CN100349485C - Method of base station uplink receiving channel correction - Google Patents
Method of base station uplink receiving channel correction Download PDFInfo
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- CN100349485C CN100349485C CNB2004100717472A CN200410071747A CN100349485C CN 100349485 C CN100349485 C CN 100349485C CN B2004100717472 A CNB2004100717472 A CN B2004100717472A CN 200410071747 A CN200410071747 A CN 200410071747A CN 100349485 C CN100349485 C CN 100349485C
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- receiving channel
- base station
- uplink receiving
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- gain
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Abstract
The present invention discloses a method for correcting an uplink receiving channel of a base station, which relates to the field of communication. The gain of the whole receiving channel of the base station comprising an antenna feed system can be measured and corrected under the condition that manual operation is unnecessary and special equipment is not used. The method for correcting the uplink receiving channel of the base station adopts an RTWP detecting unit inside the base station instead of a special power meter to measure the noise output power of the uplink receiving channel, and achieves full automatic measurement and correction; the antenna feed system serves as the load of a radio frequency input end instead of using a matched load or opening the circuit of the radio frequency input end, so that the gain of the uplink receiving channel of the base station comprising the antenna feed system can be corrected together.
Description
Technical field
The present invention relates to the communications field, particularly the settling mode that the base station uplink receiving channel change in gain is exerted an influence at antenna-feedback system.
Background technology
Wideband Code Division Multiple Access (WCDMA) (Wide Code Division Multiple Access is called for short " WCDMA ") is one of at present global three kinds of main 3G (Third Generation) Moblie systems, is the development trend of future mobile communications.The WCDMA system is international mobile communication (International Mobile Telecommunications, abbreviation " IMT ") a member of-2000 families, it is by core net (Core Network, abbreviation " CN "), universal mobile telecommunications system land radio access web (Universal Mobile TelecommunicationSystem Terrestrial Radio Access Network, be called for short " UTRAN ") and user's set (UserEquipment is called for short " UE ") composition.UTRAN and UE adopt the WCDMA wireless access technology.The WCDMA network is followed following principle: UTRAN and is separated with the CN function as far as possible when design.Promptly the management function of Radio Resource is concentrated on UTRAN and finish, and carry out at CN with professional and application related functions.UTRAN is bridge and the tie that connects mobile subscriber and CN.
Base station uplink receiving channel is the important component part of UTRAN, and it is made up of antenna-feedback system and base station two parts.
Antenna-feedback system is meant from antenna to the equipment the base station radio-frequency input.As shown in Figure 1, typical WCDMA antenna-feedback system 10 is made up of the wire jumper 17 of the input that the antenna 11, wire jumper 12, the tower that connect successively put 13, wire jumper 14, feeder line 15 and lightning arrester 16 and being used to is connected to base station 20.
20 inside, base station then comprise attenuator 21, the uplink receiving channel 22 that connects successively and receive total bandwidth power (Received Total Wideband Power is called for short " RTWP ") detecting unit 23.Wherein, attenuator 21 is connected with above-mentioned wire jumper 17.
RTWP refers to the antenna opening signal bandwidth internal power that base station data feedback channel 22 receives, measure R TWP value is responsible for and to the radio network controller of being responsible for control and management UTRAN network and wireless channel (Radio Network Controller is called for short " RNC ") report in the base station.As everyone knows, because tower is put with the inside of base station data feedback channel amplification is arranged to received signal, wire jumper, feeder and attenuator etc. have attenuation to received signal, so be not difficult to find the RTWP value except the intensity that depends on received signal itself, be subjected to also that antenna, wire jumper, tower are put, the influence of feeder line, lightning arrester, attenuator and inside of base station upstream channel gain from the base station uplink receiving channel structure chart.
On the other hand, after the base station design of any WCDMA was come out, the RTWP value of uplink receiving channel did not have definite requirement when its design objective connect load to system in certain error range.Proofread and correct the RTWP value compliance with system index request when making its zero load so need that after the base station system design and installation finishes it is carried out whole base station uplink receiving channel gain.Accomplish whole uplink receiving channel is accurately proofreaied and correct, must proofread and correct antenna-feedback system gain and inside of base station gain simultaneously.For antenna-feedback system, though can pass through engineering parameter (wire jumper for example, the length of feeder) roughly calculate the pad value of wire jumper and feeder line, but accuracy can not be guaranteed, and the gain that tower is put also has certain discreteness, and the gain of whole like this antenna feeder part is difficult to determine, if use instrument to measure, because the quantity of base station is a lot, workload is very huge.On the other hand, for the base station, the gain of its inner uplink receiving channel should be a definite value satisfying under the situation of design specification.But because the discreteness of device, the gain of each road uplink receiving channel of base station is compared with the gain of design code certain deviation, need artificial or by software from dynamic(al) correction.
