Compute the pole capacity of a sector in a cell

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Reference no: EM132666958

Capacity-Limited Network Design for Canberra

We are designing a mobile cellular network using UMTS technology to serve Canberra in Australia which has a land area of A=814.2 km' and a population of 403,468 people. Assume that 70% of the inhabitants use the mobile network service, and the mobile network has 90% coverage. Sectorized cells are used in the mobile cellular network. Assume that the maximum number of users, called pole capacity, that each cell's sector in the mobile network can support in the uplink is given by

where
• R_b: data rate, measured in bits per second (bps, kbps, Mbps)
• N_o: thermal noise power spectral density (units: W/Hz)
• W: chip rate of the WCDMA system
• α: user uplink activity factor = (time used to transfer data)/(total connection time), α=1 for data, 0.4<α<0.7 for voice
• β=(power of all interfering cells)/(power of cell of interest)
Depends on a NodeB's radiation pattern, 0.93 (3-sector cell) and 0.67 (omni antenna)

(a) Compute the pole capacity of a sector in a cell site using 3x120° sectored antennas if α=0.6, W=3.84 Mops (i.e., for UMTS), β=0.93, Eb/No = 8 dB and Rb=15 kbps.

(b) Assume that the efficiency of each sector is 80% and the network can be loaded up to only 90% of its pole capacity. Compute the net capacity of each cell.

(c) Assume that the mobile service provider seeks to maintain a grade of service (GOS) of 2%, how much traffic load in Erlangs can each cell support? Assume that each user is served by one channel.

(d) Assume that, on the average, each user generates Au=0.4 E traffic into the network. Compute the traffic demand in the entire Canberra city in Erlangs.

(e) Compute the number of cells dimensioned above needed to cover the required service area.

(f) Compute the surface area of each cell if all cells in the mobile cellular network have the same size Ask

(g) Assuming each cell has a hexagonal shape, how far away from the base station can a mobile user be located and still be able to receive 0.4 E traffic intensity?

Reference no: EM132666958

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