CN101150790A - Method and device for eliminating three-rank interactive modulation interference - Google Patents
Method and device for eliminating three-rank interactive modulation interference Download PDFInfo
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Abstract
The invention provides a third order intermodulation interference eliminating method and a device, wherein, the method comprises following steps: step one, acquiring the carrier frequency range of a multi-carrier wave base station and each carrier frequency range of a plurality of interfered systems; step two, selecting a carrier frequency range which allows to launch synchronously from the carrier frequency range of the multi-carrier wave base station, wherein, the third order intermodulation interference frequency of any two carrier frequencies in the carrier frequency range which allows to launch synchronously is not in any one carrier frequency range of interfered systems. Thereby, eliminating the influence caused by the third order intermodulation interference to other radio communication networks, wherein, the third order intermodulation interference is caused by the multi-carrier wave base station launches carrier waves with different frequencies.
Description
Technical Field
The present invention relates to Global System of Mobile communications (GSM), and more particularly, to a third-order intermodulation interference elimination method and apparatus for controlling a combination of carrier frequencies simultaneously transmitted by a multi-carrier base station (BTS) to eliminate third-order intermodulation interference generated by third-order intermodulation distortion of the multi-carrier base station on a plurality of interfered systems according to characteristics of the third-order intermodulation interference.
Background
In the GSM system, BTS can use a transmitter and a power amplifier in the downstream, and simultaneously transmit several GSM carrier frequencies, and the sharing of hardware can greatly reduce the equipment cost of the BTS system.
However, when more than two different frequency signals act on a nonlinear circuit, the signals are modulated mutually to generate a new frequency signal output, and if the frequency is just within the working channel bandwidth of the receiver of other wireless communication systems, interference to the receiver is formed, and the interference is called cross modulation interference.
Fig. 1 is a diagram of a transmitter producing an intermodulation interference scenario. As shown in fig. 1, BTS1 and BTS2 may belong to different operators, BTS1 communicates with mobile equipment MS1, multi-carrier BTS2 communicates with MS2, MS3 simultaneously via one transmitter, and MS1 is far from BTS1, MS2, MS3 are far from BTS2, and MS1 is close to BTS2.
It is assumed that the intermodulation interference signal frequency generated by the multi-carrier BTS2 transmitter using two carrier frequencies (f 2, f 3) is exactly the same as the receiving frequency f1 of the MS1, affecting the MS1 receiver sensitivity.
Since MS2, MS3 are far away from BTS2, BTS2 will transmit at full power at f2, f3 frequency points. On the other hand, since MS1 is far from BTS1, the downlink signal received by MS1 from BTS1 is very small, and if the third order intermodulation generated by multi-carrier BTS2 is N dB higher than the in-band thermal noise at the receiver of MS1 (N depends on the safety level requirements of the interfered system), it is considered to have an impact on the communication system. Especially when the MS1 belongs to a wireless communication system with high requirements on security, such as a railway specific mobile communication system (GSM-R), this effect is very dangerous, and therefore a method must be provided to avoid this effect and to ensure the security of other wireless communication systems.
When the transmitter transmits two or more different frequency carrier frequencies simultaneously, second order intermodulation distortion, third order intermodulation distortion, etc. are generated concomitantly. Most of the intermodulation distortion can be filtered out (including second-order intermodulation distortion), but when two frequencies of the input signal are close to each other, the third-order intermodulation distortion will be close to the two fundamental frequencies and cannot be easily filtered out. Therefore, the influence of the multi-carrier BTS on other wireless communication systems is reduced, and the influence of third-order intermodulation distortion is avoided most importantly.
Fig. 2 is a schematic diagram of the generation of the third-order intermodulation distortion frequency, as shown in fig. 3, the third-order intermodulation distortion has the following rule: when a multi-carrier BTS transmits two carrier frequencies simultaneously, it is assumed that their frequencies are f1, f2, respectively. The frequencies of the third-order intermodulation distortion generated at this time are (2 f1-f 2) and (2 f2-f 1).
Research proves that the third-order intermodulation frequency can not be influenced as long as the third-order intermodulation frequency does not fall in the frequency band of the wireless communication system near the multi-carrier BTS.
