User Equipment Power Headroom Reporting Threshold Mechanism
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Solution Overview
Problem
In LTE and NR systems, User Equipment (UE) faces hardware limitations in processing Power Headroom Reports (PHRs) for multiple carriers, leading to misunderstandings in reported power headroom, affecting network service quality due to overlapping time slots and limited processing capability.
Innovation Solution
A method where the UE determines the time difference between overlapping time slots for different carriers and reports power headroom only if the difference is greater than or equal to a preset threshold, rejecting reports if the difference is less than the threshold to prevent misunderstandings, ensuring accurate power headroom reporting to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE packages power headroom of all uplink carriers with uplink data transmission into one PHR, then the base station can obtain comprehensive power information, but the UE cannot process PHRs of multiple carriers in time due to hardware limitations
Solution Approach 1:
The patent segments the PHR processing by introducing a time threshold parameter. Instead of processing all carrier PHRs simultaneously, the UE divides them into different processing groups based on whether their time slot differences exceed the threshold. This segmentation allows the UE to process PHRs in manageable chunks rather than all at once, resolving the contradiction between information completeness and processing speed.
Solution Approach 2:
The patent applies preliminary action by pre-defining a time threshold parameter before PHR processing begins. This threshold is used to pre-filter which PHRs should be included in the current report, allowing the UE to prepare and process only the relevant subset of PHRs in advance, rather than attempting to process all PHRs simultaneously under tight deadlines.
2Loss of information
If the UE reports power headroom for overlapping time slots, then the base station receives comprehensive power information, but the network and UE misunderstand the reported power headroom
Solution Approach 1:
The patent uses preliminary action by pre-establishing a time threshold criterion before PHR reporting. This threshold serves as a pre-defined rule that automatically determines which PHRs should be included in a report, eliminating ambiguity about whether overlapping time slot PHRs should be reported. Both network and UE follow the same pre-agreed criterion, ensuring consistent understanding.
Solution Approach 2:
The patent implements feedback by having the UE compare the time slot difference against the threshold parameter and make reporting decisions based on this comparison. This feedback mechanism ensures that only PHRs meeting the time separation criterion are reported, preventing the inclusion of potentially conflicting overlapping time slot information and maintaining network-UE understanding consistency.
3Quantity of substance
If the UE processes PHRs of multiple carriers simultaneously, then all power headroom information can be included in one report, but the UE hardware cannot handle the processing load
Solution Approach 1:
The patent segments the set of all PHRs into two groups: those that meet the time threshold criterion and those that don't. This segmentation reduces the quantity of PHRs that need to be processed simultaneously in the current reporting cycle, making the processing load manageable for UE hardware while still including sufficient information for effective base station scheduling decisions.
Solution Approach 2:
The patent applies partial action by selectively including only those PHRs whose time slot differences exceed the threshold, rather than including all possible PHRs. This partial inclusion strategy provides the base station with sufficient power headroom information for effective scheduling while keeping the processing burden within UE hardware capabilities.
Data Source
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AI summary
A power headroom reporting and receiving method, a user terminal, a base station, a medium and a system, the power headroom reporting method comprising: determining a first carrier for sending a power headroom report and a first time slot corresponding thereto; acquiring a second time slot which corresponds to other carriers and is used for receiving transmission permission information; acquiring a third time slot, in which an uplink data transmission exists, corresponding to the other carriers; determining whether a time difference between the second time slot and the first time slot is less than a preset threshold; if the time difference between the second time slot and the first time slot is less than the preset threshold, rejecting to report the power headroom corresponding to the third time slot; and if the time difference between the second time slot and the first time slot is larger than or equal to the preset threshold, reporting the power headroom corresponding to the third time slot. The solution above can be used for accurately reporting the power headroom to the base station, avoiding the misunderstanding of the network side and the UE on the reported power headroom.