I'm working on OpenBTS source code and I need to know if there's any RFC documentation out there for GSM protocol to study?

I googled it, but there's no specific RFC for GSM protocol itself.

Specifically, I'm studying GSM encryption protocol stack but I need to be familiar to the protocol itself.

Anyone helping?

closed as off-topic by Ron Maupin Oct 27 '18 at 5:04

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The IETF doesn't normally have RFCs for layer-1/2 protocols. For example, the IEEE maintains LAN protocols (ethernet, token ring, Wi-Fi, etc.), and the standards for those are in the IEEE working group numbers (802.3, 802.5, 802.11, etc.) from the IEEE.

GSM was created by ETSI. It may be that you must buy the the standard from the GSM Association, or become a member to get a copy of the standard.

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