CN103957025A - Method for solving stray interference of DCS1800 base station on Band 39 - Google Patents
Method for solving stray interference of DCS1800 base station on Band 39 Download PDFInfo
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- CN103957025A CN103957025A CN201410182171.0A CN201410182171A CN103957025A CN 103957025 A CN103957025 A CN 103957025A CN 201410182171 A CN201410182171 A CN 201410182171A CN 103957025 A CN103957025 A CN 103957025A
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Abstract
The invention discloses a method for solving stray interference of a DCS1800 base station on a Band 39. The technical parameters of a resonance cavity of an emitting band pass TXBP of the DCS1800 base station are adjusted to enable the frequency of the emitting band pass TXBP to range from 1805 MHz to 1870 MHz. The emitting band pass TXBP of the resonance cavity of the DCS1800 base station is adjusted, and therefore the stray interference on the Band 39 (F frequency) is effectively reduced; the out-band stray power is reduced to -99.11 dBm from -54.84 dBm and can be effectively reduced by at least 42 dB, and the purpose of avoiding the stray interference of the DCS1800 base station on the Band 39 is achieved without adding inactive devices.
Description
Technical field
The present invention relates to the communications field, particularly, relate to the clutter interference method of a kind of solution DCS1800 base station to Band39 (F-band).
Background technology
At present, (hereinafter to be referred as the China Mobile) DCS1800 of communication group company of China Mobile base station carrier downlink working frequency range is 1805MHz-1830MHz, but the band limits of the logical TXBP of the band of its transmitter is 1805MHz-1880MHz, according to ETSI code requirement, the band stray of DCS1800 transmitter should <-36dBm, (referring to GSM11.21The GSM Base Station System (BSS) equipment specification6.6.1.3), by magnanimity, measure, the spuious output in the DCS1800 of China Mobile base station falls into the requirement that TD-LTE/TD-SCDMA Band39 (F-band) all meets ETSI standard, Fig. 1 is common measured data.
The a lot of DCS1800 of China Mobile base station is built location altogether with TD-LTE/TD-SCDMA Band39 base station, antenna is arranged on same terrace, the transmitting of DCS base station need to have certain isolation just can evade clutter interference with the reception of TD-LTE/TD-SCDMA Band39 base station, disturbs schematic diagram as shown in Figures 2 and 3.
The isolation demand that A in Fig. 2, B are 2 is calculated as follows:
The reception noise requirements that B is ordered: according to the requirement of TD-LTE receiver, when sensitivity decline 0.8dB, the interference level of receiving is wanted <-124dBm/RB, i.e. <-121dBm@RBW=100KHz;
The isolation requirement that B is 2: according to actual measurement, it is spuious that A point (transmitting of DCS base station) drops on Band39 low side (near 1880MHz) is-55dBm, the insulated degree requirement that A, B are 2 is-55dBm-(121dBm)=66dB.
According to actual measurement, DCS1800 base station is to the most of not enough 60dB of the isolation of TD-LTE/TD-SCDMA Band39 (F-band) base station, and space isolation can not meet requirement, the uplink interference data sectional drawing that the Tu4Shi TD-LTE OMC of operation maintenance center reads on backstage.
In Fig. 4, NI represents at the bottom of receiver, to make an uproar+disturb, in the situation that not disturbing, and interference threshold NI≤-117dBm, Fig. 4 interference level exceeds thresholding 30dB.
Existing conventional settling mode is evaded the clutter interference to Band39 (F-band) for installing band pass filter (BPF) solution DCS1800 base station TXBP additional, but the shortcoming of this mode is filter belongs to passive device, be added in network and belong to and increase a fault point newly, and filter has the newly-increased Insertion Loss of 1dB left and right, DCS coverage is had a certain impact, have the hidden danger that device fault cannot be monitored, Purchasing Quality (material, power carrying, Insertion Loss, intermodulation, standing-wave ratio) is difficult to handle control.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of clutter interference method of DCS1800 base station to Band39 that solve, to realize under the prerequisite that does not increase any inactive component, avoid the advantage of DCS1800 base station to the clutter interference of Band39 (F-band).
For achieving the above object, the technical solution used in the present invention is:
Solve the clutter interference method of DCS1800 base station to Band39,
The technical parameter of adjusting the resonant cavity of DCS1800 base station emission bandpass TXBP, making its emission bandpass TXBP is 1805MHz--1870MHz.
