UCI Multiplexing on PUSCH With Priority-Based Timing Thresholds
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, the multiplexing of uplink control information (UCI) with uplink data on physical uplink shared channels (PUSCH) can lead to delays in high-priority UCI transmissions when lower-priority data is scheduled later, failing to meet ultra-reliable low-latency communication (URLLC) constraints.
Innovation Solution
The method involves determining whether to multiplex UCI based on the transmission timing difference between scheduled and multiplexed transmission times, allowing the UE and base station to decide on multiplexing based on thresholds for start and end times to minimize latency and ensure URLLC compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UCI is multiplexed with lower-priority data on PUSCH, then resource utilization is improved, but transmission latency increases and URLLC requirements are not met
Solution Approach 1:
The patent applies dynamics by making the multiplexing decision adaptive rather than fixed. The UE dynamically determines whether to multiplex UCI with lower-priority data based on comparing transmission timing differences against configured thresholds. This dynamic approach allows the system to optimize resource utilization when multiplexing is beneficial while ensuring low latency when URLLC requirements must be met.
Solution Approach 2:
The patent changes the parameter of transmission timing by introducing threshold-based decision logic. The system compares the timing difference between scheduled UCI transmission and multiplexed UCI transmission against configured thresholds (first threshold for start time, second threshold for end time). This parameter change enables flexible control over when multiplexing occurs, allowing optimization of both resource utilization and latency performance.
2Productivity
If UCI transmission is scheduled later to accommodate multiplexing with lower-priority data, then resource efficiency is improved, but latency requirements for high-priority communications are violated
Solution Approach 1:
The patent implements feedback through the base station configuring threshold values that the UE uses to make multiplexing decisions. The base station provides feedback information including these thresholds, allowing the UE to continuously monitor transmission timing differences and adjust multiplexing behavior to maintain URLLC reliability while optimizing resource efficiency.
Solution Approach 2:
The system dynamically adjusts UCI transmission timing based on real-time comparison of scheduling information against configured thresholds. This dynamic adaptation enables the system to maintain URLLC reliability when needed while achieving resource efficiency through multiplexing when appropriate, resolving the contradiction between the two objectives.
3Ease of operation
If the UE always multiplexes UCI with PUSCH data, then control information is transmitted efficiently, but high-priority UCI latency is increased
Solution Approach 1:
The patent transforms the static multiplexing approach into a dynamic one by introducing threshold-based decision logic. The UE dynamically evaluates each UCI transmission opportunity by comparing timing differences against configured thresholds, allowing efficient multiplexing when timing allows while preventing latency violations for high-priority UCI when thresholds are not met.
Solution Approach 2:
The system changes the operational parameter from always-multiplexing to conditional multiplexing based on timing parameters. By introducing threshold comparisons for both start time and end time parameters, the system optimizes UCI transmission efficiency while maintaining control over latency performance for high-priority communications.
Data Source
AI summary
Aspects are provided which allow for multiplexing of higher priority uplink transmissions with lower priority uplink transmissions while maintaining URLLC of the higher priority uplink transmission. A UE receives from a base station information including resources for first and second uplink data, where at least a portion of the resources for the first and second uplink data overlap in time. The first and second uplink data are associated with different priority levels. The UE determines whether to multiplex the uplink data based on a transmission timing difference between a scheduled transmission time and a multiplexed transmission time for the second uplink data on the respective resources. The base station makes a similar determination. If the transmission timing difference fails to meet a delay threshold, multiplexing is performed; otherwise, the lower priority transmission is dropped. Thus, different priority multiplexing may occur in low latency situations, satisfying URLLC.