ESTUDO SOBRE A INTERFERÊNCIA ENTRE ISDB-T E IMT NA BANDA DE 700 MHZ

Transcription

1 ESTUDO SOBRE A INTERFERÊNCIA ENTRE ISDB-T E IMT NA BANDA DE 700 MHZ May 28, 2013 Tatsuhiro HISATSUNE MINISTÉRIO DE ASSUNTOS INTERNOS E COMUNICAÇÕES JAPÃO

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4 VHF ANT Not in Use today

5 UHF ANT in Use

6 This ANT can receive digital TV signal between MHz band.

7 This ANT can receive 700MHz band analog TV signal.

8 Base Station for Mobile Downlink

9 Base Station for Mobile 700 MHz Downlink This ANT can receive 700MHz band IMT signal.

10 Harmful Interference occurs or not? What is possible countermeasure? How can it be avoided? How much cost is it? Who will pay or it?

11 Background #1 Frequency Table in Japan

12 Securing New Mobile Phone Frequencies Through Reallocation of 700/900MHz In order to secure maximum mobile phone frequencies in 700/900MHz bands in keeping with the frequency assignment of foreign countries, the frequencies of the existing systems such as MCA and RFID, will be migrated to the other frequencies and be assigned to mobile phone service. 1-3ch 4-12ch 13-52ch 53-62ch Analogue TV Analogue TV Before the reallocation After the reallocation Analogue TV Digital TV Digital TV Digital TV 710 Frequencies freed up through reorganization (repacking) of digital terrestrial televison broadcasts Radio microphones Mobile (handsets) Mobile (handsets) Analogue TV Digital TV ITS (1) FPU / (2) Radio microphones Mobile (base stations) Mobile (base stations) Wireless microphones Wireless microphones Mobile use (handsets) Reallocation Mobile (handsets) Asia and Pacific Region assignment <frequency separation : 55MHz> MCA (base stations) MCA (base stations) Mobile use (base stations) Mobile (base stations) Personal wireless (3) Vacant frequencies MCA through reorganization of (handsets) mobile phone frequencies Mobile (handsets) Mobile (handsets) Migration migrated to the Whitespace/1.2GHz band KDDI group NTT docomo e- access KDDI group NTT e- docomo access migrated to the 1.2GHz/2.3GHz bands Softbank mobile RFID MCA (handsets) (4) RFID STL (MHz) 960 Mobile (base stations) (MHz) 960 Softbank mobile Mobile (base stations) 960 European assignment <frequency separation : 45MHz> Outline of systems eligible for migration (as of end of Jan 2012) System name System outline Major users (Licensee numbers) 700MHz band Portable-type radio system used by broadcast operators for relay (1) FPU broadcasts of news and sports programs (2) Specified Radio Wireless microphone systems for high quality voice and sound transmission microphones 900MHz band Trunked radio systems which have broadcast (simultaneous directives) (3) MCA *1 functions or group communication functions, used for transportation services, disaster administrative radio communication, etc. (4) RFID *1 Systems that conduct exchanges of individual identification information through short-range wireless communications. Used for distribution services,etc. *1 as of end of July 2011 *2 Including stations not requiring licenses (passive-type as of the end of March 2011, active -type as of the end of June 2011) The 700MHz band assigned to eaccess Ltd., NTT DoCoMo, KDDI group effective June 28, 2012 wireless station numbers Broadcast operators (43) 102 Broadcast operators, Theatres, etc. (992) 21,176 Transportation companies, Local governments, etc. (12,426) Distribution companies, Manufacturers etc. (685) 242,066 87,672 *2

13 90~108MHz (1~3ch) 170~222MHz (4~12ch) 470~770MHz (13~62ch) Analog TV broadcasting Analog TV broadcasting Analog & digital TV broadcasting -New directions in broadcasting (multimedia broadcasting) -Application for disaster control, etc. (1~12ch) MHz bandwidth New service 17 0 In and after 2011 Allocation for TV broadcasting a total bandwidth of 240 MHz MHz bandwidth Digital TV broadcasting (13~52ch) MHzbandwidth New service -Improvement of mobile phone service -Development of a society with safer road transport (ITS) (53~62ch)

