name: SGW
full_form: Serving Gateway
context: TLS or any other authentication method to get shared key Ksm 2. User A sends an INVITE message which includes the following parameters: plain identity of user A ID-A, plain identity of user B ID-B and Ea (ID-A, ID-B) (encrypted ID-A, ID-B with key Ka) to SGW 3. Once receive the INVITE message from user A, SGW sends a request message, which includes the following parameters: plain ID-A, plain ID-B, Ea (ID-A, ID-B) and Esg(ID-A,ID-B) to the KMS to request media key K. 4. KMS use Ka, Ksg to get decrypted ID-A, ID-B from Ea (ID-A, ID-B) and Esg(ID-A,ID-B), and compare the decrypted ID-A, ID-B with plain ID-A , ID-B to make sure they are same. Then KMS generate the media key K. 5. KMS encrypts the K using Ka, Ksg to get the Ea(K), Esg(K) respectively, and then sends the Ea(K), Esg(K) to SGW in the response message. 6. SGW get media key K by decrypting the Esg(K). Then SGW send media key K to PSTN MGW using the security link between SGW and PSTN MGW protected by Ksm. 7. SGW send media Ea(K)
description: The Serving Gateway (SGW) is a network function in the Evolved Packet Core (EPC) that serves as an entry point for mobile devices to access the packet-switched domain. It routes packets between the eNodeB and the PDN Gateway, and also performs functions such as lawful interception, charging, and policy enforcement.
explanation: The text describes SGW's responsibilities in routing traffic, managing connections, and enforcing policies within the EPC network. These functions are characteristic of a Network Function.
section_title: 7.4.3.6	End-to-middle
biotag_Context: B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,B-Network,B-Network Function,O,O,O,O,O,B-Network Function,O,B-Network,B-Network Function,O,O,O,O,B-Network Function,O,O,O
biotag_Description: O,B-Network Function,I-Network Function,O,O,O,O,O,O,O,B-Network,I-Network,I-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,B-Network,O,O,O,O,O,O,O,O,O,O,O,O,O