ITU-R SG 1/WP 1B WORKSHOP:
SPECTRUM MANAGEMENT ISSUES ON
THE USE OF WHITE SPACES BY
COGNITIVE RADIO SYSTEMS
(Geneva, 20 January 2014)
STUDIES ON CRS IN
THE RUSSIAN FEDERATION
Dmitry Tur
Ministry of telecom and mass
communications of the
Russian Federation
International
Telecommunication
Union
Implementation of Resolution ITU 58
in the TV broadcasting band
The Russian Federation just
after RA-12 started to realize
Resolution ITU 58 «Studies on
the implementation and use of
cognitive radio systems»
The UHF TV broadcasting band
was considered as the most
appropriate band for beginning
introduction of the CRSs
Frequency reuse distance in CRS
(kms or tens of km)
F7
F6
Underused channels
F7
F3
F1
F5
F2
F2
F4
F1, F2-F7
F1-F6
F6
F1
F1-F5,F7
F2-F7
F3
F1-F2,
F4-F7
F5
F4
F1-F4,
F6-F7
F1-F3,
F5-F7
Frequency reuse distance
in TV broadcasting network
(hundreds of km)
“Cognitive Radio System (CRS):
I s a radio system em ploying technology that allow s the system to obtain know ledge of its
operational and geographical environm ent, established policies and its internal state; to
dynam ically and autonom ously adjust its operational param eters and protocols according to its
obtained know ledge in order to achieve predefined objectives; and to learn from the results
obtained“
SG 1/WP 1B Workshop: Spectrum Management issues on to the use of White Spaces by CRS, 20 January 2014, Geneva
2
Assessment of available radio spectrum in
470-686 MHz
Maps of potentially available spectrum for CRSs in Khabarovsky region and its southern area
SG 1/WP 1B Workshop: Spectrum Management issues on to the use of White Spaces by CRS, 20 January 2014, Geneva
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Designation of the band 470-686 MHz for
CRS trial network in 2012/13
The SCRF Decision No 12-14-08 of 16 March 2012
designated the band 470-686 MHz for WBA CRS
trial network in the Russian Federation with all
interested legal entities and individuals involved,
provided radio systems of Russian origin are used
SG 1/WP 1B Workshop: Spectrum Management issues on to the use of White Spaces by CRS, 20 January 2014, Geneva
4
Measurement of protection ratio
CRSs & TV Broadcasting
Experimental equipment
Group of companies
SOZVEZDIE, OJSC
Research and
production company
MICRAN
Block-diagram of measuring installation
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SG 1/WP 1B Workshop: Spectrum Management issues on to the use of White Spaces by CRS, 20 January 2014, Geneva
Results of protection ratio measurements
CRS “Micran”
Analogue TV
DVB-T2
Results measurements of protection ratios (continued)
Signal power of “Micran” cognitive transmitting equipment at
the receiver input -60 dBm, 1.5 MHz channel bandwidth
*To convert into 8 MHz bandwidth, add 10log10(8 MHz/1.5
MHz)=7dB
Channel
Co-channel
Adjacent channel
Neighbour
1.5
(N+1)
channel (N+2)
MHz/8MHz
1.5 MHz/8MHz
1.5 MHz/8MHz
Protection
-3
-39
-57
ratio, dB
Channel capacity at the receiving side, kbit/s
Wanted signal level = -60 dBm
Co-channel
Adjacent N+1
Neigbouring N+2
Interference signal power, dBm
Channel capacity at the receiving side of “Micran”
CRS equipment
Signal power of DVB-T2 at the receiver input -50dBm
Modulati
on
Code rate
QPSK
QPSK
QPSK
QPSK
QPSK
QPSK
16-QAM
16-QAM
16-QAM
16-QAM
16-QAM
16-QAM
64-QAM
64-QAM
64-QAM
64-QAM
64-QAM
64-QAM
256-QAM
256-QAM
256-QAM
256-QAM
256-QAM
256-QAM
1/2
3/5
2/3
3/4
4/5
5/6
1/2
3/5
2/3
3/4
4/5
5/6
1/2
3/5
2/3
3/4
4/5
5/6
1/2
3/5
2/3
3/4
4/5
5/6
Protection ratio, dB
Co-channel
Adjacent
channel
4.4
-46.8
4.5
-46.6
4.6
-46.4
5.5
-46.2
6.1
-46.0
6.6
-49.5
7.4
-45.8
8.9
-45.5
10.5
-45.3
11.4
-45.0
12.2
-42.8
