Duplex Timing Alignment Using Guard-Time Symbol Puncturing
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing timing alignment and interference in duplex operations, particularly in subband non-overlapping full duplex (SBFD) scenarios, leading to inefficiencies and potential interference due to guard time discrepancies.
Innovation Solution
A wireless transmit/receive unit (WTRU) adjusts its transmission by determining a guard time period based on timing advance commands and calculates a difference in symbol times to truncate, skip, or puncture transmissions as needed, ensuring alignment and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a guard time period is determined to accommodate timing advance in SBFD operations, then timing alignment is improved, but transmission resource utilization deteriorates due to truncation, skipping, or puncturing of symbols
Solution Approach 1:
The patent applies partial action by calculating the difference between the number of starting symbols and guard time symbols (delta_N) and selectively truncating, skipping, or puncturing only the overlapping portion of symbols rather than the entire transmission. This ensures timing alignment is maintained while minimizing the loss of transmission resources by acting only on the necessary subset of symbols that cause interference.
2Object-generated harmful factors
If transmissions are truncated, skipped, or punctured to avoid interference with guard time period, then interference is reduced, but transmission completeness deteriorates
Solution Approach 1:
The patent extracts and removes only the specific portion of transmission symbols that overlap with the guard time period (delta_N symbols) through truncation, skipping, or puncturing. This selective extraction eliminates the harmful interference caused by timing misalignment while preserving the completeness of the remaining transmission, thereby reducing interference without excessive loss of information.
3Manufacturing precision
If the number of starting symbols is reduced to fit within guard time period, then timing alignment is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent implements a dynamic approach by calculating delta_N based on the actual difference between starting symbols and guard time symbols, and adaptively adjusting the transmission by truncating, skipping, or puncturing only the necessary overlapping portion. This dynamic adjustment maintains timing alignment while maximizing transmission efficiency by preserving as many non-overlapping symbols as possible, rather than using a fixed reduction approach.
Data Source
AI summary
Systems, methods, and instrumentalities are disclosed herein associated with timing alignment in duplex. A wireless transmit/receive unit (WTRU) may be configured to determine a guard time period. The WTRU may receive information related to a grant allocation. The grant allocation may begin at a time associated with a number of starting symbol(s) within a subband. The WTRU may determine that the time associated with the number of starting symbol(s) is within the guard time period. The WTRU may calculate the difference between the time associated with the number of starting symbols and the start time of the guard time period. The WTRU may determine to puncture a part of the transmission that uses the grant allocation based on the size of the difference between the time associated with number of starting symbol(s) and the start time of the guard time period.