CN117641490A - 5G terminal and method for inhibiting ping-pong reselection thereof - Google Patents
5G terminal and method for inhibiting ping-pong reselection thereof Download PDFInfo
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Abstract
The invention discloses a method for inhibiting ping-pong reselection by a 5G terminal. The mobile terminal records information of the history service cell each time it performs cell reselection. The mobile terminal compares the information of the third cell with the recorded historical service cell and judges whether the mobile terminal is in a ping-pong reselection state or not. When the mobile terminal is not in the ping-pong reselection state currently, the mobile terminal normally executes a cell reselection process. When the mobile terminal is in the ping-pong reselection state currently, the mobile terminal judges whether the fourth cell belongs to a neighboring cell with ping-pong reselection risk. If so, the mobile terminal does not take the fourth cell as a reselection candidate cell. If not, the mobile terminal takes the fourth cell as a reselection candidate cell. According to the invention, the neighbor cell with the ping-pong reselection risk is automatically determined to be shielded as the reselection candidate cell, so that the shielded neighbor cell cannot be called as the reselection target cell, and the occurrence of ping-pong reselection is restrained.
Description
Technical Field
The invention relates to a method for inhibiting ping-pong reselection by a mobile terminal. The mobile terminal (for short, terminal) in the present invention refers to a single-mode terminal supporting only 5G NR, or a 5G multimode terminal supporting mobile communication networks such as 5G NR and 4G LTE simultaneously.
Background
In the 4G LTE and 5G NR mobile communication systems, after a mobile terminal has camped on a current serving cell, the mobile terminal needs to monitor signal quality and signal strength of the current serving cell and neighboring cells in an IDLE state (rrc_idle) or an INACTIVE state (rrc_inactive), and if a better cell satisfies camping and reselection conditions, the mobile terminal camps on a new cell.
The general process of cell reselection includes that firstly, a mobile terminal receives system information (such as a system information block SIB) from a resident current service cell (called an original cell) to obtain information of a cell resident parameter, a cell reselection parameter, a same-frequency neighbor list, a different-system (Inter Radio Access Technology, inter RAT) neighbor list and the like, then the mobile terminal continuously measures signal quality and signal strength of the current service cell and each neighbor cell, calculates corresponding S criterion parameter and R criterion parameter of the current service cell and the adjacent cell to perform reselection evaluation, and if a better cell meets corresponding reselection conditions, the mobile terminal selects a most suitable cell (called a target cell) to be resident again. If the source cell and the target cell belong to the same radio access technology (Radio Access Technology, RAT), it is referred to as Intra-radio access technology (Intra-RAT) reselection, or Intra-system reselection, or Intra-mode reselection. If the original cell and the target cell belong to different radio access technologies, it is called Inter-radio access technology (Inter RAT) reselection, or Inter-system reselection, or Inter-mode reselection.
Along with the increasing complexity of the mobile communication network environment, the current serving cell signal and the neighbor cell signal measured by the terminal in the moving process have the characteristics of instability, fluctuation and the like, so that the signal measured by the terminal to the second cell is weakened just after the terminal performs reselection from the first cell to the second cell, the signal of the first cell can be maintained relatively strong, the terminal can meet the requirement of starting to perform reselection again to the first cell again in a short time again, and the repeated reselection 'ping-pong effect' between the first cell and the second cell is caused, which is called ping-pong reselection for short. The above-described "ping-pong effect" is not limited to between two cells, but may be between a plurality of cells in a nearby area. Therefore, ping-pong reselection refers to the change of signal strength of a current serving cell and a neighboring cell measured by a terminal in a certain area in a mobile communication system, so that the terminal repeatedly performs reselection for multiple times in a short time between two cells (or multiple cells), and the residence time of the terminal in a target cell after each reselection is relatively short. Frequent ping-pong reselection easily causes the problem of lost paging and power consumption promotion of the terminal, and also can influence normal service initiation of the terminal, and has poor user experience.
