CN113905424A

CN113905424A - Optimization system and device for switching between WiFi and cellular network

Info

Publication number: CN113905424A
Application number: CN202111133021.7A
Authority: CN
Inventors: 雷永成; 高翔; 于杰; 迟景立
Original assignee: Chengdu Xijia Spruce Network Co ltd; Nanjing Nasheyi Technology Co ltd; Jiangsu Kexin Intelligent Education Research Institute Co ltd
Current assignee: Chengdu Xijia Spruce Network Co ltd; Nanjing Nasheyi Technology Co ltd; Jiangsu Kexin Intelligent Education Research Institute Co ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-01-07

Abstract

The invention discloses an optimization system and a device for switching between WiFi and cellular networks, which belong to the technical field of switching between the WiFi and the cellular networks and comprise the following steps: s1: terminal access control: s2: and (3) correlation filtering: s3: judging a connection scene: s4: the user connection is interrupted. According to the optimization system and device for switching between the WiFi and the cellular network, the AP can actively interrupt the connection with the user, bandwidth resources are optimized, the WiFi network is changed into the optimal network which is always accessed as a result of the best effort, the user experience is greatly improved while the network resources are reasonably utilized, the QoS network environment is configured, the predictability of the network performance is improved, the network bandwidth can be effectively distributed, the network resources are more reasonably utilized, and the signal receiver is additionally arranged on the outer side of the outer protection box body, so that the signals can be conveniently and stably received and transmitted, and the signal transmission efficiency is improved.

Description

Optimization system and device for switching between WiFi and cellular network

Technical Field

The present invention relates to the field of WiFi and cellular network handover technologies, and in particular, to an optimization system and apparatus for handover between WiFi and cellular networks.

Background

In general, the mobile terminal device selects a WiFi Best Effort mode (Best Effort) to access the network according to a Wi-Fi priority principle (Wi-Fi First). Only when the Wi-Fi network cannot be accessed, the terminal is switched to the public wireless cellular network, Wi-Fi priority can cause that the user experience is influenced by the fact that the terminal equipment ignores the network with poor network resource access condition, wherein the ANDSF server side can collect the network condition of the cellular base station side and the QoE condition of the WiFi side and then inform the terminal side of the information; the terminal side can decide to take part of the service away from the WiFi and part of the service still away from the cellular network according to the service requirement, and the existing WiFi usage has the following disadvantages:

1. the Wi-Fi network still selects to access the WiFi network under the condition of overload (overloaded);

2. when the cellular network quality is better (such as larger bandwidth, faster network speed and the like), the Wi-Fi network is still selected to be accessed;

3. the terminal continuously tries to access some temporary WiFi networks (for example, when passing through some public WiFi hotspots), so that the terminal continuously performs handover between the cellular network and the WiFi network;

4. in practical situations, the current concepts of ANDSF are supported by few technologies at the industrial level, since the final implementation of the roaming selection from cellular networks to WiFi requires the terminal side to complete.

Disclosure of Invention

The invention aims to provide an optimization system and device for switching between WiFi and cellular networks, which can greatly improve user experience while reasonably utilizing network resources, configure a QoS network environment, increase the predictability of network performance, effectively allocate network bandwidth, more reasonably utilize the network resources, facilitate stable signal receiving and transmission by additionally arranging a signal receiver outside an outer protective box body, improve the signal transmission efficiency and solve the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

an optimization system for handover between WiFi and cellular networks, comprising the steps of:

s1: terminal access control: the AP judges whether the current WiFi network quality supports the user APP according to the signal-to-noise ratio, the current network quality, the terminal negotiation rate and the APP QoS requirement, and determines whether to share the flow through the WiFi network;

s2: and (3) correlation filtering: according to the QoE evaluation result, under the condition of following the QoS rule of the terminal user, the AC can judge whether enough bandwidth resources are allocated to the terminal, so as to decide whether the terminal is allowed to access;

s3: judging a connection scene: when the AC receives a terminal connection request and judges that enough bandwidth is allocated to the terminal through a QoE evaluation result, the AC sends a connection response to the terminal through the AP within 50 milliseconds, starts an authentication process, finally completes connection, and stores connection data obtained from the AP in the AC;

s4: and (3) interrupting user connection: the AP monitors the connection state between the accessed terminal networks in real time, and when the connection quality is poor, the AP can actively interrupt the connection with the user and optimize bandwidth resources.

