Dynamic Proportional Delay Differentiation Scheduling over IEEE 802.11 Wireless Network

Yoon, Kyungae; Kim, Jong-Won

doi:10.1007/978-3-540-45076-4_25

Cited by 2 publications

(4 citation statements)

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“…Recently, by extending [2], we have tried to enhance the MAC to guarantee delay proportionally according to the priority in [4]. By linking the weighted time priority (WTP) scheduling and differentiated DIFS interval in the MAC layer, enhanced MAC is demonstrated to provide more consistent differentiation even when the WLAN AP is heavily loaded.…”

Section: Modified Differenciation Mechanisms For Ieee 80211 Wlanmentioning

confidence: 99%

“…By linking the weighted time priority (WTP) scheduling and differentiated DIFS interval in the MAC layer, enhanced MAC is demonstrated to provide more consistent differentiation even when the WLAN AP is heavily loaded. Differentiated MAC for the WLAN adopted in this paper is based on [3] and [4]. In standard IEEE 802.11e, access categories (ACs) are defined: best effort, video probe, video, voice, and others.…”

Section: Modified Differenciation Mechanisms For Ieee 80211 Wlanmentioning

confidence: 99%

“…The required network adaptation is guided by the layered relative priority index (RPI) that extends the RPI for standard-based video codecs (e.g., ITU-T H.263+, ISO/IEC MPEG-4) [9]. For the required differentiation in wireless networks, modified version of enhanced IEEE 802.11e MAC is adopted [3,4]. Thus, the overall framework is not limited to a specific layer.…”

Section: Introductionmentioning

confidence: 99%

“…For the loss differentiation, we may adopt the active queue management scheme combined with the enhanced MAC of IEEE 802.11e. For the delay differentiation, we may use WTP (weighting time period) based scheduling tied with inter-frame spacing and contention window [4]. Finally, the delivered packets are adaptively processed at the receiver to match the receiver capability and user preference.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Network-adaptive video transmission and differentiation mechanisms over IEEE 802.11 wireless LAN

Lee

Yoon

Kim

2003

Applications of Digital Image Processing XXVI

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Video over IEEE 802.11-based wireless LAN is facing lots of challenges due to the dynamically varying wireless channel and due to lack of appropriate QoS differentiation capability in the IEEE 802.11 MAC (medium access control). In this paper, differentiation mechanism coordinated by both video application and wireless MAC is adopted to realize a network-adaptive video transmission over the wireless LAN. To support the required QoS differentiation for loss/delay sensitive video stream, modified version of EDCF (enhanced distributed coordination function) MAC is utilized, which provides loss/delay differentiation by controlling contention window size and distributed inter-frame space interval. The differentiation is then matched by the prioritization of video application, represented in the relative priority index (RPI). The network simulation with NS2 (network simulator) verifies that the proposed prioritization and modified EDCF improves the performance of video transmission over IEEE 802.11 wireless LAN.Keywords: End-to-end wireless video, IEEE 802.11 wireless LAN, MAC differentiation mechanism, joint sourcechannel error control, network adaptive media transmission, and packet prioritization.

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Section: Modified Differenciation Mechanisms For Ieee 80211 Wlanmentioning

confidence: 99%

Section: Modified Differenciation Mechanisms For Ieee 80211 Wlanmentioning

confidence: 99%