CN111491352A - Wireless roaming method and system for mobile terminal - Google Patents
Wireless roaming method and system for mobile terminal Download PDFInfo
- Publication number
- CN111491352A CN111491352A CN202010282076.3A CN202010282076A CN111491352A CN 111491352 A CN111491352 A CN 111491352A CN 202010282076 A CN202010282076 A CN 202010282076A CN 111491352 A CN111491352 A CN 111491352A
- Authority
- CN
- China
- Prior art keywords
- access point
- mobile terminal
- received signal
- signal strength
- point control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Security & Cryptography (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present disclosure relates to a method for implementing wireless roaming of a mobile terminal, which comprises: detecting, by a first access point connected to the mobile terminal, a first received signal strength from the mobile terminal and feeding back the detected first received signal strength to an access point control device; when the access point control equipment determines that the first received signal strength is smaller than the preset threshold value, other access points at least comprising a second access point receive an instruction of the access point control equipment, listen and detect the received signal strength from the mobile terminal, and feed back the detected received signal strength to the access point control equipment; and when the second received signal strength detected by the second access point is the maximum received signal strength which is greater than the first received signal strength, the access point control equipment cuts off the connection between the first access point and the mobile terminal, and only the silence flag of the second access point aiming at the mobile terminal in all the access points is in a closed state, so that the mobile terminal is automatically connected to the second access point.
Description
Technical Field
The present disclosure relates to the field of wireless communications, and in particular, to a wireless roaming method and system for a mobile terminal.
Background
In recent years, the demand for wireless communication quality has been increasing with the spread of wireless networks. Due to the limited wireless coverage of a single Access Point (AP), in some public places people use wireless networks, most terminal devices are moving, and wireless roaming is inevitably generated. In the roaming process, a terminal moves from one AP to another AP, and a roaming initiator and a roaming decision maker are generally decided by the terminal, so when the terminal roams and which access point to roam in an area covered by a network depends on the terminal, and the terminal is extremely important in the roaming process. When the roaming algorithm of the terminal cannot calculate the optimal roaming AP in the current network, the terminal may roam to the AP with poor signal strength or not roam, which may ultimately affect the internet experience of the user.
The existing method for improving the roaming of the mobile terminal and quickly selecting the strongest signal access point is to acquire the current position of the mobile terminal based on the communication between the mobile terminal and the AP in the target area when the mobile terminal moves in the target area; the current position of the mobile terminal is searched in the existing position table, the position table stores the corresponding relation between the target area and the optimal roaming AP, and when the mobile terminal moves to the target area, the mobile terminal is roamed to the roaming target AP. However, in the technical scheme, the position of a mobile terminal (STA) needs to be known in real time, and the position of the STA needs to be calculated in real time. On one hand, the technical scheme has complex algorithm and time consumption in calculation, and the three-dimensional space positioning needs more time, thereby influencing the roaming speed; on the other hand, the requirement on hardware is high, the clock crystal oscillator must have high precision, and the time consumed for receiving and sending messages is also inaccurate, so that the positioning is finally inaccurate; in addition, there are many points in the three-dimensional space, the background has many data to be stored, the requirement for storage space is large, the query takes time, otherwise, the finding of the AP is inaccurate under the condition of too little data.
Another way to improve the fast selection of the strongest signal access point for roaming of a mobile terminal is to detect, by a first access point of the plurality of access points, a signal strength of a signal from a mobile terminal wirelessly connected to the first access point, disconnect the mobile terminal from the first access point if the signal strength is less than an RSSI threshold, and notify the access point control device 100, whereby the connection state information is updated by the access point control device 100 to indicate that the mobile terminal is disconnected from the first access point, and transmit the connection state information of the mobile terminal to the plurality of access points, so that the mobile terminal is connected to a second access point of the plurality of access points. In this prior art scheme, when the RSSI value of the STA is smaller than the threshold, the current link is disconnected, and the RSSI threshold is selected, which is particularly important. It is possible that the RSSI values of different terminals at the same AP do not appear consistent at the same location, and the magnitude of the threshold becomes less well set by comparing the RSSI value with the threshold. One of the most important problems of this solution is to disconnect the current link when the RSSI value of the STA is smaller than the threshold, and if there is no AP with better signal strength waiting for the STA to access in the whole network at this time, which AP the STA should access? If the original AP is accessed, the action of disconnecting and reconnecting is redundant; if the AP with weaker signal is accessed, the internet surfing experience of the user is reduced.
It is therefore desirable to have a wireless roaming solution for mobile terminals that can roam to the AP with the strongest access signal strength at all times during roaming, without affecting the roaming functionality of the mobile terminal itself.
Disclosure of Invention
In order to solve one of the above problems in the prior art, according to an aspect of the present disclosure, there is provided a wireless roaming method for a mobile terminal, including: detecting, by a first access point connected to the mobile terminal, a first received signal strength from the mobile terminal and feeding back the detected first received signal strength to an access point control device; when the access point control equipment determines that the first received signal strength is smaller than the preset threshold value, other access points at least comprising a second access point receive an instruction of the access point control equipment, listen and detect the received signal strength from the mobile terminal, and feed back the detected received signal strength to the access point control equipment; and when the second received signal strength detected by the second access point is the maximum received signal strength which is greater than the first received signal strength, the access point control equipment cuts off the connection between the first access point and the mobile terminal, and only the silence flag of the second access point aiming at the mobile terminal in all the access points is in a closed state, so that the mobile terminal is automatically connected to the second access point.
