CN107070557A - It is a kind of to be used to shorten the method with PN RRU time delays - Google Patents
It is a kind of to be used to shorten the method with PN RRU time delays Download PDFInfo
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- CN107070557A CN107070557A CN201611090623.8A CN201611090623A CN107070557A CN 107070557 A CN107070557 A CN 107070557A CN 201611090623 A CN201611090623 A CN 201611090623A CN 107070557 A CN107070557 A CN 107070557A
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- rru
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- optical cable
- fiber optic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
Abstract
It is used to shorten the method with PN RRU time delays the invention discloses a kind of, including：Cable length most short RRU is found out respectivelySWith cable length most long RRUL；Calculate most long RRULCable length L, according to routing iinformation data, select cable length closest to L/2 fiber cable cross connection box as roundabout point, it is preferred by RRUSRoundabout point is connected to by optical cable, then BBU is connected to by optical cable by roundabout point, new optical cable path is formed so that RRUSCable length close to RRUL；Repeat the above steps so that final all RRU cable lengths all with RRULCable length is approached.The present invention proposes a kind of method for being used for shortening with PN RRU time delays, it can shorten delay inequality by way of elongating short optical cable under the scene of long optical cable can not be shortened, so as to preferably play the technique effect with PN RRU, the later delay problem of multiple RRU cell combinings can be thoroughly solved.
Description
Technical field
The invention belongs to field, and in particular to a kind of to be used to shorten the method with PN-RRU time delays.
Background technology
With the development of wireless communication technology, the product of communication equipment producer is gradually minimized, and zooms out RRU a lot
Place is very popularized, and the density of base station is very close, and it is very serious that the interference between signal just shows, particularly
Interference between cdma network, signal can cause network quality to be decreased obviously, and serious influences whether call drop so that user's makes
It is poor with perceiving, therefore many regions have used the RRU that equipment manufacturer provides with PN technologies in the situation that capacity allows, and utilize
Multiple cell combinings into 1 cell method so that the interference between device interior reduces signal.This technology is in existing network
In be widely used, the interference problem of high-rise cell, the interference problem of lake surface, interference problem of signal etc. in high ferro.
But the same PN technologies that equipment manufacturer is provided, there is a defect, i.e., when multiple RRU are carried out with PN networkings,
Equipment can only compensate most short RRU optical-fiber time-delay, can not be compensated for remaining optical-fiber time-delay.By taking Fig. 1 as an example,
RRU1, RRU2, RRU3 common networking can only compensate RRU1 optical cable L1 time delay into a PN, now equipment, for RRU2's
Time delay can not then carry out whole compensation, and its time delay is L2-L1, and RRU3 time delay can not carry out whole compensation, and its time delay is L3-
L1, if also having others RRU, then its time delay is Ln-L1.
Although the same PN technologies of equipment manufacturer solve the interference problem between signal, one can be brought new to ask
Topic --- delay problem.If RRU2 and RRU3 optical cable time delay is very long, then RRU2 time delay（L2-L1 sections of generations of optical cable
Time delay）With RRU3 time delay（The time delay of L3-L1 sections of generations of optical cable）Will be very big, it can not compensate these interference with PN technologies and ask
Topic.Time delay is long, influences whether the signal search speed of mobile phone, particularly under the high scene of this speed of high ferro, signal
Search be easy to cause not in time to go offline.
The method of traditional solution time delay is mainly the cable length for shortening the longer RRU of optical cable, such as Fig. 2（a）It is shown, mainly
The method used is exactly that, without jumper connection, by the way of direct routing is connected, this mode is can to solve the light of a part
Cable time delay, but actual conditions, which are many scenes, can not use direct-connected route, because optical cable laying needs pole line or pipeline, very
Many scenes are without ready-made pole line and pipeline, if using newly-built pole line and pipeline, this cost consumption is very
High, what normal condition can be subject to.
Therefore the method that cost is relatively low and can quickly solve same PN-RRU delay problems is only found, could be by this skill
Art preferably being applied in existing network just, otherwise can not use same PN skills under many scenes because of time delay limited
Art.
