CN105227450B - A kind of rail traffic WLAN gateway equipment - Google Patents
A kind of rail traffic WLAN gateway equipment Download PDFInfo
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- CN105227450B CN105227450B CN201510739977.XA CN201510739977A CN105227450B CN 105227450 B CN105227450 B CN 105227450B CN 201510739977 A CN201510739977 A CN 201510739977A CN 105227450 B CN105227450 B CN 105227450B
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Abstract
The invention discloses a kind of rail traffic WLAN gateway plug-in units, comprising: for accessing wireless network, RADIO module that reception/transmission wireless signal is wireless；It is connected with the wireless RADIO module, for carrying out the realization of analog-to-digital conversion and network function to wireless signal or wire signal, supporting the CPU processing module of narrow channel standard；And be connected with the CPU processing module, the signal handled through the CPU processing module is converted to the wired ethernet module for meeting the electric frequency signal of ethernet standard and sending.Rail traffic provided by the present invention WLAN gateway plug-in unit solves the problems, such as that non-overlapping channel is few under the premise of not changing wireless network MAC layer above agreement.In the case where channel narrows, according to on-site wireless environment, can flexible configuration working channel, avoid same adjacent frequency from interfering, avoid congestion, improve the transmission quality of data；And under the premise of realizing network equal performance index, the distance of covering is increased.
Description
Technical field
The present invention relates to regulation traffic applied technical fields, more particularly to a kind of rail traffic WLAN gateway equipment.
Background technique
In rail traffic application field, the Wifi wireless network card of integrated universal (makes generally on device on locomotive or vehicle
With the 20MHz channel of standard), network interface card and trackside wireless access point AP establish connection, with realizing vehicle two-way communication.But when train is transported
It when scanning frequency degree is more than 120km/h, is tested by theory analysis and experiment, information transmission bandwidth sharply declines, it may appear that data pass
The problems such as defeated delay, data-bag lost and error code, so that information transmission quality be caused to decline.Secondly as in-vehicle wireless communication
It to be carried out between equipment and trackside wireless access point AP frequently, fast move switching roaming, make message switching center data processing
Load increases, and causes data congestion even communication disruption occur, has an important influence on to information transmission reliability.
The wireless frequency that WLAN wireless communication uses is in 2.4GHz frequency range or 5.8GHz frequency range, especially in 2.4GHz frequency range
It is interior to be easy to generate problem of co-channel interference using the system of the frequency with other, such as PIS system.
Especially in city rail traffic signal system, it is double to form real time bidirectional using overlapping coverage mode for wireless network
Channel redundancy structure, to make up the non-faulting safety defect of wireless communication.Trackside radio channel is carried out according to 100% Duplication
Design, ensure that, in a wireless access point failure, train signal will not be lost.The network need of work of usual two redundancies
Two nonoverlapping channels.2.4GHz frequency range only has 3 nonoverlapping channels, if PIS system and CCTV system respectively occupy one
A channel, then the wlan network of CBTC system will be difficult to be formed after double nets or networking with adjacent frequency serious interference.
Summary of the invention
The object of the present invention is to provide a kind of rail traffic WLAN gateway equipment, it is therefore intended that solves in the prior art not
Overlapped channels are few, interfere with adjacent frequency, the problem that data transmission quality is lower.
In order to solve the above technical problems, the present invention provides a kind of rail traffic WLAN gateway equipment, comprising:
For accessing wireless network, RADIO module that reception/transmission wireless signal is wireless；With the wireless RADIO module
It is connected, for carrying out the realization of analog-to-digital conversion and network function to wireless signal or wire signal, supporting narrow channel standard
CPU processing module；And be connected with the CPU processing module, the signal handled through the CPU processing module is converted to and is met
The electric frequency signal of ethernet standard and the wired ethernet module sent.
Optionally, the pretreatment that the wireless RADIO module is also used to amplify the wireless signal received, filter
Operation.
Optionally, the CPU processing module is used to carry out analog-to-digital conversion and network function to wireless signal or wire signal
Can realization include:
The CPU processing module is used to carry out wireless signal or wire signal analog-to-digital conversion, to wireless signal or wired
Signal packages, forwards, routes, filters or configures operation.
