Successfully reported this slideshow.

kunz-pc.sce.carleton.ca/sce581/GPRS1.ppt

942 views

Published on

Published in: Technology
  • Be the first to comment

kunz-pc.sce.carleton.ca/sce581/GPRS1.ppt

  1. 1. Andrew J Wilton Director of Applied Research GSM Systems Division
  2. 2. Agenda AGENDA Why Packet? GSM/GPRS Architecture What is EDGE? Deployment Issues Standards Terminal Classes GPRS Applications
  3. 3. AGENDA Why Packet? GSM/GPRS Architecture What is EDGE? Deployment Issues Terminal Classes Standards GPRS Applications
  4. 4. Why Packet Why Packet? Bursty Services bit/s t WWW browsing example Mean <ul><li>Many user actions are bursty </li></ul><ul><ul><li>e.g. browsing WWW pages </li></ul></ul><ul><li>Internet has variable delays </li></ul><ul><li>PSTN channel not used 100% </li></ul>WWW pages Circuit Data Utilisation Circuit Capacity 33.6k * 56.6 Kbits/s Capacity (Mbytes) USED AVAILABLE * % USED Email 0.99 9.7 10.2 ( Download) Email 0.06 3.0 2.0 (Browsing) Web 0.23 4.2 5.5 (browsing)
  5. 5. Permanent Virtual Circuits Why Permanent Virtual Circuits? <ul><li>INITIAL CALL PROCESS TIME (s) </li></ul><ul><li>GSM Call 4 </li></ul><ul><li>TrainModem 30 </li></ul><ul><li>Login and Authenticate 11 </li></ul><ul><li>Download mail 180 </li></ul><ul><li> Total 3 min 45s </li></ul><ul><li>SUBSEQUENT CALL </li></ul><ul><li>Repeat Above 3 min 45s </li></ul>Mail Only When Connected <ul><li>INITIAL CALL PROCESS TIME (s) </li></ul><ul><li>GPRS Call 4 </li></ul><ul><li>Login and Authenticate 11 </li></ul><ul><li>Download mail 180 </li></ul><ul><li> Total 3 min 15s </li></ul><ul><li>SUBSEQUENT CALL </li></ul><ul><li>Not applicable - Virtual Cct 0min 0s </li></ul>Mail Continuously Downloaded Modem Modem Email Server Auth. Server Internet GSM PSTN User Email via GSM Email via GPRS Email Server GPRS User Auth. Server Internet Authenticated path to Email server Virtual GPRS Data Tunnel
  6. 6. GPRS - the Low Cost Data Upgrade * lower figure is data only <ul><li>Saturated Voice Cell </li></ul><ul><ul><li>- 1 Carrier </li></ul></ul><ul><ul><li>- 150 subscribers </li></ul></ul>Upgrade to Data <ul><li>Saturated Voice Cell </li></ul><ul><ul><li>+ 15% Subs are Data Users </li></ul></ul><ul><ul><li>@ 56kbit/s </li></ul></ul>Penetration GPRS HSCSD 3% 0 5 * -12 15% 0 14 * -21 New Timeslots Required 1 1 Conditions: Data - 1:10 duty cycle - 15 minute sessions - 1 session/ 4 hours ~ 10 mins worst case delay Voice - 20mE - 1% blocking
  7. 7. Agenda AGENDA Why Packet? GSM/GPRS Architecture What is EDGE? Deployment Issues Standards Terminal Classes GPRS Applications
  8. 8. GSM Architecture GPRS Register H/VLR MSC BTS BSC GMSC HLR/AUC GPRS Register MAP A-bis PSTN ‘ A’
  9. 9. Architecture - GSM with GPRS SGSN GPRS Register H/VLR GGSN SGSN MSC BTS BSC GMSC Peer Elements Circuit Switched Traffic Packet Traffic HLR/AUC GPRS Register A-bis PCU Gb Gi Gn MAP MAP ‘ A’ GGSN PSTN Public Switched Packet Network
  10. 10. What IS an SGSN/GGSN Routeing info Intranet HLR SGSN External Data Domain Mobililty Management Session Management - QoS - Security - Attach/Detach SGSN Internet Servers Client GGSN MAP Signalling MAP Signalling (GGSN) (SGSN) - Routing - Signalling - Resource Mgt. Client BSS PCU BSS PCU BSS PCU BSS PCU BSS PCU
  11. 11. The Packet Control Unit (PCU) <ul><li>RLC </li></ul><ul><li>Segmentation/Re-assembly </li></ul><ul><li>ARQ </li></ul><ul><li>MAC </li></ul><ul><li>Multiplexing (different mobiles) </li></ul><ul><li>Contention resolution (u/l) - QOS related </li></ul><ul><li>Scheduling/queueing (d/l) - QOS related </li></ul>CCU RLC MAC Packet Switching GPRS Function BSC GSN BTS A bis G b PCU
