CN107659972A - A kind of data transfer optimization method in high-speed railway communication private network - Google Patents
A kind of data transfer optimization method in high-speed railway communication private network Download PDFInfo
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- CN107659972A CN107659972A CN201710216966.2A CN201710216966A CN107659972A CN 107659972 A CN107659972 A CN 107659972A CN 201710216966 A CN201710216966 A CN 201710216966A CN 107659972 A CN107659972 A CN 107659972A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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Abstract
A kind of data transfer optimization method in high-speed railway communication private network, high dynamic converter a HIDT1 and HIDT2 are respectively placed on the head of high ferro train and afterbody, the information exchange of user and LTE base station in compartment is completed by high dynamic converter (HIDT), HIDT1 and HIDT2 is responsible for down forwarding the communication information that LTE base station is sent to user in compartment, the information that user sends to LTE base station in forwarded upstream compartment.By installing a HIDT terminal respectively in the headstock and the tailstock of high ferro train, form space diversity, because two HIDT terminals are distant, the probability in rapid fading will substantially reduce two terminals simultaneously, mission controller is by comparing the signal to noise ratio snr of two-way reception signal, the preferable HIDT terminals of selection signal carry out signal transmitting, so as to overcome the rapid fading problem of signal.
Description
Technical field
The present invention relates to high ferro moving communicating field, the data transfer in the private network that communicated more particularly, to a kind of high-speed railway
Optimization method.
Background technology
At present, China runs high ferro total kilometrage up to 20,000 kilometers, occupies first place in the world, and does not come the year two thousand twenty, and operation mileage is total
Number is up to more than 14.5 ten thousand kilometers.Chinese high ferro is a trump of the China in global competition, and future will start one
Chinese high ferro storm.But high ferro train operation speed can reach more than 350km/h, existing mobile communication high ferro is utilized
Communicated in compartment with user and the problem of more be present, cause Consumer's Experience poor.For high ferro base station covering configuration, compartment casing
We are existing related for signaling storm caused by penetration loss, minizone frequent switching and Doppler frequency shift etc. caused by high-speed motion
Patent application.As Application No. CN201610186315.9, CN201610186313.X, CN201610186312.5,
CN201610186314.9 patent application, and detail related solution.
Wherein, high dynamic converter (HIDT) is described in patent of invention CN201610186313.X in detail.HIDT work
With being to communicate with providing relay forwarding service with the user in compartment for high ferro LTE base station.High dynamic is set to turn on high ferro train
Parallel operation (HIDI), in the LTE base station coverage of ground, high dynamic converter is train-ground communication pattern along high ferro train,
Without under the LTE base station overlay environment of ground along high ferro train, high dynamic converter is car star communication pattern.
In high ferro communication scenes, because high-iron carriage and surrounding environment cause the scattering, reflection and refraction of signal, draw
Play the Multipath Transmission of signal.The signal that HIDT is received is the superposition of direct signal, refracted signal and scattered signal etc., and it is synthesized
Signal amplitude shows as quick fluctuations.Due to multipath effect, the signal to noise ratio snr rapid decrease of system, system can be caused
Performance drastically deteriorates, and HIDT may be caused to go offline when serious, it is impossible to normal work.
In order to solve the problems, such as that system SNR deteriorates caused by the signal rapid fading of high ferro communication, the present invention proposes a kind of energy
The method for enough improving signal quality, so that high ferro train possesses preferably communication and internetworking in the environment of high-speed motion
Energy.
The content of the invention
The problem of purpose of the present invention is the signal rapid fading for high ferro communication environment, there is provided one kind improves high ferro train
The method of upper communication signal quality.