Optionally, the wireless RADIO module includes: for accessing wireless network
The wireless RADIO module is for accessing wireless network by way of active scan or drive sweep.
Optionally, the wireless RADIO module supports configuration 5MHZ, 10MHZ, 20MHZ or 40MHZ channel width.
Optionally, further includes:
Communication module, for carrying out initial configuration and status monitoring to the CPU processing module.
Optionally, the communication module is RS232 communication module.
Optionally, further includes:
LED display module is shown for the configuration information to the CPU processing module, processing information.
Rail traffic provided by the present invention WLAN gateway equipment is not changing the above agreement of wireless network MAC layer
Under the premise of, a kind of equipment on non-standard narrow channel that works is provided, solves the problems, such as that non-overlapping channel is few.Become in channel
In the case where narrow, according to on-site wireless environment, can flexible configuration working channel, avoid same adjacent frequency from interfering, avoid congestion, improve
The transmission qualities of data；And under the premise of realizing network equal performance index, the distance of covering is increased.
Detailed description of the invention
Fig. 1 is a kind of signal of a kind of specific embodiment of rail traffic WLAN gateway equipment provided by the present invention
Figure；
Fig. 2 is a kind of showing for another specific embodiment of rail traffic WLAN gateway equipment provided by the present invention
It is intended to.
Specific embodiment
The data throughout of WLAN is big, operates in ISM unlicensed band.
Current track field of traffic reorganizes and outfit field, the marshalling yard deployment ground WLAN AP in great Tie locomotive depot, transmits rolling stock
Record or status data；In field of urban rail, ground AP is largely disposed along trackside, mobile unit is enable to access
Wlan network, the business datums such as transmission CBTC；It, can be by the ground the WLAN AP group networking disposed along the line in tramcar field
Network transmits key business data.
It is dry with frequency but because the technical characterstic of WLAN itself, it does not support to fast move, and nonoverlapping channel quantity is few
It is serious to disturb congestion, is easy to be attacked, coverage distance is short, and switching is frequent；It is much asked in this way, being brought to field network plan optimization
Topic.
In consideration of it, core of the invention is to provide a kind of narrow channel WLAN gateway equipment, ISM band is equally operated in, but
Be that original working channel narrows, more non-overlapping channels can be provided, can flexibly based on on-site wireless environment into
Row deployment and configuration, reduce with frequency congestion, and prevent general wlan device from being attached with it, and what reduction was attacked can
Can, because working channel width narrows, signal interference ratio can be improved.Under the premise of meeting certain performance indicator, increase covering
Distance, while the frequency of effectively control switching and time.
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.Obviously, described embodiments are only a part of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
A kind of a kind of schematic diagram of specific embodiment of rail traffic provided by the present invention WLAN gateway equipment is such as
Shown in Fig. 1, which includes:
For accessing wireless network, RADIO module 1 that reception/transmission wireless signal is wireless；With the wireless RADIO mould
Block is connected, for carrying out the realization of analog-to-digital conversion and network function to wireless signal or wire signal, supporting narrow channel standard
CPU processing module 2；And be connected with the CPU processing module, the signal handled through the CPU processing module 2 is converted to
The wired ethernet module 3 for meeting the electric frequency signal of ethernet standard and being sent.
Rail traffic provided by the present invention WLAN gateway equipment, CPU processing module support narrow channel standard.Not
Under the premise of changing the above agreement of wireless network MAC layer, a kind of equipment on non-standard narrow channel that works is provided, is solved
The few problem of non-overlapping channel.In the case where channel narrows, according to on-site wireless environment, can flexible configuration working channel,
It avoids same adjacent frequency from interfering, avoids congestion, improve the transmission quality of data；And in the premise for realizing network equal performance index
Under, increase the distance of covering.
On the basis of upper one embodiment, rail traffic WLAN gateway equipment provided by the present invention can also be into one
Step increases communication module 4, for carrying out initial configuration and status monitoring to the CPU processing module.
Specifically, which can use RS232 communication module.
On the basis of any of the above-described a embodiment, rail traffic WLAN gateway equipment provided by the present invention can be with
LED display module 5 is further increased, is shown for the configuration information to the CPU processing module, processing information.
