Which protcol contains the UEContextReleaseCommand message?a.GTPb.NGAPc.NASd.HTTP2

Break Down the Problem

1. Identify the protocols listed in the options: GTP, NGAP, NAS, and HTTP2.
2. Determine which of these protocols is related to the UEContextReleaseCommand message.

Relevant Concepts

1. GTP (GPRS Tunneling Protocol): Primarily used within a mobile network to facilitate data transfer.
2. NGAP (Next Generation Application Protocol): Protocol used in 5G networks, particularly during the signaling phase for control plane operations.
3. NAS (Non-Access Stratum): Refers to the protocols that handle signaling between the user equipment (UE) and the core network.
4. HTTP2: An application layer protocol designed for fast Web communication, irrelevant in this context.

Analysis and Detail

1. The UEContextReleaseCommand message is part of the signaling process that manages the context of user equipment (UE) in a mobile network.
2. It is typically utilized when a user session needs to be released, often following procedures in the NAS layer as well as through the NGAP when it comes to 5G networks.

Verify and Summarize

1. The UEContextReleaseCommand message is closely associated with the NAS and NGAP protocols.
2. Given that it specifically supports the interaction of user equipment with the network layer, NGAP is a strong candidate as it directly deals with session management in 5G.

Final Answer

The correct option is b. NGAP.