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Reconfigurability covers all levels of a system, ranging from radio level up to the services; this flexibility requires, also, a shift of responsibility. The paper analyses the issue of network resident support services for reconfigurable systems; it delivers a description of the complementary mechanisms for the provision of reconfiguration support services. These mechanisms are embedded in the Mobile VCE (Virtual Centre of Excellence) reconfiguration management architecture (RMA) (see Moessner, K. et al., UK Patent Application No. 0028463.8, 2000) and form the RMAs network part that is represented in the functionality of the AcA (authentication/authorization, virtual configuration, accounting/billing) server. This server incorporates and implements all aforementioned network reconfiguration support services and its functions are described.
This paper presents simulation aspects of the standard satellite universal mobile telecommunication system (S-UMTS) air interface and the generic models used for the simulation of the physical layer. It is very important to validate the accuracy of the individual models before combining them. Therefore, a full description of the important models for parameters such as modulation, encoding, interleaving and rate matching is presented, together with the performance comparison with the theoretical/expected results. Having justified the accuracy of these models, a complete physical layer is then developed by combining these individual models. A system corresponding to the satellite wideband code division multiple access, SW-CDMA (as proposed for S-UMTS standardisation by the European Space Agency, ESA), with suitable modifications, has been considered as a reference system. Performance evaluation of the proposed adaptive physical layer was carried out in a lightly wooded environment. The average BER of 6.4×10-4 is less than our target of 10-3. In addition, throughput was improved from 35 kbps (conventional system) to 44.5 kbps (adaptive system). (5 pages)
The demand for global telephony services for mobile users requires the use of constellations of non-geostationary orbits. The proposed S-PCNs are Iridium, Inmarsat-P, Globalstar, Odyssey and Ellipse. The first two systems propose to use a time division multiple access (TDMA) scheme and the others code division multiple access (CDMA) scheme. It is claimed that CDMA based S-PCNs can share the allocated frequency bands due to the interference resistant property of CDMA. Spectrum sharing must be based on defined interference criteria being satisfied. The interference events are based on the statistics of the C/I. For this a computer simulation was developed to model the dynamic nature of any constellation, and produces all the statistical values of the C/I to a mobile in a fading channel. The simulation includes constellations the results of proposed S-PCNs with multi-spotbeam antennas (MBA). We present the results of the investigation on the effect of totally overlapped band sharing on the bandwidth utilisation and resultant capacity and compare this capacity with that of a band segmentation approach. Computed values of the C/I in totally overlapped band sharing and segmented band sharing scenarios are translated into the system capacity. The results lead to specific criteria which must be satisfied for band sharing.
