ISSN: 2277-9655 [Fatima * et al., 7(4): April, 2018] Impact Factor: 5.164 IC™ Value: 3.00 CODEN: IJESS7 http: // www.ijesrt.com© International Journal of Engineering Sciences & Research Technology [15] IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY AUTONOMOUSLY RECOVER FROM WIRELESS LINK FAILURE THROUGH "AUTONOMOUS NETWORK RECONFIGURATION SYSTEM (ARS)" WITH MULTI-RADIO IN WMN Prof. Syeda Faqera Fatima *1 , Prof. Asra Sarwath 2 & Prof. Zeenath Sultana 3 *1,2&3 Asst.Professor, Department of Computer, Science and Engineering, Khwaja Banda Nawaz, College of Engineering , Gulbarga, Karanataka DOI: 10.5281/zenodo.1212836 ABSTRACT This paper describes the technique to recover from the failures that occurs in Wireless Mesh networks(WMN) like node failure, link failures etc , due to channel interference, dynamic obstacles or application bandwidth demands. This paper present an Autonomous network Reconfiguration System (ARS) that enables a multi-radio WMN to autonomously recover from local link failures to preserve network performance. ARS has been implemented and evaluated extensively on our IEEE 802.11-based WMN test-bed as well as through ns-2-based simulation . By using channel and radio diversities in WMNs, ARS generates necessary changes in local radio and channel assignments in order to recover from failures. Next ARS’s on-line reconfigurability allows for real- time failure detection and network reconfiguration, thus improving channel-efficiency by 92%.. Our evaluation results demonstrated the effectiveness of ARS in recovering from local link-failures and in satisfying application’s diverse QoS demands. Keywords: Wireless mesh networks,autonomous network reconfiguration system,channel and radio diversity,on-line reconfigurability. I. INTRODUCTION A Wireless Mesh network (WMN) is dynamically self-organized and self-configured, with the nodes in the network automatically establishing and maintaining mesh connectivity among themselves . WMNs will deliver wireless services for a large variety of applications in personal, local, campus, and metropolitan areas networks . Still it is a challenging problem for preserving the required performance of such WMNs , due to heterogeneous and fluctuating wireless link conditions. For example, some links of a WMN may experience significant channel interference. Links in a certain area (e.g., a hospital or police station) might not be able to use some frequency channels because of spectrum etiquette or regulation. To overcome from the wireless link failures many solutions has been proposed in WMNs, but still they have several limitations as follows. First, resource-allocation algorithms , even though their approach provides a comprehensive and optimal network configuration plan, they often require “global” configuration changes, which are undesirable in case of frequent local link failures. Second, a greedy channel-assignment algorithm can reduce the requirement of network changes by changing settings of only the faulty link(s),this greedy change might not be able to realize full improvements. Third, fault-tolerant routing protocols, i.e, local re- routing or multi-path routing , they rely on detour paths or redundant transmissions, which may require more network resources than link-level network reconfiguration. We propose an Autonomous network Reconfiguration System (ARS) to overcome from above limitations , this technique allows a multi-radio WMN (mr-WMN) to autonomously reconfigure its local network settings for real-time recovery from link failures. ARS first searches for feasible local configuration changes available around a faulty area, based on current channel and radio associations. Then, by imposing current network settings as constraints, ARS identifies reconfiguration plans that require the minimum number of changes for the healthy network settings. Next, ARS also includes a monitoring protocol that enables a WMN to