14 Digital TV Mobile (handsets) Mobile (base stations) Radio microphones ITS Wireless microphones Mobile (handsets)

15 Result of AWG(=APT wireless group) (= ITU-R M ) Harmonization of MHz mobile use in APT region As of September 2010

16 In June 2007, MIC decided that end of digital terrestrial service should be 710MHz. Before that MHz band(ch 53, 54) was allocated for DTTV.

17 Background #2 New policy scheme for Reallocation

18 History of introduction of IMT in 700MHz band July 2001 December 1, 2003 April 1, 2006 December 1, 2006 July 24, 2011 End of 2009 Through amendment to the Radio Law, the date of the termination of analog and full transition to digital broadcasting was determined to be July 24, 20 Digital terrestrial broadcasting was launched in the three largest metropolitan areas One-segment broadcasting service began Digital terrestrial broadcasting expanded to nationwide Complete termination of analog broadcasting Start of official consideration of IMT introduction in 700MHz band

19 History of introduction of IMT in 700MHz band December 18, 2009 May 14, 2010 September, 2010 December 14, 2010 June 1, 2011 August 2, 2011 September 6, 2011 MIC technical Council (Information and Communications Council) started deliberations concerning technical conditions for mobile communications systems using the 700/900MHz Band Study Group on wireless broadband was established in the Council AWG Report Study Group made a report to the MIC Minister Point 1: New policy should be established in order to accelerate the introduction of IMT service Point 2: MIC should consider of the introduction for auction New policy was established through amendment to the Radio Law Survey of potential market entrants in 700/900 MHz band mobile communications system Official announcement of result from survey of potential market entrants in 700/900 MHz band mobile communications system September 14, 2011 Official announcement of Frequency Reorganization Action Plan (September 2011 revised edition)

20 History of introduction of IMT in 700MHz band December 27, 2011 February 17, 2012 February 29, 2012 February 29, 2012 April 11, 2012 April 11, 2012 Appeal for opinions on draft report from MIC technical Council for foster mobile phones Technical Requirements for mobile communications systems using 700MHz bands Appeal for opinions on Ministerial Ordinance and Bulletin Plans relating to Technical Requirements for mobile communications systems using 700MHz band Appeal for opinions on draft guidelines for establishment of special base stations using 700MHz band Results of appeal for opinions on draft guidelines for establishment of special base stations using 700MHz band and Appeal for opinions on Ministerial Ordinance and Bulletin Plans relating to Technical Requirements for mobile communications systems using 700MHz band Report from the MIC regulatory Council(Radio Regulatory Council)

21 History of introduction of IMT in 700MHz band April 17, 2012 June 27, 2012 December 3, 2012 May November 1,2014 January xx,2014 Receipt of applications for authorization of establishment plans for specified base stations for diffusion of 3.9G mobile communications system Approval of establishment plans for specified base stations for diffusion of 3.9G mobile communications system Establishment of new organization Association of 700MHz Frequency Promotion Today Two out of three mobile operators will start the operation of LTE base stations in 700MHz band Two out of three mobile operators will start LTE service in 700MHz band

22 Abstract of 3 mobile operator s LTE plan in 700MHz Band

23 Background #3 New policy scheme for Reallocation

24 History of introduction of IMT in 700MHz band December 18, 2009 May 14, 2010 September, 2010 December 14, 2010 June 1, 2011 August 2, 2011 September 6, 2011 MIC technical Council (Information and Communications Council) started deliberations concerning technical conditions for mobile communications systems using the 700/900MHz Band Study Group on wireless broadband was established in the Council AWG Report Study Group made a report to the MIC Minister Point 1: New policy should be established in order to accelerate the introduction of IMT service Point 2: MIC should consider of the introduction for auction New policy was established through amendment to the Radio Law Survey of potential market entrants in 700/900 MHz band mobile communications system Official announcement of result from survey of potential market entrants in 700/900 MHz band mobile communications system September 14, 2011 Official announcement of Frequency Reorganization Action Plan (September 2011 revised edition)

