CN111919462A

CN111919462A - Method and device for ensuring data transmission reliability and network equipment

Info

Publication number: CN111919462A
Application number: CN201880091233.3A
Authority: CN
Inventors: 唐海
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-08-03
Filing date: 2018-08-03
Publication date: 2020-11-10
Also published as: TW202008842A; WO2020024301A1

Abstract

The embodiment of the application provides a method, a device and network equipment for ensuring the reliability of data transmission, which comprises the following steps: in the process that a main node in a dual-connection network is switched to a first main node from a second main node, the first main node maintains a second auxiliary node as an auxiliary node unchanged, wherein the first main node is a target main node in the dual-connection network, the second main node is an original main node in the dual-connection network, and the second auxiliary node is an original auxiliary node in the dual-connection network.

Description

Method and device for ensuring data transmission reliability and network equipment

Technical Field

The embodiment of the application relates to the technical field of mobile communication, in particular to a method and a device for ensuring data transmission reliability and network equipment.

Background

Low Latency and high reliability Communication (URLLC) is an important future Communication method. In order to improve the reliability of data transmission, the communication between the terminal and the network may be in the form of dual link or multi-link, which can ensure the successful transmission of data on at least one link.

In the DC network, when a terminal (UE) migrates, if two transmission links are switched simultaneously, or if the switching of one link is not completed and the switching of the other link occurs, a phenomenon that data is completely interrupted in a short time may be caused.

Disclosure of Invention

The embodiment of the application provides a method and a device for ensuring data transmission reliability and network equipment.

The method for ensuring the reliability of data transmission provided by the embodiment of the application comprises the following steps:

in the process that a main node in a dual-connection network is switched to a first main node from a second main node, the first main node maintains a second auxiliary node as an auxiliary node unchanged, wherein the first main node is a target main node in the dual-connection network, the second main node is an original main node in the dual-connection network, and the second auxiliary node is an original auxiliary node in the dual-connection network.

if the master node determines that the first session and/or the data stream in the first session need to be transmitted without interruption, the master node performs any of the following operations:

maintaining the connection state of the main node and the auxiliary node unchanged;

maintaining the connection state of the main node unchanged, and updating or changing the auxiliary node;

switching the main node, wherein the auxiliary node is kept unchanged in the process of switching the main node;

the master node is a master node in a dual-connection network, and the auxiliary node is an auxiliary node in the dual-connection network.

The device for guaranteeing data transmission reliability provided by the embodiment of the application is applied to a first main node, and comprises:

and the processing unit is used for maintaining a second auxiliary node as an auxiliary node unchanged in the process of switching the main node in the dual-connection network from a second main node to a first main node, wherein the first main node is a target main node in the dual-connection network, the second main node is an original main node in the dual-connection network, and the second auxiliary node is an original auxiliary node in the dual-connection network.

The device for guaranteeing data transmission reliability provided by the embodiment of the application is applied to a main node, and comprises:

the determining unit is used for determining that the first session and/or the data stream in the first session need to be transmitted without interruption;

a processing unit configured to perform any one of the following operations:

The network equipment provided by the embodiment of the application comprises a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory and executing the method for guaranteeing the reliability of the data transmission.

The chip provided by the embodiment of the application is used for realizing the method for ensuring the data transmission reliability.

Specifically, the chip includes: and the processor is used for calling and running the computer program from the memory so that the equipment provided with the chip executes the method for ensuring the reliability of data transmission.

A computer-readable storage medium provided in an embodiment of the present application is used for storing a computer program, where the computer program enables a computer to execute the above method for guaranteeing reliability of data transmission.

The computer program product provided by the embodiment of the present application includes computer program instructions, and the computer program instructions enable a computer to execute the method for guaranteeing reliability of data transmission.

The computer program provided in the embodiments of the present application, when running on a computer, causes the computer to execute the above method for ensuring reliability of data transmission.