The prior art generally suppresses some ping-pong reselections by optimizing network parameters such as reselection threshold parameters (threshServingLowP, thressServingLowQ), reselection priorities, reselection hysteresis (Qhyst), cell offsets (Qoffset), and reselection time hysteresis parameters (t-ReleasectionNR), etc., but network optimization cannot solve all ping-pong reselection problems due to the complexity of the mobile communication network. On the one hand, the network parameters are difficult to set, for example, for base station site dense areas such as urban areas, county areas, large commercial areas, stadiums, stations, comprehensive transportation hubs and the like, the cell sites are concentrated, more same-frequency adjacent areas, different-frequency adjacent areas and different-system adjacent areas exist, the evaluation and adjustment of the network optimization parameters in the areas are difficult, other negative effects can be brought, for example, abnormal phenomena such as untimely reselection and paging missing can be caused for the adjacent areas without ping-pong reselection hidden danger originally. Especially, the coverage radius of the 5G cell is smaller, the network is arranged more densely, and the phenomena of ping-pong reselection in the system, ping-pong reselection among systems and the like are more easily encountered. The 5G introduces beamforming and beam management technologies, and factors such as spatial position change and hand-held mode change of the terminal equipment are more likely to cause fluctuation of signal measurement values of the terminal, so that challenges faced by the above prior art are still very large. On the other hand, the change of the mobile communication environment may cause a ping-pong reselection problem, such as the appearance of a new building, etc., while the readjustment parameters through network optimization have hysteresis, and the terminal still encounters the ping-pong reselection problem before the network adjusts the parameters.
Disclosure of Invention
The technical problem to be solved by the invention is how to inhibit ping-pong reselection of the 5G terminal.
In order to solve the technical problems, the invention provides a method for inhibiting ping-pong reselection by a 5G terminal, which comprises the following steps. Step S1: and when the mobile terminal performs cell reselection each time, recording two pieces of information of the cell which is left in the current reselection, namely the signal strength of the cell which is left when the mobile terminal newly reselects to the cell which is left, and the entering times of the mobile terminal reselecting to the cell which is left, as the information of the historical service cell. Step S2: and the mobile terminal compares the information of the third cell with the recorded historical service cell and judges whether the mobile terminal is in a ping-pong reselection state or not. And when the mobile terminal is not in the ping-pong reselection state currently, entering a step S3. When the mobile terminal is currently in the ping-pong reselection state, step S4 is entered. Step S3: the mobile terminal normally executes the measurement detection, reselection evaluation and cell reselection process when the reselection criteria are met by the current serving cell and the same-frequency or different-system neighbor cells. Step S4: and the mobile terminal judges whether the fourth cell belongs to the neighbor cell with ping-pong reselection risk or not. If so, the mobile terminal does not take the fourth cell as a reselection candidate cell. If not, the mobile terminal takes the fourth cell as a reselection candidate cell.
Further, in step S1, the information of the history serving cell further includes one or more of a frequency point and a cell identification code of the exiting cell.
Preferably, in the step S1, the mobile terminal records the above information of the N cells that leave during reselection in time sequence, which is called N pieces of information of history service cells, where N is an integer greater than or equal to 2; if the information of N history service cells has been recorded, the mobile terminal deletes the information of the history service cell which is earliest in time when adding the information of the new history service cell.
