CN103731890A - Link switching method under high-speed motion state, vehicle-mounted AP and system - Google Patents
Link switching method under high-speed motion state, vehicle-mounted AP and system Download PDFInfo
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- CN103731890A CN103731890A CN201310675028.0A CN201310675028A CN103731890A CN 103731890 A CN103731890 A CN 103731890A CN 201310675028 A CN201310675028 A CN 201310675028A CN 103731890 A CN103731890 A CN 103731890A
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Abstract
The embodiment of the invention provides a link switching method under a high-speed motion state, a vehicle-mounted AP and a system. Signal strength of a trackside AP is obtained, wherein the signal strength of the trackside AP is monitored by the vehicle-mounted AP according to a preset monitoring rule; whether a main trackside AP which sets up bridging with the vehicle-mounted AP meets the following conditions at the same time or not is judged and the following conditions are that the signal strength of the main trackside AP is less than a preset switching threshold value; the signal strength of the main trackside AP is less than that of a standby trackside AP of the vehicle-mounted AP; the signal strength difference between the main trackside AP and the standby trackside AP is larger than the preset difference threshold value; if the conditions are met, the standby trackside AP is updated to be the main trackside AP, and the vehicle-mounted AP sets up bridging with the updated main trackside AP. The problem of data packet dropout caused by frequent link switching in the prior art is solved. The link switching method under the high-speed motion state relates to the technical field of network communication.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to link switch-over method under high-speed motion state, vehicle-mounted AP and system.
Background technology
Along with the development of wireless communication technology, wireless network is ubiquitous, even for example, in the environment of comparatively sealing: subway.In prior art, in subway carriage, also can have wireless network, the network system of subway can comprise the outer part of vehicle-mounted part and car, and Fig. 1 a-Fig. 1 b is the network connection diagram of a certain subway carriage while travelling in tunnel.Be provided with vehicle-mounted access point (AP, Access Point) certain subway carriage travels in tunnel, in tunnel, at interval of predeterminable range, be provided with trackside AP, vehicle-mounted AP can be connected with trackside AP, for the terminal in subway carriage, by vehicle-mounted AP, carry out radio communication.
Vehicle-mounted AP can, according to the signal strength signal intensity of each trackside AP, select the trackside AP that one of them signal is the strongest to set up link.Because subway carriage is being run at high speed, and trackside AP maintains static, this just makes the signal strength signal intensity of each trackside AP that the vehicle-mounted AP on subway carriage perceives constantly change, in order to guarantee that the terminal in subway carriage keeps network unimpeded, vehicle-mounted AP on subway carriage need to be at different trackside AP internetwork roamings, that is to say, vehicle-mounted AP needs constantly to survey the signal strength signal intensity of trackside AP around, when vehicle-mounted AP detection to the signal strength signal intensity of trackside AP be greater than while having set up the signal strength signal intensity of trackside AP of link with vehicle-mounted AP, disconnect the link of having set up, and set up link with the stronger trackside AP of the signal strength signal intensity detecting.
As shown in Figure 1a, subway carriage drives towards trackside AP3 position from trackside AP1 position, when the signal strength signal intensity that trackside AP2 detected as vehicle-mounted AP is greater than the signal strength signal intensity of the trackside AP1 that has set up link with self, link between disconnection and trackside AP1, AP2 sets up link with trackside, along with subway carriage away from trackside AP2 near trackside AP3, the signal of trackside AP3 is more and more stronger, link between the final disconnection of vehicle-mounted AP and trackside AP2, AP3 sets up link with trackside.
In prior art, the signal strength signal intensity of the trackside AP detecting as vehicle-mounted AP is greater than while having set up the signal strength signal intensity of trackside AP of link with this vehicle-mounted AP, just set up link with the stronger trackside AP of signal strength signal intensity, but, as shown in Figure 1 b, adjacent two trackside AP(are for example: trackside AP2 and trackside AP3) overlay area between there is overlapping overlay area, in this overlapping overlay area, the signal of adjacent two trackside AP can interfere with each other, the magnitude relationship that makes the signal strength signal intensity of adjacent two trackside AP is not certain, that is to say, when subway carriage drives to this overlapping overlay area, the signal strength signal intensity that may first detect trackside AP3 is greater than the signal strength signal intensity of trackside AP2, link between vehicle-mounted AP disconnection and trackside AP2, after setting up link with trackside AP3, the signal strength signal intensity that may detect again trackside AP2 is greater than the signal strength signal intensity of trackside AP3, vehicle-mounted AP disconnect again and trackside AP3 between link, and connect with trackside AP2, link switching can cause signal concussion so frequently, unstable networks, and data-bag lost.
