DocumentCode :
3192245
Title :
A New Solution to Improve the Link Failure Tolerance in Mobile Ad hoc Networks
Author :
Radha, S ; Ravindran, Niranjay ; Mani, Sanjay ; Kandasamy, Vinod
Author_Institution :
Department of ECE, SSN College of Engineering, SSN Nagar, Chennai, INDIA, Email: radha@ssnce.ac.in
fYear :
2005
fDate :
11-13 Dec. 2005
Firstpage :
539
Lastpage :
542
Abstract :
An ad hoc network is a mobile wireless network that has no fixed access point or centralized infrastructure. Each node in the network also functions as a mobile router of data packets for other nodes. However, due to node mobility, link failures in such networks are very frequent and render certain standard protocols inefficient resulting in wastage of power and loss in throughput. We propose two solutions to alleviate the problems caused by link failures. Network-Link scheme, deals with preventing `false´ link failures and in avoiding actual link failures. The scheme involves predicting a failure in advance by monitoring the power levels of all nodes in communication. On the other hand, the Transport-Link scheme deals with the inability of TCP to distinguish between link failures and congestion. TCP, as such, assumes that a packet loss is due to network congestion and invokes congestion control measures. However, in ad hoc networks, packet loss is most often due to link failures, and the congestion control methods invoked only reduce the throughput. Our second solution informs TCP of a link failure thus allowing it to treat such cases differently. In both cases, we observed an improvement in throughput and power utilization efficiency when compared to standard cases: the Network-Link scheme resulted in an average throughput increase of 1.74 times and the Transport-Network scheme, an average increase of 1.71 times. Both schemes also resulted in a reduction in the percentage of Network layer control packets transmitted, thereby improving power utilization.
Keywords :
Ad hoc networks; GloMoSim; Network-link scheme; TCP; Transport-link scheme; Access protocols; Ad hoc networks; Condition monitoring; Educational institutions; Intelligent networks; Mobile ad hoc networks; Physical layer; Throughput; Transmitters; Wireless networks; Ad hoc networks; GloMoSim; Network-link scheme; TCP; Transport-link scheme;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
INDICON, 2005 Annual IEEE
Print_ISBN :
0-7803-9503-4
Type :
conf
DOI :
10.1109/INDCON.2005.1590229
Filename :
1590229
Link To Document :
بازگشت