CN114390622A

CN114390622A - Information transmission method and device and communication equipment

Info

Publication number: CN114390622A
Application number: CN202011142174.3A
Authority: CN
Inventors: 王达
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2022-04-22

Abstract

The invention provides an information transmission method, an information transmission device and communication equipment, which are used for solving the problems of how to reduce the switching time delay of a transmission service and avoid the interruption of the transmission service in the switching process of a relay node. The method comprises the following steps: the communication equipment starts to send uplink data packets to a target cell or a target relay node under the condition that a first condition is met; and/or the communication equipment stops sending the uplink data packet to the source cell or the source relay node under the condition that the second condition is met. The invention can ensure that the uplink data transmission can be switched from the source cell to the target cell in time, thereby reducing the switching time delay of the transmission service and avoiding the interruption of the transmission service in the switching process.

Description

Information transmission method and device and communication equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to an information transmission method, an information transmission device, and a communication apparatus.

Background

Since the 5G system uses a higher frequency spectrum than the 4G system, the coverage area of the base station is reduced, and thus many techniques for solving the coverage area of the base station have been developed. For example, the IAB (Integrated Access and Backhaul) network technology achieves the purpose of expanding the coverage of a base station by a wireless signal relay manner among a plurality of base station nodes, and a link between nodes may be referred to as a Backhaul link, which is a network networking mode for solving the problem of the coverage of the base station in the future 5G. As another example, a User Equipment (UE) Relay to a Network (UE-to-Network Relay) is introduced. The relay itself may be a terminal having a relay function. For UE-to-Network Relay, the interface between the Relay UE and the Network uses the Uu interface, and the interface between the Remote terminal Remote UE (i.e. the relayed terminal) uses the PC5 interface (also called direct communication interface, described as sildelink, SL in the protocol). The link between the relay and the network may be referred to as a Backhaul link for the relayed UE. The above techniques for solving the coverage of the base station all introduce a relay, which may be a base station with a relay function or a terminal with a relay function.

With the further development of the above technology, the relay node in the above technology can also be mobile, for example, the IAB node in the IAB technology is installed on a car or a train. When the IAB node is handed over from one parent node to another parent node, the configuration used by the IAB node needs to be reconfigured, and since the service can be normally transmitted after the reconfiguration is completed after the handover process, the delay or interruption of the transmission service may be caused. For another example, in the UE-to-Network Relay technology, the Relay UE may be a mobile device, which may also be handed over from one cell to another cell, and may also cause delay or interruption of transmission service.

At present, how to reduce the switching delay of the transmission service and avoid the interruption of the transmission service in the switching process becomes a problem to be solved urgently in the switching process of the relay node.

Disclosure of Invention

The invention aims to provide an information transmission method, an information transmission device and communication equipment, which are used for solving the problems of how to reduce the switching time delay of transmission services and avoiding the interruption of the transmission services in the switching process of a relay node.

In order to achieve the above object, an embodiment of the present invention provides an information transmission method, which is applied to a communication device, where the communication device is a relay node or a terminal, and the method includes:

the communication equipment starts to send an uplink data packet to a target cell or a target relay node under the condition that a first condition is met; and/or the presence of a gas in the gas,

and the communication equipment stops sending the uplink data packet to the source cell or the source relay node under the condition of meeting the second condition.

Wherein the first condition or the second condition comprises at least one of:

after sending a connection establishment completion message to a target cell or a target relay node;

after receiving a Radio Resource Control (RRC) reconfiguration message sent by a target cell or a target relay node;

after an RRC reconfiguration completion message is sent to a target cell or a target relay node;

after receiving a first uplink authorization sent by a target cell or a target relay node;

and after receiving the first downlink scheduling sent by the target cell or the target relay node.

Wherein the communication device is a relay node; the first condition or the second condition further comprises at least one of:

after sending an F1 establishment request message to a target cell or a target relay node or a target centralized unit;

after receiving an F1 establishment completion message sent by a target cell, a target relay node or a target centralized unit;

after receiving an F1 reconfiguration message sent by a target cell, a target relay node or a target centralized unit;

and sending an F1 reconfiguration completion message to the target cell or the target relay node or the target centralized unit.

Wherein the communication device is a relay node;

before starting to send an uplink data packet to the target cell or the target relay node, the method further includes:

acquiring switched routing information and next hop node information, wherein the switched routing information is configured by a source cell, a source relay node, a target cell or a target relay node;

sending an uplink data packet to a target cell or a target relay node, comprising:

and sending an uplink data packet to a target cell or a target relay node based on the switched routing information and the next hop node information.