The method for realizing the wireless roaming of the mobile terminal according to the disclosure further comprises the following steps: and when the other access points are in different channels with the first access point, receiving an instruction of the access point control equipment to switch the respective original channels to the channel same as the first access point for a preset time period so as to listen and detect the strength of the received signal from the mobile terminal in the preset time period.
The method for realizing the wireless roaming of the mobile terminal according to the disclosure further comprises the following steps: after the mobile terminal is connected to the second access point, the access point control equipment enables the silence flags of all the access points aiming at the mobile dispute to be in a closed state.
The method for realizing the wireless roaming of the mobile terminal according to the disclosure further comprises the following steps: after the other access points listen and detect the strength of the received signal from the mobile terminal within the predetermined time period, the access point control device instructs the other access points to recover their respective original channels.
The method for realizing the wireless roaming of the mobile terminal according to the disclosure further comprises the following steps: when the mobile terminal enters a coverage area controlled by the access point control equipment for the first time, the access point control equipment acquires the received signal strength of the mobile terminal intercepted and detected by all access points, and takes the average value of the received signal strengths of the top 4-8 bits in all the received signal strengths as the preset threshold value.
According to another aspect of the present disclosure, there is also provided a wireless roaming system for a mobile terminal, including a plurality of access points and an access point control device connected to the plurality of access points, wherein a first access point of the plurality of access points detects a first received signal strength from a mobile terminal with which a communication connection is established and feeds back the detected first received signal strength to the access point control device; the access point control equipment receives a message about first received signal strength sent by the first access point in real time and judges whether the first received signal strength is smaller than a preset threshold value or not; when the access point control device determines that the first received signal strength is smaller than the predetermined threshold value, the other access points at least comprising the second access point in the plurality of access points receive an instruction of the access point control device so as to listen and detect the received signal strength from the mobile terminal and feed back the detected received signal strength to the access point control device; and when the second received signal strength detected by the second access point is the maximum received signal strength which is greater than the first received signal strength, the access point control equipment cuts off the connection between the first access point and the mobile terminal, and only the silence flag of the second access point aiming at the mobile terminal in all the access points is in a closed state, so that the mobile terminal is automatically connected to the second access point.
According to the wireless roaming system for the mobile terminal, when the access point control device determines that the first received signal strength is smaller than the preset threshold value, if the other access points are in different channels with the first access point, the other access points are instructed to be switched to the same channel with the first access point from the respective original channels for a preset time length, so that the received signal strength from the mobile terminal is intercepted and detected in the preset time length.
According to the wireless roaming system for the mobile terminal, the access point control device instructs all the access points to be in a closed state aiming at the silence mark of the mobile dispute after the mobile terminal is connected to the second access point.
According to the wireless roaming system for the mobile terminal of the present disclosure, the access point control device instructs the other access points to recover their respective original channels after the other access points listen for and detect the received signal strength from the mobile terminal within the predetermined time period.
According to the wireless roaming system for the mobile terminal, when the mobile terminal enters the coverage area controlled by the access point control device for the first time, the access point control device obtains the received signal strength of the mobile terminal intercepted and detected by all access points, and takes the average value of the received signal strengths of the top 4-8 bits of all the received signal strengths as the predetermined threshold value.
In summary, the wireless roaming system and method for mobile terminal according to the present disclosure does not change with the standards of different manufacturers. The AP access points can be efficiently and accurately provided in the same wireless network all the time, the internet speed can be effectively improved, and the wireless network use experience of users is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
For a better understanding of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
FIG. 1 illustrates an exemplary system environment for implementing a wireless roaming system for mobile terminals in accordance with the present disclosure;
fig. 2 illustrates an exemplary block diagram of a wireless roaming system for a mobile terminal according to the present disclosure.
Fig. 3 illustrates an example block diagram for implementing wireless roaming in accordance with an embodiment of this disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, a first could also be termed a second, and, similarly, a second could also be termed a first, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
Exemplary embodiments are described with reference to the accompanying drawings. Wherever convenient, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Although examples and features of the disclosed principles are described herein, modifications, adaptations, and other implementations are possible without departing from the spirit and scope of the disclosed embodiments.
The components and steps shown are set forth to illustrate the exemplary embodiments shown, and it is anticipated that ongoing technology development will change the manner in which particular functions are performed. These examples are presented herein for purposes of illustration and not of limitation. Moreover, the boundaries of the functional building blocks have been arbitrarily defined herein for the convenience of the description. Alternative boundaries can be defined so long as the specified functions and relationships thereof are appropriately performed. Alternatives (including equivalents, extensions, variations, deviations, etc. of those described herein) will be apparent to persons skilled in the relevant art(s) based on the teachings contained herein. Such alternatives fall within the scope and spirit of the disclosed embodiments.
