Wireless communication system and wireless communication method

Abstract

Provided is a wireless communication system, applied to the field of wireless communications. The wireless communication system comprises a plurality of access points (APs). The plurality of APs include a first AP, a second AP, and a third AP. The plurality of APs comprise the same basic service set identifier (BSSID). A first communication link is established between the first AP and a station (STA). An access controller (AC) for managing the plurality of APs is used for sending a second management and control instruction to the second AP. The second management and control instruction comprises related information of the STA. The second AP is used for not replying to a wireless signal of the STA on the basis of the second management and control instruction. After determining that the STA needs to communicate with the third AP, the AC is further used for sending connection information of the STA to the third AP. The third AP is used for establishing a third communication link with the STA on the basis of the connection information of the STA. In the technical solution provided by the present application, the plurality of APs are divided into a plurality of AP groups, so that other AP groups do not perform communication management and control on the STA, thereby increasing the number of STAs connected to the wireless communication system.

Description

Wireless communication system and wireless communication method

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on November 29, 2023, with application number 202311622227.5 and invention name “Wireless Communication System and Wireless Communication Method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of wireless communications, and in particular to a wireless communication system and a wireless communication method. Background Art

[0003] In wireless communication systems, to achieve seamless roaming, multiple APs use the same basic service set identifier (BSSID). Stations (STAs) cannot distinguish between different access points (APs). This can lead to communication confusion between STAs and APs. For example, an STA associates with AP1 and sends an uplink message to AP1. Both AP1 and AP2 receive the uplink message. Because the BSSIDs are the same, both AP1 and AP2 believe they are the recipients of the data message. After successful reception, both AP1 and AP2 send an ACK to the STA. These two ACKs can cause an air interface conflict. If the STA cannot parse the ACK, it will repeatedly send the uplink message. Therefore, the wireless communication system needs to manage and control communication between AP2 and STAs. Specifically, AP2 obtains the STA's connection information and, based on this information, creates a virtual user corresponding to the STA. AP2 does not reply to the virtual user's uplink messages, thus avoiding communication confusion. Virtual users occupy corresponding resources. Before communication management is implemented through virtual users, the number of STAs accessible to the wireless communication system is the product of N and M, where N is the number of APs in the wireless communication system. M is the maximum number of STAs that can be connected to a single AP. After communication control is performed, the number of STAs that can be connected to the wireless communication system is M.

[0004] Therefore, communication control will reduce the carrying capacity of wireless communication systems.

[0005] Summary of the Invention

[0006] The present application provides a wireless communication system and a wireless communication method, which divide multiple APs into multiple AP groups so that other AP groups do not perform communication control on STAs, thereby increasing the number of STAs connected to the wireless communication system.

[0007] In a first aspect, the present application provides a wireless communication system. The wireless communication system includes multiple access points (APs). The multiple APs include a first AP, a second AP, and a third AP. The multiple APs include the same BSSID. A first communication link is established between the first AP and the STA. An access controller (AC) that manages the multiple APs is used to send a second control instruction to the second AP. The second control instruction includes relevant information about the STA. The second AP is used to not reply to the wireless signal of the STA according to the second control instruction. After determining that the STA needs to communicate with the third AP, the AC is also used to send the connection information of the STA to the third AP. The third AP is used to establish a third communication link with the STA based on the connection information of the STA.

[0008] In this application, the number of STAs that can be connected to the wireless communication system is equal to K×M. K is the number of AP groups. M is the number of STAs that can be connected to a single AP. Therefore, the embodiments of this application can increase the number of STAs that can be connected to the wireless communication system.

[0009] In an optional manner of the first aspect, the first communication link and the third communication link have the same frequency. The AC is further configured to send a first control instruction to the first AP. The first control instruction includes an identifier of the STA. The first AP is configured to disconnect the first communication link according to the first control instruction. Disconnecting the first communication link can avoid communication confusion, thereby improving the reliability of wireless communication.

[0010] In an optional manner of the first aspect, the first AP is further configured to not reply to the wireless signal of the STA according to the first control instruction. By controlling the wireless signal of the STA through the first AP, the possibility of communication confusion can be reduced.

[0011] In an optional embodiment of the first aspect, the multiple APs include a first AP group and a second AP group. The first AP group includes a first AP and a second AP. The second AP group includes a third AP. The first AP group and the second AP group have different wireless communication frequencies. The APs in the same AP group have the same wireless communication frequency. The first AP and the second AP have the same wireless communication frequency. The first AP and the third AP have different wireless communication frequencies. Dividing AP groups by wireless communication frequency prevents the same wireless signal from a STA from being received by APs in both AP groups, thereby reducing the possibility of communication confusion.

[0012] In an optional embodiment of the first aspect, before the third AP and the STA establish a third communication link, the third AP is further configured to delete relevant information about the other STA. Before deleting the relevant information about the other STA, the third AP does not respond to the wireless signal from the other STA, that is, the third AP manages the wireless signal of the other STA. By deleting the relevant information about the other STA, the number of STAs that establish non-virtual links with the third AP can be increased. Therefore, the present application can increase the number of STAs connected to the wireless communication system.

[0013] In an optional embodiment of the first aspect, the multiple APs further include a fourth AP. After the third AP establishes a third communication link with the STA, if the signal strength between the STA and the fourth AP exceeds a threshold, the AC is further configured to send a fourth control instruction to the fourth AP. The fourth control instruction includes relevant information about the STA. The fourth AP is configured to not respond to the STA's wireless signal in accordance with the fourth control instruction. AP groups are divided based on signal strength, thereby reducing the possibility of communication confusion.

[0014] In an optional embodiment of the first aspect, after a third AP establishes a third communication link with a STA, if the number of STAs managed by a fourth AP is less than a threshold, the AC is further configured to send a fourth control instruction to the fourth AP, the fourth control instruction including relevant information about the STA. The fourth AP is configured to not respond to the STA's wireless signal in accordance with the fourth control instruction. Determining whether to respond to the STA's wireless signal based on the number of managed STAs can improve the efficiency of STA roaming to the fourth AP. Therefore, this application can improve STA roaming efficiency.

[0015] In an optional manner of the first aspect, the relevant information of the STA is the media access control (MAC) address of the STA. The AC is also used to send an intra-group roaming instruction to the fourth AP. The intra-group roaming instruction includes the connection information of the STA. The fourth AP is also used to establish a fourth communication link with the STA based on the connection information of the STA. The AC is also used to send a third control instruction to the third AP. The third control instruction includes the identifier of the STA. The third AP is also used to disconnect the third communication link according to the third control instruction and not respond to the wireless signal of the STA. Controlling the wireless signal of the STA through the MAC address of the STA can improve the control efficiency and reduce the use of resources of the AP.

