Method, system, and device for power headroom reporting and sub-frame scheduling
View Patent ↗Embodiments relate to the field of wireless communications, and particularly, to methods and apparatuses for power headroom reporting. In one embodiment, a method of power headroom reporting includes: determining PH information of each of configured and active cells at a current instant if PH information is required to be reported, where the configured and active cells include a cell which is configured with a downlink subframe at the current instant; and reporting the determined PH information. Since a power headroom is reported by obtaining PH information of a configured and active cell which is currently a downlink subframe according to a virtual transmission format, the PH information facilitates subsequent scheduling by an eNB.
1. A method of power headroom reporting, wherein the method comprises:
determining Power Headroom (PH) information of each of configured and active cells at a current instant if PH information is required to be reported, wherein the configured and active cells are aggregated with different Time Division Duplex (TDD) Uplink/Downlink (UL/DL) configurations for a user equipment (UE), and the configured and active cells comprise a cell which is configured with a downlink subframe at the current instant; and
reporting the determined PH information which comprise the PH information of the configured and active cell which is configured with a downlink subframe at the current instant; wherein determining PH information of each of configured and active cells at a current instant comprises:
for the cell which is configured with a downlink subframe at the current instant, virtualizing the downlink subframe by calculating the PH information of the cell according to a virtual Physical Uplink Control Channel (PUCCH) transmission format.
2. The method according to claim 1 , wherein reporting the determined PH information comprises:
placing all the determined PH information into a Power Headroom Reporting Media Access Control Control Element (PHR MAC CE), and transmitting the PHR MAC CE in an uplink subframe.
3. The method according to claim 1 , wherein before determining the PH information of the cell, the method further comprises:
determining maximum configurable carrier transmission power of the cell; and
after determining the maximum configurable carrier transmission power of the cell, the method further comprises:
reporting the maximum configurable carrier transmission power of the cell.
4. The method according to claim 3 , wherein determining maximum configurable carrier transmission power of the cell comprises:
if the cell is a primary cell, then determining maximum configurable carrier transmission power to calculate PH information of Type 1 and maximum configurable carrier transmission power to calculate PH information of Type 2; or
if the cell is a secondary cell, then determining maximum configurable carrier transmission power to calculate PH information of Type 1.
5. The method according to claim 3 , wherein reporting the maximum configurable carrier transmission power of the cell comprises:
placing the maximum configurable carrier transmission power of the cell into a PHR MAC CE and transmitting the PHR MAC CE in an uplink subframe.
6. The method according to claim 1 , wherein after determining the PH information and before reporting the determined PH information, the method further comprises:
sorting the PH information of the configured and active cells in a PHR MAC CE in an ascending or descending order of cell indexes.
7. A method of subframe scheduling, wherein the method comprises:
receiving PH information, reported from a user equipment, of each of configured and active cells at a current instant, wherein the configured and active cells are aggregated with different Time Division Duplex (TDD) Uplink/Downlink (UL/DL) configurations for a user equipment (UE), and the configured and active cells comprise a cell which is configured with a downlink subframe at the current instant, wherein the received PH comprises the PH information of the configured and active cell which is configured with a downlink subframe at the current instant; and
scheduling a subsequent uplink subframe according to the received PH information;
wherein for the cell which is configured with a downlink subframe at the current instant, virtualizing the downlink subframe by calculating the PH information of the cell according to a virtual Physical Uplink Control Channel (PUCCH) transmission format.
8. The method according to claim 7 , wherein receiving PH information comprises:
extracting the PH information from a PHR MAC CE.
9. The method according to claim 7 , wherein the method further comprises:
extracting, from a PHR MAC CE, maximum configurable carrier transmission power for each of the configured and active cells.
10. An apparatus for power headroom reporting, wherein the apparatus comprises:
a PH information determining module, configured to determine PH information of each of configured and active cells at a current instant if PH information is required to be reported, wherein the configured and active cells are aggregated with different Time Division Duplex (TDD) Uplink/Downlink (UL/DL) configurations for a user equipment (UE), and the configured and active cells comprise a cell which is configured with a downlink subframe at the current instant; and
a reporting module configured to report the determined PH information which comprise the PH information of the configured and active cell which is configured with a downlink subframe at the current instant;
wherein the PH information determining module is further configured:
for the cell which is configured with a downlink subframe at the current instant, virtualizing the downlink subframe by calculating the PH information of the cell according to a virtual Physical Uplink Control Channel (PUCCH) transmission format.
11. The apparatus according to claim 10 , wherein the reporting module is further configured:
to place all the determined PH information into a PHR MAC CE and to transmit the PHR MAC CE in an uplink subframe.
12. The apparatus according to claim 10 , wherein the PH information determining module is further configured:
to determine maximum configurable carrier transmission power of the cell before determining the PH information of the cell;
the reporting module is further configured:
to report the maximum configurable carrier transmission power of the cell.
13. The apparatus according to claim 12 , wherein the PH information determining module is further configured:
if the cell is a primary cell, to determine maximum configurable carrier transmission power to calculate PH information of Type 1 and maximum configurable carrier transmission power to calculate PH information of Type 2; or if the cell is a secondary cell, to determine maximum configurable carrier transmission power to calculate PH information of Type 1.
14. The apparatus according to claim 12 , wherein the reporting module is further configured:
to place the maximum configurable carrier transmission power of the cell in a PHR MAC CE and to transmit the PHR MAC CE in an uplink subframe.
15. The apparatus according to claim 10 , wherein the reporting module is further configured:
to sort the PH information of the configured and active cells in a PHR MAC CE according to cell index before reporting the determined PH information.