Mobile & Wireless Networking. Lecture 10: Mobile Transport Layer & Ad Hoc Networks. [Schiller, Section 8.3 & Section 9] [Reader, Part 8]
|
|
- Gerard Roberts
- 5 years ago
- Views:
Transcription
1 Mobile & Wireless Networking Lecture 10: Mobile Transport Layer & Ad Hoc Networks [Schiller, Section 8.3 & Section 9] [Reader, Part 8] Geert Heijenk
2 Outline of Lecture 10 Mobile transport layer Motivation Approaches for improvement Indirect TCP Snooping TCP Mobile TCP Selective retransmission Recommended TCP improvements Ad hoc networks Concept Addressing and forwarding in ad-hoc networks Routing in ad-hoc networks Problem description DSDV (Destination Sequenced Distance Vector) Ad-hoc On-demand Distance Vector (AODV) DSR (Dynamic Source Routing) Further alternatives 2
3 Motivation I Transport protocols typically designed for Fixed end-systems Fixed, wired networks TCP congestion control packet loss in fixed networks typically due to (temporary) overload situations router have to discard packets as soon as the buffers are full TCP recognizes congestion only indirect via missing acknowledgements, retransmissions unwise, they would only contribute to the congestion and make it even worse slow-start algorithm as reaction 3
4 Motivation II TCP slow-start algorithm sender calculates a congestion window for a receiver start with a congestion window size equal to one segment exponential increase of the congestion window up to the congestion threshold, then linear increase missing acknowledgement causes the reduction of the congestion threshold to one half of the current congestion window congestion window starts again with one segment TCP fast retransmit/fast recovery TCP sends an acknowledgement only after receiving a packet if a sender receives several acknowledgements for the same packet, this is due to a gap in received packets at the receiver however, the receiver got all packets up to the gap and is actually receiving packets therefore, packet loss is not due to severe congestion, continue with (half of) current congestion window (do not use slow-start) 4
5 Influences of mobility on TCP-mechanisms TCP assumes congestion if packets are dropped typically wrong in wireless networks, here we often have packet loss due to transmission errors furthermore, mobility itself can cause packet loss, if e.g. a mobile node moves from one access point (e.g. foreign agent in Mobile IP) to another while there are still packets in transit and forwarding is not possible Additional problem: it takes a long time to increase the congestion window if the latency of the wireless link is high The performance of an unchanged TCP degrades severely but TCP cannot be changed due to the large base of installation in the fixed network (end-to-end protocol) therefore TCP for mobility has to remain compatible 5
6 Solutions: Indirect TCP / Performance Enhancing Proxy (RFC 3135) Indirect TCP or I-TCP segments the connection no changes to the TCP protocol for hosts connected to the wired Internet, millions of computers use (variants of) this protocol optimized TCP protocol for mobile hosts splitting of the TCP connection at, e.g., the foreign agent into 2 TCP connections, no real end-to-end connection any longer hosts in the fixed part of the net do not notice the characteristics of the wireless part mobile host performance enhancing proxy: access point / foreign agent wired Internet wireless TCP standard TCP 6
7 I-TCP socket and state migration Socket contains current TCP connection information (seq.num, ports) During handover, current AP buffers packets Since these packets have been acknowledged, they must be forwarded to new AP after handover is executed Fixed-side connection must be maintained (socket) access point 1 socket migration and state transfer Internet mobile host access point 2 7
8 Indirect TCP III Advantages no changes in the fixed network necessary, no changes for the hosts (TCP protocol) necessary, all current optimizations to TCP still work transmission errors on the wireless link do not propagate into the fixed network simple to control, mobile TCP is used only for one hop between, e.g., a foreign agent and mobile host therefore, a very fast retransmission of packets is possible, the delay on the mobile hop is known Disadvantages loss of end-to-end semantics, an acknowledgement to a sender does now not any longer mean that a receiver really got a packet, foreign agents might crash higher latency possible due to buffering of data within the foreign agent and forwarding to a new foreign agent 8
9 Solutions: Snooping TCP I Transparent extension of TCP within the foreign agent buffering of packets sent to the mobile host lost packets on the wireless link (both directions!) will be retransmitted immediately by the mobile host or foreign agent, respectively (so called local retransmission) the foreign agent therefore snoops the packet flow and recognizes acknowledgements in both directions, it also filters ACKs changes of TCP only within the foreign agent local retransmission foreign agent correspondent host wired Internet mobile host snooping of ACKs buffering of data end-to-end TCP connection 9
10 Snooping TCP II Data transfer to the mobile host FA buffers data until it receives ACK of the MH, FA detects packet loss via duplicated ACKs or time-out fast retransmission possible, transparent for the fixed network Data transfer from the mobile host FA detects packet loss on the wireless link via sequence numbers, FA answers directly with a NACK to the MH MH can now retransmit data with only a very short delay Integration of the MAC layer MAC layer often has similar mechanisms to those of TCP thus, the MAC layer can already detect duplicated packets due to retransmissions and discard them Problems snooping TCP does not isolate the wireless link as good as I-TCP snooping might be useless depending on encryption schemes 10
11 Solutions: Mobile TCP Special handling of lengthy and/or frequent disconnections M-TCP splits as I-TCP does unmodified TCP fixed network to supervisory host (SH) optimized TCP SH to MH Supervisory host no caching, no retransmission monitors all packets, if disconnection detected set sender window size to 0 sender automatically goes into persistent mode old or new SH reopen the window Advantages maintains semantics, supports disconnection, no buffer forwarding Disadvantages loss on wireless link propagated into fixed network adapted TCP on wireless link 11
