Remote UE Sidelink Relay for Power Saving and Continuity
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Solution Overview
Problem
In sidelink communication scenarios, remote UEs face challenges in maintaining continuous data transmission without increasing power consumption and avoiding interruptions, especially when air-interface issues occur, as they need to communicate with relay UEs without direct base station connectivity.
Innovation Solution
The remote UE reports its support for sidelink and non-3GPP communication to the base station, which configures or selects a communication link for the UE to use, allowing the UE to switch between sidelink, non-3GPP links, and air-interface links based on channel quality and availability, ensuring power efficiency and continuous data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If remote UE uses traditional air-interface communication with base station, then data transmission can be established, but power consumption increases and transmission interruptions occur when air-interface issues arise
Solution Approach 1:
The patent introduces relay UE as an intermediary node between remote UE and base station. Relay UE establishes sidelink communication with remote UE and forwards data to base station, enabling remote UE to communicate without direct air-interface connection, thus reducing power consumption and avoiding interruptions from air-interface issues
Solution Approach 2:
The communication path is segmented into multiple segments: remote UE to relay UE (sidelink), and relay UE to base station (air-interface). This segmentation allows the system to use more reliable sidelink for remote UE communication while reserving air-interface for relay UE's backhaul communication, improving overall reliability and power efficiency
2Reliability
If remote UE establishes direct communication link with base station, then data transmission can be maintained, but transmission interruptions occur when air-interface quality deteriorates
Solution Approach 1:
Relay UE serves as a mediator that establishes sidelink communication with remote UE, isolating remote UE from direct air-interface dependency. The relay UE handles all air-interface communications with base station, protecting remote UE from air-interface quality deterioration and preventing transmission interruptions
Solution Approach 2:
The communication system is segmented into sidelink segment (remote UE to relay UE) and air-interface segment (relay UE to base station). This segmentation isolates remote UE from air-interface issues, as sidelink communication provides an alternative path that is not affected by air-interface quality
3Use of energy by moving object
If remote UE uses sidelink communication with relay UE, then power consumption is reduced, but communication link establishment complexity increases
Solution Approach 1:
The base station performs preliminary actions by pre-configuring relay UEs with communication parameters and resources before actual data transmission. This includes pre-establishing relay UE's connection to base station and preparing sidelink resources, so that when remote UE needs to communicate, the link establishment process is simplified and faster
Solution Approach 2:
The system implements feedback mechanisms where relay UE reports its status and available resources to base station, and base station provides feedback on allocated resources to relay UE and remote UE. This feedback loop simplifies the complexity by providing clear guidance on communication parameters and reducing establishment time
Data Source
AI summary
An information transmission apparatus and method and a communication system. The information transmission method includes: reporting information including an ID of a relay UE by a remote UE to a base station, the information further indicating that the remote UE supports sidelink communication and/or non-3GPP communication with the relay UE; and performing communication based on a communication link configured by the base station or a communication link selected by the remote UE. Hence, not only the UE may be made power-saving, but also continuity of data transmission may be kept.