WO2020143054A1

WO2020143054A1 - Rrc connection re-establishment method and apparatus, and network device

Info

Publication number: WO2020143054A1
Application number: PCT/CN2019/071473
Authority: WO
Inventors: 王淑坤
Original assignee: Oppo广东移动通信有限公司
Priority date: 2019-01-11
Filing date: 2019-01-11
Publication date: 2020-07-16
Also published as: CN112703770A; CN112703770B

Abstract

The embodiments of the present application provide an RRC connection re-establishment method and apparatus, and network device, comprising: a target base station receives an RRC connection re-establishment request message sent by a terminal, said RRC connection re-establishment request message carrying first information, said first information being used for addressing a secondary node, said secondary node and a primary node forming a dual connection network, the secondary node storing first UE context of said terminal and the primary node storing second UE context of the terminal; the RAT to which a target base station belongs is the same as the RAT to which the secondary node belongs; said target base station obtains the first UE context of the secondary node side and the second UE context of the primary node side, and sends an RRC connection re-establishment message to the terminal; the target base station receives an RRC connection re-establishment complete message sent by the terminal, and initiates a path switching process to a first core network element.

Description

RRC connection reconstruction method and device, and network equipment

Technical field

Embodiments of the present application relate to the technical field of mobile communications, and in particular, to a method, device, and network device for radio resource control (Radio Resource Control, RRC) connection reestablishment.

Background technique

If an RRC connection fails, the user equipment (User Equipment, UE) searches for a suitable cell and selects the appropriate cell to initiate the RRC connection reestablishment process. However, the UE will only initiate an RRC connection reestablishment request to a cell of the same radio access type (Radio Access Technology, RAT) as the serving cell before the RRC connection failure. If the target cell found after the RRC connection fails, the RRC connection fails The RAT of the previous serving cell is different, which will cause the RRC connection cannot be restored.

Summary of the invention

Embodiments of the present application provide an RRC connection reestablishment method and apparatus, and network equipment.

The RRC connection reestablishment method provided by the embodiment of the present application includes:

The target base station receives an RRC connection reestablishment request message sent by the terminal. The RRC connection reestablishment request message carries first information, and the first information is used to address a secondary node. The secondary node and the primary node form a dual connection network. The secondary node stores the first UE context of the terminal, and the primary node stores the second UE context of the terminal; wherein, the RAT to which the target base station belongs is the same as the RAT to which the secondary node belongs;

The target base station acquires the first UE context on the secondary node side and the second UE context on the master node side, and sends an RRC connection reestablishment message to the terminal;

The target base station receives the RRC connection reestablishment complete message sent by the terminal, and initiates a path switching process to the first core network element.

The target base station receives an RRC connection reestablishment request message sent by the terminal, where the RRC connection reestablishment request message carries first information, and the first information is used to address the original base station, where the original base station stores the UE context of the terminal; where , The RAT to which the target base station belongs is different from the RAT to which the original base station belongs;

The target base station acquires the UE context on the original base station side, and sends an RRC connection reestablishment message to the terminal;

The RRC connection reestablishment device provided in the embodiment of the present application is applied to the target base station, and the device includes:

A first receiving unit, configured to receive an RRC connection reestablishment request message sent by a terminal, the RRC connection reestablishment request message carrying first information, the first information is used to address a secondary node, and the secondary node and the primary node form a double Connect to the network, the secondary node stores the first UE context of the terminal, and the primary node stores the second UE context of the terminal; wherein, the RAT to which the target base station belongs and the RAT to which the secondary node belongs the same;

An obtaining unit, configured to obtain the first UE context on the secondary node side and the second UE context on the master node side, and send an RRC connection reestablishment message to the terminal;

The second receiving unit is configured to receive the RRC connection reestablishment complete message sent by the terminal, and initiate a path switching process to the first core network element.

A first receiving unit, configured to receive an RRC connection reestablishment request message sent by a terminal, the RRC connection reestablishment request message carrying first information, the first information is used to address an original base station, and the original base station stores the terminal UE context; wherein, the RAT to which the target base station belongs is different from the RAT to which the original base station belongs;

An obtaining unit, configured to obtain the UE context on the original base station side, and send an RRC connection reestablishment message to the terminal;

The network device provided by the embodiment of the present application includes a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the above-mentioned RRC connection reestablishment method.

The chip provided in the embodiment of the present application is used to implement the foregoing RRC connection reestablishment method.

Specifically, the chip includes a processor for calling and running a computer program from the memory, so that the device installed with the chip executes the above-mentioned RRC connection reestablishment method.

The computer-readable storage medium provided by the embodiment of the present application is used to store a computer program, and the computer program enables the computer to execute the above-mentioned RRC connection reestablishment method.

The computer program product provided by the embodiment of the present application includes computer program instructions, and the computer program instructions cause the computer to execute the foregoing RRC connection reestablishment method.

The computer program provided by the embodiment of the present application causes the computer to execute the above-mentioned RRC connection reestablishment method when it runs on the computer.

Through the above technical solution, for the dual connection scenario, the target cell for RRC connection reestablishment is the same as the SN RAT. The UE identification information in the RRC connection reestablishment request message is relevant information configured on the SN side. When acquiring the complete context of the UE, It can be obtained indirectly through the SN, or the SN forwards the UE-related identification information and the MN-related identification information, and the UE directly obtains the UE context information at the MN. For the independent networking scenario, the target cell for RRC connection reestablishment is different from the serving cell before the RRC connection failure. The RRC connection recovery request message carries the RAT information before the RRC connection failure, or implicitly indicates the RRC connection failure according to the PCI length. The previous RAT information facilitates the target cell for RRC connection reestablishment to address the original cell. The technical solutions of the embodiments of the present application are used to allow the UE to reestablish to other RAT cells, so as to quickly restore the RRC connection.

BRIEF DESCRIPTION

The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an undue limitation on the present application. In the drawings:

FIG. 1 is a schematic diagram of a communication system architecture provided by an embodiment of this application;

FIG. 2 is an overall EN-DC networking architecture provided by an embodiment of this application;

3 is a schematic diagram of scheme 3A and scheme 3 of EN-DC provided by an embodiment of the present application;

FIG. 4 is a control plane architecture diagram provided by an embodiment of this application;

5 is a schematic diagram of a user plane bearing type provided by an embodiment of the present application;

6 is a diagram of an SN side key derivation architecture provided by an embodiment of this application;

7 is a diagram of an EN-DC measurement architecture provided by an embodiment of this application;

8 is a schematic diagram of an MR-DC mode provided by an embodiment of this application;

9 is a flowchart of a successful RRC connection reestablishment provided by an embodiment of this application;

10 is a flowchart of RRC connection establishment failed according to an embodiment of the present application, and transfers to RRC connection establishment;

11 is a first schematic flowchart of an RRC connection reestablishment method provided by an embodiment of the present application;

12 is a schematic diagram of a scenario of an application example 1 provided by an embodiment of the present application;

13 is a schematic diagram of a scenario of an application example 2 provided by an embodiment of this application;

14 is a second schematic flowchart of an RRC connection reestablishment method provided by an embodiment of the present application;

15 is a schematic diagram of a scenario of Application Example 3 provided by an embodiment of the present application;

16 is a schematic diagram of a scenario of Application Example 4 provided by an embodiment of the present application;

17 is a schematic structural composition diagram of an RRC connection reestablishment device provided by an embodiment of the present application;

18 is a schematic structural diagram of a communication device 600 according to an embodiment of the present application;

19 is a schematic structural diagram of a chip according to an embodiment of this application;

FIG. 20 is a schematic block diagram of a communication system 900 provided by an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: Global Mobile System (Global System of Mobile Communication (GSM) system, Code Division Multiple Access (CDMA) system, Broadband Code Division Multiple Access) (Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (General Packet Radio Service, GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time division duplex (Time Division Duplex, TDD), universal mobile communication system (Universal Mobile Telecommunication System, UMTS), global interconnection microwave access (Worldwide Interoperability for Microwave Access, WiMAX) communication system or 5G system, etc.

