CN111865481A

CN111865481A - Data transmission method and device

Info

Publication number: CN111865481A
Application number: CN201910359404.2A
Authority: CN
Inventors: 黄曲芳; 罗海燕
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-10-30
Anticipated expiration: 2039-04-30
Also published as: WO2020221011A1; CN111865481B

Abstract

The application provides a method and a device for data transmission, wherein the method comprises the following steps: the network equipment sends a data packet to the terminal equipment through the intermediate node, firstly, the network equipment determines a first DCI and a first data packet, the first DCI is processed through the identification of the terminal equipment, the first data packet comprises the data packet sent to the terminal equipment, and secondly, the network equipment sends the first DCI and the first data packet to the intermediate node. According to the data transmission method, the terminal equipment can only monitor the signal sent by the intermediate node, the complexity of the terminal equipment is reduced, the intermediate node only needs to descramble the first DCI correctly to obtain the first data packet, the first data packet does not need to be analyzed, and the first data packet is directly forwarded to the terminal equipment, so that the data packet can be forwarded quickly, and the data transmission performance is improved.

Description

Data transmission method and device

Technical Field

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

Background

The future fifth generation (5th generation, 5G) system mainly supports three types of services:

enhanced mobile broadband communications (eMBB), massive machine type communications (mtc), and ultra-reliable and low latency communications (URLLC). For URLLC, there are relatively high requirements on delay and reliability. For example, URLLC traffic requires 0.5ms of delay and 10-8 of reliability in extreme cases. Among them, one of the most common application scenarios of URLLC is industrial control, and the data transmission model of industrial control is very different from that of the conventional wireless communication network. The data transmitted by the conventional wireless communication network is irregular, that is, the mobile communication network does not know what the transmitted data is, and the data is transmitted after being received. However, for industrial control, the action instructions for each production run are predictable. For industrial control, the signaling transmitted by the wireless network is very regular. For this reason, an X node (NodeX) is introduced, reducing the amount of data transmission between the control center and the network device. The NodeX learns the production flow in advance, so the control center only needs to trigger the network equipment to start the production flow, the network equipment informs the NodeX to start the production flow, and the NodeX controls the terminal equipment to finish the production flow after receiving the notification message of the network equipment. By adopting the mode, the NodeX can be deployed to be closer to the terminal equipment, so that a large amount of data transmission is carried out between the NodeX and the terminal equipment, and the distance between the NodeX and the terminal equipment is closer, thereby saving wireless resources and reducing power.

However, the above method requires the terminal device to receive only the data of the node x, and not receive the data directly from the network device. In fact, some data of the network device still needs to be directly transmitted to the terminal device, and for the data, the data needs to be forwarded by the node x, and generally, the data is relatively urgent data, and the delay requirement is relatively high. For example, in the event of an emergency, the control center notifies the network device to stop operating. How to transmit the forwarding data needs to be considered to ensure normal communication.

Disclosure of Invention

The application provides a data transmission method and device, which aim to guarantee normal communication.

In a first aspect, a method for data transmission is provided, where a network device sends a data packet to a terminal device via an intermediate node, and the method includes: the network equipment determines a first DCI and a first data packet, wherein the first DCI is processed through the identifier of the terminal equipment, and the first data packet comprises the data packet sent to the terminal equipment; the network device sends the first DCI and the first data packet to the intermediate node.

According to the data transmission method provided by the embodiment of the application, when the network equipment needs to send the data packet to the terminal equipment, the data packet can be forwarded through the intermediate node, and then the terminal equipment only needs to monitor the signal sent by the intermediate node, so that the complexity of the terminal equipment is reduced. The first DCI sent by the network equipment to the intermediate node is scrambled by the identifier of the terminal equipment, and the intermediate node only needs to descramble the first DCI correctly to obtain the first data packet without descrambling the first data packet, so that the data packet can be forwarded quickly, and the data transmission performance is improved.

In one case, the processing of the first DCI referred to in this application via the identity of the terminal device may include scrambling the first data packet via the identity of the terminal device.

A correspondence may exist between a first DCI sent by the network device to the intermediate node and the first data packet, where the first DCI is used for the intermediate node to obtain the first data packet.

It should be further understood that the terminal device mentioned above does not refer to a specific terminal device, and may be any one of a plurality of terminal devices connected by an intermediate node. The connection of an intermediate node to a certain terminal device may also be described as a certain terminal device being associated with the intermediate node.

With reference to the first aspect, in some implementations of the first aspect, before the network device determines the first DCI and the first data packet, the method further includes: the network equipment distributes the identification of the terminal equipment to the terminal equipment; the network device sends the identifier of the terminal device to the intermediate node.

With reference to the first aspect, in some implementations of the first aspect, before the network device determines the first DCI and the first data packet, the method further includes:

and the network equipment receives the identifier of the terminal equipment sent by the intermediate node.

In the data transmission method provided in the embodiment of the present application, the identifier of the terminal device that scrambles the first DCI may be configured by the network device or configured by the intermediate node. A flexible scheme for configuring the identity of a terminal device is provided.

It should be understood that the identifier of the terminal device referred to in this application may refer to an RNTI of the terminal device, or Information (ID) such as an identifier of the terminal device, which can identify the terminal device.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: the network equipment sends a switching request to target network equipment, wherein the switching request is used for requesting the intermediate node and the terminal equipment to be accessed to the target network equipment, and the switching request carries the identifier of the terminal equipment; the network equipment receives a switching response sent by target network equipment, wherein the switching response comprises first indication information, and the first indication information is used for indicating that the identifier of the terminal equipment needs to be updated; the network equipment sends a switching command to the intermediate node, wherein the switching command is used for informing the intermediate node to access the target network equipment, and the switching command comprises first indication information.

According to the data transmission method provided by the embodiment of the application, when the intermediate node and the terminal device are switched to the target network device, if the identifier of the terminal device conflicts with the identifier of the terminal device under the target network device, the target network device can indicate that the identifier of the terminal device to be switched is updated to other identifiers, so that the conflict with the identifier of the local terminal device is avoided.

It should be understood that the message for requesting the intermediate node and the terminal device to access the target network device is referred to as a handover request in this application only by way of example, and does not limit the scope of the application.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: the network equipment receives connection failure indication information sent by the intermediate node, wherein the connection failure indication information is used for indicating connection failure between the terminal equipment and the intermediate node.

The data transmission method provided by the embodiment of the application is used when the intermediate node determines that the connected terminal equipment is disconnected. The intermediate node informs the network equipment of the connection failure information of the terminal equipment, so that the network equipment determines that the terminal equipment cannot continuously accept data. The data which can not reach the terminal equipment is prevented from being sent by the network equipment.

It should be understood that the indication information for indicating the connection failure between the terminal device and the intermediate node is referred to as connection failure indication information in this application by way of example only, and does not set any limit to the scope of the application.

In a second aspect, a method for data transmission is provided, including: the intermediate node receives a first DCI and a first data packet sent by the network equipment, the first DCI is processed through the identifier of the terminal equipment, and the first data packet comprises the data packet sent to the terminal equipment; the intermediate node descrambles the first DCI based on the identifier of the terminal equipment to obtain a first data packet; and the intermediate node sends a third DCI and the first data packet to the terminal equipment, and the third DCI is processed through the identifier of the terminal equipment.

According to the data transmission method provided by the embodiment of the application, when the network equipment needs to send the data packet to the terminal equipment, the data packet can be forwarded through the intermediate node, and then the terminal equipment only needs to monitor the signal sent by the intermediate node, so that the complexity of the terminal equipment is reduced. The first DCI sent by the network equipment to the intermediate node is scrambled by the identifier of the terminal equipment, the intermediate node only needs to descramble the first DCI correctly to obtain the first data packet, the first data packet does not need to be descrambled, and the first data packet is directly sent to the terminal equipment, so that the data packet can be forwarded quickly, and the data transmission performance is improved.

In one case, the first DCI referred to in this application is processed via the identity of the terminal device, which may be understood as the first data packet being scrambled via the identity of the terminal device.

A correspondence may exist between a first DCI sent by the network device to the intermediate node and the first data packet, where the first DCI is used for the intermediate node to obtain the first data packet. Similarly, a corresponding relationship may exist between the third DCI sent by the intermediate node to the terminal device and the first data packet, that is, the third DCI is used by the terminal device to obtain the first data packet.

With reference to the second aspect, in some implementations of the second aspect, before the intermediate node receives the first DCI and the first data packet sent by the network device, the method further includes: the intermediate node distributes the identification of the terminal equipment to the terminal equipment; and the intermediate node sends the identifier of the terminal equipment to the network equipment.

With reference to the first aspect, in some implementations of the first aspect, before the network device determines the first DCI and the first data packet, the method further includes: and the intermediate node receives the identifier of the terminal equipment sent by the network equipment.

In the data transmission method provided in the embodiment of the present application, the identifier of the terminal device that scrambles the first DCI may be configured by the network device or configured by the intermediate node. Flexible configuration schemes are provided.

It should be understood that the identifier of the terminal device referred to in this application may refer to an RNTI of the terminal device, or information such as an ID of the terminal device capable of identifying the terminal device.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: and the intermediate node receives a switching command sent by the network equipment, wherein the switching command is used for informing the intermediate node to access the target network equipment, the switching command comprises first indication information, and the first indication information is used for indicating that the identifier of the terminal equipment needs to be updated.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: and the intermediate node sends connection failure indication information to the network equipment, wherein the connection failure indication information is used for indicating the connection failure between the terminal equipment and the intermediate node.

According to the data transmission method provided by the embodiment of the application, when the intermediate node determines that the connected terminal equipment is disconnected, the terminal equipment is not connected with the intermediate node any more. The intermediate node informs the network equipment of the connection failure information of the terminal equipment, so that the network equipment determines that the terminal equipment cannot continuously accept data.

In a third aspect, a method for data transmission is provided, including: the terminal equipment receives third DCI and the first data packet sent by the intermediate node, wherein the third DCI is processed through the identifier of the terminal equipment, and the first data packet comprises the data packet sent to the terminal equipment; and the terminal equipment descrambles the third DCI based on the identifier of the terminal equipment to obtain the first data packet.

According to the data transmission method provided by the embodiment of the application, the terminal equipment can receive the data packet sent to the terminal equipment by the network equipment from the intermediate node, and then the terminal equipment can only monitor the signal sent by the intermediate node, so that the complexity of the terminal equipment is reduced.

With reference to the third aspect, in some implementations of the third aspect, before the terminal device receives the third DCI and the first data packet sent by the intermediate node, the method further includes: the terminal equipment receives the identifier of the terminal equipment sent by the intermediate node; or, the terminal device receives the identifier of the terminal device sent by the network device.

With reference to the third aspect, in certain implementations of the third aspect, the method further includes: and the terminal equipment receives first indication information sent by the intermediate node, wherein the first indication information is used for indicating that the identifier of the terminal equipment needs to be updated.

According to the data transmission method provided by the embodiment of the application, the identification of the terminal equipment can be updated, so that the identification of a plurality of terminal equipment is prevented from being collided.

In a fourth aspect, a method for data transmission is provided, where a network device sends data packets to N terminal devices via an intermediate node, and the method includes: the network equipment determines a second DCI and a second data packet, wherein the second DCI is processed through the identifier of the intermediate node, the second data packet comprises data packets sent to the N terminal equipment, and N is a positive integer; the network device sends the second DCI and the second packet to the intermediate node.

According to the data transmission method provided by the embodiment of the application, when the network equipment needs to send the data packet to the N terminal equipment, the data packet can be forwarded through the intermediate node, and then the N terminal equipment can only need to monitor the signal sent by the intermediate node, so that the complexity of the terminal equipment is reduced.

In one case, the processing of the second DCI referred to in this application via the identity of the intermediate node may comprise scrambling the second packet via the identity of the intermediate node.

A correspondence may exist between a second DCI sent by the network device to the intermediate node and the second data packet, where the second DCI is used for the intermediate node to obtain the second data packet.

With reference to the fourth aspect, in some implementations of the fourth aspect, before the network device determines the second DCI and the second packet, the method further includes: and the network equipment distributes the identifier of the intermediate node for the intermediate node.

In the data transmission method provided in the embodiment of the present application, the identifier of the intermediate node that scrambles the second DCI is configured for the intermediate node by the network device.

With reference to the fourth aspect, in some implementations of the fourth aspect, the second DCI further includes second indication information for indicating the N terminal devices; or the MAC header of the second packet is used to indicate the sizes of the data packets respectively sent to the N terminal devices from the N terminal devices and the second packet.

In the data transmission method provided in the embodiment of the present application, the second DCI or the MAC subheader of the second data packet indicates to which terminal devices the data in the second data packet is sent, so that the data packets that need to be sent to the N terminal devices in the second data packet can be smoothly sent to the N terminal devices

With reference to the fourth aspect, in certain implementations of the fourth aspect, the method further includes: the network equipment respectively allocates the identifiers of the N terminal equipments to the N terminal equipments; and the network equipment sends the identifiers of the N terminal equipment to the intermediate node.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the method further includes: and the network equipment receives the identifications of the N terminal equipments sent by the intermediate node.

In the data transmission method provided by the embodiment of the present application, the identifier of the terminal device may be configured by the network device or may be configured by the intermediate node. Flexible configuration schemes are provided.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the method further comprises: the network equipment sends a switching request to target network equipment, wherein the switching request is used for requesting the intermediate node and the N terminal equipment to be accessed to the target network equipment, and the switching request carries the identification of the N terminal equipment; the network device receives a handover response sent by the target network device, wherein the handover response includes third indication information, and the third indication information is used for indicating that the identifier of the terminal device in the N terminal devices needs to be updated; and the network equipment sends a switching command to the intermediate node, wherein the switching command is used for informing the intermediate node to access the target network equipment, and the switching command comprises the third indication information.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the method further comprises: and the network equipment receives connection failure indication information sent by the intermediate node, wherein the connection failure indication information is used for indicating the connection failure between the terminal equipment in the N terminal equipment and the intermediate node.

In a fifth aspect, a method for data transmission is provided, where a network device sends a data packet to N terminal devices via an intermediate node, and the method includes: the intermediate node receives a second DCI and a second data packet sent by the network equipment, the second DCI is processed through the identifier of the intermediate node, the first data packet comprises data packets sent to N pieces of terminal equipment, and N is a positive integer; the intermediate node descrambling the second DCI based on the identity of the intermediate node; the intermediate node determines to send the data in the second data packet to the N terminal devices respectively; and the intermediate node sends a fourth DCI and a third data packet to the terminal equipment, wherein the fourth DCI is processed through the identifier of the terminal equipment, and the third data packet comprises the data sent to the terminal equipment in the second data packet, and the terminal equipment is any one of the N pieces of terminal equipment.

According to the data transmission method provided by the embodiment of the application, when the network equipment needs to send the data packet to the terminal equipment, the data packet can be forwarded through the intermediate node, and then the terminal equipment only needs to monitor the signal sent by the intermediate node, so that the complexity of the terminal equipment is reduced.

It should be understood that reference in this application to the second DCI being processed via the identity of the intermediate node may be understood to mean that the second packet is scrambled via the identity of the intermediate node.

It should also be understood that there may be a correspondence between the second DCI sent by the network device to the intermediate node and the second data packet, i.e. the second DCI is used by the intermediate node to obtain the second data packet. Similarly, a corresponding relationship may exist between the fourth DCI sent by the intermediate node to the terminal device and the third data packet, that is, the fourth DCI is used by the terminal device to obtain the third data packet.

With reference to the fifth aspect, in some implementations of the fifth aspect, before the intermediate node receives the second DCI and the second data packet transmitted by the network device, the method further includes: the intermediate node receives the identifier of the intermediate node sent by the network equipment

With reference to the fifth aspect, in some implementations of the fifth aspect, the second DCI further includes second indication information for indicating the N terminal devices; the determining, by the intermediate node, to send the data in the second data packet to the N terminal devices respectively includes: and the intermediate node determines to send the data in the second data packet to the N terminal devices respectively according to the second indication information.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the MAC subheader of the second data packet is used to indicate sizes of the N terminal devices and data packets respectively sent to the N terminal devices in the second data packet; the determining, by the intermediate node, to send the data in the second data packet to the N terminal devices respectively includes: and the MAC layer of the intermediate node determines to respectively send the data in the second data packet to the N terminal devices according to the MAC header of the second data packet.

