Portable Internet ServicesPortable Internet Services€¦ · FFT Size (N FFT) 1024 # of used...

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Portable Internet ServicesPortable Internet Services

Chaehag (Steve) YiSOLiD Technologies, INCChaehag (Steve) YiSOLiD Technologies, INC

Portable Internet - DefinitionPortable Internet - DefinitionIt’s a High-Rate wireless internet access services that can be provided to any user, while moving as well as stationary, with aportable terminal anywhere, anytime.『 Portable Internet 』was named to 『WiBro』. (End of April, 2004)WiBro : Wireless Broadband

Low Cost

High Data Rate

Anytime,Anywhere

Mobility

Portable Internet - positioningPortable Internet - positioning

WLLFixed

High Mobility

Nomadic MobilityIMT2000

Mobility

2.4GHz Wireless LAN

User Data Rate

ADSL/HFC/B-WLL

The next Generation Multimedia Service

Cellular PCS(2G)

Portable Internet Market ForecastPortable Internet Market ForecastBackground− Demand on (Wire/Wireless) Internet services

in Korea has risen − An efficient frequency band was sought by

Industries; the government reallocated 2.3GHz, once allocated for FWA (WLL), for Portable Internet service (Dec. 2002)

− Why Portable Internet ? => Korean market wants Portable Internet service

Revenue (10M$ unit)

Subscriber (10K unit)

Portable Internet Market ForecastPortable Internet Market Forecast

Y+5 years from beginning : 8.9M

subscribers, 3 billion dollars revenue

Standardization by TTAStandardization by TTA

Major System Parameters

Duplexing TDD

Multiple Access OFDMA

10MHzChannel BW

Radio Access Requirement

Frequency ReuseFactor 1

Mobility 60 Km/h

1 KmService Coverage

max. DL / UL = 6 / 2aver. DL / UL = 2 / 1

Frequency Efficiency[bps/Hz/cell(sector)]

Between cells, sectors & Frequency : ≤ 150msHandoff

Throughput(per a User)

max. DL / UL = 3 / 1 [Mbps]min. DL / UL = 512 / 128 [Kbps]

Network Architecture of Portable InternetNetwork Architecture of Portable Internet

Public IP Network

OperatorIP Network

RASRASRAS

……

ACR : Access Control Router

RAS : Radio Access Station

PSS : Personal Subscriber Station

Schedule for Portable Internet ServiceSchedule for Portable Internet Service

20041st Half

20042nd Half

20051st Half

20052nd Half

TechnologyTechnical

Standard

(June, 2004)

Development of commercial

Service System

Trial Test

Service

Schedule

Selection ofservice carrier

(Dec, 2004)

Pre-commercial

service

Key component technologiesKey component technologies

Mobility Support with High Spectral Efficiency − Frequency reuse factor 1 operation

Sub-channel allocation method to minimize RAS interferencesCell edge – Low rate FECSafety Channel

− Fast AMC by CTC with QPSK/16/64 QAM based on channel quality reporting

− Battery life saving by sleep mode

Key component technologiesKey component technologiesGenuine Internet Access − Hybrid ARQ for high quality and low latency