Exemplarily, the 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 120 (or referred to as a communication terminal, terminal). The network device 110 can provide communication coverage for a specific geographic area, and can communicate with terminals located within the coverage area. Optionally, the network device 110 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a base station (NodeB, NB) in a WCDMA system, or an evolved base station in an LTE system (Evolutional Node B, eNB or eNodeB), or a wireless controller in the Cloud Radio Access Network (CRAN), or the network equipment can be a mobile switching center, a relay station, an access point, an in-vehicle device, Wearable devices, hubs, switches, bridges, routers, network-side devices in 5G networks or network devices in future public land mobile networks (Public Land Mobile Network, PLMN), etc.

The communication system 100 also includes at least one terminal 120 located within the coverage of the network device 110. As used herein, "terminals" include but are not limited to connections via wired lines, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Lines (DSL), digital cables, and direct cable connections; And/or another data connection/network; and/or via a wireless interface, eg for cellular networks, wireless local area networks (Wireless Local Area Network, WLAN), digital TV networks such as DVB-H networks, satellite networks, AM-FM Broadcast transmitter; and/or another terminal is set to receive/transmit communication signals; and/or Internet of Things (IoT) equipment. A terminal configured to communicate through 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 Communication Systems (PCS) terminals that can combine cellular radiotelephones with data processing, facsimile, and data communication capabilities; may include radiotelephones, pagers, Internet/internal PDA with networked access, web browser, notepad, calendar, and/or Global Positioning System (GPS) receiver; and conventional laptop and/or palm-type receivers or others including radiotelephone transceivers Electronic device. Terminal can refer to access terminal, user equipment (User Equipment, UE), user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user Device. Access terminals can be cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital processing (Personal Digital Assistant (PDA), wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminals in 5G networks, or terminals in future evolved PLMNs, etc.

Optionally, terminal 120 may perform terminal direct connection (Device to Device, D2D) communication.

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

FIG. 1 exemplarily shows one network device and two terminals. Optionally, the communication system 100 may include multiple network devices and each network device may include other numbers of terminals within the coverage area. Embodiments of the present application There is no restriction on this.

Optionally, the communication system 100 may further include other network entities such as a network controller, a mobility management entity, etc. This embodiment of the present application does not limit this.

It should be understood that the devices with communication functions in the network/system in the embodiments of the present application may be referred to as communication devices. Taking the communication system 100 shown in FIG. 1 as an example, the communication device may include a network device 110 and a terminal 120 having a communication function, and the network device 110 and the terminal 120 may be the specific devices described above, which will not be repeated here; communication The device may also include other devices in the communication system 100, such as network controllers, mobility management entities, and other network entities, which are not limited in the embodiments of the present application.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" in this article is just an association relationship that describes an associated object, which means that there can be three kinds of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, exist alone B these three cases. In addition, the character “/” in this article generally indicates that the related objects before and after it are in an “or” relationship.

As people speed, latency, high-speed mobility, energy efficiency and the future of life in the pursuit of the business of diversity, complexity, for the third Generation Partnership Project ^{(3 rd Generation Partnership Project, 3GPP} ) ISO began the development of 5G . The main application scenarios of 5G are: enhanced mobile broadband (eMBB), low-latency and highly reliable communications (Ultra-Reliable Low-Latency Communications, URLLC), and large-scale machine-type communications (mass Machine-Type Communications, mMTC ).

On the one hand, eMBB still aims at users' access to multimedia content, services and data, and its demand is growing rapidly. On the other hand, since eMBB may be deployed in different scenarios, such as indoors, urban areas, and rural areas, its capabilities and requirements are also quite different, so it cannot be generalized and must be analyzed in detail in conjunction with specific deployment scenarios. Typical applications of URLLC include: industrial automation, power automation, telemedicine operations (surgery), traffic safety assurance, etc. Typical characteristics of mMTC include: high connection density, small data volume, delay-insensitive services, low cost and long service life of modules.

In the early deployment of NR, complete NR coverage is difficult to obtain, so typical network coverage is wide area LTE coverage and NR island coverage mode. And a lot of LTE is deployed below 6GHz, and there is very little spectrum below 6GHz available for 5G. Therefore, NR must study spectrum applications above 6 GHz, while high frequency bands have limited coverage and fast signal fading. At the same time, in order to protect the early investment of mobile operators in LTE, a working mode of tight cooperation between LTE and NR was proposed.

In order to achieve 5G network deployment and commercial applications as soon as possible, 3GPP first completed the first 5G version before the end of 2017, namely EN-DC (LTE-NR Dual Connectivity). In EN-DC, LTE base station (eNB) serves as the master node (Master Node, MN), NR base station (gNB or en-gNB) serves as the secondary node (Secondary Node, SN), EN-DC network deployment and networking architecture As shown in Figure 2, where E-UTRAN stands for the access network part, EPC stands for the core network part, and the access network part is composed of at least one eNB (two eNBs are shown in Figure 2) and at least one en-gNB (Figure 2 In the figure, two en-gNB) components are shown, in which eNB serves as MN, en-gNB serves as SN, and both MN and SN are connected to EPC.

EN-DC scenarios include scenario 3A (Scenario 3A) and scenario 3 (Scenario 3) shown in FIG. 3. Among them, in Scenario 3A, LTE serves as MN, and gNB serves as SN. There is a control plane interface (S1-C) and a user plane interface (S1-U) between LTE and eNB, while there is only a user plane interface between gNB and EPC. (S1-U), gNB control plane signaling needs to be forwarded to EPC via LTE eNB. In Scenario 3, LTE serves as MN and gNB serves as SN. Between LTE and eNB, there is a control plane interface (S1-C) and a user plane interface (S1-U). Both gNB control plane signaling and user plane messages need to pass. LTE eNB forwards to EPC.

Compared with LTE DC, the main key technical points of EN-DC include: control plane, user plane, security, radio link failure (Radio Link Failure, RLF), system broadcast reception and radio resource management (Radio Resource Management, RRM) coordination and UE capability coordination, etc. Each is described below.

Control surface

On the control plane, there are RRC entities on both the MN and SN sides, and both can generate RRC protocol data units (Protocol Data Unit, PDU). However, there is only one RRC state machine at the same time and it is based on the MN side. The architecture of the control plane is shown in Figure 4. MeNB is MN, SgNB is SN, RRC entity exists on both MeNB side and SgNB side, and there is RRC entity on UE side. There is only one RRC state machine at the same time and it is based on MN side (ie MeNB state ).

The signaling bearers in LTE include SRB0, SRB, SRB2, and EN-DC on the basis of which SRB3 is further supported. SRB3 is used to transmit RRC signaling between the SN and the UE. The signaling content generated by the signaling does not require resource and UE capability negotiation with the MN. At the same time, in order to improve the reliability of SRB1 and SRB2, EN-DC supports split SRB1 and split SRB2, that is, the Packet Data Convergence Protocol (PDCP) PDU corresponding to the RRC message generated by the MN is repeatedly transmitted on the SN side. Ensure its high reliability.

User plane

In LTE DC, the user plane bearer types include primary cell group bearer (MCG bearer), secondary cell group bearer (SCG bearer), and primary cell component stream bearer (MCG split bearer). On this basis, in order to improve the reliability of data transmission, EN-DC proposes a secondary cell component stream bearer (SCG split bearer). MCG split bearer and SCG split bearer mainly lie in different functions of PDCP layer and different keys of PDCP layer.

