CN104735681B - The setting method of LTE network in high ferro environment - Google Patents
The setting method of LTE network in high ferro environment Download PDFInfo
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- CN104735681B CN104735681B CN201410606791.2A CN201410606791A CN104735681B CN 104735681 B CN104735681 B CN 104735681B CN 201410606791 A CN201410606791 A CN 201410606791A CN 104735681 B CN104735681 B CN 104735681B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
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Abstract
The present invention provides a kind of setting method of LTE network in high ferro environment, the LTE network includes N number of base station and antenna, the N ＞ 1；The base station is interspersed in railway both sides, form of zigzag cloth station；The incidence angle θ of the base station is not less than 10 degree；The base station distance Along Railway vertical range D is ranging from：S/2*tan θ ＜ D ＜ S/2, S therein are base station station spacing, θ is minimum incidence angle.The present invention can help operator to create good LTE overlay networks, reduce the harmful effect of train various factors in high speed movement, ensure that signal quality, improve user experience by targetedly carrying out the network planning of high ferro scene.
Description
Technical field
The present invention relates to a kind of setting methods of LTE network in the communications field more particularly to high ferro environment.
Background technology
National high-speed railway planning construction is planned for the year two thousand twenty, and personal rapid transit will be established between provincial capital and big and medium-sized cities and is led to
Road, including " four vertical four is horizontal " railway Planning of Express Passenger Corridor and three intercity personal rapid transit systems.Expect the year two thousand twenty, China 200
Kilometer and the high speed railway construction mileage of the above speed per hour will be more than 1.8 ten thousand kilometers, will account for the half of world's high-speed railway total kilometrage
More than.
High speed high ferro covering mileage is long, and the passenger's spare time for taking high speed high ferro is more, big to network demand, includes not only
Voice demand, video requirement, also high speed data requirements.But existing 3G network railway covering quality is poor, cannot meet passenger day
The voice and data traffic requirement that benefit increases, therefore build the high speed high ferro LTE network that a signal is good, covering is wide, online is fast
It is very important, health service revenue can not only be increased, promote user's perception, the image construction to operator is also of great advantage.
After train speed raising, vehicle travel speed in dedicated track is fast, due to by high speed movement rapid fading,
The influence of Doppler effect, train material to many factors such as radio signal attenuation and dereliction coverage cell, interior mobile phone are used
When family carries out mobile communication, tend to occur phenomena such as switching is chaotic, be not turned on, abnormal call drop.To sum up, high speed high ferro is special
Different and complicated network characteristic brings no small problem to mobile communication.
Invention content
The purpose of the present invention is to provide a kind of setting methods of LTE network in high ferro environment, reduce train high-speed mobile
The harmful effect of many factors in the process.
The purpose of the present invention is what is be achieved through the following technical solutions.
The setting method of LTE network in a kind of high ferro environment, the LTE network includes N number of base station and antenna, the N ＞
1；The base station is interspersed in railway both sides, form of zigzag cloth station；The incidence angle θ of the base station is not less than 10 degree；It is described
Base station distance Along Railway vertical range D is ranging from：S/2*tan θ ＜ D ＜ S/2, S therein are base station station spacing, θ is most
Small incidence angle；
Along the railway, the region that periphery user therein is few or railway is straight, the antenna use the narrow wave of high-gain
Beam antenna；Urban district therein, suburb have station or the cambered region of railway, the antenna to use medium gain day on the way
Line；Tunnel area therein, the antenna is using leakage cable；
There is no the tunnel area that wireless signal covers in 200m or less for the length that railway is passed through, using in tunnel face
The mode that antenna emits tunnel interior orientation is set；
It is for lengthModerate-length tunnel and length be more than 1000m long tunnel, use
The coverage mode that RRU is combined with leakage cable；
For continuous tunnel, the coverage mode combined with leakage cable using directional aerial：It is adjacent using leakage cable covering in tunnel
Base station is established in the centre in two tunnels, is extended outwardly using directional aerial, in tunnel and belongs to a cell outside tunnel；
When the cable mode using leakage, the coverage distance calculating of leakage cable is as follows：
Wherein, Pin：Leak cable input terminal injecting power；
P：It is required that covering cell-edge；
L1：Cable coupling loss is leaked, cable index is leaked；
L2：Human body declines；
L3：Width factor L3=20Lg (d/2), d are terminal in compartment at a distance from leakage cable；
L4：Decay surplus；
L5：Car body is lost；
S：Every meter of leakage cable feeder loss.
