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An Introduction to

Institute for Information Industry (III)

and IEEE 802.16j simulation module

WiMAX Technology Center

Networks and Multimedia Institute

Institute for Information Industry

Howard Lin

2007/10/24

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Agenda

• Introduction to III and WiMAX Technology Center

• IEEE 802.16j WiMAX Relay Networks Overview

• III’s status of NS-2 Simulation

• Collaboration with AATG

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Introduction To III• The Institute for Information Industry (III) was established in 1979 as a no

n-profit organization, for the purpose of growing and strengthening Taiwan's information industry development.– Jointly sponsored by the Taiwan government and dozens of prominent

private enterprises• III’s mission has evolved from IT to ICT (Information and Communications

Technology) development, with coverage expanding from ICT industries to entire society.

• III employs approximately 1,500 personnel, and approximately 70% hold master's or doctoral degrees.

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Networks and Multimedia Institute• Networks and Multimedia Institute (NMI) is the primary ICT technology

research organization within III.• Its current research areas include Wireless Access, Ubiquitous Networks,

Content Sharing, Digital Home, Context-aware Service Platforms, Sensor Networks, and Smart Mobile Devices.

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Networks and Multimedia Institute

PAO-CHUNG HOVice President andGeneral Director

CHIA-HSIANG CHANGGeneral Director

Operation SupportDepartment

Information SecurityTechnology Center

Mobile MultimediaTechnology Center

WiMAX TechnologyCenter

Environment Sensing and Control

Technology Center

Mobile CommunicationTechnology Center

Market and Business Promotion Department

Technology Plan Department

CHUN-DER WUAdvisor

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III Plays a Key Role in Taiwan WiMAX

Ubiquitous Society,National

Competitiveness

M-TaiwanM-Taiwan

WiMAXTest Lab

WiMAXOperator

WiMAXChipsetVendor

WiMAXProductVendor

WiMAXTest Capability

WiMAXStandard

Contribution

WiMAX BSSW Core Tech

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WiMAX Activities in III WiMAX Center

• WiMAX SS/BS Software Development– 16d/e/j BS/RS system integration and R1/R6 interoperability– Real credit from international WiMAX plugfest (16d/e)– Help Taiwan manufacturers build WiMAX product development and int

egration capabilities• Participate in IEEE 802.16j/m Standardization Activities

– Co-propose key contributions with 1st-tier global companies– Focus in usage models, technical requirements, MAC layer, and syste

m profile• Establish “M-Taiwan WiMAX Testing Center”

– Include WiMAX PCT, RCT, and IOT for 802.16d/e CPE and BS– Develop WiMAX test cases along with commercial test equipments– Help Taiwan WiMAX laboratories build WiMAX test capabilities and wi

n WFDCL (WiMAX Forum Designated Certification Laboratory) • Direct links to the local/global academia

– Co-operate with Universities and do research in WiMAX field

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NS-2 WiMAX module project in III• The NS-2 Project is a research-oriented project under WiMAX Center in III

– It’s a small project to do research on academic issues.– Provide a good platform to verify the performance for advanced algorithms.

• Had been co-operating with Chang-Gung Univ. (CGU) since 2006– CGU’s previous work : http://ndsl.csie.cgu.edu.tw/wimax_ns2.php– It is another popular WiMAX module for NS-2.– The paper entitled “The Design and Implementation of WiMAX Module for

ns-2 Simulator ” has been presented in Proc. ACM VALUETOOLS 2006 in Pisa, Italy.

• Starting from 2007– Leverage past experience, based on NIST’s prereleased-041507 – Team Members :

• Frank Tsai , PhD. (Manager)• Howard Lin (project lead)• Cheng-Jung Lin• Francis Lien• Yeng-Chieh Cheng

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An overview of IEEE 802.16j

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Concept of Multihop Relay Lower CAPEX & OPEX approach to expand WiMAX infrastructure

Coverage extension at cell edge

Penetration into inside room

Shadow of buildings

Coverage hole

Underground

Valley between buildings

Coverage extension to isolated area

Multihop Relay

Mobile Access

BS RS

RS

RS

RS

RS

RS

Problems:1. Shadow of buildings2. Valley between buildings3. Coverage extension at cell edge

Problems:1. Shadow of buildings2. Valley between buildings3. Coverage extension at cell edge

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802.16j Multi-hop Relay• Aiming at developing relay mode based on IEEE 802.16e, to gain:

– Coverage extension, and– Throughput enhancement

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16j Relaying Methods

Non-transparent RS• A non-transparent RS transmits preamble,

FCH, DL-/UL-MAP, and DCD/UCD• MS recognizes the non-transparent RS as a

BS• Centralized scheduling or distributed

scheduling• Capacity enhancement & range extension

Transparent RS• A transparent RS does not transmit preamble,

FCH, DL-/UL-MAP , and DCD/UCD• MS never recognizes the transparent RS as a

BS• Centralized scheduling at MR-BS• Capacity enhancement only• UL only RS or UL/DL RS