In order to minimize the changes between MCG split bearer and SCG split bearer, reduce the work of standardization, implementation and testing, and minimize the differentiation of market product characteristics, the concept of bearer harmonization is proposed, that is, MCG split split bearer and SCG split split bearer are unified into one The bearer type, that is, split bearer, that is, which split form is transparent to the UE, as shown in FIG. 5.

Different load types can be converted into each other. In order to reduce the impact of bearer conversion, the PDCP version type for bearer configuration provides:

Table 1

Safety

In EN-DC, the key derivation process on the MN side is the same as the key derivation process of LTE Standalone (SA). The key and parameter input for the SN side is shown in Figure 6. In EN-DC, the network side configures a KeNB or S-KeNB for each bearer with a key for the bearer.

Regarding the reporting of the UE's ability to support the NR security algorithm, in order to reduce the impact on the EPC, the network side uses the LTE security capability algorithm support to determine the NR algorithm capability support, such as NR algorithm(nea0/1/2/3andnia0/1/2/3) Corresponding to LTE algorithms (eea0/1/2/3and eia0/1/2/3).

Wireless link monitoring

In EN-DC, if RLF occurs on the MCG side, the UE is triggered to initiate the RRC connection reestablishment process; if RLF occurs on the SCG side, the UE suspends all SCG side bearers and SCG side transmissions and reports SCGFailureInformation to the MN side.

During the SCG failure, the UE maintains the measurement configuration from the MN and SN sides, and continues to perform the corresponding measurement, if possible.

System broadcast information reception

NR does not need to broadcast system broadcast information, except for system frame number (System Frame Number, SFN) timing information. System information is provided to the UE through LTE eNB with dedicated signaling. The UE needs to at least acquire the SCG radio frame timing and SFN information from the NR primary and secondary cells (PSCell).

NR SCG system information (System) Information (SI) changes can be configured to the UE through dedicated signaling, or LTE MCG SRB NR SCG SRB.

When the NR, Scell, and SI change, the network side first releases and then adds the related NR, Scell, but uses the same RRC connection reconfiguration message. And this process can be completed by MCG SRB or SCG SRB.

RRM coordination

The total number of carriers to be measured for LTE and NR needs to be negotiated to avoid exceeding the capabilities of the UE. The measurement architecture of EN-DC is shown in Figure 7. The total number of measurement carriers is coordinated between MN and SN. The RRC layer on the MN side (that is, LTE RRC) implements the following configuration: measurement object, measurement identification, and report configuration; the RRC layer on the SN side ( That is, NRRRC) implements the following configurations: measurement object, measurement identifier, and report configuration; accordingly, the UE obtains the measurement configuration on the MN side and sends the measurement report to the MN after performing the measurement; the UE obtains the measurement configuration on the SN side and performs the measurement to the SN Send a measurement report.

The independent configuration information of MN and SN, the UE will not do any tampering with the parameters, the purpose is to ensure the consistency of the measurement configuration. The number of configured frequency layers will be negotiated between the MN and the SN. The MN indicates the number of frequency layers that can be used for the SN. The renegotiation initiated by the SN is not supported.

If the measurement objects configured by the MN and SN are the same carrier, the measurement object configuration information needs to be consistent. The MN maintains the measurement configuration of NR and frequency, and also maintains part of the measurement configuration of NR and non-serving frequency. The SN maintains all the measurement configuration of NR and non-serving frequency.

The NR and RRC measurements configured by the SN are always reported on the SCG and SRB if the SCG and SRB are configured. The measurement configured on the MN side needs to be reported to the MN side.

MN and SN configure independent s-Measure, MN-configured s-Measure refers to PCell signal quality, SN-configured s-Measure refers to PSCell signal quality.

UE capability coordination

In EN-DC, the use of UE capabilities needs to be negotiated between MN and SN to avoid resource configuration exceeding UE capability limits. The UE capabilities to be negotiated in EN-DC include at least: cross-RAT band combining capability (BC), L2buffer capability and UE uplink power.

The capabilities of the UE are divided into three types according to whether negotiation is required:

TYPE I: Each RATRAT is independent and does not require coordinated UE capabilities.

TYPE II: The use of this UE capability will affect another RAT, and the use of UE capabilities that do not require another RAT to understand.

TYPE III: The use of this UE capability will affect another RAT, and the use of the UE capability needs to be understood by another RAT.

In the capability coordination of LTE/NR, only the capability coordination between two nodes is considered, that is, one LTE eNB and one NR gNB. The ability to coordinate depends on how the MN node makes decisions on how to resolve dependencies. For the capabilities that need to be coordinated, the SN node allows the renegotiation of the initial capabilities. For the capability renegotiation request from the SN, the MN node makes the final decision.

MN provides SN information about SN UE capabilities and EN-DC capabilities.

Capability coordination interacts via the X2 interface. Some capability coordination will trigger RRC connection reconfiguration, such as RF capabilities, and some capability coordination does not require RRC connection reconfiguration, such as buffer size.

In the late R15, other DC modes will be supported, namely NE-DC, 5GC-EN-DC, NR DC. For EN-DC, the core network connected by the access network is a 4G core network (EPC), and the core network connected by other DC modes is a 5G core network (5GC). Figure 8 shows the MR-DC mode. For the EN-DC architecture, LTE eNB is MN, NR gNB is SN, and both MN and SN are connected to EPC. For the NE-DC architecture, NR, gNB is MN, eLTE, eNB is SN, and both MN and SN are connected to the next-generation core network. Of course, the types of MN and SN can be the same, both are NRgNB, and both NRgNB are connected to the next-generation core network.

In R15, when RLF occurs on the MN side, it will trigger the UE to perform the RRC connection reestablishment process, resulting in service interruption. When a radio link failure RLF occurs on the SN side, the UE suspends the data transmission on the SCG side and sends SCG RLF indication information to the MN side. The information contains the measurement result.

If a radio link failure occurs, the UE searches for a suitable cell and selects the appropriate cell to initiate the RRC connection reestablishment process. The RRC connection reestablishment process is shown in FIG. 9. First, the terminal sends an RRC connection reestablishment request message to the base station; then, the base station returns an RRC connection reestablishment message to the terminal; and finally, the terminal sends an RRC connection reestablishment complete message to the base station. If the RRC connection re-establishment fails, the RRC connection establishment process will be transferred. As shown in FIG. 10, first, the terminal sends an RRC connection re-establishment request message to the base station; then, the base station returns an RRC establishment message to the terminal; and finally, the terminal sends an RRC establishment complete message to the base station .

The RRC connection reestablishment request message contains the following information content:

Table 2

Among them, in the UE identification information part, the cell RNTI (Cell-RNTI, C-RNTI) is the C-RNTI allocated to the serving cell before the RRC connection failure, and the physical cell identity (Physical Cell Identity, PCI) is the serving cell before the RRC connection failure PCI. MAC-I is an integrity protection verification code calculated using the integrity protection algorithm and secret key configuration configured by the original serving cell.

After the RRC connection reestablishment request message is sent, SRB1 is restored.

The RRC connection reestablishment message is used to restore SRB2 and DRB. Moreover, the RRC connection re-establishment message will be integrity protected and not encrypted.

The RRC connection reestablishment complete message is used to indicate that the RRC connection restoration is complete. And encryption and integrity protection.

At present, the RRC connection reestablishment request will only be initiated to the cell of the same RAT as the serving cell before the RRC connection failure, but during the deployment of the 5G NR cell, the 5G NR cell is covered by hot spots and will not be fully covered, so the RRC connection fails The target cell searched during the RRC connection reestablishment process may not be 5G NR RAT. Or the E-UTRA/5GC connected before the RRC connection failed, and the target cell found in the cell search process is a 5G NR RAT. In order to quickly restore the RRC connection, it makes sense for the UE to perform RRC connection re-establishment on different RATs. At the same time, E-UTRA/5GC is connected to 5GC, and the core network to which NR is connected is also 5GC. In NE-DC and NG EN-DC, it is also possible for the UE to re-establish RRC connection to a different RAT.