Wherein, the communication equipment is a terminal;

encrypting the uplink data packet by using a first secret key to obtain an encrypted uplink data packet, wherein the first secret key is a secret key used in communication between the terminal and a target cell or a target relay node;

determining a target Data Radio Bearer (DRB);

and sending the encrypted uplink data packet to a target cell or a target relay node through the target DRB.

The relay node is an integrated access backhaul IAB node or a relay terminal.

Wherein, the connection establishment completion message and/or the RRC reconfiguration completion message are triggered by the RRC layer; the RRC reconfiguration message is received by the RRC layer;

when the communication device is a relay node, the RRC layer of the relay node informs an adaptation layer to start sending an uplink data packet to a target cell or a target relay node, and/or stops sending the uplink data packet to a source cell or a source relay node; alternatively, the first and second electrodes may be,

and under the condition that the communication equipment is the terminal, the RRC layer of the relay node informs the PDCP layer of the grouped data convergence protocol to start to send an uplink data packet to the target cell or the target relay node, and/or stops sending the uplink data packet to the source cell or the source relay node.

Wherein, the first uplink authorization and/or the first downlink scheduling are received by a Media Access Control (MAC) layer;

when the communication equipment is a relay node, the MAC layer of the relay node informs an adaptation layer to start sending an uplink data packet to a target cell or a target relay node, and/or stops sending the uplink data packet to a source cell or a source relay node; alternatively, the first and second electrodes may be,

and under the condition that the communication equipment is a terminal, the MAC layer of the relay node informs a packet data convergence protocol PDCP layer of starting to send an uplink data packet to a target cell or a target relay node and/or stops sending the uplink data packet to a source cell or a source relay node.

Wherein the F1 setup request message and/or the F1 reconfiguration complete message are triggered by the F1 entity; the F1 setup complete message and/or F1 reconfiguration message is received by the F1 entity;

wherein, the F1 entity of the relay node notifies the adaptation layer to start sending the uplink data packet to the target cell or the target relay node, and/or stops sending the uplink data packet to the source cell or the source relay node.

In order to achieve the above object, an embodiment of the present invention further provides a communication device, including: memory, transceiver, processor: a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

the communication equipment starts to send uplink data packets to a target cell or a target relay node through a transceiver under the condition that a first condition is met; and/or the presence of a gas in the gas,

Wherein the first condition or the second condition comprises at least one of:

Wherein the communication device is a relay node;

the first condition or the second condition further comprises at least one of:

Wherein the communication device is a relay node;

the processor is further configured to:

and sending an uplink data packet to a target cell or a target relay node through a transceiver based on the switched routing information and the next hop node information.

Wherein, the communication equipment is a terminal;

the processor is further configured to:

determining a target Data Radio Bearer (DRB);

and sending the encrypted uplink data packet to a target cell or a target relay node through the transceiver by the target DRB.

The relay node is an integrated access backhaul IAB node or a relay terminal.

In order to achieve the above object, an embodiment of the present invention further provides an information transmission apparatus, including:

the transmission module is used for starting to send an uplink data packet to a target cell or a target relay node under the condition that a first condition is met; and/or stopping sending the uplink data packet to the source cell or the source relay node under the condition that the second condition is met.

In order to achieve the above object, an embodiment of the present invention further provides a processor-readable storage medium, where a computer program is stored, where the computer program is used to enable the processor to execute the steps of the information transmission method described above.

The technical scheme of the invention at least has the following beneficial effects:

in the above technical solution of the embodiment of the present invention, when the communication device meets the first condition, the communication device starts sending the uplink data packet to the target cell or the target relay node, and/or when the communication device meets the second condition, the communication device stops sending the uplink data packet to the source cell or the source relay node, so that it can be ensured that the uplink data transmission can be timely switched from the source cell to the target cell, thereby reducing the switching delay of the transmission service and avoiding the interruption of the transmission service in the switching process.

