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Comparative analysis of ADTCP and MADTCP: Congestion Control Techniques for improving TCP performance over Adhoc Netw

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International Journal of Mobile Network Communications & Telematics (IJMNCT) Vol.2, No.4, August 2012

Comparative analysis of ADTCP and M-ADTCP:
Congestion Control Techniques for improving
TCP performance over Ad-hoc Networks.
2

Sreenivasa B.C 1, G.C. Bhanu Prakash ,K.V. Ramakrishnan3
1

Sr. Lecturer Department of Computer Science and Engineering
Research Scholar, Anna University Coimbatore.
2
Professor Department of Computer Science and Engineering,
Sir M Visvesvaraya Institute of Technology- Bangalore, INDIA
3
Visiting professor Department of Computer Science and Engineering,
CMRIT- Bangalore, INDIA
Email: srinivasbc@rediffmail.com

ABSTRACT
Identifying the occurrence of congestion in a Mobile Ad-hoc Network (MANET) is a major task. The inbuilt
congestion control techniques of existing Transmission Control Protocol (TCP) designed for wired networks do not handle the unique properties of shared wireless multi-hop link. There are several approaches
proposed for detecting and overcoming the congestion in the mobile ad-hoc network. In this paper we
present a Modified AD-hoc Transmission Control Protocol (M-ADTCP) method where the receiver detects
the probable current network status and transmits this information to the sender as feedback. The sender
behavior is altered appropriately. The proposed technique is also compatible with standard TCP.

KEY WORDS
Congestion, TCP, Ad-hoc

1. Introduction
Mobile Ad-hoc Networks (MANET) do not have a fixed infrastructure. MANETs uses standard
IEEE 802.11 MAC. In ad-hoc network each node (Mobile device) acts as a router, which helps in
forwarding packets from a source to destination. MANETs are suitable in situations where fixed
infrastructure is unavailable such as Military war fields, disaster relief, sensor networks, Wireless
mesh network etc.
TCP congestion control is very much suitable for Internet, whereas for MANETs the same TCP is
not suitable due to some of the specific properties like node mobility and shared wireless multihop channel. A slow delivery and packet loss occurs due to node mobility and unreliable shared
medium. The delay in the packet delivery or packet losses is due to route change should not be
misread as congestion.
In Internet when congestion occurs it is normally concentrated on a single router, whereas, due to
the shared medium of the MANET congestion will not overload the mobile nodes but has an effect on the entire coverage area. The changes in the routing of the packet might lead to pack...
International Journal of Mobile Network Communications & Telematics (IJMNCT) Vol.2, No.4, August 2012
DOI : 10.5121/ijmnct.2012.2407 61
Comparative analysis of ADTCP and M-ADTCP:
Congestion Control Techniques for improving
TCP performance over Ad-hoc Networks.
Sreenivasa B.C
1,
G.C. Bhanu Prakash
2
,K.V. Ramakrishnan
3
1
Sr. Lecturer Department of Computer Science and Engineering
Research Scholar, Anna University Coimbatore.
2
Professor Department of Computer Science and Engineering,
Sir M Visvesvaraya Institute of Technology- Bangalore, INDIA
3
Visiting professor Department of Computer Science and Engineering,
CMRIT- Bangalore, INDIA
Email: srinivasbc@rediffmail.com
ABSTRACT
Identifying the occurrence of congestion in a Mobile Ad-hoc Network (MANET) is a major task. The inbuilt
congestion control techniques of existing Transmission Control Protocol (TCP) designed for wired net-
works do not handle the unique properties of shared wireless multi-hop link. There are several approaches
proposed for detecting and overcoming the congestion in the mobile ad-hoc network. In this paper we
present a Modified AD-hoc Transmission Control Protocol (M-ADTCP) method where the receiver detects
the probable current network status and transmits this information to the sender as feedback. The sender
behavior is altered appropriately. The proposed technique is also compatible with standard TCP.
KEY WORDS
Congestion, TCP, Ad-hoc
1. Introduction
Mobile Ad-hoc Networks (MANET) do not have a fixed infrastructure. MANETs uses standard
IEEE 802.11 MAC. In ad-hoc network each node (Mobile device) acts as a router, which helps in
forwarding packets from a source to destination. MANETs are suitable in situations where fixed
infrastructure is unavailable such as Military war fields, disaster relief, sensor networks, Wireless
mesh network etc.
TCP congestion control is very much suitable for Internet, whereas for MANETs the same TCP is
not suitable due to some of the specific properties like node mobility and shared wireless multi-
hop channel. A slow delivery and packet loss occurs due to node mobility and unreliable shared
medium. The delay in the packet delivery or packet losses is due to route change should not be
misread as congestion.
In Internet when congestion occurs it is normally concentrated on a single router, whereas, due to
the shared medium of the MANET congestion will not overload the mobile nodes but has an ef-
fect on the entire coverage area. The changes in the routing of the packet might lead to packet
losses which is not caused due to congestion in the network should not be erroneously misinter-
preted as TCP congestion. This can lead to wrong reactions of TCP congestion control. Further-
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