FIG. 11 is a first schematic flowchart of an RRC connection reestablishment method provided by an embodiment of the present application. As shown in FIG. 11, the RRC connection reestablishment method includes the following steps:

Step 1101: The target base station receives an RRC connection reestablishment request message sent by the terminal. The RRC connection reestablishment request message carries first information, and the first information is used to address a secondary node. The secondary node and the primary node form a dual connection network , The secondary node stores the first UE context of the terminal, and the primary node stores the second UE context of the terminal; wherein, the RAT to which the target base station belongs is the same as the RAT to which the secondary node belongs.

In the embodiment of the present application, the terminal may be any device that can communicate with a network, such as a mobile phone, a tablet computer, a notebook, or a vehicle-mounted terminal.

In the embodiment of the present application, before the wireless link failure occurs, the network accessed by the terminal is a DC network, the secondary node in the DC network stores the first UE context, and the primary node in the DC network stores the second UE context. The first UE context and the second UE context collectively constitute the UE uplink context of the terminal.

In the embodiment of the present application, after a radio link failure occurs, the terminal searches for the frequency point of the RAT where the primary node is located and the RAT where the secondary node is located, and searches for a suitable cell. When the terminal searches for a suitable cell of the RAT where the secondary node is located, the terminal sends an RRC connection reestablishment request message to the cell (that is, the target cell). Here, the target base station provides the target cell, and the target base station receives the RRC connection reestablishment request message sent by the terminal, and the RRC connection reestablishment request message carries first information, and the first information is used to address the secondary node, wherein, the The first information includes at least one of the following: a first C-RNTI, a first PCI, and a first MAC-I; where,

The first C-RNTI is the C-RNTI allocated by the secondary node to the terminal;

The first PCI is the PCI of the PScell of the secondary node;

The first MAC-I is a MAC-I calculated based on the integrity protection key on the side of the secondary node and the integrity protection algorithm configured by the secondary node, and calculating the input parameters of the MAC-I includes at least the The secondary node allocates the C-RNTI of the terminal, the PCI of the PScell of the secondary node, and the cell identity of the target cell.

Step 1102: The target base station acquires the first UE context on the secondary node side and the second UE context on the primary node side, and sends an RRC connection reestablishment message to the terminal.

In the embodiment of the present application, the target base station may acquire the second UE context on the master node side by way of SN forwarding, or may be acquired directly from the master node. among them:

1) Through SN forwarding

The target base station addresses the secondary node according to the first information and sends a first request UE context request message to the secondary node; wherein the first request UE context request message is received by the secondary node Afterwards, the secondary node sends a second request UE context request message to the master node; after the second request UE context request message is received by the master node, the master node The second UE context is sent to the secondary node; the target base station receives the first UE context on the secondary node side and the second UE context on the primary node side sent by the secondary node.

In the above solution, when the secondary node sends a second request for UE context request message to the primary node, it also sends first indication information to the primary node, where the first indication information is used to indicate that wireless has occurred in the terminal The link fails and requests RRC connection reestablishment.

Optionally, when the master node sends the second UE context on the master node side to the secondary node, it also sends at least one of the following to the secondary node: UE security capability information, the first core network Network element identification information, control plane connection identification information between the master node and the first core network element; accordingly, the target base station receives the first node on the secondary node side sent by the secondary node When receiving the UE context and the second UE context on the master node side, it also receives at least one of the following sent by the slave node: UE security capability information, identification information of the first core network element, the master node and Control plane connection identification information between the network elements of the first core network.

2) The way to get directly from the master node

The target base station addresses the secondary node according to the first information and sends a first request UE context request message to the secondary node; wherein the first request UE context request message is received by the secondary node After that, the secondary node sends a second information request message to the primary node, where the second information request message carries the identification information of the target base station and the cell identity of the target cell; the target base station receives the secondary node Send the second information, and send a third request UE context request message to the master node according to the second information; the target base station receives the second UE context on the master node side sent by the master node, And receiving the first UE context sent by the secondary node on the secondary node side.

In the above solution, the second information includes at least one of the following: an identifier of the master node, a second C-RNTI, a second PCI, and a second MAC-I; wherein,

The second C-RNTI is the C-RNTI allocated by the master node to the terminal;

The second PCI is the PCI of the Pcell of the master node;

The second MAC-I is a MAC-I calculated based on the integrity protection key on the master node side and an integrity protection algorithm configured by the master node, and calculating the input parameters of the MAC-I includes at least all The master node allocates the C-RNTI of the terminal, the PCI of the Pcell of the master node, and the cell identifier of the target cell.

Further, the second MAC-I is obtained in the following manner:

Method 1: The secondary node calculates the second MAC-I on the master node side

After the secondary node sends a request message requesting second UE identification information to the primary node, the secondary node receives the primary node identifier sent by the primary node, and the primary node allocates C- RNTI, PCI of the Pcell of the master node, integrity protection key on the master node side, integrity protection algorithm configured on the master node; the secondary node is based on the integrity protection key on the master node side The integrity protection algorithm configured by the master node, the C-RNTI allocated by the master node to the terminal, the PCI of the Pcell of the master node, and the cell identity of the target cell are calculated to obtain the second MAC-I.

Method 2: The master node calculates the second MAC-I on the master node side

After the secondary node sends a request message requesting second UE identification information to the primary node, the secondary node receives the primary node identifier sent by the primary node, and the primary node allocates C- RNTI, PCI of the Pcell of the master node, and the second MAC-I calculated by the master node.

Optionally, when the target base station receives the second UE context on the master node side sent by the master node, it also receives at least one of the following sent by the master node: UE security capability information, the first core Network network element identification information, control plane connection identification information between the master node and the first core network element.

Step 1103: The target base station receives the RRC connection reestablishment complete message sent by the terminal, and initiates a path switching process to the first core network element.

Here, the first core network element is, for example, an access and mobility management entity (Access and Mobility Management Function, AMF).

The technical solutions of the embodiments of the present application will be exemplified below with reference to specific application examples.

Application example 1: Referring to Figure 12, in the NE-DC or NG EN-DC scenario, RRC is rebuilt to the target cell of the SN RAT, and the SN transfers the UE context on the MN side

1. The UE is in NE-DC or NG EN-DC connection mode, and a wireless link failure occurs.

2. The UE searches for the frequency point of the RAT where the MN is located and the RAT where the SN is located, and searches for a suitable cell.

3. When the UE searches for a suitable cell of the RAT where the SN is located, the UE initiates an RRC connection reestablishment request message to the cell (hereinafter referred to as the target cell), where the UE identification information part in the message: C-RNTI is the one before the RRC connection failure The C-RNTI allocated by the SN, PCI is the PCI of the PScell in the SN before the RRC connection fails. The MAC-I is a MAC-I calculated by using the SN side integrity protection key, the SN configured integrity protection algorithm, the C-RNTI allocated by the SN side, the PCI corresponding to the SN's PScell, and the cell ID of the target cell as inputs.

4. After receiving the RRC connection recovery request message, the target cell addresses the SN according to the UE identification information, and initiates a UE context request message to the SN.

5. The SN receives the context request cell message from the target cell, judges the MN based on the identification information of the UE, and initiates a context request message to the MN, and at the same time indicates that the UE has experienced a radio link failure and requests RRC connection reestablishment.

