CN106304155B - A kind of transmission power adjustment method and device - Google Patents
A kind of transmission power adjustment method and device Download PDFInfo
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- CN106304155B CN106304155B CN201610957264.5A CN201610957264A CN106304155B CN 106304155 B CN106304155 B CN 106304155B CN 201610957264 A CN201610957264 A CN 201610957264A CN 106304155 B CN106304155 B CN 106304155B
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- trackside
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- transmission power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
Abstract
The embodiment of the invention provides a kind of transmission power adjustment method and device, this method is applied to vehicle-mounted AP, comprising: receives the message that trackside AP is sent；In the trackside AP that the trackside AP is primary link, and when carrying label information in the message, judge whether the signal strength of the vehicle-mounted AP of the trackside AP obtained monitoring is greater than preset threshold, wherein the label information is located in predeterminable area for characterizing the trackside AP；If so, being adjusted according to preset power adjustment strategy to the transmission power of the vehicle-mounted AP, and message is sent to the trackside AP according to transmission power adjusted.Through the embodiment of the present invention, the co-channel interference in multi-field model scape can be reduced, communication quality is improved.
Description
Technical field
The present invention relates to network communication technology fields, more particularly to a kind of transmission power adjustment method and a kind of transmitting function
Rate adjusts device.
Background technique
With the fast development of network technology, wireless mesh network (Mesh Network) technology is provided to access point
(Access Point, AP) ambulant support, become the rail traffics communication technology such as subway, motor-car one are big main
Power.
In Mesh networking, as long as configuration allows and the intensity of wireless signal is appropriate, AP ON TRAINS is disposed (referred to as
Vehicle-mounted AP) Mesh link (Link) can be established with the AP (referred to as trackside AP) being deployed in by train rail.It is this to establish link
Mode there are certain randomness.In order to ensure communication quality, existing train Mesh implementation method is usually established a plurality of
Mesh link, periodically detects the quality condition of each Mesh link, select always wherein top-quality Mesh link as
Primary link undertakes the communication between trackside AP and vehicle-mounted AP, to achieve the purpose that consistent link quality, so as to meet column
Vehicle communication requirement on the move.
Specifically, being expert in the scape of parking lot, minimum between two vehicle of front and back there are also the peaces that a train body length adds tens meters
Full braking distance, even if at most also only having four vehicles that can be parked in the same area, that is, same sky in the region of turnout stop line
Interior train negligible amounts.But in the multi-field models scape such as garage, tens trains can be parked in the same narrow sky
In, at this point, if train power-up or starts inspection simultaneously, the vehicle-mounted AP being deployed on each train while radio-frequency information is sent,
Co-channel interference between each train can be extremely serious.
Summary of the invention
In view of the above problems, the embodiment of the present invention provides a kind of transmission power adjustment method and a kind of corresponding transmission power
Device is adjusted, to reduce the co-channel interference in existing multi-field model scape, improves communication quality.
To solve the above-mentioned problems, the embodiment of the invention discloses a kind of transmission power adjustment method, this method is applied to
Vehicle-mounted AP, comprising:
Receive the message that trackside AP is sent；
When being the trackside AP of primary link in the trackside AP, and carrying label information in the message, acquisition is judged
Whether the signal strength of the vehicle-mounted AP of the trackside AP monitoring is greater than preset threshold, wherein the label information is used for table
The trackside AP is levied to be located in predeterminable area；
If so, being adjusted to the transmission power of the vehicle-mounted AP, and according to preset power adjustment strategy according to adjustment
Transmission power afterwards sends message to the trackside AP.
The embodiment of the invention also discloses a kind of transmit power adjustment means, which is applied to vehicle-mounted AP, comprising:
Message receiving module, for receiving the message of trackside AP transmission；
Judgment module for being the trackside AP of primary link in the trackside AP, and carries label information in the message
When, judge whether the signal strength of the vehicle-mounted AP of the trackside AP obtained monitoring is greater than preset threshold, wherein the mark
Label information is located in predeterminable area for characterizing the trackside AP；
Power regulation module is right according to preset power adjustment strategy if being greater than preset threshold for the signal strength
The transmission power of the vehicle-mounted AP is adjusted；
Message sending module, for sending message to the trackside AP according to transmission power adjusted.
