CN106851728B - Load balancing method and device based on wired port and WDS wireless port - Google Patents

Abstract

Embodiments of the present invention belong to the field of communication technologies, and relate to a method and device for load balancing based on a wired port and a WDS wireless port. The method includes: acquiring the current SNR, current RSSI and current connection rate of the WDS wireless port; evaluating The current effective bandwidth of the WDS wireless port; compare the remaining bandwidth of the wired port and the WDS wireless port; wherein, the remaining bandwidth of the wired port is equal to the actual bandwidth minus the currently actually used bandwidth, and the WDS wireless port The remaining bandwidth is equal to the current effective bandwidth minus the currently actually used bandwidth; the wired port or the WDS wireless port with the larger remaining bandwidth is selected for data transmission. The method and device provided by the embodiments of the present invention can effectively and reasonably load balance the wired port of the wireless AP and the wireless port of the WDS.

Description

Load balancing method and device based on wired port and WDS wireless port

technical field

The present invention relates to the field of communication technologies, and in particular, to a method and device for load balancing based on wired ports and wireless ports in a wireless distribution system (WDS).

Background technique

In an existing wireless network topology, a wireless router (Wireless Access Point, AP) connected to a switch can extend network coverage through WDS wireless bridges. Generally speaking, WDS is established between two wireless APs, and one of the wireless APs acts as a wireless signal relay device to achieve the purpose of expanding the coverage of the wireless network. As shown in FIG. 1 , it is a schematic diagram of a network topology structure of a switch and a primary/secondary AP provided in the prior art. The primary AP10 and the secondary AP20 are connected to the switch 30 through Ethernet, a WDS bridge is established between the primary AP10 and the secondary AP20, and the wireless network coverage is extended through the secondary AP20.

In the process of implementing the present invention, the inventor found that the prior art has at least the following problems: after the WDS connection is established between the secondary AP 20 and the main AP 10, if the secondary AP 20 and the switch 30 transmit effective In this case, the secondary AP20 has two uplink ports, the wired port and the WDS wireless port, and these two uplink ports can perform load balancing. If we perform load balancing on these two uplink exports, there is such a problem. The bandwidth of the wired port is stable and the bit error rate is very low, while the bandwidth of the WDS wireless port changes dynamically and is often affected by the bit error rate. It is difficult to obtain WDS Effective bandwidth of the wireless port. Therefore, there is a problem in how to reasonably load balance the two upstream egresses.

SUMMARY OF THE INVENTION

To sum up, the embodiments of the present invention provide a method and device for load balancing based on a wired port and a WDS wireless port, so as to realize reasonable and effective load balancing between the wired port and the WDS wireless port of a wireless AP.

In a first aspect, an embodiment of the present invention provides a load balancing method based on a wired port and a WDS wireless port, which is applied to a wireless AP, including: acquiring the current SNR, current RSSI, and current connection rate of the WDS wireless port; evaluating the The current effective bandwidth of the WDS wireless port; compare the remaining bandwidth of the wired port and the WDS wireless port; wherein, the remaining bandwidth of the wired port is equal to the actual bandwidth minus the currently actually used bandwidth, and the remaining bandwidth of the WDS wireless port The bandwidth is equal to the current effective bandwidth minus the currently actually used bandwidth; and the wired port or the WDS wireless port with a larger remaining bandwidth is selected for data transmission.

Further, the evaluating the current effective bandwidth of the WDS wireless port includes: the current effective bandwidth of the WDS wireless port=current connection rate*Score, where the calculation method of Score is as follows: Score=(a*SNR′/SNRmax +b*RSSI′/RSSImax)*channel utilization rate, where SNR is the current signal-to-noise ratio of the WDS wireless port; SNRmax is the maximum signal-to-noise ratio of the WDS wireless port determined according to experience; SNR′=Min( SNR, SNRmax), namely take the minimum value between the current SNR and the SNRmax; RSSI is the current received signal strength indication of the WDS wireless port; RSSImax is the maximum value of the WDS wireless port determined according to experience Received signal strength indication; RSSI′=Min(RSSI, RSSImax), that is, take the minimum value between the current RSSI and the RSSImax; a and b are the weight values of SNR and RSSI set according to experience, a +b=1.0; the channel utilization is a percentage parameter, and the range is between [0, 1].

