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Radio link failure (RLF) is a common phenomenon in all radio access technologies like GSM or UMTS or wireless-LAN etc., when the radio channel signal strength is weak to continue with the application. RLF is a local event detected by mobile handset (or user equipment-UE) immediately and network nodes come to know later. It is also difficult to recover for the UE due to low signal. Hence, RLF has to...
It has been a challenge to support high speed (above 200 kms/hr - freeways and high speed train) mobile user with broadband data communication. Research community efforts are underway to develop wide area networks (wireless access and optical backbone) to support broadband to high speed vehicular users. ITU-R has proposed the International Mobile Telecommunication-Advanced (IMT-Advanced) technical...
In this paper a novel interoperability strategy and architecture is described that guarantees the quality of service (QoS) requirements for applications originating in IEEE 802.11e based WLAN to a serving IEEE 802.16 based WirelessMAN and vice versa. The architecture for mapping QoS requirements makes use of inherent MAC layer convergence flexibilities available in these networks along with features...
In this paper, we propose Sniff and Embark (Sniff) protocol, a novel frame sniffing and token passing based approach to provide QoS in WLANs. Our simulations show that S^E performs significantly better than EDCF over the performance metrics - delay, jitter and time- constrained frame drop ratio.
The IEEE 802.11e standard defines the enhanced distributed coordination function (EDCF) to improve the quality of service (QoS) in a wireless local area network (WLAN). The EDCF is a CSMA/CA based protocol, where stations compete for the medium with prioritized contention parameters. Also defined in the 802.11e standard is the polling mode of the hybrid coordination function (HCF - polling), which...
The wireless local area network (WLAN) is becoming popular due to its inherent strength. However, there are major challenges to be over come in WLAN. Some of them are quality of service (QoS), seamless mobility and security. Extensive research is being carried out to address QoS in WLAN. In this paper we propose a new medium access control (MAC) protocol for QoS (New-MACQoS) in WLAN. It has been observed...
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