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As the outsourcing of mobile sensitive data has been highlighted, data encryption schemes are required to protect the mobile sensitive data. Accordingly, it is necessary to develop not only a distributed index structure to efficiently manage the large amount of encrypted data, but also a query processing scheme over the encrypted data. To the best of our knowledge, there has been no research on index...
In this paper, we introduce MVPN, a framework for building secure Virtual Private Networks (VPNs) with a novel Mobile IPv6 based Moving Target Defense strategy. Our approach aids in combating remote attacks against a VPN server. By eliminating the static address of the server, we make it difficult for an attacker to find the server. The server''s address is randomly changed at a certain interval creating...
Multicast services need to satisfy all mobile devices even under very bad channel conditions. However, the method for accommodating this will result in the throughput of the service being determined and limited by the channel state of the mobile device with the worst channel conditions. In this way, the capacity of mobile devices under a good channel state is determined based on the capacity of the...
Typical mobile P2P protocols largely relied on inflexible techniques such as, flooding, replicating, random walks and selective forwarding to route queries and discover objects of interest, which incur a relatively high search time due to remarkable network traffic, multiple copies and duplication of query messages. Recently proposed P2P protocols are able to reduce search time but due to peer mobility,...
This paper describes the design and implementation of MBS (multicast & broadcast service) server for mobile IPTV service in WiMAX networks. Based on interoperability requirements of WiMAX networks, the presented MBS server was implemented for mobile IPTV services and basically provides MBS service announcement and session management functions, dynamic MBS zone management, and MBS data transmission.
In this paper, a novel prefix-based patching algorithm named DP2 (Dynamic Prefix-based Patching algorithm) is proposed for mobile IPTV service in the WiBro system. Proposed algorithm increase the resource utilization of wireless bandwidth and server. It uses the prefix caching in proxy server to batch those requests that demand the same video. This algorithm just requires the mobile terminal can receive...
The multicast broadcast service (MBS) is introduced in WiMAX for the demand of real time multimedia services in mobile networks. To enhance the performance of MBS, an MBS zone is constructed in IEEE802.16e system. An MBS zone consists of several adjacent BSs. In this paper, a novel scheme is proposed for energy efficiency of MBS zone in WiMAX system. The MBS channel will be terminated for the BS in...
The main purpose of this paper is the functional design of BM-SC (Broadcast Multicast Service Centre) to support IPTV. BM-SC is newly defined by 3GPP/LTE to support delivering IMS (IP Multimedia Subsystem) over wireless broadband network. Delivering Mobile IPTV (Internet Protocol Television) over LTE (Long Term Evolution) network is requires more complex and more flexible functional operation. A functional...
In a multicast service, even though one of mobiles is in a very bad channel condition, it is certainly needs satisfying the mobile which joins the service. However, the way to accommodate it results that the throughput of the service is decided and limited by the channel state of the worst mobile. So the capacity of mobiles with good channel states is determined by the worst mobile. For overcoming...
To provide high quality of multimedia service in mobile environment, mobile IPTV service technology that enables higher reliability of transmission quality and multimedia service to many subscribers has been developed. One of the important technologies for mobile IPTV is to mitigate interference. This can be done by the configuration of MBS zone. 3GPP/LTE and Mobile WiMAX support MBS technology to...
With the development of wireless communication technologies and popularity of smart phones, many people are using location-based services (LBSs). However, since users continuously request queries to LBS server by using their exact locations, their privacy information is always in danger. Because the existing techniques provide user's privacy protection operating on centralized system, an anonymizer...
Recently mobile IPTV service becomes primary service to boost sluggish IT industry. SVC service seems to be prominent to satisfy the QoS/QoE in broadcasting service. Especially in multi-screen service, there are many different type of terminal. Therefore contents operator will apply SVC coding scheme to provide appropriate quality of image to users according to multi-terminal type. In order to provide...
As the interests of broadcasting services in mobile networks are increased, the research of convergence services of broadcasting and communication has become popular. To support broadcasting services in cellular network smoothly, WiBro support the multicast and broadcast service (MBS). MBS is transmission method that base stations belong to same MBS zone transmit the data to all users who request...
Recently mobile IPTV service becomes primary service to boost sluggish IT industry. Also 3D image seems to be more prominent in broadcasting service. Therefore 3D image service over mobile IPTV service network will appear as key converging telecommunications and broadcasting service. In order to provide 3D image in wireless access network, it's necessary to enhance the capacity of wireless access...
In this paper, we proposed enhanced receiver algorithm for obtaining macro diversity gain in MBS environment. The main idea is from diversity technique of MIMO system. Proposed algorithm improves receiver performance using space-time/frequency block code. The advantage of proposed method do not need additional antennas. Also, the performance is enhanced than previous configuration defined as next...
For converged technology both broadcasting and communication, currently mobile IPTV is focused on portable broadcasting system with users' feedback. To implement mobile IPTV based on mobile communication, the MIMO technique is necessary due to increasing capacity and applying different modulation ratio. In this paper, we proposed decision vector. The decision vector improves system performance by...
It's necessary to enhance the capacity of wireless access network to provide mobile IPTV service. In this paper MMR(Mobile Multi-hop Relay) system is introduced to increase the performance of mobile system based on IEEE 802.16m which introduced network coding technology to increase the performance of radio link. Radio link quality and mobile terminal throughput are analysed by simulation when RS(Relay...
Currently, the multimedia stream service provided by broadband wireless networks has emerged as an important technology and attracted much attention in the research of mobile IPTV which provide common content or program to multiple subscribers by using IP multicast service. Multicast and broadcast services (MBS) are described in the mobile WiMAX standard. The Qualnet network simulator is a more prevailing...
In mobile ad hoc networks, node's free movement is one of the most outstanding features. Due to mobility, link failure happens frequently so several communication problems such as low successful packet delivery ratio and large control overhead are naturally brought. However, node's mobility may bring dynamic situation, for example, distance between source and destination becomes closer or mobile node...
In this paper, a distributed mobile relay power control (DMRPC) scheme for maximizing individual cell throughput is proposed for mobile relay station (MRS) aided system. In the system with DMRPC, the power levels of MRSs are controlled by individual cell without cell cooperation and signaling overhead, and the appropriate power levels of MRSs are selected to maximize the cell throughput of their individual...
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