System Information Sidelink Relay to Reduce Remote UE Power
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Solution Overview
Problem
In UE-to-network relay scenarios, receiving system information by remote terminal devices results in high complexity and power consumption due to the need for maintaining cellular links.
Innovation Solution
The first terminal device receives system information from a second terminal device via a sidelink during its on duration, eliminating the need for a cellular link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the remote terminal device receives system information through a cellular link from the base station, then the system information can be obtained reliably, but the complexity and power consumption increase
Solution Approach 1:
The relay terminal device acts as an intermediary between the base station and the remote terminal device. The relay terminal receives system information from the base station via cellular link and forwards it to the remote terminal device via sidelink, thereby reducing the complexity and power consumption of the remote terminal device while maintaining reliable system information reception
2Reliability
If the remote terminal device receives system information through a cellular link from the base station, then the system information can be obtained reliably, but the power consumption increases
Solution Approach 1:
The relay terminal device serves as a mediator that receives system information from the base station through cellular link and transmits it to the remote terminal device through sidelink. This approach allows the remote terminal device to obtain system information reliably while significantly reducing its power consumption by avoiding direct cellular link maintenance
3Loss of information
If the remote terminal device maintains a cellular link to receive system information, then the system information can be received, but the resource usage increases
Solution Approach 1:
The system segments the communication path into two parts: cellular link between base station and relay terminal, and sidelink between relay terminal and remote terminal. This segmentation allows system information to be delivered reliably to the remote terminal while reducing cellular link resource usage by utilizing the sidelink for the final transmission
Data Source
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AI summary
A system information transmission method and apparatus are disclosed. When cell system information changes, a first terminal device receives, during on duration of the first terminal device, system information sent by a second terminal device, so that the first terminal device can receive the system information through a sidelink between the first terminal device and the second terminal device without a need to maintain a cellular link, thereby reducing complexity and power consumption of system information transmission. Alternatively, when cell system information changes and a first terminal device has only one receive radio frequency chain, the first terminal device obtains system information within a gap period of communication between the second terminal device and the first terminal device through a link between the first terminal device and a network device, so that the first terminal device maintains a cellular link only within the gap period, thereby reducing complexity and power consumption of system information transmission to some extent.