NR V2X Terminal Resource Selection Adaptability
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Solution Overview
Problem
In NR V2X communication, reserving resources in a fixed period is inadequate to meet the requirements due to the presence of periodic services with variable packet sizes and aperiodic services that demand shorter delays, making it difficult to ensure reliable data packet transmission and efficient resource utilization.
Innovation Solution
A resource selection method for terminals that allows the selection of transmission resources from periodically reserved, sensing window-based, or randomly selected resources, ensuring that the resource allocation mechanism can accommodate periodic, variable, and aperiodic services by adjusting the sensing windows and resource reservation periods based on packet requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resources are reserved in a fixed period (20 ms) as in LTE V2X, then periodic services with fixed packet size can be supported, but periodic services with variable packet size and aperiodic services with short delay requirements cannot be met
Solution Approach 1:
The patent applies dynamics by making the resource reservation period adjustable rather than fixed. The terminal can dynamically select different resource reservation periods (e.g., 20 ms, 40 ms, 80 ms, or other values) based on the specific service requirements. This allows the system to adapt to both periodic services with fixed packet sizes (using longer periods) and aperiodic services with short delay requirements (using shorter periods), thereby resolving the contradiction between service adaptability and transmission delay.
Solution Approach 2:
The patent changes the parameter of resource reservation period from a fixed value to a variable that can be selected based on service characteristics. By allowing the terminal to choose different reservation periods and sensing window configurations, the system can optimize resource allocation for different service types - using longer periods for stable periodic traffic and shorter periods for time-sensitive aperiodic traffic, thus improving both adaptability and reducing delay.
2Ease of operation
If resources are reserved periodically in advance, then resource allocation is simple and predictable, but resource waste increases when packet sizes vary or transmissions are not needed
Solution Approach 1:
The patent enables dynamic adjustment of resource reservation parameters including the reservation period and the number of reserved resources. The terminal can modify these parameters based on actual transmission needs, service type, and channel conditions. This allows the system to maintain simple periodic resource allocation while avoiding waste by adjusting the reservation quantity and frequency to match actual traffic patterns, thereby resolving the contradiction between operational simplicity and resource efficiency.
3Stability of the object's composition
If a fixed resource reservation period is used, then resource allocation is predictable and stable, but it cannot meet the varying delay requirements of different service types
Solution Approach 1:
The patent introduces dynamics into the resource allocation system by allowing the terminal to select different resource reservation periods based on service requirements. While maintaining the stability of periodic allocation structure, the system can adapt the period length (e.g., 20 ms for delay-tolerant services, shorter periods for time-sensitive services) to meet varying delay requirements, thus resolving the contradiction between allocation stability and delay performance.
4Reliability
If sensing windows are extended to improve resource selection accuracy, then resource allocation reliability increases, but system complexity and processing overhead increase
Solution Approach 1:
The patent allows dynamic adjustment of sensing window parameters including the sensing window length and the number of sensing opportunities. The terminal can configure these parameters based on service requirements, channel conditions, and device capabilities. This enables the system to achieve reliable resource allocation by extending sensing windows when needed while avoiding unnecessary complexity by using shorter windows when conditions permit, thus resolving the contradiction between reliability and system complexity.
Data Source
AI summary
The embodiments of the present disclosure provide a resource selection method and a terminal. The resource selection method includes determining a target transmission resource of a to-be-transmitted data packet, where the target transmission resource is selected from one of the following: a periodically reserved transmission resource obtained according to a sensing result of a first sensing window; a transmission resource obtained according to a sensing result of a second sensing window, where a start time of the second sensing window is or later than an arrival time of the data packet; and a randomly selected transmission resource.