CN113133073A - Network connection reestablishing method and device - Google Patents

Network connection reestablishing method and device Download PDF

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Publication number
CN113133073A
CN113133073A CN202110436810.1A CN202110436810A CN113133073A CN 113133073 A CN113133073 A CN 113133073A CN 202110436810 A CN202110436810 A CN 202110436810A CN 113133073 A CN113133073 A CN 113133073A
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cell
network
terminal
terminal device
rrc connection
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CN202110436810.1A
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CN113133073B (en
Inventor
赵文龙
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Honor Device Co Ltd
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Honor Device Co Ltd
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Priority to CN202110436810.1A priority Critical patent/CN113133073B/en
Publication of CN113133073A publication Critical patent/CN113133073A/en
Priority to PCT/CN2022/085942 priority patent/WO2022222774A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the application provides a network connection reestablishment method and a device thereof, wherein the method comprises the following steps: the terminal establishes communication connection with a first cell; when the network is disconnected, the terminal determines the reason of the network disconnection; when the reason is the first type of reason, the terminal requests to establish network connection again in the first cell, if the connection is successful, the terminal resides in the first cell, otherwise, the network connection is reestablished in the first cell for N times; when the reason is the second type of reason, the terminal reduces the priority of the first cell, searches other cells, requests to establish network connection to network equipment of the second cell if the terminal finds the second cell meeting the residence condition, and otherwise reestablishes the network connection in the first cell for M times; if the terminal establishes the network connection successfully in any one of the N times or the M times, the terminal resides in the first cell and stops executing the step of rebuilding. Therefore, an adaptive reconstruction mode can be selected according to different reasons of disconnection of the terminal network, and the reconstruction success rate is improved.

Description

Network connection reestablishing method and device
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for reestablishing a network connection.
Background
The terminal device can access the network through a base station and other devices to realize communication with other devices. Specifically, the terminal device may access a serving cell (hereinafter referred to as a cell) of a certain base station, and implement communication with other devices in the cell.
When the terminal device communicates in the cell, the terminal device may be affected by environment and network factors, and is disconnected from the cell and needs to initiate connection reestablishment. Based on the design of the 3rd generation partnership project (3 GPP) protocol, when initiating connection reestablishment, a terminal device selects a cell with a better signal and initiates connection reestablishment to the cell with the better signal.
However, in the above implementation, a phenomenon that the terminal device cannot successfully reestablish the connection for a long time often occurs, which affects communication of the terminal device.
Disclosure of Invention
The embodiment of the application provides a network connection reestablishment method and a network connection reestablishment device, which can select an adaptive reestablishment cell and a reestablishment mode for a terminal device aiming at different reasons when the terminal device is disconnected from a network, and improve reestablishment power.
In a first aspect, an embodiment of the present application provides a network connection reestablishment method, including: the terminal equipment establishes communication connection with a first cell; when the terminal equipment is disconnected with the first cell network, the terminal equipment determines the reason of the network disconnection; when the terminal equipment determines that the reason is the first type of reason, the terminal equipment requests to establish network connection again in a first cell, and the first cell is a cell accessed when the network of the terminal equipment is disconnected; when the network connection is reestablished successfully in the first cell by the terminal equipment, the terminal equipment is resided in the first cell; or when the network connection reestablishment of the terminal equipment in the first cell fails, the terminal equipment continues to reestablish the network connection in the first cell for N times, wherein N is an integer; in the N times of network connection reestablishment, if the terminal equipment succeeds in network connection reestablishment at any time, the terminal equipment is resided in the first cell, and the step of network connection reestablishment is stopped; the first kind of reasons include handover failure or maximum number of uplink radio link layer control protocol RLC retransmissions; or when the terminal device determines that the reason is the second type of reason, the terminal device reduces the priority of the first cell, searches for other cells to reestablish network connection, and when the terminal device finds a second cell meeting the residence condition in the other cells, the terminal device requests the network device corresponding to the second cell to establish network connection; or when the terminal device does not find a cell meeting the residence condition in other cells, the terminal device continues to reestablish network connection in the first cell for M times, where M is an integer; in the M times of network connection reestablishment, if the terminal equipment succeeds in network connection reestablishment at any time, the terminal equipment is resided in the first cell, and the step of network connection reestablishment is stopped; the other cells do not include the first cell, and the second type of reasons includes reconfiguration failure, integrity check failure, random access problems, or terminal out-of-synchronization.
Based on this, the embodiment of the application can select the adaptive cell reconstruction and the adaptive mode reconstruction for the terminal device according to different reasons when the terminal device disconnects the network connection, so that the process of reestablishing the network connection by the terminal device can be accelerated in a targeted manner, and the reestablishment power is improved.
In one possible implementation, the determining, by the terminal device, the reason for the network disconnection includes: the terminal equipment receives a radio resource control Connection reconfiguration message RRC Connection Re-configuration from network equipment corresponding to the first cell, wherein the RRC Connection Re-configuration carries a reason value, and the reason value is used for indicating the reason of network disconnection. In this way, different cause values causing network disconnection may be determined by the network device corresponding to the first cell, so that the terminal device determines the different cause values by receiving a radio resource control connection reconfiguration message from the network device.
In one possible implementation, the cause value includes a reconfiguration failure cause value or a handover failure cause value. Therefore, the terminal equipment can select the reconstruction cell and the reconstruction mode in a targeted manner according to different clear cause values.
In one possible implementation, the determining, by the terminal device, the reason for the network disconnection includes: the terminal equipment determines the reason of network disconnection according to the local data of the terminal equipment; the reason for the network disconnection determined according to the local data of the terminal equipment comprises the following steps: RLC retransmissions reach a maximum number of times, integrity check fails, random access problems or terminal loss of synchronization. Therefore, the terminal equipment can determine the reason of network disconnection according to the terminal equipment and select the reestablished cell and the reestablishing mode in a targeted manner.
In one possible implementation, the requesting, by the terminal device, the network connection to be established again in the first cell includes: and the terminal equipment sends an RRC Connection reestablishment Request RRC Connection Re-establishment Request to the network equipment corresponding to the first cell. In this way, the terminal device may establish a network connection with the network device corresponding to the first cell by sending an RRC connection reestablishment request to the network device corresponding to the first cell.
In one possible implementation, the successfully reestablishing, by the terminal device, the network connection in the first cell includes: the terminal equipment receives an RRC Connection reestablishment completion command RRC Connection Re-establishment Complete from the network equipment corresponding to the first cell; the terminal equipment reestablishes the network connection failure in the first cell and comprises the following steps: the terminal equipment receives an RRC Connection reestablishment rejection command RRC Connection Re-establishment Reject subject from the network equipment corresponding to the first cell. In this way, the terminal device may determine whether to reestablish the network connection with the first cell successfully by receiving different commands of the network device corresponding to the first cell.
In one possible implementation manner, after the terminal device continues to reestablish the network connection for N times in the first cell, the method further includes: the terminal equipment receives an RRC Connection Release message RRC Connection Release from network equipment corresponding to the first cell; the terminal equipment releases RRC connection; and the terminal equipment does not select the first cell for residing in the preset time period. Therefore, the terminal equipment can select not to reside in the first cell within a certain time by releasing the RRC connection, and the time and resources for establishing the network connection in the first cell are reduced.
In one possible implementation, the terminal device switches to a network of a communication system lower than the first cell. Therefore, if the terminal device does not find a suitable cell residence, the terminal device can establish network connection by switching the communication system through the network, so that the terminal device can be accessed to the network as much as possible.
In one possible implementation, the method for reducing the priority of the first cell by the terminal device includes: the terminal equipment adds an identifier for the first cell, wherein the identifier is used for indicating that the priority of the first cell is low. Therefore, the terminal equipment can reduce the priority of the first cell by adding the identifier, so that the terminal equipment can not initiate reconstruction in the first cell firstly by identifying the priority of the cell, and the probability of success of reconstruction can be improved.
In a second aspect, an embodiment of the present application provides an apparatus for network connection reestablishment, including a memory, a processor, and a communication unit, where the memory is used for storing instructions; a communication unit, configured to establish a communication connection with a first cell; the processor is used for determining the reason of network disconnection when the terminal equipment is disconnected with the first cell network; when the terminal device determines that the reason is the first type of reason, the communication unit is further configured to request for establishing network connection again in a first cell, where the first cell is a cell accessed when the network of the terminal device is disconnected; the processor is further configured to reside in the first cell when the terminal device succeeds in reestablishing the network connection in the first cell; or, when the terminal device fails to reestablish the network connection in the first cell, the communication unit is further configured to continue to reestablish the network connection in the first cell N times, where N is an integer; wherein, in the N times of network connection reestablishment, if the terminal device succeeds in any network connection reestablishment, the processor is further configured to camp in the first cell and stop executing the step of network connection reestablishment; the first kind of reasons include handover failure or maximum number of uplink radio link layer control protocol RLC retransmissions; or, when the terminal device determines that the reason is the second type of reason, the processor is further configured to reduce the priority of the first cell, and the processor is further configured to search for other cells to reestablish network connection, and when the terminal device finds a second cell that meets the residence condition in the other cells, the communication unit is further configured to request the network device corresponding to the second cell to establish network connection; or, when the terminal device does not find a cell satisfying the camping condition in another cell, the communication unit is further configured to continue to reestablish the network connection in the first cell for M times, where M is an integer; wherein, in the M times of network connection reestablishment, if the terminal device succeeds in any network connection reestablishment, the processor is further configured to camp in the first cell and stop executing the step of network connection reestablishment; the other cells do not include the first cell, and the second type of reasons includes reconfiguration failure, integrity check failure, random access problems, or terminal out-of-synchronization.