As shown in Fig. 2, showing the present invention provides another specific embodiment of rail traffic WLAN gateway equipment
It is intended to.The equipment includes:
Wireless RADIO module 1, CPU processing module 2, wired ethernet module 3, communication module 4 and LED display module
5。
Wherein, wireless RADIO module is for accessing wireless network, reception/transmission wireless signal.
Specifically, wireless RADIO module can be used for being responsible for the amplification of wireless signal, filtering etc..
CPU processing module is connected with wireless RADIO module, for carrying out analog-to-digital conversion to wireless signal or wire signal
And the realization of network function.Specifically, CPU processing module is for being responsible for group packet, the forwarding, road of processing Wireless-wire data
By, filtering, configuration etc. network functions realization.
Wired ethernet module is connected with CPU processing module, and the signal handled through CPU processing module is converted to and is met
The electric frequency signal of ethernet standard and the wired ethernet module sent.Wired ethernet module is specifically used for being responsible for realization
Ethernet physical layer correlation function.
The WLAN gateway equipment of rail traffic provided by the present embodiment, wireless RADIO module are supporting IEEE
Under the premise of 802.11a/b/g/n standard system, while supporting configuration 5MHz, 10MHz, 20MHz, 40MHz channel width, and energy
The channel of different bandwidth is selected by software.Under 2.400GHz~2.4835GHz frequency range, channel center's frequency point is existing 1~14
Number channel center's frequency point.Under 5.725GHz~5.85GHz frequency range, channel center's frequency point is existing 149,153,157,161,165
Number channel center's frequency point.On this basis, the embodiment of the present invention further increases 5.730GHz and 5.840GHz two frequency bins
(5MHz, 10MHz channel is used only).Wireline interface supports adaptive 10/100Based-T ether as defined in IEEE802.3 standard
Network Communication.
Under the premise of wireless Radio module traffic rate related rate as defined in realization IEEE802.11a/b/g/n,
When 10MHz channel width, transmission rate halves, and in 5MHz channel width, transmission rate is the 1/4 of standard.
Wireless Radio module supports within the scope of 2.4GHz, 5.8GHz working frequency range that automatic obtain is believed with setting work by hand
Road.Wireless Radio module support accesses wireless network in a manner of active scan, drive sweep.In active scan, poll is believed
Road carries automatic acquisition of scientific information working channel according to AP beacon frame and is accessed；In drive sweep and when being switched fast (configuration),
It should be able to be according to manual assigned work channel access AP.
As a kind of specific embodiment, to guarantee switching, wireless Radio module sets switching threshold in a certain range
Value, the value are the highest signal strength in two AP alternate covering areas.
Wired ethernet module supports adaptive 10/100Based-T ethernet communication as defined in IEEE802.3 standard；Energy
It is managed for configuration by standard RS-232 serial ports, is only used for being managed equipment, is not used in business data transmission.It is wired with
Too net module supports network address translation (NAT and NAPT), static routing and part firewall functionality (including to be based on MAC/IP/
The packet filtering of PORT).
Rail traffic provided by the present invention WLAN gateway equipment, CPU processing module support narrow channel standard.Not
Under the premise of changing the above agreement of wireless network MAC layer, a kind of equipment on non-standard narrow channel that works is provided, is solved
The few problem of non-overlapping channel., can be in existing frequency range according to on-site wireless environment in the case where channel narrows, spirit
Setting working channel living hides out common 1/6/11 equal channels, can flexible configuration working channel, avoid same adjacent frequency dry
It disturbs, avoids congestion, improve the transmission quality of data；And under the premise of realizing network equal performance index, covering is increased
Distance.
In addition, this equipment makes gateway work on narrow channel, and can have the function of gateway firewall, the public uses mark
The user of quasi- wifi channel can not access, and avoid public user and the access and access of illegal user, inherently improve
Safety.And the present invention can reduce frequency and the switching time of handover, to improve the transmission stability of equipment.Using
The present invention can also reduce the quantity of wireless aps by rail.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with it is other
The difference of embodiment, same or similar part may refer to each other between each embodiment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (7)
1. a kind of rail traffic WLAN gateway equipment characterized by comprising
For accessing wireless network, RADIO module that reception/transmission wireless signal is wireless；With the wireless RADIO module phase
Even, for carrying out the realization of analog-to-digital conversion and network function to wireless signal or wire signal, supporting the CPU of narrow channel standard
Processing module；And be connected with the CPU processing module, the signal handled through the CPU processing module is converted to meet with
The too electric frequency signal of network mark standard and the wired ethernet module sent；
Wireless Radio module is supported within the scope of 2.4GHz, 5.8GHz working frequency range, automatic to obtain and setting working channel by hand；
Wireless Radio module support accesses wireless network in a manner of active scan, drive sweep；The polling channel in active scan,
Automatic acquisition of scientific information working channel is carried according to AP beacon frame to be accessed；In drive sweep and when being switched fast, according to craft
Assigned work channel access AP.
