Abstract: Transmission control methods and devices for avoiding data collision are provided. According to the methods, a first radio frame is generated by a first station. The first radio frame includes a physical layer preamble, a null instruction information domain and a data section. The null instruction information domain is used for triggering an access point in another basic service set. The basic service set receives the first radio frame to send a second radio frame. The second radio frame indicates a time for reserving a channel. According to the methods, the first radio frame is sent by the first station.

Abstract: A method and system for performing low power synchronization between to communication nodes is disclosed herein. In one embodiment, a method performed by a first wireless communication node includes: determining a wake up window start time and duration of a second wireless communication node; and transmitting at least one signal to the second wireless communication node during the determined wake up window, the at least one signal comprising at least one synchronization sequence, wherein the at least one synchronization sequence is configured to enable the second wireless communication node to adjust its wake up window timing.

Abstract: A method for radio frame transmission, applied to a communication station, is provided, the method including: receiving a request frame sent simultaneously or in a time-sharing manner by one or more stations; and sending a broadcast response frame to the one or more stations. Also provided is a device for radio frame transmission. The solutions of the present application can improve the transmission efficiency.

Abstract: Access to a wireless medium is controlled based on contention arbitration. A certain number of wireless devices are allowed by an access point to contend for a transmission opportunity. A trigger frame is used to communicate access opportunities to multiple devices. A beacon transmission may additionally be used for communication of access opportunities.

Abstract: A method for processing a network allocation vector (NAV) includes: terminating the receiving of a first radio frame when it is determined that a target receiving station of the first radio frame being received is not a first station; and updating an NAV of the first station or maintaining the NAV of the first station unchanged according to a remaining duration of the first radio frame and a first transmission opportunity duration carried in the first radio frame, where the remaining duration of the first radio frame is the transmission time used for transmitting the remaining part of the first radio frame after the receiving of the first radio frame is terminated. The technical solution solves the problem in the related art of collisions with hidden stations caused by an inaccurate NAV update in the existing art, thereby ensuring the accuracy of an NAV update and the fairness of transmission and channel contention, and reducing collisions among hidden stations.

Abstract: Disclosed are a method for establishing a direct connection link, and a method and a node for same realizing data transmission thereby. The establishment method comprises: establishing a direct connection link between a first node and a second node, determining a policy according to pre-set direct connection control information, and determining direct connection control information corresponding to the established direct connection link. The method disclosed herein realizes, by determining, for a direct connection link, specialized direct connection control information for identifying the direct connection link, optimization of the establishment and transmission process of the direct connection link, such that the direct connection link well distinguishes from a link of a basic network architecture, thus improving the network efficiency.

Abstract: Disclosed are a data transmission method, an access point and a station. The method comprises: sending a radio frame to a plurality of stations, triggering the stations to perform unlink multi-user transmission, and when the stations belong to different basic service sets of the access point, setting a sending address of the radio frame to be a common address.

Abstract: A wire connection terminal for a photovoltaic string is provided. The wire connection terminal includes: a terminal connector, a fuse and a printed circuit board (PCB). The terminal connector is connected to a positive electrode or a negative electrode of the photovoltaic string. The fuse is configured to prevent the photovoltaic string from outputting an excessive current. The PCB is configured to sample an output current and an output voltage of the photovoltaic string, communicate with an inverter, and control the photovoltaic string to disconnect from a direct current bus and output abnormal data for display when the output current and/or the output voltage of the photovoltaic string is abnormal or a system failure occurs.

Abstract: The present disclosure provides a method for channel detection, a sending terminal and a system comprising the sending terminal and a receiving terminal. The method for channel detection, including: when an Access Point (AP) allows an associated Station (STA) associated with it to use a dynamic channel detection threshold, sending, by the AP, one or more pieces of detection information used by the associated STA and a set of dynamic threshold parameters corresponding to the one or more pieces of detection information.

Abstract: The present disclosure relates to transmission control methods and devices for avoiding data collision. The method includes: generating, by a first station, a first radio frame which comprises a physical layer preamble, a null instruction information domain and a data section, wherein the null instruction information domain is used for triggering an access point in another basic service set which receives the first radio frame to send a second radio frame which indicates a time for reserving a channel; and sending, by the first station, the first radio frame.

Abstract: Access to a wireless medium is controlled based on contention arbitration. A certain number of wireless devices are allowed by an access point to contend for a transmission opportunity. A trigger frame is used to communicate access opportunities to multiple devices. A beacon transmission may additionally be used for communication of access opportunities.

