GPRS

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GPRS

• Muhammad Al-khaldi
• 215313
• Sultan Al-Khaldi
• 236437

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Outline

• What is GPRS?
• GPRS Handset Classes.
• Classes of GPRS services.
• Benefits of GPRS.
• GPRS Network Components.
• Simple GPRS Architecture.
• IP Addressing.
• Enhanced Data Rates for GSM Evolution.
• GSM Evolution for Data Access.
• Summary.

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What is GPRS?

• GPRS stands for General Packet Radio Service.
• Allows data to be sent and received across a
  mobile telephone network.
• Step toward 3G.
• It is often referred to as 2.5G.
• GSM and GPRS different networks working in
  parallel.

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What is GPRS?

• GPRS combines mobile access with internet
  protocol (IP).
• It is packet based network technology.
• Send and receive data as text, graphics and
  video.
• GPRS is based on modulation technique known as
  GMSK (Gaussian minimum-shift keying).

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GPRS Handset Classes

• Class A
• Have 2 transceivers.
• allow them to send / receive data and voice at
  the same time.
• takes full advantage of GPRS and GSM.
• Class B
• can send / receive data or voice but not both at
  the same time.

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GPRS Handset Classes

• Class C
• Allows one means of connectivity.
• Like GPRS PCMCIA card in a laptop.

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Classes of GPRS services

• traffic priority classification
• Precedence Class An application can be assigned
  a Precedence Class 1, 2 or 3. If an application
  has a higher precedence (1) than another (3) then
  its traffic will be given a higher priority.
• Delay Class Applications can request a delay
  classes which guarantee an average and 95 delay
  for 128 octet and 1024 octet packet size. There
  are 4 classes, 1 being the fastest.

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Classes of GPRS services

• Reliability class Applications can request
  differing levels of reliability for its data
  depending on its tolerance to data loss.
• Throughput Class There are 2 distinctions in
  class, peak and mean. Peak throughput class is
  used mainly for bursty transmissions. Mean is the
  average data transfer rate over a period of time
  measured in octets per hour.

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Benefits of GPRS

• Speed at around 56115 kbps
• Always on connectivity data can be sent or
  received immediately as it is produced .
• The system does not require establishing a
  connection .
• New and Better applications such as video
  conferencing straight to your desktop or mobile
  device.

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Benefits of GPRS

• GSM operator Costs it allows GSM providers to
  add value to their business at relatively small
  costs.
• Extremely efficient use of radio bandwidth this
  is because it is packet based service.

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GPRS Network Components

• GPRS is not a completely separate network from
  GSM.
• Packet Control Unit (PCU) used to control a
  packet switched data.
• Base Station Controller (BSC) it is part of GSM
  network.

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GPRS Network Components

• Serving GPRS Support Node (SGSN) it performs the
  following tasks
• Routing.
• Handover.
• IP address assignment.
• Verification and collection of billing data.

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GPRS Network Components

• Gateway GPRS Support Node (GGSN) provide the
  following
• Works as a gateway.
• Works as a router.
• Works as a firewall.
• Confirms user details with RADIUS (Remote
  Authentication Dial In User Service) servers for
  security.

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GPRS Network Components

• GPRS Tunneling Protocol (GTP) The main function
  is to make connectivity between the SGSN GGSN
• GTP sits on the top of TCP/IP
• responsible for the collection of mediation and
  billing information.
• Home Location Register (HLR) a database that
  contains subscriber information

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Simple GPRS Architecture
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IP Addressing

• There are three different ways
• Fixed IP addressing IP to every handset (the 1st
  way).

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IP Addressing

• Dynamic IP addressing
• The 2nd way is by giving every GGSN an IP and
  every handset belong to this domain. (like LAN)
• The 3rd way (also dynamic) the IP is given by
  RADIUS.( like dial up)

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IP Addressing
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Enhanced Data Rates for GSM Evolution

• EDGE provides Enhanced GPRS (EGPRS).
• Increased data rates with GSM compatibility.
• Still 200 KHz bands still TDMA.
• In addition to GMSK EDGE uses 8PSK.
• 8-PSK modulation 3 bits/symbol give 3X data rate.

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Enhanced Data Rates for GSM Evolution

• EDGE can carry data speeds up to 384 kbps.
• It is anther step to 3G,it reffered as 2.75G.
• Shorter range (more sensitive to
  noise/interference).

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Enhanced Data Rates for GSM Evolution

• Introduces a new technology not found in GPRS,
  Incremental Redundancy.This increases the
  probability of correct decoding.
• EDGE takes the cellular community one step closer
  to UMTS.

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GSM Evolution for Data Access
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Summary

• GPRS is 2.5G.
• It have many advantages.
• the main components of GPRS is
• SGSN
• GGSN
• It have two types of IP addressing
• Fixed IP addressing
• Dynamic IP addressing.

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Summary

• EDGE is 2.75G
• Carry data speeds up to 384 kbps.
• It uses both GMSK 8PSK.
• One step closer to UMTS.

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Thank you

• Any Question