UE Uplink Timing for Priority Channel Multiplexing and Cancellation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing collisions between uplink channels of different priorities, particularly when a low-priority channel overlaps with multiple high-priority channels, and there is a need for effective multiplexing and cancellation techniques to optimize spectrum use.
Innovation Solution
The proposed solution involves canceling low-priority uplink channels before they overlap with high-priority channels and determining the expected transmission times for high-priority channels based on subcarrier spacing and UE processing capabilities, allowing for multiplexing of uplink channels with the same priority and piggybacking control information on data channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If low-priority uplink channels are transmitted simultaneously with high-priority channels, then spectrum utilization is improved, but collision interference increases and transmission reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by determining the expected transmission time of high-priority channels before actual transmission occurs. The UE calculates when high-priority channels will be transmitted based on timing relationships, and proactively cancels low-priority channel transmissions that would collide with these high-priority channels, preventing interference before it happens.
Solution Approach 2:
The patent segments uplink channels by priority levels, separating high-priority and low-priority channel handling. By identifying and isolating low-priority channels that would collide with high-priority channels, the system can selectively cancel only the conflicting low-priority transmissions while maintaining transmission of non-conflicting channels, thus preserving spectrum utilization for non-interfering traffic.
2Reliability
If low-priority uplink channels are canceled before overlapping with high-priority channels, then collision interference is reduced, but transmission time is lost
Solution Approach 1:
The patent applies partial action by selectively canceling only those low-priority channel transmissions that would collide with high-priority channels, rather than canceling all low-priority channels. This partial cancellation approach minimizes transmission time loss while still achieving the goal of reducing collision interference for the specific conflicting channels.
3Adaptability or versatility
If multiple high-priority channels are scheduled with different timing, then transmission flexibility is improved, but determining cancellation timing for low-priority channels becomes more complex
Solution Approach 1:
The patent determines the expected transmission time of high-priority channels in advance, before the actual transmission occurs. By calculating timing relationships beforehand and identifying which low-priority channels would collide with which high-priority channels, the system simplifies the real-time decision-making process despite multiple high-priority channels with different timings.
Data Source
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AI summary
A method for wireless communications performed by a user equipment (UE) includes receiving a low priority (LP) grant for scheduling an LP uplink transmission in a slot. The LP uplink transmission may overlap a set of high priority (HP) uplink transmissions in the slot. The method also includes determining an uplink shared channel preparation time as a function of a subcarrier spacing (SCS) configuration and a UE processing time capability based on the LP uplink transmission overlapping the set of HP uplink transmissions. The method further includes determining a time period until an expected transmission time for each respective HP uplink transmission of the set of HP uplink transmissions scheduled based on a corresponding HP grant, the time period being a function of the uplink shared channel preparation time and a time duration corresponding to a reported UE capability. The method also includes canceling the LP uplink transmission before a symbol of the LP uplink transmission overlaps an earliest HP uplink transmission of the set of HP uplink transmissions.