Sidelink Resource Reservation With Collision Feedback
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Solution Overview
Problem
Existing communication systems face challenges in reducing resource collisions and improving resource selection efficiency and reliability in sidelink communications between devices, particularly when selecting resources for direct device-to-device communication without a base station.
Innovation Solution
Devices employ methods to determine potential resource collisions by analyzing reference signal received power and sending collision messages to adjust resource reservations, utilize preferred and non-preferred resource lists, and apply periodic and contiguous partial sensing to optimize resource selection for aperiodic transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If devices use sidelink transmissions to communicate directly without a base station, then communication flexibility and autonomy are improved, but resource collision probability increases
Solution Approach 1:
The patent implements preliminary resource sensing and reservation mechanisms where devices perform partial sensing in advance to identify available resources before actual transmission. The first device senses resources in a first set of slots and second device senses in a second set of slots, with overlapping sensing periods allowing both devices to prepare resource selections before collision occurs, thereby reducing collision probability while maintaining direct communication flexibility
Solution Approach 2:
The patent employs feedback mechanisms where devices transmit collision messages to indicate resource conflicts. When a device detects a collision or potential collision during sensing, it sends feedback information to the other device, enabling resource reallocation. This feedback loop continuously monitors resource usage and adjusts selections dynamically, maintaining communication flexibility while improving reliability through adaptive resource management
2Reliability
If devices perform comprehensive resource sensing to improve selection accuracy, then resource selection reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies partial sensing rather than comprehensive sensing across all possible resources. Each device performs sensing only in specific sets of slots (first set for first device, second set for second device) that are sufficient for collision detection. This partial action approach provides adequate reliability for resource selection while significantly reducing the total sensing time and power consumption compared to full-spectrum monitoring
Solution Approach 2:
The patent implements periodic sensing in defined time windows rather than continuous sensing. Devices sense resources during designated periods (first time window for first device, second time window for second device) and then pause sensing during transmission or non-critical periods. This periodic action maintains sufficient selection accuracy through regular updates while dramatically reducing average power consumption compared to continuous resource monitoring
3Reliability
If devices use collision messages to resolve resource conflicts, then resource allocation reliability is improved, but communication latency increases
Solution Approach 1:
The patent performs collision detection and message exchange within predetermined time windows that start before the actual resource allocation is needed. By initiating the sensing and potential collision message exchange in advance (first time window and second time window), the system resolves conflicts before the critical transmission moment, minimizing latency impact while ensuring reliable resource allocation
Solution Approach 2:
The patent implements dynamic time window adjustments where the sensing and message exchange periods adapt based on detected conditions. When no collisions are detected, devices can proceed more quickly to transmission. When collisions are detected, the system dynamically extends the resolution process within the time windows. This dynamic approach maintains reliability by resolving conflicts when needed while minimizing overall latency by avoiding unnecessary delays in collision-free scenarios
Data Source
AI summary
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for communications between user equipment. One of the methods includes receiving, by a first device and from a second device, sidelink control information indicating a resource reservation for a single-slot resource for the second device to use to communicate with the first device; determining, by the first device and based at least in part on the sidelink control information, whether a potential resource collision exists when the first device is scheduled to communicate with another device using the single-slot resource or when the single-slot resource is reserved by another device; and in response to determining that the potential resource collision exists, sending, by the first device and within a predetermined number of slots from a reference slot, a collision message to cause the second device to determine another single-slot resource to use to communicate with the first device.