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HSDPA Code Tree

SF2 SF4 SF8 SF16 SF32 SF64 SF128 SF256

5 codes reserved for HSDPA

(40 potential codes not used for voice)

Every single SF16 code can

potentially carry 8 typical

voice calls (SF128)

10 codes reserved for HSDPA would

leave room for 36 voice users in the cell

With 15 HSDPA codes there is room for

only 4 voice calls in the cell

Partially used by control channels

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HSDPA Terminal categories

1211

1.8 Mbps0.9 Mbps --Soft2QPSK only

--Soft1QPSK only

10

9

8

7

6

5

4

3

2

1

HSDPA UE

Category

-

-

-

-

3.6 Mbps

3.6 Mbps

1.8 Mbps

1.8 Mbps

1.2 Mbps

1.2 Mbps

5 Codes

QPSK/16QAM

QPSK/16QAM

QPSK/16QAM

QPSK/16QAM

QPSK/16QAM

QPSK/16QAM

QPSK/16QAM

QPSK/16QAM

QPSK/16QAM

QPSK/16QAM

Modulation

14.4 Mbps

10.1 Mbps

-

-

-

-

-

-

-

-

15 Codes

-IR1

-Soft1

7.2 MbpsIR1

7.2 MbpsSoft1

-IR1

-Soft1

-IR2

-IR2

-IR3

-Soft3

10 CodesHARQInter-TTI

Ericsson supports up to 15

codes, Max of 14.4 Mbps

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Maximum Achievable User Bit Rate at the RLC Level As a Function of the

UE HS-DSCH CategoryandModulation Type.

HS-DSCHcategory

Max bit ratewith QPSK[Mbps]

Max bit ratewith 16QAM[Mbps]

Category 1 0.69 1.12

Category 2 0.69 1.12

Category 3 1.04 1.68

Category 4 1.04 1.68

Category 5 2.08 3.36

Category 6 2.08 3.36

Category 7 4.48 6.72

Category 8 4.48 6.72

Category 9 6.72 9.6

Category 10 6.72 13.44

Category 11 0.8 -

Category 12 1.6 -

The actual experienced user bit

rates typically will be lower

than what is stated ,due to e.g.

retransmissions and RLC

control signaling. For example,

the HARQ protocol works witha target BER of 10%, which

corresponds to a 10% decrease

of the achievable bit rate.