6. The MN receives the context request message and/or RRC connection re-establishment instruction from the SN node, and sends the UE context information to the SN. Optionally, the MN also sends the UE security capability information, AMF identification information, and between the MN and AMF. The control plane connection identification (AMF, UE, NGAP, ID) between NG-C is sent to the SN.

7. The SN sends the UE context information stored at the SN and the UE context information forwarded by the MN to the target cell. Optionally, the SN will also send the UE security capability information, AMF identification information, NG-C between MN and AMF. The AMF between the UE and the NGAP ID is sent to the target cell.

8. The target cell sends an RRC connection reestablishment message to the UE, and restores SRB2 and DRB.

9. The UE sends an RRC connection reestablishment complete message.

10. After receiving the RRC connection re-establishment complete message, the target cell initiates the path switching process to the AMF.

Application Example 2: Referring to Figure 13, in the NE-DC or NG EN-DC scenario, RRC is rebuilt to the target cell of the SN RAT, and the UE directly obtains the UE context from the MN

3. When the UE finds a suitable cell of the RAT where the SN is located, the UE initiates an RRC connection reestablishment request message to the cell (hereinafter referred to as the target cell). In this message, the UE identification information part: C-RNTI is allocated to the SN before the RRC connection fails In the C-RNTI, PCI is the PCI of the PScell in the SN before the RRC connection fails. MAC-I is the MAC-I calculated using the SN side integrity protection key, the integrity protection algorithm configured by the SN, the C-RNTI assigned by the SN, the PCI corresponding to the SN's PScell, and the cell ID of the target cell as inputs .

5. The SN receives the context request cell from the target cell, and judges the target MN node according to the identification information of the UE:

1) The SN sends a request message requesting the UE's identification information to the MN, which carries the cell ID of the target cell, the MN carries the pcell's PCI in the reply message, the UE's C-RNTI on the MN side, secret key, algorithm, etc. At this time, the SN needs to calculate the MAC-I on the MN side; or,

2) The SN sends a request message requesting the UE's identification information to the MN. The message carries the cell ID of the target cell, the MN carries the base station ID of the MN in the reply message, the PCI of the pcell, the C-RNTI of the UE on the MN side, and the MN calculates MAC-I etc.

6. The SN sends the acquired base station ID of the MN, PCI of the pcell, C-RNTI of the UE on the MN side, and MAC-I on the MN side to the target cell.

7. The target cell initiates the request for context information to the MN based on the information fed back by the SN. The MN forwards the UE context information to the target cell. Optionally, the MN also forwards the UE security capability information, AMF identification information, and the AMF UE-NGAP ID between MN and AMF NG-C to the target cell.

8. After the target cell obtains the UE context information from MN and SN, it restores SRB2 and DRB. And send an RRC connection reestablishment message to the UE.

9. The UE sends an RRC connection reestablishment complete message.

FIG. 14 is a second schematic flowchart of an RRC connection reestablishment method provided by an embodiment of the present application. As shown in FIG. 14, the RRC connection reestablishment method includes the following steps:

Step 1401: The target base station receives an RRC connection reestablishment request message sent by the terminal, where the RRC connection reestablishment request message carries first information, and the first information is used to address the original base station, where the original base station stores the UE of the terminal Context; wherein, the RAT to which the target base station belongs is different from the RAT to which the original base station belongs.

In the embodiment of the present application, before the wireless link failure occurs, the network accessed by the terminal is the SA network, and the original base station stores the UE context.

In the embodiment of the present application, after a radio link failure occurs, the terminal searches for a suitable cell. The terminal initiates an RRC connection reestablishment request message to the cell (ie, the target cell). Here, the target base station provides the target cell, and the target base station receives the RRC connection reestablishment request message sent by the terminal. The RRC connection reestablishment request message carries first information, and the first information is used to address the original base station. The first information includes at least one of the following: a first C-RNTI, a first PCI, and a first MAC-I; where,

The first C-RNTI is the C-RNTI allocated by the original base station to the terminal;

The first PCI is the PCI of the PScell of the original base station;

The first MAC-I is an integrity protection key based on the original base station side, an integrity protection algorithm configured by the original base station, a C-RNTI allocated by the original base station to the terminal, and the original base station The calculated PCI-I of the target cell and the MAC-I of the target cell.

It should be noted that the original base station and the target base station have different RATs. For example: if the original base station is an eNB, then the target base station may be gNB; if the original base station is gNB, then the target base station may be eNB.

Step 1402: The target base station acquires the UE context on the original base station side, and sends an RRC connection reestablishment message to the terminal.

In the embodiment of the present application, the target base station determines the RAT to which the original base station belongs according to the length of the first PCI, and addresses the original base station based on the RAT to which the original base station belongs. Alternatively, the first information further includes second indication information, and the second indication information is used to indicate the RAT to which the original base station belongs; the target base station addresses the original base station based on the RAT to which the original base station belongs.

Optionally, when the target base station receives the UE context sent by the original base station, it also receives at least one of the following sent by the original base station: UE security capability information and identification information of the first core network element , Control plane connection identification information between the original base station and the first core network element.

Step 1403: The target base station receives the RRC connection reestablishment complete message sent by the terminal, and initiates a path switching process to the first core network element.

Here, the first core network element is, for example, AMF.

Application Example 3: Referring to Figure 15, in the SA scenario, the UE connects to NR before the RRC connection fails, and the RRC connection is re-established to E-UTRA

1. The UE is in connected mode, connected to NR, and connected to 5GC. At this time, a wireless link failure occurs.

2. The UE searches for the E-UTRAR frequency point and searches for a suitable cell.

3. When the UE finds a suitable cell for E-UTRA, the UE initiates an RRC connection reestablishment request message to the cell (hereinafter referred to as the target cell). In this message, the UE identification information part: C-RNTI is the NR allocation before the RRC connection fails C-RNTI, PCI is NR PCI before RRC connection failure. MAC-I is calculated using the NR side integrity protection key, the integrity protection algorithm configured by NR, and the target cell's identity. Optionally, the message also carries the indication information of the original RAT.

4. The target cell receives the RRC connection reestablishment request message. If the message carries the indication information of the original RAT, the target cell addresses the original base station on the original RAT according to the indication information and initiates the process of requesting a security context; if the message does not carry the original According to the indication information of the RAT, the target cell determines the original RAT according to the length of the PCI, and then addresses the original base station.

5. The original base station forwards the UE context to the base station where the target cell is located. First, the original base station also transfers the AMF identification information, and the AMF between the NG-C between the target base station and the AMF, UE, and NGAP ID to the target cell.

6. The target cell sends an RRC connection recovery message to the UE.

7. The UE sends an RRC connection reestablishment complete message to the target cell.

8. After receiving the RRC connection reestablishment completion message, the target cell initiates the path switching process to the AMF.

Application Example 4: Referring to Figure 16, in the SA scenario, the UE connects to E-UTRA before the RRC connection fails, and the RRC connection is reestablished to NR

1. The UE is in connected mode, connected to E-UTRA, and connected to 5GC. At this time, a wireless link failure occurs.

2. The UE searches for the NR frequency point and searches for a suitable cell.

3. When the UE finds a suitable cell for NR, the UE initiates an RRC connection reestablishment request message to the cell (hereinafter referred to as the target cell). In this message, the UE identification information part: C-RNTI is the E-UTRA allocation before the RRC connection fails C-RNTI, PCI is E-UTRA PCI before RRC connection failure. MAC-I is calculated using the integrity protection key on the E-UTRA side, the integrity protection algorithm configured by E-UTRA, and the identity of the target cell. Optionally, the message also carries the indication information of the original RAT.

6. The target cell sends an RRC connection recovery message to the UE.

FIG. 17 is a schematic structural composition diagram of an RRC connection reestablishment device provided by an embodiment of the present application. The device is applied to a target base station.

