[BMSB 2017] Preliminary Field Trial Results for DVB-T2 Indoor Reception in Seoul: A Single Transmitter Case

1. KoreanBroadcastingSystem| TechnicalResearchInstitute Preliminary Field Trial Results for DVB-T2 Indoor Reception in Seoul: A Single Transmitter Case IEEE BMSB 2017 Wednesday 6th June 13:30-15:10 TCongress @ Cagliari, Italy Session 2A: Broadcast System Field Test Sungho Jeon1, Junghyun Kim1, Yoo-Sang Shin1, Sanghoon Kim1, Sangjin Hahm1, Young-Woo Suh1, Sung-Ik Park2, Jae-young Lee2, and Jong-Soo Seo3 1Technical Research Institute, Korean Broadcasting System (KBS), Seoul, 07235, Republic of Korea 2Broadcasting Systems Research Department, ETRI, Daejeon, 34129, Republic of Korea 3Department of Electrical and Electronic Engineering, Yonsei University, Seoul, 03722, Republic of Korea
2. KoreanBroadcastingSystem| TechnicalResearchInstitute Table of Contents 1. Introduction 2. Transmit Configuration 2-1 Site Configuration 2-2 Transmission Modes 3. Receive Configuration 3-1 Measurement Equipment 3-2 Measurement Locations 4. Field Measurement Results 4-1 Horizontal Variation 4-2 Vertical Variation 4-3 Empirical Distributions of Signal Level and MER 4-4 Relationship between Input Level and MER 5. Conclusion 2
3. KoreanBroadcastingSystem| TechnicalResearchInstitute At 5:00 AM on 31 May 2017, KBS UHDTV Master Control Room Ceremony for World’s First Terrestrial UHDTV Broadcasting in Korea @ KINTEX
4. KoreanBroadcastingSystem| TechnicalResearchInstitute ATSC 3.0 RF Signal is On-Air over 700 MHz Band KBS1 52 EBS KBS2 5MHz 698 704 710 718 728 753 759 765 771 773 783 803 [MHz] 806 PS (Public Safety)- LTE PS (Public Safety)- LTE Guard band Guardband Guardband Guardband Mobile Broadband Uplink ↑ Mobile Broadband Downlink ↓ 748 2MHz 3MHz8MHz CH51 ATSC DTV 0 C V KBS1 MBC KBS2SBS EBS Namsan 5 kWMokdong 900 W Gwanak 5 kW Gwangyo 2 kW Yongmun 2 kW Seoul Metropolitan area 1st phase UHDTV transmission sites
5. KoreanBroadcastingSystem| TechnicalResearchInstitute Photo from an LG home appliance store nearby my house Antenna input for UHDTV (ATSC 3.0) Antenna input for DTV (ATSC 1.0)
6. KoreanBroadcastingSystem| TechnicalResearchInstitute 6 북감악 남산 계양산 관악산 광교 용문산 파평 하점 인천 송학 만월 광명 안산 운중 성남 송정 용인 이동 안성 화도 동두천 포천 가능 천보산 소흘 진접 불광 장위 백련 ATSC 1.0 DTV & DMB High Power Station 6 ATSC 1.0 DTV Only Low Power Station 13 ATSC 1.0 DTV & DMB Low Power Station 9 [Note] ATSC 1.0 DTV & DMB Transmission Site Status Operated by KBS in Seoul Metropolitan Area About 75 km from Kwan-Ak 28 in total
7. KoreanBroadcastingSystem| TechnicalResearchInstitute Motivation: Why & For What Are We Starting ATSC 3.0 based UHDTV Broadcasting? UHD TV 4K UHD HD Ultra High-Definition TV Improved Service with the Internet HD UHD 3,840 X 2,1601,920 X 1,080 4 times better image quality compared to HD HDR, WCG, HFR techniques for realistic broadcasting Fixed, portable, mobile reception in an SFN Direct reception environment anywhere IP-based interactive & customized service Home portal service with 2nd screen, disaster / safety information notice Fixed Indoor Reception Mobile Outdoor Reception UHD VoD Home Portal (Second screen, Customized service) Advanced Emergency Alerting ① Great benefit to viewers and ② to revitalize the broadcasting industry Viewer-friendly Reception Environment
8. KoreanBroadcastingSystem| TechnicalResearchInstitute [1] Brief Review on Previous Work 8 2014 IEEE Latin-America Conference on Communications (LATINCOM) the urban core of the city of Bilbao, in the north of Spain. Banderas IEEE Trans. Broadcasting, June 2015 The Sergio Arboleda University
9. KoreanBroadcastingSystem| TechnicalResearchInstitute [2] Collecting Basic Data on Terrestrial UHD Indoor Reception Performance 9 (a) Full Screen Notification before experiment Public notice on experiments for preventing a viewer’s inconvenience  Measurement period: April 26 ~ May 2, 2016 (5 Days) (b) Bottom Subtitle Scroll Announcement during the experiment
10. KoreanBroadcastingSystem| TechnicalResearchInstitute [2-1] Site Configuration: Kwan-Ak Site 10 DVB-T2 Transmitter DVB-T2 Professional Receiver RF Power Meter Spectrum Analyzer o (a) Outside Kwan-Ak Transmission Site (b) Inside Kwan-Ak Transmission Site