The embodiment of the present invention includes following advantages:
The embodiment of the present invention, can be by these multi-field model scene areas for multi-field models scapes such as garage, rolling stock sections
Label information is added in message transmitted by interior trackside AP, so that connecing with the trackside AP vehicle-mounted AP for establishing primary link
When receiving the message for carrying the label information, it can be determined that whether the signal strength of the vehicle-mounted AP of the trackside AP monitoring of acquisition is big
In preset threshold, wherein label information is located in predeterminable area for characterizing trackside AP, if so, according to preset power
Adjustable strategies are adjusted the transmission power of vehicle-mounted AP, and send message to trackside AP according to transmission power adjusted, into
And the co-channel interference in multi-field model scape can be reduced, improve communication quality.
Detailed description of the invention
Fig. 1 is a kind of step flow chart of transmission power adjustment method embodiment of the invention；
Fig. 2 is the step flow chart interacted between trackside AP and vehicle-mounted AP in specific example of the present invention；
Fig. 3 A is a kind of structural block diagram of transmit power adjustment means embodiment of the invention；
Fig. 3 B is a kind of structural block diagram of transmit power adjustment means alternative embodiment of the invention；
Fig. 4 is a kind of structural block diagram of transmission power adjustment system embodiment of the invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Currently, the Mesh technical application development on subway is very rapid.In rail traffic, the train based on the communication technology
Control system (Communication Based Train Control System, CBTC) and passenger information system
(Passenger Information System, PIS) is the main application of two classes.Wherein, CBTC is used for Train Control；PIS
It is the system of a kind of offer monitoring, the application functions such as video for train video, monitoring application.As it can be seen that this two systems is all
The support of communication system is needed, to carry out timely and effectively car-ground data communication, synchronization, that is, needs data communication system
The support of system (Data Communication System, DCS).
In general, the quantity of vehicle is more in the multi-field models scape such as garage, rolling stock section, such as twenties or more trains
It is parked in same storehouse, i.e. the density of vehicle is big.Therefore, it when train is powered on inspection or starts simultaneously, is deployed on each train
If vehicle-mounted AP send radiofrequency signal, the problem of being easy to appear co-channel interference according to the transmission power of driving scene.
One of the core concepts of the embodiments of the present invention is, for the multi-field models scape such as garage, rolling stock section, by this
Label information is added in message transmitted by trackside AP in a little multi-field model scene areas, so that establishing main chain with trackside AP
The vehicle-mounted AP on road is when receiving the message for carrying the label information, it can be determined that the vehicle-mounted AP's of the trackside AP monitoring of acquisition
Whether signal strength is greater than preset threshold, wherein and label information is located in predeterminable area for characterizing trackside AP, if so,
According to preset power adjustment strategy, the transmission power of vehicle-mounted AP is adjusted, and according to transmission power adjusted to institute
It states trackside AP and sends message, and then reduce the co-channel interference in multi-field model scape, improve communication quality.
Referring to Fig.1, a kind of step flow chart of transmission power adjustment method embodiment of the invention is shown, this method is answered
For vehicle-mounted AP, it can specifically include following steps:
Step 102, the message that trackside AP is sent is received.
The embodiment of the present invention can be using application scenarios locating for trackside AP as feature scene, and this feature scene specifically can be with
Including the multi-field models scape such as garage, rolling stock section；And can in advance be located at these feature scene region in trackside AP
In be characterized the corresponding label information of scene configuration, allow trackside AP to send the message for carrying label information.Wherein, should
Label information can be used for characterizing trackside AP and is located in predeterminable area, specifically include feature scene label, information type, occupancy
The parameter informations such as byte length.
Step 104, when being the trackside AP of primary link in the trackside AP, and carrying label information in the message, sentence
Whether the signal strength of the vehicle-mounted AP of the disconnected trackside AP monitoring obtained is greater than preset threshold.