Summary of the invention
The embodiment of the present invention provides link switch-over method under high-speed motion state, vehicle-mounted AP and system, in order to solve frequent ground chain road in prior art, switches the problem that causes data-bag lost.
Based on the problems referred to above, link switch-over method under a kind of high-speed motion state that the embodiment of the present invention provides, comprising:
Obtain the signal strength signal intensity of the trackside AP that vehicle-mounted AP listens to according to default monitoring rule;
Whether judgement meets following condition with the other AP of backbone that described vehicle-mounted AP has set up bridge joint simultaneously:
The signal strength signal intensity of the other AP of described backbone is less than default switching threshold; And
The signal strength difference of signal strength signal intensity that the signal strength signal intensity of the other AP of described backbone is less than the other AP of emergency rail stored along the way of described vehicle-mounted AP is greater than preset difference value threshold value;
If meet, the other AP of described emergency rail stored along the way is updated to the other AP of backbone, and the other AP of the backbone after described vehicle-mounted AP and renewal sets up bridge joint, wherein, by described emergency rail stored along the way, AP is when by described vehicle-mounted AP and described backbone, AP sets up bridge joint, in each AP except the other AP of described backbone that described vehicle-mounted AP listens to, the AP that signal strength signal intensity is the strongest.
A kind of vehicle-mounted AP that the embodiment of the present invention provides, comprising:
Monitor module, for the signal strength signal intensity of the trackside access point AP that listens to according to default monitoring rule;
Judge module, for judge whether the other AP of backbone that has set up bridge joint with described vehicle-mounted AP meets following condition simultaneously: the signal strength signal intensity of the other AP of described backbone is less than default switching threshold; And the signal strength difference of signal strength signal intensity that the signal strength signal intensity of the other AP of described backbone is less than the other AP of emergency rail stored along the way of described vehicle-mounted AP is greater than preset difference value threshold value; ;
Handover module, if described judge module is judged described backbone, other AP meets above-mentioned condition, the other AP of described emergency rail stored along the way is updated to the other AP of backbone, and the other AP of the backbone after described vehicle-mounted AP and renewal sets up bridge joint, wherein, by described emergency rail stored along the way, AP is when by described vehicle-mounted AP and described backbone, AP sets up bridge joint, in each AP except the other AP of described backbone that described vehicle-mounted AP listens to, and the AP that signal strength signal intensity is the strongest.
Link switching system under a kind of high-speed motion state that the embodiment of the present invention provides, comprising: above-mentioned vehicle-mounted AP and vehicle-mounted switch;
Described vehicle-mounted switch, for according to the default rule of surveying, surveys the connectedness of the main communication link communicating by described vehicle-mounted AP; When definite described main communication link breaks down, switch to the spare communication link communicating by other vehicle-mounted switching equipment and carry out transfer of data, wherein, described other vehicle-mounted switching equipment are the vehicle-mounted switching equipment in other compartments except compartment, described vehicle-mounted switching equipment place.