Disclosure of Invention
In view of the problems in the prior art, the present invention provides a third-order intermodulation interference elimination method and apparatus, for controlling the combination of carrier frequencies simultaneously transmitted by a multi-carrier base station (BTS) to eliminate the third-order intermodulation interference generated by the third-order intermodulation distortion of the multi-carrier base station to multiple interfered systems according to the characteristics of the third-order intermodulation interference.
One aspect of the present invention provides a third-order intermodulation interference elimination method, comprising the following steps: step one, obtaining a carrier frequency range of a multi-carrier base station and respective carrier frequency ranges of a plurality of interfered systems; and step two, selecting a carrier frequency range allowing simultaneous transmission from the carrier frequency ranges of the multi-carrier base station, wherein the third-order intermodulation interference frequency of any two carrier frequency frequencies in the carrier frequency range allowing simultaneous transmission is not in the carrier frequency range of any one of the interfered systems.
The third-order intermodulation interference frequency is the difference between the second carrier frequency and the double of the first carrier frequency of the carrier frequencies allowed to be transmitted simultaneously, and the difference between the first carrier frequency and the double of the second carrier frequency of the carrier frequencies allowed to be transmitted simultaneously, wherein the first carrier frequency and the second carrier frequency are any carrier frequencies in the carrier frequency range allowed to be transmitted simultaneously.
Before the first step, a thermal noise threshold of the interfered system is preset; obtaining the maximum third-order intermodulation interference and thermal noise of the multi-carrier base station to the interfered system; judging whether the difference between the maximum third-order intermodulation interference and the thermal noise is greater than a thermal noise threshold value; if the judgment result is yes, the multi-carrier base station generates third-order intermodulation interference to the interfered system; and if the judgment result is negative, the carrier frequency range of the interfered system is the carrier frequency range of the multi-carrier base station.
The maximum third-order intermodulation interference is the third-order intermodulation interference generated when the multi-carrier base station transmits carriers with different frequencies at the maximum power at the same time, and the thermal noise threshold is related to the safety requirement level of the interfered system.
Then, executing the first step to the second step to other interfered systems in the plurality of interfered systems, thereby obtaining the allowed simultaneous transmission carrier frequency range of each multi-carrier base station corresponding to the interfered systems; calculating the intersection of a plurality of allowed simultaneous transmission carrier frequency ranges to obtain an allowed concurrent frequency range of the multi-carrier base station; and when the number of the available carrier frequencies in the allowable concurrent frequency range is zero, moving the multi-carrier base station out of the current site.
The interfered system at least comprises: signal transmitting devices, signal receiving devices, and mobile wireless devices.
The invention also provides a third-order intermodulation interference clearing device, which comprises: a frequency acquisition module, configured to acquire a carrier frequency range of a multi-carrier base station and a carrier frequency range of one of multiple interfered systems; and the allowed frequency calculation module is connected with the frequency acquisition module and used for selecting a carrier frequency range which is allowed to be simultaneously transmitted from the carrier frequency ranges of the multi-carrier base station, wherein the third-order intermodulation interference frequency of any two carrier frequency frequencies in the carrier frequency range which is allowed to be simultaneously transmitted is not in the carrier frequency range of one of the interfered systems.
The third-order intermodulation interference frequency is the difference between the second carrier frequency and the double of the first carrier frequency of the carrier frequencies allowed to be transmitted simultaneously, and the difference between the first carrier frequency and the double of the second carrier frequency of the carrier frequencies allowed to be transmitted simultaneously, wherein the first carrier frequency and the second carrier frequency are any carrier frequencies in the carrier frequency range allowed to be transmitted simultaneously.
The device also includes: the threshold setting module is used for setting a thermal noise threshold of the interfered system; the maximum third-order intermodulation interference obtaining module is used for obtaining the maximum third-order intermodulation interference and the thermal noise of the multi-carrier base station to the interfered system; the judging module is used for judging whether the difference between the maximum three-order intermodulation interference and the thermal noise is greater than a thermal noise threshold value; and the determining device is used for determining that the multi-carrier base station generates third-order intermodulation interference on the interfered system when the judging result is yes, and determining that the carrier frequency range of the interfered system is the carrier frequency range of the multi-carrier base station when the judging result is no.
