Patent Description:
The 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) radio access network RAN mainly defines two evolution directions for a <NUM> system: eLTE and <NUM> new radio NR. eLTE refers to a <NUM> core network (NGC, from R15) accessed via an LTE air interface. The eLTE project is successfully initiated at the RAN #<NUM> meeting (RP-<NUM>), and is discussed at the RAN2 #<NUM> meeting.

There are a plurality of possibilities of LTE deployment. For example, an LTE base station is connected to both an EPC (<NUM> core network) and an NGC (<NUM> core network); or the LTE base station is connected only to a 5GC or an LTE base station is connected only to an EPC.

An RRC reestablishment process includes the following steps:.

Reestablishment is an operation performed when the UE needs to access a network again because a failure occurs in a current cell or a handover failure occurs.

In an EN-DC (LTE and NR dual connectivity) access process, by default, signaling radio bearers (SRB1/<NUM>) first use the LTE Packet Data Convergence Protocol (Packet Data Convergence Protocol, PDCP), and then after an msg5 is transmitted, the network and the UE automatically implicitly switch to use NR PDCP. Subsequently, before a security activation command is transmitted, the SRB2 is reconfigured to use NR PDCP.

In the RRC reestablishment process in eLTE, which PDCP type should be used by the SRB1 and when the PDCP type should be switched are not discussed or specified. In addition, how a network side determines an ECGI reported during reestablishment if a cell simultaneously supports two core networks is not defined either.

3GPP contribution titled "OFFLINE#<NUM> LTE re-establishment and resume while using NR PDCP (Ericsson)" discusses the issue of LTE re-establishment in case NR PDCP was configured for some bearers.

The present disclosure provides a bearer configuration method for RRC connection reestablishment, a terminal, a computer readable storage medium storing therein a computer program, and a computer program product as defined in accompanying claims.

In a first aspect, a bearer configuration method for RRC connection reestablishment performed by a terminal as claimed in accompanying claims is provided.

In a second aspect, a terminal as claimed in accompanying claims is provided.

In a third aspect, computer-readable storage media storing therein a computer program as claimed in accompanying claims are provided.

In a fourth aspect, computer program products as claimed in accompanying claims are provided.

To describe the technical solutions in the embodiments of this disclosure more clearly, the following briefly describes the accompanying drawings required for describing the embodiments of this disclosure. Apparently, the accompanying drawings in the following description show merely some embodiments of this disclosure, and persons of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

The following describes exemplary embodiments of this disclosure in more detail with reference to the accompanying drawings.

The terms "first", "second", and the like in this specification and claims of this application are used to distinguish between similar objects instead of describing a specific order or sequence. It should be understood that the data used in this way is interchangeable in appropriate circumstances so that the embodiments of this application described herein can be implemented in other orders than the order illustrated or described herein. In addition, the terms "include", "have", and any other variant thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that includes a list of steps or units is not necessarily limited to those steps or units that are expressly listed, but may include other steps or units that are not expressly listed or are inherent to the process, method, system, product, or device. The term "and/or" used in this specification and claims indicates at least one of connected objects.

<FIG> is a structural diagram of a network system to which an embodiment of this disclosure may be applied. As shown in <FIG>, the network system includes a user terminal <NUM> and a base station <NUM>. The user terminal <NUM> may be user equipment (User Equipment, UE), for example, may be a terminal device such as a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a personal digital assistant (personal digital assistant, PDA), a mobile Internet device (Mobile Internet Device, MID), or a wearable device (Wearable Device). It should be noted that a specific type of the user terminal <NUM> is not limited in the embodiments of this disclosure. The base station <NUM> may be a base station (for example, a gNB or a <NUM> NR NB) in <NUM> or a later version, or a base station in another communications system, or is referred to as a NodeB, an evolved NodeB, a transmission and reception point (TRP), or another term in the field. As long as a same technical effect is achieved, the base station is not limited to a specific technical term. It should be noted that only a <NUM> base station is used as an example in the embodiments of this disclosure, but a specific type of the base station <NUM> is not limited.

<FIG> is a schematic flowchart of a bearer configuration method for radio resource control (RRC) connection reestablishment according to an embodiment of this disclosure. As shown in <FIG>, an embodiment of this disclosure provides a bearer configuration method for RRC connection reestablishment. The method is applied to a network device, and includes the following steps.