FIG. 1 illustrates an exemplary system environment 100 for implementing methods and systems consistent with the present disclosure. As shown in fig. 1, a wireless coverage scene covers a WIFI signal in a partial area. There is shown an access point control device (AC) to which three Access Points (APs), such as AP1, AP2, and AP3, are connected. Three mobile terminals STA1, STA2, and STA3 are shown in fig. 1, each representing a mobile terminal's position during movement through the signal coverage area. Note that more APs may be connected to an AC as needed to cover greater WIFI signal coverage, and thus each AP is configured to share a SSID (service set identification). When a mobile terminal moves from the position of the mobile terminal STA1 to the position of the mobile terminal STA3, the mobile terminal will automatically roam to the AP with the strongest signal under the technical solution of the present disclosure. As shown in fig. 1, the mobile terminal STA gradually moves downward from the position of the mobile terminal STA1 in the direction indicated by the arrow. At this time, it is assumed that the mobile terminal STA initially connects with the first access point AP1 at the location of the mobile terminal STA 1. Then if the mobile terminal STA moves to the position of the STA2, if the RSSI of the mobile terminal STA at this time is larger than a predetermined RSSI threshold set in an access point control device (AC), the AC does not perform any control processing. On the contrary, if the RSSI of the mobile terminal STA is smaller than the predetermined RSSI threshold set in the access point control device (AC). This means that the RSSI of the mobile terminal STA does not meet the signal received strength requirements in the roaming case of the present disclosure. At this time, the AC, when it knows this, notifies all other access points AP managed by the AC to listen to the mobile terminal STA, detects the RSSI value from the mobile terminal STA, extracts the RSSI value in the message from the mobile terminal STA, and reports the extracted RSSI value to the AC. If the channels where the other APs AP are located are different from the channel where the mobile terminal STA is located, the AC, when knowing this, notifies all the APs managed by the AC, except the first AP1, to switch from the respective original channel to the channel where the mobile terminal STA is located for a predetermined length of time, so that all the other APs will listen to the channel where the mobile terminal STA is located within the predetermined length of time, detect the RSSI value from the mobile terminal STA, extract the RSSI value in the message from the mobile terminal STA, and report the extracted RSSI value to the AC. Then, the AC compares the first RSSI about the mobile terminal STA from the AP1 obtained by the AP report with the RSSI about the mobile terminal STA from other APs (for example, AP2 and AP3) one by one, if there is a second RSSI from other APs (in this case, the second AP2) which is greater than the first RSSI and is the largest RSSI among the RSSI from the other APs, the AC notifies the first AP1 to disconnect the link with the mobile terminal STA, and for the mobile terminal STA, other APs including the first AP1 except the second AP2 are silent to the other APs, and finally the mobile terminal STA will automatically connect to the second AP 2. On the contrary, even if the RSSI of the mobile terminal STA is smaller than the predetermined RSSI threshold set in the access point control device (AC), but the RSSI of the signal reception strength from any other AP is not larger than the RSSI of the first signal reception strength, the AC will not perform any processing, and thus the mobile terminal STA will continue to maintain the communication connection with the first access point AP 1. Therefore, the mobile terminal STA moves from the STA1 position to the STA2 position, roaming to the AP with the strongest signal at one time is realized, and an accurate and efficient roaming process is completed. Although the received signal strength detected by the second access point AP2 is referred to herein as the second received signal strength, in practice the received signal strength detected by any other access point may be referred to as the second received signal strength satisfying the above conditions.
Similarly, assuming that the mobile terminal has roamed to the second AP2 once, STA moves from STA2 to STA3 as the mobile terminal continues to move downward. If the second received signal strength RSSI of the mobile terminal STA at this time is larger than a predetermined RSSI threshold set in an access point control device (AC), the AC does not perform any control processing. On the contrary, if the second received signal strength RSSI of the mobile terminal STA is smaller than the predetermined RSSI threshold set in the access point control device (AC). This means that the instantaneous (and thus instantaneous) second received signal strength RSSI received by the mobile terminal STA from the second access point AP2 does not meet the signal received strength requirements in the roaming scenario of the present disclosure. At this time, the AC, when it knows this, notifies all other access points AP managed by the AC to listen to the mobile terminal STA, detects the RSSI value from the mobile terminal STA, extracts the RSSI value in the message from the mobile terminal STA, and reports the extracted RSSI value to the AC. At this time, if the channels where the other access points AP are located are different from the channel where the mobile terminal STA is located, the AC, when knowing this, notifies all the APs managed by the AC, except the second access point AP2, to switch from the respective original channel where the access point is located to the channel where the mobile terminal STA is located for a predetermined length of time, so that all the other APs will listen to the channel where the mobile terminal STA is located within the predetermined length of time, detect the RSSI value from the mobile terminal STA, extract the RSSI value in the message from the mobile terminal STA, and report the extracted RSSI value to the AC. Then, the AC compares the second RSSI about the mobile terminal STA from the AP2 obtained by the AP report with the RSSI about the mobile terminal STA from other APs (for example, AP1 and AP3) one by one, if there is a third RSSI from other APs (in this case, the third AP3) which is greater than the second RSSI and which is the largest RSSI among the RSSI from the other APs, the AC notifies the second AP2 to disconnect the link with the mobile terminal STA, and for the mobile terminal STA, other APs including the second AP2 except the third AP3 are silent to the other APs, and finally the mobile terminal STA will automatically connect to the third AP 3. On the contrary, even if the RSSI of the mobile terminal STA is smaller than the predetermined RSSI threshold set in the access point control device (AC), but the RSSI of the signal reception strength from any other AP is not larger than the second RSSI, the AC will not perform any processing, and thus the mobile terminal STA will continue to maintain the communication connection with the second access point AP 1. Therefore, the mobile terminal STA moves from the STA1 position to the STA3 position, the mobile terminal STA roams to the AP with the strongest signal again, and an accurate and efficient roaming process is completed.
