CN106454982B - Link switching method and system in wireless communication network - Google Patents
Link switching method and system in wireless communication network Download PDFInfo
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- CN106454982B CN106454982B CN201610913131.8A CN201610913131A CN106454982B CN 106454982 B CN106454982 B CN 106454982B CN 201610913131 A CN201610913131 A CN 201610913131A CN 106454982 B CN106454982 B CN 106454982B
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
Abstract
The invention provides a link switching method and a system in a wireless communication network, wherein the method comprises the steps of scanning a base station with a signal-to-noise ratio larger than a first threshold value in a preset range; according to the scanning result, link connection is established with the base station with the largest signal-to-noise ratio, the standby base stations with the signal-to-noise ratios larger than a second threshold value are obtained according to the scanning result, link connection is respectively established with the obtained 1 or more standby base stations, and the obtained links of the standby base stations are used as standby links; when the communication quality on the main link is deteriorated, selecting a standby link for link switching, and reacquiring a standby base station and establishing the standby link after the switching is successful; the system comprises a scanning module, a main link module, a standby link module and a link switching module. The invention realizes the fast and reliable switching of the link in the wireless communication network, simultaneously realizes the stable and fast switching of the wireless link, reduces the ping-pong switching between the wireless links and improves the service data transmission capability of an air interface.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and a system for link switching in a wireless communication network.
Background
With the rapid development of communication technology, especially wireless communication technology, the wireless communication technology does not need to lay complex communication cables, provides a high-throughput bidirectional passage channel, supports equipment movement, provides the advantages of convenience, rapidness and reliability in communication network access, equipment installation, arrangement, maintenance and the like, is simple and convenient, and has low cost, so that the rapid application of the wireless technology to various industrial control systems is promoted. When the coverage of the wireless signals is set, the general wireless communication technology adopts a cellular or network coverage mode, so that the coverage of the wireless signals of adjacent regions at the same place can be conveniently realized, and the switching of the mobile station between different wireless base stations or cells is conveniently realized.
The general wireless link switching method needs the mobile station to periodically scan the characteristics of a plurality of wireless base stations or cells of the received announcement information, compare the wireless link establishing parameters such as field intensity, signal to noise ratio and the like between the mobile station and all the base stations, and establish a new wireless communication link while disconnecting the wireless communication link between the original associated base stations. In the process, a large amount of signaling data interaction exists, so that the problems of air interface signaling transmission and too large air interface overhead are caused, and the transmission bandwidth of a wireless channel is greatly influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a link switching method and a link switching system in a wireless communication network, which realize the quick and reliable switching of the link in the wireless communication network, simultaneously realize the stable and quick switching of the wireless link, reduce the ping-pong switching between the wireless links and improve the service data transmission capability of an air interface.
In order to solve the technical problems, the invention provides the following technical scheme:
in one aspect, the present invention provides a link switching method in a wireless communication network, including:
scanning base stations with signal-to-noise ratios larger than a first threshold value in a preset range;
according to the scanning result, link connection is established with the base station with the largest signal-to-noise ratio, the link is used as a main link, and N standby base stations with signal-to-noise ratios larger than a second threshold value are obtained according to the scanning result, wherein N is larger than or equal to 1, and the second threshold value is larger than a first threshold value;
respectively establishing link connection with the obtained N standby base stations, and taking the N links as standby links;
and when the communication quality on the main link is deteriorated, selecting 1 standby link from the N established standby links to carry out link switching, and after the switching is successful, reacquiring the current N standby base stations with the signal-to-noise ratios larger than a second threshold value and establishing the standby links.
Further, the scanning the base stations whose signal-to-noise ratios within the preset range are greater than the first threshold includes:
acquiring the signal-to-noise ratio of each base station in a preset range;
scanning the base station with the signal-to-noise ratio larger than a first threshold value according to the preset first threshold value; wherein, the first threshold value is the preliminary screening value of the signal-to-noise ratio.
