How did 3GPP manage to increase the speed to DL speed to 10Mbps?

To increase the data rates a new channel called HS-DSCH (High speed downlink shared channel) was defined. This was somewhat similar to the DSCH defined in the release 99 specs. This channel maps to HS-PDSCH (high speed physical downlink shared channel).

To support this data channel a control channel HS-SCCH (High speed shared control channels). The HS-DSCH is transmitted over the entire cell or over only part of the cell using e.g. Beam-forming antennas. The increased data rates are supported through the introduction of Fast and Complex channel-control mechanisms based on a short fixed packet TTI (transmission time interval), AMC (adaptive modulation and coding) and L1 HARQ (layer1 hybrid automatic repeat request).

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