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In order to plan the network construction reasonable and ensure the quality of network service, it is important to measure the Link-bandwidth utilization and get the flow information. One of the methods to monitor network efficiently is based on flow-conservation, and the problem of searching a solution for this method could be deduced to solving weak vertex cover problem, which has been proved NP-hard...
The policy and charging control function is defined as PCC (policy and charging control) by 3GPP and SBBC (service based bearer control) by 3GPP2. It is valuable to establish an experimental testbed for PCC and SBBC to improve and verify the related performance. At present, we can make use of open source IMS (OSIMS) and UCT PCF to simulate 3GPP PCC, but there is no testbed for the policy control function...
CAC is one of the most important parts of resource management in wireless cellular networks to keep the system work stable by accepting or rejecting users' service requests. A call admission control(CAC) algorithm(DQ-CAC) based on unfair quality of service(QoS) degradation and queue buffers in wireless mobile networks is proposed. The handoff call dropping probability(CDP) for the high priority, call...
An effective near-field - far-field transformation technique with spherical spiral scanning tailored for quasi-planar antennas is here proposed. Such a technique is based on the nonredundant sampling representations of the electromagnetic fields and makes use of a flexible source modelling, formed by two circular ??bowls?? with the same aperture diameter, but different lateral bends. Such a modelling...
A unique frequency reuse scheme by means of cell sectorization is proposed in this paper that reuses effectively a given frequency resource in a cellular environment. The key concept is to find a scheme that controls interferences among neighboring cells in a systematic manner while achieving high frequency reuse factor. Based on, user distribution in a cell, two problems are investigated. First,...
The biggest contemporary drawback in the maintenance and distribution of the global state is the increase in communication overheads. Therefore, localized routing is the method to avoid this problem. The network in this technique is inferred by the source nodes using statistics which are collected locally. The main aim of this paper is to present new localized algorithms to avoid some problems associated...
In lambda-grid networks, data files are stored on file servers as replicas, and those replicas are downloaded in parallel to reduce downloading time. However, parallel downloading raises the blocking probability of lightpath establishments because parallel downloading wastes many wavelength resources. To resolve this problem, we propose a parallel downloading scheme with network coding which encodes...
This paper proposes a design methodology for solving a multi-objective circuit design problem, which is based on formulating the problem as a multi-objective geometric program (MOGP) with variable weight factors. In general, to solve the problem using GP, multiple objectives are combined into a scalar objective by assigning arbitrary, fixed weight factors to individual objectives. On the contrary,...
Sixport calibration set is discussed in the paper. The used calibration method is mentioned, standard calibration sets are presented with their parameters and from them the electronic calibration set is developed. Schematics with real measured values of S11 are shown and obtained results are discussed.
This paper proposes an algorithm for estimating available bandwidth of network nodes. The algorithm, based on statistical information of the network nodes, calculates link utilization and estimates the available bandwidth through the exponentially weighed moving average (EWMA) filter, and can thereby estimate precisely the available bandwidth of the link in the next time interval. Compared with conventional...
This paper explores the interdependencies between buffer size, throughput, latency and packet loss in runtime adaptable network-on-chips. Based on the SystemC simulation model of a runtime reconfigurable system-on-chip, buffer sizes of switches and of network interfaces were adjusted to find the optimal relation between throughput, latency and packet loss. A synthetic traffic generator parameterised...
In this paper, we study a practical approach to change the legacy network architecture, which has become complicated and inefficient in its attempts to meet new telecommunications demands. The array of equipment required to support time division multiplexing (TDM), asynchronous transfer mode (ATM), frame based packets (e.g. frame relay), and other internet protocol (IP) traffic in the current architecture...
The continued size reduction of cellular phones, especially reduction their thickness leads to challenges for phone and antenna designers. Efficient antenna solutions that cover all needed bands are required no matter what volume has been allocated for the antenna. The optimal solution regarding antenna thickness will be achieved when the antenna is integrated into the PCB of the device. A particularly...
In network on chip (NoC), the traditional routing schemes are routing the network through a single path or multiple paths from one source node to a destination node, which will minimize the congestion in the routing architecture. Though these routing algorithms are moderately efficient, but time dependent. To reduce overall data packet transmission time in the network, we consider a network with multiple...
This paper examines the design of full feed-forward sigma-delta modulator which is much more suitable for the CMOS digital process with low supply voltage than the traditional second-order feedback loop. The full feed-forward system reduces the modulator's sensitivity of the circuit nonidealities and decreases the internal signal swing to half the full scale. An implementation in a 0.35 ??m CMOS technology...
In this paper, a distributed mobile relay power control (DMRPC) scheme for maximizing individual cell throughput is proposed for mobile relay station (MRS) aided system. In the system with DMRPC, the power levels of MRSs are controlled by individual cell without cell cooperation and signaling overhead, and the appropriate power levels of MRSs are selected to maximize the cell throughput of their individual...
Scalability and high degree of playing continuity are key points to large-scale application of video-on-demand system. This paper presents a peer-to-peer (P2P) video-on-demand system CPVoD based on a cylindrical structure. It can enhance the efficiency of finding data by combining the accuracy and efficiency of DHT and the simplicity and practicability of Gossip protocol. A data scheduling strategy...
As the streaming media files growing larger and larger in size, it inevitably aggravates the network congestion and user perceive latency, to settle problem lots of caching algorithms have been applied in video-on-demand (VOD)system. However, different algorithm is correspondence to an unique caching replacement policy, which limits its applications and the effects are not very satisfied, so in VOD...
It is necessary to control the P2P traffic among ASs (autonomous systems) while the P2P applications occupy the most bandwidth of the backbone network. Instead of only restricting the P2P applications, the paper suggests an intelligent relay method based on P2P communities model. The proxy of content caching (PCC) nodes is proposed which are used to manage the local content cache in the P2P communities...
In Disruption Tolerant Networks, simply flooding packet scheme has a major drawback in terms of network congestion. This paper proposes a new routing algorithm, called Adaptive Priority Routing with Ack_mechanism (APRA). APRA arranges the forwarding sequence and the dropping sequence based on their assigned priority. The priority is determined by the TTL, Delivery Predictability, and Replication Density...
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