, the first access network device transmitted by the second access network device to the first access network device The last data packet of the service, or the fourth data packet is the last data packet of the first service transmitted by the second access network device to the first access network device before the core network device activates the first transmission channel;

The core network device sends a fifth data packet to the first access network device through the first transmission channel according to the seventh indication information, where the fifth data packet is a data packet on the first access network device Or after the second access network device switches to the first transmission mode, the core network device transmits the first data packet or the first data packet of the first service to the first access network device, Alternatively, the fifth data packet is the first data packet or the first data packet of the first service transmitted to the first access network device after the core network device activates the first transmission channel, and the first transmission mode includes multicast Or unicast.

In some possible implementation manners, the seven indication information includes a third sequence number, and the third sequence number is used to indicate a sequence of the fourth data packet in at least one data packet of the first service.

In a sixth aspect, a data transmission device is provided, for example, the device is the first communication device as described above. The device is configured to execute the foregoing first aspect or any possible implementation of the first aspect method. Specifically, the device may include a unit for executing the method in the first aspect or any possible implementation of the first aspect.

In some possible implementation manners, the device includes a processing unit and a transceiver unit, wherein the processing unit is used to determine mode switching request information, and the mode switching request information is used to request to switch the transmission mode of the first service as the first service. Transmission mode, the first transmission mode includes multicast or unicast; the transceiver unit is configured to send the mode switching request information to the second access network device.

In some possible implementation manners, the transceiving unit is configured to send first indication information to a core network device, where the first indication information is used to instruct the core network device to activate or deactivate the first transmission channel, and the first transmission channel is A transmission channel is used for the core network equipment to transmit the first service to the device.

In some possible implementations, the transceiving unit is further configured to send second indication information to the core network device, where the second indication information is used to indicate a first data packet, and the first data packet is used in the device After switching the first transmission mode, the core network device transmits the first data packet of the first service to the apparatus.

In some possible implementation manners, the transceiving unit is further configured to receive third indication information from the second access network device, where the third indication information is used to indicate a second data packet, and the second data The packet is the last data packet of the first service transmitted by the second access network device to the device before the device switches the first transmission mode.

In a seventh aspect, a data transmission device is provided, for example, the device is the second communication device as described above. The device is used to execute the foregoing second aspect or any possible implementation of the second aspect. Specifically, the apparatus may include a unit for executing the second aspect or the method in any possible implementation manner of the second aspect.

In a possible implementation manner, the apparatus includes a receiving unit and a sending unit, and the receiving unit is configured to receive mode switching request information from the first access network device, and the mode switching request information is used to request to switch the first access network device. The transmission mode of a service is a first transmission mode, and the first transmission mode includes multicast or unicast; the sending unit is configured to send response information of the mode switching request information to the first access network device.

In a possible implementation manner, the sending unit is further configured to send third indication information to the first access network device, where the third indication information is used to indicate a second data packet, and the second data The packet is the last data packet of the first service transmitted by the apparatus to the first access network device before the first access network device switches the first transmission mode.

In a possible implementation manner, the sending unit is further configured to: send fourth indication information to the first access network device, where the fourth indication information is used to indicate at least one of the following: the first access network device The network access device sends the time domain resource and/or frequency domain resource of the third data packet of the first service to the terminal device;

Processing information of the third data packet.

In an eighth aspect, a data transmission device is provided, for example, the device is the second communication device as described above. The device is used to execute the foregoing third aspect or the method in any possible implementation manner of the third aspect. Specifically, the device may include a unit for executing the third aspect or the method in any possible implementation manner of the third aspect.

In some possible implementations, the device includes a processing unit and a transceiving unit, wherein the processing unit is used to determine fifth indication information, and the fifth indication information is used to instruct to switch the transmission mode of the first service to the first Transmission mode, the first transmission mode includes multicast or unicast; the transceiver unit is configured to send the fifth indication information to the first access network device.

In some possible implementation manners, the transceiving unit is further configured to send sixth indication information to the core network device, where the sixth indication information is used to instruct the core network device to activate or deactivate the first transmission channel, and The first transmission channel is used by the core network device to transmit the first service to the first access network device.

In some possible implementations, the transceiving unit is further configured to send seventh indication information to the core network device or the first access network device, and the seventh indication information is used to indicate the fourth data packet, so The fourth data packet is the last of the first service transmitted by the device to the first access network device before the first access network device or the device switches the first transmission mode data pack.

In some possible implementation manners, the transceiving unit is further configured to receive response information of the fifth indication information from the first access network device, where the response information is used to instruct the first access network device to switch The transmission mode of the first service is the first transmission mode.

In some possible implementations, the transceiving unit is further configured to send fourth indication information to the first access network device, and the fourth indication information is used to indicate at least one of the following: the first access network device Send the time domain resource and/or frequency domain resource of the third data packet of the first service to the terminal device; processing information of the third data packet.

In a ninth aspect, a data transmission device is provided, for example, the device is the first communication device as described above. The device is used to execute the foregoing fourth aspect or any possible implementation method of the fourth aspect. Specifically, the device may include a unit for executing the fourth aspect or the method in any possible implementation manner of the fourth aspect.

In some possible implementation manners, the apparatus includes a receiving unit configured to receive fifth indication information from the second access network device, where the fifth indication information is used to indicate that the transmission mode of the first service is switched to the first Transmission mode, the first transmission mode includes multicast or unicast.

In some possible implementation manners, the apparatus further includes a sending unit, configured to send sixth indication information to the core network device, where the sixth indication information is used to instruct the core network device to activate or deactivate the first transmission channel , The first transmission channel is used by the core network device to transmit the first service to the device.

In some possible implementation manners, the receiving unit is further configured to receive seventh indication information from the second access network device, where the seventh indication information is used to indicate a fourth data packet, and the fourth data packet is Before the device or the second access network device switches the first transmission mode, the last data packet of the first service transmitted by the second access network device to the device.

In some possible implementation manners, the sending unit is further configured to send eighth indication information to a core network device, where the eighth indication information is used to indicate a fifth data packet, and the fifth data packet is used in the apparatus Or after the second access network device is switched to the first transmission mode, the core network device transmits the first data packet of the first service to the apparatus.

In some possible implementation manners, the receiving unit is further configured to receive fourth indication information from the second access network device, where the fourth indication information is used to indicate at least one of the following: the apparatus sends all the information to the terminal device. Time domain resources and/or frequency domain resources of the third data packet of the first service; processing information of the third data packet; and sending the third data packet to the terminal device according to the fourth instruction information.

In a tenth aspect, a data transmission device is provided, for example, the device is the aforementioned third communication device. The device is configured to execute the above-mentioned fifth aspect or any possible implementation method of the fifth aspect. Specifically, the device may include a unit for executing the fifth aspect or the method in any possible implementation manner of the fifth aspect.

In some possible implementation manners, the apparatus includes a transceiving unit and a processing unit, wherein the transceiving unit is configured to receive first indication information from a first access network device or a second access network device, and the first The indication information is used to instruct the core network device to activate or deactivate a first transmission channel, where the first transmission channel is used by the core network device to transmit the first service to the first access network device; the processing unit It is used to activate or deactivate the first transmission channel according to the first indication information.

In some possible implementation manners, the transceiving unit is further configured to receive second indication information sent by the first access network device, where the second indication information is used to indicate a first data packet, and the first data The packet is the first data packet of the first service transmitted by the apparatus to the first access network device after the first access network device is switched to the first transmission mode, and the first transmission The model includes multicast or unicast; the transceiver unit is further configured to send the first data packet to the first access network device through the first transmission channel according to the second indication information.

In some possible implementation manners, the transceiving unit is further configured to receive seventh indication information sent by the second access network device, where the seventh indication information is used to indicate a fourth data packet, and the fourth data packet Before the first access network device or the second access network device switches the first transmission mode, the second access network device transmits the first access network device to the first access network device The last data packet of a business;

The transceiving unit is further configured to send a fifth data packet to the first access network device through the first transmission channel according to the seventh indication information, where the fifth data packet is used in the first access network device. After the network device or the second access network device is switched to the first transmission mode, the device transmits the first data packet of the first service to the first access network device, and the first transmission Modes include multicast or unicast.

In an eleventh aspect, a communication device is provided, for example, the communication device is the first communication device as described above. The device includes a communication interface and at least one processor, and the communication interface is connected to the at least one processor, and is used to implement the method described in the first aspect or various possible designs of the first aspect. Exemplarily, the communication device is a chip provided in a communication device. Exemplarily, the communication device is an access network device.

Wherein, the communication interface is used to obtain a program or instruction, and the processor causes the first communication device to execute the first aspect or the method in any one of the possible implementation manners of the first aspect by running the program or instruction . The communication interface may be a transceiver in the access network equipment, for example, implemented by the antenna, feeder, and codec in the communication device, or if the first type of communication device is a chip set in the access network equipment , The communication interface can be the input/output interface of the chip, such as input/output pins. The processor can be a single semiconductor chip, or it can be integrated with other circuits to form a semiconductor chip. For example, it can be combined with other circuits (such as codec circuits, hardware acceleration circuits, or various bus and interface circuits) to form an SoC, or It can also be integrated into the ASIC as a built-in processor of an ASIC, and the ASIC integrated with the processor can be packaged separately or together with other circuits. In addition to the core used to execute software instructions to perform operations or processing, the processor may further include necessary hardware accelerators, such as FPGAs, PLDs, or logic circuits that implement dedicated logic operations.

Optionally, the device may further include a memory coupled with the processor.

In a twelfth aspect, a communication device is provided, for example, the communication device is the second communication device as described above. The device includes a communication interface and at least one processor, and the communication interface is connected to the at least one processor, and is used to implement the foregoing second aspect or the methods described in various possible designs of the second aspect. Exemplarily, the communication device is a chip provided in a communication device. Exemplarily, the communication device is an access network device.

Wherein, the communication interface is used to obtain a program or instruction, and the processor causes the first communication device to execute the second aspect or the method in any one of the possible implementation manners of the second aspect by running the program or instruction . The communication interface may be a transceiver in the access network equipment, for example, implemented by the antenna, feeder, and codec in the communication device, or if the first type of communication device is a chip set in the access network equipment , The communication interface can be the input/output interface of the chip, such as input/output pins. The processor can be a single semiconductor chip, or it can be integrated with other circuits to form a semiconductor chip. For example, it can be combined with other circuits (such as codec circuits, hardware acceleration circuits, or various bus and interface circuits) to form an SoC, or It can also be integrated into the ASIC as a built-in processor of an ASIC, and the ASIC integrated with the processor can be packaged separately or together with other circuits. In addition to the core used to execute software instructions to perform operations or processing, the processor may further include necessary hardware accelerators, such as FPGAs, PLDs, or logic circuits that implement dedicated logic operations.

Optionally, the device may further include a memory coupled with the processor.

In a thirteenth aspect, a communication device is provided, for example, the communication device is the second communication device as described above. The device includes a communication interface and at least one processor, and the communication interface is connected to the at least one processor, and is used to implement the method described in the third aspect or various possible designs of the third aspect. Exemplarily, the communication device is a chip provided in a communication device. Exemplarily, the communication device is an access network device.

Wherein, the communication interface is used to obtain a program or instruction, and the processor causes the first communication device to execute the third aspect or the method in any one of the possible implementation manners of the third aspect by running the program or instruction . The communication interface may be a transceiver in the access network equipment, for example, implemented by the antenna, feeder, and codec in the communication device, or if the first type of communication device is a chip set in the access network equipment , The communication interface can be the input/output interface of the chip, such as input/output pins. The processor can be a single semiconductor chip, or it can be integrated with other circuits to form a semiconductor chip. For example, it can be combined with other circuits (such as codec circuits, hardware acceleration circuits, or various bus and interface circuits) to form an SoC, or It can also be integrated into the ASIC as a built-in processor of an ASIC, and the ASIC integrated with the processor can be packaged separately or together with other circuits. In addition to the core used to execute software instructions to perform operations or processing, the processor may further include necessary hardware accelerators, such as FPGAs, PLDs, or logic circuits that implement dedicated logic operations.

