Sidelink Resource Selection Window for Aperiodic Traffic Collisions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sidelink communication systems face challenges in selecting resources for reliable communication, particularly in power-constrained devices like smartphones and wearables, due to unpredictable aperiodic traffic patterns and limited processing power, leading to inefficiencies in resource allocation and increased collision risks.
Innovation Solution
A method for sidelink resource selection that includes determining a resource selection window (RSW) and contiguous partial sensing window, ensuring sufficient candidate resources and channel sensing results by adjusting the RSW based on thresholds and priority criteria to minimize collisions and optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If terminal devices perform sidelink communication without network coverage, then communication continuity is improved, but communication reliability deteriorates due to inability to synchronize with network time
Solution Approach 1:
The terminal device performs time synchronization with the network before entering coverage-less operation. The device obtains system frame number (SFN) and offset information from the network before disconnecting, then uses this pre-obtained timing information to maintain synchronized operation during the coverage-less period, ensuring both continuity and reliability.
Solution Approach 2:
The patent introduces an intermediary mechanism where the terminal device uses previously obtained network timing information (SFN and offset) as a reference to maintain synchronization during coverage-less operation. This intermediary timing reference allows the device to bridge the gap between network-connected and coverage-less states, maintaining communication reliability without continuous network contact.
2Use of energy by moving object
If terminal devices use discontinuous reception (DRX) to save energy, then energy efficiency is improved, but communication response time deteriorates due to periodic wake-up requirements
Solution Approach 1:
The patent makes the DRX configuration dynamic by allowing different DRX parameters (cycle lengths, wake-up timings) for different communication scenarios and services. The terminal can adaptively adjust its wake-up schedule based on service requirements, maintaining energy efficiency while ensuring timely response for urgent communications through configurable short DRX cycles or immediate wake-up triggers.
Solution Approach 2:
The system changes DRX parameters dynamically based on communication needs. Different DRX cycle configurations are applied depending on service type, channel conditions, and QoS requirements. This parameter adjustment allows the system to optimize between energy saving and response time, switching between aggressive DRX for background traffic and lighter DRX or continuous monitoring for time-sensitive services.
3Productivity
If terminal devices connect to multiple networks simultaneously for load balancing, then service quality is improved, but device complexity increases due to multiple time synchronization requirements
Solution Approach 1:
The patent implements a universal time synchronization mechanism that handles multiple network connections through a unified approach. The terminal maintains a single reference time source and applies offset adjustments for different networks, rather than maintaining separate synchronization systems for each network. This multi-functional synchronization framework reduces device complexity while enabling load balancing across multiple networks.
Solution Approach 2:
The synchronization system is segmented into a master reference time source and network-specific offset adjustments. The terminal divides the synchronization task by maintaining one primary time reference and applying separate correction offsets for each connected network, rather than implementing independent synchronization for each network. This segmentation simplifies the overall synchronization complexity while maintaining service quality across multiple networks.
Data Source
Figure 1~2
Figure 3
Figure 4~6
AI summary
Embodiments of methods and devices for sidelink communication are disclosed. In an example, a first terminal device acquires an indication for triggering a resource selection procedure for aperiodic transmission at a first time position. The first terminal device determines a resource selection window (RSW) after the first time position, where the RSW includes a time window for resource selection and at least part of a contiguous partial sensing (CPS) monitoring window. The first terminal device further performs the resource selection procedure based on the time window for resource selection as determined.