Harpreet,
perhaps it would be better if you ask your question… then people here could actually provide you the information you need… regarding interviews??? depends on the type of job being applied… but generally, my line of questioning revolves in the general theory of mobile telephony.. call Set-up, role of adjacency, the sub-systems, HLR/VLR roles, hand-over etc… I don’t ask on specific equipment.. equipment changes… but theory does not!