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Since the lower power requirement of code division multiple access (CDMA) than that of other multiple access, the CDMA technology is suitable to be used in low earth orbit (LEO) satellite communication system whose space power is limited due to the small size of satellite. The pilot channel of CDMA technology is very important for earth mobile station (EMS) in LEO system to recover carrier and code,...
Mobile data offloading has become a promising approach to alleviate cellular traffic load. To motivate the third-party participants to offload data traffic, there arises a variety of market-based incentive frameworks for analyzing economic benefits. However, existing frameworks are mostly oriented to AP-based offloading through WiFi or femtocells, the economic incentive for opportunistic networks...
The paper presents a method of bridging the gap between GIF and HTML5 Video by providing both - allowing much faster content delivery and saved bandwidth. It's been over 25 years since the GIF format was introduced, and we've since then made significant progress in video compression. By converting GIF to video formats, you not only gain the possibility of user interaction, but you also reduce its...
In this paper, we study the cluster dynamics during network evolution in human mobile network by analyzing the GPS trajectories of taxi collected in two different urban environment. We observe that the size distribution of small clusters exhibits persistence over time, and the behavior of large clusters becomes the key to distinguishing the network state at different time step during the evolution...
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...
Mobile sensor networks comprise of mobile and static sensor nodes set up for the purpose of collaboratively performing tasks like sensing a phenomenon or monitoring a region. Sensor deployment is an important problem in mobile wireless sensor networks, which affects the performance and lifetime of the networks. This paper presents a distributed deployment algorithm for mobile sensors. Our algorithm...
A retrial queue with general retrial times, a modified vacation policy and server breakdowns is investigated in this paper. We study the embedded Markov chain underlying the considered queueing system and its stable condition. By applying the supplementary variable technique, some analytical results for the system size distribution as well as some other performance measures of the system are derived...
Ad hoc network is one sort of multi-hop, self-organization and dynamically changing network. The Ad hoc On-Demand Distance Vector (AODV) protocol is an on-demand protocol specialized for mobile ad hoc network. Future network should have cognitive characters and the collection of elements that make up the network observes network conditions and then, using prior knowledge gained from previous interactions...
In uneven ubiquitous computing environments, there exists no one design paradigm, such as client/server, code on demand, remote evaluation or mobile agent, which can do well in all types of contexts. Thus, it is an important task to evaluate the performances of these paradigms in various environments in order to select and use the optimal paradigm in the specified contexts. This paper analyzes the...
Mobile Augmented Reality (MAR) is an emerging visual computing application for the mobile Internet device (MID). In one MAR usage model, the user points the handheld device to an object (like a wine bottle or a building) and the MID automatically recognizes and displays information regarding the object. Achieving this in software on the handheld requires significant compute processing for object recognition...
In this paper a framework and cognitive process behavior model for a novel type of adaptive data network was proposed. Furthermore, access network selection and admission control mechanisms are integrated into a procedure defined as access control. The access control mechanism is based on cognitive process, and enables all network elements involved to achieve self-awareness, self-configuration, and...
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...
As integration of heterogeneous networks has become one of the most important characters for next-generation networks, it becomes a very challenging issue to ensure effective handoff when mobile node moves between different heterogeneous networks. In this paper we propose an effective handoff mechanism based on location information. By processing geographical data (consisting of information about...
In order to deal with the longer delay and extra cost arising from the combination of AAA(authentication, authority and accounting) and mobile Ipv6, a new hierarchical AAA mobility management architecture (HA-MMA) is proposed in this paper, which is comprised of root AAA servers (RAAAS), middle AAA servers (MAAAS) and leaf AAA servers (LAAAS). However, the authentication frequency will be increased...
According to the interworking authentication trends, this paper has proposed a novel reference of interworking AAA architecture among 3GPP, WiMAX and WLANs. Moreover, based on the proposed architecture, a hierarchy AAA mobility management architecture is brought forward, as well as a dynamic reorganizing management scheme authentication domain. Finally, the simulation results show that the total cost...
OFDM has become one of the most important Beyond-3G transmission technologies. Mobile WiMAX is a typical representative of OFDM systems. The cross-layer optimization problem of inter-cell coordinated resource allocation for OFDM systems is addressed in this paper. We first analyze the problem by utility-based method, and formulate this optimization problem. Then the globally optimal and a sub-optimal...
In order to avoid the problem caused by single point of failure of the root AAA (authentication, authorization, and accounting) server in hierarchical AAA mobility management (HAMM), a novel robust fault tolerant scheme for hierarchical AAA (RFT-HA) is proposed in Mobile IPv6. In this scheme, the period of detecting the root AAA server's (RAAAS) failure is decreased by adopting ICMPv6 and Diameter...
Method of representation for Web service self-adaptation strategy is studied. By this method, description logic is exploited to support the modeling of self-adaptation strategies. The framework of description logic-based adaptation strategy representation is presented with syntax and semantics. Examples are given to show the formalization of self-adaptation strategy. Furthermore, self-adaptation strategy...
This paper presents a novel FFT domain bandwidth extension algorithm and adapts the proposed algorithm to AMR-WB+ audio standard. The framework is given and key technologies are described in detail. It operates with low computational complexity compared to the bandwidth extension of AMR-WB+. The subjective quality test result is given showing the quality of proposed bandwidth extension combined with...
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