Uplink control data transmission
Methods and systems for transmitting uplink control information and feedback are disclosed for carrier aggregation systems. A user equipment device may be configured to transmit uplink control information and other feedback for several downlink component carriers using one or more uplink component carriers. The user equipment device may be configured to transmit such data using a physical uplink control channel rather than a physical uplink shared channel. The user equipment device may be configured to determine the uplink control information and feedback data that is to be transmitted, the physical uplink control channel resources to be used to transmit the uplink control information and feedback data, and how the uplink control information and feedback data may be transmitted over the physical uplink control channel.
1. A channel coding method in a user equipment (UE) comprising:
generating a set of bits associated with feedback information, wherein the feedback information comprises one or more acknowledgement/negative acknowledgement (ACK/NACK) bits;
on a condition that transmission of the feedback information coincides with transmission of a scheduling request (SR), appending an SR bit to the set of bits associated with the feedback information;
jointly encoding the set of bits associated with the feedback information and the appended SR bit into jointly encoded control information bits;
scrambling the jointly encoded control information bits to generate scrambled control information bits;
modulating the scrambled control information bits to generate modulated symbols;
determining an orthogonal sequence index;
spreading the modulated symbols block-wise using at least one orthogonal sequence indicated by the orthogonal sequence index; and
transmitting the block-wise spread modulated symbols associated with the jointly encoded control information bits on a physical uplink control channel (PUCCH).
2. The method of claim 1 , wherein the orthogonal sequence index is determined based on a radio resource control (RRC) message.
3. The method of claim 2 , wherein one of the at least one orthogonal sequence is associated with a configured code length.
4. The method of claim 3 , wherein the at least one orthogonal sequence comprises a first orthogonal sequence and a second orthogonal sequence, wherein the first orthogonal sequence is applied to a first set of symbols and the second orthogonal sequence is applied to a second set of symbols.
5. The method of claim 4 , wherein the second orthogonal sequence is determined based on a second orthogonal sequence index.
6. The method of claim 1 , wherein the at least one orthogonal sequence is used to spread at least a portion of the modulated symbols over a set of orthogonal frequency division multiplexing (OFDM) symbols.
7. The method of claim 1 , wherein a positive SR is encoded as a binary 1 and a negative SR is encoded as a binary 0.
8. The method of claim 1 , wherein the bits associated with the feedback information and the appended SR bit are jointly encoded using a Reed-Muller code.
9. The method of claim 1 , comprising applying a circular repetition on the jointly encoded control information bits.
10. The method of claim 1 , wherein the block-wise spread modulated symbols are transmitted using a discrete Fourier Transform-spread-orthogonal frequency division multiplexing (OFDM) (DFT-s-OFDM) based PUCCH structure.
11. The method of claim 1 , wherein the one or more acknowledgement/negative acknowledgement (ACK/NACK) bits are associated with a plurality of component carriers.
12. A user equipment (UE) comprising:
a processor configured to at least:
generate a set of bits associated with feedback information, wherein the feedback information comprises one or more acknowledgement/negative acknowledgement (ACK/NACK) bits;
on a condition that transmission of the feedback information coincides with transmission of a scheduling request (SR), appending an SR bit to the set of bits associated with the feedback information;
jointly encode the set of bits associated with the feedback information and the appended SR bit into jointly encoded control information bits;
scramble the jointly encoded control information bits to generate scrambled control information bits;
modulate the scrambled control information bits to generate modulated symbols;
determining an orthogonal sequence index;
spread the modulated symbols block-wise using at least one orthogonal sequence indicated by the orthogonal sequence index; and
transmit the block-wise spread modulated symbols associated with the jointly encoded control information bits on a physical uplink control channel (PUCCH).
13. The UE of claim 12 , wherein the orthogonal sequence index is determined based on a radio resource control (RRC) message.
14. The UE of claim 13 , wherein one of the at least one orthogonal sequence is associated with a configured code.
15. The UE of claim 14 , wherein the at least one orthogonal sequence comprises a first orthogonal sequence and a second orthogonal sequence, wherein the first orthogonal sequence is applied to a first set of symbols and the second orthogonal sequence is applied to a second set of symbols.
16. The UE of claim 15 , wherein the second orthogonal sequence is determined based on a second orthogonal sequence index.
17. The UE of claim 12 , wherein the at least one orthogonal sequence is used to spread at least a portion of the modulated symbols over a set of orthogonal frequency division multiplexing (OFDM) symbols.
18. The UE of claim 12 wherein a positive SR is encoded as a binary 1 and a negative SR is encoded as a binary 0.
19. The UE of claim 12 , wherein the bits associated with the feedback information and the appended SR bit are jointly encoded using a Reed-Muller code.
20. The UE of claim 12 , wherein the processor is configured to apply a circular repetition on the jointly encoded control information bits.
21. The UE of claim 12 , wherein the block-wise spread modulated symbols are transmitted using a discrete Fourier Transform-spread-orthogonal frequency division multiplexing (OFDM) (DFT-s-OFDM) based PUCCH structure.
22. The UE of claim 12 , wherein the one or more acknowledgement/negative acknowledgement (ACK/NACK) bits are associated with a plurality of component carriers.