Uplink Carrier Aggregation Power Control Using Power Headroom Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In uplink carrier aggregation, existing power control methods prioritize the primary cell over secondary cells, leading to insufficient power for secondary cell transmissions, especially when UEs are far from the gNodeB, resulting in reduced throughput and inefficient utilization of available bandwidth.
Innovation Solution
Dynamic adjustment of primary cell transmission power based on power headroom reports and closed-loop power control to ensure adequate power is available for both primary and secondary cells, using a desired power headroom target to optimize power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is prioritized for the primary cell, then the primary cell maintains high throughput and reliable connection, but secondary cells receive insufficient power leading to reduced throughput
Solution Approach 1:
The patent implements dynamic power control by continuously monitoring power headroom reports from the UE and adjusting the primary cell's power allocation in real-time. This allows the system to dynamically balance power between primary and secondary cells based on current channel conditions, ensuring primary cell reliability while enabling secondary cells to receive adequate power when available, thus resolving the contradiction between primary cell reliability and secondary cell throughput.
Solution Approach 2:
The patent utilizes power headroom reporting feedback from the UE to the gNodeB. The UE reports its remaining power capacity, and the gNodeB uses this feedback to adjust power allocation decisions. This feedback mechanism enables the system to respond to changing power conditions and optimize the balance between primary and secondary cell power distribution, addressing the throughput limitation of secondary cells while maintaining primary cell reliability.
2Productivity
If total transmission power is increased to support multiple carriers, then more bandwidth can be utilized, but power per carrier decreases leading to insufficient power for secondary cells
Solution Approach 1:
The patent implements dynamic power control by continuously monitoring power headroom reports from the UE and adjusting the primary cell's power allocation in real-time. This allows the system to dynamically balance power between primary and secondary cells based on current channel conditions, ensuring primary cell reliability while enabling secondary cells to receive adequate power when available, thus resolving the contradiction between primary cell reliability and secondary cell throughput.
Solution Approach 2:
The patent changes the power allocation parameters dynamically based on power headroom conditions. When power headroom is sufficient, the system allocates more power to secondary cells to utilize available bandwidth. When power headroom is low, the system adjusts parameters to ensure minimum power requirements are met. This parameter adjustment resolves the contradiction between total bandwidth utilization and power per carrier.
3Ease of manufacture
If fixed P0 settings are used for power control, then configuration is simple, but individual UE requirements cannot be optimized leading to inefficient power utilization
Solution Approach 1:
The patent utilizes power headroom reporting feedback from the UE to the gNodeB. The UE reports its remaining power capacity, and the gNodeB uses this feedback to adjust power allocation decisions. This feedback mechanism enables the system to respond to changing power conditions and optimize the balance between primary and secondary cell power distribution, addressing the throughput limitation of secondary cells while maintaining primary cell reliability.
Solution Approach 2:
The patent enables the UE to self-report its power headroom status to the gNodeB. The UE autonomously monitors its own power conditions and provides this information to the network, allowing the gNodeB to make informed power allocation decisions. This self-service approach maintains configuration simplicity while achieving optimized power utilization efficiency.
Data Source
AI summary
According to an aspect, there is provided a method performed by a base station for adjusting a transmission power of a primary cell of a cell group. The method comprises receiving (302), from a wireless device, an indication of a first power headroom associated with the primary cell; determining (304) a power headroom target; comparing (306) the first power headroom and the power headroom target; and determining (308) whether to adjust a transmission power of the primary cell based on the comparison.