In an application example, the device includes:

The first receiving unit 1701 is configured to receive an RRC connection reestablishment request message sent by a terminal, where the RRC connection reestablishment request message carries first information, and the first information is used to address a secondary node, and the secondary node is formed with the primary node In a dual-connected network, the secondary node stores the first UE context of the terminal, and the primary node stores the second UE context of the terminal; wherein, the RAT to which the target base station belongs and the secondary node to which the secondary node belongs RAT is the same;

The obtaining unit 1702 is configured to obtain the first UE context on the secondary node side and the second UE context on the primary node side, and send an RRC connection reestablishment message to the terminal;

The second receiving unit 1703 is configured to receive the RRC connection reestablishment complete message sent by the terminal, and initiate a path switching process to the first core network element.

In an embodiment, the first information includes at least one of the following: a first C-RNTI, a first PCI, and a first MAC-I; wherein,

The first C-RNTI is the C-RNTI allocated by the secondary node to the terminal;

The first PCI is the PCI of the PScell of the secondary node;

In an embodiment, the obtaining unit 1702 is configured to:

Addressing the secondary node according to the first information and sending a first request UE context request message to the secondary node; wherein, after the first request UE context request message is received by the secondary node, the The secondary node sends a second request UE context request message to the master node; after the second request UE context request message is received by the master node, the master node sends the second UE on the master node side The context is sent to the secondary node;

Receiving the first UE context on the secondary node side and the second UE context on the primary node side sent by the secondary node.

In an embodiment, when the secondary node sends a second request UE context request message to the master node, it also sends first indication information to the master node, where the first indication information is used to indicate that the terminal occurs The wireless link failed and requested RRC connection reestablishment.

In an embodiment, when the master node sends the second UE context on the master node side to the secondary node, it also sends at least one of the following to the secondary node: UE security capability information, the first Identification information of the core network element, control plane connection identification information between the master node and the first core network element;

Correspondingly, when the second receiving unit 1703 receives the first UE context on the secondary node side and the second UE context on the primary node side sent by the secondary node, it also receives at least the following sent by the secondary node One: UE security capability information, identification information of the first core network element, and control plane connection identification information between the master node and the first core network element.

In an embodiment, the obtaining unit 1702 is configured to:

Addressing the secondary node according to the first information and sending a first request UE context request message to the secondary node; wherein, after the first request UE context request message is received by the secondary node, the The secondary node sends a second information request message to the master node, where the second information request message carries identification information of the target base station and identification information of the target cell;

Receiving second information sent by the secondary node, and sending a third request UE context request message to the primary node according to the second information;

Receiving the second UE context on the master node side sent by the master node, and receiving the first UE context on the secondary node side sent by the secondary node.

In an embodiment, the second information includes at least one of the following: an identifier of the master node, a second C-RNTI, a second PCI, and a second MAC-I; wherein,

The second C-RNTI is the C-RNTI allocated by the master node to the terminal;

The second PCI is the PCI of the Pcell of the master node;

The second MAC-I is a MAC-I calculated based on the integrity protection key on the master node side and an integrity protection algorithm configured by the master node, and calculating the input parameters of the MAC-I includes at least all The master node allocates the C-RNTI for the terminal and the PCI of the master node's Pcell and identification information of the target cell.

In one embodiment, the second MAC-I is obtained in the following manner:

In an embodiment, when the second receiving unit 1703 receives the second UE context on the master node side sent by the master node, it also receives at least one of the following sent by the master node: UE security capability information, Identification information of the first core network element and control plane connection identification information between the master node and the first core network element.

In another example, the apparatus includes:

The first receiving unit 1701 is configured to receive an RRC connection reestablishment request message sent by a terminal. The RRC connection reestablishment request message carries first information, and the first information is used to address an original base station, and the original base station stores the UE context of the terminal; wherein, the RAT to which the target base station belongs is different from the RAT to which the original base station belongs;

An obtaining unit 1702, configured to obtain the UE context on the original base station side, and send an RRC connection reestablishment message to the terminal;

The first PCI is the PCI of the PScell of the original base station;

In an embodiment, the device further includes:

A determining unit (not shown in the figure) is configured to determine the RAT to which the original base station belongs according to the length of the first PCI, and address the original base station based on the RAT to which the original base station belongs.

In an embodiment, the device further includes:

The determining unit (not shown in the figure) is configured to address the original base station based on the RAT to which the original base station belongs.

In an embodiment, when the acquiring unit 1702 receives the UE context sent by the original base station, it also receives at least one of the following sent by the original base station: UE security capability information, the first core network element Identification information of the original control station and the connection information of the control plane between the original base station and the first core network element.

Those skilled in the art should understand that the relevant description of the above-mentioned RRC connection re-establishment device of the embodiment of the present application can be understood with reference to the relevant description of the RRC connection re-establishment method of the embodiment of the present application.

18 is a schematic structural diagram of a communication device 600 provided by an embodiment of the present application. The communication device may be a network device, such as a base station. The communication device 600 shown in FIG. 18 includes a processor 610. The processor 610 may call and run a computer program from a memory to implement the method in the embodiments of the present application.

Optionally, as shown in FIG. 18, the communication device 600 may further include a memory 620. The processor 610 can call and run a computer program from the memory 620 to implement the method in the embodiments of the present application.

The memory 620 may be a separate device independent of the processor 610, or may be integrated in the processor 610.

Optionally, as shown in FIG. 18, the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices, specifically, may send information or data to other devices, or receive other Information or data sent by the device.

Among them, the transceiver 630 may include a transmitter and a receiver. The transceiver 630 may further include antennas, and the number of antennas may be one or more.

Optionally, the communication device 600 may specifically be a network device according to an embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the network device in each method of the embodiment of the present application. .

Optionally, the communication device 600 may specifically be the mobile terminal/terminal of the embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the mobile terminal/terminal in each method of the embodiment of the present application. This will not be repeated here.

19 is a schematic structural diagram of a chip according to an embodiment of the present application. The chip 700 shown in FIG. 19 includes a processor 710, and the processor 710 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 19, the chip 700 may further include a memory 720. The processor 710 can call and run a computer program from the memory 720 to implement the method in the embodiments of the present application.

The memory 720 may be a separate device independent of the processor 710, or may be integrated in the processor 710.

Optionally, the chip 700 may further include an input interface 730. The processor 710 can control the input interface 730 to communicate with other devices or chips. Specifically, it can obtain information or data sent by other devices or chips.

Optionally, the chip 700 may further include an output interface 740. The processor 710 can control the output interface 740 to communicate with other devices or chips. Specifically, it can output information or data to 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 of the embodiment of the present application. For the sake of brevity, no further description is provided here.

Optionally, the chip can be applied to the mobile terminal/terminal in the embodiments of the present application, and the chip can implement the corresponding process implemented by the mobile terminal/terminal in each method of the embodiments of the present application. Repeat.

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

20 is a schematic block diagram of a communication system 900 provided by an embodiment of the present application. As shown in FIG. 20, the communication system 900 includes a terminal 910 and a network device 920.

The terminal 910 may be used to implement the corresponding functions implemented by the terminal in the above method, and the network device 920 may be used to implement the corresponding functions implemented by the network device in the above method.

It should be understood that the processor in the embodiment of the present application may be an integrated circuit chip, which has signal processing capabilities. In the implementation process, the steps of the foregoing method embodiments may be completed by instructions in the form of hardware integrated logic circuits or software in the processor. The aforementioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an existing programmable gate array (Field Programmable Gate Array, FPGA), or other available Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application may be implemented or executed. The 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 conjunction with the embodiments of the present application may be directly embodied and executed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, and a register. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electronically Erase Programmable Read Only Memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache. 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 dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (Synchlink DRAM, SLDRAM) ) And direct memory bus random access memory (Direct Rambus RAM, DR RAM). It should be noted that the memories of the systems and methods described herein are intended to include, but are not limited to these and any other suitable types of memories.

