Context-aware middleware architecture for vertical handover support to multi-homed nomadic mobile services

Abstract

Abstract. To accommodate the requirements such as high usability and personalization of 4G (mobile) networks, conventional handheld single network-interface mobile devices are evolving into multi-homed devices. Moreover, owing to the recent advances in the mobile middleware technologies, hardware technologies and association with the human user, handheld mobile devices are evolving into data producers and in turn acting as Nomadic Mobile Service (NMS) providers. For these devices, a vertical handover support is essential for the improved and reliable NMS delivery. Also, the fulfillment of the required QoS by the NMS is bounded by the end-to-end QoS (e2eQoS) provided by the underlying heterogeneous networks. To deal with these aspects, we propose a context-aware middleware architecture supporting vertical handover for the NMSes hosted on the handheld mobile devices. We emphasize the following features of the proposed middleware: 1) Context-aware computing based approach which uses an extensive set of context information collected from the mobile device and a fixed network; 2) Provisioning of and interaction with the end-to-end QoS (e2eQoS) predictions context source in the fixed network to obtain near-accurate estimation of the e2eQoS at a certain geographic location and to reduce unnecessary power usage in searching for available networks.

Odin: Context-Aware Middleware for Mobile Services

“…Content Distribution Framework (CDF) [9] and Contory [10] are examples of distributed frameworks that act as context brokers to collect CI from multiple devices. Context-aware Mobile Service Platform (CA-MSP) [11] aims to improve end-to-end quality of services hosted on a mobile service platform similar to Odin. Unlike other systems, which can gather context information both within the device and from external sources, AOMA and NAL are restricted to sources within the device they are deployed on.…”

Empowering intermediary-based infrastructure for mobile service provisioning

“…Among work that rely on some sort of intermediary, the JSA-based Mobile Service Platform (MSP) [1], [12] is the most similar to our solution. Mobile Host (MH) [2] and work done by Chaudron et al [3] expose services hosted within mobile devices as Web Services.…”

“…Therefore only clients aware of the respective infrastructures -JXTA and IMS -are able to consume the services. Though MSP provides context-awareness processing [12], part of the processing is carried out on the mobile device; the overhead of this could compromise the QoS offered by the device-service. Similar performance and scalability issues are present with Nokia's solution, which hosts the entire service within the device.…”

“…These include solving the reachability problem [1]- [4], offloading computationally intensive tasks such as security-related processing [14] and managing context information [12], [13]. However, they do not fully utilise the capabilities of an intermediary and lack mechanisms, such as caching and serverside resource leasing, that can be used to enhance service availability and scalability.…”

Efficient Algorithm for Vertical Handover in Heterogeneous Wireless Mobile Network

“…mobile cell phone, tab-pc, Laptop) to handover among the various types of networks i.e, cellular, wireless area network (WAN, wide local area network (WLAN) [1]. As we look back to the traditional cellular approach to the communication which also mention with name GSM, the predefine threshold which compare different parameters in specific order is basically used to handle handover decisions [2] the handover are not only cause of ongoing call connections but it can be helpful in order to provide best services package and to fulfill their requirements for stable communication with the comparison to horizontal handover the newly presented vertical handover not only based on the received signal gain which is known as RSS but also the different services i-e class mapping among the handoff-out and handoff-out networks [3] high data rate services (HDS) and Nonpareil global roaming (NGR) eminent fourth generation 4G from the previous of wireless networks (WN) [4], [5].the 4g networking model contains, mobile nodes or handsets terminals connects by different multiple interfaces which will be able to select the best suitable link for access among the all available alternatives. Those ace links consist of IEEE 802.11 access of wireless local area network (WAN) [6].…”