Further, the step S2 specifically includes the following substeps. Step S21: when the mobile terminal decides to execute reselection, the target cell related to the reselection is called a third cell, and the mobile terminal judges whether the third cell is a recorded historical service cell of the mobile terminal. If not, the mobile terminal is not considered to be in the ping-pong reselection state currently. If so, step S22 is entered. Step S22: the mobile terminal acquires the signal intensity of a third cell when the mobile terminal newly reselects to the third cell in the recorded information of the historical service cell, and the signal intensity is called first signal intensity; the current signal strength of the third cell is called a second signal strength; the mobile terminal calculates the variation amplitude of the first signal intensity and the second signal intensity, namely the difference value between the second signal intensity and the first signal intensity. And if the change amplitude is greater than or equal to a preset first threshold value, the mobile terminal is not in the ping-pong reselection state currently. If the change amplitude is smaller than a preset first threshold value, the mobile terminal updates the signal intensity of a third cell when the mobile terminal reselects to the third cell for the last time in the recorded information of the historical service cell to the current signal intensity of the third cell, and meanwhile, the entering times of the mobile terminal reselecting to the third cell is increased by 1; then step S23 is entered. Step S23: if the number of the historical service cells recorded by the mobile terminal is more than or equal to 2 and the entering times of the two recently recorded or updated historical service cells are both more than a preset second threshold value, the mobile terminal is considered to be in a ping-pong reselection state at present; otherwise, the mobile terminal is not in the ping-pong reselection state currently.
Further, in the steps S21 and S22, after determining that the mobile terminal is not currently in the ping-pong reselection state, the mobile terminal firstly clears all the previously recorded information of the history serving cell, and then uses the third cell as the new history serving cell record information, specifically uses the current signal strength of the third cell as the signal strength of the third cell when the mobile terminal is newly reselected to the third cell, and sets the number of times of entering the mobile terminal to reselect to the third cell to be 1.
Further, in the step S4, the reselection criteria are defined by communication protocols TS 38.304 and TS 36.304.
Further, the step S4 specifically includes the following substeps. Step S41: the mobile terminal resides in the current serving cell for more than 1 second and finds that a neighbor cell meets a certain reselection criterion, which is called a fourth cell. Step S42: if the fourth cell is in the recorded history service cell of the mobile terminal and the number of times of entering the fourth cell is greater than or equal to a preset second threshold value, entering step S43; otherwise, the mobile terminal considers that the fourth cell does not belong to the neighbor cell with the ping-pong reselection risk, and the mobile terminal takes the fourth cell as a reselection candidate cell. Step S43: if the fourth cell is a cell in the same system and the difference value between the current signal strength of the fourth cell and the signal strength of the current serving cell of the mobile terminal is smaller than or equal to a preset third threshold value, the mobile terminal considers that the fourth cell is a neighbor cell with ping-pong reselection risk, and the mobile terminal does not take the fourth cell as a reselection candidate cell. If the fourth cell is a cell of a different system, the signal strength of the current serving cell of the mobile terminal is greater than or equal to a preset fourth threshold value, and the current signal strength of the fourth cell is less than or equal to a preset fifth threshold value, the mobile terminal considers that the fourth cell is a neighbor cell with ping-pong reselection risk, and the mobile terminal does not take the fourth cell as a reselection candidate cell. Either before or simultaneously with the determination. In addition to the above two cases, the mobile terminal considers that the fourth cell does not belong to a neighboring cell with ping-pong reselection risk, and the mobile terminal takes the fourth cell as a reselection candidate cell.
Further, in the steps S42 and S43, if there is only one reselection candidate cell, i.e., only one fourth cell, the mobile terminal performs a reselection procedure to the fourth cell; if a plurality of reselection candidate cells exist at the same time, namely, more than one fourth cell meeting the reselection criterion exists, the mobile terminal selects one of the reselection candidate cells as a reselection target cell and performs a reselection process to the reselection target cell.