To reach above-mentioned purpose, the present invention uses following technical scheme：
A kind of data transfer optimization method in high-speed railway communication private network, high-speed railway communication private network include multiple LTE
Base station, a high dynamic converter HIDT is respectively placed on the head of high ferro train and afterbody1And HIDT2, pass through high dynamic converter
(HIDT) information exchange of user and LTE base station in compartment, HIDT are completed1And HIDT2It is responsible for down forwarding LTE base station and is sent to
The communication information of user in compartment, the information that user sends to LTE base station in forwarded upstream compartment, specific data transfer optimization
Process comprises the following steps：
Step 1)：LTE base station sends descending communication signal, i.e. LTE base station-＞ HIDT signals, now HIDT1And HIDT2Connect
Receive the signal；
Step 2)：HIDT1And HIDT2The signal to noise ratio snr of its reception signal is calculated respectively1And SNR2, and result of calculation is sent out
Deliver to signal controller；
Step 3)：Signal controller is according to SNR1And SNR2Value judged, select suitable high dynamic commutator end
As uplink communication links, signal handoff threshold is T, and specific data transfer criterion is as follows：
If previous moment utilizes HIDT2Terminal carries out signal transmitting as uplink communication terminal and sends uplink communication signal,
That is HIDT- ＞ LTE base stations signal, then
If SNR1＞ SNR2+ T, switch switching utilize HIDT1As uplink communication terminal, while cut off HIDT2It is up
Communication function,
If SNR1＜ SNR2+ T, then transmission signal still select HIDT2Terminal is as uplink communication terminal；
Step 4)：Utilize HIDT1Or HIDT2Uplink communication signal is sent to LTE base station, completion once completely communicated
Journey.
Wherein, the described usual values of signal handoff threshold T are about 3~6dB.
The technique effect of the present invention：
The essence of data transfer optimization method in high-speed railway of the present invention communication private network be high ferro train headstock and
The tailstock installs a HIDT terminal respectively, forms space diversity, because two HIDT terminals are distant, two terminals are located simultaneously
To be substantially reduced in the probability of rapid fading, mission controller by comparing the signal to noise ratio snr of two-way reception signal, selection signal compared with
Good HIDT terminals carry out signal transmitting, so as to overcome the rapid fading problem of signal.
Brief description of the drawings
Fig. 1：The data transfer optimization schematic diagram of high-speed railway communication private network.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment and accompanying drawing,
The present invention is described in more detail.
The invention provides the data transfer optimization method in a kind of high-speed railway communication private network, as shown in figure 1, in high ferro
The headstock and the tailstock of train respectively place a high dynamic converter (HIDT), and two HIDT receive the letter of LTE base station transmitting simultaneously
Number, the probability in deep fade will be dropped two HIDT reception signal significantly simultaneously due to two HIDT relatively far apart
It is low, so as to effectively improve the quality of reception signal.Two HIDT terminals are each by the signal to noise ratio (SNR of its signal1And SNR2)
Send the emission function that the poor HIDT terminals of noise are closed to signal controller, the preferable HIDT of simultaneous selection signal to noise ratio
Terminal completes HIDT and the uplink communication of LTE base station as launch terminal.Due to whole communication process select all the time signal to noise ratio compared with
Big HIDT terminals are launched, so the signal quality of system is effectively increased, so as to substantially reduce communication system interruption
Probability.
High-speed railway communication process is divided into downlink communication (LTE base station-＞ HIDT) and uplink communication (HIDT- ＞ LTE bases
Stand) process.As shown in figure 1, full communication is divided into 4 steps：
1. LTE base station sends descending communication signal, now HIDT1And HIDT2Receive the signal；
②HIDT1And HIDT2The signal to noise ratio snr of its reception signal is calculated respectively1And SNR2, and by result of calculation send to
Signal controller.Signal to noise ratio is the ratio of signal power and noise power, and unit generally represents that its calculation formula is as follows with dB：
For example, for HIDT-LTE systems, the transmission power of LTE base station is Pt=20W (i.e. [Pt]dB=43dBm), base station
Antenna gain is Gt=20dB, with a width of B=20MHz (i.e. [B]dB=73dBHz), HIDT receiving antenna gain is Gr=
15dB, noise power spectral density are assumed to be N0=-174dBm/Hz, then：
[Pt]dB=10log10(Pt)=10log10(20×103MW)=43dBm
[B]dB=10log10(B)=10log10(20×106Hz)=73dBHz
Assuming that the signal of Base Transmitter reaches HIDT, now HIDT signal to noise ratio snr by link load for L=150dB
It is calculated as：
HIDT received signal powers are：[Ps]dB=[Pt]dB+ Gt+Gr-L=-72dBm
Noise power is：[Pn]dB=[N0]dB+[B]dB=-174+73=-101dBm
Signal to noise ratio [SNR] nowdB=[Ps]dB-[Pn]dB=-72+101=29dB；
3. signal controller is according to SNR1And SNR2Value judged, select suitable HIDT terminals as uplink communication
Link, signal handoff threshold are T, and previous moment utilizes HIDT2Carry out uplink communication.Judgment criterion is：If SNR1＞ SNR2+
T, switch switch to HIDT1As up with letter terminal, while cut off HIDT2Uplink communication function；If SNR1＜ SNR2+
T, still select HIDT2As uplink communication terminal；
4. utilize HIDT1Or HIDT2Uplink communication signal is sent to LTE base station, completes once complete communication process.
