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Considering that the current information content being exchanged is increasingly multimedia, it is quite natural to the demand for a relatively short time downloading or to a certain extent uploading large information files to the Internet. Mobility is increasingly demanded along with broadband. Certain to locations do not have the necessary infrastructure for broadband. Users that are residing in...
Mission Critical Communications and Services are of a special nature that needs special requirements. Therefore, there are many challenges that face implementing mission critical communication system over commercial mobile communications networks. Signaling of SIP messages in the access technology domain and IMS domain needs enhancement to ensure meeting the mission critical service requirements....
In this paper we are given concept of our WiMAX (Worldwide Interoperability for Microwave Access) network performance for QoS monitoring and optimization solution for BS (Base Station) with multimedia application. In the communication sector, the optimal objective is to equate quality and cost. Due to its large coverage area, low cost of deployment and high speed data rates. WiMAX is a promising technology...
The following topics are dealt with : computer networks; IP networks; optical transmission; ATM networks; WDM system; wireless LAN; high speed Internet; ad hoc networks; wireless sensor networks; heterogeneous networks; bluetooth technology; personal communication system; broadband communication; 3G and 4G networks; multimedia communication; CDMA system; OFDM technology; communication protocol; spread...
This paper presents the topology of a multimedia tourism service that targets mobile devices with broadband and broadcast access capabilities. The solution adopted relies on existing mobile TV standards, but introduces features that enable the provision of generic multimedia services on top of hybrid mobile networks.
Communication technology has advanced significantly over the last decade enabling people to communicate anytime from anywhere using a multiplicity of devices. However, the power of this advancement in communication technology has hardly been leveraged in healthcare industry. This paper describes a solution that not only leverages the advancement in communication technology to streamline the process...
Current IMS development follows the path of improving the IMS clients and client frameworks. This paper points out the shortcomings of this path for deployment in a mobile-fixed convergent multi-access IMS environment. Instead of continuing the development on IMS client frameworks, an alternative path forward using IMS client widgets is proposed as a novel concept. It involves a thin-client solution...
This paper deals with increasing requirements for network intelligence (NI) and the technologies that generate it. NI is the basis for applying policy and differentiating charging capabilities, which are driven by the need to monetise the record growth of mobile broadband data. Nl is gathered by various techniques from evolving network functions, LTE (long term evolution) and IMS (IP multimedia subsystem)...
• Mobile WiMAX for the time being still in an optimizing phase concerning client adapters • Fixed WiMAX shows pretty good performance at up-and downlink rates • News gathering possible in a reasonable quality • Increase of topicality thanks to independence of site • Easy to use for VJ (Laptop + directional antenna) • WiMAX currently not yet implemented as a Broadcast-or Multicast-medium
Wireless landscape in the U.S. is very unique where both GSM/UMTS and CDMA/1xEV-DO technologies thrive. With emergence of mobile broadband access technologies such as WiMAX and LTE on the horizon, major U.S. operators all have announced their strategies for path forward to remain competitive in the mobile service market. In parallel, the IP multimedia subsystem (IMS) has firmly taken its position...
WiBro (Mobile WiMAX) is a broadband wireless internet service supporting for fixed, portable and mobile users, but enhancement of service quality in indoor environment is still necessary. WiBro femtocell is developed to expand cell coverage, increase system capacity and offer various multimedia service with high throughput in indoor environment. Three types of femtocell are designed according to the...
The rapid growth of high-speed multimedia services for mobile, residential and small business customers has created an increasing demand for last mile broadband access. The wireless broadband connectivity to the Internet is becoming increasingly available as an alternative to traditional wired technologies in cities across the globe and have the potential to fulfill the vision to high-speed broadband...
The European Telecommunications Standards Institute (ETSI) is currently specifying standards for broadband satellite multimedia (BSM). This paper presents an overview on a possible mobility management (MM) architecture for BSM, where satellite independent access function (SIAF) for handover are defined over the SI-SAP interface to enable upper layer access to lower layers and to connect SIAF with...
Considering the high packet losses and low, varying bandwidth of GPRS/EDGE network and limited computation power of handheld devices, we present and implement a novel SVC video-on-demand system for hand-held devices over GPRS/EDGE network. For the purpose of handling varying bitrate, we propose a priority based layer switching (PLS) adaptation scheme for SVC stream, which not only performs online...
Combining the multicarrier (MC) technique with the vertical Bell labs layered space-time coding (V-BLAST), the MC V-BLAST system can better meet the demand of the next generation broadband mobile multimedia communications. This paper proposes a blind channel estimation algorithm for the MC V-BLAST system under the frequency-selective fading environment. A rotation invariance property in the received...
A scheme that exploits the broadcast nature of the wireless communication in order to achieve multicast content delivery is presented in this paper. As opposed to broadcasting, this method enables the clients to determine on-line the delivered content, and thus preserves the advantages of an individual service. On the other hand, a multicast content delivery is much more efficient than a unicast content...
Todaypsilas access network is migrating towards broadband IP, fixed/mobile convergence and service convergence. Thus, the next generation access network (NGAN) requires a converged optical/wireless access network infrastructure, other than the existing architecture that connect to the cellular, broadband wireless, and optical access networks separately, which complicate the network and increase the...
This paper explores the attributes, layering models and objective functions in cross layer designs for mobile ad hoc wireless networks by taking all the statistical characteristics and constraints from the physical (PHY) layer, media access control (MAC) layer and network (NET) layer into consideration. This paper reviews the entire network optimization across all the PHY/MAC/NET layers. At the PHY...
Correlative minimum shift keying (MSK), a second order polynomial modulation scheme known as tamed frequency modulation (TFM), is a constant envelope type of modulation with a perfect peak to average power ratio (PAPR), besides the property of low out of band power. We apply the linearized TFM to the single carrier transmission with frequency domain equalization (SC/FDE) concept. We then obtain a...
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