Step <NUM>: When receiving an RRC reestablishment complete message sent by a terminal, determine a Packet Data Convergence Protocol (PDCP) type supported by a target network to be accessed by the terminal, where the PDCP type includes type-<NUM> PDCP supporting a first network or type-<NUM> PDCP supporting a second network.

The first network may be specifically an LTE network, and the second network may be an NR network. RRC connection reestablishment in this embodiment of this disclosure includes reestablishment from an eLTE network to an LTE or NR (eLTE) network.

In a specific embodiment of this disclosure, the terminal first determines a PDCP type for performing PDCP configuration for an SRB <NUM> (signaling radio bearer (SRB)<NUM>) for sending the RRC reestablishment complete message; the terminal sends the RRC reestablishment complete message to the network device based on the PDCP type for performing the PDCP configuration; and when receiving the RRC reestablishment complete message sent by the terminal, the network device determines the PDCP type supported by the target network to be accessed by the terminal.

Step <NUM>: Reconfigure bearers in a subsequent RRC process based on the determined PDCP type.

Herein, bearers in an RRC reestablishment process include at least one of the SRB <NUM>, an SRB2, and a DRB (data radio bearer).

According to the bearer configuration method for RRC connection reestablishment in this embodiment of this disclosure, when the RRC reestablishment complete message sent by the terminal is received, the PDCP type supported by the target network to be accessed by the terminal is determined; and the bearers in the subsequent RRC process are reconfigured based on the determined PDCP type. Therefore, when a terminal in an eLTE or NR cell performs RRC connection reestablishment, the terminal can determine PDCP used by bearers in an RRC reestablishment process, thereby ensuring success of RRC reestablishment.

Herein, if the UE first configures the SRB1 by using LTE PDCP, and the target network to be accessed supports NR PDCP, any bearer (including the SRB1, the SRB2, and the data radio bearer DRB) may be reconfigured subsequently by using NR PDCP (that is, configured by using the type-<NUM> PDCP); or
if the target network to be accessed does not support NR PDCP, the network may switch all the bearers to LTE PDCP (that is, the type-<NUM> PDCP) in a full configuration (full configuration) mode.

In this embodiment of this disclosure, there are two types of communication pipes between an eNodeB and UE: SRB and DRB. The data radio bearer (Data Radio Bearer, DRB) is used for data transmission. Establishment of the DRB is completed by using a reconfiguration message (RRC Connection Reconfiguration).

The signaling radio bearer (Signaling Radio Bearer, SRB) is used for control signaling transmission, and is classified into three types: SRB0, SRB <NUM>, and SRB2. The SRB0 does not need to be established. The SRB0 is used to transmit signaling mapped to a common control channel CCCH, and has six RRC messages. An objective of performing RRC connection establishment is to establish the SRB1, and then transmit other RRC messages by using the SRB1.

The reconfiguring all bearers in an RRC reestablishment process by using the type-<NUM> PDCP may include: reconfiguring all the bearers in the RRC reestablishment process by using the type-<NUM> PDCP and reconfiguration signaling; or
after a preset message is transmitted or a predetermined condition is satisfied in the RRC reestablishment process, reconfiguring all the bearers in the RRC reestablishment process by using the type-<NUM> PDCP.

The preset message includes the RRC reestablishment complete message. For example, after the RRC reestablishment complete message is transmitted, the network and the UE implicitly switch to NR PDCP. The predetermined condition may be agreed upon or defined beforehand.

Based on this, after the reconfiguring all bearers in an RRC reestablishment process by using the type-<NUM> PDCP, the method may further include: mapping a QoS flow to an evolved packet system (EPS) bearer; deleting an established SDAP entity; and converting a key of an NR core network to a key of an LTE core network through mapping, to obtain a key used by an LTE air interface. Therefore, the network device (such as a base station) can switch from an NR system to an LTE system.

Herein, the UE uses LTE PDCP for configuring the SRB1, and the UE completes calculation of a MAC-I by using an original key and an algorithm; mapping a QoS flow to an EPS bearer ID and deleting a SDAP entity are completed in the UE and the network device separately; and converting a key of one core network (NR 5GC) to a key of another core network (LTE EPC) through mapping to derive a key used by an air interface is completed in the UE and the network device separately, so that after LTE PDCP configuration is performed, signal processing can be performed based on the new configuration.

