Sidelink Resource Allocation via Base Station Feedback in NR V2X
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Solution Overview
Problem
In wireless communication systems, particularly in sidelink communication, there is a challenge with resource allocation when the number of symbols in sidelink slots changes, leading to potential resource shortages and reliability issues due to overlapping transmission resources between User Equipments (UEs).
Innovation Solution
A method where a first device establishes a sidelink communication session with a second device, transmits assistance information to a base station, and receives resource information to manage resource allocation effectively, even with varying numbers of symbols in sidelink slots, thereby preventing resource overlap and ensuring efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station allocates sidelink resources to multiple UEs independently, then resource allocation efficiency is improved, but resource overlap between UEs occurs leading to transmission conflicts
Solution Approach 1:
The patent implements a feedback mechanism where UEs report their sidelink resource usage and channel conditions to the base station. The base station uses this feedback information to adjust resource allocations dynamically, preventing overlaps while maintaining high allocation efficiency. The feedback loop enables continuous optimization of resource distribution based on actual transmission conditions.
Solution Approach 2:
The base station acts as an intermediary that coordinates resource allocations between multiple UEs. By centralizing the resource allocation decision-making process and using assistance information from UEs, the base station mediates potential conflicts before they occur, ensuring that resource assignments to different UEs do not overlap while maintaining efficient utilization.
2Quantity of substance
If the number of symbols in sidelink slots is increased to provide more transmission resources, then communication capacity is improved, but resource overlap probability increases leading to conflicts
Solution Approach 1:
The patent employs dynamic resource allocation where the number of symbols allocated to each UE's sidelink slot is adjusted based on real-time channel conditions and traffic requirements. Rather than using fixed symbol allocations that increase overlap probability, the system dynamically optimizes the symbol count for each UE, providing sufficient communication capacity while avoiding resource conflicts through adaptive adjustment.
Solution Approach 2:
The system changes key parameters such as the number of symbols, resource block allocations, and time-frequency positions based on assistance information received from UEs. By dynamically modifying these parameters rather than using static allocations, the system maintains high communication capacity while adapting to prevent resource overlap and transmission conflicts.
3Loss of time
If sidelink communication is established without base station coordination, then communication latency is reduced, but resource conflicts increase causing transmission failures
Solution Approach 1:
The patent implements preliminary resource coordination where the base station pre-allocates or pre-coordinates sidelink resources among UEs before actual data transmission begins. This preliminary action establishes a resource framework that prevents conflicts during actual transmission, maintaining low latency while ensuring transmission reliability through advance planning and coordination.
Data Source
AI summary
Provided are a method for performing wireless communication by a first device, and an apparatus for supporting same. The method may comprise the steps of: establishing a first session for SL communication with a second device; transmitting auxiliary information relating to the SL communication to a base station; and receiving information on a resource relating to the SL communication from the base station.