WO2021082878A1

WO2021082878A1 - Wlan system, communication method and device

Info

Publication number: WO2021082878A1
Application number: PCT/CN2020/119845
Authority: WO
Inventors: 王云贵; 付洁
Original assignee: 华为技术有限公司
Priority date: 2019-10-31
Filing date: 2020-10-07
Publication date: 2021-05-06
Also published as: CN112752345B; CN112752345A

Abstract

Disclosed are a WLAN system, and a communication method and device. The WLAN system comprises a controller, and a first access point and a second access point which have a working channel of the same frequency; the controller instructs the first access point and the second access point to communicate with the WLAN terminal within different scheduling periods, respectively; the second access point is used for acquiring an initial data communication rate, a first signal strength and a second signal strength corresponding to the WLAN terminal, and adjusting the initial data communication rate to a target data communication rate according to the first signal strength and the second signal strength, and starting data communication with the WLAN terminal on the basis of the target data communication rate in a second scheduling period. The data communication rate between the WLAN terminal and the access point is controlled through the signal strength, which can effectively reduce the degradation of service performance after the WLAN terminal switches the access point.

Description

WLAN system, communication method and device

This application claims the priority of a Chinese patent application filed on October 31, 2019 with the application number 201911056214.X and the invention title "A WLAN system, communication method and device", the entire content of which is incorporated into this application by reference in.

Technical field

This application relates to the field of communication technology, and in particular to a WLAN system, communication method and device.

Background technique

Wireless local area network (WLAN) refers to the application of wireless communication technology to interconnect computer equipment to form a network system that can communicate with each other and realize resource sharing. It exists in personal homes, corporate park offices, education and medical institutions, etc. More applications and deployments. Among them, the WLAN may include an access point (access point, AP) and a station (station, STA). The AP can provide wireless access services for the STA. The efficiency of communication between AP and STA is affected by the data communication rate.

Summary of the invention

This application provides a WLAN system, communication method, and device to realize the determination of the data communication rate between the STA and the access point.

On the one hand, the present application provides a WLAN system. The WLAN system may include a controller, a first access point, and a second access point. The frequencies of the working channels of the first access point and the second access point are Same; the controller can be used to indicate that the first access point can communicate with the WLAN terminal during the first scheduling period but cannot transmit wireless signals during the second scheduling period, and instruct the second access point The wireless signal cannot be sent in the first scheduling period, but the WLAN terminal can communicate with the WLAN terminal in the second scheduling period, where the second scheduling period is after the first scheduling period; the second access point can be used to obtain The initial data communication rate, the first signal strength, and the second signal strength corresponding to the WLAN terminal, and the initial data communication rate is adjusted to the target data communication rate according to the first signal strength and the second signal strength, and in the second scheduling period The internal data communication with the WLAN terminal starts based on the target data communication rate, where the first access point can perform data communication with the WLAN terminal within the first scheduling period based on the initial data communication rate, and the first signal strength is the first access point. The signal strength of the wireless signal between the access point and the WLAN terminal, and the second signal strength is the signal strength of the wireless signal between the second access point and the WLAN terminal.

Since the signal strength between the WLAN terminal and the access point can reflect the signal quality during the communication between the WLAN terminal and the access point, in the WLAN system, the second access point performs data communication with the WLAN terminal. According to the signal strength between the WLAN terminal and the first access point and the second access point, the initial data communication rate can be adjusted accordingly. In this way, after the second access point communicates with the WLAN terminal based on the adjusted data communication rate, the data communication rate between the second access point and the WLAN terminal and the signal quality between the second access point and the WLAN terminal can be Accordingly, by controlling the data communication rate of the WLAN terminal, it is possible to effectively reduce the degradation of service performance after the WLAN terminal switches the access point.

In a possible implementation, when the first signal strength is greater than the second signal strength, the initial data communication rate is less than the target data communication rate, and when the first signal strength is less than the second signal strength, the initial data communication rate The data communication speed is greater than the target data communication speed.

When adjusting the initial data communication rate to obtain the target data communication rate, the second access point may be based on the magnitude of the first signal strength and the magnitude of the second signal strength corresponding to the WLAN terminal, and specifically may be based on the first signal strength and the second signal strength. The difference or ratio of the signal strengths will increase or decrease the initial data communication rate accordingly. Taking the difference as an example, the second access point can calculate the difference between the first signal strength and the second signal strength, and when the difference is positive, that is, the first signal strength is greater than the second signal strength, then The initial data communication rate can be reduced so that the target data communication rate obtained is less than the initial data communication rate, and when the difference is negative, that is, the first signal strength is less than the second signal strength, the initial data communication rate can be increased, so that The target data communication rate is greater than the initial data communication rate. The second access point increases or decreases the initial data communication rate according to the first signal strength and the second signal strength, so that the data communication rate between the second access point and the WLAN terminal can be more in line with the second access point and the WLAN terminal The rate actually required for the signal quality between the two, especially when the first signal strength is less than the second signal strength, by increasing the data communication rate between the second access point and the WLAN terminal, the service performance of the WLAN terminal can be improved Be further improved.

In a possible implementation manner, the initial data communication rate is the actual data communication rate when the first access point performs data communication with the WLAN terminal for the last time in the first scheduling period, or based on the actual data communication rate and the message The data communication rate determined by the error rate.

In this embodiment, the second access point may refer to the actual data communication rate of the first access point during the last data communication with the WLAN terminal within the first scheduling period, and determine the second access point based on the actual data communication rate. The data communication rate between the entry point and the WLAN terminal. Alternatively, the data communication rate referred to by the second access point may be a data communication rate obtained by adjusting the actual data communication rate. The second access point may use the message error rate corresponding to the WLAN terminal to adjust the data communication rate. It can be understood that when the message error rate is high, it indicates that the data communication quality between the access point and the WLAN terminal is low, and the data communication rate between the access point and the WLAN terminal can be appropriately reduced to increase the data frame or The success rate of message transmission; and when the message error rate is low, it indicates that the data communication quality between the access point and the WLAN terminal is high, and the data communication rate between the access point and the WLAN terminal can be appropriately increased. Wherein, the actual data communication rate may be adjusted according to the message error rate of the terminal based on the preset correspondence relationship.

In a further possible implementation manner, the message error rate may be calculated according to the historical message error rate corresponding to the WLAN terminal and the current message error rate, where the current message error rate is the first access point in the first access point. The message error rate during data communication with the WLAN terminal in a scheduling period.

When determining the message error rate of the WLAN terminal, if the historical message error rate is directly used as the message error rate of the WLAN terminal, the current message error rate of the first access point and the WLAN terminal is not considered, that is, The data communication situation between the first access point and the WLAN terminal in the first scheduling period is not considered; similarly, if the current message error rate is used as the message error rate of the WLAN terminal, it may be due to the first scheduling period The accidental communication quality change between the internal first access point and the WLAN terminal causes the final determined data communication rate to be unsatisfactory. Therefore, the second access point can determine the message error rate of the WLAN terminal in combination with the historical message error rate and the current message error rate. For example, a weighted summation method can be used, that is, the historical message error rate and the current message error rate are assigned corresponding weights, and the sum of the weights is 1, and then the historical message error rate and the current message error rate are calculated. The product of the error rate and the respective weights, so that the sum of the two products obtained is determined as the message error rate corresponding to the WLAN terminal. In this way, when determining the message error rate of the WLAN terminal, the current communication situation of the data communication between the first access point and the WLAN terminal is considered, and the initial data communication rate determined when the current communication situation is occasionally abnormal can be reduced. Impact.

In a possible implementation manner, the signal strength of the wireless signal between the access point and the WLAN terminal may specifically refer to the reference signal reception detected by the access point or the WLAN terminal when receiving the wireless signal sent by the opposite terminal. Power (RSRP), received signal strength (RSSI), signal-to-noise ratio (SNR), signal-to-interference and noise ratio (SINR), or any combination thereof. That is, the first signal strength may be the RSRP, RSSI, SNR, SINR, or any combination thereof detected by the first access point or WLAN terminal when the first access point performs data communication with the WLAN terminal. Similarly, the second The signal strength may specifically be RSRP, RSSI, SNR, SINR, or any combination thereof detected by the second access point or the WLAN terminal when the second access point performs data communication with the WLAN terminal.

