EGPRS System Engineering Training

EGPRS System Engineering Training

Course Delivery

This Course is available in the following format:

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Course Overview:

EGPRS System Engineering Training In-depth

EGPRS System Engineering Training – Wireless and mobile carriers have, in recent years, pushed to provide data services to subscribers in order to broaden the subscriber’s mobile experience. Wireless and cellular/PCS technologies have traditionally been designed for circuit switched, voice oriented traffic, and with the introduction of data comes the challenge of designing a network which provides superior quality of service for voice users as well as superior quality of experience for data users, across the same, contended, air interface

Objectives:

Upon completing this EGPRS System Engineering Training course, learners will be able to meet these objectives:

● In this course is it expected that the student already has a working knowledge of GPRS/EGPRS systems, interface types and definitions on the network and the structure of the GPRS/EGPRS air interface.

EGPRS System Engineering Training – Course Syllabus:

Review of and what is GPRS/EGPRS?

Understanding voice versus data
Deterministic and randomness
Data services and mix of data
Voice versus data for system performance
Standards overview
GPRS/EGPRS nodal and interface definitions
SGSN
GGSN
Gb
Gn
Ga
Gr
Gd
Gs
Gi
Ge
Gx
Gy
Gz
GPRS Bearer & Signalling – definitions, groups & mapping of:
RLC/MAC Layer
PRACH
PAGCH
PCCCH
PDTCH
PDCH
PACCH
Random access requests & packet queuing notifications
USF
GPRS Message Sequence
Attached Request
PDP Context Activation
Primary/Secondary PDP Context
GTP-U
GTP-C
GTP’
GPRS Homing
Location Areas & updates
Routing Areas & updates

System Engineering Considerations

Exercise
Mapping bearer traffic to total traffic – class will walk through several real world scenarios showing the impact of signaling overhead to various coding schemas
Exercise
Simple estimations of throughput with various time slot configurations – class will be asked to predict and collectively model in simplistic terms throughput for various timeslot allocation with the effect of IP packet error rate to arrive at a simple, estimated throughput calculation

Additional Details of GPRS

Coding Schema
Temporary Block Flow – TBF
Channel Assignment – Hopping versus non-hopping
BLER
Throughput versus delay
C/I Ratio
SR-ARQ
Automatic Retransmission Request
BEC
FEC

GPRS Problem Areas

Air Interface
Coverage
Interference
TBF usage
Congestion
Coding schema non-optimal
Transmission time wasted
Core Network
Contention at SGSN
Packet loss
Processing delays at SGSN/GGSN
Buffer/overflow

Troubleshooting & Causes

No IP Address
No PDP Context
No GPRS Attach
RAU Failure
No Uplink Data
No Downlink Data
No GPRS Indicator

Final Exercises

Create a test scenario to simulate parallel GSM and GPRS traffic load on a limited number of theoretical cells
Determine the impact of GPRS load on GSM quality
When and how to prioritize GPRS over GSM
When and how to prioritize GSM over GPRS
Create a test scenario whereby GPRS traffic demand during the busy hour reaches 25% of total traffic
What is the impact on the air interface? BLER, CS, FEC/BEC, SR-ARQ?
What is happening at RA and LA?
What about MIP? How does high versus low mobility provide additional impact?
How should this be optimized and where does one begin?
How do the 8 available coding and modulation schemes available in EGPRS impact throughput? What are the underlying causes of EGPRS using higher versus lower coding schemes?

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