3Com 3CRWDR200B-75 Txop Transmission Opportunity WMM Wireless Multimedia, Edca AP Paramenters

58CHAPTER 5: ROUTER CONFIGURATION

Figure 36 WMM Screen

Typically, voice and video traffic types are delay-sensitive, but are tolerant of some frame losses.On the other hand, data traffic type is delay-tolerable, but requires loss-free transmission. So you may adjust theses parameters with regard to the characteristics of these types of data to better manage your network flow.

AC (Access Category): It uses 4 different ACs, from high to low:

VO:Voice, VI: Video, BE:Best Effort, BK: Background

AIFS (Arbitrary Interframe Space): An Interframe Space for different

Access Category

TXOP (Transmission Opportunity): WMM (Wireless Multimedia)

Transmission Opportunity: defined by IEEE 802.11e, the TXOP is the interval of time when a particular STA (station) has the right to initiate transmissions.

ACM (Admission Mandatory): Advertised in the EDCA parameter set element to indicate the admission control is required for each of the ACs.

EDCA AP Paramenters:

Theses values of AIFS, CWmin, and CWmax are announced by the AP via beacon frames. The AP can adapt these parameters dynamically depending on the network conditions. Basically, the smaller AIFS and CWmin, the shorter the channel access delay for the corresponding