# Student, Haryana Engineering College, Haryana, India 2 H.O.D (CSE), Haryana Engineering College, Haryana, India

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4 Figure 5 Slow start threshold over 200 simulated times with TCP-SACK. Figure 6. Slow start threshold over 200 simulated times with TCP-SACK. 2. Performance evaluation of TCP by implementing TCP-BO algorithm In this evaluation we have varied the disabling period T to be 1 and 2 times RTT (retransmission timer). 2.1 Disabling period T = RTT Once again the simulation was done for thirty five times by changing the position and movement of the 20 nodes and their speeds and average was taken. When the disabling period T is equal to one time the retransmission timer, as shown in figure 6. the maximum number of packets sent by TCP sender over 200 simulated time were found to be 1754.With the above result an average improvement of 13 % was found by implementing TCP-BO algorithm. In figure 6.6 the good put effect has been shown and the maximum number of packets received by the TCP receiver was about 1738, which improves the TCP good put by 12.7%. The above percentages improvement implies that out-of-order packets are really delivered due to multi-path route in case of TCP-SACK which degrades the performance of TCP, and implementing TCP-BO algorithm have improved the effect of out-of-order problem. Figure 7. The maximum number of packets sent by TCP sender over 200 simulated seconds (throughput), with TCP-BO (T = RTT) Figure 8. The maximum number of packets received by TCP sender over 200 simulation seconds (good put), with TCP- BO (T = RTT) 2015, IJARCSSE All Rights Reserved Page 871

5 In figure 9 and 10 TCP-BO shows larger congestion window size than TCP-SACK, this indicates better utilization of available bandwidth. The slow start threshold is shown in figure 11 and 12. As shown in figure 9, between 100 and 150 simulation seconds, the congestion window size (CWND) is better than that of shown in figure 10, which is the effect of detecting out-of-order packet and responded accordingly. In figure 10 between 150 and 200 simulation seconds only one packet has been sent at a time. But as shown in figure 10 between 150 and 200 seconds the congestion size is increased up to a maximum of 15 and many packets have been sent which is the effect of avoiding unnecessary calling of congestion control algorithm. Figure 9. Congestion window Vs simulated time with TCP-BO algorithm (T=RTT) Figure 10. Congestion window Vs simulated time with TCP-BO algorithm (T=RTT) Figure 11. Slow start threshold over 200 simulated time with TCP-BO (t=rtt) Figure 12. Slow start threshold over 200 simulated time with TCP-BO (t=rtt) 2.2. Disabling period T = 2 x RTT For disabling period T = 2 x RTT, as shown in figure 13, a maximum of 1668 packets have been sent by the TCP sender over 200 simulated times (throughput), which is compared to the base TCP-SACK, it improves the throughput by 7.54% but compared to disabling period of T = RTT, the throughput is decreased by 5.46%. 2015, IJARCSSE All Rights Reserved Page 872

6 When we see the good put effect, as shown in figure 14 for T = 2 x RTT, about 1668 packets have been received by the TCP receiver, which indicates that all the packets sent by the sender have been received by the receiver. The good put result compared with TCP-SACK is about 7.54%, which shows improvement compared to TCP-SACK and it decreases by 5.46% compared to T = RTT of TCP-BO. Figure 13. TCP throughput measured for TCP-BO for T =2 x RTT Figure 14. Good put result found by implementing TCP-BO with t=2xrtt Figure 15, 16, 17 and 18 show the congestion window and slow start threshold found by making the disabling period T = 2xRTT. The size of congestion window with in simulated time is some how good relative to base TCP-SACK, and drops to some extent compared to T = RTT. Figure 15. A congestion window Vs simulated time for t = 2* rtt Figure 16. congestion window Vs simulated time for t = 2xrtt Figure 17. Slow start threshold Vs simulated time for t = 2xrtt 2015, IJARCSSE All Rights Reserved Page 873

