CN110418388B - Cell reselection control method and device and mobile terminal - Google Patents
Cell reselection control method and device and mobile terminal Download PDFInfo
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- CN110418388B CN110418388B CN201910778798.5A CN201910778798A CN110418388B CN 110418388 B CN110418388 B CN 110418388B CN 201910778798 A CN201910778798 A CN 201910778798A CN 110418388 B CN110418388 B CN 110418388B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00835—Determination of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00837—Determination of triggering parameters for hand-off
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00837—Determination of triggering parameters for hand-off
- H04W36/008375—Determination of triggering parameters for hand-off based on historical data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a cell reselection control method, a cell reselection control device and a mobile terminal, and relates to the technical field of communication, wherein the cell reselection control method comprises the following steps: when the mobile terminal reselects to the current service cell, recording cell reselection information corresponding to the current service cell; the cell reselection information includes: the identification of the last resident cell, the identification of the current service cell, and the continuous reselection times between the last resident cell and the current service cell; if the continuous reselection times are larger than a preset threshold value, judging whether the cell reselection priorities corresponding to the current serving cell and the last resident cell are consistent or not; and if the current service cell and the cell reselection priority of the last resident cell are not consistent, setting the cell reselection priorities of the current service cell and the last resident cell to be consistent so that the mobile terminal performs cell reselection based on a preset reselection criterion with the same priority. The invention can avoid the repeated reselection process between the current service cell and the last resident cell, reduce the power consumption of the mobile terminal, keep the signal stability of the mobile terminal and improve the user experience.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for controlling cell reselection, and a mobile terminal.
Background
Under the LTE network environment, when the cell-phone is in certain signal interval of two LTE district coverage, because the district reselection priority setting of two LTE districts is different, can lead to the cell-phone to reselect at the ping-pong between two LTE districts, frequent district changes, can frequently awaken up and inform cell upper APP district change, lead to cell-phone signal unstability and unable normal standby dormancy, cell-phone power consumption is serious, and when two LTE districts of reselecting at the ping-pong belong to different tracking area code lists, tracking area update process can be triggered to every district change, can increase network signaling burden, influence the capacity of network, also can further aggravate cell power consumption simultaneously, lead to the cell-phone to appear scalding the problem.
Disclosure of Invention
The invention aims to provide a cell reselection control method, a cell reselection control device and a mobile terminal, so as to solve the technical problems of unstable mobile terminal signals and serious power consumption caused by ping-pong reselection of the mobile terminal between two cells in the prior art.
The invention provides a cell reselection control method, which is applied to a mobile terminal and comprises the following steps: when the mobile terminal reselects to the current service cell, recording cell reselection information corresponding to the current service cell; wherein the cell reselection information comprises: the identification of the last resident cell, the identification of the current service cell, and the continuous reselection times between the last resident cell and the current service cell; if the continuous reselection times are larger than a preset threshold value, judging whether the cell reselection priorities corresponding to the current serving cell and the last resident cell are consistent or not; and if the current service cell and the cell reselection priority of the last resident cell are not consistent, setting the cell reselection priorities of the current service cell and the last resident cell to be consistent so that the mobile terminal can perform cell reselection based on a preset reselection criterion with the same priority.
Further, the step of recording cell reselection information corresponding to the current serving cell includes: recording the identifier of the last resident cell and the identifier of the current service cell; detecting whether the cell corresponding to the last recorded continuous reselection times is a last resident cell and a current service cell; if yes, adding 1 to the continuous reselection times; if not, clearing the continuous reselection times, and recording the continuous reselection times of the last resident cell and the current service cell as 1 again.
Further, the method further comprises: and if the continuous reselection times are larger than a preset threshold value, determining that a ping-pong reselection event occurs between the current serving cell and the last resident cell.
Further, the step of setting the cell reselection priorities of the current serving cell and the last resident cell to be consistent includes: setting the cell reselection priority of the current serving cell as the cell reselection priority of the last resident cell; or setting the cell reselection priority of the last resident cell as the cell reselection priority of the current serving cell.
Further, the preset same priority reselection criteria include: if the duration of the rankine value of the last resident cell is larger than the rankine value of the current service cell reaches the reselection time threshold, reselecting the last resident cell by the current service cell; if the duration time does not reach the reselection time threshold value, residing in the current service cell; wherein, the Ranking value Rs of the current service cell is Qmeas, s + Qhyst; the Ranking value Rn of the last resident cell is Qmeas, n + Qoffset; qmeas, s and Qmeas, n are the signal strength of the current serving cell and the last resident cell, respectively; qhyst is a cell reselection hysteresis value; qoffset is the cell offset.
Further, when the mobile terminal reselects the current serving cell, before the step of recording cell reselection information corresponding to the current serving cell, the method further includes: periodically acquiring cell reselection parameters and signal strengths of an initial serving cell and a plurality of adjacent cells; the cell reselection parameters include: a cell reselection priority; performing cell reselection based on the cell reselection parameters, the signal strength and a preset cell reselection criterion; the cell reselection criteria include: a high priority reselection criterion, a same priority reselection criterion, and a low priority criterion.
