Abstract:
Embodiments of this application disclose a channel access method and apparatus. The method includes: A first device determines a first frame, where the first frame includes first indication information, the first indication information indicates a first AP in at least one access point AP to perform contention access for a first traffic in a first slot, and the first traffic includes a traffic for which channel access is performed by using a priority interframe space PIFS; and the first device sends the first frame to the first AP. According to embodiments of this application, contention and a collision with another AP in a channel access process are avoided, to improve quality of service of a traffic.
Abstract:
This application relates to the field of wireless fidelity Wi-Fi technologies, and in particular, to a groupcast feedback method, an apparatus, and a system, to send a feedback in a groupcast transmission scenario. According to the method, an access point sends a groupcast data frame and a groupcast feedback trigger frame. The groupcast feedback trigger frame is used to schedule a plurality of stations in a groupcast group to indicate whether the groupcast data frame is correctly decoded.
Abstract:
A communications device includes: a processor, configured to determine a quantity of first idle channels; and a transmitter, configured to send data to a receiving end on each of the first idle channels; wherein the processor is further configured to: determine whether the data is to be resent; and if the data is to be resent, cause the transmitter to resend the data; and continue to determine whether the data is to be resent and, if the data is to be resent, re-determine the quantity of first idle channels and cause the transmitter to resend the data
Abstract:
Embodiments of the present invention provide a method and an apparatus for establishing a transmission mode, which relates to the field of network technologies, ensure backward compatibilities of an existing WLAN system and a next generation WLAN system, realize introduction of a new technology in the next generation WLAN protocol during data transmission, and improve network performance. The method includes: transmitting, by an access point AP, a first Clear To Send frame to a first station STA, to enable the first STA to set duration of a network allocation vector NAV of the first STA and remain in a silent state when the AP communicates with a second STA; transmitting the first Clear To Send frame to the second STA, to enable the second STA to process a Green Phase operation; and communicating with the second STA in a Green Phase period. The present invention is applied in data transmission.
Abstract:
The present invention discloses a communication method and system using MIMO technology. The communication method includes: a network side device determines whether a UE uses a single-stream mode or a multi-stream mode as an uplink data transmission mode; and the network side device notifies the UE of indication information indicating the determined uplink data transmission mode. The communication method and system help the UE to use a specific uplink data transmission mode in combination with various factors, therefore reducing a delay of an uplink data transmission, improving an uplink data transmission speed, thereby meeting development needs of uplink high-speed data communication services of the UE.
Abstract:
The present disclosure relates to optical fiber plugs, optical fiber adapters, and optical fiber connector assemblies. One example optical fiber plug includes a ferrule, a sleeve, and a lock cap. At least one lock block is disposed on an inner wall of the lock cap. The at least one lock block is configured to be engaged and locked with a lock slot on an optical fiber adapter. Two stop blocks are disposed on the inner wall of the lock cap. A stop rod is disposed on an outer wall of the sleeve. The stop rod is located between the two stop blocks. The lock cap rotates relative to the sleeve within an angle range limited by the two stop blocks.
Abstract:
This application discloses channel sounding methods and communication apparatuses. One method includes: receiving, by a second access point, a user association frame from a first access point, wherein the user association frame carries identification information of a first station and is used to determine a first channel sounding result of the first station associated with the first access point, and determining, by the second access point, the first channel sounding result from a plurality of second channel sounding results based on the user association frame, wherein the plurality of second channel sounding results are obtained by the second access point by performing sounding on a plurality of channel sounding frames from a plurality of stations.
Abstract:
This application discloses a channel estimation method and apparatus, a communications system, pertains to the field of communications technologies. The method is applied to an AP, includes: obtaining communication quality between the AP and a STA; determining, based on the communication quality, a quantity of channel estimations that need to be performed in a current round of TSCE; and obtaining channel state information CSI between the AP and the STA, where the CSI is determined based on a channel estimation result obtained after the current round of TSCE is performed based on the determined quantity of channel estimations. In this application, the AP adjusts, in real time based on the communication quality, a quantity of channel estimations that need to be performed in each round of TSCE, to resolve a problem of relatively low reliability of channel estimation in a related technology.
Abstract:
Embodiments of the present invention disclose a method for controlling power of an uplink multiple-input multiple-output channel, and a user equipment that are used to support an uplink MIMO application scenario and implement control of transmit power of a UE. The method in the embodiments of the present invention includes: when total transmit power of a user equipment UE is greater than maximum allowed transmit power, performing, by the UE, power reduction for an uplink multiple-input multiple-output MIMO channel on which a main data transmission block and a secondary data transmission block are sent, so that the total transmit power of the UE after the reduction is less than or equal to the maximum allowed transmit power.
Abstract:
This application provides a data transmission method and apparatus. The method includes: A first access point detects a channel. If the first access point detects an idle first channel, the first access point sends a first trigger frame to at least one second access point, where the first trigger frame is used to trigger the at least one second access point to send data on the first channel after a first preset time period elapses. In this way, an existing CSMA channel detection mechanism may be compatible with the method, and a conflict caused by contention of a plurality of APs for a channel at the same time can be avoided, which helps improve network transmission efficiency, and helps improve transmission performance.