In a possible implementation manner, the communication unit is specifically configured to receive a radio resource control Connection reconfiguration message RRC Connection Re-configuration from a network device corresponding to the first cell, where the RRC Connection reconfiguration message RRC Connection Re-configuration carries a cause value, and the cause value is used to indicate a cause of network disconnection.
In one possible implementation, the cause value includes a reconfiguration failure cause value or a handover failure cause value.
In one possible implementation, the processor is specifically configured to determine a cause of a network disconnection according to local data of the terminal device; the reason for the network disconnection determined according to the local data of the terminal equipment comprises the following steps: RLC retransmissions reach a maximum number of times, integrity check fails, random access problems or terminal loss of synchronization.
In a possible implementation manner, the communication unit is specifically further configured to send an RRC Connection Re-establishment Request to the network device corresponding to the first cell.
In a possible implementation manner, the communication unit is specifically further configured to receive an RRC Connection Re-establishment Complete command RRC Connection Re-establishment Complete from the network device corresponding to the first cell; the communication unit is specifically configured to receive an RRC Connection reestablishment rejection command RRC Connection Re-assignment Reject from the network device corresponding to the first cell.
In a possible implementation manner, the communication unit is specifically further configured to receive an RRC Connection Release message RRC Connection Release from a network device corresponding to the first cell; a communication unit, specifically configured to release the RRC connection; the processor is specifically further configured to not select the first cell for camping within a preset time period.
In one possible implementation, the processor is further specifically configured to switch to a network of a communication system lower than the first cell.
In a possible implementation manner, the processor is specifically further configured to add an identifier to the first cell, where the identifier is used to indicate that the priority of the first cell is low.
In a third aspect, an embodiment of the present application provides an electronic device, including: one or more processors, transceivers, memories, and interface circuits; the one or more processors, transceivers, memories, and interface circuits communicate over one or more communication buses; the interface circuit is for communicating with other apparatus, the one or more computer programs being stored in the memory and configured for execution by the one or more processors or transceivers to cause the electronic device to perform the method as set forth in the first aspect or any one of the possible designs of the first aspect.
In a fourth aspect, an embodiment of the present application provides a chip, where the chip is coupled to a memory in an electronic device, and is configured to call a computer program stored in the memory and execute a technical solution of any one of the first aspect and any possible design of the first aspect of the embodiment of the present application; "coupled" in the context of this application means that two elements are joined to each other either directly or indirectly.
In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, where the computer-readable storage medium includes a computer program, and when the computer program runs on an electronic device, the electronic device is caused to perform any one of the technical solutions as set forth in the first aspect and any possible design of the first aspect.
A sixth aspect is a computer program product according to an embodiment of the present application, where the computer program product includes instructions that, when executed on a computer, cause the computer to perform any one of the technical solutions as described in the first aspect and any possible design thereof.
For the beneficial effects of the second aspect to the sixth aspect, please refer to the beneficial effects of the first aspect, which is not repeated herein.
Drawings
Fig. 1 is a schematic view of an application scenario in which a terminal communicates with a base station;
FIG. 2 is a schematic diagram illustrating a cell selection protocol in a 3GPP protocol;
fig. 3 is a schematic diagram illustrating a cell selection protocol according to an embodiment of the present application;
FIG. 4 is a schematic flow chart of a reconstruction process when executing the protocol of FIG. 2;
FIG. 5 is a schematic flow chart of reconstruction according to an embodiment of the present application;
FIG. 6 is a schematic flow chart of reconstruction according to an embodiment of the present application;
FIG. 7 is a schematic flow chart of reconstruction according to an embodiment of the present application;
FIG. 8 is a schematic flow chart of reconstruction according to an embodiment of the present application;
FIG. 9 is a schematic flow chart of reconstruction according to an embodiment of the present application;
FIG. 10 is a schematic flow chart of a reconstruction according to an embodiment of the present application;
fig. 11 is a schematic structural diagram of a network connection reestablishment apparatus according to an embodiment of the present application;
fig. 12 is a schematic hardware structure diagram of a network connection reestablishment apparatus according to an embodiment of the present application.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings. In the description of the embodiments herein, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.
It is noted that, in the present application, words such as "exemplary" or "for example" are used to mean exemplary, illustrative, or descriptive. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
It should be noted that "at … …" in the embodiment of the present application may be at the instant of a certain condition, or may be within a certain period of time after a certain condition occurs, and the embodiment of the present application is not particularly limited to this.
The network connection reestablishment method and the device thereof provided by the embodiment of the application can be applied to various communication systems, for example: a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, a Universal Mobile Telecommunications System (UMTS), a fifth generation (5G) system or a New Radio (NR), another evolved communication system or a future communication system, and the like.
The terminal device in the embodiment of the present application may also be referred to as: user Equipment (UE), Mobile Station (MS), Mobile Terminal (MT), access terminal, subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device, etc.
The terminal device may be a device providing voice/data connectivity to a user, e.g. a handheld device, a vehicle mounted device, etc. with wireless connection capability. Currently, some examples of terminals are: a mobile phone (mobile phone), a tablet computer, a notebook computer, a palm computer, a Mobile Internet Device (MID), a wearable device, a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote operation (remote local supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in city (city), a wireless terminal in smart home (smart home), a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (wireless local) phone, a personal digital assistant (WLL) station, a handheld personal communication device with wireless communication function, a wireless terminal in industrial control (industrial control), a wireless terminal in transportation security (personal control), a wireless terminal in city (smart home), a wireless terminal in smart home (smart home), a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (personal digital assistant (PDA) phone, a wireless local communication device with wireless communication function, a wireless communication device, a communication device, A computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a Public Land Mobile Network (PLMN) for future evolution, and the like, which are not limited in this embodiment of the present application.
By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearable intelligent equipment, is the general term of applying wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets for physical sign monitoring, smart jewelry and the like.
In addition, in the embodiment of the present application, the terminal device may also be a terminal device in an internet of things (IoT) system, where IoT is an important component of future information technology development, and a main technical feature of the present application is to connect an article with a network through a communication technology, so as to implement an intelligent network with interconnected human-computer and interconnected objects.
It will be appreciated that the terminal device may be mobile or fixed.
In addition, the network device in this embodiment may be a Transmission Reception Point (TRP), an evolved NodeB (eNB or eNodeB) in an LTE system, a home NodeB (home NodeB, home Node B, HNB), a baseband unit (BBU), or a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or the access network device may be a relay station, an access point, a vehicle-mounted device, a wearable device, an access network device in a 5G network, or an access network device in a Public Land Mobile Network (PLMN) network for future evolution, etc., may be an Access Point (AP) in the WLAN, and may be a gNB in a New Radio (NR) system, which is not limited in this embodiment of the present application. In one network configuration, the access network device may include a Centralized Unit (CU) node, or a Distributed Unit (DU) node, or a RAN device including a CU node and a DU node, or a control plane CU node (CU-CP node) and a user plane CU node (CU-UP node), and a RAN device of a DU node.
It will be appreciated that each network device may provide communication coverage for a particular geographic area and may communicate with terminal devices (UEs) located within that coverage area (cell).
In the embodiment of the present application, the terminal device or each network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a Central Processing Unit (CPU), a Memory Management Unit (MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processing through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address list, word processing software, instant messaging software and the like. Furthermore, the embodiment of the present application does not particularly limit the specific structure of the execution subject of the method provided by the embodiment of the present application, as long as the program recorded with the code of the method provided by the embodiment of the present application can be executed to perform communication according to the method provided by the embodiment of the present application, for example, the execution subject of the method provided by the embodiment of the present application may be a network device, or a functional module capable of calling a program and executing the program in the network device.
Additionally, various aspects or features of embodiments of the application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used in the embodiments of this application is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disk, floppy disk, or magnetic tape), optical disks (e.g., Compact Disk (CD), Digital Versatile Disk (DVD), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROM), card, stick, or key drive, etc.). In addition, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.
