LTE NR Signal Separation via Timing Advance Scheduling
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Solution Overview
Problem
The coexistence of LTE and NR signals in wireless communication systems poses challenges due to timing advances (TAs) differences, leading to interference and overlapping transmission/reception issues, which affect signal quality and latency.
Innovation Solution
The proposed method involves semi-statically separating time durations for LTE and NR signal transmissions/receptions, adjusting scheduling between LTE and NR BSs, and configuring reserved resources to minimize interference by reporting TA differences and dynamically managing symbol transmission/ reception based on TA values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE and NR signals are transmitted simultaneously without separation, then resource utilization is improved, but interference and signal quality deteriorate due to timing advance differences
Solution Approach 1:
The patent segments the time duration into different regions (first region and second region) based on timing advance differences. LTE uplink signals are transmitted in the first region while NR signals are transmitted in the second region, preventing overlap and interference between the two systems while maintaining efficient resource utilization.
Solution Approach 2:
The patent dynamically determines transmission regions by comparing timing advance values. The network device adjusts which region (first or second) is used for LTE uplink transmission based on real-time TA differences, allowing flexible adaptation to changing channel conditions while avoiding interference.
2Ease of operation
If timing advance differences are not considered, then transmission simplicity is maintained, but overlapping transmission/reception occurs causing latency issues
Solution Approach 1:
The patent performs preliminary determination of timing advance differences between LTE and NR systems before transmission. Based on this pre-calculated TA difference, the network device pre-assigns transmission regions (first or second region) to avoid overlapping, thereby preventing latency issues caused by retransmissions or buffer waits.
3Object-affected harmful factors
If semi-static separation of time durations is implemented, then interference is reduced, but scheduling complexity increases between LTE and NR BSs
Solution Approach 1:
The patent applies different transmission qualities to different time regions. The first region is optimized for LTE uplink transmission while the second region is optimized for NR transmission. This localized quality assignment reduces interference without requiring complex full-system coordination, as each region has dedicated optimization.
Data Source
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AI summary
The present invention relates to a signal transceiving method and device for a terminal dual-connected to a first radio access technology (RAT) and a second RAT in a wireless communication system, wherein the method includes: a step for scheduling a first signal according to the first RAT and a second signal according to the second RAT so that the first signal and second signal are temporally separated; and a step for transceiving the first signal and the second signal, wherein the first signal is dropped when the first signal and the second signal overlap in a first time domain due to timing advance (TA).