Band III issues

1
Band III issues
BR Information Meeting on RRC-04/05 (Geneva, 18
19 September 2003)

• (Overview of the activities within Task Group
  6/8 Use of the band 174 230 MHz)
• Ben Smith
• Radiocommunications Agency Netherlands

2
Overview Band III issues (Chap.7)

• Why special attention for Band III ?
• Frequency usage of Band III and sharing
  between digital sound and television
  broadcasting
• Physics orders of magnitude
• History ST52/GE63 .
• Choices for planning type of systems, rasters
• Sharing scenarios
• Open (technical) issues
• Future flexibility, but how ?

3
What is so special about Band III ?

• Physics 174-230 vs. 470-862 MHz for Band IV/V
• (or 1.71.3 vs. 0.64-0.35 m)

4
What is so special about Band III ?

• Long history of existing stations
• ST52 and ST61 for EBA
• GE63 and GE89 for ABA
• Resulting in a mixture of systems and rasters

5
What is so special about Band III ?

• Different systems to be planned television AND
  sound
• Bandwidths analog TV(7 and 8 MHz), DVB-T(6,7 or
  8MHz), T-DAB(1.75MHz)
• Different characteristics minimum field
  strength, protection ratio

6
What is so special about Band III ?

• Different characteristics minimum field strength

7
What is so special about Band III ?

• Different characteristics max. interfering
  field strength

8
Different characteristics max. interfering
field strength (1)
9
Different characteristics max. interfering
field strength (2)
10
Different characteristics max. interfering
field strength (3)
11
What is so special about Band III ?

• Different characteristics max. interfering
  field strength

12
Sharing scenarios for sound and television

• single service
• very easy planning, rigid, not satisfactory
• partitioning of the band
• complicated, restricted flexibility, more
  efficient
• mixed digital sound and television
• complex, most flexible, most efficient overall

13
Open (technical) issues

• Re-channeling ??
• simpler, looks more efficient
• cost sometimes spectrum, many times money,
  complex introduction
• Propagation model ??
• Rec. 1546 and/or 370 based methods, incl. GE89
• 1546 stability after May 2004 ?
• continuity of existing rights
• only 1 model in a frequency band for all
  services, but may be different for different
  parts of the planning area

14
Future of Band III

• Prediction is difficult, especially about the
  future (of Band III)
• Therefore, lets try to build flexibility into the
  planning,
• even for system changes afterwards.