On the other hand, the present application also provides a communication method, the method includes: the first access point obtains the initial data communication rate, the first signal strength, and the second signal strength corresponding to the wireless local area network WLAN terminal, wherein the first The signal strength is the signal strength of the wireless signal between the first access point and the WLAN terminal, and the second signal strength is the signal strength of the wireless signal between the second access point and the WLAN terminal. The frequency of the working channel of the access point is the same, and the first access point can communicate with the WLAN terminal during the first scheduling time but cannot transmit wireless signals during the second scheduling time period, and the second access point The point cannot transmit wireless signals during the first scheduling period, but can communicate with the WLAN terminal during the second scheduling period, the first scheduling period is after the second scheduling period; the first access point is based on the first signal strength And the second signal strength adjusts the initial data communication rate to the target data communication rate; the first access point starts data communication with the WLAN terminal based on the target data communication rate in the first scheduling period.

During the first scheduling period, the first access point does not directly use the data communication rate of the second access point during data communication with the WLAN terminal during the second scheduling period as the first access point and the WLAN terminal The data communication rate used when starting data communication with the WLAN terminal. Instead, the signal strength between the WLAN terminal and the first access point and the second access point is used to correspond to the received data communication rate. The adjustment makes the data communication rate used when the first access point and the WLAN terminal start data communication more in line with the data communication rate required by the signal quality between the first access point and the WLAN terminal.

In this implementation manner, it may be determined whether to increase or decrease the initial data communication rate according to the magnitude between the first signal strength and the second signal strength. For example, it may be determined whether to increase the initial data communication rate or decrease the initial data communication rate according to whether the difference between the first signal strength and the second signal strength is positive or negative or the ratio is greater than one. Especially when the first signal strength is greater than the second signal strength, by increasing the data communication rate between the second access point and the WLAN terminal, the service performance of the WLAN terminal can be further improved.

In a possible post-implementation, the target data communication rate is not greater than the first preset rate, and the target data communication rate is not less than the second preset rate, wherein the first preset rate is greater than the second preset rate. Set rate.

In this embodiment, in the process of adjusting the initial data communication rate to obtain the target data communication rate, the target data communication rate obtained has certain upper and lower limits, that is, the target data communication rate cannot be too high, but not too small. . Therefore, in the process of increasing the initial data communication rate, the obtained target data communication rate is not greater than the first preset rate, and in the process of reducing the initial data communication rate, the obtained target data communication rate is not less than the second preset rate. Assuming the rate, of course, the first preset rate is greater than the second preset rate.

In a possible implementation manner, the first access point sends a reference data communication rate to the third access point, where the reference data communication rate is the last time the first access point communicates with the WLAN terminal in the first scheduling period. The actual data communication rate during data communication, or the data communication rate determined based on the actual data communication rate and the message error rate; wherein the frequencies of the working channels of the third access point and the first access point are the same, The third access point cannot transmit wireless signals in the first scheduling period and the second scheduling period, and can perform data communication with the WLAN terminal in the third scheduling period, which is after the first scheduling period.

In this embodiment, the third access point is the next access point with a scheduling period (that is, the aforementioned third scheduling period), and when the second scheduling period ends, the first access point can communicate with the third access point. The access point sends the reference data communication rate so that the third access point can start data communication with the WLAN terminal within the third scheduling period based on the reference data communication rate, so that the third access point can communicate with the WLAN terminal. Effective control of the data communication rate between.

In a possible implementation manner, the first access point calculates the message error rate according to the historical message error rate corresponding to the WLAN terminal and the current message error rate, where the current message error rate is the first The message error rate when an access point performs data communication with the WLAN terminal in the first scheduling period.

In this embodiment, when the initial data communication rate sent by the first access point to the third access point is the data communication rate obtained by adjusting the actual data communication rate based on the message error rate corresponding to the WLAN terminal At this time, the message error rate corresponding to the WLAN terminal may be obtained by comprehensive calculation of the historical message error rate and the current message error rate by the first access point. For example, it may be a weighted summation of the historical message error rate and the current message error rate, so that the result of the weighted summation may be used as the message error rate corresponding to the WLAN terminal.

In a possible implementation manner, the target data communication rate may be an uplink data communication rate between the second access point and the WLAN terminal or a downlink data communication rate. In this embodiment, when the second access point controls the data communication rate between it and the WLAN terminal, it may specifically control the rate at which downlink data is sent to the WLAN terminal, or the rate at which the WLAN terminal receives uplink data. .

In another aspect, the present application also provides a communication method, including: the controller obtains the initial data communication rate and signal strength corresponding to the wireless local area network WLAN terminal, where the signal strength is the signal strength of the wireless signal between the second access point and the WLAN terminal , The frequency of the working channel of the first access point and the second access point is the same, and the first access point can communicate with the WLAN terminal during the first scheduling time but cannot during the second scheduling time period Transmit wireless signals, but the second access point cannot transmit wireless signals during the first scheduling period but can communicate with the WLAN terminal during the second scheduling period, the first scheduling period is after the second scheduling period; this control The device sends the initial data communication rate and the signal strength to the first access point.

In another aspect, the present application also provides a communication device, which can be applied to the first access point, and the device may specifically include: an acquisition module for acquiring the initial data communication rate corresponding to the wireless local area network WLAN terminal, the first The signal strength and the second signal strength, the first signal strength is the signal strength of the wireless signal between the first access point and the WLAN terminal, the second signal strength is the signal strength of the wireless signal between the second access point and the WLAN terminal, the first The frequency of the working channel of the access point and the second access point is the same. The first access point can communicate with the WLAN terminal during the first scheduling time but cannot transmit wireless signals during the second scheduling time period. The in-point cannot transmit wireless signals during the first scheduling period but can communicate with the WLAN terminal during the second scheduling period. The first scheduling period is after the second scheduling period; the adjustment module is used to adjust the signal strength according to the first signal strength and The second signal strength adjusts the initial data communication rate to the target data communication rate; the communication module is configured to start data communication with the WLAN terminal based on the target data communication rate in the first scheduling period.

In a possible implementation manner, when the first signal strength is greater than the second signal strength, the initial data communication rate is greater than the target data communication rate, and when the first signal strength is less than the second signal strength, the initial data communication rate is less than Target data communication rate.

In a possible implementation manner, the apparatus further includes: a sending module, configured to send a reference data communication rate to the third access point, where the reference data communication rate is the last communication rate between the first access point and the WLAN terminal within the first scheduling period. The actual data communication rate during one data communication, or the data communication rate determined based on the actual data communication rate and the message error rate; where the frequency of the working channel of the third access point is the same as that of the first access point , The third access point cannot send wireless signals during the first scheduling period and the second scheduling period, and can communicate with the WLAN terminal during the third scheduling period, and the third scheduling period is connected to the first scheduling period.

In a possible implementation manner, the device further includes: a calculation module for calculating the message error rate according to the historical message error rate corresponding to the WLAN terminal and the current message error rate, and the current message error rate is the first received error rate. The message error rate when the in-point performs data communication with the WLAN terminal in the first scheduling period.

In still another aspect, the present application also provides a communication device, which can be applied to a controller, and the device can include: an acquisition module for acquiring the initial data communication rate and signal strength corresponding to the wireless local area network WLAN terminal, where the signal strength is The signal strength of the wireless signal between the second access point and the WLAN terminal, the frequency of the working channel of the first access point and the second access point are the same, and the first access point can communicate with the WLAN terminal within the first scheduling time However, the wireless signal cannot be transmitted during the second scheduling period, and the second access point cannot transmit wireless signals during the first scheduling period but can communicate with the WLAN terminal during the second scheduling period. The first scheduling period is in the first scheduling period. 2. After the scheduling period; the sending module is used to send the initial data communication rate and signal strength to the first access point.

In another aspect, the present application also provides a computer-readable storage medium that stores instructions in the computer-readable storage medium, and when the computer-readable storage medium runs on a computer, the computer executes the communication provided in the above-mentioned aspect. method.

In another aspect, a computer program product containing instructions is provided, which when the computer program product runs on a computer, causes the computer to execute the communication method provided in the above-mentioned aspect.

The technical effects obtained by the communication methods, communication devices, computer-readable storage media, and computer program products provided in the above aspects are similar to those obtained by the corresponding technical means in the WLAN system provided in the above aspects, and will not be repeated here. Go into details.

