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Telecommunications Technology Association IMT WiBro Project Group(PG702) WiBro TM Overview April 2008

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Page 1: Wibro Overview

Telecommunications Technology AssociationIMT WiBro Project Group(PG702)

WiBroTM Overview

April 2008

Page 2: Wibro Overview

B Team - Mobile Portal Business

Contents

WiBro overviewII

Korea StandardizationIIII

IEEE802.16 & WiMAXIIIIII

Page 3: Wibro Overview

B Team - Mobile Portal Business

WiBro overviewPART IPART I

Page 4: Wibro Overview

B Team - Mobile Portal Business

Portable Internet Service (WiBro) is to provide a high data rate wireless internet access with PSS (Personal Subscriber Station) under the stationary or mobile environment, anytime and anywhere.

DefinitionDefinition

『 Portable Internet 』 was named as 『 WiBro 』 . (End of April, 2004) WiBro : Wireless Broadband

ReferenceReference

I. WiBro - Definition

WiBroWiBro

Low Cost Anytime,Anywhere

Mobility HighData Rate

Page 5: Wibro Overview

B Team - Mobile Portal Business

Internet Access

High Data Rate

Anytime, Anywhere

Stationary or Mobile

• Stationary/Mobile• mid-mobility (~60Km/Hr)

• Indoor/outdoor• Seamless access

• over 1Mbps• High-speed Multimedia

• User Terminal : Notebook, PDA, Handset

Definition

Concept

Much lower service charges than EV-DO Much higher-speed Internet access than EV-DOMobile Internet access in high-speed mobile environmentMuch wider coverage than wireless LAN-based services

I. WiBro - Definition

Page 6: Wibro Overview

B Team - Mobile Portal Business

WLLFixed

High Mobility

IMT2000(3G)

MobilityMobility

2.4GHz Wireless LAN

WiBro

User Data Rate

ADSL/HFC/B-WLL

The next Generation Multimedia Service

Cellular PCS(2G)

II. WiBro - Positioning

Page 7: Wibro Overview

B Team - Mobile Portal Business

1.92 1.98 2.11 2.17 2.30 2.33 2.37 2.40 2.4835 5.725 5.825 [ GHz]

40MHzHTIHTI(20)(20)

2.4GHz2.4GHz(83.5)(83.5)

5.8GHz5.8GHz(100)(100)

AA(20)(20) BB CC 130MHz AA BB CC KK

TT HTIHTIKKTT

IMT2000 WLL ISM ISMISM

KTKT(UP)(UP)

2.30 2.31 2.33 2.37 2.38 2.40 [ GHz]

HTiHTi(UP)(UP) GUARD BAND KTKT

(DOWN)(DOWN)HTiHTi

(DOWN)(DOWN)

10MHz 20MHz 40MHz 10MHz 20MHz

WLL

WiBro

1FA=9MHz

2300MHz 2400MHzBand 1(SKT) Band 2(KT) Band 3(TBD)

Guardband=4.5MHz Guardband=10MHz

Fixed & Mobile

Fixed

III. WiBro – Frequency Allocation

Page 8: Wibro Overview

B Team - Mobile Portal Business

IV. Key Factors of WiBroMajor DecisionMajor Decision

The TTA PG702 Meeting of Jan 31, 2004 approved the Major System Parameters & Radio Access Requirements as follows.

TTA changed Standardization committee name from PG302 to PG702 according to reorganization of TTA standardization committee (Dec. 2007)

Major SystemMajor SystemParametersParameters Radio Access RequirementRadio Access Requirement

TDDTDD Frequency Reuse Frequency Reuse FactorFactor

DuplexingDuplexing 11

OFDMAOFDMAMultipleMultipleAccessAccess

8.75 [MHz]8.75 [MHz]ChannelChannelBWBW

MobilityMobility ≤ ≤ 60 [Km/h]60 [Km/h]

Service CoverageService Coverage ≤≤ 1 [Km]1 [Km]

Spectral EfficiencySpectral Efficiency[bps/Hz/cell(sector)][bps/Hz/cell(sector)]

Max. DL / UL = 6 / 2Max. DL / UL = 6 / 2Aver. DL / UL = 2 / 1 Aver. DL / UL = 2 / 1