Optionally, the device may further include a memory coupled with the processor.

In a fourteenth aspect, a communication device is provided, for example, the communication device is the first communication device as described above. The device includes a communication interface and at least one processor, and the communication interface is connected to the at least one processor, and is used to implement the methods described in the fourth aspect or various possible designs of the fourth aspect. Exemplarily, the communication device is a chip provided in a communication device. Exemplarily, the communication device is an access network device.

The communication interface is used to obtain a program or instruction, and the processor causes the first communication device to execute the fourth aspect or the method in any one of the possible implementation manners of the fourth aspect by running the program or instruction . The communication interface may be a transceiver in the access network equipment, for example, implemented by the antenna, feeder, and codec in the communication device, or if the first type of communication device is a chip set in the access network equipment , The communication interface can be the input/output interface of the chip, such as input/output pins. The processor can be a single semiconductor chip, or it can be integrated with other circuits to form a semiconductor chip. For example, it can be combined with other circuits (such as codec circuits, hardware acceleration circuits, or various bus and interface circuits) to form an SoC, or It can also be integrated into the ASIC as a built-in processor of an ASIC, and the ASIC integrated with the processor can be packaged separately or together with other circuits. In addition to the core used to execute software instructions to perform operations or processing, the processor may further include necessary hardware accelerators, such as FPGAs, PLDs, or logic circuits that implement dedicated logic operations.

Optionally, the device may further include a memory coupled with the processor.

In a fifteenth aspect, a communication device is provided, for example, the communication device is the third communication device as described above. The device includes a communication interface and at least one processor, and the communication interface is connected to the at least one processor, and is used to implement the method described in the fifth aspect or various possible designs of the fifth aspect. Exemplarily, the communication device is a chip provided in a communication device. Exemplarily, the communication device is a core network device.

Wherein, the communication interface is used to obtain a program or instruction, and the processor causes the first type of communication device to execute the above-mentioned fifth aspect or the method in any one of the possible implementation manners of the fifth aspect by running the program or instruction . The communication interface may be a transceiver in the access network equipment, for example, implemented by the antenna, feeder, and codec in the communication device, or, if the first type of communication device is a chip set in the core network equipment, The communication interface may be the input/output interface of the chip, such as input/output pins. The processor can be a single semiconductor chip, or it can be integrated with other circuits to form a semiconductor chip. For example, it can be combined with other circuits (such as codec circuits, hardware acceleration circuits, or various bus and interface circuits) to form an SoC, or It can also be integrated into the ASIC as a built-in processor of an ASIC, and the ASIC integrated with the processor can be packaged separately or together with other circuits. In addition to the core used to execute software instructions to perform operations or processing, the processor may further include necessary hardware accelerators, such as FPGAs, PLDs, or logic circuits that implement dedicated logic operations.

In a sixteenth aspect, this application provides a data transmission system, which includes at least two of the device provided in the sixth aspect, the device provided in the seventh aspect, and the device provided in the tenth aspect; or

The system includes at least two of the device provided in the eighth aspect, the device provided in the ninth aspect, and the device provided in the tenth aspect; or

The system includes at least two of the devices provided in the eleventh aspect, the devices provided in the twelfth aspect, and the devices provided in the fifteenth aspect;

The system includes at least two of the devices provided in the thirteenth aspect, the devices provided in the fourteenth aspect, and the devices provided in the fifteenth aspect.

In a seventeenth aspect, a computer-readable storage medium is provided, and a computer program (also referred to as an instruction or code) for implementing the method in the first aspect is stored thereon.

For example, when the computer program is executed by a computer, the computer can execute the method in the first aspect. The computer may be a communication device.

In an eighteenth aspect, a computer-readable storage medium is provided, and a computer program (also referred to as an instruction or code) for implementing the method in the second aspect is stored thereon.

For example, when the computer program is executed by a computer, the computer can execute the method in the second aspect. The computer may be a communication device.

In a nineteenth aspect, a computer-readable storage medium is provided, on which a computer program (also referred to as an instruction or code) for implementing the method in the third aspect is stored.

For example, when the computer program is executed by a computer, the computer can execute the method in the third aspect. The computer may be a communication device.

In a twentieth aspect, a computer-readable storage medium is provided, and a computer program (also referred to as an instruction or code) for implementing the method in the fourth aspect is stored thereon.

For example, when the computer program is executed by a computer, the computer can execute the method in the fourth aspect. The computer may be a communication device.

In a twenty-first aspect, a computer-readable storage medium is provided, on which a computer program (also referred to as an instruction or code) for implementing the method in the fifth aspect is stored.

For example, when the computer program is executed by a computer, the computer can execute the method in the fifth aspect. The computer may be a communication device.

In the twenty-second aspect, this application provides a chip including a processor and a communication interface. The processor is coupled with the communication interface, and is configured to implement the method provided in the first aspect or any one of the optional implementation manners.

Optionally, the chip further includes a memory, and the memory and the processor are connected to the memory through a circuit or a wire.

In the twenty-third aspect, this application provides a chip including a processor and a communication interface. The processor is coupled with the communication interface, and is configured to implement the method provided in the second aspect or any one of the optional implementation manners. Optionally, the chip further includes a memory, and the memory and the processor are connected to the memory through a circuit or a wire.

In a twenty-fourth aspect, this application provides a chip including a processor and a communication interface. The processor is coupled with the communication interface, and is configured to implement the method provided in the third aspect or any one of the optional implementation manners. Optionally, the chip further includes a memory, and the memory and the processor are connected to the memory through a circuit or a wire.

In the twenty-fifth aspect, this application provides a chip including a processor and a communication interface. The processor is coupled with the communication interface, and is configured to implement the method provided in the fourth aspect or any one of the optional implementation manners.

In the twenty-sixth aspect, the present application provides a chip including a processor and a communication interface. The processor is coupled with the communication interface, and is configured to implement the method provided in the fifth aspect or any one of the optional implementation manners. Optionally, the chip further includes a memory, and the memory and the processor are connected to the memory through a circuit or a wire.

In the twenty-seventh aspect, the present application provides a computer program product. The computer program product includes a computer program (also referred to as an instruction or code). When the computer program is executed by a computer, the computer realizes the Methods. The computer may be a communication device.

In the twenty-eighth aspect, the present application provides a computer program product. The computer program product includes a computer program (also referred to as an instruction or code). When the computer program is executed by a computer, the computer realizes the second aspect Methods. The computer may be a communication device.

In the twenty-ninth aspect, the present application provides a computer program product. The computer program product includes a computer program (also referred to as an instruction or code). When the computer program is executed by a computer, the computer realizes the third aspect Methods. The computer may be a communication device.

In the thirtieth aspect, the present application provides a computer program product. The computer program product includes a computer program (also referred to as an instruction or code). When the computer program is executed by a computer, the computer realizes the method. The computer may be a communication device.

In the thirty-first aspect, the present application provides a computer program product, the computer program product includes a computer program (also called instructions or code), when the computer program is executed by a computer, the computer realizes the fifth aspect Methods. The computer may be a communication device.

Description of the drawings

FIG. 1 is a schematic diagram of an application scenario of a data transmission method provided in an embodiment of the present application.

Fig. 2 is a schematic diagram of an MBSFN transmission method provided by an embodiment of the present application.

Fig. 3 is a schematic diagram of a data transmission method provided by an embodiment of the present application.

Fig. 4 is a schematic diagram of a handover process in the prior art.

Figures 5 to 10 are schematic diagrams of data transmission methods provided by embodiments of the present application.

Figures 11-13 are schematic block diagrams of data transmission devices provided by embodiments of the present application.

Detailed ways

The technical solutions of the embodiments of this application can be applied to various communication systems, such as: global system for mobile communications (GSM) system, code division multiple access (CDMA) system, broadband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE Time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, the future fifth generation (5th generation, 5G) system or new radio (NR), etc.

Terminal devices include devices that provide users with voice and/or data connectivity. Specifically, they include devices that provide users with voice, or include devices that provide users with data connectivity, or include devices that provide users with voice and data connectivity. equipment. For example, it may include a handheld device with a wireless connection function, or a processing device connected to a wireless modem. The terminal equipment can communicate with core network equipment via a radio access network (RAN), exchange voice or data with the RAN, or exchange voice and data with the RAN. The terminal equipment may include user equipment (UE), wireless terminal equipment, mobile terminal equipment, device-to-device communication (device-to-device, D2D) terminal equipment, vehicle to everything (V2X) terminal equipment , Machine-to-machine/machine-type communications (M2M/MTC) terminal equipment, Internet of things (IoT) terminal equipment, subscriber unit, subscriber station (subscriber) station), mobile station (mobile station), remote station (remote station), access point (access point, AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user Agent (user agent), or user equipment (user device), etc. For example, it may include mobile phones (or "cellular" phones), computers with mobile terminal equipment, portable, pocket-sized, hand-held, mobile devices with built-in computers, and so on. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants, PDA) and other equipment. It also includes restricted devices, such as devices with low power consumption, or devices with limited storage capabilities, or devices with limited computing capabilities. Examples include barcodes, radio frequency identification (RFID), sensors, global positioning system (GPS), laser scanners and other information sensing equipment.

As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices or smart wearable devices, etc. It is a general term for using wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes Wait. A wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a kind of hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.

The various terminal devices described above, if they are located on the vehicle (for example, placed in the vehicle or installed in the vehicle), can be regarded as vehicle-mounted terminal equipment, for example, the vehicle-mounted terminal equipment is also called on-board unit (OBU). ).

In the embodiment of the present application, the terminal device may also include a relay. Or it can be understood that everything that can communicate with the base station can be regarded as a terminal device.

In the embodiments of the present application, the device for realizing the function of the terminal device may be a terminal device, or a device capable of supporting the terminal device to realize the function, such as a chip system, and the device may be installed in the terminal device. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices. In the technical solutions provided in the embodiments of the present application, the device used to implement the functions of the terminal is a terminal device as an example to describe the technical solutions provided in the embodiments of the present application.

The access network device in the embodiment of the present application may be a device capable of providing a random access function for a terminal device or a chip that can be installed in the device. This equipment includes but is not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC) , Base transceiver station (base transceiver station, BTS), home base station (home evolved NodeB, or home Node B, HNB), baseband unit (baseband unit, BBU), wireless fidelity (wireless fidelity, WIFI) system access Point (access point, AP), wireless relay node, wireless backhaul node, transmission point (transmission point, TP) or transmission and reception point (transmission and reception point, TRP), etc., can also be the fifth generation (the fifth generation) , 5G) system, for example, the gNB or transmission point (TRP or TP) in the new radio (NR), one or a group of (including multiple antenna panels) antenna panels of the base station in the 5G system, or It may be a network node that constitutes a gNB or a transmission point, such as a baseband unit (BBU) or a distributed unit (DU).

In some deployments, the gNB may include a centralized unit (CU) and a distributed unit (DU). The gNB may also include an active antenna unit (AAU). The CU implements some of the functions of the gNB, and the DU implements some of the functions of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, and implements radio resource control (radio resource control, RRC) and packet data convergence protocol (packet data convergence protocol, PDCP) layer functions. The DU is responsible for processing the physical layer protocol and real-time services, and realizes the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer. AAU realizes some physical layer processing functions, radio frequency processing and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by the DU , Or, sent by DU+AAU. It can be understood that the network device may be a device that includes one or more of a CU node, a DU node, and an AAU node. In addition, the CU can be divided into network equipment in an access network (radio access network, RAN), and the CU can also be divided into network equipment in a core network (core network, CN), which is not limited in this application.