The beneficial effect of the embodiment of the present invention comprises:
Link switch-over method, vehicle-mounted AP and system under the high-speed motion state that the embodiment of the present invention provides, obtain the signal strength signal intensity of the trackside AP that vehicle-mounted access point AP listens to according to default monitoring rule; Whether judgement meets following condition with the other AP of backbone that described vehicle-mounted AP has set up bridge joint simultaneously: the signal strength signal intensity of the other AP of described backbone is less than default switching threshold; The signal strength signal intensity of the other AP of described backbone is less than the signal strength signal intensity of the other AP of emergency rail stored along the way of described vehicle-mounted AP; Signal strength difference between the other AP of described backbone and the other AP of emergency rail stored along the way is greater than preset difference value threshold value; If meet, the other AP of described emergency rail stored along the way is updated to the other AP of backbone, and the other AP of the backbone after described vehicle-mounted AP and renewal sets up bridge joint, wherein, by described emergency rail stored along the way, AP is when by described vehicle-mounted AP and described backbone, AP sets up bridge joint, in each AP except the other AP of described backbone that described vehicle-mounted AP listens to, the AP that signal strength signal intensity is the strongest.Before determining and need to upgrading the other AP of backbone, first judge whether the other AP of backbone meets a plurality of conditions, for the signal strength signal intensity of the other AP of backbone, be less than the condition of default switching threshold, when the signal strength signal intensity of the other AP of backbone is not less than default switching threshold, do not carry out the switching of the other AP of backbone, in the situation that the signal strength signal intensity of the other AP of current backbone does not affect use, avoided the switching of the other AP of backbone; The signal strength difference of signal strength signal intensity that is less than the other AP of emergency rail stored along the way of vehicle-mounted AP for the signal strength signal intensity of the other AP of backbone is greater than the condition of preset difference value threshold value, by backbone, the signal strength signal intensity of AP is less than the signal strength signal intensity of the other AP of emergency rail stored along the way, and when the difference between the other AP of backbone and the other AP signal strength signal intensity of emergency rail stored along the way is not more than preset difference value threshold value, do not carry out the renewal of the other AP of backbone, further, in the situation that the signal strength signal intensity of the other AP of current backbone does not affect use, avoided the switching of the other AP of backbone; In prior art, when vehicle-mounted AP detects while existing the signal strength signal intensity of trackside AP to be greater than to have set up the signal strength signal intensity of trackside AP of link with this vehicle-mounted AP, with regard to handoff links, compare, reduced link switching number of times, thereby while having reduced link switching, signal shakes the loss that causes packet.
Accompanying drawing explanation
Network connection diagram when a certain subway carriage that Fig. 1 a-Fig. 1 b provides for background technology of the present invention travels in tunnel;
The flow chart of link switch-over method under a kind of high-speed motion state that Fig. 2 provides for the embodiment of the present invention;
The flow chart of link switch-over method under a kind of high-speed motion state that Fig. 3 provides for the embodiment of the present invention 1;
The flow chart of a kind of vehicle-mounted switching equipment link switch-over method that Fig. 4 provides for the embodiment of the present invention 2;
The compartment network system architecture schematic diagram that Fig. 5 provides for the embodiment of the present invention 2;
The structural representation of a kind of vehicle-mounted AP that Fig. 6 provides for the embodiment of the present invention.
Embodiment
The embodiment of the present invention provides link switch-over method under high-speed motion state, vehicle-mounted AP and system, below in conjunction with Figure of description, the preferred embodiments of the present invention are described, be to be understood that, preferred embodiment described herein only, for description and interpretation the present invention, is not intended to limit the present invention.And in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.
The embodiment of the present invention provides link switch-over method under a kind of high-speed motion state, as shown in Figure 2, comprising:
S201, obtain the signal strength signal intensity of the trackside AP that vehicle-mounted AP listens to according to default monitoring rule.
Whether the other AP of backbone that S202, judgement and vehicle-mounted AP have set up bridge joint meets following condition simultaneously:
The signal strength signal intensity of the other AP of backbone is less than default switching threshold; And
The signal strength difference of signal strength signal intensity that the signal strength signal intensity of the other AP of backbone is less than the other AP of emergency rail stored along the way of vehicle-mounted AP is greater than preset difference value threshold value.
If S203 meets, the other AP of emergency rail stored along the way is updated to the other AP of backbone, and the other AP of the backbone after vehicle-mounted AP and renewal sets up bridge joint.
Wherein, by emergency rail stored along the way, AP is when by vehicle-mounted AP and backbone, AP sets up bridge joint, in each AP except the other AP of backbone that vehicle-mounted AP listens to, and the AP that signal strength signal intensity is the strongest.
In this step, the other AP of emergency rail stored along the way can be for having set up the AP of virtual link with vehicle-mounted AP, that is to say, although vehicle-mounted AP does not establish the link with the other AP of emergency rail stored along the way, vehicle-mounted AP can obtain the required information that connects with the other AP of emergency rail stored along the way in advance, such as the MAC Address of the other AP of emergency rail stored along the way etc., when needs are updated to the other AP of backbone by the other AP of emergency rail stored along the way, according to the information of the other AP of the emergency rail stored along the way obtaining, other AP shakes hands with emergency rail stored along the way, connects.