Drawings

Fig. 1 is a schematic diagram of a conventional IAB network topology;

FIG. 2 is a diagram of a data plane protocol stack of a conventional IAB node;

FIG. 3 is a data plane protocol stack corresponding to a UE-to-Network Relay scenario;

FIG. 4 is a diagram of a protocol stack of a conventional DAPS technique;

FIG. 5 is a flowchart illustrating an information transmission method according to an embodiment of the present invention;

fig. 6 is a schematic view of a scene to which the information transmission method according to the embodiment of the present invention is applied;

fig. 7 is a block diagram of a communication apparatus according to an embodiment of the present invention;

fig. 8 is a block diagram of an information transmission apparatus according to an embodiment of the present invention.

Detailed Description

The term "and/or" in the embodiments of the present invention describes an association relationship of associated objects, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the method of the present invention is applicable to the communication scenario of the IAB Network, and is also applicable to the UE-to-Network Relay scenario. For ease of understanding, the IAB network is described in detail below in conjunction with fig. 1.

Fig. 1 is an IAB network topology diagram, and in an IAB network deployment, an IAB donor (an IAB host node or a central control node), an IAB node and a UE are included. The IAB donor is used for connecting the core network, returning the information of the IAB node and the UE to the core network and transmitting the information of the core network to the IAB node and the UE. The IAB donor is also responsible for managing IAB nodes throughout the IAB network.

The IAB node is responsible for relaying and transmitting information of the UE to the IAB donor and relaying and transmitting information of the IAB donor to the UE through a radio link (Uu interface). The IAB nodes and the IAB donor are connected through wireless links, namely Uu interfaces.

The relay function of the IAB node is implemented by a BAP layer (Backhaul attachment Protocol layer) in the IAB node.

In the existing IAB network topology, one IAB node (IAB node) is composed of two parts, one part is a DU part in an IAB MT (IAB Mobile Termination) pair connected to a base station or an IAB node, and the base station or the IAB node is called its parent node; the other part is an MT part of an IAB DU (IAB Distributed Unit) to which a UE (User Equipment) or an IAB node is connected downward, and the UE or the IAB MT node is called a child node thereof.

In fig. 1, IAB node 1 is a parent node of IAB node 2, IAB node 3 is a child node of IAB node 2, and IAB node 3 is a descendant node of IAB node 1.

As shown in fig. 2, the protocol stack of the IAB node includes a physical PHY layer, a Media Access Control (MAC) layer, a Radio Link Control (RLC) layer, and a packet Access protocol (BAP) layer.

It should be noted that, specifically, the IAB node handover refers to a handover of an IAB node from a source parent node to a target parent node. IAB node handover involves two handover scenarios. Firstly, the IAB node is switched from a source parent node to a target parent node, but the connected donor CU is not changed, only the donor DU different from the lower side of the donor CU is changed, and the switching is intra-CU switching; and the other is that the IAB node is switched from the source parent node to the target parent node, the connected donor CU is changed, namely the source donor CU is switched to the target donor CU, and the switching is inter-CU switching.

Here, for the UE-to-Network Relay scenario, the protocol stack of the Relay UE consists of a PHY layer, a MAC layer, an RLC layer, and an ADAPT layer, as shown in fig. 3.

Currently, when a DAPS (Dual Active Protocol Stack) is used for cell handover of a UE, handover delay can be reduced. In the switching process of the UE, the UE establishes connection with the target cell and maintains the connection with the source cell, when the MAC layer receives the uplink scheduling UL grant sent by the first target cell, the newly transmitted data of the uplink data is switched to the link of the target cell to be sent, and the previous retransmission of the uplink data can be further continuously transmitted on the link of the source cell. Therefore, the sending of the uplink data is not interrupted, and the switching time delay is reduced.

The protocol stack of the DAPS technique is shown in fig. 4, and the UE uses dual protocol stacks, which correspond to the source cell and the target cell, respectively. The retransmission of the previous uplink data may continue to be transmitted on the link of the source cell while the new transmission of uplink data is transmitted on the link of the target cell.

The inventors have found in their research that the DAPS technique is only applicable to terminals and not to relay nodes. Because neither the IAB node nor the relay UE has a Packet Data Convergence Protocol (PDCP) layer, how to reduce the switching delay of the transmission service in the switching process of the relay node, and avoid interruption of the transmission service in the switching process becomes a problem to be solved urgently.

In order to solve the above problem, embodiments of the present invention provide an information transmission method, an information transmission apparatus, and a communication device. The method and the device are based on the same application concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

As shown in fig. 5, a schematic flow chart of an information transmission method provided in an embodiment of the present invention is a method, where the method is applied to a communication device, where the communication device is a relay node or a terminal, and the method may include:

step 501, the communication device starts to send an uplink data packet to a target cell or a target relay node when a first condition is met; and/or the presence of a gas in the gas,

Optionally, the relay node is an integrated access backhaul IAB node or a relay terminal.