It can be seen from the above technical solutions that this application has the following advantages:

The WLAN system may at least include a controller, a first access point, and a second access point. The frequencies of the working channels of the first access point and the second access point are the same, such as the first access point and the second access point. All points use 80MHz or 160MHZ high-bandwidth frequency bands. The controller in the WLAN system can be used to instruct the first access point to be able to communicate with the WLAN terminal during the first scheduling period but not to transmit wireless signals during the second scheduling period, and to instruct the second access point The wireless signal cannot be transmitted in the first scheduling period, but data communication can be performed with the WLAN terminal in the second scheduling period, where the second scheduling period is after the first scheduling period. The second access point in the WLAN system may be used to obtain the initial data communication rate corresponding to the WLAN terminal, and the first access point performs data communication with the WLAN terminal in the first scheduling period based on the initial data communication rate. At the same time, the second access point also obtains the first signal strength between the WLAN terminal and the first access point and the second signal strength between the WLAN terminal and the second access point, and according to the first signal strength The initial data communication rate is adjusted with the second signal strength, and the initial data communication rate is specifically adjusted to the target data communication rate. Then, the second access point may start to communicate with the target data communication rate during the second scheduling period. The WLAN terminal performs data communication. In the WLAN system, since the signal strength between the WLAN terminal and the access point can reflect the signal quality during the communication between the WLAN terminal and the access point, the second access point performs data communication with the WLAN terminal. According to the signal strength between the WLAN terminal and the first access point and the second access point, the initial data communication rate can be adjusted accordingly, so that the second access point communicates with the WLAN terminal based on the adjusted data communication rate. After communication, the data communication rate between the second access point and the WLAN terminal is adapted to the signal quality between the second access point and the WLAN terminal, and by controlling the data communication rate of the WLAN terminal, the WLAN terminal switching connection can be effectively reduced. After entering the point, business performance is degraded.

Description of the drawings

Figure 1 is a schematic diagram of channel division in the 5GHz frequency band;

Figure 2 is a network architecture diagram of an exemplary wireless access network;

Figure 3 is a network architecture diagram of a WLAN system in an embodiment of the application;

FIG. 4 is a schematic flowchart of a communication method in an embodiment of this application;

FIG. 5 is a schematic structural diagram of a communication device in an embodiment of the application;

Figure 6 is a schematic structural diagram of another communication device in an embodiment of the application

FIG. 7 is a schematic diagram of the hardware structure of a wireless communication device in an embodiment of the application.

Detailed ways

At present, WLAN networks usually use public shared spectrum, which mainly includes 2.4 gigahertz (GHz) frequency band and 5GHz frequency band. Since there are more available channels in the 5GHz frequency band and less interference, more and more WLAN networks (such as corporate offices, education and medical structures, etc.) use channels in the 5GHz frequency band to support communication between devices. As shown in Figure 1, the frequency range of the 5GHz band is generally from 5170 MHz to 5835MHz, and may include channels with a bandwidth of 20MHz and non-overlapping, or may include channels with a bandwidth of 40MHz and non-overlapping, or may include 80 MHz non-overlapping channels, or may include channels with a bandwidth of 160 MHz. At present, many APs and STAs support channels with bandwidths of 80 MHz and 160 MHz.

Among them, in order to cover a larger area, WLAN can form a wireless access network (ie, networking) with multiple APs, and each AP can time-division multiplex the same channel to avoid co-frequency interference between APs. Especially when the wireless access network uses 80MHz channels or 160MHz channels, due to the small number of open channels in China, the time-division multiplexing of high-bandwidth channels by each AP in the wireless access network can not only effectively avoid each channel. The problem of co-frequency interference between APs, and each AP can also provide high-speed data interaction services for terminals in the wireless access network.

As an example, the wireless access network can adopt the network architecture shown in Figure 2, consisting of a distributed transmit and receive controller (DTRC) and multiple APs (three APs in Figure 2 are used as Example) To form a DTR cell together. In the DTR cell, the AP can be responsible for accessing the STA, and send data to or receive data from the STA according to the parameters of the DTRC scheduling request (such as transmission time, bandwidth allocation, etc.); DTRC can be responsible for the users in the DTR cell (ie STA) mobility management, transmission control and data processing (in other scenarios, it can also be responsible for other DTR cell related work). DTRC can specifically schedule transceiver access points (TxAP), schedule users in DTR cells, and manage DTR inter-cell interference. Among them, the scheduling function of TxAP means that DTRC dynamically selects an AP in the DTR cell according to changes in user traffic and interference in the main lobe coverage area of each AP antenna pattern in the DTR cell according to a certain scheduling period. TxAP, the TxAP can perform uplink communication or downlink communication with STAs in the DTR cell within its allocated time slice, while other APs in the DTR cell can receive signals but cannot send signals in this time slice; in the DTR cell The user scheduling function refers to that the DTRC schedules the uplink and downlink transmission time of users in the entire DTR cell, and allocates appropriate resource units (RU), rate, and transmission power to them. In a high-bandwidth 80MHz or 160MHz network, TxAP can have enough larger bandwidth RUs (such as 242, 484, 996 subcarrier RUs) and narrower RUs (such as 26, 56 subcarrier RUs). Under this architecture, TxAP usually uses a larger bandwidth RU for users of the TxAP, while a narrower bandwidth RU can be used for users accessed by other APs in the DTR cell. This not only provides large bandwidth, but also ensures small Low-latency traffic flow services.

When the allocated time slice of the TxAP is exhausted, the TxAP in the DTR cell will transfer to another AP according to the DTRC scheduling, and perform uplink or downlink communication with the STA in the DTR cell in the time slice corresponding to the AP. At this time, the AP accessed by the STA usually needs to be handed over from the current AP to another AP (that is, an AP re-determined as a TxAP, such as a neighboring AP, etc., and the user is not aware of the handover process). However, after the STA switches the AP that it accesses, the service performance of the STA may be reduced.

The inventor found through research that the distance between the STA and different APs, the environment and other factors are usually different, which makes the signal quality between the STA and the AP may be due to the distance when the STA switches from the currently connected AP to another AP. , Environment and other factors, such as signal quality degradation. At this time, the AP after the handover still performs data communication with the STA at the data communication rate used by the previous TxAP to communicate with the STA. The communication data may be lost due to the deterioration of the signal quality between the TxAP and the STA. Circumstances, thereby reducing the service performance of the STA. For example, assuming that the communication rate between the STA and the previous AP is 100 megabits per second (Mbps), when the signal quality between the STA and the current AP deteriorates, if the current AP still communicates with the STA at the data communication rate of 100 Mbps For data communication, the signal decoding rate may be reduced due to poor signal quality, which may result in the loss of part or all of the data transmitted between the STA and the AP, and thus the service performance of the STA may be reduced due to the lost data.

Based on this, the embodiments of the present application provide a WLAN system in which the first access point (which may be the AP that the above-mentioned STA switches to access) can adjust the data when communicating with the WLAN terminal (ie, the above-mentioned STA). Communication rate. Specifically, the WLAN system may at least include a controller, a first access point, and a second access point. The frequencies of the working channels of the first access point and the second access point are the same, such as the first access point and the second access point. The second access points all use 80MHz or 160MHz high-bandwidth frequency bands. The controller in the WLAN system can be used to instruct the first access point to be able to communicate with the WLAN terminal during the first scheduling period but not to transmit wireless signals during the second scheduling period, and to instruct the second access point The wireless signal cannot be transmitted in the first scheduling period, but data communication can be performed with the WLAN terminal in the second scheduling period, where the second scheduling period is after the first scheduling period. The second access point in the WLAN system may be used to obtain the initial data communication rate corresponding to the WLAN terminal, and the first access point performs data communication with the WLAN terminal in the first scheduling period based on the initial data communication rate. At this time, if the second access point communicates with the WLAN terminal at the initial data communication rate, the problem of low service performance of the WLAN terminal may occur. For this reason, the second access point also obtains the connection between the WLAN terminal and the first The first signal strength between the access points (such as RSRP, RSSI, SNR or SINR) and the second signal strength between the WLAN terminal and the second access point, and according to the first signal strength and the second signal strength The initial data communication rate is adjusted, specifically the initial data communication rate is adjusted to the target data communication rate, and then the second access point can start data communication with the WLAN terminal based on the target data communication rate in the second scheduling period .

In the above-mentioned WLAN system, since the signal strength between the WLAN terminal and the access point can reflect the signal quality of the communication between the WLAN terminal and the access point, therefore, the second access point performs data communication with the WLAN terminal. According to the signal strength between the WLAN terminal and the first access point and the second access point, the initial data communication rate can be adjusted accordingly, so that the second access point communicates with the WLAN terminal based on the adjusted data communication rate. After communication, the data communication rate between the second access point and the WLAN terminal is adapted to the signal quality between the second access point and the WLAN terminal, and by controlling the data communication rate of the WLAN terminal, the WLAN terminal switching connection can be effectively reduced. After entering the point, business performance is degraded.

In this WLAN, the access point may be referred to as AP, and the terminal may be referred to as STA. Wherein, AP can be a network device such as a router or switch supporting WLAN, and STA can be a terminal device such as a mobile phone or computer supporting WLAN.

