I have three sites each has six cells
(Dual Band GSM900+DCS1800), in all sites cells 1,2,3,5 and 6 carry traffic but cell 4 no traffic (zero traffic). All the parameters are OK.
The CGI is the same at NSS and BSS level.
What could be the reason?
1-check the BCCH of the cell if it’s in the BA1 and BA2 list
2-check the layer of the cell my be it has not the same layer like the others
3-check CBA parameter
4-finally make drive test in the related area
Please also check the hardware – combiners, BTS cable connections etc. Because even thought the parameters are not optimized, there should be some traffic. Zero traffic means it doesn;t take ant at all. Also verify through Drive test.