November 2004 Gerald Chouinard, CRC Slide 1 doc.: IEEE 802.22-04-0003- 00-0000 Submiss ion Project: IEEE P802.22 Working Group for Wireless Project: IEEE P802.22 Working Group for Wireless Regional Area Networks (WRANs) Regional Area Networks (WRANs) Submission Title: WRAN System Concept Date Submitted: 17 November 2004 Source: Gerald Chouinard Company: Communications Research Centre of Canada Address: 3701 Carling Avenue, P.O. Box 11490, Station H, Ottawa, Ontario, K2H 8S2, Canada Voice: (613) 998-2500], FAX: ???, E- Mail:[email protected]Re: WRAN System Concept Abstract: Presents a system concept for WRANs for the group’s consideration Purpose: For information only. Notice: This document has been prepared to assist the IEEE P802.22 WG. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
19
Embed
Doc.: IEEE 802.22-04-0003-00-0000 Submission November 2004 Gerald Chouinard, CRCSlide 1 Project: IEEE P802.22 Working Group for Wireless Regional Area.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
November 2004
Gerald Chouinard, CRCSlide 1
doc.: IEEE 802.22-04-0003-00-0000
Submission
Project: IEEE P802.22 Working Group for Wireless Regional Area Networks Project: IEEE P802.22 Working Group for Wireless Regional Area Networks (WRANs)(WRANs)
Submission Title: WRAN System ConceptDate Submitted: 17 November 2004Source: Gerald Chouinard Company: Communications Research Centre of CanadaAddress: 3701 Carling Avenue, P.O. Box 11490, Station H, Ottawa, Ontario, K2H 8S2, CanadaVoice: (613) 998-2500], FAX: ???, E-Mail:[email protected]
Re: WRAN System Concept
Abstract: Presents a system concept for WRANs for the group’s consideration
Purpose: For information only.
Notice: This document has been prepared to assist the IEEE P802.22 WG. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.22.
November 2004
Gerald Chouinard, CRCSlide 2
doc.: IEEE 802.22-04-0003-00-0000
Submission
Wireless Regional Area Network (WRAN)
Initial System Concept
Gérald Chouinard
CRC
November 2004
Gerald Chouinard, CRCSlide 3
doc.: IEEE 802.22-04-0003-00-0000
Submission
Broadband Communication Infrastructure
November 2004
Gerald Chouinard, CRCSlide 4
doc.: IEEE 802.22-04-0003-00-0000
Submission
Rural Broadband: - Cable-modem / ADSL- WiFi hot-spots in ISM bands- Higher power, lower frequency broadband access system
40 km
30 km
20 km
MACLong excess delays
QPSK
16-QAM
64-QAM
PHYAdaptive
modulation
- Cable-modem / ADSL- WiFi hot-spots in ISM bands- Higher power, lower frequency broadband access system
40 km
30 km
20 km
MACLong excess delays
QPSK
16-QAM64-QAM
PHYAdaptive
modulation
November 2004
Gerald Chouinard, CRCSlide 5
doc.: IEEE 802.22-04-0003-00-0000
Submission
Household reach by technologies (“last mile”)
b
Population density (per km2)
Rel
ativ
e co
mp
lexi
ty/c
ost
(%
)
Su
bu
rba
n
Urb
an
De
ns
e u
rba
n
Ru
ral
Sp
ars
ely
po
pu
late
d
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100 1,000 10,000 100,000
100k
10k
1k
Optical fiber
Cable modem
ADSLMW wireless
Satellite
New wireless
PDF of total populationat specific density
100k
10k
1k
November 2004
Gerald Chouinard, CRCSlide 6
doc.: IEEE 802.22-04-0003-00-0000
Submission
Frequency of operation: Propagation considerations
0
10
20
30
40
50
60
70
80
90
100
.03 0.1 1 50.3 3Frequency (GHz)
Rel
ativ
e co
mp
lexi
ty/c
ost
(%)
Cosmicnoise
Industrialnoise
Ionosphericreflection
Rain fade
Foliageabsorption
%bandwidth
Dopplerspread
Outdoor/indoorattenuation
Groundwave reach
November 2004
Gerald Chouinard, CRCSlide 7
doc.: IEEE 802.22-04-0003-00-0000
Submission
Frequency of operation: User terminal and base station considerations
0
10
20
30
40
50
60
70
80
90
100
.03 0.1 1 50.3 3Frequency (GHz)
Rel
ativ
e co
mp
lex
ity
/co
st (
%)
NoiseFigure
Antennaaperture
Cable loss
RF circuitsize
Phasenoise
Filterselectivity
%bandwidth
November 2004
Gerald Chouinard, CRCSlide 8
doc.: IEEE 802.22-04-0003-00-0000
Submission
0
10
20
30
40
50
60
70
80
90
100
Frequency (GHz)
Re
lati
ve
co
mp
lex
ity
/co
st
(%)
.03 0.1 1 50.3 30.4 0.5 0.6 0.7 0.8 0.9
20.20.15
TVCh. 7-13
Ra
dio
nav
igati
on
Fix
ed
Fix
ed
Fix
ed
Fix
ed
se
c.
Fix
ed
se
c. Mo
bil
e
Mo
bil
e
Mo
bil
e
Mo
bil
e
Mo
bil
e
Mo
bil
e
Aero
Mo
bil
e
Fix
ed
se
c.
