The much awaited auction of spectrum for 3G mobile services is likely to be delayed by more than a month and may commence from the first week of March next year -- schedule for which is to be announced soon.

The auction process may start in last week of February or the first week of March, a senior government official said, adding the revised schedule is being worked out taking into account the outcome of last meeting of an Empowered Group of Ministers where defence ministry agreed to vacate spectrum.