Generation of HARQ-ACK information and power control of HARQ-ACK signals in TDD systems with downlink of carrier aggregation
Methods and apparatus are provided for a User Equipment (UE) configured to have multiple cells in a DownLink (DL) of a Time Division Duplex (TDD) communication system so as to determine a power of an acknowledgement signal that the UE transmits in a control channel and to determine a number of acknowledgement information bits that the UE multiplexes with data information bits in a data channel. A transmission power of the control signal is determined based on DL Assignment Index (DAI) Information Elements (IEs) in DL Scheduling Assignments (SAs) that the UE detects through multiple transmission time intervals and through the multiple configured DL cells. The number of acknowledgement information bits in the data channel is determined based on a DAI IE of an UpLink (UL) SA associated with the transmission of the data channel.
1. A method for wireless communication, the method comprising:
receiving at least one transport block (TB) within a bundling window in a cell among configured cells;
generating acknowledgement bits in response to the received at least one TB based on a number of the configured cells and a transmission mode of each of the configured cells; and
transmitting the generated acknowledgement bits on a physical uplink control channel (PUCCH),
wherein the generated acknowledgement bits comprise a number of bits corresponding to a size of the bundling window for a first configured cell having a transmission mode conveying a maximum of one TB and a number of bits corresponding to twice a size of the bundling window for a second configured cell having a transmission mode conveying a maximum of two TBs.
2. The method of claim 1 , further comprising:
determining a transmit power based on a number of the received at least one TB and a number of missed downlink scheduling assignments,
wherein the generated acknowledgement bits are transmitted using the transmit power.
3. The method of claim 2 ,
wherein the number of missed downlink scheduling assignments is derived from V_dl_dai_c and U_dai_c,
wherein the V_dl_dai_c is a downlink assignment index (DAI) value included in a last downlink scheduling assignment detected within the bundling window in the cell, and
wherein the U_dai_c is a total number of downlink scheduling assignments detected within the bundling window in the cell.
4. The method of claim 1 , wherein the method is operated in a user equipment (UE) being configured by a base station to have the configured cells.
5. The method of claim 1 , wherein the method is operated in a time division duplex (TDD) communication system.
6. A user equipment (UE) apparatus for wireless communication, the apparatus comprising:
a transceiver configured to receive at least one transport block (TB) within a bundling window in a cell among configured cells and to transmit acknowledgement bits on a physical uplink control channel (PUCCH); and
a controller configured to generate the acknowledgement bits in response to the received at least one TB based on a number of the configured cells and a transmission mode of each of the configured cells,
wherein the generated acknowledgement bits comprise a number of bits corresponding to a size of the bundling window for a first configured cell having a transmission mode conveying a maximum of one TB and a number of bits corresponding to twice a size of the bundling window for a second configured cell having a transmission mode conveying a maximum of two TBs.
7. The apparatus of claim 6 ,
wherein the controller is further configured to determine a transmit power based on a number of the received at least one TB and a number of missed downlink scheduling assignments, and
wherein the generated acknowledgement bits are transmitted using the transmit power.
8. The apparatus of claim 7 ,
wherein the number of missed downlink scheduling assignments is derived from V_dl_dai_c and U_dai_c,
wherein the V_dl_dai_c is a downlink assignment index (DAI) value included in a last downlink scheduling assignment detected within the bundling window in the cell, and
wherein the U_dai_c is a total number of downlink scheduling assignments detected within the bundling window in the cell.
9. The apparatus of claim 6 , wherein the apparatus is configured by a base station to have the configured cells.
10. The apparatus of claim 6 , wherein the apparatus is operated in a time division duplex (TDD) communication system.
11. A method for wireless communication, the method comprising:
transmitting, to a user equipment (UE), at least one transport block (TB) within a bundling window in a cell among configured cells; and
receiving acknowledgement bits on a physical uplink control channel (PUCCH),
wherein the received acknowledgement bits are generated in response to the transmitted at least one TB based on a number of the configured cells and a transmission mode of each of the configured cells for the UE, and
wherein the generated acknowledgement bits comprise a number of bits corresponding to a size of the bundling window for a first configured cell having a transmission mode conveying a maximum of one TB and a number of bits corresponding to twice a size of the bundling window for a second configured cell having a transmission mode conveying a maximum of two TBs.
12. The method of claim 11 , wherein the received generated acknowledgement bits are transmitted, from the UE, using a transmit power determined based on a number of the transmitted at least one TB and a number of missed downlink scheduling assignments in the UE.
13. The method of claim 12 ,
wherein the number of missed downlink scheduling assignments is derived from V_dl_dai_c and U_dai_c,
wherein the V_dl_dai_c is a downlink assignment index (DAI) value included in a last downlink scheduling assignment transmitted within the bundling window in the cell, and
wherein the U_dai_c is a total number of downlink scheduling assignments transmitted within the bundling window in the cell.
14. The method of claim 11 , wherein the method is operated in a base station configuring the UE to have the configured cells.
15. The method of claim 11 , wherein the method is operated in a time division duplex (TDD) communication system.
16. A base station apparatus for wireless communication, the apparatus comprising:
a transceiver configured to transmit, to a user equipment (UE), at least one transport block (TB) within a bundling window in a cell among configured cells and to receive acknowledgement bits on a physical uplink control channel (PUCCH),
wherein the received acknowledgement bits are generated in response to the transmitted at least one TB based on a number of the configured cells and a transmission mode of each of the configured cells for the UE, and
wherein the generated acknowledgement bits comprise a number of bits corresponding to a size of the bundling window for a first configured cell having a transmission mode conveying a maximum of one TB and a number of bits corresponding to twice a size of the bundling window for a second configured cell having a transmission mode conveying a maximum of two TBs.
17. The apparatus of claim 16 , wherein the received generated acknowledgement bits are transmitted, from the UE, using a transmit power determined based on a number of the transmitted at least one TB and a number of missed downlink scheduling assignments in the UE.
18. The apparatus of claim 17 ,
wherein the number of missed downlink scheduling assignments is derived from V_dl_dai_c and U_dai_c,
wherein the V_dl_dai_c is a downlink assignment index (DAI) value included in a last downlink scheduling assignment transmitted within the bundling window in the cell, and
wherein the U_dai_c is a total number of downlink scheduling assignments transmitted within the bundling window in the cell.
19. The apparatus of claim 16 , further comprising:
a controller configured to configure the UE to have the configured cells.
20. The apparatus of claim 16 , wherein the apparatus is operated in a time division duplex (TDD) communication system.