25 Quick and Smooth Spectrum Reallocation by the New Scheme Previous Process Existing Radio Stations The mobile phone operator readies base stations for operation after all existing radio stations are migrated. All Migrated Migrated Since all costs are paid by the existing radio station licensee, the project will require about 10 years. Mobile phone Operator Establishment of Base Stations Introduced a system (termination acceleration measures) to promote reallocation of radio frequencies, where the cost required for the frequency migration is borne by those to whom radio frequencies are newly allocated (Partial revision of the Radio Act (establishment 5/26/2011, promulgation 6/1, effective date 8/31)) New Scheme Existing Radio Stations The mobile phone operators prepare the base station as migrating existing radio stations in order and commence service sequentially. Migrate in order Migrated As mobile phone operators bear the cost of migration, the migration implementation time is shortened. Migrated Migrated Establishment of Base Stations Service provided Establishment of Base Stations Service provided Establishment of Base Stations Mobile phone Operator Mobile phone Operator Mobile phone Operator

26 Establishment of systems in order to plan quick reorganization of frequencies (partial revision of Radio Act) Revision Establishment Outlines of systems in order to plan quick reorganization of frequencies (partial revision of the Radio Law) In order for operators trying to newly establish specified base stations (mobile phone base stations) to start their operations early through having them bear the costs necessary to change the frequencies of existing wireless stations, establishment guideline regulation items and establishment plan recorded items have been added to items relating to the burden of those costs. (to be effective from May 26, 2011, announced on June 1, and enacted on August 31) (*) The establishment plan approval system is a system that approves specified base station licence applications only from operators that have had their estabishment plan approved. Revision Content Additional establishment guidline regulation items Frequency usage term of existing systems Items relating to operators trying to establish specified base stations bearing the costs needed to terminate use of frequencies by existing wireless stations before the end of the usage term and other measures (termination acceleration measures) Additional establishment plan recorded items Content of termination accelleration measures Payment method of fees necessary for termination acceleration measures Extend the term of validity of establishment plan approval from 5 years to 10 years Present information relating to wireless stations targeted for termination acceleration measures Existing licensee etc (4) (5) Frequency changeover procedures etc. Execution of termination acceleration measures(bearing of costs required for frequency changeover etc.) Government (3) (1) Enactment of establishment guidelines (*) Items relating to termination acceleration measures (2) Provision of establishment plans (*) Recording of termination acceleration measures content, payment method Operator B is selected of based fees on amount of costs that can be covered (Establishment plan approval) Provision of information involving items relating to existing wireless station Establishment aspirant A (Mobile phone operator) Establishment aspirant B (Mobile phone operator)

27 History of introduction of IMT in 700MHz band April 17, 2012 June 27, 2012 December 3, 2012 December 24, 2012 May November 1,2014 January xx,2014 Receipt of applications for authorization of establishment plans for specified base stations for diffusion of 3.9G mobile communications system Approval of establishment plans for specified base stations for diffusion of 3.9G mobile communications system Establishment of new organization Association of 700MHz Frequency Promotion Change in political administration Denial of the introduction of auction Today Two out of three mobile operators will start the operation of LTE base stations in 700MHz band Two out of three mobile operators will start LTE service in 700MHz band

