CN111050372A

CN111050372A - 5G RRC state transition method, device, terminal and readable storage medium

Info

Publication number: CN111050372A
Application number: CN201911340882.5A
Authority: CN
Inventors: 岳宗鹤
Original assignee: Gaoxing Wulian Technology Co ltd
Current assignee: Gosuncn Iot Technology Co ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-04-21
Anticipated expiration: 2039-12-23
Also published as: CN111050372B

Abstract

The invention discloses a 5G RRC state transition method, a device, a terminal and a computer readable storage medium, wherein the method comprises the following steps: judging whether the current cell belongs to a cell with low success probability of converting from an RRC _ INACTIVE state to an RRC _ CONNECTED state, wherein the lower the success probability is, the larger the value of the corresponding reference factor is; and if the current cell belongs to a cell with low success probability of converting the RRC _ INACTIVE state into the RRC _ CONNECTED state, selecting the cell with the minimum reference factor value as a target cell for redirection when the terminal of the current cell performs cell reselection. The invention can reduce the failure probability of the terminal converting from the RRC _ INACTIVE state to the RRC _ CONNECTED state, and improve the user experience.

Description

5G RRC state transition method, device, terminal and readable storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a 5G RRC state transition method, an apparatus, a terminal, and a computer-readable storage medium.

Background

In a 5G (fifth generation mobile communication) system, a 5G RRC (Radio Resource Control) supports three states, i.e., an RRC _ IDLE state, an RRC _ INACTIVE state, and an RRC _ CONNECTED state. In order to meet the requirements of low power consumption and large connection, a 5G system introduces a new RRC state different from 3G/4G, namely an RRC _ INACTIVE state. In the RRC _ INACTIVE state, the terminal can be always CONNECTED to the core network and the context of the terminal can be preserved, so that it can quickly return to the RRC _ CONNECTED state when necessary. However, in some extreme cases (for example, the terminal cell is a dense population cell), the transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state often fails when a service needs to be performed, and thus the service initiation fails. Radio resources are essentially used for service, and the introduction of the RRC _ INACTIVE state is intended to save radio resources, but the goal of introducing the RRC _ INACTIVE state is violated because the saving of radio resources causes service failure.

Disclosure of Invention

In view of this, the present invention provides a 5G RRC state transition method, an apparatus, a terminal and a computer readable storage medium, which can reduce the failure probability of the terminal transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state, and improve the user experience.

First, to achieve the above object, the present invention provides a 5G RRC state transition method, where the 5G RRC state includes an RRC _ IDLE state, an RRC _ INACTIVE state, and an RRC _ CONNECTED state, the method including:

judging whether the current cell belongs to a cell with low success probability of converting the RRC _ INACTIVE state into the RRC _ CONNECTED state, wherein the lower the success probability is, the larger the value of the corresponding reference factor is; and

and if the current cell belongs to a cell with low success probability of converting the RRC _ INACTIVE state into the RRC _ CONNECTED state, selecting the cell with the minimum reference factor value as a target cell for redirection when the terminal of the current cell performs cell reselection.

Preferably, the determining whether the current cell belongs to a cell with a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state includes:

judging whether the wireless resource amount occupied by the current cell for making service exceeds the preset proportion of the total resource capacity of the current cell or not; and

and if the wireless resource amount occupied by the current cell for service exceeds the preset proportion of the total resource capacity of the current cell, determining that the current cell belongs to the cell with low success probability of converting from the RRC _ INACTIVE state to the RRC _ CONNECTED state.

counting and judging whether the failure times of the current cell for switching from the RRC _ INACTIVE state to the RRC _ CONNECTED state in preset time exceeds preset times or not; and

if the failure times of the current cell from the RRC _ INACTIVE state to the RRC _ CONNECTED state within the preset time exceed the preset times, determining that the current cell belongs to the cell with low success probability of the RRC _ INACTIVE state to the RRC _ CONNECTED state.

Preferably, the reference factor of each cell has an initial value, and the reference factor of a cell increases by a preset value when the terminal of the cell fails to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state.

Preferably, the target cell is in the same radio access network notification area as the current cell.

Preferably, the method further comprises:

when the terminal initiates a RESUME request in the target cell, judging whether the RESUME request is successfully accessed; and

and if the RESUME request fails to be accessed, controlling the terminal to try to initiate the RESUME request in the target cell again after a preset time interval until the RESUME request with preset times is tried to be initiated.