[0016] In an optional manner of the first aspect, the relevant information of the STA is the connection information of the STA. The AC is further configured to send an intra-group roaming instruction to the fourth AP. The intra-group roaming instruction includes the identifier of the STA. The fourth AP is further configured to reply to the STA's wireless signal according to the intra-group roaming instruction. The AC is further configured to send a third control instruction to the third AP. The third control instruction includes the identifier of the STA. The third AP is further configured to disconnect the third communication link according to the third control instruction and not reply to the STA's wireless signal. Controlling the STA's wireless signal through the STA's connection information, that is, controlling the STA's wireless signal through a virtual user or a virtual link, can improve the efficiency of the STA roaming to the third AP.

[0017] A second aspect of the present application provides a wireless communication method. The wireless communication method includes the following steps: an AC sends a second control instruction to a second AP among multiple APs, the second control instruction including relevant information of a STA, the multiple APs including a first AP, a second AP, and a third AP, the first AP and the STA establish a first communication link, the second control instruction is used to cause the second AP to not reply to the STA's wireless signal according to the second control instruction, and after determining that the STA needs to communicate with the third AP, the AC sends the STA's connection information to the third AP, the STA's connection information is used by the third AP to establish a third communication link with the STA according to the STA's connection information.

[0018] In an optional manner of the second aspect, the wireless communication method further includes the following steps: the AC sends a first control instruction to the first AP, the first control instruction includes an identifier of the STA, and the first control instruction is used by the first AP to disconnect the first communication link according to the first control instruction.

[0019] In an optional manner of the second aspect, the first control instruction is further used to prevent the first AP from replying to the wireless signal of the STA.

[0020] In an optional manner of the second aspect, the multiple APs include a first AP group and a second AP group. The first AP group includes the first AP and the second AP, and the second AP group includes a third AP. The first AP group and the second AP group have different wireless communication frequencies. The APs in the same AP group have the same wireless communication frequency.

[0021] In an optional manner of the second aspect, the multiple APs also include a fourth AP, and the wireless communication method also includes the following steps: after the third AP establishes a third communication link with the STA, if the signal strength between the STA and the fourth AP is greater than a threshold, the AC sends a fourth control instruction to the fourth AP, the fourth control instruction includes relevant information of the STA, and the fourth control instruction is used for the fourth AP to not reply to the STA's wireless signal according to the fourth control instruction.

[0022] In an optional embodiment of the second aspect, the wireless communication method also includes the following steps: after the third AP establishes a third communication link with the STA, if the number of STAs controlled by the fourth AP is less than a threshold, the AC is also used to send a fourth control instruction to the fourth AP, the fourth control instruction including relevant information of the STA, and the fourth control instruction is used for the fourth AP not to reply to the wireless signal of the STA according to the fourth control instruction.

[0023] In an optional method of the second aspect, the relevant information of the STA is the MAC address of the STA, and the wireless communication method also includes the following steps: the AC sends an intra-group roaming instruction to the fourth AP, the intra-group roaming instruction includes the connection information of the STA, and the intra-group roaming instruction is used for the fourth AP to establish a fourth communication link with the STA based on the connection information of the STA, and the AC sends a third control instruction to the third AP, the third control instruction includes the identifier of the STA, and the third control instruction is used for the third AP to disconnect the third communication link according to the third control instruction and not respond to the wireless signal of the STA.

[0024] In an optional method of the second aspect, the relevant information of the STA is the connection information of the STA, and the wireless communication method also includes the following steps: the AC sends an intra-group roaming instruction to the fourth AP, the intra-group roaming instruction includes the identifier of the STA, and the intra-group roaming instruction is used for the fourth AP to reply to the wireless signal of the STA according to the intra-group roaming instruction, and the AC sends a third control instruction to the third AP, the third control instruction includes the identifier of the STA, and the third control instruction is used for the third AP to disconnect the third communication link according to the third control instruction and not reply to the wireless signal of the STA.

[0025] The third aspect of the present application provides an AC. The AC includes a first sending unit and a second sending unit. The first sending unit is used to send a second control instruction to a second AP among multiple APs, the second control instruction including relevant information of a STA, the multiple APs including a first AP, a second AP, and a third AP, the first AP and the STA establish a first communication link, the second control instruction is used for the second AP not to reply to the STA's wireless signal according to the second control instruction, after determining that the STA needs to communicate with the third AP, the second sending unit is used to send the STA's connection information to the third AP, and the STA's connection information is used for the third AP to establish a third communication link with the STA according to the STA's connection information.

[0026] In an optional manner of the third aspect, the first sending unit is further used to send a first control instruction to the first AP, the first control instruction includes an identifier of the STA, and the first control instruction is used for the first AP to disconnect the first communication link according to the first control instruction.

[0027] In an optional manner of the third aspect, the first control instruction is also used to prevent the first AP from replying to the wireless signal of the STA.

[0028] In an optional manner of the third aspect, the multiple APs include a first AP group and a second AP group. The first AP group includes the first AP and the second AP, and the second AP group includes the third AP. The first AP group and the second AP group have different wireless communication frequencies. The APs in the same AP group have the same wireless communication frequency.

[0029] In an optional method of the third aspect, the multiple APs also include a fourth AP. After the third AP establishes a third communication link with the STA, if the signal strength between the STA and the fourth AP is greater than a threshold, the first sending unit is also used to send a fourth control instruction to the fourth AP. The fourth control instruction includes relevant information of the STA. The fourth control instruction is used for the fourth AP to not reply to the STA's wireless signal according to the fourth control instruction.

[0030] In an optional method of the third aspect, after the third AP establishes a third communication link with the STA, if the number of STAs controlled by the fourth AP is less than a threshold, the first sending unit is also used to send a fourth control instruction to the fourth AP, the fourth control instruction including relevant information of the STA, and the fourth control instruction is used for the fourth AP not to reply to the wireless signal of the STA according to the fourth control instruction.

[0031] In an optional method of the third aspect, the relevant information of the STA is the MAC address of the STA, and the first sending unit is also used to send an intra-group roaming instruction to the fourth AP, the intra-group roaming instruction includes the connection information of the STA, and the intra-group roaming instruction is used for the fourth AP to establish a fourth communication link with the STA based on the connection information of the STA. The first sending unit is also used to send a third control instruction to the third AP, the third control instruction includes the identifier of the STA, and the third control instruction is used for the third AP to disconnect the third communication link according to the third control instruction and not reply to the wireless signal of the STA.

