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This paper investigates the energy efficiency (EE) of distributed antenna system (DAS) with continuous-rate adaptive modulation (CAM) under different quality of service requirements, and develops adaptive power allocation (PA) schemes for DAS. Firstly, the EE for DAS with CAM is presented. By maximizing the EE subject to the maximum transmit power, target bit error rate (BER), and minimum spectral...
QoS prediction is the most important step in web service selection and service recommendation. In the field of service computing, the most frequently method that adopted to predict the web service QoS is collaborative filtering. The existing studies usually focus on the prediction of the exact QoS values, and never prediction about its fluctuation range which is caused by the random dynamic nature...
This paper aims at systematically analyzing the pricing schemes in data center network. The interaction between a monopolistic operator and customers in the network is modeled as Stackelberg game. In this model, both homogeneous- and heterogeneous-customer scenarios are analyzed. In homogeneous customer case, a special scenario is that only a single customer exists in the network. In this scenario,...
In this paper, we investigate call admission control (CAC) with opportunistic scheduling and propose a novel CAC algorithm for users with quality of service (QoS) requirements. Our main contribution is threefold. First, we verify that, compared with several other scheduling schemes, cumulative distributed function based scheduling (CS) makes the best tradeoff between efficiency and fairness in full-load...
Active queue management (AQM) mechanism is a powerful method, which aims to assist the TCP congestion control and to improve the trade-off between queuing delay and link utilization. Traditional price-based AQM algorithms suffer from sluggish response, poor robustness, and lack adequate adaptability against dynamic traffics. To improve AQM performance, this paper introduces artificial intelligence...
The TCP/AQM dynamics is modeled as a time-delay congestion control system, in which the round trip time (RTT) has great influence on the system stability and network performance. Most of the existing active queue management (AQM) algorithms suffer from performance degradation, and fail to provide quality of service (QoS) when the RTT delay becomes remarkable. To address the problem, we present an...
For advanced per-flow service disciplines at high-speed network links, it is essential to maintain priority queues in sorted order. The scalable priority queue implementation requires managing a large number of queues at ever increasing line speeds. In this paper, we propose novel solutions to the management of priority queues using a previously proposed pipelined Counting Priority Index (pCPI) structure...
In this paper, we investigate load balancing problem in 3GPP Long Term Evolution (LTE) networks and propose our solution which considers users with different Quality-of-Service (QoS) requirements. Load unbalance among neighboring cells often yields negative impacts on user experience and network performance, and it has mainly been considered for only data services without QoS guarantee. However, 3GPP...
In this letter, we investigate call admission control (CAC) for cumulative rate distribution based scheduling (CS) in wireless communication networks. We first analyze the multi-user diversity gain (MDG) of CS, which is applicable to general channel conditions. Then we propose the minimum rate guaranteed CS/ORR based CAC algorithm, COCAC, which jointly uses CS and opportunistic round robin (ORR) for...
Most of the existing congestion control schemes cannot guarantee the quality of service in wide-area networks with large round trip time (RTT). Aiming at the above problem, a two-degree-of-freedom congestion control strategy (named TCC) is proposed for improving the stability and robustness of the TCP/AQM system. TCC employs a modified Smith predictor with two additional controllers to compensate...
It has been shown that a quasi-orthogonal space-time block code (QOSTBC) provides full transmission rate for four transmit antennas [3]-[5]. However, one of the QOSTBC's main disadvantages is high decoder complexity due to the channel interference terms in detection matrix. In this paper, we propose two improved decoder schemes to reduce complexity at the decoder. Our decoder schemes can fully eliminate...
In order to improve quality of service (QoS) of wireless environment in scene-based mobile social network service (mobile SNS), a novel prefetching method is proposed in this paper. Utilizing this method, prefetching decisions are made based on the relationship among users and access histories recorded in the client. When the user is viewing the scene or other components, client is allowed to prefetch...
A practical scenario to realize Ad hoc network based on the Linux operation system is proposed in this paper. A practical test network composed of several nodes is built and DSR (Dynamic Source Routing) protocol is selected to run on the test network. Meanwhile, in order to obtain better support for real time multimedia services, an improved DSR protocol considering delay demand is also testified...
Load balancing among multi-cells in 3GPP Long Term Evolution (LTE) networks with heterogeneous services is investigated. It is formulated as a multi-objective optimization problem, the objectives of which are load balancing index of services with QoS requirements and network utility of other services. The constraints are physical resource limits and QoS demands. Then the property and complexity of...
In order to ensure the quality of broadband service in cellular networks, bandwidth resources are required more and more. But the wireless bandwidth resources in a cell are limited and fixed. A QoS-adaptive bandwidth allocation scheme based on measurement report real-time analysis is presented in the paper. It makes use of the measurement report frames and normalized QoS level to maximize the weight...
A network measurement and feedback scheme (MFS) for call admission control channel and resources predictive control in cellular networks is presented in the paper. MFS enhances the wireless resource utilization rate in cellular networks. Compared with normalized resource reservation schemes, MFS reduces the call dropping probability (CDP) and call blocking probability (CBP). Moreover, considering...
To meet the business and user requirements, it is crucial to manage the quality of service (QoS) of composite Web service. Due to the dynamics nature of the Web services, the runtime behavior of Web services is likely to differ from the initial estimated one. Therefore, a re-planning to adapt the composite service to the QoS violated services, ensuring the global constraints and preferences will be...
A new variable bandwidth scheme (VBS) for channel resources predictive control and call admission control in cellular networks is presented in the paper. VBS mainly aims to the QoS enhancement of cellular networks. Compared with the time-based channel predictive control (TCPC) schemes, VBS has a good performance in call dropping probability (CDP) and call blocking probability (CBP). Moreover, considering...
One of the major problems of deploying RSVP in the mobile environment is called the advanceresourcereservation problem. If an RSVP reservation path is reserved in advance in the subnet that a mobile node will visit, the mobile node can continue its QoS session smoothly when it hands over to that subnet. However, if too many network resources are used for advance reservation, new QoS sessions originating...
Augmenting web services with explicit semantics forms the foundation of Service Oriented Architectures (SOAs) automation. As more and more Semantic Web Services (SWSs) are deployed, similar SWSs could have quite different quality-of-service (QoS) levels. The QoS-aware discovery becomes an important challenge. While some efforts try to solve it via Constraint Programming (CP), they suffer from the...
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