Exemplarily, taking a network device as a base station as an example, fig. 1 shows a schematic view of an application scenario of communication between a terminal and a base station according to an embodiment of the present application.
As shown in fig. 1, one base station may cover one or more cells. For example, in fig. 1, base station 1 may cover cell 1, cell 2, and cell 3, base station 2 may cover cell 5, cell 8, and cell 9, and base station 3 may cover cell 4, cell 6, and cell 7.
It is understood that fig. 1 is only an example, and in a possible implementation manner, there may also be a base station that covers one cell among the base stations 1 to 3, and there may also be an overlap of cells covered by the base stations 1 to 3, and the embodiment of the present application is not limited.
Taking UE1 as an example, after UE1 is powered on or accesses the network, the network connection of base station 1 corresponding to cell 1 may be established based on protocol rules, and in cell 1, in the communication process of UE1 based on cell 1, the network connection between UE1 and cell 1 may be disconnected due to the network condition becoming worse or UE1 moving from cell 1 to another cell, and the like, and then UE1 may reinitiate the network connection establishment with the cell based on certain rules, which may also be referred to as reestablishment. The cell selected by the UE1 during the reestablishment may be cell 1, or may be another cell other than cell 1, which may specifically be according to an actual rule.
For example, in a possible implementation manner, when the terminal initiates the re-establishment process, the terminal may perform a procedure of selecting a cell in the 3GPP protocol as shown in fig. 2.
As shown in fig. 2, the process of selecting a cell in the 3GPP protocol may be sequentially divided into three steps: 1. a cell selection procedure based on a priori information. 2. An initial cell selection procedure. 3. Any cell selection procedure. The three steps are described below:
1. a cell selection procedure based on a priori information. The prior information may be cell information stored in a Public Land Mobile Network (PLMN), such as a frequency point, a physical cell ID, and the like, and may be used to accelerate cell selection.
The cell selection procedure based on the prior information may be: when the terminal is reestablished, if the terminal has PLMN stored cell information, the terminal searches for a cell in the cell information stored in the PLMN, if a suitable cell is found, the terminal may stay in the suitable cell, and if the terminal cannot find the suitable cell, the terminal may enter step 2 to perform the initial cell selection process.
2. An initial cell selection procedure. The initial cell may refer to a cell within a predetermined frequency range in the terminal. The terminal may search for a cell in the initial cell, and if the terminal finds a suitable cell, the terminal may stay in the suitable cell, and if the terminal cannot find the suitable cell, the terminal may enter step 3 to perform an arbitrary cell selection procedure.
Or, after the terminal selects a suitable cell to normally camp on, the non-access stratum (NAS) indication message indicates that registration of the terminal on the selected PLMN is rejected, and then the terminal may enter step 3 to perform an arbitrary cell selection procedure.
3. Any cell selection procedure. The arbitrary cell may be a cell without a limited frequency range, and the arbitrary cell may include the initial cell or may not include the initial cell.
When the terminal performs any cell selection, if an acceptable cell is found, the terminal may camp on the acceptable cell, if an acceptable cell is not found, the terminal may find an acceptable cell in the cell when leaving the connected mode, and if found, the terminal may camp on the acceptable cell.
It should be noted that, if there is no Universal Subscriber Identity Module (USIM) in the terminal, the terminal may also skip step 1 and step 2 and perform step 3.
In step 1 or step 2, after the terminal selects a suitable cell for normal camping, if the terminal leaves the idle mode and enters the connected mode, the terminal may search for the cell leaving the connected mode, and if the terminal cannot find the suitable cell, step 1 may be executed again.
Or, after the terminal selects the appropriate cell to normally camp on, the terminal may also trigger a cell reselection evaluation process, where in the cell reselection evaluation process, if the terminal finds the appropriate cell, the terminal normally camps on the appropriate cell, and if the terminal cannot find the appropriate cell, the terminal may execute step 3.
In step 3, after the terminal selects any suitable cell to camp on normally, if the terminal leaves the idle mode and enters the connected mode, the terminal may search for a cell leaving the connected mode, and if no suitable cell is found, step 3 may be executed again.
Or, after the terminal selects any suitable cell to normally camp on, the terminal may also trigger a cell reselection evaluation process, where in the cell reselection evaluation process, if the terminal finds a suitable cell, the terminal normally camps on the suitable cell, and if the terminal cannot find the suitable cell, the terminal may execute step 3.
In a possible implementation manner, in the embodiment corresponding to fig. 2, in any implementation of searching for a suitable cell in steps 1 to 3, the selection is performed based on a network selection principle of the cell.
For example, the network selection principle of the cell is as follows: srelevIf the cell meets the condition, the terminal confirms that the cell is a proper cell.
Wherein S isrelev＝Qrxlevmeas-(Qrxlev min+Qrxlev min offset)-Pcompensation
In the above formula, QrxlevmeasRepresents the Reference Signal Receiving Power (RSRP) of the received signal, which refers to the value of the received reference signal power, Qrxlev minRepresenting the minimum power value, Q, of the received signalrxlev min offsetIndicating Q when residing in a Visited PLMN (VPLMN) periodically selecting a high priority PLMNrxlev minOffset of (2), PcompensationThe value is max (P)EMAX PUMAX0), wherein PEMAXRepresents the maximum transmission power level, P, of the terminal in uplink transmissionUMAXRepresenting the maximum rf output power of the terminal.
That is, if the terminal performs the reestablishment by using the flow as shown in fig. 2, no matter what reason the terminal initiates the reestablishment due to the reconfiguration failure, the handover failure, the mobility failure, the integrity check failure, or the radio link failure, the terminal may select the cell with the best signal quality by using the cell selection process when finding the suitable cell.
However, in some scenarios, the terminal cannot establish a network connection in the cell a, the signal quality of the cell a is not good, and even the signal quality of the cell a may be best, but the parameter sent by the cell a to the terminal cannot be correctly analyzed or processed by the terminal, which results in that the terminal cannot establish a network connection in the cell, the cell selection is performed according to the process corresponding to fig. 2, the terminal always selects the cell a, which cannot establish a network connection successfully, the success rate of reestablishment is low, and network use of the terminal is affected.
In view of this, the embodiment of the present application provides a network connection reestablishment method, which may select an adaptive cell reestablishment and reestablishment mode for a terminal according to different reasons when the terminal disconnects from a network, so that a terminal reconnection network selection process may be accelerated in a targeted manner, and reestablishment power may be improved.
For example, if the network connection is disconnected due to a handover failure or a reason that the number of times of retransmission of an uplink radio link control protocol (RLC) reaches the maximum number, the terminal preferentially initiates reestablishment in an original cell when the network connection is disconnected, and the network connection can be successfully established with a high probability. This is because the reason for the handover failure or the maximum number of uplink RLC retransmissions may be that some interfaces of the terminal have problems, or that the protocol is abnormal, instead of the problem of the original cell, and the network connection is initiated again in the original cell, which not only can improve the probability of successful re-establishment, but also does not need to perform the cell selection process corresponding to fig. 2, thereby greatly improving the re-establishment efficiency.
For example, if the terminal disconnects the network due to reconfiguration failure, integrity check failure, random access problem, or UE out-of-synchronization, the terminal lowers the priority of the original cell when the network is disconnected, and searches for other suitable cells to initiate re-establishment, so as to improve the probability of success of re-establishment. This is because the reason for the reconfiguration failure, the integrity check failure, the random access problem, or the UE out-of-step may be a parameter sent to the terminal by the original cell, and the terminal cannot correctly analyze or process the parameter, so that the terminal cannot establish a network connection in the original cell.
For example, fig. 3 shows a schematic flowchart of a cell selection protocol according to an embodiment of the present application, as shown in fig. 3, if a network connection between a terminal and an original cell is disconnected, the terminal may perform reestablishment by using a first method or a second method first based on a cause value when the network is disconnected, and if the network connection cannot be successfully established by using the first method or the second method, a reestablishment flow 300 may be further performed to perform reestablishment.
It should be noted that the reconstruction process 300 is similar to the reconstruction process described in fig. 2, and is different from the reconstruction process in fig. 2, that when the reconstruction process 300 in fig. 3 is used for reconstructing, an original cell is not selected when a cell is selected within a certain time period, or it can be understood that if a network connection cannot be successfully established in a first mode or a second mode, in this embodiment, the original cell does not reside in the original cell during a time period T, because if the network connection cannot be successfully established in the first mode or the second mode, it indicates that the original cell may not be able to establish a network connection with a terminal in the near future, and when the cell is selected in a subsequent time period T, the original cell is not selected, which can avoid interference of the original cell on cell selection, and improve the reconstruction efficiency.
The following describes the first and second modes. For example, the network disconnection reason value corresponding to the first mode may include reconfiguration failure, integrity check failure, random access problem, or UE out-of-synchronization, and the network disconnection reason value corresponding to the second mode may include handover failure or maximum number of uplink RLC retransmissions.