Further, the current serving cell and the last cell of camping are both LTE cells or both 5G cells.
The invention also provides a cell reselection control device, which is applied to a mobile terminal and comprises: the information recording module is used for recording cell reselection information corresponding to the current serving cell when the mobile terminal reselects the current serving cell; wherein the cell reselection information comprises: the identification of the last resident cell, the identification of the current service cell, and the continuous reselection times between the last resident cell and the current service cell; the judging module is used for judging whether cell reselection priorities corresponding to the current serving cell and the last resident cell are consistent or not if the continuous reselection times are larger than a preset threshold value; and the priority setting module is used for setting the cell reselection priorities of the current serving cell and the last resident cell to be consistent if the current serving cell and the last resident cell are inconsistent, so that the mobile terminal performs cell reselection based on a preset reselection criterion with the same priority.
Further, the information recording module is further configured to: recording the identifier of the last resident cell and the identifier of the current service cell; detecting whether the cell corresponding to the last recorded continuous reselection times is a last resident cell and a current service cell; if yes, adding 1 to the continuous reselection times; if not, clearing the continuous reselection times, and recording the continuous reselection times of the last resident cell and the current service cell as 1 again.
Further, the above apparatus further comprises: and the ping-pong reselection determining module is used for determining that a ping-pong reselection event occurs between the current serving cell and the last resident cell if the continuous reselection times is greater than a preset threshold value.
Further, the priority setting module is further configured to: setting the cell reselection priority of the current serving cell as the cell reselection priority of the last resident cell; or setting the cell reselection priority of the last resident cell as the cell reselection priority of the current serving cell.
Further, the above apparatus further comprises: the information acquisition module is used for periodically acquiring cell reselection parameters and signal strengths of an initial serving cell and a plurality of adjacent cells; the cell reselection parameters include: a cell reselection priority; the cell reselection module is used for reselecting the cell based on the cell reselection parameters, the signal strength and a preset cell reselection criterion; the cell reselection criteria include: a high priority cell reselection criterion, a same priority cell reselection criterion, and a low priority cell reselection criterion.
The invention also provides a mobile terminal, which comprises a mobile terminal body; the mobile terminal body is provided with the control device for cell reselection.
The cell reselection control method, the cell reselection control device and the mobile terminal provided by the invention can record cell reselection information corresponding to a current serving cell when the mobile terminal performs cell reselection; the cell reselection information includes the number of times of continuous reselection between the last resident cell and the current serving cell. When the continuous reselection frequency is judged to be larger than a preset threshold value, further judging whether the cell reselection priorities corresponding to the current service cell and the last resident cell are consistent or not; if the cell reselection priorities are not consistent, the same cell reselection priority is automatically set, so that the mobile terminal can stay in the cell with stronger signal intensity for a long time and does not repeatedly reselect between the current serving cell and the cell staying last time when reselecting the cell based on the reselection criterion with the same priority, the power consumption of the mobile terminal is reduced, the signal stability of the mobile terminal is kept, and the user experience is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for controlling cell reselection according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for controlling cell reselection according to an embodiment of the present invention to record cell reselection information;
fig. 3 is a flowchart illustrating a method for detecting ping-pong reselection in an LTE system according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating an update of a number of consecutive reselections according to an embodiment of the present invention;
fig. 5 is a flowchart of another cell reselection control method according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a control apparatus for cell reselection according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another cell reselection control apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present 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.
Currently, in an LTE network environment, when a mobile terminal is located in a certain signal interval between coverage areas of an LTE cell a (hereinafter referred to as an a cell) and an LTE cell B (hereinafter referred to as a B cell), ping-pong reselection of a mobile phone between the a cell and the B cell may be caused due to different reselection priorities of the a cell and the B cell, that is, when the mobile phone resides in the a cell, the B cell may be reselected based on the cell reselection priorities of the two cells and a cell reselection criterion. Then based on the cell reselection priorities and cell reselection criteria of the two cells, reselecting from the cell B to the cell A, and getting into circulation.
Such as: respectively corresponding signal intensities of a cell A and a cell B measured by the mobile terminal are-90 dBm and-108 dBm; meanwhile, cell reselection parameters corresponding to the cell A and the cell B respectively serving as a current serving cell are also obtained, wherein the cell reselection parameters comprise cell reselection priorities and other parameters corresponding to the current serving cell and a target neighboring cell respectively; when the serving cell is a cell a, the priority of the target neighboring cell B is greater than that of the serving cell a, and two conditions specified by a high-priority reselection criterion are met, so that the cell reselection result is: reselecting from a serving cell A cell to a target neighbor cell B cell; when the serving cell is the cell B, the priority of the target neighboring cell a is equal to that of the serving cell B, and two conditions specified by the reselection criterion with the same priority are satisfied, so that the cell reselection result is: and reselecting the target neighbor cell A from the serving cell B cell. And so on, when the next cell reselection is performed, the mobile terminal reselects from the cell a to the cell B, and then reselects from the cell B to the cell a, and so on, which cycles to cause a ping-pong reselection event.