Further, the evaluating the current effective bandwidth of the WDS wireless port includes: the current effective bandwidth of the WDS wireless port=current connection rate*Score, where the calculation method of Score is as follows: Score=(a*SNR′/ SNRmax+b*RSSI′/RSSImax)*channel utilization rate*c, where SNR is the current signal-to-noise ratio of the WDS wireless port; SNRmax is the maximum signal-to-noise ratio of the WDS wireless port determined according to experience; SNR′ =Min(SNR, SNRmax), that is, take the minimum value between the current SNR and the SNRmax; RSSI is the current received signal strength indication of the WDS wireless port; RSSImax is the empirically determined WDS wireless interface The maximum received signal strength indication of the port; RSSI′=Min(RSSI, RSSImax), that is, take the minimum value between the current RSSI and the RSSImax; a and b are the weights of SNR and RSSI set according to experience, respectively value, a+b=1.0; the channel utilization is a percentage parameter, the range is between [0, 1]; c is the weight value set according to the number of terminals connected to the wireless AP, the range is between [0, 1] between.

In a second aspect, an embodiment of the present invention provides a load balancing device based on a wired port and a WDS wireless port, including: an acquisition unit configured to acquire the current SNR, current RSSI and current connection rate of the WDS wireless port; a WDS evaluation unit , used to evaluate the current effective bandwidth of the WDS wireless port; a comparison unit, used to compare the remaining bandwidth of the wired port and the WDS wireless port; wherein, the remaining bandwidth of the wired port is equal to the actual bandwidth minus the current actual bandwidth Used bandwidth, the remaining bandwidth of the WDS wireless port is equal to the current effective bandwidth minus the currently actually used bandwidth; transmission.

Further, the WDS evaluation unit is configured to evaluate the current effective bandwidth of the WDS wireless port, including: the current effective bandwidth of the WDS wireless port=current connection rate*Score, where the calculation method of Score is as follows: Score= (a*SNR'/SNRmax+b*RSSI'/RSSImax)*channel utilization rate, where SNR is the current signal-to-noise ratio of the WDS wireless port; SNRmax is the maximum signal-to-noise ratio of the WDS wireless port determined empirically ratio; SNR′=Min(SNR, SNRmax), that is, take the minimum value between the current SNR and the SNRmax; RSSI is the current received signal strength indication of the WDS wireless port; RSSImax is determined based on experience The maximum received signal strength indication of the WDS wireless port; RSSI′=Min(RSSI, RSSImax), that is, take the minimum value between the current RSSI and the RSSImax; a and b are the SNRs set according to experience, respectively and the weight value of RSSI, a+b=1.0; the channel utilization rate is a percentage parameter, and the range is between [0, 1].

Further, the WDS evaluation unit is configured to evaluate the current effective bandwidth of the WDS wireless port, including: the current effective bandwidth of the WDS wireless port=current connection rate*Score, where the calculation method of Score is as follows: Score= (a*SNR′/SNRmax+b*RSSI′/RSSImax)*channel utilization rate*c, where SNR is the current signal-to-noise ratio of the WDS wireless port; SNRmax is the maximum value of the WDS wireless port determined by experience Signal-to-noise ratio; SNR′=Min(SNR, SNRmax), that is, take the minimum value between the current SNR and the SNRmax; RSSI is the current received signal strength indication of the WDS wireless port; RSSImax is based on experience The determined maximum received signal strength indication of the WDS wireless port; RSSI′=Min(RSSI, RSSImax), that is, take the minimum value between the current RSSI and the RSSImax; a and b are respectively set according to experience The weight value of SNR and RSSI, a+b=1.0; the channel utilization is a percentage parameter, the range is between [0, 1]; c is the weight value set according to the number of terminals connected to the wireless AP, the range is in between [0, 1].

According to the load balancing method based on the wired port and the WDS wireless port provided by the embodiment of the present invention, the influence of the signal-to-noise ratio and the signal reception strength on the actual bandwidth of the WDS wireless port is fully considered, and the current effective bandwidth of the WDS wireless port is reasonably estimated. Then, by comparing the remaining bandwidth of the wired port and the remaining bandwidth of the WDS wireless port, select an outlet with a fast transmission rate to transmit data, so as to reasonably and effectively achieve load balancing between the wireless AP wired port and the WDS wireless port.

