CN103685095A - Method and device for achieving adjacent-channel interference suppression - Google Patents
Method and device for achieving adjacent-channel interference suppression Download PDFInfo
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Abstract
The invention discloses a method and device for achieving adjacent-channel interference suppression. The method includes the steps of detecting the intensity of adjacent-channel interference signals in received signals, carrying out parameter configuration on a filter according to the detected intensity of the adjacent-channel interference signals, and carrying out filtering processing on the received signals through the filter after parameter configuration to filter out the adjacent-channel interference signals in the received signals. By means of the method and device, attenuation of the filter to the useful signals can be reduced, meanwhile, the suppression on the adjacent-channel interference signals is achieved as far as possible, and the receiving effect of a receiver in the strong-interference environment is improved.
Description
Technical field
The present invention relates to wireless communication technology field, be specifically related to a kind of method and apparatus that monkey chatter suppresses of realizing.
Background technology
In various radio communications and broadcast growing today, the mutual interference problem of various wireless systems is more and more outstanding.Typical situation is that adjacent channel exists than the strong a lot of interference signal of working channel.For CMMB(China Mobile Multimedia Broadcasting, China Mobile multimedia broadcasting) system, a kind of typical case is that the adjacent frequency of CMMB exists very strong anolog TV signals; Because traditional anolog TV signals are single tower transmittings, and CMMB signal adopts the mode of single frequency network more, so anolog TV signals generally will transmit much larger than CMMB; Therefore,, closing near simulated television launching tower, conventionally exist anolog TV signals to be far better than the situation of the digital television signals such as CMMB.
For the broadband wireless broadcast communication system of this class digital multi-carrier system of CMMB, simulation monkey chatter is better than useful signal itself conventionally far away, and conventional method adopts this class of solid shape filter filtering to disturb more.Yet due to the impact of wireless channel environment, the relative intensity of monkey chatter signal also can change; Meanwhile, because filter can exist certain transition band, if transition band drops in interference channel, obviously inadequate to the inhibition of interference signal, in the strong especially place of interference signal, the situation that can exist interference signal not to be effectively suppressed; Meanwhile, if transition band drops in useful signal frequency band, can cause again useful signal loss.Generally adopt traditionally solid shape filter, can not adjust flexibly according to the concrete condition of monkey chatter, in the situation that not disturbing or interference is very little, can cause design waste, some did not need the sideband signals that is subject to the impact of filter transition band to be subject to impact originally; And there is the phenomenon that suppresses scarce capacity very strong in the situation that disturbing.
Summary of the invention
In view of the above problems, the present invention proposes a kind of a kind of method and corresponding a kind of device that monkey chatter suppresses of realizing of realizing monkey chatter inhibition that overcomes the problems referred to above or address the above problem at least in part.
According to one aspect of the present invention, a kind of method that monkey chatter suppresses that realizes is provided, comprising: detect the monkey chatter signal strength signal intensity in the signal receiving; According to the described monkey chatter signal strength signal intensity detecting, filter is carried out to parameter configuration; Utilize the filter after described parameter configuration to carry out filtering processing to the described signal receiving, the monkey chatter signal in the signal receiving described in filtering.
Preferably, the monkey chatter signal strength signal intensity in the signal that described detection receives comprises: the different bandwidth that system baseband filter is set; The signal power receiving described in detecting respectively in described different bandwidth position; Calculating high bandwidth position is poor with the corresponding signal power receiving in low bandwidth position, usings this difference as the monkey chatter signal strength signal intensity in the described signal receiving.
Preferably, described filter is analog baseband filter or digital baseband filter.
Preferably, the described monkey chatter signal strength signal intensity that described basis detects is carried out parameter configuration to filter and is comprised: the stopband attenuation that obtains described filter; When described monkey chatter signal strength signal intensity changes, described filter stop bend decay is set to and described monkey chatter signal strength signal intensity corresponding relation in direct ratio.
Preferably, described filter stop bend decay is set to comprise with described interference signal intensity corresponding relation in direct ratio: when described monkey chatter signal strength signal intensity strengthens, increase described filter stop bend decay, described filter transition band is passed in band; When described monkey chatter signal strength weakening, reduce described filter stop bend decay, described filter transition band is passed outside band.
