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We present an algorithm for bandwidth allocation for delay-sensitive traffic in multi-hop wireless sensor networks. Our solution considers both periodic as well as aperiodic real-time traffic in an unified manner. We also present a distributed MAC protocol that conforms to the bandwidth allocation and thus satisfies the latency requirements of realtime traffic. Additionally, the protocol provides...
This study approaches a two-dimensional rectangular plane figure mathematically in order to improve a calculating method for a numerical value concerning the volume of inflow information based on all related items such as the traditional traffic input ratio measurement method, the width of network broadband, and transfer speed, as an information flow; thus, it deduces a ratio formula that calculates...
In this paper, a generic framework for dynamic bandwidth management of SDH resources is proposed in context of Unicast NGN service solutions. This avoids major up-gradation of existing network while obtaining maximum benefits from existing protocols and design practices. Mechanisms of traffic monitoring and hierarchical address allocation are also proposed.
The growing popularity of wireless sensor networks (WSNs) lead to the shifting of research focus from WSNs to wireless multimedia sensor networks (WMSNs). Most existing routing protocols for WSNs do not satisfy the need of continuous and higher data rate routing requirements of WMSNs. In this paper a new routing protocol (LEAR) for WMSNs has been proposed which establish routing paths based on node...
Many industrial and medical scenarios today are building on mobile devices as their end systems. These devices are typically connected to backend systems via the mobile phone network with their corresponding data services. Today's network protocols are optimized for reliable transfer of voice traffic, however, available bandwidth and latency for data traffic may vary significantly with location and...
In this paper, in a laboratory environment, the performance of four network traffic generators (Iperf, Netperf, D-ITG and IP Traffic) are compared. Two computers with Windows operating systems were connected via a 100 Mbps link and for various payload sizes, ranging from 128 Bytes to 1408 Bytes, the TCP traffic on the link was measured using the various monitoring tools mentioned above. The results...
This paper proposes a simple path diversity algorithm (SPDA) for Interdomain routing. The SPDA uses source routing to find an alternate path from a source to a destination, and allows flexible division of traffic over the best and alternate path. The SPDA comprises three steps. First, the BGP protocol is extended to allow the BGP routing table to save the multiple paths for any destination. Second,...
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...
In mobile P2P systems over 3G cellular networks, traditional peer selection algorithms with the idea of traffic localization are not suitable due to the architecture and characteristics of 3G cellular networks. In this paper we propose a novel peer selection algorithm named CFPL for mobile P2P systems over 3G cellular networks. By taking not only the available uplink bandwidth of peers but also the...
A select number of missions supported by NASA's Deep Space Network (DSN) are demanding very high data rates. For example, the Kepler Mission was launched March 7, 2009 and at that time required the highest data rate of any NASA mission, with maximum rates of 4.33 Mb/s being provided via Ka band downlinks. The James Webb Space Telescope will require a maximum 28 Mb/s science downlink data rate also...
This paper proposes a learning approach to solve adaptive Connection Admission Control (CAC) schemes in future wireless networks. Real time connections (that require lower delay bounds than non-real-time) are subdivided into hard realtime (requiring constant bandwidth capacity) or adaptive (that have flexible bandwidth requirements). The CAC for such a mix of traffic types is a complex constraint...
Femtocells are an inexpensive solution to address weak indoor cellular coverage. Femtocells increase network coverage, offloaded macro cell sites, and provide high data rate services in a cost-effective manner. However, several aspects of this new technology are ambiguous or not defined in standard, such as QoS architecture, bandwidth request management and subscribers flows priority. This paper provides...
When a mobile host transmitting real-time video traffic using DCCP CCID3 moves between two wireless LAN access points with different congestion situations, it is difficult to quickly change the transmission rate according to the changes of communication environment because controlling the sending rate depends on feedback information. To solve this problem, we recently proposed a predictive rate control...
One of the most popular applications of IEEE 802.16 network is to serve as a backhaul service for IEEE 802.11 networks. However, the traffic of an IEEE 802.16 connection aggregated from IEEE 802.11 networks fluctuates. Thus, efficient bandwidth reservation at the subscriber station (SS) is an importance issue. This study proposes a simple and flexible bandwidth reservation scheme at the SS, called...
This paper studies the problem of non-cooperative joint channel and bandwidth allocations in multi-radio multichannel wireless networks. Existing works only studied non-cooperative multi-radio channel allocation and they did not consider two important issues, impact of traffic load to channel's transmission quality, and difference of bandwidth demands for different node pairs, which may have significant...
It has been clear for a long time that P2P applications represent a large proportion of the load on the network infrastructure. This is why significant research efforts have been devoted to reducing this load, in the form of ISP friendly P2P solutions. These solutions focus on the volume of the traffic as opposed to the number of network flows. At the same time, we are witnessing a great demand for...
In order to urge an optical TDMA network to be recommended as a LAN/MAN protocol, traffic-control approaches capable of improving performance on optical TDMA networks must be developed. This paper explores how to apply the unused bandwidth to enhance the performance of a middle-load TDMA network. The tight and loose traffic-control approaches are used to explore how to improve performance. The loose...
The Quality of Service (QoS) support of multimedia services over wireless Mobile Ad hoc Networks (MANETs) is one of the hottest challenges facing todays research community working on this area. Most existing works on QoS in ad hoc networks has been carried out under the assumption that the underlying QoS architecture is reservation based. In such architecture, mobile nodes maintain per-flow state...
Multi-rate multi-channel multi-radio wireless mesh networks (WMNs) have emerged as the next generation wireless mesh communications due to the availability of cheap, off-the-shelf IEEE 802.11 hardware. However, in a multi-rate IEEE 802.11 network, transmission over low rate links consumes disproportionally more time and resources as compared to that of high rate links. This performance anomaly occurs...
The extensive growth of peer-to-peer video applications (P2PTV) indicates the evolutionary path towards the next generation of networking. To enhance the quality of experience for P2PTV users, new P2P video traffic models are required. These models are often developed by measurement-driven performance modeling based upon statistical analysis. However, this type of analysis can be a challenging task,...
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