The first method is as follows: the terminal reduces the priority of the original cell, searches for other cells meeting the residence condition, if the terminal finds other suitable cells, the terminal can stay in the other suitable cells, if the terminal cannot find the suitable cells, the terminal can initiate reconstruction in the original cell, if the terminal is successfully reconstructed in the original cell, the terminal can stay in the original cell, if the terminal is unsuccessfully reconstructed in the original cell, the terminal can continue to reconstruct in the original cell for N times, wherein N is an integer, and in the N times of reconstruction, if the terminal is successfully reconstructed in any time, the terminal can stay in the original cell and does not perform reconstruction. If the terminal fails to reestablish the original cell N times, the terminal may release Radio Resource Control (RRC) connection, perform subsequent procedures similar to those in fig. 2 for reestablishment, and when the terminal performs cell selection within a certain time period, the terminal does not select the original cell.
The second method comprises the following steps: the terminal raises the priority of the original cell, initiates reconstruction in the original cell, normally resides in the original cell if the terminal is successfully reconstructed in the original cell, continues to be reconstructed in the original cell for N times if the terminal is failed to be reconstructed in the original cell, wherein N is an integer, and in the N times of reconstruction, if the terminal is successfully reconstructed in any time, the terminal can stay in the original cell and does not perform reconstruction any more. If the terminal fails to reestablish the original cell N times, the terminal may release the RRC connection, perform a subsequent procedure similar to that shown in fig. 2 for reestablishment, and when the terminal performs cell selection within a certain time period, the terminal does not select the original cell.
For a clearer explanation of the embodiment of the present application, two possible reconstruction flows are compared with fig. 4 and fig. 5, where fig. 4 is a schematic flow chart of reconstruction when the protocol of fig. 2 is executed, and fig. 5 is a schematic flow chart of reconstruction when the protocol of fig. 3 is executed.
As shown in fig. 4, the flow of the reconstruction when the terminal executes the protocol of fig. 2 (described later with 36304 protocol) includes:
s401, the terminal device sends an RRC connection request to the network device corresponding to the first cell according to 36304 protocol.
The 36304 protocol refers to the cell selection protocol shown in fig. 2, and the terminal device may select the first cell as the suitable cell based on the 36304 protocol, and the specific process may refer to the description of fig. 2 and is not described herein again.
The terminal device sends an RRC connection request to the network device corresponding to the first cell.
S402, the terminal device is successfully connected with the network device RRC corresponding to the first cell.
If the RRC connection between the terminal device and the network device corresponding to the first cell is successfully established, the terminal device may implement communication with other devices in the first cell.
S403, the network device corresponding to the first cell sends an RRC connection reconfiguration message to the terminal device, where the RRC connection reconfiguration message carries the cause value.
The terminal device and the first cell may disconnect the network connection for various reasons, and then the network device corresponding to the first cell sends an RRC connection reconfiguration message to the terminal device, where the RRC connection reconfiguration message carries a cause value, for example, the cause value may be a reconfiguration failure, a handover failure, or a mobility failure.
Suitably, the terminal device may receive the RRC connection reconfiguration message.
S404, the terminal device determines the cell with the best quality as a first cell.
After receiving the RRC connection reconfiguration message, the terminal device does not pay attention to a specific cause value, but selects a cell with the best signal quality as a target reestablishment cell. For example, the target reconstructed cell is still the first cell.
S405, the terminal device sends an RRC Connection Re-establishment Request (RRC Connection Re-establishment Request) to the network device corresponding to the first cell.
The RRC connection reestablishment request is used to request the terminal device to reestablish the RRC connection with the network device corresponding to the first cell.
S406, the terminal equipment judges whether the RRC connection is successfully reestablished, if the RRC connection is successfully reestablished, S407 is executed, and if the RRC connection is not successfully reestablished, S408 is executed.
S407, the terminal device sends an RRC Connection Re-establishment Complete (RRC Connection Re-establishment Complete) message to the network device corresponding to the first cell, and the establishment procedure is completed.
The subsequent terminal device may enable communication with the other device in the first cell.
S408, if the reconstruction in the first cell fails, the terminal equipment continues to select the cell with the best signal quality as the target reconstruction cell. For example, the target reconstructed cell is still the first cell. The terminal device proceeds to S409.
S409, the terminal equipment sends an RRC connection reestablishment request to the network equipment corresponding to the first cell, and then S406-S408 are repeatedly executed.
As can be seen, in the reestablishment process corresponding to fig. 4, even if the terminal device fails to reestablish in the first cell, because the first cell is the cell with the best signal quality, the terminal device still continues to initiate reestablishment in the first cell and fails continuously, so that the reestablishment process corresponding to fig. 4 cannot timely and effectively establish network connection for the terminal device.
As shown in fig. 5, the flow of the reconstruction when the terminal executes the protocol (the improved protocol in the embodiment of the present application) in fig. 3 includes:
s501, the terminal device sends an RRC connection request to the network device corresponding to the first cell according to 36304.
S502, the terminal device is successfully connected with the network device RRC corresponding to the first cell.
S503, the network device corresponding to the first cell sends an RRC Connection reconfiguration message (RRC Connection Re-configuration) to the terminal device, where the message carries the cause value.
Specifically, the processes of S501-S503 are similar to those of S401-S403, and refer to the descriptions of S401-S403, which are not repeated herein.
It can be understood that, in the embodiment of the present application, the reconstruction methods corresponding to different cause values are different, and therefore, in the embodiment corresponding to fig. 5, the cause value is taken as an example for the reconfiguration failure, and other cause values and corresponding methods will be described in the following embodiments.
Wherein, the RRC connection reconfiguration message may also carry at least one of the following information: information of a serving cell (i.e., a first cell, or referred to as an original cell) where the terminal is located before the terminal is reestablished, for example, a cell radio network temporary identifier (C-RNTI) allocated to the terminal by the original cell, a Physical Cell Identifier (PCI) of the original cell, and the like.
The reconfiguration failure may be a failure when the terminal device establishes, modifies, or releases the radio bearer, or a failure when the terminal device establishes, modifies, or releases the measurement configuration, and the like.
The cause value for indicating the reconfiguration failure may be a number, a character string, or the like, and the embodiment of the present application is not particularly limited.
And S504, the terminal equipment reduces the priority of the original cell.
For example, the terminal device may add a first identifier to the original cell, where the first identifier is used to indicate that the priority of the original cell is low, and when the subsequent terminal device performs cell selection, the original cell may not be selected.
And S505, the terminal equipment searches for other cells meeting the residence conditions to obtain a second cell.
In a possible implementation manner, the terminal device searches for other cells of the Radio Access Technology (RAT) that satisfy the camping condition, where the RAT is used to connect the terminal device and the network device through a wireless medium and may be used to implement information transfer between the terminal device and the network.
In a possible implementation manner, the terminal device may find other cells meeting the camping condition, where the other cells may include a second cell, a third cell, and a fourth cell, where an RSRP value corresponding to the second cell is 90dBm, an RSRP value corresponding to the third cell is 80dBm, and an RSRP value corresponding to the fourth cell is 70dBm, and the terminal device may determine that the other cells of the RAT meeting the camping condition are the second cells by sorting the RSRP values corresponding to the three cells.
S506, the terminal device sends an RRC Connection Re-establishment Request (RRC Connection Re-establishment Request) to the network device corresponding to the second cell.
It should be noted that the network device corresponding to the second cell may be the same as the network device corresponding to the first cell (not shown in the figure), that is, the second cell and the first cell are located in the coverage of one network device.
The network device corresponding to the second cell may also be different from the network device corresponding to the first cell, that is, the second cell and the first cell are not in the coverage of one network device, which is not limited in the embodiment of the present application.
S507, the terminal device determines whether the RRC Connection is successfully reestablished, if the RRC Connection is successfully reestablished, S508 is executed, and if the RRC Connection is not successfully reestablished, for example, the terminal device receives an RRC Connection Re-establishment Reject command (RRC Connection Re-establishment Reject object) from the network device corresponding to the second cell, S509 is executed.
And S508, the terminal equipment completes RRC connection reestablishment with the network equipment corresponding to the second cell.
For example, the terminal device receives an RRC Connection reestablishment Complete command (RRC Connection Re-establishment Complete) from the network device corresponding to the second cell, and the reestablishment procedure is ended.
And S509, the terminal device and the network device corresponding to the first cell perform N times of reconstruction.
S510, the terminal device determines whether the reestablishment is successful, if the reestablishment is successful, S511 is executed, and if the reestablishment is not successful, for example, the terminal device receives an RRC Connection Re-establishment Reject request (RRC Connection Re-establishment Reject object) from the network device corresponding to the second cell, S512 is executed.
