System and method for managing simultaneous uplink signal transmissions in carrier aggregation systems
Systems and methods for managing the transmission of multiple signals on one or more uplink (UL) channels using carrier aggregation in LTE-A systems. A UE simultaneously transmits signals such as ACK/NACK and periodic CSI using one or more uplink channels, such as a physical uplink shared channel (PUSCH) and/or a physical uplink control channel (PUCCH), by increasing the resources used to transmit at least one of those signals. According to one aspect, a UE simultaneously transmits ACK/NACK signals and periodic CSI signals by multiplexing those signals on the PUSCH. Certain aspects avoid frequently dropped periodic CSI signals and provide mechanisms to ensure that ACK/NACK signals are transmitted.
1. A method for managing wireless communications between a base station and a user equipment, the method comprising:
determining, at the user equipment, resources used to transmit an acknowledgment/nonacknowledgment signal in a channel, wherein the channel carries at least one other signal to the base station;
identifying, at the user equipment, a reason to modify the resources, wherein the reason is based, at least in part, on a payload size of an uplink control signal exceeding a threshold, the uplink control signal including at least the acknowledgment/nonacknowledgment signal, wherein the payload size includes a number of bits of the acknowledgment/nonacknowledgment signal;
in response to said identifying, modifying the resources according to the identified reason; and
transmitting, from the user equipment, the acknowledgment/nonacknowledgment signal with the modified resources and the at least one other signal in the channel to the base station.
2. The method of claim 1 , wherein the payload size of the uplink control signal includes a ratio between a payload size of the acknowledgment/nonacknowledgment signal and a payload size of the at least one other signal, wherein the reason is based, at least in part, on the payload size ratio exceeding a threshold.
3. The method of claim 1 , wherein the reason is further based on a higher layer message received from the base station.
4. The method of claim 1 , wherein the user equipment is further configured with two or more component carriers, and the at least one other signal comprises a periodic channel state information feedback signal for at least one of the two or more component carriers.
5. The method of claim 1 , wherein the at least one other signal comprises a periodic channel state information feedback signal for at least one cell of a same carrier frequency.
6. The method of claim 1 , wherein the modifying is performed, at least in part, by increasing a number of the resources used to transmit an acknowledgment/nonacknowledgment signal to the base station.
7. The method according to claim 6 , wherein increasing the number of the resources used to transmit an acknowledgment/nonacknowledgment signal to the base station comprises:
puncturing symbols allocated to other signals.
8. The method according to claim 6 , wherein the increasing the number of the resources comprises:
puncturing at least one resource on a periodic PUSCH; and
puncturing at least one additional resource on the periodic PUSCH.
9. The method of claim 1 , wherein the modifying is performed, at least in part, by increasing a power of the resources used to transmit the acknowledgment/nonacknowledgment signal to the base station.
10. The method according to claim 9 , wherein increasing the power of the resources used to transmit an acknowledgment/nonacknowledgment signal to the base station comprises:
increasing transmit power for the resources.
11. The method according to claim 9 , wherein the increasing the power of the resources comprises:
puncturing at least one resource on a periodic PUSCH; and
power boosting the periodic PUSCH.
12. The method according to claim 11 , wherein the power boosting further comprises:
power boosting all symbols allocated to the PUSCH.
13. The method according to claim 11 , wherein the power boosting further comprises:
power boosting the acknowledgment/nonacknowledgment signal allocated to the PUSCH.
14. The method according to claim 11 , wherein the power boosting further comprises:
power boosting the periodic PUSCH when a threshold is exceeded.
15. The method according to claim 1 , wherein the modifying is performed, at least in part, by joint coding the acknowledgment/nonacknowledgment signal with the at least one other signal.
16. The method of claim 1 , wherein the reason is further based on one or more of:
a type of the at least one other signal;
a payload size of the at least one other signal; and
a performance target of the acknowledgment/nonacknowledgment signal and the at least one other signal.
17. An apparatus configured for managing wireless communications between a base station and a user equipment, comprising:
means for determining, at the user equipment, resources used to transmit an acknowledgment/nonacknowledgment signal in a channel, wherein the channel carries at least one other signal to the base station;
means for identifying, at the user equipment, a reason to modify the resources, wherein the reason is based, at least in part, on a payload size of an uplink control signal exceeding a threshold, the uplink control signal including at least the acknowledgment/nonacknowledgment signal, wherein the payload size includes a number of bits of the acknowledgment/nonacknowledgment signal;
means, executable in response to said identifying, for modifying the resources according to the identified reason; and
means for transmitting, from the user equipment, the acknowledgment/nonacknowledgment signal with the modified resources and at least one other signal in the channel to the base station.
18. The apparatus of claim 17 , wherein the payload size of the uplink control signal includes a ratio between a payload size of the acknowledgment/nonacknowledgment signal and a payload size of the at least one other signal, wherein the reason is based, at least in part, on the payload size ratio exceeding a threshold.
19. The apparatus of claim 17 , wherein the reason is further based on a higher layer message received from the base station.