Further, the establishing a link connection with the base station with the largest signal-to-noise ratio according to the scanning result, taking the link as the active link, and acquiring N standby base stations with signal-to-noise ratios larger than the second threshold according to the scanning result includes:
according to the scanning result, link connection is established with the base station with the largest signal-to-noise ratio, and the link is used as a main link;
and acquiring N standby base stations with the signal-to-noise ratios larger than a second threshold value according to the scanning result.
Further, when the communication quality on the active link deteriorates, selecting 1 backup link from the N established backup links to perform link switching includes:
when the communication quality on the main link is deteriorated, acquiring a standby link with the signal-to-noise ratio larger than a third threshold value from the N established standby links;
and selecting 1 spare link with the signal-to-noise ratio larger than a third threshold value for link switching, and determining the spare link as the current active link.
Further, selecting 1 backup link with a signal-to-noise ratio greater than a third threshold for link switching includes:
selecting 1 spare link from the spare links with the signal-to-noise ratio larger than a third threshold value, and acquiring the duration of the spare link with the signal-to-noise ratio larger than the third threshold value;
if the duration is longer than the delay control parameter, selecting the standby link to switch the link; the hysteresis control parameter is a preset time parameter.
Further, if the duration is greater than the hysteresis control parameter, selecting the standby link for link switching, and then:
and if the duration is less than or equal to the hysteresis control parameter, selecting the next standby link from the standby links with the signal-to-noise ratio greater than the third threshold value to judge the duration again.
In another aspect, the present invention provides a link switching system in a wireless communication network, including:
the scanning module is used for scanning the base stations with the signal-to-noise ratio larger than a first threshold value in a preset range;
the active link module is used for establishing link connection with the base station with the largest signal-to-noise ratio according to the scanning result, taking the link as an active link, and acquiring N standby base stations with signal-to-noise ratios larger than a second threshold value according to the scanning result, wherein N is larger than or equal to 1, and the second threshold value is larger than the first threshold value;
the standby link module is used for respectively establishing link connection with the acquired N standby base stations and taking the N links as standby links;
and the link switching module is used for selecting 1 standby link from the N established standby links to perform link switching when the communication quality on the main link is deteriorated, and reacquiring the current N standby base stations with the signal-to-noise ratios larger than the second threshold value after the switching is successful and establishing the standby links.
Further, the scanning module includes:
the signal-to-noise ratio acquisition unit is used for acquiring the signal-to-noise ratio of each base station in a preset range;
the scanning unit is used for scanning the base station with the signal-to-noise ratio larger than a first threshold value according to the preset first threshold value; wherein, the first threshold value is the preliminary screening value of the signal-to-noise ratio.
Further, the active link module includes:
a main link establishing unit, configured to establish a link connection with a base station with the largest signal-to-noise ratio according to a scanning result, and use the link as a main link;
and the standby base station acquisition unit is used for acquiring N standby base stations with the signal-to-noise ratios larger than a second threshold value according to the scanning result.
Further, the link switching module includes:
a standby link obtaining unit, configured to obtain, when communication quality on the active link deteriorates, a standby link whose signal-to-noise ratio is greater than a third threshold from among the N established standby links;
the standby link switching unit is used for selecting 1 standby link from the standby links with the signal-to-noise ratios larger than the third threshold value and acquiring the duration time of the standby links with the signal-to-noise ratios larger than the third threshold value; if the duration is longer than the delay control parameter, selecting the standby link to switch the link, and confirming the standby link as the current main link; the delay control parameter is a preset time parameter; and if the duration is less than or equal to the hysteresis control parameter, selecting the next standby link from the standby links with the signal-to-noise ratio greater than the third threshold value to judge the duration again.
According to the technical scheme, the link switching method and the link switching system in the wireless communication network realize the quick and reliable switching of the link in the wireless communication network, simultaneously realize the stable and quick switching of the wireless link, reduce the ping-pong switching between the wireless links and improve the service data transmission capability of an air interface.
1. According to the technical scheme, by setting various threshold parameters for fast switching control, the signal scanning and signal comparison processes of the mobile station are reduced, and signaling overhead is reduced; radio link switching control for improving the utilization rate of a radio channel.