In the concrete realization, when the Mesh link that trackside AP and vehicle-mounted AP is established is primary link, if vehicle-mounted AP is logical
It crosses and parses the Receive message to label information, then illustrate that trackside AP is the trackside AP in predeterminable area, need to pass through rail
The size of the signal strength of itself of other AP monitoring carrys out the transmission power whether decision needs to adjust itself.That is, it is judged that once should
Whether the signal strength of itself of trackside AP monitoring is greater than preset threshold (can be strong according to signal required for practical application scene
Degree is configured), it in the case where the judgment result is yes, can determine the transmission power for needing to adjust vehicle-mounted AP, execute step
106, to reduce the signal strength of itself of trackside AP monitoring, reduce co-channel interference；If the determination result is NO, may be used
To determine the transmission power without adjusting vehicle-mounted AP, i.e., vehicle-mounted AP can send to trackside AP according to current transmission power and report
Text.Wherein, which can obtain from the message (that is, trackside AP carries the signal strength of the vehicle-mounted AP of monitoring
In the message, same field can be located at label information, can also be located in different fields)；The report can also received
Wen Hou obtains the signal strength from the side trackside AP, the embodiment of the present invention does not limit this specifically by the interaction with trackside AP
System.
Step 106, if so, according to preset power adjustment strategy, the transmission power of the vehicle-mounted AP is adjusted, and
Message is sent to the trackside AP according to transmission power adjusted.
In the embodiment of the present invention, the power adjustment strategy of vehicle-mounted AP is preset, thus in the vehicle-mounted AP of trackside AP monitoring
Signal strength be greater than preset threshold when, vehicle-mounted AP can adjust the transmission power of vehicle-mounted AP according to the power adjustment strategy
It is whole, to reduce the co-channel interference in multi-field model scape.
In the concrete realization, predetermined power threshold value can be configured, in preset power adjustment strategy to limit vehicle-mounted AP
The transmission power of message is sent to the trackside AP for being located at predeterminable area in such as multi-field model scape.In an optional reality of the invention
It applies in example, according to preset power adjustment strategy, the transmission power of the vehicle-mounted AP is adjusted, can specifically include: will
The current transmission power of the vehicle-mounted AP reduces predetermined power threshold value, the transmission power after being reduced.
As a specific example of the invention, can in preset power adjustment strategy label allocation information it is corresponding
Predetermined power threshold value, to can determine the label by inquiring the predetermined power adjustable strategies when getting label information
The corresponding predetermined power threshold value of information, also that is, determining corresponding predetermined power threshold value in the region that trackside AP belongs to, Jin Erke
To be adjusted according to transmission power of the predetermined power threshold value to vehicle-mounted AP, to reduce co-channel interference, communication quality is improved.Example
Such as, current transmission power can be adjusted to predetermined power threshold value by vehicle-mounted AP, with according to transmission power adjusted to being located at
Trackside AP in predeterminable area sends message.
It should be noted that the embodiment of the present invention can also adjust the transmission power of vehicle-mounted AP using other modes
Whole, the signal strength for the vehicle-mounted AP that can such as monitor trackside AP is added in message, so that vehicle-mounted AP can pass through
The message that trackside AP is sent is detected, obtains signal strength entrained by the message, and based on obtained signal strength to transmitting
Power is adjusted, and the embodiment of the present invention does not limit this specifically.
In the embodiment of the present invention, it can be configured in the power adjustment strategy of vehicle-mounted AP in advance and be located at trackside in predeterminable area
AP monitors the corresponding preset threshold of the signal strength of vehicle-mounted AP, and the signal for the vehicle-mounted AP that trackside AP can be monitored is strong
Degree is added to trackside AP and is sent in the message of vehicle-mounted AP, so that vehicle-mounted AP signal strength entrained by the message is greater than
Transmission power can be lowered when preset threshold, until trackside AP monitoring vehicle-mounted AP signal strength be no more than preset threshold, from
And the co-channel interference in multi-field model scape is reduced, improve communication quality.