The existing a solution of problem is exactly at base station radio-frequency input open circuit or connects under the situation of matched load hereto, regulates the uplink receiving channel gain, makes the channel gain of itself and system requirements enough approaching.
In actual applications, there is following problem in such scheme: all need to adopt the artificial scene of special test equipment to measure and proofread and correct for each uplink receiving channel, and only can proofread and correct the uplink receiving channel gain of inside of base station, workload is big, efficient is low, the maintenance cost height.
Cause the main cause of this situation to be, prior art adopts special equipment to carry out power measurement, thereby has caused necessary manual operation; Adopt rf inputs open circuit or matched load mode to measure, caused and to have proofreaied and correct the radio-frequency channel gain of inside of base station, can not proofread and correct the whole receive path that comprises antenna-feedback system.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of base station uplink receiving channel correction, makes it possible to need not manual operation, do not using under the situation of special equipment the gain of the whole base station receive path that comprises antenna-feedback system is measured and proofreaied and correct.
For achieving the above object, the invention provides a kind of method of base station uplink receiving channel correction, wherein, with comprise tower in the antenna-feedback system that described base station system is connected and put, comprise attenuator, total received power in broadband measuring appliance in the described base station system, and described uplink receiving channel, and comprise the Gain Adjustable device in the described uplink receiving channel, described method comprises following steps:
When not having interference signal in the employed frequency band of described uplink receiving channel,
A closes described tower to be put, and the value of described attenuator is set to zero;
B is adjusted into first value by described Gain Adjustable device with the total received power in broadband value of described inside of base station uplink receiving channel, and the error between the total received power in broadband value of described first value and specification appointment is in the scope of presetting;
C opens described tower to be put, and obtains second value of described total received power in broadband by described total received power in broadband measuring appliance;
The value of the described attenuator of D is set to the poor of second value of described total received power in broadband and first value.
Described Gain Adjustable device is voltage controlled gain amplifier or voltage controlled attenuator.
Among the described step B, described default error range is 0.5DBM.
In the described method, by remote mode realize to described tower put close and open, to the adjustment of described attenuator, described total received power in broadband measuring appliance is obtained the control of measured value and to the adjustment of described Gain Adjustable device.
The present invention also provides a kind of method of base station uplink receiving channel correction, wherein, comprise attenuator, total received power in broadband measuring appliance in the described base station system, and described uplink receiving channel, and comprise the Gain Adjustable device in the described uplink receiving channel, described method comprises following steps:
When not having interference signal in the employed frequency band of described uplink receiving channel,
The value of the described attenuator of E is set to zero;
F is adjusted into the total received power in broadband value of described inside of base station uplink receiving channel by described Gain Adjustable device the value of design specification appointment.
Wherein, in the described method, by remote mode realize to described attenuator adjustment, described total received power in broadband measuring appliance is obtained the control of measured value and to the adjustment of described Gain Adjustable device.
Described Gain Adjustable device is voltage controlled gain amplifier or voltage controlled attenuator.
By relatively finding, technical scheme difference with the prior art of the present invention is, adopt the RTWP detecting unit of inside of base station rather than special power meter that the noise power output of uplink receiving channel is measured, accomplished all automatic measurement and correction; With antenna-feedback system as the load of rf inputs rather than use matched load or, can proofread and correct in the lump to the base station uplink receiving channel gain that comprises antenna-feedback system with the rf inputs open circuit.
Difference on this technical scheme has brought comparatively significantly beneficial effect, promptly adopts Long-distance Control to carry out full automatic gain measurement and correction, has improved operating efficiency; Do not rely on special-purpose testing equipment, reduced maintenance cost; And can measure and proofread and correct the gain of the whole base station data feedback channel that comprises base station and antenna-feedback system.
Description of drawings
Fig. 1 is the base station uplink receiving channel structural representation;
Fig. 2 is the uplink receiving channel gain calibration scheme schematic diagram according to an embodiment of prior art;
Fig. 3 is the automatic bearing calibration flow chart of elimination base station uplink receiving channel change in gain according to an embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
In base station uplink receiving channel structural representation shown in Figure 1, in the whole uplink receiving channel 22 except tower put 13 and the radiofrequency signal of 22 pairs of receptions of uplink receiving channel have the amplification, other each parts all have attenuation.Therefore, the RTWP value that measures of RTWP detecting unit for the signal strength signal intensity of antenna opening after the amplification of the decay of each attenuation part and each amplifier unit, comprehensively obtain through result amplified.This value must deduct the signal strength signal intensity that just can obtain antenna opening after total multiplication factor, reports to RNC.