7 Figure 18. Slow start threshold Vs simulated time for t = 2xrtt Figure 19 and figure 20 show comparison of throughput and good put measurement for both TCP-SACK, and TCP-BO with disabling period T=RTT and T=2XRTT. All measures taken by the TCP-BO improve the throughput and good compared to TCP-SACK. For disabling period T = RTT, a throughput and good put improvement ratio of 13% and 12.7% have been achieved, respectively. And for a disabling period of T = 2xRTT, for both throughput and good put improvement ratio of 7.54% has been found. Figure 19. Comparison of throughput, TCP-SACK and TCP-BO Figure 20. Comparison of good put, TCP-SACK and TCP-BO IV. CONCLUSIONS The modification of TCP Detection of Out-of-Order and Response with Time Stamp (TCP-BO) algorithm in TCP- SACK, when multi-path routing protocol (TORA), is used in mobile ad hoc networks has been evaluated. First it is confirmed that out-of-order packet is really delivered due to multi-path route between TCP sender and receiver, which has significant performance degradation effect. TCP-BO algorithm improves the performance of TCP by detecting and responding for out-of-order packet delivery. Unnecessary invoking of congestion control algorithm and retransmission of packets were protected. All measures taken by the TCP-BO algorithm improve the bandwidth utilization and increase the throughput and good put up to 13% and 12.7% respectively, compared to TCP-SACK. The above percentage improvements implies that out-of-order packet is occurred in case of TCP-SACK which degrades the performance of TCP, and implementing TCP-BO algorithm have improved the effect of out-of-order problem. For disabling period T = RTT, a throughput and good put improvement ratio of 13% and 12.7% have been achieved, respectively. And for a disabling period of T = 2 x RTT, for both throughput and good put improvement ratio of 7.54% has been found which implies that disabling period of one times the round trip time is optimum for attaining good result. Theoretically the disabling period T = 2 x RTT, the TCP protocol would not respond fairly. Disabling period T = RTT is optimum time for the TCP to recover from out-of-order packet at the receiver side. The congestion window size and slow start threshold of TCP-SACK, and TCP-BO with T = RTT and T = 2 x RTT have been evaluated, increments of congestion window size for TCP-BO than TCP-SACK has been observed, which implies that unnecessary calling of congestion response algorithm and retransmission of packet have been avoided, which reduces the congestion window size and sending rate a lot. 2015, IJARCSSE All Rights Reserved Page 874

8 REFRENCES [1] K.Sunderesan, V.Anantharaman, R.SivaKumar, ATP reliable transport protocol for adhoc networks, Proceeding of 4 th ACM international Symposium on Mobihoc, June 2003pp [2] B. Bakshi, P. Krishna, N.H. Vaidya, and D.K. Pradhan, Improving Performance of TCP over Wireless Networks, Proc. 17th Int l Conf. Distributed Computing Systems (ICDCS), May [3] M. Gerla, K.Tang, and R. Bagrodia, TCP Performance in Wireless Multi Hop Networks, Proc. IEEE Workshop Mobile Computing Systems and Applications, Feb [4] G. Holland and N.H. Vaidya, Analysis of TCP Performance over Mobile Ad Hoc Networks, Proc. ACM MOBICOM Conf., pp , Aug [5] J.P. Monks, P. Sinha, and V. Bharghavan, Limitations of TCP ELFN for Ad Hoc Networks, Proc. Workshop Mobile and Multimedia Comm., Oct [6] T.D. Dyer and R. Bopanna, A Comparison of TCP Performance over Three Routing Protocols for Mobile Ad Hoc Networks, Proc. ACM MOBIHOC 2001 Conf., Oct [7] /Sami Iren and Paul D Amer, The Transport Layer tutorial and survey ACM computing survey, vol 31, No. 4, December , IJARCSSE All Rights Reserved Page 875

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Global Journal of Computer Science and Technology: E Network, Web & Security Volume 14 Issue 3 Version 1.0 Year 2014 Type: Double Blind Peer Reviewed International Research Journal Publisher: Global Journals

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An Empirical Approach - Distributed Mobility Management for Target Tracking in MANETs G.Michael Assistant Professor, Department of CSE, Bharath University, Chennai, TN, India ABSTRACT: Mobility management