In another alternative embodiment of the invention, according to preset power adjustment strategy, to the hair of the vehicle-mounted AP
It penetrates power to be adjusted, specifically include: the current transmission power of the vehicle-mounted AP is adjusted to the corresponding function of the preset threshold
Below rate threshold value.Specifically, detecting that being located at trackside AP in predeterminable area monitors the signal strength of vehicle-mounted AP greater than default
When threshold value, it can be based on preset power adjustment strategy, it is corresponding that the current transmission power of the vehicle-mounted AP is adjusted to preset threshold
Power threshold hereinafter, so that trackside AP monitoring vehicle-mounted AP signal strength be no more than preset threshold.
Optionally, vehicle-mounted AP is when sending keep alive Packet to the trackside AP according to transmission power adjusted, Ke Yiyan
The keep-alive time of the long vehicle-mounted AP and trackside AP, under the premise of guarantee will not cause communication quality problem, to a certain degree
The upper look-in frequency for reducing keep-alive detection, to save Internet resources.
Optionally, in embodiments of the present invention, it is the trackside AP of primary link in trackside AP, and carries mark in the message
When signing information, server can be notified only to send specified type message, to reduce the transmission of unnecessary message, eat dishes without rice or wine to provide to save
Source.
On the basis of the above embodiments, the present invention is carried out below in conjunction with the interaction between trackside AP and vehicle-mounted AP detailed
It is thin to discuss.
Referring to Fig. 2, the step flow chart interacted between trackside AP and vehicle-mounted AP in specific example of the present invention is shown, specifically
It may include steps of:
Step 202, trackside AP obtains the corresponding label information of feature scene, generates the message for carrying label information.
In a preferred embodiment of the invention, trackside AP obtains the corresponding label information of feature scene, generates and carries
The message of label information, can specifically include: obtaining the feature scene and corresponds to preset feature scene label, generates feature mark
Sign information；The feature tag information is added in message, the message for carrying label information is generated.
As a concrete application of the invention, the trackside AP in the scene areas such as garage, rolling stock section can pass through
The application scenarios being presently in are marked in configuration means, using the application scenarios being presently in as feature scene, and can
Think the corresponding feature scene label of this feature scene configuration, for example itself stamps the label in " garage ".Therefore, trackside AP is being sent out
Before sending protocol massages, available feature scene corresponds to preset feature scene label, to feature scene label obtained
It is packaged, generates label information.For example, trackside AP can be added " garage " label by custom field vendor TLV
To beacon (beacon), detection (probe), management agreement message (such as peer link open/confirm) agreement report
Wen Zhong generates features protocol message.Wherein, the English that TLV is Type Length Value is write a Chinese character in simplified form, and T can indicate info class
Type specifically can be used for identifying the information content entrained by custom field vendor；L can indicate custom field
The range of vendor, if vendor TLV occupies 2 bytes, the data area of Length can be from 2 to 255；V can be used for table
Show content entrained by label information, may include feature tag, such as " garage " label.
In a preferred embodiment of the invention, after trackside AP and vehicle-mounted AP establish communication link, trackside AP may be used also
To monitor the signal strength of vehicle-mounted AP, the signal strength monitored is added in the above protocol massages (that is, signal strength and institute
State feature tag information and be respectively positioned on vendor field) it can be according to the signal strength tune in protocol massages so that vehicle-mounted AP is subsequent
Whole transmission power.
Step 204, the message for carrying label information is sent to vehicle-mounted AP by trackside AP.
Step 206, vehicle-mounted AP receives message transmitted by trackside AP, and parses to the message received.
In a specific example of the invention, after vehicle-mounted AP parses the message received, if it find that should
When the trackside AP for carrying label information in message, and sending the message is the trackside AP of primary link, illustrate that trackside AP is
Trackside AP in predeterminable area can obtain the signal strength (letter of the vehicle-mounted AP of trackside AP monitoring from the message
Number intensity), to judge whether the signal strength is greater than preset threshold, in order to which whether decision needs to adjust transmission power out.