12 Selective retransmission TCP acknowledgements are often cumulative ACK n acknowledges correct and in-sequence receipt of packets up to n if single packets are missing quite often a whole packet sequence beginning at the gap has to be retransmitted (go-back-n), thus wasting bandwidth Selective retransmission as one solution RFC2018 allows for acknowledgements of single packets, not only acknowledgements of in-sequence packet streams without gaps sender can now retransmit only the missing packets Advantage much higher efficiency Disadvantage more complex software in a receiver, more buffer needed at the receiver 12
13 Recommended TCP Improvements (RFC 3481) Appropriate Window Size (Sender & Receiver) Increased Initial Window (Sender) Limited Transmit (Sender) IP MTU Larger than Default Path MTU Discovery (Sender & Intermediate Routers) Selective Acknowledgments (Sender & Receiver) Explicit Congestion Notification (Sender, Receiver & Intermediate Routers) TCP Timestamps Option (Sender & Receiver) Disabling RFC 1144 TCP/IP Header Compression (Wireless Host) (RObust Header Compression, ROHC, RFC3095, is OK) 13
14 Outline of Lecture 10 Mobile transport layer Motivation Approaches for improvement Indirect TCP Snooping TCP Mobile TCP Selective retransmission Recommended TCP improvements Ad hoc networks Concept Addressing and forwarding in ad-hoc networks Routing in ad-hoc networks Problem description DSDV (Destination Sequenced Distance Vector) Ad-hoc On-demand Distance Vector (AODV) DSR (Dynamic Source Routing) Further alternatives 14
15 Ad hoc network concept Networks of wireless terminals that do not necessarily rely on existing infrastructure Although interworking with infrastructure is possible Direct communication between terminals when needed Multi-hop communication Extended concept of mobility: network mobility (moving routers) 15
16 Mobile ad hoc networks Standard Mobile IP needs an infrastructure Home Agent/Foreign Agent in the fixed network DNS, routing etc. are not designed for mobility Sometimes there is no infrastructure! remote areas, ad-hoc meetings, disaster areas cost can also be an argument against an infrastructure! Main topic: routing no default router available every node should be able to forward A B C 16
17 Addressing & forwarding in ad-hoc networks Broadcast (single hop) Beaconing Broadcast (multihop) Geocast Unicast 17
18 Beaconing Beaconing: periodic single-hop broadcast Problems: risk of overload no feedback from medium because of broadcast Solutions: adapt load to number of users, e.g., inter-beacon time / power control 18
19 Broadcast (multihop) Broadcast (multihop) Forwarding approach: flooding: all nodes forward all newly received messages Problems: broadcast storm: redundant transmissions synchronization of transmissions no acks, no feedback from medium Solutions: (random) delay before rebroadcasting, not all nodes rebroadcast e.g., distance-based forwarding 19
20 Geocast Geocast: like broadcast, but packet is only forwarded to certain geographic region Forwarding approach flooding to and in region routing to region + flooding in region Problems: trade-off between accuracy and efficiency 20
21 Unicast Unicast: single destination with known address Forwarding approach based on routing information 21
22 Outline of Lecture 10 Mobile transport layer Motivation Approaches for improvement Indirect TCP Snooping TCP Mobile TCP Selective retransmission Recommended TCP improvements Ad hoc networks Concept Addressing and forwarding in ad-hoc networks Routing in ad-hoc networks Problem description DSDV (Destination Sequenced Distance Vector) Ad-hoc On-demand Distance Vector (AODV) DSR (Dynamic Source Routing) Further alternatives 22
23 Routing examples Routing is a major topic in principle, every node should be able to forward dynamic topology asymmetric links redundant links: too many links when terminals are close N 1 N 1 N 2 N 3 N 3 N 2 N 4 N 5 N 4 N 5 time = t good link 1 time = t 2 weak link 23
24 Traditional routing algorithms Distance Vector periodic exchange of messages with all physical neighbors that contain information about who can be reached at what distance (monodirectional) selection of the shortest path if several paths available Link State periodic notification of all routers about the current state of all physical links (bidirectional) router get a complete picture of the network 24
25 Problems of traditional routing algorithms Dynamic of the topology frequent changes of connections, connection quality, participants Limited performance of mobile systems periodic updates of routing tables need energy without contributing to the transmission of user data, sleep modes difficult to realize limited bandwidth of the system is reduced even more due to the exchange of routing information links can be asymmetric, i.e., they can have a direction dependent transmission quality Problem protocols have been designed for fixed networks with infrequent changes and typically assume symmetric links 25
26 Ad hoc routing algorithms Pro-active Example: Destination Sequenced Distance Vector (DSDV) Re-active Example: Ad-hoc On-demand Distance Vector (AODV) Dynamic Source Routing (DSR) 26
27 DSDV (Destination Sequenced Distance Vector) Extension of distance vector routing Sequence numbers for all routing updates assures in-order execution of all updates avoids loops and inconsistencies Decrease of update frequency store time between first and best announcement of a path inhibit update if it seems to be unstable (based on the stored time values) See [Schiller] for details 27
28 Ad-hoc On-demand Distance Vector (AODV) Specified in IETF: RFC 3561 Forms the basis for DYMO (Dynamic On-demand MANET routing protocol) which is a planned IETF reactive routing protocol. Uses destination sequence numbers to avoid loops, and ensure proper updating of routes Storage of routes in Route Table Uses only symmetric links 28
29 Route Discovery Source broadcasts Route Request (RREQ): <Source_Addr, Source_Seq#, Broadcast_ID, Dest_Addr, Dest_Seq#, Hop_Count> A node can reply to the RREQ if It is the destination It has a fresh enough route to the destination Otherwise it rebroadcasts the RREQ Nodes keep track of <Source_Addr, Broadcast_ID> and discard redundant broadcasts Source Destination Route Request Propagation Source: Perkins & Royer 29
30 Reverse Path Setup Nodes update their Route Table with source node information before forwarding RREQ Reverse path entry used to forward Route Reply (RREP) back to source if one is received Expiration time is long enough for a RREP to be received and forwarded h Source Destination Reverse Path Formation 30
