Bilişsel Radyo Ağlarında Spektrum El Değiştirme

Year 2015, Volume: 19 Issue: 3, 291 - 302, 13.12.2015

Muhammed Bayrakdar , Ali Çalhan

https://doi.org/10.16984/saufenbilder.81445

Cited By: 1

Abstract

Bilişsel radyo, frekans spektrumundaki kullanılmayan boşlukların fırsatçı bir şekilde kullanılmasını sağlayan yeni bir teknoloji olarak geliştirilmiştir. Sabit spektrum tahsisleri, radyo frekans spektrumunda kullanılmayan frekans kanallarının ortaya çıkmasına neden olmaktadır. Bilişsel radyo teknolojisi, ikincil kullanıcıların ortamı sezerek spektrumun boş yada kullanılmayan kısımlarından verimli bir şekilde faydalanmasını amaçlamaktadır. Spektrum yönetimi, birincil (lisanslı) ve ikincil (lisanssız) kullanıcılar arasındaki etkileşimi kontrol eden bir tekniktir. İkincil kullanıcıların birincil kullanıcılara girişim oluşturmaması, bilişsel radyo ağlarının başarımı açısından oldukça önemlidir. İkincil kullanıcılara tahsis edilen frekans kanallarının tekrar birincil kullanıcılara tahsisi durumunda ikincil kullanıcıların yeni bir frekans kanalına geçmeleri gerekmektedir. Bu işlem spektrum el değiştirme olarak ifade edilmektedir. Bu çalışmada, bilişsel radyo ağlarında spektrum el değiştirme olarak bilinen ikincil kullanıcıların kanal değiştirmesi ile ilgili çalışmalar incelenmiştir.

Keywords

Bilişsel radyo, Spektrum el değiştirme, Spektrum yönetimi

Spectrum Handoff in Cognitive Radio Networks

Abstract

Cognitive radio has developed as a new technology that uses unutilized spectrum holes in an opportunistic manner. Fixed spectrum allocations have caused to reveal unused portions of radio frequencies in spectrum channels. Cognitive radio technology aims to take advantage of unutilized or vacant portions of the spectrum by allowing secondary users to sense the spectrum. Spectrum management is a technique that controls interaction between primary (licensed) and secondary (unlicensed) users. It is very important for performance of cognitive radio networks that secondary users must not cause any interference to the primary users. In case of reallocating the frequency channels that has reallocated to secondary users before, it is required for secondary users to access a new frequency channel. This process is described as spectrum handoff. In this work, the process of channel handoff event for secondary users, known as spectrum handoff, in cognitive radio networks are investigated.

Keywords

Cognitive radio, Spectrum handoff, Spectrum management

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