- 2080 Bhadra · 2 marks
Ericsson multiple breakpoint model
Short answer
Ericsson multiple breakpoint model is an empirical indoor path-loss model with four breakpoints, where slope increases with distance. It assumes about 30 dB loss at 1 m, gives upper and lower bounds with uniform distribution between them, and is building specific.
What do you mean by Ericsson Multiple Breakpoint model?
The Ericsson multiple breakpoint model is an empirical indoor path loss model, obtained by Ericsson Radio Systems from measurements in a multi-floor office building. Path loss versus distance is drawn as straight-line segments with four breakpoints, and the slope (path loss exponent) increases with distance.
- It assumes about 30 dB loss at d0 = 1 m, which is accurate for 900 MHz with unity-gain antennas.
- It gives both an upper and a lower bound on path loss; the actual loss lies between them, with a uniform distribution assumed in between.
- The slope is small close to the transmitter (near free space, about 20 dB/decade) and rises sharply beyond a few tens of metres as more walls and floors block the path (typical lower-bound slopes about 20, 30, 60 and 120 dB/decade, with breakpoints near 10 m, 20 m and 40 m).
- It is easy to use and suits planning of indoor coverage (e.g. office PCS and WLAN), but it is building specific.
✓ Answer checked by Claude Opus 5.5 (high effort)
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