Combination Power Headroom Reporting in Multi-Carrier Systems
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Solution Overview
Problem
In multi-component carrier systems, accurately determining combination power headroom (PH) is challenging due to varying power headroom variance across component carriers, which affects dynamic uplink scheduling and battery consumption in wireless communication systems.
Innovation Solution
A method and apparatus for transmitting and receiving combination power headroom information, allowing for dynamic uplink scheduling by configuring and calculating combination power headroom across multiple component carriers, and triggering power headroom reports when the combined power headroom meets a predefined threshold, enabling accurate resource allocation and reduced battery consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple component carriers are dynamically scheduled to increase transmission capacity, then the bandwidth and transmission capacity are improved, but the power headroom variance becomes greater and resource allocation becomes more complex
Solution Approach 1:
The patent combines individual power headroom reports from multiple component carriers into a single combination power headroom report. This merging approach allows the eNodeB to obtain comprehensive power headroom information across all component carriers in one message, simplifying the scheduling decision process while maintaining accurate power management for dynamic resource allocation across multiple carriers.
Solution Approach 2:
The patent introduces a triggering mechanism that determines when combination power headroom reports should be sent based on predefined conditions (such as changes in uplink grants or component carrier configuration). This preliminary determination of reporting timing allows the system to maintain accurate power headroom information without requiring continuous reporting, thereby reducing overhead while ensuring the eNodeB has the necessary information for optimal scheduling.
2Measurement precision
If power headroom information is reported frequently to enable accurate uplink scheduling, then scheduling accuracy is improved, but signaling overhead and battery consumption increase
Solution Approach 1:
The patent implements periodic combination power headroom reporting where the user equipment sends reports at predetermined intervals or when specific triggering conditions are met. This periodic approach ensures that the eNodeB receives accurate power headroom information for optimal scheduling while avoiding continuous reporting that would waste battery power. The reporting frequency is dynamically adjusted based on network conditions and scheduling needs.
Solution Approach 2:
The patent establishes a feedback mechanism where the eNodeB sends uplink grants to the user equipment, and the user equipment responds with combination power headroom reports based on those grants. This feedback loop allows the system to maintain accurate power headroom information only when needed for scheduling decisions, reducing unnecessary reporting and associated energy consumption while ensuring scheduling accuracy when required.
Data Source
AI summary
There are provided an apparatus and method for transmitting information about power headroom in a multi-component carrier system. There is disclosed a method of configuring a plurality of component carriers combined from a candidate component carrier group, based on component carrier configuration information, triggering a power headroom report on the plurality of combined component carriers, calculating power headroom for the plurality of combined component carriers and transmitting combination power headroom information, including a value of the calculated power headroom, to a eNodeB. The power headroom report is triggered, when the power headroom on the plurality of combined component carriers is greater than or equal to a predefined threshold.Accordingly, uplink signaling overhead can be reduced because a power headroom report can be semi-persistently made without the need to additionally send information about the combination component carrier.