Power headroom reporting for multicarrier LTE systems
A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus maintains at least one PHR trigger for triggering communication of a PHR for a plurality of component carriers. In addition, the apparatus communicates the PHR for at least one of the component carriers upon the at least one PHR trigger being triggered. The communicated PHR may be an aggregated PHR that includes power headroom information on the PCC and activated SCCs. The communicated PHR may further include an index associating information in the PHR to a corresponding component carrier. The communicated PHR may further include information indicating use of a PUSCH reference for computing the PHR for the at least one of the component carriers on which there is no PUSCH transmission.
1. A method of wireless communication, comprising:
maintaining at least one power headroom report (PHR) trigger for triggering communication of a PHR for a plurality of component carriers; and
communicating the PHR for at least one of the component carriers upon the at least one PHR trigger being triggered,
wherein the communicated PHR includes, for said at least one of the component carriers on which there is no physical uplink shared channel (PUSCH) transmission, at least one bit indicating whether the PHR is computed based on a PUSCH reference or a real PUSCH transmission.
2. The method of claim 1 , wherein said at least one of the component carriers comprises activated component carriers and the communicating comprises communicating the PHR aggregately for all the activated component carriers upon one of said at least one PHR trigger being triggered.
3. The method of claim 1 , wherein said at least one of the component carriers includes a primary component carrier (PCC) such that the communicated PHR includes power headroom information for the PCC.
4. The method of claim 1 , wherein the communicated PHR includes, for said at least one of the component carriers that is a secondary component carrier, an index associating information in the PHR to a corresponding component carrier.
5. The method of claim 1 , wherein said maintaining the at least one PHR trigger for triggering communication of a PHR is done for each of the plurality of component carriers.
6. An apparatus for wireless communication, comprising:
means for maintaining at least one power headroom report (PHR) trigger for triggering communication of a PHR for a plurality of component carriers; and
means for communicating the PHR for at least one of the component carriers upon the at least one PHR trigger being triggered,
wherein the communicated PHR includes, for said at least one of the component carriers on which there is no physical uplink shared channel (PUSCH) transmission, at least one bit indicating whether the PHR is computed based on a PUSCH reference or a real PUSCH transmission.
7. The apparatus of claim 6 , wherein said at least one of the component carriers comprises activated component carriers and the means for communicating communicates the PHR aggregately for all the activated component carriers upon one of said at least one PHR trigger being triggered.
8. The apparatus of claim 6 , wherein said at least one of the component carriers includes a primary component carrier (PCC) such that the communicated PHR includes power headroom information for the PCC.
9. The apparatus of claim 6 , wherein the communicated PHR includes, for said at least one of the component carriers that is a secondary component carrier, an index associating information in the PHR to a corresponding component carrier.
10. The apparatus of claim 6 , wherein said means for maintaining the at least one PHR trigger for triggering communication of a PHR is done for each of the plurality of component carriers.
11. An apparatus for wireless communication, comprising:
a memory; and
at least one processor operably connected to said memory, wherein said at least one processor is configured to:
maintain at least one power headroom report (PHR) trigger for triggering communication of a PHR for a plurality of component carriers; and
communicate the PHR for at least one of the component carriers upon the at least one PHR trigger being triggered,
wherein the communicated PHR includes, for said at least one of the component carriers on which there is no physical uplink shared channel (PUSCH) transmission, at least one bit indicating whether the PHR is computed based on a PUSCH reference or a real PUSCH transmission.
12. The apparatus of claim 11 , wherein said at least one of the component carriers comprises activated component carriers and the processing system is configured to communicate the PHR aggregately for all the activated component carriers upon one of said at least one PHR trigger being triggered.
13. The apparatus of claim 11 , wherein said at least one of the component carriers includes a primary component carrier (PCC) such that the communicated PHR includes power headroom information for the PCC.
14. The apparatus of claim 11 , wherein the communicated PHR includes, for said at least one of the component carriers that is a secondary component carrier, an index associating information in the PHR to a corresponding component carrier.
15. The apparatus of claim 11 , wherein said at least one processor is configured to maintain said at least one PHR trigger for triggering communication of a PHR for each of the plurality of component carriers.
16. A computer program product, comprising:
a non-transitory computer-readable medium comprising code for:
maintaining at least one power headroom report (PHR) trigger for triggering communication of a PHR for a plurality of component carriers; and
communicating the PHR for at least one of the component carriers upon the at least one PHR trigger being triggered,
wherein the communicated PHR includes, for said at least one of the component carriers on which there is no physical uplink shared channel (PUSCH) transmission, at least one bit indicating whether the PHR is computed based on a PUSCH reference or a real PUSCH transmission.
17. The computer program product of claim 16 , wherein said at least one of the component carriers comprises activated component carriers and the code for communicating communicates the PHR aggregately for all the activated component carriers upon one of said at least one PHR trigger being triggered.
18. The computer program product of claim 16 , wherein said at least one of the component carriers includes a primary component carrier (PCC) such that the communicated PHR includes power headroom information for the PCC.
19. The computer program product of claim 16 , wherein the communicated PHR includes, for said at least one of the component carriers that is a secondary component carrier, an index associating information in the PHR to a corresponding component carrier.
20. The computer program product of claim 16 , wherein said maintaining the at least one PHR trigger for triggering communication of a PHR is done for each of the plurality of component carriers.