Step 208, when the signal strength of the vehicle-mounted AP of trackside AP monitoring is greater than preset threshold, vehicle-mounted AP is according to pre-
If power adjustment strategy, the transmission power of the vehicle-mounted AP is adjusted.
Optionally, vehicle-mounted AP can determine this feature after obtaining feature scene label in the label information that message carries
The corresponding feature scene of scene tag, and then the signal in the region of this feature scene can be obtained from predetermined power adjustable strategies
Preset threshold corresponding to intensity, and judge whether signal strength is greater than preset threshold in the message.If the determination result is YES, then
It can be adjusted according to transmission power of the power adjustment strategy to vehicle-mounted AP.
For example, vehicle-mounted AP is when getting label information, can based on " garage " label entrained by the label information from
The transmission power of dynamic adjustment itself e.g., can be with so as to which transmission power is adjusted to transmission power required for garage scene
The transmission power of vehicle-mounted AP is adjusted to predetermined power threshold value, the transmission power of vehicle-mounted AP can also be reduced into predetermined power threshold
The transmission power of vehicle-mounted AP, it is such as the following can also to be adjusted to the corresponding power threshold of preset threshold by value.Wherein, predetermined power threshold
Value can be configured according to transmission power required for application scenarios, such as be set as 35 decibels (Db), the present invention is to default function
The value of rate threshold value is not specifically limited.
Step 210, vehicle-mounted AP sends message to trackside AP according to transmission power adjusted.
In a preferred embodiment of the invention, in the trackside AP that the trackside AP is primary link, and trackside AP is sent out
When carrying label information in the message sent, vehicle-mounted AP can also notify server only to send specified type message.
In the embodiment of the present invention, vehicle-mounted AP carries label information in the message for detecting that the trackside AP in primary link is sent
When, server can be notified only to send specified type message, it, such as can be by all also i.e., it is possible to only retain basic data communication
Such as means such as Simple Network Management Protocols (Simple Network Management Protocol, SNMP), upper layer clothes are notified
Business device enters suspend mode, sends to reduce unnecessary data, to save interface-free resources.Wherein, it is not necessary to data tool
Body may include vod data etc..
Certainly, vehicle-mounted AP in the primary link that discovery currently connects itself is such as being received in garage scene
When extracting in message less than label information, transmission power (for example, transmission power is made to be restored to some power threshold) can be adjusted back,
And top service device is notified normally to send message to guarantee the communication quality in normally driving scene.
To sum up, the embodiment of the present invention can be generated and be carried by adding label information in the message transmitted by trackside AP
The message of label information, so that receiving the message for carrying label information with the trackside AP vehicle-mounted AP for establishing Mesh primary link
When, it can determine that trackside AP is located in predeterminable area according to the label information, and the trackside AP that can be obtained by judgement is supervised
Whether the signal strength of the vehicle-mounted AP surveyed is greater than preset threshold to determine the need for adjusting the transmitting function of the vehicle-mounted AP itself
Rate is mentioned with sending message to trackside AP according to transmission power adjusted so as to reduce the co-channel interference in multi-field model scape
High communication quality.
It should be noted that for simple description, therefore, it is stated as a series of action groups for embodiment of the method
It closes, but those skilled in the art should understand that, embodiment of that present invention are not limited by the describe sequence of actions, because according to
According to the embodiment of the present invention, some steps may be performed in other sequences or simultaneously.Secondly, those skilled in the art also should
Know, the embodiments described in the specification are all preferred embodiments, and the related movement not necessarily present invention is implemented
Necessary to example.
Referring to Fig. 3 A, a kind of structural block diagram of transmit power adjustment means embodiment of the invention is shown.The present invention is real
The transmit power adjustment means for applying example offer can be applied in vehicle-mounted AP, can specifically include following module:
Message receiving module 302, for receiving the message of trackside AP transmission.
