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In this paper we explore the concept of an all-wireless Network of Femtocells (NoF). A NoF can be seen as a wireless mesh network providing multi-hop connectivity amongst femtocells and, in turn, to the Evolved Packet Core (EPC). As specified by 3GPP Technical Specifications (TS), IP networks are used to transport data through any interface and, in particular, through the S1 interface in the Evolved...
Telecom operators and vendors predict that mobile networks will suffer a serious IP traffic explosion in the very near future. Besides designing, standardizing and deploying novel architectures like LTE/EPC, also radio access and core network technologies of existing communication systems must be extended in order to make them able to serve the expected traffic demands within limited expenditure growth...
With the goal of solving shortcomings of MIPv6, alternative protocols such as HIP have been proposed by the research community. In the same way as for MIPv6, solutions to cover NEMO scenarios based on HIP have been worked out. However, there is little agreement on which the best way is to handle NEMO scenarios when using HIP. In this work we analyze different HIP based NEMO solutions and define mathematical...
Efficient vehicle-to-Internet routing and address autoconfiguration are two of the missing pieces required to provide Internet connectivity from vehicles. Here, we propose TREBOL, a tree-based and configurable protocol which benefits from the inherent tree-shaped nature of vehicle to Internet traffic to reduce the signaling overhead while dealing efficiently with the vehicular dynamics. The paper...
This paper presents some of the activities currently performed within the EU FP7 E-SPONDER project "A holistic approach towards the development of the first responder of the future". E-SPONDER is a suite of real-time data-centric technologies that will provide enhanced information and communication support to first responders that act during normal and abnormal events. The paper demonstrates...
Within IEEE 802.11 Wireless Local Area Networks (WLANs), client stations can move freely, but because of the short range of their Access Points (APs), they usually need to reassociate with different APs to continue to communicate. When changing APs, a client station starts a process known as a handoff that can take up to 2 seconds, which is too long for real-time applications such as Voice over IP...
This article deals with the interference limitations of introducing femtocells in existing mobile networks. Femtocells are cheap alternatives for mobile operators to extend their network and to provide better coverage. However, having more femtocells increases the interference in existing components. Finally, the whole system could lock up itself, if the interference exceeds the maximum acceptable...
In this paper, we analyse and compare two architectures providing an all-IP based connectivity and mobility for mobile devices over heterogeneous access technologies: Evolved Packet System (EPS) as specified by 3GPP and Secure Mobile Architecture (SMA), a standardization effort by The Open Group (TOG). We briefly present each architecture and qualitatively evaluate their advantages and disadvantages...
As IP multicast allows the efficient use of network bandwidth for multipoint communication, it is expected to be an essential communication type for delivering multimedia services to mobile nodes (MNs). In this paper, we review current status of PMIPv6 multicast listener support being standardized in the IETF and point out limitations of the current approach. Then, we introduce a fast multicast handover...
LTE has a distributed system architecture optimized for IP connectivity. Circuit switched technology is not supported by LTE at all; therefore it provides VoIP based voice service only. In LTE, VoIP packets are carried with significant protocol overhead, thus transporting each voice packet separately is a waste of bandwidth. A possible way to improve the bandwidth efficiency of voice service over...
In point to multi-point wireless transmissions, header compression protocols like RoHC (Robust Header Compression) can degrade the communication when used on fading channels and, at the same time, introduce long periods of silence, due to decompression problems at the receiver side. This paper presents R-RoHC, a reactive header compression mechanism designed to cope with RoHC misbehavior in case of...
Heterogeneous radio network which efficiently utilizes the resources of multi-radio access systems is one of promising approaches for flexible, reliable and high-capacity communication. Regarding the cooperative controlling functionality in the heterogeneous system, two schemes are considered to be applicable to the efficient usage of multi-radio systems. One is a link selection and the other is a...
Key incentives for mobile operators to offer femtocell services are the possibilities to cost-efficiently enhance indoor coverage and to offload traffic from the macro-cellular network. While femtocells were originally conceived for standalone deployments in user homes, there is an increasing interest in exploiting their advantages also in an enterprise context. However, with the current architecture...
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