A NEW APPROACH FOR EFFICIENT UTILIZATION OF RESOURCES IN WIMAX CELLULAR NETWORKS

This paper proposes new static resource utilization (SRU) approach by using the fractional frequency reuse (FFR) technique to enhance resource exploitation in Worldwide Interoperability for Microwave Access (WiMAX) 802.16e. This approach not only efficiently enhances resource exploitation in the base station (BS) but also increases the data rate and number of served users. This work considers the downlink sub-frame of WiMAX BS by using the partial usage of sub-channel mode and the orthogonal frequency division multiplexing access. Five cases were included as a trade-off study to identify the best way of utilizing BS resources in the FFR technique. Theoretical analysis was conducted to present a new formula for the FFR data rate. Simulation results (cases 5 and 4) reveal that the proposed approach has an advantage over the traditional FFR technique in various metrics. The number of served users and slots utilized was increased by 100 % when case 5 was considered. By contrast, the data rate (8,69 Mbit/s), subcarrier efficiency (2,02 bit/subcarrier/burst), and spectral efficiency (0,869 bit/s/H) were enhanced when case 4 was considered. The efficient utilization of bandwidth and resources has made the proposed approach a compelling candidate for cellular network deployment.Original Abstract: U radu se predlaze novi pristup primjene statickog resursa (SRU) pomocu tehnike ponovne upotrebe frakcijske frekvencije (FFR) za poboljsanje iskoristavanja resursa u interoperabilnosti sirom svijeta za mikrovalni pristup (WiMAX) 802.16e. Ovaj pristup ne samo da ucinkovito poboljsava iskoristavanje resursa u baznoj stanici (BS), vec i povecava brzinu prijenosa podataka i broj posluzenih korisnika. Ovaj rad razmatra silaznu vezu podokvira WiMAX BS uporabom djelomicne uporabe potkanalnog nacina i pristupa ortogonalnog multipleksiranja. Pet je slucajeva bilo ukljuceno, kao slucajevi u razmjeni, u identifikaciji najboljeg nacina iskoristavanja resursa BS u FFR tehnici. Provedena je teorijska analiza u svrhu predstavljanja nove formule za stopu FFR podataka. Rezultati simulacije (slucajevi 5 i 4) otkrivaju da takav pristup ima prednost u odnosu na tradicionalnu tehniku FFR u raznim metrikama. Broj posluzenih korisnika i upotrijebljenih slotova povecan je za 100 % u razmatranju slucaja 5. Nasuprot tome, brzina prijenosa podataka (8,69 Mbit/s), ucinkovitost subnositelj (2,02 bit/subnositelj/burst), i iskoristivost spektra (0,869 bit/s/H) poboljsani su kod slucaja 4. Zbog ucinkovi