Power Headroom Reporting for Multi-Carrier Uplink
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing power headroom reporting for multiple-access systems, particularly in accurately calculating and transmitting power headroom across independently power-controlled channels like PUCCH and PUSCH, which affects uplink resource allocation and interference reduction.
Innovation Solution
A method and device for calculating and reporting power headroom by identifying transmit powers for concurrently transmitted channels, including virtual transmit powers for control channels when not actively transmitting, and accumulating these to determine available power headroom, which is then communicated to base stations for scheduling adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power headroom is calculated considering all independently power controlled channels including virtual transmit power for control channels, then power management accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent segments the power headroom calculation into separate components for different channel types (PUCCH and PUSCH). It introduces separate indicators to denote whether each channel is actively transmitting or using virtual power, allowing the base station to process power headroom information in a structured, manageable way that improves accuracy without excessive complexity.
Solution Approach 2:
The patent changes the parameter representation by introducing virtual transmit power values for control channels that are not actively transmitting. This allows the system to maintain consistent power headroom calculation across all channels by using a unified parameter approach where inactive channels are represented by their virtual power values rather than being excluded from the calculation.
2Adaptability or versatility
If virtual transmit power is used for control channels not actively transmitting, then power headroom reporting completeness is improved, but information accuracy for active transmission decreases
Solution Approach 1:
The patent introduces virtual transmit power as an intermediary representation for control channels. Instead of directly measuring power for channels that don't transmit (which would be zero and lose information), the system uses virtual power values as a mediator to convey the channel's power characteristics, allowing complete power headroom reporting while maintaining the ability to distinguish between active and inactive channels through separate indicators.
Solution Approach 2:
Rather than reporting zero power for inactive channels (which would suggest no power consumption), the patent inverts the approach by reporting virtual transmit power values that represent the channel's power characteristics as if it were active. This inversion allows the system to maintain complete power headroom information while the base station uses additional indicators to understand which channels are actually transmitting.
3Adaptability or versatility
If separate power control is implemented for PUCCH and PUSCH channels, then power management flexibility is improved, but system complexity increases
Solution Approach 1:
The patent implements separate power control for PUCCH and PUSCH by introducing separate power headroom indicators in the reporting mechanism. Each channel type has its own indicator showing whether it is actively transmitting or using virtual power, allowing independent power management decisions for each channel while maintaining a unified reporting structure that manages system complexity.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products are described for power headroom reporting. A mobile device may identify a transmit power associated with each of a number of independently power controlled channels on one or multiple carriers configured for use by the mobile device. The transmit power may relate to one channel that is an uplink control channel, and one or more additional channels that are uplink shared channels. The identified transmit power of one channel (e.g., the uplink control channel) may be a virtual transmit power, while other identified transmit powers may be measured transmit powers for actual transmissions. The identified transmit powers may be added up, and the power headroom available for the mobile device may be calculated using the accumulated transmit powers. The mobile device may transmit a power headroom report to a base station.