Wherein, in this method, the base station of the bend corner region for being set to the railway, which is set to bend
In turning.
Wherein, the base station covers networking mode using binary channels RRU.
Wherein, the binary channels RRU coverings networking mode includes：The double RRU of single pole two-way coverage modes back-to-back, single pole list
The two-way coverage mode of RRU work(point.
Wherein, along the railway, urban district or Plain therein region, the base station use public network coverage mode；Wherein
Suburb either the rural areas base station use public network or private network coverage mode；Mountain area or hilly region therein, institute
It states base station and uses private network coverage mode.
It is for lengthModerate-length tunnel and length be more than 1000m long tunnel, use
The coverage mode that RRU is combined with leakage cable；
For continuous tunnel, the coverage mode combined with leakage cable using directional aerial：It is adjacent using leakage cable covering in tunnel
Base station is established in the centre in two tunnels, is extended outwardly using directional aerial, in tunnel and belongs to a cell outside tunnel.
Compared with prior art, the beneficial effects of the present invention are：Network by targetedly carrying out high ferro scene is advised
It draws, operator can be helped to create good LTE overlay networks, reduce train various factors in high speed movement
Harmful effect ensure that signal quality, improve user experience.
Description of the drawings
Fig. 1 be in the embodiment of the present invention base station and rail apart from schematic diagram；
Fig. 2 is the double RRU of single pole two-way covering scheme schematic diagrames back-to-back in the embodiment of the present invention；
Fig. 3 is the two-way covering scheme schematic diagram of single pole list RRU work(point in the embodiment of the present invention；
Fig. 4 is that high ferro private network covers adjacent section planning schematic diagram in the embodiment of the present invention；
Fig. 5 is tunnel leakage cable coverage distance estimation schematic diagram in the embodiment of the present invention；
Fig. 6 is medium tunnel of embodiment of the present invention covering schematic diagram；
Fig. 7 is that single hole double track leakage cable lays schematic diagram in the embodiment of the present invention；
Fig. 8 is that continuous tunnel covers schematic diagram in the embodiment of the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
A kind of LTE network plan of establishment suitable for high ferro scene is proposed in the present embodiment, includes mainly following aspect：
Base station selection, coverage mode, lectotype selection, networking mode, tunnel scheme.It is described in detail respectively below in conjunction with attached drawing.
(1) base station selection
With the reduction of incidence angle, compartment penetration loss increasing degree increases.When incidence angle θ is when within 10 degree,
Train penetration loss amplitude is obviously accelerated, therefore in network design, it is proposed that uses 10 degree or more of incidence angle.
As shown in Figure 1, it is assumed that base station station spacing is S, H=S/2*tan θ, it is proposed that base station distance Along Railway vertical range D
Ranging from (H, S/2).
As S=1100m, D=(97,550) m suggests that base station can be selected in 97~550 meters from rail ranges.
High ferro base station selection should be interspersed as possible in railway both sides, form of zigzag cloth station, to help switch area is improved
Domain and to receive signal quality conducive to both sides user in compartment relatively uniform.For ") " or " (" shape bend corner region should select to turn
Cloth station in angle, to help the influence of base station coverage direction and orbital direction angle reduction Doppler frequency shift is reduced.
(2) coverage mode
According to the humanistic environment and lineament passed through in high ferro traveling process, the coverage mode suggestion for different scenes
It is as follows：
1 each scene high ferro coverage mode of table
| Environment | Lineament | It is recommended that coverage mode |
| Urban district | Districts and cities are gentle | Public network covers, and is equipped with base station along optimization |
| Suburb | Small towns is more | Public network or private network covering |
| Rural area | Population distribution is wider | Public network or private network covering |
| Mountain area | Height above sea level margin is larger, with a varied topography, and inclined-plane is steeper | Private network covers |
| Hills | Mountain top shape is perfectly round, and the ridges Gu Kuan are low, and inclined-plane is relatively slow | Private network covers |
| Plain | Ground broad flat has slight relief | Public network covers, and is equipped with base station along optimization |
(3) lectotype selection
1) antenna model selection
1. high-gain narrow beam antenna
In order to increase the coverage distance of single base station, switching times are reduced, high ferro scene is proposed with the narrow lobe day of high-gain
Line is covered.