[0032] In an optional method of the third aspect, the relevant information of the STA is the connection information of the STA, and the first sending unit is also used to send an intra-group roaming instruction to the fourth AP, the intra-group roaming instruction includes the identifier of the STA, and the intra-group roaming instruction is used for the fourth AP to reply to the STA's wireless signal according to the intra-group roaming instruction. The first sending unit is also used to send a third control instruction to the third AP, the third control instruction includes the identifier of the STA, and the third control instruction is used for the third AP to disconnect the third communication link according to the third control instruction and not reply to the STA's wireless signal.

[0033] In a fourth aspect, the present application provides an AC, which includes a processor and a transceiver, wherein the processor is configured to obtain connection information of a STA and control the transceiver to execute the method in the second aspect or any optional manner of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a first structural diagram of a wireless communication system provided in an embodiment of the present application;

[0035] FIG2 is a schematic diagram of a first flow chart of a wireless communication method provided in an embodiment of the present application;

[0036] FIG3 is a second schematic flow chart of the wireless communication method provided in an embodiment of the present application;

[0037] FIG4 is a second schematic structural diagram of a wireless communication system provided in an embodiment of the present application;

[0038] FIG5 is a third structural diagram of the wireless communication method provided in an embodiment of the present application;

[0039] FIG6 is a third structural diagram of a wireless communication system provided in an embodiment of the present application;

[0040] FIG7 is a fourth structural diagram of a wireless communication method provided in an embodiment of the present application;

[0041] FIG8 is a first structural diagram of an AC provided in an embodiment of the present application;

[0042] FIG9 is a second structural diagram of the AC provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The present application provides a wireless communication system and a wireless communication method. By dividing multiple APs into multiple AP groups, other AP groups can be prevented from performing communication control on STAs, thereby increasing the number of STAs that can be connected to the wireless communication system. It should be understood that the terms "first", "second", etc. used in this application are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, for the sake of simplicity and clarity, reference numbers and / or letters are repeated in multiple figures of this application. Repetition does not indicate a strict limit relationship between various embodiments and / or configurations.

[0044] The wireless communication system in this application is applied to the field of wireless communications. In the field of wireless communications, to improve the coverage of wireless signals, a wireless communication system can be formed by multiple APs and an AC that manages multiple APs. In a wireless communication system, multiple APs include the same BSSID. STAs cannot distinguish between different APs. Communication between STAs and APs may be chaotic. To this end, when AP1 among multiple APs associates with a STA, the other APs among the multiple APs need to establish virtual users corresponding to the STA. The other APs manage the STA's wireless signals through the virtual users corresponding to the STA. Virtual users occupy corresponding resources, thereby reducing the carrying capacity of the wireless communication system.

[0045] To this end, the present application provides a wireless communication system. Figure 1 is a first structural schematic diagram of the wireless communication system provided in an embodiment of the present application. As shown in Figure 1, the wireless communication system includes AC 101 and multiple APs. The multiple APs include a first AP, a second AP, and a third AP. AC 101 is connected to the multiple APs. The connection method can be optical fiber, electrical signal line, or wireless. For example, the wireless communication system is a passive optical network (PON) system, AC 101 is an optical line terminal (OLT) in the PON system, and the multiple APs are optical network units (ONUs) in the PON system. For another example, AC 101 is a master (fiber to the room, FTTR) device. The multiple APs are slave FTTR devices. For another example, AC 101 is a main router in a mesh network. The multiple APs are sub-routers in the mesh network. The multiple APs include the same BSSID. In actual applications, each AP can include multiple VAPs. Each VAP corresponds to a different BSSID. Therefore, each AP can include multiple BSSIDs. When an AP includes multiple BSSIDs, "multiple APs including the same BSSID" means that the multiple APs include at least one identical BSSID. A first AP and a second AP belong to a first AP group. A third AP belongs to a second AP group. The signal coverage of the first AP overlaps with the signal coverage of the second AP. The signal coverage of the second AP overlaps with the signal coverage of the third AP.

[0046] It should be understood that Figure 1 is only an example of the wireless communication system provided in an embodiment of the present application. In actual applications, those skilled in the art will be able to adaptively modify the wireless communication system as needed. For example, the first AP serves as an AC that manages multiple APs. For another example, the second AP group also includes a fourth AP. For another example, the wireless communication system also includes a fifth AP. The fifth AP belongs to the third AP group. The functions of AC 101 and multiple APs in the wireless communication system are described below using the wireless communication system in Figure 1 as an example. Figure 2 is a first flow chart of the wireless communication method provided in an embodiment of the present application. As shown in Figure 2, the wireless communication method includes the following steps.

[0047] In step 201, the AC receives connection information of a STA from a first AP.

[0048] A first communication link is established between the first AP and the STA, that is, the first AP and the STA are associated. The STA is a non-virtual user of the first AP. The first communication link is a wireless communication link. The STA connects to the network through the first AP, that is, the STA transmits uplink signals through the first AP and receives downlink signals from the first AP. An AP among multiple APs can also be associated with other STAs. In the embodiment of the present application, a wireless communication method is described using a STA associated with the first AP as an example. During the process of establishing the first communication link between the first AP and the STA, the first AP can obtain the STA's connection information from the STA. The STA's connection information can include the STA's MAC address, capability information, key information, aggregation information, etc. Other APs, such as the second AP, can establish a pre-connection of the STA using the STA's connection information. The STA can roam to the AP with the pre-connection without noticing. The AC receives the STA's connection information from the first AP. It should be understood that when the first AP is an AC that manages multiple APs, the wireless communication method can skip step 201.

[0049] In step 202, the AC sends STA related information to the second AP.

[0050] The AC sends a group control instruction to all APs in the first AP group except the first AP. The group control instruction includes STA-related information. The STA-related information can be the STA's MAC address or STA connection information. All APs in the first AP group except the first AP are referred to as other APs in the group. In this embodiment of the present application, the first AP and the second AP belong to the first AP group. Therefore, the other APs in the group include the second AP.

[0051] In step 203, the second AP does not reply to the wireless signal of the STA according to the relevant information of the STA.

[0052] APs in other groups do not respond to STA's wireless signals based on group control instructions. For example, the relevant information of STA is the MAC address of STA. When the source address of the wireless signal received by APs in other groups is the MAC address of STA, APs in other groups discard the wireless signal. For another example, the relevant information of STA is the connection information of STA. APs in other groups establish virtual users corresponding to STA based on the connection information of STA, that is, APs in other groups establish virtual links with STA based on the connection information of STA. Virtual user means that AP pre-connects with STA based on the connection information of STA, that is, AP simulates creating an associated user information, but AP does not interact with the STA, so it is a virtual user. On the contrary, the user who actually interacts with STA is a real user. APs in other groups do not respond to the wireless signals of virtual users, that is, APs in other groups control the wireless signals of STA by establishing virtual users.

