Sidelink Relay SIB Forwarding for Targeted System Information Updates
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently delivering system information updates to remote UEs, particularly those in RRC_IDLE or RRC_INACTIVE states, or out-of-coverage, through sidelink relay operations.
Innovation Solution
A relay UE maintains a list of interested system information block (SIB) types for remote UEs and forwards only the relevant updates via sidelink connections, using PC5 radio resource control messages, thereby avoiding unnecessary signaling over access links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the relay UE forwards all updated SIBs to remote UEs, then the remote UEs receive complete system information, but the signaling overhead increases and efficiency decreases
Solution Approach 1:
The relay UE extracts and forwards only the specific SIB types that remote UEs are interested in, rather than forwarding all updated SIBs. This is achieved by maintaining a list of interested SIB types for each remote UE and selectively forwarding only those SIBs that match the interested types, thereby reducing signaling overhead while delivering complete relevant information.
Solution Approach 2:
The relay UE applies different forwarding behavior to different remote UEs based on their individual interests. By maintaining separate lists of interested SIB types for each remote UE and customizing the forwarding content accordingly, the system achieves local optimization where each remote UE receives exactly the information it needs without unnecessary overhead.
2Productivity
If the relay UE maintains detailed lists of interested SIB types for multiple remote UEs, then the information delivery becomes more efficient and targeted, but the device complexity increases
Solution Approach 1:
The relay UE uses a universal data structure (list of interested SIB types) that can serve multiple remote UEs with different information needs. This list structure is maintained within the remote UE context and can be efficiently updated and queried, allowing the same mechanism to handle diverse information delivery requirements without requiring separate complex processing for each remote UE.
3Adaptability or versatility
If the relay UE acquires all updated SIBs from the network, then it can forward any requested SIB to remote UEs, but the acquisition overhead and energy consumption increase
Solution Approach 1:
The relay UE extracts only the specific SIB types that are actually needed by remote UEs (as indicated in the interested SIB types list) rather than acquiring all updated SIBs from the network. This selective acquisition approach maintains the ability to forward requested SIBs while significantly reducing the acquisition overhead and energy consumption by focusing only on relevant information.
Data Source
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Figure 3B~4
AI summary
Apparatus and methods are provided for system information delivery through a sidelink relay in a wireless network. In one novel aspect, the relay UE obtains and maintains a list of interested system information block, SIB, types of the remote UE, acquires the updated SI/SIBs, and forwards the updated SIBs that the remote UE is interested in. In one embodiment, the UE establishes a sidelink connection with a remote UE (601), obtains a list of interested SIB types of the remote UE (602), receives a short message from the wireless network (603), acquires updated SIBs (604), and forwards one or more selected SIBs based on the list of interested SIB types to the remote UE (605). In another embodiment, the relay UE stores/maintains the list of interested SIB types of the remote UE within a remote UE context of the remote UE during the lifetime of the remote UE.