Feedback signaling error detection and checking in MIMO wireless communication systems
A method of feedback in a wireless transmit receive unit includes providing a precoding matrix index (PMI), error checking the (PMI) to produce an error check (EC) bit, coding the PMI and the EC bit and transmitting the coded PMI and EC bit.
1. A method of feedback in a wireless transmit receive unit (WTRU), the method comprising:
determining a number of feedback bits, wherein the feedback bits comprise at least one precoding matrix index (PMI);
attaching at least one error check (EC) bit to the feedback bits;
applying a first channel coding scheme to the feedback bits and the at least one EC bit, wherein the first channel coding scheme is selected based on the number of feedback bits; and
transmitting the feedback bits and the at least one EC bit over a data type channel.
2. The method as in claim 1 , further comprising grouping a plurality of PMIs into a plurality of PMI groups.
3. The method as in claim 1 , further comprising applying a second channel coding scheme to user data bits, wherein transmitting the feedback bits and the at least one EC bit over the data type channel comprises jointly transmitting the feedback bits and the at least one EC bit with the user data bits over the data type channel.
4. The method as in claim 1 , wherein the at least one EC bit is at least one cyclic redundancy check (CRC) bit.
5. The method as in claim 3 , wherein the first channel coding scheme is selected to be a convolutional coding scheme.
6. The method as in claim 3 , wherein the feedback bits and the at least one EC bit are transmitted with the user data bits in the same transmission time interval (TTI).
7. The method as in claim 5 , wherein the second channel coding scheme is a turbo coding scheme.
8. The method as in claim 1 , wherein the feedback bits consist of the at least one PMI and at least one channel quality index (CQI).
9. The method as in claim 1 , wherein the data type channel is a physical uplink shared channel (PUSCH).
10. The method as in claim 1 , further comprising transmitting a rank indication with the feedback bits.
11. The method as in claim 1 , wherein the feedback bits further comprise at least one channel quality index (CQI).
12. The method as in claim 1 , wherein is an acknowledge/non-acknowledge (ACK/NACK) is transmitted with the feedback bits.
13. A wireless transmit/receive unit (WTRU) comprising:
a processor configured to:
determine a number of feedback bits, wherein the feedback bits comprise at least one precoding matrix index (PMI);
attach at least one error check (EC) bit to the feedback bits; and
apply a first channel coding scheme to the feedback bits and the at least one EC bit, wherein the first channel coding scheme is selected based on the number of feedback bits; and
a transmitter configured to transmit the feedback bits and the at least one EC bit over a data type channel.
14. The WTRU as in claim 13 , wherein the processor is further configured to group a plurality of PMIs into a plurality of PMI groups.
15. The WTRU as in claim 13 , wherein the processor is further configured to apply a second channel coding scheme to user data bits, wherein the transceiver is configured to transmit the feedback bits and the at least one EC bit over the data type channel by jointly transmitting the feedback bits and the at least one EC bit with the user data bits over the data type channel.
16. The WTRU as in claim 15 , wherein the first channel coding scheme is a convolutional coding scheme.
17. The WTRU as in claim 16 , wherein the second channel coding scheme is a turbo coding scheme.
18. The WTRU as in claim 15 , wherein the processor is further configured to transmit the feedback bits and the at least one EC bit with the user data bits in the same transmission time interval (TTI).
19. The WTRU as in claim 13 , wherein the at least one EC bit is at least one cyclic redundancy check (CRC) bit.
20. The WTRU as in claim 13 , wherein the feedback bits consist of the at least one PMI and at least one channel quality index (CQI).
21. The WTRU as in claim 13 , wherein the data type channel is a physical uplink shared channel (PUSCH).
22. The WTRU as in claim 13 , wherein the transceiver is further configured to transmit a rank indication with the feedback bits.
23. The WTRU as in claim 13 , wherein the feedback bits further comprise at least one channel quality index (CQI).
24. The WTRU as in claim 13 , wherein the transceiver is further configured to transmit an acknowledge/non-acknowledge (ACK/NACK) with the feedback bits.