28 Today s Main Theme #1

29 History of introduction of IMT in 700MHz band December 27, 2011 February 17, 2012 February 29, 2012 February 29, 2012 April 11, 2012 April 11, 2012 Appeal for opinions on draft report from MIC technical Council for foster mobile phones Technical Requirements for mobile communications systems using 700MHz bands Appeal for opinions on Ministerial Ordinance and Bulletin Plans relating to Technical Requirements for mobile communications systems using 700MHz band Appeal for opinions on draft guidelines for establishment of special base stations using 700MHz band Results of appeal for opinions on draft guidelines for establishment of special base stations using 700MHz band and Appeal for opinions on Ministerial Ordinance and Bulletin Plans relating to Technical Requirements for mobile communications systems using 700MHz band Report from the MIC regulatory Council(Radio Regulatory Council)

30 Technical Requirements for Mobile Communications System using 700 MHz Bands One February 17, 2012, the Ministry of Internal Affairs and Communications (MIC) received a partial reply from the Information and Communications Council concerning technical requirements for mobile communications systems using 700MHz bands

31 Technical Requirements for Mobile Communications System using 700 MHz Bands A part of the council report was submitted to SG6 of ITU-R, which will be held from April 15 to April 26, as the attachment to Report ITU-R BT.2247 Field measurement and Analysis of Compatibility between DDTB and IMT

32 Table of Contents Report ITU-R BT.2247 Study on interference between ISDB-T and IMT in the 700 MHz band 1. Introduction 2. Technical parameters of mobile communication system in the 700MHz band 3. Technical analysis of interference between ISDB-T and IMT in the700mhz band 4. Summary of consideration results for interference between ISDB-T and IMT in the 700MHz

33 Table of the 3 Technical analysis of interference between ISDB-T and IMT in the700mhz band 3.1 Combined study on interference 3.2 Interference from DTTB to IMT 3.3 Interference from IMT downlink into DTTB 3.4 Interference from IMT uplink into DTTB

34 Table of the 3 Technical analysis of interference between ISDB-T and IMT in the700mhz band 3.3 Interference from IMT downlink into DTTB Study on guardband of 0MHz Study on guardband of 60MHz

35 Study on out-of-band interference from IMT downlink to DTTB #1 Study on guardband of 60MHz Condition: receiver with booster

36 Main Points (P (1)) study on out-of-band interference from IMT downlink to DTTB Study on guardband of 60MHz (1) Additional study on out-of-band interference from IMT downlink to DTTB A) Additional study on out-of-band interference from IMT downlink to DTTB receiver With regard to the models [1] to [6] and [9] to [12], an experiment is performed to verify the effects of out-of-band interference on DTTB receivers.

37 Fig Experiment results by model

38 Main Points (3.3.2 (1)) study on out-of-band interference from IMT downlink to DTTB In the experiment, 25 models of DTTB receivers are used. The desired DTTB signal (signal level: - 77 dbm to -40 dbm/6 MHz) and the worst signal generated by a signal generator (SG) as the IMT downlink signal (15 MHz 2 [773 MHz to 803 MHz]) are input to those receivers to check the IMT downlink input level when the effects of interference are detected to obtain the desired signal to undesired signal ratio (D/U ratio) for the DTTB signal input level.

39 TV receivers DTTB signal 25 models signal level: -77 dbm to -40 dbm/6 M IMT signal 15 MHz 2 [773 MHz to 803 MHz]

40 Main Points (3.3.2 (1)) study on out-of-band interference from IMT downlink to DTTB 49 ch, which is assumed to be affected greater than 52 ch, was determined as the DTTB channel for measurement in consideration of the effects of image interference. Detailed measurements are performed for all 25 models. The presence or absence of the effects of interference is visually checked for 20 seconds.

41 Main Points (3.3.2 (1)) study on out-of-band interference from IMT downlink to DTTB Fig shows measurement results by model in 49 ch and Table shows the results of the model that indicated the worst characteristics by DTTB signal input level.