31 Forward Path Setup Destination, or intermediate node with current route to destination, unicasts Route Reply (RREP) back to source: <Source_Addr, Dest_Addr, Dest_Seq#, Hop_Count, Lifetime> Nodes along path record forward route in Route Table, use reverse route to forward RREP Source can begin sending data when it receives first RREP If it later receives a RREP with better metric, it updates its route entry Source Destination Forward Path Formation 31
32 Route Table Fields: Destination IP Address mber Destination Sequence Number HopCount Next Hop IP Address Active Neighbors Expiration time Source A Source Active Upstream Neighbors Next Hop Each time a route entry is used to transmit data, the expiration time is updated to current time + active_route_timeout Route entries may be updated if a route with greater sequence number or smaller hopcount is discovered Destination 32
33 Path Maintenance Movement of nodes not along active path does not trigger protocol action If source node moves, it can reinitiate route discovery When destination or intermediate node moves, node upstream of break sends unsolicited RREP to all active upstream neighbors metric, incremented Seq# Used to flush stale routes RREP is propagated to their active neighbors, and so on back to source Source can reinitiate route discovery if route is still needed RREQs for reinitiated route discovery contain destination sequence number of one greater than last known number 33
34 Path Maintenance (example) Source The Initial Route Destination Destination Source 4 4 After Route Reconstruction Node 3 moves to new location 3 Node 3 moves to new location 3 Node 2 notices loss of link, sends link failure to Node 1 Node 2 notices loss of link, sends link failure to Node 1 Node1 forwards link failure to Source Source reinitiates route discovery, finds new route through Node 4 Node 1 forwards link failure to Source Source reinitiates route discovery, finds new route 34 throu Node 4
35 Local Connectivity Management Node must periodically hear from active neighbors to know they are still within range Eavesdrop on neighbor transmissions If no other transmissions within hello_interval, broadcast Hello packet Failure to hear from a neighbor for (1+ allowed_hello_loss) * hello_interval indicates loss of link 35
36 Optimizations Expanding Ring Search by limiting TTL at first attempt, and increasing it at successive attempts. RREP generated by intermediate node only if Seq# for route to destination Dest_Seq# of RREQ Maintaining Local Connectivity by means of layer 2 info. Local Repair node upstream of link failure tries to find a new route to destination by sending a RREQ (with reduced TTL, and incremented Dest_Seq#) 36
37 DSR (Dynamic Source Routing) Similar to AODV Big difference: DSR uses Source Routing AODV relies on storing routing table entries in intermediate nodes RREQ and RREP carry addresses of all intermediate nodes See [Schiller] for details 37
38 A plethora of ad hoc routing protocols Flat proactive DSDV Destination Sequenced Distance Vector FSLS Fuzzy Sighted Link State FSR Fisheye State Routing OLSR Optimised Link State Routing Protocol TBRPF Topology Broadcast Based on Reverse Path Forwarding reactive DSR Dynamic Source Routing AODV Ad hoc On demand Distance Vector Hierarchical CGSR Clusterhead-Gateway Switch Routing HSR Hierarchical State Routing LANMAR Landmark Ad Hoc Routing ZRP Zone Routing Protocol Geographic position assisted DREAM Distance Routing Effect Algorithm for Mobility GeoCast Geographic Addressing and Routing GPSR Greedy Perimeter Stateless Routing LAR Location-Aided Routing 38
Mobile Transport Layer
Mobile Transport Layer 1 Transport Layer HTTP (used by web services) typically uses TCP Reliable transport between TCP client and server required - Stream oriented, not transaction oriented - Network friendly:
More informationOutline 9.2. TCP for 2.5G/3G wireless
Transport layer 9.1 Outline Motivation, TCP-mechanisms Classical approaches (Indirect TCP, Snooping TCP, Mobile TCP) PEPs in general Additional optimizations (Fast retransmit/recovery, Transmission freezing,
More informationChapter 13 TRANSPORT. Mobile Computing Winter 2005 / Overview. TCP Overview. TCP slow-start. Motivation Simple analysis Various TCP mechanisms
Overview Chapter 13 TRANSPORT Motivation Simple analysis Various TCP mechanisms Distributed Computing Group Mobile Computing Winter 2005 / 2006 Distributed Computing Group MOBILE COMPUTING R. Wattenhofer
More informationCSE 4215/5431: Mobile Communications Winter Suprakash Datta
CSE 4215/5431: Mobile Communications Winter 2013 Suprakash Datta datta@cse.yorku.ca Office: CSEB 3043 Phone: 416-736-2100 ext 77875 Course page: http://www.cse.yorku.ca/course/4215 Some slides are adapted
More informationMobile Communications Chapter 9: Mobile Transport Layer
Prof. Dr.-Ing Jochen H. Schiller Inst. of Computer Science Freie Universität Berlin Germany Mobile Communications Chapter 9: Mobile Transport Layer Motivation, TCP-mechanisms Classical approaches (Indirect
More informationMobile Communications Chapter 9: Mobile Transport Layer
Prof. Dr.-Ing Jochen H. Schiller Inst. of Computer Science Freie Universität Berlin Germany Mobile Communications Chapter 9: Mobile Transport Layer Motivation, TCP-mechanisms Classical approaches (Indirect
More informationMobile Transport Layer
Mobile Transport Layer 1 Transport Layer E.g. HTTP (used by web services) typically uses TCP Reliable transport between client and server required TCP Stream oriented Network friendly: time-out congestion
More informationMobile IP and Mobile Transport Protocols
Mobile IP and Mobile Transport Protocols 1 IP routing Preliminaries Works on a hop-by-hop basis using a routing table 32 bits: 129.97.92.42 Address = subnet + host (Mobility No packet for you) Two parts»
More informationLECTURE 9. Ad hoc Networks and Routing
1 LECTURE 9 Ad hoc Networks and Routing Ad hoc Networks 2 Ad Hoc Networks consist of peer to peer communicating nodes (possibly mobile) no infrastructure. Topology of the network changes dynamically links
More informationOutline. CS5984 Mobile Computing. Taxonomy of Routing Protocols AODV 1/2. Dr. Ayman Abdel-Hamid. Routing Protocols in MANETs Part I
CS5984 Mobile Computing Dr. Ayman Abdel-Hamid Computer Science Department Virginia Tech Part I Outline Routing Protocols for Ad hoc Networks Example of a reactive routing protocol AODV: Ad hoc On-demand
More informationContent. 1. Introduction. 2. The Ad-hoc On-Demand Distance Vector Algorithm. 3. Simulation and Results. 4. Future Work. 5.