Fig. 2 is a block diagram illustrating a wireless roaming system for a mobile terminal according to the present disclosure, and as shown in fig. 2, the wireless roaming system 10 includes an access point control apparatus 100 and a plurality of access points 200 connected to the access point control apparatus 100, which are respectively labeled as access points 200-1, 200-2, 200-3 … in fig. 2, and access points 200-n, and when a specific access point needs to be explicitly specified, a specific label is used, and when a specific access point does not need to be explicitly specified, the access point 200 is labeled and referred to within a coverage area of the plurality of access points 200. the access point control apparatus 100 manages access authentication of the mobile terminal 300. the access point control apparatus 100 includes a controller and a memory, such as the storage unit 110, the comparison unit 120, the instruction unit 130, and the transceiving unit 140, in the storage unit 110 of the access point control apparatus 100, an access control list (AC L) is stored, which includes information of the mobile terminal 300 registered or authenticated in the access point control apparatus 100 or the access point 200 and information of the access point 200 connected thereto, including an address of the mobile terminal 300, a signal strength of the access point, an example of the access point control apparatus 100, and the access point control list is one example:
TABLE 1
As shown in table 1, the access control list of the access point control device 100 manages the MAC address of the mobile terminal 300 accessed under each access point 200 to distinguish the identity information of each mobile terminal access point 200 and record the received signal strength RSSI of each mobile terminal access point 200 connected to the access point 200. Further, for the purposes of this disclosure, a corresponding silence flag is specifically set for each mobile terminal 300. When the silence flag of any mobile terminal 300 under an access point 200 is turned on, it means that the access point 200 has rejected that the mobile terminal 300 cannot automatically access the access point, or that the access point 200 does not respond to any connection message sent by the mobile terminal 300. Although table 1 shows only five columns of parameters, it may list other required parameters as needed, such as whether the mobile terminal is in a connected state and with which access point 200 is in a connected state, etc. The parameters in table 1 will be modified at any time with the state of the access point 200 and the state of the mobile terminal 300, and the access point control device 100 will broadcast such modifications and changes to all its access points 200.
As shown in fig. 2, the mobile terminal 300 may move from the coverage area of a first access point 200-1 to the coverage area of a second access point 200-2. Roaming between the coverage areas of two access points 200-1 and 200-2 is described below with reference to fig. 2 using mobile terminal 300 as an example. For example, the wireless mobile terminal 300 broadcasts to all the access points 200 at the beginning of entering the coverage area of all the access points 200 of the access point control device 100, and the broadcast message includes the self-identity information of the mobile terminal 300. All access points 200 may receive the identity information of the mobile terminal 300. But generally the access point 200 that is closer to the mobile terminal 300 will receive its identity information. In the case where the mobile terminal 300 has performed authentication with the access point control device 100, the access point 200 that receives the broadcast data packet may forward the broadcast packet to the access point control device 100, and may designate, based on the existing order in which the broadcast packets are received, that the access point 200 that received the broadcast packet first connects to the mobile terminal 300 first, or may designate, among all the access points 200 that receive the broadcast packet within a predetermined period of time, that the access point that detected the strongest received signal strength connects to the mobile terminal 300 first. To make the mobile roaming access decision of the present disclosure, the access point control device 100 may predetermine a received signal strength threshold T. The threshold may be adapted periodically in order to better accommodate the average signal strength within the range covered by the access point control device 100. For example, all the access points 200 may detect the RSSI of the mobile terminal 300 before the mobile terminal 300 enters the coverage area, and the access point control device 100 may take the average of 4 signals with the top strength ranking as the threshold T, or take the average of 6 signals with the top strength ranking as the threshold T, or take the average of the signals with the top 3-7 strengths ranking as the threshold T after receiving the RSSI reported by each access point 200. Subsequently, the access point controlling apparatus 100 periodically instructs all the access points 200 to perform a received signal strength detection for a certain mobile terminal 300, and again takes the average value as the threshold T in the above manner. The period is, for example, 1 hour, 2 hours or 4 hours. The determined threshold T will be assigned to each access point 200 so that the access point 200 itself can determine whether the access signal strength of the mobile terminal 300 connected thereto is below the threshold T. Alternatively, a different threshold may be set for each access point 300. For example, in table 1, access points 300 for different sequence numbers have different thresholds, RSSI _ gap1, RSSI _ gap 1. The same threshold may also be set for all access points 200.
As shown in fig. 2, it is assumed that the mobile terminal 300 first connects with the first access point 200-1. When the mobile terminal 300 moves from the position P1 to the position P3 in fig. 2, the mobile terminal 300 will automatically roam to the access point 200 with the strongest signal according to the technical solution of the present disclosure. As shown in fig. 2, the mobile terminal 300 gradually moves downward from the position P1 in the direction indicated by the arrow. During the continuous movement of the mobile terminal 300 to the position P2, the access point 200-1 connected to the mobile terminal 300 continuously listens and detects the RSSI of the mobile terminal through its listening unit 210. The parsing unit of the access point 200-1 will parse the message obtained from the mobile terminal 300 and obtain the received signal strength RSSI of the mobile terminal. If the comparing unit 230 of the access point 200-1 determines that the RSSI of the mobile terminal 300 is greater than the predetermined threshold T (RSSI _ gap1) set for the access point 200-1 in the access point control device 100(AC), the access point 200-1 will not send the relevant message to the access point control device 100, or will send the relevant message immediately, and the access point control device 100 will not trigger any instruction to perform any control processing. Alternatively, the access point 200 may report the detected received signal strength RSSI to the access point control apparatus 100, and the access point control apparatus 100 performs the comparison with the threshold value T. In contrast, if the RSSI of the mobile terminal 300 is smaller than the predetermined threshold value T (RSSI _ gap1) set in the access point control device 100 (AC). This means that the RSSI of the mobile terminal 300 does not meet the signal received strength requirements for the roaming case of the present disclosure. At this time, the access point control device 100, when it is informed of this, notifies all other access points 200 managed by it through its instruction unit 130 to listen to the mobile terminal 300, and detects the RSSI value from the mobile terminal 300. All the access points 200 analyze and extract the RSSI values in the messages from the mobile terminal 300 and report the extracted RSSI values to the access point control device 100. It should be noted that the channel on which the access point 200 is located may be different from the channel on which the mobile terminal 300 is located. If the channel where the other access point 200 is located is different from the channel where the mobile terminal 300 is located, the instruction unit 130 notifies all the access points 200 managed by the access point control device 100, except the first access point 200-1, of switching from the original channel where the access point 200 is located to the channel where the mobile terminal 300 is located for a predetermined length of time, so that all the other access points 200 will listen to the channel where the mobile terminal 300 is located within the predetermined length of time, detect the RSSI value from the mobile terminal 300, analyze the RSSI value in the message from the mobile terminal 300, and report the analyzed RSSI value to the access point control device 100. The predetermined length of time is not longer than the time taken by the conventional mobile terminal to autonomously switch the access point during roaming, for example, 10ms to 500ms, preferably within 50 ms. Typically in the less than 500ms case, the user of other mobile terminals originally linked to other access points 200 will not feel the interruption of the connection during the channel switching by other access points 200. When a plurality of mobile terminals 300 coexist, a plurality of mobile terminals may roam, and channels may be continuously switched. In order to avoid that the handover situations compete with each other, it is preferable to control the predetermined length of time within 100ms, for example 30ms, 40ms or 50 ms.
