Reference Signal Reuse Indication for URLLC Interference
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Solution Overview
Problem
Current mobile communication systems face challenges in reducing interference between Ultra-Reliable Low Latency Communications (URLLC) and enhanced Mobile Broadband (eMBB) reference signals, especially when they are multiplexed and superimposed using different numerologies or are misaligned, which affects channel estimation and data demodulation performance.
Innovation Solution
The system employs a reference signal (RS) reuse indication mechanism, where a wireless transmit/receive unit (WTRU) receives a preemption indication and RS reuse indication, allowing it to determine a channel estimation function set based on the reuse level, thereby managing interference and ensuring accurate channel estimation and data decoding for both URLLC and eMBB transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If URLLC and eMBB reference signals are multiplexed using the same resources, then resource utilization efficiency is improved, but reference signal interference increases affecting channel estimation accuracy
Solution Approach 1:
The network entity transmits a preemption indication and RS reuse indication to the WTRU before the WTRU performs channel estimation. This allows the WTRU to proactively determine the appropriate channel estimation function set based on the indication received, preventing interference degradation before it occurs. The preliminary action enables the system to prepare for potential URLLC preemption of eMBB resources, ensuring accurate channel estimation by selecting the right estimation approach in advance.
Solution Approach 2:
The patent implements dynamic channel estimation by allowing the WTRU to switch between different channel estimation function sets based on the RS reuse indication. When URLLC preempts eMBB resources, the indication signals the WTRU to use a different estimation function that accounts for the preemption, thereby adapting the channel estimation process to current transmission conditions. This dynamic adjustment maintains measurement precision despite changing resource allocation patterns.
2Speed
If URLLC transmission preempts eMBB transmission resources, then URLLC latency is reduced, but eMBB transmission reliability deteriorates
Solution Approach 1:
The network entity provides feedback to the WTRU through the preemption indication and RS reuse indication, informing the WTRU about URLLC preemption of eMBB resources. This feedback mechanism allows the WTRU to recognize when eMBB transmissions are preempted and adjust its channel estimation accordingly. By providing this feedback, the system maintains eMBB reliability despite preemption, as the WTRU can compensate for the interference caused by URLLC transmissions.
3Measurement precision
If different channel estimation function sets are used for different reuse levels, then channel estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements a tiered approach where the WTRU uses different channel estimation function sets based on the RS reuse indication level. Instead of always using the most complex estimation method, the WTRU applies the appropriate level of estimation complexity based on the preemption condition. This partial action principle allows the system to achieve high accuracy when needed while reducing processing complexity when URLLC preemption is not occurring, optimizing the balance between precision and device complexity.
Data Source
AI summary
Interference for reference symbols in URLLC/eMBB multiplexing may be reduced. URLLC and/or eMBB reference signal (RS) interference may be reduced regardless whether the URLLC and eMBB reference signals and data are multiplexed and superimposed using the same numerology or different numerologies and/or regardless whether the URLLC and eMBB reference signals may be aligned or misaligned (e.g., may or may not use a common resource). An URLLC transmission may preempt an eMBB transmission. For the URLLC and eMBB transmissions using a same numerology, a RS reuse indication may be used. The RS reuse indication may indicate whether a RS in the preempted portion of the eMBB transmission may be reused. A channel estimation function set may be estimated, and channel estimation may be performed using the determined channel estimation function set. The eMBB transmission and the URLLC transmission may be decoded based on the performed channel estimation.