WiMAX Air Interface
- Duration: 2 days or 12 hours
- Level: Level 3
WiMAX Air Interface
The IEEE 802.16 study group have shaped the format and operation of the WiMAX air interface, for both fixed and mobile based services. The WiMAX Forum have responsibility for all aspects of interoperability of the air interface through their certification program. For both parties, work has included the utilization of the OFDM and OFDMA multiplexing techniques, physical frame structure and MAC protocols. This course examines the work done by the IEEE 802.16 group and the WiMAX Forum. Those attending this course should have a good knowledge of WiMAX as would be gained by attending mpirical’s WiMAX System Engineering course.
Who Should Attend
Research and Development Staff requiring detailed instruction in the operation of the WiMAX Air Interface. Radio Engineers and Planning Staff involved in the deployment and management of WiMAX Networks.
Divided into 7 sections, the topics covered will include:
Section 1: WiMAX Architecture and Profiles (2 hours)
- WiMAX Air Interface Architecture - Mobile Stations, Subscriber Stations, WiMAX Base Stations.
- Profiles - System Profiles, Fixed System Profile and Mobile System Profile.
- Certification Profiles, Certified Equipment.
- Network Releases - WiMAX Release 1, 1.5 and 2 Specifications.
Section 2: Medium Access Control (2 hours)
- MAC Architecture - Service-Specific CS, MAC CPS and Security Sublayer.
- MAC Formatting - Generic MAC Header, System Constant CID Values, MAC Identities and CIDs.
- Uplink Signalling Headers, Uplink Signalling Type I and Type II headers and functions.
- MAC Management Messages - formats and Subheaders and special payloads.
- Bandwidth Requesting, Resource Allocation, Feedback and Reporting, Sleep Mode and Power Control.
- MAC ARQ, HARQ and Security.
- IP Convergence Sublayer and Ethernet Convergence Sublayer.
Section 3: The WiMAX Physical Layers (0.5 hours)
- Physical Layer Functions and Processes - Randomization, FEC, Framing.
- Interleaving, Filters, Baseband Pulse Shaping and Power Control.
Section 4: WiMAX OFDM (1.5 hours)
- WirelessMAN-OFDMTM Features - OFDM Cyclic Prefix, Subchannelization, Subcarrier Spacing.
- Framing - Downlink Subframe, Uplink Subframe, TDD Subframes, Downlink Subchannelization Zone.
- Channel Coding - Randomizer, FEC (Forward Error Protection), Interleaving.
- MESH Operation, System Performance, Channelization for Licensed Bands and Receiver SNR Requirements.
Section 5: WiMAX OFDMA (3 hours)
- OFDMA Terminology - Channel Bandwidth, Subcarriers and OFDM/OFDMA Symbols, Sample Rates and Subcarrier Spacing.
- Subchannel Permutations - OFDMA Allocation, Data Regions and Segments, PUSC, FUSC, OPUSC, AMC.
- Data Mapping - Downlink Mapping and Uplink Mapping.
- Frame Structure - Preamble, OFDMA Frame with Multiple Zones, FCH - DL Frame Prefix, Logical Subchannel Numbering.
- PUSC Downlink Subcarrier Subchannel Allocation and Clusters Structure.
- FUSC Allocation - Tile Usage of Subchannels, Uplink Allocation.
- Coding and Modulation - FEC Encoding, Bit-Interleaving, Repetition, Modulation and Receiver Sensitivity.
Section 6: WiMAX Initial Procedures (1.5 hours)
- Network Entry Phases - Scanning for a Downlink Channel, DL-MAP Message, DCD Messages and DIUC.
- Obtain Uplink Parameters - UCD Message, Uplink Burst Profile, UIUC and UL-MAP Messages.
- Initial Ranging and Automatic Adjustment - Initial Ranging, Invited Ranging and Periodic Ranging.
- Negotiating Basic Capabilities - Physical, Bandwidth Allocation, Power Save Class, Security and MAC Header Formats.
- Authorization & Key Exchange and Registration.
- Establishing IP Connectivity.
- Power Control, Closed Loop Power Control, Optional Open Loop Power Control and Fast Power Control.
- Sleep Mode - Power Optimization, Power Saving Classes, Capabilities and Activation.
Section 7: WiMAX Mobility (1.5 hours)
- Broadcast Information - DCD Mobility Information, Hard Handover Parameters, Neighbour Advertisements.
- Scanning - Scanning Request and Response, Scan Reports.
- Handovers - Hard Handover, Macro-Diversity Handover and Fast Base Station Switching Handover.
- Idle Mode Operation - Entry into Idle Mode, Paging Operation, Cell Selection and Reselection and Location Update.