PUCCH Power Control for Dual-Connectivity Robustness
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Solution Overview
Problem
In dual-connectivity communication scenarios, particularly in LTE systems, the challenge lies in reducing the transmitting power of the Physical Uplink Control Channel (PUCCH) signal when the total power exceeds the maximum limit, especially when multiple carriers are involved, to ensure robust communication without dropping calls during handovers between small cells.
Innovation Solution
A method where the UE receives downlink signaling to obtain power control parameters for both primary and secondary cells, allowing it to transmit PUCCH signals with reduced power on the secondary cell while maintaining optimal power on the primary cell, ensuring the PUCCH signal priority is lower for the secondary cell, thereby preventing power exceeding the maximum total transmitting power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits PUCCH signals on both primary cell and secondary cell simultaneously with full power, then the communication capacity and robustness are improved, but the total transmitting power exceeds the maximum limit causing power overload
Solution Approach 1:
The patent applies local quality by assigning different power levels to different PUCCH transmissions based on cell type. The primary cell PUCCH maintains full power to ensure critical control signaling reliability, while the secondary cell PUCCH transmits at reduced power. This differentiated approach allows the system to maintain overall communication robustness while preventing total power from exceeding maximum limits.
2Power
If the UE reduces power of PUCCH on secondary cell, then the total transmitting power is controlled within maximum limit, but the receiving quality of PUCCH on secondary cell may deteriorate
Solution Approach 1:
The patent introduces power control parameters as intermediaries that mediate between the need to control total power and maintain signal quality. The base station configures power control parameters (P0, path loss compensation factors) that allow the UE to calculate appropriate transmit powers for PUCCH on secondary cells, ensuring quality is maintained within power constraints.
3Reliability
If the UE maintains full power transmission on all serving cells, then the link quality is optimized, but the power distribution becomes unbalanced causing interference and power waste
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting power control parameters based on channel conditions, cell type, and traffic requirements. The system changes power parameters (P0 offsets, path loss compensation factors α) to optimize link quality while minimizing power consumption. This allows flexible adaptation to different scenarios without wasting power on transmissions that don't require maximum power.
Data Source
AI summary
A method and a device for multiple-serving-cell connectivity in a UE and in a base station are disclosed in the present invention. Addressing the problem of the PUCCH power reduction that can be caused by PUCCH transmission on a secondary cell during dual-connectivity communication, the present invention provides a solution for PUCCH power reduction during dual-connectivity communication. In one embodiment, when power is reduced, the priority of PUCCH transmission on a secondary cell is lower than the priority of PUCCH transmission on a primary cell. The present invention can ensure PUCCH reception quality on a primary cell, guaranteeing the robustness of UE connectivity. Moreover, the present invention maintains the highest degree of compatibility with present systems.