In antenna-feedback system 10, because the pad value of each wire jumper, feeder line can not calculate exactly, and the gain that tower is put also has certain discreteness, makes the gain of whole antenna-feedback system part be difficult to determine.In order to guarantee to satisfy the base station design requirement, need be between the A point of base station inlet and B point attenuator of increase offset the gain of antenna-feedback system, this just need obtain the exact value of the gain of antenna-feedback system.As previously mentioned, prior art need be measured to the base station with instrument one by one to the gain of antenna-feedback system 10, and to the gain of base station 20 inner uplink receiving channels need artificial or by software from dynamic(al) correction.
In order to make purpose of the present invention and principle easier to understand, below in conjunction with Fig. 2, make a concrete analysis of uplink receiving channel gain calibration scheme in the prior art, and compare with scheme that the present invention proposes.
In scheme shown in Figure 2, according in actual use, the noise factor of uplink receiving channel is relatively stablized this phenomenon, the gain that utilizes uplink receiving channel noise power output can calculate uplink receiving channel.As shown in Figure 2, power meter 30 is connected on the output of uplink receiving channel 22, measures the noise power of output.The rf inputs state is an open circuit or connecing matched load can be divided into metering system open circuit and coupling dual mode when measuring output noise power.Calculating channel gain Gain1 with the open circuit mode after the noise power output with power instrumentation amount uplink receiving channel under the open circuit mode.Calculate channel gain Gain1 with matching way after the noise power output with power instrumentation amount uplink receiving channel under matching way.After in two ways any calculates channel gain Gain1, it is compared with the channel gain Gain of system requirements, and regulate the uplink receiving channel gain, make that at last the difference of Gain1 and Gain is enough little, think promptly to meet the demands that the channel gain adjustment finishes.As mentioned above, this scheme must manually use power meter to measure, and can only adjust the gain of the uplink receiving channel 22 in the base station 20, can not adjust the whole receive path that comprises antenna-feedback system.For addressing these problems, the present invention proposes following scheme.
Below in conjunction with Fig. 3, describe in detail according to principle of the present invention, eliminate the automatic bearing calibration of base station uplink receiving channel change in gain.
At first, the yield value of the uplink receiving channel 22 of correction 20 inside, base station makes it to reach design specification (for example being G).Before proofreading and correct, to guarantee that this uplink receiving channel does not have the user to use, and does not have interference signal in the employed frequency band.Need to prove,, need carry out noise test if build a station.After having guaranteed above-mentioned condition, referring to Fig. 3, the present invention comprises following steps:
In step 101, close tower and put 13.This is to cause influence to the gain calibration of uplink receiving channel 22 for the gain that prevents antenna-feedback system.At this moment, whole antenna-feedback system equivalence is a matched load.Need to prove, in the present invention, close and open tower and put operation and can realize, do not need execute-in-place by remote control operation.
Then enter step 102, the value of attenuator 21 is made as 0.Owing to do not have the antenna-feedback system gain this moment, do not need the gain of antenna-feedback system is offset.
After this enter step 103, regulate the yield value of base station 22 inner uplink receiving channels 22, the RTWP value that RTWP detecting unit 23 is recorded is the value (being assumed to Xdbm) of design specification appointment.Need to prove, 20 inside, base station are in order to support gain calibration, design has the Gain Adjustable device, in according to one embodiment of present invention, it during this Gain Adjustable the voltage controlled gain amplifier, but those of ordinary skill in the art can know, other device also can realize, for example voltage controlled attenuator etc.Along with the adjustment of uplink receiving channel gain, the RTWP value that records is more and more near the value of design specification appointment.When both absolute value of difference during, think to reach requirement that the gain adjustment of base station 20 inner uplink receiving channels finishes less than a certain thresholding (for example 0.5dbm).What deserves to be mentioned is, measure the noise power output of uplink receiving channel owing to adopted the RTWP detecting unit of base station self in the present invention, do not need manually to adopt special power meter to carry out power measurement, thereby avoided manual operation, realize full automatic measurement and correction, and need not special instrument and equipment.
Then enter step 104, begin the whole receive path that comprises antenna-feedback system is adjusted.Be in course of adjustment, at first open tower and put, note the RTWP value that record this moment, be assumed to Ydbm.
After this enter step 105, calculate the pad value of attenuator 21, and attenuator 21 is set in view of the above according to (Y-X) dbm.So far, the whole uplink receiving channel gain calibration that comprises antenna-feedback system 10 finishes.
Need to prove that top step is just proofreaied and correct the gain of a uplink receiving channel.Two of sub-district uses even the more receive path of general WCDMA carry out diversity reception.At this moment, need carry out the operation of above-mentioned steps 101～105 to each receive path.In addition, when antenna-feedback system does not use tower to put, only need step 102 and 103 two steps can finish the correction of uplink receiving channel.
