V2V Resource Energy Determination for Collision Avoidance
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Solution Overview
Problem
In vehicle-to-vehicle (V2V) communications, the half-duplex communication limitation leads to reduced system resource utilization and increased resource selection collisions, as user equipment (UE) cannot measure data transmission resources during data transmission, resulting in unused resources and increased collisions during resource selection.
Innovation Solution
The method involves obtaining time-frequency resource indication information and resource cycle reservation information from another UE, allowing the first UE to determine the energy of available resources, even in transmission periods where data is sent, thereby improving resource utilization and reducing selection collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE uses half-duplex communication to send data, then data transmission is achieved, but resource measurement capability is lost during transmission
Solution Approach 1:
The UE performs resource energy measurement on the first resource before data transmission in the sensing window. This preliminary measurement allows the UE to have energy information available before the half-duplex constraint prevents further measurement during transmission.
Solution Approach 2:
The UE applies the measured energy value of the first resource to multiple second resources that have the same time-frequency domain location in different transmission periods. This creates equipotentiality where one measurement serves multiple resource selection decisions across different time periods.
2Object-affected harmful factors
If UE excludes resources with high energy values, then interference is reduced, but system resource utilization decreases
Solution Approach 1:
The UE determines energy values for resources in future transmission periods by referencing measurements from the sensing window, even when those resources have the same time-frequency location as transmitted data. This allows resources to be considered for selection despite the half-duplex constraint, improving utilization while maintaining interference avoidance through proper energy threshold evaluation.
3Productivity
If UE selects resources based on sensing results, then resource selection efficiency is improved, but resource selection collisions increase due to reduced available resources
Solution Approach 1:
The UE performs energy measurement and resource evaluation in advance during the sensing window before actual data transmission. This preliminary action provides a broader set of evaluated resources for selection, reducing collisions by having more pre-assessed options available when transmission resources are selected.
Solution Approach 2:
The UE extends resource energy evaluation to include second resources in future transmission periods that share the same time-frequency domain location as measured first resources. This expands the effective resource pool for selection by treating equivalent time-frequency locations across different periods as having comparable energy characteristics.
Data Source
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AI summary
Embodiments of the present invention relate to the field of vehicle to vehicle communications technologies, and provide a resource energy determining method and apparatus, to resolve prior-art problems that system resource utilization is reduced, and that a resource selection collision easily occurs. The method includes: obtaining, by first UE, time-frequency resource indication information and resource cycle reservation information of second UE in a sensing time window of the first UE; determining, by the first UE, energy of a first resource based on the time-frequency resource indication information of the second UE; and determining, by the first UE, energy of at least one second resource based on the energy of the first resource and the resource cycle reservation information of the second UE, where a time-frequency domain location of the first resource in a transmission period in which the first resource is located is the same as a time-frequency domain location of each of the at least one second resource in a transmission period in which the second resource is located.