Judgment module 304 for being the trackside AP of primary link in the trackside AP, and carries label letter in the message
When breath, judge whether the signal strength of the vehicle-mounted AP of the trackside AP obtained monitoring is greater than preset threshold, wherein described
Label information is located in predeterminable area for characterizing the trackside AP.
Power regulation module 306, if being greater than preset threshold for the signal strength, according to preset power adjustment plan
Slightly, the transmission power of the vehicle-mounted AP is adjusted.
Message sending module 308, for sending message to the trackside AP according to transmission power adjusted.
Referring to Fig. 3 B, a kind of structural block diagram of transmit power adjustment means alternative embodiment of the invention is shown.
Optionally, which can also include: notification module 310.The notification module 310 can be used for
When being the trackside AP of primary link in the trackside AP, and carrying label information in the message, notice server, which is only sent, to be referred to
Determine type message.
In a preferred embodiment of the invention, power regulation module 306 specifically can be used for the vehicle-mounted AP's
Current transmission power reduces predetermined power threshold value, the transmission power after being reduced.
In another preferred embodiment of the invention, power regulation module 306 specifically can be used for the vehicle-mounted AP
Current transmission power be adjusted to the corresponding power threshold of the preset threshold or less.
In a preferred embodiment of the invention, message sending module 308 specifically can be used for according to hair adjusted
When penetrating power and sending keep alive Packet to the trackside AP, extend the keep-alive time of the vehicle-mounted AP and the trackside AP.
Referring to Fig. 4, a kind of structural block diagram of transmission power adjustment system embodiment of the invention is shown.
It may include: vehicle-mounted AP 402 and trackside AP404 that the transmission power, which adjusts system,.Wherein, vehicle-mounted AP 402 can be with
For executing step performed by trackside AP in above method embodiment, each mould in above-mentioned apparatus embodiment can specifically include
Block.Trackside AP 404 can be used for executing step performed by trackside AP in above method embodiment.
For device and system embodiment, since it is basically similar to the method embodiment, so the comparison of description is simple
Single, the relevent part can refer to the partial explaination of embodiments of method.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.
It should be understood by those skilled in the art that, the embodiment of the embodiment of the present invention can provide as method, apparatus or calculate
Machine program product.Therefore, the embodiment of the present invention can be used complete hardware embodiment, complete software embodiment or combine software and
The form of the embodiment of hardware aspect.Moreover, the embodiment of the present invention can be used one or more wherein include computer can
With in the computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) of program code
The form of the computer program product of implementation.
The embodiment of the present invention be referring to according to the method for the embodiment of the present invention, terminal device (system) and computer program
The flowchart and/or the block diagram of product describes.It should be understood that flowchart and/or the block diagram can be realized by computer program instructions
In each flow and/or block and flowchart and/or the block diagram in process and/or box combination.It can provide these
Computer program instructions are set to general purpose computer, special purpose computer, Embedded Processor or other programmable data processing terminals
Standby processor is to generate a machine, so that being held by the processor of computer or other programmable data processing terminal devices
Capable instruction generates for realizing in one or more flows of the flowchart and/or one or more blocks of the block diagram
The device of specified function.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing terminal devices
In computer-readable memory operate in a specific manner, so that instruction stored in the computer readable memory generates packet
The manufacture of command device is included, which realizes in one side of one or more flows of the flowchart and/or block diagram
The function of being specified in frame or multiple boxes.
These computer program instructions can also be loaded into computer or other programmable data processing terminal devices, so that
Series of operation steps are executed on computer or other programmable terminal equipments to generate computer implemented processing, thus
The instruction executed on computer or other programmable terminal equipments is provided for realizing in one or more flows of the flowchart
And/or in one or more blocks of the block diagram specify function the step of.
Although the preferred embodiment of the embodiment of the present invention has been described, once a person skilled in the art knows bases
This creative concept, then additional changes and modifications can be made to these embodiments.So the following claims are intended to be interpreted as
Including preferred embodiment and fall into all change and modification of range of embodiment of the invention.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or terminal device including a series of elements not only wrap
Those elements are included, but also including other elements that are not explicitly listed, or further includes for this process, method, article
Or the element that terminal device is intrinsic.In the absence of more restrictions, being wanted by what sentence "including a ..." limited
Element, it is not excluded that there is also other identical elements in process, method, article or the terminal device for including the element.