To this end, a roaming table also needs to be stored and maintained on each access point 200, and table 2 shows the roaming table for access points according to the present disclosure.
TABLE 2
If there is a second RSSI signal strength from other access points 200 (in this case, the second access point 200-2) that is greater than the first RSSI signal strength RSSI and is the largest RSSI signal strength RSSI from other access points 200, the instruction unit 130 of the access point control device 100 notifies the first access point 200-1 to disconnect from the mobile terminal 300, and at the same time modifies the silence flag F L g1 in the AC L table, which corresponds to other access points 200 including the first access point 200-1, to start and broadcast to each access point 200 so that the corresponding access point 200 modifies the RSSI flag in its table so that the RSSI table also modifies the RSSI flag so that the RSSI table is in a state where the RSSI flag F3820 g is greater than the RSSI table of the first access point 200, thereby making no RSSI signal strength RSSI table for the first access point 200 to connect to the mobile terminal 300, and thus no RSSI table for the access point 200 to automatically determine that the RSSI table is in a state where the first RSSI table is greater than the RSSI table of the RSSI table 200, thereby making no RSSI table for the access point 200 to continue to process RSSI messages from the mobile terminal 300, even if the RSSI table is in a state where no RSSI table is greater than the RSSI table for the RSSI table 200 g RSSI table 200, no RSSI table 200, thereby making no RSSI table, thereby making a communication signal strength message is set by which the RSSI table, thereby, no RSSI table, which is set for the RSSI table, no RSSI table.
As described above, the mobile terminal 300 moves from the position P1 to the position P2, and thus roams to the access point 200-2 with the strongest signal once, and an accurate and efficient roaming process is completed. Although the received signal strength detected by the second access point 200-2 is referred to herein as the second received signal strength, in practice the received signal strength detected by any other access point may be referred to as the second received signal strength satisfying the above conditions.
By adopting the wireless roaming system disclosed by the disclosure, in the wireless roaming decision process, the roaming decision function of the mobile terminal per se is invalid, because other access points are in a silent state at the moment, and the mobile terminal moving process is not successful when the current access point 200-1 is disconnected and an attempt is made to disassociate other access points 200. In addition, when the access signal strength of the mobile terminal is not less than the threshold T, when the mobile terminal moves to the coverage of the other access point 200 with stronger access signal, the roaming can be performed autonomously, and the connection is switched to the other access point 200 with stronger signal. Therefore, the autonomous roaming function of the mobile terminal does not conflict with the process of actively helping the access point to realize the roaming of the mobile terminal.
Fig. 3 is a flow diagram illustrating a method for wireless roaming of a mobile terminal according to the present disclosure. As shown in fig. 3, first, at step S310, the first access point 200-1 linked with the mobile terminal 300 detects a first received signal strength RSSI of the mobile terminal 300. Subsequently, at step S320, the first node, such as 200-1 or the access point control device 100, determines whether the detected first received signal strength RSSI of the mobile terminal 300 is less than a predetermined threshold T. If not, the process flow returns to step S310; if the first received signal strength RSSI is less than the predetermined threshold value T, the access point control apparatus 100 determines whether the other access points 200 except the first access point 200-1 are in the same channel as the first access point 200-1 at step S330. If both are in the same channel as that of the first access point 200-1, the access point control device 100 instructs all the access points 200 to listen and detect the received signal strength of the mobile terminal 300 for a predetermined period of time and acquires all the detected received signal strengths at step S340. If there is any access point 200 that is not in the same channel as the channel of the first access point 200-1, the access point control device 100 instructs the access points 200 to switch from their respective original channels to the channel for communication between the first access point 200-1 and the mobile terminal 300 at step S350, and the flow then proceeds to step S340. After step S340, the process proceeds to step S360. At step S360, the access point controlling apparatus 100 compares the received signal strengths of the mobile terminals 300 intercepted and detected by all the access points 200 within the predetermined period of time to determine whether any other received signal strengths are greater than the first received signal strength intercepted and detected by the first access point 200-1. If it is determined at step S360 that there is any other received signal strength greater than the first received signal strength sensed and detected by the first access point 200-1, the access point control device 100 may take the access point (e.g., the second access point 200-2) in which the maximum received signal strength is detected as a preference for the mobile terminal 300 to be roamed to connect at step S370. In order to connect the selected second access point 200-2 to the mobile terminal 300 smoothly, at step S380, the access point control device 100 sets the silence flag of the other access points 200 except the second access point 200-2 in the access control table for the mobile terminal to be on, so that the other access points 200 cannot acquire any data packet of the mobile terminal 300, thereby enabling the mobile terminal 300 to link to the second access point 200-2 only. The second access point 200-2 is now at the original location of the first access point 200-1 in the process flow. The flow returns to step S310. Thus, the mobile terminal passively performs wireless roaming by repeating the control of the access point 200 by the access point control apparatus 100.