Rahem Abri Content 1. Introduction 2. The Ad-hoc On-Demand Distance Vector Algorithm Path Discovery Reverse Path Setup Forward Path Setup Route Table Management Path Management Local Connectivity Management
More informationRouting in Ad Hoc Wireless Networks PROF. MICHAEL TSAI / DR. KATE LIN 2014/05/14
Routing in Ad Hoc Wireless Networks PROF. MICHAEL TSAI / DR. KATE LIN 2014/05/14 Routing Algorithms Link- State algorithm Each node maintains a view of the whole network topology Find the shortest path
More informationSupporting mobility only on lower layers up to the network layer is not
Mobile transport layer Supporting mobility only on lower layers up to the network layer is not enough to provide mobility support for applications. Most applications rely on a transport layer, such as
More informationMobile Communications Chapter 8: Routing Protocols
Mobile Communications Chapter 8: Routing Protocols Ad-hoc networks Routing protocols Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 8.1 Mobile ad hoc networks Standard Mobile IP
More informationAdvanced Computer Networks. Wireless TCP
Advanced Computer Networks 263 3501 00 Wireless TCP Patrick Stuedi Spring Semester 2014 1 Oriana Riva, Department of Computer Science ETH Zürich Outline Last week: Today: Cellular Networks Mobile IP Wireless
More informationECS-087: Mobile Computing
ECS-087: Mobile Computing Mobile Adhoc Networks and Routing in MANETS (most of the slides borrowed from Prof. Sridhar Iyer) Diwakar Yagyasen 1 Index Mobile Ad Hoc Networks (MANET) MAC in MANET MANET routing
More informationUnicast Routing in Mobile Ad Hoc Networks. Dr. Ashikur Rahman CSE 6811: Wireless Ad hoc Networks
Unicast Routing in Mobile Ad Hoc Networks 1 Routing problem 2 Responsibility of a routing protocol Determining an optimal way to find optimal routes Determining a feasible path to a destination based on
More informationMobile Ad-Hoc Networks & Routing Algorithms
Mobile Ad-Hoc Networks & Routing Algorithms EMMANOUIL G. SPANAKIS, PhD. spanakis@csd.uoc.gr COLLABORATING RESEARCHER, COMPUTATIONAL BIOMEDICINE LABORATORY, FORTH-ICS VISITING LECTURER, COMPUTER SCIENCE
More informationCMPE 257: Wireless and Mobile Networking
CMPE 257: Wireless and Mobile Networking Katia Obraczka Computer Engineering UCSC Baskin Engineering Lecture 6 CMPE 257 Winter'11 1 Announcements Project proposals. Student presentations. 10 students so
More informationTCP over Wireless PROF. MICHAEL TSAI 2016/6/3
TCP over Wireless PROF. MICHAEL TSAI 2016/6/3 2 TCP Congestion Control (TCP Tahoe) Only ACK correctly received packets Congestion Window Size: Maximum number of bytes that can be sent without receiving
More informationMobile Communications. Ad-hoc and Mesh Networks
Ad-hoc+mesh-net 1 Mobile Communications Ad-hoc and Mesh Networks Manuel P. Ricardo Faculdade de Engenharia da Universidade do Porto Ad-hoc+mesh-net 2 What is an ad-hoc network? What are differences between
More informationWireless TCP. TCP mechanism. Wireless Internet: TCP in Wireless. Wireless TCP: transport layer
Wireless TCP W.int.2-2 Wireless Internet: TCP in Wireless Module W.int.2 Mobile IP: layer, module W.int.1 Wireless TCP: layer Dr.M.Y.Wu@CSE Shanghai Jiaotong University Shanghai, China Dr.W.Shu@ECE University
More informationTRANSMISSION CONTROL PROTOCOL
COMP 635: WIRELESS & MOBILE COMMUNICATIONS TRANSMISSION CONTROL PROTOCOL Jasleen Kaur Fall 2017 1 Impact of Wireless on Protocol Layers Application layer Transport layer Network layer Data link layer Physical
More informationA COMPARISON OF REACTIVE ROUTING PROTOCOLS DSR, AODV AND TORA IN MANET
ISSN: 2278 1323 All Rights Reserved 2016 IJARCET 296 A COMPARISON OF REACTIVE ROUTING PROTOCOLS DSR, AODV AND TORA IN MANET Dr. R. Shanmugavadivu 1, B. Chitra 2 1 Assistant Professor, Department of Computer
More informationMobile Ad-hoc Networks. Computer Networks
Mobile Ad-hoc Networks Computer Networks Mobile ad hoc networks Standard Mobile IP needs an infrastructure Home Agent/Foreign Agent in the fixed network DNS, routing etc. are not designed for mobility
More informationLecture 13: Routing in multihop wireless networks. Mythili Vutukuru CS 653 Spring 2014 March 3, Monday
Lecture 13: Routing in multihop wireless networks Mythili Vutukuru CS 653 Spring 2014 March 3, Monday Routing in multihop networks Figure out a path from source to destination. Basic techniques of routing
More informationRouting protocols in Mobile Ad Hoc Network
Routing protocols in Mobile Ad Hoc Network Presented By :- Nitesh Jain Date:-26/10/2005 SCHOOL OF INFORMATION TECHNOLOGY INDIAN INSTITUTE OF TECHNOLOGY KHARAGPUR KHARAGPUR Types of Wireless Networks Infrastructure
More informationRouting Protocols in MANETs
Chapter 4 Routing Protocols in MANETs 4.1 Introduction The main aim of any Ad Hoc network routing protocol is to meet the challenges of the dynamically changing topology and establish a correct and an
More informationCHAPTER 2 LITERATURE REVIEW
39 CHAPTER 2 LITERATURE REVIEW This chapter gives a brief summary of the MANET routing protocol types and their details. 2.1 ROUTING IN AD-HOC NETWORKS Routing is the act of moving information from source
More informationChapter 6 MOBILE IP AND TCP
Chapter 6 MOBILE IP AND TCP Distributed Computing Group Mobile Computing Summer 2004 Overview Network Protocols / Mobile IP Motivation Data transfer Encapsulation Problems DHCP Mobile Transport Layer /
More informationKapitel 5: Mobile Ad Hoc Networks. Characteristics. Applications of Ad Hoc Networks. Wireless Communication. Wireless communication networks types
Kapitel 5: Mobile Ad Hoc Networks Mobilkommunikation 2 WS 08/09 Wireless Communication Wireless communication networks types Infrastructure-based networks Infrastructureless networks Ad hoc networks Prof.