It should be noted that, in the N times of reestablishments, if the terminal device succeeds in any reestablishment, the terminal device may consider that the reestablishment is successful, normally resides in the first cell, and is not performing reestablishment. If the terminal fails to re-establish in the first cell N times, the terminal may release the RRC connection, and perform S512.
And S511, the terminal equipment completes RRC connection reestablishment with the network equipment corresponding to the first cell.
For example, the terminal device receives an RRC Connection reestablishment Complete command (RRC Connection Re-establishment Complete) from the network device corresponding to the first cell, and the reestablishment procedure is ended.
S512, if the terminal fails to reestablish the first cell for N times, the network device corresponding to the first cell sends an RRC Connection Release message (RRC Connection Release) to the terminal device.
The RRC connection release message may be used to instruct the terminal device to release the RRC connection and the corresponding radio resource. Correspondingly, the terminal equipment releases the RRC connection and corresponding radio resources after receiving the RRC connection release message.
And S513, the terminal equipment does not reside in the original cell within the time T1.
Specifically, the terminal device may establish a blacklist, add an original cell (first cell) that does not satisfy the terminal device residence condition to the blacklist, and within a certain time T1, may not select to reside in the original cell (first cell).
In a possible implementation manner, if the other target cell (e.g., the second cell) does not satisfy the terminal device camping condition, the terminal device prioritizes the other target cell, and also adds the other target cell to the blacklist, and within a certain time T1, the terminal device does not select to camp on the other target cell.
S514, the terminal device executes the reconstruction process 300.
The reconstruction process 300 can refer to the description of fig. 3, and is not described in detail herein. It should be noted that in the reestablishment flow 300, the first cell is not selected any more to initiate reestablishment in time T1.
In a possible implementation manner, the terminal device does not find other suitable cell residences based on the reestablishment process 300, and the terminal device may switch from the higher communication system to the lower communication system, for example, the terminal device switches from the 5G network to a fourth generation (4th generation, 4G) network or a third generation (3th generation, 3G) network, so that the terminal device may access the network as much as possible.
In summary, by comparing the reconstruction flows of fig. 4 and fig. 5, it can be found that in the reconstruction flow provided in the embodiment of the present application, the terminal device can perform adaptive cell priority selection through a specific cause value, and does not initiate reconstruction on the original cell repeatedly as in the implementation of fig. 4, so that reconstruction power and efficiency can be improved.
More specifically, the following compares cell selection lists in the reconstruction flow corresponding to fig. 4 and 5. Table 1 shows cell selection in the reconstruction process corresponding to fig. 4, and table 2 shows cell selection in the reconstruction process corresponding to fig. 5.
TABLE 1
Number of reconstructions First time reconstruction Second reconstruction 2+ N reconstructions 2+ N + m reconstructions
Selected cell First cell First cell First cell First cell
TABLE 2
Number of reconstructions First time reconstruction Second reconstruction 2+ N reconstructions 2+ N + m reconstructions
Selected cell First cell Second cell First cell Other cells
Therefore, in the reconstruction process provided in the embodiment of the present application, the terminal device may perform adaptive cell priority selection according to a specific cause value, and may not initiate reconstruction on the original cell repeatedly as in the implementation of fig. 4, so that reconstruction power and efficiency may be improved. For a more clear description of the embodiments of the present application, the following describes, with reference to fig. 6 to fig. 10, a schematic flowchart of the reconstruction when the terminal executes the protocol of fig. 3 for different cause values, respectively. Wherein, the cause value in fig. 6 is handover failure, the cause value in fig. 7 is integrity check failure, the cause value in fig. 8 is uplink RLC retransmission reaching the maximum number of times, the cause value in fig. 9 is random access problem, and the cause value in fig. 10 is UE out-of-synchronization.
Illustratively, as shown in fig. 6, the process of reestablishing when the terminal executes the protocol of fig. 3 (the protocol improved in the embodiment of the present application) includes:
s601, the terminal device sends an RRC connection request to the network device corresponding to the first cell according to 36304.
S602, the terminal device is successfully connected with the network device RRC corresponding to the first cell.
S603, the network device corresponding to the first cell sends an RRC Connection reconfiguration message (RRC Connection Re-configuration) to the terminal device, where the message carries the cause value.
Specifically, the processes of S601-S603 are similar to those of S401-S403, and reference may be made to the descriptions of S401-S403, which are not described herein again.
The handover failure may be that the terminal device has a problem with the network parameters received from the network device, or that the terminal device cannot receive an update command of the network device, and so on.
The cause value for indicating the handover failure may be a number, a character string, or the like, and the embodiment of the present application is not particularly limited.
S604, the terminal equipment raises the priority of the altitude cell.
For example, the terminal device may add a second identifier to the original cell, where the second identifier is used to indicate that the priority of the original cell is higher, and when the subsequent terminal device performs cell selection, the original cell is preferentially selected.
S605, the terminal device preferentially selects the original cell, i.e. the first cell.
S606, the terminal device sends an RRC Connection Re-establishment Request (RRC Connection Re-establishment Request) to the network device corresponding to the first cell.
S607, the terminal device determines whether the RRC Connection is successfully reestablished, if the RRC Connection is successfully reestablished, S608 is executed, and if the RRC Connection is not successfully reestablished, for example, the terminal device receives an RRC Connection Re-establishment Reject command (RRC Connection Re-establishment Reject object) from the network device corresponding to the first cell, S609 is executed.
And S608, the RRC connection of the terminal device and the network device corresponding to the first cell is reestablished.
For example, the terminal device receives an RRC Connection reestablishment Complete command (RRC Connection Re-establishment Complete) from the network device corresponding to the first cell, and the reestablishment procedure is ended.
And S609, the terminal equipment and the network equipment corresponding to the first cell carry out N times of reconstruction.
S610, the terminal device determines whether the reestablishment is successful, if the reestablishment is successful, S611 is executed, and if the reestablishment is not successful, for example, the terminal device receives an RRC Connection Re-establishment Reject request (RRC Connection Re-establishment Reject object) from the network device corresponding to the first cell, S612 is executed.
S611, the terminal device completes RRC connection reestablishment with the network device corresponding to the first cell.
S612, the network device corresponding to the first cell sends an RRC Connection Release message (RRC Connection Release) to the terminal device.
S613, the terminal device does not camp on the original cell within T2 time.
S614, the terminal device executes the reconstruction process 300.
Specifically, the process of S609-S614 is similar to the process of S509-S514 described above, and reference may be made to the description of S509-S514, which is not described herein again.
Different from the embodiment corresponding to fig. 5, in the embodiment corresponding to fig. 6, a network connection failure is caused by a cause value of a handover failure between the network device corresponding to the first cell and the terminal device, and the cell priority is selected for the cause value so as to improve the priority of the original cell, so that the terminal device can be reestablished in the original cell, and a reestablishment success rate is improved.
Illustratively, as shown in fig. 7, the process of reestablishing when the terminal executes the protocol of fig. 3 (the protocol improved by the embodiment of the present application) includes:
s701, the terminal device sends an RRC connection request to the network device corresponding to the first cell according to the 36304 protocol.
S702, the terminal device is successfully connected with the network device RRC corresponding to the first cell.
Specifically, the process of S701-S702 is similar to the process of S401-S402, and reference may be specifically made to the description of S401-S402, which is not described herein again.
S703, the terminal equipment identifies the reason value of the RRC connection failure as the integrity check failure, and reduces the priority of the original cell.
The integrity check failure may be that the terminal device cannot process a command received from the network device corresponding to the first cell, and the like.
For example, the terminal device may add a first identifier to the original cell, where the first identifier is used to indicate that the priority of the original cell is low, and when the subsequent terminal device performs cell selection, the original cell may not be selected.
The cause value for indicating the integrity check failure may be a number, a character string, or the like, and the embodiment of the present application is not particularly limited.
S704, the terminal device searches for other cells meeting the residence condition to obtain a second cell.
S705, the terminal device sends an RRC Connection Re-establishment Request (RRC Connection Re-establishment Request) to the network device corresponding to the second cell.
S706, the terminal device determines whether the RRC Connection is successfully reestablished, if the RRC Connection is successfully reestablished, S707 is executed, and if the RRC Connection is not successfully reestablished, for example, the terminal device receives an RRC Connection Re-establishment Reject command (RRC Connection Re-establishment Reject object) from the network device corresponding to the second cell, S708 is executed.
And S707, the terminal device completes RRC connection reestablishment with the network device corresponding to the second cell.
And S708, the terminal equipment and the network equipment corresponding to the first cell perform N times of reconstruction.
S709, the terminal device determines whether the reestablishment is successful, if the reestablishment is successful, S710 is executed, and if the reestablishment is not successful, for example, the terminal device receives an RRC Connection Re-establishment Reject request (RRC Connection Re-establishment Reject object) from the network device corresponding to the second cell, S711 is executed.