Further, in S1, the method includes the following steps:

s101: when receiving the connection request, the AP can obtain the signal-to-noise ratio by detecting the receiving packet and obtain the terminal negotiation rate from the connection request message;

s102: under a common channel, estimating the data transmission rate required by the terminal according to the signal-to-noise ratio;

s103: the AP continuously detects the channel occupancy rate and calculates the average transmission time which can be allocated to the user according to the channel occupancy rate;

s104: and the AP transmits the information to the AC through a CAPWAP channel and performs QoE evaluation.

Further, the QoS technology in S2 includes flow classification, flow supervision, flow shaping, interface speed limiting, congestion management, congestion avoidance, and the like;

and (3) flow classification: identifying the message according with certain characteristics by adopting a certain rule, which is the premise and the basis for carrying out differentiated service on network services;

flow supervision: the specific flow entering or exiting the equipment is monitored, and when the flow exceeds a set value, a limiting or punishing measure can be taken to protect network resources from being damaged and can act on the entering direction and the exiting direction of an interface;

and (3) flow shaping: a flow control measure for actively adjusting the output rate of a flow is used for adapting the flow to network resources which can be supplied by downstream equipment, avoiding unnecessary message discarding and delay, and generally acting in the interface output direction;

and (3) congestion management: when congestion occurs, how to make a resource scheduling strategy to determine the processing sequence of message forwarding, which is usually applied to the interface outgoing direction;

congestion avoidance: the method monitors the use condition of network resources, adopts a strategy of actively discarding messages when finding that congestion tends to be aggravated, and relieves the overload of the network by adjusting the length of a queue, and generally acts on an interface outgoing side.

Further, in S3, in a normal connection scenario, after the AC receives the terminal connection request and determines that there is enough bandwidth allocated to the terminal according to the QoE evaluation result, the AC sends a connection response to the terminal through the AP within 50 milliseconds, starts an authentication process, finally completes the connection, and stores connection data obtained from the AP in the AC.

Further, for the weak signal scenario in S3, when the QoE measures that there is not enough bandwidth allocated to the end user under the current network conditions, the AC sends a response to the terminal device through the AP, and rejects the device to access the network, and the connection process is terminated, at which point the terminal may select to access another network by itself.

Further, for S4: when the terminal accesses the WiFi network, the AP monitors the RSSI of the terminal in real time and compares the RSSI with a threshold value, and when the RSSI is detected to be more than or equal to the threshold value, the network condition is good, and the AP keeps connection with the terminal; when the terminal moves to a WiFi signal weaker or no-signal area, the RSSI is reduced and is smaller than a threshold value, the AP actively interrupts the connection with the terminal, the terminal searches again and accesses other networks at the moment, and in addition, when the terminal which is normally connected with the network and the AP do not have data transmission for a long time, the AP actively sends a response request message to the terminal and decides to maintain or interrupt the connection with the equipment according to the response condition.

Further, for S4: in actual operation, usually-75 dBm is selected as an RSSI threshold, which can be set by an AC and issued to an AP, and when a terminal device moves to an area with a poor network signal, the RSSI value gradually decreases to less than-75 dBm as the signal weakens, and at this time, the AP actively interrupts the network connection with the terminal and returns a connection termination report to the AC.

Further, for S4: when data transmission does not exist between terminal equipment which is normally connected with a WiFi network and the AP for a long time, the AP can actively send a detection request to the terminal, when the WiFi network signal is poor, the mobile phone terminal can actively send a QoS NULL message to the AP to confirm the connection condition, and when the AP continuously detects that the RSSI of the terminal QoS NULL message is less than-75 dBm, the detection request can be sent to the mobile phone terminal.

Further, the device comprises an outer protection box body, wherein a signal receiver is connected above the outer protection box body, a main processing unit, an access unit, an evaluation unit, a judgment unit and an interruption control unit are arranged in the outer protection box body, and the access unit, the evaluation unit, the judgment unit and the interruption control unit are all electrically connected with the main processing unit.

