Uplink Open Loop Power Control for Wireless Networks
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Solution Overview
Problem
Existing uplink power control systems in wireless access networks, particularly in OFDMA/MIMO systems, face challenges in balancing link performance and terminal battery power while managing inter-base station uplink co-channel interference, leading to inefficiencies in power control and increased signaling overhead.
Innovation Solution
The implementation of an uplink open loop transmit power control system, where the mobile station independently adjusts transmit power based on feedback and initial settings from the base station, reducing reliance on base station controls and enhancing flexibility and reducing signaling overhead by using an antenna module with a TPC module to calculate and adjust power levels based on interference and noise conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base station controls transmit power levels, then link performance is maintained, but signaling overhead increases
Solution Approach 1:
The mobile station autonomously determines its transmit power level by calculating path loss based on downlink reference signals and applying open-loop power control formulas, eliminating the need for continuous base station power control commands. This self-service approach maintains link performance while dramatically reducing uplink signaling overhead.
Solution Approach 2:
The system pre-configures power control parameters including path loss reference signals, power control adjustment states, and target received power levels during initial connection establishment. These preliminary configurations enable the mobile station to independently adjust power without real-time base station intervention, reducing ongoing signaling requirements.
2Reliability
If transmit power is increased, then link performance improves, but terminal battery power is depleted faster
Solution Approach 1:
The mobile station continuously monitors downlink reference signal quality and adjusts transmit power based on measured path loss variations. This feedback mechanism ensures the terminal transmits at the minimum necessary power to maintain acceptable link performance, avoiding unnecessary battery consumption while preserving communication reliability.
Solution Approach 2:
The power control system dynamically adjusts transmit power levels based on real-time channel conditions, mobility state, and buffer status. Rather than using fixed high power levels, the system adapts power transmission to actual needs, improving link performance when necessary while conserving battery power during favorable conditions.
3Reliability
If transmit power is increased, then uplink signal strength improves, but inter-base station co-channel interference increases
Solution Approach 1:
The power control system applies cell-specific path loss compensation factors and power control adjustment states that are tailored to local interference conditions. Each mobile station receives customized power control parameters from its serving base station, enabling precise local power optimization that improves uplink signal strength without uniformly increasing interference across all cells.
Solution Approach 2:
The system changes multiple power control parameters including path loss reference signal powers, power control adjustment states, and target received power levels to optimize the balance between uplink signal strength and inter-cell interference. These parameter adjustments allow the network to adapt to varying interference conditions and maintain efficient spectrum utilization.
Data Source
AI summary
Embodiments of the present invention provide an uplink open loop power control system in which interference over thermal information is transmitted to mobile stations. Other embodiments may be described and claimed.