According to another aspect of the present invention, a kind of device that monkey chatter suppresses of realizing is provided, comprising: detecting unit, for detection of the monkey chatter signal strength signal intensity of the signal receiving; Dispensing unit, carries out parameter configuration for the monkey chatter signal strength signal intensity detecting according to described detecting unit to filter; And, filtering unit, for utilizing the filter of described dispensing unit configuration to carry out filtering processing to the described signal receiving, the monkey chatter signal in the signal receiving described in filtering.
Preferably, described detecting unit comprises: module is set, for the different bandwidth of system baseband filter is set; Go-on-go module, for the signal power receiving described in detecting respectively under the described different bandwidth position that module setting is set; And computing module, for calculating the poor of high bandwidth position and the corresponding signal power receiving in low bandwidth position, usings the monkey chatter signal strength signal intensity of this difference as the described signal receiving.
Preferably, described dispensing unit, specifically for carrying out parameter configuration to analog baseband filter or digital baseband filter.
Preferably, described dispensing unit comprises: acquisition module, for obtaining the stopband attenuation of described filter; Processing module, for when described monkey chatter signal strength signal intensity changes, described filter stop bend decay is set to be arranged to direct proportion corresponding relation with described monkey chatter signal strength signal intensity.
Preferably, described processing module comprises: the first change submodule, for when described monkey chatter signal strength signal intensity strengthens, increase described filter stop bend decay, and described filter transition band is passed in band; And/or the second change submodule, for when the described monkey chatter signal strength weakening, reduces described filter stop bend decay, by the passing outside band of described filter transition band.
Adopt method and apparatus of the present invention, by the real-time detection to interference, and according to testing result, filter is carried out to parameter configuration, filter filtering monkey chatter signal after recycling configuration parameter, thereby reduced to greatest extent the decay of filter to useful signal itself, also realized as much as possible the inhibition to monkey chatter signal, improved the reception of receiver under strong interference environment simultaneously.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of specification, and for above and other objects of the present invention, feature and advantage can be become apparent, below especially exemplified by the specific embodiment of the present invention.
Accompanying drawing explanation
By reading below detailed description of the preferred embodiment, various other advantage and benefits will become cheer and bright for those of ordinary skills.Accompanying drawing is only for the object of preferred implementation is shown, and do not think limitation of the present invention.And in whole accompanying drawing, by identical reference symbol, represent identical parts.In the accompanying drawings:
Fig. 1 shows a kind of method flow schematic diagram of realizing monkey chatter inhibition of the embodiment of the present invention;
Fig. 2 shows a kind of method flow schematic diagram of realizing monkey chatter inhibition of another embodiment of the present invention;
Fig. 3 shows a kind of apparatus structure schematic block diagram of realizing monkey chatter inhibition of the embodiment of the present invention.
Embodiment
As everyone knows, for traditional filter, if need to strengthen the ability that suppresses monkey chatter, just need to increase the exponent number of filter, and the more precipitous filter of design transition band.But the broadcast communication technology that the OFDM of take is core technology is owing to having adopted multi-transceiver technology and inside and outside interweaving and error-correcting decoding, even if there is in the course of the work the filtered device filtering of parton carrier wave, correct restituted signal still.As for CMMB, even if subcarrier has 20% loss, still may correct demodulation.The present invention is just based on this feature, for the broadcast of OFDM broadband and mobile communication, proposed at strong ACI(Adjacent Channel Interference, the method that adopts variable filter bandwidth while adjacent frequency interference) working under environment, strengthens the ability that ACI disturbs that suppresses; And, because digital filter bandwidth easily changes, also greatly reduce system cost.
Exemplary embodiment of the present disclosure is described below with reference to accompanying drawings in more detail.Although shown exemplary embodiment of the present disclosure in accompanying drawing, yet should be appreciated that and can realize the disclosure and the embodiment that should do not set forth limits here with various forms.On the contrary, it is in order more thoroughly to understand the disclosure that these embodiment are provided, and can by the scope of the present disclosure complete convey to those skilled in the art.
