Power Headroom Reporting for Carrier Aggregation
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Solution Overview
Problem
In LTE-A systems, there is a lack of a corresponding power headroom reporting solution when user equipment supports the transmission of Physical Uplink Control Channels (PUCCHs) on different uplink carriers corresponding to different sets of carriers, which hinders efficient uplink transmission scheduling.
Innovation Solution
A method and device for reporting power headrooms under carrier aggregation, where user equipment generates and reports Type 1 and Type 2 power headrooms for each uplink carrier, grouping downlink carriers into sets and determining linked uplink carriers for PUCCH transmission based on network signaling, using specific equations to calculate power headrooms based on uplink transmission information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power headroom reporting is not implemented for multiple uplink carriers with PUCCH transmission, then device complexity is reduced, but uplink transmission scheduling efficiency deteriorates
Solution Approach 1:
The patent segments power headroom reporting by defining two distinct types: Type 1 PH for PUSCH transmission scenarios and Type 2 PH for PUCCH transmission scenarios. This segmentation allows the system to report power headroom information specifically tailored to different transmission modes, improving scheduling efficiency without overwhelming the system with unnecessary reporting complexity.
Solution Approach 2:
The patent implements dynamic power headroom reporting where the UE selectively reports Type 1 or Type 2 PH based on the actual transmission scenario. The reporting is triggered dynamically when power headroom information becomes relevant for scheduling decisions, allowing the system to adapt to varying transmission conditions while maintaining manageable reporting complexity.
2Productivity
If power headroom reporting is implemented for all uplink carriers, then uplink transmission scheduling efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by making power headroom reporting specific to the transmission scenario. Type 1 PH is used when PUSCH is transmitted, while Type 2 PH is used when PUCCH is transmitted. This scenario-specific approach ensures that power headroom information is provided with the appropriate granularity and detail for each local transmission context, improving scheduling efficiency while avoiding unnecessary signaling overhead from universal reporting.
3Productivity
If accurate power headroom reporting is implemented, then resource allocation efficiency is improved, but calculation complexity increases
Solution Approach 1:
The patent segments the power headroom calculation into two distinct methodologies corresponding to Type 1 and Type 2 PH. Type 1 PH calculation focuses on PUSCH transmission parameters, while Type 2 PH calculation incorporates PUCCH transmission parameters. This segmentation simplifies the calculation process by breaking it down into scenario-specific computations rather than requiring a single complex universal calculation.
Solution Approach 2:
The patent performs preliminary classification of the transmission scenario to determine whether Type 1 or Type 2 PH should be reported. By pre-identifying the transmission mode (PUSCH-only, PUCCH-only, or both), the system can select the appropriate calculation methodology in advance, avoiding the need for complex real-time decision-making during the power headroom calculation process.
Data Source
AI summary
The present application relates to the field of wireless communications. Disclosed in an embodiment of the present application are a method and device for reporting power headroom (PH) under carrier aggregation, for solving the problem of how to report PH when a terminal supports the transmission of a physical uplink control channel (PUCCH) on different uplink carriers corresponding to different carrier groups. In the present application, a terminal generates a Type 1 PH and a Type 2 PH for each of multiple PUCCH-transmitting uplink carriers requiring PH reporting, generates a Type 1 PH for each non-PUCCH-transmitting uplink carrier requiring PH reporting, and reports each generated Type 1 PH and Type 2 PH to a network side in the current uplink subframe. The present application solves the above problem.