And S710, the RRC connection of the terminal equipment and the network equipment corresponding to the first cell is reestablished.
S711, the network device corresponding to the first cell sends an RRC Connection Release message (RRC Connection Release) to the terminal device.
And S712, the terminal device does not reside in the original cell within the time T3.
S713, the terminal device executes the reconstruction process 300.
Specifically, the process of S704-S713 is similar to the process of S505-S514 described above, and reference may be made to the description of S505-S514, which is not described herein again.
Different from the embodiment corresponding to fig. 5, in the embodiment corresponding to fig. 7, the terminal device identifies the cause value of the network device network connection failure corresponding to the first cell by itself, where the cause value is integrity check failure, and selects the cell priority for the cause value, so that the terminal device can select a suitable cell for reconstruction, and improve the success rate of reconstruction.
Illustratively, as shown in fig. 8, the process of reestablishing when the terminal executes the protocol of fig. 3 (the protocol improved in the embodiment of the present application) includes:
s801, the terminal device sends an RRC connection request to the network device corresponding to the first cell according to 36304.
S802, the terminal device is successfully connected with the network device RRC corresponding to the first cell.
Specifically, the processes of S801 to S802 are similar to those of S401 to S402, and reference may be specifically made to the descriptions of S401 to S402, which are not described herein again.
S803, the terminal equipment identifies the reason value of the RRC connection failure as the maximum number of uplink RLC retransmission, and the priority of the original cell is improved.
The maximum number of uplink RLC retransmissions may be, for example, an exception in some protocols occurring during the process of transmitting information to the network device corresponding to the first cell by the terminal device.
For example, the terminal device may add a second identifier to the original cell, where the second identifier is used to indicate that the priority of the original cell is higher, and when the subsequent terminal device performs cell selection, the original cell is preferentially selected.
The cause value for indicating that the uplink RLC retransmission reaches the maximum number of times may be a number, a character string, or the like, and the embodiment of the present application is not particularly limited.
S804, the terminal device preferentially selects the original cell, i.e. the first cell.
S805, the terminal device sends an RRC Connection Re-establishment Request (RRC Connection Re-establishment Request) to the network device corresponding to the first cell.
S806, the terminal device determines whether the RRC Connection is reestablished successfully, if so, executes S807, and if not, for example, the terminal device receives an RRC Connection Re-establishment Reject command (RRC Connection Re-establishment Reject object) from the network device corresponding to the first cell, executes S808.
S807, the RRC connection of the terminal equipment and the network equipment corresponding to the first cell is reestablished.
And S808, the terminal equipment and the network equipment corresponding to the first cell perform N times of reconstruction.
S809, the terminal device determines whether the reestablishment is successful, if the reestablishment is successful, S810 is executed, and if the reestablishment is not successful, for example, the terminal device receives an RRC Connection Re-establishment Reject request (RRC Connection Re-establishment Reject object) from the network device corresponding to the first cell, S811 is executed.
And S810, completing RRC connection reestablishment of the terminal equipment and the network equipment corresponding to the first cell.
S811, the network device corresponding to the first cell sends an RRC Connection Release message (RRC Connection Release) to the terminal device.
And S812, the terminal equipment does not reside in the original cell within the time T4.
S813, the terminal device executes the reconstruction process 300.
Specifically, the processes of S804-S813 are similar to those of S605-S614 described above, and reference may be made to the descriptions of S605-S614, which are not described herein again.
Different from the embodiment corresponding to fig. 6, in the embodiment corresponding to fig. 8, the terminal device identifies, by itself, a cause value of network device network connection failure corresponding to the first cell, where the cause value is that uplink RLC retransmission reaches the maximum number of times, and performs cell priority selection for the cause value, so that the terminal device can perform re-establishment in the original cell, thereby improving the success rate of re-establishment.
Illustratively, as shown in fig. 9, the process of reestablishing when the terminal executes the protocol of fig. 3 (the protocol improved in the embodiment of the present application) includes:
s901, the terminal device sends an RRC connection request to the network device corresponding to the first cell according to 36304 protocol.
S902, the terminal device is successfully connected with the network device RRC corresponding to the first cell.
Specifically, the processes of S901 to S902 are similar to those of S401 to S402, and refer to the descriptions of S401 to S402, which are not described herein again.
S903, the terminal equipment identifies that the reason value of the RRC connection failure is a random access problem, and reduces the priority of the original cell.
The random access problem may be that the terminal device has an error in encoding information of the cells with the same frequency, that uplink and downlink power of the network device corresponding to the first cell is unbalanced, and that invalid downlink coverage is generated, which results in excessive uplink loss of the terminal device, or that the terminal device is congested in a network when the terminal device is connected to the network device corresponding to the first cell.
For example, the terminal device may add a first identifier to the original cell, where the first identifier is used to indicate that the priority of the original cell is low, and when the subsequent terminal device performs cell selection, the original cell may not be selected.
The cause value for indicating the random access problem may be a number, a character string, or the like, and the embodiment of the present application is not particularly limited.
And S904, the terminal equipment searches other cells meeting the residence condition to obtain a second cell.
S905, the terminal device sends an RRC Connection Re-establishment Request (RRC Connection Re-establishment Request) to the network device corresponding to the second cell.
S906, the terminal device determines whether the RRC Connection is successfully reestablished, if the RRC Connection is successfully reestablished, S907 is executed, and if the RRC Connection is not successfully reestablished, for example, the terminal device receives an RRC Connection Re-establishment Reject command (RRC Connection Re-establishment Reject object) from the network device corresponding to the second cell, S908 is executed.
And S907, the terminal device completes RRC connection reestablishment with the network device corresponding to the second cell.
S908, the terminal device and the network device corresponding to the first cell perform N times of reconstruction.
S909, the terminal device determines whether the reestablishment is successful, if the reestablishment is successful, S910 is executed, and if the reestablishment is not successful, for example, the terminal device receives an RRC Connection Re-establishment Reject request (RRC Connection Re-establishment Reject object) from the network device corresponding to the second cell, S911 is executed.
S910, the RRC connection of the terminal device and the network device corresponding to the first cell is reestablished.
S911, the network device corresponding to the first cell sends RRC Connection Release information (RRC Connection Release) to the terminal device.
And S912, the terminal equipment does not reside in the original cell within T5 time.
S913, the terminal device executes the reconstruction process 300.
Specifically, the process of S904-S913 is similar to that of S505-S514, and reference may be made to the description of S505-S514, which is not repeated herein.
Different from the embodiment corresponding to fig. 5, in the embodiment corresponding to fig. 9, the terminal device identifies the cause value of the network device network connection failure corresponding to the first cell by itself, where the cause value is a random access problem, and selects the cell priority for the cause value, so that the terminal device can select a suitable cell for reestablishment, and improve the success rate of reestablishment.
Illustratively, as shown in fig. 10, the process of reestablishing when the terminal executes the protocol of fig. 3 (the protocol improved by the embodiment of the present application) includes:
s1001, the terminal device sends an RRC connection request to the network device corresponding to the first cell according to the 36304 protocol.
S1002, the terminal device is successfully connected with the network device RRC corresponding to the first cell.
Specifically, the process of S1001-S1002 is similar to the process of S401-S402, and reference may be made to the description of S401-S402, which is not described herein again.
S1003, the terminal equipment identifies the reason value of RRC connection failure as UE out-of-step, and reduces the priority of the original cell.
The UE out-of-synchronization may be that the distance between the terminal device and the network device corresponding to the first cell is too long, or that the terminal device is subjected to strong wireless interference, or the like.
For example, the terminal device may add a first identifier to the original cell, where the first identifier is used to indicate that the priority of the original cell is low, and when the subsequent terminal device performs cell selection, the original cell may not be selected.
The cause value for indicating the UE out of synchronization may be a number, a character string, or the like, and the embodiment of the present application is not particularly limited.
And S1004, the terminal equipment searches for other cells meeting the residence conditions to obtain a second cell.
S1005, the terminal device sends an RRC Connection Re-establishment Request (RRC Connection Re-establishment Request) to the network device corresponding to the second cell.
S1006, the terminal device determines whether the RRC Connection is successfully reestablished, if the RRC Connection is successfully reestablished, S1007 is executed, and if the RRC Connection is not successfully reestablished, for example, the terminal device receives an RRC Connection Re-establishment Reject command (RRC Connection Re-establishment Reject object) from the network device corresponding to the second cell, S1008 is executed.
And S1007, the terminal device completes RRC connection reestablishment with the network device corresponding to the second cell.
And S1008, the terminal device and the network device corresponding to the first cell are rebuilt for N times.
S1009, the terminal device determines whether the reestablishment is successful, if the reestablishment is successful, S1010 is executed, and if the reestablishment is not successful, for example, the terminal device receives an RRC Connection Re-establishment Reject request (RRC Connection Re-establishment Reject object) from the network device corresponding to the second cell, S1011 is executed.
