Power Headroom Reporting for Multiple Link Connections
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Solution Overview
Problem
Existing power headroom reporting mechanisms in wireless communications systems are inadequate for supporting multiple link connections, as they fail to efficiently manage power headroom reports across multiple base stations, leading to complexities in calculating and transmitting power headroom values for each carrier in dual or multi-carrier configurations.
Innovation Solution
A method and apparatus for reporting power headroom that involves maintaining multiple groups of power headroom report timers and triggering conditions for each link connection, allowing user equipment to calculate and send independent power headroom reports to each base station, with configurations for periodic and prohibit timers, and downlink pathloss change thresholds, ensuring accurate reporting across multiple carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple link connections are established to multiple base stations, then system capacity and coverage are improved, but power headroom reporting complexity increases significantly
Solution Approach 1:
The patent segments the power headroom reporting system by introducing separate reporting mechanisms for different link types. Type 1 PHR reports are sent to macro base stations while Type 2 PHR reports are sent to small cell base stations. This segmentation allows each base station type to receive tailored power headroom information without requiring all base stations to process all reporting details, thereby reducing overall system complexity while maintaining multi-link connectivity.
2Measurement precision
If independent power headroom reports are calculated for each base station, then reporting accuracy is improved, but calculation overhead and processing time increase
Solution Approach 1:
The patent applies local quality by differentiating the power headroom reporting requirements for different base station types. Type 1 PHR (for macro base stations) and Type 2 PHR (for small cell base stations) have different calculation methods and reporting formats optimized for their specific characteristics. This allows each base station to receive power headroom information tailored to its local requirements, improving accuracy while avoiding the inefficiency of calculating identical reports for all base stations.
3Reliability
If multiple groups of timers and triggering conditions are maintained for multiple link connections, then reporting reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the timer and triggering condition management by associating specific timer groups with specific PHR types. First group timers control Type 1 PHR reporting to macro base stations, while second group timers control Type 2 PHR reporting to small cell base stations. This segmentation allows the user equipment to maintain multiple sets of reporting parameters without creating a monolithic complex system, as each segment can be managed independently according to its specific requirements.
Data Source
AI summary
Embodiments of the present invention provide a method for reporting power headroom in support of multiple link connections. The method comprises: receiving, by a user equipment, one or more configured power headroom report parameters from at least one of multiple base stations to which the multiple link connections are connected; maintaining, at the user equipment, multiple groups of power headroom report timers respectively corresponding to the multiple link connections and maintaining multiple groups of triggering conditions for reporting power headroom respectively corresponding to the multiple link connections, wherein a number of groups of the multiple groups of the power headroom report timers and the number of groups of the multiple groups of triggering conditions for reporting the power headroom are identical to the number of connections of the multiple link connections respectively; if at least one triggering condition of one group of the triggering conditions for reporting the power headroom is met with respect to a corresponding base station of the multiple base stations, then calculating the power headroom for the corresponding base station and generating a power headroom report; and sending the power headroom report to the corresponding base station.