CN101808350A - Common-frequency cell determining method and device - Google Patents
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Abstract
The invention discloses a common-frequency cell determining method and a common-frequency cell determining device. The method comprises the following steps that: a terminal is interfered by common-frequency signals, and the terminal acquires a reference common-frequency cell set of resident cells; the terminal selects any one or more cells from the reference common-frequency cell set to update the common-frequency cell set of the resident cells stored in the terminal and determine the updated common-frequency cell set; the terminal judges whether the terminal meets the demodulation performance requirement or not according to the updated common-frequency cell set; and the terminal determines the updated common-frequency cell set as the common-frequency cells of the resident cells if the terminal meets the demodulation performance requirement. The method and the device can precisely detect the common-frequency cells of the resident cells, effectively improve the demodulation performance of a joint detection algorithm and effectively avoid common-frequency interference.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of common-frequency cell determining method and device.
Background technology
Insert (Time Division-Synchronous Code DivisionMultiple Access in TD SDMA, abbreviate TD-SCDMA as) in the system, the main N frequency point co-frequency network's mode that adopts communicates, utilize this networking mode, Wideband Code Division Multiple Access (WCDMA) in 3G (Third Generation) Moblie inserts (Wide Code Division Multiple Access, abbreviate WCDMA as) system and CDMA2000 (Code Division Multiple Access2000), the TD-SCDMA system can obtain the higher availability of frequency spectrum.
But the identical networking mode of TD-SCDMA can be brought problem of co-channel interference, though can avoid co-channel interference on the TS#0 time slot preferably based on the identical networking mode of N frequency, for business time-slot, still has problem of co-channel interference.
In order to eliminate the problem of co-channel interference of business time-slot, main at present employing joint detection algorithm overcomes this problem, joint detection algorithm is prior informations such as cell id of passing through the co-frequency cell that obtained, comes this user's data of demodulation in conjunction with this community user information.But for business time-slot, at present mainly be by measuring received signal code power (the Received Signal Code Power of TS#0, abbreviate RSCP as) obtain the cell information of co-frequency cell, yet, along with the increase of network load and the influence of descending power control, go up the very little co-frequency cell of RSCP measured value for TS#0, on business time-slot, may have very strong interfering signal power, omission for these strong jamming sub-districts, the joint detection algorithm demodulation performance can be greatly worsened, thereby the co-frequency cell of this sub-district can't be accurately detected.
At detecting the problem of makeing mistakes owing to omission strong jamming sub-district causes co-frequency cell in the correlation technique, effective solution is not proposed as yet at present.
Summary of the invention
At in the correlation technique for the omission of these strong jamming sub-districts, can greatly worsen the joint detection algorithm demodulation performance, thereby can't accurately detect the problem of the co-frequency cell of this sub-district, the present invention proposes a kind of common-frequency cell determining method, can effectively avoid the omission of co-frequency cell, thereby definite exactly co-frequency cell is avoided co-channel interference.
At in the correlation technique for the omission of these strong jamming sub-districts, can greatly worsen the joint detection algorithm demodulation performance, thereby can't accurately detect the problem of the co-frequency cell of this sub-district, the present invention proposes a kind of definite device of co-frequency cell, can effectively avoid the omission of co-frequency cell, thereby definite exactly co-frequency cell is avoided co-channel interference.
Technical scheme of the present invention is achieved in that
A kind of common-frequency cell determining method comprises:
Terminal is subjected to homogenous frequency signal and disturbs, and terminal is obtained its reference common-frequency cell set of resident cells;
Terminal is selected any one or a plurality of sub-district from reference co-frequency cell set, the co-frequency cell set after determining to upgrade is upgraded in the co-frequency cell set of the persistent district that terminal is preserved;
Terminal judges according to the co-frequency cell set after upgrading whether terminal satisfies demodulation performance, if terminal satisfies demodulation performance, the co-frequency cell set after terminal will be upgraded is defined as the co-frequency cell of persistent district.
Wherein, terminal is subjected to the processing that homogenous frequency signal disturbs and comprises:
The signal strength signal intensity that terminal receives is more than or equal to signal strength threshold, and terminal is determined noise power changing value between any two adjacent sliding windows of terminal more than or equal to the noise power change threshold according to channel estimation results.