It should be understood that the foregoing memory is exemplary but not limiting, for example, the memory in the embodiments of the present application may also be 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) SDRAM (DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM) and so on. That is to say, the memories in the embodiments of the present application are intended to include but are not limited to these and any other suitable types of memories.

Embodiments of the present application also provide a computer-readable storage medium for storing computer programs.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiments of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiments of the present application. For brevity, here No longer.

Optionally, the computer-readable storage medium may be applied to the mobile terminal/terminal in the embodiments of the present application, and the computer program causes the computer to execute the corresponding processes implemented by the mobile terminal/terminal in each method of the embodiments of the present application, in order to It is concise and will not be repeated here.

An embodiment of the present application also provides a computer program product, including computer program instructions.

Optionally, the computer program product may be applied to the network device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. Repeat again.

Optionally, the computer program product can be applied to the mobile terminal/terminal in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the mobile terminal/terminal in each method of the embodiment of the present application, for simplicity And will not be repeated here.

An embodiment of the present application also provides a computer program.

Optionally, the computer program can be applied to the network device in the embodiment of the present application. When the computer program runs on the computer, the computer is allowed to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. And will not be repeated here.

Alternatively, the computer program can be applied to the mobile terminal/terminal in the embodiments of the present application, and when the computer program runs on the computer, the computer is allowed to execute the corresponding implementation of the mobile terminal/terminal in each method of the embodiments of the present application For the sake of brevity, I will not repeat them here.

Those of ordinary skill in the art may realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application of the technical solution and design constraints. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that for the convenience and conciseness of the description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments, and details are not described herein again.

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

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

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

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

Claims

A radio resource control RRC connection reestablishment method, the method includes:

The target base station receives an RRC connection reestablishment request message sent by the terminal. The RRC connection reestablishment request message carries first information, and the first information is used to address a secondary node. The secondary node and the primary node form a dual connection network. The secondary node stores the first UE context of the terminal, and the primary node stores the second UE context of the terminal; wherein, the radio access type RAT to which the target base station belongs is the same as the RAT to which the secondary node belongs ;

The target base station acquires the first UE context on the secondary node side and the second UE context on the master node side, and sends an RRC connection reestablishment message to the terminal;

The target base station receives the RRC connection reestablishment complete message sent by the terminal, and initiates a path switching process to the first core network element.
The method according to claim 1, wherein the first information includes at least one of the following: a first C-RNTI, a first PCI, and a first MAC-I; wherein,

The first C-RNTI is the C-RNTI allocated by the secondary node to the terminal;

The first PCI is the PCI of the PScell of the secondary node;

The first MAC-I is a MAC-I calculated based on the integrity protection key on the side of the secondary node and the integrity protection algorithm configured by the secondary node, and calculating the input parameters of the MAC-I includes at least the The secondary node allocates the C-RNTI of the terminal, the PCI of the PScell of the secondary node, and the cell identity of the target cell.
The method according to claim 1 or 2, wherein the target base station acquiring the first UE context on the secondary node side and the second UE context on the primary node side includes:

The target base station addresses the secondary node according to the first information and sends a first request UE context request message to the secondary node; wherein the first request UE context request message is received by the secondary node Afterwards, the secondary node sends a second request UE context request message to the master node; after the second request UE context request message is received by the master node, the master node The second UE context is sent to the secondary node;

The target base station receives the first UE context on the secondary node side and the second UE context on the primary node side sent by the secondary node.
The method according to claim 3, wherein when the secondary node sends a second request UE context request message to the primary node, it also sends first indication information to the primary node, the first indication information is used to Indicates that the terminal has experienced a radio link failure and requests RRC connection reestablishment.
The method according to claim 3 or 4, wherein when the master node sends the second UE context on the master node side to the secondary node, at least one of the following is also sent to the secondary node: UE security Capability information, identification information of the first core network element, and control plane connection identification information between the master node and the first core network element;

Correspondingly, when the target base station receives the first UE context on the secondary node side and the second UE context on the primary node side sent by the secondary node, it also receives at least one of the following sent by the secondary node: UE security capability information, identification information of the first core network element, control plane connection identification information between the master node and the first core network element.
The method according to claim 1 or 2, wherein the target base station acquiring the first UE context on the secondary node side and the second UE context on the primary node side includes:

The target base station addresses the secondary node according to the first information and sends a first request UE context request message to the secondary node; wherein the first request UE context request message is received by the secondary node After that, the secondary node sends a second information request message to the master node, where the second information request message carries the identification information of the target base station and the cell identification of the target cell;

The target base station receives the second information sent by the secondary node, and sends a third request UE context request message to the master node according to the second information;

The target base station receives the second UE context on the master node side sent by the master node, and receives the first UE context on the secondary node side sent by the secondary node.
The method according to claim 6, wherein the second information includes at least one of the following: an identifier of the master node, a second C-RNTI, a second PCI, and a second MAC-I; wherein,

The second C-RNTI is the C-RNTI allocated by the master node to the terminal;

The second PCI is the PCI of the Pcell of the master node;

The second MAC-I is a MAC-I calculated based on the integrity protection key on the master node side and an integrity protection algorithm configured by the master node, and calculating the input parameters of the MAC-I includes at least all The master node allocates the C-RNTI of the terminal, the PCI of the Pcell of the master node, and the cell identifier of the target cell.
The method according to claim 7, wherein the second MAC-I is obtained by:

After the secondary node sends a request message requesting second UE identification information to the primary node, the secondary node receives the primary node identifier sent by the primary node, and the primary node allocates C- RNTI, PCI of the Pcell of the master node, integrity protection key on the master node side, integrity protection algorithm configured on the master node; the secondary node is based on the integrity protection key on the master node side The integrity protection algorithm configured by the master node, the C-RNTI allocated by the master node to the terminal, the PCI of the Pcell of the master node, and the cell identity of the target cell are calculated to obtain the second MAC-I.
The method according to claim 7, wherein the second MAC-I is obtained by:

After the secondary node sends a request message requesting second UE identification information to the primary node, the secondary node receives the primary node identifier sent by the primary node, and the primary node allocates C- RNTI, PCI of the Pcell of the master node, and the second MAC-I calculated by the master node.
The method according to any one of claims 6 to 9, wherein when the target base station receives the second UE context of the master node side sent by the master node, it also receives at least one of the following sent by the master node One: UE security capability information, identification information of the first core network element, control plane connection identification information between the master node and the first core network element.
An RRC connection reestablishment method, the method includes:

The target base station receives an RRC connection reestablishment request message sent by the terminal, where the RRC connection reestablishment request message carries first information, and the first information is used to address the original base station, where the original base station stores the UE context of the terminal; where , The RAT to which the target base station belongs is different from the RAT to which the original base station belongs;

The target base station acquires the UE context on the original base station side, and sends an RRC connection reestablishment message to the terminal;

The target base station receives the RRC connection reestablishment complete message sent by the terminal, and initiates a path switching process to the first core network element.
The method according to claim 11, wherein the first information includes at least one of the following: a first C-RNTI, a first PCI, and a first MAC-I; wherein,

The first C-RNTI is the C-RNTI allocated by the original base station to the terminal;

The first PCI is the PCI of the PScell of the original base station;

The first MAC-I is an integrity protection key based on the original base station side, an integrity protection algorithm configured by the original base station, a C-RNTI allocated by the original base station to the terminal, and the original base station The calculated PCI-I of the target cell and the MAC-I of the target cell.
The method according to claim 12, wherein the target base station determines the RAT to which the original base station belongs according to the length of the first PCI, and addresses the original base station based on the RAT to which the original base station belongs.
The method according to claim 12, wherein the first information further includes second indication information, and the second indication information is used to indicate the RAT to which the original base station belongs;