HandoffHandoff ≤≤ 150 [ms]150 [ms]

ThroughputThroughput(per user)(per user)

Max. DL / UL = 3 / 1 [Mbps]Max. DL / UL = 3 / 1 [Mbps]Min. DL / UL = 512 / 128 [Kbps]Min. DL / UL = 512 / 128 [Kbps]

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V. Network Architecture of WiBroNetwork Architecture of WiBroNetwork Architecture of WiBro

ACR : Access Control RouterACR : Access Control Router

RAS : Radio Access StationRAS : Radio Access Station

PSS : Personal Subscriber StationPSS : Personal Subscriber Station

PSS

HA

RAS

PSS

ACR

AAA

Public IP Network

ACR

PSS

Operator’sIP Network

PSS

RASRASRAS

……

Page 10: Wibro Overview

B Team - Mobile Portal Business

VI. WiBro Business in Korea

3 Operators are selected at February 2005. KT, SKT, (TBD)

OperatorsOperators

27 MHz per operator Band#1 : 2300 ~ 2327MHz (SKT) Band#2 : 2331.5 ~ 2358.5 MHz (KT) Band#3 : 2363 ~ 2390 MHz

FrequenciesFrequencies

Trial Service during 1Q of 2006. Launching Commercial Service : June 30, 2006 StatusStatus

Page 11: Wibro Overview

B Team - Mobile Portal Business

Korea StandardizationPART PART IIII

Page 12: Wibro Overview

B Team - Mobile Portal Business

I. Committee Structure & ToR of PG702

* ToR : Terms of Reference

Radio AccessWorking Group

IMT WiBro Project Group

(PG702)

Service and NetworkWorking Group

International Coordination

Ad Hoc

Radio Access Standardization on IMT WiBro

Radio Access Standardization for In-building WiBro

International Coordination and Collaboration Activities (IEEE 802.16 and ITU-R WP5D, etc.)

Standardization related to Service and Network on IMT WiBro

International Coordination and Collaboration activities related to Service and Network on IMT WiBro

International Coordination Activities related to IMT WiBro (IEEE 802.16, ITU-R WP5D, WiMAX, CJK and TTA PG701, etc.)

Analysis of International Standardization and Progress related to IMT WiBro

IOT/CT Working Group

Standardization of Profiling, Interoperability and Conformance Test on IMT WiBro

Coordination and Collaboration activity with WiMAX Forum

Page 13: Wibro Overview

B Team - Mobile Portal Business

Radio Access Standardization for WiBroPurpose: Revision of WiBro standard in order to harmonize with IEEE802.16Status: Adopted WiBro Phase2 Standard (TTAS.KO-06.0082/R1,Dec.2005)

It is a subset of IEEE802.16 Profiles

Service & Network Standardization for WiBro

Purpose: To complete Service requirements and network reference model of WiBro. & To complete Specifications for interoperability between WiBro and other network such as WLAN, 3G, DMB, etc.

Status: TTAR-0017(2.3GHz Portable Internet-Service/Network requirements)TTAR-0018(2.3GHz Portable Internet-Network Reference Model)Working requirements for interoperability between WiBro and other network such as WLAN, 3G etc.

II. TTA PG702 Activities for WiBro Standardization (until now-1)

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B Team - Mobile Portal Business

Purpose: To guarantee interoperability between WiBro equipments/ between WiBro service carriers

StatusTTA adopted IOT/CT Standard at Dec. 2005. and then, in order to harmonize between WiBro and Mobile-WiMAX, IOT/CT Standards is being revisedWe hope that WiBro equipments get the first Mobile-WiMAX certification.

IOT/RCT Standard for WiBro

PISIM (WiBro Subscriber Identity Module) Standard

Purpose: Apply function on Subscriber Identity module to WiBro

Status Adopted Mutual Authentication Standard(TTAS.KO-06.0110/R1, June.2006) Registered RID (Registered Application Provider Identifier) for WiBro

service to ISO

II. TTA PG702 Activities for WiBro Standardization (until now-2)

Page 15: Wibro Overview

B Team - Mobile Portal Business

Definition of Service and System Requirements for enhanced

WiBro

Study on adaptation of MMR

Requirements for interworking between WiBroTM and others

IPR and international cooperation activities

Study on further enhancements of WiBroTM standard

Revision of IOT/RCT spec.