Description of drawings

In order to explain the present invention or the solutions in the prior art more clearly, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are of the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort. A method and device for load balancing based on wired port and wireless port

1 is a schematic diagram of the network topology of a switch and a primary/secondary wireless router (Wireless Access Point, AP) provided by the prior art;

2 is a schematic flowchart of a method for load balancing based on a wired port and a WDS wireless port provided by an embodiment of the present invention;

3 is a schematic diagram of a network topology of a switch, a primary/secondary wireless AP, and a wireless terminal (Station, STA) according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a device for load balancing based on a wired port and a WDS wireless port according to an embodiment of the present invention.

Detailed ways

In order for those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments, and preferred embodiments of the present invention are shown in the accompanying drawings. The present invention may be embodied in many different forms and is not limited to the embodiments described herein, but rather, these embodiments are provided so that a thorough understanding of the present disclosure will be provided. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. The terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

Example 1

A load balancing method based on a wired port and a WDS wireless port provided by an embodiment of the present invention is applied to a wireless router (Wireless Access Point, AP). Refer to the schematic diagram of the network topology of the switch 30 and the master AP10 and the slave AP20 shown in FIG. 1 . After the WDS connection is established between the secondary AP20 and the primary AP10, if the wired port connection between the secondary AP20 and the switch 30 through the Ethernet is effective, the secondary AP20 has two uplink ports, the wired port and the WDS wireless port. The two upstream egresses can perform load balancing. In view of the above situation, this embodiment provides a method for implementing load balancing between the wired port of the wireless AP and the wireless port of the WDS, as shown in FIG. 2 .

Step S1001: Acquire the current signal-to-noise ratio (Signal Noise Ratio, SNR), the current Receive Signal Strength Indicator (Receive Signal Strength Indicator, RSSI) and the current connection rate of the WDS wireless port.

In this embodiment, based on the network topology shown in FIG. 1 , the secondary AP 20 obtains the current SNR, the current RSSI and the current connection rate of its WDS wireless port.

Step S1002: Evaluate the current effective bandwidth of the WDS wireless port.

The current effective bandwidth of the WDS wireless port=current connection rate*Score, where the calculation method of Score is as follows:

Score=(a*SNR'/SNRmax+b*RSSI'/RSSImax)*channel utilization rate, where SNR is the current signal-to-noise ratio of the WDS wireless port; SNRmax is the maximum signal-to-noise ratio of the WDS wireless port determined according to experience; SNR'=Min(SNR, SNRmax), that is, the minimum value between the current SNR and SNRmax is taken. RSSI is the current received signal strength indication of the WDS wireless port; RSSImax is the maximum received signal strength indication of the WDS wireless port determined according to experience; RSSI′=Min(RSSI, RSSImax), that is, take the minimum value between the current RSSI and RSSImax value. In addition, a and b are weight values of SNR and RSSI set according to experience, respectively, and it needs to satisfy a+b=1.0. Channel utilization is a percentage parameter in the range [0, 1].

For the current SNR, current RSSI and current connection rate of the WDS wireless port of the wireless AP that needs to be used, the user can set a certain period to collect, and perform average processing within the period, and calculate the Score accordingly.

Step S1003: Compare the remaining bandwidth of the wired port and the WDS wireless port; wherein, the remaining bandwidth of the wired port is equal to the actual bandwidth minus the current actual used bandwidth, and the remaining bandwidth of the WDS wireless port is equal to the current effective bandwidth minus the current actual bandwidth. Bandwidth used.

The current actual used bandwidth of the wired port of the secondary AP20 can be obtained by measurement. The remaining bandwidth of the wired port is equal to the actual bandwidth minus the current actual used bandwidth. The current actual used bandwidth of the WDS wireless port can be obtained by measurement. The remaining bandwidth is equal to the current effective bandwidth of the WDS wireless port obtained according to the evaluation in step S1002 minus the currently actually used bandwidth.

Step S1004: Select a wired port or a WDS wireless port with a large remaining bandwidth for data transmission.

The secondary AP20 selects a wired port or a WDS wireless port with a large remaining bandwidth for uplink data transmission.

