1,721,210 research outputs found
An Integrated Mobility Framework for Ad-Hoc Distributed Personal Networks
No full textAdvances in wireless communications have driven an interest towards ubiquitous computing environments for nomadic users. This has led to a more user-centric vision of the network and to the concept of personal network: the user exploits his personal devices (both local and remote) and those in the surrounding environment to build dynamic ad hoc communication systems for the best experience in enjoying multimedia. In this paper, we propose a mobility framework for personal networks based on the idea of a 'personal mobile address' to bind a network address to the user rather than to a network interface, allowing the address to follow the user as he moves. We show how this mobility framework could be used for real-time interactive communications, in particular for voice-over-IP sessions managed by SIP. Moreover, we sketch a software architecture for this framework and evaluate its feasibility by means of a prototype
A Fluid Model for High-End Network Equipment with QoS Policied Aggregated Traffic
No full textIn this paper, we introduce a modeling framework
based on the fluid flow approximation, which can be effectively
applied to high-end nodes for transport/core networks. Our
proposal starts from a detailed analysis and considerations on
state-of-the-art network device architectures and QoS traffic
descriptors. In more detail, the model explicitly considers QoS
policer indexes (e.g., PIR, CIR, CBS, PBS) for aggregated
traffic, and tries to represent the node performance in terms of
worst-case loss probabilities. Numerical results have been
performed both in order to understand and characterize the
model accuracy, and in order to represent the behavior of a
reference transport node in the presence of mixed and
heterogeneous aggregated flows
A high-end Linux based Open Router for IP QoS networks: tuning and performance analysis with internal (profiling) and external measurement tools of the packet forwarding capabilities
No full textLinux Software Router: Data Plane Optimization and Performance Evaluation
No full textRecent technological advances provide an excellent opportunity to achieve truly effective results in the field of open Internet devices, also known as Open Routers or ORs. Even though some initiatives have been undertaken over the last few years to investigate ORs and related topics, other extensive areas still require additional investigation. In this contribution we report the results of the in-depth optimization and testing carried out on a PC Open Router architecture based on Linux software and COTS hardware. The main focus of this paper was the forwarding performance evaluation of different OR Linux-based software architectures. This analysis was performed with both external (throughput and latencies) and internal (profiling) measurements. In particular, for the external measurements, a set of RFC2544 compliant tests was also proposed and analyzed
An iterative optimization scheme for resource adaptation to user mobility patterns in cellular wireless systems
No full textA cellular wireless network is considered, where multi-class call admission control is exerted locally in a number of cells. Cells are in turn organized into clusters, which play the role of a higher hierarchical control level. The whole capacity (in number of channels) available in a cluster is distributed among its cells, according to variations in traffic parameters and user mobility, with the goal of minimizing the average blocking probability for the whole system. At the same time, on the basis of a temporarily assigned capacity, cell controllers regulate the admission of new calls and the handoff flow, by setting thresholds on the maximum number of new calls that prevent the blocking probability of the handoff calls to exceed a given upper bound. The overall resource allocation mechanism is described and numerical results are presented and discussed, in relation with different user mobility patterns
Energy-Aware Load Balancing for Parallel Packet Processing Engines
No full textIn this paper, we consider energy-aware network
devices (e.g. routers, switches, etc.) able to trade their energy
consumption for packet forwarding performance by means of
both low power idle and adaptive rate schemes. We focus on
state-of-the-art packet processing engines, which generally
represent the most energy-starving components of network
devices, and which are often composed of a number of parallel
pipelines to "divide and conquer" the incoming traffic load. Our
goal is to control both the power configuration of pipelines, and
the way to distribute traffic flows among them, in order to
optimize the trade-off between energy consumption and network
performance indexes. With this aim, we propose and analyze a
constrained optimization policy, which try to find the best tradeoff
between power consumption and packet latency times. In
order to deeply understand the impact of such policy, a number
of tests have been performed by using experimental data from
SW router architectures and real-world traffic traces
PC-based Software Routers: High Performance and Application Service Support
No full textDespite high potential and flexibility in developing new
functionalities and mechanisms, as well as the availability of wellestablished
networking SW, common criticism of Software
Routers, based on COTS HW elements and open-source SW, is
mainly focused on performance, especially for issues concerning
the data plane. In this respect, our contribution is aimed at
evaluation of architectural bottlenecks limiting the scalability of
Software Router performance, and identification of SW and HW
enhancements needed to overcome these limitations. Starting from
these considerations, we propose a feasible Software Router
HW/SW solution able to boost data plane performance while
maintaining the flexibility level typical of a SW approach
Road traffic estimation from location tracking data in the mobile cellular network
No full textMobile communications are widespread in a large part of industrialized countries and cellular networks, by which mobile radio-communications are supported, can give directly or potentially a huge amount of frequently updated information on the position of their users. This information can be used to estimate on-line the traffic conditions of important roads and highways, by exploiting the presence of mobile phones on-board a good deal of vehicles. This paper analyzes this possibility and proposes a mechanism, which gives the capability to estimate traffic parameters in the cells along a road with a partial presence of active cellular phones in the vehicles. The proposal has been tested by using an integrated vehicle and communication traffic simulator and different situations have been verified. The results are presented in the paper and they show a good level of accuracy and a satisfactory behavior of the proposed technique
An Open-Source Platform for Distributed Linux Software Routers
No full textIn this paper, our main objective is to explore how Linux Software Routers (SRs) can deploy advanced and flexible paradigms for supporting novel control-plane functionalities and applications. To this end, we investigate and study a new open-source software (SW) framework: the Distributed SW ROuter Project (DROP), which aims to develop and enable a novel cooperative middleware for distributed IP-router control and management. DROP allows logical network nodes to be built through the aggregation of multiple SRs based on the Linux operating system and commodity hardware, which can be devoted to packet forwarding or control operations. In addition to the original ForCES design, DROP aims to extend router distribution and aggregation concepts by moving them to a network-wide scale to enable and support value-added services for next-generation networks
- …