Preferably, the method further comprises:

if the RESUME request of the terminal still fails to be accessed after the RESUME request of the preset times is tried to be initiated, one or more target terminals are selected in the target cell, and part of wireless resources occupied by the target terminals are split, so that the terminal is converted into the RRC _ CONNECTED state from the RRC _ INACTIVE state.

Further, to achieve the above object, the present invention provides a 5G RRC state transition device, where the 5G RRC state includes an RRC _ IDLE state, an RRC _ INACTIVE state, and an RRC _ CONNECTED state, the device including:

a judging module, configured to judge whether a current cell belongs to a cell with a low success probability of being converted from the RRC _ INACTIVE state to the RRC _ CONNECTED state, where a value of a corresponding reference factor is larger for a cell with a lower success probability; and

and a selecting module, configured to select, when the current cell belongs to a cell with a low success probability of being converted from the RRC _ INACTIVE state to the RRC _ CONNECTED state and a terminal of the current cell performs cell reselection, a cell with a smallest reference factor value as a target cell for redirection.

Further, in order to achieve the above object, the present invention further provides a terminal, where the terminal includes a processor and a memory, where the memory stores a plurality of computer programs, and the processor is configured to implement the steps of the 5G RRC state transition method when executing the computer programs stored in the memory.

Further, to achieve the above object, the present invention also provides a computer readable storage medium having a computer program stored thereon, wherein the computer program is configured to implement the steps of the above 5G RRC state transition method when executed by a processor.

Compared with the prior art, the 5G RRC state transition method, the apparatus, the terminal and the computer-readable storage medium provided by the present invention combine the reference factor and the S criterion as a selection rule for cell reselection, and if the terminal initiates the RESUME procedure in the target cell and still fails for multiple times, one or more target terminals may be selected in the target cell, and part of the radio resources occupied by the target terminals are split and provided for the terminal to use, so that the failure probability of the terminal transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state is reduced, and the user experience is improved.

Drawings

FIG. 1 is a diagram of an alternative hardware architecture for the terminal of the present invention;

FIG. 2 is a block diagram of a 5G RRC state transition device according to an embodiment of the present invention;

FIG. 3 is a flowchart illustrating steps of a 5G RRC state transition method according to an embodiment of the present invention;

fig. 4 is a flowchart illustrating a procedure of another embodiment of the 5G RRC state transition method.

Reference numerals:

terminal device	1
		Memory device	11
Processor with a memory having a plurality of memory cells	12
		Network interface	13
5G RRC state transition device	100
		Judging module	101
Selection module	102
		Control module	103
Splitting module	104

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the description relating to "first", "second", etc. in the present invention is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Fig. 1 is a schematic diagram of an alternative hardware architecture of the terminal according to the present invention.

In this embodiment, the terminal 1 may include, but is not limited to, a memory 11, a processor 12, and a network interface 13, which may be communicatively connected to each other through a system bus. It is noted that fig. 1 only shows the terminal 1 with components 11-13, but it is to be understood that not all shown components are required to be implemented, and that more or less components may be implemented instead. The terminal 1 is preferably a terminal device supporting 5G communication.

The memory 11 includes at least one type of readable storage medium including a flash memory, a hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a Programmable Read Only Memory (PROM), a magnetic memory, a magnetic disk, an optical disk, etc. In some embodiments, the memory 11 may be an internal storage unit of the terminal 1, such as a hard disk or a memory of the terminal 1. In other embodiments, the memory 11 may also be an external storage device of the terminal 1, such as a plug-in hard disk, a Smart Memory Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal 1. Of course, the memory 11 may also comprise both an internal memory unit and an external memory device of the terminal 1. In this embodiment, the memory 11 is generally used for storing an operating system installed in the terminal 1 and various application software, such as program codes of the 5G RRC state transition device 100. Furthermore, the memory 11 may also be used to temporarily store various types of data that have been output or are to be output.

The processor 12 may be a Central Processing Unit (CPU), controller, microcontroller, microprocessor, or other data Processing chip in some embodiments. The processor 12 is typically used to control the overall operation of the terminal 1. In this embodiment, the processor 12 is configured to operate the program codes stored in the memory 11 or process data, for example, operate the 5G RRC state transition apparatus 100.