And the LTE cell ping-pong reselection, frequent cell change, can frequently awaken and inform the change of the APP cell on the upper layer of the mobile phone, which results in the unstable signal of the mobile phone and the abnormal standby dormancy, the power consumption of the mobile phone is serious, and when two cells of the ping-pong reselection belong to different tracking area code lists, the update process of the tracking area can be triggered by the cell change every time, the network signaling burden can be increased, the capacity of the network is influenced, the power consumption of the mobile phone can be further aggravated, and the problem that the mobile phone is scalded is caused.
Based on this, embodiments of the present invention provide a cell reselection control method, an apparatus, and a mobile terminal, so as to alleviate technical problems in the prior art that a mobile terminal signal is unstable and power consumption is severe due to ping-pong reselection of the mobile terminal between two cells.
For the convenience of understanding the present embodiment, a detailed description will be first given of a cell reselection control method disclosed in the present embodiment.
The cell reselection control method provided by the embodiment of the invention is applicable to an application scene of a 5G network or an LTE network, or can be applied to a reselection process of the 5G cell or the LTE cell, and an execution main body of the method is a mobile terminal, such as a mobile phone, a computer or an iPad. Fig. 1 shows a flowchart of a method for controlling cell reselection according to an embodiment of the present invention, where an LTE cell is taken as an example for description in the embodiment of the present invention, and the method specifically includes the following steps:
step S102, when the mobile terminal reselects the current service cell, recording cell reselection information corresponding to the current service cell, wherein the cell reselection information comprises: the identification of the last resident cell, the identification of the current service cell, and the continuous reselection times between the last resident cell and the current service cell.
Generally, after the Mobile terminal is powered on, a suitable cell is selected from a selected PLMN (Public Land Mobile Network) for camping, and after the Mobile terminal camps in a certain cell, the Mobile terminal may receive system messages and cell broadcast information. The handset may then remain in idle mode until an RRC (Radio Resource Control) connection needs to be established. The mobile terminal, whether in RRC idle mode or RRC connected mode, needs to monitor the signal quality, such as signal strength, of the current serving cell and neighboring cells at any time to select a most suitable cell to camp on, and then a cell reselection procedure may occur.
Taking the above-mentioned cell a and cell B as an example, when the mobile terminal reselects from the cell a to the cell B, the cell B becomes the current serving cell, and the cell a becomes the last resident cell, and when the mobile terminal reselects from the current serving cell B, the cell reselection information corresponding to the current serving cell B can be recorded at the same time, which specifically includes: the identification of the last resident cell A, the identification of the current service cell B, and the continuous reselection times between the last resident cell A and the current service cell B.
For example, the first cell reselection is: from the cell A to the cell B, the continuous reselection frequency between the cell A and the cell B is 1; the second cell reselection is as follows: from the cell B to the cell A, the continuous reselection frequency between the cell B and the cell A is 1; the third cell reselection is as follows: from the cell A to the cell B, the continuous reselection frequency between the cell A and the cell B is 2; the fourth cell reselection is: from the cell B to the cell A, the continuous reselection frequency between the cell B and the cell A is 2; the fifth cell reselection is: from the cell A to the cell B, the continuous reselection frequency between the cell A and the cell B is 3; … … and so on.
And step S104, if the continuous reselection times is larger than a preset threshold value, judging whether the cell reselection priorities corresponding to the current service cell and the last resident cell are consistent.
After the cell reselection information corresponding to the current serving cell is recorded, comparing the continuous reselection times in the cell reselection information with a preset threshold value, and if the continuous reselection times is larger than the preset threshold value, further judging whether cell reselection priorities corresponding to the current serving cell and a last resident cell are consistent. For example, when the current serving cell is a cell a, the cell reselection priority of the cell a is 6, and the cell reselection priority of the last resident cell B, that is, the cell reselection priority of the target LTE neighboring cell B, is 7, in this case, the cell reselection priorities corresponding to the current serving cell and the last resident cell, respectively, are not the same; when the current serving cell is the cell B, the cell reselection priority of the cell B is 6, and the cell reselection priority of the last resident cell a, that is, the cell reselection priority of the target LTE neighboring cell a, is 6.
And step S106, if the current service cell and the cell reselection priority of the last resident cell are not consistent, setting the cell reselection priorities of the current service cell and the last resident cell to be consistent so that the mobile terminal performs cell reselection based on a preset reselection criterion with the same priority.
And then, in the last step, when the current serving cell is the cell A, the cell reselection priority of the cell A is inconsistent with the cell reselection priority of the cell B which is resided last time, and at this time, the mobile terminal automatically sets the cell reselection priorities of the cell A and the cell B to be consistent. At this time, the mobile terminal performs cell reselection based on the preset reselection criterion with the same priority, and because the cell reselection priorities of the two cells are consistent and the signal strength of the cell a is greater than that of the cell B, the mobile terminal resides in the cell a with the relatively greater signal strength for a long time without further cell reselection under the condition of meeting other reselection conditions with the same priority, thereby avoiding the serious power consumption problem and the unstable signal problem of the mobile terminal caused by continuous repeated reselection between the cell a and the cell B.
