Why gsm 900

Extensive experimental tests were performed in the geographic area of Nablus and especially in the city center to investigate the channel propagation behavior in different directions relative to the streets. The results of those measurements were used to define the standard deviation, mean error and RMSE to enhance our understanding of wave propagation in the city. Frequency reuse is a technique where frequencies and channels within a communication system is reused to improve capacity and spectral efficiency.

Frequency reuse in mobile cellular systems requires each cell to maintain a frequency that is enough far away from the frequency in the adjacent cell to eliminate the interference problems. A local operator requires frequency reuse for many sites. For example, Nablus has around seventy sites with each site containing two to three cells while the operator has twenty-four channels from GSM band. Therefore, frequency reuse is an urgent need in Nablus cellular networks.

The paper is organized such that Section 2 presents the measurement environment. Section 3 reviews some propagation models and the path loss concept. Section 4 discusses the standard macrocell model tuning. Section 5 describes Bertoni-Walfisch model tuning and Section 6 concludes the findings. The measured data was collected using a test drive where an average of several measurements was taken for each rout. Offer does not apply to e-Collections and exclusions of select titles may apply.

Offer expires December 31, Browse Titles. Add to Cart. Instant access upon order completion. Free Content. Guard bands kHz wide are placed at either end of the range of frequencies. In some countries the GSM band has been extended to cover a larger frequency range.

Channel numbers to GSM-R provides additional channels and specialized services for use by railway personnel. All these variants are included in the GSM specification. GSM uses — MHz to send information from the mobile station to the base tranceiver station uplink and — MHz for the other direction downlink , providing channels channel numbers to Duplex spacing is 95 MHz.

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