By adopting the wireless roaming method disclosed by the disclosure, in the wireless roaming decision process, the own roaming decision function of the mobile terminal is invalid, because other access points are in a silent state at the moment, and the mobile terminal will not succeed when the current access point 200-1 is disconnected and trying to disassociate other access points 200 autonomously in the mobile process. In addition, when the access signal strength of the mobile terminal is not less than the threshold T, when the mobile terminal moves to the coverage of the other access point 200 with stronger access signal, the roaming can be performed autonomously, and the connection is switched to the other access point 200 with stronger signal. Therefore, the autonomous roaming function of the mobile terminal does not conflict with the process of actively helping the access point to realize the roaming of the mobile terminal.
Thus, the objects of the present disclosure may also be achieved by running a program or a set of programs on any computing device. The computing device may be a general purpose device as is well known. Thus, the object of the present disclosure can also be achieved merely by providing a program product containing program code for implementing the method or apparatus. That is, such a program product also constitutes the present disclosure, and a storage medium storing such a program product also constitutes the present disclosure. It is to be understood that the storage medium may be any known storage medium or any storage medium developed in the future.
It is also noted that in the apparatus and methods of the present disclosure, it is apparent that individual components or steps may be disassembled and/or re-assembled. These decompositions and/or recombinations are to be considered equivalents of the present disclosure. Also, the steps of executing the series of processes described above may naturally be executed chronologically in the order described, but need not necessarily be executed chronologically. Some steps may be performed in parallel or independently of each other. The above detailed description should not be construed as limiting the scope of the disclosure. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions can occur, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present disclosure should be included in the scope of protection of the present disclosure.
Claims (10)
1. A wireless roaming method for a mobile terminal, comprising:
detecting, by a first access point connected to the mobile terminal, a first received signal strength from the mobile terminal and feeding back the detected first received signal strength to an access point control device;
when the access point control equipment determines that the first received signal strength is smaller than the preset threshold value, other access points at least comprising a second access point receive an instruction of the access point control equipment, listen and detect the received signal strength from the mobile terminal, and feed back the detected received signal strength to the access point control equipment; and
when the second received signal strength detected by the second access point is the maximum received signal strength greater than the first received signal strength, the access point control device cuts off the connection between the first access point and the mobile terminal, and only the silence flag of the second access point for the mobile terminal in all the access points is in a closed state, so that the mobile terminal is automatically connected to the second access point.
2. The method of enabling mobile terminal wireless roaming according to claim 1, further comprising:
and when the other access points are in different channels with the first access point, receiving an instruction of the access point control equipment to switch the respective original channels to the channel same as the first access point for a preset time period so as to listen and detect the strength of the received signal from the mobile terminal in the preset time period.
3. The method for implementing wireless roaming of a mobile terminal according to claim 1 or 2, further comprising:
after the mobile terminal is connected to the second access point, the access point control equipment enables the silence flags of all the access points aiming at the mobile dispute to be in a closed state.
4. The method of enabling mobile terminal wireless roaming according to claim 2, further comprising:
after the other access points listen and detect the strength of the received signal from the mobile terminal within the predetermined time period, the access point control device instructs the other access points to recover their respective original channels.
5. The method of enabling mobile terminal wireless roaming according to claim 1, further comprising:
when the mobile terminal enters a coverage area controlled by the access point control equipment for the first time, the access point control equipment acquires the received signal strength of the mobile terminal intercepted and detected by all access points, and takes the average value of the received signal strengths of the top 4-8 bits in all the received signal strengths as the preset threshold value.
6. A wireless roaming system for a mobile terminal, comprising a plurality of access points and an access point control device connected to the plurality of access points, wherein,
a first access point of the plurality of access points detects a first received signal strength from a mobile terminal with which a communication connection is established, and feeds back the detected first received signal strength to the access point control device;
the access point control equipment receives a message about first received signal strength sent by the first access point in real time and judges whether the first received signal strength is smaller than a preset threshold value or not;
when the access point control device determines that the first received signal strength is smaller than the predetermined threshold value, the other access points at least comprising the second access point in the plurality of access points receive an instruction of the access point control device so as to listen and detect the received signal strength from the mobile terminal and feed back the detected received signal strength to the access point control device; and
when the second received signal strength detected by the second access point is the maximum received signal strength greater than the first received signal strength, the access point control device cuts off the connection between the first access point and the mobile terminal, and only the silence flag of the second access point for the mobile terminal in all the access points is in a closed state, so that the mobile terminal is automatically connected to the second access point.
7. The wireless roaming system for the mobile terminal of claim 6, wherein the access point control device instructs the other access points to switch from their respective original channels to the same channel as the first access point for a predetermined period of time to listen for and detect the received signal strength from the mobile terminal for the predetermined period of time if the other access points are on different channels from the first access point when it is determined that the first received signal strength is less than the predetermined threshold.
8. The wireless roaming system for mobile terminal of claim 1 or 2, wherein the access point control device instructs all access points to be in off state for silence flag of the mobile dispute after the mobile terminal connects to the second access point.