Abstract: Provided in the present invention are a method and device for competitive transmission. The method comprises: an access point transmits a trigger frame or a radio frame carrying a trigger information domain to a non-access point to trigger the non-access point to perform uplink multiuser transmission; and, when data transmitted by the non-access point is received by the access point, same resets a competitive window of an access type to an initial value.

Abstract: The present disclosure provides a method for channel detection, a sending terminal and a system comprising the sending terminal and a receiving terminal. The method for channel detection, including: when an Access Point (AP) allows an associated Station (STA) associated with it to use a dynamic channel detection threshold, sending, by the AP, one or more pieces of detection information used by the associated STA and a set of dynamic threshold parameters corresponding to the one or more pieces of detection information.

Abstract: Provided are a channel detection method, terminal and system, the method comprising: when an access point allows a station associated therewith to use a dynamic channel detection threshold, the associated station collects detection information (101); according to the detection information, the associated station determines whether to use the dynamic channel detection threshold to conduct channel detection (102).

Abstract: Disclosed are a method and device for receiving the radio frame. The method comprises: a first functional entity of a station detects that a channel signal intensity reaches a preset threshold, and the first functional entity starts receiving a radio frame and sends an indication that a channel detection result is busy to a second functional entity of the station; the first functional entity determines that the station is not a target station for receiving the radio frame, and sends an indication of ending up receiving the radio frame to the second functional entity; and when transmission of the radio frame ends, the first functional entity sends an indication that the channel detection result is idle to the second functional entity. The disclosure provides a reception operation processing procedure of a station having the function of discarding the radio frame while not updating a network allocation vector (NAV).

Abstract: The present invention relates to a shaker capable of being used in a carbon dioxide incubator and a cell suspension culture method. The shaker comprises a power supply system, a driving device and an executing mechanism. The power supply system is connected with the driving device through a power line, of which the length can pass through the inside and the outside of the incubator through a joint position of an inner door of the incubator and a sealing gasket on a frame of an incubator door or through a through hole in the back of the incubator. The power line enables the driving device and the executing mechanism, and the power supply system to be arranged inside and the outside the incubator respectively, thereby solving problems of temperature-control failure of the incubator resulting from excessive accumulated heat produced by the power supply system and damage to electronic elements of the incubator caused by dampness in the incubator when a conventional shaker is used in the carbon dioxide incubator.

Abstract: Disclosed are a method and system for transmitting data in a wireless local access network. The method includes: a first station sending a radio frame to a second station in an obtained transmission opportunity, and carrying, in the radio frame, notification information indicating that the second station uses the transmission opportunity to communicate with a third station. The technical scheme provided in embodiments of the present invention are applicable to transmission opportunity management in a data relay process in the wireless local area network, to achieve the control right management of transmission opportunity under the control of the first station.

Abstract: A three-level photovoltaic inverter pulse width modulation method and a three-level photovoltaic inverter pulse width modulator. The method includes: when it is detected that potential safety hazards exist in a three-level photovoltaic inverter, switching the pulse width modulation mode of the three-level photovoltaic inverter into a 13-vector space vector pulse width modulation mode, to solve the fault or abnormal problems in the three-level photovoltaic inverter such as midpoint potential offset or excessively large common mode leakage current formed when the ground stray capacitance of a photovoltaic assembly is large, wherein according to the 13-vector SVPWM mode, 12 short vectors in 27 on-off state vectors of the three-level photovoltaic inverter are abandoned, and only six long vectors, six middle vectors and three zero vectors are reserved.

Abstract: At least some embodiments of the disclosure provide a data sending method, acquisition method, sending device and acquisition device. The data sending method includes that: a first Station (STA) encapsulates data required to be sent to a plurality of second STAs in different Protocol Data Units (PDUs) respectively, and PDUs comprise at least one of Media Access Control (MAC) PDUs (MPDUs) and Physical (PHY) PDUs (PPDUs); the first STA aggregates the PDUs encapsulated with the data in at least one radio frame; and the first STA sends the at least one radio frame to the plurality of second STAs.

Abstract: A method for transmitting data and a station are described. The method includes: when there is data to be sent in a station, determining whether there is a station using a channel in a BSS to which the station belongs and an OBSS using virtual channel detection; when determining that there is no station using the channel in the BSS to which the station belongs and there is a station using the channel in the OBSS, starting or resuming a back off procedure for OBSS spatial reuse transmission of the station; and monitoring the channel in the back off procedure for the OBSS spatial reuse transmission according to a fixed first channel detection threshold and a dynamically adjusted second channel detection threshold, transmitting data when the back off procedure for the OBSS spatial reuse transmission ends.