The cell reselection control method provided by the embodiment of the invention can record the cell reselection information corresponding to the current service cell when the mobile terminal performs cell reselection; the cell reselection information includes the number of times of continuous reselection between the last resident cell and the current serving cell. When the continuous reselection frequency is judged to be larger than a preset threshold value, further judging whether the cell reselection priorities corresponding to the current service cell and the last resident cell are consistent or not; if the cell reselection priorities are not consistent, the same cell reselection priority is automatically set, so that the mobile terminal can stay in the cell with higher signal strength for a long time and does not repeatedly reselect between the current serving cell and the cell staying last time when reselecting the cell based on the reselection criterion with the same priority, the power consumption of the mobile terminal is reduced, the signal stability of the mobile terminal is kept, and the user experience is improved.
The method further comprises the following steps: and if the continuous reselection times are larger than a preset threshold value, determining that a ping-pong reselection event occurs between the current serving cell and the last resident cell. That is to say, when a ping-pong reselection event occurs between the current serving cell and the last resident cell, it is further determined whether cell reselection priorities respectively corresponding to the current serving cell and the last resident cell are consistent, and when the cell reselection priorities are not consistent, the cell reselection priorities of the current serving cell and the last resident cell are set to be consistent, so that the mobile terminal performs cell reselection based on a preset same priority reselection criterion subsequently, and the above effects can also be achieved.
In the process of cell reselection by the mobile terminal, it is one of the very critical steps to accurately record the number of consecutive reselections, and for the case that only two cells are repeatedly reselected, the recording process of the cell reselection information is shown in fig. 2, and specifically includes the following steps:
step S202, record the mark of the last resident district and the mark of the present service district.
If the identity of the current serving cell is recorded as a, the identity of the last resident cell is recorded as B, i.e. B — > a.
Step S204, whether the cell corresponding to the last recorded continuous reselection time is the last resident cell and the current service cell is detected.
It should be noted that the number of consecutive reselections between a and B is different from the number of consecutive reselections between B and a. The number of consecutive reselections is calculated based on having the same last camped cell.
If the last recorded continuous reselection time is 2, the corresponding cell is: the current serving cell a, the last resident cell B, and obviously, the last recorded cell is B — > a as the cell recorded this time, in this case, step S206 is executed, and the number of consecutive reselections is added by 1, that is, the number of consecutive reselections of B — > a is 3.
If the last recorded continuous reselection time is 2, the corresponding cell is: in the case that the current serving cell a and the last resident cell C are obviously different from the cell recorded last time and the cell recorded this time, step S208 is executed to zero the continuous reselection times and to re-record the continuous reselection times of the last resident cell and the current serving cell as 1. Namely, the number of consecutive reselections for C- > A recorded before becomes 0, and the number of consecutive reselections for B- > A recorded before becomes 1.
For a specific implementation process, referring to a preferred implementation manner, as shown in fig. 3, a flowchart for recording cell reselection information for an information recording module according to an embodiment of the present invention is provided, where the specific flow is as follows:
the cell where the mobile terminal initially resides is a current serving cell A, and at the moment, the cell where the mobile terminal previously resides is empty;
for the first time of cell reselection, reselecting an LTE cell A to an LTE cell B, updating the continuous reselection times of the cell reselection A to B to be 1, and entering the next cell reselection;
the second time of cell reselection, the LTE cell B reselects the LTE cell A, the continuous reselection times of the updated cell reselection B-A is 1, and the next cell reselection is carried out;
the third time of cell reselection, the LTE cell A reselects the LTE cell B, the continuous reselection times of the updated cell reselection A-B is 2, and the next cell reselection is carried out;
the fourth time of cell reselection, the LTE cell B reselects the LTE cell A, the continuous reselection times of the updated cell reselection B-A is 2, and the next cell reselection is carried out;
and (4) performing fifth cell reselection, namely reselecting the LTE cell A to the LTE cell B, updating the continuous reselection times of the cell reselection A-B to be 3, and judging that a ping-pong reselection event between the cell A and the cell B currently occurs when the continuous reselection times is larger than a preset ping-pong reselection time threshold value, namely the preset threshold value is 2.
When the cell reselection times, i.e. the continuous reselection times, are recorded, the continuous reselection times between the previous two cells will be cleared when the intermediate cell changes. If the fourth cell reselection is assumed to be B- > C, the previously counted A- > B and B- > A continuous reselection times are cleared, and the updated B- > C continuous reselection times are 1. As shown in fig. 4, numbers 1, 2 and 3 in the figure are statistics of the number of reselections of two cells.
When it is detected that a ping-pong reselection event occurs, that is, the number of times of continuous reselection between the two cells exceeds a preset threshold value, it is further determined whether the cell reselection priorities of the two cells are consistent, if so, cell reselection is performed according to a reselection criterion with the same priority, and if not, the cell reselection priorities of the two cells are set to be the same, and the specific setting manner may be: setting the cell reselection priority of the current serving cell as the cell reselection priority of the last resident cell; or setting the cell reselection priority of the last resident cell as the cell reselection priority of the current serving cell.