Furthermore, the access unit accesses the terminal user through the signal receiver, and the judgment result is fed back to the general processing unit by the judgment unit after the evaluation unit evaluates the accessed terminal user.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides an optimizing system and a device for switching between WiFi and cellular networks, wherein an AP actively sends a detection request to a terminal, when the WiFi network signal is poor, a mobile phone terminal actively sends a QoS NULL message to the AP to confirm the connection condition, when the AP continuously detects that the RSSI of the terminal QoS NULL message is less than-75 dBm, the mobile phone terminal sends the detection request, aiming at the irrational property that the terminal selects to access and switch the network under the WiFi priority principle, the QoE Control technology allows the AP to synthesize various conditions, accepts or rejects the network access request of the mobile terminal to reasonably distribute bandwidth resources, simultaneously, the AP realizes the real-time monitoring of the connection state between accessed terminal networks, when the connection quality is poor, the AP can actively interrupt the connection with the user, optimizes the bandwidth resources, and the mode when the mobile terminal accesses the network is changed from the WiFi network to the always optimal network through SKS QoE Control, the network resource is reasonably utilized, user experience is greatly improved, the network environment of QoS is configured, the predictability of network performance is improved, the network bandwidth can be effectively distributed, the network resource is more reasonably utilized, the signal receiver is additionally arranged on the outer side of the outer protection box body, signals are conveniently and stably received and transmitted, and the signal transmission efficiency is improved.

Drawings

FIG. 1 is a flow chart of the present invention;

FIG. 2 is a process diagram of a terminal access control according to the present invention;

FIG. 3 is a QoS technology block diagram of the present invention;

FIG. 4 is a schematic structural diagram of an outer protective casing according to the present invention;

FIG. 5 is a block diagram of the system connection inside the outer protective casing of the present invention.

In the figure: 1. an outer protective box body; 11. a signal receiver; 12. a total processing unit; 13. an access unit; 14. an evaluation unit; 15. a judgment unit; 16. and interrupting the control unit.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Referring to fig. 1-2, an optimization system and apparatus for handover between WiFi and cellular networks includes the following steps:

The AP active switching type equalization algorithm at the network side judges whether the AP accepts a request of a new terminal for accessing the network or not according to a QoE evaluation result, bandwidth resources are allocated to the new access terminal, for a terminal accessed to a WiFi network, the AP monitors the strength of a signal received by the terminal in real time to judge the connection quality of the terminal, so that the AP decides to continue to maintain or interrupt the connection with the equipment, and in the scenes of normal connection, weak signals, no signals and the like, the AP realizes the control of the terminal access through QoE evaluation and associated filtering, and simultaneously, the AP detects the RSSI of the accessed network terminal in real time and compares the RSSI with a preset threshold value to judge the connection quality of the terminal, so that the AP decides to continue to maintain or interrupt the connection with the equipment.

The method comprises the following steps:

Referring to fig. 3, the QoS technology includes flow classification, flow supervision, flow shaping, interface speed limitation, congestion management, congestion avoidance, and the like;

The network environment with QoS is configured, so that the predictability of the network performance is improved, the network bandwidth can be effectively distributed, and the network resources are more reasonably utilized.