More information2013, IJARCSSE All Rights Reserved Page 85
Volume 3, Issue 12, December 2013 ISSN: 2277 128X International Journal of Advanced Research in Computer Science and Software Engineering Research Paper Available online at: www.ijarcsse.com Overview of
More informationTRANSMISSION CONTROL PROTOCOL
COMP 635: WIRELESS NETWORKS TRANSMISSION CONTROL PROTOCOL Jasleen Kaur Fall 2015 1 Impact of Wireless on Protocol Layers Application layer Transport layer Network layer Data layer Physical layer service
More informationMobile Routing : Computer Networking. Overview. How to Handle Mobile Nodes? Mobile IP Ad-hoc network routing Assigned reading
Mobile Routing 15-744: Computer Networking L-10 Ad Hoc Networks Mobile IP Ad-hoc network routing Assigned reading Performance Comparison of Multi-Hop Wireless Ad Hoc Routing Protocols A High Throughput
More informationUCS-805 MOBILE COMPUTING Jan-May,2011 TOPIC 8. ALAK ROY. Assistant Professor Dept. of CSE NIT Agartala.
Mobile Ad Hoc Networks: Routing TOPIC 8 UCS-805 MOBILE COMPUTING Jan-May,2011 ALAK ROY. Assistant Professor Dept. of CSE NIT Agartala Email-alakroy.nerist@gmail.com Mobile Ad Hoc Networks (MANET) Introduction
More informationMobile Ad-hoc and Sensor Networks Lesson 04 Mobile Ad-hoc Network (MANET) Routing Algorithms Part 1
Mobile Ad-hoc and Sensor Networks Lesson 04 Mobile Ad-hoc Network (MANET) Routing Algorithms Part 1 Oxford University Press 2007. All rights reserved. 1 Ad-hoc networks deployment For routing, target detection,
More informationECS-087: Mobile Computing
ECS-087: Mobile Computing TCP over wireless TCP and mobility Most of the Slides borrowed from Prof. Sridhar Iyer s lecture IIT Bombay Diwakar Yagyasen 1 Effect of Mobility on Protocol Stack Application:
More informationLecture 16: Wireless Networks
&6( *UDGXDWH1HWZRUNLQJ :LQWHU Lecture 16: Wireless Networks Geoffrey M. Voelker :LUHOHVV1HWZRUNLQJ Many topics in wireless networking Transport optimizations, ad hoc routing, MAC algorithms, QoS, mobility,
More informationPerformance Evaluation of AODV and DSR routing protocols in MANET
Performance Evaluation of AODV and DSR routing protocols in MANET Naresh Dobhal Diwakar Mourya ABSTRACT MANETs are wireless temporary adhoc networks that are being setup with no prior infrastructure and
More information3. Evaluation of Selected Tree and Mesh based Routing Protocols
33 3. Evaluation of Selected Tree and Mesh based Routing Protocols 3.1 Introduction Construction of best possible multicast trees and maintaining the group connections in sequence is challenging even in
More informationAd Hoc Networks: Issues and Routing
Ad Hoc Networks: Issues and Routing Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu Audio/Video recordings of this lecture are available at: http://www.cse.wustl.edu/~jain/cse574-08/
More informationRedes Inalámbricas Tema 4. Mobile Ad Hoc Networks
Redes Inalámbricas Tema 4. Mobile Ad Hoc Networks A. Specific properties B. Flooding as a basic mechanism C. Basic routing protocols DSR AODV y DYMO OLSR y OLSRv2 D. Advanced protocols and techniques Acknowledgments
More informationRouting Protocols in MANET: Comparative Study
Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology IJCSMC, Vol. 3, Issue. 7, July 2014, pg.119
More informationMANET TECHNOLOGY. Keywords: MANET, Wireless Nodes, Ad-Hoc Network, Mobile Nodes, Routes Protocols.
MANET TECHNOLOGY Dharna 1, Varsha Saroha 2, R. B. Dubey 3 1,2,3 Department of Electronics and Communication Engineering, Hindu College of Engineering, Sonepat, Haryana,(India) ABSTRACT Wireless technology
More informationWireless Networking & Mobile Computing
Wireless Networking & Mobile Computing CS 752/852 - Spring 2012 Network Layer: Ad Hoc Routing Tamer Nadeem Dept. of Computer Science The OSI Communication Model Page 2 Spring 2012 CS 752/852 - Wireless
More informationMaharishi Markandeshwar University
RESEARCH ARTICLE OPEN ACCESS Simulation Based Performance Comparison of Adhoc Routing Protocols Kushagra Agrawal*, Shaveta Jain** *Department of Computer Science,, Mullana, Ambala agrawal_kushagra@rediffmail.com
More informationMobile Communications Chapter 8: Network Protocols/Mobile IP. Micro mobility support. Routing protocols. Ad-hoc networks. Problems DHCP.