In the data transmission method provided in the embodiment of the application, since the second data packet includes data packets that need to be sent to the N terminal devices, the MAC subheader of the second DCI or the second data packet needs to indicate to which terminal devices the data in the second data packet is sent.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the method further comprises: the intermediate node respectively allocates the identifiers of the N terminal devices to the N terminal devices; the intermediate node sends the identifiers of the N terminal devices to the network device; or, the intermediate node receives the identifiers of the N terminal devices sent by the network device.

In the data transmission method provided in the embodiment of the present application, the identifier of the terminal device that scrambles the fourth DCI may be configured by the network device or configured by the intermediate node. Flexible configuration schemes are provided.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the method further comprises: and the intermediate node receives a handover command sent by the network device, wherein the handover command includes third indication information, and the third indication information is used for indicating that the identifier of the terminal device in the N terminal devices needs to be updated.

According to the data transmission method provided by the embodiment of the application, when the intermediate node and the terminal equipment are switched to the target network equipment, if the identifier of at least one terminal equipment in the N terminal equipment connected with the intermediate node conflicts with the identifier of the terminal equipment under the target network equipment, the target network equipment can indicate that the identifier of the terminal equipment to be switched is updated to other identifiers, so that the conflict with the identifier of the local terminal equipment is avoided.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the method further comprises: the method further comprises the following steps: and the intermediate node sends connection failure indication information to the network equipment, wherein the connection failure indication information is used for indicating the connection failure between the terminal equipment in the N terminal equipment and the intermediate node.

In a sixth aspect, a method for data transmission is provided, including: the terminal equipment receives fourth DCI and the third data packet sent by the intermediate node, the fourth DCI is processed through the identifier of the terminal equipment, and the third data packet comprises the data packet sent to the terminal equipment; and the terminal equipment descrambles the fourth DCI based on the identifier of the terminal equipment to obtain the third data packet.

With reference to the sixth aspect, in some implementations of the sixth aspect, before the terminal device receives the fourth DCI and the third data packet transmitted by the intermediate node, the method further includes: the terminal equipment receives the identifier of the terminal equipment sent by the intermediate node; or, the terminal device receives the identifier of the terminal device sent by the network device.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the method further comprises: and the terminal equipment receives third indication information sent by the intermediate node, wherein the third indication information is used for indicating that the identifier of the terminal equipment needs to be updated.

In a seventh aspect, a method of configuring an identity includes: a network device receives a first association request message sent by an intermediate node, wherein the first association request message is used for requesting the network device to configure an identifier for a terminal device; and the network equipment sends an association response message to the intermediate node, wherein the association response message comprises the identifier of the terminal equipment.

In the method for configuring an identifier provided in the embodiment of the present application, after receiving a first association request message from an intermediate node, a network device may configure an identifier for a terminal device, where the first association request message includes an identifier of the terminal device in a sidelink (SL UE ID).

It should be understood that the message for requesting the network device to configure the identifier for the terminal device is referred to as the first association request message in this application, which is only an example and does not limit the scope of the application in any way.

With reference to the seventh aspect, in certain implementations of the seventh aspect, the method further includes: and the network device sends the fourth indication information to the intermediate node, wherein the fourth indication information is used for indicating the intermediate node as a scheduling group head of at least one terminal device, and the scheduling group head is used for scheduling side link SL resources for the at least one terminal device.

In the method for configuring an identifier provided in the embodiment of the present application, the network device may indicate the intermediate node as a scheduling group head of the scheduling terminal device.

With reference to the seventh aspect, in certain implementations of the seventh aspect, before the network device determines the fourth indication information, the method further includes: the network device receives a request message sent by the intermediate node, where the request message is used to request the network device to set the intermediate node as the scheduling group head, or the request message is used to notify the network device that the intermediate node has the capability of the scheduling group head; or, the network device receives fifth indication information of a core network device, where the fifth indication information is used to indicate that the intermediate node is the scheduling group head.

In the method for configuring an identifier provided in the embodiment of the present application, a prerequisite that a network device indicates an intermediate node as a scheduling group head may be multiple, and a flexible determination scheme is provided for the network device to indicate the intermediate node as the scheduling group head.

With reference to the seventh aspect, in some implementations of the seventh aspect, the number of bits occupied by the identifier of the terminal device is less than 24.

In the method for configuring an identifier provided in the embodiment of the present application, the identifier length of the terminal device is smaller than the identifier length of the terminal device in the sidelink, so that an aim of reducing air interface overhead when the intermediate node schedules the terminal device in the sidelink is achieved.

In an eighth aspect, a method of configuring an identity, comprising: the method comprises the steps that an intermediate node sends a first association request message to network equipment, wherein the first association request message is used for requesting the network equipment to configure an identifier for terminal equipment; and the intermediate node receives an association response message sent by the network equipment, wherein the association response message comprises the identifier of the terminal equipment.

According to the method for configuring the identifier provided by the embodiment of the application, the network device may configure the identifier for the terminal device after receiving the first association request message of the intermediate node.

With reference to the eighth aspect, in certain implementations of the eighth aspect, the method further includes: before the intermediate node sends the first association request message to the network device, the method further comprises: and the intermediate node receives a second association request message sent by the terminal equipment, wherein the second association request message is used for requesting association to the intermediate node.

In the method for configuring an identifier provided in the embodiment of the present application, the intermediate node receives a second association request message from the terminal device, and learns that one or some terminal devices request to associate to the intermediate node, where the second association request message includes the SL ue id.

With reference to the eighth aspect, in some implementation manners of the eighth aspect, the intermediate node receives fourth indication information sent by the network device, where the fourth indication information is used to indicate that the intermediate node is used as a scheduling group header of at least one terminal device, and the scheduling group header is used to schedule sidelink SL resources for the at least one terminal device.

With reference to the eighth aspect, in some implementations of the eighth aspect, the intermediate node broadcasts a discovery message, where the discovery message is used to notify a terminal device, and the intermediate node is the scheduling group head.

In the method for configuring an identifier provided in the embodiment of the present application, the intermediate node notifies the terminal device itself as a scheduling group header in a broadcast manner.

With reference to the eighth aspect, in some implementations of the eighth aspect, the intermediate node sends a request message to the network device, where the request message is used to request the network device to set the intermediate node as the scheduling group head, or the request message is used to notify the network device that the intermediate node has the capability of the scheduling group head.

With reference to the eighth aspect, in some implementation manners of the eighth aspect, the intermediate node sends sixth indication information to a core network device, where the sixth indication information is used to indicate that the intermediate node is a high-level group head.

In the method for configuring the identifier provided in the embodiment of the present application, the prerequisite condition of the intermediate node for the scheduling group header may be multiple, and a flexible determination scheme is provided for determining the intermediate node for the scheduling group header for the network device.

With reference to the eighth aspect, in some implementations of the eighth aspect, the intermediate node sends the identity of the terminal device to the terminal device.

With reference to the eighth aspect, in some implementations of the eighth aspect, the number of bits occupied by the identifier of the terminal device is less than 24.

In a ninth aspect, a method of configuring an identity, comprises: and the terminal equipment sends a second association request message to the intermediate node, wherein the second association request message is used for requesting association to the intermediate node.

In the method for configuring an identifier provided in the embodiment of the present application, the terminal device sends a second association request message to the intermediate node, requesting association to the intermediate node, where the second association request message includes an SL UE ID.

With reference to the ninth aspect, in some implementation manners of the ninth aspect, the terminal device obtains the discovery message broadcast by the intermediate node, and determines that the intermediate node is a scheduling group head.

According to the method for configuring the identifier, the terminal device can acquire that the intermediate node is the scheduling group head of the scheduling terminal device.

With reference to the ninth aspect, in some implementations of the ninth aspect, the terminal device receives the identifier of the terminal device sent by the intermediate node.

With reference to the ninth aspect, in some implementations of the ninth aspect, the number of bits occupied by the identifier of the terminal device is less than 24.

In a tenth aspect, a method of configuring an identity, comprising: the network device determines fourth indication information, where the fourth indication information is used to indicate an intermediate node as a scheduling group header of a terminal device, and the scheduling group header is used to schedule a sidelink SL resource for the terminal device, where the fourth indication information includes an identifier set, and one identifier in the identifier set is an identifier of the terminal device; and the network equipment sends the fourth indication information to the intermediate node.

In the method for configuring the identifier provided in the embodiment of the present application, the network device may indicate the intermediate node as a scheduling group head, and allocate the identifier set in advance.

With reference to the tenth aspect, in some implementations of the tenth aspect, before the network device determines the fourth indication information, the method further includes: the network device receives a request message sent by the intermediate node, where the request message is used to request the network device to set the intermediate node as the scheduling group head, or the request message is used to notify the network device that the intermediate node has the capability of the scheduling group head; or, the network device receives fifth indication information of a core network device, where the fifth indication information is used to indicate that the intermediate node is the scheduling group head.

With reference to the tenth aspect, in some implementations of the tenth aspect, the identifier of the terminal device occupies less than 24 bits.

In an eleventh aspect, a method of configuring an identity, comprising: the method comprises the steps that an intermediate node receives fourth indication information sent by network equipment, wherein the fourth indication information is used for indicating the intermediate node as a scheduling group head of terminal equipment, the scheduling group head is used for scheduling Side Link (SL) resources for the terminal equipment, the fourth indication information comprises an identification set, and one identification in the identification set is an identification of the terminal equipment; and the intermediate node determines to schedule side uplink SL resources for the terminal equipment according to the fourth indication information.

With reference to the eleventh aspect, in certain implementations of the eleventh aspect, the method further comprises: and the intermediate node receives the second association request message sent by the terminal equipment, wherein the second association request message is used for requesting association to the intermediate node.

With reference to the eleventh aspect, in some implementations of the eleventh aspect, the intermediate node broadcasts a discovery message, the discovery message is used to notify a terminal device, and the intermediate node is the scheduling group head.

With reference to the eleventh aspect, in some implementations of the eleventh aspect, the intermediate node sends a request message to the network device, where the request message is used to request the network device to set the intermediate node to the scheduling group head, or the request message is used to notify the network device that the intermediate node has the capability of the scheduling group head.

With reference to the eleventh aspect, in some implementation manners of the eleventh aspect, the intermediate node sends sixth indication information to a core network device, where the sixth indication information is used to indicate that the intermediate node is an upper layer group header.

With reference to the eleventh aspect, in certain implementations of the eleventh aspect, the intermediate node sends the identity of the terminal device to the terminal device.

With reference to the eleventh aspect, in some implementations of the eleventh aspect, the identification of the terminal device occupies less than 24 bits.

In a twelfth aspect, a method of configuring an identity, includes: and the terminal equipment sends a second association request message to the intermediate node, wherein the second association request message is used for requesting association to the intermediate node.

In the method for configuring the identifier provided in the embodiment of the present application, the terminal device sends the second association request message to the intermediate node to request association to the intermediate node.

With reference to the twelfth aspect, in some implementation manners of the twelfth aspect, the terminal device obtains the discovery message broadcast by the intermediate node, and determines that the intermediate node is a scheduling group head.

With reference to the twelfth aspect, in some implementations of the twelfth aspect, the terminal device receives the identifier of the terminal device sent by the intermediate node.

With reference to the twelfth aspect, in some implementations of the twelfth aspect, the number of bits occupied by the identifier of the terminal device is less than 24.

In a thirteenth aspect, an apparatus for data transmission is provided, where a network device sends a data packet to a terminal device via an intermediate node, and the apparatus includes: the processing unit is used for determining first DCI and a first data packet, wherein the first DCI is processed through the identifier of the terminal equipment, and the first data packet comprises the data packet sent to the terminal equipment; and a sending unit, configured to send the first DCI and the first data packet to the intermediate node.

With reference to the thirteenth aspect, in some implementations of the thirteenth aspect, before the processing unit determines the first DCI and the first data packet, the processing unit is further configured to assign an identifier of the terminal device to the terminal device; and the sending unit is also used for sending the identifier of the terminal equipment to the intermediate node.

With reference to the thirteenth aspect, in certain implementations of the thirteenth aspect, before the processing unit determines the first DCI and the first data packet, the apparatus further includes: and the receiving unit is used for receiving the identifier of the terminal equipment sent by the intermediate node.

With reference to the thirteenth aspect, in some implementation manners of the thirteenth aspect, the sending unit is further configured to send a handover request to the target network device, where the handover request is used to request that the intermediate node and the terminal device access the target network device, and an identifier of the terminal device is carried in the handover request; the receiving unit is further configured to receive a handover response sent by the target network device, where the handover response includes first indication information, and the first indication information is used to indicate that an identifier of the terminal device needs to be updated; and the sending unit is further configured to send a handover command to the intermediate node, where the handover command is used to notify the intermediate node of accessing the target network device, and the handover command includes the first indication information.

With reference to the thirteenth aspect, in certain implementations of the thirteenth aspect, the receiving unit is further configured to receive connection failure indication information sent by the intermediate node, where the connection failure indication information is used to indicate a connection failure between the terminal device and the intermediate node.

The apparatus for data transmission provided in the thirteenth aspect and any possible implementation manner of the thirteenth aspect may be configured to perform the operations of the network device in the first aspect and any possible implementation manner of the first aspect. In particular, the means for data transmission (means) comprising means for performing the steps or functions described in the first aspect above and any possible implementation manner of the first aspect may be the network device or a chip or functional module inside the network device in the first aspect. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In a fourteenth aspect, an apparatus for data transmission is provided, including: a receiving unit, configured to receive a first DCI and a first data packet sent by a network device, where the first DCI is processed via an identifier of a terminal device, and the first data packet includes a data packet sent to the terminal device; the processing unit is used for descrambling the first DCI based on the identifier of the terminal equipment to obtain a first data packet; and the sending unit is used for sending a third DCI and the first data packet to the terminal equipment, and the third DCI is processed through the identifier of the terminal equipment.

With reference to the fourteenth aspect, in some implementations of the fourteenth aspect, before the receiving unit receives the first DCI and the first data packet sent by the network device, the processing unit is further configured to allocate an identifier of the terminal device to the terminal device; the sending unit sends the identifier of the terminal device to the network device.

With reference to the fourteenth aspect, in some implementations of the fourteenth aspect, before the network device determines the first DCI and the first data packet, the receiving unit is further configured to receive an identifier of the terminal device sent by the network device.

With reference to the fourteenth aspect, in some implementation manners of the fourteenth aspect, the receiving unit is further configured to receive a handover command sent by the network device, where the handover command is used to notify that the target network device is accessed, and the handover command includes first indication information, and the first indication information is used to indicate that the identifier of the terminal device needs to be updated.

With reference to the fourteenth aspect, in some implementations of the fourteenth aspect, the sending unit is further configured to send connection failure indication information to the network device, where the connection failure indication information is used to indicate that a connection between the terminal device and the intermediate node fails.

The apparatus for data transmission provided in the fourteenth aspect and any possible implementation manner of the fourteenth aspect may be configured to perform the operation of the intermediate node in the second aspect and any possible implementation manner of the second aspect. In particular, the means for data transmission (means) comprising means for performing the steps or functions described in the second aspect above and in any possible implementation of the second aspect may be an intermediate node in the second aspect or a chip or functional module inside the intermediate node. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In a fifteenth aspect, an apparatus for data transmission is provided, including: a receiving unit, configured to receive a third DCI sent by an intermediate node and the first data packet, where the third DCI is processed via an identifier of a terminal device, and the first data packet includes a data packet sent to the terminal device; and the processing unit is used for descrambling the third DCI based on the identifier of the terminal equipment to acquire the first data packet.

With reference to the fifteenth aspect, in some implementations of the fifteenth aspect, before the receiving unit receives the third DCI and the first data packet sent by the intermediate node, the receiving unit is further configured to receive an identifier of the terminal device sent by the intermediate node; or, the receiving unit is further configured to receive the identifier of the terminal device sent by the network device.

With reference to the fifteenth aspect, in some implementations of the fifteenth aspect, the receiving unit is configured to receive first indication information sent by the intermediate node, where the first indication information is used to indicate that the identifier of the terminal device needs to be updated.

The apparatus for data transmission provided in any possible implementation manner of the fifteenth aspect and the fifteenth aspect may be configured to perform the operations of the terminal device in any possible implementation manner of the third aspect and the third aspect. In particular, the means for data transmission (means) including the means for performing the steps or functions described in the third aspect and any possible implementation manner of the third aspect may be the terminal device or a chip or a functional module inside the terminal device in the third aspect. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In a sixteenth aspect, an apparatus for data transmission is provided, where a network device sends a data packet to N terminal devices via an intermediate node, and the apparatus includes: a processing unit, configured to determine a second DCI and a second data packet, where the second DCI is processed via an identifier of an intermediate node, the second data packet includes data packets sent to N terminal devices, and N is a positive integer; a sending unit, configured to send the second DCI and the second data packet to the intermediate node.

