Download CAT2000 GSM Evolution Towards UMTS

CAT2000
GSM Evolution Towards UMTS
IFT6275
Shouwen Zhang
Fuman Jin
IMT- 2000 Goals
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Global system for wireless communications
Multi-environment operation
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Vehicular
Pedestrian and Outdoor-to-Indoor
Indoor Office
Satellite
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Support for packet data and circuit-switched services
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Multimedia services support
Expected data rates:
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144 kbps in vehicular
384 kbps in pedestrian
2 Mbps in indoor office environment
IMT- 2000 spectrum allocated at WARC 1992
in the 2 GHz band
Year 2000+ services (subject to market considerations)
GPRS: General Packet Radio Service
IMT-2000 End User Terminal Requirements

Low cost

Light weight
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Low power drain / long talk time
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Toll-quality voice
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High security
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Use multiple devices with the same User ID
 Services, routing and charging by personal ID/subscription
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International roaming
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Broad range of services
 Fixed and mobile
 Voice, data, multimedia
GPRS: General Packet Radio Service
IMT- 2000 Key Architectural
Requirements
Broadband Radio Access
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Data Rates: 144, 384, 2000 kbps
Evolution from 2G (CDMA, TDMA, GSM, PHS, etc.)
Mobility vs. Fixed Wireless Access
Harmonized Spectrum Allocations
Broadband Backbone Infrastructure
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Integrated Voice, Data, Image
Network Architecture
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Functional Distribution
 WIN, GSM MAP, INAP
GPRS: General Packet Radio Service
Third-Generation Systems Design Goals
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Meet IMT-2000 requirements
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Offer additional capacity and service enhancements as an evolution of
2G systems (TDMA based GSM and IS-95 / ANSI-41 based CDMA)
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Integrated voice and data system
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Optimized for voice and packet services
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Support higher rate circuit services
Smooth, backwards-compatible evolution from existing 2G systems
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Evolve network infrastructure and software from 2G systems
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New dual-mode terminals allow gradual build-up of high data rate services in 2G
service areas
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Coexistence of 2G voice and data terminals with new wideband terminals
GPRS: General Packet Radio Service
Third-Generation Capabilities for Wideband
Wireless multi-media
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Wide-band “bit pipe” between service providers and end-users
 up to 384 kb/s in wide areas
 up to 2 Mb/s in limited areas
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IP connectivity from end-to-end
 Data ( and Voice)
 Real-time and non real-time
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High bit-rate Services
 at least 384 kb/s wide area
 up to 2 Mb/s in indoor environment
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Multimedia Applications
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Optimized for Packet-data transfer/internet access
GPRS: General Packet Radio Service
Migration Paths
GPRS
GPRS
'
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Packet-based wireless communication
service
New bearer service for GSM
evolutionary step toward Enhanced Data
GSM Environment and Universal Mobile
Telephone Service
GPRS: General Packet Radio Service
Benefits

Higher data rates
 Using all 8 Packet Data Channels (PDCH) GPRS can achieve
up to 171.2kbps (theoretical maximum)
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Packet switched principle
 efficient for burst traffic (e.g., Internet traffic)
 radio channel only be allocated when needed
 spectrum efficiency

User-friendly billing
 payment based on the amount of transmitted data
GPRS: General Packet Radio Service
GPRS
How to implement GPRS from GSM network:
 8 Packet Data Channels (PDCH)
Gateway GPRS Support Node (GGSN)
Serving GPRS Support Node (SGSN)--
GSM terminal change to have a GPRS protocol stack and application software
A Packet Control Unit (PCU) is added to each Base Station Subsystem (BSS)
Radio link Contol
Media Access Control
Radio resource configuration and channel assignment
GPRS: General Packet Radio Service
GPRS System Architecture
GPRS: General Packet Radio Service
SGSN
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Serving GPRS Support Node
 perform mobility management for GPRS mobile stations
 manage the logical link to mobile stations
 route and transfer packets between mobile stations and the
GGSN (Gateway GPRS Support Node)
 handle PDP(Packet Data Protocol (IP and X.25)) contexts
 inter-work with the radio resource management in the BSS
 authentication
 charging (billing customers)
GPRS: General Packet Radio Service
GGSN
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Gateway GPRS Support Node
 function as a border gateway between the GPRS network and
the packet data network (e.g., IP and X.25)
 set up communications with the packet data network
 route and tunnel packets to and from the SGSN
 mobility management
 authentication
 charging
GPRS: General Packet Radio Service
Services
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Bearer services
 PTP(Point-To-Point)
– transfer data packets between two users
– connectionless mode (e.g., for IP)
– connection-oriented mode (e.g., for X.25)
 PTM(Point-To-Multi-point): not available yet
– transfer data packets from one user to multiple users
– multicast service
– group call service

Supplementary services
 call forwarding unconditional
GPRS: General Packet Radio Service
Routing
GPRS Routing Example
GPRS: General Packet Radio Service
Routing
GPRS Network
IP Network
GGSN
SGSN
MS
Host
logical link
tunnel
Packt
Internet/P
DN
IP datagram
IP datagram
GPRS: General Packet Radio Service
Logical Channels
Group
Channel Function
Direction
Packet data
traffic channel
PDTCH
Data traffic
MS  BSS
Packet broadcast PBCCH
control channel
Broadcast control
MS  BSS
Packet common
control channel
(PCCCH)
Random access
Access grant
Paging
Notification
Associated control
Timing advance
control
MS  BSS
MS  BSS
MS  BSS
MS  BSS
MS  BSS
MS  BSS
PRACH
PAGCH
PPCH
PNCH
Packet dedicated PACCH
control channel
PTCCH
GPRS: General Packet Radio Service
Enhanced Data rates for GSM Evolution (EDGE)
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200 kHz carrier spacing
Reach up to 384kbps
8 TDMA time-slot
Modulation Format
8-PSK as opposed to GMSK (in GPRS, HSCSD)
 8-PSK:encodes 3 bits per modulated symbol
GMSK: 1 bit per symbol
Edge transceiver unit need to be added to each cell
Edge terminal--upgrade to use EDGE network
functionality
EDGE System Architecture
GPRS: General Packet Radio Service
UMTS
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384 kbps data capability to satisfy the IMT-2000 requirements
for pedestrian(microcell) and low speed vehicular (macrocell)
environments .
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144 kbps data capability for high speed vehicular environment
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2 Mbps requirement for indoor office is met by using wide band
EDGE (1.6 MHz) carrier
GPRS: General Packet Radio Service
Path Suggested
GSM Path to 3G
HSCSD is not necessary. GPRS is already available.
GPRS is ten times faster than HSCSD.
GPRS expect to be able to offer higher data rates without building too
many new sites.
EDGE follows GPRS and allow a quick and cheap rollout of fast mobile service.
GSM->GPRS->EDGE->UMTS:
smooth evolution
cost-effective
Conclusion
GPRS will be deployed cost-effectively in GSM first.
EDGE will follow GPRS to be deployed as a quick and cheap
rollout of fast mobile service.
UMTS will finally be deployed upon EDGE.