workshop on the communication core technology educational culture center in seoul feb. 14, 2006

Core Technologies of the next generation wireless systems for the high rate mobile data access services

Workshop on the Communication Core TechnologyEducational Culture Center in Seoul

Feb. 14, 2006By - Bekay (Byung Keun) Lim, Ph.D.

ArrayComm LLC

PROPRIETARY AND CONFIDENTIAL 2

Agenda

1. Telecommunication Services Status and Trend2. Mobile Wireless Technology Evolution 3. Experience of the high rate AMC based technologies4. The constraints of public mobile wireless technology evolution5. AAS and SDMA for the high rate mobile access6. Experience of the AAS/SDMA technologies7. Conclusion


1. Telecommunication Services Status and Trend

• Telecommunication Services Status and Trend» Voice to Data & Multimedia» Wireline to Wireless» Higher Data Speed » Voice Centric network to Data Centric network» NGN, IPv6, Ubiquitous, 3.5G, 4G,» Core Service to Additional Supplementary Services,» Converged services» Converged market - Public Operator driven Market , Enterprise, and SOHO

Market.» Saturated and slow growth.» New Revenue Source are required for fast growth» Shared equipment to Personalized


» Voice to Data & Multimedia, Wireline to Wireless, Higher Speed

LAN/ WLAN

PSTN Voice

Dial up data

xDSL,

Cable modem

Data

Multimedia Services

Mobile Wireless VoiceVoice

Services

Fixed Fixed Wireless pedestrian VehicularMobility

InformationRate

64Kbps144Kbps

1Mbps

2Mbps Mobile Wireless

Broadband Multimedia

Services

Broadband Multimedia Services


» Voice Centric network to Data Centric network, NGN, IPv6, Ubiquitous, 3.5G, 4G,

Wireless 패킷망PSTN

Wireless PSTN

Access TransportAccess Transport

DATA

Switching NetworksSwitching Networks

Legacy Separate NetworkLegacy Separate Network

QoS Packet QoS Packet NetworkNetwork

MobileAccess

EnterpriseAccess

HomeAccess

SoftswitchSoftswitch

Next Generation NetworkNext Generation NetworkServices

services

Network


» Core Service to Additional Supplementary Services,• PSTN – IN services, 080, Ring Sound, CID, etc.• PCS, Cellular – SMS, Multimedia, Data

» Converged services, Converged market - Public Operator driven Market , Enterprise, and SOHO Market.• DMB over the Handset• Home Network

» Saturated and slow growth. New Revenue Source are required for further growth. Subscribers as of Dec.30, 2005• PSTN – No growth, (decrease) 22.92Mil• PCS, Cellular – 38.34Milion• High Speed Internet – 12.14Mil


» Shared telecommunication equipment to Personalized• PSTN provides a telecommunication services to every home and

Office (PSTN Phone) PCS, Cellular provide a personal services (Handset)

• Broadband Internet Access Services, xDSL, Cable, Metro Ethernet provide a High Speed Internet Access services to Home and Office (Desk Top PC)

Wireless Broadband Access provides a personalservices ( mobile PC)


2. Mobile Wireless Technology Evolution

•2. Mobile Wireless Technology Evolution » Voice Centric Network technology

• 3GPP2, IS-95A/B, cdma2000 1x/Ev-Do, 1xEV-Do rev A , • 3GPP, WCDMA, CDMA/HSDPA, HSUPA, LTE, TD-SCDMA, TD-

CDMA, • GSM, GPRS, EDGE,

» Data Centric network technology• IEEE802.x, Hiperxxx• WiFi, WiMAX, WiBro, Mobile WiMAX• HC-SDMA,


» From Voice Centric technology to Data Centric technology• Circuit switch Cellular/PCS to All IP Network

» Narrow Channel Bandwidth to Broad Channel Bandwidth• 1.25Mhz -> 5Mhz –> 10Mhz -> 20Mhz • To have a broadband access channel widen the channel

bandwidth» Uniform Rate service coverage to variable rate service coverage by

AMC• Symbol modulation for basic voice channel covers full service

areas• Higher order modulation 16QAM, 64QAM, 256QAM provides a

portion of coverage areas depend on the SNR• To achieve the high peak data rate as far as possible