2. The technical scheme of the invention establishes the standby link when the main link can meet the wireless communication requirement after the main link is established, thereby completing the authentication, communication mechanism negotiation and other processes in the new wireless link establishing process in advance/in advance when the new wireless link is to be established after the link is broken in the prior art, reducing the time for performing the operations after the link is switched and realizing the rapid switching of the wireless link.
3. In the technical scheme of the invention, the number of scanning times of the mobile station to the base station is reduced by increasing the switching control threshold parameter, when the wireless signal meets the requirement, the maintenance work of the wireless link state is reduced to the maximum extent, the overhead of an air interface signaling is reduced, and the utilization rate of the wireless channel is improved.
4. According to the technical scheme, the switching hysteresis control parameter, the second threshold value and the first threshold value are added, and the combination of the signal-to-noise ratio and the time is used for avoiding the ping-pong switching of the wireless link caused by a distortion area in the wireless signal covering process.
5. Compared with the prior art, the standby wireless link is not arranged in the prior art, so the Client inquires the signal-to-noise ratio values of a plurality of base stations in real time; in the invention, because of the standby wireless link, the process of inquiring the signal-to-noise ratio value of the new base station is started only after the value of any one of the active link and the standby link is reduced to be lower than the threshold value, thereby reducing the occupation of the inquired wireless resources.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flow chart illustrating a link switching method in a wireless communication network according to the present invention;
FIG. 2 is a flow chart of step 400 of the handoff method of the present invention;
FIG. 3 is a flow chart of step 402 of the handover method of the present invention;
FIG. 4 is a logic diagram of link switching of a link switching method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a link switching system in a wireless communication network according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the wireless communication network, a mobile terminal device capable of performing wireless communication with a base station is connected in link communication, in the following embodiments, the device is referred to as a mobile station, and in the embodiments, a mobile station is taken as an example for detailed description, but it should be understood that any device having the same function as the mobile station, which can implement the present invention, is within the protection scope of the present invention, that is, a mobile station is provided in the mobile terminal in the wireless communication network, the mobile station is a vehicle-mounted type, portable type or handheld type device, etc., and is controlled by a mobile terminal user, and a bidirectional wireless communication circuit is established with the base station for communication.
Referring to fig. 1, a method for switching a link in a wireless communication network according to an embodiment of the present invention specifically includes the following steps:
step 100: and scanning the base stations with the signal-to-noise ratio larger than the first threshold value in the preset range.
In this step, after the mobile station is powered on and started, the link switching system determines a preset range within which the mobile station moves, and then the link switching system acquires the signal-to-noise ratio of each base station according to self state information issued by all base stations in the preset range in real time; then, the link switching system scans the base stations of which the signal-to-noise ratio is greater than a first threshold value Hold _ RSSI; wherein, the first threshold value Hold _ RSSI is a scanning signal-to-noise ratio threshold value for starting the base station by the mobile station; the link switching system mentioned in the invention can be the mobile station itself, a part arranged on the mobile station or an independent individual in communication connection with the mobile station; the base station mentioned in the present invention may be a base station in a certain area network, or may be a base station used for distinguishing cells in different directions in the base station, and the meaning of the base station mentioned later is the same, and is not described again.
Step 200: according to the scanning result, link connection is established with the base station with the largest signal-to-noise ratio, the link is used as an active link, and N standby base stations with signal-to-noise ratios larger than a second threshold value are obtained according to the scanning result, wherein N is larger than or equal to 1 and is a positive integer, namely N is a numerical value equal to or larger than 1 in the embodiment of the invention, and the second threshold value is larger than the first threshold value.
