Compressed System Information Blocks for Link Budget Limited UEs
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Solution Overview
Problem
User equipment (UEs) with limited link budgets struggle to reliably decode system information messages broadcast by wireless base stations, particularly due to large transport block sizes and high coding rates, which hinder cell selection and communication initiation.
Innovation Solution
Base stations broadcast both compressed and non-compressed system information blocks, with the compressed blocks encoded at a lower coding rate and smaller transport block size, specifically designed for UEs with limited link budgets, allowing them to determine access parameters and initiate communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If system information blocks are broadcast with typical coding rates and transport block sizes, then the information can be transmitted efficiently for most UEs, but UEs with limited link budgets cannot reliably decode the messages
Solution Approach 1:
The patent segments system information transmission into two distinct formats: compressed SIBs for link budget limited UEs and non-compressed SIBs for other UEs. This segmentation allows each group to receive information optimized for their specific capabilities, resolving the contradiction between efficient transmission and reliable decoding for constrained devices.
Solution Approach 2:
The patent applies local quality by providing different quality levels of system information to different UE groups. Link budget limited UEs receive compressed SIBs with lower coding rates and smaller transport block sizes optimized for their constraints, while other UEs receive full-featured non-compressed SIBs, ensuring each receives appropriately tailored information.
2Loss of information
If multiple SIBs are bundled on a given SI window, then comprehensive system information is provided, but the transport block size becomes large and difficult to decode for link budget limited UEs
Solution Approach 1:
The patent extracts only the essential access parameters from the full system information and transmits them in compressed SIBs to link budget limited UEs. This extraction provides sufficient information for these UEs to access the network without requiring them to decode complete bundled SIBs, maintaining information adequacy while reducing decoding complexity.
Solution Approach 2:
The patent applies partial action by transmitting a subset of system information (compressed SIBs) that is sufficient for link budget limited UEs to access the network, rather than transmitting the complete system information bundle. This partial transmission reduces the transport block size to manageable levels for constrained devices.
Data Source
AI summary
Techniques are disclosed relating to broadcasting and receiving system information in a radio access network (RAN). In some embodiment, a base station is configured to broadcast different sets of first system information blocks (SIBs) for different classes of user equipment devices (e.g., traditional UEs and UEs having a limited link budget). Different classes of UEs may use the different sets of SIBs to initiate communications with the base station.