Hello Harshal, 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
Harshal Chhaya <[EMAIL PROTECTED]> wrote: cw wong wrote: > 802.11e specify a method to reserve bandwidth through tspec negotiation, > and this is only initiated by a qsta in qbss. > In the event that an application (resides in a QAP) needs guaranteed > bandwidth for > its downstream traffic, how can the application obtain this reserved > bandwidth with > its own sme? Please advise. CW, Please note that the TSPEC-based reservation is only for the HC (QAP) to schedule polls to the QSTA. It is not a true reservation in that other devices in the network are not aware of this scheduled traffic. Under HCCA rules, the QAP can start transmitting a PIFS interval after the channel is free. This allows it to pre-empt all other QSTAs who have to wait at least a DIFS before they can start their transmission. So for any downstream traffic, the QAP can transmit it on its own by pre-empting all the other QSTAs and ensure that it meets the schedule. It doesn't need to reserve any resources at the QSTA and so doesn't need to use TSPECs. Hope this helps. Regards, - 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 [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/