High-gain narrow beam antenna is suitable for the fewer rural areas of periphery user, the more straight region of railway.
2. medium gain antenna
Suitable for urban district, suburb, there are station, the cambered region of railway on the way.
3. leaking cable
Suitable for tunnel scene.
2) base station type selecting
Distributed base station is suitble to the linear covering scene of high ferro：Without machine room resource, BBU is centrally placed, convenient for centralized management
And maintenance, RRU fiber optic stretch are convenient for fibre optic installations.
High ferro can be used binary channels RRU and carry out covering networking, promotes network data service rate using MIMO, uses simultaneously
More RRU cell combinings reduce handover between cells, to promote network performance.Binary channels RRU networkings can be divided into as shown in Figure 2
Two-way covering and single RRU work(as shown in Figure 3 divide two-way covering scheme to double RRU back-to-back.
Binary channels RRU networking equipments are small, facilitate deployment, and MIMO can be realized in conjunction with dual-channel antenna；Multiple RRU cascades
When, cost-effective and reduction engineering construction difficulty.
1. RRU cascade networks
In LTE system, the data communicated between BBU and RRU are I/Q data.I/Q data is carried on optical fiber and is passed
It is defeated, therefore I/Q data bandwidth is limited by Ir optical port line rates.It is 7 grades since Ir agreements limit maximum cascade number, and considers
Constraint, capacity and reliability of practical application etc., it is proposed that RRU cascades number and is no more than 4 grades.When cascaded RRUs, multiple RRU need to share
The increase of Ir bandwidth resources, data volume greatly improves Ir interface data transmission rate requirements.
2. investment analysis
The investment of distributed base station list station is about 1.45 times of remote radio investment.Using RRU cascade networks, can reduce investment outlay
About 20% or more.
(4) networking mode
Public network or private network form can be used in the covering of high ferro.
1) public network networking
Dedicated network construction covers line of high-speed railway network to be solved with dedicated network, and dedicated network is opposite with big net only
Vertical, network construction and planning need to separately be made to consider, the later stage network optimization is relatively easy, need to consider being connected between big net.Private network
Networking is suitable for the mountain area that high ferro need to pass through, hills, suburb, rural area scene.
A, the adjacent section planning of high ferro private network and station room point
Gate position AT STATION, high ferro private network website need to switch mutually with station room point, and adjacent section planning need to follow as follows
Principle：
1. interworking neighboring BS relationship is divided in high ferro private network and station room
It gets on or off the bus region in railway platform 2. private network and website room cutting change place try not to fall
3. station room point and the mutual matched adjacent zone of public network
B, the adjacent section planning along high ferro
Only need to consider on the section of high ferro during operation on chain cell former and later two directions each cell as
Adjacent area, the adjacent section planning with public network, it is proposed that unidirectional adjacent area is configured, it is as follows：
1. mutual matched adjacent zone between private network in high railway line, successful switch of the guarantee private network user in route minizone；
2. configuring unidirectional adjacent area with periphery macro station, ensure that public network user does not switch to private network to influence the capacity of private network.
It is as shown in Figure 4 that high ferro private network covers adjacent section planning.
(5) tunnel scheme
1) cable coverage distance is leaked
When train high speed passes through tunnel, prodigious wind pressure can be formed in tunnel, to ensure that signal receives steady in compartment
Fixed and train traffic safety is proposed with leakage cable in tunnel and is covered.As shown in figure 5, the covering of leakage cable
Distance calculates as follows：
Wherein, P：Leak cable input terminal injecting power；
P：It is required that covering cell-edge；
L1：Leak cable coupling loss, leakage cable index (95% probability)
L2：Human body declines；
L3：Width factor L3=20Lg (d/2), d are terminal in compartment at a distance from leakage cable；
L4：Decay surplus；
L5：Car body is lost；
S：Every meter of leakage cable feeder loss.
