It was also proposed, at one stage, to support packet radio services in the US D-AMPS TDMA system, however, in practice, all of these networks have been converted to GSM so this option has become irrelevant.

PRS module is an open standards driven system. The standardization body is the 3GPP.

GPRS tunnelling protocol (GTP)

GPRS Tunnelling Protocol is the defining IP-based protocol

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