Remote UE Network Control Layer via Relay for Core Context

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Solution Overview

Problem

In wireless communication systems, remote UEs connecting via relay UEs are not recognized by the core network, leading to a lack of control context and provisioning parameters, which hinders effective sidelink operations and session management.

Innovation Solution

Establish a network control layer in the protocol stack of both the UE and the core network when communicating via a relay UE, and provide control information through sidelink interfaces, using common provisioning parameters for out-of-coverage scenarios.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If remote UE connects to the wireless communication network via relay UE, then the remote UE can access the network despite being out of coverage, but the core network does not recognize the remote UE and lacks control context and provisioning parameters

Engineering Contradiction:

Improvenetwork access capabilityVSAvoidcontrol context

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The relay UE acts as an intermediary that forwards control information between the remote UE and the core network. The relay UE receives control information from the remote UE over the sidelink interface and forwards it to the core network, enabling the core network to establish control context for the remote UE indirectly through the relay UE

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The control information is segmented into different components: provisioning parameters are stored in the relay UE and forwarded to the core network, while control context is established separately at the core network. This segmentation allows the system to handle the complex information exchange required for remote UE recognition

Inventive Principle:

Principle #1Segmentation

2Reliability

If conventional provisioning parameters are used for sidelink operations, then the parameters are available in the UE, but they may be missing or outdated preventing proper sidelink operation

Engineering Contradiction:

Improvesidelink operation validityVSAvoidparameter management

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Provisioning parameters are pre-stored in the relay UE before the remote UE needs them. When the remote UE connects via the relay UE, the relay UE already has the necessary provisioning parameters ready to forward to the core network, eliminating the need for the remote UE to have these parameters locally and ensuring they are current and valid

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The relay UE automatically manages the provisioning parameters for the remote UE without requiring manual configuration or intervention. The relay UE retrieves, stores, and forwards the necessary parameters as part of the normal connection establishment process, making the parameter management transparent to the remote UE

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12543229B2Remote UE control information establishment at a core network

Publication Date: 2026.02.03 FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV

AI summary

A user device, UE, for a wireless communication system is described. The UE is to communicate with the wireless communication system via at least one relay UE, the UE and the relay UE communicating over a sidelink interface. When communicating with the wireless communication system via the relay UE, e.g., when starting and/or during a communication, the UE is to establish a network control layer in its protocol stack, and the network control layer is to provide some control information.