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Content delivery networks have been widely used for many years providing service for millions of users. Lately, many of these networks are migrating to the cloud for its numerous advantages such as lower costs, increased performance, availability and flexibility in installing new resources. This paper introduces a new approach towards load balancing as well as power reduction in cloud-based content...
This paper explores possible advantages of the Information Centric Networking (ICN) paradigm in a geostationary satellite network. We find out that, with respect to plain HTTP services, ICN makes possible to reduce the downstream bandwidth consumed for Internet access by better exploiting the temporal locality of references within requested streams of Web contents. We present an ICN satellite architecture,...
VoIP (Voice over Internet) provides delivery of voice information over unsecured IP-based networks like the Internet. VoIP data, signaling and voice, needs to be secured in such an environment. Security mechanisms take their toll on VoIP system performance. SIP is dominant signaling protocol for VoIP. This paper measures relative decrease in VoIP performance of system with secured SIP signaling over...
In a scenario where service reliability is achieved through multiple providers, it is crucial to detect faulty equipment. Such a scenario is the IP Multimedia Core Network Subsystem (IMS). where service is provided by multiple instances of the Application Server (AS). These servers may reside on remote locations, and network link between the Call Session Control Function (CSCF) and AS may become broken...
We show that the performance of downloads in a 3G/HSPA mobile network can be significantly degraded by a concurrent upload that saturates the uplink buffer on the mobile device. In particular, we found in some instances that download speeds can be reduced by over an order of magnitude from 2,000 kbps to 100 kbps. To mitigate this problem, we propose a new algorithm called Receiver-side Flow Control...
Nowadays, the end-users have multitude of offers that make service prices decrease in using a network environment with multiple-operators and multiple-network. Consequently, the competition between network providers increases. The customer is today in a strong position with ability to select the best one among different competing providers. Besides similar pricing schemes, which are a useful decision...
Content Delivery Networks (CDN) are overlay network of servers being used to deliver growing traffic demands on the Internet. As a result, CDNs are facing ever-increasing operating costs. Internet Service Providers (ISP) charge CDNs on server traffic, computed using common usage-based charging models, e.g. 95th Percentile charging. We propose Network Cost Aware Request Routing, NetReq, that assign...
Group communication plays an important role in the distribution of real-time data for IPTV, multimedia conferencing, or online multiplayer games, but IP multicast remains unsupported in today's global Internet. Hybrid solutions that bridge between overlay and underlay multicast are a promising escape from the deployment dilemma of multicast. In this paper, we examine the real-time capabilities of...
Disaster situations are a challenge for network operators because they result in an extraordinary large number of calls being opened simultaneously compared to normal operating conditions. The Quality of Service (QoS) and Quality of Experience (QoE) for the end user can be widely affected by peak loads and result in severe degradation, basically due to congestion on bottlenecks inside the network...
Active network measurements play an important role not only in network monitoring for OAM purposes, but also in assessing the current network status and providing real-time information for the optimization of applications. This paper proposes the extension of SNMP-based monitoring mechanisms to also support active in-network measurements conforming to the standardized OWAMP protocol. A specialized...
One of the most important problems of the voice user interface (VUI) design on portable maintenance aids (PMA) is the conflict between the complex speech recognition algorithms and the limited resource of PMA. To resolve this conflict, a VUI system based on cloud computing has been designed. This system adopts the speech recognition server on the background cloud computing platform to support the...
As a routing algorithm defined in IEEE 802.15.5, server routing (SR) can attain the optimal routes between source and destination nodes. However, we found that it has the following two problems: (1) unicasting the Link State Registrations does not utilize the available topology information, and (2) the relay list of Route Formations includes redundant contents. To address these problems, we propose...
Using a decentralized content distribution scheme is appealing when considering the potentially enormous amount of data generated by high quality video on demand (VoD) services. There is, unfortunately, little information available about which form of content delivery would yield maximum benefit and how it should be configured to achieve that, given a certain cost structure and request distribution...
Serving the most updated version of a resource with minimal networking overhead is always a challenge for WWW Caching, especially, for weak consistency algorithms such as the widely adopted Adaptive Time-to-Live (ATTL). We adopt the Optimal Stopping Theory (OST) and, specifically, the Odds-algorithm, to enable the caching server to accurately handle the object refreshing and the stale delivery problem...
In this paper, we propose a modification of the observe extension of CoAP to include Quality of Service (QoS) support for timeliness. The proposed QoS support is based on delivery priority. Nodes are able to express the priority order with which they wish to be notified. Furthermore, they are also able to specify which notification they want to receive. We classify the notifications in two categories:...
The effectiveness of synthetic coordinate systems against DoS and spam stems from the fact that, while changing or hiding a logical address is easier, changing the location of the spammer inside the network should be harder. But synthetic coordinate systems are limited by the fact that malicious nodes can easily lie about their position or introduce additional delays which have an immediate impact...
Based on the requirement of the transmission of real-time service in wireless sensor networks, the paper studies Weighted Fair Queuing (WFQ) algorithm profoundly. Having analyzed the reason why WFQ can't ensure the quality of real-time service, it proposes P-WFQ, which is a priority-based Weighted Fair Queuing (P-WFQ) algorithm. With sliding windows, P-WFQ combines WFQ and the priority-based mechanism...
Cloud computing services are becoming integral part of people's daily life. These services are supported by Internet data centers (IDCs). As demand for cloud computing services soars, energy consumed by IDCs is skyrocketing. This paper studies an energy management problem -- how to minimize energy cost for IDCs in deregulated electricity markets. While several existing works handle this problem by...
This paper investigates Embedded Way Prediction for large last-level caches (LLCs): an architecture and circuit design to provide the latency of parallel tag-data access at substantial energy savings. Existing way prediction approaches for L1 caches are compromised by the high associativity and filtered temporal locality of LLCs. We demonstrate: (1) the need for wide partial tag comparison, which...
Many Internet users use P2P live streaming services which deliver live video contents to many users. In the services, the video content is sliced into small pieces called chunks. The peers not only receive but also send the chunks to watch the video contents. Source's load for delivering is reduced. In an Offer Select method, each peer offers sendable chunks to it's neighbors. The neighbors select...
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