  12. 12. Agenda AGENDA Why Packet? GSM/GPRS Architecture What is EDGE? Deployment Issues Standards Terminal Classes GPRS Applications
  13. 13. Coding Rates for GPRS & EDGE <ul><li>A new modulation Scheme </li></ul><ul><li>- 8PSK </li></ul><ul><li>200 KHz Channel spacing </li></ul><ul><li>- unchanged </li></ul><ul><li>Symbol rate unchanged </li></ul><ul><li>- 270k symbol/s </li></ul><ul><li>BUT </li></ul><ul><li>- 3 bits/symbol </li></ul>EDGE - Key Aspects Rate Code Rate CS1 9.05kb/s 0.5 CS2 13.4kb/s 0.66 CS3 15.6kb/s 0.75 CS4 21.4kb/s 1.0 GMSK (1 bit/s/symbol) GPRS Rate Code Rate MCS5 22.4 kb/s 0.37 MCS6 29.6 kb/s 0.49 MCS7 44.8 kb/s 0.76 MCS8 59.2 kb/s 1.00 8-PSK (3 bit/s/symbol) GMSK (1 bit/s/symbol) Rate Code Rate MCS1 8.8 kb/s 0.53 MCS2 11.2 kb/s 0.66 MCS3 14.8 kb/s 0.80 MCS4 17.6 kb/s 1.00 EDGE = GMSK + PSK EDGE
  14. 14. EDGE - Coverage vs Data Rate <ul><li>Higher Date Rate Requires </li></ul><ul><ul><li>- More RF Bandwidth </li></ul></ul><ul><ul><li>- More C/I </li></ul></ul><ul><li>For EDGE additional C/I </li></ul><ul><ul><li>- 7 - 10 dB </li></ul></ul>Shannon’s Law EDGE Coverage Relative to Speech 1,2 = 1+ log 2 ) ( C B S I 0 20 40 60 80 100 8.8 11.2 14.8 17.6 22.4 29.6 44.8 59.2 % Cell Area Covered Data Rate / Time Slot 1 Interference Limited Case 2 Conditions: <ul><li>Speech Coverage 12dB C/I </li></ul><ul><li>4/12 Re-use </li></ul><ul><li>No SFH </li></ul><ul><li>10 % Block Erasure Rate </li></ul>
  15. 15. Evolution Paths for GSM * Whole Carrier 1 4 time Slots 2 Interference Ltd Path Standards Delay Equipment Spectrum B/W Coverage 2 HSCSD 1 GPRS 1 EDGE 1 UMTS * x4 x4 x20 x40 GSM Now Now Q1 ‘99 Q1 ‘00 Q1 ‘00
  16. 16. Agenda AGENDA Why Packet? GSM/GPRS Architecture What is EDGE? Deployment Issues Standards Terminal Classes GPRS Applications
  17. 17. Effect of ARQ <ul><li>Assumes 4/12 reuse and speech coverage at 12 dB C/I (no SFH) </li></ul>No Retransmission 0 20 40 60 80 100 8.8 11.2 14.8 17.6 22.4 29.6 44.8 59.2 (kb/s) Two Retransmissions One Retransmission
  18. 18. Voice Over IP <ul><li>Over Dimension Transmission </li></ul><ul><li>- delay budget </li></ul><ul><li>QoS Management </li></ul>PSTN PPDN MSC XCDR GGSN SGSN GMSC <ul><li>Transmission </li></ul><ul><li>MSC Costs </li></ul><ul><li>Transcoders </li></ul><ul><li>Transmission </li></ul><ul><li>IP Routers </li></ul><ul><li>Media Gateways </li></ul>? ? Voice over Packet Voice over Circuit BTS Cost Bandwidth vs Delay BSC PCU 20 ms* x1 x10 2 ms* Capacity Average bit/s t Voice Voice packets lost Data in spare voice B/W Packet Switch
  19. 19. The Service provider GSM SERVICE IMPLEMENTATION - MSC based - Slow rollout (regression testing) - Service lost on roaming - New Service introduction - potentially corrupts all services - Tied to MSC vendor PSTN PPDN MSC XCDR GGSN SGSN GMSC BTS GPRS SERVICE IMPLEMENTATION - Client Server based - Very fast rollout - Multiple sources for Application development - Each service is stand alone - cannot corrupt others - Matched to Web implementation IP Address Server Phone (Client) BSC PCU
  20. 20. GPRS- Opportunities for Competition 5th Supplier - UMTS RAN BSC PCU PSTN MSC XCDR GGSN SGSN BTS GMSC BSC XCDR BTS RNC NODE B NODE B UMTS RAN I u G b ‘ A’ 4 2 1 5 3 Server PPDN Single MSC/ + BSS Supplier 2 nd Supplier - BSS 3 rd Supplier - GPRS Core Network 4 th Supplier - Service Framework
