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Maximizing 3G Network Performance with HSPA+ 42Mbps and Dual-Carrier HSDPA Technology

HSPA+ 42Mbps technology enhances mobile network capacity and efficiency through the innovative Dual-Carrier HSDPA feature. This approach theoretically doubles downlink throughput within the cell coverage, significantly boosts HSDPA performance, and optimizes resource utilization across 5 MHz and 10 MHz frequencies. Results demonstrate peak throughput reaching 42Mbps in controlled conditions, while practical scenarios yield around 30Mbps. The technology effectively supports voice and data services, ensuring improved user experience in both stationary and mobile contexts.

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Maximizing 3G Network Performance with HSPA+ 42Mbps and Dual-Carrier HSDPA Technology

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  1. HSPA+ 42Mbps Technology and Results

  2. frequency 5 MHz 5 MHz frequency 10 MHz Technology Background • HSPA+ 42Mbps: Dual-Cell HSDPA technology in 3GPP R8 • Major Benefits: • Theoretical Peak throughput of 42Mbps • Doubling DL Throughput within the cell coverage • Increase of HSDPA coverage • Increase in utilization efficiency on both frequencies • Higher Capacity 2 x individual 5 MHz Carriers at adjacent frequencies With Dual-CellCarrier Feature Primary Serving HS-DSCH Cell Secondary Serving HS-DSCH Cell

  3. Technology Background: Capacity Gain = other traffic f2 f1 SC-HSPA User Time f2 f1 DC-HSPA User Time

  4. Technology Background: DC-HSPA User Plane

  5. Frequency Assignment F2 DCH/HS, EUL/HS, Voice+HS multiRAB F1 Single-Carrier (Current) R99 only Multi-Carrier F2 EUL/HS Serving HS-DSCH Cell Impact on Ec/No Coverage F1 R99 + DCH/HS Secondary Serving HS-DSCH Cell

  6. Impact on F1 Ec/No Coverage Results Summary • Ec/No measured with Speech Call on F1 • Ec/No improves as hsPowerMargin is increased • Changing codes showed less control on Ec/No • DCH/HS is measured on F2 in Pre-HS Activation

  7. Impact on F1 Ec/No Coverage Ec/No Distribution: hs Power

  8. DC-HSPA Throughput (Inbuilding) • With 13 HS codes and 64QAM, maximum throughput (stationary) ~30Mbps • No other users in the cells Multicarrier 21mbps

  9. Different HS resources in F1 & F2 • HS Resources (i.e power, code) are handled independently between the 2 carriers • This will mean that a significant lower HS resource or HS codes on 1 carrier will not impact the other. For example, • 59931 F1 : Available HS Power = 42 dBm • 59934 F2 : Available HS Power = 30 dBm • F1 HS Codes > F2 HS Codes • As a result, F1 will use a much larger TBS than F2 • TBS (F1) = 32264 • TBS (F2) = 25120 • MC Throughput = (32264 + 25120) / 2ms = ~28Mbps on Layer 1 • TBS (F1) = 32264 • TBS (F2) = 22968 • MC Throughput = (32264 + 22968) / 2ms = ~27Mbps on Layer 1

  10. SC 21Mbps mode – Throughput

  11. DC 42Mbps mode – Throughput

  12. Throughput CDF (SC vs DC) Throughput increases in DC mode compared to SC mode

  13. Throughput Distribution (SC vs MC) Throughput increases in DC mode compared to SC mode

  14. Voice Long – F1 EcNo (Pre-HS)

  15. Voice Long – F1 EcNo (Post-HS)

  16. Summary • Peak throughput ~30Mbps in live network inbuilding cell when there is no other user • 42Mbps is unrealistic • Dual-carrier DL throughput achieved 1.5~2 times compared to SC mode (Stationary) • DC HSPA DL throughput = ~1.2 times of SC HSPA (mobility, depending on how many users sharing and how much resources are assigned) • After HS activation on F1: • Speech KPI maintains • PS accessibility improves • HS DL throughput on F2 increases  “lesser competition” from HS users as DCH/HS users have moved to F1 cells • EcNo degrades on F1 cells Slight degradation on F1 performance

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