The network interface 13 may comprise a wireless network interface or a wired network interface, preferably a network interface supporting 5G communication, and the network interface 13 is typically used for establishing communication connections between the terminal 1 and other devices.

Fig. 2 is a functional block diagram of a 5G RRC state transition device 100 according to a first embodiment of the present invention.

In this embodiment, the 5G RRC state transition apparatus 100 includes a series of computer program instructions stored on the memory 11, and when the computer program instructions are executed by the processor 12, the 5GRRC state transition operation of the embodiments of the present invention can be implemented, for example, the 5G RRC state transition apparatus 100 can be operated in the terminal 1. In some embodiments, the 5G RRC state transition apparatus 100 may be divided into one or more modules based on the particular operations implemented by the portions of the computer program instructions. For example, in fig. 2, the 5G RRC state transition apparatus 100 may be divided into a determining module 101, a selecting module 102, a controlling module 103, and a splitting module 104. Wherein:

the determining module 101 is configured to determine whether the current cell belongs to a cell with a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state.

In an embodiment, when the terminal 1 is powered on or enters a coverage area from a blind area, the terminal 1 will find all frequency points allowed by PLMN (public land Mobile Network) and select a suitable cell to camp on, which is defined as "cell selection", and the cell where the terminal 1 currently camps on may be defined as the current cell.

In an embodiment, the 5G RRC state transition apparatus 100 may switch the terminal 1 among an RRC _ IDLE state, an RRC _ INACTIVE state, and an RRC _ CONNECTED state. When the current cell belongs to a cell with a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state, it is considered that the failure probability of the terminal 1 transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state in the current cell is high, which may affect the user experience. In order to improve the success rate of the RRC _ INACTIVE state switching to the RRC _ CONNECTED state, the determining module 101 may be configured to determine whether the current cell belongs to a cell with a low success probability of the RRC _ INACTIVE state switching to the RRC _ CONNECTED state, and further avoid reselecting the current cell as much as possible when the terminal 1 performs cell reselection subsequently.

In an embodiment, the determining module 101 may determine whether the current cell belongs to a cell with a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state by determining whether the amount of radio resources occupied by the current cell for performing the service exceeds a preset ratio of the total resource capacity of the current cell. If the amount of the wireless resources occupied by the current cell for performing the service exceeds the preset proportion of the total resource capacity of the current cell, the determining module 101 determines that the current cell belongs to a cell with a low success probability of converting from the RRC _ INACTIVE state to the RRC _ CONNECTED state. The preset ratio may be set and adjusted according to actual application requirements, for example, the preset ratio may be set to 80%. That is, if the amount of the radio resource occupied by the current cell for performing the service exceeds 80% of the total resource capacity of the current cell, the determining module 101 may determine that the current cell belongs to a cell with a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state. If the amount of the wireless resources occupied by the current cell for performing the service does not exceed 80% of the total resource capacity of the current cell, the determining module 101 may determine that the current cell does not belong to a cell with a low success probability of converting from the RRC _ INACTIVE state to the RRC _ CONNECTED state.

In an embodiment, the determining module 101 may further perform determining whether the current cell belongs to a cell with a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state by counting and determining whether the number of times of failures occurring to the current cell to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state within a preset time exceeds a preset number of times. If the number of times of failure of the current cell to switch from the RRC _ INACTIVE state to the RRC _ CONNECTED state within a preset time exceeds the preset number of times, the determining module 101 determines that the current cell belongs to a cell with a low success probability of switching from the RRC _ INACTIVE state to the RRC _ CONNECTED state. The preset time and the preset times can also be set and adjusted according to actual application requirements, for example, the preset time is 30 minutes, and the preset times are 40 times. That is, if the number of times of failure of the current cell to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state within 30 minutes exceeds 40 times, the determining module 101 may determine that the current cell belongs to a cell with a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state. If the number of failures of the current cell to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state does not exceed 40 times within 30 minutes, the determining module 101 may determine that the current cell does not belong to a cell with a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state.

The selecting module 102 is configured to select, when the current cell belongs to a cell with a low success probability of being converted from the RRC _ INACTIVE state to the RRC _ CONNECTED state and a terminal of the current cell performs cell reselection, a cell with a smallest reference factor value as a target cell for redirection under the same S-criteria parameter.

It can be understood that, when performing cell reselection, the terminal in the prior art generally performs cell reselection based on the S-criteria.