It should be noted that, in a scenario where the method of the embodiment of the present invention is applied to an IAB network, the target cell is a cell of a target parent node accessed in a relay node handover process, or the target cell is a target cell accessed in a terminal handover process. The target relay node is a target relay node accessed in the relay node switching process, or the target relay node is a target relay node accessed in the terminal switching process.

The method of the embodiment of the invention is applied to a UE-to-Network Relay scene, and the target cell is a Relay node or a target cell accessed in a terminal switching process. The target relay node is a relay node or a target relay node accessed in the terminal switching process.

It should be noted that, during the handover of the relay node or the terminal, the connection with the source cell may be maintained without interruption, and the connection with the target cell may be established at the same time.

Here, the first condition and the second condition may be the same or different. That is, the start of the transmission of the uplink packet to the target cell or the target relay node may be performed simultaneously with or not simultaneously with the stop of the transmission of the uplink packet to the source cell or the source relay node (preferably, after the start of the transmission of the uplink packet to the target cell or the target relay node, the transmission of the uplink packet to the source cell or the source relay node is stopped).

Here, the uplink data packet is a first uplink data packet, the first uplink data packet and a second uplink data packet are different data packets, and the second uplink data packet is an uplink data packet previously sent to the source cell or the source relay node.

That is, the uplink data packet to be transmitted here refers to a newly transmitted uplink data packet. The transmission to the source cell may continue for the retransmission of uplink data packets that have been previously transmitted to the source cell.

According to the information transmission method provided by the embodiment of the invention, the communication equipment starts to send the uplink data packet to the target cell or the target relay node under the condition that the first condition is met, and/or the communication equipment stops sending the uplink data packet to the source cell or the source relay node under the condition that the second condition is met, so that the uplink data can be ensured to be timely switched from the source cell to the target cell, the switching time delay of the transmission service is reduced, and the interruption of the transmission service in the switching process is avoided.

Optionally, the first condition or the second condition comprises at least one of:

Note that the first condition or the second condition is applicable to the case where the communication device is a relay node or the case where the communication device is a terminal.

Here, the relay node or the UE needs to access the target cell or the target relay node and establish a connection in the handover process, and after the relay node or the UE sends a connection establishment completion message to the target cell or the target relay node, it indicates that the connection between the relay node or the UE and the target cell or the target relay node is already established; at this time, the relay node or the UE may start to transmit the uplink data packet to the target cell or the target relay node, or stop transmitting the uplink data packet to the source cell or the source relay node.

In the switching process, after the relay node or the UE accesses the target cell or the target relay node and establishes connection, the relay node or the UE receives an RRC reconfiguration message sent by the target cell or the target relay node so as to configure the RRC connection; at this time, the relay node or the UE may start to transmit the uplink data packet to the target cell or the target relay node, or stop transmitting the uplink data packet to the source cell or the source relay node.

In the switching process, after receiving an RRC reconfiguration message of a source cell, a relay node or UE starts to access a target cell or a target relay node and establishes connection, and the relay node or UE sends an RRC reconfiguration completion message to the target cell or the target relay node; or, after the relay node or the UE receives the RRC reconfiguration message sent by the target cell or the target relay node during the handover process, the relay node or the UE sends an RRC reconfiguration complete message to the target cell or the target relay node, indicating that the RRC configuration between the relay node or the UE and the target cell or the target relay node is completed; at this time, the relay node or the UE may start to transmit the uplink data packet to the target cell or the target relay node, or stop transmitting the uplink data packet to the source cell or the source relay node.

In the switching process, after the relay node or the UE is accessed to the target cell or the target relay node and the connection is established, the relay node or the UE receives a first uplink grant (UL grant) sent by the target cell or the target relay node, and the relay node or the UE can start to send uplink data to the target cell or the target relay node; at this time, the relay node or the UE may start to transmit the uplink data packet to the target cell or the target relay node, or stop transmitting the uplink data packet to the source cell or the source relay node.

In the switching process of the relay node or the UE, after accessing a target cell or a target relay node and establishing connection, the relay node or the UE receives a first downlink scheduling DL assignment sent by the target cell or the target relay node, which indicates that the relay node or the UE can start to receive downlink data sent by the target cell or the target relay node; at this time, the relay node or the UE may start to transmit the uplink data packet to the target cell or the target relay node, or stop transmitting the uplink data packet to the source cell or the source relay node.