Wherein, terminal is subjected to the processing that homogenous frequency signal disturbs and comprises:
The signal strength signal intensity that terminal receives is more than or equal to signal strength threshold, and the signal to noise ratio that terminal detects demodulating data is less than or equal to snr threshold.
Preferably, the reference common-frequency cell set of resident cells obtained of terminal periodically is notified to terminal by the base station.
Wherein, terminal is selected any one or a plurality of sub-district from reference co-frequency cell set, and the processing that the co-frequency cell set of the persistent district that terminal is preserved is upgraded comprises:
If the sub-district number in the co-frequency cell set is less than the disposal ability number of terminal, difference number N between then computing ability number and sub-district number, and in the set of reference co-frequency cell, select N sub-district arbitrarily, N the sub-district of selecting joined in the co-frequency cell set; Perhaps,
If the sub-district number in the co-frequency cell set equals the disposal ability number of terminal, then calculate the received signal code power of each sub-district in the co-frequency cell set, sub-district deletion from the co-frequency cell set with the value minimum of received signal code power, and in the set of reference co-frequency cell, select a sub-district arbitrarily, this sub-district is joined in the co-frequency cell set.
Wherein, the terminal processing of satisfying demodulation performance comprises:
Terminal detects the signal to noise ratio of demodulating data of terminal greater than snr threshold.
Preferably, the signal to noise ratio of the demodulating data of terminal is meant greater than snr threshold: the mean value of the signal to noise ratio of the demodulating data of a plurality of subframes of terminal is greater than snr threshold.
Further, said method also comprises:
The power difference of the maximal window of each sub-district in user's window that terminal is determined persistent district respectively and the co-frequency cell of the persistent district of determining, and the power difference of user's window of maximal window and persistent district deleted from the co-frequency cell of definite persistent district greater than the sub-district of predetermined value.
A kind of definite device of co-frequency cell comprises:
Detection module is used to detect terminal and is subjected to the homogenous frequency signal interference;
Acquisition module is used to obtain reference common-frequency cell set of resident cells;
Preserve module, the co-frequency cell set of the persistent district that is used to preserve;
Update module is used for selecting any one or a plurality of sub-district from the set of the reference co-frequency cell of acquisition module, the co-frequency cell set after determining to upgrade is upgraded in the co-frequency cell set of preserving the persistent district that module preserves;
Judge module is used for judging according to the co-frequency cell set after upgrading whether terminal satisfies demodulation performance;
Determination module satisfies demodulation performance if judge module is judged terminal, is used for the co-frequency cell set after upgrading is defined as the co-frequency cell of persistent district.
Wherein, detect signal strength signal intensity that terminal receives more than or equal to signal strength threshold at detection module, and detect under the situation of noise power changing value more than or equal to the noise power change threshold between any two adjacent sliding windows of terminal, detection module detects persistent district and is subjected to homogenous frequency signal and disturbs.
Wherein, detect signal strength signal intensity that terminal receives more than or equal to signal strength threshold at detection module, and the signal to noise ratio that detects the demodulating data of terminal is less than or equal under the situation of snr threshold, and detection module detects persistent district and is subjected to the homogenous frequency signal interference.
By technique scheme of the present invention, gather by obtaining with reference to co-frequency cell by terminal, and with the local co-frequency cell set of preserving of the cell update terminal in this set, can accurately detect the co-frequency cell of persistent district, thereby effectively improve the joint detection algorithm demodulation performance, effectively avoid co-channel interference.
Description of drawings
Fig. 1 is the flow chart according to the method for the embodiment of the invention;
Fig. 2 is the realization schematic diagram according to the embodiment of the invention;
Fig. 3 is the detection schematic diagram according to the embodiment of the invention;
Fig. 4 is the composition structure chart according to definite device of the co-frequency cell of the embodiment of the invention.
Embodiment
At the influence of controlling along with the increase and the descending power of network load in the prior art, go up the very little co-frequency cell of RSCP measured value for TS#0, on business time-slot, may have very strong interfering signal power, omission for these strong jamming sub-districts, can greatly worsen the joint detection algorithm demodulation performance, cause accurately to obtain the problem of the co-frequency cell of persistent district by joint detection algorithm, the invention provides a kind of common-frequency cell determining method, terminal is gathered by obtaining with reference to co-frequency cell, and with the local co-frequency cell set of preserving of the cell update terminal in this set, can accurately detect the co-frequency cell of persistent district, thereby effectively improve the joint detection algorithm demodulation performance, avoid co-channel interference.