The core network device is used to send downlink data to the access network device or receive uplink data sent by the access network device, and the core network device has a function of controlling the access network device. Optionally, the core network device in the embodiment of the present application corresponds to different devices in different systems. For example, in the third generation (3G) communication system, the service support node (serving GPRS support node, SGSN) and/or the gateway support node (SGSN) of the general packet radio service (GPRS) and/or GPRS gateway support node ( gateway GPRS Support Node, GGSN; In the fourth generation (4G) communication system, it can correspond to mobility management entity (MME) and/or serving gateway (S-GW); in 5G communication The system can correspond to unified data storage (unified data repository, UDR), unified data management (unified data management, UDM), network data analysis function (network data analysis function, NWDAF), network warehouse function (network repository function, NRF), Network slice selection function (NSSF) network element, session management function network element (session management function, SMF), user plane function network element (user plane function, UPF), core network access and mobility management functions One or more of (core access and mobility management function, AMF) and policy control function (PCF) network elements; in the future 6G communication system or other communication systems, the core network equipment can correspond to other The webpage embodiment of this application does not specifically limit this.

Referring to Fig. 1, Fig. 1 shows a schematic diagram of an application scenario of an embodiment of the present application. The communication system in FIG. 1 may include at least one terminal device (for example, terminal device 10, terminal device 20, terminal device 30, terminal device 40, terminal device 50, and terminal device 60), access network device 70, and core network device 80. The access network device 70 is used to provide communication services for the terminal device and access the core network device 80. The terminal device can access the network by searching for synchronization signals, broadcast signals, etc. sent by the access network device 70, so as to communicate with the network. The terminal device 10, the terminal device 20, the terminal device 30, the terminal device 40, and the terminal device 60 in FIG. 1 can perform uplink and downlink transmissions with the access network device 70. For example, the access network device 70 can send downlink signals to the terminal device 10, the terminal device 20, the terminal device 30, the terminal device 40, and the terminal device 60 in a unicast or multicast manner, and can also receive the terminal device 10 and the terminal device 20. , Terminal equipment 30, terminal equipment 40 and terminal equipment 60 sent uplink signals.

In addition, the terminal device 40, the terminal device 50, and the terminal device 60 can also be regarded as a communication system. The terminal device 60 can send downlink signals to the terminal device 40 and the terminal device 50, and can also receive uplink signals sent by the terminal device 40 and the terminal device 50. Signal.

The core network device 80 is configured to send downlink data to the access network device 70 or receive uplink data sent by the access network device 70.

It should be noted that the embodiments of the present application may be applied to a communication system including one or more access network devices, and may also be applied to a communication system including one or more terminal devices, which is not limited in this application.

In downlink transmission, the access network device 70 in FIG. 1 may send data to the aforementioned terminal device in a multicast manner. Or the access network device 70 in FIG. 1 may send data to the aforementioned terminal device in a unicast manner. In the existing communication system, the access network request device can transmit the same data to multiple terminal devices simultaneously through multicast or multicast transmission method point-to-multipoint, or it can transmit the same data to each terminal device separately through unicast transmission method. The device transmits data separately. The transmission method of using multicast or multicast to transmit data is relatively static. After the transmission method is configured, it will always be transmitted according to the configured method, and the multicast transmission method cannot be changed dynamically. However, with the change of application scenarios and the emergence of diversified requirements, if the transmission is always carried out according to the configured transmission mode, the flexibility is poor and the communication needs cannot be met. How to flexibly and dynamically change the multicast transmission mode is an urgent need to solve problem.

In order to facilitate the understanding of the embodiments of the present application, some terms of the embodiments of the present application are explained below to facilitate the understanding by those skilled in the art.

1) Multicast transmission technology, which can also be referred to as MBMS technology, or multicast transmission mode, refers to a technology in which a certain service sends data to multiple terminal devices at the same time through an access network device. When the multicast technology is used for transmission, for the same data, multiple terminal devices simultaneously receive the same data during the transmission process of the access network device (for example, the base station). Currently, multicast transmission technologies are mainly divided into two types: multimedia broadcast multicast multicast service single frequency network (MBSFN) and single cell point to multipoint service (single cell point to multipoint, SC-PTM). Among them, the SC-PTM mode means that the MBMS service is only transmitted through one cell (for example, a base station), and a network device performs group scheduling on multiple terminal devices at the same time. MBSFN transmission means that multiple synchronized cells send the same data to the terminal device on the same time-frequency resource. One terminal device can receive multiple copies of the same data after superimposition, which can improve the signal reception strength and eliminate inter-cell Interference. Take two access network devices as an example to describe. Specifically, access network device 1 is a control node, and access network device 1 can process the data packet received from the core network device and copy it into two copies of data, one of which is The data is sent to at least one terminal device by multicast according to the first time-frequency resource, and the remaining data is sent to the access network device 2, and the access network device 2 sends the data through the multicast according to the first time-frequency resource. To at least one terminal device. The access network device 1 may send the indication information indicating the first time-frequency resource to the access network device 2 together with the remaining piece of data, or may also send it to the access network device 2 respectively. Of course, the indication information of the first time-frequency resource may also come from other devices, which is not limited in this application.

As shown in Figure 2, a schematic diagram of MBSFN transmission is shown. An MBMS service area can include one or more MBSFN areas. Figure 2 shows that it includes 3 MBSFN areas. The terminal device can receive data according to the configured subset of MBSFN. For example, the terminal device can determine that the MBMS data that needs to be received will be received from When the configured MBSFN area in the middle of FIG. 2 is sent, the terminal device receives the data sent in the middle MBSFN area. An MBSFN area is composed of multiple cells, and some or all of the multiple cells can coordinate to realize MBSFN transmission. FIG. 2 shows the base stations to which three cells that are bolded for coordination and implementation of MBSFN transmission belong, for example, three base stations that are bolded correspond to three cells. On a specific frequency, 3 cells can send the same data to the terminal device on the same time-frequency resources, and the cells corresponding to the remaining 4 base stations can be called MBSFN area reserved cells, which may not be used for MBSFN Transmission for other services. In the time-frequency resources for MBSFN transmission, the transmission power of the MBSFN reserved cell needs to be restricted to reduce the interference to MBSFN transmission.

In addition, the multicast transmission technology can also be an extension of the SC-PTM technology, such as extending from single cell point to multipoint transmission to multi-cell point to multipoint transmission (single cell point to multipoint, MC-PTM), that is, use Similar to SC-PTM technology, but no longer restricts the multicast transmission technology within a single cell. The multicast transmission technology involved in the embodiments of this application is not limited to the existing multicast transmission technology, and may also include the multicast transmission technology based on the evolution of the existing multicast transmission technology in the subsequent NR research and the newly designed multicast transmission technology In other words, the embodiments of the present application focus on the procedures involved in switching between the multicast transmission mode and the unicast transmission mode, and are not limited to specific multicast transmission technologies.

2) The use of multicast transmission means: when a certain access network device sends the transport block (TB) corresponding to the protocol data unit (protocol data unit, PDU), it uses the packet wireless network temporary identification (group radio network temporary identifier, G-RNTI) scrambles the PDU, or scrambles the downlink control information (DCI) corresponding to the PDU, and at the same time, there are one or more terminal devices based on the same G-RNTI Receiving the same PDU; or using multicast to transmit PDUs can mean telling multiple terminal devices the location of the same PDU in a semi-static manner, and multiple terminal devices can receive the PDU at the same time; or using multicast to transmit PDUs It can mean that the PDU is transmitted in a radio bearer established for multicast transmission or transmitted in a channel specially designed for multicast.

Receiving by multicast transmission means that when sending by multicast, one of the multiple terminal devices receives the PDU according to G-RNTI; or one of the multiple terminal devices receives the PDU according to the G-RNTI; The radio bearer established by the multicast transmission receives or receives PDUs on the channel used for the multicast transmission.

In this application, multicast is a specific method of multicast, therefore, multicast may also be referred to as multicast.

3). Sending by unicast transmission means: when a certain access network device sends the TB corresponding to the PDU, it uses the cell network temporary identifier (C-RNTI) to scramble the PDU , Or scramble the DCI corresponding to the PDU, and only one terminal device receives the same PDU according to the C-RNTI; or the unicast transmission of the PDU can mean that the PDU is transmitted in the radio bearer established for unicast transmission or Transmission is carried out in a channel specially designed for unicast.

Receiving by unicast transmission means that when unicast transmission is used, a terminal device receives PDUs according to C-RNTI; or a terminal device receives the PDU through the radio bearer established for unicast transmission or when it is used for unicast transmission. Receive on the channel.

The access network equipment and terminal equipment that communicate with each other have a certain protocol layer structure. For example, the control plane protocol layer structure may include the functions of the protocol layers such as the RRC layer, the PDCP layer, the RLC layer, the MAC layer, and the physical layer. The user plane protocol layer structure may include the functions of the PDCP layer, the RLC layer, the MAC layer, and the physical layer. In an implementation, the PDCP layer may also include a service data adaptation protocol (SDAP) layer.

The functions of these protocol layers may be implemented by one node, or may be implemented by multiple nodes; for example, in an evolution structure, an access network device may include a CU and a DU, and multiple DUs may be centrally controlled by a CU. CU and DU can be divided according to the protocol layer of the wireless network. For example, the functions of the PDCP layer and above are set in the CU, the protocol layers below the PDCP, and the functions of the RLC layer and MAC layer are set in the DU.

It should be understood that this division of protocol layers is just an example, and it can also be divided in other protocol layers, for example, in the RLC layer. The functions of the RLC layer and above protocol layers are set in the CU, and the protocol layers below the RLC layer The functions are set in the DU; or, divided in a certain protocol layer, for example, part of the functions of the RLC layer and the functions of the protocol layer above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the functions of the protocol layer below the RLC layer Set in DU. In addition, it can also be divided in other ways, for example, by time delay. The functions that need to meet the time delay requirement for processing time are set in the DU, and the functions that do not need to meet the time delay requirement are set in the CU.

The data transmission method 300 provided by an embodiment of the present application will be described below with reference to the accompanying drawings.

S310: The first access network device determines mode switching request information, where the mode switching request information is used to request to switch the transmission mode of the first service to the first transmission mode, and the first transmission mode includes multicast or unicast.

That is to say, the first access network device can request to switch to unicast transmission or multicast transmission through the mode switching request information, thereby realizing flexible switching of transmission modes, where the first transmission mode is an example for simplifying the explanation. Note, it is not limited to a specific transmission mode.

It can be understood that the multicast and multicast transmission modes can be equivalent; the unicast and unicast transmission modes can be equivalent.

Optionally, the data packet constituting the first service may be at least one data packet.

Optionally, if the first service is transmitted in a multicast transmission mode, the first service may also become a multicast service, and the multicast service may be a multimedia broadcast multicast service (MBMS). The multicast transmission method may include MBSFN transmission or SC-PTM transmission or MC-PTM transmission.

The first access network device may send mode switching request information to the second access network device, including but not limited to the following three situations:

Case 1: When the first access network device obtains the measurement result through the terminal device and determines that the transmission mode switching needs to be performed according to the quality result, the first access network device determines to send the mode switching request information to the second access network device.

Case 2: When the first access network device receives request information from the terminal device, and the request information is used to request the first access network device to perform transmission mode switching, the first access network device determines to transfer to the second access network device. The device sends a mode switching request message.

Case 3: When the first access network device receives the transmission mode switching instruction information from the core network device, the first access network device determines to send the mode switching request information to the second access network device.

S320: The first access network device sends mode switching request information to the second access network device, and the second access network device receives the mode switching request information from the first access network device.

It can be understood that, in any case, the first access network device may send mode switching request information to the second access network device. Including but not limited to the following scenarios:

When the transmission mode of the first access network device is the first transmission mode, the first access network device sends mode switching request information to the second access network device. For example, when the first access network device communicates in unicast, it may request the second access network device to switch to multicast transmission.

When the current transmission mode of the first access network device is turned off, the first access network device sends mode switching request information to the second access network device. The mode switching request information is used to indicate that the current transmission mode enters the off state, that is, it is not used. Transfer data in any transfer mode.

