Abstract: A wireless local area network channel management method in rail transport and a related device, where the method includes changing, by a first trackside access point, an operating channel of the first trackside access point to a second channel when a wireless communication link has been established between the first trackside access point and an in-vehicle access point, and a first channel and the second channel are different, where the first channel is an operating channel of the first trackside access point before the operating channel of the first trackside access point is changed, and the second channel is an operating channel of a second trackside access point, and instructing, by the first trackside access point, the in-vehicle access point to change an operating channel of the in-vehicle access point to the second channel.

Abstract: According to a method for handover between distributed access points, an AP 1 receives a handover request sent by a central AP, where the handover request includes an address of a wireless terminal and an identifier of an AP 2; and after receiving the handover request, the AP 1 sends a context handover request to the AP 2, where the context handover request includes an unsent frame of the wireless terminal. In a handover process, the AP 1 may send, to the AP 2, a buffered frame that fails to be sent to the wireless terminal in time, and send the frame to the wireless terminal by using the AP 2, so as to reduce a downlink packet loss when the wireless terminal is handed over between the AP 1 and the AP 2.

Abstract: A method, an apparatus, and a system for enhancing a concurrent processing capability of a wireless local area network (WLAN) are disclosed. The method includes receiving a first association request including an identifier of a first station (STA) that is from the first STA; performing association with the first STA; sending a first association query request including the identifier of the first STA to a WLAN controller; after the first STA is associated, receiving an association query response from the WLAN controller; and performing disassociation from the first STA when the association query response is used to instruct an access point (AP) not to associate with the first STA. When a large quantity of association events need to be concurrently processed, a STA is associated with at first, improving user experience.

Abstract: A method for a handover between distributed access points is disclosed, including receiving, by a central AP, an Ethernet frame; adding, by the central AP, a sequence number to the frame according to an address of a wireless terminal; sending, by the central AP to an AP 1, the frame to which the sequence number is added, and storing the frame to which the sequence number is added in a historical frame set of the wireless terminal; and sending, by the central AP, a frame in the historical frame set of the wireless terminal to an AP 2 when the wireless terminal is handed over from the AP 1 to the AP 2. If the wireless terminal moves fast, the central AP can send the frame in the historical frame set to the wireless terminal using the AP 2, so that a downlink packet loss is reduced.

Abstract: A wireless local area network channel management method in rail transport and a related device, where the method includes changing, by a first trackside access point, an operating channel of the first trackside access point to a second channel when a wireless communication link has been established between the first trackside access point and an in-vehicle access point, and a first channel and the second channel are different, where the first channel is an operating channel of the first trackside access point before the operating channel of the first trackside access point is changed, and the second channel is an operating channel of a second trackside access point, and instructing, by the first trackside access point, the in-vehicle access point to change an operating channel of the in-vehicle access point to the second channel.

Abstract: A method for handover between distributed access points (APs), where the method includes a central AP sending a first instruction to an AP 2. The first instruction includes an identifier of the wireless terminal, and the first instruction is used to instruct the AP 2 to start receiving a data frame from the wireless terminal, and forbid the AP 2 to return an acknowledgement frame to the wireless terminal. The central AP sends a handover success notification message to an AP 1 and the AP 2. The handover success notification message includes the identifier of the wireless terminal, and the handover success notification message is used to instruct the AP 1 to stop receiving the data frame from the wireless terminal, and is used to instruct the AP 2 to return the acknowledgement frame to the wireless terminal.

Abstract: A method, an apparatus, and a system for enhancing a concurrent processing capability of a wireless local area network (WLAN) are disclosed. The method includes receiving a first association request including an identifier of a first station (STA) that is from the first STA; performing association with the first STA; sending a first association query request including the identifier of the first STA to a WLAN controller; after the first STA is associated, receiving an association query response from the WLAN controller; and performing disassociation from the first STA when the association query response is used to instruct an access point (AP) not to associate with the first STA. When a large quantity of association events need to be concurrently processed, a STA is associated with at first, improving user experience.