Disclosed in Patent No. CN200710087524.9 Chinese patent document：The inspection disturbed in cdma system with PN
Method and apparatus are surveyed, this patent is mainly the detection means disturbed in a kind of code division multiple access system with PN, can accurately differentiate PN
Interference problem, this patented invention are primarily to find with PN interference, but whether solve caused by multiplex distance is excessively near
Interference.Disclosed in Patent No. CN201410683351.7 Chinese patent document：The downlink optical fiber time delay of LTE cell combinings
Compensation method and device, this patent are mainly the data storage after baseband processing unit BBU maps downlink resource and deposited at random
In access to memory RAM；Within a sampling period, each radio frequency remote unit RRU being connected with BBU optical fiber is according to being pre-configured with
Respective optical-fiber time-delay respective data are read from RAM, by eating dishes without rice or wine to send after RRU handling processes, this patent is mainly
The delay problem brought after LTE cell combinings is handled in equipment side, this patent is mainly or carrying out most short time-delay compensates, but
The compensation of most short time-delay is the delay problem that can not solve just to come after multiple RRU cell combinings.
The content of the invention
In view of the above-mentioned problems, the present invention proposes a kind of method for being used for shortening with PN-RRU time delays, long light can not shortened
Delay inequality can be shortened by way of elongating optical cable under the scene of cable, so as to preferably play the technology with PN-RRU
Effect, can thoroughly solve the later delay problem of multiple RRU cell combinings.
Above-mentioned technical purpose is realized, above-mentioned technique effect is reached, the present invention is achieved through the following technical solutions：
It is a kind of to be used to shorten the method with PN-RRU time delays, comprise the following steps：
Step 1: inside measurement BBU all same PN RRU cable length, cable length most short RRU is found out respectivelySAnd light
Cable length most long RRUL；
Step 2: searching the Optical Cable information material of existing network, most long RRUL cable length L is calculated, according to routing iinformation
Data, selects cable length closest to L/2 fiber cable cross connection box as roundabout point, preferred by RRUSIt is connected to by optical cable circuitous
Hui Dian, then BBU is connected to by optical cable by roundabout point, form RRUSNew optical cable path so that RRUSCable length approach
RRULCable length；
Step 3: repeat step one and step 2, are less than RRU by each cable lengthLRRU optical cable path carry out it is roundabout draw
It is long so that final all RRU cable lengths all with RRULCable length is approached.
Further, cable length most short RRU is found out in the step 2SWith cable length most long RRULSpecially：
Directly inquiry is obtained on the webmaster of equipment manufacturer.
Further, by RRU in the step 2SRoundabout point is connected to by optical cable, then connected by roundabout point by optical cable
BBU is connected to, is specially：Respectively in RRUSChange it in the residing corresponding ODF in base station and the corresponding ODF in base station residing for roundabout point
Wiring, with reference to original lightguide cable link between each base station, sets up RRUSBetween base station residing for residing base station and roundabout point
Optical cable path, while setting up the optical cable path between base station and BBU residing for roundabout point, forms RRUSIt is new between BBU to return
Road.
Further, the RRUSThe corresponding ODF in residing base station includes the first fiber optic cable interface, the second fiber optic cable interface, the
One fiber optic cable interface is used to connect BBU, and the second fiber optic cable interface is used to connect RRUS；The corresponding ODF in base station residing for the roundabout point
Including the 3rd fiber optic cable interface, the 4th fiber optic cable interface；Optical cable, second are provided between first fiber optic cable interface and the 4th fiber optic cable interface
Optical cable is provided between fiber optic cable interface and the 3rd fiber optic cable interface；3rd fiber optic cable interface and the 4th fiber optic cable interface are connected by wire jumper
Connect.
As a further improvement on the present invention, it is described.
Beneficial effects of the present invention：
1st, the present invention uses reverse thinking, by roundabout short optical cable make its length close to long optical cable length and then reduction when
Prolong, and traditional method is that the purpose for reducing time delay is reached by way of shortening long optical cable.
2nd, the present invention uses all Optical Cables for the existing network that reuses, and has given full play to the optimization of transfer resource, resource
Maximizing the benefits, does not almost increase extra cost, and to need newly-built pole line or pipeline to realize direct-connected for traditional method
Route, some scenes even at all can not newly-built pole line and pipeline, enforcement difficulty is very big, though may be embodied to this nor
Chang Anggui.