With reference to the sixteenth aspect, in certain implementations of the sixteenth aspect, before the processing unit determines the second DCI and the second packet, the processing unit is further configured to assign an identification of an intermediate node to the intermediate node.

With reference to the sixteenth aspect, in some implementations of the sixteenth aspect, the second DCI further includes second indication information for indicating the N terminal devices; or the MAC header of the second packet is used to indicate the sizes of the data packets respectively sent to the N terminal devices from the N terminal devices and the second packet.

With reference to the sixteenth aspect, in some implementations of the sixteenth aspect, the processing unit is further configured to allocate identifiers of the N terminal devices to the N terminal devices respectively; a sending unit, configured to send the identifiers of the N terminal devices to the intermediate node.

With reference to the sixteenth aspect, in certain implementations of the sixteenth aspect, the apparatus further comprises: a receiving unit, configured to receive the identifiers of the N terminal devices sent by the intermediate node.

With reference to the sixteenth aspect, in some implementations of the sixteenth aspect, the sending unit is configured to send a handover request to a target network device, where the handover request is used to request that the intermediate node and the N terminal devices access the target network device, and the handover request carries identifiers of the N terminal devices; a receiving unit, configured to receive a handover response sent by the target network device, where the handover response includes third indication information, and the third indication information is used to indicate that an identifier of a terminal device in the N terminal devices needs to be updated; a sending unit, configured to send a handover command to the intermediate node, where the handover command is used to notify the intermediate node to access the target network device, and the handover command includes the third indication information.

With reference to the sixteenth aspect, in some implementations of the sixteenth aspect, the receiving unit is configured to receive connection failure indication information sent by the intermediate node, where the connection failure indication information is used to indicate that a connection between a terminal device of the N terminal devices and the intermediate node fails.

The apparatus for data transmission provided in the sixteenth aspect and any possible implementation manner of the sixteenth aspect may be configured to perform the operations of the network device in the fourth aspect and any possible implementation manner of the fourth aspect. In particular, the means for data transmission (means) comprising means for performing the steps or functions described in the fourth aspect above and any possible implementation manner of the fourth aspect may be the network device or a chip or functional module inside the network device in the fourth aspect. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In a seventeenth aspect, an apparatus for data transmission is provided, where a network device sends a data packet to N terminal devices via an intermediate node, and the apparatus includes: a receiving unit, configured to receive a second DCI and a second data packet sent by a network device, where the second DCI is processed via an identifier of an intermediate node, the first data packet includes data packets sent to N terminal devices, and N is a positive integer; a processing unit to descramble the second DCI based on the identity of the intermediate node; the processing unit is used for determining that the data in the second data packet are respectively sent to the N terminal devices; a sending unit, configured to send a fourth DCI and a third data packet to a terminal device, where the fourth DCI is processed via an identifier of the terminal device, and the third data packet includes data sent to the terminal device in the second data packet, and the terminal device is any one of the N terminal devices.

With reference to the seventeenth aspect, in some implementations of the seventeenth aspect, before the receiving unit receives the second DCI and the second data packet transmitted by the network device, the receiving unit is further configured to receive an identification of the intermediate node transmitted by the network device

With reference to the seventeenth aspect, in some implementations of the seventeenth aspect, the second DCI further includes second indication information for indicating the N terminal devices; the determining, by the processing unit, that the data in the second data packet is respectively sent to the N terminal devices includes: and the sending unit determines to send the data in the second data packet to the N terminal devices respectively according to the second indication information.

With reference to the seventeenth aspect, in certain implementations of the seventeenth aspect, the MAC subheader of the second packet is used to indicate sizes of the N terminal devices and data packets respectively sent to the N terminal devices in the second packet; the determining, by the processing unit, that the data in the second data packet is respectively sent to the N terminal devices includes: and the sending unit determines to send the data in the second data packet to the N terminal devices respectively according to the MAC header of the second data packet.

With reference to the seventeenth aspect, in certain implementations of the seventeenth aspect, the apparatus further comprises: the processing unit respectively allocates the identifiers of the N terminal devices to the N terminal devices; the sending unit sends the identifiers of the N terminal devices to the network device; or, the receiving unit receives the identifiers of the N terminal devices sent by the network device.

With reference to the seventeenth aspect, in certain implementations of the seventeenth aspect, the apparatus further comprises: the receiving unit receives a handover command sent by the network device, where the handover command includes third indication information, and the third indication information is used to indicate that an identifier of a terminal device in the N terminal devices needs to be updated.

With reference to the seventeenth aspect, in certain implementations of the seventeenth aspect, the apparatus further comprises: the device further comprises: the sending unit sends connection failure indication information to the network device, where the connection failure indication information is used to indicate that a connection between a terminal device of the N terminal devices and the intermediate node fails.

The apparatus for data transmission provided in the seventeenth aspect and any possible implementation manner of the seventeenth aspect may be configured to perform the operations of the intermediate node in the fifth aspect and any possible implementation manner of the fifth aspect. In particular, the means for data transmission (means) comprising means for performing the steps or functions described in the fifth aspect above and in any possible implementation of the fifth aspect may be an intermediate node or a chip or functional module inside an intermediate node in the fifth aspect. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In an eighteenth aspect, an apparatus for data transmission is provided, including: a receiving unit, configured to receive a fourth DCI and the third data packet sent by an intermediate node, where the fourth DCI is processed via an identifier of the terminal device, and the third data packet includes a data packet sent to the terminal device; and the processing unit is used for descrambling the fourth DCI based on the identifier of the terminal equipment to acquire the third data packet.

With reference to the eighteenth aspect, in some implementations of the eighteenth aspect, before the receiving unit receives the fourth DCI and the third data packet sent by the intermediate node, the receiving unit is further configured to receive an identifier of the terminal device sent by the intermediate node; or, the receiving unit receives the identifier of the terminal device sent by the network device.

With reference to the eighteenth aspect, in some implementations of the eighteenth aspect, the receiving unit receives third indication information sent by the intermediate node, where the third indication information is used to indicate that the identifier of the terminal device needs to be updated.

The apparatus for data transmission provided in the eighteenth aspect and any possible implementation manner of the eighteenth aspect may be used to perform the operations of the terminal device in the sixth aspect and any possible implementation manner of the sixth aspect. In particular, the means for data transmission (means) including the means for performing the steps or functions described in the sixth aspect and any possible implementation manner of the sixth aspect may be the terminal device or a chip or functional module inside the terminal device in the sixth aspect. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In a nineteenth aspect, an apparatus for configuring an identity, comprising: a receiving unit, configured to receive a first association request message sent by an intermediate node, where the first association request message is used to request the network device to configure an identifier for a terminal device; a sending unit, configured to send an association response message to the intermediate node, where the association response message includes an identifier of the terminal device.

With reference to the nineteenth aspect, in some implementations of the nineteenth aspect, the sending unit sends the fourth indication information to the intermediate node, where the fourth indication information is used to indicate that the intermediate node is a scheduling group header of at least one terminal device, and the scheduling group header is used to schedule sidelink SL resources for the at least one terminal device.

With reference to the nineteenth aspect, in some implementations of the nineteenth aspect, before the processing unit determines the fourth indication information, the receiving unit is further configured to receive a request message sent by the intermediate node, where the request message is used to request the processing unit to set the intermediate node as the scheduling group header, or the request message is used to notify the network device that the intermediate node has the capability of the scheduling group header; or, the receiving unit receives fifth indication information of a core network device, where the fifth indication information is used to indicate that the intermediate node is the scheduling group head.

With reference to the nineteenth aspect, in some implementations of the nineteenth aspect, the number of bits occupied by the identifier of the terminal device is less than 24.

The apparatus for data transmission provided in any possible implementation manner of the nineteenth aspect and the nineteenth aspect may be configured to perform the operations of the network device in any possible implementation manner of the seventh aspect and the seventh aspect. Specifically, the means for data transmission includes corresponding components (means) for performing the steps or functions described in the seventh aspect and any possible implementation manner of the seventh aspect, which may be a network device in the seventh aspect or a chip or a functional module inside the network device. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In a twentieth aspect, an apparatus for configuring an identity, comprises: a sending unit, configured to send a first association request message to a network device, where the first association request message is used to request the network device to configure an identifier for a terminal device; a receiving unit, configured to receive an association response message sent by the network device, where the association response message includes an identifier of the terminal device.

With reference to the twentieth aspect, in some implementations of the twentieth aspect, before the sending unit sends the first association request message to the network device, the receiving unit is further configured to receive the first association request message sent by the terminal device, where the first association request message is used to request association to the intermediate node.

With reference to the twentieth aspect, in some implementations of the twentieth aspect, the receiving unit receives fourth indication information sent by the network device, where the fourth indication information is used to indicate that an intermediate node is a scheduling group header of at least one terminal device, and the scheduling group header is used to schedule sidelink SL resources for the at least one terminal device.

With reference to the twentieth aspect, in certain implementations of the twentieth aspect, the sending unit broadcasts a discovery message, the discovery message is used to notify a terminal device, and the intermediate node is the scheduling group head.

With reference to the twentieth aspect, in some implementations of the twentieth aspect, the sending unit sends, to the network device, a request message for requesting the network device to set the intermediate node to the scheduling group head, or the request message is used to notify the network device that the intermediate node has the capability of the scheduling group head.

With reference to the twentieth aspect, in some implementation manners of the twentieth aspect, the sending unit sends sixth indication information to a core network device, where the sixth indication information is used to indicate that the intermediate node is an upper layer group head.

With reference to the twentieth aspect, in some implementations of the twentieth aspect, the sending unit sends the identification of the terminal device to the terminal device.

With reference to the twentieth aspect, in certain implementations of the twentieth aspect, the identification of the terminal device occupies less than 24 bits.

The apparatus for data transmission provided in the twentieth aspect and any possible implementation manner of the twentieth aspect may be configured to perform the operations of the intermediate node in the eighth aspect and any possible implementation manner of the eighth aspect. In particular, the means for data transmission (means) comprising means for performing the steps or functions described in the above-mentioned eighth aspect and any possible implementation manner of the eighth aspect may be an intermediate node or a chip or a functional module inside the intermediate node in the eighth aspect. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In a twenty-first aspect, an apparatus for configuring an identity, comprises: a sending unit, configured to send a second association request message to an intermediate node, where the second association request message is used to request association to the intermediate node.

With reference to the twenty-first aspect, in certain implementations of the twenty-first aspect, the apparatus further comprises: and the receiving unit is used for acquiring the discovery message broadcast by the intermediate node and determining that the intermediate node is a scheduling group head.

With reference to the twenty-first aspect, in some implementations of the twenty-first aspect, the receiving unit receives an identifier of the terminal device sent by the intermediate node.

With reference to the twenty-first aspect, in some implementations of the twenty-first aspect, the identifier of the terminal device occupies less than 24 bits.

The apparatus for data transmission provided in the twenty-first aspect and any possible implementation manner of the twenty-first aspect may be used to perform the operations of the terminal device in the ninth aspect and any possible implementation manner of the ninth aspect. In particular, the means for data transmission (means) including the means for performing the steps or functions described in the above ninth aspect and any possible implementation manner of the ninth aspect may be the terminal device or a chip or functional module inside the terminal device in the ninth aspect. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In a twenty-second aspect, an apparatus for configuring an identity, comprises: a processing unit, configured to determine fourth indication information, where the fourth indication information is used to indicate an intermediate node as a scheduling group header of a terminal device, and the scheduling group header is used to schedule a sidelink SL resource for the terminal device, where the fourth indication information includes an identifier set, and one identifier in the identifier set is an identifier of the terminal device; a sending unit, configured to send the fourth indication information to the intermediate node.

With reference to the twenty-second aspect, in certain implementations of the twenty-second aspect, before the processing unit determines the fourth indication information, the apparatus further includes: a receiving unit, configured to receive a request message sent by the intermediate node, where the request message is used to request the network device to set the intermediate node as the scheduling group header, or the request message is used to notify the network device that the intermediate node has the capability of the scheduling group header; or, the receiving unit receives fifth indication information of a core network device, where the fifth indication information is used to indicate that the intermediate node is the scheduling group head.

With reference to the twenty-second aspect, in some implementations of the twenty-second aspect, the number of bits occupied by the identity of the terminal device is less than 24.

The apparatus for data transmission provided in the twenty-second aspect and any possible implementation manner of the twenty-second aspect may be configured to perform operations of the network device in the tenth aspect and any possible implementation manner of the tenth aspect. In particular, the means for data transmission (means) including the corresponding means for performing the steps or functions described in the tenth aspect and any possible implementation manner of the tenth aspect may be the network device or a chip or functional module inside the network device in the tenth aspect. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In a twenty-third aspect, an apparatus for configuring an identity, comprises: a receiving unit, configured to receive fourth indication information sent by a network device, where the fourth indication information is used to indicate an intermediate node as a scheduling group header of a terminal device, and the scheduling group header is used to schedule a sidelink SL resource for the terminal device, where the fourth indication information includes an identifier set, and one identifier in the identifier set is an identifier of the terminal device; and the processing unit is used for determining to schedule side link SL resources for the terminal equipment according to the fourth indication information.

With reference to the twenty-third aspect, in certain implementations of the twenty-third aspect, the receiving unit receives the second association request message sent by the terminal device, where the second association request message is used to request association to the intermediate node.

With reference to the twenty-third aspect, in certain implementations of the twenty-third aspect, the apparatus further includes: a sending unit, configured to broadcast a discovery message, where the discovery message is used to notify a terminal device, and the intermediate node is the scheduling group head.

With reference to the twenty-third aspect, in some implementations of the twenty-third aspect, the sending unit sends, to the network device, a request message, where the request message is used to request the network device to set the intermediate node to the scheduling group head, or the request message is used to notify the network device that the intermediate node has the capability of the scheduling group head.

With reference to the twenty-third aspect, in some implementation manners of the twenty-third aspect, the sending unit sends sixth indication information to a core network device, where the sixth indication information is used to indicate that the intermediate node is an upper layer group head.

With reference to the twenty-third aspect, in some implementations of the twenty-third aspect, the sending unit sends the identity of the terminal device to the terminal device.

With reference to the twenty-third aspect, in some implementations of the twenty-third aspect, the number of bits occupied by the identity of the terminal device is less than 24.

The apparatus for data transmission provided in any possible implementation manner of the twenty-third aspect and the twenty-third aspect may be configured to perform an operation of the intermediate node in any possible implementation manner of the eleventh aspect and the eleventh aspect. In particular, the means for data transmission (means) comprising means for performing the steps or functions described in the above eleventh aspect and any possible implementation manner of the eleventh aspect may be an intermediate node or a chip or functional module inside the intermediate node in the eleventh aspect. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In a twenty-fourth aspect, an apparatus for configuring an identity, comprises: a sending unit, configured to send a second association request message to an intermediate node, where the second association request message is used to request association to the intermediate node.

With reference to the twenty-fourth aspect, in certain implementations of the twenty-fourth aspect, the apparatus further comprises: and the receiving unit is used for determining the intermediate node as a scheduling group head by acquiring the discovery message broadcasted by the intermediate node.

With reference to the twenty-fourth aspect, in some implementations of the twenty-fourth aspect, the terminal device receives an identifier of the terminal device sent by the intermediate node.

With reference to the twenty-fourth aspect, in some implementations of the twenty-fourth aspect, the number of bits occupied by the identity of the terminal device is less than 24.

The apparatus for data transmission provided in any possible implementation manner of the twenty-fourth aspect and the twenty-fourth aspect may be configured to perform the operations of the terminal device in any possible implementation manner of the twelfth aspect and the twelfth aspect. In particular, the means for data transmission (means) including the means for performing the steps or functions described in the above twelfth aspect and any possible implementation manner of the twelfth aspect may be the terminal device or a chip or functional module inside the terminal device in the twelfth aspect. The steps or functions may be implemented by software, or hardware, or by a combination of hardware and software.

In a twenty-fifth aspect, there is provided a communication device comprising a processor, a transceiver, and a memory, wherein the memory is used for storing a computer program, the transceiver is used for executing the transceiving steps in the method for data transmission in any one of the possible implementations of the first to twelfth aspects, and the processor is used for calling and executing the computer program from the memory, so that the communication device executes the method for data transmission in any one of the possible implementations of the first to twelfth aspects.