Mobile Communications Chapter 8: Network Protocols/Mobile IP Motivation Problems Data transfer Micro mobility support Encapsulation DHCP Security Ad-hoc networks IPv6 Routing protocols Prof. Dr.-Ing. Jochen
More informationA Survey of Vehicular Ad hoc Networks Routing Protocols
International Journal of Innovation and Applied Studies ISSN 2028-9324 Vol. 3 No. 3 July 2013, pp. 829-846 2013 Innovative Space of Scientific Research Journals http://www.issr-journals.org/ijias/ A Survey
More informationUnicast Routing in Mobile Ad-Hoc Networks
Unicast Routing in Mobile Ad-Hoc Networks Overview Introduction MaNet Protocols Proactive & Hybrid Protocols WRP/GSR/FSR/LAR ZRP Reactive Protocols DSR/DSDV/AODV Challenges in Ad-Hoc Networks References
More informationA Comparative Study of Routing Protocols for Mobile Ad-Hoc Networks
Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology IJCSMC, Vol. 3, Issue. 11, November 2014,
More informationA REVERSE AND ENHANCED AODV ROUTING PROTOCOL FOR MANETS
A REVERSE AND ENHANCED AODV ROUTING PROTOCOL FOR MANETS M. Sanabani 1, R. Alsaqour 2 and S. Kurkushi 1 1 Faculty of Computer Science and Information Systems, Thamar University, Thamar, Republic of Yemen
More informationChapter 09 Network Protocols
Chapter 09 Network Protocols Copyright 2011, Dr. Dharma P. Agrawal and Dr. Qing-An Zeng. All rights reserved. 1 Outline Protocol: Set of defined rules to allow communication between entities Open Systems
More informationA Study on Routing Protocols for Mobile Adhoc Networks
A Study on Routing Protocols for Mobile Adhoc Networks R.Logambal 1, Dr.K.Chitra 2 Research Scholar, Dept of Computer Science, Bharathiar University, Coimbatore, India 1 Asst. Professor, Govt Arts College,
More informationChapter 12 Network Protocols
Chapter 12 Network Protocols 1 Outline Protocol: Set of defined rules to allow communication between entities Open Systems Interconnection (OSI) Transmission Control Protocol/Internetworking Protocol (TCP/IP)
More informationPolitecnico di Milano Facoltà di Ingegneria dell Informazione. WI-7 Ad hoc networks. Wireless Internet Prof. Antonio Capone
Politecnico di Milano Facoltà di Ingegneria dell Informazione WI-7 Ad hoc networks Wireless Internet Prof. Antonio Capone Acknowlegments o This class notes are mostly based on the teaching material of:
More informationREVIEW ON ROUTING PROTOCOLS FOR MOBILE AD HOC NETWORKS
REVIEW ON ROUTING PROTOCOLS FOR MOBILE AD HOC NETWORKS G. Poornima 1, Mr. M. Rajasenathipathi 2, 1 Research Scholar, Department of Computer Science, NGM College, Pollachi 2 Assistant Professor, Department
More informationChapter 16. Wireless LAN, Mobile Ad Hoc Networks, and MANET Routing Protocols. Wireless Network Models. Illustration of an ad hoc network
Chapter 16 Wireless LAN, Mobile Ad Hoc Networks, and MANET Routing Protocols Associate Prof. Yuh-Shyan Chen Department of CSIE National Chung Cheng University Wireless Network Models With Infrastructure:
More informationWireless LAN, Mobile Ad Hoc Networks, and MANET Routing Protocols
Chapter 16 Wireless LAN, Mobile Ad Hoc Networks, and MANET Routing Protocols Associate Prof. Yuh-Shyan Chen Department of CSIE National Chung Cheng University 2002/11/ Yuh-Shyan Chen 1 Wireless Network
More informationWhite Paper. Mobile Ad hoc Networking (MANET) with AODV. Revision 1.0
White Paper Mobile Ad hoc Networking (MANET) with AODV Revision 1.0 This page is intentionally blank, or rather nearly blank. Table of Contents TABLE OF CONTENTS...3 TABLE OF FIGURES...4 WHAT IS MANET?...5
More informationCS551 Ad-hoc Routing
CS551 Ad-hoc Routing Bill Cheng http://merlot.usc.edu/cs551-f12 1 Mobile Routing Alternatives Why not just assume a base station? good for many cases, but not some (military, disaster recovery, sensor
More informationImproving Reliable Transport and Handoff Performance in Cellular Wireless Networks
Improving Reliable Transport and Handoff Performance in Cellular Wireless Networks H. Balakrishnan, S. Seshan, and R. H. Katz ACM Wireless Networks Vol. 1, No. 4, pp. 469-482 Dec. 1995 P. 1 Introduction
More informationMitigating Superfluous Flooding of Control Packets MANET
Mitigating Superfluous Flooding of Control Packets MANET B.Shanmugha Priya 1 PG Student, Department of Computer Science, Park College of Engineering and Technology, Kaniyur, Coimbatore, India 1 Abstract:
More informationA COMPARISON OF IMPROVED AODV ROUTING PROTOCOL BASED ON IEEE AND IEEE
Journal of Engineering Science and Technology Vol. 4, No. 2 (2009) 132-141 School of Engineering, Taylor s University College A COMPARISON OF IMPROVED AODV ROUTING PROTOCOL BASED ON IEEE 802.11 AND IEEE
More informationRouting Protocols in Mobile Ad-Hoc Network
International Journal of Computer Science & Management Studies, Vol. 12, Issue 02, April 2012 Protocols in Mobile Ad-Hoc Network Sachin Minocha M. Tech Student, Vaish College of Engineering, Rohtak, Haryana
More informationLOCATION-AIDED ROUTING PROTOCOL IN HYBRID WIRED-WIRELESS NETWORKS. WU MINTAO (B.Eng.(Hons.), NTU)
