Sidelink Relay System Information for Out-of-Coverage UEs
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Solution Overview
Problem
Future wireless communications networks face challenges in efficiently supporting a wide range of devices with different data traffic profiles, particularly in scenarios where remote UEs are out of coverage and need to acquire area-specific system information via relay UEs.
Innovation Solution
Implementing a method for remote UEs to request and receive area-specific system information through a sidelink interface with a relay UE, which can acquire and transmit this information from the network infrastructure or store it for later delivery, using RRC signaling and Xn interfaces to manage system information updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If user equipment continuously monitors downlink control information to detect network slicing support, then the ability to detect network slicing capability is improved, but the consumption of device resources and energy increases
Solution Approach 1:
The network side performs preliminary action by pre-configuring indication information that directly indicates whether the cell supports network slicing. This allows user equipment to obtain the capability information without continuous monitoring, reducing energy consumption while maintaining detection accuracy.
Solution Approach 2:
The patent introduces an intermediary indication information mechanism that conveys network slicing capability from the network side to user equipment. This intermediary carries the capability information efficiently, eliminating the need for continuous monitoring and reducing device resource consumption.
2Measurement precision
If user equipment monitors multiple search spaces for downlink control information, then the completeness of capability detection is improved, but the device complexity and processing load increase
Solution Approach 1:
The patent extracts the network slicing capability indication from the general downlink control information monitoring process. By separating this specific capability indication into a dedicated mechanism, the system achieves complete capability detection without requiring monitoring of multiple search spaces, thereby reducing processing load.
3Loss of information
If the network provides detailed capability information through multiple signaling messages, then the information completeness is improved, but the signaling overhead and transmission time increase
Solution Approach 1:
The patent merges the network slicing capability indication with existing system information blocks or dedicated signaling messages. By combining the capability information with already-necessary signaling, the system achieves complete information transmission without additional signaling overhead or transmission time.
Data Source
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AI summary
A communications device acting as a relay device receives a request for system information from another communications device via a sidelink interface between the communications device and the other communications device. The communications device acts as a relay device for the other communications device as a remote device, via which relay device the remote device can transmit data to or receive data from a radio network infrastructure equipment of a wireless communications network. The infrastructure equipment may be a first infrastructure equipment which forms a first cell of the wireless communications network via which the relay device can transmit the data to or receive the data from the wireless communications network. The request for the system information received from the remote device includes an indication of a cell of a radio network part of the wireless communications network for which the remote device is requesting the system information, which cell may be the first cell (same cell) or a second cell (different cell). The method includes identifying, from the indication of the cell for which the remote device is requesting the system information, whether a system information area of the cell for which the remote device is requesting the system information is the same as a system information area of the cell, via which the relay device can transmit the data to or receive the data for the remote device. The method includes determining whether to respond to the request for the system information based on whether the system information areas of the relay device and the remote device are the same or different. For example, the first cell and the second cell may form different parts of the radio network of the wireless communications network and therefore require different area specific system information or area specific system information blocks (SIBs).