The invention also provides a 5G terminal for inhibiting ping-pong reselection, which comprises a recording unit, a judging unit, a first executing unit and a second executing unit. The recording unit is used for recording two items of information of the cell which is separated when the mobile terminal reselects this time when the mobile terminal reselects the cell each time, namely the signal intensity of the separated cell when the mobile terminal reselects the separated cell last time and the entering times of the separated cell when the mobile terminal reselects the separated cell, as the information of the history service cell. The judging unit refers to the currently reselected target cell as a third cell, compares the information of the third cell with the recorded historical service cell, and judges whether the mobile terminal is currently in a ping-pong reselection state. And the first execution unit is used for normally executing the measurement detection, reselection evaluation and cell reselection process when the current service cell and the same-frequency or different-system neighbor cell meet the reselection criterion when the mobile terminal is not in the ping-pong reselection state currently. The second execution unit is used for judging whether the fourth cell belongs to a neighbor cell with ping-pong reselection risk or not when the mobile terminal is in a ping-pong reselection state currently and the neighbor cell which currently meets a certain reselection criterion is called the fourth cell; if yes, the mobile terminal does not take the fourth cell as a reselection candidate cell; if not, the mobile terminal takes the fourth cell as a reselection candidate cell.
Further, the 5G terminal or the mobile terminal refers to a 5G NR single mode terminal or a 5G multimode terminal supporting mobile communication networks such as 5G NR and 4G LTE simultaneously.
The technical effect of the invention is that the mobile terminal can automatically determine and shield the neighbor cell with ping-pong reselection risk as the reselection candidate cell, so that the shielded neighbor cell cannot be called as the reselection target cell, thereby inhibiting the occurrence of ping-pong reselection.
Drawings
Fig. 1 is a flow chart of a method for suppressing ping-pong reselection by a 5G terminal according to the present invention.
Fig. 2 is a specific flowchart of step S2.
Fig. 3 is a specific flowchart of step S4.
Fig. 4 is a schematic structural diagram of a 5G terminal capable of suppressing ping-pong reselection according to the present invention.
The reference numerals in the drawings illustrate: 1 is a recording unit, 2 is a judging unit, 3 is a first executing unit, and 4 is a second executing unit.
Detailed Description
Referring to fig. 1, the method for suppressing ping-pong reselection by the 5G terminal according to the present invention includes the following steps. The 5G terminal or the mobile terminal refers to a 5G NR single-mode terminal or a 5G multimode terminal supporting mobile communication networks such as 5G NR and 4G LTE.
Step S1: when the mobile terminal performs cell reselection each time, two items of information of a cell which is left in the reselection (namely, an original cell related to the reselection) are recorded, namely, the signal strength of the cell which is left when the mobile terminal reselects to the cell which is left last time, the entering times of the mobile terminal reselects to the cell which is left, and meanwhile, the parameter information of frequency points, cell identification codes and the like of the cell which is left and used for distinguishing different cells are recorded as the information of a historical service cell. Preferably, the mobile terminal records the above information of N cells that leave at the time of reselection, referred to as N pieces of information of history service cells, N being an integer greater than or equal to 2, in time sequence. If the information of N history service cells has been recorded, the mobile terminal deletes the information of the history service cell which is earliest in time when adding the information of the new history service cell.
Step S2: the mobile terminal compares the information of the currently reselected target cell (called a third cell, only one third cell) and the recorded historical service cell, and judges whether the mobile terminal is in a ping-pong reselection state or not. And when the mobile terminal is not in the ping-pong reselection state currently, entering a step S3. When the mobile terminal is currently in the ping-pong reselection state, step S4 is entered.
Step S3: the mobile terminal normally executes the measurement detection, reselection evaluation and cell reselection process when the reselection criterion is met of the current service cell and the same-frequency or different-system neighbor cell according to the existing communication protocol requirements.
Step S4: the mobile terminal determines whether a neighbor cell (called a fourth cell) satisfying a certain reselection criterion belongs to a neighbor cell having a ping-pong reselection risk. If the fourth cell does not belong to the neighbor cell with the ping-pong reselection risk, the mobile terminal takes the fourth cell as a reselection candidate cell. If the fourth cell belongs to the neighbor cell with ping-pong reselection risk, the mobile terminal does not take the fourth cell as a reselection candidate cell, so that the fourth cell does not become a reselection target cell, namely, the reselection process to the fourth cell is inhibited. There may be one or more fourth cells. When there are a plurality of fourth cells, i.e. cells satisfying the reselection criterion, the terminal selects one of them as a target cell for reselection, i.e. the third cell, according to the protocol.
