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- W90341344 abstract "ABSTRACT The IEEE 802.11e amendment is being designed to be compatible with the legacy 802.11 standard, therefore users with 802.11 network card will be able to connect and work without problems in a new QoS Basic Service Set (QBSS). However, this coexistence may deteriorate QoS support provided by the new standard. In this paper the influence of 802.11b DCF stations on the QoS provision in IEEE 802.11e standard is analysed and new mechanism for performance improvement of legacy IEEE 802.11 stations is also proposed. KEY WORDS WLAN, Coexistence and QoS. 1. Introduction The IEEE 802.11 is one of the most popular and implemented WLAN technologies. This wide acceptance resulted in numerous investigations to optimize, enhance and extend the usage of this promising technology. Moreover this technology is also gaining a great importance as it is believed that it will be a part of future heterogeneous wireless communication networks [1]. At the end of the last year a significant work in the field of quality of service in wireless IEEE 802.11 network was completed by IEEE Task Group E (TGe). The main objective of TGe was to detail QoS enhancements to the legacy 802.11standard .Standarditisaon efotrs of TGe resulted in introduction of a new mechanism called Hybrid Coordination Function (HCF) to the MAC layer of the legacy standard in order to guarantee the traffic’s QoS requirements [2]. Namely HCF is suggested with two access types: Enhanced Distributed Channel Access (EDCA) and HCF Controlled Channel Access (HCCA). They are backward compatible with the legacy IEEE 802.11 Distributed Coordination Function (DCF) and Point Coordination Function (PCF) schemes and provide different QoS provisioning methods. Moreover, the feasibility of the QoS support was demonstrated in [3], [4] assuming a standalone IEEE 802.11e network. However, in the near future most of the wireless LANs will be formed by two types of terminals: QoS enabled and non-QoS stations. Therefore in this paper, we concentrate on the question of coexistence of the new IEEE 802.11 QoS enabled wireless stations (QSTA) and the legacy IEEE 802.11 stations in a BSS with QoS facilities, assuming advanced multimedia services over both types of stations. In Section 2, the main QoS limitations of legacy 802.11 are presented jointly with the corresponding solutions proposed in the emerging 802.11e standard. In Section 3 the Hierarchical Token Bucket (HTB) queuing mechanism for DCF is detailed. Section 4 follows with preliminary study on coexistence between mentioned technologies. Finally, Section 5 summarizes the main points of the paper." @default.
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- W90341344 date "2006-01-01" @default.
- W90341344 modified "2023-09-27" @default.
- W90341344 title "Coexistence of IEEE 802.11B and IEEE 802.11E Stations in QoS Enabled Wireless Local Area Network." @default.
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