Sidelink Resource Re-Selection for 5G V2X Interference
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Solution Overview
Problem
In 5G NR sidelink V2X communication, Mode 2 resource allocation can lead to resource conflicts due to interference from other transmitting UEs, resulting in failed responses and inefficient resource utilization.
Innovation Solution
A method and user equipment (UE) for sidelink communication that maintains a counter for periodic reservations and re-selects sidelink resources when specific resource re-selection conditions are met, such as continuous failure to receive responses, to ensure efficient resource allocation and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Mode 2 resource allocation is used for sidelink communication, then resource allocation flexibility is improved, but resource conflict and interference increase
Solution Approach 1:
The patent implements a feedback mechanism where the transmitting UE monitors for HARQ acknowledgments from the peer receiving UE. Based on whether ACK or NACK is received, the transmitting UE adjusts its resource selection strategy. This feedback loop enables dynamic adaptation to channel conditions and interference levels, resolving the contradiction between allocation flexibility and conflict reduction.
Solution Approach 2:
The patent introduces dynamic resource re-selection mechanisms where the UE can change its reserved resources based on monitoring outcomes. The resource re-selection timer and counter mechanisms allow the system to transition from static resource reservation to dynamic adjustment, maintaining flexibility while avoiding persistent conflicts through adaptive behavior.
2Productivity
If periodic resource reservations are maintained for sidelink transmission, then communication efficiency is improved, but resource conflicts with other UEs increase
Solution Approach 1:
The patent employs periodic resource reservations where UEs allocate resources at regular intervals based on a configured period. This periodic structure provides communication efficiency through predictable resource availability while the associated timer and counter mechanisms enable periodic reassessment and re-selection, preventing persistent conflicts.
Solution Approach 2:
The patent changes resource parameters dynamically by re-selecting time-frequency resources when conflicts are detected. The system modifies reservation parameters such as resource indices and timing based on monitored interference and HARQ feedback, maintaining communication efficiency while adapting to changing channel conditions and reducing conflicts.
3Object-affected harmful factors
If resource re-selection is performed frequently to avoid conflicts, then interference reduction is improved, but resource allocation stability deteriorates
Solution Approach 1:
The patent implements preliminary resource reservation where UEs select and reserve resources in advance before actual transmission occurs. This preliminary action provides stability by establishing resource allocations ahead of time while the system retains the capability to perform re-selection if conflicts are detected, balancing stability with interference avoidance.
Solution Approach 2:
The patent introduces dynamic elements through resource re-selection timers and counters that control when re-selection occurs. These mechanisms create a balanced dynamic system where resources remain stable during normal operation but can be re-selected when necessary, preventing both excessive re-selection and persistent conflicts.
4Device complexity
If sidelink resources are allocated without response monitoring, then resource allocation simplicity is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements feedback monitoring through HARQ acknowledgment detection. The transmitting UE monitors for ACK/NACK responses from the peer receiving UE to determine whether transmitted data was successfully received. This feedback mechanism improves resource utilization efficiency by enabling re-transmission decisions while maintaining relatively simple allocation procedures.
Solution Approach 2:
The patent enables self-service through autonomous resource management where the UE independently monitors its own resource allocations and makes re-selection decisions based on received feedback. This self-service approach improves resource utilization efficiency without requiring complex network-controlled allocation, maintaining simplicity while enhancing efficiency.
Data Source
AI summary
A method for sidelink communication is provided. The method is applied to a first UE in a sidelink communication to transmit signals to a second UE which is a peer receiving (peer-Rx) UE of the first UE. The method includes the following steps: maintaining a counter to record how many periodic reservations remain to be used for sidelink signal transmission, wherein the periodic reservations are associated with a reservation period and each periodic reservation is associated with at least one sidelink resource; determining whether a resource re-selection condition is met before the counter counts to 0, wherein the resource re-selection condition is associated with status of receiving responses corresponding to a subset of the sidelink resources; and reselectting at least one new sidelink resource for next periodic reservations when the resource re-selection condition is met.