Referring to fig. 2, the step S2 specifically includes the following sub-steps.
Step S21: when the mobile terminal decides to perform reselection, the target cell related to the reselection is called a third cell, and the mobile terminal determines whether the third cell is a recorded history service cell of the mobile terminal, for example, matching is performed according to parameters such as a frequency point, a cell identification code and the like. If not, the mobile terminal considers that the reselection is normal cell reselection, and the risk of ping-pong reselection does not exist, namely the mobile terminal is not in the ping-pong reselection state currently. The mobile terminal firstly clears all the information of the history service cell recorded before, then takes the third cell as a new history service cell, takes the current signal intensity of the third cell as the signal intensity of the third cell when the third cell is reselected last time, and simultaneously sets the entering times of the mobile terminal for reselecting the third cell as 1. If so, step S22 is entered.
Step S22: the mobile terminal acquires the signal intensity of a third cell when the mobile terminal newly reselects to the third cell in the recorded information of the historical service cell, and the signal intensity is called first signal intensity. The current signal strength of the third cell is referred to as the second signal strength. The mobile terminal calculates the variation amplitude of the first signal intensity and the second signal intensity, namely the difference value between the second signal intensity and the first signal intensity.
If the variation amplitude is greater than or equal to a preset first threshold value, the mobile terminal considers that the reselection is normal cell reselection, and the risk of ping-pong reselection does not exist, namely the mobile terminal is not in a ping-pong reselection state currently. The mobile terminal firstly clears all the information of the history service cell recorded before, then takes the third cell as a new history service cell, takes the current signal intensity of the third cell as the signal intensity of the third cell when the third cell is reselected last time, and simultaneously sets the entering times of the mobile terminal for reselecting the third cell as 1.
If the change amplitude is smaller than a preset first threshold value, the mobile terminal considers that the present reselection possibly has the risk of ping-pong reselection. And the mobile terminal updates the signal intensity of the third cell to the current signal intensity of the third cell when the mobile terminal reselects to the third cell in the recorded information of the historical service cell, and simultaneously adds 1 to the entering times of the mobile terminal reselecting to the third cell. Then step S23 is entered.
Step S23: if the number of the historical service cells recorded by the mobile terminal is more than or equal to 2 and the entering times of the two recently recorded or updated historical service cells are both more than a preset second threshold value, the mobile terminal is considered to be in a ping-pong reselection state at present; otherwise, the mobile terminal is not in the ping-pong reselection state currently.
Referring to fig. 3, the step S4 specifically includes the following sub-steps.
Step S41: the mobile terminal camps on the current serving cell for more than 1 second and finds that a neighbor cell meets a certain reselection criterion of the existing communication protocols (e.g. TS 38.304 and TS 36.304), which is called a fourth cell. And then proceeds to step S42.
Step S42: if the fourth cell is in the recorded history service cell of the mobile terminal, for example, matching is performed according to parameters such as frequency point and cell identification code, and the number of times of entering the fourth cell is greater than or equal to a preset second threshold value, entering step S43; otherwise, the mobile terminal considers that the fourth cell does not belong to the neighbor cell with the ping-pong reselection risk, and the mobile terminal takes the fourth cell as a reselection candidate cell.