Optionally, there are one or more processors and one or more memories.

Alternatively, the memory may be integrated with the processor, or provided separately from the processor.

Optionally, the transceiver comprises a transmitter (transmitter) and a receiver (receiver).

In one possible design, a communication device is provided that includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to invoke and execute the computer program from the memory, so that the communication device performs the method of the first aspect, the fourth aspect, the seventh aspect, and the tenth aspect, and any possible implementation manner of the first aspect, the fourth aspect, the seventh aspect, and the tenth aspect.

In another possible design, a communication device is provided that includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to invoke and execute the computer program from the memory, so that the communication device performs the method of the second, fifth, eighth, and eleventh aspects and any possible implementation manner of the second, fifth, eighth, and eleventh aspects.

In yet another possible design, a communication device is provided that includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to retrieve from the memory and execute the computer program, so that the communication device performs the method of the third aspect, the sixth aspect, the ninth aspect, and the twelfth aspect, and any possible implementation manner of the third aspect, the sixth aspect, the ninth aspect, and the twelfth aspect.

In a twenty-sixth aspect, there is provided a system comprising the apparatus for data transmission provided in the thirteenth to twenty-fourth aspects.

In a twenty-seventh aspect, there is provided a computer program product comprising: computer program (also called code, or instructions), which when executed, causes a computer to perform the method of any of the possible implementations of the first to twelfth aspects described above.

A twenty-eighth aspect provides a computer-readable medium storing a computer program (which may also be referred to as code, or instructions) which, when run on a computer, causes the computer to perform the method of any one of the possible implementations of the first to twelfth aspects described above.

In a twenty-ninth aspect, a chip system is provided, which includes a memory for storing a computer program and a processor for calling and running the computer program from the memory, so that a communication device in which the chip system is installed executes the method in any one of the possible implementation manners of the first to twelfth aspects.

Drawings

Fig. 1 is a schematic diagram of a system 100 to which the method for data transmission according to the embodiment of the present application can be applied.

FIG. 2 is a schematic diagram of an industrial control process.

FIG. 3 is a schematic diagram of another industrial control process.

FIG. 4 is a schematic diagram of another industrial control process.

FIG. 5 is a schematic diagram of another industrial control process.

Fig. 6 is a schematic flow chart of a method of data transmission provided in an embodiment of the present application.

Fig. 7 is a schematic diagram of a protocol stack according to an embodiment of the present application.

Fig. 8 is a schematic flow chart of another method of data transmission provided in an embodiment of the present application.

Fig. 9 is a schematic diagram of a second data packet structure according to an embodiment of the present application.

Fig. 10 (a) and (b) are schematic diagrams of another second data packet structure provided in this embodiment of the present application.

Fig. 11 is a schematic diagram of processing a second packet by the MAC layer of an intermediate node according to an embodiment of the present application.

Fig. 12 is a schematic diagram of a data packet sent by an intermediate node to a terminal device according to an embodiment of the present application.

Fig. 13 is a schematic flowchart of a handover network device according to an embodiment of the present application.

Fig. 14 is a schematic flowchart of a connection failure of a terminal device according to an embodiment of the present application.

Fig. 15 is a schematic diagram of a method for configuring an identifier according to an embodiment of the present application.

Fig. 16 is a schematic diagram of another configuration identification method provided in an embodiment of the present application.

Fig. 17 is a schematic diagram of the data transmission apparatus 10 proposed in the present application.

Fig. 18 is a schematic structural diagram of a terminal device 20 suitable for use in an embodiment of the present application.

Fig. 19 is a schematic diagram of a device 30 for data transmission proposed in the present application.

Fig. 20 is a schematic structural diagram of a network device 40 suitable for use in an embodiment of the present application.

Fig. 21 is a schematic diagram of a device 50 for data transmission proposed in the present application.

Fig. 22 is a schematic structural diagram of an intermediate node 60 suitable for use in an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: fifth generation (5G) system, New Radio (NR).

A terminal device in the embodiments of the present application may refer to a user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a relay station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capability, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), etc. Specifically, the method for data transmission provided by the embodiment of the present application can be applied in an industrial control scenario, and the terminal device referred to in the present application may be a device, such as an operation arm, that executes an industrial process in industrial control. The embodiments of the present application do not limit this.

The intermediate node in the embodiment of the present application may be any device with a wireless transceiving function for communicating with the terminal device. The device includes, but is not limited to, the above terminal device, relay node, local control node, control center, and the like, which include functions of an application layer and an access layer.

The network device in the embodiment of the present application may be any device with a wireless transceiving function for communicating with a terminal device. Such devices include, but are not limited to: a Home base station (e.g., Home evolved NodeB, or Home NodeB, HNB), a BaseBand Unit (BBU), an Access Point (AP), a Wireless relay node, a Wireless backhaul node, a Transmission Point (TP), or a Transmission and Reception Point (TRP) in a Wireless Fidelity (WIFI) system, and the like, and may also be 5G, such as NR, a gNB in the system, or a transmission Point (TRP or TP), one or a group (including multiple antenna panels) of antenna panels of an Access network device in the 5G system, or may also be a network node forming the gNB or the transmission Point, such as a BaseBand Unit (BBU), or a Distributed Unit (DU), and the like.

In some deployments, the gNB may include a Centralized Unit (CU) and a DU. The gNB may further include an Active Antenna Unit (AAU). The CU implements part of the function of the gNB and the DU implements part of the function of the gNB. For example, a CU implements functions of a Radio Resource Control (RRC) layer and a Packet Data Convergence Protocol (PDCP) layer. The DU implements functions of a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a Physical (PHY) layer. The AAU implements part of the physical layer processing functions, radio frequency processing and active antenna related functions. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, the higher layer signaling, such as the RRC layer signaling, may also be considered to be transmitted by the DU or by the DU + AAU under this architecture. It is to be understood that the network device may be a device comprising one or more of a CU node, a DU node, an AAU node. In addition, the CU may be divided into network devices in an access network (RAN), which is not limited in this application.

In the embodiment of the application, the terminal device or the network device or the intermediate node includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a Central Processing Unit (CPU), a Memory Management Unit (MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processing through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address list, word processing software, instant messaging software and the like. Furthermore, the embodiment of the present application does not particularly limit the specific structure of the execution main body of the method provided by the embodiment of the present application, as long as the communication can be performed according to the method provided by the embodiment of the present application by running the program recorded with the code of the method provided by the embodiment of the present application, for example, the execution main body of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module capable of calling the program and executing the program in the terminal device or the network device.

In addition, various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disk, floppy disk, or magnetic tape), optical disks (e.g., Compact Disk (CD), Digital Versatile Disk (DVD), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROM), card, stick, or key drive, etc.). In addition, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable storage medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

Fig. 1 is a schematic diagram of a system 100 to which the method for data transmission according to the embodiment of the present application can be applied. Including terminal device 101, network device 102, and intermediate node 103.

As shown in fig. 1, network device 102 may include 1 antenna or multiple antennas. Such as

antennas

104, 106, 108, 110, 112, and 114. Additionally, network device 102 may additionally include: a transmitter chain and a receiver chain.

It will be appreciated by those of ordinary skill in the art that the transmitter and receiver chains can each comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.).

Network device 102 may communicate with intermediate node 103. However, it is understood that network device 102 may communicate with any number of intermediate nodes similar to intermediate node 103.

As shown in fig. 1, intermediate node 103 communicates with network device 102 via

antennas

112 and 114. Where

antennas

112 and 114 transmit information to intermediate node 103 over a forward link (also called a downlink) 118 and receive information from intermediate node 103 over a reverse link (also called an uplink) 1720.

Further, terminal device 101 communicates with network device 102 through

antennas

104 and 106. Where

antennas

104 and 106 transmit information to terminal device 101 over forward link 124 and receive information from terminal device 101 over reverse link 126.

For example, in a Frequency Division Duplex (FDD) system. For example, forward link 118 can utilize a different frequency band than reverse link 1720, and forward link 124 can utilize a different frequency band than reverse link 126.

As another example, in Time Division Duplex (TDD) systems and full duplex (full duplex) systems, forward link 118 and reverse link 1720 may use a common frequency band and forward link 124 and reverse link 126 may use a common frequency band.

Each antenna (or group of antennas consisting of multiple antennas) and/or area designed for communication is referred to as a sector of network device 102.

For example, antenna groups may be designed to communicate to terminal devices in a sector of the areas covered by network device 102. A network device may transmit signals to all terminal devices in its corresponding sector through single-antenna or multi-antenna transmit diversity. During communication by network device 102 with terminal devices 116 and 122 over

forward links

118 and 124, respectively, the transmitting antennas of network device 102 may also utilize beamforming to improve signal-to-noise ratio of

forward links

118 and 124.

Moreover, mobile devices in neighboring cells can experience less interference when network device 102 utilizes beamforming to transmit to terminal devices 116 and 122 scattered randomly through an associated coverage area, as compared to a manner in which the network device transmits signals to all of its terminal devices through single-antenna or multi-antenna transmit diversity.

At a given time, the network device 102, the terminal device 101 and the intermediate node 103 may be wireless communication transmitting means and/or wireless communication receiving means. When sending data, the wireless communication sending device may encode the data for transmission. Specifically, the wireless communication transmitting device may obtain (e.g., generate, receive from other communication devices, or save in memory, etc.) a number of data bits to be transmitted over the channel to the wireless communication receiving device. Such data bits may be contained in a transport block (or transport blocks) of data, which may be segmented to produce multiple code blocks.

Similarly, the intermediate node 103 included in the system 100, similar to the network device 102 described above, may include 1 antenna or multiple antennas. The intermediate node 103 may communicate with the terminal device 101. Specifically, the communication process is similar to the communication process between the network device 102 and the terminal device, and is not described here again.

Moreover, the communication system 100 may be a PLMN network, a D2D network, an M2M network, an IoT network, or other networks, fig. 1 is a simplified schematic diagram of an example, and the communication system shown in fig. 1 may further include other network devices and/or other terminal devices, which are not shown in fig. 1 for simplicity. For example, the communication system shown in fig. 1 may be a network device communicating with a plurality of terminal devices, i.e. a single network device may transmit data or control signaling to a single or a plurality of terminal devices; alternatively, the communication system shown in fig. 1 may be a plurality of network devices communicating with one terminal device, that is, a plurality of network devices may also transmit data or control signaling for a single terminal device at the same time.

It should be understood that fig. 1 is only a simple schematic diagram for illustrating a scenario in which the method for data transmission provided in the embodiment of the present application is applicable, and does not constitute any limitation to the present application. To facilitate understanding of the method of data transmission provided in the embodiments of the present application, a brief description of a data transmission model in an industrial control network referred to in the present application is provided below with reference to fig. 2 to 5.

FIG. 2 is a schematic diagram of an industrial control process. For industrial control, the action instructions for each production run are predictable. As shown in fig. 2, ten actions are required when the control Center (CN) notifies the operation arm to machine a part, the control center notifies the operation arm to complete the ten actions, and after the ten actions are completed, the work of machining one part is finished; the control center starts to inform the operation arm to process the next part, and then the control center sends ten messages to inform the operation arm to complete ten actions and process another part. As can be seen from the above, the signaling transmitted by the wireless network is very regular for industrial control. In order to reduce the data transmission quantity between the control center and the base station, the NodeX is introduced and informs the terminal equipment of completing the ten actions. As shown in fig. 3. FIG. 3 is a schematic diagram of another industrial control process.

In FIG. 3, NodeX knows in advance that ten actions are required to complete a part. The control center only needs to inform the base station: please process the part; after the base station receives the instruction, the base station notifies the NodeX: please process the part; after receiving the instruction, NodeX decomposes the instruction into ten actions, generates ten messages and sends the ten messages to the operation arm. By adopting the mode, the NodeX can be deployed to be closer to the operation arm, so that a large amount of data transmission is carried out between the NodeX and the operation arm, and the distance between the NodeX and the operation arm is closer, thereby saving wireless resources and reducing the power of data transmission.

However, the industrial control flow shown in fig. 3 requires the operation arm to receive only data from the node x, and not directly from the base station. In fact, the base station still has some data to be passed directly to the operating arm. For such data, forwarding via NodeX is required, as indicated by the dashed flow in fig. 4 for data transmission. FIG. 4 is a schematic diagram of another industrial control process. Generally, such data is relatively urgent data, and the requirement on time delay is relatively high, for example, when an emergency occurs, the control center notifies the operation arm to stop operating. The processing of such forwarding-type data is mainly performed in the manner shown in fig. 5 in order to ensure that the delay requirement is met. FIG. 5 is a schematic diagram of another industrial control process. The network device in the industrial control process shown in fig. 5 needs to know the RNTI of the terminal device, the frequency point used for data transmission between the network device and the terminal device is different from the frequency point used for data transmission between the node x and the terminal device, and the network device can directly send data to the terminal device without forwarding through the node x, thereby achieving the purpose of reducing the time delay. Under the condition, the terminal equipment needs to respectively realize the communication with the NodeX and the communication with the network equipment through two different frequency points, so that the complexity of the terminal equipment is increased, and the price of the terminal equipment is improved.

The method aims to overcome the defects of data transmission between network equipment and terminal equipment in the existing industrial control process. The application provides a data transmission method.

The method for data transmission provided in the embodiments of the present application is described in detail below with reference to fig. 6 to 14

Fig. 6 is a schematic flow chart of a method of data transmission provided in an embodiment of the present application. The method of data transmission shown in fig. 6 is described below from an interactive perspective.

It should be understood that the method for data transmission provided in fig. 6 can be applied to the industrial control network, in which data transmission is required between a network device and a terminal device, and the data is sent to the terminal device via an intermediate node.

When the network device in fig. 6 has data to send to the terminal device, the data is forwarded to the terminal device through the intermediate node. The end device need only receive packets from the intermediate node and need not receive both packets from the intermediate node and from the network device. For the terminal equipment, the complexity of the terminal equipment is reduced.

The data transmission method comprises the following steps:

s610, the network device determines first Downlink Control Information (DCI) and a first data packet.

Specifically, when the network device has data to transmit to the terminal device, the network device packetizes the data to be transmitted to the terminal device into a first packet, and the first packet may be obtained based on the first DCI. The first DCI is processed via the identifier of the terminal device, or the first DCI may be scrambled via the identifier of the terminal device.

Illustratively, the above-mentioned network device packetizes the data to be transmitted to the terminal device into the first data packet includes the following possible cases:

1) the network device needs to send a plurality of data packets to the terminal device, and the plurality of data packets are packed into a first data packet and forwarded to the terminal device via the intermediate node.

For example, the network device needs to transmit the data packet #1 and the data packet #2 to the terminal device, and the network device may packetize the data packet #1 and the data packet #2 into the first data packet described above.

2) The network device needs to send a data packet to the terminal device, and if the size of the data packet exceeds the air interface transmission capability between the network device and the intermediate node, the network device transmits the data packet in segments, where the first data packet includes a part of data in the data packet.

For example, the network device needs to send the data packet #1 to the terminal device, where the size of the data packet #1 is 200 bits, but the air interface transmission capability between the network device and the intermediate node is 100 bits at a time, the network device may transmit the data packet #1 to the terminal device in a segmented manner, pack 100 bits in the data packet #1 into a first data packet, and pack the other 100 bits in the data packet #1 into another first data packet.

It should be understood that the first DCI described above is used for the intermediate node to acquire the first data packet described above, i.e., the first DCI corresponds to the first data packet. All the information needs to be sent to the intermediate node, S620 is executed, and the network device sends the first DCI and the first data packet to the intermediate node.

Specifically, the first DCI is sent to the intermediate node through a Physical Downlink Control Channel (PDCCH); the first packet is transmitted to the intermediate node through a Physical Downlink Shared Channel (PDSCH).

After receiving the first DCI and the first data packet, the intermediate node may descramble the first DCI, thereby obtaining the first data packet. Specifically, in the embodiment shown in fig. 6, the intermediate node knows the identifier of the terminal device through the following two possible schemes:

The first scheme is as follows: if the intermediate node learns the identifier of the terminal device from the network device, the method flow shown in fig. 6 further includes S611, where the network device allocates the identifier of the terminal device to the terminal device.

Specifically, the terminal device may directly obtain its own identifier from the network device through Random Access (RA) or other procedures, and how the terminal device obtains its own identifier is not limited in this application.

