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

Michal Ptacin 20.5.2005 T-110.456 1

Operator and end user performance

Michal Ptacin

Michal Ptacin 20.5.2005 T-110.456 2

Agenda

What GSM and UMTS provide for the end user HSDPA Conclusions and expectations

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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

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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

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Average End user bit rate [kbps]

100 200 300 400 500 600 700 800 GPRS 3+1 EDGE 2+1 EDGE 4+1 WCDMA 384 HSDPA

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Voice channels per base station cabinet

100 200 300 400 500 600 700 800 GSM Full rate GSM Half rate WCDMA

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Data throughput [Mbps] per base station cabinet

5 10 15 20 25 EGPRS WCDMA HSDPA

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Smart antenna technology

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.

• main lobe is almost

aiming to the user minor lobes receive interference signal from other users

• main lobe is aiming

directly to user minor lobes are removed and interferences minimizing

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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)

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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

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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.

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Hybrid Automatic Request

Stop and wait protocol for

ACK/NACK

Unacknowledgement data are

stored in Node B (BTS) Not involved RNC

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Multiple Input Multiple Output

• In space are created communication paths which look as independent

channels

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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???

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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…

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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

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Thank you for your attention !