Wherein, the usual values of signal handoff threshold T are about 3~6dB.
Because two high dynamic converters are separately mounted to headstock and the tailstock position of train, distance is more than hundreds of meters, because
The fading profiles of the transmission link of this two terminals and LTE base station are separate, that is, assume LTE base station → HIDT1Signal
With LTE base station → HIDT2The probability in deep fading is far smaller than one of them probability for being in deep fade to signal simultaneously, bright
Aobvious to reduce the probability that system is in deep fade, effectively improve system is energy.Meanwhile in order to avoid the frequent switching of terminal,
Suitable signal handoff threshold T can be selected according to the surrounding environment of high ferro train operation.
Embodiment one：
The high ferro train of normally travel, LTE base station transmitting downstream signal, HIDT1And HIDT2Receive the letter of LTE base station transmitting
Number.
In t1Moment, system utilize HIDT2Signal of communication in compartment is sent to LTE base station, the handoff threshold T of signal
=3dB.
In t1At+1 moment, two HIDT received signal to noise ratio is respectively SNR1=31dB, SNR2=29dB, although now
HIDT1Noise it is bigger, but be not above handoff threshold, then at the moment still with HIDT2Led to LTE base station
Letter.
When in t1At+2 moment, two HIDT received signal to noise ratio is respectively SNR1=30dB, SNR2=25dB, now SNR1-
SNR2=5dB, more than handoff threshold, therefore etching system switches to and utilizes HIDT at this1Communicated with LTE base station.
When in t1At+3 moment, two HIDT received signal to noise ratio is respectively SNR1=28dB, SNR2=29dB, now SNR1-
SNR2=-1dB, less than handoff threshold, therefore etching system still utilizes HIDT at this1Communicated with LTE base station.
Embodiment two：
The high ferro train of normally travel, LTE base station transmitting downstream signal, HIDT1And HIDT2Receive the letter of LTE base station transmitting
Number.
In t1Moment, system utilize HIDT1Signal of communication in compartment is sent to LTE base station, the handoff threshold T of signal
=6dB.
In t1+ 1 moment, HIDT1And HIDT2Received signal to noise ratio be respectively SNR1=30dB, SNR2=33dB, due to SNR2
＜ SNR1+ T, now still utilize HIDT1Carry out uplink communication.
In t1+ 2 moment, HIDT1And HIDT2Received signal to noise ratio be respectively SNR1=30dB, SNR2=28dB, according to switching
Criterion, now still utilize HIDT1Carry out uplink communication.
In t1+ 3 moment, HIDT1And HIDT2Received signal to noise ratio be respectively SNR1=19dB, SNR2=33dB, due to SNR2
＞ SNR1+ T, now signal controller switch to HIDT2Carry out uplink communication.
Shown by above example, by using two high dynamic converters, overcome due to signal rapid fading and lead
The shortcomings that causing system signal noise ratio SNR drastically to decline.If not using method of the present invention, only converted using a high dynamic
Device, such as only use HIDT1, then in t1At+3 moment, the signal to noise ratio of system is 19dB, than using the inventive method in t1+ 3 moment
The low about 14dB of signal to noise ratio.
Embodiment three：
The high ferro train of normally travel, LTE base station transmitting downstream signal, HIDT1And HIDT2Receive the letter of LTE base station transmitting
Number.
In t1Moment, system utilize HIDT1Signal of communication in compartment is sent to LTE base station, the handoff threshold of signal and is
T=4dB.