Further, after the network device allocates the identifier of the terminal device to the terminal device, in order to enable the intermediate node to acquire the identifier of the terminal device connected to the intermediate node, the method flow shown in fig. 6 further includes S612, where the network device sends the identifier of the terminal device to the intermediate node. The network equipment can know to inform the identifier of the terminal equipment to the intermediate node through the pre-configuration information; or, the network device may also learn, through a measurement report reported by the terminal device, that the terminal device is closest to the intermediate node, and notify the intermediate node of the identifier of the terminal device.

After performing the above S611 and S612, the intermediate node can know the identifier of the terminal device, and then after the intermediate node receives the first DCI and the first data packet, the intermediate node may descramble the first DCI using the identifier of the terminal device to obtain the first data packet.

It should be understood that fig. 6 is only illustrated by taking an example that one terminal device is connected to an intermediate node, and in practical applications, a plurality of terminal devices may be connected to one intermediate node, and a network device may transmit data to the plurality of terminal devices connected to the intermediate node through the intermediate node. Then the network device may assign the identifiers of the terminal devices to the plurality of terminal devices in S611 described above. For the intermediate node, when the scheme shown in fig. 6 is adopted, in general, several terminal devices are accessed through the intermediate node, and the intermediate node needs to receive downlink data from the network device by using the identifiers of the several terminal devices. In the wireless interface between the intermediate node and the network device, the search spaces corresponding to the identifiers of the terminal devices may be the same or different, which is not limited in the present application.

Scheme II: if the intermediate node allocates the identifier of the terminal device to the terminal device and notifies the network device of the identifier of the terminal device, the method shown in fig. 6 further includes S613, where the intermediate node allocates the identifier of the terminal device to the terminal device.

Further, after the intermediate node allocates the identifier of the terminal device to the terminal device, in order to enable the network device to acquire the identifier of the terminal device, the method flow shown in fig. 6 further includes S614, in which the intermediate node sends the identifier of the terminal device to the network device.

For example, if the actions performed by a plurality of terminal devices connected by the intermediate node are always the same, the plurality of terminal devices may be assigned the same identification of the terminal device, in which case the network device may transmit data to the plurality of terminal devices via the intermediate node at the same time.

Further, after the intermediate node receives the first DCI and the first data packet, the intermediate node descrambles the first DCI to obtain the first data packet, that is, S630 is performed.

Specifically, in S612, the network device may send the identifiers of the plurality of terminal devices to the intermediate node, or in S613, the intermediate node may assign the identifiers of the terminal devices to the plurality of terminal devices. At this time, after the intermediate node receives the first DCI and the first data packet, the intermediate node may descramble the first DCI using the known identifiers of the multiple terminal devices, respectively, until the first DCI is descrambled correctly.

For example, the network device to which 2 terminal devices (terminal device #1 and terminal device #2) are connected to the intermediate node needs to transmit the first DCI #1 and the first packet #1 to the terminal device #1 and the first DCI #2 and the first packet #2 to the terminal device #2, respectively. The network device may assign the terminal device id #1 and the terminal device id #2 to the terminal device #1 and the terminal device #2, respectively, in S611 described above, and the network device may notify the intermediate node of the terminal device id #1 and the terminal device id #2 in S612. When the intermediate node receives the first DCI #1 and the first data packet #1, the first DCI #1 is descrambled based on the identifier #1 of the terminal equipment and the identifier #2 of the terminal equipment respectively, wherein the first DCI #1 can be descrambled successfully based on the identifier #1 of the terminal equipment, and the first data packet #1 is obtained.

It should be appreciated that in the embodiment shown in FIG. 6, the intermediate node does not parse the first packet. Specifically, after receiving the first DCI and the first data packet, the intermediate node reads the first DCI on the PDCCH, descrambles the first DCI, and when descrambling the first DCI using the identifier of the terminal device is successful, knows that the first data packet corresponding to the first DCI is the terminal device corresponding to the identifier of the terminal device, directly sends the first data packet to the terminal device, and executes S640, the intermediate node sends the third DCI and the first data packet to the terminal device, and the third DCI is scrambled via the identifier of the terminal device. In the embodiment of the present application, the name of the control information sent by the intermediate node to the terminal device is not limited, but only the control information is limited to be scrambled by the identifier of the terminal device. The control information in the present application may be carried by a physical control channel, and includes functions such as uplink and downlink resource allocation. In the embodiment of the application, after the control information is descrambled correctly, the data packet can be received correctly. A packet may also be referred to herein as a Transport Block (TB). After receiving the third DCI and the first data packet, the terminal device descrambles the third DCI based on its own identifier, and acquires the first data packet, that is, S641 is further included in the embodiment shown in fig. 6, and the terminal device acquires the first data packet.

For example, in the processes of S610 to S640, the protocol stack in the intermediate node is as shown in fig. 7, and fig. 7 is a schematic diagram of a protocol stack provided in this embodiment of the present application. As can be seen from fig. 7, after receiving the TB sent by the network device, the intermediate node does not need to analyze the TB, and only needs to descramble the first DCI correctly to obtain the TB, and then sends the TB to the terminal device. The intermediate node does not involve the processing of the MAC layer and the RLC layer, and only forwards the TB at the PHY layer, so that the TB can be quickly forwarded. The network device shown in fig. 7 selects parameters such as a Modulation Coding Scheme (MCS) and a code rate according to a radio interface between the network device and the intermediate node, generates a first DCI by addressing using an identifier of the terminal device, and transmits a TB to the intermediate node. The intermediate node uses the identifier of the terminal equipment for blind detection, after receiving data, as long as the Cyclic Redundancy Check (CRC) check is correct, and no processing is needed, the intermediate node selects proper parameters such as MCS, code rate and the like according to the condition of a wireless interface between the intermediate node and the terminal equipment, uses the identifier of the terminal equipment for addressing to generate third DCI, and sends TB to the terminal equipment.

In the embodiment shown in fig. 6, the intermediate node only needs to perform physical layer processing on the data packet, reads out the data packet, and does not need to perform MAC layer, RLC layer, and other processing on the data packet, so that the intermediate node has a high processing speed. On the other hand, the terminal equipment only needs to monitor the data packet sent by the intermediate node, and does not need to monitor the data packets sent by the network equipment and the intermediate node simultaneously, so that the difficulty of the terminal equipment is reduced.

In the method flow shown in fig. 6, the first DCI transmitted by the network device to the intermediate node is processed via the identifier of the terminal device. The present application also provides another method for implementing that a network device sends a data packet to a terminal device via an intermediate node, a DCI sent by the network device to the intermediate node is processed via an identifier of the intermediate node, and the scheme is described in detail below with reference to fig. 8.

Fig. 8 is a schematic flow chart of another method of data transmission provided in an embodiment of the present application. The method of data transmission shown in fig. 8 is described below from an interactive perspective.

It should be understood that the method for data transmission provided in fig. 8 can be applied to the industrial control network, in which data transmission is required between a network device and N terminal devices, where the N terminal devices are connected to one intermediate node.

When the network device in fig. 8 has data to send to the terminal device, the data is forwarded to the terminal device through the intermediate node. The end device need only receive packets from the intermediate node and need not receive both packets from the intermediate node and from the network device. For the terminal equipment, the complexity of the terminal equipment is reduced.

The data transmission method comprises the following steps:

s810, the network device determines the second DCI and the second data packet.

Specifically, when the network device has data to transmit to the terminal device, the network device packetizes the data to be transmitted to the N terminal devices into a second packet, and the first packet may be obtained based on the second DCI. The second DCI is processed through the identifier of the intermediate node, or the second DCI is scrambled through the identifier of the intermediate node.

Illustratively, the network device packages the data to be sent to the N terminal devices into a second data packet, which includes the following possible cases:

1) the network device needs to send a plurality of data packets to a terminal device, and the plurality of data packets are packed into a second data packet and forwarded to the terminal device via the intermediate node.

For example, the network device needs to transmit the data packet #1 and the data packet #2 to the terminal device, and the network device may packetize the data packet #1 and the data packet #2 into the second data packet described above.

2) The network device needs to send a plurality of data packets to a plurality of terminal devices, and the plurality of data packets are packed into a second data packet and forwarded to the terminal devices via the intermediate node.

For example, the network device needs to transmit the data packet #1 and the data packet #2 to the terminal device #1 and the terminal device #2, respectively, and the network device may packetize the data packet #1 and the data packet #2 into the second data packet described above.

3) The network device needs to send a data packet to a terminal device, and if the size of the data packet exceeds the air interface transmission capability between the network device and the intermediate node, the network device transmits the data packet in segments, where the second data packet includes a part of data in the data packet.

For example, the network device needs to send the data packet #1 to the terminal device, where the size of the data packet #1 is 200 bits, but the air interface transmission capability between the network device and the intermediate node is 100 bits at a time, the network device may transmit the data packet #1 to the terminal device in a segmented manner, pack 100 bits in the data packet #1 into a second data packet, and pack another 100 bits in the data packet #1 into another second data packet.

4) The network device needs to send the data packet #1 and the data packet #2 to the terminal device #1 and the terminal device #2, respectively, and if the size of the sum of the data packet #1 and the data packet #2 exceeds the air interface transmission capability between the network device and the intermediate node, the network device transmits the data packet #1 and the data packet #2 in a segmented manner, where the second data packet includes a part of data in the data packet #1 and a part of data in the data packet # 2.

For example, the network device needs to transmit the data packet #1 and the data packet #2 to the terminal device #1 and the terminal device #2, respectively, where the size of the data packet #1 is 100 bits, and the size of the data packet #2 is 100 bits, but the air interface transmission capability between the network device and the intermediate node is 100 bits at a time, the network device may transmit the data packet #1 to the terminal device #1 in a segmented manner, and transmit the data packet #2 to the terminal device #2 in a segmented manner, for example, 50 bits in the data packet #1 and 50 bits in the data packet #2 are packed into a second data packet, and the other 50 bits in the data packet #1 and the other 50 bits in the data packet #2 are packed into another second data packet.

5) The network device needs to send the data packet #1 and the data packet #2 to the terminal device #1 and the terminal device #2, respectively, and if the size of the sum of the data packet #1 and the data packet #2 exceeds the air interface transmission capability between the network device and the intermediate node, the network device transmits the data packet #1 and the data packet #2, respectively, where the second data packet includes the data packet # 1.

For example, the network device needs to send the data packet #1 and the data packet #2 to the terminal device #1 and the terminal device #2, respectively, where the size of the data packet #1 is 100 bits, and the size of the data packet #2 is 100 bits, but the air interface transmission capability between the network device and the intermediate node is 100 bits at a time, the network device may pack the data packet #1 into a second data packet, and pack the data packet #2 into another second data packet.

It should be understood that the second DCI described above is used for the intermediate node to acquire the second data packet described above, i.e., the second DCI corresponds to the second data packet. All need to be sent to the intermediate node, S820 is executed, and the network device sends the second DCI and the second data packet to the intermediate node. Specifically, the second DCI is transmitted to the intermediate node through the PDCCH; the second data packet is transmitted to the intermediate node through the PDSCH.

After receiving the second DCI and the second data packet, the intermediate node may descramble the second DCI, thereby obtaining the second data packet. In particular, in the embodiment shown in fig. 8, if the intermediate node knows the identifier of the intermediate node from the network device, the method flow shown in fig. 8 further includes S811, and the network device allocates the identifier of the intermediate node to the intermediate node.

After the foregoing S811 is executed, the intermediate node can obtain the identifier of the intermediate node, and then after the intermediate node receives the second DCI and the second data packet, the intermediate node may descramble the second DCI using the identifier of the intermediate node to obtain the second data packet, and determine that data in the second data packet needs to be sent to the N terminal devices, that is, S830 is executed, and the intermediate node descrambles the second DCI, divides the second data packet, and obtains N third data packets. The detailed partitioning process is as follows:

it should be understood that fig. 8 is only illustrated by taking an example that a network device is connected with one intermediate node, and in practical applications, a network device may be connected with a plurality of intermediate nodes, and the network device may transmit data to a plurality of terminal devices connected to the intermediate nodes through the plurality of intermediate nodes, respectively. The network device may assign the identifications of the intermediate nodes to the plurality of intermediate nodes respectively in S811 as described above. For the intermediate node, after receiving the second data packet, the data of the N terminal devices included in the second data packet needs to be sent to the N terminal devices, respectively, that is, the intermediate node needs to determine which data in the second data packet is sent to which terminal device.

For example, in the embodiment shown in fig. 8, the intermediate node determines to which N terminal devices the data in the second data packet is respectively sent, which may be determined in the following two ways:

the first method is as follows: the second DCI further includes second indication information for indicating the N terminal devices. Correspondingly, the intermediate node determines to send the data in the second data packet to the N terminal devices respectively.

As shown in fig. 9, fig. 9 is a schematic diagram of a second data packet structure according to an embodiment of the present application. As can be seen from fig. 9, the second packet transmitted by the network device includes data that the network device needs to transmit to terminal device #1 and terminal device #2, and the second DCI includes second indication information indicating terminal device #1 and terminal device # 2. Further, the second DCI further includes indication information indicating sizes and time-frequency positions of data packets respectively sent to the N terminal devices in the second data packet, or the sizes and the time-frequency positions of the data packets respectively sent to the N terminal devices in the second data packet are preset and do not need to be additionally indicated by the indication information in the second DCI. After receiving the second DCI and the second data packet, the intermediate node may divide the second data packet into N data packets based on the indication of the second DCI and send the N data packets to the N terminal devices, respectively.

In this way, the network device can pack the data packets to be sent to the plurality of terminal devices into a second data packet and send the second data packet to the intermediate node, and the intermediate node directly forwards the second data packet to the plurality of terminal devices after simple processing. The second packet does not need to be processed by the MAC layer and the RLC layer of the intermediate node within the intermediate node.

The second method comprises the following steps: the MAC subheader of the second packet is used to indicate the size of the data packets respectively sent to the N terminal devices from among the N terminal devices and the second packet.

When the network device determines the second data packet, the MAC subheader of the second data packet indicates to which terminal devices the data in the second data packet is sent, and the MAC subheader also indicates the size of the data packet sent to each terminal device.

As shown in fig. 10, fig. 10 is a schematic diagram of another second data packet structure provided in this embodiment of the present application. As can be seen from fig. 10, the second packet transmitted by the network device to the terminal device includes data that the network device needs to transmit to the terminal device #1 and the terminal device #2, and the MAC subheader of the second packet indicates the size of the packet transmitted to the terminal device #1 and the terminal device #2, respectively, in the second packet.

And after the intermediate node receives the second DCI and the second data packet, if the CRC of the second data packet does not check the second DCI and the second data packet, the intermediate node gives the second data packet to the MAC layer of the intermediate node for processing. The MAC layer identifies which terminal devices the data packets in the second data packet are respectively sent to according to a logical channel identity (LCH ID).

In fig. 10 a, two logical channels of the terminal apparatus #1 (two logical channels corresponding to the RLC a and the RLC B shown in fig. 10 a) are associated, and one logical channel of the terminal apparatus #2 (a logical channel corresponding to the RLC shown in fig. 10 a) is associated. Illustratively, as a specific implementation manner, in a protocol stack on the network device side, there are two MAC layers, the upper MAC layer (such as MAC for UE1 and MAC for UE2 shown in fig. 10 (a)) is a MAC layer of a packet corresponding to each terminal device, each of terminal device #1 and terminal device #2 corresponds to one MAC layer, and the lower MAC layer (such as MAC for node x shown in fig. 10 (a)) is a MAC layer of a packet of an interface between the network device and an intermediate node;

in fig. 10B, two logical channels of the terminal apparatus #1 (two logical channels corresponding to the RLC a and the RLC B shown in fig. 10B) are associated, and one logical channel of the terminal apparatus #2 (a logical channel corresponding to the RLC shown in fig. 10B) is associated. Illustratively, as another specific implementation manner, in the protocol stack on the network device side, the MAC layers on the right side (such as the MAC for UE1 and the MAC for UE2 shown in fig. 10 (b)) are MAC layers of packets corresponding to each terminal device, each of the terminal device #1 and the terminal device #2 corresponds to one MAC layer, and the MAC layers on the left side (such as the MAC for node x shown in fig. 10 (b)) are MAC layers of packets of an interface between the network device and the intermediate node, that is, the MAC layers of the packets of the interface between the network device and the intermediate node and the MAC layers of the packets corresponding to each terminal device may be located at different positions in the same MAC layer.

