Dynamic Uplink SCell Threshold Control for Spectral Efficiency
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Solution Overview
Problem
The existing uplink carrier aggregation in wireless communication systems faces challenges due to limited UE transmission power, leading to strain when concurrently transmitting on multiple channels, and the fixed UL-SCell-deconfig threshold may not be optimal for varying operational circumstances or spectral efficiency.
Innovation Solution
The access node dynamically varies the UL-SCell-deconfig threshold based on operational circumstances such as the type of communication and UE power class, as well as evaluates and adjusts it based on uplink spectral efficiency to optimize the release of secondary cells and improve spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink carrier aggregation is implemented to increase data rate, then uplink throughput is improved, but UE transmission power is strained due to concurrent transmission on multiple channels
Solution Approach 1:
The patent implements dynamic adjustment of the UL-SCell-deconfig threshold based on uplink spectral efficiency measurements. The threshold is no longer fixed but adapts to current channel conditions and spectral efficiency, allowing the system to dynamically optimize the balance between carrier aggregation benefits and power constraints. When spectral efficiency is high, the threshold can be adjusted to maintain more SCells; when low, the threshold triggers SCell release to conserve power.
Solution Approach 2:
The patent changes the parameter of the UL-SCell-deconfig threshold from a fixed value to a dynamically adjustable parameter based on spectral efficiency. By monitoring uplink spectral efficiency and adjusting the threshold accordingly, the system optimizes the decision-making parameter for SCell configuration, resolving the contradiction between maintaining carrier aggregation for high throughput and managing UE power constraints.
2Device complexity
If a fixed UL-SCell-deconfig threshold is used to control SCell release, then system complexity is reduced, but spectral efficiency is not optimized for varying operational circumstances
Solution Approach 1:
The patent introduces a feedback mechanism where the access node measures uplink spectral efficiency and uses this measurement to dynamically adjust the UL-SCell-deconfig threshold. The spectral efficiency measurement provides feedback about current channel conditions and system performance, which is then used to optimize the threshold parameter. This closed-loop feedback system resolves the contradiction by automatically adapting to varying operational circumstances without requiring complex manual configuration.
Solution Approach 2:
The system performs self-optimization by automatically measuring spectral efficiency and adjusting its own threshold parameter based on these measurements. The access node autonomously adapts the UL-SCell-deconfig threshold to current conditions without external intervention, enabling the system to self-optimize spectral efficiency while maintaining manageable complexity through automated decision-making.
3Loss of energy
If SCell is released early to conserve UE power, then power consumption is reduced, but uplink spectral efficiency deteriorates
Solution Approach 1:
The patent dynamically changes the UL-SCell-deconfig threshold parameter based on measured spectral efficiency, enabling adaptive optimization of the SCell release decision. Instead of using a fixed conservative threshold that would trigger early SCell release, the system adjusts the threshold to reflect current spectral efficiency conditions, thereby optimizing the trade-off between power conservation and maintaining productive uplink transmission.
Solution Approach 2:
The system dynamically adapts the threshold parameter in response to changing spectral efficiency conditions, allowing flexible optimization of the SCell release timing. When spectral efficiency is high, the system can maintain SCells longer to maximize throughput; when low, it can release SCells earlier to conserve power, dynamically balancing these competing objectives.
Data Source
AI summary
A method and system for controlling wireless service of a user equipment device (UE) by an access node. The access node serves the UE with uplink carrier-aggregation over a connection that encompasses encompassing multiple uplink channels including a primary uplink channel (uplink PCell) and a secondary uplink channel (uplink SCell). Further, the access node dynamically sets a channel-quality threshold (e.g., an RSRP threshold) applicable to control when to deconfigure the uplink SCell from service of the UE, with the dynamically setting of the channel-quality threshold including iteratively adjusting the channel-quality threshold based on uplink spectral efficiency of the access node. And the access node applies the dynamically set channel-quality threshold to control when to deconfigure the uplink SCell from service of the UE.