Remote UE RRC Connection Management via Relay
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Solution Overview
Problem
Current wireless communication systems face challenges in establishing efficient and reliable UE-to-network relay communication, particularly in supporting 5G ProSe services, due to complexities in managing Radio Resource Control (RRC) connections and sidelink communications, which affect data throughput and service reliability.
Innovation Solution
The method involves a remote UE establishing a unicast link with a relay UE, creating and using a first RLC entity to set up an RRC connection with the network through the relay UE, selecting a suitable cell, releasing the first RLC entity, and transmitting a second RRC message directly to the network, allowing for dynamic RRC connection re-establishment and sidelink communication management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a remote UE establishes an RRC connection with the network via a relay UE using a first RLC entity, then the UE can communicate through the relay, but the device complexity and management overhead increase due to multiple RRC connections and RLC entities
Solution Approach 1:
The patent implements dynamic RRC connection re-establishment where the remote UE can switch between relay UE and direct network connection based on real-time conditions. The UE dynamically creates, uses, and releases RLC entities as needed, transitioning from static relay dependency to flexible dynamic connectivity management.
Solution Approach 2:
The patent segments the RRC connection establishment process into distinct phases: initial connection via relay UE with first RLC entity, cell selection, and optional direct connection with second RLC entity. This segmentation allows independent management of each connection path and enables selective release of resources.
2Reliability
If the remote UE maintains multiple RRC connections (via relay UE and direct), then communication reliability improves, but the time required for connection establishment and management increases
Solution Approach 1:
The patent performs preliminary cell selection before finalizing the RRC connection. The remote UE selects a suitable cell in advance and releases the first RLC entity before establishing the second RRC message transmission path. This preliminary action optimizes the connection establishment sequence and reduces overall time.
Solution Approach 2:
The patent maintains continuous communication by keeping both relay UE and direct network connection options available. The UE can seamlessly switch between these paths without full disconnection, ensuring continuous useful action while managing connection time through efficient resource release and re-establishment procedures.
Data Source
AI summary
A method and device are disclosed from the perspective of a remote User Equipment (UE). In one embodiment, the method includes the remote UE establishing a unicast link with a relay UE. The method further includes the remote UE establishing a Radio Resource Control (RRC) connection with a network via the relay UE, wherein a first Radio Link Control (RLC) entity is created and used for transmitting a first RRC message for request of establishing the RRC connection to the network via the relay UE. The method also includes the remote UE selecting a suitable cell. In addition, the method includes the remote UE releasing the first RLC entity in response to selection of the suitable cell. Furthermore, the method includes the remote UE transmitting a second RRC message to the network directly.