vehicular communication network L5 3G
- 格式:pdf
- 大小:2.86 MB
- 文档页数:99
08/29/2011-12/22/2011 Tao Zhang Telcordia Technologies Email: tao@ Phone: 732-699-2459
Key techniques for supporting packet data services
– – – – How mobiles access packet-switched services User packet routing and transport Configuring PDP Addresses on Mobile Stations How to access other IP Networks through PS Domain
Background on 3G Wireless Systems
3GPP Packet Data Networks
Network architecture and protocol reference model Key concepts
– Packet Data Protocols (PDP) and PDP Context – Bearers and Connections for Packet Services
Node B Radio Network Controller (RNC)
Mobile Devices, Subscribers, and Their Identifiers Mobile Station (MS) in GSM User Equipment (UE) in UMTS
GSM Protocol Reference Model
BTS BTS BTS BSC MSC/ VLR PSTN
Um Interface (Air Interface)
Abis Interface
A Interface
SS7
GPRS Network Architecture
Network Management– – Circuit-Switched (CS) Domain Packet-Switched (PS) Domain IP Multimedia Subsystem (IMS) Information Servers
3GPP Conceptual Network Architecture (Release 5)
When used for packet services, a TMSI is called P-TMSI (Packet TMSI)
– Mapping between TMSI and IMSI: only known by mobile and network IP address – One mobile can have a single or multiple IP addresses – A mobile can acquire an IP address only when necessary – in other words, a mobile may not always have an valid IP address! A mobile subscriber always has a valid IMSI
Circuit-Switched Domain in Core Network
Mobile-services Switching Center (MSC) Gateway MSC (GMSC) Home Subscriber Server (HSS) Visitor Location Register (VLR) Authentication Center (AuC) Equipment Identity Register (EIR)
Voice and Data Links PSTN (Public Switched Telephone Network)
MSC Mobile Switching Center Connects to up to 100 BSs
GSM Network Architecture
Network Management System BTS BTS BTS MSC/ VLR BSC Data Networks ISDN BSC HLR AUC EIR
What Problems Do You See As Important to Address and Why?
Background on 1G/2G Wireless Systems
Basic Cellular Network Architecture
~ 50 Simultaneous Calls Base Station (BS)
PSTN
BTS BTS BTS
Base Station Subsystem
Network Switching Subsystem
Public Networks
MSC: Mobile Switching Center HLR: Home Location Register VLR: Visitor Location Register AUC: Authentication Center EIR: Equipment ID Register
GGSN
Packet Switched Domain
SGSN Core Network UTRAN (UMTS Terrestrial Radio Access Network)
GSM RAN (i.e., Base Station Subsystems) Radio Access Networks
Key procedures
– GPRS Attach Procedure – PDP Context Activation and Modification – Radio Access Bearer Assignment
3GPP Network Architecture
Public Land Mobile Network (PLMN)
HLR BTS BTS BTS BSC
AUC
EIR
PSTN
MSC/ VLR
ISDN
Data Networks
SGSN
GGSN
The Internet Or other data networks
GPRS Core Network
SGSN: Serving GPRS Support Node GGSN: Gateway GPRS Support Node
Key Identifiers
International Mobile Station Equipment Identity (IMEI):
– Identifies MT – Contains information about manufacturer, country, type – Globally unique
ME USIM TE MT TA
USIM (UMTS Subscriber Identity Module): Stores user profile and supports authentication ME (Mobile Equipment): A device used by a user to access the network MT (Mobile Terminal): Supports radio transmission and channel management TE (Terminal Equipment): hardware and software used to link MT to the ME TA (Terminal Adapter): Used to adapt to different radios
PSTN and Circuit-Switched Wireless Network External IP Networks
IP Multimedia Subsystem (IMS)
GMSC Circuit Switched Domain
MSC + VLR
Information Servers Shared by PS and CS Domain (HSS, EIR, AuC)
Switching vs. Call Control
MSC Server
– Call control and mobility management
CS Media Gateway (CS-MGW)
– Circuit switching, media conversion, payload processing (e.g., echo canceller, codec), payload transport
– Mobile Equipment (ME)
Terminal Equipment (TE) Mobile Termination (MT) – Terminal Adapter (TA)
– UMTS Subscriber Identity Module (USIM)
Functional Architecture of User Equipment (UE)
GERAN and UTRAN
GERAN
– Base Station Subsystem (BSS)
Base Transceiver Station (BTS) Base Station Controller (BSC)
UTRAN
– Radio Network Subsystem (RNS)
– A public network administrated by a single network operator for providing land mobile services