CN102170690A - A gain control method of a WCDMA radio remote unit - Google Patents
A gain control method of a WCDMA radio remote unit Download PDFInfo
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- CN102170690A CN102170690A CN2011100987429A CN201110098742A CN102170690A CN 102170690 A CN102170690 A CN 102170690A CN 2011100987429 A CN2011100987429 A CN 2011100987429A CN 201110098742 A CN201110098742 A CN 201110098742A CN 102170690 A CN102170690 A CN 102170690A
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- wcdma radio
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Abstract
The invention discloses a gain control method of a WCDMA radio remote unit and the method comprises the steps of setting a threshold value P0; receiving uplink signals and acquiring carrier signals after performing channel separation on the uplink signals; summing up a power difference value P of the carrier signals in a predetermined second time interval; comparing the P with the P0, and if the P is less than the P0, reducing the uplink gain of the WCDMA radio remote unit by G2. The gain control method employs uplink noise suspension and improves the sensitivity of a base station, thereby enabling the WCDMA radio remote unit to realize a coverage extended as much as possible and reduce the background noise uplift of the base station.
Description
Technical field
The present invention relates to wireless communication field, be specifically related to a kind of WCDMA radio frequency stretch system gain control method.
Background technology
The WCDMA network can be divided into three parts basically: user terminal, wireless access network and core net.Wherein, wireless access network comprises radio network controller and Node B.Node B base station signal is gone out signal radiation by antenna-feedback system, the coverage goal zone.But the unavoidable chlamydate weak district of base station coverage mode, blind area, this mobile communications network that improves day by day for quality of service requirement is a general difficult problem.In the prior art, use WCDMA radio frequency stretch system (WRRU) to draw Node B signal, with its amplification, the coverage goal zone.WRRU can enlarge base station range, eliminates coverage hole, solves the covering problem of indoor or special screne.The basic principle of repeater: " amplify the base station signal that receives and give the user, the terminal signaling that receives is amplified return the base station simultaneously ".The lifting to some extent so the direct end uplink signal is made an uproar at the bottom of to original base station.
But existing WRRU self function is perfect inadequately, directly influences its use in various scenes.According to the computing formula of making an uproar at the bottom of the base station: No=KTBNR, K is a Boltzmann constant, and T is a temperature, and B is a system bandwidth.Preceding two is definite value, wherein NR is the noise of signal itself, this index has relation with regard to the quantity that carries source device with the base station, because each active equipment all can have thermal noise, individual noise factor is all arranged, whenever, will improve a bit, make an uproar at the bottom of the base station to have raised and to reduce the sensitivity of base station through an active equipment NR.
Existing WRRU is too high to the lifting of making an uproar of the end of base station, reduces the sensitivity of base station, and its lifting amount of making an uproar at the bottom of to the base station can superpose when many WRRU equipment of cascade, thereby has limited the cascade device number of WRRU.
Summary of the invention
The invention discloses a kind of WCDMA radio frequency stretch system gain control method, can suppress upstream noise, improve the sensitivity of base station.
A kind of WCDMA radio frequency stretch system gain control method comprises:
Power difference threshold value P0 is set;
Receive upward signal, described upward signal is carried out obtaining carrier signal after the channel separation;
Add up the power difference P of described carrier signal in second time interval T4 that sets;
Described P and described P0 are compared, and less than described P0, then the up gain with the WCMDA radio frequency stretch system reduces G2 as if described P, and described G2 is the variation pre-value of predefined up gain.
The present invention is provided with a power difference threshold value P0 in the WRRU system, the carrier signal that the upward signal that system is received carries out obtaining after the channel separation is carried out power statistic, the power difference of statistical signal in the time interval of setting, when the power difference that counts on during less than the power difference threshold value of preset value, (it is to transfer survey in order to avoid equipment that difference is compared, the influence that conditions such as variations in temperature are brought, more accurate) system reduces the up gain of self automatically, be exaggerated the purpose that returns to the base station to reach the inhibition upstream noise, reduced lifting, improved the sensitivity of base station making an uproar at the bottom of the base station.
Description of drawings
Fig. 1 is one embodiment of the present of invention schematic diagrames;
Fig. 2 is an alternative embodiment of the invention schematic diagram;
Fig. 3 is the present invention's schematic diagram during cascade in actual applications.
Embodiment
For a better understanding of the present invention, introduce embodiments of the invention below,, comprise step referring to Fig. 1:
101, power difference threshold value is set;
Power difference threshold value P0 is set.