The maximum third-order intermodulation interference is the third-order intermodulation interference generated when the multi-carrier base station transmits carriers with different frequencies at the maximum power at the same time, and the thermal noise threshold is related to the safety requirement level of the interfered system.
In addition, the apparatus further comprises: a circulating module for returning to the frequency acquisition module to obtain a frequency range of carrier frequencies allowed to be transmitted simultaneously by each of the plurality of interfered systems; the intersection calculation module is used for calculating the intersection of a plurality of allowed carrier frequency ranges to be transmitted simultaneously so as to obtain the allowed concurrent frequency range of the multi-carrier base station; and the site clearing device is used for moving the multi-carrier base station out of the current site when the allowable concurrent frequency range is zero.
The interfered system of the invention at least comprises: a signal transmitting device, a signal receiving device, and a transit path.
Therefore, the invention can eliminate the influence of the three-order intermodulation interference generated by the multi-carrier base station due to the simultaneous emission of carriers with different frequencies on other wireless communication systems, thereby ensuring the safety of the wireless communication system with high safety requirement.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a diagram of a transmitter producing intermodulation interference situations;
FIG. 2 is a schematic diagram of the generation of third order intermodulation distortion frequencies;
FIG. 3 is a flow chart of a third order intermodulation interference cancellation method according to the present invention;
FIG. 4 is a flow chart of a method according to an embodiment of the invention;
fig. 5 is a block diagram of a third order intermodulation interference cancellation apparatus according to the present invention; and
fig. 6 is a diagram of a spectrum allocation scenario for third-order intermodulation interference to which the present invention is applied.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it should be understood that they are described herein only for the purpose of illustrating and explaining the present invention and are not intended to limit the present invention.
Fig. 3 is a flowchart of a third order intermodulation interference cancellation method according to the present invention. As shown in fig. 3, the method comprises the following steps:
step S302, obtaining carrier frequency range of multi-carrier base station and respective carrier frequency range of multiple interfered systems; and
step S304, selecting the carrier frequency range allowing simultaneous transmission in the carrier frequency range of the multi-carrier base station.
Wherein the third order intermodulation interference frequency of any two carrier frequencies within the carrier frequency range allowing simultaneous transmission is not within the carrier frequency range of any one of the interfered systems.
The third-order intermodulation interference frequency of any two carrier frequencies in the carrier frequency range allowing simultaneous transmission is the difference between the double of the first carrier frequency and the second carrier frequency of the carrier frequency allowing simultaneous transmission and the difference between the double of the second carrier frequency and the first carrier frequency of the carrier frequency allowing simultaneous transmission, wherein the first carrier frequency and the second carrier frequency are any carrier frequencies in the carrier frequency range allowing simultaneous transmission.
Before step S302, a thermal noise threshold of the interfered system is also preset; obtaining the maximum third-order intermodulation interference and thermal noise of the multi-carrier base station to the interfered system; judging whether the difference between the maximum third-order intermodulation interference and the thermal noise is greater than a thermal noise threshold value; if the judgment result is yes, the multi-carrier base station generates third-order intermodulation interference to the interfered system; and if the judgment result is negative, the carrier frequency range of the interfered system is the carrier frequency range of the multi-carrier base station.
The maximum third-order intermodulation interference is the third-order intermodulation interference generated when the multi-carrier base station transmits carriers with different frequencies at the maximum power at the same time, and the thermal noise threshold is related to the safety requirement level of the interfered system.
Then, the steps are executed for other interfered systems in the plurality of interfered systems, so that the frequency range of the carrier frequency allowed to be transmitted simultaneously in each of the plurality of interfered systems is obtained; calculating the intersection of a plurality of allowed simultaneous transmission carrier frequency ranges to obtain an allowed concurrent frequency range of the multi-carrier base station; and when the number of the available carrier frequencies in the allowable concurrent frequency range is zero, moving the multi-carrier base station out of the current site.
The interfered system at least comprises: signal transmitting devices, signal receiving devices, and mobile wireless devices.