In an embodiment, a success rate of the terminal 1 transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state may be used as a reference factor Si, and the reference factor Si is added to an S criterion of cell reselection, so as to implement cell reselection judgment by combining the S criterion and a Si value. When a certain cell fails to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state, the value of Si may be increased, and then when the terminal 1 performs cell reselection, a cell with a low Si value is preferentially selected as a target cell under the same condition, so that the success rate of switching a new cell after reselection from the RRC _ INACTIVE state to the RRC _ CONNECTED state is higher.

For example, when the terminal 1 performs cell reselection, four cells A, B, C, D are searched, and if it is determined by the S criterion that the cell A, B, C belongs to the same signal condition, the cell D is poor. If the Si value of the cell a is smaller than the Si value of the cell B and smaller than the Si value of the cell C, the selection module 102 may control the terminal to select the cell a as the target cell for redirection.

For example, when the terminal 1 performs cell reselection, four cells A, B, C, D are searched, and if it is determined through the S criterion that the signal condition of the cell D is optimal, the selection module 102 may control the terminal 1 to select the cell D as a target cell for redirection.

In an embodiment, the lower the success probability of the transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state, the larger the value of the corresponding reference factor Si. The reference factor Si of each cell may be preset with an initial value, and when the terminal of the cell fails to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state, the reference factor Si of the cell is increased by a preset value. For example, the reference factor Si of each cell has an initial value of 0, and when the terminal of a cell fails to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state, the reference factor Si of the cell increases by 1.

In one embodiment, when the failure rate of the terminal of the cell to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state increases, the reference factor Si of the cell is self-increased by a preset value.

In an embodiment, the target cell and the current cell are preferably in the same RNA (radio access network notification area), so that the terminal 1 does not initiate RNA update after redirection is successful. After the terminal 1 has redirected to the target cell, the terminal 1 may attempt to connect to the network for service.

In an embodiment, after determining a target cell in a cell reselection process, the terminal 1 may initiate a RESUME procedure in the target cell. If the terminal 1 has initiated the RESUME procedure in the target cell but is rejected by the network, multiple attempts may be performed, for example, one attempt of the RESUME procedure is performed after a time interval t, a maximum number of attempts may be set to N, where N is a positive integer, and N may be set according to an actual requirement, for example, N is set to be equal to 3. During the period of N attempts, the target cell may have other terminal services completed, and further release radio resources, so that the terminal 1 will succeed in RESUME when trying. Specifically, when the terminal 1 initiates a RESUME request in the target cell, the determining module 101 is further configured to determine whether the RESUME request is successfully accessed. If the RESUME request fails to be accessed, the control module 103 is configured to control the terminal 1 to try to initiate the RESUME request in the target cell again after a preset time interval until trying to initiate a RESUME request for a preset number of times (N times). The preset time can be set and adjusted according to actual requirements, for example, the preset time is 10 seconds.

In an embodiment, if the terminal 1 tries to initiate the RESUME request for the preset number of times (N times), and the RESUME request of the terminal still fails to be accessed, the splitting module 104 is configured to select one or more target terminals in the target cell, and split a part of radio resources occupied by the target terminals, so that the terminal 1 is switched from the RRC _ INACTIVE state to the RRC _ CONNECTED state. For example, N is equal to 3, if the terminal 1 tries to initiate a RESUME request 3 times, and the terminal still fails to access, the splitting module 104 selects one or more target terminals in the target cell, and splits a part of radio resources occupied by the target terminals, so that the terminal 1 is switched from the RRC _ INACTIVE state to the RRC _ CONNECTED state.

In one embodiment, for N retries of RESUME still fail, the existing processing methods include queuing, preemption, and other processing methods. The queuing mode violates the initial setting of the RRC _ INACTIVE state expecting to quickly return to the RRC _ CONNECTED state, and the preemption mode affects the traffic of other terminals in the current cell. For the 5G network mode, each terminal occupies a relatively large amount of bandwidth and radio resources, and one or more target terminals in the current cell may be selected, and a portion of the radio resources occupied by the target terminal is split to the terminal which retries RESUME for N times and still fails, so that the target terminal returns to the RRC _ CONNECTED state from the RRC _ INACTIVE state. The specific way of splitting the radio resources can be determined according to the actual application. For example, the radio resource occupied by the specified service of the target terminal can be split.

