Downlink MIMO DC-Subcarrier Power Control for UE BLER
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Solution Overview
Problem
Existing MIMO systems experience significant block error rates (BLER) and throughput issues due to direct current (DC) offsets in user equipment (UE), particularly affecting UEs further away from the base station, leading to CRC failures and reduced sector throughput.
Innovation Solution
A system and method that dynamically adjusts the power level of resource blocks containing DC subcarriers based on BLER feedback, increasing the DC subcarrier power up to a predetermined level if BLER exceeds a target, and adjusting power levels based on UE proximity to the base station to maintain optimal throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DC subcarrier power is increased to mitigate DC offset effects, then BLER is reduced and CRC success rate improves, but system complexity and energy consumption increase
Solution Approach 1:
The patent implements dynamic adjustment of DC subcarrier power levels based on real-time BLER measurements and UE distance from base station. The system transitions from static power allocation to dynamic power control, adjusting the DC subcarrier power only when and where needed (when BLER exceeds threshold and UE is distant), thereby improving reliability without permanently increasing system complexity
Solution Approach 2:
The patent applies different power levels to different subcarriers specifically targeting the DC subcarrier that is affected by offset issues. Instead of uniformly increasing power across all subcarriers, the solution locally enhances only the problematic DC subcarrier power, reducing unnecessary energy consumption and system complexity while addressing the specific reliability issue
2Productivity
If DC subcarrier power is increased to improve throughput, then sector throughput increases, but energy consumption increases
Solution Approach 1:
The patent changes the power parameter of the DC subcarrier dynamically based on measured BLER and UE distance conditions. By adjusting the power parameter only when necessary (when BLER > threshold and UE is distant), the system achieves throughput improvement without continuous energy consumption increase
Solution Approach 2:
The patent applies power enhancement only partially - specifically to the DC subcarrier and only for distant UEs with high BLER, rather than uniformly across all UEs and subcarriers. This partial action achieves the necessary throughput improvement while minimizing unnecessary energy consumption
Data Source
AI summary
The present invention provides a method and system for facilitating improved downlink MIMO sector throughput in the presence of UE DC-offset. The system receives BLER from a plurality of UEs and tracks by L1 computing the DL BLER in a UE; checks if the BLER from the UE allocated with an RB containing a DC subcarrier is above a target BLER and if so the L1 increases the power of the RE containing the DC-subcarrier in steps of 3 dB. If the BLER improves in the UE, the L1 stops further increase of power on the DC subcarrier RE. The L1 maintains the improved UE/sector throughput and the subcarrier RE power. The system further supports a plurality of 5G NR UEs with different bandwidth wherein the DC-carrier of each UE can be worked out by the L2 by a set of predefined instructions.