Herein, the UE first uses NR PDCP for configuration during reestablishment. If the target access network supports NR PDCP, all previously reserved bearers may be supported, or may be reconfigured to use LTE PDCP. If the target access network does not support NR PDCP, but the network device recognizes the RRC reestablishment complete message, the network device may switch all bearers to LTE PDCP in a full configuration (full configuration) mode. If the target access network does not support NR PDCP, and the network device does not recognize the RRC reestablishment complete message, the network device may reject the message and cannot perform a subsequent procedure.

Based on this, the UE uses NR PDCP for configuration during reestablishment. The UE is allowed to initiate an RRC reestablishment request by using an NR RRC reestablishment request message; or the UE is allowed to initiate an RRC reestablishment request by using an LTE RRC reestablishment request message. In this case, a key (key), SDAP, and PDCP configurations may be reused, a default configuration of a corresponding standard is used for an RLC layer, and the RLC layer, an MAC layer, and PHY layers of the UE may be reconfigured by using air interface resource configuration signaling.

Further, when reestablishment occurs in an eLTE cell, the terminal needs to report CGI information in a failure report, where the CGI information includes a primary public land mobile network (PLMN) identity.

Based on this, the bearer configuration method for RRC connection reestablishment in this embodiment of this disclosure further includes:
receiving a radio link failure report sent by the terminal, where the radio link failure report carries cell global identity (CGI) information, and the CGI information includes a PLMN identity.

The primary PLMN is a first one in the PLMN list of the LTE core network; or.

In a specific embodiment of this disclosure, before reestablishment occurs, the terminal may further select, based on a type of a cell in which the terminal is located, a corresponding primary PLMN for reporting, for example, report a first PLMN in a 5GC list in eLTE, and report a first PLMN in an EPC list in LTE.

According to the bearer configuration method for RRC connection reestablishment in this embodiment of this disclosure, when the RRC reestablishment complete message sent by the terminal is received, the PDCP type supported by the target network to be accessed by the terminal is determined; and the bearers in the RRC reestablishment process are reconfigured based on the determined PDCP type. Therefore, when a terminal in an eLTE or NR cell performs RRC connection reestablishment, the terminal can determine PDCP used by bearers in an RRC reestablishment process, thereby ensuring success of RRC reestablishment.

As shown in <FIG>, an embodiment of this disclosure further provides a bearer configuration method for RRC connection reestablishment. The method is applied to a terminal, and includes the following steps.

Step <NUM>: Determine a PDCP type for performing PDCP configuration for an SRB <NUM> for sending an RRC reestablishment complete message, where the PDCP type includes type-<NUM> PDCP supporting a first network or type-<NUM> PDCP supporting a second network.

The first network may be specifically an LTE network, and the second network may be an NR (or eLTE) network. RRC connection reestablishment in this embodiment of this disclosure includes reestablishment from an eLTE network to an LTE or NR (or eLTE) network. The used PDCP type may be selected by the UE based on a standard, or may be configured by a network for the terminal beforehand.

Step <NUM>: Send the RRC reestablishment complete message to a network device based on the PDCP type for performing the PDCP configuration.

In this embodiment of this disclosure, the terminal determines the PDCP type for performing the PDCP configuration for the SRB <NUM> for sending the RRC reestablishment complete message; and the terminal sends the RRC reestablishment complete message to the network device based on the PDCP type for performing the PDCP configuration, so that the terminal can determine the PDCP type used by the SRB <NUM> in an RRC reestablishment process.

Further, step <NUM> includes:
determining that the PDCP type for performing the PDCP configuration for the SRB <NUM> for sending the RRC reestablishment complete message is the type-<NUM> PDCP.

Further, step <NUM> of determining a PDCP type for performing PDCP configuration for an SRB1 for sending an RRC reestablishment complete message includes:
determining, in a predefined manner, not being according to the invention as claimed, or when detecting that a PDCP type supported by a target access network is not the type-<NUM> PDCP, or when access times out, that the PDCP type for performing the PDCP configuration for the SRB <NUM> for sending the RRC reestablishment complete message falls back to the type-<NUM> PDCP.

The UE first uses NR PDCP for configuration during reestablishment. If the UE subsequently detects that the target access network does not support NR PDCP (for example, access timeout or failure), the UE automatically falls back (fallback) to use LTE PDCP for configuring the SRB <NUM> to perform a reestablishment operation.

Based on this, after the sending the RRC reestablishment complete message to the network device, the method further includes:
mapping a QoS flow to an EPS bearer; deleting an established SDAP entity; and converting a key of an NR core network to a key of an LTE core network through mapping, to obtain a key used by an LTE air interface.

