Introduction to The Guidelines for the Long-term Sustainability of Outer Spac...
Puttachad Manmontri - READI ASPF-5
1. Spectrum Management Bureau, Office of NBTC
สำนักงำนคณะกรรมกำรกิจกำรกระจำยเสียง กิจกำรโทรทัศน์ และกิจกำรโทรคมนำคมแห่งชำติ
The National Broadcasting and Telecommunications Commission
March 2015
INTERFERENCES
BETWEEN E-GSM 900 MHz AND HSPA 850 MHz
ALONG THAILAND BORDER
2. The National Broadcasting and Telecommunications Commission
Thailand current usage in band 800/900 MHz
2
Trunked
Radio
(DL)
Land
mobile
/fixed
Cellular/
CAT
849 894 897.5 915
Cellular/
TOT/AIS
960942.5
Cellular/
TOT/AIS
RFID
920
925
Cellular/
CAT/DTAC
839
Cellular/
CAT
Cellular/
CAT/DTAC
884824 851 869861
HSPA 850 HSPA 850
GSM 900/
HSPA 900
GSM 900/
HSPA 900
824 849 869 894 897.5 915 942.5 960
3. The National Broadcasting and Telecommunications Commission
Situation along common border
3
HSPA 850
E-GSM 900
894
880 915
869
Thailand
Neighboring
countries
Reverse duplex
interference
4. The National Broadcasting and Telecommunications Commission
Mitigation techniques
4
1
• Frequency retune
• Band segmentation
2
• Filtering
3
• Reduction of transmitting power
4
• Antenna downtilt
5. The National Broadcasting and Telecommunications Commission
Mitigation techniques
5
Frequency Retune/Band segmentation
A B A B
Frequency Retune: for some areas along the border
Band Segmentation: for all areas along the border
7. The National Broadcasting and Telecommunications Commission
Mitigation techniques
7
Reduction of transmitting power
Without band segmentation:
Power < -98 dBm/200 MHz at 3 km from the border
With band segmentation:
Power < -98 dBm/200 MHz at 30 km from the border
Examples
8. The National Broadcasting and Telecommunications Commission
Mitigation techniques
8
Antenna downtilt
Mechanical Tilt
Electrical Tilt
9. The National Broadcasting and Telecommunications Commission
Conclusion
9
For short term solution, combination of different mitigation
techniques can be used to reduce reverse duplex
interference.
For long term solution, spectrum harmonization is
recommended.
10. The National Broadcasting and Telecommunications Commission
Thank you
Spectrum Management Bureau
Office of the National Broadcasting and
Telecommunications Commission (NBTC)
Tel. 0 2271 0151-60 ext. 907, 903, 653, 915
Email: spectrum@nbtc.go.th