Introduction:

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.

Audience:

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

Prerequisites:

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.

Customize it:

This 2-3-day EGPRS course will be customized to your needs and specifications. Enowireless 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 Enowireless, 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.

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.

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?