Method for uplink acknowledgement/non-acknowledgement messages in a wireless communication system
A method for uplink ACK/NACK for LTE TDD. The method includes receiving a frame having multiple subframes wherein a plurality of subframes being downlink subframes and at least one subframe being an uplink subframe. One uplink subframe can contain an acknowledgment/non-acknowledgment (ACK/NACK) corresponding to at least one of the plurality of downlink subframes. To transmit ACK/NACKs, one uplink subframe for ACK/NACK is used in response to one of the plurality of downlink subframes. In addition, ACK/NACK responses can be bundled into one uplink subframe for at least two of the plurality of downlink subframes. In an embodiment, multiple ACK/NACK responses can be used in one uplink subframe that corresponds to at least two of the plurality of downlink subframes in a multiple feedback configuration. One uplink subframe for ACK/NACK responses and bundling multiple ACK/NACK responses is for a bundled feedback configuration.
1. A method comprising:
receiving in an uplink subframe an acknowledgment/non-acknowledgment response (ACK/NACK), wherein the response corresponds to multiple ACK/NACK for at least two of a plurality of downlink subframes;
determining one of an uplink ACK/NACK physical uplink control channel (PUCCH) index using one of a user equipment identification and a parameter given in a dynamic downlink scheduling assignment; and
determining an uplink ACK/NACK physical uplink control channel (PUCCH) index using a lowest control channel number and a parameter given in a last received dynamic downlink scheduling assignment.
2. The method of claim 1 further comprising selecting between a bundled ACK/NACK feedback configuration on the PUCCH and a multiple ACK/NACK feedback configuration on the PUCCH.
3. The method of claim 2 wherein the bundled ACK/NACK feedback configuration includes one of a one-bit physical control channel format (PUCCH) and a two-bit PUCCH format.
4. The method of claim 2 wherein the multiple ACK/NACK feedback configuration uses a channel quality indicator transmission configuration.
5. The method of claim 1 further comprising assigning user equipment to one of a bundled ACK/NACK feedback configuration and a multiple ACK/NACK feedback configuration.
6. The method of claim 5 further comprising configuring user equipment between the selected bundled ACK/NACK feedback configuration and the multiple ACK/NACK feedback configuration based on channel conditions.
7. The method of claim 1 further comprising transmitting N bits where N is the number of downlink subframes associated with an uplink subframe.
8. The method of claim 1 further comprising transmitting two times N bits where N is the number of downlink subframes associated with an uplink subframe.
9. The method of claim 1 further comprising transmitting a channel quality indicator format on the physical uplink control channel.
10. A system, comprising:
a memory storing one or more instructions;
an antenna adapted to receive in an uplink subframe an acknowledgment/non-acknowledgment response (ACK/NACK), wherein the response corresponds to multiple ACK/NACK for at least two of a plurality of downlink subframes; and
one or more processors in communication with the memory and the antenna, the one or more processors configured to:
determine one of an uplink ACK/NACK physical uplink control channel (PUCCH) index using one of a user equipment identification and a parameter given in a dynamic downlink scheduling assignment; and
determine an uplink ACK/NACK physical uplink control channel (PUCCH) index using a lowest control channel number and a parameter given in a last received dynamic downlink scheduling assignment.
11. The system of claim 10 , wherein the one or more computing devices are further configured to select between a bundled ACK/NACK feedback configuration on the PUCCH and a multiple ACK/NACK feedback configuration on the PUCCH.
12. The system of claim 11 , wherein the bundled ACK/NACK feedback configuration includes one of a one-bit physical control channel format (PUCCH) and a two-bit PUCCH format.
13. The system of claim 11 , wherein the multiple ACK/NACK feedback configuration uses a channel quality indicator transmission configuration.
14. The system of claim 10 , further configured to assign user equipment to one of a bundled ACK/NACK feedback configuration and a multiple ACK/NACK feedback configuration.
15. The system of claim 14 , wherein the one or more computing devices are further configured to configure user equipment between the selected bundled ACK/NACK feedback configuration and the multiple ACK/NACK feedback configuration based on channel conditions.
16. The system of claim 10 , wherein the one or more computing devices are further configured to transmit N bits where N is the number of downlink subframes associated with an uplink subframe.
17. The system of claim 10 , wherein the one or more computing devices are further configured to transmit two times N bits where N is the number of downlink subframes associated with an uplink subframe.
18. The system of claim 10 , wherein the one or more computing devices are further configured to transmit a channel quality indicator format on the physical uplink control channel.
19. A non-transitory machine readable medium on which instructions are stored, the instructions, when executed by one or more computing devices, cause the one or more computing devices to perform a method, the method comprising:
receiving in an uplink subframe an acknowledgment/non-acknowledgment response (ACK/NACK), wherein the response corresponds to multiple ACK/NACK for at least two of a plurality of downlink subframes;
determining one of an uplink ACK/NACK physical uplink control channel (PUCCH) index using one of a user equipment identification and a parameter given in a dynamic downlink scheduling assignment; and
determining an uplink ACK/NACK physical uplink control channel (PUCCH) index using a lowest control channel number and a parameter given in a last received dynamic downlink scheduling assignment.
20. The medium of claim 19 , wherein the method further comprises selecting between a bundled ACK/NACK feedback configuration on the PUCCH and a multiple ACK/NACK feedback configuration on the PUCCH.