Per-Band Uplink Power Control for Carrier Aggregation
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Solution Overview
Problem
Current wireless communication standards restrict user equipment (UE) from exploiting full transmission power during uplink carrier aggregation, limiting network coverage and capacity.
Innovation Solution
Enabling UE to report its capability to operate at full power per band, allowing the network to control uplink power independently for each band, thereby overcoming power class limitations and optimizing power allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If current wireless communication standards are applied, then UE operates within standardized power class limitations, but network coverage and capacity are limited
Solution Approach 1:
The patent segments the total uplink power control into independent per-band power controls. Instead of treating the UE's total power as a single constrained resource, the system divides power allocation by radio band, allowing each band to have its own power class (PC1 or PC2) and power control parameters. This segmentation enables the UE to exploit full transmission power in each band independently, resolving the contradiction between maximizing power and maintaining manageable control complexity.
Solution Approach 2:
The patent introduces dynamic power class selection where the UE can be configured with different power classes (PC1 or PC2) per band based on network conditions and UE capabilities. The network can dynamically adjust which power class applies to which band, allowing flexible adaptation between conservative (PC1) and aggressive (PC2) power modes. This dynamic approach enables the system to maximize power when needed while maintaining control simplicity through standardized configurations.
2Device complexity
If UE is restricted to per-BC power class, then power control is simplified, but UE cannot exploit full power capabilities in each band
Solution Approach 1:
The patent applies local quality by allowing different power class characteristics in different radio bands. Instead of a uniform power class applied across all bands, each band can have its own power class configuration (PC1 or PC2) matched to its specific requirements. This local customization enables the UE to exploit full power capabilities in each band while the network maintains simplified control through standardized per-band configurations, resolving the contradiction between power maximization and control simplicity.
3Power
If UE operates at full power per band, then network coverage and capacity are enhanced, but power allocation complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring power class parameters (PC1 or PC2) for each band before uplink transmission begins. The network device determines and signals the appropriate power class configuration to the UE in advance, based on UE capabilities and network requirements. This preliminary configuration eliminates the need for complex real-time power allocation decisions during scheduling, as the power constraints are already established. The UE can then operate at full power per band within these pre-set boundaries, enhancing coverage and capacity while maintaining scheduling efficiency.
Data Source
AI summary
Various techniques are provided for a method including receiving, at a network device from a user equipment (UE), an indication of a UE capability to support a per-band maximum power for a radio band combination (BC) used by the UE, determining whether the UE supports per-band maximum power for the radio BC based on the indication of the UE capability, and in response to determining the UE supports per-band maximum power for the radio BC, determining a total UE transmission power based on a sum of a maximum power of each band in the radio BC.