When the transmission mode of the first access network device is switched to the first transmission mode, the first access network device sends mode switching request information to the second access network device.

S330: The second access network device sends response information of the mode switching request information to the first access network device, and the first access network device receives the response information of the mode switching request information from the second access network device.

In a possible implementation manner, the mode switching request information is used to request the first access network device to switch the transmission mode of the first service to the first transmission mode. Correspondingly, the response information of the mode switching request information indicates whether the second access network device accepts the first access network device to switch the transmission mode of the first service to the first transmission mode. It is understandable that, at this time, the second access network device may be the master control node of the first access network device. If the response information of the mode switching request information indicates that the second access network device accepts the first access network device to switch the transmission mode of the first service to the first transmission mode, the second access network device cooperates with the first access device to perform the first transmission mode. The transmission mode of a service is switched to the first transmission mode. If the response information of the mode switching request information indicates that the second access network device does not accept the first access network device to switch the transmission mode of the first service to the first transmission mode, optionally, the response information of the mode switching request information may carry no Reason for acceptance. Optionally, if the second access network device is temporarily unable to accept that the first access network device switches the transmission mode of the first service to the first transmission mode, the response information of the mode switching request information may instruct the first access network device to switch The switching time of the first transmission mode, specifically, the first access network device may switch the transmission mode of the first service to the first transmission mode after the first time length, for example, the first time length is 10 ms.

In another possible implementation manner, the mode switching request information is used to request the second access network device to switch the transmission mode of the first service to the first transmission mode. Correspondingly, the response information of the mode switching request information indicates whether the second access network device itself switches the transmission mode of the first service to the first transmission mode. If the response information of the mode switching request information indicates that the second access network device accepts itself to switch the transmission mode of the first service to the first transmission mode, the second access network device switches the transmission mode of the first service to the first transmission mode.

In method 300, the mode switching request information can be carried in a new message or in any message in the existing process. For example, in the switching scenario of FIG. 4, the mode switching request information can be carried in the figure. In the handover request message of 4 or carried in the confirmation message of the handover request message in FIG. 4. The response information of the mode switching request information can be carried in a new message or in any message in the existing process. For example, in a switching scenario, the mode switching request information can be carried in the switching request message in Figure 4 In the response message.

Therefore, in the data transmission method provided above, the first access network device can send mode switching request information to the second access network device, so that the first access network device or the second access network device can switch the first service The transmission mode of is the first transmission mode, which can flexibly switch the transmission mode according to diversified communication requirements, thereby improving transmission efficiency.

In the following, the method 500 for transmitting data will be described with reference to FIG. 5 taking the first transmission mode as unicast and the current transmission mode of the first access network device as MBSFN transmission as an example. Method 500 includes:

S510: The first access network device determines mode switching request information, where the mode switching request information is used to request to switch the transmission mode of the first service of the first access network device to unicast.

The scenarios in which the first access network device performs S520 include but are not limited to the following three scenarios:

S520: The first access network device sends mode switching request information to the second access network device, and the second access network device receives the mode switching request information from the first access network device.

Optionally, if the first access network device and the second access network device are performing MBSFN transmission, the second access network device may disconnect the MBSFN for performing MBSFN with the first access network device after receiving the mode switching request information. Transmission connection, at this time, the second access network device may be the control node of the first access network device.

Optionally, if there is S570, after S570, the second access network device may disconnect the connection used for MBSFN transmission with the first access network device.

S530: The first access network device sends first indication information to the core network device, and the core network device receives first indication information from the first access network device. The first indication information instructs the core network device to activate the first transmission channel. A transmission channel is used for the core network device to transmit the first service to the first access network device.

The foregoing first transmission channel may be the transmission path of the PDU session (session) between the core network device and the first access network device, the transmission path of the QoS flow, the transmission path of the GTP tunnel, or the transmission of other types of services. path. Or the foregoing first indication information may instruct the core network device to establish the first transmission channel. In other words, the function of the first indication information is to enable the core network device to normally transmit the first service whether it is the newly established first transmission channel or the activated first transmission channel.

S540: Activate the first transmission channel according to the first indication information.

It can be understood that the data packet of the first service sent by the first access network device to the terminal device through unicast originates from the first transmission channel.

S550. The first access network device sends second indication information to the core network device, and the core network device receives second indication information from the first access network device, where the second indication information is used to indicate the first data packet and the first data The package is the first service transmitted by the core network device to the first access network device after the first access network device switches the transmission mode of the first service to the first transmission mode or after the core network device activates the first transmission channel The first packet.

Specifically, when the first access network device is performing MBSFN transmission, it determines the last data packet of the first service for MBSFN transmission, and the sequence number of the last data packet is X. When the first access network device performs S520 After that, the first access network device determines that the sequence number of the first data packet of the first service to be unicast transmission is X+1, that is, the first sequence number of the first data packet is X+1. In this way, the continuity of the data packets of the first service can be guaranteed, and the loss of the data packets can be avoided, thereby improving the transmission efficiency.

Optionally, the second indication information includes a first sequence number (sequence number, SN), and the first sequence number is used to indicate the sequence of the first data packet in at least one data packet of the first service. The sequence number of each data packet in at least one data packet of the first service is uniformly configured by the core network device. In other words, the sequence of at least one data packet of the first service is uniformly configured by the core network device or the data server.

Specifically, the header of each data packet may include a sequence number, and the sequence number is used to indicate the sequence of the corresponding data packet in at least one data packet of the first service. For example, the first sequence number is the first data packet. The sequence number (SN) in the GTP-U packet header of the packet. In a possible implementation, the first sequence number is dedicated to indicating the sequence of the first data packet. For example, the first sequence number is indicated by a sequence number field in a message, and the sequence number field is The newly added field or the sequence number field reuses reserved fields or bits.

S560: The core network device sends the first data packet to the first access network device through the first transmission channel. Optionally, the core network device may continue to send data packets after the first data packet after sending the first data packet.

It should be noted that S530 and S550 can be carried in one message, and can also be carried in different messages and sent at the same time, or sent in a sequential order, which is not limited in this embodiment of the application.

Optionally, the method 500 further includes: step S570. After S520, the second access network device sends third indication information to the first access network device, the third indication information indicates the second data packet, and the second data packet is Before the first access network device switches the transmission mode of the first service to the first transmission mode, the second access network device transmits the last data packet of the first service to the first access network device.

If S570 exists, S550 includes: after receiving the third instruction information from the second access network device, the first access network device sends second instruction information to the core network device according to the third instruction information. In other words, S550 includes two implementation methods. The first method is that after the first access network device performs S520, it can determine the second instruction information by itself, and the second method is that after S570, execute according to the third instruction information in S570. S550. Optionally, the third indication information includes a second sequence number, and the second sequence number is used to indicate the sequence of the second data packet in the at least one data packet of the first service. The sequence number of each data packet in at least one data packet of the first service is uniformly configured by the core network device. In other words, the sequence of at least one data packet of the first service is uniformly configured by the core network device.

Specifically, when the first access network device and the second access network device are performing MBSFN transmission, after the second access network device receives the mode switching request information from the first access network device in S520, the second access network device The network access device determines the last data packet of the first service for MBSFN transmission, and the sequence number of the last data packet is X, that is, the second sequence number of the second data packet is X. The second access network device sends third indication information to the first access network device, and the third indication information indicates X. The first access network device determines, according to X indicated by the third indication information, that the sequence number of the first data packet of the first service to be unicast transmission is X+1, that is, the first sequence number of the first data packet is X +1, the sequence number of the first data packet indicated by the second indication information sent to the core network by the first access network device in S550 is X+1, and the sequence number sent by the core network device to the first access network device is The first data packet of X+1. In this way, the continuity of the data packets of the first service can be guaranteed, and the loss of the data packets can be avoided, thereby improving the transmission efficiency. If S570 exists, optionally, the third indication information may be response information of the mode switching request information in method 300; optionally, the third indication information may be response information independent of the mode switching request information in method 300, In this case, the method 500 may further include the second access network device sending response information of the mode switching request information to the first access network device.

Optionally, S510 and S520 and the response information of the second access network device sending the mode switching request information to the first access network device may exist as a separate embodiment, independent of S530-S580. In this way, in a scenario where the terminal device moves from the coverage area of the second access network device to the coverage area of the first access network device, the transmission mode of the first access network device can be switched to unicast transmission. Specifically, if the terminal device moves from the coverage area of the second access network device to the coverage area of the first access network device, the second access network device determines the access of the service terminal device according to the measurement report reported by the terminal device. The network device is switched to the first access network device, the second access network device can send a handover request message (such as the handover request message in Figure 4) to the first access network device, and the first access network device can send a handover request message to the second access network device. The network-connected device sends a confirmation message of the switching request message (such as the confirmation message of the switching request message in FIG. 4), and the confirmation message of the switching request message may include the mode switching request information in S520. Of course, the mode switching request information in S520 may also be carried in any message sent by the first access network device to the second access network device, which is not limited in the embodiment of the present application, which can save signaling overhead. Optionally, in the scenario of FIG. 4, after the second access network device receives the confirmation message of the handover request message, the handover command sent to the terminal device carries the transmission mode instructing the first access network device to switch the first service It is unicast instruction information, so that the terminal device can better receive the data sent by the first access network device. In addition, the second access network device may switch the transmission mode of the first service to unicast according to the first access network device, and decide to forward a data packet of a certain protocol layer to the first access network device, for example, it may forward RLC layer data Packet or PDCP layer data packet.

S580: The first access network device determines the processing mode of each protocol stack layer according to the scheduling situation of its own time-frequency resource, network load situation and channel quality condition of the received first data packet, and finally sends the processed data packet To the terminal equipment. Optionally, the first access network device determines the processing mode of each protocol stack according to its own time-frequency resource scheduling situation, network load situation, and channel quality conditions for the data packets after the first data packet received from the core device, Send the processed first data packet to the terminal device.

Therefore, in the method 500, the first access network device requests to switch the transmission mode of the first access network device to unicast by sending mode switching request information to the second access network device, so that the transmission from MBSFN to Switching of unicast transmission. In addition, the second indication information sent by the first access network device to the core network device can ensure the continuity of the first service, thereby improving transmission efficiency.

In the following, a method 600 for data transmission will be described with reference to FIG. 6 taking the first transmission mode as MBSFN transmission and the current transmission mode of the first access network device as unicast as an example. Method 600 includes:

S610: The first access network device determines mode switching request information, where the mode switching request information is used to request to switch the transmission mode of the first service of the first access network device to MBSFN transmission.

The scenarios in which the first access network device executes S620 include but are not limited to the following three scenarios:

S620: The first access network device sends mode switching request information to the second access network device, and the second access network device receives the mode switching request information from the first access network device.

Optionally, after receiving the mode switching request information, the second access network device establishes a connection with the first access network device for MBSFN transmission. In this case, the second access network device may be the device of the first access network device. The control node, of course, a device other than the second access network device may also be a control node of the first access network device. If the first access network device is currently performing unicast transmission, and if the data transmitted by the first access network device using the unicast transmission mode comes from the core network device, S630 is executed. If the data transmitted by the first access network device using unicast transmission comes from the forwarding of the second access network device, the second access network device will stop forwarding for unicast transmission after receiving the mode switching request information Packets. S630: The first access network device sends first indication information to the core network device, the core network device receives first indication information from the first access network device, and the first indication information instructs the core network device to deactivate the first transmission channel. The first transmission channel is used for the core network device to transmit the first service to the first access network device.

S640: The core network device deactivates the first transmission channel according to the first indication information.

For the first transmission channel, refer to the description in method 500.

S650: The second access network device sends fourth indication information to the first access network device, and the first access network device receives the fourth indication information from the second access network device. The fourth indication information is used to indicate at least one of the following: the time-frequency resource and/or frequency domain resource of the third data packet of the first service sent by the first access network device to the terminal device, and processing information of the third data packet.