LOCATION-AIDED ROUTING PROTOCOL IN HYBRID WIRED-WIRELESS NETWORKS WU MINTAO (B.Eng.(Hons.), NTU) A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF ENGINEERING DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
More informationAd Hoc Routing Protocols and Issues
Ad Hoc Routing Protocols and Issues Stefano Basagni ECE Dept Northeastern University Boston, Jan 2003 Ad hoc (AD-HAHK or AD-HOKE)-Adjective a) Concerned with a particular end or purpose, and b) formed
More informationCMPE 257: Wireless and Mobile Networking
CMPE 257: Wireless and Mobile Networking Katia Obraczka Computer Engineering UCSC Baskin Engineering Lecture 10 CMPE 257 Spring'15 1 Student Presentations Schedule May 21: Sam and Anuj May 26: Larissa
More informationCIS 632 / EEC 687 Mobile Computing
CIS 632 / EEC 687 Mobile Computing TCP in Mobile Networks Prof. Chansu Yu Contents Physical layer issues Communication frequency Signal propagation Modulation and Demodulation Channel access issues Multiple
More informationArvind Krishnamurthy Fall 2003
Ad-hoc Routing Arvind Krishnamurthy Fall 2003 Ad Hoc Routing Create multi-hop connectivity among set of wireless, possibly moving, nodes Mobile, wireless hosts act as forwarding nodes as well as end systems
More informationEZR: Enhanced Zone Based Routing In Manet
EZR: Enhanced Zone Based Routing In Manet Bency Wilson 1, Geethu Bastian 2, Vinitha Ann Regi 3, Arun Soman 4 Department of Information Technology, Rajagiri School of Engineering and Technology, Rajagiri
More informationPerformance Analysis of MANET Routing Protocols OLSR and AODV
VOL. 2, NO. 3, SEPTEMBER 211 Performance Analysis of MANET Routing Protocols OLSR and AODV Jiri Hosek Faculty of Electrical Engineering and Communication, Brno University of Technology Email: hosek@feec.vutbr.cz
More informationAd Hoc Networks. Mobile Communication Networks (RCSE) Winter Semester 2012/13. Integrated Communication Systems Group Ilmenau University of Technology
Ad Hoc Networks Mobile Communication Networks (RCSE) Winter Semester 2012/13 Integrated Communication Systems Group Ilmenau University of Technology Outline Introduction Medium Access Control (MAC) Routing
More informationCS5984 Mobile Computing
CS5984 Mobile Computing Dr. Ayman Abdel-Hamid Computer Science Department Virginia Tech Part II 1 Outline Routing Protocols for Ad hoc Networks DSDV: Highly Dynamic Destination-Sequenced Distance- Vector
More informationAnalysis of Black-Hole Attack in MANET using AODV Routing Protocol
Analysis of Black-Hole Attack in MANET using Routing Protocol Ms Neha Choudhary Electronics and Communication Truba College of Engineering, Indore India Dr Sudhir Agrawal Electronics and Communication
More informationPower aware Multi-path Routing Protocol for MANETS
Power aware Multi-path Routing Protocol for MANETS Shruthi P Murali 1,Joby John 2 1 (ECE Dept, SNGCE, India) 2 (ECE Dept, SNGCE, India) Abstract: Mobile Adhoc Network consists of a large number of mobile
More informationCLASSIFICATION OF ROUTING Routing. Fig.1 Types of routing
Volume 5, Issue 5, MAY 2015 ISSN: 2277 128X International Journal of Advanced Research in Computer Science and Software Engineering Research Paper Available online at: www.ijarcsse.com A Survey on Unicast
More informationChapter 7 Routing Protocols for Ad Hoc Wireless Networks. Jang-Ping Sheu
Chapter 7 Routing Protocols for Ad Hoc Wireless Networks Jang-Ping Sheu Introduction Routing protocols used in wired networks cannot be directly applied to ad hoc wireless networks Highly dynamic topology
More informationMr. Pradip A. Chougule 1, Mr. Rajesh A. Sanadi 2, Mr. U. H.Kamble 3
IOSR Journal of Computer Engineering (IOSR-JCE) ISSN: 2278-0661, ISBN: 2278-8727, PP: 01-05 www.iosrjournals.org COMPARATIVE STUDY OF TABLE DRIVEN ROUTING PROTOCOLS IN AD HOC WIRELESS NETWORKS Mr. Pradip
More informationChapter-2 Routing Protocols of MANET
Chapter-2 Routing Protocols of MANET Chapter 2 Routing Protocols of MANET Routing is an important function for any network, whether it is for wired or wireless. The protocols designed for routing in these
More informationWireless Mesh Networks
Wireless Mesh Networks COS 463: Wireless Networks Lecture 6 Kyle Jamieson [Parts adapted from I. F. Akyildiz, B. Karp] Wireless Mesh Networks Describes wireless networks in which each node can communicate
More informationPerformance Evaluation of Various Routing Protocols in MANET
208 Performance Evaluation of Various Routing Protocols in MANET Jaya Jacob 1,V.Seethalakshmi 2 1 II MECS,Sri Shakthi Institute of Science and Technology, Coimbatore, India 2 Associate Professor-ECE, Sri
More informationAd Hoc Networks. Advanced Mobile Communication Networks. Integrated Communication Systems Group Ilmenau University of Technology
Ad Hoc Networks Advanced Mobile Communication Networks Integrated Communication Systems Group Ilmenau University of Technology Outline Introduction Medium Access Control (MAC) in Multi-Channel Scenario
More informationIntroduction to Mobile Ad hoc Networks (MANETs)
Introduction to Mobile Ad hoc Networks (MANETs) 1 Overview of Ad hoc Network Communication between various devices makes it possible to provide unique and innovative services. Although this inter-device