[0053] In step 204, the AC sends the STA's connection information to the third AP.

[0054] The AC determines whether the STA needs to communicate with a third AP. After the AC determines that the STA needs to communicate with the third AP, the AC sends the STA's connection information to the third AP. After the AC determines that the STA does not need to communicate with the third AP, the AC does not send the STA's connection information to the third AP. The embodiments of the present application do not limit the method by which the AC determines whether the STA needs to communicate with the third AP. Several examples of how the AC determines whether the STA needs to communicate with the third AP are described below.

[0055] In the first example, the wireless communication frequencies of the APs in the first AP group and the APs in the second AP group are different. The APs in the first AP group use a first communication frequency. The APs in the second AP group use a second communication frequency. After a STA establishes a first communication link with the first AP, the STA communicates with the first AP using wireless signals at the first communication frequency. The STA transmits information to the AC through the first AP that the STA needs to switch to the second communication frequency. After receiving this information, the AC determines that the STA needs to communicate with a third AP. If the AC does not receive this information, the AC determines that the STA does not need to communicate with the third AP.

[0056] In the second example, the wireless communication frequencies of the APs in the first AP group and the APs in the second AP group are different. The APs in the first AP group use a first communication frequency. The APs in the second AP group use a second communication frequency. After a STA associates with the first AP, the STA communicates with the first AP using the first communication frequency. The AC is able to obtain the STA's location information. When the distance between the STA and the first AP is greater than a threshold and the distance between the STA and a third AP is less than a threshold, the AC determines that the STA needs to communicate with the third AP. When the distance between the STA and the third AP is greater than the threshold, the AC determines that the STA does not need to communicate with the third AP. After the AC determines that the STA needs to communicate with the third AP, the AC also sends a frequency switching notification to the STA through the first AP.

[0057] In the third example, the wireless communication frequency of the APs in the first AP group is the same as the wireless communication frequency of the APs in the second AP group. After the STA associates with the first AP, the STA's location changes. Before the STA moves, the signal strength between the STA and the third AP is less than a threshold, while the signal strength between the STA and the first AP is greater than a threshold. AC 101 determines that the STA does not need to communicate with the third AP based on the signal strengths between the STA and the third AP and the first AP. After the STA moves, the signal strength between the STA and the third AP is greater than the threshold, while the signal strength between the STA and the first AP is less than the threshold. AC 101 determines that the STA needs to communicate with the third AP based on the signal strengths between the STA and the third AP and the first AP.

[0058] In the fourth example, the wireless communication frequency of the APs in the first AP group is the same as the wireless communication frequency of the APs in the second AP group. After the STA associates with the first AP, the STA's location changes. Before the STA moves, the distance between the STA and the third AP is greater than a threshold. When the distance between the STA and the third AP is greater than the threshold, AC 101 determines that the STA does not need to communicate with the third AP. After the STA moves, the distance between the STA and the third AP is less than the threshold. When the distance between the STA and the third AP is less than the threshold, AC 101 determines that the STA needs to communicate with the third AP.

[0059] In step 205, the third AP establishes a third communication link with the STA according to the connection information of the STA.

[0060] After the third AP obtains the STA's connection information from the AC, it establishes a third communication link with the STA using the STA's connection information, effectively associating the third AP with the STA. The third AP and the first AP share the same BSSID. The STA can roam from the first AP to the third AP without noticing. After roaming to the third AP, the STA connects to the network through the third AP. This means the STA transmits uplink signals through the third AP and receives downlink signals from the third AP. Before and after roaming, wireless signals sent by the STA use the same BSSID as the destination address. This means the first wireless signal sent by the STA to the first AP and the third wireless signal sent by the STA to the third AP share the same BSSID.

[0061] In an embodiment of the present application, the number of STAs accessible to the wireless communication system is equal to K×M. K is the number of AP groups. M is the number of STAs accessible to a single AP. Therefore, the embodiment of the present application can increase the number of STAs connected to the wireless communication system. In actual applications, an AP can include N VAPs. N is an integer greater than 1. Each of the N VAPs uses the same BSSID as the VAPs in other APs to form a network. In this case, the number of STAs accessible to the wireless access system is equal to K×M×N. K is the number of AP groups. M is the number of STAs accessible to a single VAP. In this application, the wireless communication system and wireless communication method will be described using one VAP in an AP or an AP that does not include a VAP as an example.

[0062] 1 , the plurality of APs include a first AP group and a second AP group. The following is an exemplary description of the manner in which the AP groups are divided in the embodiment of the present application.

[0063] In the first method, the AC divides multiple APs into multiple AP groups based on the frequencies of the APs. APs in different AP groups use different wireless communication frequencies, and APs in the same AP group use the same wireless communication frequency. For example, in Figure 1, the wireless communication frequency of the first AP is the same as the wireless communication frequency of the second AP. The wireless communication frequency of the first AP is different from the wireless communication frequency of the third AP. The APs in the first AP group use the first communication frequency. The APs in the second AP group use the second communication frequency. For example, the first communication frequency is channel 36 and the frequency is 5180 Mega Hertz (MHz); the second communication frequency is channel 149 and the frequency is 5745 MHz. The first communication frequency and the second communication frequency do not interfere with each other.

[0064] In the second method, the AC divides multiple APs into multiple AP groups based on their operating time slots. APs in the same AP group have the same operating time slot. APs in different AP groups have different operating time slots. For example, in Figure 1, the operating time slots of the APs in the first AP group are the first time slots. The operating time slots of the APs in the second AP group are the second time slots. The first and second time slots are distributed alternately.

[0065] In the third approach, the AC divides multiple APs into multiple AP groups based on the signal strengths between STAs and the APs. The signal strengths between the APs and STAs in the first AP group are greater than a threshold, while the signal strengths between the APs and STAs in other AP groups are less than or equal to the threshold. For example, in Figure 1 , the first signal strength between the first AP and the STA is greater than the threshold, the second signal strength between the second AP and the STA is greater than the threshold, and the third signal strength between the third AP and the STA is less than the threshold.

