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There is the problem of absolute discrimination in current Active Queue Management (AQM) algorithms for Differentiated Services, the throughput and link utilization of network are decreased. In this paper we have presented an AQM algorithm, called Weighted-queue-length RIO-C (WRIO). WRIO realizes relative discrimination of different drop precedence, and improves link utilization, especially for the...
TCP-friendly congestion control is the key technique in next-generation-networks. An effective congestion control which uses the predominance of dynamic thresholds self- adaptive TCP-friendly congestion control (DATFCC) is proposed. The size of the receiver buffer butter was dynamically adjusted according to the state of the networks, the dropping probability was determined by the type and the size...
The unsatisfactory performance of TCP in high speed wide area networks has led to several versions of TCP- like H-TCP, Fast TCP, Scalable TCP, Compound or CUBIC, all aimed at speeding up the window update algorithm. In this paper we focus on Scalable TCP (STCP), a TCP version which belongs to the class of Multiplicative Increase Multiplicative Decrease (MIMD) congestion protocols. We present a new...
This paper presents a set of controllers for TCP/IPv6 networks. These controllers are developed from the traditional proportional integral controller, and can support differentiated quality of service requirement of the end users. Those requirements are labeled in the IPv6 header of the packets, checked by the controllers upon their arrival to the routers, so as to provide guidance to further dropping...
This paper discusses the inter-layer mobility and quality of service (QoS) support in a multi-tier Wireless Overlay Network (WON). It proposes integrated network architecture with layer manager for vertical handoff, switching and mobility management using Mobile IP protocol. Various functionalities of the Layer manager are implemented as modular blocks and are distributive over the gateways in each...
Tor (the onion routing) provides a secure mechanism for offering TCP-based services while concealing the hidden server's IP address. In general the acceptance of services strongly relies on its QoS properties. For potential Tor users, provided the anonymity is secured, probably the most important QoS parameter is the time until they finally get response by such a hidden service. Internally, overall...
New applications made possible by the rapid improvements and miniaturization in hardware has motivated recent developments in wireless multimedia sensor networks (WMSNs). As multimedia applications produce high volumes of data which require high transmission rates, multimedia traffic is usually high speed. This may cause congestion in the sensor nodes, leading to impairments in the quality of service...
Random Early Detection (RED) can effectively avoid transmitting congestion at routers, but RED can not provide bandwidth fairness. Different packet sizes are one of the reasons that damage fairness. RED routers provide little protection from some bulky data flows that use considerably more bandwidth than other flows in time of congestion. Modifying the formulas of calculating final packet-discard...
The paper studies the bandwidth allocation process over satellite communication systems as a multi-objective programming (MOP) problem and evaluates an allocation method called "combined Utopia minimum distance" (combined UMD). The entities of the system are earth stations and, for each of them, a set of performance metrics (represented by specific analytical functions), which compete to...
Precedence-based assured services (PBAS) is defined in a simple term as "PBAS ensures that when a network is stressed, higher precedence messages will receive their QoS with higher probability than lower precedence messages". PBAS allows messages and traffic flows in the GIG to be processed according to their precedence requirements. This paper introduces some of the functional roles and...
In this paper we develop and numerically explore the modeling heuristic of using saturation attempt probabilities as state dependent attempt probabilities in an IEEE 802.11e infrastructure network carrying packet telephone calls and TCP controlled file downloads, using enhanced distributed channel access (EDCA). We build upon the fixed point analysis and performance insights. When there are a certain...
This paper proposes an idiographic implement scheme of MPEG-4 real-time video streaming for multi-channel based on RTP/RTCP over WLAN. It also proposes an effective synchronistic model for multi-channel video based on timestamp synchronization. Aiming at the wireless QoS mechanism, this system applies to an ECN algorithm based on RTCP feedback rate control algorithm-TFRC. The ECN algorithm improves...
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