According to the technical scheme, after the first main node receives the first switching request message sent by the second main node, the first main node maintains the second auxiliary node as the auxiliary node unchanged, so that the second auxiliary node can normally carry out data transmission, seamless switching under a DC network is realized, data transmission interruption is avoided, and reliable transmission under a mobile scene is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic diagram of a communication system architecture provided by an embodiment of the present application;

FIG. 2 is a diagram of a DC network architecture provided by an embodiment of the present application;

fig. 3 is a first flowchart of MN handover provided in an embodiment of the present application;

FIG. 4 is a schematic diagram of horizontal and vertical derivation of key derivation provided by embodiments of the present application;

fig. 5 is a switching flowchart based on an N2 interface provided by an embodiment of the present application;

fig. 6 is a flow chart of Xn interface based handover provided in the embodiment of the present application;

fig. 7 is a schematic diagram of key derivation on the SN side according to an embodiment of the present application;

fig. 8 is a first flowchart illustrating a method for guaranteeing reliability of data transmission according to an embodiment of the present application;

fig. 9 is a second flowchart of MN handover provided in the embodiment of the present application;

fig. 10 is a flowchart illustrating a second method for ensuring reliability of data transmission according to an embodiment of the present application;

FIG. 11 is a first schematic diagram illustrating a structure of an apparatus for ensuring data transmission reliability according to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram II of an apparatus for ensuring data transmission reliability according to an embodiment of the present application;

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

FIG. 14 is a schematic structural diagram of a chip of an embodiment of the present application;

fig. 15 is a schematic block diagram of a communication system according to an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, an LTE Frequency Division Duplex (FDD) System, an LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication System, or a 5G System.

Illustratively, a communication system 100 applied in the embodiment of the present application is shown in fig. 1. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal device 120 (or referred to as a communication terminal, a terminal). Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within that coverage area. Optionally, the Network device 110 may be a Base Transceiver Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or may be a Network device in a Mobile switching center, a relay Station, an Access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a Network-side device in a 5G Network, or a Network device in a Public Land Mobile Network (PLMN) for future evolution, or the like.

The communication system 100 further comprises at least one terminal device 120 located within the coverage area of the network device 110. As used herein, "terminal equipment" includes, but is not limited to, connections via wireline, such as Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital cable, direct cable connection; and/or another data connection/network; and/or via a Wireless interface, e.g., to a cellular Network, a Wireless Local Area Network (WLAN), a digital television Network such as a DVB-H Network, a satellite Network, an AM-FM broadcast transmitter; and/or means of another terminal device arranged to receive/transmit communication signals; and/or Internet of Things (IoT) devices. A terminal device arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal", or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. Terminal Equipment may refer to an access terminal, User Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, User terminal, wireless communication device, User agent, or User Equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having Wireless communication capabilities, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved PLMN, etc.

Optionally, a Device to Device (D2D) communication may be performed between the terminal devices 120.

Alternatively, the 5G system or the 5G network may also be referred to as a New Radio (NR) system or an NR network.

Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application.

Optionally, the communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that a device having a communication function in a network/system in the embodiments of the present application may be referred to as a communication device. Taking the communication system 100 shown in fig. 1 as an example, the communication device may include a network device 110 and a terminal device 120 having a communication function, and the network device 110 and the terminal device 120 may be the specific devices described above and are not described herein again; the communication device may also include other devices in the communication system 100, such as other network entities, for example, a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

To facilitate understanding of the technical solutions of the embodiments of the present application, the following explains technologies related to the embodiments of the present application.

Referring to fig. 2, fig. 2 is a DC network architecture formed by a primary access network (M-RAN, Master RAN) node and a Secondary access network (S-RAN, Secondary RAN) node, and it can be seen that a B3 Tunnel (N3Tunnel) and an air interface are separated respectively to form two links for redundant transmission, so that the probability that data transmission of at least one path of data at a time point is successful is further increased.