Step S43: if the fourth cell is a cell in the same system and the difference value between the current signal strength of the fourth cell and the signal strength of the current serving cell of the mobile terminal is smaller than or equal to a preset third threshold value, the mobile terminal considers that the fourth cell is a neighbor cell with ping-pong reselection risk, and the mobile terminal does not take the fourth cell as a reselection candidate cell. If the fourth cell is a cell of a different system, the signal strength of the current serving cell of the mobile terminal is greater than or equal to a preset fourth threshold value, and the current signal strength of the fourth cell is less than or equal to a preset fifth threshold value, the mobile terminal considers that the fourth cell is a neighbor cell with ping-pong reselection risk, and the mobile terminal does not take the fourth cell as a reselection candidate cell. The order of the above two determinations is not limited, and may be performed before or simultaneously. In addition to the above two cases, the mobile terminal considers that the fourth cell does not belong to a neighboring cell with ping-pong reselection risk, and the mobile terminal takes the fourth cell as a reselection candidate cell.
In the steps S42 and S43, if there is only one reselection candidate cell, i.e., there is only one fourth cell, the mobile terminal performs a reselection procedure to the fourth cell; if a plurality of reselection candidate cells exist at the same time, namely, more than one fourth cell meeting the reselection condition exists, the mobile terminal selects one of the reselection candidate cells as a reselection target cell according to the existing communication protocol requirement and executes a reselection process to the reselection target cell.
Referring to fig. 4, the 5G terminal capable of suppressing ping-pong reselection according to the present invention includes a recording unit 1, a judging unit 2, a first executing unit 3 and a second executing unit 4. The apparatus shown in fig. 4 corresponds to the method shown in fig. 1.
The recording unit 1 is configured to record, when the mobile terminal performs cell reselection each time, two pieces of information of a cell that is away from the mobile terminal when the mobile terminal reselects to the cell that is away from the mobile terminal last time (i.e., an original cell related to the current reselection), that is, a signal strength of the cell that is away from the mobile terminal when the mobile terminal reselects to the cell that is away from the mobile terminal last time, and an entry number of the cell that is away from the mobile terminal when the mobile terminal reselects to the cell that is away from the mobile terminal, as information of a history serving cell.
The judging unit 2 is configured to compare the information of the currently reselected target cell (referred to as a third cell) with the recorded information of the history serving cell, and determine whether the mobile terminal is currently in a ping-pong reselection state.
The first execution unit 3 is configured to normally execute measurement detection, reselection evaluation, and cell reselection procedures when the reselection criterion is satisfied for a current serving cell and a same-frequency or different-system neighbor cell according to an existing communication protocol requirement when the mobile terminal is not currently in a ping-pong reselection state.
The second execution unit 4 is configured to determine, when the mobile terminal is currently in a ping-pong reselection state, whether a neighboring cell (called a fourth cell) that meets a certain reselection criterion belongs to a neighboring cell that is at risk of ping-pong reselection. If the fourth cell does not belong to the neighbor cell with the ping-pong reselection risk, the mobile terminal takes the fourth cell as a reselection candidate cell. If the fourth cell belongs to the neighbor cell with the ping-pong reselection risk, the mobile terminal does not take the fourth cell as a reselection candidate cell.
The invention firstly judges whether the mobile terminal is in a ping-pong reselection state at present, and normally executes a series of cell reselection procedures under the condition that the mobile terminal is not in the ping-pong reselection state, and judges whether a neighbor cell (namely a fourth cell) meeting a certain reselection criterion has a ping-pong reselection risk under the condition that the mobile terminal is in the ping-pong reselection state. And for the fourth cell with ping-pong reselection risk, the mobile terminal takes the fourth cell as a reselection candidate cell, and for the fourth cell with ping-pong reselection risk, the mobile terminal does not take the fourth cell as a reselection candidate cell. The mobile terminal autonomously decides the shielding part of the neighbor cells as reselection candidate cells, so that the shielded neighbor cells cannot be used as reselection target cells, thereby inhibiting ping-pong reselection, avoiding the problems of voice or data service initiation delay, power consumption increase, called call completion rate reduction and the like caused by ping-pong reselection, and also making up for abnormal user perception caused by abnormal network reselection parameter configuration or insufficient network neighbor cell optimization, and improving user experience.