Source: 16j TG, 80216j-06_132

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III’s Contribution in 16j• Standardization of 802.16j is in final stage

– 1st draft have been official released by IEEE 802.16 in Aug 2007– There are many major contributions and essential IPRs owned by

III – 802.16j standard will be finalized and approved by IEEE 802 in Q1 200

8• 170 1st-author contributions have been submitted

– Reference: http://relay.wirelessman.org/• 67 contributions have been approved as standard baselines

– Approval rate: 39.41% (of III’s 170 contributions)– 37.85% of total approved contributions in 16j (177 approved contributio

ns in total)

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III’s status of NS-2 Simulation

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What we did and have done

• Studies NIST’s architecture and CGU’s– Our team decide to follow NIST’s, which integrate into AATG’s

• Enhanced code from NIST’s prereleased-041507 – Support sleep Mode– Partially 16j Relay

• Sleep mode– Finish Power saving class of type I– A paper about 16e power saving using sleep mode module was published in a Taiwan local conferen

ce WASN 2007.– Add TCL interfaces

• Initial-sleep window• Final-sleep window base• Listening window• Final-sleep window exponent

– Add Timers• WimaxT43Timer • WimaxSlpTimer

– Add messages• MOB_SLP-REQ• MOB_SLP-RSP• MOB_TRF-IND

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What we did and have done (con’t)

• IEEE 802.16j development– 16j implementation base on IEEE-std 16j/D1 (Aug. 2007)– Transparent, UL-only, centralized scheduling Relay mode– Add a Relay component by modifying BS and MS– Finish partial 16j message exchange process

• AATG Release 2.1 package verification– We have installed the package and it works fine for us– Cost 231 model seems to be more realistic, but may have

some issues in wireless-phy.– Continue to feedback

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RS Initial RNG

• RS initial ranging with MR-BS• RS will start by sending a

randomly selected CDMA-Initial Ranging Code.

• Then RS will finish ranging process by exchange RNG-REQ/RSP.

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RS Registration

• RS has to continue registration process followed by successful ranging.

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MS/SS initial RNG

• After MS launches, RS has to forward messages and act as a middle man to help communicating with MR-BS.

• MR-BS can send Downlink messages to MS directly, but MS can not reach MR-BS in Uplink direction due to Tx power limitation.

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MS/SS Registration

• MS will perform registration process assisted by RS.

• After the connections been established, the MS can transmit data to MR-BS without knowing the existence of RS.

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What III plan to Do

• Continue our efforts to develop WiMAX NS2 platform– In addition to 802.16j standard participation, we also plan to participate

in 802.16m. (and see the need to have a simulator for system simulation for our product development)

• As NS2 is a shared, open resource, we do our development based on others work and also happy to contribute ours in returns.

• In addition to 802.16e, we plan to keep on the development of 802.16j MR MAC modules

• Spend time on verifying the preliminary Release 2.1; In the mean time, we will also consider the impact on porting 16j into the new structure.

• After the Release 2.1 verification, we can discuss about how we can contribute to next release version.

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Collaboration with AATG• Collaboration

– Share experiences with each other– Leverage the resources and capacity

• III’s mission – Focus on 16j module development based on 16e and OFDMA module– Supporting sleep mode (Type I) in 16e

• NS-2 weekly meeting by con calls– Time difference in Taipei

Eastern Time, U.SPacific Time, U.S Taipei Time, Taiwan

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Thank You!

Any Questions ?

E-mail : ihlin@nmi.iii.org.tw

Howard Lin

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Tree Structures for Relay, not Mesh• Requirements:

– PMP mode compatible– 16e mobile station (MS) Support

– <- Those are not supported by current 16-mesh thus

require new spec.

Source: 16j SG Tutorial, 80216mmr-06_006

Source: 16j TG, 80216j-06_015

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Tentative Schedule of 16j

Year Month 802.16 SessionActions2007 May #49 Interim 7th TG meeting

July #50 Plenary8th TG meeting, Comment ResolutionsPreparation for the Initial WG Letter Ballot

Initial Draft Completion, 1st WG Letter Ballot

September #51 Interim9th TG meeting, Comment ResolutionsPreparation for the 2nd WG Letter Ballot

2nd WG Letter Ballot

November #52 Plenary10th TG meeting, Comment ResolutionsPreparation for the 1st Sponsor Ballot

1st Sponsor Ballot

2008 January #53 Interim11th TG meeting,Sponsor Ballot Comment Resolutions

Sponsor Recirculation

March #54 Plenary12th TG meeting,Sponsor Ballot Comment ResolutionsEC Approval to Submit to RevCom

RevCom Approval*SA Approval

*Submission for RevCom approval will come after REV2 completed.

Source: IEEE 802.16