The processing information of the third data packet includes at least one of the physical layer modulation mode, modulation order, modulation and coding strategy (modulation and coding scheme, MCS) and other parameters.

Optionally, the third data packet may be sent by the second access network device to the first access network device, or sent by other devices to the first access network device, which is not described in this embodiment of the application. limited.

In a possible implementation, the third data packet is sent by the second access network device to the first access network device. For example, the third data packet may be media access control (MAC) protocol data Unit (protocol data unit, PDU), in other words, if the first access network device switches the transmission mode of the first service to MBSFN, the second access network device can send packet data aggregation to the first access network device. The third data packet processed by the packet data convergence protocol (PDCP) layer, radio link control (RLC) layer, and media access control (MAC) layer.

It is understandable that the third data packet may be a data packet. At this time, the third data packet is for the first access network device to switch the transmission mode of the first service to MBSFN transmission. The first data packet sent by the connected device. The third data packet may also be multiple data packets. At this time, the third data packet is for the first access network device to switch the transmission mode of the first service to MBSFN transmission, and the second access network device sends the data to the first access network device. Multiple consecutive packets sent.

Optionally, the fourth indication information may be response information of the mode switching request information in method 300; optionally, the fourth indication information may be response information independent of the mode switching request information in method 300, in this case Next, the method 600 may further include the second access network device sending response information of the mode switching request information to the first access network device.

Optionally, S610 and S620 and the response information of the mode switching request information sent by the second access network device to the first access network device may exist as a separate embodiment, independent of S640 and S650 in the method 600. In this way, in a scenario where the terminal device moves from the coverage area of the second access network device to the coverage area of the first access network device, the transmission mode of the first access network device can be switched to MBSFN transmission. Specifically, if the terminal device moves from the coverage area of the second access network device to the coverage area of the first access network device, the second access network device determines the access of the service terminal device according to the measurement report reported by the terminal device. The network device is switched to the first access network device, the second access network device can send a handover request message (such as the handover request message in Figure 4) to the first access network device, and the first access network device can send a handover request message to the second access network device. The network-connected device sends a confirmation message of the handover request message (as shown in the confirmation message of the handover request message in FIG. 4), and the confirmation message of the handover request message may include the mode switch request information in S620. Of course, the mode switching request information in S620 may also be carried in any message sent by any first access network device to the second access network device, which is not limited in the embodiment of the present application, which can save signaling overhead. Optionally, in the scenario of FIG. 4, after the second access network device receives the confirmation message of the handover request message, the handover command sent to the terminal device carries the transmission mode instructing the first access network device to switch the first service The instruction information transmitted for MBSFN, so that the terminal device can better receive the data sent by the first access network device. In addition, the second access network device can switch the transmission mode of the first service to MBSFN transmission according to the first access network device to decide to forward a data packet of a certain protocol layer to the first access network device, for example, it can forward MAC layer data Bag.

It can be understood that there is no restriction on the order of S650 and S630, and S650 can be performed before or before S630 or at the same time.

S660: The first access network device sends a third data packet to the terminal device according to the fourth instruction information.

Specifically, S660 includes: the first access network device sends the third data packet to the terminal device according to the physical (physical, PHY) layer parameters of the first access network device according to the fourth indication information. For example, after the first access network device processes the third data packet at the physical layer, it sends the third data packet to the terminal device in the time domain resource and/or frequency domain resource indicated by the fourth indication information. Wherein, the first access network device processes the third data packet at the physical layer according to the physical layer parameters of the first access network device or according to the modulation mode of the physical layer included in the processing information of the third data packet, At least one of the modulation order, modulation and coding strategy (modulation and coding scheme, MCS) and other parameters, process the third data packet.

Therefore, in method 600, the first access network device requests to switch the transmission mode of the first access network device to MBSFN transmission by sending mode switching request information to the second access network device, so that switching from unicast transmission can be realized. It is MBSFN transmission. After switching to MBSFN transmission, the second access network device may send fourth instruction information to the first access network device, and the first access network device may send third data to the first access network device according to the fourth instruction information. After the packet is processed, it is sent to the terminal device, thereby ensuring accurate MBSFN transmission.

In the above method 500 and method 600, if the first access network device adopts unicast transmission, the data packet of the first service is sent by the core network device to the first access network device, which is described below with reference to FIG. 7 and FIG. 8. If the first access network device adopts unicast transmission, the data packet of the first service is sent by the second access network device to the first access network device.

The method 700 for transmitting data will be described below with reference to FIG. 7 taking the first transmission mode as unicast transmission and the current transmission mode of the first access network device as MBSFN as an example. Method 700 includes:

S710: The first access network device determines mode switching request information, where the mode switching request information is used to request to switch the transmission mode of the first service of the first access network device to unicast.

The scenarios in which the first access network device executes S720 include but are not limited to the following three scenarios:

S720: The first access network device sends mode switching request information to the second access network device, and the second access network device receives the mode switching request information from the first access network device.

Optionally, after receiving the mode switching request information, the second access network device disconnects from the first access network device for MBSFN transmission. At this time, the second access network device may be the first access network device. Control node. Optionally, the second access network device and the first access network device establish a transmission channel for forwarding data packets transmitted in a unicast manner.

If the data that the first access network device is currently performing unicast transmission comes from the second access network device, perform S730.

S730: The second access network device sends the sixth data packet of the first service to the first access network device.

It should be noted that the second access network device may receive the data packet about the first service from the core network device, and then send it to the first access network device after processing or without processing, for example, sending it to the first access network device. The sixth data packet.

For example, the sixth data packet may be a PDCP PDU or a PDCP service data unit (SDU) or an RLC PDU. In other words, if the first access network device switches the transmission mode of the first service to unicast, the second access network device can send to the first access network device that it has not been processed by the PDCP layer or that it has not been processed by the PDPC. The sixth data packet processed by the RLC layer or processed by the PDCP layer and RLC but not processed by the MAC layer.

It is understandable that the sixth data packet may be a data packet. At this time, the sixth data packet is for the first access network device to switch the transmission mode of the first service to unicast. The first data packet sent by the connected device. The third data packet can also be multiple data packets. At this time, the sixth data packet is for the first access network device to switch the transmission mode of the first service to unicast, and the second access network device sends the data to the first access network device. Multiple consecutive packets sent.

Optionally, the sixth data packet may be the response information of the mode switching request information in the method 300; optionally, the sixth data packet may be the response information independent of the mode switching request information in the method 300, in this case Next, the method 700 may further include the second access network device sending response information of the mode switching request information to the first access network device.

S740: The first access network device sends the processed sixth data packet to the terminal device.

Specifically, the first access network device determines the processing mode of each protocol stack layer according to the scheduling situation of its own time-frequency resource, network load situation and channel quality condition of the received sixth data packet, and finally processes the sixth data packet after processing. The data packet is sent to the terminal device.

Therefore, in the method 700, the first access network device requests to switch the transmission mode of the first access network device to unicast by sending the mode switching request information to the second access network device, so that the transmission from MBSFN to Switching of unicast transmission. In addition, after the first access network device switches to unicast transmission, the sixth data packet of the first service transmitted by the first access network device through unicast originates from the second access network device. The first access network device uses the processing methods of each protocol stack layer to process the sixth data packet and send it to the terminal device, which can ensure the continuity of the first service, thereby improving transmission efficiency. At the same time, the signaling overhead caused by establishing the transmission channel between the first access network device and the core network device is also avoided.

The method 800 for data transmission is described below with reference to FIG. 8 taking the first transmission mode as MBSFN transmission and the current transmission mode of the first access network device as unicast as an example. Method 800 includes:

S810: The first access network device determines mode switching request information, where the mode switching request information is used to request to switch the transmission mode of the first service of the first access network device to MBSFN transmission.

The scenarios in which the first access network device performs S820 include but are not limited to the following three scenarios:

S820: The first access network device sends mode switching request information to the second access network device, and the second access network device receives the mode switching request information from the first access network device.

Optionally, after receiving the mode switching request information, the second access network device establishes a connection with the first access network device for MBSFN transmission. In this case, the second access network device may be the device of the first access network device. Control node. Optionally, the second access network device disconnects the connection for unicast transmission with the first access network device.

At this time, the data currently being unicast transmitted by the first access network device originates from the second access network device.

S830. The second access network device sends the fourth indication information and the third data packet to the first access network device, and the first access network device receives the fourth indication information and the third data packet from the second access network device. . The fourth indication information is used to indicate at least one of the following: the time-frequency resource and/or frequency domain resource of the third data packet of the first service sent by the first access network device to the terminal device, and processing information of the third data packet.

It should be noted that the second access network device may receive the data packet about the first service from the core network device, and then send it to the first access network device after processing or without processing, for example, sending the third data packet to the first access network device. Access network equipment.

For the meaning of the third data packet, reference may be made to the related description in step S650.

It is understandable that the second access network device carries the fourth indication information and the third data packet in one message and sends it to the first access network device, or it can be carried in a different message to the first access network device. send.

Optionally, the fourth instruction information and/or the third data packet may be the response information of the mode switching request information in the method 300; optionally, the fourth instruction information and/or the third data packet may be independent of the method 300 In this case, the method 800 may further include the second access network device sending response information of the mode switching request information to the first access network device.

S840: The first access network device sends a third data packet to the terminal device according to the fourth instruction information.

Specifically, S840 includes: the first access network device sends a third data packet to the terminal device according to the physical (physical, PHY) layer parameters of the first access network device according to the fourth indication information. For example, after the first access network device processes the third data packet at the physical layer, it sends the third data packet to the terminal device in the time domain resource and/or frequency domain resource indicated by the fourth indication information. Wherein, the first access network device processes the third data packet at the physical layer according to the physical layer parameters of the first access network device or according to the modulation mode of the physical layer included in the processing information of the third data packet, At least one of the modulation order, MCS and other parameters is used to process the third data packet.

Therefore, in method 800, the first access network device requests to switch the transmission mode of the first access network device to MBSFN transmission by sending the mode switching request information to the second access network device, so that unicast transmission can be realized. Switch to MBSFN transmission. In addition, after the first access network device switches to MBSFN transmission, the second access network device may send fourth instruction information to the first access network device, and the first access network device may send the fourth instruction information to the first access network device according to the fourth instruction information. The network access device processes the third data packet and sends it to the terminal device, thereby ensuring accurate MBSFN transmission. At the same time, the signaling overhead caused by establishing the transmission channel between the first access network device and the core network device is also avoided.

It should be noted that in this embodiment of the application, the mode switching request information is used to request to switch the transmission mode of the first service of the first access network device as MBSFN transmission. It can also be understood that the mode switching request information is used to request the first access. The network access device stops using unicast to transmit the first service. Similarly, the mode switching request information used to request to switch the transmission mode of the first service of the first access network device to unicast can also be understood as the mode switching request information used to request the first access network device to stop using MBSFN transmission.

It should be understood that the "request" in the mode switching request information of the above method 300, method 500-method 800 does not limit the transmission mode of the first access network device that requires the second access network device's consent to switch the first service: The meaning of the first transmission mode can be that the first access network device makes a decision to switch the transmission mode of the first service to the first transmission mode, and then notifies the second access network device, so that the second access network device can be Perform a corresponding operation to cooperate with the first access network device to switch the transmission mode of the first service to the first transmission mode.

In the foregoing method 300, method 500-method 800, the first access network device determines the mode switching request information, and uses the mode switching request information to request the second access network device to switch the transmission mode of the first service to the first mode. In a possible design, the second access network device can act as a control node to determine that the transmission mode for switching the first service is the first transmission mode. The following is a schematic introduction with reference to FIG. 9 and FIG. 10.

In the following, with reference to FIG. 9, the first transmission mode is unicast, and the current transmission mode of the first access network device is MBSFN transmission, and the method 900 for transmitting data is described as an example. Method 900 includes:

S910: The second access network device determines fifth indication information, where the fifth indication information is used to instruct to switch the transmission mode of the first service of the first access network device to unicast.