Further, under a kind of high-speed motion state that the embodiment of the present invention provides, link switch-over method can be applied to the railway car of various high-speed motions.
Below in conjunction with accompanying drawing, with specific embodiment, method provided by the invention and relevant device are described in detail.
Embodiment 1:
Link switch-over method under a kind of high-speed motion state is provided in the embodiment of the present invention 1, as shown in Figure 3, has specifically comprised the steps:
S301, obtain the signal strength signal intensity of the trackside AP that vehicle-mounted AP listens to according to default monitoring rule.
In this step, default monitoring rule can arrange according to actual conditions, for example, can be set to periodically monitor, or real-time listening etc.Vehicle-mounted AP can, according to default monitoring rule, monitor listening to the signal strength signal intensity of each trackside AP of signal.
Further, the Beacon frame that vehicle-mounted AP can send by detecting each trackside AP, monitors trackside AP, according to MAC Address, the signal strength signal intensity of the trackside AP of this Beacon frame of transmission carrying in each Beacon frame, determines the information of the trackside AP listening to.
Further, vehicle-mounted AP can safeguard trackside AP list, the information of the trackside AP listening to is inserted in table, and according to the signal strength signal intensity of each trackside AP, determined the other AP of backbone and the other AP of emergency rail stored along the way.
Whether the signal strength signal intensity that S302, judgement and vehicle-mounted AP have set up the other AP of backbone of bridge joint is less than default switching threshold; If so, enter step S303; If not, enter step S308.
In this step, default switching threshold can arrange according to actual needs, conventionally can be set to not affect the signal strength signal intensity of normal use, when the signal strength signal intensity of the other AP of backbone is not less than default switching threshold, can not carry out the switching of the other AP of backbone, even if the signal strength signal intensity of the other AP of backbone is less than the signal strength signal intensity of the other AP of emergency rail stored along the way, owing to not affecting normal use, also can not switch the other AP of backbone, in the situation that the signal strength signal intensity of the other AP of current backbone does not affect use, avoided the frequent switching of the other AP of backbone.
In this step, if vehicle-mounted AP cannot listen to legal trackside AP, cannot listen to the trackside AP with authorized manufacturer number, vehicle-mounted AP cannot set up bridge joint with any one trackside AP, vehicle-mounted AP also needs trackside AP towards periphery to send probe messages, and after receiving probe response, judges whether the trackside AP of transmission probe response is legal trackside AP, if, select trackside AP that signal strength signal intensity is the strongest as the other AP of backbone, next trackside AP of signal strength signal intensity is as the other AP of emergency rail stored along the way.
S303, judge whether the signal strength signal intensity of the other AP of this backbone is less than the signal strength signal intensity of the other AP of emergency rail stored along the way of vehicle-mounted AP; If so, enter step S304; If not, enter step S308.
Whether the difference between the signal strength signal intensity of S304, the signal strength signal intensity that judges the other AP of backbone and the other AP of emergency rail stored along the way is greater than preset difference value threshold value; If so, enter step S305; If not, enter step S308.
In this step, when the signal strength signal intensity of the other AP of backbone is less than the signal strength signal intensity of the other AP of emergency rail stored along the way, directly the other AP of emergency rail stored along the way is not updated to the other AP of backbone, but further judging the difference between the signal strength signal intensity of the other AP of backbone and the signal strength signal intensity of the other AP of emergency rail stored along the way, the object of doing is like this further to avoid the frequent switching of the other AP of backbone.Can preset difference value be set according to actual conditions, make to be less than when the signal strength signal intensity of the other AP of backbone the signal strength signal intensity of the other AP of emergency rail stored along the way, and when the difference between the two signal strength signal intensity is not more than preset difference value threshold value, the signal strength signal intensity of the other AP of backbone does not still affect normal use, does not therefore consider to switch.
S305, judge whether the duration of the built vertical bridge joint of the other AP of vehicle-mounted AP and backbone is not less than the default duration that switches; If so, enter step S306; If not, enter step S308.