The above load balancing method based on the wired port and WDS wireless port is used, and the actual measurement and evaluation data are combined as follows: the actual bandwidth of the wired port of the secondary AP20 is 100M, and the currently used bandwidth is 50M; the bandwidth of the WDS wireless port will be affected by signal noise. The calculated value of Score is 0.6, and the actual bandwidth of the WDS wireless port is 150M. Then, the current effective bandwidth of the WDS wireless port is 150M*0.6=90M, and the currently used WDS wireless port is The bandwidth is 10M. At this time, the remaining bandwidth of the wired port is 100M-50M=50M, the remaining bandwidth of the WDS wireless port is 90M-10M=80M, the remaining bandwidth of the wired port is greater than the remaining bandwidth of the WDS wireless port, and the secondary AP20 selects the WDS wireless port for data transmission. .

According to the load balancing method based on the wired port and the WDS wireless port provided by the embodiment of the present invention, the influence of the signal-to-noise ratio and the signal reception strength on the actual bandwidth of the WDS wireless port is fully considered, and the current effective bandwidth of the WDS wireless port is reasonably estimated. Then, by comparing the remaining bandwidth of the wired port and the remaining bandwidth of the WDS wireless port, select an outlet with a fast transmission rate to transmit data, so as to reasonably and effectively achieve load balancing between the wireless AP wired port and the WDS wireless port.

Embodiment 2

Based on the first embodiment, as an optional solution of the embodiment of the present invention, when evaluating the current effective bandwidth of the WDS wireless port, the influence of the number of terminals (Station, STA) connected to the main AP 10 on wireless data transmission is further considered. As shown in FIG. 3 , it is a schematic diagram of a network topology of a switch, a primary/secondary wireless AP, and a wireless terminal (Station, STA) according to an embodiment of the present invention. Several STAs 40 are connected to the primary AP 10 . Because the WDS bridge established between the primary AP10 and the secondary AP20 may also share bandwidth with several STAs 40 connected to the primary AP10, the more STAs 40 connected, the easier it is to cause packet collisions and affect data transmission. Therefore, the coefficient c is further set according to the number of terminal connections of the master AP. For example, when the number of connections of the STA40 is 10, the coefficient c=0.8; when the number of connections of the STA is 20, the coefficient c=0.6.

In this embodiment, to evaluate the current effective bandwidth of the WDS wireless port, the following method is used:

The current effective bandwidth of the WDS wireless port=current connection rate*Score, where the calculation method of Score is as follows:

Score=(a*SNR′/SNRmax+b*RSSI′/RSSImax)*channel utilization rate*c, where SNR is the current signal-to-noise ratio of the WDS wireless port; SNRmax is the maximum signal-to-noise ratio of the WDS wireless port determined empirically ratio; SNR′=Min(SNR, SNRmax), that is, take the minimum value between the current SNR and SNRmax. RSSI is the current received signal strength indication of the WDS wireless port; RSSImax is the maximum received signal strength indication of the WDS wireless port determined according to experience; RSSI′=Min(RSSI, RSSImax), that is, take the minimum value between the current RSSI and RSSImax value. In addition, a and b are weight values of SNR and RSSI set according to experience, respectively, and it needs to satisfy a+b=1.0. Channel utilization is a percentage parameter in the range [0, 1]. In addition, the coefficient c is a weight value set according to the number of terminals connected to the main AP. The greater the number of terminals, the lower the weight value, and the range is between [0, 1].

The other steps are the same as those described in the first embodiment, and are not repeated here.

According to the load balancing method based on the wired port and the WDS wireless port provided by the embodiment of the present invention, according to the empirical value, the influence of the signal-to-noise ratio and the signal reception strength on the actual bandwidth of the WDS wireless port is fully considered, and the connection with the main AP is further considered. According to the influence of the number of STAs, the current effective bandwidth of the WDS wireless port can be reasonably estimated. Then, by comparing the remaining bandwidth of the wired port and the remaining bandwidth of the WDS wireless port, select the outlet with the fastest transmission rate to transmit data, so as to reasonably and effectively realize the wireless AP wired connection. Load balancing between ports and WDS wireless ports.

Embodiment 3

An embodiment of the present invention provides a load balancing device based on a wired port and a WDS wireless port, as shown in the structural block diagram in FIG. Each unit is described in detail, including:

The obtaining unit 202 is configured to obtain the current signal-to-noise ratio (Signal Noise Ratio, SNR), the current Receive Signal Strength Indicator (Receive Signal Strength Indicator, RSSI) and the current connection rate of the WDS wireless port.

