Remote UE Information Reporting for Relay Paging and Initial Signaling
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Solution Overview
Problem
In UE-to-network relay scenarios, relay UEs lack the local relay identifier of remote UEs, leading to issues with data transmission and reception, particularly when monitoring paging occasions, as they cannot establish Uu SRB layer entities for initial signaling.
Innovation Solution
Relay UEs report remote UE information to the base station, including Uu and PC5 interface identifiers, RRC states, and connection statuses, allowing the base station to assign local relay identifiers and configure Uu interface entities, ensuring reliable signaling and paging modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay UE forwards paging for remote UE, then remote UE can receive paging messages, but relay UE's data transmission and reception is affected
Solution Approach 1:
The base station determines the paging forwarding mode in advance based on reported information about the remote UE and relay UE configuration. This preliminary determination allows the relay UE to know whether it needs to monitor paging occasions or forward paging messages, avoiding conflicts with its own data transmission without requiring real-time coordination during actual paging events.
2Reliability
If relay UE transmits initial Uu signaling of remote UE, then remote UE can establish connection, but relay UE lacks local relay identifier to carry in signaling
Solution Approach 1:
The base station is pre-configured with mapping relationships between remote UE identifiers and relay UE identifiers before the relay communication starts. When the relay UE needs to transmit initial Uu signaling for a remote UE, it can directly use the pre-stored mapping relationship to include the correct local relay identifier, eliminating the need for real-time identifier resolution and ensuring connection establishment proceeds smoothly.
3Reliability
If base station assigns local relay identifier after relay UE reports remote UE information, then relay UE can identify remote UE on Uu interface, but initial signaling cannot be transmitted without identifier
Solution Approach 1:
The base station pre-configures mapping relationships between remote UE identifiers and local relay identifiers before the relay UE needs to transmit initial signaling. This allows the relay UE to immediately include the correct local relay identifier in its first signaling transmission without waiting for an interactive identifier assignment process, eliminating time loss while ensuring accurate remote UE identification.
4Reliability
If relay UE monitors paging occasion of remote UE, then paging can be received, but relay UE cannot distinguish its own paging from remote UE's paging
Solution Approach 1:
The base station pre-configures the relay UE with the remote UE's paging occasion and associated identifier mappings before paging events occur. When monitoring the paging occasion, the relay UE can immediately distinguish whether a paging message is intended for itself or for the remote UE by checking against the pre-configured identifier information, avoiding confusion without requiring additional signaling during the paging process.
Data Source
AI summary
Disclosed are a method for sending remote UE information, a method for receiving remote UE information, and a device. The method for sending remote UE information includes: sending, by a first relay UE, remote UE information to a base station, wherein the remote UE accesses the base station through the first relay UE, and the remote UE information includes a Uu interface identifier and/or a PC5 interface identifier of the remote UE.