Frequency plannig between TETRA base stations

Year 2022, Volume: 11 Issue: 2, 264 - 270, 15.04.2022

Şakir Yılmaz

https://doi.org/10.28948/ngumuh.1017751

Abstract

Frequency reuse is necessary for wireless communications due to limited frequency. Especially, mission critical communication users usually want to communicate in a wide area with minimum number of base stations. This request increases the frequency demand and this problem could be solved by RF optimization and frequency planning in order to reuse frequencies. This paper suggests a frequency plan to a TETRA system by analyzing traffic load, interference and using neighborhood between base stations.

Keywords

TETRA, Frequency planning, Frequency reuse, adjacent and co channel interference

TETRA baz istasyonları arasında frekans planlaması

Abstract

Günümüzde kısıtlı frekans kaynaklarının tekrarlanarak kullanılması frekans planlama açısından ciddi önem arz etmektedir. Özellikle kritik ses haberleşmesinde daha az baz istasyonu ile daha fazla alan kapsanmak istendiğinde frekans tekrarı sorunu daha çok göze batmaktadır. Bu makalede kritik ses haberleşmesi teknolojilerinden olan Karasal Trunk Telsiz sistemi (Terrestrial Trunk Radio, TETRA) üzerinde bir çalışma yapılmıştır. Baz istasyonları konumları, yayın yaptığı frekans bilgisi, baz istasyonu çıkış gücü, sisteme ait bant genişliği göz önüne alınarak komşu kanal ve ortak kanal girişimleri incelenmiştir. Sayısal telsiz sisteminde mevcut hesapların yetersiz kaldığı ve bu hesaplara ek olarak komşuluk ilişkilerinin de frekans planlamada önemli olduğu tespit edilmiştir. Ayrıca konuşma trafiği yoğunluğu (Erlang) incelenerek sistemde işlevsiz kullanılan frekanslar tespit edilmeye çalışılmıştır.

Keywords

TETRA, Frekans planlama, frekans tekrarı frekans atama, interferans

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