CEPT
Doc. ECC/SE(12)072
ECC
Electronic Communications Committee
Working Group SE
62nd Meeting of WG SE
Wroclaw, Poland, 10 – 14 September 2012
Date issued:
4 September 2012
Source:
The Russian Federation
Subject:
ESTIMATION OF AVAILABLE SPECTRUM FOR COGNITIVE DEVICES
Password protection required? (Y/N)
N
Summary:
In this document, the estimation of potentially available frequency resource for cognitive devices
in Russian Federation is carried out. The estimation was carried out only for "white spaces" in
broadcasting service without using spectrum by other services, for instance ARNS.
Proposal:
To include this material in Annex 11 “Case studies on white space spectrum availability” of
Complementary Report to ECC Report 159 on further definition of technical and operational
requirements for the operation of white space devices in the band 470-790 MHz.
Background:
Contribution with initial estimation of available spectrum for cognitive devices in Russian
Federation was presented at the 13th meeting of SE43 in March 2012. At this meeting it was
decided not to include the contribution to the Complementary Report A1 because of disagreements
of the methodology. It was also decided to make the necessary corrections in the methodology to
be in compliance with the approaches considered in the Report 159 (ECC), and to present this
material for consideration for Public Discussion.
1. Introduction
The frequency band 470-790 MHz is widely used by the broadcasting service and is the main
frequency resource for the implementation and development of digital terrestrial broadcasting in the
Russian Federation.
The strategy of the transition to digital broadcasting provides simultaneous broadcasting in digital
and analog standards until the level of users equipment reaches the necessary amount. Using of the
analog broadcasting in the border area is carried out in accordance with Agreement Geneva-06,
according to which the end of the transitional period will be in 2015. Term of switching off analog
broadcasting in the inside areas can be selected based on specific situations.
The frequency band 470-790 MHz is also used in the Russian Federation by ARNS systems, cable
broadcasting systems and auxiliary systems of broadcasting (SAB/SAP).
The implementation of cognitive systems shall not restrict the development and future usage of the
incumbent services in the frequency band 470-790 MHz. Thus, perspectives for the development of
cognitive systems in the 470-790 MHz will depend on the presence of available frequency spectrum
and on the range of allowable technical parameters of the cognitive systems which provide
compatibility with incumbent services.
An assessment of the available frequency spectrum «white spaces» in the Russian Federation within
digital TV terrestrial broadcasting is provided below. Furthermore, it should be taken into account,
that in fact an amount of available spectrum for cognitive systems will be restricted by ARNS
systems, auxiliary systems of broadcasting (SAB/SAP), cable broadcasting systems and, in some
instances, by analog TV broadcasting stations.
Regulation of cognitive systems at the national level can differs from methods presented in ECC
Report 159 and in an additional Report depending on the goals to ensure the necessary level of
protection of existing services.
In this research, the estimation of available spectrum for cognitive device (or white space device,
WSD) was carried out considering the protection of fixed broadcasting reception (DTT) for the case
of Arkhangelsk region, the north-west region of Russian Federation. This scenario reflects
perspective after analogue broadcasting switch-off.
2. Methodology
The following assumptions were made regarding the methodology which was used to estimate free
spectrum:

Simultaneous use of 470-694 MHz by broadcasting service and white space devices was
considered.

Based on ECC Report 159 the 1% degradation of location probability of digital television was
chosen as a criterion of availability


As a cognitive device was considered LTE base station with antenna height 30 m
Worst case protection ratios were used based on ITU-R BT.1368-9 assuming LTE as
interferer (protection of 90% of silicon tuners and 0% payload option for WSD)
Propagation model. Analyzing the WSD location within DTT coverage area
the separation between WSD and TV receiver was considered as 80m, the interference
was calculated taking into account losses in free space and a standard deviation of
3.5dB. For long distances ITU-R P.1546 with standard deviation of 5.5dB was used.
The summation of interfering signals was not taken into account


WG SE – Wroclaw, Poland – 10-14 September 2012
2/6


Directivity discrimination of receiving antenna considered at each point
The 5 MHz bandwidth for WSD channel was considered and WSD channels were
allocated in such a way that centre frequencies of WSD channels coincided with centre
frequencies of TV channels (Figure 1).
Figure 1. TV and WSD channel grid
3. Estimation of available spectrum
The map of frequency spectrum availability for the north-west region of Russian Federation
(Arkhangelsk region) was carried out and presented in Figure 2. For this region it is typical uniform
relief and low density of television stations and settlements, especially in the northern part of the
region.
The summarized results of the estimation of available spectrum for cognitive device with different
powers are presented in Figures 3 and 4. Figure 3 presents the dependence of the number of free
channels for cognitive device on the percentage of the region territory for which this amount of free
channels is available. Figure 4 presents the dependence of the number of free channels for cognitive
devices on the percentage of population living in the region, for which this amount of free channels
is available.
WG SE – Wroclaw, Poland – 10-14 September 2012
3/6
Figure 2. Example of the map of frequency spectrum availability for cognitive device with power
20 dBm(100 mW) for Arkhangelsk region.
WG SE – Wroclaw, Poland – 10-14 September 2012
4/6
Percentage of whole region territory, %
100
90
80
70
60
50
40
30
20
10
0
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
White Space channels, depending on WSD e.i.r.p.
0 dBm
10 dBm
20 dBm
30 dBm
36 dBm
Figure 3. The results of analysis of available channels for cognitive device depending on the %
pixels, for which this amount of free channels is available.
Percentage of whole population of region, %
100
90
80
70
60
50
40
30
20
10
0
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
White Space channels, depending on WSD e.i.r.p.
0 dBm
10 dBm
20 dBm
30 dBm
36 dBm
Figure 4. The results of analysis of available channels for cognitive device depending on the % of
population of the region, for which this amount of free channels is available.
WG SE – Wroclaw, Poland – 10-14 September 2012
5/6
4. Conclusions.
There are wide variety of standards for cognitive radio systems, which allow different technical
parameters, are considering nowadays. For the estimation of potential interference from cognitive
device LTE standard was used as a standard which covers the widest range of mobile devices and
applications.
The estimation of available spectrum for implementation of cognitive devices was carried out in one
region of Russian Federation. Results of calculations show that with low power WSD ( e.i.r.p. 0
dBm) 20 channels are available for 90% of region population, but with high power WSD ( e.i.r.p.
36 dBm) 20 channels are available only for 20% of region population. And these settlements (which
constitute 20% of population) are situated near the sites of TV stations. However in this calculations
weren`t taken into account possible aggregate interference effects which could decrease available
spectrum for WSD. The “real situation” simulations and the installation of pilot zones are essential
to consider to the full the aggregation effects. At this rate there is a potential for implementation of
cognitive systems using geo-location databases.
WG SE – Wroclaw, Poland – 10-14 September 2012
6/6