102, carry out channel separation;
Receive upward signal, upward signal is carried out obtaining carrier signal after the channel separation.
103, difference power primary system meter;
The power difference P of statistics carrier signal in second time interval T4 that sets.
104, the power difference relatively;
P and P0 are compared.
105, reduce up gain.
If P is less than P0, then the up gain with the WCMDA radio frequency stretch system reduces G2, and G2 is the variation pre-value of predefined up gain.
The present invention is provided with a power difference threshold value P0 in the WRRU system, the carrier signal that the upward signal that system is received carries out obtaining after the channel separation is carried out power statistic, the power difference of statistical signal in the time interval of setting, when the power difference that counts on during less than the power difference threshold value of preset value, (it is to transfer for fear of equipment to survey that difference is compared, the influence that conditions such as variations in temperature are brought, more accurate) system reduces the up gain of self automatically, be exaggerated the purpose that returns to the base station to reach the inhibition upstream noise, reduced lifting, improved the sensitivity of base station making an uproar at the bottom of the base station.
Because in the course of work of reality, the power P of statistics also may be considered the situation of P greater than P0 greater than the threshold value P0 that sets in advance, and describes in conjunction with Fig. 2, comprises step;
201, power difference threshold value is set;
Power difference threshold value P0 is set.
202, carry out channel separation;
Receive upward signal, upward signal is carried out obtaining carrier signal after the channel separation.
203, difference power primary system meter;
The power difference P of statistics carrier signal in second time interval T4 that sets.
204, judge whether power difference threshold value is bigger than the power difference of statistics;
Judge whether power difference threshold value P0 is bigger than the power difference P of statistics, and greater than P, then execution in step 205 as if P0; If P0 is less than P, then execution in step 206.
205, reduce up gain;
Reducing up gain makes an uproar to reduce the end.
206, open up link;
207, postpone a period of time.
Return execution in step 203 after the time of one section setting of delay.
As improvement, before step 207, can also comprise the steps: Fig. 2
P is during greater than P0, open up link after, elapsed time T1 again, if the amplitude of variation of P is less than P2, P2 is predefined variable power pre-value, then closes up link and the up gain reduction G2 of WCDMA radio frequency stretch system;
Continue the statistics carrier signal, if P greater than P0, then reopens up link.
This improvement, further perfect function of the present invention, for example, system statistics mobile phone ascending power is if power change values is within a certain period of time then thought and the mobile phone on-hook reduced up gain less than P2; Continue to detect if the mobile phone ascending power, thinks then that current phone still using, opens up link and use for mobile phone still greater than the power threshold P0 that sets.
In practice, power statistic and power ratio more not necessarily will all carried out all the time, if constantly all adding up and comparing, and the one, increased power dissipation has improved operation cost, and the 2nd, accelerate the aging of hardware.Can do following improvement to the foregoing description for these reasons:
The time interval T0 of power statistic is set, and the power statistic time arrives, and just adds up the step of carrier signal; Power ratio time interval T2 is set, and power ratio arrived than the time, just carried out the comparison of P and P0.
Wherein, T1 is more than or equal to T2; 0≤G2≤Gu, Gu are the maximum up gain of WCDMA radio frequency stretch system.
Because the present invention has the function that suppresses upstream noise, so in actual applications, the cascade of a plurality of WRRU system is made an uproar at the bottom of using and can not improving the base station rapidly, and Fig. 3 is the structural representation of a plurality of WRRU system cascade in the practical application,
Node B is connected with near-end machine S1, can be according to actual needs moves the zone that needs to cover signal to by optical fiber etc. as for remote termination, can draw a remote termination S2 as shown in the figure, also can draw a plurality of remote termination S3......Sn.
The present invention has improved the sensitivity of base station owing to adopted the upstream noise inhibition, makes the WCDMA radio frequency stretch system can realize big as far as possible expand the coverage area and reducing the lifting of being made an uproar in the end of base station.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (4)
1. a WCDMA radio frequency stretch system gain control method is characterized in that, comprises step:
Power difference threshold value P0 is set;
Receive upward signal, described upward signal is carried out obtaining carrier signal after the channel separation;
Add up the power difference P of described carrier signal in second time interval T4 that sets;
Described P and described P0 are compared, and less than described P0, then the up gain with the WCMDA radio frequency stretch system reduces G2 as if described P, and wherein, described G2 is the variation pre-value of predefined up gain.