2. rail traffic as described in claim 1 WLAN gateway equipment, which is characterized in that the wireless RADIO module is also
Pretreatment operation for amplifying, filtering to the wireless signal received.
3. rail traffic as described in claim 1 WLAN gateway equipment, which is characterized in that the CPU processing module is used for
The realization for carrying out analog-to-digital conversion and network function to wireless signal or wire signal includes:
The CPU processing module is used to carry out analog-to-digital conversion, to wireless signal or wire signal to wireless signal or wire signal
Package, forward, route, filter or configure operation.
4. rail traffic as claimed in claim 3 WLAN gateway equipment, which is characterized in that the wireless RADIO module branch
Hold configuration 5MHZ, 10MHZ, 20MHZ or 40MHZ channel width.
5. such as Claims 1-4 described in any item rail traffics WLAN gateway equipment, which is characterized in that further include:
Communication module, for carrying out initial configuration and status monitoring to the CPU processing module.
6. rail traffic as claimed in claim 5 WLAN gateway equipment, which is characterized in that the communication module is RS232
Communication module.
7. rail traffic as claimed in claim 6 WLAN gateway equipment, which is characterized in that further include:
LED display module is shown for the configuration information to the CPU processing module, processing information.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510739977.XA CN105227450B (en) | 2015-11-03 | 2015-11-03 | A kind of rail traffic WLAN gateway equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510739977.XA CN105227450B (en) | 2015-11-03 | 2015-11-03 | A kind of rail traffic WLAN gateway equipment |
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| CN105227450A CN105227450A (en) | 2016-01-06 |
| CN105227450B true CN105227450B (en) | 2019-01-15 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101123006A (en) * | 2006-08-09 | 2008-02-13 | 北京握奇数据***有限公司 | ETC system roadside unit based on WLAN and charging method |
| CN101888257A (en) * | 2010-06-21 | 2010-11-17 | 刘显福 | Method and system for sharing and multiplexing wired and wireless bandwidth |
| CN102083227A (en) * | 2010-11-17 | 2011-06-01 | 广州杰赛科技股份有限公司 | Wireless access device and method |
| CN203104809U (en) * | 2013-03-29 | 2013-07-31 | 黑龙江科技学院 | Communication gateway equipment for wireless sensor network |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8976761B2 (en) * | 2012-10-05 | 2015-03-10 | Cisco Technology, Inc. | High density deployment using transmit or transmit-receive interference suppression with selective channel dimension reduction/attenuation and other parameters |
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2015
- 2015-11-03 CN CN201510739977.XA patent/CN105227450B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101123006A (en) * | 2006-08-09 | 2008-02-13 | 北京握奇数据***有限公司 | ETC system roadside unit based on WLAN and charging method |
| CN101888257A (en) * | 2010-06-21 | 2010-11-17 | 刘显福 | Method and system for sharing and multiplexing wired and wireless bandwidth |
| CN102083227A (en) * | 2010-11-17 | 2011-06-01 | 广州杰赛科技股份有限公司 | Wireless access device and method |
| CN203104809U (en) * | 2013-03-29 | 2013-07-31 | 黑龙江科技学院 | Communication gateway equipment for wireless sensor network |
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| CN105227450A (en) | 2016-01-06 |
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Address after: The age of 412001 in Hunan Province, Zhuzhou Shifeng District Road No. 169 Patentee after: ZHUZHOU CRRC TIMES ELECTRIC Co.,Ltd. Address before: The age of 412001 in Hunan Province, Zhuzhou Shifeng District Road No. 169 Patentee before: ZHUZH CSR TIMES ELECTRIC Co.,Ltd. |
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