Herein, the UE uses LTE PDCP for configuring the SRB1, and the UE completes calculation of a MAC-I by using an original key and an algorithm; mapping a QoS flow to an EPS bearer ID and deleting a SDAP entity are completed in the UE and the network device; and converting a key of one core network (such as an NR 5GC) to a key of another core network (such as an LTE EPC) through mapping to derive a key used by an air interface is completed in the UE and the network device separately.

Further, step <NUM> of determining a PDCP type for performing PDCP configuration for an SRB1 for sending an RRC reestablishment complete message includes:
determining, in a predefined manner, not being according to the invention as claimed, or when detecting that a PDCP type supported by a target network to be accessed is the type-<NUM> PDCP, that the PDCP type for performing the PDCP configuration for the SRB <NUM> for sending the RRC reestablishment complete message is the type-<NUM> PDCP.

Herein, the UE needs to use NR PDCP for configuration during reestablishment, and a cell to be accessed definitely supports eLTE by default. To be specific, reestablishment across CNs (EPC and NGC) is not allowed. A network side learns context information of the UE beforehand. If reestablishment fails, cell selection is performed again.

Further, before the sending the RRC reestablishment complete message to the network device, the method may further include:.

Further, after the initiating an RRC reestablishment request by using an NR RRC reestablishment request message based on a network standard to be reestablished, or initiating an RRC reestablishment request by using an LTE RRC reestablishment request message, the method may further include:
using a default configuration of a corresponding standard for an RLC layer, and reconfiguring the RLC layer, an MAC layer, and a PHY layer of the terminal by using air interface resource configuration signaling.

The UE uses NR PDCP for configuration during reestablishment. The UE is allowed to initiate the RRC reestablishment request by using the NR RRC reestablishment request message; or the UE is allowed to initiate the RRC reestablishment request by using the LTE RRC reestablishment request message. In this case, a key, SDAP, and PDCP configurations may be reused, the default configuration of the corresponding standard is used for an RLC layer, and the RLC layer, an MAC layer, and PHY layers of the UE may be reconfigured by using the air interface resource configuration signaling.

Further, before the initiating an RRC reestablishment request, the bearer configuration method further includes:
sending a radio link failure report to the network device, where the radio link failure report carries CGI information, and the CGI information includes a PLMN identity.

In the bearer configuration method for RRC connection reestablishment in this embodiment of this disclosure, the terminal determines the PDCP type for performing the PDCP configuration for the SRB <NUM> for sending the RRC reestablishment complete message; and the terminal sends the RRC reestablishment complete message to the network device based on the PDCP type for performing the PDCP configuration, so that the terminal can determine the PDCP type used by the SRB1 in the RRC reestablishment process.

<FIG> is a schematic modular diagram of a terminal according to an embodiment of this disclosure. As shown in <FIG>, an embodiment of this disclosure further provides a terminal <NUM>, including:.

In the terminal in this embodiment of this disclosure, the determining module is configured to determine that the PDCP type for performing the PDCP configuration for the SRB1 is the type-<NUM> PDCP when the RRC reestablishment complete message is sent.

In the terminal in this embodiment of this disclosure, the determining module is configured to determine, in a predefined manner, not being according to the invention as claimed, or when detecting that a PDCP type supported by a target access network is not the type-<NUM> PDCP, or when terminal access times out, that the PDCP type for performing the PDCP configuration for the SRB1 falls back to the type-<NUM> PDCP when the RRC reestablishment complete message is sent.

The terminal in this embodiment of this disclosure further includes:.

In the terminal in this embodiment of this disclosure, the determining module is configured to determine, in a predefined manner, not being according to the invention as claimed, or when detecting that a PDCP type supported by a target network to be accessed is the type-<NUM> PDCP, that the PDCP type for performing the PDCP configuration for the SRB1 is the type-<NUM> PDCP when the RRC reestablishment complete message is sent.

In the terminal in this embodiment of this disclosure, the first sending module is further configured to: initiate an RRC reestablishment request by using an NR RRC reestablishment request message based on a network standard to be reestablished; or initiate an RRC reestablishment request by using an LTE RRC reestablishment request message.