3. Experience of the high rate AMC based technologies

• 3. Experience of the high rate AMC technologies» Easy approach to get a higher peak data rate » Non-uniform service coverage

25 20 15 10 5 0 dB

N

W E

S

SNR

Distance

2520151050-5


» Lower Cell Edge data rate deteriorate the service quality» Peak Data rate mislead the understanding for the End user even

Operators» Cause a complain by the poor service quality

< CDMA 2000 1x, WCDMA, GSM > < 1xEV-DO, EV-DV, HSDPA, WiBro>


4. The constraints of public mobile wireless technology evolution

• 4. The constraints of public mobile wireless technology evolution» Public wireless service system criterion

• Guarantee the quality of Services» Public Wireless Services system is different from private wireless system

• ISM band WIFI vs. Licensed Spectrum Radio System• Cell Planning and Quality

» HSDPA, Mobile WiMAX, WiBro, LTE, 3.5G, 4G, approach is to get a broadband channel bandwidth, higher rate AMC technique• Peak rate driven, OFDMA, MIMO, Higher Radio Frequency Band 2.5GHz,

5GHz, etc.• High RF band is required for Broadband Channel BW• Propagation loss, uniform service quality, Backhaul Cost limit the

massive deployment


» Lesson of Commercial experience of the MBWA system, Cellular, Netspot,• Expensive, Poor quality (non-uniform), Small coverage• Non-popular services

» Low cost , uniform service quality, higher data rate, higher network capacity are required.• For the popular services

» Voice Centric Approach could not break the paradigm of cost, quality constraint• User expect similar amount of payment for the data access• Data services requires several tenth times data capacity compare to

Voice services capacity » Data centric application network

• Can ensure the Capex and Opex for the MBWA services


» Data centric telecommunication MBWA network for what?• Providing services by a cheap cost• Providing guaranteed service quality• Providing uniform service quality• Providing commercial new subscriber (Mobile PC?)

Can not build a MBWA network by a legacy cellular concept» New Paradigm is required for MBWA network

• Limit some service features (mobility)• Smaller cell (Pico Cell for high capacity/m²)• Zone based service coverage ( reduce the Capex and Opex)• Higher Capacity / footprint ( MBWA requirement)• AAS for the Cell Edge Data Speed and Quality (Uniformity )


5. AAS and SDMA for the high rate mobile access

• 5. AAS and SDMA for the high rate mobile access» Array Antenna based Adaptive Antenna solution provides wider

coverage and higher capacity

Technical Interpretation• Gain vs. noise, fading, ... expands envelope to right• Interference mitigation (+ gain) expands it upwardsEconomic Interpretation• Coverage improvements reduce CapEx, OpEx (esp. backhaul, sites)• Capacity improvements reduce delivery cost, spectrum requirements

range (km)

Throughput/cell(Mbps)

2/2.5G (10 MHz)

802.11b (83 MHz)

Noise Limited

Interference Limited

Smart AntennaBenefit


• Exploiting Channel State Information

User 1,s1(t)ejt

+1-1

2bs2(t)

as1(t)+bs2(t) as1(t)-bs2(t)

User 2,s2(t)ejt

• Users’ signals arrive at array with different space-time channels• Processing provides gain and interference mitigation

+1+1

2as1(t)

as1(t) as1(t)


• Gain, Active & Passive Mitigation

user

omni/sectorreference

co-channel user

coherent gain

passive mitigation

active mitigation


• Protocol Independence» Applicable to any access & modulation methods» Processing in parallel on each channel resource

Transceiver

Channelizer(TDMA, FDMA, CDMA,

OFDMA)

Transceiver

Channelizer(TDMA, FDMA, CDMA,

OFDMA)