In the following, various non-limiting specific implementation manners in the embodiments of the present application will be described in detail through embodiments with reference to the accompanying drawings.

Refer to Fig. 3, which shows a schematic structural diagram of a WLAN system in an embodiment of the present application. As shown in FIG. 3, the communication system 300 may include two access points (controller 01, access point 021 (i.e., the aforementioned first access point), and access point 022 (i.e., the aforementioned second access point) ( FIG. 3 only includes two access points as an example for schematic illustration. In other embodiments, the WLAN system may include more than two access points). Wherein, the frequency of the operating channel of the access point 021 and the access point 022 is the same, which can be understood as the operating channel of the access point 021 and the access point 022 using the same frequency, or it can be understood as the operating channel of the access point 021 and the access point 022. There is overlap between the frequencies of the working channels used by the access point 021 and the access point 022. A communication connection may be established between the controller 01 and the access point 021 and the access point 022, for example, the communication connection may be established in a wired manner. The working channel of the wireless access node may also be referred to as a channel, which is not limited in the embodiment of the present application.

The controller 01 may be used to instruct the access point 021 to be the transceiving access point in the first scheduling period, and to instruct the access point 022 to be the transceiving access point in the second scheduling period. That is, in the first scheduling period, the access point 021 can communicate with the WLAN terminal but the access point 022 cannot send wireless signals, and in the second scheduling period, the access point 021 cannot send signals but access The entry point 022 can perform data communication with the WLAN terminal.

In this embodiment, the controller 01 can pre-allocate scheduling time periods for the access point 021 and the access point 022, and can notify the access point 021 and the access point 022 of the allocated scheduling time period. For example, the controller 01 can notify the access point 021 and the access point 022. A scheduling period is allocated to the access point 021, and a second scheduling period is allocated to the access point 022, and the second scheduling period is after the first scheduling period. Among them, the scheduling periods allocated by the controller 01 for different access points may not overlap each other, that is, the second scheduling period may be connected to the first scheduling period, or may exist between the first scheduling period and the second scheduling period. Partially overlapped. In short, the start time of the second scheduling period is after the start time of the first scheduling period. If there is a partial overlap between the first scheduling period and the second scheduling period, during the overlap period, each access point will compete for the channel in accordance with WLAN regulations (such as using carrier sense multiple access/collision avoidance (CSMA/CA)) . In this way, the access point 021 and the access point 022 can communicate with the WLAN terminal in their respective scheduling periods. In practical applications, the controller 01 can allocate multiple scheduling periods to the access point 021 and the access point 022. For example, the controller 01 can continue to allocate the access point 021 after allocating the second scheduling period to the access point 022 The third scheduling period, etc., of course, if the WLAN system further includes other access points, the controller 01 may also allocate the third scheduling period, etc. to other access points, and the third scheduling period is connected to the second scheduling period.

In a possible implementation manner, the controller 01 may allocate a scheduling period to the access point 021 and the access point 022 according to the service load of each access point and the priority of the service load, where the service load includes uplink data The traffic load and/or the traffic load of the downlink data. In specific implementation, if the priority of the service load of the access point is higher, the scheduling period allocated by the controller 01 for the access point is closer to the current time, that is, the access point is given priority to the WLAN to which it accesses. The terminal provides data communication services; on the contrary, if the priority of the service load of the access point is low, the scheduling period allocated by the controller 01 to the access point may be relatively far away from the current time. As for the duration of the allocated scheduling period, the controller 01 may determine according to the size of the service load of the access point. Specifically, if the service load of the access point is relatively large, the scheduling period that the controller 01 can allocate to the access point can be longer, such as 30 milliseconds (ms); otherwise, if the service of the access point is The load is relatively small, and the duration of the scheduling period that the controller 01 can allocate to the access point can be small, such as 10 ms.

Then, the controller 01 may send the allocated scheduling time periods to the access point 021 and the access point 022, so that the access point 021 and the access point 022 communicate with the WLAN terminals that are connected to the respective access points within their corresponding scheduling time periods. data communication. It should be noted that in this embodiment, the data communication between the access point and the WLAN terminal may specifically include uplink communication and downlink communication between the access point and the WLAN terminal, that is, the access point may send wireless signals to the WLAN terminal. It can also receive wireless signals sent by WLAN terminals.

At the same time, when the access point needs to send downlink buffer data to the WLAN terminal, the controller 01 may forward the downlink buffer data corresponding to each access point to the corresponding access point. In this way, the access point 021 or the access point 022 can deliver the downlink buffer data to the WLAN terminal within the corresponding scheduling period, and control the downlink data communication rate with the WLAN terminal during the scheduling period. Similarly, when the WLAN terminal needs to send uplink buffer data to the access point, the WLAN terminal can actively report the buffer size of the message to be sent, or the WLAN terminal can respond to the periodic transmission of the network side for the message buffer The size request informs the access point of the buffer size of the message to be sent. In this way, the access point 021 or the access point 022 can receive the buffered data sent by the WLAN terminal during the corresponding scheduling period, and control the uplink data communication rate of the WLAN terminal during the scheduling period.

When the scheduling period allocated by the access point 021 ends, the WLAN terminal under the access point 021 can switch to access the access point 022. At this time, the access point 022 may be used to obtain the initial data communication rate corresponding to the WLAN terminal. Wherein, in a possible implementation manner, the initial data communication rate may be that the access point 021 sends the initial data communication rate to the access point 022 at the end of the assigned scheduling period, or it may be The controller 01 sends the initial data communication rate to the access point 022 so that the access point 022 can obtain the initial data communication rate. It is worth noting that the initial data communication rate acquired by the access point 022 may be the actual data communication rate when the access point 021 performs data communication with the WLAN terminal for the last time in the first scheduling period, or it may be The data communication rate determined by adjusting the actual data communication rate, in an example, may specifically be a preliminary adjustment of the actual data communication rate according to the historical packet error rate (PER) corresponding to the WLAN terminal , Get the initial data communication rate corresponding to the WLAN terminal.

It is worth noting that the initial data communication rate corresponding to the WLAN terminal obtained by the access point 022 may not match the signal quality between the access point 022 and the WLAN terminal, which may result in poor service performance of the WLAN terminal. Low situation. Based on this, the access point 022 can also adjust the initial data communication rate according to the signal strength between the WLAN terminal and the access point 021 and the access point 022, respectively.

Specifically, the access point 022 may first obtain the first signal strength between the WLAN terminal and the access point 021 and the second signal strength between the terminal and the access point 022. Wherein, the first signal strength between the WLAN terminal and the access point 021 may be sent by the access point 021 to the access point 022. For example, the access point 021 may measure the data communication between the WLAN terminal and the WLAN terminal. The signal strength is sent to the access point 022 (or the WLAN terminal measures the signal strength and forwards it to the access point 022 by the access point 021); of course, the controller 01 can also connect the WLAN terminal to the access point 022. The first signal strength between the access points 021 is sent to the access point 022. In practical applications, the first signal strength may be sent by the access point 021 or the controller 01 to the access point 022 together with the initial data communication rate.

It is worth noting that in the process of data communication between the WLAN terminal and the access point 021, the signal sent by the WLAN terminal to the access point 021 may also be received by the access point 022. Therefore, the access point 022 can detect the second signal strength between the WLAN terminal and the access point 022 based on the signal received during the data communication between the WLAN terminal and the access point 021. Of course, the specific implementation of acquiring the second signal strength by the access point 022 is not limited to that obtained by detecting the received signal during data communication between the WLAN terminal and the access point 022. For example, in other embodiments, The wireless signal received by the access point 022 may be a signal sent by the WLAN terminal to any access point in the cell. For example, the wireless signal may be sent to the access point when the WLAN terminal switches to the access point 022. Point 022 wireless signal and so on.

Then, the access point 022 can adjust the initial data communication rate according to the first signal strength and the second signal strength to obtain target data communication data. It is worth noting that in this embodiment, the signal strength between the access point and the WLAN terminal may specifically be the signal-to-noise ratio (SNR) of the wireless signal between the access point and the WLAN terminal, which is determined by the access point or the WLAN terminal. It can be detected; or, the signal strength between the access point and the WLAN terminal can also be the signal to interference and noise ratio (SINR) of the wireless signal between the access point and the WLAN terminal, and it can be detected by the access point or the WLAN terminal. Of course, in other possible implementation manners, the signal strength may also be the reference signal received power (RSRP) or received signal strength indicator (RSSI) of the wireless signal detected by the access point or the WLAN terminal.

