Power headroom reporting with channel selection
View Patent ↗Systems, apparatus, user equipment (UE), evolved node B (eNB), and methods are described for generating an extended power headroom report (ePHR) based on an uncertainty associated with a physical downlink control channel communication granting an uplink grant for a physical uplink shared channel communication when the system is configured for simultaneous physical uplink shared channel and physical uplink control channel communications. Some embodiments are structured to generate the ePHR using a type 2 report regardless of the uncertainty associated with the ePHR, while other embodiments generate the ePHR using a reference format. In some embodiments, a UE communicates a timing field with a UE capability communication indicating whether the UE meets timing requirements to avoid uncertainty in ePHR communications.
1. An apparatus of a user equipment (UE), the apparatus comprising:
a memory configured to store a power headroom report; and
control circuitry configured to:
encode simultaneous physical uplink shared channel (PUSCH) and physical uplink control channel (PUCCH) communications;
detect a first physical downlink control channel (PDCCH) transmission comprising a first uplink grant associated with a first PUSCH transmission, wherein the first PUSCH transmission is associated with the power headroom report;
detect whether the UE is able to determine if a first PUCCH transmission is simultaneously scheduled with the first PUSCH transmission;
generate the power headroom report as a first power headroom report based on an expected transmission if the UE is able to determine that the first PUCCH transmission is simultaneously scheduled with the first PDCCH;
generate the power headroom report as a second power headroom report that reserves power overhead for the first PUCCH transmission and is different from the first power headroom report if the UE is not able to determine if the first PUCCH transmission is simultaneously scheduled with the first PUSCH transmission, wherein the second power headroom report is generated using:
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encode the first PUSCH transmission with the power headroom report for communication to an evolved node B (eNB).
2. The apparatus of claim 1 wherein the apparatus further comprises media access control (MAC) circuitry, wherein the MAC circuitry is configured to not reserve space for octet 2 of the power headroom report as part of the generation of the power headroom report when the UE is not able to determine if the first PDCCH transmission is simultaneously scheduled with the first PUSCH transmission.
3. The apparatus of claim 2 wherein the power headroom report comprises an extended power headroom report (ePHR); and
wherein the circuitry is further configured to set a V=1 value in octet 1 of the ePHR as part of the generation of the ePHR when the LIE is not able to determine if the first PDCCH transmission is simultaneously scheduled with the first PUSCH transmission.
4. The apparatus of claim 3 wherein the circuitry is further configured to calculate a reference type 2 report for a reference PUCCH transmission in place of the first PUCCH transmission for use in the ePHR.
5. The apparatus of claim 1 , wherein the power headroom report comprises an extended power headroom report (ePHR), and
wherein the circuitry comprises media access control (MAC) circuitry, wherein the MAC circuitry is configured to reserve space for octet 2 of the ePHR as part of the generation of the ePHR when the first PDCCH transmission is simultaneously scheduled with the first PUSCH transmission.
6. The apparatus of claim 5 wherein the circuitry is further configured to clear the V in octet 1 of the ePHR as part of the generation of the ePHR when the first PDCCH transmission is simultaneously scheduled with the first PUSCH transmission.
7. The apparatus of claim 6 wherein the circuitry is further configured to calculate the ePHR based on a PUCCH transmission associated with a fixed PUCCH resource from a set of possible PUCCH format 1b with channel selection resources.
8. The apparatus of claim 7 wherein the fixed PUCCH resource is resource 0.
9. The apparatus of claim 7 wherein the fixed PUCCH resource is set based on a subframe of the PUCCH transmission associated with the fixed PUCCH resource.
10. The apparatus of claim 9 wherein the ePHR is based on the first PUCCH transmission.
11. The apparatus of claim 10 wherein the circuitry is further configured to transmit a UE capability communication comprising a timing field having a first value that identifies the UE as failing to meet a set of timing requirements;
wherein the UE detects whether the UE is able to determine if a first PUCCH transmission is simultaneously scheduled with the first PUSCH transmission based on the first value.
12. The apparatus of claim 11 wherein the circuitry is further configured to:
adjust the first value to a second value that identifies the UE as meeting the set of timing requirements based on a change in UE operation after generation of the ePHR; and
generate a second extended power headroom report (ePHR) based on the second value.
13. The apparatus of claim 1 wherein the PUCCH communications comprise format 1b transmissions with channel selection; and
wherein the power headroom report comprises a type 2 report.
14. The apparatus of claim 1 wherein the processing circuitry is further configured to:
decode a first physical downlink shared channel (PDSCH) transmission; and
pack the first PUSCH transmission;
wherein decoding of the first PUSCH transmission is completed later than packing of the first PUSCH transmission, such that the UE is not able to determine if the first PUCCH transmission is simultaneously scheduled with the first PUSCH transmission.
15. The apparatus of claim 1 further comprising:
receive circuitry configured to receive the first PDCCH transmission from the eNB via an air gap and to communicate the first PDCCH transmission to the processing circuitry; and
transmit circuitry configured to transmit the PUSCH using a first carrier frequency and to transmit the PUCCH using a second carrier frequency as part of the system with carrier aggregation.
16. A non-transitory computer readable medium comprising instructions that, when executed by one or more processors, configure a user equipment (UE) to:
encode physical uplink shared channel (PUSCH) communications on a first carrier frequency simultaneous with physical uplink control channel (PUCCH) communications on a second carrier frequency, the PUCCH communications comprising a first PUCCH transmission;
detect a first physical downlink control channel (PDCCH) transmission comprising a first uplink grant associated with a first PUSCH transmission, wherein the first PUSCH transmission is associated with a power headroom report;
detect whether the HE is able to determine if the first PUCCH transmission is simultaneously scheduled with the first PUSCH transmission;
generate the power headroom report based on as a first power headroom report based on expected transmissions if the UE is able to determine if the first PUCCH transmission is simultaneously scheduled with the first PUSCH transmission;
generate the power headroom report as a second power headroom report that reserves power overhead for the first PUCCH transmission and is different from the first power headroom report if the UE is not able to determine if the first PUCCH transmission is simultaneously scheduled with the first PUSCH transmission, wherein the second power headroom report is generated using:
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encode the first PUSCH transmission with the power headroom reporta.
17. The non-transitory computer readable medium of claim 16 wherein the power headroom report comprises a type 2 report; and
wherein the PUCCH communications comprise format 1b transmissions with channel selection.
18. The non-transitory computer readable medium of claim 16 wherein the instructions further configure the UE to:
decode a first physical downlink shared channel (PUSCH) transmission; and
pack the first PUSCH transmission;
wherein decoding of the first PUSCH transmission is completed later than packing of the first PUSCH transmission, such that the UE detects that the UE is unable to determine if the first PUCCH transmission is simultaneously scheduled with the first PUSCH transmission based on detecting that decoding of the first PDSCH transmission is complete later than the packing of the first PUSCH transmission.