The downlink data sent to the two terminal devices are packed into a second data packet in the network device, the second DCI is scrambled by using the identifier of the intermediate node and then sent out, the physical layer in the intermediate node determines that the CRC of the second data packet is correct and then sends the second DCI to the MAC layer of the intermediate node for processing, the MAC layer of the intermediate node divides the second data packet into two TBs after identifying the identifier of the terminal device in the packet header of the second data packet, and the two TBs are respectively sent to the two terminal devices. The MAC layer of the intermediate node only processes the MAC sub-head of the outer layer and does not process the MAC sub-head of the inner layer. As shown in fig. 11, the MAC layer of the intermediate node processes only the dashed frame portion and does not process the solid frame portion. Fig. 11 is a schematic diagram of processing a second packet by the MAC layer of an intermediate node according to an embodiment of the present application. After the MAC layer of the intermediate node shown in fig. 11 processes the portions shown by the dashed line blocks, it is possible to determine the data sizes of the second packet transmitted to terminal apparatus #1 (UE 1 shown in fig. 11) and terminal apparatus #2 (UE 2 shown in fig. 11), respectively, and directly split the second packet into two packets to be transmitted to terminal apparatus #1 and terminal apparatus #2, respectively. Specifically, when the intermediate node transmits packets to terminal apparatus #1 and terminal apparatus #2, it is necessary to simultaneously transmit the fourth DCI scrambled by the identifier of terminal apparatus #1 and the identifier of terminal apparatus #2, respectively. As shown in fig. 12, fig. 12 is a schematic diagram of a data packet sent by an intermediate node to a terminal device according to an embodiment of the present application.

It should be understood that, in the embodiment shown in fig. 8, after the intermediate node receives the second DCI and the second data packet sent by the network device, it is determined that the data in the second data packet is sent to the N terminal devices respectively, provided that the intermediate node knows the identities of the N terminal devices. Similar to the first and second solutions shown in fig. 6, in the embodiment of the method shown in fig. 8, the intermediate node learns the identifiers of the N terminal devices through two possible solutions:

the first scheme is as follows: if the intermediate node learns the identifiers of the N terminal devices from the network device, the method flow shown in fig. 8 further includes S812, where the network device allocates the identifiers of the terminal devices to the N terminal devices.

Specifically, each of the N terminal devices may directly obtain its own identifier from the network device through an RA or other procedure.

Further, after the network device allocates the identifiers of the N terminal devices to the terminal devices, in order to enable the intermediate node to acquire the identifiers of the terminal devices connected to the intermediate node, the method flow shown in fig. 8 further includes S813, where the network device sends the identifiers of the N terminal devices to the intermediate node. The network equipment can inform the identifiers of the N pieces of terminal equipment to the intermediate node through the pre-configuration information; or, the network device may also learn, through the measurement reports reported by the N terminal devices, that the N terminal devices are closest to the intermediate node, and notify the intermediate node of the identifiers of the N terminal devices.

After performing the above S812 and S813, the intermediate node can learn the identities of the N terminal devices, and then after the intermediate node receives the second DCI and the second data packet and learns that the data in the second data packet is sent to the N terminal devices respectively, the intermediate node may scramble N fourth DCI by using the identities of the N terminal devices respectively.

In a possible implementation, if the actions performed by multiple terminal devices are always the same, the multiple terminal devices may be assigned the same identifier of the terminal device, in which case the network device may send data to the multiple terminal devices via the intermediate node at the same time.

In another possible implementation manner, if there are two intermediate nodes under the network device, the identifiers of the terminal devices respectively connected to the two intermediate nodes may be the same.

Scheme II: if the intermediate node allocates the identifiers of the terminal devices to the N terminal devices and notifies the network device of the identifiers of the N terminal devices, the method flow shown in fig. 8 further includes S814, where the intermediate node allocates the identifiers of the terminal devices to the N terminal devices.

Further, after the intermediate node allocates the identifier of the terminal device to the terminal device, in order to enable the network device to acquire the identifier of the terminal device, the method flow shown in fig. 8 further includes S815, where the intermediate node sends the identifiers of the N terminal devices to the network device.

After S830 is performed, the intermediate node determines that the data in the second data packet is respectively sent to the N terminal devices, that is, S840 is performed. The intermediate node decomposes the data in the second data packet into N data packets, and the N data packets are respectively sent to the N terminal devices. Specifically, the N data packets correspond to N DCIs, and taking an example that an intermediate node sends a data packet to any one of the N terminal devices, the intermediate node sends a fourth DCI and a third data packet to the terminal device, where data included in the third data packet is data included in the second data packet and required to be sent to the terminal device, and the fourth DCI is used for the terminal device to obtain the third data packet, where the fourth DCI is scrambled by an identifier of the terminal device. After receiving the fourth DCI and the third data packet, the terminal device descrambles the fourth DCI based on its own identifier, and obtains the first data packet, that is, S841 is further included in the embodiment shown in fig. 8, and the terminal device obtains the third data packet.

In the method flows shown in fig. 6 and fig. 8, a handover of a cell may also occur, that is, one or more terminal devices connected to the intermediate node and the intermediate node may be handed over from the above-mentioned network device to another network device (target network device), and how to implement the handover of the network device is described in detail below with reference to fig. 13. Fig. 13 is a schematic flowchart of a handover network device according to an embodiment of the present application.

The method for switching the network equipment comprises the following steps:

s1310, the source network device sends a handover request to the destination network device.

Specifically, when a source network device determines to switch an intermediate node connected to the source network device and a plurality of terminal devices connected to the intermediate node to a destination network device, the source network device sends a switching request to the destination network device. Wherein, the switching request contains the identification of all terminal devices connected under the intermediate node.

For example, in the method flow shown in fig. 6 described above, the source network device is the network device shown in fig. 6. The network equipment sends a switching request to target network equipment, wherein the switching request is used for requesting the intermediate node and the terminal equipment to be accessed to the target network equipment, and the switching request carries the identifier of the terminal equipment;

in the method flow shown in fig. 8, the source network device is the network device shown in fig. 8. The network equipment sends a switching request to target network equipment, wherein the switching request is used for requesting the intermediate node and the N pieces of terminal equipment to be accessed to the target network equipment, and the switching request carries the identification of the N pieces of terminal equipment.

S1320, the destination network device sends a handover response to the source network device.

After receiving the switching request, the destination network device learns that there is a conflict between the identifier of a certain or some terminal devices to be switched and the identifier of the terminal device connected below the current destination network device, and the switching response carries indication information, informs the source network device and indicates that the identifier of the certain or some terminal devices to be switched to the destination network device needs to be updated.

For example, in the method flow shown in fig. 6 described above, the source network device is the network device shown in fig. 6. The target network equipment carries first indication information in a switching response sent to the network equipment, wherein the first indication information is used for indicating that the identifier of the terminal equipment needs to be updated; further, the first indication information carries an identifier of the terminal device after the terminal device is updated, for example, the first indication information indicates that RNTI #1(YYYY) of the terminal device is updated to RNTI #2 (ZZZZ);

in the method flow shown in fig. 8, the source network device is the network device shown in fig. 8. The target network device sends a handover response to the network device, where the handover response includes third indication information, where the third indication information is used to indicate that an identifier of at least one terminal device of the N terminal devices needs to be updated, and specifically, the third indication information indicates that RNTI #1 of the terminal device #1 is updated to RNTI #2, and RNTI #3 of the terminal device #2 is updated to RNTI # 4.

S1330, the source network device sends a handover command to the intermediate node.

Specifically, the handover command includes indication information indicating that the identity of a certain terminal device or certain terminal devices is updated.

For example, in the method flow shown in fig. 6, the handover command includes the first indication information; in the method flow shown in fig. 8, the handover command includes the third indication information.

S1340, the intermediate node sends a switching instruction to the terminal equipment.

Specifically, in the method flow shown in fig. 6, the switching indication includes the first indication information. In the method flow shown in fig. 8, the switching instruction includes the third instruction information.

For example, the intermediate node notifies the terminal apparatus #2 that the RNTI of the terminal apparatus #2 is changed from YYYY to ZZZZ. The switching indication may be notified to the terminal apparatus #2 by RRC signaling or MAC CE.

Specifically, the method flow shown in fig. 8 further includes S1341, where the terminal device updates the identifier of the terminal device. For example, upon receiving a handover instruction from the intermediate node that the RNTI of the terminal apparatus #2 is changed from YYYY to ZZZZ, the terminal apparatus #2 updates the locally stored rntiyyyyy of the terminal apparatus #2 to RNTIZZZZ.

Further, the intermediate node is accessed into the destination network device to complete the switching process of the network device.

In the method flows shown in fig. 6 and fig. 8, a connection failure of a terminal device may also occur, that is, a connection failure may occur in one or more terminal devices connected to an intermediate node, and the connection failure may not be successfully connected to the intermediate node, and details about which actions are performed by the intermediate node and a network device connected to the intermediate node when the connection failure occurs in the terminal device connected to the intermediate node are described below with reference to fig. 14. Fig. 14 is a schematic flowchart of a connection failure of a terminal device according to an embodiment of the present application.

Of the N terminal apparatuses connected to the intermediate node as shown in fig. 14, terminal apparatus #2 cannot be successfully connected to the intermediate node for some reason.

The method for the connection failure of the terminal equipment comprises the following steps:

and S1410, the intermediate node determines that the connection of the terminal equipment fails.

The terminal device is any one of N terminal devices connected with the intermediate node.

Specifically, how the intermediate node determines that the terminal device fails to connect is not limited in the present application, and for example, it may be that the intermediate node fails to send data to the terminal device, or that the terminal device fails to work normally as determined by information reported by other terminal devices.

Optionally, when the intermediate node determines that the terminal device resumes the connection again, the intermediate node may send a connection resumption notification message to the network device, so as to notify the network device that the terminal device has resumed the connection, and may communicate with the network device.

S1420, the intermediate node sends connection failure indication information to the network device.

Specifically, the connection failure indication information is used to indicate that the terminal device fails to connect to the intermediate node.

Optionally, the intermediate node periodically reports to the network device whether each terminal device connected to the intermediate node is normally connected, and if the intermediate node determines that a certain terminal device fails to connect, the intermediate node notifies the network device through the connection failure indication information, where the connection failure indication information may be carried in a periodic reporting message of the intermediate node.

Further, after the network device learns that a certain terminal device fails to connect, the network device stops sending the instruction to the terminal device, and the network device does not transmit data to the terminal device that fails to connect through the intermediate node. The intermediate node may also notify the network device of the current state of the terminal device, that is, the above-mentioned connection failure indication information may also include state information. Wherein the status information may be at least one of the following information: which instructions are currently received by the terminal device, which instructions are received by the terminal device, and which instructions have not been fed back, the RLC status report of the terminal device, or the PDCP status report of the terminal device.

Fig. 6-14 mainly describe the flow of forwarding data packets from the network device to the terminal device via the intermediate node, and the operation of the network device and the intermediate node when network device handover or terminal device connection failure may occur. How the network device configures the identifier for the terminal device in the Sidelink (SL) is described in detail below with reference to fig. 15 and 16. It should be understood that the reference to communication between terminal devices as sidelink communication in this application is not intended to limit the application in any way. For example, sidelink communication may also be referred to as side link communication, through link communication, or sidelink communication, among others.

The vehicle networking technology proposed for vehicle to anything communication (V2X) in the LTE communication system involves the allocation of SL resources. Among them, SL resource allocation in LTE V2X is mainly 2 modes, mode3 and mode 4.

mode3 is the terminal device requesting SL resources from the network device. For example, when terminal #1 has data to transmit to terminal #2, a Buffer Status Report (BSR) of the SL is transmitted to the network device, where the SL BSR includes an identifier (destination index) of the destination terminal, an identifier of a Logical Channel Group (LCG), and a corresponding buffer size (buffer size). After receiving the SL BSR sent by the terminal #1, the network device allocates SL resources to the terminal. Specifically, the network device allocates SL resources to the terminal device #1 through a Downlink Control Information (DCI) format 5A, and the DCI format 5A is mainly used for scheduling a Physical Sidelink Control Channel (PSCCH). The DCI format 5A includes a carrier indicator (carrier indicator), a lowest sub-channel identifier allocated to initial transmission, an SL identifier, a semi-persistent scheduling (SPS) configuration identifier, an activation/release indicator, and parameters (frequency domain resources of initial transmission and retransmission, time intervals of initial transmission and retransmission) of format 1 of downlink control information (SCI) at the SL transmission side of the subsequent terminal device # 1.

Next, when the SL transmits data to the terminal #2, the terminal #1 includes the following information in the SCI: near field communication packet priority (PPPP), resource reservation, frequency domain resource locations of initial transmission and retransmission, time intervals of initial transmission and retransmission, modulation and coding scheme, retransmission indication, and the like.

mode4 is where the network device includes SL resource information, such as transmit resource pool information and receive resource pool information, in the broadcast message. The resource pool may be a frequency domain resource composed of one or more radio Resource Blocks (RBs), or a time-frequency domain resource composed of one or more RBs on a specific subframe or set of subframes. There may be one or more resource pools on each carrier. When the terminal equipment transmits data, the terminal equipment selects and transmits the data in the transmission resource pool. Generally, a terminal device will first sense a sending resource pool to obtain a received signal strength, and when the received signal strength is found to be lower than a certain threshold, the terminal device selects to send a data packet to be sent. Or the terminal device finds a corresponding threshold according to a near-field communication packet priority (PPPP) of the data packet to be sent and the PPPP of the data packet currently being transmitted, and when the received signal strength is lower than the corresponding threshold, the terminal device selects to send the data packet to be sent.

The communication system in the existing SL resource configuration mode includes a terminal device and a network device, and the terminal device can search for the DCI format 5A sent by the network device and belonging to itself to acquire the SL resource. After introducing a scheduling group header (the aforementioned intermediate node) in the terminal device and the network device in the communication system, the terminal device may apply for SL resources from the scheduling group header when the terminal device has data to transmit. However, at present, there is no method for allocating SL resources to other terminal devices by an intermediate node in the SL communication system. After the scheduling group head is introduced, the transmission direction from the scheduling group head to the terminal equipment is called downlink transmission, the transmission direction from the terminal equipment to the scheduling group head is called uplink transmission, and the transmission direction from the terminal equipment to the terminal equipment is called parallel transmission. The terminal device may apply for resources to the scheduling group head for non-uplink transmission. The frequency domain resource locations of the initial transmission and the retransmission, the time intervals of the initial transmission and the retransmission, and the like, which are included in the original SCI, are referred to herein as downlink SL resources.

One possible method is that the scheduling group head may include non-uplink SL resources in addition to downlink SL resources in transmitting SCI. For example, the frequency domain resource locations of the non-uplink initial transmission and retransmission, the time intervals of the non-uplink initial transmission and retransmission, and the like. When the scheduling group header includes non-uplink SL resources for multiple terminal devices in the SCI, the identifier of the terminal device needs to be introduced.

Fig. 15 is a schematic diagram of a method for configuring an identifier according to an embodiment of the present application. It is assumed that the network device and the intermediate node communicate over the air interface of the cellular network, i.e. the intermediate node is a terminal device with respect to the network device. The intermediate node and the terminal device communicate through a sidelink, and the intermediate node is a scheduling group head of the sidelink relative to the terminal device.

The method for configuring the identifier comprises the following steps:

s1510, the network device receives the first association request message sent by the intermediate node.

The first association request message is used for requesting the network device to configure the identifier for the terminal device.

For example, the intermediate node carries the first association request message in an Uplink (UL) RRC message, where the first association request message includes a sidelink user identity (SL UE ID) of the terminal device in the sidelink.

In the method flow shown in fig. 15, before the intermediate node sends the first association request message to the network device, a second association request message is received from the terminal device on the sidelink. S1520 is further included in the method flow shown in fig. 15, and the terminal device sends a second association request message to the intermediate node. For example, the SLMAC header sent by the SL to the intermediate node includes a SL UE ID, which may be referred to as a ProSe UE ID, that is, an identifier of the terminal device on the sidelink.

The difference between the SL UE ID and the identifier of the terminal device allocated by the network device to the terminal device in this application includes: the SL UE ID is typically 24 bit. When the intermediate node uses the SL UE ID to allocate resources to the terminal device, it is wasted because the SCI includes the SL UE ID that occupies too many air interface resources. It is assumed herein that the network device allocates an intermediate node to the terminal device for identifying the identifier of the terminal device, so as to reduce air interface overhead. For example, when one intermediate node manages 30 terminal devices, only 5 bits are necessary to sufficiently identify one terminal device. For example, in the case of device-to-device (D2D) communication, the intermediate node may divide the 24 bits in the data packet that can be used to identify the terminal device into 8 bits and 16 bits, where 8 bits are carried in the SCI to identify the terminal device, and 16 bits are contained in the MAC header of the data packet to be used for other functions (the application is not limited to the use of the saved bits), and in this case, the terminal device does not need to read the 16 bits in the MAC header to know whether the data is data to be sent to itself, thereby reducing the processing complexity at the terminal device side.

