Operator and end user performance Michal Ptacin Michal Ptacin - PowerPoint PPT Presentation

Operator and end user performance Michal Ptacin Michal Ptacin 20.5.2005 T-110.456 1

Agenda � What GSM and UMTS provide for the end user � HSDPA � Conclusions and expectations Michal Ptacin 20.5.2005 T-110.456 2

Evolution of GSM � voice and CSD 9,6kbps HSCSD 28.8 kbps � GPRS 40 kps ,release 97` – 160 kbps � EDGE 80-100 kbps (with two timeslots) 160-200 kbps (with four timeslots) release 99`- theoretical data rate is 473 kbps � LATENCY GPRS & EDGE around 600ms Improved GPRS around 450ms Michal Ptacin 20.5.2005 T-110.456 3

Evolution of UMTS � WCDMA initial voice and data rates up to 384 kbps � HSDPA 500 – 3600 kbps with 64QAM,MIMO,HARQ over 20Mbps � LATENCY WCDMA – 200ms HSDPA – 100ms Michal Ptacin 20.5.2005 T-110.456 4

Average End user bit rate [kbps ] 800 700 600 500 400 300 200 100 0 GPRS 3+1 EDGE 2+1 EDGE 4+1 WCDMA HSDPA 384 Michal Ptacin 20.5.2005 T-110.456 5

Voice channels per base station cabinet 800 700 600 500 400 300 200 100 0 GSM Full rate GSM Half rate WCDMA Michal Ptacin 20.5.2005 T-110.456 6

Data throughput [Mbps] per base station cabinet 25 20 15 10 5 0 EGPRS WCDMA HSDPA Michal Ptacin 20.5.2005 T-110.456 7

Smart antenna technology main lobe is almost main lobe is aiming � � aiming to the user directly to user minor lobes receive minor lobes are removed interference signal and interferences from other users minimizing � Adaptive arrays utilize sophisticated signal-processing algorithms to continuously distinguish between desired signals, multipath and interfering signals as well as calculate their directions of arrival. Michal Ptacin 20.5.2005 T-110.456 8

HSDPA ( High Speed Downlink Packet Access ) � High Speed Downlink Shared Channel (HS-DSCH) � Adaptive Modulation and Coding (AMC) � Hybrid Automatic Request (HARQ ) � Multiple Input Multiple Output (MIMO) Michal Ptacin 20.5.2005 T-110.456 9

High Speed Downlink Shared Channel � The high speed “Fat pipe” on which the packet data are transmitted � Channel is shared between several user � Duration of one Transmit Time Interval (TTI) is 2ms � Short transmit delay between packets while the channel is shared by multiple users Michal Ptacin 20.5.2005 T-110.456 10

Adaptive Modulation and Coding � GPRS&EDGE –the same modulation and code rate during the transmission � HSDPA use AMC - Modulation and code rate depend on condition in channel. Michal Ptacin 20.5.2005 T-110.456 11

Hybrid Automatic Request � Stop and wait protocol for ACK/NACK � Unacknowledgement data are stored in Node B (BTS) Not involved RNC Michal Ptacin 20.5.2005 T-110.456 12

Multiple Input Multiple Output In space are created communication paths which look as independent � channels Michal Ptacin 20.5.2005 T-110.456 13

What do these all improvements mean for the end user � Shorter service response time � Faster perceived connection � Higher data rates � Download packet data simultaneously with voice call � Real-time packet-based services � Better availability of services � Less price for call and date??? Michal Ptacin 20.5.2005 T-110.456 14

What we can expect from the 4th generation � Entirely packet-switched networks. � Higher bandwidths to provide multimedia services at lower cost (up to 100Mbps). � Integrate different modes of wireless communications: WLAN, Bluetooth, cellular systems, radio and TV broadcasting, satellite communications… Michal Ptacin 20.5.2005 T-110.456 15

References Sudhir Dixit and Tao Wu, Content Networking in The Mobile Internet http://www.umtsworld.com/ www.3gpp.org www.ieee802.org/16/tg3/contrib/802163p-00_39.pdf www.nokia.com www.iec.org Smart antenna systems Michal Ptacin 20.5.2005 T-110.456 16

Thank you for your attention ! Michal Ptacin 20.5.2005 T-110.456 17