9. The wireless roaming system for mobile terminals of claim 7, wherein the access point control device instructs the other access points to recover their respective original channels after the other access points listen and detect received signal strength from the mobile terminal for the predetermined period of time.
10. The wireless roaming system for mobile terminal according to claim 1, wherein the access point control device obtains received signal strengths of the mobile terminal intercepted and detected by all access points when the mobile terminal enters a coverage area controlled by the initial access point control device, and takes an average value of received signal strengths of top 4-8 bits of all received signal strengths as the predetermined threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010282076.3A CN111491352A (en) | 2020-04-11 | 2020-04-11 | Wireless roaming method and system for mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010282076.3A CN111491352A (en) | 2020-04-11 | 2020-04-11 | Wireless roaming method and system for mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111491352A true CN111491352A (en) | 2020-08-04 |
Family
ID=71811789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010282076.3A Pending CN111491352A (en) | 2020-04-11 | 2020-04-11 | Wireless roaming method and system for mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111491352A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112040470A (en) * | 2020-09-14 | 2020-12-04 | 普联技术有限公司 | Roaming evaluation method, network management equipment and access point equipment |
| CN112188581A (en) * | 2020-09-09 | 2021-01-05 | 锐捷网络股份有限公司 | Wireless access point switching processing method, device, medium and equipment |
| CN113259853A (en) * | 2020-12-23 | 2021-08-13 | 南京熊猫电子股份有限公司 | Method and system for automatically identifying mobile phone roaming place of driver and passenger |
| CN113489556A (en) * | 2021-07-08 | 2021-10-08 | 维沃移动通信有限公司 | Signal receiving method, signal receiving device, electronic equipment and storage medium |
| CN113993165A (en) * | 2021-09-10 | 2022-01-28 | 新华三信息安全技术有限公司 | Wireless local area network load management method, device and system |
| CN114205756A (en) * | 2021-11-04 | 2022-03-18 | 锐捷网络股份有限公司 | Roaming method and device of wireless terminal |
| CN116567753A (en) * | 2023-07-06 | 2023-08-08 | 深圳智慧光迅信息技术有限公司 | Wireless roaming method, system, computer equipment and storage medium |
| CN117119497A (en) * | 2023-10-20 | 2023-11-24 | 四川长虹新网科技有限责任公司 | Easymesh switching efficiency evaluation method |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101583151A (en) * | 2009-07-02 | 2009-11-18 | 杭州华三通信技术有限公司 | Method of STA roaming in WLAN network and device |
| CN102833824A (en) * | 2012-08-30 | 2012-12-19 | 福建星网锐捷网络有限公司 | Access method and device for wireless local area network and network equipment |
| CN102883301A (en) * | 2012-09-20 | 2013-01-16 | 福建星网锐捷网络有限公司 | Method and device for forcing client to roam and access controller |
| CN103686890A (en) * | 2012-09-07 | 2014-03-26 | 中兴通讯股份有限公司 | Method and system for realizing wireless terminal roaming switch in wireless local area network |
| CN104853391A (en) * | 2015-03-17 | 2015-08-19 | 杭州华三通信技术有限公司 | Terminal wake-up method and access point AP |
| CN105657734A (en) * | 2016-02-23 | 2016-06-08 | 深圳市共进电子股份有限公司 | Wireless intelligent roaming method, system and device |
| CN106304225A (en) * | 2015-06-02 | 2017-01-04 | 中兴通讯股份有限公司 | A kind of roaming switch control method and central control unit |
| CN106535155A (en) * | 2016-10-14 | 2017-03-22 | 上海斐讯数据通信技术有限公司 | Method, device and system for performing wireless roaming of wireless terminal |
| CN107113641A (en) * | 2014-12-17 | 2017-08-29 | 汤姆逊许可公司 | WLAN user Quality of experience is controlled in multi-access point environment |
| CN107295559A (en) * | 2017-08-17 | 2017-10-24 | 迈普通信技术股份有限公司 | Terminal roaming management method and access control equipment |
| CN107635257A (en) * | 2016-07-18 | 2018-01-26 | 中国电信股份有限公司 | Wireless extensions loaming method and system, home gateway and wireless access points |
| CN108235395A (en) * | 2018-01-10 | 2018-06-29 | 重庆邮电大学 | It is a kind of to realize wireless terminal in a wlan across the method for channel roaming switch |
| CN109922469A (en) * | 2017-12-12 | 2019-06-21 | 桂花网科技有限公司 | For supporting the method, apparatus and system of radio roaming |
-
2020
- 2020-04-11 CN CN202010282076.3A patent/CN111491352A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101583151A (en) * | 2009-07-02 | 2009-11-18 | 杭州华三通信技术有限公司 | Method of STA roaming in WLAN network and device |
| CN102833824A (en) * | 2012-08-30 | 2012-12-19 | 福建星网锐捷网络有限公司 | Access method and device for wireless local area network and network equipment |
| CN103686890A (en) * | 2012-09-07 | 2014-03-26 | 中兴通讯股份有限公司 | Method and system for realizing wireless terminal roaming switch in wireless local area network |
| CN102883301A (en) * | 2012-09-20 | 2013-01-16 | 福建星网锐捷网络有限公司 | Method and device for forcing client to roam and access controller |
| CN107113641A (en) * | 2014-12-17 | 2017-08-29 | 汤姆逊许可公司 | WLAN user Quality of experience is controlled in multi-access point environment |
| CN104853391A (en) * | 2015-03-17 | 2015-08-19 | 杭州华三通信技术有限公司 | Terminal wake-up method and access point AP |
| CN106304225A (en) * | 2015-06-02 | 2017-01-04 | 中兴通讯股份有限公司 | A kind of roaming switch control method and central control unit |
