12_3_NICT Japan 201210-I2R-WS2_r1

Copyright 2012 National Institute of Information and Communications Technology. All Rights Reserved

Prototype of 802.11af based White Space WiFi

Hiroshi Harada, Ph.DDirector, Smart Wireless Laboratory, NICTChair, IEEE Dyspan Standards Committee (IEEE 1900.x)Board, Wireless Innovation Forum and WhiteSpace AllianceEmail: [email protected]

Oct. 10, 2012

Current status of preparation for WS communication systems in JapanCurrent status of preparation for WS communication systems in Japan

Copyright 2012 National Institute of Information and Communications Technology. All Rights Reserved2

Topics Current Status StandardizationWSDB Co-existence guideline between TV services and one-seg broadcasting has been decided

Usage of WSDB is under consideration in the MIC. NICT has developed an original WSDB based on FCC, OFCOM, and MIC The developed WSDB by NICT was licensed to a company (ISB corporation) The company demonstrated the WSDB at Super Wi-Fi Summit (FCC based one) on Oct.

2012 and the DB will be opened to users as trial one

MICWhite space

alliance

Coexistence Coexistence mechanism between secondary users was proposed to 802.19.1 and it is now in the latest draft document

802.19.1 draft compliant WS coexistence DB was developed by NICT and its feasibility studies are on-going

802.19.1

RAN IEEE802.22 based radio equipment has been developed by several Japanese companies and NICT (will be released early 2013.)

The specification is discussed in White Space Alliance as WAVE 1. Enhancements for Broadband Services and Monitoring Applications based on 802.22 has been

started. NICT provides chairperson for the project

802.22/22b

LAN IEEE802.11af based white space LAN prototype was developed by NICT Coexistence DB between 802.11af based systems was developed by NICT Feasibility study will be finished by early 2013

802.11af

PAN/Sensor NW

IEEE 802.15.4g based and Japanese original WS personal area network was proposed in 802.15.4m

NICT provides vice-chairperson and technical editor for the project The proposals is now in the latest draft document IEEE 802.15.4m based WS sensor NW is developing

802.15.4m

NICT developed WS prototype802.11af based systemNICT developed WS prototype802.11af based system


items value

Frequency 470-770MHz (TVWS) / 2.4GHz

Bandwidth5/10/20MHz(2.4 GHz)6 MHz (TVWS)

Transmission rate Maximum 54 Mbps

Transmissionpower and mask

20dBm, meet FCC regulation

ModulationOFDM (48 carriers for data,, 4 carriers for pilot)OFDM (802.11af compliant, non HT duplicatemode

Subcarriermodulation

BPSK/QPSK/16QAM/64QAM (2.4 GHz)BPSK (TVWS)

MAC IEEE 802.11 compliant

Antenna gain UHF band: 0dBi 2.4GHz band:2dBi

Internet Router

1 SegTVtransmitter

1seg transmitter registered in the database (RLSS)

1seg transmitter NOT registered in the database (RLSS)

11af AP #

Three times higher throughput was achieved if APs are registered in the database (RLSS)

Prototype setupPrototype setup


TVWS Database, RLSS, AP and Stations are implemented TVWS Database

Protection rules of primary users of FCC Primary user only digital TV transmitter IETF PAWS based on HTTP implemented for talking to

database RLSS

802.11af draft D1.05 implemented RLQP implemented for talking to RLSS

AP and STAs MAC: 802.11af D1.05 implemented PHY: 802.11a re-band to Japanese digital TV bands

FCC WSDB

11af STA #

11af STA #

Internet

1 SegTV transmitter

Router

Demonstration Scenario #1 Demonstration Scenario #1


CH 54 55 56 57 58 59 60 61 62

11af20MHz

FCC WSDB

FCC WSDB

11af STA #

11af STA #

segbroadcasting

Channel situation

11af

1 seg

CH 54 55 56 57 58 59 60 61 62

Channel situation

11af1 seg

Before using RLSS

After using RLSS


11af #320MHz

11af #120MHz

11af #120MHz

FCC WSDB

11af STA #

11af #25MHz

CH 54 55 56 57 58 59 60 61 62

Channel situation

11af #310MHz

11af STA #

11af AP #

5MHz

20MHz

FCC WSDB

11af STA #

11af STA #

seg

10MHz

CH 54 55 56 57 58 59 60 61 62

Channel situation

11af #220MHz

1seg TV transmitter

Before using RLSS

After using RLSS

Demonstration Scenario #2 Demonstration Scenario #2

Database Access DelayDatabase Access Delay


WSDB

AP #1

Query Request

AP #2

Query Response

WSDB

AP #1

AP #2

RLSS

RLQP-CAQ/CSM/NCC Request

RLQP-CAQ/CSM/NCC Response

First AP Query timeRequest time stamp 1275.68440036

Response time stamp 1275.921320024 WSDB access time 237 ms

Second AP Query timeRequest time stamp 1994.710346232

Response time stamp 1994.961237445 WSDB access time 251 ms

First AP CAQ time CSM time NCC timeRequest time stamp 5278.008337173 5278.295025518 5278.273547428

Response time stamp 5278.273092987 5279.552251872 5278.294752149 WSDB access time 265 1257 21 Ms

Second AP CAQ time CSM time NCC timeRequest time stamp 5283.590365567 5283.976146346 5283.954498924

Response time stamp 5283.954002189 5284.232544091 5283.975946712 WSDB access time 364 256 21 ms

ThroughputThroughput


Under Scenario #1 Frequency: 731MHz TX power of 802.11AP and STA:2dBm TX power of 1seg transmitter:-40dBm Throughput of 802.11 (measured by Iperf): 10.7Mbps (20MHz)

1seg transmitter registered in the database 1seg transmitter NOT registered in the database

Throughput (cont)Throughput (cont)


Under Scenario #2 NCC(Network Channel Control) is implemented to distribute BSSs

(Basic Service Set) to different channels and avoid 1seg transmitter Frequency: 726-760MHz TX power of 802.11AP and STA:2dBm Throughput of 802.11 (measured by Iperf)

Without RLSS: 2.98Mbps (20MHz)

With RLSS: 10.7Mbps (20MHz)

Documents

12_3_NICT Japan 201210-I2R-WS2_r1