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The new IEEE 802.lie standard is designed to provide QoS guarantees to different types of multimedia applications in WLAN. IEEE 802.lie defines two channel access mechanisms: HCCA and EDCA. Basically, HCCA is more suitable for providing strict QoS guarantees than EDCA because of its centralized TXOP allocation manner and enhanced capability of initiating a transmission at any time during the beacon...
In future wireless networks, the packet scheduler needs to support heterogeneous classes of traffic with different BER and other QoS requirements. In this paper, we proposed a modified BER scheduling scheme for CDMA networks by combining the existing WISPER scheme with a two-state Markov chain channel model. Four error-deal algorithms are used in this scheme. Simulation experiments based on NS-2 illustrate...
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