Remote UE Mode and SRB Handling for Selective RRC Re-establishment
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Solution Overview
Problem
In wireless communication systems, remote UE in multi-path mode unnecessarily initiates RRC connection re-establishment upon receiving a notification from a relay UE, leading to ineffective procedures.
Innovation Solution
The remote UE determines its operating mode (single-path or multi-path) and the type of SRB (direct, indirect, or split) to selectively initiate RRC connection re-establishment or path failure reporting based on notification messages from the relay UE, which are categorized by specific trigger conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the remote UE always initiates RRC connection re-establishment upon receiving notification from relay UE, then the connection reliability is improved, but unnecessary re-establishment procedures occur in multi-path mode reducing system efficiency
Solution Approach 1:
The patent applies dynamics by making the RRC connection re-establishment behavior adaptive rather than static. The remote UE dynamically adjusts its response based on the detected operating mode (single-path or multi-path). In single-path mode, re-establishment is always initiated upon notification, while in multi-path mode, re-establishment is conditionally initiated only when the SRB type requires it. This dynamic adaptation resolves the contradiction by optimizing behavior for each specific operational context.
Solution Approach 2:
The patent changes the parameter of re-establishment initiation from a fixed binary decision to a conditional decision based on detected mode parameters. The remote UE detects whether it is in single-path or multi-path mode, and further detects the SRB type (direct, indirect, or split) in multi-path mode. These parameter changes enable differentiated behavior: in single-path mode re-establishment is always initiated, while in multi-path mode it depends on whether the SRB is indirect or split, thereby avoiding unnecessary re-establishment while maintaining reliability when needed.
2Productivity
If the remote UE detects operating mode and SRB type to selectively initiate re-establishment, then unnecessary procedures are avoided improving efficiency, but the complexity of the UE increases
Solution Approach 1:
The patent applies self-service by enabling the remote UE to autonomously detect its own operating mode and SRB type without requiring additional network assistance or complex external coordination. The UE independently determines whether it is in single-path or multi-path mode and identifies its SRB type (direct, indirect, or split) based on existing configuration information. This self-service capability reduces the need for additional network control signaling and simplifies the overall system architecture while maintaining high efficiency.
3Reliability
If the remote UE initiates RRC connection re-establishment in multi-path mode, then connection reliability is maintained, but unnecessary re-establishment occurs causing time loss
Solution Approach 1:
The patent changes the parameter of re-establishment initiation from unconditional to conditional based on SRB type detection. In multi-path mode, the remote UE specifically checks whether the SRB is an indirect bearer or split SRB before initiating re-establishment. This parameter-based conditional initiation ensures that re-establishment occurs only when the indirect path is affected, avoiding unnecessary time loss while maintaining connection reliability for affected bearers.
Solution Approach 2:
The patent applies partial action by selectively initiating re-establishment only for the necessary SRBs rather than all SRBs. In multi-path mode, when the notification indicates relay UE handover, the UE initiates re-establishment only for indirect bearers and split SRBs that are affected, while leaving direct bearers unchanged. This partial action approach minimizes time loss by avoiding redundant re-establishment procedures for unaffected connections while still maintaining reliability for affected ones.
Data Source
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AI summary
The present application provides a method performed by user equipment, and user equipment. The method is performed during communication performed between the UE and a base station via a single path or multiple paths, and includes the following steps: receiving, by a remote UE, a notification message from a relay UE, wherein the message includes a first information element representing an indication type, and the value of the first information element is set by the relay UE; and upon receiving the notification message, determining, by the remote UE in an RRC connected state, whether the remote UE is operating in a single-path mode or a multi-path mode; if the remote UE is operating in the single-path mode, initiating, by the remote UE, an RRC connection re-establishment procedure, and if the remote UE is operating in the multi-path mode, further determining, by the remote UE, whether an SRB is a direct bearer, an indirect bearer, or a split SRB.