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The issue of supporting mobility in Wireless Sensor Networks is recently attracting increasing attention within the research community as new-born application scenarios require the deployment of hybrid network architectures composed of fixed and mobile sensor nodes. In this work, we address the problem of mobility management in WSNs by proposing a tree-based routing protocol able to support mobile...
Inter-cell interference coordination (ICIC) is one of the key technologies in the multi-cell radio resource management of mobile systems. It plays a vital role in mitigating strong inter cell interference and guaranteeing proper quality of services for in-progress sessions. Because heterogeneous deployment is adopted in LTE-Advanced, and interference problem becomes serious. In this paper, we propose...
In this paper, we report on a mobile broadband wireless access (MBWA) system field trial with Fast Low-latency Access with Seamless Handoff Orthogonal Frequency Division Multiplexing (FLASH-OFDM), which was carried out in a suburban area of Sendai city. This paper focuses on coverage and downlink throughput performance, which are the most important criteria for assessing broadband wireless data communication...
Providing diverse broadband services economically every time, even to mobile subscribers will be a major challenge for the telecommunication community. IEEE 802.16 networks are going to provide broadband wireless access as a fixed wireless broadband solution. However, the IEEE 802.16e as an amendment to 802.16d which expands the standard to allow mobile subscriber station. As handover is an important...
IEEE 802.16 WiMAX (Worldwide Interoperability for Microwave Access) is a major standard technology for wireless metropolitan area networks. Quality-of-service (QoS) scheduling classes and mobility management are two main issues for supporting seamless high-speed communications. Previous works on WiMAX handoff however have mainly addressed a particular scenario or a specific QoS class. This work proposes...
Mobile satellite services are attracting renewed attention stemming from the FCC ancillary terrestrial component ruling that allows satellite spectrum to be used for integrated terrestrial services in the footprint of the satellite. This attention is focused on the development of dual-mode satellite-terrestrial devices to facilitate hybrid satellite-terrestrial networks intended by the ATC order....
A mobile ad hoc network is an infrastructureless multi-hop system of wireless autonomous mobile nodes. Reactive routing protocols like ad hoc on demand distance vector routing (AODV) and dynamic source routing (DSR) are appropriate for mobile environments, because they cope quickly with topological changes. Lately cooperative-transmission-based routing protocols have been proposed to further save...
Current mobility management approaches are highly centralized and hierarchical. They make use of centralized anchors located in core networks, responsible for forwarding traffic to/from mobile nodes' location. Emerging networks standards developed for new broadband cellular radio interfaces are use flat architecture where control functions are deployed in network edges such as evolved base stations...
Various standardization development organizations consider network-based mobility management in future mobile communication networks to complement host-based mobility management. Proxy mobile IPv6 is currently being standardized to suit basic requirements of network-based mobility management, such as no-host involvement in the location update procedure. In this paper, we want to motivate advanced...
Communications-on-the-move (COTM) is becoming an indispensable feature for next generation satellites. Many commercial and government based satellite communications programs are including support for terminal mobility as a key feature. Adding COTM capabilities to regenerative (non-transponded) satellite systems, such as layer-2 and layer-3 switching satellites impacts the satellite system, network...
Recently, there have been a lot of researches on hybrid duplexing (HD) to exploit advantages of both time division duplexing (TDD) and frequency division duplexing (FDD). In the next generation communication, heterogeneous cell structure in which each cell would apply proper duplexing mode independently will be raised instead of homogeneous cell structure. However, in heterogeneous cell environment,...
Mobile broadband usage is taking off, demanding improved services and increased capacity of mobile networks. To meet these requirements, 3GPP has defined LTE (the 3GPP Long Term Evolution). This paper presents some key characteristics of the LTE radio interface, including physical layer and radio resource management functions, and evaluates their impact on system performance. As compared to a reference...
Supporting mobility is both promising and challenging feature of the emerging IEEE 802.16e wireless networks, commonly known as WiMAX. Although the IEEE has released an amendment to the original IEEE 802.16 standard in which mobility and handover are added as basic capabilities, the amended standard (IEEE 802.16e) defines only a frame work without providing specific methods or algorithm for handover...
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