Implementing IEEE WiMAX standard in OPNET Present by : Chung Kei IP, Gabriel ( ) Supervisor : Dr. Jamil Khan FYP Symposium (ELEC4890A) The University of Newcastle, Australia 23/6/2005 CopyRight: Chung Kei IP creating the IEEE WirelessMAN™ Standard for Wireless Metropolitan Area Networks

Outline Scope of the project Overview of WiMAX Project background IEEE MAC layer descriptions Method of implementation - OPNET Current status and results Future work FYP Symposium (ELEC4890A) The University of Newcastle, Australia Outline 2

Scope of Project Design and develop simulation model using OPNET simulation package for the IEEE WiMax standard Concentrate on Medium Access Control (MAC) layer protocol and functionalities With a single base station (BS) services multiple subscriber stations (SSs) simultaneously Analyse the performance of the WiMax network and obtain traffic statistics form different types of scenarios under multi-user environment FYP Symposium (ELEC4890A) The University of Newcastle, Australia Scope | Background & Overview | MAC layer | Method | Current & Future | Summary 3

Overview of WiMax What is WiMax?? FYP Symposium (ELEC4890A) The University of Newcastle, Australia Scope | Overview & Background | MAC layer | Method | Current & Future | Summary 4 Alternative from DSL broadband access services – expensive installation cable in long distance Provide Internet service in rural areas – up to 31 miles from base station with high data rates Fixed “last mile” problem Why need WiMax?? Worldwide Interoperability for Microwave Access The commercialization of IEEE standard Technology based on evolving standard for point-to- multipoint wireless broadband networking Solution for Wireless Metropolitan Area Network BWA (Broadband Wireless Access) solution

Project background FYP Symposium (ELEC4890A) The University of Newcastle, Australia Scope | Overview & Background | MAC layer | Method | Current & Future | Summary 5 Two basic scenarios to be simulated

MAC layer in WiMax Connection oriented Protocol independent core (ATM, IP, Ethernet,…) Point-to-Multipoint (PMP) in downlink direction (BS -> SS), and point-to-point in uplink direction (SS -> BS) Time Division Multiple Access (TDMA) in downlink direction, Time Division Multiplexing (TDM) in uplink direction Supports both Time Division Duplexing (TDD) and Frequency Division Duplexing (FDD) schemes For FDD, FYP Symposium (ELEC4890A) The University of Newcastle, Australia Scope | Overview & Background | MAC layer | Method | Current & Future | Summary 6 Downlink & uplink on separate RF channels Static asymmetry Half duplex – SS does not transmit & receive simultaneously (low cost)

Method of implementation Powerful and professional network simulation software Based on C/C++ programming language Object oriented Combine with different models – network model (top level), node model (middle level) and process model (bottom level) Be able to obtain and analysis different traffic statistics FYP Symposium (ELEC4890A) The University of Newcastle, Australia Scope | Overview & Background | MAC layer | Method | Current & Future | Summary 7 What is OPNET?

FYP Symposium (ELEC4890A) The University of Newcastle, Australia Scope | Overview & Background | MAC layer | Method | Current & Future | Summary 8 Next to see the conceptual model for the WiMax network MAC layer implementation (node model) Basic WiMax model (network model) BS and SS connect to two common buses, one for Tx., and one for Rx. Node mode and process model are built inside Two transmitters and receivers directly connected to the MAC node Node model that is built inside the network model above WiMax Model

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Current progress and results FYP Symposium (ELEC4890A) The University of Newcastle, Australia Scope | Overview & Background | MAC layer | Method | Current & Future | Summary 10 Learning OPNET programming language, and obtain experiences in building OPNET models Structuring on how to build the node model and the process model of MAC layer Modifying the source-sink model so the it is able work under wireless environment between 2 nodes (in network model) Modifying the source-sink model with a single BS with communicates with multiple SSs.

Process model (Sink) Process model (Source) Network model Node model Source-sink model

Future work Design and implement the model with MAC layer functionalities, together with necessary frames, subframes and packet formats Implement the MAC layer model into BS and firstly communicates with a single SS, then to multiple SSs Obtain traffics statistics from different scenarios FYP Symposium (ELEC4890A) The University of Newcastle, Australia Scope | Overview & Background | MAC layer | Method | Current & Future | Summary 12

…Thank you for your attentions… Questions !? FYP Symposium (ELEC4890A) The University of Newcastle, Australia 23/6/2005 Copyright: Chung Kei IP 13