CN117641488A - Method for inhibiting ping-pong reselection in mirror image detection mode and 5G terminal - Google Patents
Method for inhibiting ping-pong reselection in mirror image detection mode and 5G terminal Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a method for inhibiting ping-pong reselection by a 5G terminal in a mirror image detection mode. The mobile terminal records information of the history service cell each time it performs cell reselection. The mobile terminal temporarily does not take the fourth cell as a reselection candidate cell. The mobile terminal compares the information of the fourth cell with the recorded history service cell; if the fourth cell is not in the historical service cell recorded by the mobile terminal, the mobile terminal takes the fourth cell as a reselection candidate cell; otherwise, the mobile terminal presumes that the mobile terminal is currently resident in the fourth cell, regards the current service cell as a neighboring cell of the fourth cell, and evaluates whether the mobile terminal currently meets a reselection criterion from the fourth cell to the current service cell. If yes, the mobile terminal does not take the fourth cell as a reselection candidate cell; otherwise, the mobile terminal takes the fourth cell as a reselection candidate cell. The invention measures the ping-pong reselection in a mirror image mode and effectively inhibits the ping-pong reselection.
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 in a mirror image detection mode, which comprises the following steps. Step S1: each time the mobile terminal performs cell reselection, the following information of the cell which leaves at the time of the reselection, that is, the reselection configuration parameter information of the cell which leaves, or the necessary system information block of the cell which leaves, or both, is recorded as the information of the history service cell. Step S2: if the neighbor cell meets a certain reselection criterion specified by the existing communication protocol, the neighbor cell is called a fourth cell; the mobile terminal temporarily does not take the fourth cell as a reselection candidate cell. Step S3: the mobile terminal compares the information of the fourth cell with the recorded history service cell; if the fourth cell is not in the historical service cell recorded by the mobile terminal, the mobile terminal takes the fourth cell as a reselection candidate cell; otherwise, step S4 is entered. Step S4: the mobile terminal acquires the reselection configuration parameter information of the fourth cell and/or the necessary system information block of the fourth cell from the recorded information of the historical service cell; assuming that the mobile terminal currently resides in the fourth cell, regarding the current serving cell of the mobile terminal as a neighboring cell of the fourth cell, and evaluating whether the mobile terminal currently meets a reselection criterion from the fourth cell to the current serving cell based on a reselection configuration parameter and/or a necessary system information block of the fourth cell. If the mobile terminal currently meets a certain reselection criterion from the fourth cell to the current service cell, the mobile terminal does not take the fourth cell as a reselection candidate cell; otherwise, 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, in the step S1, the reselection configuration parameter information includes: 5G NR reselection configuration parameters described in the communication protocol TS 38.304 and 4G LTE reselection configuration parameters described in the communication protocol TS 36.304.
Further, in the step S1, if the away cell is a 4G LTE cell, SIB1, SIB3, SIB4, SIB5, SIB6, SIB7 and SIB24 are necessary system information blocks; if the exiting cell is a 5G NR cell, SIB1, SIB2, SIB3, SIB4, SIB5 are the necessary system information blocks; the necessary system information block is either an ASN.1 original code stream issued by a network or information decoded by the ASN.1.
Further, after the steps S3 and S4 are performed, if there is only one reselection candidate cell, the mobile terminal performs a reselection procedure to the reselection candidate cell; if a plurality of reselection candidate cells exist at the same time, 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.
Further, in the step S4, if the mobile terminal currently meets a reselection criterion from the fourth cell to the current serving cell, and the signal strength of the fourth cell is greater than the sum of the signal strength of the current serving cell plus a preset sixth threshold, the mobile terminal uses the fourth cell as a reselection candidate cell.
Further, if m number of fourth cells are measured in step S2, where m is an integer greater than or equal to 2, steps S3-S4 are repeatedly performed m times, each time for determining whether there is a ping-pong reselection possibility between the current serving cell and one of the fourth cells.
Further, if the fourth cell is measured in step S2, and further other neighbor cells are measured, whether the other neighbor cells meet the reselection criterion or not, further excluding whether there is a ping-pong reselection between the plurality of cells or not; the steps S3-S4 are extended as follows. Firstly, executing step S3-step S4 to judge whether the possibility of ping-pong reselection exists between the current serving cell and the fourth cell in a mirror image detection mode; if there is no ping-pong reselection possibility, the next step is continued. Then judging whether the mobile terminal currently meets a certain reselection criterion from the fourth cell to the other neighbor cells; if so, the next step is continued. Then judging whether the mobile terminal currently meets a certain reselection criterion from the other neighbor cell to the current service cell; if the judging results of the three items are yes, the mobile terminal does not take the fourth cell as a reselection candidate cell; otherwise, the mobile terminal takes the fourth cell as a reselection candidate cell.
