Dynamic Uplink Power Allocation for Concurrent Component Carriers
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Solution Overview
Problem
User equipment (UE) in wireless communications systems face challenges in efficiently managing uplink power when configured for carrier aggregation, as maximum transmission power limits (MTPL) are exceeded, leading to throughput degradation and inability to transmit on all component carriers.
Innovation Solution
The UE applies adjustments to the maximum transmission power limit (MTPL) parameters on a per-subframe basis, considering scheduling parameters and discontinuous transmission states, to distribute power across multiple component carriers, ensuring compliance with combined MTPL while allowing transmission on all carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the UE transmits at maximum power on one component carrier, then the transmit power for that carrier is maximized, but the combined transmit power exceeds the maximum transmission power limit and other carriers cannot transmit
Solution Approach 1:
The patent segments the total transmit power allocation by determining individual maximum transmit power limits for each component carrier based on their respective scheduling parameters. This allows power to be distributed across multiple carriers rather than concentrated on one, enabling simultaneous transmission while complying with the overall power limit.
Solution Approach 2:
The patent applies local quality by adjusting the maximum transmit power limit individually for each component carrier based on its specific scheduling parameters (such as modulation and coding scheme, resource block allocation). This ensures each carrier receives appropriate power allocation tailored to its transmission requirements while maintaining overall compliance.
2Ease of operation
If the UE applies a static MTPL adjustment to all component carriers, then power distribution is simplified, but transmission opportunities are lost when some carriers are in DTX state
Solution Approach 1:
The patent implements dynamic power adjustment by determining the maximum transmit power limit for each component carrier on a per-subframe basis according to actual scheduling parameters. When a carrier is in DTX state, its power limit is set to zero, automatically freeing up power for other active carriers without requiring static pre-configuration.
Solution Approach 2:
The system performs self-service by automatically adjusting power allocation based on the actual transmission state of each component carrier. The UE monitors scheduling parameters and dynamically reallocates power without external intervention, ensuring optimal throughput while maintaining compliance with overall power limits.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described for uplink transmit power determination in which a user equipment (UE) may be configured for carrier aggregation of multiple concurrent uplink component carrier (CC) transmissions. The UE may apply an adjustment to a maximum transmit power limit (MTPL) for one or more CCs when the UE is configured for uplink carrier aggregation. The MTPL adjustment may be applied to reduce a transmit power of one of the CCs when a maximum transmit power is requested for the CC. The MTPL adjustment may reduce the transmit power to be less than the MTPL of the UE and thereby provide that one or more other CCs may still have some transmission power. The UE may compute a MTPL adjustment based on a static value or on a per-subframe basis based on scheduling parameters and a requested transmit power for each CC.