[0066] It should be understood that the above description of the method for dividing AP groups in the embodiments of the present application is illustrative. The embodiments of the present application do not limit the method by which the AC divides AP groups. For example, in actual applications, the AC can divide AP groups based on the spatial location of multiple APs, the antenna beam directions of multiple APs, or the protocol isolation content of multiple APs. In order to reduce the possibility of communication confusion, after grouping multiple APs.

[0067] In actual applications, the factors that affect the AC's division of AP groups may change. For example, the wireless communication frequency of a certain AP changes, or the position movement of the STA causes the signal strength between the STA and multiple APs to change. In order to improve the reliability of communication management and control, the AC can dynamically update the AP group. Specifically, when the factors that affect the AC's division of AP groups change, the AC re-divides the AP groups. For example, in the example of Figure 1, before the factors that affect the AC's division of AP groups change, the first AP and the second AP use the first communication frequency, and the first AP and the second AP belong to the first AP group. The third AP uses the second communication frequency, and the third AP belongs to the second AP group. After the factors that affect the AC's division of AP groups change, the second AP uses the first communication frequency, and the second AP belongs to the first AP group. The second AP and the third AP use the second communication frequency, and the second AP and the third AP belong to the second AP group.

[0068] In the description of Figure 2, the STA establishes a third communication link with the third AP. After the STA establishes the third communication link with the third AP, the AC can disconnect the first communication link. This is described below. Figure 3 is a second flow chart of the wireless communication method provided in an embodiment of the present application. As shown in Figure 3, the wireless communication method includes the following steps.

[0069] In step 301, the AC sends a first control instruction to a first AP.

[0070] The first control instruction includes the identifier of the STA. The embodiment of the present application does not limit the specific format and specific content of the first control instruction.

[0071] In step 302, the first AP deletes the connection information of the STA according to the first control instruction.

[0072] In Figure 2, the first and second APs belong to the first AP group, and the third AP belongs to the second AP group. A third communication link is established between the third AP and the STA. The first AP is also called the source AP, and the third AP is also called the destination AP. The source AP can perform different processing based on the first control instruction. This is described below with an example.

[0073] In the first method, the source AP disconnects the first communication link according to the first control instruction and deletes the connection information of the STA. Before the STA roams to the third AP, the STA establishes a first communication link with the first AP and saves the connection information of the STA. During the process of the STA roaming to the third AP, or after the STA roams to the third AP, the source AP disconnects the first communication link according to the first control instruction and deletes the connection information of the STA. APs in different groups from the destination AP are called other-group APs. The first AP is the other-group AP. When the communication frequencies of the first AP and the third AP are the same, after the other-group AP disconnects the first communication link, if the other-group AP receives a wireless signal from the STA, the other-group AP can process the wireless signal of the STA normally. For example, after the other-group AP successfully parses the wireless signal of the STA, the other-group AP replies with an ACK frame to the STA.

[0074] In the second method, the source AP determines whether the first AP group includes redundant resources. If the first AP group includes redundant resources, the source AP does not respond to the STA's wireless signal according to the first control instruction. If the first AP group does not include redundant resources, the source AP disconnects the first communication link. For example, when the processor resources, storage resources, or radio frequency resources of the first AP group are less than a threshold, the source AP determines that the first AP group includes non-redundant resources. When the processor resources, storage resources, or radio frequency resources of the first AP group are greater than or equal to a threshold, the source AP determines that the first AP group includes redundant resources. For another example, when the number of STAs managed by the first AP group is greater than or equal to a threshold, the source AP determines that the first AP group includes non-redundant resources. The STAs managed by the first AP group include virtual users and non-virtual users. Non-virtual users are STAs that have established communication links with the AP. Non-virtual users communicate with the AP via communication links. For example, the first AP has established virtual users corresponding to 8 STAs and non-virtual users corresponding to 2 STAs. The second AP has established virtual users corresponding to 2 STAs and non-virtual users corresponding to 8 STAs. As shown in the description of FIG2 , when a STA establishes a communication link with an AP, APs in other groups will establish virtual users corresponding to the STA. Therefore, there is a one-to-one correspondence between the non-virtual users corresponding to the eight STAs and the virtual users corresponding to the eight STAs, and a one-to-one correspondence between the non-virtual users corresponding to the two STAs and the virtual users corresponding to the two STAs. At this point, the number of STAs managed by the first AP group equals the sum of the number of virtual users and the number of non-virtual users. When the number of STAs managed by the first AP group falls below a threshold, the source AP determines that the first AP group includes redundant resources. Similarly, as shown in FIG2 , APs in other groups can manage the wireless signals of STAs using virtual users. APs in other groups can also manage the wireless signals of STAs based on the MAC addresses of the STAs. Therefore, the STAs managed by the first AP group can include managed users and non-virtual users. A managed user refers to an STA whose wireless communication is managed by the AP using its MAC address. At this point, the number of STAs managed by the first AP group equals the sum of the number of managed users and the number of non-virtual users. The source AP's failure to respond to the STA's wireless signal in accordance with the first management instruction means that the source AP manages the STA's wireless signal in accordance with the first management instruction. For example, the source AP converts the first communication link into a virtual link, and the source AP manages and controls the wireless signal of the STA by establishing a virtual user. In another example, the source AP manages and controls the wireless signal of the STA based on the MAC address of the STA.

[0075] In the third method, the source AP retains the first communication link. If the frequencies of the first and second AP groups differ, and a STA has two radios operating at different frequencies, the STA can associate with both the first and third APs simultaneously. If the STA associates with the third AP by switching frequencies, it can associate with the first AP by switching frequencies again.

[0076] In step 303, the AC sends a second control instruction to the second AP.

[0077] The AC sends a second control instruction to other APs in the AP group where the source AP is located. The second control instruction includes the identifier of the STA. The embodiment of the present application does not limit the specific format and content of the second control instruction.

[0078] In step 304, the second AP deletes the connection information of the STA according to the second control instruction.

[0079] Other APs in the AP group where the source AP is located can perform different processing according to the second control instruction. For example, other APs do not control the wireless signal of the STA according to the second control instruction and delete the relevant information of the STA. For another example, other APs determine whether the first AP group includes redundant resources. When the first AP group includes redundant resources, other APs do not reply to the wireless signal of the STA according to the second control instruction, that is, other APs continue to control the wireless signal of the STA according to the second control instruction. When the first AP group does not include redundant resources, other APs do not control the wireless signal of the STA according to the second control instruction. For the description of redundant resources, please refer to the description of the source AP determining whether the first AP group includes redundant resources in the aforementioned step 302. For the description of other APs controlling the wireless signal of the STA, please refer to the description of step 203 in the aforementioned Figure 2.

