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| Introduction: |
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| 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. |
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| Audience: |
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| RF Engineers, data planners, network planners and designers, transport engineers, application
developers, IT personnel, marketing personnel and executives responsible for strategy and investment who are focused
on delivering and enhancing the quality of experience of subscribers with data services and applications |
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| Prerequisites: |
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| 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. |
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| Customize it: |
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| This 2-3-day DNS course will be customized to your needs and specifications. Eno.com will assist
you in identifying those needs and specifications. A word to the wise, there are many vendors of wireless training.
They will typically have a broad and general course, one size fits all, already developed and just put your organization’s
name on the title slide. This minimizes their effort and time investment. At Eno.com, every course is made to your
exact and exacting specifications. We help you ensure what you are getting is what you really need even if at the
beginning you weren’t too sure of what that was. We fit the class to your needs. We never fit you into our “standard”,
one size fits all, class. |
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| Objectives: |
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| 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. |
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| Course Outline |
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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?
Please call or e-mail to schedule a no-obligation conference call to help us understand your
audience background and training objectives.
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For organizational purchases, please send us a message at  salesinfo@eno.com
or complete and submit this form .
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| Other Expertise: |
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