Achieving MAC layer fairness in wireless packet networks
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Distributed fair scheduling in a wireless LAN
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Distributed multi-hop scheduling and medium access with delay and throughput constraints
Proceedings of the 7th annual international conference on Mobile computing and networking
An Implicit Prioritized Access Protocol for Wireless Sensor Networks
RTSS '02 Proceedings of the 23rd IEEE Real-Time Systems Symposium
Error Resilient Video Transmission over Wireless Networks
WSTFES '03 Proceedings of the IEEE Workshop on Software Technologies for Future Embedded Systems
Fair Real-Time Traffic Scheduling over a Wireless LAN
RTSS '01 Proceedings of the 22nd IEEE Real-Time Systems Symposium
Adaptive service differentiation for QoS provisioning in IEEE 802.11 wireless ad hoc networks
PE-WASUN '04 Proceedings of the 1st ACM international workshop on Performance evaluation of wireless ad hoc, sensor, and ubiquitous networks
Proceedings of the 2nd ACM international workshop on Wireless mobile applications and services on WLAN hotspots
IEEE Transactions on Parallel and Distributed Systems
Temporal Fairness Provisioning in Multi-Rate Contention-Based 802.11e WLANs
WOWMOM '05 Proceedings of the Sixth IEEE International Symposium on World of Wireless Mobile and Multimedia Networks
Performance analysis for IEEE 802.11e EDCF service differentiation
IEEE Transactions on Wireless Communications
IEEE 802.11 protocol: design and performance evaluation of an adaptive backoff mechanism
IEEE Journal on Selected Areas in Communications
A transport protocol for supporting multimedia streaming in mobile ad hoc networks
IEEE Journal on Selected Areas in Communications
EDCA-TM: IEEE 802.11e MAC enhancement for wireless multi-hop networks
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Adding multicast capabilities to wireless multi-hop token-passing protocols: extending the RT-WMP
ETFA'09 Proceedings of the 14th IEEE international conference on Emerging technologies & factory automation
NTMS'09 Proceedings of the 3rd international conference on New technologies, mobility and security
Quality of Service in mobile ad hoc networks: a survey
International Journal of Ad Hoc and Ubiquitous Computing
Journal of Systems and Software
Hi-index | 0.00 |
Ad hoc wireless networks with their widespread deployment, now need to support applications that generate multimedia and real-time traffic. Video, audio, real-time voice over IP, and other multimedia applications require the network to provide guarantees on the Quality of Service (QoS) of the connection. The 802.11e Medium Access Control (MAC) protocol was proposed with the aim of providing QoS support at the MAC layer. The 802.11e performs well in wireless LANs due to the presence of Access Points (APs), but in ad hoc networks, especially multi-hop ones, it is still incapable of supporting multimedia traffic. One of the most important QoS parameters for multimedia and real-time traffic is delay. Our primary goal is to reduce the end-to-end delay, thereby improving the Packet Delivery Ratio of multimedia traffic, that is, the proportion of packets that reach the destination within the deadline, in 802.11e based multi-hop ad hoc wireless networks. Our contribution is threefold: first we propose dynamic ReAllocative Priority (REAP) scheme, wherein the priorities of packets in the MAC queues are not fixed, but keep changing dynamically. We use the laxity and the hop length information to decide the priority of the packet. ReAP improves the PDR by over 28% in comparison with 802.11e, especially under heavy loads. Second, we introduce Adaptive-TXOP (A-TXOP), where transmission opportunity (TXOP) is the time interval during which a node has the right to initiate transmissions. This scheme reduces the delay of video traffic by reducing the number of channel accesses required to transmit large video frames. It involves modifying the TXOP interval dynamically based on the packets in the queue, so that fragments of the same packet are sent in the same TXOP interval. A-TXOP is implemented over ReAP to further improve the performance of video traffic. ReAP with A-TXOP helps in reducing the delay of video traffic by over 27% and further improves the quality of video in comparison with ReAP without A-TXOP. Finally, we have TXOP-sharing, which is aimed at reducing the delay of voice traffic. It involves using the TXOP to transmit to multiple receivers, in order to utilize the TXOP interval fully. It reduces the number of contentions to the channel and thereby reduces the delay of voice traffic by over 14%. A-TXOP is implemented over ReAP to further improve the performance of voice traffic. The three schemes (REAP, A-TXOP, and TXOP-sharing) work together to improve the performance of multimedia traffic in 802.11e based multi-hop ad hoc wireless networks.