…

……

Spatial and Temporal Processing

baseband signals/user data

antenna antenna


• SISO, MISO, SIMO, MIMO, …

SISO» Single Input, Single

Output

MISO» Multiple Input, Single

OutputSIMO

» Single Input, Multiple Output

MIMO» Multiple Input, Multiple

OutputSDMA


• Wide variety of geometries and element types» arrangements of off-the-shelf single elements» custom arrays

• Array size» vertical extent determined by element gain/pattern as usual» horizontal extent, as small as 3-5 lambda» regular structures with 0.5 lambda subarrays desirable for FDD

• 2 GHz: array of eight 10 dBi elements is 0.5 x 0.75 m» small!» conformal arrays for aesthetics

•Antenna Arrays


RF PHY MAC

AntennaCo-Processing

Calibration Module

......

Resource scheduling and calibration control

Antenna processing software modules from ArrayCommCalibration subsystem

Common Radio System Logical Layouts for Advanced Antenna Processing

Base Station

Client Device

RF PHY MAC

Frame and Control

AntennaProcessing


» HC-SDMA system performance6.7x capacity improvement through 3 software releases in microcellular application, with over 275,000 installations in service in Japan and China

PHSHC-SDMA

Industry’s most sophisticated spatial processing at work in multiple large-scale deployments of true mobile broadband standard

GSM12–30 dB link budget and2–6x capacity improvement in challenging urban FDD application, large US operator trial ongoing


» WiBro/Mobile WiMAX performance -Downlink SINR distribution, reuse 3

Out of Service

~10dB

~30%


» WiBro/Mobile WiMAX performance - Downlink SINR distribution, reuse 1


• HC-SDMA , Base Case: 8 Terminals, 8 Carriers

600

700

800

900

1000

1100

0 10 20 30 40 50 60

Elasped Time [sec]

Thro

ughp

ut [

kbps

] Downlink

Uplink

220240260280300320340

0 10 20 30 40 50 60Elasped Time [sec]

Thro

ughp

ut [

kbps

]

2,629 7,966 Total

3281,025 UT#6

3281,027 UT#8

328982 UT#7

3321,026 UT#5

331892 UT#4

3251,027 UT#3

329964 UT#2

3281,023 UT#1

UplinkDownlink　

Average Data Rate [kbps]


• Antenna Configurations — Stub & Patch

» Pair 1: co-pol closely spaced

» Pair 2: x-pol

» Pair 3: co-pol distant


• Wavelength at 2GHz is about 15 cm• Typical handset dimension is 10 cm x 5 cm• A 2-antenna solution with 0.3 – 0.5λ antenna separation can be

easily accommodated• Due to the large angle spread of the received signals, a 0.3 –

0.5λ antenna separation will yield good performances• ArrayComm has studied handset antenna configurations in

detail


•Measurement Results – Patch Antennas


•Measurement Results – Stub Antennas


•Network Simulation – Ec/Ei in the WCDMA Handset

• 3GPP TR 29.942• 3 sectors/site• Max BS power: 20

Watts• Pilot TX power: 1

Watts• Cell radius: 1500 m• Uncorrelated

Shadowing sigma=8 dB


Ec/Ei After Cancelling Most Dominant Interferer






Ec/Ei After Cancelling Two Dominant Interferers






6. Experience of the AAS/SDMA technologies

• 6. Experience of the AAS/SDMA technologies» Mitigate the cell edge interference and provide uniform QoS» Increase the network average throughput » Increase the network total capacity by SDMA » Easy to implement on top of existing technologies» Optimum solution for data centric application system» MIMO Now

• BS AAS (Multiple RX/TX)• Handset AAS ( 2 Rx)


• 7. Conclusion» Next generation licensed MBWA market

• The last domain of telecommunication services» New ocean of Telecommunication services market

• When the subscriber come with a new client devices• New Device will consumes a lot of data traffic compare to

Cellular packet usage on the handset• Popularity will be assured by low cost and uniform quality

» Core technologies for the new public licensed MBWA market• AAS uniquely assures the uniform services quality• SDMA is the last technique to improve the capacity in any

technologies even on top of MIMO

7. Conclusion

workshop on the communication core technology educational culture center in seoul feb. 14, 2006

Documents