Harshal, I need more information here. We assume 2 cases: Case 1: A QSTA knows it requires quaranteed downstream bandwidth and it gets scheduled TXOP from the QAP through TSPEC negotiation. In this case, the AP SME is aware of the bandwidth reservation for the downstream flow. Case 2: Downstream traffic is iniatiated by an application residing in the QAP above the wireless MAC. It requires rather constant bandwidth over a long time (streaming 1 hour video, for example). For some reasons, this downstream flow is not started by QSTA, no TSPEC has been exchanged, and thus no bandwidth reservation. In case 2, is it still possible to protect the traffic? If not protected, it will be compromised due to other QoS streams (polled TXOP). Please advise. cw Harshal Chhaya <[EMAIL PROTECTED]> wrote: cw wong wrote: > I understand that the scheduled TXOP is requested by an QSTA and granted > by the AP SME. > In this situation, if the AP SME is not aware of the AP requirement for > guaranteed downstream bandwidth, it may think it has sufficient capacity and > accept new TS request from QSTA. Once new TS is formed, the AP will protect > it by all means and the AP's internally generated traffic will be compromised. > Any comments?
CW, I think it is quite unlikely that the AP SME does not know the details of its downstream traffic. The admission control module has to know about all the scheduled traffic passing through the AP - both upstream and downstream. If it does not have this complete picture, it cannot make correct decisions about admitting new flows and cannot guarantee QoS to any traffic. If a situation occurs where a new downstream flow can potentially disrupt an established TS, the AP can handle it as it chooses. It could notify the QSTA that the TSPEC needs to be changed or it could throttle the new flow and keep the established TSPEC intact. Hope this helps. - Harshal http://www.wireless--lan.com/ http://www.wlanforum.com/ http://groups.yahoo.com/group/wirelesslan/ --------------------------------- YAHOO! GROUPS LINKS Visit your group "wirelesslan" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. --------------------------------- --------------------------------- Meet your soulmate! Yahoo! Asia presents Meetic - where millions of singles gather --------------------------------- Do you Yahoo!? New and Improved Yahoo! Mail - 1GB free storage! [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor --------------------~--> Most low income households are not online. Help bridge the digital divide today! http://us.click.yahoo.com/I258zB/QnQLAA/TtwFAA/5AhqlB/TM --------------------------------------------------------------------~-> http://www.wireless--lan.com/ http://www.wlanforum.com/ http://groups.yahoo.com/group/wirelesslan/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/wirelesslan/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