In above-mentioned two technical schemes, the former adopts special power meter that the noise power output of uplink receiving channel is measured, and needs in-site measurement; The latter has adopted the RTWP detecting unit of inside of base station, can carry out remote measurement and correction; The former uses matched load or rf inputs is opened a way; The latter is the load of antenna-feedback system as rf inputs, thereby the base station uplink receiving channel gain that comprises antenna-feedback system is proofreaied and correct in the lump.Obviously, the present invention has not only improved operating efficiency, has reduced maintenance cost, and can measure and proofread and correct the gain of the whole base station data feedback channel that comprises base station and antenna-feedback system.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (7)
1. method of base station uplink receiving channel correction, wherein, with comprise tower in the antenna-feedback system that described base station system is connected and put, comprise attenuator, total received power in broadband measuring appliance in the described base station system, and described uplink receiving channel, and comprise the Gain Adjustable device in the described uplink receiving channel, it is characterized in that, described method comprises following steps:
When not having interference signal in the employed frequency band of described uplink receiving channel,
A closes described tower to be put, and the value of described attenuator is set to zero;
B is adjusted into first value by described Gain Adjustable device with the total received power in broadband value of described inside of base station uplink receiving channel, and the error between the total received power in broadband value of described first value and specification appointment is in the scope of presetting;
C opens described tower to be put, and obtains second value of described total received power in broadband by described total received power in broadband measuring appliance;
The value of the described attenuator of D is set to the poor of second value of described total received power in broadband and first value.
2. method of base station uplink receiving channel correction according to claim 1 is characterized in that, described Gain Adjustable device is voltage controlled gain amplifier or voltage controlled attenuator.
3. method of base station uplink receiving channel correction according to claim 1 is characterized in that, among the described step B, described default error range is 0.5DBM.
4. method of base station uplink receiving channel correction according to claim 1, it is characterized in that, in the described method, by remote mode realize to described tower put close and open, to the adjustment of described attenuator, described total received power in broadband measuring appliance is obtained the control of measured value and to the adjustment of described Gain Adjustable device.
5. a method of base station uplink receiving channel correction wherein, comprises attenuator, total received power in broadband measuring appliance in the described base station system, and described uplink receiving channel, and comprise the Gain Adjustable device in the described uplink receiving channel, it is characterized in that, described method comprises following steps:
When not having interference signal in the employed frequency band of described uplink receiving channel,
The value of the described attenuator of E is set to zero;
F is adjusted into the total received power in broadband value of described inside of base station uplink receiving channel by described Gain Adjustable device the value of design specification appointment.
6. method of base station uplink receiving channel correction according to claim 5, it is characterized in that, in the described method, by remote mode realize to described attenuator adjustment, described total received power in broadband measuring appliance is obtained the control of measured value and to the adjustment of described Gain Adjustable device.
7. method of base station uplink receiving channel correction according to claim 5 is characterized in that, described Gain Adjustable device is voltage controlled gain amplifier or voltage controlled attenuator.
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| CNB2004100717472A CN100349485C (en) | 2004-07-13 | 2004-07-13 | Method of base station uplink receiving channel correction |
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| CNB2004100717472A CN100349485C (en) | 2004-07-13 | 2004-07-13 | Method of base station uplink receiving channel correction |
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| CN1722873A CN1722873A (en) | 2006-01-18 |
| CN100349485C true CN100349485C (en) | 2007-11-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100466848C (en) * | 2006-09-15 | 2009-03-04 | 华为技术有限公司 | Up channel analytical method, up channel abnormal analytical method and system |
| CN101442760B (en) * | 2006-09-15 | 2010-07-07 | 华为技术有限公司 | Analysis method and system for upstream channel abnormity |
| CN103369586B (en) * | 2012-03-28 | 2018-04-20 | 中兴通讯股份有限公司 | A kind of method and device for handling the interference of base station uplink outer |
| CN102820937A (en) * | 2012-07-25 | 2012-12-12 | 华为技术有限公司 | Measuring method of received signal strength indicator (RSSI), measuring device of RSSI and receiver |
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| CN1399492A (en) * | 2001-07-25 | 2003-02-26 | 日本电气株式会社 | Receiver monitoring system and method for radio base station system |
| CN1418028A (en) * | 2001-11-06 | 2003-05-14 | 深圳市中兴通讯股份有限公司上海第二研究所 | Correction method and device of intelligent antenna subsystem |
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2004
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1225227A (en) * | 1996-07-05 | 1999-08-04 | 艾利森电话股份有限公司 | Process and device for quality determination in a radio communication system |
| EP1016299A1 (en) * | 1997-02-13 | 2000-07-05 | Qualcomm Incorporated | A power control subsystem |
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| US20020160718A1 (en) * | 2001-04-05 | 2002-10-31 | Eli Yona | Method and apparatus for performing on-going gain calibrating in a communication system |
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