### II RELATED PROTOCOLS. Dynamic Source Routing (DSR)

ENERGY AWEAR LOAD BALANCING IN MOBILE AD HOC NETWORK Prof. Uma Nagaraj Computer Engineering Maharashtra Academy of Engg. Alandi (D) Pune, India Shwetal Patil (Student) Computer Engineering Maharashtra

### Lecture 15: Congestion Control. CSE 123: Computer Networks Stefan Savage

Lecture 15: Congestion Control CSE 123: Computer Networks Stefan Savage Overview Yesterday: TCP & UDP overview Connection setup Flow control: resource exhaustion at end node Today: Congestion control Resource

### Data Networks Summer 2007 Homework #3

Data Networks Summer Homework # Assigned June 8, Due June in class Name: Email: Student ID: Problem Total Points Problem ( points) Host A is transferring a file of size L to host B using a TCP connection.

### An Implementation of Secure Wireless Network for Avoiding Black hole Attack

An Implementation of Secure Wireless Network for Avoiding Black hole Attack Neelima Gupta Research Scholar, Department of Computer Science and Engineering Jagadguru Dattaray College of Technology Indore,

### On Setting TCP s Congestion Window Limit in Mobile Ad Hoc Networks

On Setting TCP s Congestion Window Limit in Mobile Ad Hoc Networks Kai Chen, Yuan Xue, Klara Nahrstedt Computer Science Department University of Illinois at Urbana-Champaign Urbana, IL 181, U.S.A. Email:

### Comparative Study of Performance Evaluation for Mobile Ad hoc networks using a proxy node

Comparative Study of Performance Evaluation for Mobile Ad hoc networks using a proxy node G. E. RIZOS georizos@teiep.gr D. C. VASILIADIS dvas@teiep.gr E. STERGIOU ster@teiep.gr Abstract: In this paper,

### Efficient Load Balancing Routing in Wireless Mesh Networks

ISSN (e): 2250 3005 Vol, 04 Issue, 12 December 2014 International Journal of Computational Engineering Research (IJCER) Efficient Load Balancing Routing in Wireless Mesh Networks S.Irfan Lecturer, Dept

### Performance improvement of TCP over wireless network

Performance improvement of TCP over wireless network Raja singh Computer science Department, SRIT, Jabalpur, M.P.India, rajasinghpatel@gmail.com Brajesh patel Asst. Prof. SRIT,Jabalpur M.P., India, Abstract:

### Adaptive Multiple Metrics Routing Protocols for Heterogeneous Multi-Hop Wireless Networks

Adaptive Multiple Metrics Routing Protocols for Heterogeneous Multi-Hop Wireless Networks Lijuan Cao Kashif Sharif Yu Wang Teresa Dahlberg Department of Computer Science, University of North Carolina at

A Link-state QoS Routing Protocol for Ad Hoc Networks Anelise Munaretto 1 Hakim Badis 2 Khaldoun Al Agha 2 Guy Pujolle 1 1 LIP6 Laboratory, University of Paris VI, 8, rue du Capitaine Scott, 75015, Paris,

### An enhanced TCP mechanism Fast-TCP in IP networks with wireless links

Wireless Networks 6 (2000) 375 379 375 An enhanced TCP mechanism Fast-TCP in IP networks with wireless links Jian Ma a, Jussi Ruutu b and Jing Wu c a Nokia China R&D Center, No. 10, He Ping Li Dong Jie,

### THE Internet provides a convenient and cost-effective

522 IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS, VOL. 18, NO. 4, APRIL 2007 An Overview of Packet Reordering in Transmission Control Protocol (TCP): Problems, Solutions, and Challenges Ka-Cheong

### Dynamic Congestion-Based Load Balanced Routing in Optical Burst-Switched Networks

Dynamic Congestion-Based Load Balanced Routing in Optical Burst-Switched Networks Guru P.V. Thodime, Vinod M. Vokkarane, and Jason P. Jue The University of Texas at Dallas, Richardson, TX 75083-0688 vgt015000,

### QoS issues in Voice over IP

COMP9333 Advance Computer Networks Mini Conference QoS issues in Voice over IP Student ID: 3058224 Student ID: 3043237 Student ID: 3036281 Student ID: 3025715 QoS issues in Voice over IP Abstract: This