Further, between the overlay area of adjacent two trackside AP, there is overlapping overlay area, in this overlapping overlay area, the magnitude relationship of the signal strength signal intensity of adjacent two trackside AP is not certain, take subway carriage as example, that is to say, when subway carriage is positioned at specific position, from a trackside AP in two adjacent trackside AP enough close to, in the time of away from enough from another, the signal strength signal intensity from the trackside AP close to own that the vehicle-mounted AP of guarantee listens to, be greater than from the signal strength signal intensity of the trackside AP away from own, and the subway this magnitude relationship within a certain period of time that continues to travel can not change yet.Due to generally, the distance between every two adjacent trackside AP is identical again, can, according to the travel speed of subway, estimate that subway carriage is positioned at the moment of above-mentioned ad-hoc location.Therefore, can be according to the moment that by vehicle-mounted AP and backbone, AP sets up bridge joint, and subway drive to vehicle-mounted AP from the other AP of backbone enough away from, from the other AP of emergency rail stored along the way enough close to, switch main AP and can not cause moment of the position of signal concussion, definite default duration that switches, when the duration of vehicle-mounted AP and the built vertical bridge joint of the other AP of backbone is not less than default switching duration, is updated to the other AP of backbone by the other AP of emergency rail stored along the way.
S306, the other AP of emergency rail stored along the way is updated to the other AP of backbone, and vehicle-mounted AP with upgrade after the other AP of backbone set up bridge joint.
S307, by each AP except the other AP of the backbone after upgrading listening to, the AP that signal strength signal intensity is the strongest is updated to the other AP of emergency rail stored along the way.This flow process finishes.
The other AP of backbone is used in S308, continuation.Enter step S301.
Further, in embodiment 1, the Rule of judgment of step S302, step S303 and step S304, step S305 can be carried out with any order, and embodiment 1 provides preferably execution sequence, for example, can also carry out judgement according to step S305, step S303 and step S304, step S302.
Embodiment 2:
In the embodiment of the present invention 2, for vehicle-mounted AP, provide a kind of vehicle-mounted AP fault detection mechanism, a kind of vehicle-mounted switching equipment link switch-over method, as shown in Figure 4, specifically comprises the steps:
The vehicle-mounted switching equipment that S401, utilization are connected with vehicle-mounted AP is according to the default rule of surveying, and surveys the connectedness of the main communication link that described vehicle-mounted switching equipment communicates by vehicle-mounted AP.
Further, each subway carriage can also be provided with vehicle-mounted switching equipment, and this vehicle-mounted switching equipment is externally connected with vehicle-mounted AP, internally can connect the wireline equipment in compartment, for example camera, also can connect two-way AP, for the wireless device in compartment provides access point.Take subway carriage as example, when each subway carriage possesses a vehicle-mounted AP, using the link at the vehicle-mounted AP place in vehicle-mounted switching equipment and self compartment, place as main communication link, the link at the vehicle-mounted AP place in these other compartments that vehicle-mounted switching equipment is connected with vehicle-mounted switching equipment in other compartments and the vehicle-mounted switching equipment in this other compartments is as spare communication link.
Preferably, in currently available technology, wired connection normally between vehicle-mounted switching equipment in compartment, and wiring is not too convenient in compartment, if by midfeather the vehicle-mounted switching equipment in two compartments in several compartments be directly connected, can cause wiring complicated, and oversize with line, therefore, in order to connect up conveniently, can preferably the vehicle-mounted switching equipment of adjacent compartment be connected, and by vehicle-mounted switching equipment and the vehicle-mounted switching equipment of self adjacent compartment, and the link at the vehicle-mounted AP of this adjacent compartment place of the vehicle-mounted switching equipment connection of this adjacent compartment is as spare communication link.
When not being that each subway carriage is while possessing vehicle-mounted AP, can using vehicle-mounted switching equipment with specify the link at vehicle-mounted AP place as main communication link, using the link at the vehicle-mounted switching equipment of vehicle-mounted switching equipment and adjacent compartment and main communication link place corresponding to the vehicle-mounted switching equipment of adjacent compartment as spare communication link.
In this step, the default rule of surveying can arrange according to actual conditions, for example, according to surveying during week, or real-time detection etc.
In this step, switching equipment can send heartbeat packet by the vehicle-mounted AP in main communication link, surveys the connectedness of main communication link.
