PC5-RRC Relay Activation in Multi-Path Communication
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Solution Overview
Problem
In multi-path communication scenarios, relay terminal equipment in RRC idle or RRC inactive state cannot efficiently transition to an RRC connected state, hindering effective relay services.
Innovation Solution
A multi-path communication apparatus and method that includes receiving and processing indication information to trigger or cancel PC5-RRC messages, enabling relay terminal equipment to enter an RRC connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If relay terminal equipment remains in RRC idle or RRC inactive state to save resources, then energy consumption is reduced, but the ability to provide relay services is lost
Solution Approach 1:
The network device triggers the relay terminal equipment to transition to RRC connected state in advance before actually needing relay services. This preliminary action ensures the relay terminal is ready when needed while allowing it to remain in energy-saving states most of the time, resolving the contradiction between energy saving and service readiness.
Solution Approach 2:
The system uses indication information from the network device to control the relay terminal's state transitions. The relay terminal monitors this feedback and adjusts its RRC state accordingly, enabling dynamic balancing between energy consumption and relay service capability based on actual network needs.
2Reliability
If relay terminal equipment transitions to RRC connected state to provide relay services, then relay service capability is restored, but signaling overhead increases
Solution Approach 1:
The patent extracts the essential control function from the full RRC connection establishment procedure. Instead of requiring complete state transition signaling, the system uses a simplified trigger mechanism where the network device sends indication information to activate the relay terminal's RRC connected state, reducing signaling overhead while maintaining service capability.
Solution Approach 2:
The indication information mechanism serves multiple functions: it triggers state transitions, controls relay service activation, and manages signaling efficiency. This multi-functional approach reduces the need for separate dedicated signaling messages, thereby reducing overall signaling overhead while maintaining relay service capability.
3Reliability
If PC5-RRC message is triggered to bring relay terminal into RRC connected state, then relay service is enabled, but unnecessary signaling occurs when not needed
Solution Approach 1:
The network device performs preliminary assessment and triggers the relay terminal's RRC connected state transition only when actually needed for relay services. This prevents unnecessary state changes and associated signaling when relay services are not required, eliminating wasteful energy consumption while ensuring reliable service activation when needed.
Solution Approach 2:
The system uses indication information as feedback to control PC5-RRC message triggering. The relay terminal only sends these messages when the network device's indication information confirms relay services are needed, preventing unnecessary signaling and energy waste while ensuring reliable service activation when required.
Data Source
AI summary
A multi-path communication apparatus, configured in a remote terminal equipment, includes: a receiver configured to receive first indication information transmitted by a relay terminal equipment and second indication information transmitted by a network device; and processor circuitry configured to transmit a first PC5-RRC (radio resource control) message to the relay terminal equipment according to the second indication information, the first PC5-RRC message being used to bring the relay terminal equipment into a radio resource control connected state.