Further, the preset same priority reselection criteria include: if the duration of the rankine value of the last resident cell is larger than the rankine value of the current service cell reaches the reselection time threshold, reselecting the last resident cell by the current service cell; if the duration time does not reach the reselection time threshold value, residing in the current service cell; wherein, the Ranking value Rs of the current service cell is Qmeas, s + Qhyst; the Ranking value Rn of the last resident cell is Qmeas, n + Qoffset; qmeas, s and Qmeas, n are the signal strength of the current serving cell and the last resident cell, respectively; qhyst is a cell reselection hysteresis value; qoffset is the cell offset.
Before the step of recording, by the mobile terminal, cell reselection information corresponding to a current serving cell, a conventional cell reselection process is further included, which is specifically shown in fig. 5:
step S502, cell reselection parameters and signal strengths of the initial serving cell and a plurality of neighboring cells are periodically obtained.
After the mobile terminal is powered on, the mobile terminal selects a suitable cell from the selected PLMN for camping. During the initial cell selection process, the mobile terminal will scan all radio frequency channels to find a suitable cell. The mobile terminal on each carrier frequency only needs to search the cell with the strongest signal, then tunes to the frequency point with the highest signal strength, reads the system information on the BCH broadcast channel, and then judges whether the cell belongs to the selected network, whether the cell is forbidden, whether the S value of the cell is greater than 0 and other information according to the read system information, namely whether the cell meets the LTE cell selection S criterion. If both are satisfied then the mobile terminal will camp on the cell. When the mobile terminal resides in a certain cell, the system message and the cell broadcast information can be received. The mobile terminal may then remain in idle mode until an RRC connection needs to be established.
The LTE cell selection S criteria are as follows:
the mobile terminal selects and camps on a certain LTE cell to meet the cell selection S criteria. And the mobile terminal calculates the Srxlev value according to the cell selection parameters configured by the cell and the measured signal strength, and when Srxlev is greater than 0, the mobile terminal judges that the S criterion of the cell selection is met. Srxlev is specifically calculated as shown below:
Srxlev＝Qrxlevmeas-(Qrxlevmin+Qrxlevminoffset)-Pcompensation；
Pcompensation＝MAX(PEMAX-PUMAX,0)；
wherein Srxlev selects a receiving level value for the cell; qrxlevmeas is the RSRP value of the target cell measured by the UE and has a unit dB; qrxlevmeas is the RSRP value of the target cell measured by the UE and has a unit dB; the Qrxlevminoffset is the deviation of the signaling Qrxlevmin considered by periodically searching a high-priority PLMN to evaluate the Qrxlev when the mobile terminal normally resides; PEMAX is the maximum usable transmitting power of the UE uplink; and the PUMAX is the maximum radio frequency output power of the mobile terminal.
The mobile terminal, whether in RRC idle mode or RRC connected mode, needs to monitor the signal quality of the serving cell and neighboring cells at any time to select a most suitable cell to camp on. Therefore, after the mobile terminal resides in a certain cell, that is, the initial serving cell, the cell reselection parameters and the signal strengths of the initial serving cell and a plurality of neighboring cells are periodically detected, so that the mobile terminal performs cell reselection according to the cell reselection parameters, the signal strengths and a preset cell reselection criterion.
Step S504, based on the cell reselection parameters, the signal strength and the preset cell reselection criteria, cell reselection is performed.
The mobile terminal finds that the adjacent cells meet reselection conditions through periodic measurement in an RRC idle state, and then cell reselection is triggered. The cell reselection criteria of the mobile terminal are 3 types: a high priority cell reselection criterion, a same priority cell reselection criterion, and a low priority cell reselection criterion.
(1) High priority cell reselection criteria:
when the cell reselection priority of the inter-frequency/RAT target neighboring cell is higher than the cell reselection priority of the serving cell, triggering cell reselection based on the high priority when the following conditions are met:
target neighbor cell satisfaction within treselectionerrat time:
SnonServingCell,x>Threshx,high；
wherein, treselection rat is cell reselection time, and time lag required to be met by reselection of LTE neighboring cells; SnonServingCell, x is the Srxlev value of the cell; threshx, high is an LTE high priority reselection threshold, that is, a high threshold of an LTE cell frequency point with higher priority than a service frequency point is reselected.
(2) Cell reselection criteria with same priority:
and the cell reselection with the same priority adopts a Ranking criterion: cell Ranking is defined as follows:
Rs＝Qmeas,s+Qhyst；
Rn＝Qmeas,n+Qoffset；
wherein Rs is a Ranking value of the current serving cell, and Rn is a Ranking value of the neighboring cell. Qmeas, s and Qmeas, n are the signal strength of the current serving cell and the neighboring cell, respectively; qhyst is a cell reselection hysteresis value; qoffset is the cell offset.
When continuously measured Rn > Rs is met and TreselectionRAT is reached, cell reselection of the same priority is prompted.
(3) Low priority cell reselection criteria
Facilitating low priority based cell reselection when:
continuously measuring the time when Sseervingcell < Thresherging, low and Snonservingcell, x > Threshx, low reaches TreselectionRAT;
wherein, Snonservingcell, x is the Srxlev value of the cell; threshx, low is the LTE low priority reselection threshold.
Based on the cell selection S criteria and the cell reselection criteria, the mobile terminal may perform timely cell reselection to camp on a more suitable cell and keep the signal stable.