With reference to Fig. 1, show a kind of according to an embodiment of the invention flow chart of steps that realizes the embodiment of the method 1 of monkey chatter inhibition, specifically can comprise the steps:
Step 110: detect the monkey chatter signal strength signal intensity in the signal receiving;
It should be noted that, well-known for the broadband wireless broadcast communication system of the digital multi-carrier systems such as CMMB, the useful restituted signal that receiver receives is fixing and is all known for transmit leg and recipient, in the present embodiment referred to as " standard signal ", below roughly the same repeat no more; In the embodiment of the present invention, the signal receiving comprises: standard signal and monkey chatter signal.Certainly, the signal that also may receive only has standard signal, and now monkey chatter signal strength signal intensity is zero.Therefore the monkey chatter signal in, needing to the received signal suppresses.
Concrete, those of ordinary skills readily understand and can adopt various ways of the prior art to detect monkey chatter signal strength signal intensity, thereby suppress.And the present embodiment proposes to realize in the following ways, but be not limited to this:
S111: the different bandwidth that system baseband filter is set;
S112: detect respectively the signal power receiving in above-mentioned different bandwidth position; Wherein, in some specific bandwidth position, the power of standard signal may be detected, and the power of standard signal and monkey chatter signal in other bandwidth positions, may be detected.
S113: calculating high bandwidth position is poor with the corresponding signal power receiving in low bandwidth position, usings this difference as the monkey chatter signal strength signal intensity in the signal receiving; Concrete, if there is no monkey chatter signal, the signal power receiving in different bandwidth position should be all always, be all standard signal power, and if once the signal power receiving in high bandwidth position is greater than the signal power that low bandwidth position receives, wherein must comprise monkey chatter signal; Therefore the monkey chatter signal strength signal intensity in the signal that, the present embodiment proposes the difference of the two power to be defined as receiving.
Certainly, those of ordinary skills readily understand and also can be set in system works centre frequency to direct-detection interference signal intensity in the centre frequency of ACI passage, and the present embodiment repeats no more.
Step 120: filter is carried out to parameter configuration according to the monkey chatter signal strength signal intensity detecting;
In actual application, the filter that parameter configuration is carried out in the present embodiment proposition can be both analog baseband filter, can be also digital baseband filter; Consider the flexibility of digital filter, the present embodiment proposes to adopt digital baseband filter; And digital baseband filter in the present embodiment can be one group of pre-designed filter, also can by system-computed, be obtained according to the actual requirements, specifically repeats no more.
It should be noted that, the present embodiment utilizes CMMB etc. to take the feature of the wireless transmission system that OFDM is core, first obtain the stopband attenuation of aforesaid filters, and when monkey chatter signal strength signal intensity changes, the transition band of filter is dropped in useful signal channel, above-mentioned filter stop bend decay and above-mentioned monkey chatter signal strength signal intensity corresponding relation in direct ratio are set; Wherein, preferred mode is when neighboring trace signal strength signal intensity grow, to reduce the bandwidth of filter: for same filter, passband reduces, transition band moves thereupon to the inside, stopband attenuation increases, and the inhibition of monkey chatter is increased thereupon, although can cause like this part useful signal to be attenuated even complete filtered device filtering, but due to chnnel coding and the error correction of multi-carrier broadband signal inherence, useful signal still can correctly be recovered; And when neighboring trace signal strength signal intensity dies down, can select to reduce the stopband attenuation of filter, as adopted filter or the simpler filter of structure of lower exponent number, the transition band of filter also can be passed to neighboring trace direction, increase filter passband width, transition band moves laterally, and stopband attenuation reduces, to reduce the decay to useful signal as far as possible.
But, it should be noted that in above-mentioned various situations, the selection of filter is all to take useful signal still to have enough demodulation signal to noise ratios be foundation: take CMMB as example, at AWGN(Additive White Gaussian Noise, additive white Gaussian noise) under channel condition, QPSK(Quadrature Phase Shift Keying, Quadrature Phase Shift Keying) the demodulation signal-noise ratio threshold of modulation system is 1.7dB, as long as signal to noise ratio is greater than this value in current band, just normally demodulation, can select to meet the filter of this demodulation condition.The filter that recycling meets this type of condition carries out monkey chatter target signal filter while processing, and when monkey chatter strengthens, while causing demodulation signal to noise ratio to approach demodulation threshold, increases filter stop bend decay, and filter transition band is passed in band; Otherwise, when monkey chatter weakens, when demodulation signal to noise ratio has larger allowance, reducing filter stop bend decay, filter transition band is passed outside band.