Above to a kind of transmission power adjustment method provided by the present invention and a kind of transmit power adjustment means, carry out
It is discussed in detail, used herein a specific example illustrates the principle and implementation of the invention, above embodiments
Illustrate to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, according to
According to thought of the invention, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification
It should not be construed as limiting the invention.
Claims (6)
1. a kind of transmission power adjustment method, which is characterized in that the method is applied to vehicle-mounted access point AP, the method packet
It includes:
Receive the message that trackside AP is sent；
When being the trackside AP of primary link in the trackside AP, and carrying label information in the message, judge to obtain described
Whether the signal strength of the vehicle-mounted AP of trackside AP monitoring is greater than preset threshold, wherein the label information is for characterizing institute
Trackside AP is stated to be located in predeterminable area；
If so, being adjusted to the transmission power of the vehicle-mounted AP, and according to preset power adjustment strategy according to adjusted
Transmission power sends message to the trackside AP；
It is described according to preset power adjustment strategy, the transmission power of the vehicle-mounted AP is adjusted, is specifically included:
The current transmission power of the vehicle-mounted AP is reduced into predetermined power threshold value, the transmission power after being reduced；
Alternatively, it is described according to preset power adjustment strategy, the transmission power of the vehicle-mounted AP is adjusted, is specifically included:
The current transmission power of the vehicle-mounted AP is adjusted to the corresponding power threshold of the preset threshold or less.
2. the method according to claim 1, wherein it is described according to transmission power adjusted to the trackside AP
Message is sent, is specifically included:
When sending keep alive Packet to the trackside AP according to transmission power adjusted, extend the vehicle-mounted AP and trackside AP
The keep-alive time.
3. the method according to claim 1, wherein further include:
When being the trackside AP of primary link in the trackside AP, and carrying label information in the message, notice server is only sent out
Send specified type message.
4. a kind of transmit power adjustment means, which is characterized in that described device is applied to vehicle-mounted access point AP, described device packet
It includes:
Message receiving module, for receiving the message of trackside AP transmission；
Judgment module is sentenced in the trackside AP that the trackside AP is primary link, and when carrying label information in the message
Whether the signal strength of the vehicle-mounted AP of the disconnected trackside AP monitoring obtained is greater than preset threshold, wherein the label letter
Breath is located in predeterminable area for characterizing the trackside AP；
Power regulation module, if being greater than preset threshold for the signal strength, according to preset power adjustment strategy, to described
The transmission power of vehicle-mounted AP is adjusted；
Message sending module, for sending message to the trackside AP according to transmission power adjusted；
The power regulation module is obtained specifically for the current transmission power of the vehicle-mounted AP is reduced predetermined power threshold value
Transmission power after reduction；
Alternatively, the power regulation module, specifically for the current transmission power of the vehicle-mounted AP is adjusted to the default threshold
It is worth corresponding power threshold or less.
5. device according to claim 4, which is characterized in that the message sending module, after being specifically used for according to adjustment
Transmission power when sending keep alive Packet to the trackside AP, extend the keep-alive time of the vehicle-mounted AP and the trackside AP.
6. device according to claim 5, which is characterized in that further include:
Notification module leads in the trackside AP that the trackside AP is primary link, and when carrying label information in the message
Know that server only sends specified type message.
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| CN105704740A (en) * | 2015-06-29 | 2016-06-22 | 南方银谷科技有限公司 | Train vehicle-ground communication network system |
| CN105992256A (en) * | 2015-03-03 | 2016-10-05 | 华为技术有限公司 | Method and device for managing channels of wireless local area network in rail transit, and system of same |
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| CN105992256A (en) * | 2015-03-03 | 2016-10-05 | 华为技术有限公司 | Method and device for managing channels of wireless local area network in rail transit, and system of same |
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