Sidelink Handover Coordination Across Distributed Base Stations
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Solution Overview
Problem
Distributed base stations face challenges in supporting sidelink configurations, particularly during handovers and dual connectivity scenarios involving different radio access technologies, as the central unit cannot effectively manage these operations.
Innovation Solution
A distributed base station's central unit receives UE information related to sidelink communications and determines the need for radio resource utilization at a target node, providing necessary information to configure sidelink operations concurrently with handover or cell change procedures, ensuring seamless integration of sidelink configurations across different cells and technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the central unit manages sidelink configurations during handover and dual connectivity scenarios, then communication reliability is improved, but the system complexity increases
Solution Approach 1:
The base station is divided into a central unit and distributed units, where the central unit manages high-level coordination of sidelink configurations during handover and dual connectivity, while distributed units handle local radio resource allocation. This segmentation reduces the complexity burden on any single component while maintaining overall system reliability.
Solution Approach 2:
The central unit acts as an intermediary that receives sidelink configuration requests from UEs, coordinates with target nodes during handover procedures, and ensures seamless transition of sidelink resources. This intermediary role enables reliable management of complex scenarios without requiring each component to handle all processing details independently.
2Stability of the object's composition
If sidelink information is transmitted to the target node during handover, then sidelink configuration continuity is improved, but the handover time increases
Solution Approach 1:
The central unit prepares and transmits sidelink information to the target node in advance during the handover preparation phase, before the actual handover execution. This preliminary action ensures that the target node is ready to receive and configure sidelink resources immediately, maintaining continuity while minimizing the impact on handover timing.
Solution Approach 2:
The system maintains continuous management of sidelink configurations throughout the handover process by keeping the central unit actively involved in coordinating with target nodes. This ensures that sidelink resources are allocated and configured without interruption, preserving the usefulness of the action while managing the time required for coordination.
3Adaptability or versatility
If the central unit coordinates dual connectivity operations with different radio access technologies, then adaptability is improved, but the management complexity increases
Solution Approach 1:
The central unit is designed with universal functionality to handle multiple radio access technologies (NR, EUTRA, TDD-HSPA, FDD-HSPA) within a single unified management framework. This multi-functional approach enables the central unit to coordinate dual connectivity scenarios across different RATs without requiring separate specialized management mechanisms for each technology.
Solution Approach 2:
The system manages different radio access technologies by dynamically adjusting configuration parameters and communication protocols based on the specific RAT being used. The central unit adapts its management approach by changing parameters such as signaling messages, resource allocation methods, and coordination protocols to match the requirements of each RAT, thereby achieving versatility without proportionally increasing complexity.
Data Source
AI summary
A method of obtaining sidelink configuration in a CU of a distributed base station includes receiving sidelink information related to sidelink communications at a UE operating in a first cell (1602); initiating handover procedure or a cell change procedure so that the UE utilizes a radio resource on a second cell associated with a target node, the target node corresponding to a DU of the distributed base station or another base station (1604); transmitting, to the target node, a request to set up a context for the UE, the request including the sidelink information (1606); and receiving, from the target node, a response to the request, the response including a sidelink configuration for the UE (1608).