In a DC scenario, when a UE migrates, if two transmission links are switched simultaneously, or if the switching of the first link is not completed and the switching of the second link occurs, a phenomenon that data is completely interrupted in a short time may be caused. Therefore, in order to avoid data interruption when the UE moves, an interruption-free handover scheme is required.

The switching in a DC network has two kinds:

1. addition/modification/deletion of SN: the data transmission of the MN cannot be influenced in the scene, so that the data transmission cannot be interrupted;

2. handover (change) of MN: this scenario is further divided into 1) MN and SN change simultaneously, and 2) MN changes SN unchanged. For 1), there will be an interruption in data transmission, and for 2) there will be no interruption in normal transmission of data on the SN all the time during the handover. So 2 must be used for handover of URLLC).

Referring to fig. 3, fig. 3 is a flowchart of MN handoff, including the following steps:

1. a source MN sends a switching request message to a target MN;

2. the target MN sends a SN addition request message to the target SM;

3. the target SN sends an SN addition request confirmation message to the target MN;

4. the target MN sends a switching request confirmation message to the source MN;

5a, the source MN sends a SN release request message to the source SN;

5b, the source SN sends an SN release request confirmation message to the source MN;

6. the source MN sends RRC connection reconfiguration information to the UE;

7. a random access process is executed between the UE and the target MN;

8. the UE sends an RRC connection reconfiguration completion message to the target MN;

9. executing a random access process between the UE and the target SN;

10. the target MN sends a SN reconfiguration completion message to the target SN;

11. a source MN sends a state transition message to a target MN;

12. the UPF forwards data to a source MN, and the source MN forwards data to a target MN;

13. the target MN sends a PDU session path change request message to the AMF;

14. carrying out bearing modification between the UPF and the AMF;

15a, UPF allocates new path (shunt/MCG load bearing) to target MN;

15b, UPF distributes new path (shunt/SCG load bearing) to the target MN;

16. the AMF sends a PDU session path selection request confirmation message to a target MN;

17. the target MN sends a UE context release message to the source MN;

18. the source MN sends a UE context release message to the target SN.

For the above-mentioned MN handoff (change) process, fig. 4 shows the horizontal and vertical derivation of key derivation, and when the base station has unused { NCC, NH } information, the unused information is used to derive a new key KgNB during handoff, and if not, the new key KgNB is derived from the currently used KgNB, i.e. horizontal derivation. Further, switching based on the N2 interface may be as shown in fig. 5, and switching based on the Xn interface may be as shown in fig. 6.

Referring to fig. 7, for the SN-side key, the derivation method is as follows: derived by the key KgNB of the MN and the SCG Counter sent each time by the MN. When a new KgNB is updated at the MN, the S-KgNB of the corresponding SN also needs to be updated.

Fig. 8 is a first flowchart of a method for guaranteeing reliability of data transmission according to an embodiment of the present application, where as shown in fig. 8, the method for guaranteeing reliability of data transmission includes the following steps:

step 801: in the process that a main node in a dual-connection network is switched to a first main node from a second main node, the first main node maintains a second auxiliary node as an auxiliary node unchanged, wherein the first main node is a target main node in the dual-connection network, the second main node is an original main node in the dual-connection network, and the second auxiliary node is an original auxiliary node in the dual-connection network.

Here, the first primary node may be referred to as a target MN, the second primary node may be referred to as a source MN, the first secondary node may be referred to as a target SN, and the second secondary node may be referred to as a source SN. The source DC network includes a source SN and a source MN.

In the embodiment of the application, the DC network is triggered to be switched under the condition that the terminal is migrated. Specifically, the second master node sends a first handover request message to the first master node, and after the first master node receives the first handover request message sent by the second master node, the first master node maintains the second slave node as the slave node unchanged, where the second slave node supports uplink data transmission and/or downlink data transmission. It can be seen that, under the DC condition, after the source MN sends a handover request to the target MN, the target MN retains the connection of the original SN, and the original SN is in a normal data transmission state.