In an exemplary embodiment for determining the target data communication rate, the access point 022 may calculate the difference between the first signal strength and the second signal strength, and if the difference is positive, that is, the first signal strength is greater than The second signal strength indicates that the signal quality between the WLAN terminal and the access point 021 is better than the signal quality between the WLAN terminal and the access point 022, and the initial data communication rate can be reduced according to the difference to obtain the target data communication rate At this time, the initial data communication rate is greater than the target data communication rate; and if the difference is negative, that is, the first signal strength is less than the second signal strength, indicating that the signal quality between the WLAN terminal and the access point 021 is worse than that of the WLAN terminal With regard to the signal quality with the access point 022, the initial data communication rate can be increased according to the difference to obtain the target data communication rate. At this time, the initial data communication rate is less than the target data communication rate.

As an example, the initial data communication rate may be increased or decreased by a gradient to obtain the target data communication rate. For example, the difference between the first signal strength and the second signal strength may increase or decrease by a first-order initial data communication every 3db. rate. Taking the signal strength as the signal-to-noise ratio as an example, the first signal strength is specifically the first signal-to-noise ratio, and the second signal strength is specifically the second signal-to-noise ratio. The signal-to-noise ratio difference table, for example, it is assumed that the data communication rate between the access point 022 and the WLAN terminal includes 3 levels (the data communication rate gradually increases from level 1 to level 3), where the data communication rate of level 1 is equal to that of level 2. The signal-to-noise ratio difference between the data communication rates is 2.5db, and the signal-to-noise ratio difference between the second-order data communication rate and the third-order data communication rate is 2.9db, where the first-order data communication rate and, assuming the initial data The communication rate is the first-order data communication rate, and the difference between the first signal-to-noise ratio and the second signal-to-noise ratio is 5db, then, because 2.5db<5db<5.4db (that is, 2.5db+2.9db), connect The entry point 022 can determine to increase the initial data communication rate from the first-order data communication rate to the second-order data communication rate; for example, if the difference between the first signal-to-noise ratio and the second signal-to-noise ratio is 6db, then, Since 6db>5.4db, the access point 022 can determine to increase the initial data communication rate from the first-order data communication rate to the third-order data communication rate. Similarly, when the difference between the first signal-to-noise ratio and the second signal-to-noise ratio is negative, the process of reducing the initial data communication rate can also be a gradient reduction. For example, the initial data communication rate can be reduced from 3 steps. Data communication data is reduced to the second-order data communication rate, or directly reduced to the first-order data communication rate, etc.

In other examples, the initial data communication rate may also be linearly increased or decreased, which is not limited in the embodiment of the present application.

In another exemplary embodiment for determining the target data communication rate, the access point 022 may also calculate the ratio between the first signal strength and the second signal strength, and increase or decrease the initial data communication rate according to the ratio. Wait. Specifically, if the ratio between the first signal strength and the second signal strength is greater than 1, that is, the first signal strength is greater than the second signal strength, it indicates that the signal quality between the WLAN terminal and the access point 021 is better than that between the WLAN terminal and the access point. The signal quality between the in-point 022, the initial data communication rate can be reduced according to the ratio to obtain the target data communication rate; on the contrary, that is, the first signal strength is less than the second signal strength, if the first signal strength and the second signal strength are different The ratio between the two is less than 1, indicating that the signal quality between the WLAN terminal and the access point 021 is inferior to the signal quality between the WLAN terminal and the access point 022, and the initial data communication rate can be increased according to the ratio to obtain the target data communication rate .

Of course, in the above process of adjusting the initial data communication rate, the target data communication rate obtained may have a certain rate limit, that is, the target data communication rate finally obtained cannot be too high or too small. In specific implementation, when increasing the initial data communication rate, if the data communication rate obtained after increasing the initial data communication rate is not greater than the first preset rate, the data communication rate can be used as the target data communication data rate, and if the If the data communication rate is greater than the first preset rate, the first preset rate can be used as the target data communication rate; and when the initial data communication rate is reduced, if the initial data communication rate is reduced, the data communication rate obtained is not less than The second preset rate may be the data communication rate as the target data communication data rate, and if the data communication rate is greater than the second preset rate, the second preset rate may be used as the target data communication rate. Wherein, the first preset rate is greater than the second preset rate.

After the aforementioned adjustment of the initial data communication rate, the access point 022 can communicate with the WLAN terminal based on the target data communication rate obtained by the adjustment, and since the target data communication rate is based on the difference between the WLAN terminal and the access point 022 Therefore, the target data communication rate matches the signal quality between the WLAN terminal and the access point 022. That is, when the access point 022 performs data communication with the WLAN terminal at the target data communication rate, the signal decoding rate matches the data transmission rate, which can effectively reduce the loss of data packets; and, if the WLAN terminal communicates with the access point The signal strength between the points 022 is relatively high, that is, when the signal quality between the WLAN terminal and the access point 022 is good, the data communication rate between the WLAN terminal and the access point 022 can be appropriately increased, thereby improving the WLAN terminal The service performance of the WLAN terminal after switching to the access point 022.

It is worth noting that the initial data communication rate acquired by the access point 022 may specifically be the actual data communication rate when the access point 021 performs data communication with the WLAN terminal for the last time in the first scheduling period. Specifically, during the data communication process with the WLAN terminal during the first scheduling period, the access point 021 can adjust the data communication rate with the WLAN terminal multiple times, and communicate with the WLAN terminal at the adjusted data communication rate. After the first scheduling period ends, the access point 021 can send the actual data communication rate used for the last data communication with the WLAN terminal to the access point 022. Of course, the controller 01 can also send the actual data communication rate to the access point 022. It is sent to the access point 022.

As an example, the access point 021 may adjust the data communication rate between it and the WLAN terminal according to the historical packet error rate (packet error rate) corresponding to the terminal and the current packet error rate. Specifically, during the data communication between the access point 021 and the WLAN terminal in the first scheduling period, the historical message error rate corresponding to the WLAN terminal (which may be a pre-saved message error rate) can be obtained, and at the same time, according to the The data transmission between the access point 021 and the WLAN terminal determines the current message error rate during data transmission. For example, the data frame currently transmitted between the access point 021 and the WLAN terminal aggregates 10 MAC protocol data Unit (MAC protocol data unit, MPDU), of which 8 succeeded and 2 failed, and the current message error rate is 0.2. Then, the access point 021 can adjust the current data communication rate according to the historical message error rate and the current message error rate, and the adjusted data communication rate is used for the next transmission between the access point 021 and the WLAN terminal Data communication during data. Further, after each adjustment of the data communication rate is completed, the current message error rate can also be used to update the historical message error rate. In the first scheduling period, the access point 021 may adjust the data communication rate with the WLAN terminal multiple times based on the foregoing process.

In other possible implementation manners, the initial data communication rate acquired by the access point 022 may also be the actual data communication rate when the access point 021 performs data communication with the WLAN terminal for the last time in the first scheduling period. Adjust the obtained data communication rate. In specific implementation, the access point 021 can determine the actual data communication rate of the last communication when the WLAN terminal is in data communication for the last time in the first scheduling period, and obtain the message error rate corresponding to the WLAN terminal, thereby The actual data communication rate is adjusted based on the message error rate, so that the adjusted actual data communication rate can be used as the initial data communication rate and sent to the access point 022.

In an example of adjusting the actual data communication rate based on the message error rate, the actual data communication rate may be adjusted based on the message error rate and a preset threshold value. Specifically, if the message error rate is greater than the first threshold (such as 0.2, etc.), the actual data communication rate can be reduced to obtain the initial data communication rate, for example, it can be reduced from 54 megabits per second (Mbps) to 48 Mbps Wait. If the message error rate is not greater than the first threshold, and specifically less than the second threshold (such as 0.1, etc.), the actual data communication rate can be increased to obtain the initial data communication rate, for example, it can be increased from 48Mbps to 54Mbps, etc. . When the message error rate is between the first threshold and the second threshold, the actual data communication rate may not be adjusted, that is, the initial data communication rate is the actual data communication rate.

Further, in some possible implementation manners, the access point 021 may also adjust the actual data communication rate in combination with the message error rate and the signal strength when the access point 021 performs data communication with the WLAN terminal. Specifically, when the message error rate is greater than the first threshold, if the signal strength is less than the third threshold, the actual data communication rate can be reduced, and if the signal strength is not less than the third threshold, further statistics on the terminal’s report can be made. Whether the number of times that the text error rate is continuously greater than the preset value is greater than the fourth threshold, if it is, the actual data communication rate can be reduced, and the value of the number of times can be set to zero, if not, the actual data communication rate may not be adjusted, and The value of this number of times is increased by one. When the message error rate is less than the second threshold, if the signal strength is greater than the third threshold, the actual data communication rate can be increased, and if the signal strength is not greater than the third threshold, the terminal's message error rate can be further counted Whether the number of consecutive times greater than the preset value is greater than the fourth threshold, if yes, the actual data communication rate can be increased, and the value of the number of times can be set to zero, if not, the actual data communication rate can be adjusted without adjustment and the number of times The value of plus one. When the message error rate is between the first threshold and the second threshold, if the signal strength is less than the third threshold, the actual data communication rate can be reduced, and if the signal strength is greater than the third threshold, the actual data can be increased Communication rate. It is worth noting that the foregoing process is only used as an exemplary description, and the embodiment of the present application does not limit the specific implementation process of adjusting the actual data communication rate in combination with the message error rate and the signal strength.