Fig. 4 is a flow chart of a method according to an embodiment of the invention. As shown in fig. 4, the method specifically includes the following steps:
s402, obtaining that A interfered systems (including all signal transmitting and receiving equipment and possible paths thereof) exist around the multi-carrier BTS;
s404, if a =0, ending, otherwise, performing step S406;
s406, setting a count variable i =1;
s408, obtaining a supporting frequency band [ f1, f2] of the multi-carrier base station;
s410, measuring or calculating the thermal noise Nbi of the multi-carrier BTS at an IM3i generated by an interfered system i and the interfered system i, and setting a thermal noise threshold Ni (dB) of the interfered system i;
s412, judging whether the maximum third-order cross modulation interference IM3i generated by the multi-carrier BTS at the interference system i meets the following requirements: IM3i-Nbi > Ni, if not, fi = [ f1, f2], turning to step S418, otherwise, executing step S414;
s414, obtaining a frequency band [ F1, F2] i used by the interfered system i;
s416, in the carrier frequency set Si allowed to be transmitted simultaneously by the multi-carrier BTS, any two different elements Sx, sy satisfy: sx, sy belong to [ F1, F2], and 2Sx-Sy,2Sx-Sy do not belong to [ F1, F2] i;
s418, judging whether A > i is true, if yes, i = i +1, turning to the step S410, otherwise, executing the step S420;
s420, finally pass through
Obtaining the allowed concurrent carrier frequency range of the multi-carrier BTS at the site:
and S422, judging whether the S is empty, if so, judging that the site does not allow the multi-carrier BTS of the frequency band to be placed, and ending, otherwise, outputting the S.
Fig. 5 is a block diagram of a third-order intermodulation interference cancellation apparatus 500 according to the present invention. As shown in fig. 5, the apparatus includes: a frequency obtaining module 502, configured to obtain a carrier frequency range of a multi-carrier base station and a carrier frequency range of one of multiple interfered systems; and an allowed frequency calculation module 504, connected to the frequency acquisition module 502, for selecting a carrier frequency range allowing simultaneous transmission from the carrier frequency ranges of the multi-carrier base station, wherein a third-order intermodulation interference scrambling rate of any two carrier frequencies within the carrier frequency range allowing simultaneous transmission is not within the carrier frequency range of one of the interfered systems.
The third-order intermodulation interference frequency is the difference between the double of the first carrier frequency and the second carrier frequency in the carrier frequency range which allows simultaneous transmission, and the difference between the double of the second carrier frequency and the first carrier frequency in the carrier frequency range which allows simultaneous transmission, wherein the first carrier frequency and the second carrier frequency are any carrier frequency in the carrier frequency range which allows simultaneous transmission.
The device also includes: the threshold setting module is used for setting a thermal noise threshold of the interfered system; the maximum third-order intermodulation interference acquisition module is used for acquiring the maximum third-order intermodulation interference and the thermal noise of the multi-carrier base station to the interfered system; the judging module is used for judging whether the difference between the maximum three-order intermodulation interference and the thermal noise is greater than a thermal noise threshold value; and the determining device is used for determining that the multi-carrier base station generates third-order intermodulation interference on the interfered system when the judgment result is yes, and determining that the carrier frequency range of the interfered system is the carrier frequency range of the multi-carrier base station when the judgment result is no.
The maximum third-order intermodulation interference is the third-order intermodulation interference generated when the multi-carrier base station transmits carriers of different frequencies at the same time with the maximum power, and the thermal noise threshold value is related to the safety requirement level of the interfered system.
In addition, the apparatus further comprises: a circulating module for returning to the frequency acquisition module to obtain a frequency range of carrier frequencies allowed to be transmitted simultaneously by each of the plurality of interfered systems; the intersection calculation module is used for calculating the intersection of a plurality of allowed carrier frequency ranges to be transmitted simultaneously so as to obtain the allowed concurrent frequency range of the multi-carrier base station; and the site clearing device is used for moving the multi-carrier base station out of the current site when the allowable concurrent frequency range is zero.
The interfered system of the invention at least comprises: a signal transmitting device, a signal receiving device, and a transit path.
