RRC Connection Establishment via Relay Terminal Sidelink
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Solution Overview
Problem
Current relay technologies do not specify how to establish an RRC connection between a remote device and a base station, lacking clear guidelines for the transmission of RRC messages in relay systems.
Innovation Solution
A method is provided to generate and send RRC messages through a wireless communications interface, using indications and data packets to facilitate RRC connections between remote devices and base stations, involving logical channels, protocol layers, and sidelink control information to ensure flexible and effective message transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If relay technology is used to enable remote device communication with base station, then communication coverage is extended, but RRC connection establishment is undefined
Solution Approach 1:
The relay device acts as an intermediary between the remote device and base station. The remote device sends RRC messages to the relay device via PC5 interface, and the relay device forwards these messages to the base station via Uu interface, enabling RRC connection establishment without direct communication between remote device and base station
Solution Approach 2:
The RRC message transmission process is segmented into two distinct parts: (1) transmission from remote device to relay device over PC5 interface, and (2) transmission from relay device to base station over Uu interface. This segmentation allows each interface to be optimized independently for its specific communication requirements
2Reliability
If multiple transmission paths are used for RRC messages, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The relay device performs multiple functions: it acts as a remote device when communicating with the base station (receiving and forwarding RRC messages), and simultaneously acts as a base station when communicating with other remote devices. This multi-functionality enables flexible RRC message routing through multiple paths without requiring separate dedicated relay devices for each function
Solution Approach 2:
The system dynamically selects transmission paths based on current network conditions and device roles. Remote devices can dynamically switch between direct Uu interface connection and indirect PC5+Uu interface connection through relay devices, optimizing transmission reliability adaptively
Data Source
AI summary
An RRC connection method, including generating, by a first terminal, a first RRC message, and sending, by the first terminal, a first indication and first data to a second terminal through a first path, where the first path is a wireless communications interface between the first terminal and the second terminal, the first data includes the first RRC message, and the first indication is used to indicate the second terminal to send the first RRC message to a radio access network device.