Etc.

III. Future Plan of PG702 (1)

Page 16: Wibro Overview

B Team - Mobile Portal Business

TTA PG702 will follow the plan for IMT-Advanced specification

through consensus building and collaboration with other SDOs.

20082008 2009200920072007 20102010

Evaluation onOFDMA TDD WMAN

Study onWiBro Evolution and additional Standardization

for IMT-Advanced

CONSENSUS BUILDING /Collaboration

with , etc.CJKCJK

III. Future Plan of PG702 (2)

Page 17: Wibro Overview

B Team - Mobile Portal Business

IEEE802.16 and WiMAXIIIIII

Page 18: Wibro Overview

B Team - Mobile Portal Business

I. IEEE802.16 Body

Working Group on Broadband Wireless Access Chair : Roger B. Marks (NIST)

Task GroupTGe* : enhancement to support mobility (session closed)

Maint* : corrigendum to IEEE std802.16-2004TGh : amendment for license-exempt optionsTGc : amendment for conformance testTGf/g : MIB and Management Plane proceduresMMR SG : Mobile Multihop Relay

* TTA PG302 works for harmonization with TGe and Maint

Page 19: Wibro Overview

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II. Closing of 802.16 TGe

IEEE 802. 16 e Sponsor Ballot

2005

IEEE 802.16 Maint

Sponsor Group Ballot

11 33 55 77 99 1111

Publish

Page 20: Wibro Overview

B Team - Mobile Portal Business

Fixed Wireless (TGd)IEEE Std 802.16-2004 : published on Oct. 1, 2004As a revision of IEEE Standard 802.16-2001 (as amended by IEEE Standard 802.16c-2002, and IEEE Standard 802.16a-2003).

Mobility Support Enhancement (TGe)IEEE Std 802.16e-2005 : Published on Feb. 28, 2006(including 802.16-2004/Cor1)P802.16e standard approved by IEEE-SA on Dec. 7, 2005. - Amendment for Physical and Medium Access Control Layers for

Combined Fixed and Mobile Operation in Licensed Bands below 6 GHz

WiBro Specification = Subset of Consolidated version of “IEEE Std. 802.16-2004 + P802.16e +P802.16-2004/Cor1.”

III. WiBro and IEEE 802.16

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Relationship between WiBro and IEEE 802.16.

IEEE Standard 802.16-2004(SC, SCa, OFDM, OFDMA PHY mode with Single IEEE 802.16 MAC)

IEEE P802.16-2004/Cor1(To correct errors, inconsistencies, and ambiguities in IEEE Standard 802.16-2004)

IEEE P802.16e(Combined Fixed and Mobile Operation in Licensed Bands below 6 GHz)

WiBro (Complete Subset of IEEE 802.16)•Should support the IEEE Standard 802.16-2004 and IEEE P802.16e and provide the 5 criteria (TDD, FRF=1, 60km/hr mobility support, FA >= 9 MHz, roaming between operators, etc)•Shall support the Mandatory Features of IEEE 802.16.•WiBro Profile = the set of functionalities configuring every mandatory features and many optional features of 802.16e. • WiBro Air Interface Specification is fully compatible with IEEE P802.16e•WiBro Profiles and Test Specifications will be harmonized with WiMAX Forum’s currently developing Mobile WiMAX Profiles and Test Specifications. (Most of the major manufacturers are participating as the active members of WiBro and WiMAX.)

IV. Relationship between WiBro and IEEE 802.16

* FRF : Frequency Reuse Factor* FRF : Frequency Reuse Factor

Page 22: Wibro Overview

B Team - Mobile Portal Business

V. IEEE 802.16 Specifications

IEEE 802.16 MAC

WirelessMAN-SC

(TDD/FDD)

WirelessMAN-SCa

(TDD/FDD)

WirelessMAN-OFDM

(TDD/FDD)

WirelessMAN-OFDMA

(TDD/FDD)

WirelessHUMAN

(TDD)

