首页 > itarticle > [intro. to computer security course note] ch 24 (supplement 2) Evolution of mobile networks How to set up data services in 4G networks Security in 4G networks

[intro. to computer security course note] ch 24 (supplement 2) Evolution of mobile networks How to set up data services in 4G networks Security in 4G networks

admin 11月 13, 2020 0

Evolution of mobile networks

Standards Body for Mobile Network: 3GPP

An international standards body
Evolves and standardizes GSM, UMTS, LTE, among others
We will primarily discuss 3GPP standards

Current Mobile Networks

Technology: 3G -> 4G

4G LTE: First global standard for mobile broadband
- More data capacity
- Faster speed
- Lower latency
- New service paradigm
Key enabler: network architecture evolution

Network Architecture Evolution

2G is based on Circuit Switching (CS)

End-end resources reserved for "call"sss
- No sharing

CS Signaling

Used to setup, maintain, and tear down VC
Used in 2G, 3G

Packet Switching (PS)

Store-and-forward at intermediate routers
Used by the Internet

PS Signaling

No call setup at network layer
No network-level concept of "connection"
Packets forwarded using destination host address
- Packets between same source-destination pair may take different paths

4G Cellular Network Architecture

- MME: Mobility Management Entity
- BS: Base Station

3G/4G Network Architecture

Operations

Two main planes in operation in parallel
- Data/User plane: content delivery
- Control plane: signaling functions
  - Three Major Functions
    - Radio Resource Control (RRC)
    - Mobility Management (MM)
    - Connection Management (CM)
Additional plane that woks with the above
- Management plane: configurations, monitoring

How to set up data services in 4G networks

Security in 4G networks

- IMSI (International Mobile Subscriber Identity): 國際移動用戶識別碼
- TMSI (Temporary Mobile Subscriber Identity): 臨時移動用戶識別碼
-