S402, when definite main communication link breaks down, switch to the spare communication link that vehicle-mounted switching equipment communicates by other vehicle-mounted switching equipment and carry out transfer of data, wherein, described other vehicle-mounted switching equipment are the vehicle-mounted switching equipment in other compartments except this compartment, vehicle-mounted switching equipment place.
In this step, the vehicle-mounted AP connecting to self when switching equipment sends heartbeat packet, while not receiving heartbeat respond packet in Preset Time, can determine that the main communication link at the vehicle-mounted AP place that switching equipment is connected with self breaks down.Switching equipment can be corresponding by the vehicle-mounted switching equipment of neighbours connecting with self main communication link carry out transfer of data.
S403, when detecting main communication link and recover normal, switch back main communication link and carry out transfer of data.
In this step, after being switched to spare communication link, continuation is surveyed main communication link, because when using spare communication link, this spare communication link has carried the transfer of data at least two compartments, can affect data transmission quality simultaneously, therefore, need vehicle-mounted switching equipment proceed to survey to the main communication link of fault, when detecting main communication link and recover normal, switch back main communication link and carry out transfer of data.
Further, the compartment network system architecture schematic diagram that a kind of vehicle-mounted switching equipment link switch-over method providing based on the embodiment of the present invention 2 obtains as shown in Figure 5, 501He compartment, compartment 502 is adjacent two joint compartments, take compartment 501 as example, in compartment 501, be provided with vehicle-mounted AP503, this vehicle-mounted AP503 is externally connected with the other AP504 of backbone, internally be connected with vehicle-mounted switching equipment 505, vehicle-mounted switch 505 can connect wired camera 506 and two-way AP507, this two-way AP507 is used to the wireless device in compartment 501 that WAP (wireless access point) is provided, vehicle-mounted switch 505 is connected with the vehicle-mounted switching equipment 508 in compartment 502, wherein, the link at vehicle-mounted switching equipment 505 and vehicle-mounted AP503 place can be used as the main communication link of vehicle-mounted switching equipment 505, the link at vehicle-mounted switching equipment 505 and vehicle-mounted switching equipment 508 places can be used as the spare communication link of vehicle-mounted switching equipment 505.
Based on same inventive concept, the embodiment of the present invention also provides a kind of vehicle-mounted AP and system, because the principle that these vehicle-mounted AP deal with problems with system is similar to link switch-over method under aforementioned a kind of high-speed motion state, therefore the enforcement of this vehicle-mounted AP and system can, referring to the enforcement of preceding method, repeat part and repeat no more.
A kind of vehicle-mounted AP that the embodiment of the present invention provides, as shown in Figure 6, comprising:
Further, described judge module 602, also for the other AP of described emergency rail stored along the way being updated to the other AP of backbone at described handover module 603, and before the other AP of the backbone after described vehicle-mounted AP and renewal sets up bridge joint, the condition that the backbone side AP before judgement is upgraded need to be simultaneously satisfied also comprises: the backbone side AP before renewal and the duration of the built vertical bridge joint of described vehicle-mounted AP are not less than the default duration that switches.
Further, described vehicle-mounted AP, also comprises: update module 604;
Described update module 604, for the other AP of described emergency rail stored along the way being updated to the other AP of backbone at described handover module 603, and with upgrade after the other AP of backbone set up bridge joint after, by in each AP the other AP of the backbone after described renewal listening to, the AP that signal strength signal intensity is the strongest is updated to the other AP of emergency rail stored along the way.
Link switching system under a kind of high-speed motion state that the embodiment of the present invention provides, comprising: above-mentioned vehicle-mounted AP and vehicle-mounted switch;
Described vehicle-mounted switch, for according to the default rule of surveying, surveys the connectedness of the main communication link that described vehicle-mounted switching equipment communicates by described vehicle-mounted AP; When definite described main communication link breaks down, switch to the spare communication link that described vehicle-mounted switching equipment communicates by other vehicle-mounted switching equipment and carry out transfer of data, wherein, described other vehicle-mounted switching equipment are the vehicle-mounted switching equipment in other compartments except compartment, described vehicle-mounted switching equipment place.
Further, described vehicle-mounted switch, also for after switching to described spare communication link, when detecting described main communication link and recover normal, switches back described main communication link and carries out transfer of data
The function of above-mentioned each unit can, corresponding to the respective handling step in flow process shown in Fig. 2 to Fig. 4, not repeat them here.
