Power Headroom Report P-MPR Indicator for Wireless Scheduling
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Solution Overview
Problem
In wireless communication networks, particularly in carrier aggregation scenarios, the existing power headroom reporting mechanisms do not provide sufficient information for proper scheduling, leading to incorrect assumptions about maximum power reduction (MPR) and power backoff, which can result in inefficient resource allocation and potential transmission failures.
Innovation Solution
The proposed solution involves a method for transmitting a power headroom report (PHR) that includes a 2-bit P-MPR info field to differentiate between MPR and P-MPR effects on the maximum UE transmit power, ensuring accurate reporting of P-MPR dominance and reducing unnecessary triggers, thereby enabling the eNodeB to make informed scheduling decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the existing power headroom reporting mechanism is used, then the reporting process is simple, but the eNodeB cannot obtain accurate P-MPR information for proper scheduling
Solution Approach 1:
The power headroom reporting mechanism is segmented into multiple types (Type 1 and Type 2 PHR) with distinct purposes. Type 1 reports provide basic power headroom information, while Type 2 reports provide extended information including P-MPR dominance indicators. This segmentation allows the system to obtain comprehensive P-MPR information without requiring all reports to be complex.
Solution Approach 2:
The patent adds a new dimension to the PHR by introducing a 1-bit indicator field that specifies whether P-MPR dominates MPR. This binary dimension allows the eNodeB to quickly determine the appropriate scheduling approach without requiring complex continuous information, resolving the contradiction between information completeness and reporting simplicity.
2Reliability
If the 1-bit indicator field is added to specify P-MPR dominance, then the eNodeB can make accurate scheduling decisions, but the PHR structure becomes more complex
Solution Approach 1:
Instead of making the entire PHR structure complex, the patent applies local quality by adding only a single 1-bit indicator field within the extended PHR format. This minimal local modification provides the critical P-MPR dominance information needed for reliable scheduling decisions without significantly increasing overall report complexity.
Solution Approach 2:
The patent changes the parameter representation by introducing a binary indicator (0 or 1) that directly encodes the P-MPR dominance state. This parameter change transforms complex power management information into a simple binary flag that the eNodeB can efficiently process for accurate scheduling decisions.
3Measurement precision
If Type 2 PHR with P-MPR information is transmitted frequently, then the eNodeB has up-to-date power headroom information, but the signaling overhead increases
Solution Approach 1:
The patent implements dynamic PHR transmission by allowing the UE to selectively send Type 1 or Type 2 PHR based on current power management conditions. The UE only transmits the more detailed Type 2 PHR with P-MPR information when necessary (when P-MPR dominates or conditions change), reducing signaling overhead while maintaining measurement precision when needed.
Solution Approach 2:
The 1-bit indicator in the Type 2 PHR provides feedback to the eNodeB about P-MPR dominance status. This feedback mechanism allows the eNodeB to understand the current power management state and adjust scheduling decisions accordingly, ensuring accurate power headroom measurement interpretation without requiring continuous detailed reporting.
Data Source
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AI summary
A method, an apparatus, and a computer program product for wireless communication are provided in which a difference between a previous power management maximum power reduction (P-MPR) and a current P-MPR is determined. The previous P-MPR is the P-MPR when an indication is communicated that a power backoff is applied due to the previous P-MPR. A power headroom report (PHR) is triggered when the difference is greater than a threshold and the current P-MPR is greater than a sum of a maximum power reduction (MPR) and an additional MPR (A-MPR). Moreover, an apparatus is provided in which whether and how a P-MPR has changed is indicated in a PHR, and the PHR is transmitted. An apparatus is also provided in which a request is received from an evolved Node B (eNodeB) to report a P-MPR, and a PHR is transmitted including information related to the P-MPR.