13.1
-40.5
11.8
-40.6
13.1
-39.5
14.8
-38.4
16.7
-36.9
17.5
-36.1
18.5
-35.3
16.7
-37.3
17.1
-35.5
19.6
-33.6
21.5
-31.0
22.6
-30.3
23.7
-29.5
Chann
el
N-19
N-18
N-17
N-16
N-15
N-14
N-13
N-12
N-11
N-10
N-9
N-8
N-7
N-6
N-5
N-4
N-3
N-2
N-1
N
N+1
N+2
N+3
N+4
N+5
N+6
N+7
N+8
N+9
Analogue signal power at the
receiver input
-39 dBm
-29 dBm
-19 dBm
-34
-33
-34
-34
-34
-34
-34
-34
-34
-34
-34
-34
-34
-34
-34
-34
-34
-34
-34
-34
-34
-34
-34
-34
-33
-33
-33
-33
-32
-32
-32
-32
-31
-31
-23
-28
-28
-22
-19
-19
-20
25
25
25
-24
-24
-24
-30
-30
-25
-33
-28
-22
-34
-31
-35
-32
-35
-32
-36
-33
-36
-33
-34
-31
-
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SG 1/WP 1B Workshop: Spectrum Management issues on to the use of White Spaces by CRS, 20 January 2014, Geneva
Field testing of CRS equipment
W ideband access (W BA)
system based on TDD w ith
different m odes, loads and
pow ers w ere at test for EM C
w ith BS receivers in co- and
adjacent channels
Frequency: 470-686 M Hz
EI R P: 23 dBm
The operating link betw een CR S
transm itting station at the m ast and
fix ed/ m obile CR S UEs at the surrounding
area established to evaluate the EM C
perform ance of the system
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SG 1/WP 1B Workshop: Spectrum Management issues on to the use of White Spaces by CRS, 20 January 2014, Geneva
Conclusions from
the laboratory and field trial
 Lim ited num ber of equipm ent w as ready for test, new tests are at schedule
 Database is needed as sensing only doesn’t provide necessary protection
of BS
 I t is necessary to provide separation distance betw een cognitive radio
transm it antennas and TV broadcast reception antennas in a range of 5 to
300 m
 I t is recom m ended to use CR S in BS bands for dow nlink only w ith
requirem ent for transm itting stations to be installed outside the
residential areas or at broadcast sites.
 CR S receiver overloading due to presence of signals from pow erful
broadcasting stations, including out-of-band em issions, m ay be a lim iting
factor
 Tunable filters for cognitive radio are needed to im prove EM C perform ance
in adjacent R F channels/ bands, that is relevant w hen bandw idth is m ore
than 7 M Hz in a standard R F channel w idth of 8 M Hz.
 EM C studies necessary for other radio services, ex cept broadcasting :
radionavigation, astronom y , m obile service, governm ent/ m ilitary
com m unications system s.
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SG 1/WP 1B Workshop: Spectrum Management issues on to the use of White Spaces by CRS, 20 January 2014, Geneva
Future actions for implementation of CRSs
Currently, the basic CRSs implementation is appeared to
be in the technological communication networks and
M2M, being partially applied even today. Further studies
are necessary to successfully implement the CRS
technologies in Russia
The SCRF Decision No 13-20-06 of 3 September 2013
recommended to continue the research and development
to determine the sharing applicability of cognitive radio
systems between different services, as well as changes
to the current frameworks
Inter-agency Working Party is planned to be
established (inter alia, with hardware
designers and academic circles involved) to
extensively study the engineering and
management issues of CRS implementation
in the Russian Federation
SG 1/WP 1B Workshop: Spectrum Management issues on to the use of White Spaces by CRS, 20 January 2014, Geneva
9
ITU-R SG 1/WP 1B WORKSHOP:
SPECTRUM MANAGEMENT ISSUES ON
THE USE OF WHITE SPACES BY
COGNITIVE RADIO SYSTEMS
(Geneva, 20 January 2014)
Thank you for your
attention!
International
Telecommunication
Union