3rd, the present invention can cause short optical cable to reach the length as long optical cable after roundabout, and then thoroughly solve
The delay problem that optical cable difference band comes, and conventional method is even with direct-connected route, remaining unchanged, it is poor to have an Optical Cable, time delay
The problem of be difficult to basic elimination.
Brief description of the drawings
Fig. 1 is BBU and RRU networking mode schematic diagram；
Fig. 2（a）And Fig. 2（b）Respectively traditional approach and the present invention solve the schematic diagram with PN delay problems；
Fig. 3 is the blue or green Liu family's Optical Cable situation schematic diagram in the Middle East of embodiment one；
Fig. 4 east green grass or young crops Liu family TRM0 and Zheng Lu Fan Jia village RRU6 and RRU7 cable length Query Result display figure；
Fig. 5 zooms out RRU test time delay schematic diagram for each；
Fig. 6 and Fig. 7 are the time delay that tripartite confrontation equipment CDMA Finger and Agilent sweep generator are tested respectively；
Fig. 8 is high ferro test data comparison diagram before and after the method using the present invention；
Fig. 9 is the optical cable jumper connection schematic diagram between all pool bridges in eastern green grass or young crops Liu Jia rivers.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The application principle of the present invention is explained in detail below in conjunction with the accompanying drawings.
It is a kind of to be used to shorten the method with PN-RRU time delays, comprise the following steps：
Step 1: inside measurement BBU all same PN RRU cable length, cable length most short RRU is found out respectivelySAnd light
Cable length most long RRUL；
Step 2: searching the Optical Cable information material of existing network, most long RRUL cable length L is calculated, according to routing iinformation
Data, selects cable length closest to L/2 fiber cable cross connection box as roundabout point, preferred by RRUSIt is connected to by optical cable circuitous
Hui Dian, then BBU is connected to by optical cable by roundabout point, form RRUSNew optical cable path so that RRUSCable length approach
RRULCable length；
Step 3: repeat step one and step 2, are less than RRU by each cable lengthLRRU optical cable path carry out it is roundabout draw
It is long so that final all RRU cable lengths all with RRULCable length is approached.
Fig. 2（b）It is schematic diagram of the present invention solution with PN delay problems.
Further, cable length most short RRU is found out in the step 2SWith cable length most long RRULSpecially：
Directly inquiry is obtained on the webmaster of equipment manufacturer.
Further, by RRU in the step 2SRoundabout point is connected to by optical cable, then connected by roundabout point by optical cable
BBU is connected to, is specially：Respectively in RRUSChange it in the residing corresponding ODF in base station and the corresponding ODF in base station residing for roundabout point
Wiring, with reference to original lightguide cable link between each base station, sets up RRUSBetween base station residing for residing base station and roundabout point
Optical cable path, while setting up the optical cable path between base station and BBU residing for roundabout point, forms RRUSIt is new between BBU to return
Road.
Further, the RRUSThe corresponding ODF in residing base station includes the first fiber optic cable interface, the second fiber optic cable interface, the
One fiber optic cable interface is used to connect BBU, and the second fiber optic cable interface is used to connect RRUS；The corresponding ODF in base station residing for the roundabout point
Including the 3rd fiber optic cable interface, the 4th fiber optic cable interface；Optical cable, second are provided between first fiber optic cable interface and the 4th fiber optic cable interface
Optical cable is provided between fiber optic cable interface and the 3rd fiber optic cable interface；3rd fiber optic cable interface and the 4th fiber optic cable interface are connected by wire jumper
Connect.Wherein, the optical cable between the first fiber optic cable interface and the 4th fiber optic cable interface is existing optical cable, the second fiber optic cable interface and the 3rd light
Optical cable between cable interface is existing optical cable.
Embodiment one
In the present embodiment, Huawei's RRU device is used, therefore it is long by dsp cbtsfblen order inquiries to obtain optical cable
The most short RRU of degreeSMost long RRUL。
As shown in figure 3, by taking the blue or green Liu family in high ferro website east as an example, the RRU6 and RRU7 in eastern green grass or young crops Liu family TRM0 and Zheng Lu Fan Jia village
The cable length in the same PN done, Zheng Lu the Fan Jia village is long, there is 5KM or so, and in this case, Huawei's equipment can only be compensated
The time delay of TRM0 to UBRI plates, Zheng Lu Fan Jia village 5KM optical cable time delay can not then be compensated so that the large stretch of base in eastern green grass or young crops Liu Jia peripheries
Search window of standing sets very big, have impact on the search speed of mobile phone.