The cell reselection control method provided by the embodiment of the invention can record the cell reselection information corresponding to the current service cell when the mobile terminal performs cell reselection; the cell reselection information includes the number of times of continuous reselection between the last resident cell and the current serving cell. When the continuous reselection frequency is judged to be larger than a preset threshold value, further judging whether the cell reselection priorities corresponding to the current service cell and the last resident cell are consistent or not; if the cell reselection priorities are not consistent, the same cell reselection priority is automatically set, so that the mobile terminal can stay in the cell with stronger signal intensity for a long time and does not repeatedly reselect between the current serving cell and the cell staying last time when reselecting the cell based on the reselection criterion with the same priority, the power consumption of the mobile terminal is reduced, the signal stability of the mobile terminal is kept, and the user experience is improved.
Based on the foregoing method embodiment, an embodiment of the present invention further provides a control device for cell reselection, where fig. 6 is a schematic structural diagram of the control device for cell reselection, where the control device is applied to a mobile terminal, and includes: an information recording module 602, a judging module 604 and a priority setting module 606.
The information recording module 602 is configured to record cell reselection information corresponding to a current serving cell when the mobile terminal reselects the current serving cell; wherein the cell reselection information comprises: the identification of the last resident cell, the identification of the current service cell, and the continuous reselection times between the last resident cell and the current service cell; a determining module 604, configured to determine whether cell reselection priorities corresponding to the current serving cell and the last resident cell are consistent if the number of consecutive reselections is greater than a preset threshold; a priority setting module 606, configured to set, if the cell reselection priorities of the current serving cell and the cell camped last time are inconsistent, the cell reselection priority of the current serving cell and the cell camped last time is consistent, so that the mobile terminal performs cell reselection based on a preset reselection criterion with the same priority.
The control device for cell reselection provided by the embodiment of the invention can record cell reselection information corresponding to a current serving cell when the mobile terminal performs cell reselection; the cell reselection information includes the number of times of continuous reselection between the last resident cell and the current serving cell. When the continuous reselection frequency is judged to be larger than a preset threshold value, further judging whether the cell reselection priorities corresponding to the current service cell and the last resident cell are consistent or not; if the cell reselection priorities are not consistent, the same cell reselection priority is automatically set, so that the mobile terminal can stay in the cell with stronger signal intensity for a long time and does not repeatedly reselect between the current serving cell and the cell staying last time when reselecting the cell based on the reselection criterion with the same priority, the power consumption of the mobile terminal is reduced, the signal stability of the mobile terminal is kept, and the user experience is improved.
In addition, fig. 7 also shows a schematic structural diagram of another control apparatus for cell reselection according to an embodiment of the present invention, which includes, in addition to an information recording module 702, a determining module 704 and a priority setting module 706 similar to the previous embodiment: a ping-pong reselection determination module 708, an information acquisition module 710, and a cell reselection module 712.
The ping-pong reselection determining module 708 is configured to determine that a ping-pong reselection event occurs between the current serving cell and the cell camped last time if the number of consecutive reselections is greater than a preset threshold. An information obtaining module 710, configured to periodically obtain cell reselection parameters and signal strengths of an initial serving cell and a plurality of neighboring cells; the cell reselection parameters include: a cell reselection priority; a cell reselection module 712, configured to perform cell reselection based on the cell reselection parameter, the signal strength, and a preset cell reselection criterion; the cell reselection criteria include: a high priority reselection criterion, a same priority reselection criterion, and a low priority criterion.
Further, the information recording module 702 is further configured to: recording the identifier of the last resident cell and the identifier of the current service cell; detecting whether the cell corresponding to the last recorded continuous reselection times is a last resident cell and a current service cell; if yes, adding 1 to the continuous reselection times; if not, clearing the continuous reselection times, and recording the continuous reselection times of the last resident cell and the current service cell as 1 again.
Further, the priority setting module 706 is further configured to: setting the cell reselection priority of the current serving cell as the cell reselection priority of the last resident cell; or setting the cell reselection priority of the last resident cell as the cell reselection priority of the current serving cell.
The control device for cell reselection provided by the embodiment of the invention can record cell reselection information corresponding to a current serving cell when the mobile terminal performs cell reselection; the cell reselection information includes the number of times of continuous reselection between the last resident cell and the current serving cell. When the continuous reselection frequency is judged to be larger than a preset threshold value, further judging whether the cell reselection priorities corresponding to the current service cell and the last resident cell are consistent or not; if the cell reselection priorities are not consistent, the same cell reselection priority is automatically set, so that the mobile terminal can stay in the cell with stronger signal intensity for a long time and does not repeatedly reselect between the current serving cell and the cell staying last time when reselecting the cell based on the reselection criterion with the same priority, the power consumption of the mobile terminal is reduced, the signal stability of the mobile terminal is kept, and the user experience is improved.
An embodiment of the present invention further provides a mobile terminal, where the mobile terminal is provided with the above-mentioned cell reselection control device, and fig. 8 shows a schematic diagram of the mobile terminal. The mobile terminal includes a Radio Frequency (RF) circuit 810, a memory 820, an input unit 830, a display unit 840, a sensor 850, an audio circuit 860, a wireless fidelity (WiFi) module 870, a processor 880, a power supply 890, and the like, and the functions of the above-described control apparatus for cell reselection may be implemented by a combination of these components.
