Uplink Reference Signal Symbol Timing for Overlap-Free Demodulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Uplink transmissions from user equipment to an access network face challenges due to propagation delays, leading to potential overlap of reference signal symbols, which hampers effective demodulation of other symbols.
Innovation Solution
Adopting a modified pattern of time positions for reference signal symbols to avoid overlap between uplink transmissions, adjusting based on timing advance changes exceeding a threshold, and utilizing pre-defined patterns configured through downlink control information or radio resource control signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed pattern of time positions for reference signal symbols is used, then the structure is simple, but reference signal symbols may overlap with other uplink transmissions causing demodulation failures
Solution Approach 1:
The patent applies dynamics by making the reference signal symbol time positions adjustable rather than fixed. The network entity can dynamically modify the time positions of reference signal symbols based on timing advance changes and overlap conditions, allowing the system to adapt to varying propagation delays and avoid overlaps with other uplink transmissions while maintaining reliable demodulation
2Loss of time
If the timing advance is increased to account for propagation delay, then the uplink transmission timing is adjusted, but reference signal symbols may still overlap with other transmissions
Solution Approach 1:
The patent applies preliminary action by proactively adjusting the time positions of reference signal symbols before overlaps occur. The network entity determines timing advance changes in advance and modifies the reference signal time positions accordingly, preventing overlaps with other uplink transmissions before they happen rather than reacting after overlaps occur
Solution Approach 2:
The patent applies parameter changes by modifying the time position parameters of reference signal symbols based on timing advance changes. When the timing advance exceeds a threshold, the system changes the time position parameters to shift reference signal symbols to non-overlapping positions, dynamically adapting to propagation delay variations
3Ease of manufacture
If reference signal symbols are placed at regular intervals, then the pattern is simple to implement, but they may fall in overlap regions during timing advance changes
Solution Approach 1:
The patent transforms the static regular interval pattern into a dynamic adjustable pattern. The network entity can modify the time positions of reference signal symbols based on timing advance changes and overlap conditions, allowing the system to maintain simple regular patterns when conditions permit while switching to adjusted patterns when overlaps are detected or predicted
Data Source
AI summary
The present disclosure relates to method and apparatus related to reference signal symbols for uplink transmissions.