20. The apparatus of claim 17 , wherein the user equipment is further configured with two or more component carriers, and the at least one other signal comprises a periodic channel state information feedback signal for at least one of the two or more component carriers.
21. The apparatus of claim 17 , wherein the at least one other signal comprises a periodic channel state information feedback signal for at least one cell of a same carrier frequency.
22. The apparatus of claim 17 , wherein the means for modifying is performed, at least in part, by means for increasing a number of the resources used to transmit an acknowledgment/nonacknowledgment signal to the base station.
23. The apparatus according to claim 22 , wherein the means for increasing the number of the resources used to transmit an acknowledgment/nonacknowledgment signal to the base station comprises:
means for puncturing symbols allocated to other signals.
24. The apparatus according to claim 22 , wherein the means for increasing the number of the resources comprises:
means for puncturing at least one resource on a periodic PUSCH; and
means for puncturing at least one additional resource on the periodic PUSCH.
25. The apparatus of claim 17 , wherein the means for modifying is performed, at least in part, by means for increasing a power of the resources used to transmit the acknowledgment/nonacknowledgment signal to the base station.
26. The apparatus according to claim 25 , wherein the means for increasing the power of the resources used to transmit an acknowledgment/nonacknowledgment signal to the base station comprises:
means for increasing transmit power for the resources.
27. The apparatus according to claim 25 , wherein the means for increasing the power of the resources comprises:
means for puncturing at least one resource on a periodic PUSCH; and
means for power boosting the periodic PUSCH.
28. The apparatus according to claim 27 , wherein the means for power boosting further comprises:
means for power boosting all symbols allocated to the PUSCH.
29. The apparatus according to claim 27 , wherein the means for power boosting further comprises:
means for power boosting the acknowledgment/nonacknowledgment signal allocated to the PUSCH.
30. The apparatus according to claim 27 , wherein the means for power boosting further comprises:
means for power boosting the periodic PUSCH when a threshold is exceeded.
31. The apparatus according to claim 17 , wherein the means for modifying is performed, at least in part, by means for joint coding the acknowledgment/nonacknowledgment signal with the at least one other signal.
32. The apparatus of claim 17 , wherein the reason is further based on one or more of:
a type of the at least one other signal;
a payload size of the at least one other signal; and
a performance target of the acknowledgment/nonacknowledgment signal and the at least one other signal.
33. A user equipment comprising:
at least one processor; and
a memory coupled to the at least one processor,
wherein the at least one processor is configured to:
determine, at the user equipment, resources used to transmit an acknowledgment/nonacknowledgment signal in a channel, wherein the channel carries at least one other signal to a base station;
identify, at the user equipment, a reason to modify the resources, wherein the reason is based, at least in part, on a payload size of an uplink control signal exceeding a threshold, the uplink control signal including at least the acknowledgment/nonacknowledgment signal, wherein the payload size includes a number of bits of the acknowledgment/nonacknowledgment signal;
in response to said identifying, modify the resources according to the identified reason; and
transmit, from the user equipment, the acknowledgment/nonacknowledgment signal with the modified resources and at least one other signal in the channel to the base station.
34. The user equipment of claim 33 , wherein the payload size of the uplink control signal includes a ratio between a payload size of the acknowledgment/nonacknowledgment signal and a payload size of the at least one other signal, wherein the reason is based, at least in part, on the payload size ratio exceeding a threshold.
35. The user equipment of claim 33 , wherein the reason is further based on a higher layer message received from the base station.
36. The user equipment of claim 33 , wherein the user equipment is further configured with two or more component carriers, and the at least one other signal comprises a periodic channel state information feedback signal for at least one of the two or more component carriers.
37. The user equipment of claim 33 , wherein the at least one other signal comprises a periodic channel state information feedback signal for at least one cell of a same carrier frequency.
38. The user equipment of claim 33 , wherein the configuration of the at least one processor to modify is performed, at least in part, by configuration to increase a number of the resources used to transmit an acknowledgment/nonacknowledgment signal to the base station.
39. The user equipment according to claim 38 , wherein configuration of the at least one processor to increase the number of the resources used to transmit an acknowledgment/nonacknowledgment signal to the base station comprises configuration to:
puncture symbols allocated to other signals.
40. The user equipment according to claim 38 , wherein the configuration of the at least one processor to increase the number of the resources comprises configuration to:
puncture at least one resource on a periodic PUSCH; and
puncture at least one additional resource on the periodic PUSCH.
41. The user equipment of claim 33 , wherein the configuration of the at least one processor to modify is performed, at least in part, by configuration to increase a power of the resources used to transmit the acknowledgment/nonacknowledgment signal to the base station.
42. The user equipment according to claim 41 , wherein configuration of the at least one processor to increase the power of the resources used to transmit an acknowledgment/nonacknowledgment signal to the base station comprises configuration to:
increase transmit power for the resources.
43. The user equipment according to claim 41 , wherein the configuration of the at least one processor to increase the power of the resources comprises configuration to:
puncture at least one resource on a periodic PUSCH; and
power boost the periodic PUSCH.