It is as shown in the table that cable technical indicator is leaked in RFS producers：
2 RFS of table reveals cable technology index
According to the leakage cable technical indicator that RFS is provided, leakage cable covers estimation such as following table in tunnel：
Cable covering estimation is leaked in 3 tunnel of table
It is found that the leakage unilateral coverage distance of cable is 628m.Simultaneously in view of situation in Tunnel, generally have every 500m
One refuge chamber reveals the unilateral covering 628m of cable, i.e., the installation site of RRU is essentially every 1000m mono- in tunnel.Leakage
Cable can be laid in tunnel-side, highly should be contour with train window, and general recommendations is apart from rail level 2.1m~2.6m.
2) switching band setting
The switching of LTE tunnel covering may be provided at two regions：In tunnel and outside tunnel exit.Since tunnel face is narrower
It is narrow, decay after causing the wireless signal outside tunnel to enter tunnel serious, if switched here with signal in tunnel, it will cause
Handover success rate reduces, and causes speech quality to decline, or even cause call drop.Directional aerial can be usually installed at tunnel face, it will
Signal extends to outside tunnel in tunnel, and switching band is arranged outside tunnel exit.
For the switching for avoiding excessive, generally use RRU is total to the mode of cell, and one is covered with the signal of the same cell
Tunnel.For the tunnel of speciality, a cell is difficult to cover whole tunnel, and switching band can be arranged in tunnel at this time.It needs to set
Set the overlapping coverage areas of two cells of switching, the same macro station of evaluation method, when estimation result is 300km/h or so, in tunnel
Minizone overlapping coverage areas is about 200m or so.
3) length/short tunnel covers scheme
1. short tunnel
There is no the tunnel that wireless signal covers in 200m or less for length, can be used and antenna is set to tunnel in tunnel face
The mode of interior orientation transmitting.Antenna should regard as far as possible leads to entire tunnel, and switching band is arranged outside tunnel, while wanting integrating tunnel all
It encloses and the railway covered and region is needed to consider together.
In 2., long tunnel
It is more than the long tunnel of 1000m in the tunnel of the moderate-lengths such as 200~1000m and length for length, nothing in tunnel
Signal covers, it is proposed that using the coverage mode of RRU+ leakage cables, as shown in Figure 6.When if you need to which multiple RRU are arranged, it should use as possible more
RRU is total to cell manner construction, reduces switching times.
The height of leakage cable installation answers apparent distance situation to be arranged, and single hole is single-row or single hole double track but without the possible tunnel of meeting
Road, leakage cable is laid in the tunnel wall of side, highly contour with train window；The tunnel of single hole double track and possible meeting, leaks cable cloth
If two row trains visually lead to leakage cable when height should ensure that meeting.It is as shown in Figure 7 that single hole double track leakage cable lays mode.
3. continuous tunnel covers
As shown in figure 8, for having multiple tunnels and continuous tunnel closely spaced each other, it is contemplated that using orientation day
The mode of line+leakage cable is covered：Using leakage cable covering in tunnel, base station is established in the centre in two tunnels, using fixed
It extends outwardly to antenna, a cell is belonged to outside in tunnel and tunnel, reduce switching band.
The rapid development of China's high speed high ferro is with rapid changepl. never-ending changes and improvements, with the arrival of information age, information when traveller's
Transmission it is unimpeded whether, be related to the service quality of mobile operator and the quality of traveller's environment, therefore public's movement is logical
Wireless coverage of the letter system within the scope of road and rail is more prominent.The present invention is by targetedly carrying out high speed high ferro scene
The network planning can help operator to create good LTE overlay networks：
(1) influence of the Doppler frequency shift to High-speed Circumstance is slight, can complete frequency error school by base station receiver
Just and frequency deviation is quickly changed and effectively compensated, but the influence to high ferro scene be can not ignore, it is proposed that uses 1800M
Frequency range is covered and suggests that base station is selected in apart from rail 97~550m ranges, and station spacing is 1100 meters.
(2) since web experience decline caused by being switched fast can be by planning suitable overlapping region (it is recommended that high ferro is special
Net scene overlapping switching band is set as 200m or so), and networking covering is carried out using binary channels RRU, promote net using MIMO
Network data service rate, while more RRU cell combinings are used, handover between cells are reduced, to promote network performance.