The invention also provides a 5G terminal for inhibiting ping-pong reselection in a mirror image detection mode, which comprises a recording unit, a deferring unit, a comparing unit and a mirror image detection unit. The recording unit is used for recording the following information of the cell which is separated when the mobile terminal performs cell reselection every time, namely, the information of the separated cell reselection configuration parameter, the necessary system information block of the separated cell, or both, as the information of the history service cell. The deferring unit is used for finding that the neighbor cell meets a certain reselection criterion specified by the existing communication protocol, and the neighbor cell is called as a fourth cell; the fourth cell is temporarily not taken as a reselection candidate cell. The comparing unit is used for comparing the information of the fourth cell with the recorded history service cell; and if the fourth cell is not in the recorded historical service cell of the mobile terminal, taking the fourth cell as a reselection candidate cell. The mirror image detection unit is used for acquiring reselection configuration parameter information of the fourth cell and/or necessary system information blocks of the fourth cell from the recorded information of the historical service cell when the fourth cell is in the recorded historical service cell of the mobile terminal; assuming that the mobile terminal currently resides in a fourth cell, regarding a current service cell of the mobile terminal as a neighboring cell of the fourth cell, and evaluating whether the mobile terminal currently meets a reselection criterion from the fourth cell to the current service cell based on a reselection configuration parameter and/or a necessary system information block of the fourth cell; if so, the fourth cell is not taken as a reselection candidate cell. Otherwise, the fourth cell is used as a reselection candidate cell.
The invention has the technical effects that: and detecting the ping-pong reselection in a mirror image mode, and effectively inhibiting the 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 in a mirror detection manner.
Fig. 2 is a schematic structural diagram of a 5G terminal for suppressing ping-pong reselection in a mirror detection manner according to the present invention.
The reference numerals in the drawings illustrate: a recording unit 1, a deferring unit 2, a comparing unit 3, a mirror image detecting unit 4.
Detailed Description
Referring to fig. 1, the method for suppressing ping-pong reselection by the 5G terminal in the image detection manner 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, the following information of a cell which is separated during the reselection (namely, an original cell related to the reselection) is recorded, wherein the information is either reselection configuration parameter information of the separated cell or a necessary System Information Block (SIB) of the separated cell, or both the information; and simultaneously recording parameter information such as frequency points, cell identification codes and the like of the separated cells for distinguishing different cells, and taking the parameter information as information of a history 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.
The reselection configuration parameter information is recorded in an existing communication protocol. The 5G NR reselection configuration parameters are described in TS 38.304, and the 4G LTE reselection configuration parameters are described in TS 36.304, such as ThreshX, highQ, threshX-HighQ, threshX-LowQ, threshServingLowP, thressServeringLowQ, and the like.
For 4G LTE mobile communication networks, SIB1, SIB3, SIB4, SIB5, SIB6, SIB7, and SIB24 are the necessary system information blocks. For 5G NR mobile communication networks, SIB1, SIB2, SIB3, SIB4, SIB5 are the necessary system information blocks. The SIB is a bitstream encoded by asn.1 (Abstract Syntax Notation One ), and needs to be decoded to read related parameters, and a space required for storing decoded parameter information is relatively large. The necessary system information block can be an ASN.1 original code stream issued by a network, namely a bit stream received by a mobile terminal and not decoded by the ASN.1; or the information after the ASN.1 decoding.
Step S2: if the neighbor cell meets a certain reselection criterion specified by the existing communication protocol, the neighbor cell is called a fourth cell. For example, 5G NR reselection criteria are described in the TS 38.304 protocol, and 4G LTE reselection criteria are described in the TS 36.304 protocol. The mobile terminal temporarily does not use the fourth cell as a reselection candidate cell, and proceeds to step S3.
Step S3: the mobile terminal compares the information of the fourth cell with the recorded history service cell, for example, matches according to parameters such as frequency point, cell identification code and the like.
If the fourth cell is not in the historical service cell recorded by the mobile terminal, the mobile terminal considers that the reselection from the current service cell to the fourth cell is not possible to carry out ping-pong reselection, and the mobile terminal takes the fourth cell as a reselection candidate cell and allows the reselection process to the fourth cell to be carried out.