The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for inhibiting ping-pong reselection by a 5G terminal is characterized by comprising the following steps of;
step S1: when the mobile terminal performs cell reselection each time, recording two items of information of a cell which is left when the mobile terminal reselects the cell, namely the signal strength of the cell which is left when the mobile terminal reselects the cell which is left last time, and the entering times of the cell which is left when the mobile terminal reselects the cell which is left, and taking the two items of information as information of a historical service cell;
step S2: the current reselected target cell is called a third cell, and the mobile terminal compares the information of the third cell with the recorded historical service cell and judges whether the mobile terminal is in a ping-pong reselection state or not;
when the mobile terminal is not in the ping-pong reselection state currently, entering a step S3;
when the mobile terminal is in a ping-pong reselection state currently, entering a step S4;
step S3: the mobile terminal normally executes the measurement detection, reselection evaluation and cell reselection process when the reselection criterion is met by the current serving cell and the same-frequency or different-system neighbor cell;
step S4: the neighbor cell which currently meets a certain reselection criterion is called a fourth cell, and the mobile terminal judges whether the fourth cell belongs to the neighbor cell with ping-pong reselection risk;
if yes, the mobile terminal does not take the fourth cell as a reselection candidate cell;
if not, the mobile terminal takes the fourth cell as a reselection candidate cell.
2. The method for suppressing ping-pong reselection by a 5G terminal according to claim 1, wherein in step S1, the information of the history serving cell further includes one or more of a frequency point and a cell identification code of the exiting cell.
3. The method for suppressing ping-pong reselection by a 5G terminal according to claim 1, wherein in step S1, the mobile terminal records the information of the N cells that leave during reselection in time sequence, called N pieces of information of history service cells, N being an integer greater than or equal to 2; if the information of N history service cells has been recorded, the mobile terminal deletes the information of the history service cell which is earliest in time when adding the information of the new history service cell.
4. The method for suppressing ping-pong reselection by a 5G terminal according to claim 1, wherein the step S2 specifically includes the following sub-steps;
step S21: when the mobile terminal decides to execute reselection, the target cell related to the reselection is called a third cell, and the mobile terminal judges whether the third cell is a recorded historical service cell of the mobile terminal;
if not, the mobile terminal is not in the ping-pong reselection state currently;
if yes, go to step S22;
step S22: the mobile terminal acquires the signal intensity of a third cell when the mobile terminal newly reselects to the third cell in the recorded information of the historical service cell, and the signal intensity is called first signal intensity; the current signal strength of the third cell is called a second signal strength; the mobile terminal calculates the variation amplitude of the first signal intensity and the second signal intensity, namely the difference value between the second signal intensity and the first signal intensity;
if the change amplitude is greater than or equal to a preset first threshold value, the mobile terminal is considered not to be in a ping-pong reselection state currently;
if the change amplitude is smaller than a preset first threshold value, the mobile terminal updates the signal intensity of a third cell when the mobile terminal reselects to the third cell for the last time in the recorded information of the historical service cell to the current signal intensity of the third cell, and meanwhile, the entering times of the mobile terminal reselecting to the third cell is increased by 1; then step S23 is entered;
step S23: if the number of the historical service cells recorded by the mobile terminal is more than or equal to 2 and the entering times of the two recently recorded or updated historical service cells are both more than a preset second threshold value, the mobile terminal is considered to be in a ping-pong reselection state at present; otherwise, the mobile terminal is not in the ping-pong reselection state currently.
5. The method for suppressing ping-pong reselection by a 5G terminal according to claim 4, wherein in step S21 and step S22, when it is determined that the mobile terminal is not currently in the ping-pong reselection state, the mobile terminal clears all the previously recorded information of the history serving cell, then uses the third cell as the new history serving cell record information, specifically uses the current signal strength of the third cell as the signal strength of the third cell when the third cell is newly reselected, and sets the number of times of entering the mobile terminal to reselect to the third cell to be 1.
