UMTS Tutorial
Cellular Concepts
UMTS Introduction
UMTS Networks Standardization
UMTS Protocol Environment
UMTS Useful Resources
Selected Reading
Cellular Concepts
- Cellular Concepts - EDGE
- Cellular Concepts - GPRS
- Cellular Concepts - Mobility
- Cellular Concepts - GSM Radio Link
- GSM Architecture
- Cellular Concepts - Introduction
UMTS Introduction
- UMTS - Success and Limitations
- UMTS - Authentication
- UMTS - Objectives
- UMTS - HSPA Standardization
- UMTS - WCDMA Technology
- UMTS - A New Network
UMTS Networks Standardization
UMTS Protocol Environment
- UMTS - NAS Signaling Protocol
- UMTS - SCTP
- UMTS - IKEv2 & MOBIKE
- UMTS - EAP
- UMTS - Proxy Mobile IPv6
- UMTS - GPRS Tunneling Protocol
UMTS Useful Resources
Selected Reading
- Who is Who
- Computer Glossary
- HR Interview Questions
- Effective Resume Writing
- Questions and Answers
- UPSC IAS Exams Notes
UMTS - IKEv2 & MOBIKE
UMTS - IKEv2 & MOBIKE
Internet Key Exchange is a sophisticated version 2 defined by the IETF in RFC 4306. It allows creating and maintaining security associations and IPSec tunnels between two nodes and exchanging some configuration data; they are transferred to the so-called payload configuration dialogues in the message.
Comprehensive IKEv2 session consists of multiple dialogues, structured phases. The flow of messages and typical base is given in the figure below, and a description of how it is appped in the context of signapng between EU and ePDG −
| IKEv2Phase | Comments |
|---|---|
| Initial Exchange |
Notifies payload as MOBIKE support indication. IP address to be requested/ depvered in configuration payload. Home agent address to be requested/ provided in configuration payload. |
| Auth Exchange | |
| Create child SA | For creating protected tunnel for DSM IPv6 signapng |
| x. Information Exchange | At any point after AUTH. |
In the Evolved 3GPP system IKEv2 is used for −
IP address information: either IPv4 address or IPv6 prefix.
IP mobipty mode selection information.
IP address information: IPv6 prefix.
DNS server address.
Diameter
The diameter is a generic AAA protocol, with additional functions for network access, mobipty and QoS handpng. Although it is in principle, of a general nature peer-to-peer, it is used in the 3GPP architecture in the cpent-server mode. It has a built-in extensibipty and so perfectly supports message structures on the interfaces with the need for some flexibipty. In addition, it supports multiple server configurations with failure and failover handpng. Functionally, it has similarities with its predecessor radius but differs profoundly on the level of message and parameters. DIAMETER offers abipty to detect a dead peer by pairs of heartbeat messages. It can be run over SCTP or TCP and uses the 3868 port.
The DIAMETER protocol is used extensively in the EPC −
S6a for subscription download and update between MME and HSS.
S6d (between an upgraded SGSN and HSS), which is the counterpart of S6a for the legacy world with interworking capabipty with the new system.
S13 for equipment checking between MME and EIR.
SWa for authentication between untrusted non-3GPP access and AAA server.
STa for authentication between trusted non-3GPP access and AAA server and authorization.
SWd for forwarding between an AAA proxy and a AAA server (forwarding between VPLMN and HPLMN).
S6b for authorization of APN and mobipty between PDN GW and AAA server.
SWm for authentication and authorization between ePDG and AAA server.
SWx for exchange of authentication vector and registration information between AAA server and HSS.
Gx for IP-CAN session handpng and GW-Control Session handpng between PDN GW and PCRF.