Using the method for the present invention, east green grass or young crops Liu family TRM0 is travelled back across into all pool abutment stations with one section of optical cable, is then connected to again
On eastern green grass or young crops Liu family UBRI plates, the unidirectional length of optical cable between east green grass or young crops Liu Jia and all pools bridge is in 2.5KM or so（Two-way back and forth=5KM）,
So TRM0 optical cable time delay has also reached 2.5*2=5KM, and the script Zheng Lu Fan Jia village RRU cable lengths quite, thorough hair
Equipment most short time-delay compensation function is waved, delay problem caused by optical cable difference, therefore the search of the blue or green Liu family's peripheral base station in east is eliminated
When window just could be arranged to normal, and then the search speed of mobile phone can be improved.
After being treated using the method for the present invention, eastern green grass or young crops Liu family TRM0 and Zheng Lu Fan Jia village RRU6 and RRU7 cable length
Inquiry is respectively 5322m, 5796m, 5879m on webmaster.As shown in Figure 4.
We are tested with tripartite confrontation and Agilent sweep generator simultaneously, have been drawn respectively under TRM0, RRU6 and RRU7
Chip time delay, as shown in Fig. 5 ~ 7.
Tripartite confrontation equipment computational methods：Relative time delay is calculated using the relative values between PN Offset in CDMA Finger
（Because the Offset of tripartite confrontation absolute value is inaccurate, relative value is only considered）, RRU6 exists relative to TRM0 time delays
3.5chips or so, RRU7 are relative to RRU6 time delays in 9.4chips or so（This time delay is the place of equipment after Huawei RRU cascades
Manage time delay）, relative time delays of the RRU7 relative to TRM0 is in 12.9chips.
Agilent equipment frequency sweep can immediately arrive at the delay (chips) under each equipment：Delay exists under TRM0
0chip, RRU6 delay are in 3chips, and RRU7 delay is in 13chips.
In terms of the test result of two complete equipments, the time delay between TRM0 and RRU6 is substantially suitable, illustrates that Huawei's equipment is most short
Delay compensation serves more preferable effect, and RRU7 time delay is to be cascaded because of RRU7 and RRU6, and Huawei's equipment is to RRU
Cascade device has certain processing delay（9chips or so）.
According to test result, the search window of east green grass or young crops Liu family 7 sector can return to normal value, high iron test number before and after optimization
It is as follows according to contrasting：
From the point of view of Fig. 8 contrast, search speed after the base station search window reduction such as committee of Wucheng village, Dong's Zheng Lu modeling, eastern green grass or young crops Liu Jia
Improve and the signal in the section is also substantially improved.
Specific implementation：Only with tail optical fiber it need to carry out jumper connection in east green grass or young crops Liu Jia with week pool bridge computer room.
Eastern green grass or young crops connected mode original Liu Jia is：It is directly connected to by TRM0 on UBRI0 mouths.
As shown in figure 9, present connected mode：
East green grass or young crops Liu Jia sides TRM0 is connected to 17 and 18 mouthfuls on ODF, and UBRI is connected to 15 and 16 mouthfuls on ODF；All Tang Qiao sides ODF
3 mouthfuls of connections 5 mouthfuls of ODF, ODF, 4 mouthfuls of 6 mouthfuls of ODF of connection, i.e., do primary Ioops on all pool abutment station ODF.
It is to have between eastern green grass or young crops Liu family ODF 15＆16 mouths and ODF17＆18 mouthfuls and week pool bridge ODF 3＆4 mouths and ODF5＆6 mouthfuls
Ready-made cable resource.
