Sidelink Grant Pro-Scheduler for 5G Resource Conflict Avoidance
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in managing sidelink communication resources efficiently, leading to congestion and interference among user equipment (UEs) due to the lack of effective resource reservation and scheduling mechanisms.
Innovation Solution
Implementing a method where a central scheduler designates resources for sidelink communications, using sidelink grant messages with higher priority to reserve resources for subsequent transmissions, and allowing UEs to select resources that avoid overlaps, thereby reducing congestion and improving spectrum utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UEs autonomously select sidelink resources without centralized scheduling, then device complexity and scheduling flexibility are reduced, but resource conflicts and interference increase leading to congestion
Solution Approach 1:
A central scheduler (which can be a base station or a designated UE) acts as an intermediary to coordinate sidelink resource allocation. The scheduler receives scheduling requests from UEs, determines appropriate resources, and sends grant messages back to UEs. This intermediary approach resolves the contradiction by providing centralized coordination to avoid resource conflicts while maintaining the flexibility of UE-initiated scheduling requests.
Solution Approach 2:
The central scheduler performs preliminary resource allocation before actual sidelink transmissions occur. By pre-assigning resources through grant messages and implementing resource reservation mechanisms, the system prevents resource conflicts before they happen. This preliminary action ensures reliable resource allocation while maintaining scheduling flexibility through the grant-based approach.
2Reliability
If centralized scheduling is implemented to manage resources, then resource allocation efficiency and interference reduction improve, but system complexity and scheduling overhead increase
Solution Approach 1:
The scheduling function is extracted from individual UEs and centralized in a dedicated scheduler entity. This extraction allows the scheduling complexity to be concentrated in one location rather than distributed across all UEs, improving resource allocation efficiency through centralized coordination while managing overall system complexity by having a single scheduling brain.
Solution Approach 2:
The central scheduler is designed to handle multiple functions: receiving scheduling requests from multiple UEs, determining resource allocations, sending grant messages, and managing resource reservations. This multi-functional design improves resource allocation efficiency through a unified scheduling mechanism while avoiding the need for separate scheduling systems for each function.
3Reliability
If resource reservation for subsequent grant transmissions is implemented, then scheduling reliability and interference avoidance improve, but signaling overhead and message size increase
Solution Approach 1:
The resource reservation information for subsequent grant transmissions is merged into the current grant message. Instead of sending separate reservation messages, the scheduler includes reservation details (such as reserved resource indicators) within the existing grant structure. This combining approach improves scheduling reliability by ensuring reservation information is transmitted alongside the grant while minimizing additional signaling overhead by reusing the message framework.
Data Source
AI summary
This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for a UE scheduling grant based on a pro-scheduler implementation. A first UE may transmit a first sidelink grant transmission to a second UE with a resource reservation for a second sidelink grant transmission from the first UE. The second UE may select a sidelink resource that avoids an overlap with the resource reservation for the sidelink grant transmission from the first UE and transmit a sidelink transmission using the sidelink resource that avoids the overlap with the resource reservation. In further aspects, the second UE may transmit a sidelink transmission based on the first sidelink grant.