In this step, the link switching system determines the communication signal strength between the mobile station and each base station in the scanned base stations, and selects the base station with the highest communication signal strength as its current primary base station, and the link switching system establishes the link communication connection between the mobile station and the primary base station, and uses the link as the primary link, so as to perform wireless information transmission between the mobile station and the primary base station; meanwhile, the link switching system selects N standby base stations with signal-to-noise ratios larger than a second threshold value from the scanned base stations and the base stations except the main base station, wherein the value of N is the maximum Max No. of the number of the wireless links which can be established; the second threshold is greater than the first threshold Hold _ RSSI, and the second threshold is equal to the sum of the first threshold Hold _ RSSI and the hysteresis control parameter margin 2.
Step 300: and respectively establishing link connection with the acquired N standby base stations, and taking the N links as standby links.
In this step, the link switching system controls the mobile station to establish link connections with the N backup base stations, and uses the N links as N backup links of the mobile station, so as to be used for direct switching replacement when the mobile station weakens communication signals with the active link in the moving process.
Step 400: when the communication quality on the main link is deteriorated, 1 standby link is selected from the N established standby links to carry out link switching, and the current N standby base stations with the signal-to-noise ratios larger than the second threshold value are obtained again after the switching is successful, and the standby links are established.
In this step, if the mobile station monitors that the communication signal between the mobile station and the current active link starts to weaken gradually during the traveling process of the mobile station, and the signal-to-noise ratio of the active base station is smaller than the preset minimum value of the communication signal-to-noise ratio, the link switching system controls the mobile station to select 1 standby link from the N standby links to perform link switching, select 1 standby link from the standby links to perform link switching, determine the standby link as the current active link, and then, after acquiring N standby base stations with signal-to-noise ratios greater than the second threshold again, return to step 300 to re-establish the standby link.
The first threshold Hold _ RSSI, the hysteresis control parameter margin2 used for calculating the second threshold, and the maximum value Max No. of the number of wireless links that can be established for taking the value N mentioned in this embodiment may be preset according to actual conditions before the mobile station is put into a preset range area to operate.
As can be seen from the above description, the link switching method in the wireless communication network according to the embodiment of the present invention selectively scans each base station through the first threshold, so as to enhance the efficiency of searching for the base station suitable for the mobile terminal, and improve the efficiency and success rate of re-screening the base station in the following; determining a standby base station through a second threshold value, and reducing the influence of a field intensity distortion area on the chain establishment of a standby link; by establishing N standby links, the defects of air interface overhead and reduced utilization rate caused by one-by-one link establishment before each switching are effectively reduced, and the rapid switching process between the mobile station and the base station is realized; the radio link switching control which reduces the signaling transmission and improves the utilization rate of the radio channel is realized by the combined application of the switching control parameters.
Further, a specific implementation manner of the step 400 is given in the second embodiment of the present invention. Referring to fig. 2, the step 400 is implemented as follows:
step 401: and when the communication quality on the main link is deteriorated, acquiring the standby link with the signal-to-noise ratio larger than a third threshold value from the N established standby links.
In this step, in the traveling process of the mobile station, if the link switching system monitors that the communication signal between the mobile station and the current active link starts to gradually decrease and the signal-to-noise ratio of the active base station is smaller than the preset minimum value of the communication signal-to-noise ratio, a standby link with a signal-to-noise ratio larger than a third threshold is obtained from the N standby links that are established, and the third threshold is equal to the sum of the first threshold Hold _ RSSI and the hysteresis control parameter margin 1, where the hysteresis control parameter margin 1 may be preset to be larger than the hysteresis control parameter margin2 according to an actual situation before the mobile station is put into a preset range region to operate, and may also be equal to or smaller than the value of the hysteresis control parameter margin 2.
Step 402: and selecting 1 spare link with the signal-to-noise ratio larger than a third threshold value for link switching, and confirming the spare link as the current active link. In this step, the link switching system controls the mobile station to select 1 backup link with the signal-to-noise ratio greater than the third threshold value for link switching, and confirms the backup link as the current active link of the mobile station.
As can be seen from the above description, by setting the third threshold, the standby link is switched to the active link only when the signal-to-noise ratio of the standby link is greater than the sum of the first threshold Hold _ RSSI and the hysteresis control parameter margin 1, so that the influence of the field intensity distortion region on the switching between the available wireless link and the standby link is reduced.
