Power Headroom Reporting for LTE-Advanced Uplink Scheduling
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Solution Overview
Problem
In LTE-Advanced networks, base stations lack accurate power headroom reports when user equipment sends data on both PUCCH and PUSCH in the same subframe, leading to potential power limited states during resource scheduling.
Innovation Solution
A method for user equipment to report power headroom reports, considering the transmitting power of both PUCCH and PUSCH, allowing base stations to obtain accurate power headroom values for correct resource scheduling, involving triggering conditions, obtaining, and sending power headroom reports within specific transmission time intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station uses prior art power headroom values for radio resource scheduling when PUCCH and PUSCH are transmitted simultaneously, then scheduling decisions can be made, but the user equipment enters power limited state due to inaccurate power headroom information
Solution Approach 1:
The patent changes the power headroom calculation parameters by introducing separate power headroom values for PUCCH (PHR-PUCCH) and PUSCH (PHR-PUSCH) channels, and defines different trigger conditions for reporting each type. This allows the base station to obtain accurate power headroom information specific to each channel type, resolving the inaccuracy that caused power limited states while maintaining efficient resource scheduling.
2Productivity
If the user equipment transmits data on both PUCCH and PUSCH in the same subframe, then uplink communication efficiency is improved, but the base station lacks correct power headroom for reference during resource scheduling
Solution Approach 1:
The patent segments the power headroom reporting into separate reports for PUCCH and PUSCH channels. When both channels are transmitted simultaneously, the user equipment generates and reports distinct power headroom values for each channel type, ensuring that the base station receives complete and accurate power headroom information for both control and data channels, thus preventing information loss.
3Ease of operation
If the base station schedules resources without accurate power headroom reports, then resource allocation can proceed, but excessive resources may be scheduled causing user equipment to enter power limited state
Solution Approach 1:
The patent implements a feedback mechanism where the user equipment continuously monitors its power headroom status and sends periodic or event-triggered power headroom reports to the base station. The reporting is triggered by specific conditions such as power headroom changes exceeding a threshold or scheduling of specific channel types. This feedback loop enables the base station to make accurate resource scheduling decisions based on real-time power headroom information, avoiding both excessive and insufficient resource allocation.
Data Source
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AI summary
The present invention discloses a method for reporting a power headroom report and a user equipment, which are applied in the field of communications. The method includes: triggering reporting of a first power headroom report, and determining that a condition of sending the first power headroom report is satisfied, where the condition of sending the first power headroom report includes: determining that uplink data channel transmission occurs in a current transmission time interval; obtaining the first power headroom report, where the first power headroom report includes a first power headroom value, and the first power headroom value includes a difference between maximum transmitting power of a carrier and a sum of transmitting power of a control channel of the carrier and transmitting power of a data channel of the carrier; and sending the first power headroom report. The present invention solves the problem in the prior art that a base station has no correct power headroom for reference during resource scheduling.