Dimensioning Cellular Wimax Networks

One of the crucial demanding factors for WiMAX wireless networks is to provide broadband services all over the geographic region. With an increase in distance the achievable carrier to interference Ratio (CINR) declines which point to non line of sight (NLOS) and decrease the signal. This paper discusses an analytical dimensioning approach and feasible planning techniques. Cell planning features (Clustering and sectorization) [1] has been considered to upgrade the certain criteria e.g. coverage, capacity or cost. Relays are used to enhance the link quality in terms of throughput and coverage area [2]. These has been the used in multi hop scenario. Based on estimated signal to interference plus Noise Ratio (SINR) value, the mean cell capacity of single and multi hop WiMAX networks has been calculated in[1]. For dimensioning WiMAX networks, the worst case CINR with in a cellular 802.16 is important. In downlink (DL) of singlehop, the central base station(BS) broadcasts to the most isolated subscriber station(SS) which is positioned at the cell border but in multihop the central BS first transfers to the relay and then it re-transfers the data to the most isolated SS. In uplink (UL) of singlehop, SS at the cell border broadcasts to the central BS but in multihop network the SS at the cell border broadcasts to the relay and it further re-transfer the data to the central BS. Interference is induced by co-channels in single hop and by BS or relays in multihop that uses the similar frequency channel. [1, 2] Frequency division duplex (FDD) or fully synchronized time division diplex (TDD) schemes are used to separate the DL and UL in the examined networks. [4]