In a possible implementation manner, the message error rate corresponding to the WLAN terminal may be specifically calculated according to the historical message error rate corresponding to the WLAN terminal and the current message error rate, where the current message error rate It is the message error rate when the access point 021 performs data communication with the WLAN terminal in the first scheduling period. As an example, the access point 021 may perform a weighted summation of the historical message error rate and the current message error rate to obtain the message error rate corresponding to the WLAN terminal. For example, the message error rate may be (historical message error rate). Error rate * 0.75 + current message error rate * 0.25) etc.

Similar to the access point 021, in the process of communicating with the WLAN terminal during the second scheduling period, the access point 022 may start data communication with the WLAN terminal based on the target data communication rate, and based on the message corresponding to the WLAN terminal The error rate, the first signal strength, and the second signal strength can be adjusted multiple times within the second scheduling period for the data communication rate between the access point 022 and the WLAN terminal, so that the access point 022 is based on the adjusted data each time High-quality communication between the communication rate and the WLAN terminal.

Further, after the second scheduling period ends, the access point 022 may send the reference data communication rate to the next access point with the scheduling period, where the reference data communication rate may be the last time the access point 022 communicates with the WLAN terminal The actual data communication rate used during communication, and for the next access point with a scheduling period, the reference data communication rate is the initial data communication rate received by the access point. For example, in a further possible implementation manner, the WLAN system may further include a third access point, and the access point 022 may send the actual data communication rate of the last communication with the WLAN terminal in the second scheduling period to the The third access point, so that the third access point starts data communication with the WLAN terminal based on the actual data communication rate.

Wherein, the frequency of the working channel of the third access point is the same as that of the access point 021 and the access point 022, and the third access point cannot transmit signals during the first scheduling period and the second scheduling period, but Data communication can be performed with the WLAN terminal during the third scheduling period. Accordingly, neither the access point 021 nor the access point 022 can send signals during the third scheduling period. The third scheduling period may be after the second scheduling period, and The third scheduling period may not overlap with the second scheduling period, or may overlap with the second scheduling period, and during the overlapping period, the access point 022 and the third access point compete to determine which one The access point communicates with the WLAN terminal. In this embodiment, the first scheduling period to the third scheduling period may be managed by the controller 01 and delivered to each corresponding access point.

In other possible implementation manners, the reference data communication rate sent by the access point 022 to the third access point may also be a data communication rate obtained by adjusting the actual data communication rate described above. Specifically, the access point 022 may obtain the actual data communication rate and the message error rate corresponding to the WLAN terminal, and adjust the actual data communication rate based on the message error rate to obtain a new data communication rate for the third access The point may start data communication with the WLAN terminal in the third scheduling period based on the new data communication rate.

Of course, the third scheduling period can also be allocated to the access point 021, that is, after the second scheduling period ends, the access point 022 can send the reference data communication rate to the access point 021, so that the access point 021 can be In the third scheduling period, data communication with the WLAN terminal is started based on the reference data communication rate.

In other possible implementation manners, the reference data communication rate may also be sent by the controller 01 to the next access point with a scheduling period, which is not limited in this embodiment of the application.

Hereinafter, the communication rate control process when each access point in the above-mentioned WLAN system communicates with the WLAN terminal will be described in detail with reference to FIG. 4. Referring to Fig. 4, Fig. 4 shows a schematic flowchart of a communication method in an embodiment of the present application. The method can be applied to the WLAN system shown in Fig. 3 above, and the method can specifically include:

S401: The access point 021 creates a data communication rate table corresponding to the WLAN terminal, and the data communication rate mapping table may be used to determine the data communication rate corresponding to the WLAN terminal.

When an access point accesses a WLAN terminal for the first time, a corresponding data communication rate table can be created for the WLAN terminal. After the data communication rate table corresponding to the WLAN terminal is created, the access point can determine the initial data communication rate corresponding to the WLAN terminal according to the data communication rate table. In this embodiment, the access point 021 creates a data communication rate table for the WLAN terminal as an example.

In an exemplary embodiment, the created data communication rate table may include the identification of the WLAN terminal (such as MAC address, etc.), the mapping relationship between bandwidth, signal strength, and data communication rate, and the data The communication rate table is initialized. Among them, the bandwidth may include a full band (such as 20MHz, 80MHz, etc. working channels) and/or different size subbands (such as 26tone, 52tone, 106tone, etc.). In this way, after the access point 021 accesses the WLAN terminal, the access point 021 can obtain the identity of the WLAN terminal, the bandwidth allocated to the WLAN terminal, and the signal strength between the WLAN terminal and the access point 021. Then, the access point 021 can determine the data communication rate corresponding to the WLAN terminal by querying the data communication rate table.

In a further possible implementation manner, the data communication rate table also includes a message error rate corresponding to the WLAN terminal, so as to determine the data communication rate corresponding to the WLAN terminal based on the message error rate.

Wherein, the access point 021 may allocate bandwidth to the WLAN terminal according to the data length and the priority of data transmission that need to be communicated with the WLAN terminal. When the signal strength in the data communication rate table is specifically the signal-to-noise ratio or the signal-to-interference and noise ratio, the access point 021 can detect the access point 021 according to the association request frame sent by the WLAN terminal when it accesses the WLAN terminal. The signal-to-noise ratio with the WLAN terminal.

S402: The access point 021 starts data communication with the WLAN terminal based on the determined data communication rate in the first scheduling period.

In this embodiment, the controller 01 may allocate a first scheduling period to the access point 021, allocate a second scheduling period to the access point 022, and instruct the access point 021 to be able to perform data communication with the WLAN terminal within the first scheduling period , While the wireless signal cannot be sent in the second scheduling period, the access point 022 can perform data communication with the WLAN terminal in the second scheduling period, but cannot send the wireless signal in the first scheduling period. Wherein, the second scheduling period is after the first scheduling period.

In the first scheduling period, the access point 021 may not directly use the data communication rate obtained from the table lookup as the communication rate for data communication with the WLAN terminal, but adjust the data communication rate, which may be specifically based on the data communication rate. The signal strength recorded in the table and the signal strength between the access point 021 and the WLAN terminal detected in real time, the data communication rate is adjusted, and the adjusted data communication rate is used as the data when communicating with the WLAN terminal Communication rate.

Wherein, the access point 021 may adjust the data communication rate based on the difference or ratio between the above two signal strengths. Taking the difference as an example, the access point 021 can calculate the difference between the two signal strengths, and when the difference is positive, it indicates that the signal quality between the access point 021 and the WLAN terminal is poor, then Decrease the data communication rate obtained by the table lookup, and when the difference is negative, it indicates that the signal quality between the access point 021 and the WLAN terminal is good, and the data communication rate obtained by the table lookup can be increased.

In the first scheduling period, after each data transmission between the access point 021 and the WLAN terminal, the access point 021 can adjust the data communication rate used in the current communication, so that the access point 021 can use the adjustment The next data transmission is performed between the obtained data communication rate and the WLAN terminal, so that the data communication rate between the access point 021 and the WLAN terminal can be matched with its signal quality.

It is worth noting that each time the adjusted data communication rate is obtained based on the signal strength detected in real time and the message error rate, the signal strength and the corresponding adjusted data communication rate can be used to compare the data communication rate in the data communication rate table. The data is updated, specifically, the signal strength, message error rate, and data communication rate in the data communication rate table are correspondingly updated to real-time detected or calculated values, for example, the signal strength in the data communication rate table is updated to The current detected signal strength, etc.

S403: When the first scheduling period ends, the access point 021 may synchronize the data communication rate table to the access point 022.

In this embodiment, the access point 021 may send the updated data communication rate table to the access point 022, so that the access point 022 can determine the relevant data corresponding to the WLAN terminal based on the data communication rate table.

S404: The access point 022 determines the initial data communication rate corresponding to the WLAN terminal and the first signal strength between the WLAN terminal and the access point 021 based on the data communication rate table, and obtains the connection between the access point 022 and the WLAN terminal The second signal strength.