The method flow shown in fig. 15 further includes a flow in which the intermediate node determines itself to be the head of the scheduling group. The method flow shown in fig. 15 further includes, S1511, the network device sending fourth indication information to the intermediate node. The fourth indication information is used for indicating the intermediate node as a scheduling group head of at least one terminal device, and the scheduling group head is used for scheduling the sidelink SL resource for the at least one terminal device. For example, the network device may carry the fourth indication information in an RRC reconfiguration message.

It should be understood that in the method flow shown in fig. 15, before the network device sends the fourth indication information to the intermediate node, it needs to determine that the intermediate node is the scheduling group head described above. Specifically, in the embodiment of the present application, the network device may determine that the intermediate node is a scheduling group head by any one of the following possible manners:

the first method is as follows: the intermediate node applies for the network device to become a scheduling group head, or reports the capability of the intermediate node with the scheduling group head to the network device. In this manner, the method flow shown in fig. 15 further includes S1512, in which the intermediate node sends a request message to the network device, where the request message is used to request the network device to set the intermediate node as a scheduling group head, or the request message is used to notify the network device that the intermediate node has the capability of scheduling the group head, or the intermediate node has the SL resource allocation and scheduling functions.

The second method comprises the following steps: the core network informs the network equipment that the intermediate node is a scheduling group head. In this manner, the method flow shown in fig. 15 further includes S1513, in which the intermediate node sends sixth indication information to the core network device, and the sixth indication information is used to indicate that the intermediate node is an upper layer group header. The method shown in fig. 15 further includes S1514, where the core network device authenticates that the intermediate node is successfully grouped into a higher layer. For example, the intermediate node includes, in a non-access stratum (NAS) message, sixth indication information indicating that the intermediate node is an upper-layer group header; the method flow shown in fig. 15 further includes S1515, after the core network device is successfully authenticated, sending fifth indication information to the network device, where the fifth indication information is used to indicate that the intermediate node is a scheduling group head. For example, the Access Management Function (AMF) network element sends fifth indication information to the gNB, indicating that the intermediate node is a high-level group head, and then the subsequent gNB sets the high-level group head as a scheduling group head as needed.

Further, after learning that the intermediate node is a scheduling group head, the intermediate node needs to notify the terminal device of information of the scheduling group head, and then the method flow shown in fig. 15 further includes S1516, in which the intermediate node broadcasts a discovery message, and the intermediate node broadcasts the discovery message at SL, where the discovery message includes a scheduling group head instruction, and may also include a group identifier of a high-layer group in which the intermediate node is located.

S1530, the network device sends an association response message to the intermediate node.

The association response message includes the identifier allocated by the network device for the terminal device. For example, the association response message is carried in the RRC reconfiguration message. The association response message may further include an identifier of the terminal device in the sidelink and a corresponding UE ID.

S1540, the intermediate node sends the UE ID to the terminal equipment.

And after receiving the association response message, the intermediate node determines the UE ID, forwards the UE ID to the terminal equipment, and completes the configuration of the UE ID for the terminal equipment. For example, after acquiring the identifier of the terminal device in the sidelink and the corresponding UE ID, the intermediate node sends the UE ID to the terminal device corresponding to the identifier of the terminal device in the sidelink through the sidelink.

After the identifier configuration of the terminal device is completed, optionally, the terminal device sends a Scheduling Request (SR) or a BSR to the intermediate node in the SL. The SL scheduling result sent by the intermediate node to the terminal device includes the identifier of the terminal device and the corresponding SL time-frequency resource. For example, the intermediate node includes in the SCI the identity of one or more terminal devices and the corresponding SL time-frequency resources.

The method for configuring the identifier comprises the following steps:

s1610, the network device sends fourth indication information to the intermediate node.

And the fourth indication information is used for indicating the intermediate node as a scheduling group head of the terminal equipment, and the scheduling group head is used for scheduling the side uplink SL resources for the terminal equipment, wherein the fourth indication information comprises an identifier set, and identifiers in the identifier set comprise identifiers of the terminal equipment.

In the method flow shown in fig. 16, before the network device sends the fourth indication information to the intermediate node, it needs to determine that the intermediate node is the scheduling group head. Specifically, in the embodiment of the present application, the network device may determine that the intermediate node is a scheduling group head by any one of the following possible manners:

The first method is as follows: in a manner similar to that of S1511 in fig. 15, the description is omitted here. In this manner, similar to fig. 15, the method flow shown in fig. 16 further includes S1611, the intermediate node sending a request message to the network device.

The second method comprises the following steps: similar to the manner mentioned in S1511 in fig. 15, the description is omitted here. In this manner similar to fig. 15, the method flow shown in fig. 16 further includes S1612, the intermediate node sends the sixth indication information to the core network device and S1613, the core network device performs authentication and S1614, and after the core network device is successfully authenticated, the intermediate node sends the fifth indication information to the network device.

Further, after learning that the intermediate node is a scheduling group head, the intermediate node needs to notify the terminal device of the information of the scheduling group head, then the method flow shown in fig. 16 further includes S1615, the intermediate node broadcasts discovery information in the SL, and the discovery information includes a scheduling group head instruction and possibly also includes a group identifier of a high-level group in which the intermediate node is located.

After the intermediate node determines that the intermediate node is the head of the scheduling group and knows the identifier set, the intermediate node may configure an identifier for the terminal device. Specifically, the method flow shown in fig. 16 further includes S1620, and the terminal device sends the second association request message to the intermediate node. For example, the terminal device includes a SL UE ID in a SL MAC header transmitted from the SL to the intermediate node, and the SL UE ID may be referred to as a ProSe UE ID.

S1630, the intermediate node determines the identifier of the terminal device.

The intermediate node selects one identifier from the identifier set assigned by the network device in S1610 as the identifier of the terminal device.

S1640, the intermediate node sends the identifier of the terminal device to the terminal device.

The intermediate node completes the configuration of the identifier for the terminal equipment.

After the identifier configuration of the terminal device is completed, optionally, the terminal device sends an SR or BSR to the intermediate node at SL. The SL scheduling result sent by the intermediate node to the terminal device includes the identifier of the terminal device and the corresponding SL time-frequency resource. For example, the intermediate node includes in the SCI the identity of one or more terminal devices and the corresponding SL time-frequency resources.

The method for data transmission provided by the embodiment of the present application is described in detail above with reference to fig. 6 to 14, and the method for configuration identification provided by the embodiment of the present application is described in detail with reference to fig. 15 and 16, and the apparatus for data transmission provided by the embodiment of the present application is described in detail below with reference to fig. 17 to 22.

Referring to fig. 17, fig. 17 is a schematic diagram of the apparatus 10 for data transmission proposed in the present application. As shown in fig. 17, the apparatus 10 includes a receiving unit 1710, a processing unit 1720, and a transmitting unit 1370.

A receiving unit 1710, configured to receive a third DCI sent by the intermediate node and the first data packet, where the third DCI is processed via an identifier of the terminal device, and the first data packet includes a data packet sent to the terminal device;

A processing unit 1720, configured to descramble the third DCI based on the identifier of the terminal device, to obtain the first data packet.

The apparatus 10 and the terminal device in the method embodiment completely correspond to each other, and the apparatus 10 may be the terminal device in the method embodiment, or a chip or a functional module inside the terminal device in the method embodiment. The corresponding elements of the apparatus 10 are adapted to perform the corresponding steps performed by the terminal device in the method embodiments shown in fig. 6-16.

Wherein, the receiving unit 1710 in the apparatus 10 executes the steps received by the terminal device in the method embodiment. For example, step S611 in fig. 6 is executed to receive the identifier of the terminal device assigned by the network device, or step S613 in fig. 6 is executed to receive the identifier of the terminal device assigned by the intermediate node; step S640 in fig. 6 is further executed to receive the third DCI and the first data packet sent by the intermediate node; step S812 in fig. 8 is further executed to receive the identifier of the terminal device allocated by the network device, or step S814 in fig. 8 is executed to receive the identifier of the terminal device allocated by the intermediate node; step S840 in fig. 8 is further executed to receive a fourth DCI and a third data packet sent by the intermediate node; step S1340 in fig. 13 is also executed to receive a handover instruction sent by the intermediate node; step S1516 in fig. 15 is also executed to receive the discovery message broadcast by the intermediate node; step S1540 in fig. 15 is also executed to receive the identifier of the terminal device sent by the intermediate node; step S1615 in fig. 16 is also executed, and the discovery message broadcasted by the intermediate node is received; step S1640 in fig. 16 is also executed to receive the identification of the terminal device sent by the intermediate node.

Processing unit 1720 of apparatus 10 performs steps implemented or processed internally by the terminal device in the method embodiments. For example, step S641 in fig. 6 is executed to obtain a first data packet; step S841 in fig. 6 is further executed to obtain a third data packet; step S1341 in fig. 13 is also executed to update the identifier of the terminal device.

The sending unit 1730 in the apparatus 10 performs the steps of sending by the terminal device in the method embodiment. For example, step S1520 in fig. 15 is performed, the second association request message is transmitted to the intermediate node, and step S1620 in fig. 16 is performed, the second association request message is transmitted to the intermediate node.

The receiving unit 1710 and the transmitting unit 1730 may constitute a transceiving unit, and have both receiving and transmitting functions. Processing unit 1720 may be a processor, among other things. The transmitting unit 1730 may be a receiver. The receiving unit 1710 may be a transmitter. The receiver and transmitter may be integrated together to form a transceiver.

Referring to fig. 18, fig. 18 is a schematic structural diagram of a terminal device 20 suitable for use in the embodiments of the present application. The terminal device 20 is applicable to the system shown in fig. 1. For convenience of explanation, fig. 18 shows only main components of the terminal device. As shown in fig. 18, the terminal device 20 includes a processor, a memory, a control circuit, an antenna, and an input-output means. The processor is used for controlling the antenna and the input and output device to send and receive signals, the memory is used for storing a computer program, and the processor is used for calling and running the computer program from the memory to execute the corresponding flow and/or operation executed by the terminal device in the data transmission method provided by the application. And will not be described in detail herein.

Those skilled in the art will appreciate that fig. 18 shows only one memory and processor for ease of illustration. In an actual terminal device, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, and the like, which is not limited in this application.

Referring to fig. 19, fig. 19 is a schematic diagram of a device 30 for data transmission proposed in the present application. As shown in fig. 19, the apparatus 30 includes a processing unit 1910, a transmitting unit 1920, and a receiving unit 1930.

A processing unit 1910, configured to determine a first DCI and a first data packet, where the first DCI is processed via an identifier of a terminal device, and the first data packet includes a data packet sent to the terminal device;

a sending unit 1920 is configured to send the first DCI and the first data packet to the intermediate node.

The apparatus 30 corresponds to the network device in the method embodiment, and the apparatus 30 may be the network device in the method embodiment, or a chip or a functional module inside the network device in the method embodiment. The corresponding elements of the apparatus 30 are used to perform the corresponding steps performed by the network device in the method embodiments shown in fig. 6-16.

Processing unit 1910 in apparatus 30 executes steps implemented or processed inside a network device in the method embodiment. For example, step S610 in fig. 6 is executed to determine a first DCI and a first data packet; step S810 in fig. 8 is also performed to determine a second DCI and a second packet.

The sending unit 1920 in the apparatus 10 executes the steps sent by the network device in the method embodiment. For example, step S611 in fig. 6 is executed to assign the identifier of the terminal device to the terminal device; step S620 in fig. 6 is also executed to send the first DCI and the first data packet to the intermediate node; step S812 in fig. 8 is also executed to assign the identifier of the terminal device to the terminal device; step S811 in fig. 8 is also performed, assigning an identification of the intermediate node to the intermediate node; step S820 in fig. 8 is also executed, and a second DCI and a second data packet are sent to the intermediate node; if step S1320 in fig. 13 is further executed to send a handover command to the intermediate node, specifically, the apparatus 30 may also be the destination network device in fig. 13, the sending unit 1920 further executes step S1320 in fig. 13 to send a handover response to the source network device; step S1511 in fig. 15 is also executed to send fourth indication information to the intermediate node; step S1530 in fig. 15 is also executed, and an association response message is sent to the intermediate node; step S1610 in fig. 16 is also executed to transmit fourth indication information to the intermediate node.

A receiving unit 1930 in the apparatus 10 executes the steps received by the network device in the method embodiment. For example, step S614 in fig. 6 is executed to receive the identifier of the terminal device sent by the intermediate node; step S815 in fig. 8 is further executed to receive the identifiers of the N terminal devices sent by the intermediate node; specifically, the apparatus 30 may also be the source network device in fig. 13, and then the receiving unit 1930 further executes step S1320 in fig. 13 to receive the handover response sent by the destination network device; step S1420 in fig. 14 is further executed to receive connection failure indication information sent by the intermediate node; step S1512 in fig. 15 is also executed to receive a request message sent by the intermediate node; step S1510 in fig. 15 is further executed to receive a first association request message sent by the intermediate node; step S1611 in fig. 16 is also executed, and a request message sent by the intermediate node is received; step S1614 in fig. 16 is also executed to receive fifth indication information sent by the core network device.

The receiving unit 1930 and the transmitting unit 1920 may constitute a transceiving unit, and have functions of receiving and transmitting at the same time. Wherein the processing unit 1910 may be a processor. The transmitting unit 1920 may be a receiver. The receiving unit 1930 may be a transmitter. The receiver and transmitter may be integrated together to form a transceiver.

Referring to fig. 20, fig. 20 is a schematic structural diagram of a network device 40 suitable for the embodiment of the present application, and the network device may be used to implement the functions of the network device in the data transmission method described above. Such as a schematic diagram of the structure of the base station. As shown in fig. 20, the network device may be applied to the system shown in fig. 1.

The network device 40 may include one or more radio frequency units, such as a Remote Radio Unit (RRU) 2001 and one or more Base Band Units (BBUs). The baseband unit may also be referred to as a Digital Unit (DU) 2002. The RRU 2001 may be referred to as a transceiver unit, and corresponds to the receiving unit 1930 and the sending unit 1920 in fig. 19. Optionally, the transceiving unit 2001 may also be referred to as a transceiver, transceiving circuit, transceiver, or the like, which may include at least one antenna 2011 and the radio frequency unit 2012. Alternatively, the transceiver 2001 may include a receiving unit and a transmitting unit, where the receiving unit may correspond to a receiver (or receiver or receiving circuit), and the transmitting unit may correspond to a transmitter (or transmitter or transmitting circuit). The RRU 2001 part is mainly used for transceiving radio frequency signals and converting the radio frequency signals and baseband signals, for example, for sending the control information described in the above embodiments to a terminal device. The BBU2002 section is mainly used for performing baseband processing, controlling a base station, and the like. The RRU 2001 and the BBU2002 may be physically disposed together or may be physically disposed separately, that is, a distributed base station.

The BBU 2002 is a control center of a network device, which may also be referred to as a processing unit, and may correspond to the processing unit 1930, and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading. For example, the BBU (processing unit 1910)2002 can be used to control the network device 40 to perform the operation flow related to the network device in the above method embodiments, for example, to determine the length of the symbol carrying the control information of the terminal device.

In an example, the BBU 2002 may be formed by one or more boards, and the boards may collectively support a radio access network of a single access system (e.g., an LTE system or a 5G system), or may respectively support radio access networks of different access systems. The BBU 2002 further includes a memory 2021 and a processor 2022. The memory 2021 is used to store the necessary instructions and data. For example, the memory 2021 stores the codebook and the like in the above-described embodiments. The processor 4022 is configured to control the base station to perform necessary actions, for example, to control the base station to execute the operation flow related to the network device in the above method embodiment. The memory 2021 and the processor 2022 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

The BBU 2002 described above may be used to perform actions described in the previous method embodiments that are implemented internally by the network device, while the RRU 2001 may be used to perform actions described in the previous method embodiments that the network device sends to or receives from the terminal device. Please refer to the description of the previous embodiment of the method, which is not repeated herein.