  21. 21. Islands of Coverage <ul><li>Islands of UMTS coverage </li></ul><ul><ul><li>- small cell size </li></ul></ul><ul><ul><li>- demand driven </li></ul></ul><ul><li>Wide area coverage </li></ul><ul><ul><li>- GPRS or EDGE </li></ul></ul><ul><li>Dual mode UMTS/GSM handsets </li></ul>Server GPRS/EDGE UMTS UMTS Service <ul><li>Services at edge of network </li></ul><ul><ul><li>- transport via GSM or UMTS </li></ul></ul><ul><li>Service Transparent to Transport </li></ul><ul><ul><li>- between operators </li></ul></ul><ul><ul><li>- between media (copper, mobile etc.,) </li></ul></ul><ul><ul><li>- A few services </li></ul></ul><ul><ul><li>- will run less well on GPRS/EDGE </li></ul></ul>CELLULAR COVERAGE CELLULAR SERVICE Data Data UMTS UMTS GSM UMTS
  22. 22. GPRS Threats and Opportunities <ul><li>Client/Server will be the Service Solution </li></ul><ul><li>Opportunities for Competition </li></ul><ul><li>UMTS Ready </li></ul><ul><li>Large number of Application Developers </li></ul><ul><li>Service Re-use on UMTS </li></ul><ul><li>Sell Service on Value not Cost </li></ul>- Speed of service deployment - UMTS will require for cost effective deployment - No disruption to speech service - No longer ‘tied’ to switch vendor - Re-use of GPRS core network - Competition - Speed
  23. 23. Agenda AGENDA Why Packet? GSM/GPRS Architecture What is EDGE? Deployment Issues Standards Terminal Classes GPRS Applications
  24. 24. Standards Issues I u - One Logical Interface - Two Physical Interfaces PSTN MSC XCDR GGSN SGSN GMSC RNC NODE B NODE B UMTS RAN I u Interface G b Server PPDN To GSM BSS Upgraded MSC Network GPRS Core Network
  25. 25. Agenda AGENDA Why Packet? GSM/GPRS Architecture What is EDGE? Deployment Issues Standards Terminal Classes GPRS Applications
  26. 26. GPRS Terminal Types Type A : Can support circuit and packet calls concurrently . Type B : This type of phone can support circuit or packet (not both together) and can be registered for both…i.e. an IP address and a PSTN number. Type C : This type of phone can only be registered for packet OR circuit but not both.
  27. 27. GPRS Terminal - Multi-Slot Classes Multislot class Maximum number of slots Type Rx Tx 1 1 1 1 2 2 1 1 3 2 2 1 4 3 1 1 5 2 2 1 6 3 2 1 7 3 3 1 8 4 1 1 9 3 2 1 10 4 2 1 11 4 3 1 12 4 4 1 13 3 3 2 14 4 4 2 15 5 5 2 16 6 6 2 17 7 7 2 18 8 8 2 19 6 2 1 20 6 3 1 21 6 4 1 22 6 4 1 23 6 6 1 24 8 2 1 25 8 3 1 26 8 4 1 27 8 4 1 28 8 6 1 29 8 8 1 Tx and Rx not concurrent Tx and Rx Duplex Tx and Rx separate frames COMPLEXITY FACTOR Low Medium High
  28. 28. Agenda AGENDA Why Packet? GSM/GPRS Architecture What is EDGE? Deployment Issues Standards Terminal Classes GPRS Applications
  29. 29. E-Commerce -Key Enablers <ul><li>Dual Slot Phones </li></ul><ul><li>SIM Toolkit </li></ul><ul><ul><li>- some services now </li></ul></ul><ul><li>WAP,MExE </li></ul><ul><ul><ul><li>- full network interaction </li></ul></ul></ul><ul><ul><ul><li>- in the future </li></ul></ul></ul>
  30. 30. E- Commerce Over GPRS E-commerce PLMN Dual-slot mobile phones (SIM Toolkit) Retailers Loyalty Cards Banking Shopping Promotions Financial / Banking Finance Banking On-line transactions Clearing House Corporate / Operator Applications VPN e-mail Cost control Intranet Certificate Authority Merchant Transactions Mobile Transactions Application Providers Content News Weather Sport Internet
  31. 32. The End

×