The terminal in this embodiment of this disclosure further includes:
a configuration module, configured to control a radio link control (RLC) layer to use a default configuration of a corresponding standard, and reconfigure the RLC layer, a media access control (MAC) layer, and a physical (PHY) layer of the terminal by using air interface resource configuration signaling.

The terminal in this embodiment of this disclosure further includes:
a second sending module, configured to send a radio link failure report to the network device, where the radio link failure report carries CGI information, and the CGI information includes a PLMN identity.

The terminal in this embodiment of this disclosure sends the CGI information in the following manners, including:.

In the terminal in this embodiment of this disclosure, the primary PLMN is a first one in the PLMN list of the LTE core network; or.

An embodiment of this disclosure further provides a terminal, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the computer program is executed by the processor, each process in the embodiment of the bearer configuration method for RRC connection reestablishment that is applied to a terminal is implemented, and a same technical effect can be achieved. To avoid repetition, details are not described again herein.

An embodiment of this disclosure further provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program. When the computer program is executed by a processor, each process in the embodiment of the bearer configuration method for RRC connection reestablishment that is applied to a terminal is implemented, and a same technical effect can be achieved. To avoid repetition, details are not described again herein. The computer-readable storage medium is, for example, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk, or an optical disc.

For better achieving the foregoing objective, as shown in <FIG>, an embodiment of this disclosure further provides a terminal, including a memory <NUM>, a processor <NUM>, a transceiver <NUM>, a user interface <NUM>, a bus interface, and a computer program stored in the memory <NUM> and capable of running on the processor <NUM>, where the processor <NUM> is configured to read the program in the memory <NUM> to perform the following process:.

In <FIG>, a bus architecture may include any quantity of interconnect buses and bridges, specifically for interconnecting various circuits of one or more processors represented by the processor <NUM> and a memory represented by the memory <NUM>. The bus architecture may further interconnect various other circuits such as a peripheral device, a voltage regulator, and a power management circuit. These are all well known in the art, and therefore are not further described in this specification. The bus interface provides an interface. The transceiver <NUM> may be a plurality of components, that is, the transceiver <NUM> includes a transmitter and a receiver, and provides a unit for communicating with various other apparatuses on a transmission medium. For different user equipment, the user interface <NUM> may also be an interface for externally or internally connecting a required device, and the connected device includes but is not limited to a mini keyboard, a display, a speaker, a microphone, a joystick, or the like.

The processor <NUM> is responsible for bus architecture management and general processing. The memory <NUM> may store data used when the processor <NUM> performs an operation.

By reading the program in the memory <NUM>, the processor <NUM> is further configured to perform the following:
determining that the PDCP type for performing the PDCP configuration for the SRB <NUM> for sending the RRC reestablishment complete message is the type-<NUM> PDCP.

By reading the program in the memory <NUM>, the processor <NUM> is further configured to perform the following:
determining, in a predefined manner, not being according to the invention as claimed, or when detecting that a PDCP type supported by a target access network is not the type-<NUM> PDCP, or when terminal access times out, that the PDCP type for performing the PDCP configuration for the SRB <NUM> for sending the RRC reestablishment complete message falls back to the type-<NUM> PDCP.

Optionally, by reading the program in the memory <NUM>, the processor <NUM> is further configured to perform the following:.

By reading the program in the memory <NUM>, the processor <NUM> is further configured to perform the following:
determining, in a predefined manner, not being according to the invention as claimed, or when detecting that a PDCP type supported by a target network to be accessed is the type-<NUM> PDCP, that the PDCP type for performing the PDCP configuration for the SRB1 for sending the RRC reestablishment complete message is the type-<NUM> PDCP.

Optionally, by reading the program in the memory <NUM>, the processor <NUM> is further configured to perform the following:
using a default configuration of a corresponding standard for an RLC layer, and reconfiguring the RLC layer, an MAC layer, and a PHY layer of the terminal by using air interface resource configuration signaling.

Optionally, by reading the program in the memory <NUM>, the processor <NUM> is further configured to perform the following:
sending a radio link failure report to the network device, where the radio link failure report carries CGI information, and the CGI information includes a PLMN identity.

Optionally, a manner of sending the CGI information includes:.

Optionally, the primary PLMN may be a first one in the PLMN list of the LTE core network; or.