More informationA Review of Reactive, Proactive & Hybrid Routing Protocols for Mobile Ad Hoc Network
ShriRam College of Engineering & Management 1 A Review of Reactive, Proactive & Hybrid Routing Protocols for Mobile Ad Hoc Network M.Ramaiya Rohit Gupta Rachit Jain Head,Dept. Computer Science Dept. Computer
More informationSurvey of Adaptive On Demand Distance Vector Learning Protocol (AODV)
International Journal of Scientific and Research Publications, Volume 3, Issue 4, April 2013 1 Survey of Adaptive On Demand Distance Vector Learning Protocol (AODV) Sandeep Nandanwar, Vikram Jain, Sandeep
More informationCOMPARISON OF DSR PROTOCOL IN MOBILE AD-HOC NETWORK SIMULATED WITH OPNET 14.5 BY VARYING INTERNODE DISTANCE
COMPARISON OF DSR PROTOCOL IN MOBILE AD-HOC NETWORK SIMULATED WITH OPNET 14.5 BY VARYING INTERNODE DISTANCE Puneet Mittal 1, Paramjeet Singh 2 and Shaveta Rani 3 1 Dept. of Computer Engg. Govt. Poly. College,
More informationA Survey - Energy Efficient Routing Protocols in MANET
, pp. 163-168 http://dx.doi.org/10.14257/ijfgcn.2016.9.5.16 A Survey - Energy Efficient Routing Protocols in MANET Jyoti Upadhyaya and Nitin Manjhi Department of Computer Science, RGPV University Shriram
More informationSimulation & Performance Analysis of Mobile Ad-Hoc Network Routing Protocol
Simulation & Performance Analysis of Mobile Ad-Hoc Network Routing Protocol V.S.Chaudhari 1, Prof.P.N.Matte 2, Prof. V.P.Bhope 3 Department of E&TC, Raisoni College of Engineering, Ahmednagar Abstract:-
More informationBehaviour of Routing Protocols of Mobile Adhoc Netwok with Increasing Number of Groups using Group Mobility Model
Behaviour of Routing Protocols of Mobile Adhoc Netwok with Increasing Number of Groups using Group Mobility Model Deepak Agrawal, Brajesh Patel Department of CSE Shri Ram Institute of Technology Jabalpur,
More informationStudy and Comparison of Mesh and Tree- Based Multicast Routing Protocols for MANETs
Study and Comparison of Mesh and Tree- Based Multicast Routing Protocols for MANETs Rajneesh Gujral Associate Proffesor (CSE Deptt.) Maharishi Markandeshwar University, Mullana, Ambala Sanjeev Rana Associate
More informationCMPE 257: Wireless and Mobile Networking
CMPE 257: Wireless and Mobile Networking Katia Obraczka Computer Engineering UCSC Baskin Engineering Lecture 9 CMPE 257 Winter'10 1 Announcements Student presentations: March 8th: Daniel and Teddy March
More information6. Node Disjoint Split Multipath Protocol for Unified. Multicasting through Announcements (NDSM-PUMA)
103 6. Node Disjoint Split Multipath Protocol for Unified Multicasting through Announcements (NDSM-PUMA) 6.1 Introduction It has been demonstrated in chapter 3 that the performance evaluation of the PUMA
More informationPerformance analysis of aodv, dsdv and aomdv using wimax in NS-2
Performance analysis of aodv, dsdv and aomdv using wimax in NS-2 Madhusrhee B Department Computer Science, L.J Institute of Technology, Ahmedabad, India Abstract WiMAX (IEEE 802.16) technology empowers
More informationANALYSIS OF DIFFERENT REACTIVE, PROACTIVE & HYBRID ROUTING PROTOCOLS: A REVIEW
ANALYSIS OF DIFFERENT REACTIVE, PROACTIVE & HYBRID ROUTING PROTOCOLS: A REVIEW Kirandeep Kaur 1, Mr.Pawan Luthra 2, Er.Gagandeep 3 1 Department of Computer Science and Engineering, Shaheed Bhagat Singh
More informationMobile Communications Chapter 8: Network Protocols/Mobile IP
Mobile Communications Chapter 8: Network Protocols/Mobile IP Motivation Data transfer, Encapsulation Security, IPv6, Problems Micro mobility support DHCP Ad-hoc networks, Routing protocols 8.1 Motivation
More informationA Performance Comparison of Multi-Hop Wireless Ad Hoc Network Routing Protocols. Broch et al Presented by Brian Card
A Performance Comparison of Multi-Hop Wireless Ad Hoc Network Routing Protocols Broch et al Presented by Brian Card 1 Outline Introduction NS enhancements Protocols: DSDV TORA DRS AODV Evaluation Conclusions
More informationQoS Routing By Ad-Hoc on Demand Vector Routing Protocol for MANET
2011 International Conference on Information and Network Technology IPCSIT vol.4 (2011) (2011) IACSIT Press, Singapore QoS Routing By Ad-Hoc on Demand Vector Routing Protocol for MANET Ashwini V. Biradar
More informationExperiment and Evaluation of a Mobile Ad Hoc Network with AODV Routing Protocol
Experiment and Evaluation of a Mobile Ad Hoc Network with AODV Routing Protocol Kalyan Kalepu, Shiv Mehra and Chansu Yu, Department of Electrical and Computer Engineering Cleveland State University 2121
More informationPerformance Analysis and Enhancement of Routing Protocol in Manet
Vol.2, Issue.2, Mar-Apr 2012 pp-323-328 ISSN: 2249-6645 Performance Analysis and Enhancement of Routing Protocol in Manet Jaya Jacob*, V.Seethalakshmi** *II MECS, Sri Shakthi Institute of Engineering and
More informationInternational Journal of Scientific & Engineering Research, Volume 6, Issue 3, March ISSN
International Journal of Scientific & Engineering Research, Volume 6, Issue 3, March-2015 1464 Performance Evaluation of AODV and DSDV Routing Protocols through Clustering in MANETS Prof. A Rama Rao, M
More information