In the last years a great concern has raised among population due to the placement of the base stations (BS) of cellular systems in urban areas. In some cases, it has been addressed with the (re)installation of BSs in...
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ISBN:
(纸本)1424400872
In the last years a great concern has raised among population due to the placement of the base stations (BS) of cellular systems in urban areas. In some cases, it has been addressed with the (re)installation of BSs in far suburban areas. However, in these cases, mobile stations (MS) must raise transmission power. Thus, users may -potentially- suffer a higher radio exposure. In this paper we quantified the variation of the transmission power in this application scenario. The study has been done by means of the OPNET/GSM framework simulation tool. Suitable propagation models and the GSM power control algorithm have been added to the model, in order to compute the MS transmission power in a real environment. Results reveal a significative increment of the MS transmission power when the BS is relocated to suburban areas. Therefore, we conclude that it is necessary to introduce modifications in the GSM networkarchitecture to solve this issue together with the BS placement problem.
In this paper, we discuss systems integration & testing challenges for NGOTNs. After an overview of the architecture, we discuss the issues we have experienced in the course of our evaluations. We end with recomme...
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In this paper, we discuss systems integration & testing challenges for NGOTNs. After an overview of the architecture, we discuss the issues we have experienced in the course of our evaluations. We end with recommendations to the vendor community.
Authors have developed an optical label switch router and the associated equipment which are designed for an Internet access network built on a passive opticalnetwork. The underlying concept of this system is to prov...
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Authors have developed an optical label switch router and the associated equipment which are designed for an Internet access network built on a passive opticalnetwork. The underlying concept of this system is to provide a connection-oriented optical path between peers, thus affording QoS guaranteed high-speed and real time communications.
Grid applications require a network to transport data between geographically distributed sites. The key characteristics of grid networks include adaptability, scalability, heterogeneity, the ability to span different ...
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Grid applications require a network to transport data between geographically distributed sites. The key characteristics of grid networks include adaptability, scalability, heterogeneity, the ability to span different administrative domains, and the support for various QoS levels. Our design objective is to support continuous large traffic flows between a set of known remote sites. We provision dedicated optical connections directly between end user premises. A solution is provided for end users to compose their virtual private networks by using network resources from different suppliers. Our networkcontrol mechanism is based on granting end users access to the management interfaces of network elements. End users can reconfigure the route and bandwidth of connections without carrier interventions. In this paper, we propose layered network management architecture for Grid opticalnetworks. An overview of the design of a user-controlled lightpath provisioning system is presented
In this paper, we present a new integrated opticalnetworkarchitecture called polymorphous, agile and transparent opticalnetworks (PATON) which combines different resource scheduling schemes based on polymorphous op...
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In this paper, we present a new integrated opticalnetworkarchitecture called polymorphous, agile and transparent opticalnetworks (PATON) which combines different resource scheduling schemes based on polymorphous optical burst switching (POBS) suitable for a variety of applications and services, and address several key technical issues related to the control and management of PATON. These issues include traffic adaptation and grooming, signaling and control packet format, polymorphic control for resource scheduling, and extentions to GMPLS. The resulting PATON compares favorably with other existing approaches presented in our related work [X. Liu et al., 2006].
We discuss the use of congestion control mechanisms at the network edges to complement traditional end-to-end congestion control. We argue that such mechanisms will be necessary in the future to deal with unresponsive...
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We discuss the use of congestion control mechanisms at the network edges to complement traditional end-to-end congestion control. We argue that such mechanisms will be necessary in the future to deal with unresponsive and even misbehaving traffic flows. A flexible congestion controlarchitecture is presented, together with concrete protocol designs building on the network Border Patrol proposal. More precisely, we show how to integrate flexible flow aggregation and connection admission control mechanisms into the NBP framework, together with improvements to the original scheduling mechanism. Performance evaluation using the ns-2 simulator is presented, and possibilities for future enhancements and open issues are also discussed.
There is a great deal of benefits for controlsystems to adopt the Internet to controller maintenance. This paper aims at developing a controller virtual maintenance system via the Internet to solve controller perform...
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There is a great deal of benefits for controlsystems to adopt the Internet to controller maintenance. This paper aims at developing a controller virtual maintenance system via the Internet to solve controller performance monitoring, controller fault detection and remote upgrading controller issues. The basic model of Internet-based virtual maintenance system has been proposed, which is very suitable for remote monitoring and controller maintenance applications. Several essential implementation issues of the system, including system architecture, networkcommunicationarchitecture and Web-based user interface, have also been discussed. A water tank system with a simple PID controller has been used as a case study to illustrate the solution for the remote controller maintenance
In this paper, we propose a nanocore/CMOS hybrid system-on-package (SoP) architecture that is suitable for any emerging nanotechnology. It combines the high density of nanoscale devices and some excellent properties o...
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In this paper, we propose a nanocore/CMOS hybrid system-on-package (SoP) architecture that is suitable for any emerging nanotechnology. It combines the high density of nanoscale devices and some excellent properties of current CMOS technology including high voltage gain and interconnection bandwidth and speed. The local computing cell is autonomous and error-tolerant (AET cell), interconnected with nearest neighbors through crossbar interconnect arrangement. Some key issues are studied in more detail: a possible communicationnetwork adopting time-division-multiplexing scheme; power distribution network; sensor and controlnetwork
This paper raises the issues faced in edge node design for an agile all-photonic network (AAPN) and proposes solutions. The architecture discussed addresses several issues such as packet processing, traffic aggregatio...
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This paper raises the issues faced in edge node design for an agile all-photonic network (AAPN) and proposes solutions. The architecture discussed addresses several issues such as packet processing, traffic aggregation and encapsulation, buffers implementation, local scheduling, QoS provision, traffic monitoring and internal control mechanisms. The main goal of this work is to provide a detailed description of the functional modules considering technologies readily available now or immediately on the horizon
network traffic has been rapidly increasing in proportion along with the spread of broadband access networks. The traffic of the core network is predicted to exceed its transmission capability in the near future. Ther...
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network traffic has been rapidly increasing in proportion along with the spread of broadband access networks. The traffic of the core network is predicted to exceed its transmission capability in the near future. Therefore, we propose a centrally controlled cache system with distributed cache storage in the access network. In this system, a cache control server manages a list of all contents cached by multiple cache servers. It can provide content requested by a user if it is cached in any of the cache servers in the access network. Additionally, it can reduce network traffic between the core network and the access network if the requested contents are cached in the cache server of the access network. We examine issues for the implementation of our system, and describe a prototype system. As a result of evaluation of the system, we have made it clear that our system architecture is suitable for an access network that accommodates one million users
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