11. KoreanBroadcastingSystem| TechnicalResearchInstitute [2-1] Site Configuration for DVB-T2 Field Trials 11 o Table I: Transmitter Configurations of Kwan-Ak Mountain Table II: DVB-T2 System Parameters
12. KoreanBroadcastingSystem| TechnicalResearchInstitute [2-1] Site Configuration 12 (a) MPEG2-TS Multiplexer Setting (b) DVB-T2 Gateway Setting Bitrate (bps) 5,000,000 Bitrate (Mbps) 5.1
13. KoreanBroadcastingSystem| TechnicalResearchInstitute [3-1] Measurement Equipment (a) (b) DVB-T2 Demodulator 4K-UHD Software Decoder (a) Reception equipment, consisting of a dongle-type DVB-T2 demodulator with an antenna and a high-end smartphone. (b) Screenshot of the measurement software installed on the smartphone. Omni-directional Mono-pole Antenna
14. KoreanBroadcastingSystem| TechnicalResearchInstitute (a) Point 1 (b) Point 2 (a) 1-C 8-A 1-A 8-C 1 12 14 25 20 6 Kwan-Ak Transmitter (b) [3-2] Measurement Locations From Kwan-Ak transmitter From Kwan-Ak transmitter 5 kW The KBS Research Building The Yonsei Engineering Building
15. KoreanBroadcastingSystem| TechnicalResearchInstitute From Kwan-Ak transmitter From Kwan-Ak transmitter 1-A 1-B 1-C 1 2 3 5 6 2-A 2-B 2-C 3-A 3-B 3-C 4-A 4-B 4-C 5-A 5-B 5-C 6-A 6-B 6-C 7-A 7-B 7-C 8-A 8-B 8-C (a) Point 1: KBS Research Building Engineering Building #1 Engineering Building #2 Engineering Building #3 4 7 8 9 10 12 11 13 14 15 161718 19 25 24 22 21 20 23 (b) Point 2: Engineering Building at Yonsei University [3-2] Building Layout Indoor measurement locations inside the buildings mapped onto the floor plans
16. KoreanBroadcastingSystem| TechnicalResearchInstitute [3-2] Building Layout: Point 1 From Kwan-Ak transmitter A C
17. KoreanBroadcastingSystem| TechnicalResearchInstitute [3-2] Building Layout: Point 1 (2nd Floor) From Kwan-Ak transmitter 1-A 1-B 1-C 2-A 2-B 2-C 3-A 3-B 3-C 4-A 4-B 4-C 5-A 5-B 5-C 6-A 6-B 6-C 7-A 7-B 7-C 8-A 8-B 8-C
18. KoreanBroadcastingSystem| TechnicalResearchInstitute [3-2] Building Layout: Point 1 (Rooftop) From Kwan-Ak transmitter 1-A 1-B 1-C 2-A 2-B 2-C 3-A 3-B 3-C 4-A 4-B 4-C 5-A 5-B 5-C 6-A 6-B 6-C 7-A 7-B 7-C 8-A 8-B 8-C
19. KoreanBroadcastingSystem| TechnicalResearchInstitute From Kwan-Ak transmitter 1 2 3 5 6 Engine Buildi Engineering Building #2 Engineering Building #3 4 7 8 9 1718 19 25 24 22 21 20 23 [3-2] Building Layout: Point 2 6 1 2025 From Kwan-Ak transmitter Engineering Building #2 Engineering Building #3
20. KoreanBroadcastingSystem| TechnicalResearchInstitute ansmitter 5 6 Engineering Building #1 ering ng #2 ering g #3 7 8 9 10 12 11 13 14 15 161718 19 21 20 3 [3-2] Building Layout: Point 2 12 14 9 13 Engineering Building #1 From Kwan-Ak transmitter
21. KoreanBroadcastingSystem| TechnicalResearchInstitute From Kwan-Ak transmitter 1 2 3 5 6 Engineering Building #1 Engineering Building #2 Engineering Building #3 4 7 8 9 10 12 11 13 14 15 161718 19 25 24 22 21 20 23 1 12 14 25 22 [3-2] Building Layout: Point 2 (2nd Floor) 6
22. KoreanBroadcastingSystem| TechnicalResearchInstitute [4-1] Field Measurement Results: Horizontal Variation Horizontal variation for all floors at each indoor location before normalization: Point 1 (KBS Research Building) Point 2 (Yonsei Engineering Building) Level[dBm]MER[dB]
23. KoreanBroadcastingSystem| TechnicalResearchInstitute [4-1] Field Measurement Results: Horizontal Variation Horizontal variation for all floors at each indoor location after normalization: Point 1 (KBS Research Building) Point 2 (Yonsei Engineering Building) Level[dBm]MER[dB]
24. KoreanBroadcastingSystem| TechnicalResearchInstitute [Note] Field Measurement Results in Colombia: Horizontal Variation before normalization: after normalization: The normalized PDFs of the measurements in each floor to their respective mean value. : the difference from each floor is not very large. The PDFs of the measurements : the higher the mean value of the field strength [5] F. A. Contreras, E. Pedraza, D. Gomez-Barquero, “DVB-T2 Field Trials Results for Portable Indoor Reception in Colombia,” in 2014 IEEE Latin-America Conference on Communications (LATINCOM), Cartagena deIndias, Nov. 2014.
