U2N Relay RRC Reestablishment Control for Remote UE Connections
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Solution Overview
Problem
In sidelink communication scenarios, unnecessary connection reestablishment occurs when relay UEs encounter issues like radio link failure, handover, or cell reselection, leading to resource waste and inefficiency in U2N relay scenarios.
Innovation Solution
A method for controlling terminal connection in U2N relay scenarios, where a remote UE determines whether to initiate RRC reestablishment based on conditions such as multipath transmission configuration, path primary status, and failure recovery functions, to avoid unnecessary reestablishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the remote UE triggers reestablishment upon receiving notification messages from the relay UE, then connection reliability is improved, but unnecessary connection reestablishment occurs leading to resource waste
Solution Approach 1:
The patent introduces a new parameter (indication field) in the notification message that changes the behavior of the remote UE. When the indication field indicates that reestablishment is not needed, the remote UE suppresses the reestablishment procedure, thereby avoiding unnecessary resource consumption while maintaining connection reliability when actually needed.
Solution Approach 2:
The relay UE provides feedback information to the remote UE through the indication field in the notification message. This feedback mechanism allows the relay UE to inform the remote UE whether reestablishment should be triggered or suppressed, enabling the remote UE to make informed decisions about connection maintenance without wasteful reestablishment attempts.
2Reliability
If the remote UE maintains connection through both direct link and indirect link, then transmission rate and reliability are improved, but connection complexity increases
Solution Approach 1:
The patent implements dynamic connection management where the remote UE can flexibly switch between direct link only, indirect link only, or both links based on real-time conditions. The network device dynamically configures whether to use direct link, indirect link, or both, allowing the system to adapt to changing channel conditions without maintaining fixed complex multi-path connections.
3Stability of the object's composition
If the remote UE initiates RRC reestablishment upon receiving notification messages, then connection stability is improved, but connection interruptions increase
Solution Approach 1:
The patent applies preliminary anti-action by having the relay UE preemptively send an indication field in the notification message that prevents the remote UE from initiating reestablishment when it is not actually needed. This counteracts the natural tendency of the remote UE to trigger reestablishment upon receiving notifications, thereby preventing unnecessary connection interruptions before they occur.
Data Source
AI summary
A method for controlling terminal connection is applied to a user equipment (UE) to network (U2N) relay scenario and performed by a first terminal. The method includes: determining whether to initiate radio resource control (RRC) reestablishment according to a first condition, in response to the first terminal in a connected state receiving a first message sent by a second terminal; wherein the first terminal is a remote terminal in the U2N relay scenario, and the second terminal is a relay terminal in the U2N relay scenario.