GPRS | EGPRS Design and Optimization Training

GPRS | EGPRS Design and Optimization Training

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Introduction:

GPRS | EGPRS Design and Optimization Training Course Hands-on

If you have a working knowledge of the air interface and operation of GPRS | EGPRS systems, through prior experience or training, and are ready to focus on the advanced engineering issues, this GPRS | EGPRS Design and Optimization Training course can help you achieve an enhanced quality of experience for your data services subscribers

Wireless operators have, in recent years, pushed to provide data services to subscribers to help broaden their revenue base as well as the subscribers’ mobile experience. Wireless and cellular/PCS technologies have traditionally been designed for circuit switched, voice oriented traffic. So with the introduction of data comes the challenge of designing a network which provides superior quality of service for both voice and data users across the same, contended air interface.

Duration: 3 days

GPRS | EGPRS Design and Optimization Training
 
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Customize It:

• If you are familiar with some aspects of GPRS | EGPRS Design and Optimization Training, we can omit or shorten their discussion.
• We can adjust the emphasis placed on the various topics or build the GPRS | EGPRS Design and Optimization Training course around the mix of technologies of interest to you (including technologies other than those included in this outline).
• If your background is nontechnical, we can exclude the more technical topics, include the topics that may be of special interest to you (e.g., as a manager or policy-maker), and present the GPRS | EGPRS Design and Optimization Training course in manner understandable to lay audiences.

Objectives:

After completing this GPRS | EGPRS Design and Optimization Training course, attendees will be able to:

GPRS | EGPRS Design and Optimization Training – Course Outline:

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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