Relay UE Path Switching via Adaptation Layer PDU
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently supporting direct to indirect communication path switching in wireless communication systems, particularly in scenarios where a relay UE is needed to facilitate communication between a remote UE and the network when the remote UE cannot access the network directly.
Innovation Solution
The implementation of a method where a relay UE establishes a Radio Resource Control (RRC) connection with a network node, transmits its Layer 2 Identity (L2ID), receives a local UE Identity for a remote UE, and establishes a PC5 connection with the remote UE, allowing for the transmission of RRC Reconfiguration Complete messages within an adaptation layer Protocol Data Unit, with the local UE ID included in the header for proper identification and communication path switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay UE is introduced to facilitate communication between remote UE and the network, then network accessibility for remote UEs is improved, but device complexity and protocol management overhead increase
Solution Approach 1:
The relay UE acts as an intermediary between the remote UE and the network node. It establishes separate connections with both parties, receiving RRC messages from the network node and forwarding them to the remote UE via the PC5 interface, while also relaying messages from the remote UE back to the network node. This mediator approach enables network accessibility for remote UEs without direct network connection while managing the complexity through standardized relay protocols.
Solution Approach 2:
The communication path is segmented into two separate connections: a Uu interface connection between the relay UE and the network node, and a PC5 interface connection between the relay UE and the remote UE. This segmentation allows each connection to be managed independently with appropriate protocols, reducing overall system complexity while improving network accessibility for remote UEs.
2Productivity
If direct communication path is used between remote UE and network, then communication efficiency is improved, but network accessibility is reduced for UEs out of direct coverage
Solution Approach 1:
The system dynamically switches between direct communication path (when available) and indirect relay path (when direct coverage is unavailable). The relay UE establishes and maintains readiness to provide indirect communication services, allowing the system to adapt to changing coverage conditions and optimize both communication efficiency and network accessibility based on real-time requirements.
Solution Approach 2:
The relay UE serves as a dynamic intermediary that can be activated when direct communication is not possible. It provides on-demand relay services to extend network coverage to remote UEs outside direct network coverage, thereby improving network accessibility without compromising the efficiency of direct communications when available.
3Reliability
If relay UE manages identity and configuration for remote UE, then communication path switching reliability is improved, but information management complexity increases
Solution Approach 1:
The relay UE acts as an information intermediary that receives identity and configuration information from the network node and manages it locally. It maintains the local UE identity for the remote UE and uses this information to properly route and manage communication paths between the remote UE and the network, improving switching reliability while managing information complexity through structured identity management.
Solution Approach 2:
The relay UE receives and stores the local UE identity and configuration information in advance from the network node before actual communication path switching is needed. This preliminary action ensures that all necessary identity information is readily available when path switching occurs, improving reliability while reducing the complexity of real-time information management during critical switching operations.
Data Source
AI summary
A method and device are disclosed from the perspective of a relay UE. In one embodiment, the relay UE establishes a Radio Resource Control (RRC) connection with a network node. The relay UE also transmits a Layer 2. Identity (L2ID) of the relay UE to the network node. Furthermore, the relay UE receives a local UE Identity (ID) for a remote UE and a L2ID of the remote UE from the network node. In addition, the relay UE establishes a PC5 connection with the remote UE. The relay UE further receives a first RRC Reconfiguration Complete message from the remote UE. The relay UE also transmits the first RRC Reconfiguration Complete message to the network node, wherein the first RRC Reconfiguration Complete message is included in an adaptation layer Protocol Data Unit (PDU) for transmission and the local UE ID for the remote UE is included in a header of the adaptation layer PDU.