10-66 GHz below 11 GHzlicensed bands

below 11 GHzlicensed bands

below 11 GHzlicensed bands

below 11 GHzlicense-exempt bands

AAS, ARQ,STC, Mobile

AAS, ARQ,Mesh, STC, Mobile

AAS, ARQ,Mesh, STC

AAS, ARQ,STC, Mobile

AASSector

DownlinkUplink

DL UL

FDD

TDD Mesh

Page 23: Wibro Overview

B Team - Mobile Portal Business

VI. WiMAX Forum

Scope Promote use of BWA products support 802.16 standard

Interoperability of all products support 802.16 standardPropose and promote access profiles for .16 standardCertify interoperability levels in network and cell

Board of Directors (13 Prs. from 12 companies)President and Chair: Ron Resnick, IntelVice President: Dr. Mohammad Shakouri, Alvarion

WiMAX Forum Member Companies340 companies

Page 24: Wibro Overview

B Team - Mobile Portal Business

VII. WiMAX Working Group

NWG : higher level network specification for fixed, nomadic and mobile.SPWG : Feedback from Service ProvidersTWG : conformance and interoperabilityCWG : evaluation of testing options

Page 25: Wibro Overview

B Team - Mobile Portal Business

WiBro PHY and MACAnnexAnnex

* This Overview was produced based on a revised * This Overview was produced based on a revised version of Phase I WiBro Spec. (December 2004)version of Phase I WiBro Spec. (December 2004)

Page 26: Wibro Overview

B Team - Mobile Portal Business

ContentsI Introduction of PHY Specification-feature

II Parameter of WiBro specification

III Frame Structure

IV Pilot Tone

V Summary of Key Features

VI Introduction of MAC

Page 27: Wibro Overview

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Supporting High spectrum efficiency

• TDD: Minimize guard-band Maximize available frequency resource

Synchronous RAS is required

• 10 MHz broadband / OFDMA

Minimized MPI Enhanced transmission efficiency

• Using CTC with QPSk/16/64 QAM modulation CTC(Convolutional Turbo Code) Enhanced transmission rate with

respect to SINR perspective

Supporting wide Coverage

• With supporting of Frequency reuse factor ‘1’

Higher spectrum efficiency and Easy deployment of RASs

Using Reed Solomon sequence based Diversity subchannel minimize other RASs interferences

In the Cell edge with bad SINR area, The operation guaranteed with Low rate FEC

• Supporting Safety Channel in order to reduce interference of the Cell edge area

I. Introduction of the PHY Specification – feature (1/3)

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I. Introduction of the PHY Specification – feature (2/3)

Performance enhancement features consider mobility

• H-ARQ

Enhanced link performance guaranteed

• For low mobility user, supporting of “the Band selection AMC subchannel” increase transmission rate and

coverage

Allocate good channel status band for each appropriate user increase the transmission rate

Terminal measure the channel status, request either the “Band selection AMC” or “Diversity” Subchannel

Diversity Subchannel is suitable to the mobile user: Maximum separated tone are allocated for frequency

diversity

• Guarantee the 60 km/h mobility

Short OFDM symbol length minimize the degradation due to the mobility

The pilot structure supporting channel estimation under mobility

Page 29: Wibro Overview

B Team - Mobile Portal Business

Flexible resource allocation for multiple subscriber

• TDD DL/UL duty rate

1:1, 2:1, 5:1 DL/UL duty ratios are available

• In order to support multiple subscriber scheduling algorithm

Management the status of individual terminals and packet scheduling algorithms are considered

Supporting various QoS

• Best Effort

• Real-time polling

• Non-real-time polling

Handheld support

• Supporting sleep mode reduced terminal power consumption

TDD Smart Antenna (optional feature)

• For slow mobility user, Apply the Smart Antenna increase the Coverage and TX rate

I. Introduction of the PHY Specification – feature (3/3)

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Parameter ValueDuplex TDD

Multiple Access OFDMA

System Bandwidth 10 MHz

Sampling frequency 10 MHz

Number of used tones 864 out of 1,024

Number of data tones 768

Number of pilot tones 96

Tone spacing 9.765625 kHz

Signal bandwidth 8.447 MHz

Ratio of cyclic prefix time to the basic OFDM symbol time 1/8

Basic OFDMA symbol time 102.4 s

Cyclic prefix time 12.8 s

OFDMA symbol time 115.2 s

TDD frame length 5 ms

Number of symbols in a frame 42

II. Parameters of WiBro specification (1/2)

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Downlink symbol parameter Value