Further, a specific implementation manner of the step 402 is given in the third embodiment of the present invention. Referring to fig. 3, the step 402 is implemented as follows:
step 402-1: and selecting 1 spare link from the spare links with the signal-to-noise ratios larger than the third threshold value, and acquiring the duration of the spare link with the signal-to-noise ratio larger than the third threshold value.
In this step, the link switching system selects 1 backup link in turn or randomly from the backup links whose snr is greater than the third threshold, and the link switching system obtains the duration of the backup link whose snr is greater than the third threshold.
Step 402-2: if the duration is longer than the delay control parameter, selecting the standby link to switch the link; and if the duration is less than or equal to the hysteresis control parameter, selecting the next standby link from the standby links with the signal-to-noise ratio greater than the third threshold value to judge the duration again.
In this step, the hysteresis control parameter is a preset Time parameter Time, if the duration that the snr of the currently selected link is greater than the third threshold is greater than the Time parameter Time, the link switching system determines that the standby link can be switched to the active link, and if the duration that the snr of the currently selected link is less than or equal to the third threshold is less than or equal to the Time parameter Time, it is necessary to select a new link at another standby link whose snr is greater than the third threshold again and compare the new link with the Time parameter Time.
As can be seen from the above description, the setting of the Time parameter avoids the ping-pong switching of the wireless link caused by the distortion area in the wireless signal coverage process, and the increase of the air interface signaling caused by the frequent scanning of the signal and the ping-pong switching of the link, thereby improving the service data transmission capability of the air interface.
The general wireless link switching method needs the mobile station to periodically scan the characteristics of a plurality of wireless base stations or cells of the received announcement information, and compares the wireless link establishing parameters such as field intensity, signal-to-noise ratio and the like between the mobile station and different base stations or cells. A new wireless communication link is established with a base station or cell that can provide higher communication quality, higher availability, higher reliability while the wireless communication link between the originally associated base station or cell is broken. In order to ensure that the link can be switched normally and a large amount of signaling data interaction exists between the base station and the mobile station in fast switching, the data all occupy the transmission throughput of the wireless channel and influence the transmission bandwidth of the wireless channel.
While the general link switching method is suitable for a wireless communication system which adopts high transmission power and adopts cellular or network to cover wireless signals, the switching method has the following problems:
1. the base station needs to declare the state information of the base station in real time, and the base station is used for the mobile station to discover the base station in time;
2. in order to realize the fast switching of the mobile station in the process of a plurality of base stations, the mobile station needs to scan the peripheral discovered wireless base station states in real time, compare the states with the states among all the base stations at any time, select a wireless link with better quality, and increase the transmission of air interface signaling, increase the air interface overhead and reduce the air interface utilization rate in the signal scanning and state comparison processes;
3. in the switching process, the mobile station needs to disconnect the original wireless link first and then establish a switching mode of a new wireless link, so that the time period of the wireless link disconnection inevitably exists, and the process of short interruption of wireless communication exists.
To further illustrate the method, the present invention also provides a specific application example of the link switching method in the wireless communication network. Referring to fig. 4, the specific steps of the handover method are as follows:
the value of Hold _ RSSI is set to-25 dBm (signal-to-noise ratio, unitless).