25. KoreanBroadcastingSystem| TechnicalResearchInstitute [4-2] Field Measurement Results: Vertical Variation Vertical variation for all floors at each indoor location: reference reference reference reference Point 1 (KBS Research Building) Point 2 (Yonsei Engineering Building) Level[dBm]MER[dB]
26. KoreanBroadcastingSystem| TechnicalResearchInstitute 26 [4-2] Field Measurement Results: Vertical Variation Table III: Average and Standard Deviations at Indoor Measurement Locations (a) Point 1: KBS Research Building (b) Point 2: Yonsei Engineering Building [EBU Tech 3348 r4 / Frequency & Network Planning Aspects of DVB-T2] In Bands IV/V, where the macro- scale standard deviations are 5.5 dB and 6 dB (§ A1.3.5), respectively, the combined value is 8.1 dB.
27. KoreanBroadcastingSystem| TechnicalResearchInstitute [Note] Field Measurement Results in Colombia: Vertical Variation The mean and standard deviation obtained for the measurements in the class rooms for all floors. -> It can be seen that the obtained values for the standard deviation are considerably similar to the values measured in this work. [5] F. A. Contreras, E. Pedraza, D. Gmez-Barquero, “DVB-T2 Field Trials Results for Portable Indoor Reception in Colombia,” in 2014 IEEE Latin-America Conference on Communications (LATINCOM), Cartagena deIndias, Nov. 2014.
28. KoreanBroadcastingSystem| TechnicalResearchInstitute CDF of the indoor measurements (solid-line), Curve-fitted CDF (dotted-line) Point 2 σ = 8.7044 Point 1 σ = 7.6905 (a) Signal Level [dBm] (b) MER [dB] Point 2 σ = 8.1041 Point 1 σ = 5.5979 [4-3] Field Measurement Results: Empirical Distributions of Signal Level and MER
29. KoreanBroadcastingSystem| TechnicalResearchInstitute -91.5 dBm 3 dB 20 dB -85.5 dBm 5 Mbps @ Point 1 5 Mbps @ Point 2 27 Mbps @ Point 1 27 Mbps @ Point 2 [4-4] Field Measurement Results: Relationship between Input Level and MER ▷ 5Mbps bad reception ▶ 5Mbps good reception ○ 27Mbps bad reception ● 27Mbps good reception . For good reception condition of threshold of visibility (ToV), (Level, MER)=(-85.5, 20.0) above in case of 27 Mbps, (Level, MER)=(-91.5, 3.0) above in case of 5 Mbps are required.
30. KoreanBroadcastingSystem| TechnicalResearchInstitute 30 [5] Conclusion  In this paper, the indoor measurements were collected from two buildings in Seoul, and link budget factors for planning DTT networks for indoor reception were derived.  Generally, increases in both the average reception level and MER were observed as the floor numbers increased. In addition, it was confirmed that the horizontal variation was similar regardless of the floor number. This indicated that the indoor reception quality was mainly affected by the indoor structure.  For future work, to improve the reliability of the analysis discussed above, another measurement campaign should be conducted to gather additional data, and extended to an SFN environment in which more than two transmitters are deployed.
31. KoreanBroadcastingSystem| TechnicalResearchInstitute [5-1] Further Study: Indoor Reception Performance in a 2-Transmitter SFN Kwan-Ak Transmitter (a) Point 1 (b) Point 2 Point 3 5 kW Kwan-Ak Transmitter 5 kW Nam-San Transmitter Korean Broadcasting Association (KBA) Building
32. KoreanBroadcastingSystem| TechnicalResearchInstitute [5-2] Building Layout & Measurement Equipment From Kwan-Ak transmitter From Nan-San transmitter Measurement point (worst reception environment) December 23, 2016 Spectrum Analyzer Omni- directional Antenna
33. KoreanBroadcastingSystem| TechnicalResearchInstitute -72.6-72.3-72.1 -78.4-79.3 -75 -70.6 -58.1 -63.4 -61.8 -65.4 -59.2 -54.5-53.7-55 -63.2-62.1 -59.1-59 -53.2 -51.6 -90 -80 -70 -60 -50 -40 -30 1층 2층 3층 4층 5층 6층 7층 8층 9층 10층 11층 12층 13층 14층 15층 16층 17층 18층 19층 20층 21층 Level [dBm] Strong Moderate Weak Veryweak [5-3] Field Measurement Results: Vertical Variation Korean Broadcasting Association (KBA) Building 21 2 December 23, 2016

