Control Information Prioritization Under Uplink and Sidelink Limits
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Solution Overview
Problem
In device-to-device (D2D) and vehicle-to-everything (V2X) systems, the overheads of control information exceed the channel capacity, leading to potential loss of important control information when terminals randomly determine what to send.
Innovation Solution
A method for determining control information based on a priority rule to select L pieces from M pieces, prioritizing certain types of control information for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink control information is repeatedly transmitted in multiple slots to enhance coverage, then coverage is improved, but uplink control information feedback timing becomes uncertain and resource waste occurs
Solution Approach 1:
The downlink control information transmission is segmented into multiple slots with predetermined relationships, allowing the terminal to identify the first slot containing DCI format 1_0 with the shortest slot duration. This segmentation enables deterministic feedback timing while maintaining coverage enhancement through repeated transmission across multiple slots.
Solution Approach 2:
The network pre-configures multiple downlink control information transmission slots with predetermined relationships before actual data transmission. This preliminary action allows the terminal to know in advance which slot to monitor for DCI format 1_0 and when to provide feedback, eliminating timing uncertainty while maintaining coverage enhancement.
2Reliability
If downlink control information is transmitted in multiple slots for coverage enhancement, then coverage is improved, but control resource elements are wasted due to incomplete or redundant transmissions
Solution Approach 1:
The invention extracts and identifies only the first slot containing DCI format 1_0 with the shortest slot duration from the multiple transmitted slots. The terminal processes only this identified slot for uplink control information feedback, extracting the essential control information while discarding redundant transmissions, thereby eliminating control resource waste while maintaining coverage enhancement benefits.
Solution Approach 2:
Instead of processing all transmitted downlink control information slots, the terminal performs partial action by selecting and processing only the first slot with DCI format 1-0. This partial processing approach reduces control resource consumption while maintaining the coverage enhancement effect achieved through multiple transmissions.
3Reliability
If the terminal monitors multiple physical downlink control channels to ensure reception, then reliability is improved, but terminal complexity and power consumption increase
Solution Approach 1:
The invention applies local quality by directing the terminal to focus monitoring efforts on a specific local characteristic: the first slot containing DCI format 1-0 with the shortest slot duration. Instead of uniformly monitoring all slots with equal complexity, the terminal applies targeted monitoring to the identified slot, reducing overall monitoring complexity while maintaining reception reliability.
Solution Approach 2:
The network provides feedback information indicating which slot contains DCI format 1-0, allowing the terminal to adjust its monitoring strategy accordingly. This feedback mechanism enables the terminal to reduce monitoring complexity by focusing only on the relevant slot identified by the network, while still ensuring reliable reception through targeted monitoring.
Data Source
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AI summary
This application provides a control information sending method, including: A terminal apparatus determines L pieces of control information from M pieces of control information based on a priority rule, where the M pieces of control information include M1 pieces of uplink control information and M2 pieces of sidelink control information, types of the M1 pieces of uplink control information include at least one of a hybrid automatic repeat request, a scheduling request, and channel state information, types of the M2 pieces of sidelink control information include at least one of a sidelink hybrid automatic repeat request, a sidelink scheduling request, and sidelink channel state information, M is a positive integer greater than or equal to 2, M1 is an integer greater than or equal to 0, M2 is a positive integer greater than or equal to 1, and L is an integer greater than or equal to 0 and less than or equal to M; and the terminal apparatus sends the L pieces of control information. This application provides a control information sending and receiving method, so that a terminal apparatus sends control information with a relatively high priority based on a priority rule.