The parties have jointly applied to the Delhi high court, requesting that it accept their agreed terms of settlement, subject to such further orders as the court sees fit, it said.
The issue will now have to be resolved through arbitration.
Tata's Vistara has a very strong core team to look into daily operations.
Docomo is looking to expand its reach beyond Japan and sees India and Africa as key emerging markets.
Here's a look at how key Tata group companies fared under Cyrus Mistry's stewardship.