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As part of the resource allocation mechanisms, each router must implement some queuing discipline that governs how packets are buffered while waiting to be transmitted. Various queuing disciplines can be used to control which packets get transmitted (bandwidth allocation) and which packets get dropped (buffer space). The queuing discipline also affects the latency experienced by a packet, by determining...
Presently, It is paid much attention to network performance, as a main criterion, delay is becoming more and more important. A network model for a certain network is built by simulation software. It analyses the relations among delay, throughput, user number and bandwidth. Then it points out the direction to decrease the network delay by simulation and it can optimize the network performance with...
This paper presents a novel probing scheme which can be used for estimating the available bandwidth of subpaths, without the requirement of control over both endpoints of a network path. Instead of a probe-packet receiver, this scheme uses the ICMP capability of routers. An estimate of the available bandwidth from the endpoint to a router is obtained in much the same way as for state-of-the-art end-to-end...
We discuss a fundamentally new approach to digital packetized video bandwidth prediction (i.e., bandwidth forecasting). This fundamentally new approach provides an accurate bandwidth forecast at the expense of increased queueing delay. We outline this new forecasting method we call feedforward bandwidth indication (FFBI), compare it to existing forecasting methods, and analyze the tradeoffs associated...
This paper proposes an improvement for SCTP congestion control procedures in high-speed networks. Current SCTP congestion control algorithms may lead to premature termination of the startup phase, resulting in an under-utiliz ation of network resources and a corresponding degradation of network performance. Therefore, this paper develops an algorithm that estimates network conditions during the startup...
The use of ldquocognitive radiordquo (CR) technology is viewed as the key technology to fully utilize the bandwidth. In this paper, a CR-based dynamic spectrum access (DSA) device named fuzzy active period adaptor (FAPA) is proposed in a downlink transmission of IEEE 802.16h systems. FAPA decides the active period of IEEE 802.16h system to efficiently coexist with a WLAN system in unlicensed spectrum...
Multi-nexthop routing mechanisms is the key point in network congestion, and the essential question is how to forward packets among multi-nexthop to reach equiponderant forwarding. This paper proposes an equiponderant forwarding strategy in multi-nexthop routing, which forwards the packets according to the actual capability of each node, and resolves the equiponderant forwarding problem of multi-nexthop...
Recently considerable efforts have focused on the design of self-adaptive flow control schemes for wireless multicast service. This attention is significantly necessary due to the large scale heterogeneous wireless multicast receivers, especially those with large propagation delays, which means the feedbacks arriving at the source node are somewhat outdated and harmful to the control actions.To solve...
Application layer multicast (ALM) has resolved the issue of deployment, but effectiveness inferiors to IP multicast. In this paper, the research is focused upon the influence on the communication efficiency of the multicast tree using three kinds of node selection strategy, which are based on min-delay, max-bandwidth, and nearest network topology. This paper presents NNT, a distributed spanning tree...
A new end-to-end available bandwidth measurement method based on the parity-packet pair model is proposed on the basis of analyzing the relationship between the separation time and background traffic of the packet pair. This method breaks the constraint that the tense link and the bottleneck link must be the same link, and is able to measure the end-to-end available bandwidth, even in many complex...
The Ethernet PON (EPON), standardized by the IEEE Ethernet First Mile Alliance, is viewed by many as an attractive solution to deliver very high-speed broadband access. While downstream traffic is broadcasted to all customers, the access of upstream traffic to the fiber has to be arbitrated in order to avoid collisions. This is achieved by designing both a dynamic bandwidth assignment (DBA) that shares...
In grid computing, most of the SLA management systems focus on static SLAs, where the guarantee terms are defined as constants or bounds. None of them support dynamic SLAs based on analytical expressions. Therefore, to enforce dynamic SLAs and to improve services offered to applications, we propose a new monitoring method to control the resource utilization and to reconfigure them when necessary in...
Due to advantages in enough number of channels and favorable bandwidth, 2.4 GHz ISM band is used as the most prevalent band for the IEEE802.15.4 LR-WPAN. However, there are an increasing number of other devices and systems which may interfere with the IEEE 802.15.4 communication. Therefore, the coexistence issue is one of the most critical challenges for the IEEE 802.15.4. In this paper, we propose...
TCP constitutes the principal protocol of the TCP/IP model transport stack. Today, TCP-Reno is the mainly deployed transport protocol on Internet. It defines a method of controlling congestion in networks with packet switching and particularly the Internet. In spite of the efforts made to resolve the congestion problem, this protocol continues to meet numerous of troubles in particular in networks...
Multicast communication is an efficient method of data transmission and distribution among a group, especially when network resources are inadequate and needs to be shared. Fair share of network resources, such as, bandwidth, is desirable in such cases. Although there has been an intensive research effort to design protocols and construct multicast routing graphs for a single multicast group, construction...
This paper provides a first look at the potential for implementing a high-bandwidth air/ground (A/G) digital networked voice and data system in the very high frequency (VHF) band. The future communication study (FCS), a joint study performed by the Federal Aviation Administration (FAA) and EUROCONTROL, evaluated several systems and found the system called broadband-aeronautical mobile communications...
Header compression techniques theoretically can improve the speech quality of multimedia applications. However it introduces a new impairment directly related to the loss of packets, that can impact negatively on the quality. Its deployment over wireless mesh networks needs special treatment due to the usually high loss rates of such a network. This work shows an evaluation of an alternative approach...
IP multicast is a bandwidth efficient technology that can be utilised for one-to-many or many-to-many communications via satellite for aeronautical passenger communication. An AAA framework for multicast services was presented. The framework combines the GDOI multicast security protocol with AAA functionality enabling network providers to control access to multicast sessions and account the usage...
In this paper, we propose a TDMA slot assignment protocol that assigns slots to sensor nodes according to the skew of traffic load. Our protocol prevents the appearance of unassigned slots and utilize the channel effectively by adopting our previous slot assignment protocol that dynamically changes the frame length of each node. In addition, each node exchanges the information on traffic load with...
We analyze the fairness of bandwidth sharing between competing flows when the flows use different packet sizes. For systems where router buffers are defined in packets, we notice that larger packets get preferential treatment. Specifically, in networks, where a higher capacity link is followed by a lower capacity link, packet loss seen by streams with bigger packet size is smaller. We verify our findings...
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