42 Fig Experiment results by model

43 Table Experimental results of out-of band interference DTTB CH 49 (a) DTTB signal input level [dbm/6 MHz] (b) Attenuation worst value [db] (Ref.) Attenuation median value [db] (c) IMT downlink signal input level to DTTB (0 dbm - (b)) [dbm]* D/U ratio [db] ((a) - (c))

44 Main Points (3.3.2 (1)) study on out-of-band interference from IMT downlink to DTTB It is found that the worst value of the D/U ratio is - 35 db when the DTTB signal input level is -40 dbm/6 MHz. It is also found that there is a difference of 5 db between the worst value and median value of the 25 models for the IMT downlink level with the effects of interference detected.

45 Main Points (3.3.2 (1)) study on out-of-band interference from IMT downlink to DTTB It is found that the worst value of the D/U ratio is - 35 db when the DTTB signal input level is -40 dbm/6 MHz. It is also found that there is a difference of 5 db between the worst value and median value of the 25 models for the IMT downlink level with the effects of interference detected.

46 Fig Worst case Experiment results by model

47 Table Experimental results of out-of band interference DTTB CH 49 (a) DTTB signal input level [dbm/6 MHz] (b) Attenuation worst value [db] (Ref.) Attenuation median value [db] (c) IMT downlink signal input level to DTTB (0 dbm - (b)) [dbm]* D/U ratio [db] ((a) - (c))

48 35 db -40 dbm -5 dbm 49ch

49 Reference #1

50 Reference #2

51

52 Reference #3

53 Study on out-of-band interference from IMT downlink to DTTB #2 Study on guardband of 60MHz Condition: receiver with booster

54 Main Points (3.3.2 (1)) study on out-of-band interference from IMT downlink to DTTB B) Additional study on out-of-band interference from IMT downlink to LNA(low noise amplifier for TV) With regard to the models [7], [8], and [15], an experiment is performed to verify the effects of out-ofband interference on LNA. In the experiment, 11 models of LNA are used. The desired DTTB signal (1 signal), DTTB dummy signal (7 signals), which are 8 signals in total, and the worst signal generated by a signal generator (SG) as the IMT downlink signal (15 MHz 2 [773 MHz to 803 MHz]) are input to those LNA.

55 Main Points (3.3.2 (1)) study on out-of-band interference from IMT downlink to DTTB The IMT downlink signal input levels are attenuated with an attenuator by DTTB signal input level to check the IMT downlink signal input levels at which there are no effects on DTTB receivers. As DTTB channels for measurements, two channels: 52 ch, which is assumed to be most affected, and 46 ch, which is assumed to be significantly affected by the intermodulation by the IMT uplink signal and IMT downlink signal, are used. Detailed measurements are performed for all 11 models. The presence or absence of the effects of interference is visually checked for 20 seconds.

56 Main Points (3.3.2 (1)) study on out-of-band interference from IMT downlink to DTTB Fig shows measurement results by model and Table shows the results of the model indicating the worst characteristics by DTTB signal input level for each DTTB measurement channel. From the experiment results, the following is found regarding 52 ch, which is assumed to be most affected: when the DTTB signal input level is -77 dbm/6 MHz, effects on the LNA that has the lowest proof stress are detected when the IMT downlink signal is input at -32 dbm or more. It is also found that there is a difference of 11 db between the worst value and median value of the 11 models used in the experiment.

57 Worst case -5-27=-32dB

58

59 45 db -32dBm -77dBm

60 Main Points (P (1)) study on out-of-band interference from IMT downlink to DTTB As measures, receiver filter addition to the DTTB receiving systems (receiver filter addition in front of the LNA input to avoid LNA saturation, and receiver filter addition between the LNA and DTTB receiver to avoid the desensitization of the DTTB receiver), an improvement in vertical pattern by replacement with high-performance receiver antenna, gain adjustment, and insertion of an attenuator (when the antenna has a LNA), etc., can be considered.