And S1010, completing RRC connection reestablishment of the terminal equipment and the network equipment corresponding to the first cell.
S1011, the network device corresponding to the first cell sends an RRC Connection Release message (RRC Connection Release) to the terminal device.
And S1012, the terminal equipment does not reside in the original cell within the time T6.
S1013, the terminal device executes the reconstruction flow 300.
Specifically, the process of S1004-S1013 is similar to that of S505-S514 described above, and reference may be made to the description of S505-S514, which is not described herein again.
Different from the embodiment corresponding to fig. 5, in the embodiment corresponding to fig. 10, the terminal device identifies a cause value of network device network connection failure corresponding to the first cell by itself, where the cause value is UE loss of synchronization, and selects a cell priority for the cause value, so that the terminal device can select a suitable cell for reestablishment, and improve a reestablishment success rate.
In a possible implementation manner, in fig. 5, 7, 9, and 10, if the terminal does not find another cell that satisfies the camping condition after reducing the priority of the original cell, the terminal may perform N times of reconstruction in the original cell, and perform the step after performing N times of reconstruction as in fig. 5, 7, 9, and 10, which is not described herein again.
It should be noted that the first cell and the second cell in fig. 5-10 are only used for illustration, and the first cell or the second cell in each figure does not represent the same cell.
The network connection reestablishment method according to the embodiment of the present application has been described above, and the following describes an apparatus for performing the network connection reestablishment method according to the embodiment of the present application. Those skilled in the art will understand that the method and apparatus can be combined and referred to each other, and the apparatus for network connection reestablishment provided in the embodiments of the present application can perform the steps in the network connection reestablishment method described above.
As shown in fig. 11, fig. 11 is a schematic structural diagram of a network connection reestablishment apparatus provided in this embodiment of the present application, where the network connection reestablishment apparatus may be a terminal device in this embodiment of the present application, and may also be a chip or a chip system in the terminal device. The network connection reestablishment apparatus includes: a communication unit 1101 and a processing unit 1102.
The communication unit 1101 is configured to establish a communication connection with a first cell; when the terminal device disconnects from the first cell network, the processing unit 1102 is configured to determine a reason for the network disconnection; when the terminal device determines that the reason is the first type of reason, the communication unit 1101 is further configured to request to establish network connection again in a first cell, where the first cell is a cell accessed when the network of the terminal device is disconnected; when the terminal device reestablishes network connection successfully in the first cell, the processing unit 1102 is further configured to camp in the first cell; or, when the terminal device fails to reestablish the network connection in the first cell, the communication unit 1101 is further configured to continue to reestablish the network connection in the first cell N times, where N is an integer; wherein, in the N network connection reestablishments, if the terminal device succeeds in any network connection reestablishment, the processing unit 1102 is further configured to camp in the first cell and stop performing the step of network connection reestablishment; the first kind of reasons include handover failure or maximum number of uplink radio link layer control protocol RLC retransmissions; or, when the terminal device determines that the reason is the second type of reason, the processing unit 1102 is further configured to reduce the priority of the first cell, and the processing unit 1102 is further configured to search for other cells to reestablish network connection, and when the terminal device finds a second cell meeting the camping condition in the other cells, the communication unit 1101 is further configured to request the network device corresponding to the second cell to establish network connection; or, when the terminal device does not find a cell satisfying the camping condition in another cell, the communication unit 1101 is further configured to continue to reestablish the network connection in the first cell for M times, where M is an integer; wherein, in the network connection reestablishment for M times, if the terminal device succeeds in network connection reestablishment at any time, the processing unit 1102 is further configured to camp in the first cell and stop performing the step of network connection reestablishment; the other cells do not include the first cell, and the second type of reasons includes reconfiguration failure, integrity check failure, random access problems, or terminal out-of-synchronization.
Illustratively, taking the network connection reestablishing apparatus as a terminal device or a chip system applied in the terminal device as an example, the communication unit 1101 is configured to support the network connection reestablishing apparatus to perform the communication steps in the foregoing embodiments, and the processing unit 1102 is configured to support the network connection reestablishing apparatus to perform the processing steps in the foregoing embodiments.
Illustratively, when the network connection reestablishment apparatus is a terminal device, the communication unit 1101 may be a communication interface or an interface circuit. When the network connection reestablishment apparatus is a chip or a chip system in a terminal device, the communication unit 1101 may be a communication interface. For example, the communication interface may be an input/output interface, a pin or a circuit, etc.
In one possible implementation manner, the network connection reestablishment apparatus may further include: a storage unit 1103. The storage unit 1103 may include one or more memories, which may be devices in one or more devices or circuits for storing programs or data.
The storage unit 1103 may be separate and connected to the processing unit 1102 through a communication bus. The storage unit 1103 may also be integrated with the processing unit 1102.
Taking the example that the network connection reestablishment apparatus may be a chip or a chip system of the terminal device in this embodiment as an example, the storage unit 1103 may store a computer execution instruction of the method of the terminal device, so that the processing unit 1102 executes the method of the terminal device in the foregoing embodiment. The storage unit 1103 may be a register, a cache, a Random Access Memory (RAM), or the like, and the storage unit 1103 may be integrated with the processing unit 1102. The storage unit 1103 may be a read-only memory (ROM) or other type of static storage device that may store static information and instructions, and the storage unit 1103 may be separate from the processing unit 1102.
In a possible implementation manner, the communication unit 1101 is specifically configured to receive a radio resource control Connection reconfiguration message RRC Connection Re-configuration from a network device corresponding to the first cell, where the RRC Connection reconfiguration message RRC Connection Re-configuration carries a cause value, and the cause value is used to indicate a cause of network disconnection.
In one possible implementation, the cause value includes a reconfiguration failure cause value or a handover failure cause value.
In a possible implementation manner, the processing unit 1102 is specifically configured to determine a reason for network disconnection according to local data of the terminal device; the reason for the network disconnection determined according to the local data of the terminal equipment comprises the following steps: RLC retransmissions reach a maximum number of times, integrity check fails, random access problems or terminal loss of synchronization.
In a possible implementation manner, the communication unit 1101 is further specifically configured to send an RRC Connection Re-establishment Request to a network device corresponding to the first cell.
In a possible implementation manner, the communication unit 1101 is further specifically configured to receive an RRC Connection Re-establishment Complete command RRC Connection Re-establishment Complete from the network device corresponding to the first cell; the communication unit 1101 is further specifically configured to receive an RRC Connection Re-establishment rejection request from the network device corresponding to the first cell.
In a possible implementation manner, the communication unit 1101 is further specifically configured to receive an RRC Connection Release message RRC Connection Release from a network device corresponding to the first cell; a communication unit 1101, specifically configured to release the RRC connection; the processing unit 1102 is specifically configured to not select the first cell for camping within a preset time period.
In a possible implementation manner, the processing unit 1102 is specifically further configured to switch to a network of a communication system lower than that of the first cell.
In a possible implementation manner, the processing unit 1102 is specifically further configured to add an identifier to the first cell, where the identifier is used to indicate that the priority of the first cell is low.
As an example, taking the network connection reestablishment apparatus as a chip or a chip system of a terminal system as an example, the communication unit 1101 may be configured to support the network connection reestablishment apparatus to perform S501, S502, S503, S506, S508, S509, S511, or S512 in the above embodiments. The processing unit 1102 may be configured to support the network connection reestablishment apparatus to perform S504, S505, S507, S510, S513, or S514 in the above embodiments.
For another example, taking the network connection reestablishment apparatus as a chip or a chip system of a terminal system as an example, the communication unit 1101 may further be configured to support the network connection reestablishment apparatus to execute S701, S702, S705, S707, S708, S710, or S711 in the foregoing embodiment. The processing unit 1002 may be further configured to support the network connection reestablishment apparatus to perform S703, S704, S706, S709, S712, or S713 in the foregoing embodiment.
It should be noted that, taking the network connection reestablishment apparatus as a chip or a chip system of a terminal system as an example, the communication unit 1101 and the processing unit 1102 may be respectively used to support the specific steps in the embodiments in fig. 5 to 10, which are similar to the above processes and are not described again here.
In one possible implementation, the network connection reestablishment may further include: a display unit 1104. The display unit 1104 is configured to support the network connection reestablishment apparatus to display an interface. The processing unit 1102 may be integrated with the display unit 1104 and the processing unit 1102 and the display unit 1104 may be in communication.
