Özetçe -Bu makalede, telsiz haberleşme sistemi Tetra trunk standardı için, kullanıcıların hesapladıgı C1 yol kaybı parametresi ve baz istasyonları tarafından yayınlanan baz istasyonunun yeterli kapasiteye sahip oldugu bilgisi kullanılarak, kullanıcıların en uygun baz istasyonunu ile haberleşmesini saglayan hücre seçim algoritması önerilmiştir. Kullanıcıların hareketsiz oldugu ortamda, hücre içerisindeki farklı sayıda kullanıcılara göre benzetim sonuçları elde edilmiştir. Önerilen hücre seçim algoritmasının mesafe tabanlı hücre seçim algoritmasına göre kullanıcıların baz istasyonlarına daha adil birşekilde dagılım sagladıgı ve baglanan kullanıcıların daha iyi sinyal karışım ve gürültü oranı degerlerine sahip oldukları gözlemlenmiştir.Anahtar Kelimeler-Tetra, profesyonel telsiz haberleşmesi, hücre seçim algoritması Abstract-In this paper, we present a cell selection algorithm for Tetra trunk based professional mobile radio systems. The users are attached the base stations by considering the C1 path loss parameter and the cell load indicator broadcasted by each base station. The simulation results are obtained for various scenarios. It is observed that proposed cell selection algorithm gives better performances than distance based cell selection algorithm in terms of fair distribution of users among base stations and the signal to interference plus noise ratio belonging to attached users.
This paper proposes a cell selection algorithm for Tetra based professional mobile radio systems where the users select the base station according to the proposed utility value. This utility value is determined by considering both cell load and received signal strength indicator. The main aim of the proposed method is to distribute the users in a balanced way among base stations. Based on performance evaluations, we illustrate that the proposed cell selection algorithm gives better results than Tetra based cell selection method in a manner of distribution of the users over all BSs while reducing waiting time for establishing connection.
Load balancing and traffic management are the critical needs in cell selection decision for a better and seamless communication demands in professional mobile radios. For the cases where cell selection algorithms do not consider the traffic load, there may be call drops due to the congestion in networks or longer call setup times for the users. These undesired consequences can cause dramatic quality degradation especially for the emergency cases or public safety services. In this paper, we propose two algorithms for Tetra Trunk based professional mobile radios by considering both traffic load and received signal strength indication (RSSI) in order to reduce the significant delays while establishing transmissions. The proposed full set cell selection algorithm is prioritized to reduce the call setup time for the mobile users and the proposed reduced set cell selection algorithm is focused on minimizing the number of RSSI measurements which causes significant delay in practical professional mobile radio. We illustrate the performance results in terms of delay for Tetra Trunk based professional mobile radio.
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