<FIG> is a schematic diagram of a hardware structure of a terminal for implementing each embodiment of this disclosure. The terminal <NUM> includes but is not limited to components such as a radio frequency unit <NUM>, a network module <NUM>, an audio output unit <NUM>, an input unit <NUM>, a sensor <NUM>, a display unit <NUM>, a user input unit <NUM>, an interface unit <NUM>, a memory <NUM>, a processor <NUM>, and a power supply <NUM>. A person skilled in the art may understand that the structure of the terminal shown in <FIG> does not constitute a limitation on the terminal. A quantity of components included in the terminal may be greater or less than that shown in the figure, or some components are combined, or component arrangements are different. In this embodiment of this disclosure, the terminal includes but is not limited to a mobile phone, a tablet computer, a notebook computer, a palmtop computer, an in-vehicle terminal, a wearable device, a pedometer, or the like.

The processor <NUM> is configured to: determine a PDCP type for performing PDCP configuration for an SRB <NUM> when an RRC reestablishment complete message is sent, where the PDCP type includes type-<NUM> PDCP supporting a first network or type-<NUM> PDCP supporting a second network; and send the RRC reestablishment complete message to a network device based on the PDCP type for performing the PDCP configuration.

In the technical solution of this embodiment of this disclosure, the terminal determines the PDCP type for performing the PDCP configuration for the SRB <NUM> for sending the RRC reestablishment complete message; and the terminal sends the RRC reestablishment complete message to the network device based on the PDCP type for performing the PDCP configuration, so that the terminal can determine the PDCP type used by the SRB1 in an RRC reestablishment process.

It should be understood that in this embodiment of this disclosure, the radio frequency unit <NUM> may be configured to receive and send signals in an information reception or transmission or call process. Specifically, after receiving downlink data from the network device, the radio frequency unit <NUM> sends the downlink data to the processor <NUM> for processing, and in addition, sends uplink data to the network device. Generally, the radio frequency unit <NUM> includes but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit <NUM> may further communicate with a network and another device through a wireless communications system.

The terminal provides wireless broadband Internet access for a user by using the network module <NUM>, for example, helps the user send and receive e-mails, browse web pages, and access streaming media.

The audio output unit <NUM> may convert audio data received by the radio frequency unit <NUM> or the network module <NUM> or stored in the memory <NUM> into an audio signal and output the audio signal as a sound. In addition, the audio output unit <NUM> may further provide an audio output (for example, a call signal reception sound or a message reception sound) related to a specific function performed by the terminal <NUM>. The audio output unit <NUM> includes a speaker, a buzzer, a telephone receiver, and the like.

The input unit <NUM> is configured to receive an audio or video signal. The input unit <NUM> may include a graphics processing unit (Graphics Processing Unit, GPU) <NUM> and a microphone <NUM>. The graphics processing unit <NUM> processes image data of a still picture or a video obtained by an image capture apparatus (for example, a camera) in an image capture mode or a video capture mode. A processed image frame may be displayed on the display unit <NUM>. An image frame processed by the graphics processing unit <NUM> may be stored in the memory <NUM> (or another storage medium) or sent by the radio frequency unit <NUM> or the network module <NUM>. The microphone <NUM> can receive a sound and can process the sound into audio data. The processed audio data may be converted in a telephone call mode into a format that can be sent by the radio frequency unit <NUM> to a mobile communications network device, for outputting.

The terminal <NUM> further includes at least one sensor <NUM>, for example, a light sensor, a motion sensor, and another sensor. Specifically, the light sensor includes an ambient light sensor and a proximity sensor. The ambient light sensor may adjust luminance of a display panel <NUM> based on brightness of ambient light. The proximity sensor may turn off and/or backlight the display panel <NUM> when the terminal <NUM> moves to an ear. As a type of motion sensor, an accelerometer sensor may detect acceleration magnitudes in all directions (generally three axes), and when the accelerometer sensor is stationary, may detect a magnitude and a direction of gravity, and may be configured to recognize a posture of the terminal (such as switching between landscape and portrait, related games, and magnetometer posture calibration), implement vibration recognition related functions (such as a pedometer and stroke), and the like. The sensor <NUM> may further include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, and the like.

