www.wimax.rohde-schwarz.comwww.mimo.rohde-schwarz.com

Downlink subframe

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e-mail VoIP VoIP

Packet reconstruction

CID3 CID2

Header data CRC

Data decryptionCID check

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The Mobile WiMAXTM (worldwide interoperability for microwave access) air interface is based on the IEEE 802.16e-2005 standard. It applies the latest transmission technologies, including OFDMA and MIMO, to increase the data rate and robustness. The WiMAX Forum® (WMF) has defined a range of profiles and conformance test procedures to ensure compatibility and interoperability of different WiMAX products.

By applying WiMAX, the Internet goes mobile, offering high-speed access anywhere at any time. High data rate is achieved by applying adaptive modulation, which also allows reliable transmission even over long distances.

Rohde & Schwarz supports WiMAX with the widest range of T&M products and provides unique solutions for MIMO and production testing.

The IEEE 802.16 WiMAX standard describes the two lowest layers of the open systeminterconnection (OSI) reference model for communications, also known as the PHY(sical) layer and MAC (media access control) layer. WiMAX operates package-switched and connection-oriented – each package is assigned to a connection ID (CID), and each connection is described by the quality of service (QoS).

The basic tasks of the MAC and PHY layers are shown below.

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WiMAXTM System Overview

HTTP e-mail VoIP video HTTP VoIP

CID1 CID2 CID3 CID4 CID1 CID3

…CID1… data CRC

HTTP video HTTP

Packet reconstruction

CID1 CID4

Header data CRC

Data decryptionCID checkMAC PDU

Downlink subframe

MS 1

MAC layer overview

Higher application layers

MAC service specifi c convergence sublayer

MAC common part sublayer

MAC security sublayer

PHY layer

PHY layer overviewProperties IEEE 802.16e-2005

Frequency range 2 GHz to 11 GHz

Modulation BPSK, QPSK, 16QAM, 64QAM

Multiple access scalable OFDMA 128 to 2048 FFT, TDMA, OFDM 256 FFT, SC

Duplex (DL / UL) TDD / FDD

Channel bandwidth 1.25 MHz to 28 MHz in line with local regulations

Peak data rate 114 Mbit/s (DL, 20 MHz, 2x2 MIMO, TDD)

Mobility 60 km/h

Communications distance 1 km to 5 km typ., 30 km max.

Band class index

Frequency range Channel bandwidth

FFT size Duplexing mode

Profile name

1 2.3 GHz to 2.4 GHz 5 MHz 512 TDD 1B

10 MHz 1024 TDD

8.75 MHz 1024 TDD 1A

2 2.305 GHz to 2.320 GHz 3.5 MHz 512 TDD 2A

2.345 GHz to 2.360 GHz 5 MHz 512 TDD 2B

10 MHz 1024 TDD 2C

3 2.496 GHz to 2.690 GHz 5 MHz 512 TDD 3A

10 MHz 1024 TDD

4 3.3 GHz to 3.4 GHz 5 MHz 512 TDD 4A

7 MHz 1024 TDD 4B

10 MHz 1024 TDD 4C

5 3.4 GHz to 3.8 GHz 5 MHz 512 TDD 5A

7 MHz 1024 TDD 5B

10 MHz 1024 TDD 5C

3.4 GHz to 3.6 GHz 5 MHz 512 TDD 5AL

7 MHz 1024 TDD 5BL

10 MHz 1024 TDD 5CL

3.6 GHz to 3.8 GHz 5 MHz 512 TDD 5AH

7 MHz 1024 TDD 5BH

10 MHz 1024 TDD 5CH

WiMAX parameters

WiMAX Forum profiles

R&S®CMW270 WiMAXcommunication testerI First and scalable all-in-one solutionI Frequency range up to 6 GHzI Realtime full signaling

R&S®FSQ signal analyzerI WiMAX Wave2 solution integratedI Fast speed and highest accuracyI 120 MHz demodulation bandwidthI Best dynamic range

R&S®TS8970 WiMAX radio conformance test system (RCTT)I RCTT selected by WiMAX ForumI Fully automated test setupI Modular system concept (IEEE 802.16e, Wave1/Wave2, BS/MS)I Continuous implementation of latest specifications

R&S®SMU200A signal generatorI Two signal generators in one I Outstanding signal qualityI MIMO testing option implementedI Unique internal fading simulation

Preamble FCHDL MAP

PUSC Zone #1Segments 0 and 1

PUSC Zone #2(use all SC)Segment 0

FUSC Zone #1Segment 0

AMC Zone……

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OFDMA symbol number

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0 1 2Time domain

Downlink TTG Uplink RTG

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Selection of T&M products for WiMAX

WiMAX glossary

AAS = Adaptive Antenna System; ACK = Acknowledgment; AMC = Advanced Modulation and Coding; BS = Base Station; BTC = Block Turbo Coding; BPSK = Binary Phase Shift Keying; BRS = Broadband Radio Service; BW = Bandwidth; BWA = Broadband Wireless Access; CC = Convolutional Code; CID = Connection ID; CINR = Carrier to Interfearer Noise Ratio; CP = Cyclic Prefi x; CRC = Cyclic Redundancy Check; CTC = Convolutional Turbo Coding; DCD = Downlink Channel Descriptor; DFS = Dynamic Frequency Selection; DL = Downlink; DLFP = Downlink Frame Prefi x (FCH); FCH = Frame Control Header (DLFP); FDD = Frequency Division Duplex; FUSC = Fully Used Sub-channelization; H-ARQ = Hybrid Automatic Repeat Request; HFDD = Hybrid Frequency Division Duplex; IE = Information Element; ISI = Intersymbol Interference; LDPC = Low Density Parity Check Code; LLC = Logical Link Control; MAC = Media Access Control; MIMO = Multiple Input Multiple Output; MMDS = Multichannel Multipoint Dis-tribution System; MS = Mobile Station; OFDM = Orthogonal Frequency Division Multiplex; OFDMA = Orthogonal Frequency Division Multiple Access; PDU = Protocol Data Unit; PICT = Product Implementation Conformance Statement; PUSC = Partly Used Subchannelization; QPSK = Quadrature Phase Shift Keying; RCT = Radio Conformance Test; RSSI = Received Signal Strength Indication; RTG = Receive Transition Gap; SC = Single Carrier; SOFDMA = Scalable Orthogonal Frequency Division Multiple Access; TDD = Time Division Duplex; TDMA = Time Division Multiple Access; TSS&TP = Test Suite Structure & Test Purpose; TTG = Transmit Transition Gap; UCD = Uplink Channel Descriptor; UIUC = Uplink Interval Usage Code; UL = Uplink; U-NII = Unlicensed National Information Structure; WCS = Wireless Communications Service; WiBro = Wireless Broadband; WiMAX = Worldwide Interoperability for Microwave AccessWiMAX and Mobile WiMAX are trademarks of the WiMAX Forum

In the downlink, the PUSC zone can be divided into up to three segments. One segment can be allocated to up to six subchannel groups. Each segment contains an FCH, a DL MAP and a UL MAP. This example shows two segments. The downlink includes an FUSC zone. Zones differ by subcarrier allocation. For WiMAX, adjacent and distributed subcarrier allocations are defined. For Mobile WiMAX, distributed subcarrier allocation ensures better performance in case of fading.

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CID1 CID2 CID3 CID4

…CID1… encrypted CRC

Burst #3MAC PDUs

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WiMAX_po_en_A1_hoch_unfolded_5213-7454-82_v0202.indd 1 28.05.2008 09:41:31