Step 1, when a wireless communication unit (Client) on a train initially establishes a link, the signal strength of an AP1 is high, namely the RSSI value of an AP1 is greater than Hold _ RSSI, and the Client establishes an Active link with an AP 1;
step 2, because the Link number (Link) of the wireless communication unit (Client) is less than the MAX No. value, the scanning needs to be started to establish the Dormant Link, the Client continues to search for another AP which is the Dormant Link, for example, the RSSI value of the AP2 is found to be higher than Hold _ RSSI, and the amplitude higher than Hold _ RSSI exceeds margin2 (for example, the value of margin2 is set to be 3dB), the wireless communication unit establishes the Dormant Link with the AP2, and meanwhile, the Active Link with the AP1 is maintained;
step 3, along with the operation of the train, two situations can occur in the link between the Client and the AP 1:
3a, in one case, the field intensity of the AP1 is gradually reduced, and as the field intensity of the AP1 is reduced to be lower than that of the AP2, and the Time that the RSSI value of the AP2 > Hold _ RSSI + margin _1 (for example, the value of margin 1 is set to 5dB) lasts for more than one Time (the value of Time is generally, for example, 5 to 100 milliseconds), the link state of the AP1 is degraded from Active to Dormant, at this Time, the AP1 has signaling maintenance and no interaction of service data, and the link state of the AP2 is upgraded from Dormant to Active, and there are both signaling transmission and service data transmission between the link of the AP2 and the Client;
3b, in another case, the field intensity of the AP1 is suddenly reduced, and at the moment, the wireless link of the AP1 is directly interrupted, and no data or signaling exists; the Dormant link of the AP2 is automatically changed into an Active link, and both signaling transmission and service data transmission exist between the link of the AP2 and the Client;
and 4, step 4:
4a, following the step 3a, when the field intensity of the AP1 is gradually reduced to the broken link, the Client starts to scan a new Dormant link, namely, the step 2 is repeated to try to establish the Dormant link with the AP 3;
4b, following the step 3b, when the AP1 is broken, repeating the process of the step 2, and starting scanning to establish a Dormant link;
step 5, if the appropriate Dormant link can not be found continuously, a probe request is carried out by taking 1 second as a period to find an available Dormant link, even if the field intensity of the current Active link such as AP3 is continuously reduced, the Client maintains the Active link as much as possible until the field intensity of the AP3 is smaller than the requirement of receiving sensitivity or a new AP is found;
step 6, when the Client finds that the signal-to-noise ratio RSSI of the AP4 is greater than Hold _ RSSI + margin2 and the duration is greater than Time, the Client directly establishes an Active link with the AP4 and disconnects the link with the AP3 with weak field strength, and meanwhile, the Client continuously searches for a new Dormant link according to the conditions in the step 2; so as to circularly reciprocate. Of course, at this time, if the field strength of the AP3 meets the requirements of the Dormant link, the AP3 may still be switched to the Dormant link, rather than always disconnecting the link.
Wherein, the setting distance of each parameter is as follows:
Hold-RSSI：-25dBm；
Margin1：5dB；
Margin2：3dB；
Time：5ms。
as can be seen from the above description, in the present application, the mobile station determines to establish several backup links (Dormant links) according to the specific setting value of "Max No.", and the signal-to-noise ratio of the wireless signal to be scanned during establishing the backup links must be greater than the sum of two parameters "Hold _ RSSI" and "margin 2". Through the total arrangement, the influence of the field intensity distortion region on establishment of the Dormant link can be reduced; the mobile station compares the signal-to-noise ratio of the Active link and the Dormant link, and when the signal-to-noise ratio of the Dormant link is greater than the parameter 'margin 1' of the Active link and the duration Time exceeds the parameter 'Time', the Active link and the Dormant link are switched; by setting the parameter of 'Max No.' the signaling overhead of the mobile station in the processes of state acquisition, comparison, link authentication and authentication of the wireless link can be reduced; by setting the Hold _ RSSI parameter, the signaling overhead of the mobile station in the processes of scanning, state acquisition and comparison of a new wireless link when the wireless link state meets the application requirement can be reduced; the range of the distortion zone is not large, and is generally not larger than 10 meters. Therefore, ping-pong handover is reduced by adding some hysteresis parameters, such as "margin 1", "margin 2" and "Time" mentioned in the present application, during handover; through the setting of the 'margin 2' parameter, the link authentication and certification process of the Dormant link can be avoided once the mobile station scans the wireless signals higher than the 'Hold _ RSSI' parameter, and the ping-pong process of the Dormant link establishment is reduced; by setting two parameters of 'margin 1' and 'Time', the mobile station can be ensured to be capable of switching between the Active link and the Dormant link when the duration of the Dormant link is better than that of the Active link and long enough, thereby reducing the ping-pong process of a wireless channel.
