Route Re-establishment Research Articles

A Node Monitoring Agent based Handover Mechanism for Effective Communication in Cloud-Assisted MANETs in 5G

As nodes often join or leave the network, the communication between the cloud and the MANET remains unreliable in Cloud-Assisted MANET. The event of connection failure in MANET presents several challenges to the network, in particular, the handover issue and high energy consumption during route re-establishment if a connection fails in D2D (device-to-device) communication networks. To address this problem of D2D mobile communication in 5G, we propose a Node Monitoring Agent Based Handover Mechanism (NMABHM). To improve the network's efficiency, we use the K-means algorithm for clustering and cluster head selection in Hybrid MANET and maintain a backup routing table based on a Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) to quickly recover the route. Additionally, a Node Monitoring Agent (NMA) is introduced to handle the handover issue if a node comes out of range during the communication phase. The NMABHM-based handover mechanism is proposed with group mobility over a cluster-based architecture involving agents. The results of the simulation indicate that, in terms of lower energy consumption and higher throughput, our proposed mechanism is more effective than the current routing mechanisms.

Improving TCP Performance over Mobile Ad Hoc Networks with an Adaptive Backoff and Response approach (Dept.E)

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Range Adjustable Hybrid Multi Path Routing Algorithm for WSNs

Node disjoint multipath routing is an effective way to achieve reliability and load balancing in wireless sensor networks (WSNs). In this paper, an attempt has been made in proposing a novel node disjoint multipath routing algorithm, the range adjustable hybrid multipath (RAHM). RAHM uses hybrid routing approach. The centralised node disjoint path selection is based on the objective of minimising the end to end communication drain on each path. The localised distributed route reconfiguration initiates on the node failure events and the route re-establishment is based on the objective of residual energy of the nodes. The performance of the proposed algorithm is validated through simulations and compared with collection tree protocol (CTP) and multipath ring routing protocol. RAHM performs around 36% and 76% better in terms of network lifetime parameter compared to CTP and multipath ring routing protocol respectively.

A Study on Improving the Performance of TCP and Various Design Issues in Manets

Objective: To improve the performance of Transmission Control Protocol (TCP)by reducing packet loss, transmission errors, Round Trip Delay Time, optimizing the buffer size and using the energy efficient routing protocol. Methods: To achieve good performance, a feedback scheme is proposed which is called Feedback based TCP or TCP-F, so that the source can distinguish between Route Failure Notification (RFN) packet, allowing it to freeze its timers and stop sending packets. When the route is re-established, the source is informed through a Route Re-establishment Notification (RRN) packet, upon which it resumes by unfreezing timers and continuing packet transmissions. Findings: The performance of TCP on ad-hoc networks without and with feedback will be compared. The network performance will be determined in terms of throughput, time delay and routing overheads for different number of nodes. Improvements: It is assumed that in the event of route failures, as the route re-establishment time increases, the use of feedback provides significant gains in throughput as well as savings in unnecessary packet transmissions.

이동성 모델에 따른 다중경로 소스 라우팅 프로토콜의 성능평가

A variety of routing protocols targeted specifically at mobile ad-hoc network environments have been developed. Mobile ad-hoc network is a self-organizing temporary network, operating without the aid of any established wired infrastructure. The proposed protocol supports seamless communication services between the mobile hosts within a mobile ad-hoc network environments. In particular, our protocol makes faster route re-establishment possible by maintaining multiple paths in each mobile host, and also, the protocol provides reliable communication environments. We compare the performance of RWP model with that of LW model. This paper shows delivery ratio with single path and non-disjoint multiple path according to mobility model and node numbers.

A Dynamic Alternate Path QoS Enabled Routing Scheme in Mobile Ad hoc Networks

A mobile ad hoc network (MANET) is a collection of self-organized mobile nodes that are capable of communicating with each other without the aid of any established infrastructure or centralized administration. Routing algorithm has been a challenge task in the wireless ad hoc network for a long time due to the dynamic nature of network topology. A recent trend in ad hoc network routing is the reactive on-demand philosophy where routes are established only when required. The on-demand routing protocol for ad hoc network is appealing because of its low routing overhead and its effectiveness when the frequency of route re-establishment and the demand of route queries are not high. However, considering the increasing demand of Quality-of-Service (QoS) requirements in many applications, the current on-demand routing protocols used for ad-hoc network should be adapted appropriately to effectively meet the stringent QoS requirements of specific multimedia traffic. We thus propose a routing protocol which tries its best to satisfy QoS requirements of specific multimedia traffic in the volatile environments of a MANET. The results of a series of simulations exhibit the practicability and feasibility of our approaches.