Link switch-over method, vehicle-mounted AP and system under the high-speed motion state that the embodiment of the present invention provides, obtain the signal strength signal intensity of the trackside AP that vehicle-mounted access point AP listens to according to default monitoring rule; Whether judgement meets following condition with the other AP of backbone that described vehicle-mounted AP has set up bridge joint simultaneously: the signal strength signal intensity of the other AP of described backbone is less than default switching threshold; The signal strength signal intensity of the other AP of described backbone is less than the signal strength signal intensity of the other AP of emergency rail stored along the way of described vehicle-mounted AP; Signal strength difference between the other AP of described backbone and the other AP of emergency rail stored along the way is greater than preset difference value threshold value; If meet, the other AP of described emergency rail stored along the way is updated to the other AP of backbone, and the other AP of the backbone after described vehicle-mounted AP and renewal sets up bridge joint, wherein, by described emergency rail stored along the way, AP is when by described vehicle-mounted AP and described backbone, AP sets up bridge joint, in each AP except the other AP of described backbone that described vehicle-mounted AP listens to, the AP that signal strength signal intensity is the strongest.Before determining and need to upgrading the other AP of backbone, first judge whether the other AP of backbone meets a plurality of conditions, for the signal strength signal intensity of the other AP of backbone, be less than the condition of default switching threshold, when the signal strength signal intensity of the other AP of backbone is not less than default switching threshold, do not carry out the switching of the other AP of backbone, in the situation that the signal strength signal intensity of the other AP of current backbone does not affect use, avoided the switching of the other AP of backbone; The signal strength difference of signal strength signal intensity that is less than the other AP of emergency rail stored along the way of vehicle-mounted AP for the signal strength signal intensity of the other AP of backbone is greater than the condition of preset difference value threshold value, by backbone, the signal strength signal intensity of AP is less than the signal strength signal intensity of the other AP of emergency rail stored along the way, and when the difference between the other AP of backbone and the other AP signal strength signal intensity of emergency rail stored along the way is not more than preset difference value threshold value, do not carry out the renewal of the other AP of backbone, further, in the situation that the signal strength signal intensity of the other AP of current backbone does not affect use, avoided the switching of the other AP of backbone; In prior art, when vehicle-mounted AP detects while existing the signal strength signal intensity of trackside AP to be greater than to have set up the signal strength signal intensity of trackside AP of link with this vehicle-mounted AP, with regard to handoff links, compare, reduced link switching number of times, thereby while having reduced link switching, signal shakes the loss that causes packet.
Through the above description of the embodiments, those skilled in the art can be well understood to the embodiment of the present invention and can realize by hardware, and the mode that also can add necessary general hardware platform by software realizes.Understanding based on such, the technical scheme of the embodiment of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (10)
1. a link switch-over method under high-speed motion state, is characterized in that, comprising:
Obtain the signal strength signal intensity of the trackside AP that vehicle-mounted access point AP listens to according to default monitoring rule;
Whether judgement meets following condition with the other AP of backbone that described vehicle-mounted AP has set up bridge joint simultaneously:
The signal strength signal intensity of the other AP of described backbone is less than default switching threshold; And
The signal strength difference of signal strength signal intensity that the signal strength signal intensity of the other AP of described backbone is less than the other AP of emergency rail stored along the way of described vehicle-mounted AP is greater than preset difference value threshold value;
If meet, the other AP of described emergency rail stored along the way is updated to the other AP of backbone, and the other AP of the backbone after described vehicle-mounted AP and renewal sets up bridge joint, wherein, by described emergency rail stored along the way, AP is when by described vehicle-mounted AP and described backbone, AP sets up bridge joint, in each AP except the other AP of described backbone that described vehicle-mounted AP listens to, the AP that signal strength signal intensity is the strongest.
2. the method for claim 1, is characterized in that, the other AP of described emergency rail stored along the way is being updated to the other AP of backbone, and described vehicle-mounted AP with upgrade after the other AP of backbone set up bridge joint before, the condition that the other AP of backbone before renewal need to be simultaneously satisfied also comprises:
The other AP of backbone before described renewal and the duration of the built vertical bridge joint of described vehicle-mounted AP are not less than the default duration that switches.