Based thereon, optionally, the communication device is a relay node; the first condition or the second condition further comprises at least one of:

Note that the first condition or the second condition is applicable to the communication device being a relay node.

For example, the interface between the relay node and the concentrator CU is referred to as an F1 interface, and the connection between the relay node and the concentrator CU is referred to as an F1 connection.

Here, after the relay node accesses the target cell or the target relay node and establishes a connection during the handover, the relay node sends an F1 establishment request message to the target cell or the target relay node or the target donor CU, so as to establish an F1 connection; at this time, the relay node may start to transmit the uplink data packet to the target cell or the target relay node, or stop transmitting the uplink data packet to the source cell or the source relay node.

In the switching process of the relay node, after accessing a target cell or a target relay node and establishing connection, the relay node receives an F1 establishment completion message sent by the target cell or the target relay node or a target donor CU, and indicates that the F1 connection between the relay node and the target cell or the target relay node or the target donor CU is established; at this time, the relay node may start to transmit the uplink data packet to the target cell or the target relay node, or stop transmitting the uplink data packet to the source cell or the source relay node.

In the switching process of the relay node, after accessing a target cell or a target relay node and establishing connection, the relay node receives an F1 reconfiguration message sent by the target cell or the target relay node or a target donor CU, so as to configure the F1 connection; at this time, the relay node may start to transmit the uplink data packet to the target cell or the target relay node, or stop transmitting the uplink data packet to the source cell or the source relay node.

In the switching process of the relay node, after accessing a target cell or a target relay node and establishing connection, the relay node sends an F1 reconfiguration completion message to the target cell or the target relay node or the target donor CU, which indicates that the F1 configuration of the relay node and the target cell or the target relay node or the target donor CU is completed; at this time, the relay node may start to transmit the uplink data packet to the target cell or the target relay node, or stop transmitting the uplink data packet to the source cell or the source relay node.

As an optional implementation manner, the communication device is a relay node; before starting to send an uplink data packet to the target cell or the target relay node, the method of the embodiment of the present invention may further include:

acquiring switched routing information and next hop node information, wherein the switched routing information is configured by a source cell or a target cell;

correspondingly, sending the uplink data packet to the target cell or the target relay node includes:

It should be noted that, for the relay node, the adaptation layer of the relay node needs to convert the route, that is, an adaptation layer packet header is added according to the route information (new route information) after the handover and a next hop node is determined, and based on the new route information and the determined next hop node, the uplink packet is sent to the target cell or the target relay node.

Here, the route information after handover may be default route information configured by the source cell, the source relay node, the target cell, or the target relay node, or new route information configured by the target cell or the target relay node.

As an optional implementation manner, the communication device is a terminal; before starting to send an uplink data packet to the target cell or the target relay node, the method of the embodiment of the present invention may further include:

determining a target Data Radio Bearer (DRB);

It should be noted that, for the terminal, the PDCP layer of the terminal needs to encrypt the data packet by using a new key, and determine which DRB to send on, so as to send the uplink data packet to the target cell or the target relay node. The new key is a new key used for communication between the terminal and the target cell or the target relay node.

Optionally, the connection establishment complete message and/or the RRC reconfiguration complete message is triggered by the RRC layer; the RRC reconfiguration message is received by the RRC layer;

Here, the connection establishment completion message is triggered by the RRC layer, the RRC reconfiguration message is received by the RRC layer, and the RRC reconfiguration completion message is triggered by the RRC layer, so for the relay node, the RRC layer needs to notify the adaptation layer that the adaptation layer can start sending the uplink packet to the target cell or the target relay node, or stop sending the uplink packet to the source cell or the source relay node, so that the adaptation layer performs route switching and determines a new next hop node; for the terminal, the RRC layer needs to notify the PDCP layer that the uplink data packet can be sent to the target cell or the target relay node, or stop sending the uplink data packet to the source cell or the source relay node, so that the PDCP layer performs key conversion and determines a new DRB.