Guarantee enhanced link performance− Various QoS support

Best effort/Real time polling/Non-real time polling− Enhanced handoff

Seamless connection for mobile user

DL Preamble

TTG RTG

Downlink Interval Uplink Interval

UL Control Symbol

Band 0

Safety Pattern

5 msec

BINTile

...SLOT SLOT

Frame StructureFrame Structure

Parameter Value

System Bandwidth 10 MHz

Sampling Frequency (Fs) 10 MHz

Sampling Interval (1/Fs) 100 nsec

FFT Size (NFFT) 1024

# of used sub-carriers 864

# of data sub-carriers 768

# of pilot sub-carriers 96

Sub-carrier spacing 9.765625KHz

Effective symbol duration (Tb=1/Δf) 102.4 μs

CP period (Tg= Tb/8) 12.8 μs

OFDMA symbol period (Ts= Tb+Tg) 115.2 μs

TDD frame length 5 ms

Parameters for OFDMA SignalParameters for OFDMA Signal

Technical Issues in Portable InternetTechnical Issues in Portable Internet

RAS vs. RepeaterTerminal TypeModem Implementation

RAS vs. Repeater

Capacity or Coverage

TDD Repeater Feasibility

RAS Architectures

Normal RAS + Pico RAS

Normal RAS + Repeater

Centralized RAS digital part with multiple RF parts

RAS vs. RepeaterRAS vs. Repeater

Centralized RAS ArchitectureCentralized RAS Architecture

Remoteβ

Remoteα

Remoteβ

RemoteβRemote

Remoteγ

Remoteα

Remoteα Remote

Remoteα

Legacy Data Terminals

Terminal – RequirementsTerminal – Requirements

Pros Cons

Note PC Abundant softwareGood multimedia environment

Difficult to use for mobile userLong time for ON/OFF

PDA-like PortabilityCheap price

Poor multimedia environmentNo Killer application

Mobile Phone Portability and Mobility Expensive Solution

Portable Internet Terminal

Portability and Mobility (like Mobile Phone)

Good Multimedia Environment (like Note PC)

Terminal – Component DevicesTerminal – Component Devices

Application Processor− Various Multimedia Codec,− 2D/3D Graphic Engine− Low Power Consumption

Communication Module− Multi-mode: Bluetooth, WLAN, Cellular

Display: High Resolution, Low Power ConsumptionStorageKeyboard

Terminal Modem Block Diagram - TxTerminal Modem Block Diagram - Tx

S /P &M a p p in g

C o m p a c t_ U L _ M A PM e s s a g e (N E P , N S C H )

IF F T

A d d C P&

In te rp o la tio nD A CR FP A

H -A R QA C K /N A C K

S o u rc e C T CE n c o d e r

H -A R QE n c o d e r

M o d u la tio n(Q P S K , 1 6 Q A M )

C T CB u ffe r

T im e /F re q .S y n c

L .OC lo c k

F ro m M S S R xC o m p a c t U L M A P P e r B it

P e r S y m b o l

P e r O F D M S y m b o l

C o n tro l S ig n a l

C Q I E n c o d in g

A C K /N A C KE n c o d in g

R a n g in g E n c o d in g

F ro m M S S R xID c e ll, s

F ro m M S S R x , C IN R

F ro m M S S R x , A C K /N A C K s

T o B S R x , R a n g in g

- F ro m M S S R x T im e a n d F re q u e n c y S y n c In fo rm a tio n- F ro m B S T x , R a n g in g [R N G _ R S P ]

F ro m M S S R xH -A R Q A C K /N A C K

B IT M A P

Terminal Modem Block Diagram - RxTerminal Modem Block Diagram - RxP e r B itP e r S y m b o l

P e r O F D M S y m b o l

C o n tro l S ig n a l

L N A R F A D C M ix e r D e c im a t io nR x

B u ffe r

P r e a m b leD e te c t

C o a r s eF r e q /T im e

S y n c .

T im eS y n c

F r e q .S y n c

R e m o v eC P

IF F T

D E M U X

F .B u f fe rC IN R M e a s u r eC e l l S e a r c h in g

K n o w n P r e a m b leP a t te r n

P r e a m b lea n d P ilo t

E x tr a c t&

C h a n n e lE s t im a t io n

E q u a liz e rC o m p a c t_ D L /U L _ M A PM e s s a g e D e c o d in g

D e m o d u la t io n(Q P S K , 1 6 Q A M ,

6 4 Q A M )S IN K

C T CD e c o d e r

H -A R QD e c o d e r

A C K /N A C K

C o m p a c t_ D L _ M A PM e s s a g e (N E P , N S C H )

T im eS y n c .

F r e q .S y n c .

C lo c k

T o M S S T x C IN R M e a s u r e

T o M S S T x ID c e ll , s S e a r c h in g

T o M S S T x C o m p a c t_ U L _ M A P

T o M S S T x R N G _ R S P

T o M S S T x A C K /N A C K M e s s a g e

D e m a p p in g&

T h e F ir s t 2 O F D MS y m b o l p e r F r a m e

M A P M e s s a g eO F D M S y m b o l

A l l F r a m e

D E M U X

T o M S S T x H -A R Q A C K /N A C K B IT M A P

How FPGA can helpHow FPGA can helpImplementation Issues

DSP vs. LogicTime to market

Portable Internet ServicesPortable Internet Services€¦ · FFT Size (N FFT) 1024 # of used...

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