It is understandable that, in S910, if the first access network device and the second access network device are performing MBSFN transmission, after the second access network device as the control node determines that it does not perform MBSFN transmission, the others will be The first access network device in which the second access network device jointly performs MBSFN transmission of the first service cannot perform MBSFN transmission. Therefore, the fifth instruction information may also indicate that the transmission mode of the first service of the second access network device is unicast. In this way, the first access network device determines that the second access network device does not use MBSFN according to the fifth instruction information. To transmit the first service, the first access network device itself also determines not to use MBSFN to transmit the first service, and therefore uses unicast to transmit the first service. In other words, the fifth instruction information can directly instruct the first access network device to switch the transmission mode of the first service to unicast, or indirectly indicate by instructing the second access network device to switch the transmission mode of the first service to unicast. Switch the transmission mode of the first service of the first access network device to unicast.

The scenarios in which the second access network device can perform S920 include but are not limited to the following three scenarios:

Case 1: When the second access network device obtains the measurement result through the terminal device and determines that the transmission mode switching needs to be performed according to the quality result, the second access network device determines to send the fifth instruction information to the first access network device.

Case 2: When the second access network device receives request information from the terminal device, and the request information is used to request the second access network device to perform transmission mode switching, the second access network device determines to send to the first access network device. The device sends fifth instruction information.

In case three, when the second access network device receives the transmission mode switching instruction information indicated by the core network device, the second access network device determines to send the fifth instruction information to the first access network device.

S920: The second access network device sends fifth instruction information to the first access network device, and the first access network device receives the fifth instruction information from the second access network device.

S930: If the first access network device supports unicast, the first access network device sends response information of the fifth indication information to the second access network device, and the response information of the fifth indication information is used to confirm the first access The network device switches the first transmission mode of the first service to unicast.

Correspondingly, if the first access network device does not support unicast, the first access network device sends response information of the fifth indication information to the second access network device, and the response information of the fifth indication information is used to confirm the first The access network device does not accept to switch the first transmission mode of the first service to unicast.

Optionally, S910-S930 may exist as a separate embodiment that does not depend on S940-S980 in method 900. In this way, in a scenario where the terminal device moves from the coverage area of the second access network device to the coverage area of the first access network device, the transmission mode of the first access network device can be switched to unicast transmission. Specifically, if the terminal device moves from the coverage area of the second access network device to the coverage area of the first access network device, the second access network device determines the access of the service terminal device according to the measurement report reported by the terminal device. The network device is switched to the first access network device, the second access network device may send a handover request message (such as the handover request message in Figure 4) to the first access network device, and the second access network device may send the switch in S920 The fifth indication information is carried in the handover request message and sent to the first access network device. The first access network device can send a handover request message confirmation message to the second access network device (as shown in Figure 4, handover request message confirmation Message), the confirmation message of the handover request message may include the confirmation information of the fifth indication information in S930, which can save signaling overhead. Of course, the fifth indication information in S920 may also be carried in a message sent by any second access network device to the first access network device, which is not limited in the embodiment of the present application. At the same time, the confirmation information of the fifth indication information in S930 may also be carried in any message sent by the first access network device to the second access network device, which is not limited in the embodiment of the present application. Optionally, in the scenario of FIG. 4, after the second access network device receives the confirmation message of the handover request message, the handover command sent to the terminal device carries the transmission mode instructing the first access network device to switch the first service It is unicast instruction information, so that the terminal device can better receive the data sent by the first access network device. In addition, the second access network device may switch the transmission mode of the first service to unicast according to the first access network device, and decide to forward a data packet of a certain protocol layer to the first access network device, for example, it may forward RLC layer data Packet or PDCP layer data packet.

S940: The second access network device sends sixth indication information to the core network device, where the sixth indication information is used to instruct the core network device to activate the first transmission channel, and the first transmission channel is used for the core network device to transmit to the first access network device Transmission of the first business.

For the first transmission channel, refer to the description in method 500.

It can be understood that there is no restriction on the order of S920, S940 and S960, and S920 can be performed before or before S940 and S960 or at the same time.

S950: The core network device activates the first transmission channel according to the sixth indication information.

It is understandable that in different embodiments, different indication information may be used to express the same meaning or the same indication information may be used to describe the same meaning. For example, the sixth indication information may be the first indication information in the method 500 and the method 600. The difference is that the first indication information in the method 500 and the method 600 comes from the first access network device, and the sixth indication in the method 900 The information comes from the second access network device.

S960. Send seventh indication information to the core network device, the core network device receives the seventh indication information, the seventh indication information is used to indicate the fourth data packet, and the fourth data packet is before the first access network device switches to unicast Or before the core network device activates the first transmission channel, the second access network device transmits the last data packet of the first service to the first access network device.

Wherein, the seven indication information includes a third sequence number, and the third sequence number is used to indicate the sequence of the fourth data packet in at least one data packet of the first service. The sequence number of each data packet in at least one data packet of the first service is uniformly configured by the core network device. In other words, the sequence of at least one data packet of the first service is uniformly configured by the core network device. It is understandable that, in S960, if the first access network device and the second access network device are performing MBSFN transmission, after the second access network device as the control node determines that it does not perform MBSFN transmission, the others will be The first access network device in which the second access network device jointly performs MBSFN transmission of the first service cannot perform MBSFN transmission. Therefore, the fourth data packet may also be the first service transmitted by the second access network device to the first access network device before the second access network device switches to unicast or before the core network device activates the first transmission channel. The last packet.

It should be noted that S940 and S960 can be carried in one message, or can be carried in different messages and sent at the same time, or sent in a sequential order, which is not limited in the embodiment of the present application.

S970: The core network device sends a fifth data packet to the first access network device through the first transmission channel according to the seventh indication information, where the fifth data packet is switched to by the first access network device After unicast or after the core network device activates the first transmission channel, the core network device transmits the first data packet of the first service to the first access network device. Optionally, the core network device may continue to send data packets after the fifth data packet after sending the fifth data packet.

Specifically, when the second access network device is performing MBSFN transmission, it determines the last data packet of the first service for MBSFN transmission, and the sequence number of the last data packet is X, that is, the seventh data packet sent to the core network device. The indication information indicates that the third sequence number of the fourth data packet is X. After the second access network device executes S960, the core network device determines according to the seventh instruction information that the sequence number of the first data packet of the first service to be unicast transmission is X+1, that is, the first data packet of the fifth data packet. Fourth, the serial number is X+1, and the core network device sends the fifth data packet with the serial number X+1 to the first access network device. In this way, the continuity of the data packet of the first service can be avoided, and the loss of the data packet can be avoided, thereby improving the transmission efficiency.

As an alternative to S960 and S970, the second access network device may send seventh indication information to the first access network device, and the first access network device sends eighth indication information to the core network device according to the seventh indication information, The eighth indication information is used to indicate a fifth data packet, and the fifth data packet indicates that after the first access network device is switched to the first transmission mode, the core network device sends the information to the first transmission mode. The first data packet of the first service transmitted by the access network device. In other words, in S960 and S970, the second access network device can directly send the seventh instruction information to the core network device, and the core network device determines to access the first access network device according to the seventh instruction information from the second access network device. The first data packet sent by the network device is the fifth data packet, or the second access network device may send seventh indication information to the first access network device, and the first access network device determines the core according to the seventh indication information The first data packet sent by the network device to the first access network device is the fifth data packet, and the first access network device sends eighth indication information to the core network device. The eighth indication information is used to indicate the fifth data. Bag.

Optionally, the eighth indication information includes a fourth sequence number, and the fourth sequence number is used to indicate the sequence of the fifth data packet in the at least one data packet of the first service.

Specifically, when the second access network device is performing MBSFN transmission, it determines the last data packet of the first service for MBSFN transmission, and the sequence number of the last data packet is X, that is, it sends to the first access network device The seventh indication information of indicates that the third sequence number of the fourth data packet is X. The first access network device determines according to the seventh indication information that the sequence number of the first data packet of the first service to be unicast transmission is X+1, that is, the fourth sequence number of the fifth data packet is X+1, The core network device sends a fifth data packet with a sequence number of X+1 to the first access network device. In this way, the continuity of the data packet of the first service can be avoided, and the loss of the data packet can be avoided, thereby improving the transmission efficiency. It is understandable that, in S970, if the first access network device and the second access network device are performing MBSFN transmission, after the second access network device as the control node determines that it does not perform MBSFN transmission, the other and the first The first access network device where the two access network devices jointly perform MBSFN transmission of the first service also cannot perform MBSFN transmission. Therefore, the fifth data packet may also be the first data packet of the first service transmitted by the core network device to the first access network device after the second access network device switches to unicast.

S980: The first access network device processes the received fifth data packet according to its own protocol stack parameters and then sends it to the terminal device.

Specifically, the first access network device determines the processing mode of each protocol stack layer according to the scheduling situation of its own time-frequency resource, network load situation, and channel quality condition of the received fifth data packet, and finally processes the fifth data packet after processing. The data packet is sent to the terminal device.

Therefore, in the method 900, the second access network device sends the fifth indication information to the first access network device to instruct to switch the transmission mode of the first access network device to unicast, which can realize the transmission from MBSFN to Switching of unicast transmission. In addition, the seventh indication information sent by the second access network device to the core network device can ensure the continuity of the first service, or the seventh indication information sent by the second access network device to the first access network device, and, The eighth instruction information sent by the first access network device to the core network device according to the seventh instruction information can ensure the continuity of the first service, thereby improving transmission efficiency. In the following, a method 1000 for data transmission will be described with reference to FIG. 10 taking the first transmission mode as MBSFN transmission and the current transmission mode of the first access network device as unicast as an example. Method 1000 includes:

S1010: The second access network device determines fifth indication information, where the fifth indication information is used to indicate that the transmission mode of the first service of the first access network device is MBSFN.

It is understandable that in S1010, the first access network device is using unicast to transmit the first service, and the second access network device expects the first access network device and the second access network device to perform MBSFN transmission together, so The fifth indication information determined by the second access network device is used to indicate that the transmission mode of the first service of the first access network device is MBSFN. It can be understood from another perspective that the second access network device is performing MBSFN transmission, and the second access network device expects the first access network device and the second access network device to perform MBSFN transmission together. Therefore, the second access network device determines The fifth instruction information may also indicate that the transmission mode of the first service of the second access network device is MBSFN transmission. In this way, the first access network device determines that the second access network device uses MBSFN to transmit the first service according to the fifth instruction information. Service, the first access network device itself also determines that it can use MBSFN transmission and the second access network device to transmit the first service. In other words, the fifth indication information can directly instruct the first access network device to switch the transmission mode of the first service to MBSFN, or it can instruct the second access network device to switch the transmission mode of the first service to MBSFN indirectly. The transmission mode of the first service of an access network device is MBSFN.

The scenarios in which the second access network device can perform S1020 include but are not limited to the following three scenarios:

Case 3: When the second access network device receives the transmission mode switching instruction information from the core network device, the second access network device determines to send the fifth instruction information to the first access network device.

S1020: The second access network device sends fifth instruction information to the first access network device, and the first access network device receives the fifth instruction information from the second access network device.

S1030: If the first access network device supports MBSFN, the first access network device sends response information of the fifth indication information to the second access network device, and the response information of the fifth indication information is used to indicate the first access network The first transmission mode for the device to switch the first service is MBSFN.

Correspondingly, if the first access network device does not support MBSFN, the first access network device sends response information of the fifth indication information to the second access network device, and the response information of the fifth indication information is used to indicate the first access network device. The first transmission mode in which the network access device does not switch the first service is MBSFN.