Fig. 1 is the flow chart according to the common-frequency cell determining method of the embodiment of the invention, as shown in Figure 1, may further comprise the steps:
Step S101, terminal detects it and is subjected to the homogenous frequency signal interference, at this moment, illustrates that terminal is subjected to the signal interference of the co-frequency cell of its persistent district, need the co-frequency cell set of the persistent district of more new terminal preservation, terminal can be obtained reference common-frequency cell set of resident cells.
Step S102, terminal is selected any one or a plurality of sub-district from reference co-frequency cell set, and the co-frequency cell set after determining to upgrade is upgraded in the co-frequency cell set of the persistent district that terminal is preserved.
Step S103, terminal judges according to the co-frequency cell set after upgrading whether terminal satisfies demodulation performance, if terminal satisfies demodulation performance, the co-frequency cell set after terminal will be upgraded is defined as the co-frequency cell of persistent district.
By means of above-mentioned processing, gather by obtaining by terminal, and gather, can accurately detect the co-frequency cell of persistent district with the local co-frequency cell of preserving of the cell update terminal in this set with reference to co-frequency cell, thereby effectively improve the joint detection algorithm demodulation performance, effectively avoid co-channel interference.
Below above steps is elaborated.
In step S101, terminal can detect it by following dual mode and be subjected to the processing that homogenous frequency signal disturbs:
Mode 1: the signal strength signal intensity that terminal receives is more than or equal to signal strength threshold, and terminal is determined noise power changing value between any two adjacent sliding windows of terminal more than or equal to the noise power change threshold according to channel estimation results.
Mode 2: the signal strength signal intensity that terminal receives is more than or equal to signal strength threshold, and the signal to noise ratio that terminal detects demodulating data is less than or equal to snr threshold.
In step S101, the base station can periodically send reference common-frequency cell set of resident cells to terminal, terminal receives this with reference to after the co-frequency cell set, can be kept at this locality, and be updated periodically this and gather with reference to co-frequency cell, in a single day terminal detects and is subjected to homogenous frequency signal and disturbs, will be from this locality or the base station obtain the reference common-frequency cell set of resident cells of this terminal, upgrade processing with co-frequency cell tabulation (being co-frequency cell set mentioned above) to this persistent district.
In step S102, according to the sub-district number in the co-frequency cell set and the disposal ability number of terminal, the processing that terminal is upgraded the co-frequency cell set of the persistent district of terminal preservation comprises following dual mode:
Mode 1: if the sub-district number in the co-frequency cell set is less than the disposal ability number of terminal, difference number N between then computing ability number and sub-district number, and in the set of reference co-frequency cell, select N sub-district arbitrarily, a selected N sub-district is joined in the co-frequency cell set.
Mode 2: if the sub-district number in the co-frequency cell set equals the disposal ability number of terminal, then calculate the received signal code power of each sub-district in the co-frequency cell set, sub-district deletion from the co-frequency cell set with the value minimum of received signal code power, and in the set of reference co-frequency cell, select a sub-district arbitrarily, this sub-district is joined in the co-frequency cell set.
In step S103, terminal can judge whether terminal satisfies demodulation performance according to the set of the co-frequency cell after upgrading, if terminal detects the signal to noise ratio of demodulating data greater than above-mentioned snr threshold, terminal can be defined as the set of the co-frequency cell after upgrading the co-frequency cell of persistent district.More accurate for the data that make detection, terminal can detect the signal to noise ratio of the demodulating data of each subframe, and calculates the mean value of signal to noise ratio of the demodulating data of many subframes, and mean value and snr threshold are compared.For example, number of sub frames is desirable 4, if the SNR mean value of 4 subframes of persistent district is greater than SNR threshold value (for example, the SNR threshold value is 7dB), then terminal can be defined as the set of the co-frequency cell after upgrading the co-frequency cell of persistent district.On the contrary, be less than or equal to above-mentioned snr threshold if terminal detects the signal to noise ratio of demodulating data, will change step S101 over to, re-execute step S101 to step S103, the signal to noise ratio that detects demodulating data until terminal is greater than above-mentioned snr threshold.
