Migration towards IP standards in GSM Mobile Networks Rajkrishna Srinivasan 780915A355 2G1330, Wireless and Mobile Network Architecture 3 rd June 2004 Royal Institute of Technology [email protected]
Jan 26, 2016
Migration towards IP standards in GSM Mobile Networks
Rajkrishna Srinivasan780915A355
2G1330, Wireless and Mobile Network Architecture3rd June 2004Royal Institute of [email protected]
Structure
• Why this topic?
• GSM Introduction
• The life cycle
• IP in GSM
• IP in GPRS
• IP in 3G
• The Future
Why this topic?
• Technology suffers due to proprietary standards
• IP - Open Technology
• Telephony through IP picking up
• Best Effort Service in Carrier Grade System?
GSM Introduction - 1
• CEPT - Conférence Européenne des Postes et Télécommunications
• SMG – ETSI
• GSM – Global System for Mobile Communication
• A Success Story – 190 + countries
GSM Introduction - 2
HLRAUC VLR
MSC
BSC
BTS
MS
BSC
BTS
MS
BSS
A Interface
SS
Life Cycle
• Need to evolve
• New methods to make money
• Data Traffic
• Existing spectrum getting congested
GSM Architecture
MS MSC BSS
TDMA/FDMA TDMA/FDMA
LAPDm LAPDm
RR
MM
CM
RR
MTP
BSSAP SCCP
BSSAP SCCP
MTP 1
2
3/M
Radio Interface A-Interface
MM
CM
IP in GSM
• No provision for IP in this architecture
• Ericsson Trials of “GSM on Net”1
• But still no “real support” for DATA – only HSCSD
• Since IP not used -> Problems of interoperability
1 -http://www.theregister.co.uk/1998/12/23/ericsson_plans_merger_of_wireless/
GPRS
• First attempt to address problem of handling data
• Consists of GSNs (Support Nodes)
• Pay for data usage – always connected!
• Only an interim solution
IP in GPRS
Relay
Network
Service
GTP-
Application
IP
SNDCP
LLC
RLC
MAC
GSM RF
SNDCP
LLC
BSSGP
L1bis
RLC
MAC
GSM RF
BSSGP
L1bis
Relay
L2
L1
IP
L2
L1
IP
GTP-U
IP
Um Gb Gn Gi MS BSS SGSN GGSN
Network
Service
UDP
UDP
3G
• What is 3GPP
• Significance of Release 5
• WCDMA UMTS
• SIP and IP for Multimedia
3GPP Architecture
• Radio Network Controller
• Node B
• Home Subscriber Server
• IP Multimedia Subsystem
Why IMS
• Release 4 of UMTS problems
• VoIP market growth
• Session Initiation Protocol -> Call Control Protocol
• New content, killer apps, multimedia
Why SIP in IMS
• Change in internet model
• Client Server – HTTP, FTP etc
• Now it’s Peer to Peer
• Here SIP has five roles in Establishing, maintaining and terminating communications: User Location, User Availability, User Capability, Call Setup and Call Handling
3GPP Architecture
Open Service Access
• Who is going to make use of all this technology?
• How to boost ARPU?
• Parley group
• Parley OSA -> Common Application Programming Interface (API)
OSA Architecture
framework User Location
HLR CSE WGWWPP
Servers
Service capability server(s)
Interfaceclass
OSA APIOpen Service Access
discovery
Application
Applicationserver
OSA internal API
Challenges for IP
• IP designed for traditional internet - delay is OK!
• Lower layers shielded – Preventive strategy for critical applications
• Notorious radio links
The Future
• 3GPP – Europe and Japan
• 3GPP2 – America and Korea
• IP in 3GPP and 3GPP2
Conclusion
• All IP alternative – Huge Bandwidth Available
• More revenues – ARPU vs. OpEx/CapEx
• More enriched services
• 4G – The “all IP” system