Adjustments of laboratory environment with EDGE implemented

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Adjustments of laboratory environment with EDGE
implemented

• Anne Engman, Ulrika Gustafsson

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Background

• The development of third generation cellular
  systems is under progress.
• EDGE ( Enhanced Data Rates for Global Evolution)
  is one of them. When EDGE eventually is in use,
  it must be tested at least with the same aspects
  as GSM has been tested.
• As background to the thesis it was necessary to
  get familiar with GSM, GPRS, 3G and of course
  EDGE.

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Assignment Specification

• This thesis will investigate how the introduction
  of EDGE is going to affect the activity of PLMBTS
  laboratory.
• In order to investigate the affects of EDGE there
  has to be a study of the present laboratory
  testing system.
• Problems regarding the laboratory, which has to
  be considered are
• Define existing test procedures.
• Which test procedures are affected?
• How will they be changed?
• Can testing be done with present tools?
• If not, what kinds of measures are needed?
• Are the computer resources adequate?
• If not, what kinds of measures are needed?
• Problems regarding technical description of EDGE
  that has to be considered are
• Influence of EDGE on the radio network.
• Influence of higher data rates.
• EDGE implemented in BSS (BTS, BSC).

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GPRSGeneral Packet Radio Services

• It is a standardized packet switched data service
  for GSM based system
• It is designed to work within the existing GSM
  infrastructure with packet switched nodes
• Several GPRS users can share one channel
• GPRS allows roaming between different PLMNs
• GPRS uses GSM nodes and adds new nodes

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EDGE

• EDGE operates at 384 kbps and support wireless
  multimedia services based on Internet Protocol
  (IP)

• The introduction of EDGE in GSM phase 2 offers a
  new physical layer that enhances existing
  services like GPRS and HSCSD.

• EGPRS enhanced GPRS offers up to 473.6 kbps in
  the same bandwidth of 200kHz, (new modulation
  technique and error tolerant transmission methods
  combined with improved link adaptation
  mechanisms).

• The new modulation technique 8PSK will be used in
  combination with GMSK.

• ECSD Enhanced Circuit Switched Data is an
  extension of the HCSD concept for GSM employing
  8PSK modulation.

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Modulation

• Modulation type in GSM is GSMK

• 8PSK, a linear modulation

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Channel coding

• GPRS

• EDGE

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LQCLink Quality Control

• WHY?
• Since 8PSK is more sensitive to noise and
  interference than GMSK, there is a need to adapt
  the used coding scheme to the interference
  situation.

• HOW?
• LQC provides each user with the maximum
  throughput, by using the most appropriate coding
  scheme.

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Implementation of EDGE

• The implementation of EDGE in Ericsson GSM
  network affects the BSC, BTS and OSS, through new
  software and new EDGE TRUs (RBS 2000 macro base
  station series).
• Only minor parts of the core network, SGSN and
  HLR are affected.

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BSS Releases
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BSS R9.1

• BTS
• EDGE sTRU
• DXU21

• AXE810
• APT1.5
• APG40

• Positioning methods
• E-OTD
• A-GPS

• BSC
• QoS (Quality of Service and Scheduling)
• Compact or High Capacity product family
• BSC or BSC/TRC
• Transceivers

• AMR (Adaptive Multi Rate)
• Full Rate
• Half Rate

• OSS

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Abis Interface
ETSI
Ericsson

• Existing limit of 16 kbps per TS is not
  sufficient.
• In order to introduce EGPRS capabilities it must
  be possible to allocate up to 64k on the Abis for
  an EGPRS capable TS.
• Increased Capacity on Abis. The capacity on
  Abis can be doubled by supporting 4 PCMs per RBS
  2000 instead of 2 .
• The new DXU21 in RBS 2000 supports 4 transmission
  ports ( Ports A-D).
• Network design solution description.
• LAPD, saves signalling transmission resources.

• The BSC - BTS interface.
• Supports all the services offered to GSM users
  and subscribers.
• It allows control of the radio equipment and
  frequency allocation in the BTS.
• The definition of the interface follows a layered
  approach (similar to ISDN).

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Upgrade of Test Tools

• NetHawk Concurrent 3G/GPRS/EDGE/GSM Analysis,
  (1Q 2002).

• WinFIOL 6.0 Will support APG40.

• SATT/BSCSimII RBS Test Tool phase out, the last
  version will not support test ofRBSs with IP-BSS
  or EDGE.

• OSS R9.1 It is needed in all OSS network
  elements.

• DXX Now it can also perform GPRS E1 Frame Relay
  grooming to save expensive SGSN E1 Frame Relay
  ports and transmission costs.

• TSS2200 supports the dynamic configuration of
  LAPD.

• The TEMS portfolio will support all the 2.5G and
  3G air interfaces wireless network will use in
  the quest to make the mobile Internet a reality.

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Laboratory

• Wall sockets, CCN 1-6, PCM 1-2

• OMT, DVT, TEMS, NetHawk, Win- FIOL

• Tenux, Wiol, Autosis, MSMS

• Upgrades

• MS

• NetHawk

• SATT BCSSimII

• OSS

• DXX

• TSS2200

• TEMS

• Abis

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Adjustments of laboratory environment

• Upgrade of test tools

• BSS R9.1, BSC 9.1, BTS (RBS 2000)

• GPRS/GSN node

• Transmission

• Tests

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Tests

• New or changed tests (after introducing BSS R9.1)

• AMR (Adaptive Multi Rate)
• Positioning
• Abis
• 4 PCM/TG

• GPRS Regression
• QoS (Quality of Service)
• EGPRS and LQC (Link Quality Control)
• CS-3/CS-4 and LA (Link Adaptation)

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Documents recommended to read

• Trollsås.B, BSS R9.1 Test Analysis for IV,
  1/0360-201/FCP 103 1970/3, 19-06-2001
• Trollsås.B, BSS R9.1 Test Analysis for IV, Part
  2, 1/0360-201/FCP 103 1970/3 Uen, 29-06-2001
• Trollsås.B, BSS R9.1 Test Analysis for IV, Part
  3, 1/0360-201/FCP 103 1970/3 Uen, 29-06-2001

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Thank you for your time