Presentation | 2006-06-23 A New Scheduler to Guarantee Delay Bound with Bandwidth Optimization for HCCA in IEEE 802.11e WLANs Yuhi Higuchi, Augusto Foronda, Chicara Ohta, Yoji Okada, Masahiko Yoshimoto, |
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Abstract(in Japanese) | (See Japanese page) |
Abstract(in English) | IEEE 802.11e Medium Access Control (MAC) is a supplement to the IEEE 802.11 Wireless Network (WLAN) standard to support Quality of Service (QoS). The 802.11e MAC defines a new coordination function, namely Hybrid Coordination Function (HCF), which takes the QoS requirements of flows into account and allocates transmission opportunity (TXOP) to stations. On the basis of mean sending rate, delay of variable bit rate (VBR) traffic cannot be bounded with the reference HCF scheduling algorithm proposed in this supplement. In this paper, we propose a new scheduling algorithm that utilizes the token bucket and a modified Latency-Rate (LR) scheduling algorithm to guarantee a bounded delay for HCF controlled channel access (HCCA). The new TXOP is calculated to optimize the number of stations accommodated and takes into account delay bound and token bucket parameters. We show that is possible to obtain the worst-case performance guarantees on delay. Properties of the proposal are investigated both theoretically and using ns-2 simulations. We present a set of simulations with both constant bit rate (CBR) and VBR flows and performance comparisons with HCF scheduling algorithm. The results show that the upper bounds can be achieved for a large range ofnetworks load. |
Keyword(in Japanese) | (See Japanese page) |
Keyword(in English) | QoS / IEEE802.11e / HCCA / Delay / Optimization |
Paper # | IN2006-28 |
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Committee | IN |
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Conference Date | 2006/6/15(1days) |
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Registration To | Information Networks (IN) |
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Language | ENG |
Title (in Japanese) | (See Japanese page) |
Sub Title (in Japanese) | (See Japanese page) |
Title (in English) | A New Scheduler to Guarantee Delay Bound with Bandwidth Optimization for HCCA in IEEE 802.11e WLANs |
Sub Title (in English) | |
Keyword(1) | QoS |
Keyword(2) | IEEE802.11e |
Keyword(3) | HCCA |
Keyword(4) | Delay |
Keyword(5) | Optimization |
1st Author's Name | Yuhi Higuchi |
1st Author's Affiliation | Department of Computer System, Kobe University() |
2nd Author's Name | Augusto Foronda |
2nd Author's Affiliation | Department of Computer System, Kobe University |
3rd Author's Name | Chicara Ohta |
3rd Author's Affiliation | Department of Computer System, Kobe University |
4th Author's Name | Yoji Okada |
4th Author's Affiliation | Information and Communication Laboratories, Sumitomo Electric Industries |
5th Author's Name | Masahiko Yoshimoto |
5th Author's Affiliation | Department of Computer System, Kobe University |
Date | 2006-06-23 |
Paper # | IN2006-28 |
Volume (vol) | vol.106 |
Number (no) | 118 |
Page | pp.pp.- |
#Pages | 6 |
Date of Issue |