6. The method for suppressing ping-pong reselection by a 5G terminal according to claim 1, wherein in step S4, the reselection criteria are defined by communication protocols TS 38.304 and TS 36.304.
7. The method for suppressing ping-pong reselection by a 5G terminal according to claim 1, wherein the step S4 specifically includes the following sub-steps;
step S41: the mobile terminal resides in a current service cell for more than 1 second, and finds that a neighboring cell meets a certain reselection criterion, wherein the neighboring cell meeting the certain reselection criterion is called a fourth cell;
step S42: if the fourth cell is in the recorded history service cell of the mobile terminal and the number of times of entering the fourth cell is greater than or equal to a preset second threshold value, entering step S43; otherwise, the mobile terminal considers that the fourth cell does not belong to the neighbor cell with the ping-pong reselection risk, and takes the fourth cell as a reselection candidate cell;
step S43: if the fourth cell is a cell in the same system and the difference value between the current signal intensity of the fourth cell and the signal intensity of the current service cell of the mobile terminal is smaller than or equal to a preset third threshold value, the mobile terminal considers that the fourth cell is a neighbor cell with ping-pong reselection risk, and the mobile terminal does not take the fourth cell as a reselection candidate cell;
if the fourth cell is a cell of a different system, the signal intensity of the current service cell of the mobile terminal is larger than or equal to a preset fourth threshold value, and the current signal intensity of the fourth cell is smaller than or equal to a preset fifth threshold value, the mobile terminal considers that the fourth cell is a neighbor cell with ping-pong reselection risk, and the mobile terminal does not take the fourth cell as a reselection candidate cell;
the two judgment are carried out at the same time or before any one;
in addition to the above two cases, the mobile terminal considers that the fourth cell does not belong to a neighboring cell with ping-pong reselection risk, and the mobile terminal takes the fourth cell as a reselection candidate cell.
8. The method for suppressing ping-pong reselection by a 5G terminal of claim 7, wherein in step S42 and step S43, if there is only one reselection candidate cell, i.e., there is only one fourth cell, the mobile terminal performs a reselection procedure to the fourth cell; if a plurality of reselection candidate cells exist at the same time, namely, more than one fourth cell meeting the reselection criterion exists, the mobile terminal selects one of the reselection candidate cells as a reselection target cell and performs a reselection process to the reselection target cell.
9. The 5G terminal for inhibiting ping-pong reselection is characterized by comprising a recording unit, a judging unit, a first executing unit and a second executing unit;
the recording unit is used for recording two items of information of the cell which is separated when the mobile terminal reselects the cell every time when the mobile terminal reselects the cell, namely the signal intensity of the separated cell when the mobile terminal reselects the separated cell last time and the entering times of the separated cell when the mobile terminal reselects the separated cell, and the two items of information are used as the information of the history service cell;
the judging unit refers to the currently reselected target cell as a third cell, compares the information of the third cell with the recorded historical service cell, and judges whether the mobile terminal is currently in a ping-pong reselection state or not;
the first execution unit is used for normally executing the measurement detection, reselection evaluation and cell reselection process when the current service cell and the same-frequency or different-system neighbor cell meet the reselection criterion when the mobile terminal is not in the ping-pong reselection state currently;
the second execution unit is used for judging whether the fourth cell belongs to a neighbor cell with ping-pong reselection risk or not when the mobile terminal is in a ping-pong reselection state currently and the neighbor cell which currently meets a certain reselection criterion is called the fourth cell; if yes, the mobile terminal does not take the fourth cell as a reselection candidate cell; if not, the mobile terminal takes the fourth cell as a reselection candidate cell.
10. The 5G terminal for suppressing ping-pong reselection of claim 9, wherein the 5G terminal or mobile terminal refers to a 5G NR single mode terminal or a 5G multimode terminal supporting both 5G NR and 4G LTE mobile communication networks.
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