The 5G RRC state switching device combines the reference factor with the S criterion as a selection rule for cell reselection, and if the terminal still fails to initiate the RESUME procedure in the target cell for multiple times, one or more target terminals may be selected in the target cell, and part of the radio resources occupied by the target terminals are split for the terminal to use, so that the failure probability of the terminal switching from the RRC _ INACTIVE state to the RRC _ CONNECTED state may be reduced, and the user experience may be improved.

In addition, the invention also provides a 5G RRC state transition method.

Fig. 3 is a schematic diagram illustrating an implementation flow of the 5G RRC state transition method according to an embodiment of the invention. In this embodiment, the execution order of the steps in the flowchart shown in fig. 3 may be changed and some steps may be omitted according to different requirements.

Step S300, determining whether the current cell belongs to a cell with a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state.

In one embodiment, the terminal 1 can switch between an RRC _ IDLE state, an RRC _ INACTIVE state, and an RRC _ CONNECTED state. When the current cell belongs to a cell with a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state, it is considered that the failure probability of the terminal 1 transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state in the current cell is high, which may affect the user experience. In order to improve the success rate of switching from the RRC _ INACTIVE state to the RRC _ CONNECTED state, it may be determined whether the current cell belongs to a cell with a low success probability of switching from the RRC _ INACTIVE state to the RRC _ CONNECTED state, so as to avoid reselecting the current cell as much as possible when the terminal 1 subsequently performs cell reselection.

In an embodiment, the determination of whether the current cell belongs to the cell with the low success probability of switching from the RRC _ INACTIVE state to the RRC _ CONNECTED state may be implemented by determining whether the amount of radio resources occupied by the current cell for performing the service exceeds a preset ratio of the total resource capacity of the current cell. And if the wireless resource amount occupied by the current cell for service exceeds the preset proportion of the total resource capacity of the current cell, determining that the current cell belongs to the cell with low success probability of converting from the RRC _ INACTIVE state to the RRC _ CONNECTED state. The preset ratio may be set and adjusted according to actual application requirements, for example, the preset ratio may be set to 80%. That is, if the amount of radio resources occupied by the current cell for performing the service exceeds 80% of the total resource capacity of the current cell, it may be determined that the current cell belongs to a cell with a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state. And if the wireless resource amount occupied by the current cell for service does not exceed 80% of the total resource capacity of the current cell, determining that the current cell does not belong to the cell with low success probability of converting from the RRC _ INACTIVE state to the RRC _ CONNECTED state.

In an embodiment, the determining whether the current cell belongs to a cell with a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state may be further implemented by counting and determining whether the number of times of failures of the current cell to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state within a preset time exceeds a preset number of times. If the number of times of failures of the current cell to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state within a preset time exceeds the preset number of times, it may be determined that the current cell belongs to a cell with a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state. The preset time and the preset times can also be set and adjusted according to actual application requirements, for example, the preset time is 30 minutes, and the preset times are 40 times. That is, if the number of times of failures of the current cell to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state within 30 minutes exceeds 40 times, it may be determined that the current cell belongs to a cell having a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state. If the number of failures of the current cell to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state does not exceed 40 times within 30 minutes, it may be determined that the current cell does not belong to a cell having a low success probability of transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state.

Step S302, when the current cell belongs to a cell with a low success probability of being converted from the RRC _ INACTIVE state to the RRC _ CONNECTED state and a terminal of the current cell performs cell reselection, a cell with a minimum reference factor value is selected as a target cell for redirection under the same S criteria parameter.

In an embodiment, a success rate of the terminal 1 transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state is used as a reference factor Si, and is added to an S criterion of cell reselection, so as to implement cell reselection judgment by combining the S criterion and a Si value. When a certain cell fails to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state, the value of Si may be increased, and when the terminal 1 performs cell reselection, a cell with a low Si value is preferentially selected as a target cell under the same condition as S criterion parameters, so that a success rate of switching a new cell after reselection from the RRC _ INACTIVE state to the RRC _ CONNECTED state is higher.

For example, when the terminal 1 performs cell reselection, four cells A, B, C, D are searched, and if it is determined by the S criterion that the cell A, B, C belongs to the same signal condition, the cell D is poor. And if the Si value of the cell A is smaller than that of the cell B and smaller than that of the cell C, the terminal 1 selects the cell A as a target cell for redirection.

