Uplink Resource Grouping for 5G URLLC Priority Transmission
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Solution Overview
Problem
In the 5G mobile communication system, when uplink radio resources overlap in the time domain, the UE faces challenges in prioritizing and transmitting uplink control information, leading to potential dropping of lower-priority information and increased latency in URLLC services due to the inability to transmit higher-priority information simultaneously.
Innovation Solution
The UE divides uplink radio resources into groups and determines how to transmit uplink information based on group membership and priority, allowing for joint transmission or prioritization of higher-priority information when resources overlap, ensuring timely transmission of critical URLLC data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits only the uplink control information with higher priority when uplink radio resources overlap, then the transmission reliability of high-priority information is improved, but the transmission latency increases and lower-priority information is dropped
Solution Approach 1:
The uplink radio resources are divided into multiple groups (first group and second group) based on priority levels. High-priority resources are separated into a first group and low-priority resources into a second group, allowing independent transmission decisions for each group without mutual interference, thus resolving the contradiction between reliability and latency
Solution Approach 2:
The transmission mechanism dynamically adapts based on resource group configuration. When resources of the same group overlap, joint transmission is attempted; when different groups overlap, high-priority transmission takes precedence. This dynamic behavior optimizes both reliability and latency based on real-time conditions
2Device complexity
If the UE cannot transmit multiple uplink control information simultaneously on overlapping resources, then the device complexity is reduced, but the productivity decreases due to resource re-transmission and wasted bandwidth
Solution Approach 1:
Multiple uplink control information that can be jointly transmitted are merged into a single transmission on one uplink radio resource. The UE determines whether joint transmission is possible and combines multiple information types (e.g., HARQ-ACK, CSI, SR) into one transmission, improving productivity while maintaining simple device architecture
Solution Approach 2:
The uplink radio resource is designed to serve multiple functions by carrying different types of uplink control information (HARQ-ACK, CSI, scheduling request) in different scenarios. This multi-functionality allows a single resource to handle various transmission needs, enhancing system productivity without increasing device complexity
3Reliability
If the UE prioritizes URLLC uplink control information transmission, then the reliability of URLLC service is improved, but the transmission of other uplink control information is delayed or dropped
Solution Approach 1:
Uplink radio resources are segmented into priority-based groups, with URLLC-related resources forming a first group and other resources forming a second group. This segmentation ensures that URLLC information receives dedicated transmission opportunities while lower-priority information in the second group can be transmitted when resources are available, reducing information loss
Solution Approach 2:
Different transmission qualities are applied to different resource groups locally. High-priority resources receive guaranteed transmission treatment for URLLC information, while low-priority resources accommodate other control information. This local quality differentiation resolves the contradiction between URLLC reliability and overall information transmission completeness
Data Source
AI summary
A user equipment (UE) and a base station (BS) for a mobile communication system are provided. The UE divides a plurality of uplink radio resources into at least one group and determines whether there exist pieces of uplink information corresponding to the uplink radio resources. When the corresponding pieces of the uplink information exist, the UE determines whether there exist overlapped periods in the time domain among the corresponding uplink radio resources. For any two of the corresponding uplink radio resources having the overlapped period, the UE decides how to transmit the corresponding pieces of uplink information based on whether the two of the corresponding uplink radio resources belonging to the same group or not, whether the corresponding pieces of uplink information can be jointly transmitted or not, and the priorities of the uplink information.