[0080] In the example of FIG3 , the multiple APs include a first AP group and a second AP group. The APs in the first AP group can determine whether the first AP group includes redundant resources and determine whether to control the wireless signals of the STA based on the redundant resources. In actual applications, the multiple APs can also include a third AP group. Regarding the description of whether the APs in the third AP group control the wireless signals of the STA, reference can be made to the description of whether the APs in the first AP group control the wireless signals of the STA. For example, the APs in the third AP group can determine whether the third AP group includes redundant resources and determine whether to control the wireless signals of the STA based on the redundant resources. When the third AP group includes redundant resources, the APs in the third AP group control the wireless signals of the STA. When the third AP group does not include redundant resources, the APs in the third AP group do not control the wireless signals of the STA. The control status of the wireless signals of the STA by the third AP group and the first AP group can be independent of each other. For example, the APs in the first AP group control the wireless signals of the STA, while the APs in the third AP group do not control the wireless signals of the STA.

[0081] According to the previous description, AC can dynamically update the AP group. After AC updates the AP group, the AP group may change. Changes in the AP group refer to changes in the number of AP groups and / or the APs included in the AP group in the wireless communication system. Figure 4 is a second structural diagram of the wireless communication system provided in an embodiment of the present application. As shown in Figure 4. Based on Figure 1, AC updates the AP group. After updating the AP group, the second AP belongs to the first AP group, and the first AP and the third AP belong to the second AP group. After AC 101 updates the AP group, since the source AP and the target AP belong to the same AP group, AC requires the source AP to control the wireless signal of the STA. Figure 5 is a third structural diagram of the wireless communication method provided in an embodiment of the present application. As shown in Figure 5, the wireless communication method includes the following steps.

[0082] In step 501, the AC sends an intra-group control instruction to the first AP.

[0083] The AC sends a group control instruction to other APs in the AP group where the target AP is located. The group control instruction includes the identifier of the STA. In this embodiment of the present application, the other APs include the first AP as an example for description.

[0084] In step 502, the first AP does not respond to the wireless signal of the STA according to the intra-group control instruction.

[0085] Similar to the description of step 203 in the aforementioned Figure 2, the other APs in the AP group where the target AP is located do not reply to the STA's wireless signal according to the intra-group control instruction. The source AP does not reply to the STA's wireless signal according to the intra-group control instruction means that the source AP controls the STA's wireless signal according to the intra-group control instruction. For example, the source AP converts the first communication link into a virtual link, and the source AP controls the STA's wireless signal by establishing a virtual user. For another example, the source AP controls the STA's wireless signal according to the MAC address of the STA. For APs other than the source AP and the destination AP in the second AP group, the intra-group control instruction sent to them by AC 101 can also include relevant information of the STA. APs other than the source AP and the destination AP in the second AP group do not reply to the STA's wireless signal according to the relevant information of the STA.

[0086] In step 503, the AC sends a second control instruction to the second AP.

[0087] The AC sends a second control instruction to the AP of the other AP group. The second control instruction includes the identifier of the STA. In the embodiment of the present application, the description is made by taking the AP of the other AP group including the second AP as an example.

[0088] In step 504, the second AP deletes the relevant signal of the STA according to the second control instruction.

[0089] For the description of step 504 , reference can be made to the description of step 304 in FIG. 3 .

[0090] In practical applications, a wireless communication system may include other APs in addition to the first, second, and third APs. For example, based on Figure 4 , the wireless communication system also includes a fourth AP. The fourth AP belongs to the second AP group. Regarding AC 101's assignment of the fourth AP to the second AP group, reference can be made to the aforementioned method for AC 101 to assign AP groups. For example, when the third AP establishes a third communication link with a STA, AC 101 obtains a fourth signal strength between the STA and the fourth AP. If the fourth signal strength is greater than a threshold, AC 101 determines that the fourth AP belongs to the second AP group. If the fourth signal strength is less than or equal to the threshold, AC 101 determines that the fourth AP belongs to the first AP group. For another example, if the fourth AP and the third AP use the same wireless communication frequency, AC 101 determines that the fourth AP belongs to the second AP group. If the fourth AP and the third AP use different wireless communication frequencies, but the fourth AP and the first AP use the same wireless communication frequency, AC 101 determines that the fourth AP belongs to the first AP group. Figure 6 is a third schematic structural diagram of a wireless communication system provided in an embodiment of the present application. As shown in Figure 6 , based on Figure 4 , the second AP group also includes a fourth AP. The wireless communication method provided by the embodiment of the present application is described below using the wireless communication system in Figure 6 as an example. Figure 7 is a fourth structural diagram of the wireless communication method provided by the embodiment of the present application. As shown in Figure 7, the wireless communication method includes the following steps.

[0091] In step 701, the AC sends an intra-group control instruction to the fourth AP.

[0092] The AC sends a group control instruction to the other APs in the AP group where the target AP is located. The group control instruction includes relevant information of the STA. In this embodiment of the application, the other APs include the fourth AP as an example for description.

[0093] In step 702, the fourth AP does not respond to the wireless signal of the STA according to the intra-group control instruction.

[0094] For the description of step 702 , reference can be made to the description of step 502 in FIG. 5 .

[0095] In step 703, the AC sends a fourth control instruction to the fourth AP.

[0096] AC 101 determines whether the STA needs to communicate with the fourth AP. After AC 101 determines that the STA needs to communicate with the fourth AP, AC 101 sends a fourth control instruction to the fourth AP. After AC 101 determines that the STA does not need to communicate with the fourth AP, AC 101 does not send the fourth control instruction to the fourth AP. For a description of AC 101 determining whether the STA needs to communicate with the fourth AP, refer to the description of AC determining whether the STA needs to communicate with the third AP in FIG. 2 . The fourth control instruction includes the STA's identifier.

[0097] In step 704, the fourth AP associates with the STA according to the fourth control instruction.

[0098] After the fourth AP obtains the fourth control instruction from AC 101, the fourth AP establishes a fourth communication link with the STA through the fourth control instruction, that is, the fourth AP is associated with the STA. In the aforementioned step 702, the fourth AP does not reply to the wireless signal of the STA based on the relevant information of the STA. The relevant information of the STA can be the MAC address of the STA or the connection information of the STA. When the relevant information of the STA is the connection information of the STA, the fourth AP controls the wireless signal of the STA by creating a virtual user, that is, the fourth AP does not reply to the wireless signal of the STA. After receiving the fourth control instruction, the fourth AP can convert the virtual user corresponding to the STA into a non-virtual user, that is, convert the virtual link corresponding to the STA into a non-virtual link. After the fourth AP receives the wireless signal of the STA, the fourth AP replies to the wireless signal of the STA. When the relevant information of the STA is the MAC address of the STA, the fourth AP establishes a fourth communication link with the STA based on the connection information of the STA.

