Sidelink Transmit Power Control for NR LTE Coexistence
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Solution Overview
Problem
Current wireless communication systems face challenges in managing sidelink transmission power control for New Radio (NR) and Long Term Evolution (LTE) co-channel coexistence, leading to potential interference and incorrect automatic gain control (AGC) settings, which degrade network performance.
Innovation Solution
The proposed solution involves determining and adjusting transmit powers for consecutive slots associated with NR and LTE to ensure equal or similar power levels, facilitating correct AGC settings and improving network performance by coordinating sidelink transmissions across overlapping time periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NR sidelink transmits on consecutive slots mapping to LTE time period, then NR data transmission is enabled, but AGC settings become incorrect and interference occurs
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmit power level of NR sidelink based on the detected LTE time period. When an LTE time period is detected, the NR sidelink reduces its transmit power to a first power level, and when only NR time period is detected, it uses a second power level. This dynamic parameter adjustment resolves the contradiction by enabling NR transmission while preventing AGC setting errors through power level adaptation.
2Productivity
If NR and LTE share the same time period, then spectrum utilization is improved, but mutual interference increases
Solution Approach 1:
The system changes the transmit power parameter based on the detected time period type. When LTE time period is detected, NR sidelink transmits at a reduced first power level to minimize interference with LTE. When only NR time period is detected, it transmits at a higher second power level to maximize spectrum utilization. This resolves the contradiction by adapting power levels to the temporal context.
Solution Approach 2:
The transmit power is made dynamic rather than fixed. The system continuously monitors the time period structure and adjusts power levels accordingly. This dynamic adjustment allows the system to exploit temporal variations to coexist with LTE while maintaining NR performance, resolving the interference-utilization contradiction.
3Device complexity
If fixed transmit power is used for NR sidelink, then device complexity is reduced, but co-channel coexistence with LTE deteriorates
Solution Approach 1:
The system implements feedback by detecting the time period structure (NR or LTE) and using this information to adjust the transmit power accordingly. The feedback loop monitors the temporal characteristics of the channel and adapts power levels in response. This resolves the contradiction by adding only minimal feedback capability while achieving robust co-channel coexistence.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine to transmit data associated with a first radio access technology (RAT) on a set of consecutive slots, associated with the first RAT, that map to a time period associated with a second RAT. The UE may determine a set of transmit powers associated with the set of consecutive slots. The UE may transmit the data associated with the first RAT using the set of transmit powers and in accordance with a first numerology. The first numerology may be associated with the first RAT and may be different than a second numerology that is associated with the second RAT. Numerous other aspects are described.