The WDS evaluation unit 204 is configured to evaluate the current effective bandwidth of the WDS wireless port.

The current effective bandwidth of the WDS wireless port=current connection rate*Score, where the calculation method of Score is as follows:

Score=(a*SNR'/SNRmax+b*RSSI'/RSSImax)*channel utilization rate, where SNR is the current signal-to-noise ratio of the WDS wireless port; SNRmax is the maximum signal-to-noise ratio of the WDS wireless port determined according to experience; SNR'=Min(SNR, SNRmax), that is, the minimum value between the current SNR and SNRmax is taken. RSSI is the current received signal strength indication of the WDS wireless port; RSSImax is the maximum received signal strength indication of the WDS wireless port determined according to experience; RSSI′=Min(RSSI, RSSImax), that is, take the minimum value between the current RSSI and RSSImax value. In addition, a and b are weight values of SNR and RSSI set according to experience, respectively, and it needs to satisfy a+b=1.0. Channel utilization is a percentage parameter in the range [0, 1].

For the current SNR, current RSSI and current connection rate of the WDS wireless port of the wireless AP that needs to be used, the user can set a certain period to collect, and perform average processing within the period, and calculate the Score accordingly.

Preferably, when considering the bandwidth sharing of the WDS bridge by the number of STAs connected to the main AP, a coefficient c is further introduced, and the coefficient c is a weight value set according to the number of terminals connected to the main AP, the number of terminals. The more, the lower the weight value, in the range of [0, 1]. At this time, Score=(a*SNR'/SNRmax+b*RSSI'/RSSImax)*channel utilization rate*c.

The comparison unit 206 is used to compare the remaining bandwidth of the wired port and the WDS wireless port; wherein, the remaining bandwidth of the wired port is equal to the actual bandwidth minus the current actual used bandwidth, and the remaining bandwidth of the WDS wireless port is equal to the current effective bandwidth minus the bandwidth. Go to the actual currently used bandwidth.

The selection unit 208 is configured to select a wired port or a WDS wireless port with a large remaining bandwidth for data transmission.

According to the load balancing device based on the wired port and the WDS wireless port provided by the embodiment of the present invention, according to the empirical value, the influence of the signal-to-noise ratio and the signal reception strength on the actual bandwidth of the WDS wireless port is fully considered, and the current capacity of the WDS wireless port is reasonably evaluated. Then, by comparing the remaining bandwidth of the wired port and the remaining bandwidth of the WDS wireless port, select the outlet with high transmission quality to transmit data, so as to reasonably and effectively realize the load balance between the wired port of the wireless AP and the wireless port of the WDS.

In the above embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are only illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components may be combined. Either it can be integrated into another system, or some features can be omitted, or not implemented.

The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

The above are only the embodiments of the present invention, but do not limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still implement the foregoing specific implementations. Modifications are made to the technical solutions recorded in the method, or equivalent replacements are made to some of the technical features. Any equivalent structures made by using the contents of the description and the accompanying drawings of the present invention, which are directly or indirectly applied in other related technical fields, are all within the protection scope of the patent of the present invention.

Claims (2)