Step 130: utilize the filter after described parameter configuration to carry out filtering processing to the above-mentioned signal receiving, the monkey chatter signal in this signal receiving of filtering.
Concrete, the present embodiment proposes to carry out to the received signal filtering processing according to above-mentioned filter set-up mode, filtering monkey chatter signal wherein, can utilize the monkey chatter signal in the signal that the direct proportion corresponding relation of the decay of above-mentioned filter stop bend and above-mentioned monkey chatter signal strength signal intensity receives this
Carry out filtering processing, do not repeat them here.
Certainly, above-mentioned special type information and judgment mode thereof, just as example, when implementing the embodiment of the present invention, can arrange other special type informations and judgment mode thereof according to actual conditions, and the embodiment of the present invention is not limited this.In addition, except above-mentioned special type information and judgment mode thereof, those skilled in the art can also adopt other special type informations and judgment mode thereof according to actual needs, and the embodiment of the present invention is not limited this yet.
Can find out, adopt the method for the above embodiment of the present invention, by the real-time detection to monkey chatter, and according to testing result, filter is carried out to parameter configuration, filter filtering monkey chatter signal after recycling configuration parameter, thereby reduced to greatest extent the decay of filter to useful signal itself, also realized as much as possible the inhibition to monkey chatter signal, improved the reception of CMMB receiver under strong interference environment simultaneously.
For embodiment of the method, for simple description, therefore it is all expressed as to a series of combination of actions, but those skilled in the art should know, the embodiment of the present invention is not subject to the restriction of described sequence of movement, because according to the embodiment of the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and related action might not be that the embodiment of the present invention is necessary.
With reference to Fig. 2, show a kind of in accordance with another embodiment of the present invention method flow schematic diagram that monkey chatter suppresses of realizing, the method comprises:
Step 210: baseband signal bandwidth is set to 3.8MHz and 5MHz respectively;
Step 220: the signal power P1 that detection bandwidth receives while being 3.8MHz, the signal power P2 that detection bandwidth receives while being 5MHz;
Step 230: calculate the difference of above-mentioned signal power P2 and P1, can define ACI interference existence if this difference P2-P1 is greater than a certain default threshold value, and determine the intensity of ACI according to the size of aforementioned P2-P1;
Step 240: repeat above-mentioned steps 220 and step 230, and when above-mentioned monkey chatter signal strength signal intensity changes, from the difference of P1, the stopband attenuation of digital filter is carried out to different settings according to above-mentioned P2; When the difference of above-mentioned P2 and P1 increases, increase filter stop bend decay, filter transition band is passed in band, and with the filter upgrading, this monkey chatter signal is carried out to filtering processing; Otherwise, when the difference of above-mentioned P2 and P1 diminishes, reduce filter stop bend decay, filter transition band is passed outside band, and with the filter upgrading, this monkey chatter signal is carried out to filtering processing.
With reference to Fig. 3, show a kind of according to an embodiment of the invention structured flowchart of realizing the device embodiment of monkey chatter inhibition, specifically can comprise as lower member: detecting unit 310, dispensing unit 320 and filtering unit 330; Wherein,
Above-mentioned detecting unit 310 is for detection of the monkey chatter signal strength signal intensity in the signal receiving; Above-mentioned dispensing unit 320 carries out parameter configuration for the monkey chatter signal strength signal intensity detecting according to above-mentioned detecting unit 310 to filter; Above-mentioned filtering unit 330 is for utilizing the filter of above-mentioned dispensing unit 320 configurations to carry out to the received signal filtering processing, the monkey chatter signal in this signal receiving of filtering.
In addition, above-mentioned detecting unit 310 also can comprise (not shown): module, go-on-go module and computing module are set; Wherein, the above-mentioned module that arranges is for arranging the different bandwidth of system baseband filter; Above-mentioned go-on-go module for detecting respectively the above-mentioned signal power receiving under the above-mentioned different bandwidth position that module setting is set; Above-mentioned computing module, for calculating the poor of high bandwidth position and the corresponding signal power receiving in low bandwidth position, when above-mentioned difference is greater than predetermined threshold value, is usingd this difference as the monkey chatter signal strength signal intensity in the signal receiving.
