Uplink Resource Selection via DCI for Low-Latency URLLC
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Solution Overview
Problem
In 5G communication systems, ensuring ultra-reliable and low-latency communication (URLLC) is challenging due to difficulties in timely transmission of uplink information using pre-indicated resources, particularly in carrier aggregation scenarios involving different frequency ranges (FR1 and FR2), which affects reliability and latency.
Innovation Solution
A method and apparatus for determining uplink resources based on downlink control information (DCI) to minimize latency by setting a first processing duration, considering subcarrier spacing (SCS) and feedback duration, and dynamically selecting carriers for uplink channels to ensure timely transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pre-indicated uplink resources are used in carrier aggregation scenarios, then system capacity is increased, but transmission latency increases and reliability deteriorates
Solution Approach 1:
The patent implements dynamic resource allocation where the terminal device determines uplink channel resources based on received DCI rather than using pre-indicated resources. The feedback duration is dynamically calculated based on processing duration and subcarrier spacing, allowing the system to adapt resource allocation to current channel conditions and processing capabilities, thereby reducing latency while maintaining system capacity
Solution Approach 2:
The patent changes the parameter of resource allocation timing by introducing feedback duration calculation that considers processing duration and subcarrier spacing. By adjusting the timing parameter based on these factors, the system optimizes the balance between system capacity and transmission latency for URLLC services
2Ease of manufacture
If pre-indicated uplink resources are used, then resource allocation is simplified, but transmission reliability deteriorates
Solution Approach 1:
The patent introduces a feedback mechanism where the terminal device receives DCI and determines uplink resources based on processing duration and feedback duration calculations. This feedback-based resource determination ensures that uplink transmissions are scheduled at appropriate times considering device processing capabilities, thereby improving transmission reliability while maintaining reasonable allocation complexity
3Reliability
If processing duration is extended to ensure reliable processing, then transmission reliability is improved, but latency increases
Solution Approach 1:
The patent changes the timing parameter by calculating feedback duration based on processing duration and subcarrier spacing. This parameter adjustment allows the system to optimize the balance between processing reliability and latency, ensuring sufficient processing time while minimizing delays for URLLC services
Data Source
AI summary
A resource determining method and an apparatus are disclosed. A network device determines a resource of an uplink channel. A terminal device receives downlink control information (DCI) sent by the network device, where the DCI is carried on a physical downlink control channel (PDCCH). The terminal device determines the resource of the uplink channel based on the DCI, where the resource of the uplink channel is used to send uplink information. As a result, a latency of sending the uplink information is reduced.