Optionally, S1010-S1030 may exist as a separate embodiment, independent of S1040-S1070 in method 1000. In this way, in a scenario where the terminal device moves from the coverage area of the second access network device to the coverage area of the first access network device, the transmission mode of the first access network device can be switched to MBSFN transmission. Specifically, if the terminal device moves from the coverage area of the second access network device to the coverage area of the first access network device, the second access network device determines the access of the service terminal device according to the measurement report reported by the terminal device. The network device is switched to the first access network device, the second access network device can send a handover request message (such as the handover request message in Figure 4) to the first access network device, and the second access network device can send the switch in S1020 The fifth indication information is carried in the handover request message and sent to the first access network device. The first access network device can send a handover request message confirmation message to the second access network device (as shown in Figure 4, handover request message confirmation Message), the confirmation message of the handover request message may include the confirmation information of the fifth indication information in S1030, which can save signaling overhead. Of course, the fifth indication information in S1020 may also be carried in a message sent by any second access network device to the first access network device, which is not limited in the embodiment of the present application. At the same time, the confirmation information of the fifth indication information in S1030 may also be carried in any message sent by the first access network device to the second access network device, which is not limited in the embodiment of the present application. Optionally, in the scenario of FIG. 4, after the second access network device receives the confirmation message of the handover request message, the handover command sent to the terminal device carries the transmission mode instructing the first access network device to switch the first service The instruction information transmitted for MBSFN, so that the terminal device can better receive the data sent by the first access network device. In addition, the second access network device can switch the transmission mode of the first service to MBSFN transmission according to the first access network device to decide to forward a data packet of a certain protocol layer to the first access network device, for example, it can forward MAC layer data Bag.

S1040. The second access network device sends sixth indication information to the core network device. The sixth indication information is used to instruct the core network device to deactivate the first transmission channel. The device transmits the first service.

For the first transmission channel, refer to the description in method 500.

It can be understood that there is no restriction on the order of S1020 and S1040, and S1020 can be performed before or before S1040 or at the same time.

S1050: The core network device deactivates the first transmission channel according to the sixth indication information.

S1070. The second access network device sends the fourth indication information and the third data packet to the first access network device, and the first access network device receives the fourth indication information and the third data packet from the second access network device. . The fourth indication information is used to indicate at least one of the following: the time-frequency resource and/or frequency domain resource of the third data packet of the first service sent by the first access network device to the terminal device, and processing information of the third data packet.

Among them, the processing information of the third data packet includes: physical layer processing such as modulation mode, modulation order, MCS parameters, etc.

S1070: The first access network device sends a third data packet to the terminal device according to the fourth instruction information.

Specifically, S1070 includes: after the first access network device processes the third data packet at the physical layer, sending the third data packet to the terminal device after the time domain resource and/or frequency domain resource indicated by the fourth indication information. Wherein, the first access network device processes the third data packet at the physical layer according to the physical layer parameters of the first access network device or according to the modulation mode of the physical layer included in the processing information of the third data packet, At least one of the modulation order, modulation and coding scheme (modulation and coding scheme, MCS) and other parameters, the third data packet is processed The transmission mode of the first service of the first access network device is MBSFN transmission, which can also be understood as that the fifth indication information is used to instruct the first access network device to stop using unicast to transmit the first service. The fifth indication information is used to instruct to switch the transmission mode of the first service of the second access network device to MBSFN transmission, which can also be understood as the fifth indication information used to instruct the second access network device to stop using unicast to transmit the first service. Similarly, the fifth indication information is used to instruct to switch the transmission mode of the first service of the first access network device to unicast, and it can also be understood that the fifth indication information is used to instruct the first access network device to stop using MBSFN transmission. The fifth indication information is used to instruct to switch the transmission mode of the first service of the second access network device to unicast, and it can also be understood that the fifth indication information is used to instruct the second access network device to stop using MBSFN transmission.

Therefore, in the method 1000, the second access network device sends the fifth instruction information to the first access network device to instruct to switch the transmission mode of the first access network device to MBSFN transmission, which can realize the unicast transmission Switch to MBSFN transmission. In addition, after the first access network device switches to MBSFN transmission, the second access network device may send fourth instruction information to the first access network device, and the first access network device may send the fourth instruction information to the first access network device according to the fourth instruction information. The network access device processes the third data packet and sends it to the terminal device, thereby ensuring accurate MBSFN transmission. At the same time, the signaling overhead caused by establishing the transmission channel between the first access network device and the core network device is also avoided.

It should be noted that, in this embodiment of the present application, a data packet is forwarded through two different paths, and the data packets on the two paths may include the same packet headers with different payloads. For example, the first data packet in S560 and S580 may be a data packet obtained by processing in different ways, and the first data packet in S560 and S580 may include the same payload and different headers; for example, the first data packet in S730 and S740 The sixth data packet may be a data packet obtained by processing in different ways, and the sixth data packet in S730 and S740 includes the same header with different payloads. For example, the third data packet in S830 and S840 may be a data packet obtained by processing in different ways, and the third data packet in S830 and S840 may include the same header with different payloads. For example, the fifth data packet in S970 and S980 may be a data packet obtained by processing in different ways, and the fifth data packet in S970 and S980 may include the same header with different payloads. For example, the fifth data packet in S1060 and S1070 may be a data packet obtained by processing in different ways, and the fifth data packet in S1060 and S1070 may include the same packet header with different payloads.

Among the first data packet, the second data packet, the third data packet, the fourth data packet, the fifth data packet, and the sixth data packet mentioned in the embodiment of the application, two data packets may be data of different protocol stacks. The packet, or the existence of two data packets among the first data packet, the second data packet, the third data packet, the fourth data packet, the fifth data packet, and the sixth data packet may be data packets processed by the same protocol stack.

The various embodiments described in this document may be independent solutions, or may be combined according to internal logic, and these solutions fall within the protection scope of the present application.

It can be understood that the methods and operations implemented by the first access network device in the foregoing method embodiments may also be implemented by components (such as chips or circuits) that can be used in the first access network device. The methods and operations implemented by the second access network device can also be implemented by components (such as chips or circuits) that can be used for the second access network device. The methods and operations implemented by the core network device in each of the foregoing method embodiments It can also be implemented by components (such as chips or circuits) that can be used in the core network.

The method embodiments provided by the present application are described above, and the device embodiments provided by the present application will be described below. It should be understood that the description of the device embodiment and the description of the method embodiment correspond to each other. Therefore, for the content that is not described in detail, please refer to the above method embodiment. For the sake of brevity, it will not be repeated here.

The foregoing describes the solutions provided in the embodiments of the present application mainly from the perspective of interaction between various network elements. It can be understood that each network element, such as a transmitting end device or a receiving end device, includes hardware structures and/or software modules corresponding to each function in order to realize the above-mentioned functions. Those skilled in the art should be aware that, in combination with the units and algorithm steps of the examples described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered as going beyond the scope of protection of this application.

The embodiments of the present application can divide the transmitting end device or the receiving end device into functional modules based on the foregoing method examples. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one process. Module. The above-mentioned integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other feasible division methods in actual implementation. The following is an example of dividing each function module corresponding to each function.

FIG. 11 is a data transmission device provided by an embodiment of the application. The device 1100 includes a processing unit 1110 and a transceiver unit 1120. The transceiver unit 1120 can communicate with the outside, and the processing unit 1110 is used for data processing. The transceiving unit 1120 may also be referred to as a communication interface or a communication unit.

The processing unit 1110 is configured to determine mode switching request information, where the mode switching request information is used to request to switch the transmission mode of the first service to the first transmission mode, and the first transmission mode includes multicast or unicast;

The transceiver unit 1120 is configured to send the mode switching request information to the second access network device.

As an optional embodiment, the transceiving unit 1120 is further configured to: send first indication information to the core network device, where the first indication information is used to instruct the core network device to activate or deactivate the first transmission channel, so The first transmission channel is used by the core network equipment to transmit the first service to the device.

As an optional embodiment, the transceiving unit 1120 is further configured to: send second indication information to the core network device, where the second indication information is used to indicate a first data packet, and the first data packet is in the After the device switches the first transmission mode, the core network device transmits the first data packet of the first service to the device.

As an optional embodiment, the transceiving unit 1120 is further configured to: receive third indication information from the second access network device, where the third indication information is used to indicate a second data packet, and the second The data packet is the last data packet of the first service transmitted by the second access network device to the device before the device switches the first transmission mode.

As an optional embodiment, the second indication information includes a first sequence number, and the first sequence number is used to indicate the sequence of the first data packet in at least one data packet of the first service; and /or

The third indication information includes a second sequence number, and the second sequence number is used to indicate the sequence of the second data packet in at least one data packet of the first service.

As an optional embodiment, the transceiving unit 1120 is further configured to: send the third data packet to the terminal device according to the fourth instruction information, where the third data packet is a data packet of the first service, and The fourth indication information comes from the second access network device and is used to indicate at least one of the following: the apparatus 1100 sends the time domain resource and/or frequency domain resource of the third data packet to the terminal device;

Processing information of the third data packet.

As an optional embodiment, the transceiver unit 1120 is further configured to: receive response information of the mode switching request information from the second access network device, where the response information is used to confirm that the device switches the first service. The transmission mode is the first transmission mode.

FIG. 12 is a data transmission device provided by an embodiment of the application. The device 1200 includes a receiving unit 1210 and a sending unit 1220. The receiving unit 1210 and the sending unit 1220 can communicate with the outside. The receiving unit 1210 and the sending unit 1220 can also be referred to as a communication interface or a communication unit. Optionally, the device 1200 may further include a processing unit for data processing.

The receiving unit 1210 is configured to receive mode switching request information from the first access network device, where the mode switching request information is used to request to switch the transmission mode of the first service to the first transmission mode, and the first transmission mode includes multiple Broadcast or unicast;

The sending unit 1220 is configured to send response information of the mode switching request information to the first access network device.

As an optional embodiment, the sending unit 1220 is configured to: send third indication information to the first access network device, where the third indication information is used to indicate a second data packet, and the second data packet This is the last data packet of the first service that the apparatus transmits to the first access network device before the first access network device switches the first transmission mode.

As an optional embodiment, the third indication information includes a second sequence number, and the second sequence number is used to indicate a sequence of the second data packet in at least one data packet of the first service.

As an optional embodiment, the sending unit 1220 is further configured to: send fourth indication information to the first access network device, where the fourth indication information is used to indicate at least one of the following: the first access The network device sends the time domain resource and/or frequency domain resource of the third data packet of the first service to the terminal device;

Processing information of the third data packet.

It should be understood that the device 1100 and the device 1200 herein are embodied in the form of functional units. The term "unit" here can refer to application specific integrated circuits (ASICs), electronic circuits, processors used to execute one or more software or firmware programs (such as shared processors, proprietary processors, or groups). Processor, etc.) and memory, merged logic circuits, and/or other suitable components that support the described functions. In an optional example, those skilled in the art can understand that the apparatus 1100 may be specifically the first access network device in the foregoing embodiment, and may be used to execute each of the first access network device in the foregoing method embodiment. In order to avoid repetition, the process and/or steps will not be repeated here. In another optional example, those skilled in the art can understand that the apparatus 1200 may be specifically the second access network device in the foregoing embodiment, and may be used to execute the second access network device corresponding to the second access network device in the foregoing method embodiment. In order to avoid repetition, each process and/or step will not be repeated here.

The apparatus 1100 of each of the foregoing solutions has the function of implementing the corresponding steps performed by the first access network device in the foregoing method. The apparatus 1200 of each of the foregoing solutions has the function of implementing the corresponding steps performed by the second access network device in the foregoing method. The function can be realized by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions; for example, the communication unit can be replaced by a transceiver (for example, the sending unit in the communication unit can be replaced by a transmitter, and the receiving unit in the communication unit can be replaced by a receiver. Or the communication unit can be replaced by a communication interface), and other units, such as a processing unit, can be replaced by a processor, and perform the transceiver operations and related processing operations in each method embodiment respectively.

