Serving Cell Power Headroom Reporting for Dormant BWP States
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Solution Overview
Problem
The existing wireless communication technologies do not effectively handle Power Headroom Reporting (PHR) for serving cells with dormant Bandwidth Parts (BWPs), leading to ambiguity and uncertainty for network nodes regarding power headroom values, especially in scenarios involving dormant and non-dormant BWPs.
Innovation Solution
The proposed solution involves reporting Type 1 and Type 3 power headroom values, along with designated fields indicating whether the serving cell is on a dormant or non-dormant BWP, and triggering PHR events based on BWP switching, ensuring accurate power headroom reporting even when UL transmissions are suspended.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If PHR is reported for dormant BWP, then power management information is provided, but ambiguity in PHR content and triggering events occurs
Solution Approach 1:
The patent introduces a new indicator field (acting as a 'signal color' change) in the PHR that explicitly indicates whether the PH value corresponds to a dormant or non-dormant BWP. This visual/signaling differentiation eliminates ambiguity in PHR content by providing a clear, distinguishable marker for the BWP state, allowing the network to correctly interpret the power headroom information without confusion.
2Measurement precision
If PHR triggering is added for BWP switching events, then accurate power headroom reporting is achieved, but PHR triggering complexity increases
Solution Approach 1:
The patent segments the PHR triggering mechanism into distinct event types: existing triggering events (periodic, event-driven) and a new BWP switching event type. By separating the triggering conditions and associating each with specific BWP state information, the system achieves precise control over when PHR is triggered and what state the PH value represents, without creating a monolithic complex triggering system.
3Reliability
If PH value for dormant BWP is reported, then power management is enhanced, but interpretation ambiguity arises
Solution Approach 1:
The patent introduces an intermediary indicator field that acts as a mediator between the PH value and the network's interpretation. This indicator explicitly carries BWP state information (dormant or non-dormant) alongside the PH value, ensuring that the network can reliably interpret the power headroom information without ambiguity. The intermediary field bridges the gap between the reported PH value and its correct contextual meaning.
Data Source
AI summary
Methods and apparatuses for PHR for a serving cell, wherein an active BWP of the serving cell is a dormant BWP. A UE sends a PHR to at least a network node to report PH of the serving cell; the network node receives the PHR from the UE to report PH of the serving cell and obtains PH value from the PHR for the serving cell. Herein at least one of the following is reported for the serving cell: 1) Type 1 PH; 2) Type 3 PH; 3) a designated field indicating whether the PH is Type 1 or Type 3; 4) a designated field indicating whether the serving cell is on a dormant BWP or non-dormant BWP.