It should be noted that, the filter of above-mentioned dispensing unit configuration specifically can be analog baseband filter or digital baseband filter.
In addition, above-mentioned dispensing unit 320 also can comprise (not shown): acquisition module and processing module; Wherein, this acquisition module is for obtaining the stopband attenuation of filter; This processing module is for being arranged to direct proportion corresponding relation by above-mentioned filter stop bend decay with above-mentioned interference signal intensity.
Concrete, above-mentioned processing module comprises (not shown): the first change submodule and/or the second change submodule; Wherein, above-mentioned the first change module, for when monkey chatter signal strength signal intensity strengthens, increases filter stop bend decay, and filter transition band is passed in band, with the high stopband attenuation upgrading, above-mentioned interference signal is carried out to filtering processing; Above-mentioned the second change module, for when monkey chatter signal strength weakening, reduces filter stop bend decay, and filter transition band is passed outside band, with the low-resistance belt decay of upgrading, above-mentioned interference signal is carried out to filtering processing.
For device embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part is referring to the part explanation of embodiment of the method.
The algorithm providing at this is intrinsic not relevant to any certain computer, virtual system or miscellaneous equipment with demonstration.Various general-purpose systems also can with based on using together with this teaching.According to description above, it is apparent constructing the desired structure of this type systematic.In addition, the present invention is not also for any certain programmed language.It should be understood that and can utilize various programming languages to realize content of the present invention described here, and the description of above language-specific being done is in order to disclose preferred forms of the present invention.
In the specification that provided herein, a large amount of details have been described.Yet, can understand, embodiments of the invention can not put into practice in the situation that there is no these details.In some instances, be not shown specifically known method, structure and technology, so that not fuzzy understanding of this description.
Similarly, be to be understood that, in order to simplify the disclosure and to help to understand one or more in each inventive aspect, in the above in the description of exemplary embodiment of the present invention, each feature of the present invention is grouped together into single embodiment, figure or sometimes in its description.Yet, the method for the disclosure should be construed to the following intention of reflection: the present invention for required protection requires than the more feature of feature of clearly recording in each claim.Or rather, as reflected in claims below, inventive aspect is to be less than all features of disclosed single embodiment above.Therefore, claims of following embodiment are incorporated to this embodiment thus clearly, and wherein each claim itself is as independent embodiment of the present invention.
Those skilled in the art are appreciated that and can the module in the equipment in embodiment are adaptively changed and they are arranged in one or more equipment different from this embodiment.Module in embodiment or unit or assembly can be combined into a module or unit or assembly, and can put them into a plurality of submodules or subelement or sub-component in addition.At least some in such feature and/or process or unit are mutually repelling, and can adopt any combination to combine all processes or the unit of disclosed all features in this specification (comprising claim, summary and the accompanying drawing followed) and disclosed any method like this or equipment.Unless clearly statement in addition, in this specification (comprising claim, summary and the accompanying drawing followed) disclosed each feature can be by providing identical, be equal to or the alternative features of similar object replaces.
In addition, those skilled in the art can understand, although included some feature rather than further feature in these some above-mentioned embodiment comprise other embodiment, the combination of the feature of different embodiment means within scope of the present invention and forms different embodiment.For example, in the following claims, the one of any of embodiment required for protection can be used with compound mode arbitrarily.
All parts embodiment of the present invention can realize with hardware, or realizes with the software module moved on one or more processor, or realizes with their combination.It will be understood by those of skill in the art that and can use in practice microprocessor or digital signal processor (DSP) to realize according to the some or all functions of the some or all parts in the equipment that carries out webpage loading of the embodiment of the present invention.The present invention for example can also be embodied as, for carrying out part or all equipment or device program (, computer program and computer program) of method as described herein.Realizing program of the present invention and can be stored on computer-readable medium like this, or can there is the form of one or more signal.Such signal can be downloaded and obtain from internet website, or provides on carrier signal, or provides with any other form.
It should be noted above-described embodiment the present invention will be described rather than limit the invention, and those skilled in the art can design alternative embodiment in the situation that do not depart from the scope of claims.In the claims, any reference symbol between bracket should be configured to limitations on claims.Word " comprises " not to be got rid of existence and is not listed as element or step in the claims.Being positioned at word " " before element or " one " does not get rid of and has a plurality of such elements.The present invention can be by means of including the hardware of some different elements and realizing by means of the computer of suitably programming.In having enumerated the unit claim of some devices, several in these devices can be to carry out imbody by same hardware branch.The use of word first, second and C grade does not represent any order.Can be title by these word explanations.
