Abstract
Most of the centralized QoS mechanisms for WLAN MAC layer are only able to guarantee QoS parameters for CBR video traffic effectively. On the other hand, the existing distributed QoS mechanisms are only able to differentiate between various traffic streams without being able to guarantee QoS. This paper addresses these deficiencies by proposing a new distributed QoS scheme that guarantees QoS parameters such as delay and throughput for both CBR and VBR video traffics. The proposed scheme is also fair for all streams and it can adapt to the various conditions of the network. To achieve this, three fields are added to the RTS/CTS frames whose combination with the previously existing duration field of RTS/CTS frames guarantees the periodic fair adaptive access of a station to the channel. The performance of the proposed method has been evaluated with NS-2. The results showed that it outperforms IEEE 802.11e HCCA.
Highlights
The wireless LAN (WLAN) systems have received increasing popularity in recent years because they are cost effective, comfortable, and have high capacity
The fair hybrid coordination function (HCF) (FHCF) proposed in [12] is selected as the third scheme to compare with our method
The destination is QoS capable AP (QAP) that contains a point coordinator (PC) to satisfy the requirements for HCF controlled channel access (HCCA) and FHCF, yet it is an ordinary QoS capable station (QSTA) for our proposed method
Summary
The wireless LAN (WLAN) systems have received increasing popularity in recent years because they are cost effective, comfortable, and have high capacity. In [2], the authors proposed a new adaptive fairdistributed method This method enhances the EDCA of IEEE 802.11e by increasing the contention window when the channel is busy. In [9], authors proposed a new scheduling algorithm in link layer to support multimedia services with guaranteed QoS in WLAN Their scheduling algorithm is based on the HCF. If a station requires a contention-free access to the channel by getting TXOP, it should send a QoS request frame to the QAP containing several parameters. These parameters are mean data rate of the application, the maximum service. It can be deduced that the TXOPi is the time required to send Ni packets for a specific application
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