Uplink Power Sharing Control for Concurrent Small Cell Transmissions
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Solution Overview
Problem
In wireless communication networks, the deployment of small cells to offload data traffic from macro cells faces challenges in managing concurrent uplink transmissions, particularly in scenarios where the total uplink transmit power exceeds thresholds due to high latency in backhaul links and independent scheduling by multiple wireless access network nodes, leading to difficulties in detecting dropped or reduced control signals.
Innovation Solution
Implementing uplink transmit power sharing control mechanisms, including prioritization rules and power scaling techniques, to manage concurrent uplink transmissions across multiple wireless access network nodes, ensuring that the total uplink power does not exceed specified thresholds by adjusting the power of lower-priority transmissions and dropping or scaling them as necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small cells are deployed to offload data traffic from macro cells, then data communication capacity is increased, but management of concurrent uplink transmissions becomes more complex
Solution Approach 1:
The patent segments the uplink transmission management into separate components: a macro cell scheduler handles macro cell transmissions while a small cell scheduler handles small cell transmissions. Each scheduler operates independently but coordinates through prioritization rules, dividing the complex management task into manageable segments that can be handled by individual network nodes.
Solution Approach 2:
The patent introduces prioritization rules as an intermediary mechanism between multiple independent schedulers. These rules act as a mediator that resolves conflicts when total uplink power exceeds thresholds, enabling coordination between macro and small cell schedulers without requiring direct complex interaction between them.
2Adaptability or versatility
If independent scheduling is used by multiple wireless access network nodes, then scheduling flexibility is improved, but detection of dropped or reduced control signals becomes difficult
Solution Approach 1:
The patent implements feedback mechanisms where network nodes monitor total uplink power levels and detect when power thresholds are exceeded. This feedback allows the system to identify when control signals have been dropped or reduced due to power sharing requirements, enabling the independent schedulers to adjust their operations accordingly.
Solution Approach 2:
The patent replaces direct mechanical coordination between schedulers with a power-based detection mechanism. Instead of requiring complex signaling protocols to coordinate between independent schedulers, the system uses power level monitoring to infer when conflicts occur and control signals are affected, simplifying the detection mechanism.
3Reliability
If total uplink power threshold is enforced, then power management reliability is improved, but transmission power of lower-priority signals is reduced
Solution Approach 1:
The patent applies partial power reduction to lower-priority signals when total uplink power exceeds thresholds. Instead of reducing all signals uniformly, the system selectively applies power reduction only to lower-priority transmissions while maintaining full power for higher-priority signals, achieving power management reliability without excessive impact on overall transmission capacity.
Solution Approach 2:
The patent applies different power management strategies to different types of signals based on their priority. Higher-priority control signals maintain full transmission power while lower-priority signals undergo power reduction. This local differentiation ensures that critical signaling functions remain reliable while still enforcing overall power management requirements.
Data Source
AI summary
A user equipment detects that an aggregate of calculated uplink transmit power of the UE exceeds a threshold. In response to the detecting, a power of at least one of a plurality of frequency-division multiplexing (FDM)-based uplink transmissions of the UE over corresponding wireless connections with respective wireless access network nodes is adjusted.