The user input unit <NUM> may be configured to receive input digit or character information, and generate a key signal input related to a user setting and function control of the terminal. Specifically, the user input unit <NUM> includes a touch panel <NUM> and other input devices <NUM>. The touch panel <NUM>, also referred to as a touchscreen, may capture a touch operation performed by the user on or near the touch panel (for example, an operation performed by the user on the touch panel <NUM> or near the touch panel <NUM> by using any appropriate object or accessory such as a finger or a stylus). The touch panel <NUM> may include two parts: a touch detection apparatus and a touch controller. The touch detection apparatus detects a touch direction of the user, detects a signal carried by a touch operation, and transmits the signal to the touch controller. The touch controller receives touch information from the touch detection apparatus, converts the touch information into point coordinates, sends the point coordinates to the processor <NUM>, and receives and executes a command sent by the processor <NUM>. In addition, the touch panel <NUM> may be implemented in a plurality of forms, for example, a resistive, capacitive, infrared, or surface acoustic wave touch panel. The user input unit <NUM> may further include the other input devices <NUM> in addition to the touch panel <NUM>. Specifically, the other input devices <NUM> may include but are not limited to a physical keyboard, a function key (such as a volume control key or a power on/off key), a trackball, a mouse, a joystick, and the like.

Further, the touch panel <NUM> may cover the display panel <NUM>. After the touch panel <NUM> detects a touch operation on or near the touch panel, the touch panel <NUM> transmits the touch operation to the processor <NUM> to determine a type of a touch event. Then the processor <NUM> provides a corresponding visual output on the display panel <NUM> based on the type of the touch event. Although the touch panel <NUM> and the display panel <NUM> are used as two independent components to implement input and output functions of the terminal in <FIG>, the touch panel <NUM> and the display panel <NUM> may be integrated to implement the input and output functions of the terminal in some embodiments. This is not specifically limited herein.

The interface unit <NUM> is an interface for connecting an external apparatus to the terminal <NUM>. For example, the external apparatus may include a wired or wireless headphone port, an external power (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting an apparatus having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit <NUM> may be configured to receive an input (for example, data information or power) from an external apparatus, and transmit the received input to one or more components in the terminal <NUM>, or may be configured to transmit data between the terminal <NUM> and an external apparatus.

The memory <NUM> may be configured to store a software program and various data. The memory <NUM> may mainly include a program storage area and a data storage area. The program storage area may store an operating system, an application program required for at least one function (such as a sound play function and an image play function), and the like. The data storage area may store data created based on use of the mobile phone (such as audio data and a phone book), and the like. In addition, the memory <NUM> may include a high-speed random access memory, or may include a non-volatile memory, for example, at least one magnetic disk storage device, a flash memory, or other non-volatile solid-state storage devices.

The processor <NUM> is a control center of the terminal. The processor <NUM> uses various interfaces and lines to connect all parts of the entire terminal, and performs various functions and data processing of the terminal by running or executing the software program and/or module stored in the memory <NUM> and invoking data stored in the memory <NUM>, thereby performing overall monitoring on the terminal. The processor <NUM> may include one or more processing units. Optionally, the processor <NUM> may integrate an application processor and a modem processor. The application processor mainly processes the operating system, a user interface, an application program, and the like. The modem processor mainly processes wireless communication. It may be understood that the modem processor may alternatively not be integrated into the processor <NUM>.

The terminal <NUM> may further include the power supply <NUM> (such as a battery) supplying power to each component. Optionally, the power supply <NUM> may be logically connected to the processor <NUM> by using a power management system, so that functions such as charge and discharge management and power consumption management are implemented by using the power management system.

In addition, the terminal <NUM> includes some functional modules that are not illustrated.

As shown in <FIG>, an embodiment of this disclosure further provides a network device <NUM>, not being according to the invention as claimed, including:.

In the network device in this embodiment of this disclosure, the reconfiguration module is configured to: when it is detected that the terminal configures an SRB1 by using the type-<NUM> PDCP, and it is determined that the PDCP type supported by the target network to be accessed by the terminal is the type-<NUM> PDCP, reconfigure all bearers in an RRC reestablishment process by using the type-<NUM> PDCP; or
when it is detected that the terminal configures an SRB <NUM> by using the type-<NUM> PDCP, and it is determined that the PDCP type supported by the target network to be accessed by the terminal is not the type-<NUM> PDCP, reconfigure all bearers in an RRC reestablishment process by using the type-<NUM> PDCP.

In the network device in this embodiment of this disclosure, the reconfiguration module is configured to: reconfigure all the bearers in the RRC reestablishment process by using the type-<NUM> PDCP and reconfiguration signaling; or
after a preset message is transmitted or a predetermined condition is satisfied in the RRC reestablishment process, reconfigure all the bearers in the RRC reestablishment process by using the type-<NUM> PDCP.

