Modifying the IEEE 802.11 MAC Protocol for Multi-hop Reservation in MIMC Tactical Ad Hoc Networks

2011 ◽  
Author(s):  
Youn-Chul Cho ◽  
Sun-Joong Yoon ◽  
Young-Bae Ko
Keyword(s):  
Ad Hoc Networks ◽  
Ieee 802.11 ◽  
Ad Hoc ◽  
Mac Protocol ◽  
Ieee 802.11 Mac ◽  
Ieee 802.11 Mac Protocol ◽  
Hoc Networks ◽  
802.11 Mac

Improving Throughput of Starved TCP Flow by Sidestepping Bottleneck Nodes Using Concurrent Transmission

2012 ◽  
pp. 47-60
Author(s):  
Rajesh Verma ◽  
Arun Prakash ◽  
Rajeev Tripathi ◽  
Neeraj Tyagi
Keyword(s):  
Congestion Control ◽  
Ieee 802.11 ◽  
Ad Hoc ◽  
Mac Protocol ◽  
Concurrent Transmission ◽  
Ieee 802.11 Mac ◽  
Ieee 802.11 Mac Protocol ◽  
Congestion Control Mechanism ◽  
Hoc Networks ◽  
802.11 Mac

The TCP congestion control mechanism along with unfairness problem poses poor performance when IEEE 802.11 MAC protocol is used in multi-hop ad hoc networks because the traditional TCP has poor interaction with the IEEE 802.11 MAC protocol. Because of the greedy nature of TCP, starvation problem of TCP flows with longer paths is severe. In this paper, we first illustrate that the fairness, congestion control and medium contention are closely coupled issues and the spatial reuse of the channel can improve the performance of wireless ad hoc network. By using concurrent transmission protocol at the MAC layer, like CTMAC, in multi-hop networks we can achieve simultaneous transmissions within the interference regions. Further, we illustrate with extensive simulations in ns-2 that by scheduling multiple concurrent transmissions along the path links, the starvation problem due to greedy nature of TCP can be eliminated and ensuing higher flow throughput and lower end-to-end delay.

scholarly journals Performance Evaluation of Modified IEEE 802.11 MAC for Multi-Channel Multi-Hop Ad Hoc Networks

2003 ◽  
Vol 04 (03) ◽  
pp. 345-359 ◽  
Author(s):  
Jiandong Li ◽  
Zygmunt J. Haas ◽  
Min Sheng ◽  
Yanhui Chen
Keyword(s):  
Access Control ◽  
Ad Hoc Networks ◽  
Ieee 802.11 ◽  
Scaling Laws ◽  
Ad Hoc ◽  
Single Channel ◽  
Mac Protocol ◽  
Data Packets ◽  
Hoc Networks ◽  
802.11 Mac

In this paper, the IEEE 802.11 multiple access control (MAC) protocol was modified for use in multi-channel, multi-hop ad hoc networks through the use of a new channel-status indicator. In particular, in the modified protocol, the RTS/CTS dialogue is exchanged on the common access control channel and data packets are transmitted on a selected traffic channel. We have evaluated the improvement due to the multi-channel use and we report in this paper on the results of the per-node throughput and the end-to-end delay for different network sizes. Using these results, we were able to propose a number of per-node throughput scaling laws. Our simulation results show that the per-node throughput with multiple channels for the fully connected, the line, and the grid ad hoc network topologies increases by 90% to 253%, by 47%, and by 139% to 163%, respectively, for networks with 16 to 64 nodes, as compared with that of a single channel.

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