For convenience of explanation, fig. 8 shows only portions related to the embodiment of the present invention. It should be understood that the configuration of the mobile terminal shown in fig. 8 is not intended to be limiting of the mobile terminal and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
The following describes each component of the mobile terminal in detail with reference to fig. 8:
the RF circuit 810 is used for receiving and transmitting signals during information transmission and reception or during a call, and particularly, receives downlink information of a base station and then processes the downlink information to the processor 880; uplink data may also be transmitted to the base station. Typically, the RF circuitry includes, but is not limited to, an antenna, at least one Amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like.
The memory 820 may be used to store software programs and modules, such as the method for adjusting the antenna radiation performance and the program instructions/modules corresponding to the mobile terminal in the embodiment of the present invention, and the processor 880 executes various functional applications and data processing of the mobile terminal, such as the method for adjusting the antenna radiation performance provided in the embodiment of the present invention, by executing the software programs and modules stored in the memory 820. The memory 820 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the mobile terminal, and the like. Further, the memory 820 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The input unit 830 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the mobile terminal. Specifically, the input unit 830 may include a touch panel 831, such as a touch screen, and other input devices 832, and the other input devices 832 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like.
The display unit 840 may be used to display information input by a user or information provided to the user and various menus of the mobile terminal. The Display unit 840 may include a Display panel 841, and the Display panel 841 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like, as an option. Further, the touch panel 831 can cover the display panel 841, and when the touch panel 831 detects a touch operation thereon or nearby, the touch panel can transmit the touch operation to the processor 880 to determine the type of the touch event, and then the processor 880 can perform processing according to the type of the touch event. Although in fig. 8, the touch panel 831 and the display panel 841 are two separate components to implement the input and output functions of the mobile terminal, in some embodiments, the touch panel 831 and the display panel 841 may be integrated to implement the input and output functions of the mobile terminal.
The mobile terminal may also include at least one sensor 850, such as a light sensor, motion sensor, and other sensors.
WiFi belongs to short-distance wireless transmission technology, and the mobile terminal can help the user send and receive e-mail, browse web page and access streaming media, etc. through WiFi module 870, which provides wireless broadband internet access for the user. Although fig. 8 shows WiFi module 870, it is understood that it does not belong to the essential constitution of the mobile terminal, and may be omitted entirely as needed within the scope not changing the essence of the invention.
The processor 880 is a control center of the mobile terminal, connects various parts of the entire mobile terminal using various interfaces and lines, and performs various functions of the mobile terminal and processes data by operating or executing software programs and/or modules stored in the memory 820 and calling data stored in the memory 820, thereby integrally monitoring the mobile terminal. Optionally, processor 880 may include one or more processing units; preferably, the processor 880 may integrate an application processor, which mainly handles operating systems, user interfaces, applications, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into processor 880.
The mobile terminal also includes a power supply 890 (e.g., a battery) for powering the various components, which may be logically connected to the processor 880 via a power management system that may be used to manage charging, discharging, and power consumption.
It will be appreciated that the configuration shown in fig. 8 is merely illustrative, and that the mobile terminal may include more or fewer components than shown in fig. 8, or may have a different configuration than shown in fig. 8. The components shown in fig. 8 may be implemented in hardware, software, or a combination thereof.
The method and apparatus for controlling cell reselection and the computer program product of the mobile terminal provided in the embodiments of the present invention include a computer-readable storage medium storing a program code, where instructions included in the program code may be used to execute the method described in the foregoing method embodiments, and specific implementation may refer to the method embodiments, and will not be described herein again.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the mobile terminal and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the following embodiments are merely illustrative of the present invention, and not restrictive, and the scope of the present invention is not limited thereto: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. A control method for cell reselection, the method being applied to a mobile terminal and comprising:
when the mobile terminal reselects to the current service cell, recording cell reselection information corresponding to the current service cell; wherein the cell reselection information comprises: the identification of the last resident cell, the identification of the current service cell, and the continuous reselection times between the last resident cell and the current service cell;
if the continuous reselection times are larger than a preset threshold value, judging whether cell reselection priorities corresponding to the current serving cell and the last resident cell are consistent or not;
if not, setting the cell reselection priorities of the current serving cell and the last resident cell to be consistent so that the mobile terminal performs cell reselection based on a preset same priority reselection criterion, wherein the preset same priority reselection criterion comprises: if the duration of the rankine value of the last resident cell is larger than the rankine value of the current serving cell reaches a reselection time threshold, reselecting the last resident cell from the current serving cell; if the duration time does not reach the reselection time threshold, residing in the current serving cell;
wherein the Ranking value Rs of the current serving cell is Qmeas, s + Qhyst;
the Ranking value Rn of the last resident cell is Qmeas, n + Qoffset;
qmeas, s and Qmeas, n are the signal strengths of the current serving cell and the last resident cell, respectively; qhyst is a cell reselection hysteresis value; qoffset is the cell offset.