Abstract: According to a method for handover between distributed access points, an AP 1 receives a handover request sent by a central AP, where the handover request includes an address of a wireless terminal and an identifier of an AP 2; and after receiving the handover request, the AP 1 sends a context handover request to the AP 2, where the context handover request includes an unsent frame of the wireless terminal. In a handover process, the AP 1 may send, to the AP 2, a buffered frame that fails to be sent to the wireless terminal in time, and send the frame to the wireless terminal by using the AP 2, so as to reduce a downlink packet loss when the wireless terminal is handed over between the AP 1 and the AP 2.

Abstract: A method for a handover between distributed access points is disclosed, including receiving, by a central AP, an Ethernet frame; adding, by the central AP, a sequence number to the frame according to an address of a wireless terminal; sending, by the central AP to an AP 1, the frame to which the sequence number is added, and storing the frame to which the sequence number is added in a historical frame set of the wireless terminal; and sending, by the central AP, a frame in the historical frame set of the wireless terminal to an AP 2 when the wireless terminal is handed over from the AP 1 to the AP 2. If the wireless terminal moves fast, the central AP can send the frame in the historical frame set to the wireless terminal using the AP 2, so that a downlink packet loss is reduced.

Abstract: A method for handover between distributed access points (APs), where the method includes a central AP sending a first instruction to an AP 2. The first instruction includes an identifier of the wireless terminal, and the first instruction is used to instruct the AP 2 to start receiving a data frame from the wireless terminal, and forbid the AP 2 to return an acknowledgement frame to the wireless terminal. The central AP sends a handover success notification message to an AP 1 and the AP 2. The handover success notification message includes the identifier of the wireless terminal, and the handover success notification message is used to instruct the AP 1 to stop receiving the data frame from the wireless terminal, and is used to instruct the AP 2 to return the acknowledgement frame to the wireless terminal.

Abstract: The present disclosure provide a method for creating a stream forwarding entry includes: receiving, by a data communication device, a packet; making statistics on the received packet to obtain a statistical value of a stream corresponding to the packet; judging whether the statistical value of the stream exceeds a preset threshold value; and if exceeds the preset threshold value, creating, by the data communication device, a stream forwarding entry for the stream corresponding to the packet, and performing stream forwarding for subsequent packets of the stream according to the stream forwarding entry. Through the present disclosure, the number of stream forwarding entries in a stream table is reduced, the required storage space is reduced, and the maintenance of the stream table is simplified; moreover, the data communication device is not vulnerable to attacks of denial of service and is highly secure.

Abstract: A routing optimization method includes: establishing a routing optimization proxy binding relationship between a proxy mobile agent (PMA) of a mobile node and a PMA of a correspondent node; controlling, by the PMA of the mobile node, according to the established routing optimization proxy binding relationship, routing of a message to be transmitted. And a message transmission system based on a PMA is also provided, which includes: a proxy binding control unit, configured to establish a routing optimization proxy binding relationship with a PMA of a correspondent node; and a routing control unit, configured to control routing of a message to be transmitted based on the established routing optimization proxy binding relationship. With the present invention, it may raise the communication efficiency for various nodes in the proxy mobile IP architecture and improve the routing performance.

Abstract: A routing optimization method includes: establishing a routing optimization proxy binding relationship between a proxy mobile agent (PMA) of a mobile node and a PMA of a correspondent node; controlling, by the PMA of the mobile node, according to the established routing optimization proxy binding relationship, routing of a message to be transmitted. And a message transmission system based on a PMA is also provided, which includes: a proxy binding control unit, configured to establish a routing optimization proxy binding relationship with a PMA of a correspondent node; and a routing control unit, configured to control routing of a message to be transmitted based on the established routing optimization proxy binding relationship. With the present invention, it may raise the communication efficiency for various nodes in the proxy mobile IP architecture and improve the routing performance.