The present invention using reverse thinking by increasing by the way of short cable length rather than traditional long optical cable mode of shortening,
So that the shorter RRU of script cable length after roundabout cable length close to the longer RRU of cable length optical cable, thoroughly
Optical cable is poor between eliminating RRU, and then solves the optical cable delay problem that same PN-RRU is brought.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (4)
1. a kind of be used to shorten the method with PN-RRU time delays, it is characterised in that comprises the following steps：
Step 1: inside measurement BBU all same PN RRU cable length, cable length most short RRU is found out respectivelySAnd optical cable
Length most long RRUL；
Step 2: searching the Optical Cable information material of existing network, most long RRUL cable length L is calculated, according to routing iinformation
Data, selects cable length closest to L/2 fiber cable cross connection box as roundabout point, preferred by RRUSIt is connected to by optical cable circuitous
Hui Dian, then BBU is connected to by optical cable by roundabout point, form RRUSNew optical cable path so that RRUSCable length approach
RRULCable length；
Step 3: repeat step one and step 2, are less than RRU by each cable lengthLRRU optical cable path carry out it is roundabout elongate,
So that final all RRU cable lengths all with RRULCable length is approached.
2. a kind of method for being used for shortening with PN-RRU time delays according to claim 1, it is characterised in that：The step 2
In find out cable length most short RRUSWith cable length most long RRULSpecially：Directly inquired about on the webmaster of equipment manufacturer
Obtain.
3. a kind of method for being used for shortening with PN-RRU time delays according to claim 1, it is characterised in that：The step 2
It is middle by RRUSRoundabout point is connected to by optical cable, then BBU is connected to by optical cable by roundabout point, is specially：Respectively in RRUSIt is residing
Change its wiring in the corresponding ODF in base station and the corresponding ODF in base station residing for roundabout point, with reference to original optical cable between each base station
Circuit, sets up RRUSThe optical cable path between base station residing for residing base station and roundabout point, while setting up residing for roundabout point
Optical cable path between base station and BBU, forms RRUSThe new loop between BBU.
4. a kind of method for being used for shortening with PN-RRU time delays according to claim 3, it is characterised in that：The RRUSInstitute
The corresponding ODF in base station at place includes the first fiber optic cable interface, the second fiber optic cable interface, and the first fiber optic cable interface is used to connect BBU, the second light
Cable interface is used to connect RRUS；The corresponding ODF in base station residing for the roundabout point includes the 3rd fiber optic cable interface, the 4th optical cable and connect
Mouthful；Optical cable is provided between first fiber optic cable interface and the 4th fiber optic cable interface, between the second fiber optic cable interface and the 3rd fiber optic cable interface
Provided with optical cable；3rd fiber optic cable interface and the 4th fiber optic cable interface are connected by wire jumper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611090623.8A CN107070557A (en) | 2016-11-30 | 2016-11-30 | It is a kind of to be used to shorten the method with PN RRU time delays |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201611090623.8A CN107070557A (en) | 2016-11-30 | 2016-11-30 | It is a kind of to be used to shorten the method with PN RRU time delays |
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ID=59618958
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| CN201611090623.8A Pending CN107070557A (en) | 2016-11-30 | 2016-11-30 | It is a kind of to be used to shorten the method with PN RRU time delays |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000015168A (en) * | 1998-08-27 | 2000-03-15 | 서정욱 | Method for compensating delay of pilot signal in mobile telecommunication system |
| CN101098328A (en) * | 2007-06-29 | 2008-01-02 | 中兴通讯股份有限公司 | Base band and RF system synchronization and time delay compensation process |
| CN201623377U (en) * | 2009-11-23 | 2010-11-03 | 中国移动通信集团设计院有限公司 | Outdoor comprehensive distribution box |
-
2016
- 2016-11-30 CN CN201611090623.8A patent/CN107070557A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000015168A (en) * | 1998-08-27 | 2000-03-15 | 서정욱 | Method for compensating delay of pilot signal in mobile telecommunication system |
| CN101098328A (en) * | 2007-06-29 | 2008-01-02 | 中兴通讯股份有限公司 | Base band and RF system synchronization and time delay compensation process |
| CN201623377U (en) * | 2009-11-23 | 2010-11-03 | 中国移动通信集团设计院有限公司 | Outdoor comprehensive distribution box |
Non-Patent Citations (1)
| Title |
|---|
| 朱青等: ""高铁用户感知提升方法研究与实践"", 《电信技术》 * |
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Application publication date: 20170818 |