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14. What is WMM?

Wi-Fi Multimedia (WMM), a group of features for wireless networks that

improve the user experience for audio, video and voice applications. WMM is

based on a subset of the IEEE 802.11e WLAN QoS draft standard. WMM adds

prioritized capabilities to Wi-Fi networks and optimizes their performance

when multiple concurring applications, each with different latency and

throughput requirements, compete for network resources. By using WMM,

end-user satisfaction is maintained in a wider variety of environments and

traffic conditions. WMM makes it possible for home network users and

enterprise network managers to decide which data streams are most

important and assign them a higher traffic priority.

15. What is WMM Power Save?

WMM Power Save is a set of features for Wi-Fi networks that increase the

efficiency and flexibility of data transmission in order to conserve power. WMM

Power Save has been optimized for mobile devices running latency-sensitive

applications such as voice, audio, or video, but can benefit any Wi-Fi device.

WMM Power Save uses mechanisms included in the IEEE 802.11e standard

and is an enhancement of IEEE 802.11 legacy power save. With WMM Power

Save, the same amount of data can be transmitted in a shorter time while

allowing the Wi-Fi device to remain longer in a low-power “dozing” state.

16. What is GI?

GI stands for Guard Interval. It’s a measure to protect wireless devices from

cross- interference. If there are two wireless devices using the same or near

channel, and they are close enough, radio interference will occur and reduce

the radio resource usability.

17. What is STBC?

STBC stands for Space-Time Block Coding, which is a technique used to

transfer multiple copies of data by multiple antenna, to improve data transfer

performance. By using multiple antennas, not only data transfer rate is

improved, but also the wireless stability.

18. What is WPS?

WPS stands for Wi-Fi Protected Setup. It provides a simple way to establish

unencrypted or encrypted connections between wireless clients and access

point automatically. User can press a software or hardware button to activate

WPS function, and WPS-compatible wireless clients and access point will

establish connection by themselves. There are two types of WPS: PBC

(Push-Button Configuration) and PIN code.