Method and apparatus for encoding channel quality indicator and precoding control information bits
A method and apparatus for encoding channel quality indicator (CQI) and precoding control information (PCI) bits are disclosed. Each of the input bits, such as CQI bits and/or PCI bits, has a particular significance. The input bits are encoded with a linear block coding. The input bits are provided with an unequal error protection based on the significance of each input bit. The input bits may be duplicated based on the significance of each input bit and equal protection coding may be performed. A generator matrix for the encoding may be generated by elementary operation of conventional basis sequences to provide more protection to a most significant bit (MSB).
1. A method for encoding type B information bits, the method comprising:
generating type B information bits including channel quality indicator (CQI) bits and precoding control information (PCI) bits;
encoding the type B information bits using a (20, 7) code to generate an output codeword, a minimum distance of the (20, 7) code being eight (8), weight distribution of the (20, 7) code providing better protection to a most significant bit (MSB) the CQI bits; and
sending the output codeword.
2. The method of claim 1 wherein the (20, 7) code is a non-subset code of (20, 10) code for type A information bits.
3. The method of claim 1 wherein the (20, 7) code is a subset code of (20, 10) code for type A information bits with one bit flipping.
4. The method of claim 1 wherein a generator matrix for the (20, 7) code is as follows:
1
0
0
0
0
0
0
1
1
0
0
0
1
1
1
0
1
0
1
0
0
1
0
0
0
0
0
1
0
1
1
0
0
1
0
0
1
1
1
0
0
0
1
0
0
0
0
1
0
1
0
1
1
0
0
1
1
0
1
0
0
0
0
1
0
0
0
1
0
1
0
0
1
1
1
1
0
1
0
0
0
0
0
0
1
0
0
1
0
0
1
1
1
0
1
0
1
1
0
0
0
0
0
0
0
1
0
1
0
0
1
1
0
1
1
1
0
0
1
0
0
0
0
0
0
0
1
0
1
1
1
1
1
1
1
1
1
1
1
1
.
5. A wireless transmit/receive unit (WTRU) for encoding type B information bits, the WTRU comprising:
a data generator for generating type B information bits including channel quality indicator (CQI) bits and precoding control information (PCI) bits;
an encoder for encoding the type B information bits using a (20, 7) code to generate an output codeword, a minimum distance of the (20, 7) code being eight (8), weight distribution of the (20, 7) code providing better protection to a most significant bit (MSB) of the CQI bits; and
a transmitter for sending the output codeword.
6. The WTRU of claim 5 wherein the (20, 7) code is a non-subset code of (20, 10) code for type A information bits.
7. The WTRU of claim 5 wherein the (20, 7) code is a subset code of (20, 10) code for type A information bits with one bit flipping.
8. The WTRU of claim 5 wherein a generator matrix for the (20, 7) code is as follows:
1
0
0
0
0
0
0
1
1
0
0
0
1
1
1
0
1
0
1
0
0
1
0
0
0
0
0
1
0
1
1
0
0
1
0
0
1
1
1
0
0
0
1
0
0
0
0
1
0
1
0
1
1
0
0
1
1
0
1
0
0
0
0
1
0
0
0
1
0
1
0
0
1
1
1
1
0
1
0
0
0
0
0
0
1
0
0
1
0
0
1
1
1
0
1
0
1
1
0
0
0
0
0
0
0
1
0
1
0
0
1
1
0
1
1
1
0
0
1
0
0
0
0
0
0
0
1
0
1
1
1
1
1
1
1
1
1
1
1
1
.
9. A method for encoding channel quality indicator (CQI) bits in a wireless transmit/receive unit (WTRU), the method comprising:
generating CQI bits;
encoding the CQI bits;
applying a gain factor B hs to the CQI bits; and
sending the encoded CQI bits, wherein the gain factor β hs , for the CQI bits is derived from a quantized amplitude ratio (A hs =β hs /β c ), β c being a gain factor for a dedicated physical control channel (DPCCH), and wherein if the WTRU is configured in multiple-input multiple-output(MIMO) mode, A hs equals the quantized amplitude ratio translated from a signaled value ΔCQI+1 when a CQI of type A is transmitted.
10. The method of claim 9 wherein for time slots carrying the CQI bits, if the WTRU is not configured in multiple-input multiple-output (MIMO) mode, A hs equals the quantized amplitude ratio translated from the signaled value Δ CQI .
11. The method of claim 9 wherein for time slots carrying the CQI bits, if the WTRU is configured in multiple-input multiple-output (MIMO) mode, A hs equals the quantized amplitude ratio translated from the signaled value Δ CQI when a CQI of type B is transmitted.
12. The method of claim 9 , wherein A hs is translated to 38/15 when the signaled value Δ CQI+ 1 equals to 9.
13. The method of claim 9 , wherein β hs is a gain factor for a high speed dedicated physical control channel (HS-DPCCH).
14. A wireless transmit/receive unit (WTRU) for encoding channel quality indicator (CQI) bits, the WTRU comprising:
a CQI generator for generating CQI bits;
an encoder for encoding the CQI bits; and
a transmitter for applying a gain factor β hs to the CQI bits and sending the encoded CQI bits, wherein the gain factor β hs for the CQI bits is derived from a quantized amplitude ratio (A hs =β hs /β c ), β c being a gain factor for a dedicated physical control channel (DPCCH), and wherein A hs equals to the quantized amplitude ratio translated from a signaled value Δ CQI+ 1 when a CQI of type A is transmitted.
15. The WTRU of claim 14 wherein for time slots carrying the CQI bits, if the WTRU is not configured in multiple-input multiple-output (MIMO) mode, A hs equals the quantized amplitude ratio translated from the signaled value Δ CQI .
16. The WTRU of claim 14 wherein for time slots carrying the CQI bits, if the WTRU is configured in multiple-input multiple-output (MIMO) mode, A hs equals the quantized amplitude ratio translated from the signaled value Δ CQI when a CQI of type B is transmitted.
17. The WTRU of claim 14 , wherein A hs , is translated to 38/15 when the signaled value Δ CQI+ 1 equals to 9.
18. The WTRU of claim 14 , wherein β hs is a gain factor for a high speed dedicated physical control channel (HS-DPCCH).