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Current large-scale computing services, such as online social networking and web searching, make the wired links in the data centers with an Ethernet infrastructure oversubscribed. Therefore, researchers consider to augment the data centers with wireless communication, called a hybrid data center network (HDCN), to improve the communication flexibility and network capacity. In this paper, we investigate...
Carrier Aggregation (CA) is one of the promising techniques to support the wider bandwidth and fulfil the higher data rate requirement in LTE-Advanced system. Combined with Cognitive Radio (CR), the packet scheduler is more intelligent to assign the radio resources dynamically. To the best of our knowledge, Carrier Scheduling (CS) scheme in the cognitive LTE-A system with CA has not thoroughly been...
In this paper, we propose an intelligent routing protocol for wide-area Ad Hoc network. This protocol was designed based on both the on-demand routing protocol and table-driven routing protocol. In our routing protocol, QoS guarantee mechanism was taken into consideration, and business was divided into three types and each type enjoys different service priorities. So it's an intelligent routing protocol...
In a service-based multi-tenant SaaS application, the number of servers on which Web service instances are deployed are limited, and tenants share the same application and services. With the purpose of lowering cost of ownership by high economies of scale, we must solve the problem that how to optimally place tenants with end users to maximize the total number of tenants without violating their Service...
With fast development of wireless network technologies, a variety of different wireless networks coexist in the future. We are getting more and more focus on convergence of heterogeneous networks. In the environment of heterogeneous wireless networks, traditional mobility management has already become incapable to support mobility in heterogeneous wireless networks. As one of the key function of the...
The cognitive routing can collect the network information, analyze the information and make the routing decision. A multi-strategy cognitive routing will choose the routing strategy adaptively by different network environment. In this paper, a cognitive multi-strategy routing with QoS constraint and load balance is proposed. If the payload of network is light, parameters of QoS performance, such as...
Realization of end-to-end Quality of Service (QoS) provisioning in a scheme plays a very important role in improving stability and quality of communication. Although simple data switching is possible between heterogeneous networks supporting different QoS signalling, end-to-end QoS provisioning can not be completed due to different rules in executing resource reservation. In this paper, a dual-stack...
In mobile ad hoc networks (MANETs), service composition faces severe challenges such as the lack of central server, node mobility and wireless network failure, which are usually not considered in web service composition on Internet. This paper designs and implements an on-demand service composition protocol for MANETs with consideration of quality of service (QoS). Based on the well-known Dynamic...
Because of user mobility, highly dynamic, error-prone wireless channels, the QoS control for mobile Peer-to-Peer (MP2P) streaming media has to face considerable challenges. Given to the advantages of policy management, we develop a policy-based QoS control (PBQC) architecture to provide QoS assurance dynamically and automatically in mobile network environment. And we also propose a MP2P streaming...
Roaming across heterogeneous wireless networks such as wireless wide area network (WWAN) and wireless local area network (WLAN) poses considerable challenges, as it is usually difficult to maintain the existing connections and guarantee the necessary end-to-end quality-of-service (QoS). This paper proposes a novel end-to-end QoS guaranteed seamless handover scheme, which can maintain the connections...
A novel adaptive scheduling with coordination for the performance improvement of delay-sensitive applications over heterogeneous wireless networks is proposed. It can bring such contributes i) adaptation capabilities at different layers of the protocol stack, and ii) the coordinated scheduling initiation procedure. It uses information from the physical layer and data link layer to determine the appropriate...
A cross-layer resource allocation and scheduling scheme in the downlink of MIMO-OFDMA systems is proposed to provide quality of service (QoS) guarantees to real-time traffics and non-real-time traffics in case of heavy-traffic. The proposed algorithm aims to maximize the efficient system throughput with the constraints of packet error rate, delay, packets dropping rate and buffer size. At the medium...
This paper proposes a distributed optimal relay selection scheme in wireless multi-hop cooperative networks where the wireless channels are modeled as first-order finite-state Markov channels (FSMCs) and adaptive modulation and coding (AMC) is applied. The FSMC model is used to approximate the time variations of the average received signal-to-noise ratio (SNR). The state of a relay consists of the...
The cognitive network, which is based on the theory of cognitive radio, is undergoing rapid growth. But the research on QoS provisioning for cognitive heterogeneous networks is scarce. In this paper, an end-to-end QoS provisioning model is proposed withthe cognitive process. QoS mapping of different cognitive QoS domains in SLSs and the related resource provisioning signaling are also expounded. The...
As the existence of diverse network technologies, QoS signaling is needed to guarantee the end-to-end QoS for users in complex network environment. Compared with the previous QoS signaling with resource reservation, NSIS (next steps in signaling) proposed by IETF is better in flexibility and scalability. This paper proposes a new mobility-aware scheme for QoS NSLP (NSIS signaling layer protocol) in...
Multi-radio access selection (MRAS) is a key issue to obtain performance improvement in heterogeneous wireless networks. MRAS can affect the users' QoS directly, as well as the resource allocation and load balance for networks. In this paper, a universal MRAS decision model was set up by multi-objective optimization methods. Parameters from upper layer and lower layer related with network selection...
An adaptive resource allocation scheme for QoS oriented OFDMA system, which schedules two different utility functions for the Real-time/Non Real-time traffic simultaneously, is proposed in this paper. Instead of partial consideration of uniform kinds of QoS, we introduce an updating ratio factor to schedule users of heterogeneous traffic. Due to the complex optimization objective, the general convex...
Call admission control is an essential approach for traffic control and QoS provisioning. Compared with the single network, it is quite complicate for multi-service heterogeneous wireless networks. In this paper, a hierarchical joint call admission control HJCAC is proposed. The framework of the scheme, new introduced messages format and service access procedure is also designed in this paper. Simulation...
Due to lack of effective trust management mechanism, there are a lot of deceptive behaviors in P2P networks, which seriously decrease the quality of network services. In order to improve the quality of services (or transactions), this paper proposes a novel trust and reputation model based on similarity evaluation in P2P environments. According to the different context of services, the model gives...
Wireless self-organizing network including WiMAX (worldwide interoperability for microwave access) mesh networks can provide effective communication in pervasive computing environment. To resolve the problem that WiMAX Mesh network lacks QoS (Quality of Service) guarantee mechanism, a novel resource reservation mechanism used in WiMAX mesh network is proposed. This mechanism uses existing service...
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