Editor's Notes

Thank you, Mr. Chairman. Good Afternoon, everybody.

I’m Sungho Jeon, research engineer from Korean Broadcasting System, KBS.

The topic of this presentation is, the preliminary field trial results for
DVB-T2 indoor reception in Seoul.
First, we investigate the motivation
associated with why this experiment is needed
and why it was performed.

For understanding the results, we look at the transmit and receive configurations used for the experiment.

Then, We will analyze the results from various perspectives such as horizontal and vertical variation, empirical distribution,
and discuss the validity of the analysis results.
At 5 AM on May 31, 2017,
the world's first ATSC 3.0 standard-based terrestrial UHD broadcast was launched in Korea.
Each broadcaster transmitted the broadcast signal
through the UHD main control room,
and had a grand ceremony to celebrate it.
The world's first terrestrial UHD RF signal uses a 700 MHz frequency band,
which can be confirmed by a spectrum analyzer as shown in the figure.These signals are received from the multiple transmit sites,
Gwanak, Namsan, Gwangyo, and Yongmun,
which were constructed as a result of the 1st phase UHDTV transmission sites.
In other words, anywhere in the Seoul metropolitan area,
viewers having a UHDTV can watch terrestrial UHDTV contents
through the antenna.

It is because, in Korea, people willing to watch UHD program can buy ATSC3.0 UHDTV at the store nearby.
This is a photo taken from an LG home appliance store nearby my house.
Note that, KBS currently has 28 transmission stations in the Seoul metropolitan area.
That means, we will expand coverage through annual network expansion plan.
Why did we do indoor measurements?

Because introduction of ATSC 3.0 based UHDTV broadcasting aims to create a viewer-friendly broadcasting reception environment,

the goal is to increase the direct reception rate through indoor reception enhancement.

Therefore, the field test was performed to figure out the indoor reception condition
and to collect related basic data.
There are two major previous works related to DVB-T2 indoor reception.

One is measured in Colombia and
the other is measured in Banderas, Spain.
The measurement was carried out from April 26 to May 2, 2016.

In order to prevent the inconvenience of the viewers,
full screen notification was sent out
before the experiment,

and the bottom subtitle scroll announcement was performed
during the experiment.
For this measurement, only one transmission site in Kwan-Ak mountain was used.

Also, last year, we did not have an ATSC 3.0 transmitter yet,
so we used the DVB-T2 transmitter for the measurement.The slide shows the outside of the transmission station of Kwan-Ak mountain,
and the inside transmitter.
Two different DVB-T2 transmission modes were defined
to confirm different aspects of the indoor reception.

The first, 27 Mbps case was the capacity to provide high-quality content
and the second 5 Mbps case was the robustness of indoor reception.

The major parameters of each configuration are listed in this slide.
As shown in the slide, the related equipments,
MPEG2-TS Multiplexer, and DVB-T2 Gateway were set
according to the target transmission rate of 5 Mbps.
Measurements were performed with a portable DVB-T2 receiver
as shown in this slide.

