3g Sectorization (sector Split) 3t1e52

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3G Sectorization (Sector Split) Pros & Cons

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• Capacity Expansion in 3G/4G  Carrier Addition (Not Possible since TP has only one carrier)  New Site deployment (High Cost of implementation due to rentals/ SA, OPEX etc.)  MIMO (Major impact on peak data rate only. Cell edge throughput is not increased as MIMO is available in good channel conditions)  Sector splitting (Used in areas where rapid capacity addition is required)

3G Sector Split

• The 6-sector network gain comes from the cell number gain: 100% • The network capacity gain is less than 100% because there is more interference between cells. • Coverage enhancement due to antenna gain resulting in around 20% more coverage

Challenges in Sector Split

• Sector Overlap The sector Overlap in Downlink results in poor EcNo and CQI in the null areas near the site.

• Neighbor Optimization The cell splitting from 3 to 6 cells per site require higher number of neighbor relations to be defined per cell and require more precision.

Why Split Antenna 65 °3 sector general antenna

33 °6-sector antenna

6-sector split antenna

Antenna Pattern (Twin Beam vs 3 Sector Antenna 6500) Loss of Coverage in Bore Direction due to 5 dB low gain

650 BW Antenna

• Loss of coverage footprint in bore direction due to 5 dB lower gain in Twin Beam 380 BW Antenna

Null. • Improved coverage in side lobes due to 5~7dB higher gain in the Direction of Twin Beams • EcNo degradation in Main lobes due

Degraded EcNo due to overlap area of Twin beams

to overlap of twin beams near the site

Sectorization Capacity Tradeoff • According to Shannon’s Law, increasing capacity in a given channel bandwidth requires Wireless Service Providers to improve the signal-tonoise ratio and/or increase frequency reuse. • In 3G and 4G LTE networks, noise containment in the RF path is critical. External noise from a variety of sources — including multi-path reflection, environmental noise and interference from adjacent or nearby cells. • To maximize the cell DL capacity, inter cell interference should be minimum in order to improve the CQI (Channel Quality Index). • In case of Increase in overlap area resulting due to higher order sectorization, the Inter-cell interference will increase. This will result in diminishing gains in of capacity gain for higher order sectorization.

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