Handoff in Cellular system In a cellular network, a mobile user located close to the border of two cells can choose serv

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Handoff In Cellular System In A Cellular Network A Mobile User Located Close To The Border Of Two Cells Can Choose Serv 1 (86.37 KiB) Viewed 61 times

Handoff in Cellular system In a cellular network, a mobile user located close to the border of two cells can choose service from either of the base stations of the two cells. Consider such a situation where the received signal powers from two different base stations (hereby named as A and B) can be modeled as follows: For signal received from base station A: Pr. (d) [dBm] = P, (do) [dBm] — 10 × 2 × log₁0 (d/d) + Xo₁[dBm] For signal received from base station B: Pr.B (d) [dBm] = P, (do) [dBm] − 10 × 4 × log₁0 (d/d) + X₁2[dBm] Where X1 and Xoz are zero-mean Gaussian with variances of 4 dBm and 16 dBm respectively. It implies that Pr(d) [dBm] and PrB (d) [dBm] are both non-zero mean Gaussian Random Variables. P, (do) = 70 dBm is same for both. do = 1 m. Cell Radius for both A and B cell is 1000 m with base stations located at cell centers. Answer the following questions. (a) Exactly at the border of the two cells, an event of signal outage happens if both the received signal power drops below - 60 dBm. What is the probability of such outage? (b) Given that a signal outage has happened, the probability of an ongoing call being dropped is 0.4. What is the exact probability of call dropping in this particular case? (c) Let's consider that a mobile user is entering into the service area of Cell B from Cell A. To prevent unnecessary hand-off and also to ensure no outage, a hand- off from base station A to B is allowed only when E[Pr.B - Pr.A] > 1 dBm. How much distance the user has to travel inside the Cell B area from the cell border to satisfy the hand-off condition? Assume that base stations A & B and the user are always on a straight line.