Number of bands 24

Number of bins per band 4

Number of tones per bin 9 (8 data + 1 pilot tones)

Number of tones per AMC subchannel 54 (48 data + 6 pilot tones)

Number of tones per diversity subchannel 54 (48 data + 6 pilot tones)

Number of bins per AMC subchannel 6

Uplink symbol / tile parameter Value

Number of bands 24

Number of bins per band 4

Number of tones per bin 9 (8 data + 1 pilot tones)

Number of tones per tile 9 (8 data + 1 pilot tones)

Number of bins per AMC subchannel 6

Number of tiles per diversity subchannel 6

II. Parameters of WiBro specification (2/2)

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III. Frame Structure

...TTG RTG

DL UL

Band 3

Band B-2

5 ms

Band 1

Band 0

Band 2

Band B-1

BIN BIN

...

...

...

...

UL control symbols

...

...

...

...

...

TILE

......

PUSC Subchannelization

Diversity subchannelization

AMC Subchannelization AMC Subchannelization

Diversity subchannelization

Page 33: Wibro Overview

B Team - Mobile Portal Business

III. Frame Structure (Downlink PHY)

...

Band b-1

Bin for AMC subchannelBand b

Band b+1

...

...

...

A AA AD D A AP P A

...

... ...

Symbols

Preamble

...

...

...

...

Subcarriers forPUSC and diversity

Subchannel

D

Page 34: Wibro Overview

B Team - Mobile Portal Business

III. Frame Structure (Uplink PHY)

Bin

UL control symbol period

...

...

...

...

...Tile

...

Slot

...

Band 3

Band B-2

Band 1

Band 0

Band 2

Band B-1

Pilot subcarrierBin

Tile

Page 35: Wibro Overview

B Team - Mobile Portal Business

Rotated pilot tones

• In all the RAS/Sectors position of the pilot tone is colocated

• In each RAS/Sectors apply different PN cover is used to

differentiate each other

Supporting channel estimation for 60km/h mobility

• 2.35 GHz, 60 km/h

Doppler freq (fd)

=130.56 Hz

Coherence time(1/fd)

=7.66 ms

• DL pilot subcarrier rotation period

345.6 us <0.1* Coherence time

•Pilot sub-carrier•Data sub-carrier

time

freq

•AMC subchannel

Example for 2x3 type Bin

Organization for AMC Subchannel

IV. Pilot Tone (Downlink)

Page 36: Wibro Overview

B Team - Mobile Portal Business

Different pilot position for different subchannelization structure

• AMC subchannel: rotated pilot tones

• Diversity subchannel: locate in the center frequency of each tile

AMC subchannel Diversity subchannel

•allocated •pilot tone

•allocated •subchannel

•pilot tone allocated •to another terminal

IV. Pilot Tone (Uplink)

Page 37: Wibro Overview

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Multiple Access/Duplexing: OFDMA/TDD

Frame length: 5 msec

Bandwidth: 10MHz with 1k-FFT

Flexible subchannelization for band selection and diversity

Fast AMC (adaptive modulation and coding) subchannel based on uplink CQI

(channel quality indicator)

Full diversity subchannel by multiple symbol grouping

Preamble for Cell differentiation with different Random sequences

X. Summary of Key Features (1/2)

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Pilot tone based downlink and uplink

Separate ranging channel time slot

Safety channel

More efficient channel coding: convolutional turbo code and short block codes

H-ARQ with CTC in the downlink and uplink

Modulation level: QPSK(DL/UL), 16QAM(DL/UL), 64QAM(DL only)

Optional AAS (adaptive antenna system) support

X. Summary of Key Features (2/2)

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- System Access- Bandwidth Allocation- Connection set-up - Connection maintenance- QoS

- Authentication- Secure key exchange- Encryption

- Transformation ofexternal network datainto MAC SDUs;

- Payload header suppression

XI. Introduction of MAC : Reference Model

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B Team - Mobile Portal Business

XI. Introduction of MAC : General Overview

OFDMA PDU Construction

Flexible size Header + subheader + payload + optional CRC

PDU format

MAC subheader - Fragmentation subheader - Packing subheaders - ARQ Feedback Fragmentation Construction Packing -Packing for non-ARQ connections and ARQ-enabled connections

Protocol control Optional Sequence number comparison Four transmit states ( not sent, o outstanding, discarded and waiting-for-retransmission.)

