Abstract
A method for reporting power headroom is disclosed. Power headroom may be reported across all carriers (wideband), for a specific carrier, or for a carrier group. The formula used to calculate the power headroom depends on whether the carrier (or a carrier in the carrier group) has a valid uplink grant. If the carrier or carrier group does not have a valid uplink grant, the power headroom may be calculated based on a reference grant. The power headroom is calculated by a wireless transmit/receive unit and is reported to an eNodeB.
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Technologies
Product
Use Cases
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Claim
1. A wireless transmit/receive unit (WTRU), the WTRU comprising:
a processor configured to:
determine a first carrier that does not have a physical uplink shared channel (PUSCH) transmission for a transmission occasion;
determine a maximum power for the first carrier;
calculate a power headroom for the first carrier using the maximum power for the first carrier and transmit power information determined based on a reference grant; and
send a power headroom report, the power headroom report being sent on a PUSCH of a second carrier and comprising an indication of the power headroom for the first carrier.
2. The WTRU of claim 1, wherein the reference grant is used for the power headroom calculation for the first carrier based on the first carrier not having the PUSCH transmission for the transmission occasion.
3. The WTRU of claim 2, wherein the indication of the power headroom for the first carrier is a first indication and wherein the power headroom report comprises a second indication of a power headroom for the second carrier.
4. The WTRU of claim 3, wherein the power headroom for the second carrier is determined based on a power of a PUSCH transmission set for the second carrier.
5. The WTRU of claim 1, wherein the transmission occasion comprises a subframe.
6. The WTRU of claim 1, wherein the reference grant is based on a reference format.
7. The WTRU of claim 6, wherein the reference format is a downlink control information (DCI) format.
8. The WTRU of claim 1, wherein the power headroom report is a type 1 power headroom report.
9. The WTRU of claim 1, wherein the reference grant is related to a pre-defined allocation.
10. The WTRU of claim 1, wherein the reference grant is related to a pre-defined number of resource blocks.
11. A method for calculating a power headroom via a wireless transmit/receive unit (WTRU), the method comprising:
determining a first carrier that does not have a physical uplink shared channel (PUSCH) transmission for a transmission occasion;
determining a maximum power for the first carrier;
calculating a power headroom for the first carrier using the maximum power for the first carrier and transmit power information determined based on a reference grant; and
sending a power headroom report, the power headroom report being sent on a PUSCH of a second carrier and comprising an indication of the power headroom for the first carrier.
12. The method of claim 11, wherein the reference grant is used for the power headroom calculation for the first carrier based on the first carrier not having the PUSCH transmission for the transmission occasion.
13. The method of claim 12, wherein the indication of the power headroom for the first carrier is a first indication and wherein the power headroom report comprises a second indication of a power headroom for the second carrier.
14. The method of claim 13, wherein the power headroom for the second carrier is determined based on a power of a PUSCH transmission set for the second carrier.
15. The method of claim 11, wherein the transmission occasion comprises a subframe.
16. The method of claim 11, wherein the reference grant is based on a reference format.
17. The method of claim 16, wherein the reference format is a downlink control information (DCI) format.
18. The method of claim 11, wherein the power headroom report is a type 1 power headroom report.
19. The method of claim 11, wherein the reference grant is related to a pre-defined allocation.
20. The method of claim 11, wherein the reference grant is related to a pre-defined number of resource blocks.
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.