Fig. 6 is a diagram of a spectrum allocation scenario for third-order intermodulation interference to which the present invention is applied. As shown in fig. 6, the wireless spectrum allocation situation is around 900MHz in china. When China moves to use multi-carrier BTS of the spectrum range [935, 954] of the GSM 900 system, GSM-R [930, 935] of China iron-through nearby the BTS will be affected.
At this time, the multi-carrier BTS is controlled to allow the carrier frequency set S to be transmitted simultaneously, so that the inter-modulation interference frequency generated by any two carrier frequencies is met and does not fall in the range of 930-935 MHz, the GSM-R system with high safety requirement can be ensured not to be influenced by the fact that the multi-carrier BTS transmits the carrier frequencies of a plurality of frequencies simultaneously, and the safe operation of the train is ensured.
In summary, the present invention provides a solution for protecting other wireless communication systems from being affected by controlling the multi-carrier BTS system to allow simultaneous transmission of carrier frequency and frequency combination ranges. The invention is also suitable for eliminating the cross modulation interference generated by other wireless communication system multi-carrier equipment.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A third order intermodulation interference eliminating method is used for controlling the combination of carrier frequency which is simultaneously transmitted by a multi-carrier base station to eliminate the third order intermodulation interference generated by the third order intermodulation distortion of the multi-carrier base station to a plurality of interfered systems according to the characteristics of the third order intermodulation interference, and is characterized by comprising the following steps:
step one, obtaining a carrier frequency range of the multi-carrier base station and respective carrier frequency ranges of the multiple interfered systems; and
step two, selecting the frequency range of carrier frequency allowing to transmit simultaneously from the frequency range of carrier frequency of the multi-carrier base station,
wherein the third order intermodulation interference frequency of any two carrier frequency frequencies within the carrier frequency range allowed to be simultaneously transmitted is not within the carrier frequency range of any one of the interfered systems.
2. The method of claim 1, wherein the third order intermodulation interference frequencies are a difference between twice a first carrier frequency and a second carrier frequency of the carrier frequencies allowed to be simultaneously transmitted, and a difference between twice the second carrier frequency and the first carrier frequency of the carrier frequencies allowed to be simultaneously transmitted,
wherein the first carrier frequency and the second carrier frequency are any carrier frequency within the carrier frequency range allowing simultaneous transmission.
3. The method according to claim 2, characterized in that before said step one, the following is performed:
presetting a thermal noise threshold of the interfered system;
obtaining the maximum third-order intermodulation interference and thermal noise of the multi-carrier base station to the interfered system;
judging whether the difference between the maximum third-order intermodulation interference and the thermal noise is greater than the thermal noise threshold value;
if the judgment result is yes, the multi-carrier base station generates the third-order intermodulation interference to the interfered system; and
and if the judgment result is negative, the carrier frequency range of the interfered system is the carrier frequency range of the multi-carrier base station.
4. The method of claim 3, wherein the maximum third-order intermodulation interference is the third-order intermodulation interference generated when the multi-carrier base station simultaneously transmits different frequency carriers at maximum power, and
the thermal noise threshold is related to a level of security requirements of the disturbed system.
5. The method of claim 1, further comprising:
performing the first to second steps on other interfered systems in the plurality of interfered systems, thereby obtaining a carrier frequency range allowed to be simultaneously transmitted by each multi-carrier base station corresponding to the interfered systems;
calculating the intersection of a plurality of allowed simultaneous transmission carrier frequency ranges to obtain an allowed concurrent frequency range of the multi-carrier base station; and
and when the number of the available carriers in the allowed concurrent frequency range is zero, moving the multi-carrier base station out of the current site.
6. The method of claim 1, wherein the interfered system comprises at least: signal transmitting devices, signal receiving devices, and paths that may be traversed by the mobile wireless device.
7. A third order intermodulation interference clearing device, for controlling the combination of carrier frequency transmitted by a multi-carrier base station at the same time to eliminate the third order intermodulation interference generated by the third order intermodulation distortion of the multi-carrier base station to a plurality of interfered systems according to the characteristics of the third order intermodulation interference, is characterized by comprising:
a frequency obtaining module, configured to obtain a carrier frequency range of the multi-carrier base station and a carrier frequency range of one of the multiple interfered systems; and
an allowed frequency calculation module, connected to the frequency acquisition module, for selecting a carrier frequency range allowing simultaneous transmission among the carrier frequency ranges of the multi-carrier base station,
wherein a third order intermodulation interference frequency of any two carrier frequencies within the carrier frequency range allowed to be simultaneously transmitted is not within the carrier frequency range of one of the interfered systems.