The target base station addresses the original base station based on the RAT to which the original base station belongs.
The method according to any one of claims 11 to 14, wherein when the target base station receives the UE context sent by the original base station, it also receives at least one of the following: the UE security capability information sent by the original base station 2. Identification information of the first core network element, control plane connection identification information between the original base station and the first core network element.
An RRC connection reestablishment device is applied to a target base station. The device includes:

A first receiving unit, configured to receive an RRC connection reestablishment request message sent by a terminal, the RRC connection reestablishment request message carrying first information, the first information is used to address a secondary node, and the secondary node and the primary node form a double Connect to the network, the secondary node stores the first UE context of the terminal, and the primary node stores the second UE context of the terminal; wherein, the RAT to which the target base station belongs and the RAT to which the secondary node belongs the same;

An obtaining unit, configured to obtain the first UE context on the secondary node side and the second UE context on the master node side, and send an RRC connection reestablishment message to the terminal;

The second receiving unit is configured to receive the RRC connection reestablishment complete message sent by the terminal, and initiate a path switching process to the first core network element.
The apparatus according to claim 16, wherein the first information includes at least one of the following: a first C-RNTI, a first PCI, and a first MAC-I; wherein,

The first C-RNTI is the C-RNTI allocated by the secondary node to the terminal;

The first PCI is the PCI of the PScell of the secondary node;

The first MAC-I is a MAC-I calculated based on the integrity protection key on the side of the secondary node and the integrity protection algorithm configured by the secondary node, and calculating the input parameters of the MAC-I includes at least the The secondary node allocates the C-RNTI of the terminal, the PCI of the PScell of the secondary node, and the cell identity of the target cell.
The apparatus according to claim 16 or 17, wherein the acquisition unit is configured to:

Addressing the secondary node according to the first information and sending a first request UE context request message to the secondary node; wherein, after the first request UE context request message is received by the secondary node, the The secondary node sends a second request UE context request message to the master node; after the second request UE context request message is received by the master node, the master node sends the second UE on the master node side The context is sent to the secondary node;

Receiving the first UE context on the secondary node side and the second UE context on the primary node side sent by the secondary node.
The apparatus according to claim 18, wherein when the secondary node sends a second request UE context request message to the primary node, it also sends first indication information to the primary node, the first indication information is used to Indicates that the terminal has experienced a radio link failure and requests RRC connection reestablishment.
The apparatus according to claim 18 or 19, wherein when the master node sends the second UE context on the master node side to the secondary node, it further sends at least one of the following to the secondary node: UE security Capability information, identification information of the first core network element, and control plane connection identification information between the master node and the first core network element;

Correspondingly, when the second receiving unit receives the first UE context on the secondary node side and the second UE context on the primary node side sent by the secondary node, it also receives at least one of the following sent by the secondary node One: UE security capability information, identification information of the first core network element, control plane connection identification information between the master node and the first core network element.
The apparatus according to claim 16 or 17, wherein the acquisition unit is configured to:

Addressing the secondary node according to the first information and sending a first request UE context request message to the secondary node; wherein, after the first request UE context request message is received by the secondary node, the The secondary node sends a second information request message to the master node, where the second information request message carries identification information of the target base station and identification information of the target cell;

Receiving second information sent by the secondary node, and sending a third request UE context request message to the primary node according to the second information;

Receiving the second UE context on the master node side sent by the master node, and receiving the first UE context on the secondary node side sent by the secondary node.
The apparatus according to claim 21, wherein the second information includes at least one of the following: an identifier of the master node, a second C-RNTI, a second PCI, and a second MAC-I; wherein,

The second C-RNTI is the C-RNTI allocated by the master node to the terminal;

The second PCI is the PCI of the Pcell of the master node;

The second MAC-I is a MAC-I calculated based on the integrity protection key on the master node side and an integrity protection algorithm configured by the master node, and calculating the input parameters of the MAC-I includes at least all The master node allocates the C-RNTI for the terminal and the PCI of the master node's Pcell and identification information of the target cell.
The apparatus according to claim 22, wherein the second MAC-I is obtained by:

After the secondary node sends a request message requesting second UE identification information to the primary node, the secondary node receives the primary node identifier sent by the primary node, and the primary node allocates C- RNTI, PCI of the Pcell of the master node, integrity protection key on the master node side, integrity protection algorithm configured on the master node; the secondary node is based on the integrity protection key on the master node side The integrity protection algorithm configured by the master node, the C-RNTI allocated by the master node to the terminal, the PCI of the Pcell of the master node, and the cell identity of the target cell are calculated to obtain the second MAC-I.
The apparatus according to claim 22, wherein the second MAC-I is obtained by:

After the secondary node sends a request message requesting second UE identification information to the primary node, the secondary node receives the primary node identifier sent by the primary node, and the primary node allocates C- RNTI, PCI of the Pcell of the master node, and the second MAC-I calculated by the master node.
The apparatus according to any one of claims 21 to 24, wherein when the second receiving unit receives the second UE context on the master node side sent by the master node, it also receives the following sent by the master node At least one of: UE security capability information, identification information of the first core network element, control plane connection identification information between the master node and the first core network element.
An RRC connection reestablishment device is applied to a target base station. The device includes:

A first receiving unit, configured to receive an RRC connection reestablishment request message sent by a terminal, the RRC connection reestablishment request message carrying first information, the first information is used to address an original base station, and the original base station stores the terminal UE context; wherein, the RAT to which the target base station belongs is different from the RAT to which the original base station belongs;

An obtaining unit, configured to obtain the UE context on the original base station side, and send an RRC connection reestablishment message to the terminal;

The second receiving unit is configured to receive the RRC connection reestablishment complete message sent by the terminal, and initiate a path switching process to the first core network element.
The apparatus according to claim 26, wherein the first information includes at least one of the following: a first C-RNTI, a first PCI, and a first MAC-I; wherein,

The first C-RNTI is the C-RNTI allocated by the original base station to the terminal;

The first PCI is the PCI of the PScell of the original base station;

The first MAC-I is an integrity protection key based on the original base station side, an integrity protection algorithm configured by the original base station, a C-RNTI allocated by the original base station to the terminal, and the original base station The calculated PCI-I of the target cell and the MAC-I of the target cell.
The device of claim 27, wherein the device further comprises:

The determining unit is configured to determine the RAT to which the original base station belongs according to the length of the first PCI, and address the original base station based on the RAT to which the original base station belongs.
The device of claim 27, wherein the device further comprises:

The determining unit is configured to address the original base station based on the RAT to which the original base station belongs.
The apparatus according to any one of claims 26 to 29, wherein when the acquiring unit receives the UE context sent by the original base station, it further receives at least one of the following: the UE security capability information sent by the original base station 2. Identification information of the first core network element, control plane connection identification information between the original base station and the first core network element.
A network device, comprising: a processor and a memory, the memory is used to store a computer program, the processor is used to call and run the computer program stored in the memory, and executes any one of claims 1 to 10 Method, or the method of any one of claims 11 to 15.
A chip, including: a processor, for calling and running a computer program from a memory, so that a device installed with the chip executes the method according to any one of claims 1 to 10, or claims 11 to 15 The method as described in any one.
A computer-readable storage medium for storing a computer program that causes a computer to execute the method according to any one of claims 1 to 10, or the method according to any one of claims 11 to 15. .
A computer program product comprising computer program instructions which causes a computer to perform the method according to any one of claims 1 to 10, or the method according to any one of claims 11 to 15.
A computer program that causes a computer to execute the method according to any one of claims 1 to 10, or the method according to any one of claims 11 to 15.