If the fourth cell is in the history service cell recorded by the mobile terminal, the process proceeds to step S4.
Step S4: the mobile terminal acquires the reselection configuration parameter information of the fourth cell or the necessary system information block of the fourth cell from the recorded information of the historical service cell. At this time, assuming that the mobile terminal currently resides in the fourth cell, regarding the current serving cell of the mobile terminal as the same frequency, different frequency, or different system neighbor cell of the fourth cell, and based on the reselection configuration parameter or the necessary system information block of the fourth cell, evaluating whether the mobile terminal currently meets the reselection criterion from the fourth cell to the current serving cell. The mirror image detection method provided by the invention is to take the target cell and the original cell which are actually reselected as the original cell and the target cell which are supposed to be reselected respectively, and analyze whether the supposed reselection meets a certain reselection criterion specified by the existing communication protocol.
If the mobile terminal currently meets a reselection criterion from the fourth cell to the current serving cell, the mobile terminal is considered to have a ping-pong reselection possibility from the current serving cell to the fourth cell. Accordingly, the mobile terminal does not use the fourth cell as a reselection candidate cell, and therefore the fourth cell does not become a reselection target cell, i.e., the reselection procedure to the fourth cell is suppressed.
If the mobile terminal does not currently meet all reselection criteria from the fourth cell to the current serving cell, the mobile terminal is considered to have no possibility of ping-pong reselection from the current serving cell to the fourth cell. Accordingly, the mobile terminal uses the fourth cell as a reselection candidate cell, allowing a reselection procedure to the fourth cell to be performed.
After the step S3 and the step S4 are executed, if only one reselection candidate cell exists, the mobile terminal executes a reselection process to the reselection candidate cell; if a plurality of reselection candidate cells exist at the same time, the mobile terminal selects one of the reselection candidate cells as a reselection target cell according to the existing communication protocol requirements, and performs a reselection process to the reselection target cell.
Optionally, in the step S4, if the mobile terminal currently meets a reselection criterion from the fourth cell to the current serving cell, and the signal strength of the fourth cell is greater than the sum of the signal strength of the current serving cell plus a preset sixth threshold, it is considered that there is no possibility of ping-pong reselection for the reselection of the mobile terminal from the current serving cell to the fourth cell. Accordingly, the mobile terminal uses the fourth cell as a reselection candidate cell, allowing a reselection procedure to the fourth cell to be performed. This paragraph means: even though there is a possibility of ping-pong reselection between the fourth cell and the current serving cell, since the fourth cell is stronger than the current serving cell, after the terminal resides in the fourth cell with the strong reselection signal for the first time, since the current serving cell is weaker than the fourth cell, the terminal will not reselect back to the current serving cell, and thus ping-pong reselection will not actually occur.
If in step S2 two neighbors are measured that meet a certain reselection criterion, i.e. two fourth cells. For example, the current serving cell of the mobile terminal is called a, and the fourth cell is called B1 and B2, respectively. Steps S3-S4 are first performed to determine A, B if there is a ping-pong reselection possibility between the two cells. Steps S3-S4 are then repeated to determine A, B if there is a ping-pong reselection possibility between the two cells.
Similarly, if m neighbor cells satisfying a certain reselection criterion are measured in step S2, that is, m is an integer greater than or equal to 2 in the fourth cell. For example, the current serving cell of the mobile terminal is called a, and the fourth cell is called B1, … …, bm, respectively. Steps S3-S4 are repeated m times, the first time to determine whether there is a ping-pong reselection possibility between the two cells A, B1, … …, and the mth time to determine A, bm whether there is a ping-pong reselection possibility between the two cells.
The steps S3-S4 are used to exclude the possibility of ping-pong reselection between two cells. If one of the neighbors that meets a certain reselection criterion is measured in step S2, referred to as a fourth cell, other neighbors are also measured, whether or not the other neighbors meet the reselection criterion, optionally, further excluding the possibility of a ping-pong reselection between multiple cells. For example, the current serving cell of the mobile terminal is called a, the fourth cell is called B, and the neighboring cell C is also included. The reselection conditions from a to C may or may not be satisfied. Ping-pong reselection between cells refers to: simultaneously satisfies the reselection condition of A- > B, B- > C, C- > A; although the reselection condition of B- > A is not satisfied, the reselection from A to B is immediately followed by the reselection from C back to A.