[0099] The fourth AP and the third AP have the same BSSID. The STA can roam from the third AP to the fourth AP without noticing. After roaming to the fourth AP, the STA connects to the network through the fourth AP. That is, the STA transmits uplink signals through the fourth AP and receives downlink signals from the fourth AP. Before and after the STA roams, the wireless signals sent by the STA use the same BSSID as the destination address. That is, the third wireless signal sent by the STA to the third AP and the third wireless signal sent by the STA to the fourth AP have the same BSSID.

[0100] In step 705, the AC sends a third control instruction to the third AP.

[0101] In step 706, the third AP does not respond to the wireless signal of the STA according to the third control instruction.

[0102] For the description of step 706 , reference can be made to the description of step 502 in FIG. 5 .

[0103] In the example of Figure 7 , before and after the STA roams from the third AP to the fourth AP, the third AP and the fourth AP belong to the same AP group. In this case, the STA roams from one AP to another AP through intra-group roaming. In this case, the fourth control instruction is also called an intra-group roaming instruction. In the example of Figure 2 , before and after the STA roams from the first AP to the third AP, the third AP and the first AP belong to different AP groups. In this case, the STA roams from one AP to another AP through cross-group roaming. In the example of Figure 1 , the first AP and the second AP belong to the same AP group. Therefore, in actual applications, the STA can also roam from the first AP to the second AP through intra-group roaming. The description of the STA roaming from the first AP to the second AP is similar to the description of the STA roaming from the third AP to the fourth AP. Therefore, the description of the STA roaming from the first AP to the second AP can refer to the description of the STA roaming from the third AP to the fourth AP.

[0104] As shown in Figure 3, in addition to the AP group containing the target AP, other AP groups can manage the STA's wireless signals based on whether they include redundant resources. Therefore, in the examples of Figures 2, 3, or 5, before the STA roams from the first AP to the third AP, the second AP group can also manage the STA's wireless signals based on whether it includes redundant resources. When the second AP group includes redundant resources, the APs in the second AP group manage the STA's wireless signals. When the second AP group does not include redundant resources, the APs in the second AP group do not manage the STA's wireless signals. After the AC determines that the STA needs to communicate with the third AP, if the number of STAs managed by the second AP group is greater than or equal to a threshold, the APs in the second AP group are also configured to delete the relevant information of the other STA, thereby releasing the management of the other STA's wireless signals. Before deleting the relevant information of the other STA, the APs in the second AP group do not respond to the other STA's wireless signals. To avoid communication confusion, the other STA becomes a managed user or virtual user of all APs in the second AP group.

[0105] The wireless communication system and wireless communication method provided in the embodiment of the present application are described above. The AC provided in the embodiment of the present application is described below. Figure 8 is a first structural diagram of the AC provided in the embodiment of the present application. As shown in Figure 8, AC 101 includes a first sending unit 801 and a second sending unit 802. The first sending unit 801 is used to send a second control instruction to the second AP among multiple APs, and the second control instruction includes relevant information of the STA. The multiple APs include a first AP, a second AP, and a third AP. A first communication link is established between the first AP and the STA. The second control instruction is used for the second AP to not reply to the wireless signal of the STA according to the second control instruction. After determining that the STA needs to communicate with the third AP. The second sending unit 802 is used to send the connection information of the STA to the third AP. The connection information of the STA is used for the third AP to establish a third communication link with the STA based on the connection information of the STA.

[0106] It should be understood that the description of AC 101 in Figure 8 is similar to the description of the wireless communication method in any of the aforementioned Figures 2, 3, 5, or 7. Therefore, the description of AC 101 in Figure 8 can refer to the description of the wireless communication method in any of the aforementioned Figures 2, 3, 5, or 7. For example, the first sending unit is further used to send a first control instruction to the first AP, the first control instruction including the identifier of the STA, and the first control instruction is used for the first AP to disconnect the first communication link according to the first control instruction. For another example, the multiple APs include a first AP group and a second AP group. The first AP group includes the first AP and the second AP, and the second AP group includes the third AP. The wireless communication frequencies of the first AP group and the second AP group are different. The wireless communication frequencies of the APs in the same AP group are the same.

[0107] Figure 9 is a second structural diagram of the AC provided in an embodiment of the present application. As shown in Figure 9, AC 101 includes a transceiver 901 and a processor 902. Transceiver 901 is a wireless radio frequency device. Processor 902 can be a central processing unit (CPU), a network processor (NP), a graphics processor, or a combination of a CPU and an NP. Processor 902 can further include a hardware chip or other general-purpose processor. The above-mentioned hardware chip can be an application specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. Processor 902 is used to obtain the connection information of the STA and control the transceiver 901 to send a second control instruction to the second AP among the multiple APs. The second control instruction includes relevant information of the STA. The multiple APs include a first AP, a second AP and a third AP. The first AP and the STA establish a first communication link. The second control instruction is used for the second AP to not reply to the wireless signal of the STA according to the second control instruction. After determining that the STA needs to communicate with the third AP, the processor 902 is further used to control the transceiver 901 to send the STA's connection information to the third AP. The STA's connection information is used by the third AP to establish a third communication link with the STA according to the STA's connection information.

[0108] It should be understood that the description of AC 101 in Figure 9 is similar to the description of the wireless communication method in any of the aforementioned Figures 2, 3, 5, or 7. Therefore, the description of AC 101 in Figure 9 can refer to the description of the wireless communication method in any of the aforementioned Figures 2, 3, 5, or 7. For example, the processor 902 is further used to control the transceiver 901 to send a first control instruction to the first AP, the first control instruction including the identifier of the STA, and the first control instruction is used for the first AP to disconnect the first communication link according to the first control instruction. For another example, the multiple APs include a first AP group and a second AP group. The first AP group includes the first AP and the second AP, and the second AP group includes the third AP. The wireless communication frequencies of the first AP group and the second AP group are different. The wireless communication frequencies of the APs in the same AP group are the same.

[0109] In other embodiments, AC 101 can also include memory. The memory can be volatile memory or non-volatile memory, or can include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), or flash memory. The volatile memory can be random access memory (RAM). The memory can be used to store STA connection information.

[0110] The above is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed in this application, which should be covered by the protection scope of the present application.