3. method as claimed in claim 1 or 2, is characterized in that, also comprises:
Utilize the vehicle-mounted switching equipment is connected with described vehicle-mounted AP regular according to default detection, survey the connectedness of the main communication link that described vehicle-mounted switching equipment communicates by described vehicle-mounted AP;
When definite described main communication link breaks down, switch to the spare communication link that described vehicle-mounted switching equipment communicates by other vehicle-mounted switching equipment and carry out transfer of data, wherein, described other vehicle-mounted switching equipment are the vehicle-mounted switching equipment in other compartments except compartment, described vehicle-mounted switching equipment place.
4. method as claimed in claim 3, is characterized in that, after switching to described spare communication link, also comprises:
When detecting described main communication link and recover normal, switch back described main communication link and carry out transfer of data.
5. method as claimed in claim 1 or 2, is characterized in that, the other AP of described emergency rail stored along the way is updated to the other AP of backbone, and with upgrade after the other AP of backbone set up bridge joint after, also comprise:
By in each AP the other AP of the backbone after described renewal listening to, the AP that signal strength signal intensity is the strongest is updated to the other AP of emergency rail stored along the way.
6. a vehicle-mounted AP, is characterized in that, comprising:
Monitor module, for the signal strength signal intensity of the trackside access point AP that listens to according to default monitoring rule;
Judge module, for judge whether the other AP of backbone that has set up bridge joint with described vehicle-mounted AP meets following condition simultaneously: the signal strength signal intensity of the other AP of described backbone is less than default switching threshold; And the signal strength difference of signal strength signal intensity that the signal strength signal intensity of the other AP of described backbone is less than the other AP of emergency rail stored along the way of described vehicle-mounted AP is greater than preset difference value threshold value;
Handover module, if described judge module is judged described backbone, other AP meets above-mentioned condition, the other AP of described emergency rail stored along the way is updated to the other AP of backbone, and the other AP of the backbone after described vehicle-mounted AP and renewal sets up bridge joint, wherein, by described emergency rail stored along the way, AP is when by described vehicle-mounted AP and described backbone, AP sets up bridge joint, in each AP except the other AP of described backbone that described vehicle-mounted AP listens to, and the AP that signal strength signal intensity is the strongest.
7. vehicle-mounted AP as claimed in claim 6, it is characterized in that, described judge module, also for the other AP of described emergency rail stored along the way being updated to the other AP of backbone at described handover module, and before the other AP of the backbone after described vehicle-mounted AP and renewal sets up bridge joint, the condition that the backbone side AP before judgement is upgraded need to be simultaneously satisfied also comprises: the backbone side AP before renewal and the duration of the built vertical bridge joint of described vehicle-mounted AP are not less than the default duration that switches.
8. the vehicle-mounted AP as described in claim 6 or 7, is characterized in that, also comprises: update module;
Described update module, for the other AP of described emergency rail stored along the way being updated to the other AP of backbone at described handover module, and with upgrade after the other AP of backbone set up bridge joint after, by each AP the other AP of the backbone except described renewal after listening to, the AP that signal strength signal intensity is the strongest is updated to emergency rail stored along the way side AP.
9. a link switching system under high-speed motion state, is characterized in that, comprising: vehicle-mounted access point AP and vehicle-mounted switch as described in claim 6-8 any one;
Described vehicle-mounted switch, for according to the default rule of surveying, surveys the connectedness of the main communication link that described vehicle-mounted switching equipment communicates by described vehicle-mounted AP; When definite described main communication link breaks down, switch to the spare communication link that described vehicle-mounted switching equipment communicates by other vehicle-mounted switching equipment and carry out transfer of data, wherein, described other vehicle-mounted switching equipment are the vehicle-mounted switching equipment in other compartments except compartment, described vehicle-mounted switching equipment place.
10. system as claimed in claim 9, is characterized in that, described vehicle-mounted switch, also for after switching to described spare communication link, when detecting described main communication link and recover normal, switches back described main communication link and carries out transfer of data.
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| CN201310675028.0A CN103731890A (en) | 2013-12-11 | 2013-12-11 | Link switching method under high-speed motion state, vehicle-mounted AP and system |
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