SDAP Reconfiguration via State Transition in Sidelink
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G NR systems, the reconfiguration of Service Data Adaptation Protocol (SDAP) entities for sidelink communication is challenging, particularly during state transitions or when a user equipment (UE) leaves a certain state or area, as existing protocols lack efficient mechanisms for managing quality of service (QoS) flow mappings and adaptations.
Innovation Solution
A method for a wireless device to receive QoS flow to data radio bearer (DRB) mapping information from a network in a connected state, and upon transitioning to a different state, the device continues using the existing QoS flow to DRB mapping for a specified duration or until a new configuration is received, allowing for seamless SDAP entity reconfiguration and adaptation in sidelink communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SDAP reconfiguration is performed during state transition, then service quality and reliability are maintained, but system complexity and reconfiguration overhead increase
Solution Approach 1:
The network stores QoS flow to DRB mapping information before state transition occurs. When the UE transitions states, it retrieves the pre-stored mapping information, avoiding the need for complex real-time reconfiguration and maintaining service continuity
Solution Approach 2:
The UE creates a copy of the QoS flow to DRB mapping information from the network and stores it locally. This local copy enables the UE to maintain service quality during state transitions without requiring continuous network interaction, reducing reconfiguration overhead
2Duration of action of stationary object
If QoS flow to DRB mapping is maintained during state transition, then service continuity is ensured, but adaptability to new network conditions decreases
Solution Approach 1:
The system implements dynamic QoS flow to DRB mapping where the mapping can be maintained during state transition but is also adaptable to new network conditions. The UE can update the mapping information when returning to connected state, allowing both service continuity and adaptability
Solution Approach 2:
The network provides QoS flow to DRB mapping information in advance before state transition. This preliminary provision ensures service continuity during transition while allowing the UE to adapt to new conditions by receiving updated mapping information after transition
Data Source
AI summary
A method and apparatus for service data adaptation protocol (SDAP) reconfiguration based on state transition in sidelink communication is provided. A first wireless device receives, from a network in a connected state, information on quality of service (QoS) flow to data radio bearer (DRB) mapping, and upon leaving the connected state, keeps using the QoS flow to DRB mapping for a time duration until a new QoS flow to DRB mapping is used.