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Efficient QoS Management in Ad Hoc Networks

Learn about QoS parameters in ad hoc BSS, role of hybrid coordinator, separation of AP and HC functions, QBSS organization, and contact for more information.

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Efficient QoS Management in Ad Hoc Networks

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  1. P802.11e Hybrid coordinatorandad hoc QBSS Peter JohanssonCongruent Software, Inc.PJohansson@ACM.org Peter Johansson / Congruent Software, Inc.

  2. What is QoS in an ad hoc BSS? • There is no access point in an ad hoc BSS • Part of the HCF may exist in an ad hoc BSS • EDCF requires no hybrid coordinator • EDCF requires shared set of parameters among the participating stations • In a BSS with an AP, QoS parameters are broadcast with the beacon • P802.11e could establish default values • Fully-fledged HCF requires an HC Peter Johansson / Congruent Software, Inc.

  3. Access point (AP) Authentication Association Distribution From / to BSS From / to ESS Integration Hybrid coordinator (HC) Coordination Beacon Scheduling Distribution From / to BSS Cleanly split AP and HC functions • Separation resolves the confusion created by the historical co-location of AP and PC functionality • Suited to AV QBSS (may not need ESS distribution) Peter Johansson / Congruent Software, Inc.

  4. Revised terminology • BSS type determined by mix of capabilities HC PC AP No No No IBSS No No Yes ? No Yes BSS Yes No No QBSS No Yes • Stations that form a QBSS organize themselves around a hybrid coordinator • There may or may not be an AP present • What is a BSS with only an AP? Peter Johansson / Congruent Software, Inc.

  5. Current definition of QBSS • P802.11e Draft 1.0 clause 3.63 “A basic service set (BSS) that supports LAN applications with quality of service (QoS) requirements by providing a QoS facility for communication via the wireless medium (WM).” • Consistent with taxonomy on previous slide • A QBSS is the set of stations under mutual control of a hybrid coordinator (HC) … whether or not an AP is present! Peter Johansson / Congruent Software, Inc.

  6. Contact information Peter Johansson Congruent Software, Inc.98 Colorado AvenueBerkeley, CA 94707 (510) 527-3926(510) 527-3856 FAX PJohansson@ACM.org Peter Johansson / Congruent Software, Inc.

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