8. The apparatus of claim 7, wherein the third order intermodulation interference frequencies are a difference between twice a first carrier frequency and a second carrier frequency of the carrier frequencies allowed to be simultaneously transmitted, and a difference between twice the second carrier frequency and the first carrier frequency of the carrier frequencies allowed to be simultaneously transmitted,
wherein the first carrier frequency and the second carrier frequency are any carrier frequencies within the carrier frequency range that allows simultaneous transmission.
9. The apparatus of claim 8, further comprising:
a threshold setting module for setting a thermal noise threshold of the interfered system;
a maximum third-order intermodulation interference obtaining module, configured to obtain maximum third-order intermodulation interference and thermal noise of the multicarrier base station to the interfered system;
the judging module is used for judging whether the difference between the maximum third-order intermodulation interference and the thermal noise is larger than the thermal noise threshold value; and
and the determining device is used for determining that the multi-carrier base station generates the third-order intermodulation interference on the interfered system when the judgment result is yes, and determining that the carrier frequency range of the interfered system is the carrier frequency range of the multi-carrier base station when the judgment result is no.
10. The apparatus of claim 6, further comprising:
a circulating module, configured to return to the frequency obtaining module to obtain a frequency range of carrier frequencies allowed to be transmitted simultaneously by each of the multiple interfered systems;
the intersection calculation module is used for calculating the intersection of a plurality of allowed simultaneous transmission carrier frequency ranges to obtain the allowed concurrent frequency range of the multi-carrier base station;
and the site clearing device is used for moving the multi-carrier base station out of the current site when the allowed concurrent frequency range is zero.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101637337A CN101150790B (en) | 2007-10-23 | 2007-10-23 | Method and device for eliminating three-rank interactive modulation interference |
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| CN2007101637337A CN101150790B (en) | 2007-10-23 | 2007-10-23 | Method and device for eliminating three-rank interactive modulation interference |
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| CN101150790B CN101150790B (en) | 2012-07-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101657010B (en) * | 2009-09-16 | 2012-02-08 | 中兴通讯股份有限公司 | Assessment method and device of intermodulation interference |
| WO2013022817A1 (en) * | 2011-08-10 | 2013-02-14 | Raytheon Company | Dynamic spectrum access for networked radios |
| CN103476128A (en) * | 2013-08-21 | 2013-12-25 | 国家无线电监测中心 | Method for mounting mobile communication route inside rail transport compartment adopting CBTC (communication based train control) system |
| CN110311706A (en) * | 2019-04-23 | 2019-10-08 | 维沃移动通信有限公司 | A kind of interference processing method and mobile terminal |
-
2007
- 2007-10-23 CN CN2007101637337A patent/CN101150790B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101657010B (en) * | 2009-09-16 | 2012-02-08 | 中兴通讯股份有限公司 | Assessment method and device of intermodulation interference |
| WO2013022817A1 (en) * | 2011-08-10 | 2013-02-14 | Raytheon Company | Dynamic spectrum access for networked radios |
| US8818284B2 (en) | 2011-08-10 | 2014-08-26 | Raytheon Company | Dynamic spectrum access for networked radios |
| CN103476128A (en) * | 2013-08-21 | 2013-12-25 | 国家无线电监测中心 | Method for mounting mobile communication route inside rail transport compartment adopting CBTC (communication based train control) system |
| CN103476128B (en) * | 2013-08-21 | 2016-04-20 | 国家无线电监测中心 | The method of mobile communication route is set up in the rail transit cars adopting CBTC system |
| CN110311706A (en) * | 2019-04-23 | 2019-10-08 | 维沃移动通信有限公司 | A kind of interference processing method and mobile terminal |
| CN110311706B (en) * | 2019-04-23 | 2021-09-14 | 维沃移动通信有限公司 | Interference processing method and mobile terminal |
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| Publication number | Publication date |
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| CN101150790B (en) | 2012-07-04 |
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