| CN105657734A (en) * | 2016-02-23 | 2016-06-08 | 深圳市共进电子股份有限公司 | Wireless intelligent roaming method, system and device |
| CN107635257A (en) * | 2016-07-18 | 2018-01-26 | 中国电信股份有限公司 | Wireless extensions loaming method and system, home gateway and wireless access points |
| CN106535155A (en) * | 2016-10-14 | 2017-03-22 | 上海斐讯数据通信技术有限公司 | Method, device and system for performing wireless roaming of wireless terminal |
| CN107295559A (en) * | 2017-08-17 | 2017-10-24 | 迈普通信技术股份有限公司 | Terminal roaming management method and access control equipment |
| CN109922469A (en) * | 2017-12-12 | 2019-06-21 | 桂花网科技有限公司 | For supporting the method, apparatus and system of radio roaming |
| CN108235395A (en) * | 2018-01-10 | 2018-06-29 | 重庆邮电大学 | It is a kind of to realize wireless terminal in a wlan across the method for channel roaming switch |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112188581A (en) * | 2020-09-09 | 2021-01-05 | 锐捷网络股份有限公司 | Wireless access point switching processing method, device, medium and equipment |
| CN112040470B (en) * | 2020-09-14 | 2023-08-08 | 普联技术有限公司 | Roaming evaluation method, network management equipment and access point equipment |
| CN112040470A (en) * | 2020-09-14 | 2020-12-04 | 普联技术有限公司 | Roaming evaluation method, network management equipment and access point equipment |
| CN113259853A (en) * | 2020-12-23 | 2021-08-13 | 南京熊猫电子股份有限公司 | Method and system for automatically identifying mobile phone roaming place of driver and passenger |
| CN113259853B (en) * | 2020-12-23 | 2024-03-01 | 南京熊猫电子股份有限公司 | Method and system for automatically identifying mobile phone roaming places of drivers and passengers |
| CN113489556A (en) * | 2021-07-08 | 2021-10-08 | 维沃移动通信有限公司 | Signal receiving method, signal receiving device, electronic equipment and storage medium |
| CN113993165B (en) * | 2021-09-10 | 2023-08-25 | 新华三信息安全技术有限公司 | Wireless local area network load management method, device and system |
| CN113993165A (en) * | 2021-09-10 | 2022-01-28 | 新华三信息安全技术有限公司 | Wireless local area network load management method, device and system |
| WO2023078341A1 (en) * | 2021-11-04 | 2023-05-11 | 锐捷网络股份有限公司 | Roaming method and apparatus for wireless terminal |
| CN114205756A (en) * | 2021-11-04 | 2022-03-18 | 锐捷网络股份有限公司 | Roaming method and device of wireless terminal |
| CN114205756B (en) * | 2021-11-04 | 2024-03-19 | 锐捷网络股份有限公司 | Roaming method and device for wireless terminal |
| CN116567753A (en) * | 2023-07-06 | 2023-08-08 | 深圳智慧光迅信息技术有限公司 | Wireless roaming method, system, computer equipment and storage medium |
| CN117119497A (en) * | 2023-10-20 | 2023-11-24 | 四川长虹新网科技有限责任公司 | Easymesh switching efficiency evaluation method |
| CN117119497B (en) * | 2023-10-20 | 2023-12-22 | 四川长虹新网科技有限责任公司 | Easymesh switching efficiency evaluation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111491352A (en) | Wireless roaming method and system for mobile terminal | |
| JP4602967B2 (en) | Wireless local access network system detection and selection | |
| CN101282264B (en) | Wireless local access network system detection and selection | |
| EP3236692B1 (en) | Method for triggering terminal handover by access point | |
| EP1597868B1 (en) | Wireless local access network system detection and selection | |
| EP1956860B1 (en) | Wireless lan network, and mobile station, base station and method of controlling handoff in wireless lan network | |
| US8023468B2 (en) | Methods, device and system for access point facilitated fast handoff | |
| EP3001734B1 (en) | System, program and method for radio terminal to find access point | |
| CN110677886B (en) | Wireless communication access network switching scheduling method facing edge computing environment | |
| US10034221B2 (en) | Method for establishing backhaul link, base station, relay node, and system | |
| US9635693B2 (en) | Method of performing pairing between coordinator and device in network, method of performing pairing between devices, method of pairing between coordinators and network system including the coordinators and the devices | |
| CN110602704A (en) | Non-sensing roaming system and method | |
| CN102752755A (en) | Wireless access point switching method | |
| US9084164B2 (en) | Wireless LAN system, wireless LAN access point, handover execution method and program | |
| CN109104762B (en) | Method and device for adjusting WLAN network frame transmitting power | |
| US20100302981A1 (en) | Method and apparatus for roaming in a wireless network | |
| US20230171687A1 (en) | Wireless roaming method and system | |
| US20140362771A1 (en) | Apparatus and method for controlling local area communication connection by means of wireless terminal device | |
| CN101541054B (en) | Method for obtaining target base station trigger message, device and system thereof | |
| CN108024298B (en) | Method and device for controlling terminal to actively roam | |
| Hans et al. | Wi-Fi roaming as a location-based service | |
| KR101422717B1 (en) | Method and device for handoff of wireless communication system | |
| KR20170119228A (en) | Method and apparatus for controlling connection of mobile communication terminal | |
| JP6034587B2 (en) | Mobile terminal and communication method | |
| CN118055522A (en) | Communication method, target terminal and communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200804 |