Inter-UE Coordination Sidelink Control Information Format
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Solution Overview
Problem
Existing wireless communication systems face challenges in avoiding resource collisions between user equipment (UEs) when both select the same resource for transmission during the same time, leading to inefficiencies and potential data loss.
Innovation Solution
The implementation of a new sidelink control information (SCI) format for inter-UE coordination (IUC) allows UEs to communicate directly via sidelink interfaces, enabling them to request and share resource information to avoid resource collisions. This includes specifying resources used for transmission within a time window and using a format indicator to distinguish between request and response messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs independently select resources for transmission without coordination, then device complexity and communication overhead are reduced, but resource collisions occur leading to data loss and reduced reliability
Solution Approach 1:
The patent applies preliminary action by having UEs exchange resource selection information before actual transmission occurs. The first UE sends SCI messages indicating its selected resources, and the second UE uses this information to make informed resource selections that avoid collisions, preventing conflicts before they happen.
Solution Approach 2:
The patent uses SCI (Sidelink Control Information) messages as an intermediary mechanism between UEs. These messages carry resource selection information and act as a mediator that enables coordinated resource allocation without requiring direct complex negotiation or centralized control.
2Productivity
If UEs use existing resource selection methods without inter-UE coordination, then communication overhead is minimized, but resource collisions lead to data loss and reduced communication efficiency
Solution Approach 1:
The patent implements feedback by having the first UE send SCI messages with resource selection information to the second UE. This feedback loop enables the second UE to adjust its resource selection based on the first UE's choices, preventing collisions and improving overall communication efficiency while minimizing data loss.
3Speed
If UEs implement direct sidelink communication for resource coordination, then communication speed and response time are improved, but device complexity and protocol overhead increase
Solution Approach 1:
The patent applies universality by designing SCI messages that serve multiple functions: they convey resource selection information, enable collision avoidance, and maintain backward compatibility with existing LTE sidelink protocols. This multi-functionality approach improves coordination speed without proportionally increasing complexity.
Data Source
AI summary
A user equipment including a transceiver and a processor is disclosed. The processor is configured to determine a sidelink control information (SCI) format payload size based on resource pool configuration for the UE for inter-UE coordination with a second UE. The processor is configured to determine, based on the determined SCI format payload size, an SCI format including a number of message elements identifying attributes of a number of resources being used by the UE over a predetermined time period. The processor is configured to encode and transmit, to the second UE, the SCI format for the IUC for resource selection by the second UE.