2. WCDMA radio frequency stretch system gain control method according to claim 1 is characterized in that,
If described P greater than described P0, then opens up link;
Through very first time interval T 1, if the amplitude of variation of described P is less than P2, wherein, described P2 is predefined variable power pre-value, then closes described up link and the up gain reduction G2 of described WCDMA radio frequency stretch system;
Continue the described carrier signal of statistics, if described P greater than described P0, then reopens described up link.
3. WCDMA radio frequency stretch system gain control method according to claim 1 is characterized in that,
The time interval T0 of power statistic is set, and the power statistic time arrives, and just carries out the step of described statistics carrier signal; Power ratio time interval T2 is set, and power ratio arrived than the time, just carried out the comparison of described P and described P0.
4. according to each described WCDMA radio frequency stretch system gain control method of claim 1 to 3, it is characterized in that,
Described T1 is more than or equal to described T2;
0≤G2≤Gu, described Gu are the maximum up gain of described WCDMA radio frequency stretch system.
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| CN201110098742.9A CN102170690B (en) | 2011-04-20 | 2011-04-20 | A gain control method of a WCDMA radio remote unit |
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| CN201110098742.9A CN102170690B (en) | 2011-04-20 | 2011-04-20 | A gain control method of a WCDMA radio remote unit |
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| CN102170690B CN102170690B (en) | 2014-08-20 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103209148A (en) * | 2013-03-28 | 2013-07-17 | 京信通信系统（中国）有限公司 | Cascading background noise suppression device, system and method of uplink |
| CN103874182A (en) * | 2012-12-14 | 2014-06-18 | 京信通信系统（中国）有限公司 | Noise floor suppression method and device for remote coverage system |
| WO2015100596A1 (en) * | 2013-12-31 | 2015-07-09 | 华为技术有限公司 | Method, device and system for suppressing uplink background noise in indoor distributed system |
| US10085223B1 (en) | 2017-01-13 | 2018-09-25 | Sprint Communications Company L.P. | Wireless repeater system to modify an automatic gain control timer |
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| CN101938306A (en) * | 2009-09-29 | 2011-01-05 | 厦门大学 | Inhibition method of uplink base noise of GSM (Global System for Mobile Communication) digital optical fiber repeater station |
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| CN101013914A (en) * | 2007-02-15 | 2007-08-08 | 中兴通讯股份有限公司 | Automatic gain control method and device for WCDMA mobile terminal |
| CN101257350A (en) * | 2008-04-03 | 2008-09-03 | 京信通信系统（中国）有限公司 | Optical fiber straight amplification station based on opened loop and closed loop auto-gain control chain circuit |
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| CN103874182A (en) * | 2012-12-14 | 2014-06-18 | 京信通信系统（中国）有限公司 | Noise floor suppression method and device for remote coverage system |
| CN103874182B (en) * | 2012-12-14 | 2017-05-10 | 京信通信系统（中国）有限公司 | Noise floor suppression method and device for remote coverage system |
| CN103209148A (en) * | 2013-03-28 | 2013-07-17 | 京信通信系统（中国）有限公司 | Cascading background noise suppression device, system and method of uplink |
| WO2015100596A1 (en) * | 2013-12-31 | 2015-07-09 | 华为技术有限公司 | Method, device and system for suppressing uplink background noise in indoor distributed system |
| CN105122902A (en) * | 2013-12-31 | 2015-12-02 | 华为技术有限公司 | Method, device and system for suppressing uplink background noise in indoor distributed system |
| CN105122902B (en) * | 2013-12-31 | 2019-05-03 | 华为技术有限公司 | The method, apparatus and system for inhibiting uplink bottom to make an uproar in compartment system indoors |
| US10085223B1 (en) | 2017-01-13 | 2018-09-25 | Sprint Communications Company L.P. | Wireless repeater system to modify an automatic gain control timer |
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| CN102170690B (en) | 2014-08-20 |
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Owner name: TIANJIN JINGXIN COMMUNICATION SYSTEM CO., LTD. Free format text: FORMER OWNER: COMBA TELECOM SYSTEMS (CHINA) CO., LTD. Effective date: 20150817 |
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Effective date of registration: 20150817 Address after: 300193, agricultural building 606 (Science and Technology Park), 26 Aerospace Road, Tianjin, Nankai District Patentee after: TIANJIN COMBA TELECOM SYSTEMS CO., LTD. Address before: 510663 Guangzhou Science City, Guangdong Shenzhou Road, No. 10 Patentee before: Comba Telecom System (China) Co., Ltd. |