Relay UE System Information Update for Remote Device Energy Savings
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Solution Overview
Problem
In wireless communication systems, remote user equipment (UE) faces inefficiencies in receiving and updating system information, particularly due to the burden of reading system information directly from cells, which leads to high battery consumption and increased energy usage, especially in poor channel conditions where multiple attempts are needed for successful decoding.
Innovation Solution
A method where the remote UE requests and receives broadcast information from a relay UE or the network, using a request message with indicators for updating specific information blocks, and timing information is provided to ensure efficient updating of system information, reducing the need for repeated attempts and conserving energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If remote UE reads system information directly from cells, then system information can be obtained, but battery consumption increases and energy efficiency deteriorates
Solution Approach 1:
The patent introduces a relay UE as an intermediary between the remote UE and the cell. The relay UE receives system information directly from the cell and forwards it to the remote UE, eliminating the need for the remote UE to directly read system information from the cell. This mediator approach allows the remote UE to obtain system information without expending energy on direct reading operations, thus resolving the contradiction between information acquisition and energy consumption.
2Reliability
If remote UE attempts to decode system information multiple times in poor channel conditions, then system information can be obtained, but energy usage increases
Solution Approach 1:
The relay UE performs the system information reading and decoding operation in advance before the remote UE needs it. The relay UE, being in better channel conditions, can successfully decode the system information in a single attempt. This preliminary action by the relay UE eliminates the need for the remote UE to perform multiple decoding attempts, thereby ensuring reliability while minimizing energy loss.
3Loss of information
If remote UE requests updated broadcast information, then information currency is improved, but communication overhead increases
Solution Approach 1:
The patent implements a feedback mechanism where the remote UE monitors for updates to system information and sends a request message to the relay UE only when updates are detected. The relay UE, in turn, requests updated broadcast information from the network only when necessary. This feedback-based approach ensures that information remains current while minimizing unnecessary communication overhead by triggering data retrieval only when updates are actually present.
Data Source
AI summary
A method for receiving broadcast information by a user equipment (UE) connected with a network via a relay UE in a wireless communication system is disclosed. The method includes steps of determining whether the broadcast information stored in the UE is updated or not; transmitting a request message for updating the broadcast information to the relay UE, when the broadcast information stored in the UE is not updated; and receiving the requested broadcast in¬formation from the relay UE or the network.