ARQ

Receiver states (CRC-32 checksum) Uplink Scheduling Scheduling (UGS, rtPS, nrtPS and BE) BW allocation

Contention based CDMA bandwidth requests

Ranging

Ranging Ranging - Initial ranging(Random Access) - Periodic ranging(Invited / Random Access) - BW request ranging(Random Access)

Ranging Subchannel and a set of special pseudo-noise Ranging Codes

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3 management connection during initial RNG-REQ/RSP exchange

Basic CID

Primary Management CIDSecondary Management CID

Traffic CID1

Traffic CID2

Management connectionBasic connection

short, time-urgent MAC message

Primary management connection

longer, more delay tolerant MAC message

Secondary management connection

delay tolerant, standards based management messages(DHCP, TFTP, SNMP)

XI. Introduction of MAC : Addressing and Connection

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Uplink Service TypesReal-time Polling Service (rtPS)

MPEG video; To support periodic variable sized data packet.

Non-real-time Polling Service (nrtPS)High bandwidth FTP; To support variable sized Data by regular basis

Best Effort Service (BE)WWW; To support Best Effort Traffic

Uplink Bandwidth Request and Allocation PolicyrtPS (real-time Polling Service)

According to polling period set service negotiation, PSS transmit bandwidth request in contention free manner or piggybacking way. QoS Parameter : the Nominal Polling Interval, the Tolerated Poll Jitter, Packet Error Rate and the Request/Transmission Policy

nrtPS (non-real-time Polling Service)During periodic or non-periodic poll, PSS transmit Bandwidth request in contention free mannerQoS Parameter : the Nominal Polling Interval, the Minimum Reserved Traffic Rate, Maximum Sustained Traffic Rate, Request/Transmission Policy, Packet Error Rate, Traffic Priority

BE (Best Effort)Contention Based or Piggybacking manner.QoS Parameter : the Minimum Reserved Traffic Rate, the Maximum Sustained Traffic Rate, Packet Error Rate, the Traffic Priority

XI. Introduction of MAC : QoS & Uplink Scheduling

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XI. Introduction of MAC : PSS Initialization Overview

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RAS

PSS

1) DL Sync2) UL BurstInformation acquisition

PSS

RAS RAS

PSS

RAS

PSS

6) Backoff7) Ranging Code TX

RAS

PSS

UL-MAP

RAS

PSS

UL-MAP

RNG-REQ(MAC_Address)

8) Timing,Power, &FrequencyAdjustment9) RandomSubch, Symbol,Code selection10) RangingCode TX

SystemInfo CH/DL-MAP

3) UL-MAP Scan4) RandomSubch, Symbol,Code selection

5) Ranging CodeTX

RNG-REQ(Code)

RNG-RSP(Success)

PSS

RAS

PSS

RAS RAS

PSS

RNG-RSP(Management CIDs)

RNG-REQ(Code)

Binary-exponential

RandomBackoff

11) RNG-RSP(Success) RXmapped withtransmittedSubch,

Symbol, &Code

12) RNG-REQmessage TXwith MACAddress

13) RNG-RSP(ManagementCIDs) RX

Timer T3Expire

RNG-REQ(Code)

RNG-RSP(Continue)

XI. Introduction of MAC : Ranging Procedures

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Network Topology AcquisitionNetwork Topology Advertisement

Channel information for neighboring RAS normally provided by DCD/UCD messagePSS Scanning of neighbor RAS

RAS/PSS may allocate/request time intervals to PSS’s for the purpose of seeking and monitoring neighbor RAS suitability as targets for HO

Association ProcedurePre-Calibration of Ranging Parameter before actual Handover using Ranging

HO ProcessCell Selection

The process of PSS scanning and/or Ranging one or more RAS in order to determine suitabilityHO Decision and Initiation

RAS initiated Handover RequestMS initiated Handover Request

HO CancellationHandover Cancellation by PSS’s discretion before actual handover

Target RAS scanning and synchronizationTermination with the Serving RAS

Ping Pong during HOReport of Ping Pong effect by PSS to target RAS

Network entry/re-entry

XI. Introduction of MAC : Overall Handover Procedures

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Scanning ProcedureWhen neighbor RAS are identified during scanning, the PSS shall attempt to synchronize with their downlink transmissions, and estimate the quality of the PHY channel.During scanning interval, PSS may try association with scanned neighbor RAS.The RAS may buffer incoming data during the scanning period, and transmit that data after the scanning period. After scanning, the PSS shall report the scanning result periodically or based on event-triggered.