무선 이동 애드-혹 네트워크를 위한 다중 경로 소스 라우팅 프로토콜과 Mobile-IP의 연동 기법

현재 홈 네트워크, 센서 네트워크, 유비쿼터스 네트워크 등에 대한 활발한 연구가 진행되면서 무선 이동 애드-흑 네트워크에 대한 관심이 높아지고 있다. 무선 이동 애드-혹 네트워크란 기존의 유선 하부구조의 도움 없이 이동 호스트들만으로 구성되는 임시적인 네트워크로, 언제어디서나 컴퓨팅 환경을 이용할 수 있도록 하는 개념의 유비쿼터스 컴퓨팅 환경에 적합한 네트워크이다. 본 논문에서는 다중 소스 라우팅 프로토콜 기반의 무선 이동 애드-혹 네트워크 환경과 Mobile-IP 기반의 네트워크 환경을 연동하는 기법에 대해 제안하고자 한다. 본 논문에서 제안하는 기법은 무선 이동 애드-혹 네트워크 내의 이동 호스트와 기지국간 다중 경로를 유지함으로써 경로 단절시 경로 재설정 및 재등록으로 인한 오버헤드를 줄이며 무선 이동 애드-혹 네트워크 내의 패킷을 Mobile-IP 패킷으로 변환하는 기능을 기지국에서 수행하도록 함으로써 이동호스트들의 오버헤드를 감소시키는 기법이다. 성능 평가를 통해, 본 논문에서 제안하는 기법이 단일 경로를 사용하는 일반적인 연동 기법들보다 이동 속도 증가에 따른 처리량 및 단대단 지연이 보다 안정적이며, 노드/링크가 전혀 중복되지 않는 다중 경로를 사용하는 기법에 비해 낮은 오버헤드를 가짐을 보인다. As the research on home network technologies, sensor network technologies, and ubiquitous network technologies makes rapid progresses, wireless ad-hoc network have attracted a lot of attention. A wireless ad-hoc network is a temporary network formed by a collection of wireless mobile nodes without the aid of my existing network infrastructure or centralized administration, and it is suitable for ubiquitous computing environments. In this paper, we suggest an interconnection scheme between the wireless ad-hoc network environment based on multiple path source routing protocol and a Mobile-IP based network environment. This scheme reduces the overhead of route re-establishment and re-registration by maintaining multiple paths between the mobile host in wireless ad-hoc network and the base station in mobile-IP network. Also it puts the base station in charge of function that performs translation between wireless ad-hoc network packets and Mobile-IP packets, reducing the load of mobile hosts. In this paper, our simulations show that our scheme outperforms existing interconnecting schemes with regards to throughput and end-to-end delay Also we show that our scheme outperforms multi-paths approach using disjoint routes with regards to routing overhead.

Fast Handover Based on Mobile IPv6 for Wireless LAN

Mobile networking technology is progressing to support the requirements of today's new class of Internet users who roam about with sophisticated mobile computers and digital wireless data communication devices. Host mobility requires change in the routing protocol so that packets for a moving host can be delivered to their correct destination. Mobile IP (Internet Protocol) allows a mobile node to send and receive packets with its home IP address, regardless of the IP address of its current point of attachment in the Internet. Since Mobile IP induces the handover latency due to mobility management operations, fast handover algorithms have been studied to reduce the latency. Normal and fast handover procedures for Wireless LAN are introduced and compared each other. We propose an overall procedure that manages the layer 2 (L2: link layer) and layer 3 (L3: network layer) handovers simultaneously. Two types of the L2 triggers in Wireless LAN system are introduced: pre-handover-trigger and link-state-trigger. Two criteria are defined to analyze the performance of the triggers: handover timeliness and handover accuracy. The fast handover reduces route reestablishment delay by 80~90% and total handover delay by 20~25% compared to the normal handover.

A feedback-based scheme for improving TCP performance in ad hoc wireless networks

Ad hoc networks are completely wireless networks of mobile hosts, in which the topology rapidly changes due to the movement of mobile hosts. This frequent topology change may lead to sudden packet losses and delays. Transport protocols like TCP, which have been designed for reliable fixed networks, misinterpret this packet loss as congestion and invoke congestion control, leading to unnecessary retransmissions and loss of throughput. To overcome this problem, a feedback scheme is proposed so that the source can distinguish between a route failure and network congestion. When a route is disrupted, the source is sent a route failure notification packet, allowing it to invalidate its timers and stop sending packets. When the route is reestablished, the source is informed through a route reestablishment notification packet, upon which it resumes packet transmissions. Simulation experiments show that in the event of route failures, as the route reestablishment time increases, the use of feedback provides significant improvements in performance.