Abstract: An ultrasonic-stirring narrow gap welding system and a welding method, and the ultrasonic-stirring narrow gap welding system includes a welding machine power source, a wire feeder, a narrow gap welding torch, and an ultrasonic stirring subsystem. A welding wire is fed into a narrow gap through the narrow gap welding torch provided above a groove, to generate an arc for welding. The ultrasonic stirring subsystem includes a stirrer and an ultrasonic device, a stirring rod is connected to the ultrasonic device and inserted into a molten pool to form a preset angle relative to the welding wire for stirring, and an ultrasonic-stirring narrow gap welding mode is realized.

Abstract: According to an example, an AP may obtain an influence index for each of antenna combinations, and determine antenna combinations whose influence indices are smaller than or equal to a pre-determined threshold to be valid antenna combinations. The antenna combinations may include antennas not more than the maximum number of transmitting links supported by the AP. Each influence index may indicate the influence of an antenna combination on default antenna combinations of neighboring APs operating on the same channel. The AP may adjust the available transmission rates supported by the AP according to the largest number of antennas in the valid antenna combinations. The AP may select a transmission rate from the range for a frame, determine the number of antennas corresponding to the selected transmission rate, and select an antenna combination in which the number of antennas equals the determined number of antennas from the valid antenna combinations for transmitting the frame.

Abstract: According to an example, an AP may obtain an influence index for each of antenna combinations, and determine antenna combinations whose influence indices are smaller than or equal to a pre-determined threshold to be valid antenna combinations. The antenna combinations may include antennas not more than the maximum number of transmitting links supported by the AP. Each influence index may indicate the influence of an antenna combination on default antenna combinations of neighboring APs operating on the same channel. The AP may adjust the available transmission rates supported by the AP according to the largest number of antennas in the valid antenna combinations. The AP may select a transmission rate from the range for a frame, determine the number of antennas corresponding to the selected transmission rate, and select an antenna combination in which the number of antennas equals the determined number of antennas from the valid antenna combinations for transmitting the frame.

Abstract: The present disclosure describes promoting roaming of a wireless terminal in a wireless local area network (WLAN). The AP obtains signal quality and/or data transmission quality of the wireless terminal periodically, and determines whether the obtained signal quality and/or data transmission quality of the wireless terminal satisfies a predetermined threshold. Upon determining that the predetermined threshold is not satisfied, the AP proactively sends a probe response frame to the wireless terminal. The probe response frame notifies the wireless terminal of a wireless signal strength of the AP to promote roaming to a neighboring AP.

Abstract: A method of establishing network connection between a network device and a WLAN is disclosed. The method includes: determining whether there is previous security association between the network device and the WLAN at the time of requesting for network association, and establishing a new security association between the network device and the WLAN using security data generated in the course of establishing the previous security association if there is the previous security association.

Abstract: According to an example, a network device serving as a monitoring device for a zero-configuration network protocol is in a subnet in a network including multiple subnets. The monitoring device may receive and update a service in another subnet that is notified by a manager. Also, the monitoring device may respond to a query for the service from a terminal in the subnet when the queried service is in another subnet.

Abstract: A mobile mesh point is mobile with respect to a first connecting mesh point and a second connecting mesh point. While the mobile mesh point has a mesh link with the first connecting mesh point, the mobile mesh point scans for a connecting mesh point with which it may establish a mesh link. On detecting the second connecting mesh point, the mobile mesh point may establish a virtual mesh link between the mobile mesh point and the second connecting mesh point by exchanging messages between the mobile mesh point and the second connecting mesh point via the first connecting mesh point. The messages exchanged comprise messages to establish a real mesh link. The virtual mesh link may be transformed to a real mesh link between the mobile mesh point and the second connecting mesh point.

Abstract: According to an example, a detecting AP may determine whether a rogue AP is in the wireless network. In response to a determination that a rogue AP is in the wireless network, the detecting AP may obtain a wireless channel of the rogue AP and according to the wireless channel of the rogue AP, the detecting AP may transmit on the wireless channel of the rogue AP, a channel switch instruction to a client associated with the rogue AP by simulating an identity of the rogue AP. The channel switch instruction is to instruct the client to switch to a designated new channel.

Abstract: A method of establishing network connection between a network device and a WLAN is disclosed. The method includes: determining whether there is previous security association between the network device and the WLAN at the time of requesting for network association, and establishing a new security association between the client device and the WLAN using security data generated in the course of establishing said previous security association if there is said previous security association.

Abstract: The present disclosure describes promoting roaming of a wireless terminal in a wireless local area network (WLAN). The AP obtains signal quality and/or data transmission quality of the wireless terminal periodically, and determines whether the obtained signal quality and/or data transmission quality of the wireless terminal satisfies a predetermined threshold. Upon determining that the predetermined threshold is not satisfied, the AP proactively sends a probe response frame to the wireless terminal. The probe response frame notifies the wireless terminal of a wireless signal strength of the AP to promote roaming to a neighbouring AP.

Abstract: A microcell wireless network includes at least one access controller (AC) and multiple physical APs in wireless communication with mobile stations. The AC configures an independent virtual AP for each mobile station in the microcell wireless network on a first physical AP associated with the mobile station. When migration of a virtual AP configured for a mobile station is required, the AC transferring the virtual AP from the first physical AP to a second physical AP according to a predetermined policy.

Abstract: A method for implementing neighbor discovery protocol in a wireless local area network (WLAN) and an access point (AP). In the method, the AP prestores the logic group of each wireless client associated to the AP, determines the logic group of a neighbor discovery protocol related message when the message is received by the AP, and transmits the neighbor discovery protocol related message to at least one wireless client included in the logic group of the message via a unicast mode, respectively, according to prestored information relating to the logic group of each wireless client associated to the AP.