In heterogeneous wireless systems, the seamless and efficient handoff between different access technologies (vertical handoff) is essential and remains a challenging problem. The co-existence of access technologies with largely different characteristics results in handoff asymmetry that differs from the traditional intra-network handoff problem. In the case where one network is preferred, the v...

Next-generation wireless systems (NGWS) integrate different wireless networks, each of which is optimized for some specific services such as WLANs, WiMAX, General Packet Radio Service (GPRS) and Universal Mobile Telecommunications System (UMTS). The most important and challenging issue is seamless handoff management in NGWS to ensure the Quality of Service (QoS). In this paper, we propose a han...

We propose a new fast handoff mechanism, NeighborCasting, for use in wireless IP networks that utilizes neighboring Foreign Agent information. NeighborCasting is based on the policy of utilizing, or perhaps even wasting, wired bandwidth between Foreign Agents, while minimizing rf (radio frequency) bandwidth exchanges, in order that handoff latency is minimized. We minimize the handoff latency b...

The Wireless network plays a significant role in today’s life. A handoff is a one of the foremost factors in order to provide continuous connectivity service to the mobile user. A handoff will be taken place by different network in order to maintain connectivity. In the existing system handoff will be measured without usage of relay network. To increase the quality of service within WLAN and WI...

The significance of having a correct criterion for evaluating handoff methods is that telecommunication providers can choose the right handoff algorithm in a cost effective way. In cellular or micro cellular environments in cities, users often move on predetermined paths. As the built environment is not changed often, this regularity can be exploited in a pattern recognition based handoff metho...

Handoffs represent a critical transition point in patient care that play a key role in patient safety. Our quality improvement project was a descriptive observational study aimed at standardizing pediatric hospitalist handoffs via implementation of a handoff checklist, with the goal of improving handoff quality and physician satisfaction within six months. The handoff checklist was quickly adap...

WIMAX is a wireless high speed internet communication technology in geographical areas which is having higher data transfer rate. This is a emerging data transfer mechanism for its superior quality over their former communication technology like cable-modem and DSL connections. Mobile devices scans more channels in order to search neighboring base stations which selects the optimal target. The ...

Recent research in wireless communications technologies has focused to the development of Next-generation wireless systems (NGWS) which integrate various existing wireless networks technologies, each of which is optimized for some specific services such as WLANs, WiMAX, General Packet Radio Service (GPRS) and Universal Mobile Telecommunications System (UMTS). The most important and challenging ...

In this Paper, the study focuses on the various handoff management issues in Heterogeneous wireless network. A handoff scheme is essential to provide continuous connections whenever a mobile node moves from one coverage area of network to another. The handoff management issues consist of finding the appropriate time to perform the handoff depending upon RSS (received signal strength), traffic, ...

IEEE 802.11i standard specifies full authentication and preauthentication for secure handoff in 802.11 wireless LAN (WLAN). However, the full authentication is too slow to provide seamless services for handoff users, and preauthentication may fail in highly populated WLANs where it is highly probable that the cache entry of a preauthenticated user is evicted by other users before handoff. In th...