Optionally, the first uplink grant and/or the first downlink schedule are received by a medium access control, MAC, layer;

Here, the uplink grant is received by the MAC layer, and the downlink schedule is received by the MAC layer, so for the relay node, the MAC layer needs to notify the adaptation layer that the adaptation layer can start sending the uplink data packet to the target cell or the target relay node, or stop sending the uplink data packet to the source cell or the source relay node, so that the adaptation layer performs route conversion and determines a new next hop node; for the terminal, the MAC layer needs to notify the PDCP layer that the uplink data packet can start to be sent to the target cell or the target relay node, or stop sending the uplink data packet to the source cell or the source relay node, so that the PDCP layer performs key conversion and determines a new DRB.

Optionally, the F1 setup request message and/or the F1 reconfiguration complete message is triggered by the F1 entity; the F1 setup complete message and/or F1 reconfiguration message is received by the F1 entity;

Here, the F1 setup request message is triggered by the F1 entity, the F1 setup complete message is received by the F1 entity, the F1 reconfiguration message is received by the F1 entity, and the F1 reconfiguration complete message is triggered by the F1 entity, so that, for the relay node, the F1 entity needs to notify the adaptation layer that it can start sending uplink packets to the target cell or the target relay node or stop sending uplink packets to the source cell or the source relay node, so that the adaptation layer can perform route conversion and determine a new next hop node.

It should be noted that the F1 entity may be an F1 protocol layer.

The following is a specific description of the implementation of the method of the present invention with respect to an example.

As shown in fig. 6, in the migration node handover procedure, the source cell (cell of the relay node 2) and the target cell (cell of the relay node 4) are connected at the same time, or the source relay node (relay node 2) and the target relay node (relay node 4) are connected at the same time. The migration node may be an IAB relay node (IAB scenario) or a relay UE (UE-to-network relay scenario) or a UE (UE in the IAB scenario or the UE-to-network relay scenario).

1. The migration node receives an RRC reconfiguration message of a source cell or a source relay node and is used for indicating the migration node to access a target cell or a target relay node;

2. the migration node maintains the connection of a source cell or a source relay node and accesses a target cell or a target relay node;

3. the migration node establishes connection with a target cell or a target relay node and sends a connection establishment completion message to the target cell or the target relay node;

a) optionally, the relay node or the UE may start to send the uplink data packet to the target cell or the target relay node, or stop sending the uplink data packet to the source cell or the source relay node;

b) the RRC layer of the migration node informs the adaptation layer or the PDCP layer that the uplink data packet can be sent to the target cell or the target relay node, or stops sending the uplink data packet to the source cell or the source relay node;

4. the migration node receives an RRC reconfiguration message sent by a target cell or a target relay node;

it should be noted that: steps 4 and 5 are optional steps, and have no precedence order with the subsequent steps 6 to 11, and are possible to occur after step 3.

5. the migration node sends an RRC reconfiguration completion message to the target cell or the target relay node;

6. the migration node receives a first uplink grant (UL grant) sent by a target cell or a target relay node;

it should be noted that: step 6 has no precedence order with steps 4, 5 and 7-11, and can occur after step 3.

b) the MAC layer of the migration node informs the adaptation layer or the PDCP layer that the uplink data packet can be sent to the target cell or the target relay node, or stops sending the uplink data packet to the source cell or the source relay node;

7. the migration node receives a first downlink scheduling (DL assignment) sent by a target cell or a target relay node;

it should be noted that: no precedence order exists between step 7 and steps 4-6, and 8-11, and the steps can occur after step 3.

8. if the migration node is a relay node, the migration node sends an F1 establishment request message to a target cell or a target relay node or a target donor CU;

it should be noted that: steps 8 and 9 do not have a sequence with steps 4-7 and steps 10 and 11, and may occur after step 3.

a) Optionally, the relay node may start to send an uplink data packet to the target cell or the target relay node, or stop sending the uplink data packet to the source cell or the source relay node;

b) the F1 entity of the migration node informs the adaptation layer that the uplink data packet can be sent to the target cell or the target relay node, or stops sending the uplink data packet to the source cell or the source relay node;

9. if the migration node is a relay node, the migration node receives an F1 establishment completion message sent by a target cell, a target relay node or a target donor CU;

10. if the migration node is a relay node, the migration node receives an F1 reconfiguration message sent by a target cell, a target relay node or a target donor CU;

it should be noted that: steps 10 and 11 are optional steps, and have no precedence order with steps 4 to 7, and may occur after step 9.

11. if the migration node is a relay node, the migration node sends an F1 reconfiguration completion message to a target cell, a target relay node or a target donor CU;

b) the F1 entity of the migration node notifies the adaptation layer that the uplink data packet can be sent to the target cell or the target relay node, or stops sending the uplink data packet to the source cell or the source relay node.