As shown in the figure on the left, we used a receiver,,
connected to a DVB-T2 dongle and a Galaxy S6 smartphone for the experiment.

As shown in the right photograph, the dedicated software was developed
and installed in the Android phone
to measure the physical layer performance such as level and MER.
The measurement was carried out in two places,
one at KBS Building and the other at Yonsei Engineering Building.

The KBS building has a 5-story building
and the Yonsei building has a 7-story building.

Each is more than 10 km away from the transmission site.
For each floor, measurement points were distributed
as uniformly as possible inside building as described in the slides.
This slide details KBS research building.Point A is a building that crosses a large road,
so the radio waves are not particularly disturbed,

but at point C, there is a building of the same height and shape,
and point B is the center of the room.
In this slide, we have arranged the indoor environment as a photograph.There are windows at points A and C,Also, the windows of point A and point C are facing each other.
On this slide, we looked at the surrounding environment on the roof.From C-5 to C-7, the LoS environment can be obtained with Gwan-Ak Mountain.
This slide details Yonsei engineering building.In the case of 3rd engineering buildings,
it is possible to directly receive signals from Gwanak Mountain.

On the other hand, in case of the 2nd engineering building,
LoS condition cannot be ensured
because the signal is shadowed by the 3rd engineering building.
Interestingly. in the case of the first engineering building,
the field strength is generally lower than 2nd and 3rd engineering buildings

because the building is located in the same direction
as the signal arriving from Kwan-Ak transmission site.
In this slide, we have arranged the indoor environment as a photograph.There is windows. but one sided
First, a horizontal analysis of each floor was performed from the measured data.As shown in the slide, it is hard to find out the pattern from the raw data
because the average field strength of the floors differs from one floor to another,
This slide shows the result of the measured value normalized to the mean of each floor.As a result, it can be seen that the pattern of fluctuation of each floor is very similar.
A similar result is also confirmed in the Colombia measurement results.

Even though he average value of each floor is different,
after normalization to the mean value of each floor,
the PDF distribution of field strength shows quite similar results.
Second, vertical analysis was performed.

To do this, the measured values were normalized based on the 4th floor.
This is because the field test standard is based on the measurement with an antenna of 9 meter in height.On the average, as the number of floors increases,
the field strength or the MER value increase.
This table summarizes the mean and standard deviation values for the vertical analysis discussed in the previous graph.From the viewpoint of reception level,
the standard deviation for each floor is roughly
5 dB for Point 1 and 7 dB for Point 2.
It can be seen that the standard deviation of each floor is about 5 dB
even in the case of the Columbia measurement.

That is, the standard deviation are considerably similar
to the values obtained in this work.
From the calculated standard deviations,
we can draw the CDF and.
the results are in perfect agreement with the log-normal CDF.

This graph is considered to be a very important results in this paper
because it can predict the good service coverage of the targeted region

Once the mean and standard deviation is calculated by the measured data,,
we can determine the transmission rate
satisfying the corresponding the service coverage.
In determining the actual possibility of good reception,
it is necessary to consider the MER value as well as the reception level,
and this graph shows that there is a linear relationship between the two.

For instance, in case of 27 Mbps, minimum required ToV level is -85.5 dBm
and the ToV MER is 20 dB.
Here, we reached the conclusion.

In short, preliminary data were acquired and analyzed through two measurements.

Therefore, it is necessary to carry out more measurements,
Which leads to increase the reliability of the measurement results.
In addition, as a further study,
indoor reception in the SFN environment needs to be investigated.

For this purpose, a preliminary field test was conducted in December last year.
To figure out a rough trend,
one floor was measured for each floor,

and a worst point where no window existed was selected as the slide picture.
The preliminary graph is like this,
and the similar pattern can be seen in the SFN situation
that the field strength increases as the number of floors increases.

That’s all for my presentation.
Thank you for listening.

[BMSB 2017] Preliminary Field Trial Results for DVB-T2 Indoor Reception in Seoul: A Single Transmitter Case

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[BMSB 2017] Preliminary Field Trial Results for DVB-T2 Indoor Reception in Seoul: A Single Transmitter Case

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[BMSB 2017] Preliminary Field Trial Results for DVB-T2 Indoor Reception in Seoul: A Single Transmitter Case

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[BMSB 2017] Preliminary Field Trial Results for DVB-T2 Indoor Reception in Seoul: A Single Transmitter Case

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