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An efficient code holding technique for a wide-band code division multiple access (WCDMA) Internet Protocol (IP) access network is proposed, which reduces the number of codes required and allows bandwidth to be supplied on demand (BWOD). Performance is evaluated in terms of end-to-end delays for different multimedia applications.
An original method for predicting the performance of upcoming stratospheric communication systems is presented. The prediction is based on a physical–statistical model of the built-up channel, used in combination with existing models of the tropospheric mechanisms. The physical nature of the approach allows the statistics of fade and BER to be obtained as a function of any input parameter, such as the size of the target area, the platform height or the area characteristics. Simulations provide, for example, values of BER achieved over a certain percentage of area during a given percentage of time, as a function of the ground range right below the platform. Various system procedures, such as error correction and power control, are also investigated.
HIPERLAN/2 is a European-standard high-speed wireless local area network (WLAN) operating in the 5 GHz band. In order to support broadband multimedia communications, it can provide data rates up to 54 Mbps. The HIPERLAN/2 standard specifies a flexible radio-access network that can be used with a variety of core networks, including UMTS. It is likely that HIPERLAN/2 will become an important complementary technology to 3G cellular systems, typically used for `hot-spot' coverage. In this paper, the use of HIPERLAN/2 in conjunction with UMTS is discussed. Software-simulated physical layer performance results are presented and an evaluation given of the impact of the use of sectorised antennas at access points. Results are shown for statistical channel models and real channel measurements taken in both indoor and outdoor environments in the 5 GHz band.
It is essential for future mobile communication systems to support different media types such as audio, video. There is also an increasing need to preserve the confidentiality, data integrity, and authenticity of these media to prevent fraud. In this paper, modifications to the wireless application protocol (WAP) are proposed to enable real time voice and video transmission in future mobile communication systems through a secure communication protocol.
This paper addresses the problem of delivering reliable video information in a world with varying network capacities, an increasing demand in mobility, and frequent occasions of congestion or complete signal loss. A hybrid solution is proposed for the application of handheld wireless videophones with a prioritisation scheme of what information is important and what is not.
More and more people combine several purposes with travelling, such as business, leisure, entertainment, and education. Such people may not have time to pre-plan a travel schedule in detail. They need location-aware information about the destination domain and expect individualised information and services. The EU funded research project CRUMPET addresses these factors and will provide new information delivery services for a far more heterogeneous tourist population. The services proposed by CRUMPET take advantage of integrating four key emerging technology domains and applying them to the tourism domain: location-aware services, personalised user interaction, seamlessly accessible multimedia mobile communication, and smart component-based middleware or “smartware” that uses multi-agent technology.
