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As mobile devices and mobile applications largelygrow, mobile data traffic increases at an unprecedented rate. How to alleviate mobile traffic congestion becomes a widelydiscussed issue. Because that most mobile data is not necessarilyused immediately (e.x. update applications, download a largesize video, etc.), these data are allowed to complete transmissionbefore delay-tolerant deadline. In this...
The small cell deployment is seen as a promising solution for the network operators to help them cope with the increasing number of mobile broadband data subscribers and their bandwidth-intensive application demands. The result is a HetNet, heterogeneous network environment with a combination of macro-cells and small cells to spread the traffic load, increase the bitrates and maintain the service...
In heterogeneous network environment, it is important to choose an appropriate access network for a Multimode Mobile Terminal (MMT). Currently, there are some methods proposed to make network access selection decision. However, those methods didn't consider some dynamic attributes and could not offer effective handoff strategies. In this paper, we introduce an Intelligence Access Selection Scheme...
This paper presents a preliminary study of quality of experience (QoE) of VoIP that are provided as social network services using Perceptual Evaluation of Speech Quality (PESQ) with Thai and Chinese speech samples. This study focuses on VoIP quality of the free call feature from Facebook and LINE, which are the popular social network site and the popular social network application for Thai users respectively...
With increasing mobile data demand there is a push towards heterogeneous networks. Small-scale operators (SSOs) of WLANs are becoming more prevalent, while Mobile Network Operators (MNOs) seek an outlet for their customers' data usage. These conditions prompt the need for an effective relationship between the two parties for the purpose of offloading cellular data traffic to WLANs in a way that is...
Over the last few years, mobile wireless LANs (m-WLANs), which are characterized by portable access points (APs) and a small number of connected clients, are becoming popular. When a large number of such personal mobile APs operate close to each other, for example in crowded urban areas and conference venues, the quality of service (QoS) of the connected clients can be severely degraded due to co-channel...
This paper proposes a novel Time-threshold-based Dynamic Priority Scheme (TDPS) for vertical handoff in a cellular/WLAN interworking networks. In order to improve the non-prioritized Upward Vertical Handoff (UVH) call dropping probability while guaranteeing system performance, the proposed scheme defines dynamic priority for non-prioritized UVH calls and designs the newly bandwidth allocation scheme...
Even though various wireless Network Access Technologies (NATs) with different specifications and applications have been developed in the recent years, no single wireless technology alone can satisfy the anytime, anywhere, and any service wireless-access needs of mobile users. A real seamless wireless mobile environment is only realized by considering vertical and horizontal handoffs together. One...
This article explains the 3GPP-BBF interworking architecture using WLAN access or home (e)NodeB/femtocell access in order to go toward single network for policy and QoS convergence. The interworking architectures and schemes ensure that the customers get the same service via any access network. In addition, this article covers the mechanisms to support evolved packet core routed traffic and non-seamless...
This paper proposes a novel Time-threshold-based Upward Priority Scheme (TUPS) for vertical handoff in a cellular/WLAN interworking networks. In order to improve the newly blocking probability of cellular calls while guaranteeing system performance and utilization of the cellular bandwidth, the proposed scheme defines priorities for Upward Vertical Handoff (UVH) calls by using time-threshold values...
Next Generation Mobile Broadband Networks are designed to solve the large amount of expected mobile data traffic and to reduce the network costs at the same time. 3GPP has standardized the Evolved Packet System (EPS) in order to address such issues and provide connectivity, mobility, security and Quality-of-Service (QoS) on a connection between User Equipments (UE) and services through the access...
This paper proposes a novel upward priority channel Preemption Scheme (UPPS) for vertical handoff in a cellular/WLAN interworking networks. In order to improve the upward vertical handoff (UVH) dropping probabilities of voice and data calls while guaranteeing system performance and utilization of the cellular bandwidth, the proposed scheme defines priorities for newly cellular calls and UVH calls...
Due to the rapid and independent developments of systems, heterogeneity has become a common feature of current networks. In order to harmonize two different networks and close the gap between their technologies, we need to develop a good mechanism for network selection, and access that best satisfy user requirements. Many public areas (collages, airports, hotels...etc) have different systems for providing...
The network-centric CAC schemes try to do resource reservation into networks for mobile connections, observing network status only. This approach can be appropriate for non-real time traffic, but for real-time applications, hasn't showed good results. In this paper, we introduce the PI-CAC, a user-centric L3 CAC scheme, based on user quality of experience for integrating WLAN and 3G networks, with...
The primary responsibility of a medium access control (MAC) protocol in Ad hoc Network is the distributed arbitration for the shared channel for transmission of packets. The performance of Ad hoc Network depends upon the sincerity of the MAC protocol. The MAC protocol of this type of network should be distributed, faired & free from hidden and exposed terminal problem. It should also support real-time...
Efficient vertical handover mechanisms are required to provide service continuity over available and upcoming heterogeneous wireless access networks. They should provide low delays and good accuracy to meet service requirements. In the literature, proposed mechanisms rely on a rich knowledge of users' ambient environments and contexts. The outcomes are complex mechanisms that require significant amount...
This paper presents the key designing principles and attributes of a novel autonomic architecture for enabling efficient mobility and QoS-aware resource management over an integrated IPv6-enabled heterogeneous wireless environment (CDMA cellular/WLAN). The proposed architecture is founded on Generic Autonomic Network Architecture (GANA), a generic framework for realizing autonomic networks introduced...
A Vehicle Ad hoc Network (VANET) is composed of vehicles, with short range wireless communication capabilities. Vehicular networks can support both Vehicle-to-Vehicle and Vehicle-to-Infrastructure communications, and are targeted at the delivery of both road safety applications and non-safety applications, including comfort applications. Comfort applications aim to provide information and entertainment...
Multi-player online gaming is one of the most popular applications on the Internet nowadays. Due to the mobility requirements and the growing popularity of WiFi services, a significant number of users access the Internet through IEEE 802.11 Wireless LAN. Hence, the performance of highly interactive real-time online game under wireless environment is receiving attentions from researchers. In this paper,...
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