UE Power Headroom Reporting Configuration Based on Power Class
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Solution Overview
Problem
Low complexity and low cost UEs, such as those used in machine-type communication, have limited reporting capabilities compared to legacy UEs, leading to less accurate scheduling decisions by network nodes due to restricted power headroom reporting resolution, which does not reflect the actual power class of UEs with lower transmitting powers.
Innovation Solution
A method for determining a reporting configuration based on the UE's power class to report power headroom, where each reportable value corresponds to a range of power headroom values, allowing for more accurate reflection of the available power, enabling better resource allocation and scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed reporting configuration is used for all UEs, then device complexity is reduced and ease of operation is improved, but measurement precision deteriorates because the reporting resolution does not reflect the actual power class of low complexity UEs
Solution Approach 1:
The patent applies parameter changes by making the reporting configuration dependent on the UE's power class. Different power classes (e.g., power class 3 with 23 dBm, power class 5 with 20 dBm, and new power class with 14 dBm) are associated with different reporting resolutions. This allows the reporting resolution to adapt to the actual transmitting power capability of each UE, improving measurement precision without requiring a completely new configuration system.
Solution Approach 2:
The patent introduces dynamics by enabling the reporting configuration to change based on the UE's power class. Instead of a static configuration, the system dynamically selects the appropriate reporting resolution according to the UE's power class, allowing low complexity UEs to report with higher resolution when needed while maintaining simplicity for other UEs.
2Measurement precision
If reporting resolution is increased to reflect actual power class, then measurement precision is improved, but device complexity increases due to multiple reporting configurations
Solution Approach 1:
The patent changes the reporting resolution parameter based on the UE's power class. Low complexity UEs with lower transmitting power (e.g., 14 dBm) are configured with higher reporting resolution to accurately reflect their power headroom, while legacy UEs use standard resolution. This ensures scheduling decisions are based on accurate power information for each UE type.
Solution Approach 2:
The patent applies local quality by providing different reporting resolutions tailored to specific UE power classes. Each UE receives a reporting configuration appropriate to its power capabilities, ensuring that low complexity UEs get the enhanced resolution they need while other UEs continue to use standard configurations, optimizing overall system performance.
3Reliability
If coverage enhancement techniques are applied to low complexity UEs, then reliability is improved for remote locations, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent changes the reporting parameters (resolution and ranges) based on the UE's power class and coverage conditions. Low complexity UEs in coverage enhancement mode report power headroom with higher resolution and different value ranges that reflect their lower transmitting power and enhanced coverage operation, allowing the network to make accurate scheduling decisions without requiring complex UE processing.
Data Source
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Figure 4a~4b
AI summary
Method performed by a base station (111). The base station (111) determines (203) a reporting configuration for a UE (130) to report power headroom to the base station (111). The determining (203) is based on a power class of the UE (130). The reporting configuration comprises a plurality of reportable values. Each reportable value corresponds to a respective range of values of a power headroom. The respective range each reportable value corresponds to is a function of a power class of the UE (130). The base station (111) receives (204), from the UE (130), a reportable value from the plurality of reportable values. The respective range of values of the power headroom indicated by the received reportable value is based on the determined reporting configuration. A method performed by the UE (130) is also disclosed. The UE (130) obtains (302) the reporting configuration, and transmits (304), to the base station (111), the reportable value.