TVCh. 14-36
TVCh. 38-69
Me
teo
Fix
ed
Mo
bil
e
Optimum frequency rangefor large area Non-Line-of-sight Broadband Access
November 2004
Gerald Chouinard, CRCSlide 9
doc.: IEEE 802.22-04-0003-00-0000
Submission
IEEE Standards
November 2004
Gerald Chouinard, CRCSlide 10
doc.: IEEE 802.22-04-0003-00-0000
Submission
WRAN: Wireless Regional Area Network
• fits with the FCC definition of “Fixed/Access” category of operation given in the NPRM 04-186 on the use of TV band by license-exempt devices– aimed at bringing broadband access in rural and
remote areas– takes advantage of better propagation
characteristics at VHF and low-UHF– Takes advantage of unused TV channels that exist
in these sparsely populated areas
November 2004
Gerald Chouinard, CRCSlide 11
doc.: IEEE 802.22-04-0003-00-0000
Submission
WRAN System Concept
• Main constraint is to avoid interference to the incumbent services such as TV broadcasting (NTSC and DTV), and Public Safety systems in channels 14 to 20 in certain main markets
• Other constraints are the accommodation of some currently used license-exempt medical equipment and wireless microphones
• Use of etiquette is assumed for accommodation of as many operators as possible
November 2004
Gerald Chouinard, CRCSlide 12
doc.: IEEE 802.22-04-0003-00-0000
Submission
WRAN Base Stations
• Operation of WRAN is based on Fixed Wireless Access provided by professionally installed base stations that will control the RF characteristics of the user terminals
• The base stations will be:– Planned according to the available TV channels in
the area (channels for which the coverage area will be outside the Grade-B contours of existing and expected TV stations
– Operated by a legal entity with which incumbent systems could resolve potential interference problems
November 2004
Gerald Chouinard, CRCSlide 13
doc.: IEEE 802.22-04-0003-00-0000
Submission
WRAN User Terminal
• The user terminals:– Will be available as ‘commodity’ item from any
electronic stores– Will not need to be licensed nor registered– Will include interference sensing capabilities– Could be installed by simply connecting it to:
• A VHF and/or UHF antenna (log-periodic type for wide frequency range or Yagi for a narrow scanning range)
• a computer (through a Ethernet connector or through an integrated Wi-Fi connection)
• a power outlet.
November 2004
Gerald Chouinard, CRCSlide 14
doc.: IEEE 802.22-04-0003-00-0000
Submission
CPE Mock-up(RF based on low-cost UHF-TV tuners
RF Input
RF Output
Ethernet to computer
Power Supply
November 2004
Gerald Chouinard, CRCSlide 15
doc.: IEEE 802.22-04-0003-00-0000
Submission
WRAN User Terminal
• Terminal setup and initialization– A Web-based interface would be provided from
the terminal for interaction with the user– Upon indication from the user, the terminal would
initiate a scanning of all the TV channels to identify those channels that carry broadband network access in the area
– A list of such channels and the available service providers would be presented on the screen of the computer for selection by the user
November 2004
Gerald Chouinard, CRCSlide 16
doc.: IEEE 802.22-04-0003-00-0000
Submission
WRAN User Terminal• Terminal setup and initialization (cont’d)
– Access to the service could be initiated by: a telephone call to the operator to open an account and
tell the base station to contact the terminal by providing the terminal physical device number:– The base station would contact the specific terminal through
its physical device number and forward all the information to the terminal to establish a connection using the appropriate RF characteristics using network control packets
November 2004
Gerald Chouinard, CRCSlide 17
doc.: IEEE 802.22-04-0003-00-0000
Submission
WRAN User Terminal• Terminal setup and initialization (cont’d)
– Access to the service could be initiated by: directly by confirming access request to the selected
service provider on the Web-based interface of the terminal. (The terminal would acquire all the necessary parameters to establish a connection with the strongest base station of the selected service provider: transmission channel, transmit power, modulation parameters, access scheme and timing, etc.):
– Upon receiving an access request from the user terminal, the base station would indicate to the operator that a new account is needed and would allow temporary access to some functions to register the new user
– Full access would be granted once the transaction is complete
November 2004
Gerald Chouinard, CRCSlide 18
doc.: IEEE 802.22-04-0003-00-0000
Submission
WRAN User registration
• As part of the registration, the user will need to specify his personal coordinates, including its physical address for geolocation purposes
• The RF characteristics of the terminal will be under total control of the base station to alleviate any interference and control it at the network level.
• The base station will initiate sensing of TV and other RF signals at the user terminals, collect the information centrally and take action at the system level to avoid interference (e.g., change the frequency of a sector)
bit/(sec * Hz) (e.g., 64-QAM with ¾ code rate)• Full 6 MHz channel is expected to be used to provide
some 18 Mbit/sec shared forward capacity (1.5 Mbit/s to some 600 terminals assuming an over-subscription factor of 50:1)
• OFDM type modulation to counter increased multipath due to less directional antennas at VHF and low UHF (e.g., 1000 carriers to cover a range of 0.16 μsec to up to 33 μsec) (8000 carriers if on-channel repeaters are needed?)
• OFDMA on the return link to allow scaling of the user terminal transmit power to the transmitted data rate