Data Rates In Gsm

DATA RATES IN GSM TECHNOLOGY by SHEBIN.A.KHALAM

History In

1st G AMPS (Advanced Mobile Phone System) developed in U.S in 1983  In 2nd G there was introduction of CDMA, TDMA and GSM Between 2nd and 2.5th G of GPRS  Between 2.5th and 3rd G there was an introduction EDGE TECHNOLOGY

Topics of Discussion  

Mobile evolution Data rates in 3G 2.5G HSCSD (High-speed circuit-switched data ) GPRS (General Packet Radio Service ) EDGE (Enhanced Data Rate for GSM Evolution) HSDPA (High-Speed Downlink Packet Access ) UTRA (Universal Terrestrial Radio Access )

Mobile Evolution   

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1st generation mobile communication 2nd generation mobile communication 2.5th generation mobile communication 3rd generation mobile communication 3G and above

GSM Data Rates are Global  

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GSM data rates with GPRS are in all operator cases across the globe are between 30-40kb/s CDMA 1X user data rates vary from up to 90kb/s in a fragmented Korean market where they have a mixture of proprietary solutions to 43kb/s in the US, which has been measured by Nokia GSM/EDGE user data rates will be 80-100kb/s with the first handsets and then 160 to 200kb/s by end of 2003 WCDMA networks are already in working trials and the terminals have passed regulatory type approval (dual mode) in Europe and Japan Immediacy of service will have the biggest impact on the network load and impact costs

2.5G  

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HSCSD (High-Speed Circuit Switched Data) GPRS (General Packet Radio Service) 144 kbps data only EDGE (Enhanced Data for GSM Evolution) 384 kbps data HSDPA (High-speed downlink packet access) Asymmetric. 2 Mbps+ downlink.

3G Technologies 

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Wideband CDMA (W-CDMA): Next Generation GSM. Uses 5 MHz channel width ⇒ 2 Mbps CDMA2000: Next Generation CDMA (IS-95) 1.25 MHz Channels ⇒ 144 kbps 3x, 6x, 9x, and 12x in future 3x (3XRTT): 3.75 MHz channel ⇒ 2 Mbps UWC-136: Next Generation TDMA (IS-136) 200 kHz Channels ⇒ 384 kbps or 1.6 MHz Channels ⇒ 2 Mbps Developed by Universal Wireless Communications Consortium (UWCC) Goal: Provide high-speed packet based Voice and Data

HSCSD  

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High-Speed Circuit Switched Data (HSCSD) First attempt to get high-speed data over GSM Allows data users to get 1 to 8 slots Data rates up to 115 kbps Circuit switched ⇒ Constant data rate Not suitable for bursty data Not widely implemented GPRS is more widely implemented

GPRS  

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General Packet Radio Service (GPRS) Standard GSM has 8 slots per 200 kHz channel ⇒ 9.6 kbps data GPRS allows any number of slots to a user 

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4 different codings used depending upon channel condition 9.05 kbps to 21.4 kbps per slot 76-171 kbps using all 8 slots.

GPRS user can hop channels (as in CDPD). 2.5G Technology

EDGE Enhanced Data rates for GSM Evolution 

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Can increase the capacity and data throughput typically to 3-4-fold over GPRS Theoretical maximum speeds of up to 473 kilobits per second (kbps) Average recognizable data rates between 80 and 130 kbps TDMA carriers must still convert to GSM, then add GPRS before deploying EDGE technology

HSDPA        

High-Speed Downlink Packet Access for WCDMA Improved spectral efficiency for downlink ⇒ Asymmetric Up to 10 Mbps in theory, 2Mbps+ in practice Announced by Siemens, then by Ericsson, Alcatel, Fujitsu Adaptive modulation and coding (AMC) Multi-code (multiple CDMA channels) transmission Fast physical layer (L1) hybrid ARQ (H-ARQ) Packet scheduler moved from the radio network controller (RNC) to the Node-B (base station) ⇒ advanced packet scheduling techniques ⇒ user data rate can be adjusted to match the instantaneous radio channel conditions.

DATA RATES Technology

Bandwidth

Data Rate/User (Theory)

Data Rate/User (Realistic)

GSM

200 kHz

9.6 kbps

9.6 kbps

GPRS

200 kHz

172 kbps

40 kbps

EDGE

200 kHz

474 kbps

100 kbps

CDMA2000 3x

3.75 MHz

2 Mbps

384 kbps

WCDMA

5 MHz

2 Mbps

1 Mbps

UMTS 

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Currently six bands that are specified for the use for UMTS/WCDMA. Much of the focus on UMTS is currently on frequency allocations around 2GHz. Uplink Frequency: 1885- 2025 MHZ Downlink Frequency: 2110- 2200 MHz The channels are spaced by 5MHz. The downlink uses quadrature phase-shift keying (QPSK) for all transport channels. Uplink used two separate channels so that the cycling of the transmitter on or off does not cause interference to the audio lines.

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