The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Multi-channel multi-radio wireless networks improve network performance by enabling more simultaneous transmissions. Among multi-channel multi-radio protocols, the hybrid multi-channel approach has been shown to be efficient in providing higher system throughput. Voice over internet protocol (VoIP) service is expected to be widely supported in wireless networks, though its capacity has not been studied...
In this paper we propose a novel self-organizing resource allocation scheme with minimal feedback information based on minority game (MG). Designing wireless protocols with minimal feedback is especially important, because the price for information exchange in wireless networks is high and reduces the overall capacity of the system. This is especially true for networks that may rely strongly on self-organizing...
Quality communication over the wireless channel is now promised because of the advent of the broadband wireless. High speed data access is expected to be provided to subscribers through broadband wireless access. We propose a joint Call Admission Control (CAC) and Bandwidth Allocation (BA) for an IEEE 802.16 based WiMAX system. The presented schemes aim to provide QoS support along with a fair resource...
The congestion control scheme plays a critical role in the multicast communication. Without a proper congestion control mechanism, multicast protocols would cause unfairness while sharing network bandwidth with other flows. We propose a deliberated congestion control scheme to multicast multimedia contents for smart phones retrieving effectively. Our key idea is to detect the single trip time of packet...
The performance of traditional TCP congestion control protocol degrades when congestion and contention increase in ad hoc networks that use the IEEE 802.11 DCF. Many of the problems result from medium contention at the media access control (MAC) layer. In this paper, we present a new contention-based congestion control (CBCC) method according to a novel congestion information from MAC layer. This...
We propose an algorithm to choose a reasonable backoff window based on prediction of the congestion of downstream and upstream nodes. The algorithm listens to the number of consecutive idle slots of the wireless network, then calculates the congestion and feeds it back to the downstream node and upstream node. When sending packets, a reasonable backoff window is chosen, depending on downstream and...
In order to improve transmission throughput of a multi-hop wireless network, many efforts have been made in recent years to reduce traffic and hence transmission collisions by constructing backbone networks with minimum size. However, many other important issues need to be considered. Instead of simply minimizing the number of backbone nodes or supporting some isolated network features, in this work,...
Applications involved with multimedia streaming are blooming with the development of Internet and wireless networks. In this paper, we address the problem of how to jointly leverage power control and rate allocation to achieve high-performance video streaming with strict delay and energy over wireless ad-hoc networks. We focus on media-aware rate allocation and power control with goal of minimizing...
Real time network applications require effective mechanisms for managing Internet traffic in order to avoid or at least limit the level of congestion. We propose, design and analyze an Active Queue Manager (AQM) for controlling jitter using robust control theory. We used an output feedback controller and this controller is based on discrete-time model of TCP. The natural properties of robust controller...
In this paper, we present a method to optimally manage the access slots for the initial ranging contention process in IEEE802.16e air interface. In conventional method, the number of the initial access slot is fixed to a large number in common circumstance. The reason using the static large slot is to reduce the initial access collisions by slot contentions of the mobile terminals. Therefore the usage...
We investigate the power control policy which minimizes the average transmit power subject to delay quality of service (QoS) constraints for continuous and discrete constellation multi-level quadrature amplitude modulation (MQAM) schemes. The problem is formulated based on a cross-layer framework. In the framework, the queue at the data link layer is serviced by the power control and modulation schemes...
New emerging technologies like Multimedia applications require timely delivery of information as compared to reliability. The most widely used protocols over transport layer are Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). Both of these have some drawbacks while using in real time applications. TCP increases delay in transfer of data but achieving reliable transfer of data...
This paper proposes a new TCP congestion control algorithm (TCP-MS) that works better with media streaming applications in terms of network bandwidth utilization, fairness and traffic smoothness. Different from traditional TCP congestion control algorithms that estimates congestion by packet loss or queuing delay, TCP-MS estimates congestion by packet acknowledgement speed and adjusts window per round...
The transmission control protocol (TCP) provides reliable transport services between end-points and enjoys predominant share as carrier of data traffic over Internet. Last mile wireless links have challenged TCP effectiveness because of fluctuations in link quality and relatively low data rates. These fluctuations cause major performance degradation in terms of reduced throughput, increased retransmission...
Transmission rate adaptation in wireless devices provides a unique opportunity to trade off data service rate with energy consumption. In this paper, we study optimal rate control to minimize transmission energy expenditure subject to strict deadline or other quality-of-service (QoS) constraints. Specifically, the system consists of a wireless transmitter with controllable transmission rate and with...
IEEE 802.16, a standard for wireless MAN broadband access technology, provides a flexible QoS mechanism in MAC layer for wild variety classes of services. However, it fails to define specific admission control strategy and scheduling algorithm, therefore, those aspects about QoS guarantee mechanisms are becoming the research hotspot in recent years. In this paper, focusing on the features of services...
End-to-end delay and loss probability are two important parameters for evaluating the performance of multihop ad hoc networks. One of the main reasons for increasing the value of those parameters; is the buffer management scheme in the intermediate nodes. The number of hops that the packet traversed is not taken into account in most existing buffer management schemes. Dropping a packet which traversed...
Stability and fairness are two design objectives of congestion control mechanisms; they have traditionally been analyzed for long-lived flows (or elephants). It is only recently that short-lived flows (or mice) have received attention. Whereas stability has been established for the existing primal-dual based control mechanisms, the performance issue has been largely overlooked. In this paper, we study...
One of the vital key elements for providing quality of service (QoS) for VoIP is the call admission control (CAC) capabilities of the session management/call session control function or gateway. Even though the network may be designed to meet a given performance and restoration objective for the engineered traffic loads, the actual traffic may be significantly higher. Without a CAC function in a VoIP...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.