As shown in fig. 7, an embodiment of the present invention further provides a communication device, where the communication device is a relay node or a terminal, and the communication device includes: memory 720, transceiver 700, processor 710: a memory 720 for storing a computer program; a transceiver 700 for transceiving data under the control of the processor 710; a processor 710 for reading the computer program in the memory 720 and performing the following operations:

Where the communication device is a relay node and the relay node is an IAB node, in fig. 7 the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 710 and various circuits of memory represented by memory 720 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 700 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, and the like. The processor 710 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 710 in performing operations.

The processor 710 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and may also have a multi-core architecture.

In the case that the communication device is a terminal or a relay node, and the relay node is a relay terminal, the user interface may also be an interface capable of externally connecting and internally connecting a desired device for different user devices, and the connected devices include, but are not limited to, a keypad, a display, a speaker, a microphone, a joystick, and the like.

The processor 710 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 710 in performing operations.

The processor is used for executing any one of the methods provided by the embodiment of the application according to the obtained executable instructions by calling the computer program stored in the memory. The processor and memory may also be physically separated.

Optionally, the communication device is a relay node;

the first condition or the second condition further comprises at least one of:

Optionally, the communication device is a relay node;

the processor 710 is further configured to:

Optionally, the communication device is a terminal;

the processor 710 is further configured to:

determining a target Data Radio Bearer (DRB);

According to the communication equipment provided by the embodiment of the invention, the communication equipment starts to send the uplink data packet to the target cell or the target relay node under the condition that the first condition is met, and/or stops sending the uplink data packet to the source cell or the source relay node under the condition that the second condition is met, so that the uplink data can be ensured to be timely switched from the source cell to the target cell, the switching time delay of the transmission service is reduced, and the interruption of the transmission service in the switching process is avoided.

It should be noted that, the apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.

As shown in fig. 8, an embodiment of the present invention further provides an information transmission apparatus, where the apparatus is applied to a communication device, where the communication device is a relay node or a terminal, and the apparatus may include:

a transmission module 801, configured to start sending an uplink data packet to a target cell or a target relay node when a first condition is met; and/or stopping sending the uplink data packet to the source cell or the source relay node under the condition that the second condition is met.

Optionally, the communication device is a relay node; the first condition or the second condition further comprises at least one of:

Optionally, the communication device is a relay node; the information transmission apparatus further includes:

an obtaining module, configured to obtain switched routing information and next hop node information, where the switched routing information is configured by a source cell, a source relay node, a target cell, or a target relay node;

accordingly, the transmission module 801 may include:

and a first sending unit, configured to send an uplink data packet to a target cell or a target relay node based on the switched routing information and the next hop node information.

Optionally, the communication device is a terminal, and the information transmission apparatus further includes:

the first processing module is configured to encrypt the uplink data packet by using a first key to obtain an encrypted uplink data packet, where the first key is a key used in communication between the terminal and a target cell or a target relay node;

the second processing module is used for determining a target Data Radio Bearer (DRB);

accordingly, the transmission module 801 may include:

and a second sending unit, configured to send the encrypted uplink data packet to the target cell or the target relay node through the target DRB.

The information transmission device of the embodiment of the invention starts to send the uplink data packet to the target cell or the target relay node under the condition that the first condition is met, and/or stops sending the uplink data packet to the source cell or the source relay node under the condition that the communication equipment meets the second condition, so that the uplink data transmission can be ensured to be switched from the source cell to the target cell in time, the switching time delay of the transmission service is reduced, and the interruption of the transmission service in the switching process is avoided.

It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. 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 integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) 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.

In some embodiments of the invention, there is also provided a processor-readable storage medium having stored thereon a computer program for causing a processor to execute steps to:

When executed by the processor, the program can implement all the implementation manners in the method embodiment applied to the communication device side shown in fig. 5, and details are not described here for avoiding repetition.

The technical scheme provided by the embodiment of the application can be suitable for various systems, particularly 5G systems. For example, the applicable System may be a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (General Packet Radio Service, GPRS) System, a Long Term Evolution (Long Term Evolution, LTE) System, a LTE Frequency Division Duplex (Frequency Division Duplex, FDD) System, a LTE Time Division Duplex (TDD) System, a Long Term Evolution (Long Term Evolution Access, LTE-a) System, a Universal Mobile Telecommunications System (UMTS), a Universal Mobile telecommunications Access (WiMAX) System, a New Radio network Access (NR 5, WiMAX) System, etc. These various systems include terminal devices and network devices. The System may further include a core network portion, such as an Evolved Packet System (EPS), a 5G System (5GS), and the like.

