The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Along the growth of internet traffic, the penetration of internet access from mobile user has been increased. By augmenting mobile data traffic, the mobile network capacity limits have become significant issues. To cope with the increased mobile user data to cellular radio networks, several offload approaches such as femtocells have been proposed. With regard to 3G core network offload, Selected IP...
The use of wireless internet increased rapidly due to the wireless network technology development such as Wibro, LTE and the extension supply of wireless terminals. A special quality of wireless network that is used by many people in an Access-Point increased overhead and lowered the service quality. When we look at All-IP network realization based on a single protocol and transition of address system...
It is used to identify users' connections by using the source IP addresses in the traffic log inside a firewall. In the case with pre-assigned IP addresses, the mapping relationship between IP addresses and users is fixed. However, an IP address can be counterfeited or abused. Therefore, an evil user can do any wicked network behavior with others' IP addresses when they get off work or take off. Users...
Mobility is one of the major features of wireless communication systems. In Universal Mobile Telecommunications System (UMTS) All-IP networks, two new approaches to support real-time relocation of Serving Radio Network Controller (SRNC) were introduced by 3GPP TR 25.936. Both of these approaches duplicate packets during the relocation process, which consumes extra resources and also some packets may...
Recently, Variable-structure Congestion-control Protocol (VCP) has emerged as a great practical alternative of deployment for congestion control by requiring the use of only two ECN bits in the IP header. However, VCP suffers from a relatively low speed of convergence and exhibits biased fairness in moderate bandwidth high delay networks due to utilizing an insufficient amount of congestion feedback...
The cognitive radio (CR) technology was proposed as a solution for the lack of wireless resources in an environment with a rapidly growing number of users. The CR advances the dynamic utilization of the licensed users' unused spectrum channels by secondary users. The paper looks into large CR networks by proposing two improved variants of IPSAG (IP Spectrum Aware Geographic routing algorithm). The...
In wireless multi-hop networks, when an end host would like to communicate with external wired hosts, data packets are to be transmitted at first to a gateway node which is connected to both a wireless multi-hop network and a wired network. When there are multiple candidate gateways to be connected, a wireless host should select one gateway as its own default gateway. One possible and simple way is...
The media richness of the services available to the end consumer has had a constant increase rate of about 8% per year over the last century. Therefore, a major bottleneck risk, namely that the home network jeopardizes the quality of experience (QoE) of future services, urges to have an appropriate Gigabit solution available for home networks. In this paper we point out the challenges of future gigabit...
Communication systems are becoming more complicated to support different types of services. How to coordinate different services around a user in a flexible and customized way is a new and interesting challenge. Service providers have proposed solutions such as the Universal Communication Identifier (UCI) and IP multimedia subsystem (IMS) but they require the modification of current systems and only...
This paper addresses the problem of routing packets between any nodes in a wireless mesh network (WMN) equipped with a set of reference landmarks. These reference landmarks are pre-selected Internet gateways or special nodes that broadcast beacon messages periodically. WMN nodes are then assigned multiple gradient-based coordinates, which are heights relative to the landmarks. These multiple heights...
Discrete event system specifications (DEVS) is a mathematical formalism based on system theoretic principles, which has evolved with state-of-technologies implementation over the past few decades. In this paper, we discuss a DEVS framework to solve parameter optimization problems. As a case study, we consider the Link-11 gateway that has been developed by the Joint Interoperability Test Command (JITC)...
The demand for wireless networks which provide high bandwidth and access to the Internet continues. In recent years, a new class of networks which fulfill these requirements evolved, wireless mesh networks (WMNs). Although WMNs satisfy the demand for high bandwidth and Internet access, there is a further, fundamental factor of success: the simple use. Except for small networks, manual configuration...
The paper consists of a collection of slides which discuss next generation network techno-economic insights. It presents the cost basics, the issues on the next generation access networks, the issues on backhaul and backbone networks, and the NGN cost structure.
Since the late 90's IP telephony, commonly referred to as Voice over IP (VoIP), has been presented as a revolution on communications enabling the possibility to converge historically separated voice and data networks, reducing costs, and integrating voice, data and video on applications. This paper presents a study over the standard VoIP protocols H.323, session initiation protocol (SIP), media gateway...
In this paper, we propose a suitable set of protocols schematically combining both radio handover and IP handover for heterogeneous network with the enhancement of relay nodes, that is considered as an important feature of the future radio network. Based on that, we develop the functional allocation of media independent handover entities for a 4G communication system developed by the European WINNER...
Infrastructure mesh networks offer a high-capacity wireless backhaul network through which client devices, such as PDAs, can connect to one another or with the Internet. In dynamically deployed mesh networks the routers within the mesh network may be unaware of existing Internet gateways and need to discover them on demand. In this paper we present a lightweight gateway discovery and traffic forwarding...
In the ten years since TETRA (terrestrial trunked radio) standard from ETSI (European Telecommunications Standards Institute) has been available on the worldwide market, it has become the leading PMR (private/professional mobile radio) technology of choice especially in networks for public safety. Since it was first standardized the system evolved in various directions, both in application and technology...
A scheme that exploits the broadcast nature of the wireless communication in order to achieve multicast content delivery is presented in this paper. As opposed to broadcasting, this method enables the clients to determine on-line the delivered content, and thus preserves the advantages of an individual service. On the other hand, a multicast content delivery is much more efficient than a unicast content...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.