61 Main Points (P (1)) study on out-of-band interference from IMT downlink to DTTB TABLE Receiver filter performance values assumed to be feasible* Guardband 8 MHz 20 MHz 40 MHz 60 MHz Frequency 718 MHz 730 MHz 750 MHz 770 MHz Attenuation 10 db 30 db 30 db 30 db

62 Today s Main Theme #2

63 History of introduction of IMT in 700MHz band December 27, 2011 February 17, 2012 February 29, 2012 February 29, 2012 April 11, 2012 April 11, 2012 Appeal for opinions on draft report from MIC technical Council for foster mobile phones Technical Requirements for mobile communications systems using 700MHz bands Appeal for opinions on Ministerial Ordinance and Bulletin Plans relating to Technical Requirements for mobile communications systems using 700MHz band Appeal for opinions on draft guidelines for establishment of special base stations using 700MHz band Results of appeal for opinions on draft guidelines for establishment of special base stations using 700MHz band and Appeal for opinions on Ministerial Ordinance and Bulletin Plans relating to Technical Requirements for mobile communications systems using 700MHz band Report from the MIC regulatory Council(Radio Regulatory Council)

64 How to calculate the cost!?

65 Method of Calculation Step-1 Estimation of number of boosters that were installed to homes Step-2 Estimation of number of boosters for which there are a need to take filter-installation measures Step-3 Estimation of cost

66 Parameter used for Test Classification of LTE Input Signal Downlink only Variable-width of LTE Input Signal Level From -85 dbm to -5dBm Bandwidth of Guard Band 63MHz Bandwidth of LTE Downlink From 773MHz to 803 MHz Power of LTE Downlink Dummy Ch to verify Maximum (36dBm/MHz) Total = 7 chs (45,(46),47,48,49,50,51,(52)) () is not input when the channel is to verify 46 ch, 52 ch Digital TV Input Level -77 dbm, -39dBm (Full Segment) 66

67 LTE Input: -32dBm (=-5-27) Worst Booster LTE Input: -14dBm (=-5-9) Best Booster Best : -14dBm Middle: -21dBm Worst: -32dBm (TV:-77dBm, Ch to verify: 52ch) 67

68 Metropolis (Dense Urban) Building-Area Ratio More than 10% Building Height (Average) More than 20m Urban More than 10% Less than 20m Suburban Countryside (Open Area) Not less than 2% and less than 10% Less than 2% - - Propagation Formula Ex-HATA Dense Urban Ex-HATA Urban Ex-HATA suburban Ex-HATA Open Area Radius of cell (Average) 350m 570m 850m 1,200m

69 Investigated Number of Buildings with Boosters Type of building Type of region Metropolis (Dense Urban) Individual reception Number of samples Type of reception Cable TV (including TV via IP) Shared reception Only Satellite Individual or shared reception with boosters Ratio of buildings with boosters a b c d e e/(a+b+c+d) % Residence Urban % Suburban % Countryside (Open Area) % Not Residence All regions %

70 Computer Simulated Interfered Location Ratio Residence Not Residence Metropolis (Dense Urban) 12.9% 6.6% Urban 18.3% 34.7% Suburban 22.4% 32.2% Countryside (Open Area) 44.5% 17.3%

71 Estimated Cost of Countermeasures (upper: residence, lower: not residence) Actual Number of buildings (thousands) (a) Ratio of buildings with boosters (b) Number of buildings with boosters (thousands) (c) Interfered location ratio (d) Number of interfered buildings (thousands) (c) (d) Subtotal (e) Cost of countermeasures (e) 50,000JPY Metropolis (Dense Urban) % 100.0% % 6.6% billion JPY Urban % 100.0% % 34.7% billion JPY Suburban % 100.0% % 32.2% billion JPY Countryside (Open Area) % 100.0% % 17.3% billion JPY Total billion JPY (3 billion USD)

72 Solutions

73 Filer should be inserted!

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75 Activities from now!

76 Establishment of new association Association of 700 MHz Frequency Promotion Role: 1. Migration of FPU and Specified Radio Microphones to whitespace / 1.2 GHz/ 2.3 GHz 2. Preventions of harmful interference from IMT to DTTB

77 Thank you for your attention!