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HSPA+ 42Mbps Technology and Results. 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
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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
Technology Background: Capacity Gain = other traffic f2 f1 SC-HSPA User Time f2 f1 DC-HSPA User Time
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
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
Impact on F1 Ec/No Coverage Ec/No Distribution: hs Power
DC-HSPA Throughput (Inbuilding) • With 13 HS codes and 64QAM, maximum throughput (stationary) ~30Mbps • No other users in the cells Multicarrier 21mbps
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
Throughput CDF (SC vs DC) Throughput increases in DC mode compared to SC mode
Throughput Distribution (SC vs MC) Throughput increases in DC mode compared to SC mode
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