RRC Reconfiguration for 5G Sidelink Relay Path Switch
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Solution Overview
Problem
In the context of 5G sidelink relay, ensuring that a target relay UE is in a connected mode during a direct-to-indirect path switch is challenging, particularly when the relay UE is in an RRC_idle or RRC_inactive mode, leading to potential service interruptions and difficulties in transmitting RRC reconfiguration messages.
Innovation Solution
The network device transmits a radio resource control reconfiguration message to the remote UE, including information on the target relay UE in RRC connected mode, ensuring the relay UE is in the RRC connected mode, thereby facilitating a smooth path switch with minimal service interruption and using existing direct-to-indirect path switch flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the relay UE is allowed to be in RRC_idle or RRC_inactive mode to save energy and reduce complexity, then energy consumption and device complexity are reduced, but service interruption occurs and RRC reconfiguration messages cannot be transmitted
Solution Approach 1:
The network device performs preliminary actions by selecting a target relay UE and preparing RRC reconfiguration messages before the actual path switch occurs. The network device maintains the target relay UE in RRC_connected mode in advance, ensuring it is ready to receive and process reconfiguration messages when the switch is needed, thus avoiding service interruption.
Solution Approach 2:
The network device acts as an intermediary that manages the RRC state of the relay UE. By controlling the relay UE to remain in RRC_connected mode through the network device's coordination, the system enables the relay UE to function as an effective intermediary for path switching while maintaining service continuity, resolving the conflict between energy saving and service reliability.
2Reliability
If the relay UE is kept in RRC_connected mode to ensure service continuity and enable message transmission, then service reliability is improved, but energy consumption increases
Solution Approach 1:
The network device applies local quality by selectively maintaining only the target relay UE in RRC_connected mode rather than all relay UEs. This localized approach ensures that the specific relay UE needed for path switching has the necessary connectivity and capability, while other relay UEs can remain in lower power states, thus balancing service reliability with energy consumption.
3Adaptability or versatility
If the network device selects a target relay UE from candidates to enable path switching, then path switch capability is improved, but the complexity of managing relay UE states increases
Solution Approach 1:
The network device performs preliminary selection of the target relay UE from candidate relay UEs before the path switch is executed. By identifying and preparing the target relay UE in advance, the network device simplifies the actual path switch operation, reducing the complexity of state management during the switching process while maintaining adaptability.
Data Source
AI summary
An apparatus for transceiving information, applicable to a second terminal equipment, includes: a receiver configured to: receive a radio resource control reconfiguration complete message form a first terminal equipment when the second terminal equipment is in a radio resource control idle mode or a radio resource control inactive mode, and cause the second terminal equipment to enter a radio resource control connected mode; and receive a radio resource control reconfiguration message from a network device; and processor circuitry configured to perform relay-related configuration of a PC5 interface and a Uu interface according to the radio resource control reconfiguration message.