UE Relay Paging via RRC State Signaling to Cut Monitoring Power
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Solution Overview
Problem
The power consumption at both gNB and UE sides is high due to the need for relay UEs to monitor multiple paging occasions in Layer 2 UE-to-network relay scenarios, especially when remote UEs are in RRC_CONNECTED state and not required to monitor paging messages for downlink data traffic.
Innovation Solution
A method where a remote UE transmits information to a core network node indicating that its linked relay UE is in an RRC_CONNECTED state, allowing the core network node to include this information in a paging message, enabling the network device to page the remote UE directly through dedicated RRC signaling, thereby reducing the need for the relay UE to monitor paging occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay UE monitors multiple paging occasions to page remote UE, then paging coverage is improved, but power consumption increases
Solution Approach 1:
The patent extracts the paging monitoring function from the relay UE by enabling the network device to directly page the remote UE through dedicated RRC signaling. The relay UE no longer needs to monitor multiple paging occasions, as the network device handles paging directly based on information provided by the remote UE about its linked relay UE's RRC state.
Solution Approach 2:
The patent introduces information about the linked relay UE's RRC state as an intermediary element. The remote UE provides this information to the network device, which then uses it to determine whether to page the remote UE directly or through the relay UE, eliminating the need for relay UE to monitor paging occasions.
2Reliability
If relay UE monitors multiple paging occasions, then paging reliability is improved, but resource utilization deteriorates
Solution Approach 1:
The patent extracts the paging monitoring function from the relay UE by enabling the network device to directly page the remote UE through dedicated RRC signaling. The relay UE no longer needs to monitor multiple paging occasions, as the network device handles paging directly based on information provided by the remote UE about its linked relay UE's RRC state.
Solution Approach 2:
The network device serves itself by making paging decisions based on information from the remote UE about the relay UE's state. This self-service mechanism eliminates the need for relay UE to actively monitor paging occasions, improving resource utilization while maintaining paging reliability.
3Reliability
If remote UE is in RRC_CONNECTED state, then connection availability is improved, but paging overhead increases
Solution Approach 1:
The patent applies preliminary action by having the remote UE proactively provide information about its linked relay UE's RRC state to the network device before paging is needed. This allows the network device to make informed paging decisions without requiring additional paging overhead when the remote UE is in RRC_CONNECTED state.
Solution Approach 2:
The patent changes the parameter of paging behavior based on the remote UE's RRC state. When the remote UE is in RRC_CONNECTED state, the network device uses the provided relay UE state information to determine appropriate paging actions, reducing unnecessary paging overhead while maintaining connection availability.
Data Source
AI summary
The present disclosure provides a method in a first terminal device. The method includes: transmitting, to a core network node, first information indicating that a second terminal device, serving as a relay between the first terminal device and a network device, is in a Radio Resource Control, RRC, Connected, RRC_CONNECTED, state.