In this embodiment of the present application, the first handover request message includes first indication information, where the first indication information is used for the first master node to determine to maintain the second secondary node as the secondary node. Specifically, a handover request message sent by the source MN to the target MN includes first indication information, and the target MN determines that the original SN connection needs to be reserved according to the first indication information.

In an embodiment, after the master node in the dual connectivity network is switched from the second master node to the first master node, the first master node supports uplink data transmission and/or downlink data transmission (that is, a target MN ensures that both uplink and downlink data are normally transmitted), and the first master node sends a first message to the second secondary node or releases the second secondary node, where the first message is at least used to notify the master node of the occurrence of the switching. Here, the target MN initiates a request for updating the S-KgNB to the current SN or releases the current SN under the condition that it is ensured that both the uplink data and the downlink data are normally transmitted, so that interruption of data transmission can be avoided by the MN.

Further, after receiving a first acknowledgement message sent by a core network, the first master node sends the first message to the second secondary node or releases the second secondary node, where the first acknowledgement message is an acknowledgement message for a Path change Request message, such as a Path Switch Request Ack.

In the foregoing solution, after the master node in the dual connectivity network is switched from the second master node to the first master node, the first master node updates the security information to the second secondary node. For example: and the first main node generates a new S-KgNB and sends the new S-KgNB to the second auxiliary node for use.

In this embodiment of the present application, after the master node in the dual connectivity network is switched from the second master node to the first master node, the first master node initiates an establishment procedure of a first secondary node. Specifically, the target MN initiates establishment of a new SN under the condition that normal transmission of both uplink and downlink data is ensured, thereby completing update of the SN.

In the foregoing technical solution of the embodiment of the present application, the security information refers to key information, the key information corresponding to the master node is M-KgNB, and the key information used by the secondary node is S-KgNB.

According to the technical scheme of the embodiment of the application, when switching is carried out in a DC scene, the situation that data interruption does not occur at the same moment is avoided.

In the technical solution of the embodiment of the present application, the types of the MN and the SN may be the same or different, for example: one of the MN and the SN is an NR base station (gNB), and the other is an LTE base station (eNB). For another example: both MN and SN are NR base stations (gbbs). Another example is: both MN and SN are LTE base stations (enbs).

The corresponding key for the S-gNB is denoted as S-KgNB, the corresponding key for the M-gNB is denoted as M-KgNB, the corresponding key for the S-eNB is denoted as S-KeNB, and the corresponding key for the S-eNB is denoted as S-KeNB.

Referring to fig. 9, a method for guaranteeing reliability of data transmission according to an embodiment of the present application is described below by way of example, and referring to fig. 9, a handover procedure of a DC network is to release an original SN while handing over a new MN. And the key update and/or SN change for the SN all occur after the MN handover is completed, the specific flow includes the following steps:

1. a source MN sends a switching request message to a target MN;

2. the target MN sends a SgNB addition request message to the target SM;

3. the target SN sends a SgNB addition request confirmation message to the target MN;

5a, the source MN sends a SgNB release request message to the source SN;

5b, the source SN sends a SgNB release request confirmation message to the source MN;

6. the source MN sends RRC connection reconfiguration information to the UE;

7. a random access process is executed between the UE and the target MN;

9. executing a random access process between the UE and the target SN;

10. the target MN sends a SgNB reconfiguration completion message to the target SN;

11a, the source SN reports the data volume of the auxiliary RAT side to the source MN;

11b, the source MN reports the information of the auxiliary RAT side to the MME;

12. a source MN sends an SN state transfer message to a target MN;

13. the S-GW forwards data to a source MN, and the source MN forwards data to a target MN;

14. the target MN sends a PDU session path change request message to the MME;

15. carrying out bearing modification between the MME and the S-GW;

16a, allocating a new path (shunt/MCG load) to the target MN by the S-GW;

16b, S-GW distributing new path (shunt/SCG load bearing) to target MN;

17. MME sends PDU conversation path selection request confirmation message to target MN;

18. the target MN sends a UE context release message to the source MN;

19. the source MN sends a UE context release message to the target SN.