When the WLAN terminal is switched from the access point 021 to the access point 022, the access point 022 can obtain the data length and the priority of the data to be transmitted corresponding to the WLAN terminal, and determine based on the data length and the priority of the data The bandwidth corresponding to the WLAN terminal, so that by looking up the table, the access point 022 can obtain the initial data communication rate corresponding to the WLAN terminal (that is, the data communication rate recorded in the table) and the connection between the WLAN terminal and the access point 021 The first signal strength (that is, the signal strength recorded in the table).

It is worth noting that the initial data communication rate may be the actual data communication rate used for the last data communication between the access point 021 and the WLAN terminal in the first scheduling period, or it may be the use report of the access point 021. The text error rate is the data communication rate obtained after adjusting the actual data communication rate. Further, the message error rate used to adjust the actual data communication rate may be the message error rate recorded by the access point 021 according to the data communication rate table (for ease of description, it is referred to as the historical message error rate below). ) And the message error rate detected by the access point 021 in real time during the first scheduling period (for ease of description, hereinafter referred to as the current message error rate), for example, it is used to adjust the actual data communication rate The message error rate of can be calculated by the weighted sum of the historical message error rate and the current message error rate, where the sum of the two weights is 1.

At the same time, the access point 022 can also obtain the second signal strength between it and the WLAN terminal. In specific implementation, when the access point 022 receives the wireless signal corresponding to any message or data frame sent by the WLAN terminal, the access point 022 can detect the second signal between it and the WLAN terminal based on the received wireless signal strength. The wireless signal sent by the WLAN terminal received by the access point 022 may be a wireless signal sent when the WLAN terminal performs data communication with the access point 021, or it may be sent to the access point 022 when the WLAN terminal requests access. The wireless signal of the association request frame.

S405: The access point 022 adjusts the initial data communication rate according to the first signal strength and the second signal strength to obtain the target data communication rate, and starts data communication with the WLAN terminal based on the target data communication rate in the second scheduling period .

Similar to the access point 021, after the access point 022 obtains the initial data communication rate from the data communication rate table, it can adjust the initial data communication rate based on the signal strength, and start communication with the adjusted initial data communication rate. The WLAN terminal performs data communication. In specific implementation, the access point 022 may calculate the difference (or ratio) between the first signal strength and the second signal strength, and increase or decrease the initial data communication speed based on the difference (or ratio). For example, when the difference is negative, that is, the first signal strength is less than the second signal strength, the initial data communication rate can be increased to obtain a target data communication rate with a larger communication rate, and when the difference is positive, that is, the first signal strength If the signal strength is greater than the second signal strength, the initial data communication rate can be reduced, and the target data communication rate with a smaller communication rate can be obtained.

Further, in the process of adjusting the initial data communication rate, the initial data communication rate may also be adjusted according to a certain gradient according to the difference between the first signal strength and the second signal strength. For example, a table of signal strength differences between two adjacent data communication rates can be preset, so that when the difference between the first signal strength and the second signal strength reaches the corresponding signal strength difference in the table, then The initial data communication rate can be adjusted up or down to the corresponding level of data communication rate, for example, the initial data communication rate can be adjusted down from 54 Mbps to 48 Mbps.

At the same time, when the access point 022 obtains the target data communication rate, it may also use the obtained second signal strength, message error rate, and target data communication rate to update the data communication rate table.

Further, when the second scheduling period ends, the access point 022 may send the reference data communication rate to the next access point with the scheduling period, where the access point has the same access point as the access point 021 and the access point 022 Frequency of the working channel, and the reference data communication rate may be the actual data communication rate used by the access point 022 for data communication with the WLAN terminal for the last time in the second scheduling period, or may be corresponding to the WLAN terminal The message error rate is the data communication rate obtained by adjusting the actual data communication rate. In this way, the access point with the next scheduling period can start data communication with the WLAN terminal in the scheduling period based on the reference data communication rate, the access point can perform data communication with the WLAN terminal in the next scheduling period, and Signals cannot be sent during the first scheduling period and the second scheduling period.

In practical applications, the access point 021 can use the reference data communication rate to update the data communication rate value in the data communication rate table, and send the updated data communication rate table to the next access point with a scheduling period.

In addition, the embodiment of the present application also provides a communication device. Referring to FIG. 5, FIG. 5 shows a schematic structural diagram of a communication device in an embodiment of the present application. The device 500 may be applied to the access point 022 in the above embodiment. The device 500 may include:

The obtaining module 501 is configured to obtain the initial data communication rate, the first signal strength, and the second signal strength corresponding to the wireless local area network WLAN terminal.

Among them, the first signal strength is the signal strength of the wireless signal between the first access point and the WLAN terminal, and the second signal strength is the signal strength of the wireless signal between the second access point and the WLAN terminal. The frequency of the working channel of the access point is the same. The first access point can communicate with the WLAN terminal during the first scheduling time but cannot transmit wireless signals during the second scheduling period. The second access point is in the first scheduling time. The wireless signal cannot be sent within the time period, but data communication with the WLAN terminal can be performed in the second scheduling time period, and the first scheduling time period is after the second scheduling time period;

An adjustment module, configured to adjust the initial data communication rate to the target data communication rate according to the first signal strength and the second signal strength;

The communication module is used to start data communication with the WLAN terminal based on the target data communication rate in the first scheduling period.

In a possible implementation manner, the apparatus 500 further includes:

The sending module is configured to send the reference data communication rate to the third access point, where the reference data communication rate is the actual data communication rate when the first access point performs data communication with the WLAN terminal for the last time in the first scheduling period, or, The data communication rate is determined based on the actual data communication rate and the message error rate.

Wherein, the frequency of the working channel of the third access point is the same as that of the first access point, the third access point cannot transmit wireless signals during the first scheduling period and the second scheduling period, and can For data communication with the WLAN terminal, the third scheduling period is after the first scheduling period.

In a possible implementation manner, the apparatus 500 further includes:

The calculation module is used to calculate the message error rate according to the historical message error rate corresponding to the WLAN terminal and the current message error rate. The current message error rate is the first access point to perform data with the WLAN terminal in the first scheduling period The message error rate during communication.

The communication device applied to the access point 022 provided in the above embodiment is only illustrated by the division of the above-mentioned functional modules. In actual applications, the above-mentioned function allocation can be completed by different functional modules as needed, that is, the internal part of the device The structure is divided into different functional modules to complete all or part of the functions described above. In addition, the communication device provided in the foregoing embodiment belongs to the same concept as the foregoing system embodiment, and its implementation process is detailed in the foregoing system embodiment, which will not be repeated here.

In addition, the embodiment of the present application also provides another communication device. Referring to FIG. 6, FIG. 6 shows a schematic structural diagram of another communication device in an embodiment of the present application. The device 600 may be applied to the controller 01 in the above-mentioned embodiment, and the device 600 may include:

The acquiring module 601 is used to acquire the initial data communication rate and signal strength corresponding to the wireless local area network WLAN terminal. The signal strength is the signal strength of the wireless signal between the second access point and the WLAN terminal. The frequency of the working channel is the same. The first access point can communicate with the WLAN terminal during the first scheduling time but cannot transmit wireless signals during the second scheduling time period. The second access point cannot perform data communication during the first scheduling time period. The wireless signal is sent to be able to communicate with the WLAN terminal in the second scheduling period, and the first scheduling period is after the second scheduling period.

The sending module 602 is configured to send the initial data communication rate and signal strength to the first access point.

The communication device applied to the controller 01 provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above function can be allocated by different functional modules as needed, that is, the internal structure of the device Divide into different functional modules to complete all or part of the functions described above. In addition, the communication device provided in the foregoing embodiment belongs to the same concept as the foregoing system embodiment, and its implementation process is detailed in the foregoing system embodiment, which will not be repeated here.

FIG. 7 is a schematic structural diagram of a wireless communication device provided by an embodiment of the present application. The wireless communication device may be a controller or an access point provided in the foregoing embodiment. Referring to FIG. 7, the wireless communication device may include: a processor 701, a memory 702, a network interface 703, and a bus 704. Wherein, the bus 704 is used to connect the processor 701, the memory 702, and the network interface 703. The communication connection with other devices can be realized through the network interface 703 (which can be wired or wireless). A computer program 7021 is stored in the memory 702, and the computer program 7021 is used to implement various application functions.

It should be understood that, in this embodiment of the present application, the processor 701 may be a CPU or a similar processor.