1. a load balancing method based on wired port and WDS wireless port, applied to wireless AP, is characterized in that, comprises: Obtain the current SNR, current RSSI and current connection rate of the WDS wireless port; Evaluating the current effective bandwidth of the WDS wireless port, the evaluating the current effective bandwidth of the WDS wireless port includes: the current effective bandwidth of the WDS wireless port=current connection rate*Score, where the calculation method of Score is as follows: Score =(a*SNR'/SNRmax+b*RSSI'/RSSImax)*channel utilization rate, where SNR is the current signal-to-noise ratio of the WDS wireless port; SNRmax is the maximum signal-to-noise ratio of the WDS wireless port determined empirically. Noise ratio; SNR′=Min(SNR, SNRmax), that is, take the minimum value between the current SNR and the SNRmax; RSSI is the current received signal strength indication of the WDS wireless port; RSSImax is determined based on experience The maximum received signal strength indication of the WDS wireless port; RSSI′=Min(RSSI, RSSImax), that is, take the minimum value between the current RSSI and the RSSImax; a and b are respectively set according to experience The weight value of SNR and RSSI, a+b=1.0; the channel utilization is a percentage parameter, and the range is between [0, 1]; or: The evaluating the current effective bandwidth of the WDS wireless port includes: the current effective bandwidth of the WDS wireless port=current connection rate*Score, where the calculation method of Score is as follows: Score=(a*SNR′/SNRmax+b* RSSI′/RSSImax)*channel utilization rate*c, where SNR is the current signal-to-noise ratio of the WDS wireless port; SNRmax is the maximum signal-to-noise ratio of the WDS wireless port determined according to experience; SNR′=Min(SNR , SNRmax), that is, take the minimum value between the current SNR and the SNRmax; RSSI is the current received signal strength indication of the WDS wireless port; RSSImax is the maximum received signal strength of the WDS wireless port determined according to experience Signal strength indication; RSSI′=Min(RSSI, RSSImax), that is, take the minimum value between the current RSSI and the RSSImax; a and b are the weight values of SNR and RSSI set according to experience, a+ b=1.0; the channel utilization rate is a percentage parameter, and the range is between [0, 1]; c is the weight value set according to the number of terminals connected to the wireless AP, and the range is between [0, 1]; Compare the remaining bandwidth of the wired port and the WDS wireless port; wherein, the remaining bandwidth of the wired port is equal to the actual bandwidth minus the currently actually used bandwidth, and the remaining bandwidth of the WDS wireless port is equal to the current effective bandwidth minus the bandwidth. to the actual currently used bandwidth; and Select the wired port or the WDS wireless port with a larger remaining bandwidth for data transmission. 2. A load balancing device based on wired port and WDS wireless port, is characterized in that, comprising: an acquisition unit, configured to acquire the current SNR, the current RSSI and the current connection rate of the WDS wireless port; The WDS evaluation unit is used to evaluate the current effective bandwidth of the WDS wireless port; A comparison unit, configured to compare the remaining bandwidth of the wired port and the WDS wireless port; wherein, the remaining bandwidth of the wired port is equal to the actual bandwidth minus the currently actually used bandwidth, and the remaining bandwidth of the WDS wireless port is equal to all the stated current effective bandwidth minus the current actual used bandwidth; and a selection unit, configured to select the wired port or the WDS wireless port with a large remaining bandwidth for data transmission; Wherein, the WDS evaluation unit is used to evaluate the current effective bandwidth of the WDS wireless port, including: the current effective bandwidth of the WDS wireless port=current connection rate*Score, where the calculation method of Score is as follows: Score=( a*SNR′/SNRmax+b*RSSI′/RSSImax)*channel utilization rate, where SNR is the current SNR of the WDS wireless port; SNRmax is the maximum SNR of the WDS wireless port determined empirically ; SNR′=Min(SNR, SNRmax), that is, take the minimum value between the current SNR and the SNRmax; RSSI is the current received signal strength indication of the WDS wireless port; RSSImax is the empirically determined The maximum received signal strength indication of the WDS wireless port; RSSI′=Min(RSSI, RSSImax), that is, take the minimum value between the current RSSI and the RSSImax; a and b are the SNR and The weight value of RSSI, a+b=1.0; the channel utilization rate is a percentage parameter, and the range is between [0, 1]; or; The WDS evaluation unit is used to evaluate the current effective bandwidth of the WDS wireless port, including: the current effective bandwidth of the WDS wireless port=current connection rate*Score, where the calculation method of Score is as follows: Score=(a* SNR′/SNRmax+b*RSSI′/RSSImax)*channel utilization rate*c, where SNR is the current signal-to-noise ratio of the WDS wireless port; SNRmax is the maximum signal-to-noise ratio of the WDS wireless port determined according to experience ; SNR′=Min(SNR, SNRmax), that is, take the minimum value between the current SNR and the SNRmax; RSSI is the current received signal strength indication of the WDS wireless port; RSSImax is the empirically determined The maximum received signal strength indication of the WDS wireless port; RSSI′=Min(RSSI, RSSImax), that is, take the minimum value between the current RSSI and the RSSImax; a and b are the SNR and The weight value of RSSI, a+b=1.0; the channel utilization rate is a percentage parameter, the range is between [0, 1]; c is the weight value set according to the number of terminals connected to the wireless AP, the range is [0, 1] between.

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