Summary
Resolution of seamless switching within a set of available wireless access solutions applied in ITS (Intelligent Transport System) applications is presented. The CALM based system or specifically designed and configured L3/L2 switching can be an adequate solution for the multi-path access communication system. These systems have to meet requirements of the seamless secure communications functionality within even an extensive cluster of moving objects. Competent decision processes based on precisely quantified system requirements and each performance indicator tolerance range must be implemented to keep service up and running with no influence of continuously changing conditions in time and served space. The method of different paths service quality evaluation and selection of the best possible active communications access path is introduced. This method is studied within project STATVU1. The proposed approach is based on Kalman filtering which separates reasonable part of noise and also allows prediction of the individual parameters near future behavior. The presented classification algorithm applied on filtered measured data combined with deterministic parameters is trained using historical data, i. e. combination of parameters vectors line and relevant decisions. Quality of classification is dependent on the size and quality of the training data sets.
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Extract
Communications Multi-Path Access Decision Scheme
1. Introduction
The first step in addressing the ITS applications using GNSS is the analysis and establishment of performance requirements on telematics applications in co-operation with the end-users or with organizations like Railways Authority, Road and Motorways Directorates, Air Traffic Controls, etc., and the decomposition of systems requirements to individual subsystems of the telematics chain.For the following individual systems parameters a methodology for their measurement have been developed - see [1] - [3]: (i) Safety - risk analysis, risk classification, risk tolerability matrix, etc., (ii) Reliability - the ability to perform the required function under the given conditions for a given time interval, (iii) Availability - the ability to perform the required function at the initialization of the intended operation, (iv) Integrity - the ability to provide ti...See the full content of this document
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