Next generation wireless network is foreseen as the combination of heterogeneous wireless networks capable of providing enhanced services to mobile users. Vertical handoff is a crucial issue in providing service to mobile users, in a heterogeneous network. To maintain continuous service during vertical handoff period, the handoff procedure should consider the noise and interference in the netwo...

Code-division multiple-access (CDMA) cellular systems use soft handoff. Although the capacity of CDMA systems is interference-limited in nature, channel shortages may occur because soft handoff uses several channels simultaneously. To cope with this problem, we propose an improved handoff method that borrows channels from stationary calls participating in soft handoff and allocates the borrowed...

BACKGROUND AND OBJECTIVES Previous studies have emphasized the importance of effectual communication during patient handoffs. The objectives of this study were to (1) implement a resident-driven quality improvement project to improve handoffs by including key elements that are necessary for a safe and effective handoff. We chose to use the IPASS (illness severity, patient summary, action items,...

The performance of handoff initiation algorithm is one of the key issues for providing roaming capability in wireless LAN (WLAN). In this paper, we propose a new handoff initiation algorithm for data transmitting in WLAN. Our proposal combines association time, system load and signal/noise ratio (SNR) together to decide whether mobile node should handoff or not. The goal is to reduce the number...

In this study, we will propose an advanced multi-slope quality-based handoff control algorithm to effectively manage connection quality while minimizing the required resources. In a wireless communication system, there exits a non-linear relationship among the connection quality, the overall interference level, and the required resources. To meet the handoff design challenge in 3G systems, we w...

-In this work we propose a seamless vertical handoff solution. We realize the seamlessness by adding a virtualinterface module into current Linux kernel. Different from the mobile-IP based-vertical-handoff systems, there is no need of extra agents or handoff servers in our system. In the experiment, we show that the handoff latency is so short that it is unnoticeable to the applications. Rebuil...

In this paper, we propose a novel and simple soft handoff algorithm That helps fair distribution of network resources among users. Due to centralized soft handoff mechanism, no further computational complexity is added to the mobile sets. Because we use Fuzzy Inference system (FIS) in adapting thresholds of our algorithm, algorithm is able to release the traffic channels at high traffic load fo...

Mobility management, integration and interworking of existing wireless systems are important factors to obtain seamless roaming and services continuity in Next Generation Wireless Systems (NGWS).So it is important to have a handoff scheme that takes into account the heterogeneity of the network. In this work we propose a handoff scheme which takes handoff decision adaptively based on the type o...

Current handoffs are not designed to achieve multiple desirable features simultaneously. This weakness has resulted in handoff schemes that are seamless but not adaptive, or adaptive but not secure, or secure but not autonomous, or autonomous but not correct, etc. To face this limitation, we initiated a research project to develop a new kind of handoff system which attains multiple purposes sim...