Dynamic Overhead Channel Power Allocation in Base Stations
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Solution Overview
Problem
Conventional wireless communication systems face inefficiencies in coverage and performance due to fixed overhead channel power allocation, leading to unused power and suboptimal system performance, especially in CDMA systems where inter-cell interference limits gains from increasing overhead channel power.
Innovation Solution
Implementing a dynamic overhead channel power allocation scheme that adjusts power based on traffic channel power allocation and total available power, using techniques like IIR filters to allocate power dynamically among pilot, paging, and synchronization channels, ensuring maximum utilization of the power budget and maintaining fixed ratios or setting minimum and maximum power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overhead channel power is increased to improve SINR and coverage, then the probability of proper reception of overhead channels increases, but the available traffic capacity decreases due to power being shared between overhead and traffic channels
Solution Approach 1:
The patent implements dynamic overhead channel power allocation where the base station adjusts overhead channel power levels in real-time based on current traffic load conditions. When traffic load is low, more power is allocated to overhead channels to improve SINR and coverage. When traffic load is high, overhead channel power is reduced to preserve traffic capacity. This dynamic adjustment resolves the contradiction by making the power allocation adaptive rather than fixed.
Solution Approach 2:
The patent changes the power allocation parameters dynamically based on system conditions. Specifically, it modifies the overhead channel power percentage (typically 15-20% of total power) according to traffic load measurements. This parameter change allows the system to optimize the trade-off between overhead channel reliability and traffic capacity depending on current network conditions.
2Ease of operation
If fixed overhead channel power allocation is used to simplify system operation, then system complexity is reduced, but power utilization efficiency decreases leading to unused power and suboptimal performance
Solution Approach 1:
The patent implements a feedback mechanism where the base station continuously monitors traffic load conditions and uses this information to adjust overhead channel power allocation. The system measures current traffic demand, compares it with allocation thresholds, and dynamically adjusts power levels accordingly. This feedback loop eliminates unused power by ensuring overhead channels receive appropriate power only when needed, rather than maintaining fixed allocations.
Solution Approach 2:
The system performs self-adjustment of power allocation based on its own monitoring of traffic conditions. The base station autonomously decides when to increase or decrease overhead channel power without requiring external control, thereby eliminating wasted power while maintaining simple operation through automated decision-making algorithms.
Data Source
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AI summary
The present invention provides a method for implementation in a base station that supports at least one downlink traffic channel and at least one overhead channel. The method includes determining power allocation(s) for overhead channel(s) based upon a measurement of downlink traffic channel power and a maximum transmission power of the base station. The method also includes transmitting signals over the overhead channel(s) using the power allocation concurrently with transmission of signals over the downlink traffic channel.