IAB Node PHR Mapping With Adjusted Power Headroom Ranges
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Solution Overview
Problem
Existing PHR tables are insufficient to support the higher transmission power class and beamforming gain requirements of IAB-Ns, as they do not account for the increased power capabilities and beamforming gains of IAB-Ns compared to UEs.
Innovation Solution
A method at a downstream radio node to determine a mapping table with adjusted measurement value ranges for PHR parameters, including PH and maximum transmit power, and transmit a reported entry index to an upstream node using extended PHR MAC CE fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing PHR tables are used for IAB-Ns, then compatibility with UE PHR mechanisms is maintained, but the power headroom reporting accuracy is insufficient due to lower transmission power class and beamforming gain capabilities
Solution Approach 1:
The patent modifies the PHR measurement value ranges by introducing adjustment values (offsets) that change the parameter scaling according to the node type. For IAB-Ns, the measurement values are adjusted by adding offset values (e.g., +3dB to +6dB) to account for higher transmission power capabilities and beamforming gains, while maintaining the same PHR message structure for compatibility.
Solution Approach 2:
The patent applies different PHR reporting characteristics to different node types (UE vs. IAB-N) by selectively applying adjustment values based on the node identifier. The PHR mechanism maintains local optimization for each node type while keeping the overall system structure unified, allowing IAB-Ns to report accurate power headroom values suited to their higher power class.
2Measurement precision
If PHR measurement value ranges are extended to support higher transmission power, then IAB-N power headroom reporting accuracy is improved, but the PHR message format complexity increases
Solution Approach 1:
Instead of changing the fundamental PHR message structure, the patent modifies only the measurement value ranges by applying numerical offsets. The same PHR MAC CE format and entry index mapping are used for both UEs and IAB-Ns, but the measurement values for IAB-Ns are adjusted by adding offset values, thereby extending the effective range without increasing format complexity.
Solution Approach 2:
The patent introduces adjustment values (offsets) as intermediary elements that bridge the gap between UE PHR mechanisms and IAB-N requirements. These offsets act as mediators that transform the measurement values to match the higher power class capabilities while keeping the PHR message structure unchanged, thus avoiding direct complexity increases in the message format.
3Ease of manufacture
If IAB-Ns use standard UE PHR mechanisms, then implementation simplicity is maintained, but the beamforming gain and transmission power capabilities are not adequately reflected
Solution Approach 1:
The patent maintains implementation simplicity by keeping the PHR message structure and processing logic unchanged for IAB-Ns. The only modification is the application of adjustment values (offsets) to the measurement values, which allows IAB-Ns to accurately report power headroom values that reflect their higher transmission power capabilities and beamforming gains without requiring complex new mechanisms.
Data Source
AI summary
The present disclosure provides a method at a downstream radio node. The method includes: determining a mapping table, which indicates a mapping correspondence between an entry index of a PHR related parameter and a measurement value range of the PHR related parameter with an adjustment value being applied; and transmitting an reported entry index according to the mapping table and a corresponding measurement value to an upstream radio node. The present disclosure further provides a method at an upstream radio node, a downstream radio node, an upstream radio node and a computer readable storage medium.