For example, when the terminal 1 performs cell reselection, four cells A, B, C, D are searched, and if the signal condition of the cell D is determined to be optimal by the S criterion, the terminal 1 selects the cell D as the target cell for redirection.

In addition, the invention also provides a 5G RRC state transition method.

Fig. 4 is a schematic flowchart illustrating a 5G RRC state transition method according to another embodiment of the present invention. In this embodiment, the execution order of the steps in the flowchart shown in fig. 4 may be changed and some steps may be omitted according to different requirements. Compared with fig. 3, the 5G RRC state transition method shown in fig. 4 further includes steps S304, S306, and S308.

Step S304, when the terminal 1 initiates a RESUME request in the target cell, determining whether the RESUME request is successfully accessed.

Step S306, if the RESUME request fails to be accessed, after a preset time interval, controlling the terminal 1 to try to initiate the RESUME request in the target cell again until trying to initiate the RESUME request for a preset number of times.

In an embodiment, the preset time may be set and adjusted according to an actual requirement, for example, the preset time is 10 seconds.

In an embodiment, after determining a target cell in a cell reselection process, the terminal 1 may initiate a RESUME procedure in the target cell. If the terminal 1 has initiated the RESUME procedure in the target cell but is rejected by the network, multiple attempts may be performed, for example, one attempt of the RESUME procedure is performed after a time interval t, a maximum number of attempts may be set to N, where N is a positive integer, and N may be set according to an actual requirement, for example, N is set to be equal to 3. During the period of N attempts, the target cell may have other terminal services completed, and further release radio resources, so that the terminal 1 will succeed in RESUME when trying.

Step S308, if the terminal 1 tries to initiate the RESUME request for the preset number of times and the RESUME request of the terminal still fails to access, selecting one or more target terminals in the target cell, and splitting a part of the radio resources occupied by the target terminals, so that the terminal 1 is switched from the RRC _ INACTIVE state to the RRC _ CONNECTED state.

For example, N is equal to 3, if the terminal 1 tries to initiate a RESUME request 3 times, and the terminal still fails to access, the splitting module 104 selects one or more target terminals in the target cell, and splits a part of radio resources occupied by the target terminals, so that the terminal 1 is switched from the RRC _ INACTIVE state to the RRC _ CONNECTED state.

In the 5G RRC state transition method, the reference factor and the S criterion are combined to be used as a selection rule for cell reselection, and if the terminal still fails to initiate the RESUME process in the target cell for multiple times, one or more target terminals may be selected in the target cell, and part of the radio resources occupied by the target terminals are split and supplied to the terminal for use, so that the failure probability of the terminal transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state may be reduced, and the user experience may be improved.

A computer readable storage medium, having stored thereon a computer program which, when executed by a processor, may implement the steps of a 5G RRC state transition method as follows:

and if the current cell belongs to a cell with low success probability of converting the RRC _ INACTIVE state into the RRC _ CONNECTED state, selecting the cell with the minimum reference factor value as a target cell for redirection when a terminal of the current cell performs cell reselection under the same S criterion parameters.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A5G RRC state transition method, wherein the 5G RRC states include an RRC _ IDLE state, an RRC _ INACTIVE state, and an RRC _ CONNECTED state, the method comprising:

2. The method of claim 1, wherein the determining whether the current cell belongs to a cell having a low probability of success in transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state comprises:

3. The method of claim 1, wherein the determining whether the current cell belongs to a cell having a low probability of success in transitioning from the RRC _ INACTIVE state to the RRC _ CONNECTED state comprises:

4. The method of claim 1, wherein the reference factor of each cell has an initial value, and the reference factor of a cell increases by a preset value when a terminal of the cell fails to transition from the RRC _ INACTIVE state to the RRC _ CONNECTED state.

5. The method of claim 1, wherein the target cell is in the same radio access network notification area as the current cell.

6. The method of claim 1, wherein the method further comprises:

7. The method of claim 6, wherein the method further comprises:

8. A5G RRC state transition apparatus, the 5G RRC states including an RRC _ IDLE state, an RRC _ INACTIVE state, and an RRC _ CONNECTED state, the apparatus comprising:

9. A terminal comprising a processor and a memory, the memory having stored thereon a plurality of computer programs, wherein the processor is configured to implement the steps of the 5G RRC state transition method according to any one of claims 1-7 when executing the computer programs stored in the memory.

10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the 5G RRC state transition method according to any one of claims 1-7.