The network device according to the embodiment of the present application may be a base station, and the base station may include a plurality of cells for providing services to a terminal. A base station may also be referred to as an access point, or a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or by other names, depending on the particular application. The network device may be configured to exchange received air frames with Internet Protocol (IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) or a Code Division Multiple Access (CDMA), may be a network device (NodeB) in a Wideband Code Division Multiple Access (WCDMA), may be a evolved Node B (eNB or e-NodeB) in a Long Term Evolution (Long Term Evolution, LTE) System, may be a 5G Base Station (gbb) in a 5G network architecture (next generation System), may be a Home evolved Node B (Home B, HeNB), a relay Node (relay Node), a Home Base Station (femto), a pico Base Station (pico Base Station), and the like, and is not limited in the embodiments of the present application. In some network architectures, network devices may include Centralized Unit (CU) nodes and Distributed Unit (DU) nodes, which may also be geographically separated.

The terminal device referred to in the embodiments of the present application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or another processing device connected to a wireless modem. In different systems, the names of the terminal devices may be different, for example, in a 5G system, the terminal device may be called a User Equipment (UE). A wireless terminal device, which may be a mobile terminal device such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal device, for example, a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, may communicate with one or more Core Networks (CNs) via a Radio Access Network (RAN). Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an access point (access point), a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in this embodiment of the present application.

Multiple Input Multiple Output (MIMO) transmission may be performed between the network device and the terminal device by using one or more antennas, where the MIMO transmission may be Single User MIMO (SU-MIMO) or Multi-User MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of root antenna combinations.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. An information transmission method is applied to communication equipment, and is characterized in that the communication equipment is a relay node or a terminal, and the method comprises the following steps:

2. The method of claim 1,

the first condition or the second condition includes at least one of:

3. The method of claim 2, wherein the communication device is a relay node;

the first condition or the second condition further comprises at least one of:

4. The method of claim 1, wherein the communication device is a relay node;

5. The method of claim 1, wherein the communication device is a terminal;

determining a target Data Radio Bearer (DRB);

6. The method according to claim 1, wherein the relay node is an integrated access backhaul IAB node or a relay terminal.

7. The method according to claim 2, characterized in that the connection setup complete message and/or the RRC reconfiguration complete message is triggered by the RRC layer; the RRC reconfiguration message is received by the RRC layer;

8. The method according to claim 2, characterized in that the first uplink grant and/or the first downlink schedule is received by a medium access control, MAC, layer;

9. The method according to claim 3, characterized in that the F1 setup request message and/or the F1 reconfiguration complete message is triggered by the F1 entity; the F1 setup complete message and/or F1 reconfiguration message is received by the F1 entity;

10. A communication device, comprising: it is characterized by comprising: memory, transceiver, processor: a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

11. The communication device of claim 10,

the first condition or the second condition includes at least one of:

12. The communication device of claim 11,

the communication device is a relay node;

the first condition or the second condition further comprises at least one of:

13. The communication device of claim 10, wherein the communication device is a relay node;

the processor is further configured to:

14. The communication device of claim 10, wherein the communication device is a terminal;

the processor is further configured to:

determining a target Data Radio Bearer (DRB);

15. The communications device of claim 10, wherein the relay node is an integrated access backhaul IAB node or a relay terminal.

16. The communication device according to claim 11, wherein the connection setup complete message and/or the RRC reconfiguration complete message is triggered by the RRC layer; the RRC reconfiguration message is received by the RRC layer;

17. The communications device of claim 11, wherein the first uplink grant and/or the first downlink schedule is received by a medium access control, MAC, layer;

18. The communication device according to claim 12, wherein the F1 setup request message and/or the F1 reconfiguration complete message is triggered by the F1 entity; the F1 setup complete message and/or F1 reconfiguration message is received by the F1 entity;

19. An information transmission apparatus, comprising:

the transmission module is used for starting to send an uplink data packet to a target cell or a target relay node under the condition that a first condition is met; and/or stopping sending the uplink data packet to the source cell or the source relay node when the second condition is met.

20. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing a processor to execute the steps of the information transmission method according to any one of claims 1 to 9.