Be elaborated below in conjunction with accompanying drawing 2 and 3 pairs of embodiment of the invention of accompanying drawing, Fig. 2 is the realization schematic diagram according to the embodiment of the invention, and Fig. 3 is the detection schematic diagram according to the embodiment of the invention.
Because unknown strongly disturbing appearance can have a strong impact on the result and the demodulation performance of channel estimating, the present invention at first judges whether the unknown high reject signal of burst according to the signal to noise ratio snr of demodulating data with according to the noise power that the initial channel estimation result of this sub-district calculates, and judgment criterion is to use the demodulation signal to noise ratio result of multiframe noise power-value and present frame.Particularly, strongly disturbingly occur meaning that received signal intensity need satisfy certain intensity, at first, when RSSI (indication of received signal intensity) satisfies thresholding, i.e. RSSI＞T
RSSIThe time carry out the judgement of subsequent step again, wherein, T
RSSICan be according to actual condition of external field adjustment, for example, T
RSSIValue can be-100dBm; Then, judge again whether noise power and demodulation signal to noise ratio satisfy any one in following two conditions: SNR＜T
SNROr NP
C＞NP
F+ T
NPIf, satisfy condition, then judge and unknown have (be terminal detect its persistent district be subjected to homogenous frequency signal and disturb), and enable the blind Detecting device with strong jamming frequently, wherein, ()
FRepresent preceding 8 frame average results, ()
CRepresent current 8 frame average results, SNR and NP represent 8 frame average results of demodulation signal to noise ratio and noise power respectively, for example,
Value is 4dB, T
NPValue is 6dB.
When terminal detects unknownly when existing with strong jamming frequently, as shown in Figure 2, start the cell id that the blind Detecting device detects unknown strong jamming sub-district.For paring down expenses, need divide by certain criterion the sub-district ID scope that blind estimator is estimated, physical planning situation according to network, terminal the same frequency strong jamming sub-district of resident sub-district appear at the probability of the sub-district of measuring much larger than the sub-district of not doing to measure, so actually can do blind Detecting to the set of cells of having measured earlier when doing blind Detecting, after all these cell detection are intact, still do not satisfy blind Detecting terminator condition, then continue the sub-district of not measuring.
After cell detection was determined in proper order, ensuing was the renewal of co-frequency cell memory, specifically comprises initial phase and poll detection-phase.Initial phase: do joint-detection according to corresponding sub-district from little region memorizer to be detected, sub-district that the RSCP value of last each sub-district of TS#0 is chosen, concrete selection algorithm is: count X as if the sub-district of choosing according to TS#0, and receiver actual treatment ability is N, then the sub-district number of choosing from little region memorizer to be detected is N-X, when X=N, replace the sub-district of initialization with RSCP minimum in the tabulation frequently with a sub-district in the set of cells to be detected, as if being example with the TD-SCDMA terminal, N general desirable 4; Poll detection-phase:, from little region memorizer to be detected, select the cell update of same number current with tabulation frequently according to the sub-district number of deleting in the testing process last time.
Finish when co-frequency cell upgrades, then enable the blind Detecting device and detect unknown strong jamming frequently together sub-district, concrete steps are: as shown in Figure 3, do channel estimating according to the co-frequency cell of this renewal, the channel estimating reprocessing; Maximum channel estimating window power according to the channel estimating reprocessing sorts to each sub-district, and calculates the signal power of the maximal window of this user window and other each co-frequency cells, if difference greater than thresholding Tp, is then deleted this sub-district ID; If the difference power of all sub-districts is then deleted last sub-district ID all less than thresholding Tp, the desirable 9dB of Tp during realization detects according to this result next time and upgrades with the frequency list memory.
After this interfered cell detects and finishes, next step is to judge whether to withdraw from detection algorithm, detailed process is: if the SNR value of present frame is greater than the SNR thresholding, some subframes under then connecing use current the tabulation with frequency to do joint-detection, during realization, and desirable 4 of number of sub frames, if the SNR mean value of 4 subframes is greater than SNR thresholding (reference value of SNR thresholding is 7dB), then withdraw from the blind Detecting device, past co-frequency cell memory and little region memorizer to be detected return and withdraw from indication, and two memories quit work; Otherwise continuing next time detects.