Based on the above flow shown in fig. 9, the embodiment of the present application may be modified as follows:

1. the first identifier may be added to the handover request message to indicate that the handover is for URLLC use, that is, no interruption in the data handover process needs to be ensured.

2. Due to the need to ensure that the data is uninterrupted, the target MN does not make a new SN addition, but rather uses the existing SN, i.e., the source SN.

3. In the process of switching the UE to a new MN (i.e. a target MN), the data transmission of the source SN is always performed normally.

4. After the target MN completes the switching, after the uplink and downlink data transmission is normally carried out, the replacement of the S-KgNB of the SN and/or the change of the SN is triggered.

Fig. 10 is a flowchart illustrating a second flowchart of a method for guaranteeing reliability of data transmission according to an embodiment of the present application, where as shown in fig. 10, the method for guaranteeing reliability of data transmission includes the following steps:

step 1001: if the master node determines that the first session and/or the data stream in the first session need to be transmitted without interruption, the master node performs any of the following operations: maintaining the connection state of the main node and the auxiliary node unchanged; maintaining the connection state of the main node unchanged, and updating or changing the auxiliary node; switching the main node, wherein the auxiliary node is kept unchanged in the process of switching the main node; the master node is a master node in a dual-connection network, and the auxiliary node is an auxiliary node in the dual-connection network.

In this embodiment of the present application, the updating or changing the secondary node includes:

replacing the auxiliary node; alternatively, the first and second electrodes may be,

updating the UE context on the secondary node.

In this embodiment of the present application, the master node determines that the first session and/or the data stream in the first session need to be transmitted without interruption, and may be implemented in the following two ways:

the first method is as follows: the master node determines that the first session and/or the data stream in the first session need to be transmitted without interruption based on second indication information, where the second indication information is used to indicate that the first session and/or the data stream in the first session need to be transmitted without interruption, and the second indication information is sent to the master node by a core network element when the data stream in the first session and/or the first session is established or updated.

Further, if the second indication information is set with a data flow as a granularity, the second indication information is included in the QoS profile.

The second method comprises the following steps: the master node determines that the first session and/or the data flow in the first session need not perform an uninterrupted transmission based on the QoS parameter (e.g., 5QI) of the first session and/or the data flow in the first session.

In this embodiment of the present application, under the condition that the master node determines that the first session and/or the data stream in the first session need to be executed without interruption, the master node may further execute a master node switching, where the slave node is maintained unchanged in the master node switching process, that is, the seamless switching across the MN is performed, and the seamless switching across the MN may refer to the method steps shown in fig. 8.

Fig. 11 is a schematic structural composition diagram of an apparatus for ensuring data transmission reliability according to an embodiment of the present application, which is applied to a first host node, and as shown in fig. 11, the apparatus includes:

the processing unit 1102 is configured to maintain a second secondary node as a secondary node unchanged in a process that a master node in a dual connectivity network is switched from a second master node to a first master node, where the first master node is a target master node in the dual connectivity network, the second master node is an original master node in the dual connectivity network, and the second secondary node is an original secondary node in the dual connectivity network.

In an embodiment, the first handover request message includes first indication information used by the first primary node to determine to maintain the second secondary node as a secondary node.

In one embodiment, the apparatus further comprises:

a receiving unit 1101, configured to receive a first handover request message sent by the second master node;

the processing unit 1102 maintains the second auxiliary node as an auxiliary node, and the second auxiliary node supports uplink data transmission and/or downlink data transmission.

In one embodiment, the apparatus further comprises: a transmitting unit 1103;

after the master node in the dual connectivity network is switched from the second master node to the first master node, the first master node supports uplink data transmission and/or downlink data transmission, the sending unit 1103 sends a first message to the second secondary node or the processing unit 1102 releases the second secondary node, where the first message is at least used to notify the master node that the switching occurs.

