UE Power Sharing in Dual Connectivity SBFD Overlap
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in optimizing power sharing mechanisms between Master Cell Groups (MCG) and Secondary Cell Groups (SCG) due to overlapping resources and asynchronous TDD patterns, which affect transmission power determination and efficiency.
Innovation Solution
The proposed solution involves a user equipment (UE) that determines the transmission power of uplink resources based on the maximum available transmission power associated with each cell group, taking into account overlapping SBFD resources and asynchronous TDD patterns. The UE receives maximum transmission power values from the base station through RRC messages and calculates transmission power for uplink resources in SCG and MCG, ensuring efficient power sharing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE uses separate maximum transmission power values for MCG and SCG, then power allocation can be optimized for each cell group, but the overall power management becomes complex when resources overlap in time domain
Solution Approach 1:
The patent segments the total transmission power into separate maximum transmission power values for MCG (P_MCG,max) and SCG (P_SCG,max). This segmentation allows independent power allocation optimization for each cell group while maintaining manageable complexity through clear separation of power control domains.
Solution Approach 2:
The patent implements dynamic power sharing where the actual transmission power for each cell group is adjusted based on resource overlap conditions in the time domain. When SBFD resources in one cell group overlap with resources in another cell group, the power allocation dynamically adapts to ensure efficient utilization of the total available power P_max.
2Reliability
If the UE determines transmission power based on SCG maximum power when SBFD resources overlap, then uplink transmission in SCG is protected, but the overall power utilization may be suboptimal
Solution Approach 1:
The patent changes the parameter used for transmission power determination based on resource overlap conditions. When SBFD resources overlap with uplink resources in another cell group, the UE uses the specific cell group's maximum power (P_MCG,max or P_SCG,max) instead of the total P_max, ensuring reliable transmission while adapting to the overlapping resource scenario.
3Adaptability or versatility
If asynchronous TDD patterns are used in MCG and SCG, then flexibility in resource allocation is improved, but determining non-overlapping uplink resources becomes more difficult
Solution Approach 1:
The patent performs preliminary identification of non-overlapping uplink resources by comparing the asynchronous TDD patterns of MCG and SCG. The UE determines time resources where uplink transmissions in one cell group do not overlap with any resources (uplink, flexible, or SBFD) in the other cell group, establishing a foundation for subsequent power allocation decisions.
Data Source
AI summary
A user equipment (UE) that includes one or more non-transitory computer-readable media storing one or more computer-executable instructions for determining the transmission power of the UE and at least one processor coupled to the one or more non-transitory computer-readable media is provided. The processor is configured to execute the one or more computer-executable instructions to cause the UE to determine that a subband full duplex (SBFD) resource in a downlink slot of a master cell group (MCG) overlaps, at least partially, an uplink resource in a uplink slot of a Secondary Cell Group (SCG) in time domain; and determine the transmission power of the uplink resource based on a maximum available transmission power associated with the SCG.