The network device in this embodiment of this disclosure further includes:.

In the network device in this embodiment of this disclosure, the reconfiguration module is configured to: when it is detected that the terminal configures an SRB <NUM> by using the type-<NUM> PDCP, and it is determined that the PDCP type supported by the target network to be accessed by the terminal is the type-<NUM> PDCP, reserve original configurations of bearers in an RRC reestablishment process, or reconfigure all bearers in an RRC reestablishment process by using the type-<NUM> PDCP; or.

The network device in this embodiment of this disclosure further includes:
a second receiving module, configured to receive a radio link failure report sent by the terminal, where the radio link failure report carries CGI information, and the CGI information includes a PLMN identity.

An embodiment of this disclosure further provides a network device, not being according to the invention as claimed, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the computer program is executed by the processor, each process in the method embodiment of the bearer configuration method for RRC connection reestablishment that is applied to a network device is implemented, and a same technical effect can be achieved. To avoid repetition, details are not described again herein.

An embodiment of this disclosure further provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program. When the computer program is executed by a processor, each process in the embodiment of the bearer configuration method for RRC connection reestablishment that is applied to a network device is implemented, and a same technical effect can be achieved. To avoid repetition, details are not described again herein. The computer-readable storage medium is, for example, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk, or an optical disc.

As shown in <FIG>, an embodiment of this disclosure further provides a network device <NUM>, not being according to the invention as claimed, including a processor <NUM>, a transceiver <NUM>, a memory <NUM>, and a bus interface, where
the processor <NUM> is configured to read a program in the memory <NUM> to perform the following process:.

In <FIG>, a bus architecture may include any quantity of interconnect buses and bridges, specifically for interconnecting various circuits of one or more processors represented by the processor <NUM> and a memory represented by the memory <NUM>. The bus architecture may further interconnect various other circuits such as a peripheral device, a voltage regulator, and a power management circuit. These are all well known in the art, and therefore are not further described in this specification. The bus interface provides an interface. The transceiver <NUM> may be a plurality of components, that is, the transceiver <NUM> includes a transmitter and a receiver, and provides a unit for communicating with various other apparatuses on a transmission medium.

Optionally, by reading the program in the memory <NUM>, the processor <NUM> is further configured to perform the following:
receiving a radio link failure report sent by the terminal, where the radio link failure report carries CGI information, and the CGI information includes a PLMN identity.

It should be noted that the terms "include", "comprise", or any of their variants are intended to cover a non-exclusive inclusion, such that a process, a method, an article, or an apparatus that includes a list of elements not only includes those elements but also includes other elements that are not expressly listed, or further includes elements inherent to such process, method, article, or apparatus. In absence of more constraints, an element preceded by "includes a. " does not preclude existence of other identical elements in the process, method, article, or apparatus that includes the element.

Claim 1:
A bearer configuration method for radio resource control, RRC, connection reestablishment, wherein the RRC connection reestablishment comprises reestablishment from an eLTE network to an LTE network or NR network or eLTE network, and wherein the eLTE network refers to a <NUM> core network accessed via an LTE air interface, the method being performed by a terminal (<NUM>; <NUM>), being characterized by the method comprising:
determining (<NUM>) a Packet Data Convergence Protocol, PDCP, type for performing PDCP configuration for a signaling radio bearer1, SRB1, for sending an RRC reestablishment complete message, prior to sending the RRC reestablishment complete message, wherein the PDCP type comprises LTE PDCP supporting an LTE network or NR PDCP supporting an NR network or an eLTE network; and
sending (<NUM>) the RRC reestablishment complete message to a network device (<NUM>; <NUM>) based on the PDCP type for performing the PDCP configuration,
wherein the determining (<NUM>) the PDCP type for performing PDCP configuration for the SRB <NUM> for sending the RRC reestablishment complete message comprises:
determining, when the terminal (<NUM>; <NUM>) detecting that a PDCP type supported by a target access network is not the NR PDCP, or when the terminal (<NUM>; <NUM>) access times out, that the PDCP type for performing the PDCP configuration for the SRB1 for sending the RRC reestablishment complete message falls back to the LTE PDCP; or
determining, when the terminal (<NUM>; <NUM>) detecting that a PDCP type supported by a target network to be accessed is the NR PDCP, that the PDCP type for performing the PDCP configuration for the SRB <NUM> for sending the RRC reestablishment complete message is the NR PDCP.