2. The method of claim 1, wherein the step of recording cell reselection information corresponding to the current serving cell comprises:
recording the identifier of the last resident cell and the identifier of the current service cell;
detecting whether the cell corresponding to the last recorded continuous reselection times is the last resident cell and the current service cell;
if yes, adding 1 to the continuous reselection times;
if not, clearing the continuous reselection times, and recording the continuous reselection times of the last resident cell and the current service cell as 1 again.
3. The method of claim 1, further comprising:
and if the continuous reselection times are larger than a preset threshold value, determining that a ping-pong reselection event occurs between the current serving cell and the last resident cell.
4. The method of claim 1, wherein the step of setting the cell reselection priorities of the current serving cell and the last camped cell to be consistent comprises:
setting the cell reselection priority of the current serving cell as the cell reselection priority of the last resident cell; or, setting the cell reselection priority of the last resident cell as the cell reselection priority of the current serving cell.
5. The method according to claim 1, wherein before the step of recording cell reselection information corresponding to the current serving cell when the mobile terminal reselects to the current serving cell, the method further comprises:
periodically acquiring cell reselection parameters and signal strengths of an initial serving cell and a plurality of adjacent cells; the cell reselection parameters include: a cell reselection priority;
performing cell reselection based on the cell reselection parameters, the signal strength and a preset cell reselection criterion; the cell reselection criteria include: a high priority cell reselection criterion, a same priority cell reselection criterion, and a low priority cell reselection criterion.
6. The method of claim 1, wherein the current serving cell and the last camped cell are both LTE cells or both 5G cells.
7. A control apparatus for cell reselection, the apparatus being applied to a mobile terminal, the apparatus comprising:
the information recording module is used for recording cell reselection information corresponding to the current serving cell when the mobile terminal reselects the current serving cell; wherein the cell reselection information comprises: the identification of the last resident cell, the identification of the current service cell, and the continuous reselection times between the last resident cell and the current service cell;
a judging module, configured to judge whether cell reselection priorities corresponding to the current serving cell and the last camped cell are consistent if the number of consecutive reselections is greater than a preset threshold;
a priority setting module, configured to set, if the current serving cell and the cell reselection priority of the last resident cell are not consistent, the cell reselection priority of the current serving cell and the cell reselection priority of the last resident cell to be consistent, so that the mobile terminal performs cell reselection based on a preset same priority reselection criterion, where the preset same priority reselection criterion includes: if the duration of the rankine value of the last resident cell is larger than the rankine value of the current serving cell reaches a reselection time threshold, reselecting the last resident cell from the current serving cell; if the duration time does not reach the reselection time threshold, residing in the current serving cell;
wherein the Ranking value Rs of the current serving cell is Qmeas, s + Qhyst;
the Ranking value Rn of the last resident cell is Qmeas, n + Qoffset;
qmeas, s and Qmeas, n are the signal strengths of the current serving cell and the last resident cell, respectively; qhyst is a cell reselection hysteresis value; qoffset is the cell offset.
8. The apparatus of claim 7, wherein the information recording module is further configured to:
recording the identifier of the last resident cell and the identifier of the current service cell;
detecting whether the cell corresponding to the last recorded continuous reselection times is the last resident cell and the current service cell;
if yes, adding 1 to the continuous reselection times;
if not, clearing the continuous reselection times, and recording the continuous reselection times of the last resident cell and the current service cell as 1 again.
9. The apparatus of claim 7, further comprising:
and the ping-pong reselection determining module is used for determining that a ping-pong reselection event occurs between the current serving cell and the last resident cell if the continuous reselection frequency is greater than a preset threshold value.
10. The apparatus of claim 7, wherein the priority setting module is further configured to:
setting the cell reselection priority of the current serving cell as the cell reselection priority of the last resident cell; or, setting the cell reselection priority of the last resident cell as the cell reselection priority of the current serving cell.
11. The apparatus of claim 7, further comprising:
the information acquisition module is used for periodically acquiring cell reselection parameters and signal strengths of an initial serving cell and a plurality of adjacent cells; the cell reselection parameters include: a cell reselection priority;
the cell reselection module is used for reselecting the cell based on the cell reselection parameters, the signal strength and a preset cell reselection criterion; the cell reselection criteria include: a high priority cell reselection criterion, a same priority cell reselection criterion, and a low priority cell reselection criterion.
12. A mobile terminal is characterized in that the mobile terminal comprises a mobile terminal body; the mobile terminal body is provided with a control device for cell reselection according to any one of claims 7-11.
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| CN113141641B (en) * | 2020-01-19 | 2023-01-03 | 中国移动通信有限公司研究院 | Method and equipment for reselecting cell |
| CN111510974B (en) * | 2020-04-21 | 2022-05-31 | 维沃移动通信有限公司 | Cell reselection method and electronic equipment |
| WO2022056718A1 (en) * | 2020-09-16 | 2022-03-24 | Qualcomm Incorporated | Priority-based radio access technology reselection handling |
| CN114731562B (en) * | 2022-02-21 | 2024-02-23 | 北京小米移动软件有限公司 | Cell reselection priority determining method and device, terminal and storage medium |
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