In one embodiment, the apparatus further comprises: a transmitting unit 1103;

after the receiving unit 1101 receives a first acknowledgement message sent by a core network, the sending unit 1103 sends the first message to the second secondary node or the processing unit 1102 releases the second secondary node, where the first acknowledgement message is an acknowledgement message for a path change request message.

In an embodiment, after the master node in the dual connectivity network is switched from the second master node to the first master node, the processing unit 1102 initiates an establishment procedure of a first secondary node.

In an embodiment, after the master node in the dual connectivity network is switched from the second master node to the first master node, the processing unit 1102 is further configured to update the security information to the second secondary node.

It should be understood by those skilled in the art that the above description of the apparatus for guaranteeing reliability of data transmission according to the embodiments of the present application can be understood by referring to the description of the method for guaranteeing reliability of data transmission according to the embodiments of the present application.

Fig. 12 is a schematic structural composition diagram of an apparatus for ensuring data transmission reliability according to an embodiment of the present application, which is applied to a master node, and as shown in fig. 12, the apparatus includes:

a determining unit 1201, configured to determine that the first session and/or the data stream in the first session need to perform uninterrupted transmission;

a processing unit 1202 configured to perform any one of the following operations:

In an embodiment, the processing unit 1202 is configured to replace the secondary node; or updating the UE context on the secondary node.

In an embodiment, the determining unit 1201 is configured to determine, based on second indication information, that the first session and/or the data stream in the first session need to perform transmission without interruption, where the second indication information is used to indicate that the first session and/or the data stream in the first session need to perform transmission without interruption, and the second indication information is sent to the master node by a core network element when the first session and/or the data stream in the first session are established or updated.

In an embodiment, if the second indication information is set with a granularity of data flow, the second indication information is included in QoS profile.

In an embodiment, the determining unit 1201 is configured to determine, based on the QoS parameter of the first session and/or the data flow in the first session, that the first session and/or the data flow in the first session need not perform uninterrupted transmission.

Fig. 13 is a schematic structural diagram of a communication device 600 according to an embodiment of the present application. The communication device may be a network device, and the communication device 600 shown in fig. 13 includes a processor 610, and the processor 610 may call and execute a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 13, the communication device 600 may further include a memory 620. From the memory 620, the processor 610 may call and run a computer program to implement the method in the embodiment of the present application.

The memory 620 may be a separate device from the processor 610, or may be integrated into the processor 610.

Optionally, as shown in fig. 13, the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices, and specifically, may transmit information or data to the other devices or receive information or data transmitted by the other devices.

The transceiver 630 may include a transmitter and a receiver, among others. The transceiver 630 may further include one or more antennas.

Optionally, the communication device 600 may specifically be a network device in the embodiment of the present application, and the communication device 600 may implement a corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the communication device 600 may specifically be a mobile terminal/terminal device according to this embodiment, and the communication device 600 may implement a corresponding process implemented by the mobile terminal/terminal device in each method according to this embodiment, which is not described herein again for brevity.

Fig. 14 is a schematic structural diagram of a chip of an embodiment of the present application. The chip 700 shown in fig. 14 includes a processor 710, and the processor 710 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 14, the chip 700 may further include a memory 720. From the memory 720, the processor 710 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 720 may be a separate device from the processor 710, or may be integrated into the processor 710.

Optionally, the chip 700 may further include an input interface 730. The processor 710 may control the input interface 730 to communicate with other devices or chips, and in particular, may obtain information or data transmitted by other devices or chips.

Optionally, the chip 700 may further include an output interface 740. The processor 710 may control the output interface 740 to communicate with other devices or chips, and in particular, may output information or data to the other devices or chips.

Optionally, the chip may be applied to the network device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the chip may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, and for brevity, no further description is given here.

It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip or a system-on-chip, etc.

Fig. 15 is a schematic block diagram of a communication system 900 according to an embodiment of the present application. As shown in fig. 15, the communication system 900 includes a terminal device 910 and a network device 920.

The terminal device 910 may be configured to implement the corresponding function implemented by the terminal device in the foregoing method, and the network device 920 may be configured to implement the corresponding function implemented by the network device in the foregoing method, for brevity, which is not described herein again.