The memory 702 may include volatile memory, non-volatile memory, or a combination thereof. Among them, non-volatile memory can include read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and Erasing programmable read-only memory (electrically EPROM, EEPROM), flash memory, or any combination thereof. Volatile memory can include random access memory (RAM), such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (synchronous DRAM, SDRAM), and double data rate SDRAM (double data rate SDRAM). data date SDRAM, DDR SDRAM, enhanced SDRAM (enhanced SDRAM, ESDRAM), synchronous link DRAM (synchlink DRAM, SLDRAM), direct memory bus RAM (direct rambus RAM, DR RAM), or any combination thereof.

In addition to the data bus, the bus 704 may also include a power bus, a control bus, a status signal bus, and the like. However, for clear description, various buses are marked as bus 704 in the figure.

The processor 701 may be configured to execute a computer program stored in the memory 702. Wherein, when the wireless communication device is a controller, the processor 701 executes the computer program 7021 to implement the steps executed by the controller in the foregoing embodiment. When the wireless communication device is an access point, the processor 701 executes the computer program 7021 to implement the steps executed by the access point in the foregoing method embodiment.

It should be understood that the communication method provided by the foregoing method embodiment may also be implemented by software. When the method provided by the foregoing method embodiment is implemented by software, each module in the controller and the access point may also be a software module.

The embodiments of the present application also provide a computer-readable storage medium that stores instructions in the computer-readable storage medium, and when the computer-readable storage medium runs on a computer, the computer can execute the method described above by the access Click the step to be performed, or the step to be performed by the controller.

The embodiments of the present application also provide a computer program product containing instructions. When the computer program product runs on a computer, the computer executes the steps performed by the access point in the above method embodiments or the steps performed by the controller. .

The foregoing embodiments may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software or firmware, the above-mentioned embodiments may be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website mobile terminal, computer, server, or data. The center transmits to another website mobile terminal, computer, server or data center through wired (such as coaxial cable, optical fiber, twisted pair) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more sets of media. The medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, an optical disk), or a semiconductor medium. The semiconductor medium may be a solid state drive (SSD).

The terms “first”, “second”, “third”, etc. in the description and claims of the application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments described herein can be implemented in a sequence other than the content illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those clearly listed. Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, the specific working process of the device and unit described above can refer to the corresponding process in the foregoing system embodiment and method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical module division, and there may be other division methods in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be acquired according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, each module unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software module unit.

The foregoing descriptions are only optional embodiments of the present application, and are not intended to limit the present application. The scope of protection of this application is subject to the claims.

Claims

A wireless local area network (WLAN) system, characterized in that the WLAN system includes a controller, a first access point, and a second access point. The first access point and the second access point work The frequency of the channel is the same;

The controller is used to instruct the first access point to be able to perform data communication with the WLAN terminal in the first scheduling period but not to transmit wireless signals in the second scheduling period, and to instruct the second access point The wireless signal cannot be sent in the first scheduling period, but data communication can be performed with the WLAN terminal in the second scheduling period, and the second scheduling period is after the first scheduling period;

The second access point is used to obtain the initial data communication rate, first signal strength, and second signal strength corresponding to the WLAN terminal, and calculate the initial data communication rate according to the first signal strength and the second signal strength. The data communication rate is adjusted to a target data communication rate, and data communication with the WLAN terminal is started based on the target data communication rate within the second scheduling period, wherein the first access point is based on the initial data The communication rate performs data communication with the WLAN terminal within the first scheduling period, the first signal strength is the signal strength of the wireless signal between the first access point and the WLAN terminal, and the second signal The strength is the signal strength of the wireless signal between the second access point and the WLAN terminal.
The system of claim 1, wherein:

When the first signal strength is greater than the second signal strength, the initial data communication rate is greater than the target data communication rate, and when the first signal strength is less than the second signal strength, the The initial data communication rate is less than the target data communication rate.
The system according to claim 1 or 2, characterized in that:

The initial data communication rate is the actual data communication rate when the first access point performs data communication with the WLAN terminal for the last time in the first scheduling period, or based on the actual data communication rate and the report The data communication rate determined by the text error rate.
The system according to claim 3, wherein the message error rate is calculated according to the historical message error rate corresponding to the WLAN terminal and the current message error rate, and the current message error rate is The message error rate when the first access point performs data communication with the WLAN terminal in the first scheduling period.
A communication method, characterized in that the method includes:

The first access point obtains the initial data communication rate, the first signal strength, and the second signal strength corresponding to the wireless local area network (WLAN) terminal. The first signal strength is the wireless connection between the first access point and the WLAN terminal. The signal strength of the signal, the second signal strength is the signal strength of the wireless signal between the second access point and the WLAN terminal, and the working channel of the first access point and the second access point The frequency is the same, the first access point can communicate with the WLAN terminal in the first scheduling time but cannot transmit wireless signals in the second scheduling time period, and the second access point is in the first scheduling time period The wireless signal cannot be sent within, but data communication can be performed with the WLAN terminal in the second scheduling period, and the first scheduling period is after the second scheduling period;

Adjusting, by the first access point, the initial data communication rate to a target data communication rate according to the first signal strength and the second signal strength;

The first access point starts data communication with the WLAN terminal based on the target data communication rate in the first scheduling period.
The method according to claim 5, wherein when the first signal strength is greater than the second signal strength, the initial data communication rate is less than the target data communication rate, and when the first signal strength When the signal strength is less than the second signal strength, the initial data communication rate is greater than the target data communication rate.
The method according to claim 5 or 6, wherein the method further comprises:

The first access point sends the reference data communication rate to a third access point, where the reference data communication rate is the last time the first access point communicates with the WLAN terminal in the first scheduling period The actual data communication rate during data communication, or the data communication rate determined based on the actual data communication rate and the message error rate;

Wherein, the frequency of the working channel of the third access point is the same as that of the first access point, and the third access point cannot transmit wireless signals during the first scheduling period and the second scheduling period. Signal, and can perform data communication with the WLAN terminal in a third scheduling period, the third scheduling period being after the first scheduling period.
The method according to claim 7, wherein the method further comprises:

The first access point calculates the message error rate according to the historical message error rate corresponding to the WLAN terminal and the current message error rate, and the current message error rate is The message error rate during data communication with the WLAN terminal in the first scheduling period.
A communication method, characterized in that the method includes:

The controller obtains the initial data communication rate and signal strength corresponding to the wireless local area network (WLAN) terminal. The signal strength is the signal strength of the wireless signal between the second access point and the WLAN terminal. The frequency of the working channel of the second access point is the same. The first access point can communicate with the WLAN terminal during the first scheduling time but cannot transmit wireless signals during the second scheduling time period. The in-point cannot send wireless signals during the first scheduling period but can communicate with the WLAN terminal during the second scheduling period, and the first scheduling period is after the second scheduling period;

The controller sends the initial data communication rate and the signal strength to the first access point.
A communication device, characterized in that the communication device is applied to a first access point, and the device includes:

The acquiring module is used to acquire the initial data communication rate, the first signal strength, and the second signal strength corresponding to the wireless local area network (WLAN) terminal. The first signal strength is the value of the wireless signal between the first access point and the WLAN terminal Signal strength, the second signal strength is the signal strength of the wireless signal between the second access point and the WLAN terminal, and the frequencies of the working channels of the first access point and the second access point are the same , The first access point can communicate with the WLAN terminal during the first scheduling time but cannot transmit wireless signals during the second scheduling time period, and the second access point is not able to perform data communication with the WLAN terminal during the first scheduling time period. Be able to send wireless signals and be able to communicate with the WLAN terminal during the second scheduling period, the first scheduling period being after the second scheduling period;

An adjustment module, configured to adjust the initial data communication rate to a target data communication rate according to the first signal strength and the second signal strength;

The communication module is configured to start data communication with the WLAN terminal based on the target data communication rate in the first scheduling period.
A communication device, characterized in that the communication device is applied to a controller, and the method includes:

The acquiring module is used to acquire the initial data communication rate and signal strength corresponding to the wireless local area network (WLAN) terminal, where the signal strength is the signal strength of the wireless signal between the second access point and the WLAN terminal, and the first access point The frequency of the working channel of the second access point is the same, and the first access point can communicate with the WLAN terminal during the first scheduling time but cannot transmit wireless signals during the second scheduling time period. The second access point cannot transmit wireless signals during the first scheduling period but can communicate with the WLAN terminal during the second scheduling period, and the first scheduling period is in the second scheduling period after that;

The sending module is configured to send the initial data communication rate and the signal-to-noise ratio to the first access point.
A computer-readable storage medium, characterized in that instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium runs on a computer, the computer can execute any one of claims 5 to 8 The communication method described above, or the communication method described in claim 9.