44. The user equipment according to claim 43 , wherein the configuration of the at least one processor to power boost further comprises configuration to:
power boost all symbols allocated to the PUSCH.
45. The user equipment according to claim 43 , wherein the configuration of the at least one processor to power boost further comprises configuration to:
power boost the acknowledgment/nonacknowledgment signal allocated to the PUSCH.
46. The user equipment according to claim 43 , wherein the configuration of the at least one processor to power boost further comprises configuration to:
power boost the periodic PUSCH when a threshold is exceeded.
47. The user equipment according to claim 33 , wherein the configuration of the at least one processor to modify is performed, at least in part, by configuration to joint code the acknowledgment/nonacknowledgment signal with the at least one other signal.
48. The user equipment of claim 33 , wherein the reason is further based on one or more of:
a type of the at least one other signal;
a payload size of the at least one other signal; and
a performance target of the acknowledgment/nonacknowledgment signal and the at least one other signal.
49. A non-transitory computer-readable storage medium comprising:
code for causing a computer to:
determine, at a user equipment, resources used to transmit an acknowledgment/nonacknowledgment signal in a channel, wherein the channel carries at least one other signal to a base station;
identify, at the user equipment, a reason to modify the resources, wherein the reason is based, at least in part, on a payload size of an uplink control signal exceeding a threshold, the uplink control signal including at least the acknowledgment/nonacknowledgment signal, wherein the payload size includes a number of bits of the acknowledgment/nonacknowledgment signal;
in response to said identifying, modify the resources according to the identified reason; and
transmit, from the user equipment, the acknowledgment/nonacknowledgment signal with the modified resources and at least one other signal in the channel to the base station.
50. The non-transitory computer-readable storage medium of claim 49 , wherein the payload size of the uplink control signal includes a ratio between a payload size of the acknowledgment/nonacknowledgment signal and a payload size of the at least one other signal, wherein the reason is based, at least in part, on the payload size ratio exceeding a threshold.
51. The non-transitory computer-readable storage medium of claim 49 , wherein the reason is further based on a higher layer message received from the base station.
52. The non-transitory computer-readable storage medium of claim 49 , wherein the user equipment is further configured with two or more component carriers, and the at least one other signal comprises a periodic channel state information feedback signal for at least one of the two or more component carriers.
53. The non-transitory computer-readable storage medium of claim 49 , wherein the at least one other signal comprises a periodic channel state information feedback signal for at least one cell of a same carrier frequency.
54. The non-transitory computer-readable storage medium of claim 49 , wherein the code for causing a computer to modify is performed, at least in part, by code for causing a computer to increase a number of the resources used to transmit an acknowledgment/nonacknowledgment signal to the base station.
55. The non-transitory computer-readable storage medium of claim 54 , wherein the code for causing a computer to increase the number of the resources used to transmit an acknowledgment/nonacknowledgment signal to the base station comprises code for causing a computer to:
puncture symbols allocated to other signals.
56. The non-transitory computer-readable storage medium of claim 54 , wherein the code for causing a computer to increase the number of the resources comprises code for causing a computer to:
puncture at least one resource on a periodic PUSCH; and
puncture at least one additional resource on the periodic PUSCH.
57. The non-transitory computer-readable storage medium of claim 49 , wherein the code for causing a computer to modify is performed, at least in part, by code for causing a computer to increase a power of the resources used to transmit the acknowledgment/nonacknowledgment signal to the base station.
58. The non-transitory computer-readable storage medium of claim 57 , wherein the code for causing a computer to increase the power of the resources used to transmit an acknowledgment/nonacknowledgment signal to the base station comprises code for causing a computer to:
increase transmit power for the resources.
59. The non-transitory computer-readable storage medium of claim 57 , wherein the code for causing a computer to increase the power of the resources comprises code for causing a computer to:
puncture at least one resource on a periodic PUSCH; and
power boost the periodic PUSCH.
60. The non-transitory computer-readable storage medium of claim 59 , wherein the code for causing a computer to power boost further comprises code for causing a computer to:
power boost all symbols allocated to the PUSCH.
61. The non-transitory computer-readable storage medium of claim 59 , wherein the code for causing a computer to power boost further comprises code for causing a computer to:
power boost the acknowledgment/nonacknowledgment signal allocated to the PUSCH.
62. The non-transitory computer-readable storage medium of claim 59 , wherein the code for causing a computer to power boost further comprises code for causing a computer to:
power boost the periodic PUSCH when a threshold is exceeded.
63. The user equipment according to claim 49 , wherein the code for causing a computer to modify is performed, at least in part, by code for causing a computer to joint code the acknowledgment/nonacknowledgment signal with the at least one other signal.
64. The non-transitory computer-readable storage medium of claim 49 , wherein the reason is further based on one or more of:
a type of the at least one other signal;
a payload size of the at least one other signal; and
a performance target of the acknowledgment/nonacknowledgment signal and the at least one other signal.