CAT2000 GSM Evolution Towards UMTS

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CAT2000GSM Evolution Towards UMTS
IFT6275Shouwen ZhangFuman Jin
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IMT- 2000 Goals

• Global system for wireless communications
• Multi-environment operation
• Vehicular
• Pedestrian and Outdoor-to-Indoor
• Indoor Office
• Satellite
• Support for packet data and circuit-switched
  services
• Multimedia services support
• Expected data rates
• 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)

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IMT-2000 End User Terminal Requirements

• Low cost
• Light weight
• Low power drain / long talk time
• Toll-quality voice
• High security
• Use multiple devices with the same User ID
• Services, routing and charging by personal
  ID/subscription
• International roaming
• Broad range of services
• Fixed and mobile
• Voice, data, multimedia

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IMT- 2000 Key Architectural Requirements

• Broadband Radio Access
• 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
• Integrated Voice, Data, Image
• Network Architecture
• Functional Distribution
• WIN, GSM MAP, INAP

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Third-Generation Systems Design Goals

• Meet IMT-2000 requirements
• Offer additional capacity and service
  enhancements as an evolution of 2G systems (TDMA
  based GSM and IS-95 / ANSI-41 based CDMA)
• Integrated voice and data system
• Optimized for voice and packet services
• Support higher rate circuit services
• Smooth, backwards-compatible evolution from
  existing 2G systems
• Evolve network infrastructure and software from
  2G systems
• New dual-mode terminals allow gradual build-up of
  high data rate services in 2G service areas
• Coexistence of 2G voice and data terminals with
  new wideband terminals

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Third-Generation Capabilities for Wideband
Wireless multi-media

• 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
• IP connectivity from end-to-end
• Data ( and Voice)
• Real-time and non real-time
• High bit-rate Services
• at least 384 kb/s wide area
• up to 2 Mb/s in indoor environment
• Multimedia Applications
• Optimized for Packet-data transfer/internet access

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Migration Paths
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GPRS

• GPRS
• Packet-based wireless communication service
• New bearer service for GSM
• evolutionary step toward Enhanced Data GSM
  Environment and Universal Mobile Telephone Service

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Benefits

• Higher data rates
• Using all 8 Packet Data Channels (PDCH) GPRS can
  achieve up to 171.2kbps (theoretical maximum)
• 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

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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

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GPRS System Architecture
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SGSN

• 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)

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GGSN

• 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

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Services

• 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

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Routing
GPRS Routing Example
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Routing
logical link
tunnel
Internet/PDN
Packt
IP datagram
IP datagram
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Logical Channels
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Enhanced Data rates for GSM Evolution (EDGE)

• 200 kHz carrier spacing
• Reach up to 384kbps
• 8 TDMA time-slot
• Modulation Format
• 8-PSK as opposed to GMSK (in GPRS, HSCSD)
• 8-PSKencodes 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

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EDGE System Architecture
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UMTS

• 384 kbps data capability to satisfy the IMT-2000
  requirements for pedestrian(microcell) and low
  speed vehicular (macrocell) environments .
• 144 kbps data capability for high speed vehicular
  environment
• 2 Mbps requirement for indoor office is met by
  using wide band EDGE (1.6 MHz) carrier

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Path Suggested
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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-gtGPRS-gtEDGE-gtUMTS

smooth evolution
cost-effective
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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.