Relay UE RRC Connection Handling for Remote UEs
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a challenge in handling RRC connection request messages by a Relay UE, especially when it is in an RRC idle state, as existing methods require a connection between the Relay UE and the core network for RRC connection establishment, which is inefficient in terms of message exchanges and power consumption.
Innovation Solution
The proposed solution involves the Relay UE handling RRC connection request messages by informing its NAS layer and triggering NAS message transmission, with two models for the AS layer's handling of received RRC connection requests and three models for NAS layer triggering, optimizing message exchanges and power usage by reducing the number of messages and maintaining RRC connection without establishing a connection with the core network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Relay UE establishes a connection with the core network for RRC connection establishment, then the RRC connection can be established reliably, but the message exchanges increase and power consumption increases
Solution Approach 1:
The patent extracts the core function of RRC connection establishment from the traditional core network dependency. The Relay UE handles RRC connection requests from Remote UEs locally without requiring core network involvement, separating the RRC connection management function from the core network connection requirement. This allows the Relay UE to maintain RRC connections for multiple Remote UEs independently, reducing signaling overhead and power consumption while maintaining connection reliability.
2Device complexity
If the Relay UE handles RRC connection requests through traditional methods, then connection management is simplified, but the number of message exchanges increases
Solution Approach 1:
The patent implements preliminary action by having the Relay UE pre-establish and maintain RRC connection state readiness before actual Remote UE connections are needed. The Relay UE proactively manages its RRC connection state and prepares to handle connection requests, eliminating the need for repeated connection establishment signaling. This preliminary preparation reduces the number of message exchanges required when Remote UEs need to connect, as the Relay UE is already in the appropriate state to accept and manage connections efficiently.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for handling of a RRC connection request message of a remote UE by a Relay UE in wireless communication system, the method comprising: receiving NAS information for establishing RRC connection of the remote UE from a remote UE which is configured to connect to the relay UE via sidelink in state that both of the remote UE and the relay UE are in RRC idle states, transmitting a RRC connection request message with an identity of the remote UE to an eNB, when a NAS layer of the relay UE triggers only service request for the remote UE; transmitting a RRC connection setup message for the remote UE to the remote UE; and transmitting a RRC connection setup complete message with the received NAS information of the remoter UE to the eNB.