Claims (10)
1. realize the method that monkey chatter suppresses, it is characterized in that, comprising:
Monkey chatter signal strength signal intensity in the signal that detection receives;
According to the described monkey chatter signal strength signal intensity detecting, filter is carried out to parameter configuration;
Utilize the filter after described parameter configuration to carry out filtering processing to the described signal receiving, the monkey chatter signal in the signal receiving described in filtering.
2. the method for claim 1, is characterized in that, the monkey chatter signal strength signal intensity in the signal that described detection receives comprises:
The different bandwidth of system baseband filter is set;
The signal power receiving described in detecting respectively in described different bandwidth position;
Calculating high bandwidth position is poor with the corresponding signal power receiving in low bandwidth position, usings this difference as the monkey chatter signal strength signal intensity in the described signal receiving.
3. the method for claim 1, is characterized in that:
Described filter is analog baseband filter or digital baseband filter.
4. the method as described in claim 1 or 3, is characterized in that, the described monkey chatter signal strength signal intensity that described basis detects is carried out parameter configuration to filter and comprised:
Obtain the stopband attenuation of described filter;
When described monkey chatter signal strength signal intensity changes, described filter stop bend decay is set to and described monkey chatter signal strength signal intensity corresponding relation in direct ratio.
5. method as claimed in claim 4, is characterized in that, described filter stop bend decay is set to comprise with described interference signal intensity corresponding relation in direct ratio:
When described monkey chatter signal strength signal intensity strengthens, increase described filter stop bend decay, described filter transition band is passed in band;
When described monkey chatter signal strength weakening, reduce described filter stop bend decay, described filter transition band is passed outside band.
6. realize the device that monkey chatter suppresses, it is characterized in that, comprising:
Detecting unit, for detection of the monkey chatter signal strength signal intensity in the signal receiving;
Dispensing unit, carries out parameter configuration for the monkey chatter signal strength signal intensity detecting according to described detecting unit to filter; And,
Filtering unit, for utilizing the filter of described dispensing unit configuration to carry out filtering processing to the described signal receiving, the monkey chatter signal in the signal receiving described in filtering.
7. device as claimed in claim 6, is characterized in that, described detecting unit comprises:
Module is set, for the different bandwidth of system baseband filter is set;
Go-on-go module, for the signal power receiving described in detecting respectively under the described different bandwidth position that module setting is set; And,
Computing module, for calculating the poor of high bandwidth position and the corresponding signal power receiving in low bandwidth position, usings this difference as the monkey chatter signal strength signal intensity in the described signal receiving.
8. device as claimed in claim 6, is characterized in that,
Described dispensing unit, specifically for carrying out parameter configuration to analog baseband filter or digital baseband filter.
9. the device as described in claim 6 or 8, is characterized in that, described dispensing unit comprises:
Acquisition module, for obtaining the stopband attenuation of described filter;
Processing module, for when described monkey chatter signal strength signal intensity changes, described filter stop bend decay is set to be arranged to direct proportion corresponding relation with described monkey chatter signal strength signal intensity.
10. device as claimed in claim 9, is characterized in that, described processing module comprises:
The first change submodule, for when described monkey chatter signal strength signal intensity strengthens, increases described filter stop bend decay, and described filter transition band is passed in band; And/or,
The second change submodule, for when the described monkey chatter signal strength weakening, reduces described filter stop bend decay, by the passing outside band of described filter transition band.
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| CN110649991A (en) * | 2019-09-26 | 2020-01-03 | 中国人民解放军陆军工程大学 | Signal reconstruction method based on out-of-band nonlinear component convolution inversion |
| CN110649991B (en) * | 2019-09-26 | 2021-11-09 | 中国人民解放军陆军工程大学 | Signal reconstruction method based on out-of-band nonlinear component convolution inversion |
| CN111970024A (en) * | 2020-08-26 | 2020-11-20 | 维沃移动通信有限公司 | Communication network control method and device and electronic equipment |
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