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.
In this paper, classical feedback control theory is used to contribute two types of QoS guarantees, relative delay guarantee ( RDG) and absolute delay guarantee (ADG). RDG aims to maintain the average queuing delay ratio between different classes of requests according to pre-specified parameters, and ADG aims to ensure the average queuing delay for requests with high priority is no more than the threshold...
In the communications of network, different RED parameters can be set to the WRED algorithm to suit for different levels of business, to reach the goal of differentiating the services. The package loss curve of the WRED algorithm is improved in this paper. Thus the throughput of the network enlarges and the rate of the package loss becomes lower. The improvement is testified by simulation of PTN network...
In wireless communication, it is enough to transmit the same information only once to reach a group of users due to the broadcast nature of wireless media. However, some users may fail to receive as a result of channel fading and etc. Cooperative communication can make use of space diversity to enhance communication quality. In this paper, we proposed a novel cooperative routing strategy for wireless...
Wireless multicast can exploit broadcast nature of wireless communication. It is sufficient to transmit information only once to reach a group of users. But some users may fail to receive it due to channel fading etc. Thus, we have to find a proper threshold of scheduling and retransmit in order to reduce the packet loss. In this paper, the multicast scheduling problem with packet loss and delay constraints...
It is because the resources are geographic distributed, heterogeneous and dynamic in computational grid environments that makes QoS guided scheduling a complex and challenging problem, especially when the tasks have multiple QoS needs. The economic model was applied to solve the resource allocation problem controlled by QoS in grid. Integration function is used to quantitative QoS, which aims to achieve...
We study the benefit optimization-based resource scheduling algorithm in three-dimensional QoS model in this paper. It is the management of economy model and the user alternation system provide QoS. The objective is to maximize the system benefit. An iterative scheduling algorithm used to maximize the QoS needs of users and resource scheduler is proposed to optimal three-dimensional QoS based resource...
A cross-layer design based on precoding and partial feedback for multiuser MIMO-OFDM systems is presented in this paper. First, we design precoder vectors with partial feedback in order to convert the MIMO channels into equivalent single-input single-output (SISO) channels. Then we can divide the radio resource into many space-time-frequency (STF) three dimension resource units. Then we present a...
It is because the resources are geographic distributed, heterogeneous and dynamic in computational grid environments that makes QoS guided scheduling a complex and challenging problem, especially when the tasks have multiple QoS needs. The economic model was applied to solve the resource allocation problem controlled by QoS in grid. Integration function is used to quantitative QoS, which aims to achieve...
A cross-layer design of packet scheduling and resource allocation based on beamforming for multiuser MIMO-OFDM systems is presented in this paper. First, we design beamforming vectors in order to convert the MIMO channels into equivalent single-input single-output (SISO) channels and choose the main SISO channel to transmit packets. Then we use a multi-strategy scheduler to schedule packets of all...
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.