horizons, it is unlikely that spectrum sharing between DTTB and IMT is possible within a given geographic location. 5 (to Section II) Study 5 Mobile service as an interferer: interference from mobile service – basestations into broadcasting service reception outside the GE06 area 1 Methods of calculation with formulas In order to estimate multiple adjacent channels cumulative effect of interference from IMT basestation to DTT in particular DVB-T system, following steps are done: first, the field strength threshold of IMT base station is calculated using criteria; I/N – then, single base-station is evaluated and required separation distance to meet this value is – calculated; then a network of IMT consisting of several base-stations is constructed and cumulative – effect is evaluated; finally, required separation distance by considering cumulative effect is calculated. – The above steps are further described in detail in following sections. 2 Calculations 2.1 strength threshold of IMT base station at different frequency offsets In order to calculate the field strength threshold of IMT base station at different frequency offsets, the criterion dB is used. The methodology is similar to what proposed in Report ITUR I/N I/N= –10 BT.2265 (Annex 1). Frequency offset is the separation between the channel centres of the IMT and DTT systems. Then, using protection ratios at different frequency offsets and assuming = 690 MHz, f(MHz) median effective interfering field strength threshold for a reception location probability of 95% (EINT) will be derived as shown in Table 1 below. 1 Interferer PR EINT offset PR (dB) (dB(µV/m)) N/(MHz) 1/(10 MHz) 51.3 –25.7 2/(18 MHz) 47.5 –21.9 3/(26 MHz) 50.5 –24.9 4/(34 MHz) 54.5 –28.9 5/(42 MHz) 58.4 –32.8
horizons, it is unlikely that spectrum sharing between DTTB and IMT is possible within a given geographic location. 5 (to Section II) Study 5 – Mobile service as an interferer: interference from mobile service basestations into broadcasting service reception outside the GE06 area 1 Methods of calculation with formulas In order to estimate multiple adjacent channels cumulative effect of interference from IMT basestation to DTT in particular DVB-T system, following steps are done: – first, the field strength threshold of IMT base station is calculated using I/N criteria; – then, single base-station is evaluated and required separation distance to meet this value is calculated; – then a network of IMT consisting of several base-stations is constructed and cumulative effect is evaluated; – finally, required separation distance by considering cumulative effect is calculated. The above steps are further described in detail in following sections. 2 Calculations 2.1 strength threshold of IMT base station at different frequency offsets In order to calculate the field strength threshold of IMT base station at different frequency offsets, the I/N criterion I/N= –10 dB is used. The methodology is similar to what proposed in Report ITUR BT.2265 (Annex 1). Frequency offset is the separation between the channel centres of the IMT and DTT systems. Then, using protection ratios at different frequency offsets and assuming f(MHz) = 690 MHz, median effective interfering field strength threshold for a reception location probability of 95% (EINT) will be derived as shown in Table 1 below. 1 Interferer offset N/(MHz) PR PR (dB) EINT (dB(µV/m)) 1/(10 MHz) –25.7 51.3 2/(18 MHz) –21.9 47.5 3/(26 MHz) –24.9 50.5 4/(34 MHz) –28.9 54.5 5/(42 MHz) –32.8 58.4
R-REP-BT.2337-2014-MSW-E.docx