To exclude the possibility of ping-pong reselection between the A, B, C three cells, the steps S3-S4 need to be extended to the following form. (1) Step S3-step S4 are performed to determine A, B whether there is a ping-pong reselection possibility between two cells in a mirror detection manner. If the reselection from A to B does not have the possibility of a ping-pong reselection, then the next step is continued. (2) It is determined whether the mobile terminal currently meets a certain reselection criterion from B to C. If so, the next step is continued. (3) It is determined whether the mobile terminal currently meets a reselection criterion from C to a. If the judging results of the three items are yes, the mobile terminal is indicated to reselect C immediately after reselecting from A to B, and then reselect back to A immediately, so that the ping-pong reselection possibility exists among the three cells, and the mobile terminal does not take B as a reselection candidate cell. If any one or more of the above three judging results are 'no', it is indicated that the mobile terminal has no possibility of ping-pong reselection between A, B, C cells, and the mobile terminal takes B as a reselection candidate cell.
Referring to fig. 2, the 5G terminal for suppressing ping-pong reselection in a mirror detection manner according to the present invention includes a recording unit 1, a deferral unit 2, a comparing unit 3, and a mirror detection unit 4. The apparatus shown in fig. 2 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, the following information of a cell that leaves at the time of the reselection, either reselection configuration parameter information of the cell that leaves, or a necessary System Information Block (SIB) of the cell that leaves, or both of the information; as information of the history serving cell.
The deferring unit 2 is configured to find that a neighboring cell meets a reselection criterion specified by an existing communication protocol, and call the neighboring cell a fourth cell; the fourth cell is temporarily not taken as a reselection candidate cell.
The comparing unit 3 is arranged to compare the fourth cell with the recorded information of the history service cell. And if the fourth cell is not in the recorded historical service cell of the mobile terminal, taking the fourth cell as a reselection candidate cell.
The mirror image detection unit 4 is configured to obtain, when the fourth cell is in the recorded history service cell of the mobile terminal, reselection configuration parameter information of the fourth cell or a necessary system information block of the fourth cell from the recorded information of the history service cell; at this time, assuming that the mobile terminal currently resides in a fourth cell, regarding the current serving cell of the mobile terminal as a neighboring cell of the fourth cell, and evaluating whether the mobile terminal currently meets a reselection criterion from the fourth cell to the current serving cell based on a reselection configuration parameter or a necessary system information block of the fourth cell; if so, the fourth cell is not taken as a reselection candidate cell. Otherwise, the fourth cell is used as a reselection candidate cell.
According to the invention, through a mirror image mode, the actually reselected target cell and the current service cell are exchanged and then used as the assumed reselection for analysis and evaluation, whether the target cell is reselected back to the current service cell immediately after the target cell is reselected is judged, the ping-pong reselection can be detected, the ping-pong reselection is effectively restrained, the problems of voice or data service initiation delay, power consumption increase, called call rate reduction and the like caused by the ping-pong reselection are avoided, the problem of abnormal user perception caused by abnormal network reselection parameter configuration or insufficient network neighbor optimization can be also solved, and the user experience is improved.
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 in a mirror image detection mode is characterized by comprising the following steps of;
step S1: when the mobile terminal performs cell reselection each time, recording the following information of the cell which leaves at the time of reselection, namely, the reselection configuration parameter information of the cell which leaves, or the necessary system information block of the cell which leaves, or both information, as the information of a history service cell;
step S2: if the neighbor cell meets a certain reselection criterion specified by the existing communication protocol, the neighbor cell is called a fourth cell; the mobile terminal does not temporarily take the fourth cell as a reselection candidate cell;
step S3: the mobile terminal compares the information of the fourth cell with the recorded history service cell; if the fourth cell is not in the historical service cell recorded by the mobile terminal, the mobile terminal takes the fourth cell as a reselection candidate cell; otherwise, entering step S4;
step S4: the mobile terminal acquires the reselection configuration parameter information of the fourth cell and/or the necessary system information block of the fourth cell from the recorded information of the historical service cell; assuming that the mobile terminal currently resides in a fourth cell, regarding a current service cell of the mobile terminal as a neighboring cell of the fourth cell, and evaluating whether the mobile terminal currently meets a reselection criterion from the fourth cell to the current service cell based on a reselection configuration parameter and/or a necessary system information block of the fourth cell;
if the mobile terminal currently meets a certain reselection criterion from the fourth cell to the current service cell, the mobile terminal does not take the fourth cell as a reselection candidate cell; otherwise, the mobile terminal takes the fourth cell as a reselection candidate cell.
