doc.: IEEE /678r1 Submission January 2003 Mark Bilstad, Cisco SystemsSlide 1 Uniform e Admissions Control Signaling for HCF and EDCF Bob Meier, Liwen Wu, Mark Bilstad Cisco Systems November 11, 2002

doc.: IEEE /678r1 Submission January 2003 Mark Bilstad, Cisco SystemsSlide 2 Considerations/Issues There is a recognized need for Explicit Admissions Control Signaling, independent of the access method Explicit EDCF Admissions Control enables infrastructure policy and policing. –For example, it may be desirable to limit QoS bandwidth for “guest” users in an enterprise network.

doc.: IEEE /678r1 Submission January 2003 Mark Bilstad, Cisco SystemsSlide 3 Considerations/Issues Explicit admissions control is not useful unless all QSTAs participate –A method is needed for a WSTA to determine whether explicit admissions control is required The current TSPEC Status Codes are insufficient. A QSTA cannot determine if a TSPEC is rejected because 1) resources are not available, or 2) HCF Polling is not enabled for the traffic type.

doc.: IEEE /678r1 Submission January 2003 Mark Bilstad, Cisco SystemsSlide 4 Summary of proposed changes TSPEC –Add Access Method bits to TSinfo field of TSPEC IE –Add new TSPEC status code Delete text that prohibits EDCF access for stations with admitted TSPECs Add 8 new flags to QoS Parameter Set IE to indicate when explicit vs. distributed admissions control is in use per user priority

doc.: IEEE /678r1 Submission January 2003 Mark Bilstad, Cisco SystemsSlide 5 Allocate 2 bits in the TSPEC TSInfo Field in Figure 42.8 B13B14 Polled access Contention- based access 11 QSTA indicates its capabilities in the ADDTS request HC responds with what will be used in the ADDTS response

doc.: IEEE /678r1 Submission January 2003 Mark Bilstad, Cisco SystemsSlide 6 Add text to section A QSTA sets the TSInfo “Access” fields in an ADDTS request to indicate to the HC the access methods that it will accept for the traffic stream and to indicate its access method capabilities. The fields are set in an ADDTS Request as follows: The Polled Access field is set to 1 if the QSTA will accept access via HCF polling. The Contention-based Access field is set to 1 if the QSTA will accept EDCF as the access method. An HC uses the TSInfo “Access” fields in an ADDTS Response to establish the access method used for the traffic stream for an accepted TSPEC. The HC cannot establish an access method where the QSTA has indicated that it will NOT accept the access method. The HC sets exactly one of these bits to 1 to indicate which type of access has been accepted for the request.

doc.: IEEE /678r1 Submission January 2003 Mark Bilstad, Cisco SystemsSlide 7 Remove restrictions in text Delete the following paragraph in : “HCF contention-based channel access shall not be used to transmit MSDUs belonging to traffic streams for which the traffic specification as furnished to/by the HC has a specified minimum data rate and a specified delay bound, except as may be necessary to obtain the first polled TXOP from the HC for a newly added or modified traffic stream.”

doc.: IEEE /678r1 Submission January 2003 Mark Bilstad, Cisco SystemsSlide 8 New TSPEC Status Code Status CodeResult CodeDefinition 5NOT_ENABLEDThe TS has not been created because the requested access method is not enabled for the traffic type reserved Table 20.5 – Status Codes

doc.: IEEE /678r1 Submission January 2003 Mark Bilstad, Cisco SystemsSlide 9 Add 8 flags to the QoS Parameter Set AP sets flag to 1 when explicit admissions control is required for the respective user priority Octets: Element ID (12) Length (46) QoS Parameter Set Count (existing) b0..b7: ExplicitAd mCtrl[UP]

doc.: IEEE /678r1 Submission January 2003 Mark Bilstad, Cisco SystemsSlide 10 Other considerations For explicit admissions control, TXOPBudget can be used by roaming WSTA to predict whether a TSPEC is likely to be admitted Flow-specific access parameters (CWmin, CWmax, AIFS, TXOPlimit) can be returned in the ADDTS response

doc.: IEEE /678r1 Submission January 2003 Mark Bilstad, Cisco SystemsSlide 11 New Access Parameters IE Flow-specific uplink access parameters are returned in the ADDTS response Octets: Element ID (TBD) Length (6) AIFS value CWmin value CWmax value TXOPLi mit