Association ProcedureTo indicate successful scanning and ranging attempts for the purpose of HO Upon completion of a successful PSS initial-ranging of a RAS

When Service Level Prediction parameter = 2 in RNG-RSPthe PSS may mark the RAS as Associatedrecording elements of the RNG-RSPsetting an appropriate aging timer

While Association is valid (aging timer has not expired), PSS may use recorded Associated Ranging values to set Initial Ranging values in a new initial Ranging event to the same Associated RAS.

XI. Introduction of MAC : Scanning Operation

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Fr#(n+6) Fr#(n+7) Fr#(n+8) Fr#(n+9) Fr#(n+10) Fr#(n+11)Fr#(n) Fr#(n+1) Fr#(n+2) Fr#(n+3) Fr#(n+4) Fr#(n+5)

NBR-ADV

RAS#1

PSS

SCN-REQScan Duration

PSS PSS PSS

RAS#1

RAS#1

RAS#1

RAS#1

PSS

SCN-RSP Scan Duration

RAS#1

PSS

RAS#1

PSS

RAS#3

PSS

DL-SynchDL sync. & DL I nfomation

RAS#3

PSS

RNG-REQ*

RAS#3

PSS

RAS#3

PSS

REG-REQSCN-RSP

RAS#3

PSS

SCN-REQ REG-RSP REG-RSP

RNG-REQ/ RSPAssociation-initial-rangingDuring Scanning I nterval

Scanning I nterval

XI. Introduction of MAC : example of Scanning Procedure

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Fr#(n+6) Fr#(n+7) Fr#(n+8) Fr#(n+9) Fr#(n+10) Fr#(n+11)Fr#(n) Fr#(n+1) Fr#(n+2) Fr#(n+3) Fr#(n+4) Fr#(n+5)

RNG-RSP

HO-I NDRAS#1 communicates

through the backbone with RAS#2 and RAS#3

and decides which one to recommend the PSS to

transition to

RAS#1

PSS

HO-REQPossible target RAS: RAS#2: S/ N=15dB RAS#3: S/ N=17dBTime to HO: 7 Frames

PSS PSS PSS

RAS#1

RAS#1

RAS#1

RAS#1

PSS

HO-RSPRecommended target RAS: RAS#3: S/ N=17dBTime to HO: 3 Frames

RAS#1

PSS

RAS#1

PSS

RAS#3

PSS

DL-MAPFast UL Ranging I E = Assign Contentionless ranging opportunity

RAS#3

PSS

RNG-REQ

RAS#3

PSS

RAS#3

PSS

REG-REQ

REG-RSP

RAS#3

PSS

HO-RSP DL-MAP

XI. Introduction of MAC : example of Handover Procedure

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Sleeping mode is to minimize PSS’s energy usage as one of mobility supporting while staying connected to the network

Implementation of power-save mode is optional feature

Based on 4IPP Traffic modelAwake mode : exchanging PDUs in a normal fashion

Sleep mode : no exchanging PDUs and the PSS may power down

XI. Introduction of MAC : Sleep mode(1/2)

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Sleep window = Sleep-interval + Listening-intervalIncreasing Binary Exponentially until Maximum Sleep window

Sleep-interval A time duration, measured in whole frames where the PSS is in sleep-modePSS does not send or receive PDUs, and may power down one or more physical operation componentsPSS may awaken for periodic ranging

Listening-interval A time duration, measured in whole frames where the PSS is in Awake-modePSS shall synchronize with the Serving RAS downlink PSS shall listen for an appropriate MOB-TRF-IND message. The PSS shall decide whether to stay awake or go back to sleep based on the either value of its own 2-bit indicator in the SLPID bitmap orThe basic CID of the PSS in a MOB-TRF-IND from the Serving RAS.

XI. Introduction of MAC : Sleep mode(2/2)