According to a preferred embodiment of the invention, the technical parameter of the resonant cavity of above-mentioned adjustment DCS1800 base station emission bandpass TXBP is specially: by adjusting the tuning double-screw bolt of DCS1800 base station emission bandpass, emission bandpass is regulated, and use vector network analyzer to measure parameters such as band passband rate, Insertion Loss, power inhibition and return losses.
Technical scheme of the present invention has following beneficial effect:
Technical scheme of the present invention, by the emission bandpass of the resonant cavity of DCS1800 base station emission bandpass TXBP is regulated, thereby make effectively to be reduced in the clutter interference of Band39 (F-band), the power of band stray is from-be reduced to-99.11dBm of 54.84dBm, can effectively reduce at least more than 42dB, thereby reach under the prerequisite that does not increase any inactive component, avoid the object of DCS1800 base station to the clutter interference of Band39.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the band stray actual measurement schematic diagram of DCS1800 base station TXBP;
Fig. 2 and Fig. 3 are the clutter interference schematic diagram of DCS1800 base station to Band39;
Fig. 4 is the NI statistical chart that is subject to clutter interference LTE community, DCS1800 base station;
Fig. 5 is band stray power diagram after adjustment DCS1800 base station TXBP;
Fig. 6 is the structural representation of DCS1800 base station emission bandpass TXBP;
Fig. 7 is DCS1800 base station TXBP vector network analyzer survey map before adjusting;
Fig. 8 is vector network analyzer survey map after commissioning DCS1800 base station TXBP completes;
Fig. 9 is for adjusting the front clutter interference design sketch to Band39 (F-band) of DCS1800 base station TXBP;
Figure 10 is the clutter interference design sketch to Band39 (F-band) after tune DCS1800 base station TXBP.
By reference to the accompanying drawings, in the embodiment of the present invention, Reference numeral is as follows:
The tuning double-screw bolt of 1-; 2-hold-down nut; 3-emission bandpass TXBP.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
Solve the clutter interference method of DCS1800 base station to Band39,
The technical parameter of adjusting the resonant cavity of DCS1800 base station emission bandpass TXBP, making its emission bandpass is 1805MHz--1870MHz, and comprises endpoints thereof.
Wherein, the technical parameter of adjusting the resonant cavity of DCS1800 base station emission bandpass TXBP is specially: by adjusting the tuning double-screw bolt of DCS1800 emission bandpass TXBP, emission bandpass is regulated, and use vector network analyzer to enter to measure to parameters such as band passband rate frequency, Insertion Loss, power inhibition and return losses.
Table one, GSM base station system TX/RX emission bandpass parameter list:
| ? | TX： | RX： |
| P-GSM900 | 935MHz?to?960?MHz | 890?MHz?to?915?MHz |
| DCS1800 | 1805?MHz?to?1880?MHz | 1710?MHz?to?1785?MHz |
| E-GSM920 | 925?MHz?to?960?MHz | 880?MHz?to?915?MHz |
| T-GSM900 | 921?MHz?to?960?MHz | 876?MHz?to?915?MHz |
| GSM450 | 460，4?MHz?to?467，6?MHz | 450，4?MHz?to?457，6?MHz |
| GSM480 | 480，8?MHz?to?496?MH | 478.8?MHz?to?486?MHz |
| GSM850?and?MXM?850 | 869?MHz?to?894?MHz | 824?MHz?to?849?MHz |
| PCS?1900?and?MXM?1900 | 1930?MHz?to?1990?MHz | 1850?MHz?to?1910?MHz |
GSM base station system TX/RX emission bandpass parameter rule as shown in Table 1, by adjusting the technical parameter of the resonant cavity of DCS1800 base station TXBP in existing network, not affecting on the basis of current the used mobile GSM transmit frequency band (1805MHz-1830MHz) of China Mobile, evade the clutter interference to Band39 (F-band);
In advantage Shi Dui China Mobile existing network, do not increase any inactive component, the TXBP that just adjusts the DCS1800 base station of existing network use reaches the feature of evading the clutter interference of Band39 (F-band).
