Dynamic UL Power Control for Interference Avoidance
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Solution Overview
Problem
Next-generation wireless cellular communication systems face interference issues in unlicensed spectrum usage, particularly in scenarios where Downlink (DL) transmissions from neighboring nodes interfere with Uplink (UL) transmissions, impacting Signal-to-Interference-plus-Noise Ratio (SINR) and overall network performance.
Innovation Solution
Implementing mechanisms for UL transmission enhancement and reduced-power DL transmission, including higher-layer configuration and dynamic power control, to mitigate interference by modulating UL power and reducing DL transmission power based on interference conditions, thereby improving SINR and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If DL transmission power is increased to improve network coverage and signal strength, then coverage area is improved, but interference to UL transmissions from neighboring nodes increases
Solution Approach 1:
The patent implements dynamic power control where DL transmission power is adjusted in real-time based on detected UL transmission activities from neighboring nodes. The eNB monitors the unlicensed spectrum for UL transmissions and dynamically modifies its DL power levels to avoid causing interference, transforming the static power transmission into a dynamic adaptive process.
Solution Approach 2:
The patent changes the power parameter of DL transmissions based on interference conditions. When UL transmissions are detected in the unlicensed spectrum, the system modifies the power parameter of subsequent DL transmissions to reduce interference, while maintaining adequate signal strength for coverage when interference is not present.
2Measurement precision
If UL transmission power is increased to improve uplink signal quality, then SINR is improved, but interference to DL transmissions from neighboring nodes increases
Solution Approach 1:
The patent implements dynamic UL power control where the UE adjusts its UL transmission power based on real-time detection of DL transmissions from neighboring eNBs. When DL transmissions are detected in the unlicensed spectrum, the UE dynamically reduces or modifies its UL power to avoid interference, while maintaining high SINR when the spectrum is clear.
Solution Approach 2:
The system employs feedback mechanisms where the UE monitors the unlicensed spectrum for DL transmissions and provides feedback to adjust UL power levels. This feedback loop enables the system to adapt UL transmission parameters based on the actual interference environment, optimizing SINR while minimizing interference to neighboring DL transmissions.
3Object-generated harmful factors
If LBT mechanism is implemented to reduce interference, then interference coordination is improved, but transmission delays and complexity increase
Solution Approach 1:
The patent segments the interference coordination function into specific procedures within the LBT framework. Rather than implementing a completely new complex protocol, the system divides the unlicensed spectrum access into distinct phases (listening, detecting, transmitting) with specific interference avoidance actions at each stage, making the overall system more manageable and implementable.
Data Source
AI summary
Described is an apparatus of a User Equipment (UE). The apparatus may comprise a first circuitry and a second circuitry. The first circuitry may be operable to establish that Downlink (DL) transmissions from a second Evolved Node-B (eNB) will interfere in one or more subframes with Uplink (UL) transmissions from the UE to a first eNB. The second circuitry may be operable to modulate a UL transmission power based upon the established interference condition.