The network device is not limited to the embodiment shown in fig. 20, and may be in another embodiment: for example: the antenna comprises a BBU (baseband unit) and an Adaptive Radio Unit (ARU), or comprises a BBU and an Active Antenna Unit (AAU); the CPE may be a Customer Premise Equipment (CPE) or another type, and the present application is not limited thereto.

It should be understood that the network device 40 shown in fig. 20 is capable of implementing the network device functions involved in the method embodiments of fig. 6-16. The operations and/or functions of the units in the network device 40 are respectively for implementing the corresponding processes executed by the network device in the method embodiments of the present application. To avoid repetition, detailed description is appropriately omitted herein. The structure of the network device illustrated in fig. 20 is only one possible form, and should not limit the embodiments of the present application in any way. This application does not exclude the possibility of other forms of network device architecture that may appear in the future.

The network device in the foregoing various apparatus embodiments corresponds to the terminal device or the network device in the terminal device and method embodiments, and the corresponding module or unit executes the corresponding steps, for example, the communication unit (transceiver) executes the steps of receiving or transmitting in the method embodiments, and other steps besides transmitting and receiving may be executed by the processing unit (processor). The functions of the specific elements may be referred to in the respective method embodiments. The number of the processors may be one or more.

Referring to fig. 21, fig. 21 is a schematic diagram of a data transmission apparatus 50 proposed in the present application. As shown in fig. 21, the apparatus 50 includes a receiving unit 2110, a processing unit 2120, and a transmitting unit 2130.

A receiving unit 2110, configured to receive a first DCI and a first data packet sent by the network device, where the first DCI is processed through an identifier of a terminal device, and the first data packet includes a data packet sent to the terminal device;

a processing unit 2120, configured to descramble the first DCI based on the identifier of the terminal device, and obtain the first data packet;

a sending unit 2130, configured to send a third DCI and the first data packet to the terminal device, where the third DCI is processed via an identifier of the terminal device.

The apparatus 50 corresponds exactly to the intermediate node in the method embodiment, and the apparatus 50 may be the intermediate node in the method embodiment, or a chip or a functional module inside the intermediate node in the method embodiment. The corresponding elements of the apparatus 50 are for performing the corresponding steps performed by the intermediate node in the method embodiments shown in fig. 6-16.

Wherein, the receiving unit 2110 in the apparatus 50 performs the step of receiving by the intermediate node in the method embodiment. For example, step S612 in fig. 6 is executed to receive the identifier of the terminal device sent by the network device; step S620 in fig. 6 is further executed to receive the first DCI and the first data packet sent by the network device; step S811 in fig. 8 is also executed to receive the identifier of the intermediate node sent by the network device; step S813 in fig. 8 is also executed to receive the identifiers of the N terminal devices sent by the network device; step S820 in fig. 8 is further executed to receive a second DCI and a second data packet sent by the network device; step S1330 in fig. 13 is further executed to receive a handover command sent by the network device; step S1511 in fig. 15 is further executed to receive fourth indication information sent by the network device; step S1510 in fig. 15 is further executed to receive an association response message sent by the network device; step S1520 in fig. 15 is further executed to receive a second association request message sent by the terminal device; step S1610 in fig. 16 is further executed to receive fourth indication information sent by the network device; step S1620 in fig. 16 is further executed to receive the second association request message sent by the terminal device.

The processing unit 2120 in the apparatus 50 performs the steps implemented or processed internally by the intermediate node in the method embodiment. For example, step S630 in fig. 6 is executed to descramble the first DCI to obtain a first data packet; step S830 in fig. 8 is also executed to descramble the second DCI, and decompose the second data packet; step S1410 in fig. 14 is further executed to determine that the terminal device fails to connect; step S1630 in fig. 16 is also performed to determine the identity of the terminal device.

A sending unit 2130 in the apparatus 50 executes the steps sent by the intermediate node in the method embodiment. For example, step S613 in fig. 6 is executed to send the identifier of the terminal device to the network device; step S613 in fig. 6 is also executed to assign the identifier of the terminal device to the terminal device; step S640 in fig. 6 is further executed to send the third DCI and the first data packet to the terminal device; step S815 in fig. 8 is further executed to send the identifiers of the N terminal devices to the network device; step S814 in fig. 8 is further executed to assign the identifier of the terminal device to the terminal device; step S840 in fig. 8 is also executed to send a fourth DCI and a third data packet to the terminal device; step S1340 in fig. 13 is also executed to send a handover instruction to the terminal device; step S1420 in fig. 14 is also executed to send connection failure indication information to the network device; step S1512 in fig. 15 is further executed to send the request message to the network device, or step S1513 in fig. 15 is further executed to send sixth indication information to the core network device; step S1510 in fig. 15 is further executed to send a first association request message to the network device; step S1540 in fig. 15 is also executed to send the identifier of the terminal device to the terminal device; step S1611 in fig. 16 is further executed to send the request message to the network device, or step S1612 in fig. 16 is further executed to send sixth indication information to the core network device; step S1640 in fig. 16 is also executed, sending the identification of the terminal device to the terminal device.

The receiving unit 2110 and the transmitting unit 2130 may constitute a transceiving unit, and have both receiving and transmitting functions. The processing unit 2120 may be a processor, among others. The transmitting unit 2130 may be a receiver. The receiving unit 2110 may be a transmitter. The receiver and transmitter may be integrated together to form a transceiver.

Referring to fig. 22, fig. 22 is a schematic structural diagram of an intermediate node 60 suitable for use in embodiments of the present application. The intermediate node 60 may be used in the system shown in fig. 1. For ease of illustration, fig. 22 shows only the main components of the intermediate node. As shown in fig. 22, the apparatus 60 may include a processing unit 610 (i.e., an example of the processing unit 520 in fig. 21) and a storage unit 2220. The storage unit 2220 is used to store instructions.

The processing unit 2210 is configured to execute the instructions stored by the storage unit 2220, so as to enable the apparatus 60 to implement the steps performed by the intermediate node in the method as described above.

Further, the apparatus 60 may further include an input port 2230 and an output port 2240 (i.e., an example of the receiving unit 2110 and the transmitting unit 2130 in fig. 21). Further, the processing unit 2210, the storage unit 2220, the input port 2230 and the output port 2240 may communicate with each other via the interconnection paths, transferring control and/or data information. The storage unit 2220 is configured to store a computer program, and the processing unit 2210 may be configured to call and run the computing program from the storage unit 2220, so as to control the input port 2230 to receive information and the output port 2240 to send information, thereby completing the steps of the intermediate node in the above method. The storage unit 2220 may be integrated into the processing unit 2210, or may be provided separately from the processing unit 2210.

Optionally, the input port 2230 is a receiver and the output port 2240 is a transmitter. Wherein the receiver and the transmitter may be the same or different physical entities. When the same physical entity, may be collectively referred to as a transceiver.

Those skilled in the art will appreciate that fig. 22 shows only one memory and processor for ease of illustration. In an actual intermediate node, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, and the like, which is not limited in this application.

An embodiment of the present application further provides a communication system, which includes the foregoing network device, one or more terminal devices, and one or more intermediate nodes.

The present application also provides a computer-readable storage medium having stored therein instructions, which when executed on a computer, cause the computer to perform the steps performed by the network device in the methods as described above in fig. 6-16.

The present application also provides a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to perform the steps performed by the terminal device in the methods shown in fig. 6-16.

The present application also provides a computer-readable storage medium having stored therein instructions that, when executed on a computer, cause the computer to perform the steps performed by the intermediate node in the methods described above and shown in fig. 6-16.

The present application also provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the steps performed by the network device in the methods shown in fig. 6-16.

The present application also provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the steps performed by the terminal device in the methods as shown in fig. 6-16.

The present application also provides a computer program product comprising instructions for causing a computer to perform the steps performed by the intermediate node in the methods shown in fig. 6-16, when the computer program product runs on a computer.

The application also provides a chip comprising a processor. The processor is configured to read and execute the computer program stored in the memory to perform corresponding operations and/or procedures performed by the terminal device in the data transmission method and the configuration identification method provided by the present application. Optionally, the chip further comprises a memory, the memory is connected with the processor through a circuit or a wire, and the processor is used for reading and executing the computer program in the memory. Further optionally, the chip further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving data and/or information needing to be processed, and the processor acquires the data and/or information from the communication interface and processes the data and/or information. The communication interface may be an input output interface.

The application also provides a chip comprising a processor. The processor is configured to call and execute the computer program stored in the memory to perform the corresponding operations and/or procedures performed by the network device in the data transmission method and the configuration identification method provided by the present application. Optionally, the chip further comprises a memory, the memory is connected with the processor through a circuit or a wire, and the processor is used for reading and executing the computer program in the memory. Further optionally, the chip further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving data and/or information needing to be processed, and the processor acquires the data and/or information from the communication interface and processes the data and/or information. The communication interface may be an input output interface.

The application also provides a chip comprising a processor. The processor is configured to call and execute the computer program stored in the memory to perform the corresponding operations and/or procedures performed by the intermediate node in the data transmission method and the configuration identification method provided by the present application. Optionally, the chip further comprises a memory, the memory is connected with the processor through a circuit or a wire, and the processor is used for reading and executing the computer program in the memory. Further optionally, the chip further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving data and/or information needing to be processed, and the processor acquires the data and/or information from the communication interface and processes the data and/or information. The communication interface may be an input output interface.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of data transmission, the method comprising:

the network equipment determines a first DCI and a first data packet, wherein the first DCI is processed through the identifier of the terminal equipment, and the first data packet comprises the data packet sent to the terminal equipment;

and the network equipment sends the first DCI and the first data packet to an intermediate node.

2. The method of claim 1, wherein prior to the network device determining the first DCI and first packet, the method further comprises:

the network equipment distributes the identification of the terminal equipment to the terminal equipment; the network equipment sends the identifier of the terminal equipment to the intermediate node; or,

3. The method of claim 2, further comprising:

the network equipment sends a switching request to target network equipment, wherein the switching request is used for requesting the intermediate node and the terminal equipment to be accessed to the target network equipment, and the switching request carries an identifier of the terminal equipment;

the network equipment receives a switching response sent by the target network equipment, wherein the switching response comprises first indication information, and the first indication information is used for indicating that the identifier of the terminal equipment needs to be updated;

and the network equipment sends a switching command to the intermediate node, wherein the switching command comprises the first indication information.

4. The method according to claim 1 or 2, characterized in that the method further comprises:

and the network equipment receives connection failure indication information sent by the intermediate node, wherein the connection failure indication information is used for indicating the connection failure between the terminal equipment and the intermediate node.

5. A method of data transmission, the method comprising:

the method comprises the steps that an intermediate node receives a first DCI and a first data packet sent by network equipment, wherein the first DCI is processed through an identifier of terminal equipment, and the first data packet comprises the data packet sent to the terminal equipment;

The intermediate node descrambles the first DCI based on the identifier of the terminal equipment to obtain the first data packet;

and the intermediate node sends a third DCI and the first data packet to the terminal equipment, wherein the third DCI is processed through the identifier of the terminal equipment.

6. The method of claim 5, wherein before the intermediate node receives the first DCI and the first data packet sent by the network device, the method further comprises:

the intermediate node distributes the identifier of the terminal equipment to the terminal equipment; the intermediate node sends the identifier of the terminal equipment to the network equipment;

or,

and the intermediate node receives the identifier of the terminal equipment sent by the network equipment.

7. The method of claim 6, further comprising:

the intermediate node receives a switching command sent by the network equipment, wherein the switching command comprises first indication information, and the first indication information is used for indicating that the identifier of the terminal equipment needs to be updated;

and the intermediate node sends the first indication information to the terminal equipment.

8. The method according to claim 6 or 7, characterized in that the method further comprises:

And the intermediate node sends connection failure indication information to the network equipment, wherein the connection failure indication information is used for indicating the connection failure between the terminal equipment and the intermediate node.

9. A method of data transmission, the method comprising:

the terminal equipment receives third DCI and a first data packet sent by an intermediate node, wherein the third DCI is processed through the identifier of the terminal equipment, and the first data packet comprises the data packet sent to the terminal equipment;

and the terminal equipment descrambles the third DCI based on the identifier of the terminal equipment to obtain the first data packet.

10. The method of claim 9, wherein before the terminal device receives the third DCI and the first data packet transmitted by the intermediate node, the method further comprises:

the terminal equipment receives the identifier of the terminal equipment distributed by the intermediate node;

or,

and the terminal equipment receives the identifier of the terminal equipment distributed by the network equipment.

11. The method according to claim 9 or 10, characterized in that the method further comprises:

and the terminal equipment receives first indication information sent by the intermediate node, wherein the first indication information is used for indicating that the identifier of the terminal equipment needs to be updated.

12. An apparatus for data transmission, the apparatus comprising:

a processing unit, configured to determine a first DCI and a first data packet, where the first DCI is processed via an identifier of a terminal device, and the first data packet includes a data packet sent to the terminal device;

a sending unit, configured to send the first DCI and the first data packet to the intermediate node.

13. The apparatus of claim 12, wherein before the processing unit determines the first DCI and the first data packet, the processing unit is further configured to assign an identity of the terminal device to the terminal device;

the sending unit is further configured to send the identifier of the terminal device to the intermediate node; or,

the device further comprises:

and the receiving unit is used for receiving the identifier of the terminal equipment sent by the intermediate node.

14. The apparatus according to claim 13, wherein the sending unit is further configured to send a handover request to a target network device, where the handover request is used to request that the intermediate node and the terminal device access the target network device, and an identifier of the terminal device is carried in the handover request;

The receiving unit is further configured to receive a handover response sent by the target network device, where the handover response includes first indication information, and the first indication information is used to indicate that an identifier of the terminal device needs to be updated;

the sending unit is further configured to send a handover command to the intermediate node, where the handover command includes the first indication information.

15. The apparatus according to claim 12 or 13, wherein the receiving unit is further configured to receive connection failure indication information sent by the intermediate node, where the connection failure indication information is used to indicate a connection failure between the terminal device and the intermediate node.

16. An apparatus for data transmission, the apparatus comprising:

a receiving unit, configured to receive a first DCI and a first data packet sent by a network device, where the first DCI is processed via an identifier of a terminal device, and the first data packet includes a data packet sent to the terminal device;

a processing unit, configured to descramble the first DCI based on the identifier of the terminal device, to obtain the first data packet;

and a sending unit, configured to send a third DCI and the first data packet to the terminal device, where the third DCI is processed via an identifier of the terminal device.

17. The apparatus according to claim 16, wherein before the receiving unit receives the first DCI and the first data packet sent by the network device, the processing unit is further configured to assign an identifier of the terminal device to the terminal device;

the sending unit is further configured to send the identifier of the terminal device to the network device; or,

the receiving unit is further configured to receive the identifier of the terminal device sent by the network device.

18. The apparatus according to claim 17, wherein the receiving unit is further configured to receive a handover command sent by the network device, where the handover command includes first indication information, and the first indication information is used to indicate that the identifier of the terminal device needs to be updated;

the sending unit is further configured to send the first indication information to the terminal device.

19. The apparatus according to claim 17 or 18, wherein the sending unit is further configured to send connection failure indication information to the network device, where the connection failure indication information is used to indicate a connection failure between the terminal device and the intermediate node.

20. An apparatus for data transmission, the apparatus comprising:

A receiving unit, configured to receive a third DCI sent by an intermediate node and the first data packet, where the third DCI is processed via an identifier of the terminal device, and the first data packet includes a data packet sent to the terminal device;

and the processing unit is used for descrambling the third DCI based on the identifier of the terminal equipment to acquire the first data packet.

21. The apparatus according to claim 20, wherein before the receiving unit receives the third DCI and the first data packet transmitted by the intermediate node, the receiving unit is further configured to receive an identifier of the terminal device assigned by the intermediate node;

or,

the receiving unit is further configured to receive the identifier of the terminal device allocated by the network device.

22. The apparatus according to claim 20 or 21, wherein the receiving unit is further configured to receive first indication information sent by the intermediate node, where the first indication information is used to indicate that the identity of the terminal device needs to be updated.

23. A communication device, comprising:

a memory for storing a computer program;

a transceiver for performing a transceiving step;

A processor for invoking and running the computer program from the memory, causing the communication device to perform the method of any of claims 1-11.

24. A computer-readable storage medium, comprising: the computer readable medium stores a computer program; the computer program, when run on a computer, causes the computer to perform the method of any one of claims 1-11.

25. A communication system, comprising:

apparatus for data transmission according to any one of claims 12 to 15, apparatus for data transmission according to any one of claims 16 to 19 and apparatus for data transmission according to any one of claims 20 to 22.