Its clutter interference at Band39 (F-band) is effectively reduced, the power of band stray is from show-be reduced to-99.11dBm of 54.84dBm of figure tetra-, can effectively reduce at least more than 42dB, meet China Mobile completely to the spuious requirement of Band39 (F-band), the stray power after adjustment as shown in Figure 5;
Commissioning process, actual commissioning requirements is used vector network analyzer (VSA), by the tuning double-screw bolt in rotation diagram 6, amounts to 25 tuning double-screw bolts, reaches desired technical indicator, and DCS1800 emission bandpass TXBP sketch is as shown in Figure 6.
The technical parameter of the resonant cavity of table two, adjustment DCS1800 base station emission bandpass TXBP requires table:
Before adjustment, namely descending the seeing shown in a curve Tr2 in Fig. 7 with passband section of TXBP of DCS base station in current China Mobile existing network, band leads to for 1805-1880MHz (seeing frequency marking △ 3 and the △ 6 of Fig. 7)
After adjustment, the descending band passband section of TXBP of DCS base station is shown in Fig. 8 shown in a curve Tr2, by the logical 1805-1870MHz (seeing frequency marking △ 3 and △ 4) that adjusts to of original 1805-1880MHz band, useless and the harmful 1880MHz frequency of Band39F frequency range is suppressed to reach-42.672dB (seeing frequency marking △ 6) to DCS1800, simultaneously, can support the 1850-1870MHz high-end frequency range of 20M altogether, not affect the use of the high-end frequency range of DCS1800 (1850MHz--1870MHz).
From Fig. 9 and Figure 10, can find out, by adjusting DCS1800 base station emission bandpass TXBP, can effectively reduce the impact on Band39 (F-band 1880MHz--1900MHz) clutter interference, make to be all reduced at Band39 (F-band 1880MHz--1900MHz) clutter interference power-below 116dBm.
Adjust DCS1800 emission bandpass TXBP to evade the clutter interference of Band39 (F-band) and tradition are added to spuious filter contrast to have the following advantages, as shown in Table 3,
Table three: adjust DCS1800 emission bandpass TXBP to add spuious filter contrast table to the clutter interference of Band39 (F-band) and tradition:
By adjusting DCS1800 emission bandpass TXBP (having the logical 1805-1870MHz that adjusts to of original 1805-1880MHz band); the Out-of-band rejection of increase to Band39 (F-band 1880MHz--1900MHz) is by adjusting the emission bandpass of DCS1800TXBP, all to belong to the protection range of the technical program to implementing evading of the spuious scheme of Band39 (F-band 1880MHz--1900MHz).
Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. solve the clutter interference method of DCS1800 base station to Band39, it is characterized in that,
The technical parameter of adjusting the resonant cavity of DCS1800 base station emission bandpass TXBP, making its emission bandpass TXBP is 1805MHz--1870MHz.
2. the clutter interference method of solution according to claim 1 DCS1800 base station to Band39, it is characterized in that, the technical parameter of the resonant cavity of above-mentioned adjustment DCS1800 base station emission bandpass TXBP is specially: by adjusting the tuning double-screw bolt of DCS1800 base station emission bandpass TXBP, emission bandpass is regulated, and use vector network analyzer to measure band passband rate, Insertion Loss, power inhibition and return wave loss parameter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130672A (en) * | 2016-06-01 | 2016-11-16 | 乐视控股（北京）有限公司 | Interference detection method and device |
| CN106162681A (en) * | 2015-03-24 | 2016-11-23 | 中国移动通信集团公司 | The detection method of a kind of GSM900 second harmonic interference and device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203013894U (en) * | 2012-11-16 | 2013-06-19 | 丹阳华神电器有限公司 | Five-system eight-frequency combiner |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203013894U (en) * | 2012-11-16 | 2013-06-19 | 丹阳华神电器有限公司 | Five-system eight-frequency combiner |
Non-Patent Citations (1)
| Title |
|---|
| HARESTCHEN: "TDD-LTE上行干扰定位方法与排查指导手册", 《百度文库》, 11 April 2014 (2014-04-11), pages 22 - 25 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106162681A (en) * | 2015-03-24 | 2016-11-23 | 中国移动通信集团公司 | The detection method of a kind of GSM900 second harmonic interference and device |
| CN106162681B (en) * | 2015-03-24 | 2019-10-01 | 中国移动通信集团公司 | A kind of detection method and device of GSM900 second harmonic interference |
| CN106130672A (en) * | 2016-06-01 | 2016-11-16 | 乐视控股（北京）有限公司 | Interference detection method and device |
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| CN103957025B (en) | 2016-03-30 |
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