It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic random access memory (Dynamic RAM, DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), synchlronous DRAM (SLDRAM), and Direct memory bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the above memories are exemplary but not limiting illustrations, for example, the memories in the embodiments of the present application may also be Static Random Access Memory (SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (enhanced SDRAM, ESDRAM), Synchronous Link DRAM (SLDRAM), Direct Rambus RAM (DR RAM), and the like. That is, the memory in the embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

The embodiment of the application also provides a computer readable storage medium for storing the computer program.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the computer-readable storage medium may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Embodiments of the present application also provide a computer program product comprising computer program instructions.

Optionally, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions enable the computer to execute corresponding processes implemented by the network device in the methods in the embodiment of the present application, which are not described herein again for brevity.

Optionally, the computer program product may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the mobile terminal/terminal device in the methods in the embodiment of the present application, which are not described herein again for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to the network device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the computer program may be applied to the mobile terminal/terminal device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

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 functional division, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. 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

A method of ensuring reliability of data transmission, the method comprising:

in the process that a main node in a dual-connection network is switched to a first main node from a second main node, the first main node maintains a second auxiliary node as an auxiliary node unchanged, wherein the first main node is a target main node in the dual-connection network, the second main node is an original main node in the dual-connection network, and the second auxiliary node is an original auxiliary node in the dual-connection network.
The method of claim 1, wherein the first handover request message includes first indication information for the first primary node to determine to maintain the second secondary node as a secondary node unchanged.
The method according to claim 1 or 2, wherein after the first master node receives the first handover request message sent by the second master node, the first master node maintains the second slave node as the slave node, and the second slave node supports uplink data transmission and/or downlink data transmission.
The method according to any one of claims 1 to 3, wherein after the master node in the dual connectivity network is switched from the second master node to the first master node, the first master node supports uplink data transmission and/or downlink data transmission, and the first master node sends a first message to the second secondary node or releases the second secondary node, wherein the first message is at least used for notifying the master node that the switching occurs.
The method according to claim 4, wherein the first master node sends the first message to the second secondary node or releases the second secondary node after receiving a first acknowledgement message sent by a core network, wherein the first acknowledgement message is an acknowledgement message for a path change request message.
The method of claim 4 or 5, wherein the method further comprises:

and after the master node in the dual-connection network is switched from the second master node to the first master node, the first master node initiates the establishment process of the first auxiliary node.
The method of any of claims 1 to 6, wherein the method further comprises:

and after the main node in the dual-connection network is switched from the second main node to the first main node, the first main node updates safety information to the second auxiliary node.
A method of ensuring reliability of data transmission, the method comprising:

if the master node determines that the first session and/or the data stream in the first session need to be transmitted without interruption, the master node performs any of the following operations:

maintaining the connection state of the main node and the auxiliary node unchanged;

maintaining the connection state of the main node unchanged, and updating or changing the auxiliary node;

switching the main node, wherein the auxiliary node is kept unchanged in the process of switching the main node;

the master node is a master node in a dual-connection network, and the auxiliary node is an auxiliary node in the dual-connection network.
The method of claim 8, wherein the updating or changing of the secondary node comprises:

replacing the auxiliary node; alternatively, the first and second electrodes may be,

updating the UE context on the secondary node.
The method of claim 8 or 9, wherein the master node determining that the first session and/or the data stream in the first session need to perform an interruption-free transmission comprises:

the master node determines that the first session and/or the data stream in the first session need to be transmitted without interruption based on second indication information, where the second indication information is used to indicate that the first session and/or the data stream in the first session need to be transmitted without interruption, and the second indication information is sent to the master node by a core network element when the data stream in the first session and/or the first session is established or updated.
The method of claim 10, wherein the second indication information is included in QoS profile if the second indication information is set with a data flow as a granularity.
The method of claim 8 or 9, wherein the master node determining that the first session and/or the data stream in the first session need to perform an interruption-free transmission comprises:

the master node determines that the first session and/or the data flow in the first session need not perform uninterrupted transmission based on the QoS parameters of the first session and/or the data flow in the first session.
An apparatus for ensuring data transmission reliability, applied to a first host node, the apparatus comprising:

and the processing unit is used for maintaining a second auxiliary node as an auxiliary node unchanged in the process of switching the main node in the dual-connection network from a second main node to a first main node, wherein the first main node is a target main node in the dual-connection network, the second main node is an original main node in the dual-connection network, and the second auxiliary node is an original auxiliary node in the dual-connection network.
The apparatus of claim 13, wherein the first handover request message includes first indication information for the first primary node to determine to maintain the second secondary node as a secondary node unchanged.
The apparatus of claim 13 or 14, wherein the apparatus further comprises:

a receiving unit, configured to receive a first switching request message sent by the second master node;

and the processing unit maintains the second auxiliary node as an auxiliary node unchanged, and the second auxiliary node supports uplink data transmission and/or downlink data transmission.
The apparatus of any of claims 13 to 15, wherein the apparatus further comprises: a transmitting unit;

after the master node in the dual connectivity network is switched from the second master node to the first master node, the first master node supports uplink data transmission and/or downlink data transmission, and the sending unit sends a first message to the second secondary node or the processing unit releases the second secondary node, where the first message is at least used to notify the master node that the switching occurs.
The apparatus according to claim 16, wherein after the receiving unit receives a first acknowledgement message sent by a core network, the sending unit sends the first message to the second secondary node or the processing unit releases the second secondary node, where the first acknowledgement message is an acknowledgement message for a path change request message.
The apparatus of claim 16 or 17, wherein the processing unit initiates a setup procedure for a first secondary node after a master node in the dual connectivity network switches from the second master node to the first master node.
The apparatus of any of claims 13 to 18, wherein the processing unit, after the master node in the dual connectivity network switches from the second master node to the first master node, is further configured to update the security information to a second secondary node.
An apparatus for ensuring data transmission reliability, applied to a master node, the apparatus comprising:

the determining unit is used for determining that the first session and/or the data stream in the first session need to be transmitted without interruption;

a processing unit configured to perform any one of the following operations:

maintaining the connection state of the main node and the auxiliary node unchanged;

maintaining the connection state of the main node unchanged, and updating or changing the auxiliary node;

switching the main node, wherein the auxiliary node is kept unchanged in the process of switching the main node;

the master node is a master node in a dual-connection network, and the auxiliary node is an auxiliary node in the dual-connection network.
The apparatus of claim 20, wherein the processing unit is configured to replace the secondary node; or updating the UE context on the secondary node.
The apparatus of claim 20 or 21, wherein the determining unit is configured to determine that the first session and/or the data stream in the first session need to perform transmission without interruption based on second indication information, where the second indication information is used to indicate that the first session and/or the data stream in the first session need to perform transmission without interruption, and the second indication information is sent to the master node by a core network element when the first session and/or the data stream in the first session is established or updated.
The apparatus of claim 22, wherein the second indication information is included in QoS profile if the second indication information is set at data flow granularity.
The apparatus according to claim 20 or 21, wherein the determining unit is configured to determine that the first session and/or the data flow in the first session does not need to perform the transmission without interruption based on the QoS parameter of the first session and/or the data flow in the first session.
A network device, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory, to perform the method of any of claims 1 to 7, or to perform the method of any of claims 8 to 12.
A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs the method of any of claims 1 to 7, or the method of any of claims 8 to 12.
A computer readable storage medium storing a computer program for causing a computer to perform the method of any one of claims 1 to 7, or the method of any one of claims 8 to 12.
A computer program product comprising computer program instructions to cause a computer to perform the method of any of claims 1 to 7, or the method of any of claims 8 to 12.
A computer program for causing a computer to perform the method of any one of claims 1 to 7, or the method of any one of claims 8 to 12.