Adjustments of laboratory environment with EDGE implemented

Adjustments of laboratory

environment with EDGE implemented

• Anne Engman, Ulrika Gustafsson

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.

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).

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

EDGE• EDGE operates at 384 kbps and support wireless multimedia

services based on Internet Protocol (IP)

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

• 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).

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

Modulation• Modulation type in

GSM is GSMK

• 8PSK, a linear modulation

Channel coding

• GPRS

• EDGE

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.

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.

BSS Releases

BSS R9.1

• BTS– EDGE sTRU– DXU21

• BSC– QoS (Quality of Service and

Scheduling)– Compact or High Capacity

product family– BSC or BSC/TRC– Transceivers

• Positioning methods– E-OTD

– A-GPS

• AMR (Adaptive Multi Rate)– Full Rate

– Half Rate

• AXE810– APT1.5– APG40

• OSS

Abis Interface

• 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).

ETSI Ericsson

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.

Laboratory• Wall sockets, CCN 1-6, PCM 1-2

• Upgrades

• Tenux, Wiol, Autosis, MSMS

• OMT, DVT, TEMS, NetHawk, Win- FIOL

• NetHawk

• SATT BCSSimII

• OSS

• DXX

• TSS2200

• TEMS

• MS

• Abis

Adjustments of laboratory environment

• Upgrade of test tools

• Transmission

• BSS R9.1, BSC 9.1, BTS (RBS 2000)

• GPRS/GSN node

• Tests

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)

Documents recommended to read:

• Trollsås.B, “BSS R9.1 Test Analysis for I&V”, 1/0360-201/FCP 103 1970/3, 19-06-2001

• Trollsås.B, “BSS R9.1 Test Analysis for I&V, Part 2”, 1/0360-201/FCP 103 1970/3 Uen, 29-06-2001

• Trollsås.B, “BSS R9.1 Test Analysis for I&V, Part 3”, 1/0360-201/FCP 103 1970/3 Uen, 29-06-2001

Thank you for your time