The apparatus of this embodiment may be correspondingly used to perform the steps performed in the above method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 12 is a schematic hardware structure diagram of a network connection reestablishment apparatus according to an embodiment of the present application. Referring to fig. 12, the apparatus includes: memory 1201, processor 1202, and interface circuitry 1203. The apparatus may also include a display 1204, wherein the memory 1201, the processor 1202, the interface circuitry 1203, and the display 1204 may communicate; illustratively, the memory 1201, the processor 1202, the interface circuit 1203 and the display 1204 may communicate through a communication bus, and the memory 1201 is used for storing computer execution instructions, is controlled by the processor 1202 to execute, and is used for executing communication through the interface circuit 1203, so as to implement the network connection reestablishment method provided by the following embodiments of the present application.
In a possible implementation manner, the computer execution instructions in the embodiment of the present application may also be referred to as application program codes, which is not specifically limited in the embodiment of the present application.
Optionally, the interface circuit 1203 may also include a transmitter and/or a receiver. Optionally, the processor 1202 may include one or more CPUs, and may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present application may be embodied directly in a hardware processor, or in a combination of the hardware and software modules in the processor.
The embodiment of the application also provides a computer readable storage medium. The methods described in the above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media may include computer storage media and communication media, and may include any medium that can communicate a computer program from one place to another. A storage medium may be any target medium that can be accessed by a computer.
In one possible implementation, the computer-readable medium may include RAM, ROM, a compact disk read-only memory (CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes disc, laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processing unit of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processing unit of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above embodiments are only for illustrating the embodiments of the present invention and are not to be construed as limiting the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the embodiments of the present invention shall be included in the scope of the present invention.

Claims (20)

1. A method for reestablishing a network connection, comprising:
the terminal equipment establishes communication connection with a first cell;
when the terminal equipment is disconnected with the first cell network, the terminal equipment determines the reason of the network disconnection;
when the terminal equipment determines that the reason is the first type of reason, the terminal equipment requests to establish network connection again in the first cell, and the first cell is a cell accessed when the network of the terminal equipment is disconnected;
when the network connection is reestablished successfully in the first cell by the terminal equipment, the terminal equipment resides in the first cell;
or when the terminal equipment fails to reestablish the network connection in the first cell, the terminal equipment continues to reestablish the network connection in the first cell for N times, wherein N is an integer; in the N network connection reestablishments, if the terminal device succeeds in any network connection reestablishment, the terminal device resides in the first cell and stops executing the step of network connection reestablishment;
the first type of reason comprises switching failure or maximum times of uplink radio link layer control protocol (RLC) retransmission;
or, when the terminal device determines that the reason is the second type of reason, the terminal device reduces the priority of the first cell, and searches for other cells to reestablish network connection, and when the terminal device finds a second cell meeting the residence condition in the other cells, the terminal device requests the network device corresponding to the second cell to establish network connection;
or when the terminal device does not find a cell meeting the residence condition in the other cells, the terminal device continues to reestablish network connection in the first cell for M times, where M is an integer; in the M times of network connection reestablishment, if the terminal equipment succeeds in network connection reestablishment at any time, the terminal equipment resides in the first cell and stops executing the step of network connection reestablishment;
the other cells do not include the first cell, and the second type of reason includes reconfiguration failure, integrity check failure, random access problem or terminal out-of-synchronization.
2. The method of claim 1, wherein the determining, by the terminal device, a cause of the network disconnection comprises:
the terminal device receives a radio resource control Connection reconfiguration message RRC Connection Re-configuration from a network device corresponding to the first cell, wherein the RRC Connection Re-configuration carries a cause value, and the cause value is used for indicating a cause of the network disconnection.
3. The method of claim 2, wherein the cause value comprises a reconfiguration failure cause value or a handover failure cause value.
4. The method of claim 1, wherein the determining, by the terminal device, a cause of the network disconnection comprises:
the terminal equipment determines the reason of the network disconnection according to the local data of the terminal equipment; wherein the reason for the network disconnection determined according to the local data of the terminal device includes: RLC retransmissions reach a maximum number of times, integrity check fails, random access problems or terminal loss of synchronization.
5. The method of claim 1, wherein the terminal device re-requesting establishment of the network connection in the first cell comprises:
and the terminal equipment sends an RRC Connection reestablishment Request RRC Connection Re-establishment Request to the network equipment corresponding to the first cell.
6. The method of claim 1, wherein the successfully reestablishing the network connection by the terminal device in the first cell comprises:
the terminal equipment receives an RRC Connection reestablishment completion command RRC Connection Re-establishment Complete from the network equipment corresponding to the first cell;
the terminal equipment fails to reestablish the network connection in the first cell and comprises the following steps:
and the terminal equipment receives an RRC Connection reestablishment rejection command RRC Connection Re-establishment Reject Reject from the network equipment corresponding to the first cell.
7. The method according to any of claims 1-6, wherein the terminal device continues after the first cell reestablishes the network connection N times, further comprising:
the terminal equipment receives an RRC Connection Release message RRC Connection Release from the network equipment corresponding to the first cell;
the terminal equipment releases RRC connection;
and the terminal equipment does not select the first cell for residing in a preset time period.
8. The method of claim 7, further comprising:
and the terminal equipment is switched to a network with a communication system lower than that of the first cell.
9. The method of any of claims 1-6, wherein the terminal device deprioritizing the first cell comprises:
and the terminal equipment adds an identifier for the first cell, wherein the identifier is used for indicating that the priority of the first cell is low.
10. An apparatus for network connection reestablishment, comprising a memory, a processor, and a communication unit, the memory configured to store instructions;
the communication unit is used for establishing communication connection with a first cell;
the processor is configured to determine a cause of network disconnection when the terminal device is disconnected from the first cell network;
when the terminal device determines that the reason is the first type of reason, the communication unit is further configured to re-request establishment of network connection in the first cell, where the first cell is a cell accessed when the network of the terminal device is disconnected;
the processor is further configured to camp in the first cell when the terminal device succeeds in reestablishing the network connection in the first cell;
or, when the terminal device fails to reestablish the network connection in the first cell, the communication unit is further configured to continue to reestablish the network connection in the first cell for N times, where N is an integer; wherein, in the N network connection reestablishments, if the terminal device succeeds in any network connection reestablishment, the processor is further configured to camp in the first cell and stop performing the step of network connection reestablishment;
the first type of reason comprises switching failure or maximum times of uplink radio link layer control protocol (RLC) retransmission;
or, when the terminal device determines that the reason is the second type of reason, the processor is further configured to reduce the priority of the first cell, and the processor is further configured to search for other cells to reestablish network connection, and when the terminal device finds a second cell that meets a camping condition in the other cells, the communication unit is further configured to request the network device corresponding to the second cell to establish network connection;
or, when the terminal device does not find a cell satisfying the camping condition in the other cells, the communication unit is further configured to continue to reestablish the network connection in the first cell for M times, where M is an integer; wherein, in the network connection reestablishment for M times, if the terminal device succeeds in network connection reestablishment for any time, the processor is further configured to camp in the first cell and stop executing the step of network connection reestablishment;
the other cells do not include the first cell, and the second type of reason includes reconfiguration failure, integrity check failure, random access problem or terminal out-of-synchronization.
11. The apparatus according to claim 10, wherein the communication unit is specifically configured to receive a radio resource control Connection reconfiguration message RRC Connection Re-configuration from a network device corresponding to the first cell, where the RRC Connection Re-configuration carries a cause value, and the cause value is used to indicate a cause of the network disconnection.
12. The apparatus of claim 11, wherein the cause value comprises a reconfiguration failure cause value or a handover failure cause value.
13. The apparatus of claim 10, wherein the processor is specifically configured to determine a cause of the network disconnection according to local data of the terminal device; wherein the reason for the network disconnection determined according to the local data of the terminal device includes: RLC retransmissions reach a maximum number of times, integrity check fails, random access problems or terminal loss of synchronization.
14. The apparatus of claim 10,
the communication unit is further specifically configured to send an RRC Connection reestablishment Request RRC Connection Re-establishment Request to the network device corresponding to the first cell.
15. The apparatus of claim 10,
the communication unit is further specifically configured to receive an RRC Connection Re-establishment Complete command RRC Connection Re-establishment Complete from the network device corresponding to the first cell;
the communication unit is further specifically configured to receive an RRC Connection reestablishment rejection command RRC Connection Re-assignment Reject request from the network device corresponding to the first cell.
16. The apparatus according to any one of claims 10 to 15,
the communication unit is further specifically configured to receive an RRC Connection Release message RRC Connection Release from a network device corresponding to the first cell;
the communication unit is specifically configured to release an RRC connection;
the processor is specifically further configured to not select the first cell for camping within a preset time period.
17. The apparatus of claim 16,
the processor is specifically further configured to switch to a network of a communication system lower than the first cell.
18. The apparatus according to any one of claims 10 to 15,
the processor is further specifically configured to add an identifier to the first cell, where the identifier is used to indicate that the priority of the first cell is low.
19. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 9.
20. A computer program product, comprising a computer program which, when executed, causes a computer to perform the method of any one of claims 1 to 9.
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