(3) it for the tunnel scene of high ferro, can complete to cover by way of leaking cable+RRU and being combined.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (5)
1. the setting method of LTE network in a kind of high ferro environment, the LTE network includes N number of base station and antenna, the N ＞ 1；
It is characterized in that, the base station is interspersed in railway both sides, form of zigzag cloth station；The incidence angle θ of the base station is not less than
10 degree；The base station distance Along Railway vertical range D is ranging from：S/2*tan θ ＜ D ＜ S/2, S therein is between the station of base station
It is minimum incidence angle away from, θ；
Along the railway, the region that periphery user therein is few or railway is straight, the antenna use high-gain narrow beam day
Line；Urban district therein, suburb have station or the cambered region of railway, the antenna to use medium gain antenna on the way；Its
In tunnel area, the antenna is using leakage cable；
There is no the tunnel area that wireless signal covers in 200m or less for the length that railway is passed through, is arranged using in tunnel face
The mode that antenna emits tunnel interior orientation；
It is for lengthModerate-length tunnel and length be more than 1000m long tunnel, using RRU with
Leak the coverage mode that cable combines；
For continuous tunnel, the coverage mode combined with leakage cable using directional aerial：Using leakage cable covering, adjacent two tunnel in tunnel
Base station is established in the centre in road, is extended outwardly using directional aerial, in tunnel and belongs to a cell outside tunnel；
When the cable mode using leakage, the coverage distance calculating of leakage cable is as follows：
Wherein, Pin：Leak cable input terminal injecting power；
P：It is required that covering cell-edge；
L1：Cable coupling loss is leaked, cable index is leaked；
L2：Human body declines；
L3：Width factor L3=20Lg (d/2), d are terminal in compartment at a distance from leakage cable；
L4：Decay surplus；
L5：Car body is lost；
S：Every meter of leakage cable feeder loss.
2. the setting method of LTE network in high ferro environment as described in claim 1, which is characterized in that in this method, for setting
It is placed in the base station of the bend corner region of the railway, which is set in bend turning.
3. the setting method of LTE network in high ferro environment as described in claim 1, which is characterized in that the base station is using double
Channel RRU covers networking mode.
4. the setting method of LTE network in high ferro environment as claimed in claim 3, which is characterized in that the binary channels RRU covers
Lid networking mode includes：Two-way coverage mode, single pole list RRU work(divide two-way coverage mode to the double RRU of single pole back-to-back.
5. the setting method of LTE network in high ferro environment as described in claim 1, which is characterized in that along the railway, wherein
Urban district or Plain region, the base station use public network coverage mode；Suburb therein or rural areas, the base station are adopted
With public network or private network coverage mode；Mountain area or hilly region therein, the base station use private network coverage mode.
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| CN108513307B (en) * | 2017-02-28 | 2021-08-06 | 工业和信息化部电信研究院 | Terminal testing method under simulated high-speed rail scene |
| CN107959535B (en) * | 2017-11-03 | 2020-10-16 | 湖北邮电规划设计有限公司 | Method for measuring large-scale fading value in subway tunnel |
| CN107888306B (en) * | 2017-11-03 | 2021-06-11 | 湖北邮电规划设计有限公司 | Method for measuring small-scale fading value in subway tunnel |
| CN107888309B (en) * | 2017-11-03 | 2021-04-16 | 湖北邮电规划设计有限公司 | Measuring method for correcting radio propagation model in subway tunnel |
| CN108566285B (en) * | 2017-11-28 | 2021-04-27 | 南瑞集团有限公司 | High-reliability planning method for power wireless private network for avoiding self-interference |
| CN110061341A (en) * | 2018-01-19 | 2019-07-26 | 中国联合网络通信集团有限公司 | A kind of railway covering method, broad beam high-gain aerial and multiband common antenna |
| CN109842885A (en) * | 2019-01-03 | 2019-06-04 | 中国联合网络通信集团有限公司 | A kind of Equipments Choosing Method and device based on scene |
| CN110505665B (en) * | 2019-08-08 | 2021-12-14 | 武汉绿色网络信息服务有限责任公司 | Method and system for switching cell of high-speed rail mobile terminal user |
| CN110601737B (en) * | 2019-09-12 | 2023-03-28 | 杭州电子科技大学 | Internet of vehicles link reliability enhancing method based on multi-beam parallel transmission |
| CN113411772B (en) * | 2021-06-09 | 2022-12-23 | 国铁吉讯科技有限公司 | 5G networking system and method in high-speed rail scene |
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