2. The method for suppressing ping-pong reselection by the 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 the 5G terminal in the mirror image detection manner according to claim 1, wherein in the step S1, the mobile terminal records the information of the cells that leave during N reselections in time sequence, called as 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 the 5G terminal in the image detection manner according to claim 1, wherein in step S1, the reselection configuration parameter information includes: 5G NR reselection configuration parameters described in the communication protocol TS 38.304 and 4G LTE reselection configuration parameters described in the communication protocol TS 36.304.
5. The method for suppressing ping-pong reselection by the 5G terminal in the mirror detection manner according to claim 1, wherein if the exiting cell is a 4G LTE cell, SIB1, SIB3, SIB4, SIB5, SIB6, SIB7 and SIB24 are necessary system information blocks in step S1; if the exiting cell is a 5G NR cell, SIB1, SIB2, SIB3, SIB4, SIB5 are the necessary system information blocks; the necessary system information block is either an ASN.1 original code stream issued by a network or information decoded by the ASN.1.
6. The method for suppressing ping-pong reselection by the 5G terminal in the mirror detection manner according to claim 1, wherein after the step S3 and the step S4 are performed, if there is only one reselection candidate cell, the mobile terminal performs a reselection procedure to the reselection candidate cell; if a plurality of reselection candidate cells exist at the same time, 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.
7. The method for suppressing ping-pong reselection by a 5G terminal according to claim 1, wherein in step S4, if the mobile terminal currently satisfies a reselection criterion from the fourth cell to the current serving cell, and the signal strength of the fourth cell is greater than the sum of the signal strength of the current serving cell plus a preset sixth threshold, the mobile terminal uses the fourth cell as a reselection candidate cell.
8. The method for suppressing ping-pong reselection by the image detection method of claim 1, wherein if m number of fourth cells are measured in step S2, m is an integer greater than or equal to 2, steps S3-S4 are repeatedly performed m times, each time for determining whether there is a possibility of ping-pong reselection between the current serving cell and one of the fourth cells.
9. The method for suppressing ping-pong reselection by the 5G terminal in the mirror detection manner according to claim 1, wherein if the fourth cell is measured in step S2, further other neighboring cells are measured, whether the other neighboring cells satisfy the reselection criterion or not, further excluding whether there is a possibility of ping-pong reselection among a plurality of cells or not; the steps S3-S4 are expanded into the following form;
firstly, executing step S3-step S4 to judge whether the possibility of ping-pong reselection exists between the current serving cell and the fourth cell in a mirror image detection mode; if the table tennis reselection possibility does not exist, continuing the next step;
then judging whether the mobile terminal currently meets a certain reselection criterion from the fourth cell to the other neighbor cells; if yes, continuing the next step;
then judging whether the mobile terminal currently meets a certain reselection criterion from the other neighbor cell to the current service cell; if the judging results of the three items are yes, the mobile terminal does not take the fourth cell as a reselection candidate cell; otherwise, the mobile terminal takes the fourth cell as a reselection candidate cell.
10. The 5G terminal for inhibiting ping-pong reselection in a mirror image detection mode is characterized by comprising a recording unit, a deferring unit, a comparing unit and a mirror image detection unit;
the recording unit is used for recording the following information of the cell which is separated when the mobile terminal performs cell reselection every time, namely, the information of the separated cell reselection configuration parameter, the necessary system information block of the separated cell, or both the information as the information of the history service cell;
the deferring unit is used for finding that the neighbor cell meets a certain reselection criterion specified by the existing communication protocol, and the neighbor cell is called as a fourth cell; temporarily not taking the fourth cell as a reselection candidate cell;
the comparing unit is used for comparing the information of the fourth cell with the recorded history service cell; if the fourth cell is not in the recorded history service cell of the mobile terminal, the fourth cell is used as a reselection candidate cell;
the mirror image detection unit is used for acquiring reselection configuration parameter information of the fourth cell and/or necessary system information blocks of the fourth cell from the recorded information of the historical service cell when the fourth cell is in the recorded historical service cell of the mobile terminal; assuming that the mobile terminal currently resides in a fourth cell, regarding a current service cell of the mobile terminal as a neighboring cell of the fourth cell, and evaluating whether the mobile terminal currently meets a reselection criterion from the fourth cell to the current service cell based on a reselection configuration parameter and/or a necessary system information block of the fourth cell; if so, the fourth cell is not taken as a reselection candidate cell. Otherwise, the fourth cell is used as a reselection candidate cell.
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