By means of above-mentioned processing, gather by obtaining with reference to co-frequency cell by terminal, to each independently business time-slot carry out co-frequency cell and detect, and with this with reference to the local co-frequency cell set of preserving of the cell update terminal in the co-frequency cell set, can accurately detect the co-frequency cell of persistent district, thereby effectively improve the joint detection algorithm demodulation performance, effectively avoid co-channel interference, can improve recipient's demodulation performance largely increasing under the prerequisite seldom measure expense.
Fig. 4 is the composition structure chart according to definite device of the co-frequency cell of the embodiment of the invention, and this device can be arranged in the terminal, and as shown in Figure 4, this device comprises:
Detection module 1 is used to detect terminal and is subjected to the homogenous frequency signal interference;
Acquisition module 2 is used to obtain reference common-frequency cell set of resident cells;
Preserve module 3, the co-frequency cell set of the persistent district that is used to preserve;
Update module 4 is used for selecting any one or a plurality of sub-district from the set of the reference co-frequency cell of acquisition module, the co-frequency cell set after determining to upgrade is upgraded in the co-frequency cell set of preserving the persistent district that module preserves;
Judge module 5 is used for judging according to the co-frequency cell set after upgrading whether terminal satisfies demodulation performance;
Determination module 6 satisfies demodulation performance if judge module is judged terminal, is used for the co-frequency cell set after upgrading is defined as the co-frequency cell of persistent district.
Acquisition module 2 can be used for periodically obtaining with reference to co-frequency cell from the base station and gather.
By means of above-mentioned terminal, gather by obtaining, and gather, thereby can effectively improve the joint detection algorithm demodulation performance with the local co-frequency cell of preserving of the cell update terminal in this set with reference to co-frequency cell, accurately detect the co-frequency cell of persistent district, effectively avoid co-channel interference.
In sum, by means of technique scheme of the present invention, gather by obtaining with reference to co-frequency cell by terminal, to each independently business time-slot carry out co-frequency cell and detect, and with this with reference to the local co-frequency cell set of preserving of the cell update terminal in the co-frequency cell set, can accurately detect the co-frequency cell of persistent district, thereby effectively improve the joint detection algorithm demodulation performance, effectively avoid co-channel interference, can improve recipient's demodulation performance largely increasing under the prerequisite seldom measure expense.
Fig. 4 is the terminal corresponding with previous methods, and the course of work of terminal and operation principle are described in detail in the method part, do not repeat them here, and the description of appropriate section gets final product in the reference method.That is, according to each processing described in can implementation method embodiment of the terminal of present embodiment, concrete processing procedure no longer repeats here.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a common-frequency cell determining method is characterized in that, comprising:
Terminal is subjected to homogenous frequency signal and disturbs, and described terminal is obtained its reference common-frequency cell set of resident cells;
With reference to selecting any one or a plurality of sub-district the co-frequency cell set, the co-frequency cell set after determining to upgrade is upgraded in the co-frequency cell set of the described persistent district that described terminal is preserved to described terminal from described;
Described terminal judges according to the described co-frequency cell set after upgrading whether described terminal satisfies demodulation performance, if described terminal satisfies described demodulation performance, the described co-frequency cell set after described terminal will be upgraded is defined as the co-frequency cell of described persistent district.
2. definite method according to claim 1 is characterized in that, the processing that described terminal is subjected to the homogenous frequency signal interference comprises:
The signal strength signal intensity that described terminal receives is more than or equal to signal strength threshold, and described terminal is determined noise power changing value between any two adjacent sliding windows of described terminal more than or equal to the noise power change threshold according to channel estimation results.
3. definite method according to claim 1 is characterized in that, the processing that described terminal is subjected to the homogenous frequency signal interference comprises:
The signal strength signal intensity that described terminal receives is more than or equal to signal strength threshold, and the signal to noise ratio that described terminal detects demodulating data is less than or equal to snr threshold.
4. definite method according to claim 1 is characterized in that, the described reference common-frequency cell set of resident cells that described terminal is obtained periodically is notified to described terminal by the base station.