Claims

1. A wireless communication system, characterized in that: Includes multiple access points (APs), including: The multiple APs include a first AP, a second AP, and a third AP, the multiple APs include a same basic service set identifier (BSSID), and a first communication link is established between the first AP and a station (STA); An access controller (AC) managing the multiple APs is used to send a second control instruction to the second AP, where the second control instruction includes relevant information of the STA; The second AP is used for not replying to the wireless signal of the STA according to the second control instruction; After determining that the STA needs to communicate with the third AP, the AC is further used to send connection information of the STA to the third AP; The third AP is used to establish a third communication link with the STA according to the connection information of the STA.

2. The wireless communication system according to claim 1, characterized in that: The first communication link and the third communication link have the same frequency; The AC is further used to send a first control instruction to the first AP, where the first control instruction includes an identifier of the STA; The first AP is used to disconnect the first communication link according to the first management and control instruction.

3. The wireless communication system according to claim 2, characterized in that: The first AP is further configured to not reply to the wireless signal of the STA according to the first control instruction.

4. The wireless communication system according to any one of claims 1 to 3, characterized in that: The wireless communication frequencies of the first AP and the second AP are the same, and the wireless communication frequencies of the first AP and the third AP are different.

5. The wireless communication system according to any one of claims 1 to 4, characterized in that: Before the third AP and the STA establish a third communication link, the third AP is also used to delete relevant information of another STA. Before deleting the relevant information of the other STA, the third AP does not reply to the wireless signal from the other STA.

6. The wireless communication system according to any one of claims 1 to 5, characterized in that: The plurality of APs further includes a fourth AP; After the third AP establishes a third communication link with the STA, if the signal strength between the STA and the fourth AP is greater than a threshold, the AC is further configured to send a fourth control instruction to the fourth AP, where the fourth control instruction includes relevant information of the STA; The fourth AP is used to not reply to the wireless signal of the STA according to the fourth control instruction.

7. The wireless communication system according to any one of claims 1 to 5, characterized in that: After the third AP establishes a third communication link with the STA, if the number of STAs controlled by the fourth AP is less than a threshold, the AC is further configured to send a fourth control instruction to the fourth AP, where the fourth control instruction includes relevant information of the STA; The fourth AP is used to not reply to the wireless signal of the STA according to the fourth control instruction.

8. The wireless communication system according to claim 6 or 7, characterized in that: The relevant information of the STA is a medium access control (MAC) address of the STA; The AC is further configured to send an intra-group roaming instruction to the fourth AP, where the intra-group roaming instruction includes connection information of the STA; The fourth AP is further used to establish a fourth communication link with the STA according to the connection information of the STA; The AC is further configured to send a third control instruction to the third AP, where the third control instruction includes an identifier of the STA; The third AP is also used to disconnect the third communication link according to the third control instruction and not reply to the wireless signal of the STA.

9. The wireless communication system according to claim 6 or 7, characterized in that: The relevant information of the STA is the connection information of the STA; The AC is further configured to send an intra-group roaming instruction to the fourth AP, where the intra-group roaming instruction includes an identifier of the STA; The fourth AP is further used to reply the wireless signal of the STA according to the intra-group roaming instruction; The AC is further configured to send a third control instruction to the third AP, where the third control instruction includes an identifier of the STA; The third AP is also used to disconnect the third communication link according to the third control instruction and not reply to the wireless signal of the STA.

10. A wireless communication method, characterized in that: include: An access controller (AC) sends a second control instruction to a second access point (AP) among multiple access points (APs), wherein the second control instruction includes relevant information of a station (STA), the multiple APs include a first AP, the second AP, and a third AP, a first communication link is established between the first AP and the STA, and the second control instruction is used to instruct the second AP not to reply to a wireless signal of the STA; After determining that the STA needs to communicate with the third AP, the AC sends the connection information of the STA to the third AP, and the connection information of the STA is used by the third AP to establish a third communication link with the STA according to the connection information of the STA.

11. The wireless communication method according to claim 10, characterized in that: The method further comprises: The AC sends a first control instruction to the first AP, where the first control instruction includes an identifier of the STA, and the first control instruction is used to instruct the first AP to disconnect the first communication link.

12. The wireless communication method according to claim 11, characterized in that: The first control instruction is used to instruct the first AP not to reply to the wireless signal of the STA.

13. The wireless communication method according to any one of claims 10 to 12, characterized in that: The wireless communication frequencies of the first AP and the second AP are the same, and the wireless communication frequencies of the first AP and the third AP are different.

14. The wireless communication method according to any one of claims 10 to 13, characterized in that: The plurality of APs further include a fourth AP, and the method further includes: After the third AP establishes a third communication link with the STA, if the signal strength between the STA and the fourth AP is greater than a threshold, the AC sends a fourth control instruction to the fourth AP, the fourth control instruction including relevant information of the STA, and the fourth control instruction is used to instruct the fourth AP not to reply to the wireless signal of the STA.

15. The wireless communication method according to any one of claims 10 to 13, characterized in that: The method further comprises: After the third AP establishes a third communication link with the STA, if the number of STAs controlled by the fourth AP is less than a threshold, the AC is also used to send a fourth control instruction to the fourth AP, wherein the fourth control instruction includes relevant information of the STA, and the fourth control instruction is used to instruct the fourth AP not to reply to the wireless signal of the STA.

16. The wireless communication method according to claim 14 or 15, characterized in that: The relevant information of the STA is a media access control (MAC) address of the STA, and the method further includes: The AC sends an intra-group roaming instruction to the fourth AP, where the intra-group roaming instruction includes the connection information of the STA, and the intra-group roaming instruction is used to instruct the fourth AP to establish a fourth communication link with the STA according to the connection information of the STA; The AC also sends a third control instruction to the third AP, where the third control instruction includes the identifier of the STA, and the third control instruction is used to instruct the third AP to disconnect the third communication link and not reply to the wireless signal of the STA.

17. The wireless communication method according to claim 14 or 15, characterized in that: The relevant information of the STA is connection information of the STA, and the method further includes: The AC sends an intra-group roaming instruction to the fourth AP, where the intra-group roaming instruction includes an identifier of the STA, and the intra-group roaming instruction is used to instruct the fourth AP to reply to a wireless signal of the STA; The AC also sends a third control instruction to the third AP, where the third control instruction includes the identifier of the STA, and the third control instruction is used to instruct the third AP to disconnect the third communication link and not reply to the wireless signal of the STA.

18. An access controller AC, characterized in that: The method comprises a processor and a transceiver, wherein the processor is used to obtain connection information of a STA and control the transceiver to execute the method described in any one of claims 10 to 17.

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