Furthermore, the invention also provides a link switching system in the wireless communication network. Referring to fig. 5, the system of the present invention specifically includes the following:
the scanning module 10 is configured to scan a base station whose signal-to-noise ratio is greater than a first threshold value within a preset range.
The scanning module 10 further includes a signal-to-noise ratio obtaining unit and a scanning unit, wherein the signal-to-noise ratio obtaining unit is configured to obtain a signal-to-noise ratio of each base station within a preset range; the scanning unit is used for scanning the base station with the signal-to-noise ratio larger than a first threshold value according to the preset first threshold value; wherein, the first threshold value is the preliminary screening value of the signal-to-noise ratio.
The active link module 20 is configured to establish a link connection with the base station with the largest signal-to-noise ratio according to the scanning result, use the link as an active link, and obtain N standby base stations with signal-to-noise ratios larger than a second threshold according to the scanning result, where the second threshold is larger than the first threshold.
The main link module 20 further includes a main link establishing unit and a standby base station acquiring unit, where the main link establishing unit is configured to establish a link connection with a base station with the largest signal-to-noise ratio according to a scanning result, and use the link as a main link; the standby base station obtaining unit is used for obtaining N standby base stations with signal-to-noise ratios larger than a second threshold according to the scanning result, wherein the second threshold is larger than the first threshold, and N is the number of the preset standby base stations.
And a standby link module 30, configured to establish link connections with the acquired N standby base stations respectively, and use the N links as standby links.
And the link switching module 40 is configured to select 1 backup link from the N established backup links to perform link switching when the communication quality on the active link deteriorates, and reacquire the current N backup base stations whose signal-to-noise ratios are greater than the second threshold value after the switching is successful and establish the backup links. The link switching module 40 further includes a standby link obtaining unit and a standby link switching unit, where the standby link obtaining unit is configured to obtain, when communication quality on the active link deteriorates, a standby link whose signal-to-noise ratio is greater than a third threshold from the N established standby links, where the third threshold is greater than the second threshold; the standby link switching unit is used for selecting 1 standby link from the standby links with the signal-to-noise ratios larger than the third threshold value and acquiring the duration time of the standby links with the signal-to-noise ratios larger than the third threshold value; if the duration is longer than the delay control parameter, selecting the standby link to switch the link, and confirming the standby link as the current main link; the delay control parameter is a preset time parameter; and if the duration is less than or equal to the hysteresis control parameter, selecting the next standby link from the standby links with the signal-to-noise ratio greater than the third threshold value to judge the duration again.
As can be seen from the above description, the link switching system and method in the wireless communication network according to the embodiments of the present invention have one-to-one correspondence, and selectively scan each base station through the first threshold, thereby enhancing the efficiency of searching for the base station suitable for the mobile terminal, and improving the efficiency and success rate of re-screening the base station in the following; determining a standby base station through a second threshold value, and reducing the influence of a field intensity distortion area on the chain establishment of a standby link; by establishing N standby links, the defects of air interface overhead and reduced utilization rate caused by one-by-one link establishment before each switching are effectively reduced, and the rapid switching process between the mobile station and the base station is realized; the radio link switching control which reduces the signaling transmission and improves the utilization rate of the radio channel is realized by the combined application of the switching control parameters.
