Reliance Communications (RCom) has served a legal notice to the department of telecommunications (DoT) asking it to 'freeze' the allocation of additional spectrum to existing GSM operators.In the legal notice served today, the Anil Ambani group company has also sought enforcing of the subscriber criteria for spectrum allocation that was recommended by the Telecom Engineering Centre (TEC). Reliance Communications has stated that TEC recommendations were 'accepted in-principal' by the DoT in October 2007.Reliance Communications has also sought surrendering of 50 MHz spectrum that is in possession of the GSM operators. It had earlier alleged that GSM operators were hoarding spectrum beyond their entitlement of 6.2 MHz.The telephony and internet major has also sought refarming of spectrum between 900 MHz and 1800 MHz and its equal distribution among all operators to create a level playing field.It has also stated that refarming of premium 900 MHz spectrum would result in capital expenditure savings of Rs 15,000 crore and annual operational expense savings of Rs 2,000 crore.The legal notice has also sought levying of an additional spectrum fee, until the GSM operators return excess spectrum.FULL COVERAGE: SPECTRUM TANGLE