In a normal connection scene, when an AC receives a terminal connection request and judges that enough bandwidth is allocated to a terminal according to a QoE evaluation result, the AC sends a connection response to the terminal through an AP within 50 milliseconds, an authentication process is started, connection is finally completed, connection data obtained from the AP is stored in the AC, when the QoE evaluation current network condition does not have enough bandwidth to be allocated to a terminal user, the AC sends a response to terminal equipment through the AP, the equipment is refused to access a network, the connection process is terminated, the terminal can automatically select to access other networks at the moment, when the AP receives feedback response information (Ack Message) of the terminal aiming at NULL Probe and detects the RSSI < -75dBm, the AP continuously sends 5 groups of NULL probes but does not receive but responds to the terminal, the AP actively interrupts network connection with the terminal, and when the terminal accesses a WiFi network, the AP monitors the RSSI of the terminal in real time and compares the RSSI with a threshold value, when the RSSI is detected to be more than or equal to the threshold value, the network condition is good, and the AP keeps connection with the terminal; when the terminal moves to a WiFi signal weaker or no-signal area, RSSI is reduced and is smaller than a threshold value, the AP actively interrupts the connection with the terminal, the terminal searches again and accesses other networks, when the AP receives feedback response information (Ack Message) of the terminal aiming at the NULL Probe and detects that the RSSI is less than-75 dBm, the AP continuously sends 5 groups of NULL probes without receiving the feedback response information and responds to the terminal, the AP actively interrupts the network connection with the terminal, when the terminal does not normally acquire an IP address after being associated with the AP, although the AP detects that the RSSI is more than or equal to-75 dBm, the AP still interrupts the connection with the terminal when a DHCP address release timer expires, in addition, when no data transmission exists between the terminal which is normally connected with the network and the AP for a long time, the AP actively sends a response request Message to the terminal and decides to maintain or interrupt the connection with the equipment according to the response condition, in actual operation, usually-75 dBm is selected as RSSI threshold value, the threshold value can be set by AC and issued to AP, when terminal equipment moves to an area with poor network signal, RSSI value is gradually reduced to below-75 dBm along with the weakening of signal, AP will actively interrupt the network connection with the terminal at this moment and send back the connection termination report to AC, when there is no data transmission between terminal equipment which is normally connected with WiFi network and AP for a long time, AP will actively send detection request to terminal, when WiFi network signal is poor, mobile phone terminal will actively send QoS NULL message to AP to confirm the connection status, when AP continuously detects that terminal QoS NULL message RSSI is less than-75 QoBm, the detection request will be sent to mobile phone terminal, irrational terminal selection access and network switching under WiFi priority principle, E control technology allows AP to synthesize various conditions, accept or reject the network access request of mobile terminal, the method has the advantages that the bandwidth resources are reasonably distributed, meanwhile, the AP monitors the connection state between the accessed terminal networks in real time, when the connection quality is poor, the AP can actively interrupt the connection with the user, the bandwidth resources are optimized, the mode that the mobile terminal accesses the network is changed into the mode that the WiFi network is always accessed into the optimal network through the SKS QoE Control, and the user experience is greatly improved while the network resources are reasonably utilized.

Please refer to fig. 4-5, which includes an outer protective box 1, a signal receiver 11 is connected above the outer protective box 1, a general processing unit 12, an access unit 13, an evaluation unit 14, a judgment unit 15 and an interrupt control unit 16 are disposed inside the outer protective box 1, the access unit 13, the evaluation unit 14, the judgment unit 15 and the interrupt control unit 16 are all electrically connected to the general processing unit 12, the access unit 13 accesses a terminal user through the signal receiver 11, and the judgment result is fed back to the general processing unit 12 by the judgment unit 15 after the evaluation unit 14 evaluates the accessed terminal user, and by additionally installing the signal receiver 11 outside the outer protective box 1, stable signal receiving and transmission are facilitated, and signal transmission efficiency is improved.

In summary, the present invention provides an optimizing system and apparatus for switching between WiFi and cellular networks, wherein an AP actively sends a probe request to a terminal, when a WiFi network signal is poor, a mobile terminal actively sends a QoS NULL message to the AP to confirm a connection status, when the AP continuously detects that a QoS NULL message RSSI is less than-75 dBm, the AP sends the probe request to the mobile terminal, and the QoS NULL message is selected to access and switch the network irrational according to the WiFi priority principle, a QoE Control technique allows the AP to integrate various conditions, and accepts or rejects the network access request of the mobile terminal to reasonably allocate bandwidth resources, and simultaneously, the AP monitors the connection status between the accessed terminals in real time, when the connection quality is poor, the AP can actively interrupt the connection with the user to optimize the bandwidth resources, and access the network by using SKS QoE Control, the WiFi network is changed into the optimal network which is accessed all the time in a best effort mode, the user experience is greatly improved while the network resources are reasonably utilized, the network environment of QoS is configured, the predictability of the network performance is improved, the network bandwidth can be effectively distributed, the network resources are more reasonably utilized, the signal receiver 11 is additionally arranged on the outer side of the outer protection box body 1, signals are conveniently and stably received and transmitted, and the signal transmission efficiency is improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims

1. An optimization system for handover between WiFi and cellular networks, characterized by: the method comprises the following steps:

2. The system of claim 1, wherein the system is configured to optimize handover between WiFi and cellular networks by: for S1, the method includes the following steps:

3. An optimization system for handover between WiFi and cellular networks according to claim 2, wherein: aiming at the QoS technology in S2, the method comprises the steps of flow classification, flow supervision, flow shaping, interface speed limitation, congestion management and congestion avoidance;

and (3) flow classification: the adoption of rules to identify the messages which accord with certain characteristics is the premise and the basis for carrying out differentiated service on network services;

flow supervision: the method comprises the steps of monitoring specific flow entering or flowing out of equipment, and taking a limiting or punishing measure when the flow exceeds a set value so as to protect network resources from being damaged and act in an interface entering direction and an interface exiting direction;

and (3) flow shaping: flow control measures for actively adjusting the output rate of the flow are used for enabling the flow to adapt to network resources which can be supplied by downstream equipment, so that unnecessary message discarding and delay are avoided, and the flow control measures act in the interface output direction;

and (3) congestion management: when congestion occurs, how to make a resource scheduling strategy to determine the processing sequence of message forwarding and act on the interface output direction;

congestion avoidance: the use condition of network resources is monitored, when the congestion is found to be in an aggravating trend, a strategy of actively discarding messages is adopted, the overload of the network is relieved by adjusting the length of the queue, and the overload acts on the interface outgoing side.

4. An optimization system for handover between WiFi and cellular networks according to claim 3, wherein: for the normal connection scenario in S3, after the AC receives the terminal connection request and determines that there is sufficient bandwidth allocated to the terminal according to the QoE evaluation result, the AC sends a connection response to the terminal through the AP within 50 milliseconds, starts an authentication process, and finally completes the connection, and stores connection data obtained from the AP in the AC.

5. An optimization system for handover between WiFi and cellular networks according to claim 4, wherein: for the weak signal scenario in S3, when the QoE evaluates that there is not enough bandwidth allocated to the end user under the current network conditions, the AC sends a response to the terminal device through the AP, and rejects the device to access the network, and the connection process is terminated, at this time, the terminal may select to access another network by itself.

6. An optimization system for handover between WiFi and cellular networks according to claim 5, wherein: for S4: when the terminal accesses the WiFi network, the AP monitors the RSSI of the terminal in real time and compares the RSSI with a threshold value, and when the RSSI is detected to be more than or equal to the threshold value, the network condition is good, and the AP keeps connection with the terminal; when the terminal moves to a WiFi signal weaker or no-signal area, the RSSI is reduced and is smaller than a threshold value, the AP actively interrupts the connection with the terminal, the terminal searches again and accesses other networks at the moment, and in addition, when the terminal which is normally connected with the network and the AP do not have data transmission for a long time, the AP actively sends a response request message to the terminal and decides to maintain or interrupt the connection with the equipment according to the response condition.

7. An optimization system for handover between WiFi and cellular networks according to claim 6, wherein: for S4: in actual operation, usually-75 dBm is selected as an RSSI threshold, which can be set by an AC and issued to an AP, and when a terminal device moves to an area with a poor network signal, the RSSI value gradually decreases to less than-75 dBm as the signal weakens, and at this time, the AP actively interrupts the network connection with the terminal and returns a connection termination report to the AC.

8. An optimization system for handover between WiFi and cellular networks according to claim 7, wherein: for S4: when data transmission does not exist between terminal equipment which is normally connected with a WiFi network and the AP for a long time, the AP can actively send a detection request to the terminal, when the WiFi network signal is poor, the mobile phone terminal can actively send a QoS NULL message to the AP to confirm the connection condition, and when the AP continuously detects that the RSSI of the terminal QoS NULL message is less than-75 dBm, the detection request can be sent to the mobile phone terminal.

9. An apparatus for optimized system utilization for handoff between WiFi and cellular networks as defined in claim 8, wherein: the device comprises an outer protection box body (1), wherein a signal receiver (11) is connected above the outer protection box body (1), a general processing unit (12), an access unit (13), an evaluation unit (14), a judgment unit (15) and an interruption control unit (16) are arranged in the outer protection box body (1), and the access unit (13), the evaluation unit (14), the judgment unit (15) and the interruption control unit (16) are all electrically connected with the general processing unit (12).

10. The apparatus of claim 9, wherein the apparatus further comprises means for optimizing the handover between WiFi and cellular networks: the access unit (13) accesses the terminal user through the signal receiver (11), and the evaluation unit (14) evaluates the accessed terminal user and feeds back the judgment result to the total processing unit (12) through the judgment unit (15).