5. according to each described definite method in the claim 1 to 4, it is characterized in that, with reference to selecting any one or a plurality of sub-district the co-frequency cell set, the processing that the co-frequency cell set of the described persistent district that described terminal is preserved is upgraded comprises described terminal from described:
If the sub-district number in the described co-frequency cell set is less than the disposal ability number of described terminal, then calculate the difference number N between described disposal ability number and described sub-district number, and described with reference to selecting N sub-district in the co-frequency cell set arbitrarily, described N the sub-district of selecting joined during described co-frequency cell gathers; Perhaps,
If the sub-district number in the described co-frequency cell set equals the disposal ability number of described terminal, then calculate the received signal code power of each sub-district in the described co-frequency cell set, sub-district deletion from described co-frequency cell set with the value minimum of received signal code power, and described with reference to selecting a sub-district in the co-frequency cell set arbitrarily, this sub-district is joined in the described co-frequency cell set.
6. according to each described definite method in the claim 1 to 4, it is characterized in that the processing that described terminal satisfies described demodulation performance comprises:
Described terminal detects the signal to noise ratio of demodulating data of described terminal greater than described snr threshold.
7. definite method according to claim 6 is characterized in that, the signal to noise ratio of the demodulating data of described terminal is meant greater than described snr threshold: the mean value of the signal to noise ratio of the demodulating data of a plurality of subframes of described terminal is greater than described snr threshold.
8. according to each described definite method in the claim 1 to 4, it is characterized in that, also comprise:
The power difference of the maximal window of each sub-district in user's window that described terminal is determined described persistent district respectively and the co-frequency cell of the described persistent district of determining, and the power difference of user's window of maximal window and described persistent district deleted from the co-frequency cell of definite described persistent district greater than the sub-district of predetermined value.
9. definite device of a co-frequency cell is characterized in that, comprising:
Detection module is used to detect terminal and is subjected to the homogenous frequency signal interference;
Acquisition module is used to obtain described reference common-frequency cell set of resident cells;
Preserve module, the co-frequency cell set of the described persistent district that is used to preserve;
Update module is used for described with reference to selecting any one or a plurality of sub-district the co-frequency cell set from described acquisition module, and the co-frequency cell set after determining to upgrade is upgraded in the co-frequency cell set of the described persistent district that described preservation module is preserved;
Judge module is used for judging according to the described co-frequency cell set after upgrading whether described terminal satisfies demodulation performance;
Determination module satisfies described demodulation performance if described judge module is judged described terminal, is used for the described co-frequency cell set after upgrading is defined as the co-frequency cell of described persistent district.
10. definite device according to claim 9, it is characterized in that, detect signal strength signal intensity that described terminal receives more than or equal to signal strength threshold at described detection module, and detect under the situation of noise power changing value more than or equal to the noise power change threshold between any two adjacent sliding windows of described terminal, described detection module detects described persistent district and is subjected to homogenous frequency signal and disturbs.
11. definite device according to claim 9, it is characterized in that, detect signal strength signal intensity that described terminal receives more than or equal to signal strength threshold at described detection module, and the signal to noise ratio that detects the demodulating data of described terminal is less than or equal under the situation of snr threshold, and described detection module detects described persistent district and is subjected to the homogenous frequency signal interference.
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| WO2014082597A1 (en) * | 2012-11-29 | 2014-06-05 | 华为技术有限公司 | Same-frequency signal interference measurement method and receiver |
| CN105792222A (en) * | 2014-12-23 | 2016-07-20 | 中兴通讯股份有限公司 | Co-frequency interference cancellation method and device, co-frequency interference detection method and device, and base station |
| CN105792222B (en) * | 2014-12-23 | 2020-02-11 | 中兴通讯股份有限公司 | Method for eliminating co-channel interference, detection method and device and base station |
| CN105828360A (en) * | 2015-01-06 | 2016-08-03 | 中国移动通信集团上海有限公司 | Communication cluster determination method and communication cluster determination device |
| CN105828360B (en) * | 2015-01-06 | 2019-05-14 | 中国移动通信集团上海有限公司 | A kind of connection cluster determines method and apparatus |
| CN114978211A (en) * | 2022-05-12 | 2022-08-30 | 维沃移动通信有限公司 | Electronic device protection method and electronic equipment |
| CN114978211B (en) * | 2022-05-12 | 2024-06-07 | 维沃移动通信有限公司 | Electronic device protection method and electronic equipment |
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