In t1+ 1 moment, high ferro train around there may be more blocking and (such as billboard, set by urban area
Wood etc.), cause the reception signal degradation of one of terminal, i.e. SNR1=10dB, SNR2=33dB, now SNR2＞
SNR1Switch is switched to HIDT by+T, signal controller2Complete uplink communication.
If using conventional method, only a high dynamic converter HIDT is used1, then in t1+ 1 moment, due to HIDT1By
Blocked to trees or building, the signal to noise ratio degradation for receiving LTE base station is SNR1=10dB.And utilize the side of the present invention
Method, using two high dynamic converter HIDT1And HIDT2, t1+ 1 moment HIDT1Signal to noise ratio decline, and HIDT2In the absence of trees
Or building blocks and the preferable SNR of signal quality2=33dB, it can now utilize HIDT2Received, i.e. the signal to noise ratio of system
SNR=33dB.System signal noise ratio than conventional method improves 23dB, and systematic function will be greatly enhanced.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, those skilled in the art can
To be modified to the technical scheme described in foregoing embodiments or carry out equivalent substitution to which part technical characteristic.
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in the present invention's
Within protection domain.
Claims (2)
1. a kind of data transfer optimization method in high-speed railway communication private network, it is characterised in that high-speed railway communication private network bag
Multiple LTE base stations are included, a high dynamic converter HIDT is respectively placed on the head of high ferro train and afterbody1And HIDT2, pass through height
Dynamicizer (HIDT) completes the information exchange of user and LTE base station in compartment, HIDT1And HIDT2It is responsible for down forwarding LTE
Base station is sent to the communication information of user in compartment, the information that user sends to LTE base station in forwarded upstream compartment, specific number
Comprise the following steps according to transmission optimization process：
Step 1)：LTE base station transmission descending communication signal, i.e. LTE base station->HIDT signals, now HIDT1And HIDT2Receiving should
Signal；
Step 2)：HIDT1And HIDT2The signal to noise ratio snr of its reception signal is calculated respectively1And SNR2, and by result of calculation send to
Signal controller；
Step 3)：Signal controller is according to SNR1And SNR2Value judged, select suitable high dynamic commutator end conduct
Uplink communication links, signal handoff threshold are T, and specific data transfer criterion is as follows：
If previous moment utilizes HIDT2Terminal carries out signal transmitting as uplink communication terminal and sends uplink communication signal, i.e.,
HIDT->LTE base station signal, then
If SNR1＞ SNR2+ T, switch switching utilize HIDT1As uplink communication terminal, while cut off HIDT2Uplink communication
Function；
If SNR1＜ SNR2+ T, then transmission signal still select HIDT2Terminal is as uplink communication terminal；
Step 4)：Utilize HIDT1Or HIDT2Uplink communication signal is sent to LTE base station, completes once complete communication process.
2. the data transfer optimization method in high-speed railway communication private network according to claim 1, it is characterised in that described
The usual values of signal handoff threshold T be about 3~6dB.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082598A (en) * | 2010-12-29 | 2011-06-01 | 西南交通大学 | Double-relay wireless communication system diversity method |
| CN203827347U (en) * | 2014-04-22 | 2014-09-10 | 上海交通大学 | Distributed antenna communication system for high speed vehicle |
| CN104053201A (en) * | 2014-07-07 | 2014-09-17 | 北京邮电大学 | Main relay and backup relay switching method for high-speed railway |
| CN105871448A (en) * | 2016-03-30 | 2016-08-17 | 中科凯普（天津）卫星导航通信技术有限公司 | High-dynamic transformation method of broadband special network of high-speed rail |
-
2017
- 2017-04-05 CN CN201710216966.2A patent/CN107659972A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082598A (en) * | 2010-12-29 | 2011-06-01 | 西南交通大学 | Double-relay wireless communication system diversity method |
| CN203827347U (en) * | 2014-04-22 | 2014-09-10 | 上海交通大学 | Distributed antenna communication system for high speed vehicle |
| CN104053201A (en) * | 2014-07-07 | 2014-09-17 | 北京邮电大学 | Main relay and backup relay switching method for high-speed railway |
| CN105871448A (en) * | 2016-03-30 | 2016-08-17 | 中科凯普（天津）卫星导航通信技术有限公司 | High-dynamic transformation method of broadband special network of high-speed rail |
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Application publication date: 20180202 |