In addition, the above-mentioned transceiving unit may also be a transceiving circuit (for example, it may include a receiving circuit and a transmitting circuit), and the processing unit may be a processing circuit. In the embodiment of the present application, the device in FIG. 11 may be the first access network device in the foregoing embodiment, or may be a chip or a chip system, such as a system on chip (SoC). Wherein, the communication unit may be an input/output circuit or a communication interface; the processing unit is a processor, microprocessor, or integrated circuit integrated on the chip. There is no limitation here. The device in FIG. 12 may be the second access network device in the foregoing embodiment, or may be a chip or a chip system, such as a system on chip (system on chip, SoC). Wherein, the communication unit may be an input/output circuit or a communication interface; the processing unit is a processor, microprocessor, or integrated circuit integrated on the chip. There is no limitation here.

FIG. 13 shows a data transmission 1300 provided by an embodiment of the present application. The device 1300 includes a processor 1310 and a communication interface 1320. The processor 1310 and the communication interface 1320 communicate with each other through an internal connection path, and the processor 1310 is used to execute instructions to control the communication interface 1320 to send signals and/or receive signals.

Optionally, the device 1300 may further include a memory 1330, and the memory 1330 communicates with the processor 1310 and the communication interface 1320 through an internal connection path. The memory 1330 is used to store instructions, and the processor 1310 can execute the instructions stored in the memory 1330.

In a possible implementation manner, the apparatus 1300 is configured to implement each process and step corresponding to the first access network device in the foregoing method embodiment.

In another possible implementation manner, the apparatus 1300 is configured to implement each process and step corresponding to the second access network device in the foregoing method embodiment.

It should be understood that the apparatus 1300 may be specifically the first access network device or the second access network device in the foregoing embodiment, or may be a chip or a chip system. Correspondingly, the communication interface 1320 may be the transceiver circuit of the chip, which is not limited here. Specifically, the apparatus 1300 may be used to execute various steps and/or processes corresponding to the first access network device or the second access network device in the foregoing method embodiment. Optionally, the memory 1330 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A part of the memory may also include a non-volatile random access memory. For example, the memory can also store device type information. The processor 1310 may be used to execute instructions stored in the memory, and when the processor 1310 executes the instructions stored in the memory, the processor 1310 is used to execute the above-mentioned interaction with the first access network device or the second access network device. Each step and/or process of the corresponding method embodiment.

In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in the processor or instructions in the form of software. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

It should be noted that the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method embodiments may be completed by hardware integrated logic circuits in the processor or instructions in the form of software. The above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components . The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), and synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM) ) And direct memory bus random access memory (direct rambus RAM, DR RAM). It should be noted that the memories of the systems and methods described herein are intended to include, but are not limited to, these and any other suitable types of memories.

According to the method provided in the embodiments of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code runs on a computer, the computer executes the first Each step or process executed by the access network device or the second access network device.

According to the method provided in the embodiments of the present application, the present application also provides a computer-readable storage medium that stores program code. When the program code runs on a computer, the computer executes the above-mentioned embodiments. Each step or process executed by the first access network device or the second access network device.

According to the method provided in the embodiments of the present application, the present application also provides a communication system, which includes at least two of the aforementioned first access network device, second access network device, terminal device, and core network device.

The embodiments shown in Fig. 11 to Fig. 13 in the above-mentioned device embodiments completely correspond to the embodiments shown in Fig. 3 to Fig. 10 in the method embodiments, and the corresponding modules or units execute the corresponding steps, such as communication The unit (transceiver) executes the steps of receiving or sending in the method embodiment, and other steps except sending and receiving can be executed by the processing unit (processor). The function of the specific unit can be based on the corresponding method embodiment. Among them, there may be one or more processors.

In this application, "instructions" can include direct instructions and indirect instructions, as well as explicit instructions and implicit instructions. The information indicated by a certain piece of information is called information to be indicated. In the specific implementation process, there can be many ways to indicate the information to be indicated. For example, but not limited to, the information to be indicated can be directly indicated, such as indicating the information to be indicated itself. Or the index of the information to be indicated, etc. The information to be indicated can also be indicated indirectly by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance. For example, it is also possible to realize the indication of specific information by means of a pre-arranged order (for example, stipulated in an agreement) of various information, so as to reduce the indication overhead to a certain extent.

In the embodiments of the present application, the terms and English abbreviations are all illustrative examples provided for convenience of description, and should not constitute any limitation to the present application. This application does not exclude the possibility of defining other terms that can achieve the same or similar functions in existing or future agreements.

In the embodiments of the present application, the first, second, and various numerical numbers are only for easy distinction for description, and are not used to limit the scope of the embodiments of the present application. For example, distinguish different network slices, distinguish different network devices, and so on.

The terms "component", "module", "system", etc. used in this specification are used to denote computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, the component may be, but is not limited to, a process, a processor, an object, an executable file, an execution thread, a program, and/or a computer running on a processor. Through the illustration, both the application running on the computing device and the computing device can be components. One or more components may reside in processes and/or threads of execution, and components may be located on one computer and/or distributed between two or more computers. In addition, these components can be executed from various computer-readable storage media having various data structures stored thereon. The component can be based on, for example, a signal having one or more data packets (e.g. data from two components interacting with another component in a local system, a distributed system, and/or a network, such as the Internet that interacts with other systems through a signal) Communicate through local and/or remote processes.

It should be understood that "at least one" in this document refers to one or more, and "plurality" refers to two or more than two. "And/or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects before and after are in an "or" relationship. "The following at least one item (a)" or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a). For example, at least one of a, b, and c can mean: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c, where a, b, c can be single or multiple.

Those of ordinary skill in the art may realize that the various illustrative logical blocks and steps described in the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. accomplish. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for convenience and concise description, the specific working process of the above-described system, device, and unit may be based on the corresponding process in the foregoing method embodiment, and will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

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

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

In the foregoing embodiments, the functions of each functional unit may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions (programs). When the computer program instructions (programs) are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disks or optical disks and other media that can store program codes. .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A method for data transmission, characterized in that the method is applicable to a first access network device, and the method includes:

Determining mode switching request information, where the mode switching request information is used to request to switch the transmission mode of the first service to the first transmission mode, and the first transmission mode includes multicast or unicast;

Sending the mode switching request information to the second access network device.
The method according to claim 1, wherein the method further comprises:

Send first indication information to a core network device, where the first indication information is used to instruct the core network device to activate or deactivate a first transmission channel, and the first transmission channel is used by the core network device to send the first transmission channel to the first transmission channel. An access network device transmits the first service.
The method according to claim 1 or 2, wherein the method further comprises:

Send second indication information to the core network device, where the second indication information is used to indicate a first data packet, and the first data packet is after the first access network device switches the first transmission mode. The first data packet of the first service transmitted by the core network device to the first access network device.
The method according to any one of claims 1 to 3, wherein the method further comprises:

Receiving third indication information from the second access network device, where the third indication information is used to indicate a second data packet, where the second data packet is for switching the first access network device to the first access network device Before a transmission mode, the last data packet of the first service transmitted by the second access network device to the first access network device.
The method of claim 4, wherein:

The second indication information includes a first sequence number, and the first sequence number is used to indicate the sequence of the first data packet in at least one data packet of the first service; and/or

The third indication information includes a second sequence number, and the second sequence number is used to indicate the sequence of the second data packet in at least one data packet of the first service.
The method according to any one of claims 1 to 5, wherein the method further comprises:

Sending the third data packet to the terminal device according to the fourth instruction information,

The third data packet is a data packet of the first service, and the fourth indication information comes from the second access network device and is used to indicate at least one of the following:

Sending, by the first access network device, the time domain resource and/or frequency domain resource of the third data packet to the terminal device;

Processing information of the third data packet.
The method according to any one of claims 1 to 6, wherein the method further comprises:

Receiving response information of the mode switching request information from the second access network device, where the response information is used to confirm that the transmission mode for the first access network device to switch the first service is the first transmission mode.
A method for data transmission, characterized in that the method is applicable to a second access network device, and the method includes:

Receiving mode switching request information from the first access network device, where the mode switching request information is used to request to switch the transmission mode of the first service to the first transmission mode, and the first transmission mode includes multicast or unicast;

Sending response information of the mode switching request information to the first access network device.
The method according to claim 8, wherein the method further comprises:

Send third indication information to the first access network device, where the third indication information is used to indicate a second data packet, and the second data packet is for switching the first access network device to the first access network device. Before the transmission mode, the last data packet of the first service transmitted by the second access network device to the first access network device.
The method according to claim 9, wherein the third indication information includes a second sequence number, and the second sequence number is used to indicate at least one data of the second data packet in the first service The order in the package.
[Corrected according to Rule 91 08.06.2020]

The method according to any one of claims 8 to 10, wherein the method further comprises:

Send fourth indication information to the first access network device, where the fourth indication information is used to indicate at least one of the following:

Sending, by the first access network device, the time domain resource and/or frequency domain resource of the third data packet of the first service to a terminal device;

Processing information of the third data packet.
A data transmission device, characterized in that the method includes:

A processing unit, configured to determine mode switching request information, where the mode switching request information is used to request to switch the transmission mode of the first service to the first transmission mode, and the first transmission mode includes multicast or unicast;

The transceiver unit is configured to send the mode switching request information to the second access network device.
The device according to claim 12, wherein the transceiver unit is further configured to:

Send first indication information to a core network device, where the first indication information is used to instruct the core network device to activate or deactivate a first transmission channel, and the first transmission channel is used by the core network device to send the device to the device Transmitting the first service.
The device according to claim 12 or 13, wherein the transceiver unit is further configured to:

Sending second indication information to the core network device, where the second indication information is used to indicate a first data packet, and the first data packet indicates that after the device switches the first transmission mode, the core network device sends The first data packet of the first service transmitted by the apparatus.
The device according to any one of claims 12 to 14, wherein the transceiver unit is further configured to:

Receiving third indication information from the second access network device, where the third indication information is used to indicate a second data packet, where the second data packet is before the device switches the first transmission mode, The last data packet of the first service transmitted by the second access network device to the apparatus.
The device of claim 15, wherein:

The second indication information includes a first sequence number, and the first sequence number is used to indicate the sequence of the first data packet in at least one data packet of the first service; and/or

The third indication information includes a second sequence number, and the second sequence number is used to indicate the sequence of the second data packet in at least one data packet of the first service.
The device according to any one of claims 12 to 16, wherein the transceiver unit is further configured to:

Sending the third data packet to the terminal device according to the fourth instruction information,

The third data packet is a data packet of the first service, and the fourth indication information comes from the second access network device and is used to indicate at least one of the following:

Sending, by the apparatus, the time domain resource and/or frequency domain resource of the third data packet to the terminal device;

Processing information of the third data packet.
The device according to any one of claims 12 to 17, wherein the transceiver unit is further configured to:

Receiving response information of the mode switching request information from the second access network device, where the response information is used to confirm that the transmission mode of the apparatus for switching the first service is the first transmission mode.
A data transmission device, characterized in that the device includes:

The receiving unit is configured to receive mode switching request information from the first access network device, where the mode switching request information is used to request to switch the transmission mode of the first service to the first transmission mode, and the first transmission mode includes multicast Or unicast;

The sending unit is configured to send response information of the mode switching request information to the first access network device.
The device according to claim 19, wherein the sending unit is configured to:

Send third indication information to the first access network device, where the third indication information is used to indicate a second data packet, and the second data packet is for switching the first access network device to the first access network device. Before the transmission mode, the last data packet of the first service transmitted by the apparatus to the first access network device.
The apparatus according to claim 20, wherein the third indication information comprises a second sequence number, and the second sequence number is used to indicate at least one data of the second data packet in the first service The order in the package.
The device according to any one of claims 19 to 21, wherein the sending unit is further configured to:

Send fourth indication information to the first access network device, where the fourth indication information is used to indicate at least one of the following:

Sending, by the first access network device, the time domain resource and/or frequency domain resource of the third data packet of the first service to a terminal device;

Processing information of the third data packet.