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A method of link switching in a wireless communication network, comprising:
scanning base stations with signal-to-noise ratios larger than a first threshold value in a preset range;
according to the scanning result, link connection is established with the base station with the largest signal-to-noise ratio, the link is used as a main link, and N standby base stations with signal-to-noise ratios larger than a second threshold value are obtained according to the scanning result, wherein N is larger than or equal to 1, and the second threshold value is larger than a first threshold value;
respectively establishing link connection with the obtained N standby base stations, and taking the N links as standby links;
when the communication quality on the main link is deteriorated, selecting 1 standby link from the N established standby links to perform link switching, and after the switching is successful, re-acquiring the current N standby base stations with the signal-to-noise ratios larger than a second threshold value and establishing the standby links;
wherein, when the communication quality on the active link deteriorates, selecting 1 backup link from the N established backup links to perform link switching includes:
when the communication quality on the main link is deteriorated, acquiring a standby link with the signal-to-noise ratio larger than a third threshold value from the N established standby links;
selecting 1 spare link with the signal-to-noise ratio larger than a third threshold value to switch the links, and determining the spare link as a current main link;
wherein, selecting 1 link from the standby links with the signal-to-noise ratio larger than the third threshold value for link switching comprises:
selecting 1 spare link from the spare links with the signal-to-noise ratio larger than a third threshold value, and acquiring the duration of the spare link with the signal-to-noise ratio larger than the third threshold value;
if the duration is longer than the delay control parameter, selecting the standby link to switch the link; the delay control parameter is a preset time parameter;
and if the duration is less than or equal to the hysteresis control parameter, selecting the next standby link from the standby links with the signal-to-noise ratio greater than the third threshold value to judge the duration again.
2. The method of claim 1, wherein the scanning for the base stations with the snr greater than the first threshold within the preset range comprises:
acquiring the signal-to-noise ratio of each base station in a preset range;
scanning the base station with the signal-to-noise ratio larger than a first threshold value according to the preset first threshold value; wherein, the first threshold value is the preliminary screening value of the signal-to-noise ratio.
3. A link switching system in a wireless communication network, comprising:
the scanning module is used for scanning the base stations with the signal-to-noise ratio larger than a first threshold value in a preset range;
the active link module is used for establishing link connection with the base station with the largest signal-to-noise ratio according to the scanning result, taking the link as an active link, and acquiring N standby base stations with signal-to-noise ratios larger than a second threshold value according to the scanning result, wherein N is larger than or equal to 1, and the second threshold value is larger than the first threshold value;
the standby link module is used for respectively establishing link connection with the acquired N standby base stations and taking the N links as standby links;
a link switching module, configured to select 1 backup link from the N established backup links to perform link switching when communication quality on the active link deteriorates, and reacquire current N backup base stations whose signal-to-noise ratios are greater than a second threshold after successful switching and establish a backup link;
the link switching module includes:
a standby link obtaining unit, configured to obtain, when communication quality on the active link deteriorates, a standby link whose signal-to-noise ratio is greater than a third threshold from among the N established standby links;
the standby link switching unit is used for selecting 1 standby link from the standby links with the signal-to-noise ratios larger than the third threshold value and acquiring the duration time of the standby links with the signal-to-noise ratios larger than the third threshold value; if the duration is longer than the delay control parameter, selecting the standby link to switch the link, and confirming the standby link as the current main link; the delay control parameter is a preset time parameter; and if the duration is less than or equal to the hysteresis control parameter, selecting the next standby link from the standby links with the signal-to-noise ratio greater than the third threshold value to judge the duration again.
4. The system of claim 3, wherein the scanning module comprises:
the signal-to-noise ratio acquisition unit is used for acquiring the signal-to-noise ratio of each base station in a preset range;
and the scanning unit is used for scanning the base station with the signal-to-noise ratio larger than the first threshold value according to a preset first threshold value.
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| CN111835639B (en) * | 2020-07-06 | 2021-03-19 | 杭州网银互联科技股份有限公司 | SD-WAN network intelligent link selection method based on cloud computing |
| CN112312437A (en) * | 2020-11-12 | 2021-02-02 | 福建阿古电务数据科技有限公司 | Internet of things wireless double-link self-adaptive communication system and method |
| CN113784377B (en) * | 2021-09-10 | 2024-03-22 | 深圳艾灵网络有限公司 | Data communication method, device, electronic equipment and storage medium |
| CN114125968B (en) * | 2021-11-19 | 2024-03-29 | 深圳市联平半导体有限公司 | Method and device for switching wireless access points of wireless terminal |
| CN116760878B (en) * | 2023-08-21 | 2023-12-01 | 每日互动股份有限公司 | Processing method, device, equipment and medium for network connection and transmission |
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