OCC Uplink Transmission Postponement for Orthogonality Gaps
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Solution Overview
Problem
In wireless communication systems using orthogonal cover codes (OCCs) for multiplexing multiple user equipments (UEs), uplink transmission gaps and downlink reception gaps cause loss of orthogonality due to carrier frequency offset, degrading performance and interfering with OCC-based multiplexing.
Innovation Solution
The method involves identifying and postponing uplink transmissions according to a postponement period to mitigate the impact of uplink and downlink gaps, thereby maintaining orthogonality and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink transmissions are performed continuously without postponement, then transmission efficiency is improved, but orthogonality is lost due to carrier frequency offset during transmission gaps
Solution Approach 1:
The patent applies preliminary action by identifying and postponing uplink transmissions before transmission gaps occur. The UE determines a postponement period in advance and delays the transmission start time to align with the end of the gap, preventing orthogonality loss before it happens rather than correcting it after the fact.
Solution Approach 2:
The patent implements dynamics by making the transmission timing flexible and adaptive. Instead of fixed continuous transmission, the UE dynamically adjusts the transmission start time based on the identified transmission gap and postponement period, allowing the system to adapt to varying gap conditions while maintaining orthogonality.
2Adaptability or versatility
If transmission gaps are introduced to accommodate downlink receptions, then full-duplex capability is improved, but interference occurs due to loss of orthogonality in OCC-based multiplexing
Solution Approach 1:
The patent converts the harmful effect of transmission gaps (which cause orthogonality loss) into a benefit by using the gap timing information to optimize uplink transmission scheduling. The postponement mechanism transforms the gap from a source of interference into a scheduling reference that actually improves orthogonality maintenance and reduces interference.
Solution Approach 2:
The patent introduces the postponement period as an intermediary mechanism between the transmission gap and the uplink transmission. This intermediary element mediates the relationship by adjusting the transmission timing to account for the gap's impact on orthogonality, thereby eliminating the harmful interference effect.
3Productivity
If OCC-based multiplexing is used to increase network capacity, then system performance is improved, but carrier frequency offset during gaps degrades multiplexing performance
Solution Approach 1:
The patent applies preliminary action by proactively adjusting transmission timing before OCC-based multiplexing operations are affected by transmission gaps. The UE calculates the postponement period in advance based on gap information, ensuring that orthogonality is preserved for the duration of the multiplexed transmission, thereby maintaining high multiplexing performance.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify a postponement period for postponing a transmission of an uplink communication to which an orthogonal cover code (OCC) has been applied. The UE may postpone the transmission of the uplink communication according to the postponement period. Numerous other aspects are described.