Low-Complexity UE System Information Reception via Time Offset SIB Decoding
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Solution Overview
Problem
In wireless communication systems, particularly in coverage-enhanced areas, low-complexity user equipment (UE) such as machine-type communication (MTC) UEs face challenges in receiving system information due to difficulties in decoding master information blocks (MIB) and system information blocks (SIB), which affects their ability to access and maintain network connectivity.
Innovation Solution
A method is introduced where a newly defined SIB is decoded in a resource region spaced by a time offset from the received MIB, with the PDCCH for the SIB also being decoded in a resource region spaced by an offset from the MIB, allowing for successful reception of system information by low-complexity UEs. This method includes scheduling and decoding techniques that enable the UE to receive multiple SIBs using information obtained from decoding the PDCCH, which provides frequency and time region information for the SIBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-complexity UEs use conventional MIB and SIB decoding methods, then network coverage is limited, but decoding difficulty increases and connection reliability deteriorates
Solution Approach 1:
The system segments system information into multiple SIBs with different priority levels and coverage requirements. Low-complexity UEs can selectively decode only the necessary SIBs (e.g., SIB1 for basic access) without attempting to decode all system information, reducing decoding complexity while maintaining connection reliability in coverage-enhanced areas
Solution Approach 2:
The patent introduces dynamic scheduling of SIBs where the network can adaptively adjust SIB transmission parameters based on UE capability and coverage conditions. Low-complexity UEs receive simplified SIB configurations that dynamically reduce decoding requirements while ensuring reliable connection establishment
2Reliability
If system information is transmitted using conventional scheduling, then network resource efficiency is maintained, but coverage enhancement capability is insufficient
Solution Approach 1:
The system implements periodic repetition of SIB transmissions at configured intervals, allowing low-complexity UEs in coverage-enhanced areas to accumulate signal energy through multiple reception attempts. This periodic repetition extends coverage area while maintaining network resource efficiency through controlled transmission cycles
Solution Approach 2:
The patent applies parameter changes by adjusting SIB transmission power, repetition frequency, and resource allocation based on coverage requirements. Network can configure higher power and more frequent repetitions for areas requiring coverage enhancement, expanding service area without wasting resources in normal coverage zones
3Loss of information
If multiple SIBs are transmitted for low-complexity UEs, then system information completeness is improved, but network resource overhead increases
Solution Approach 1:
The patent creates universal SIB structures that can serve multiple UE types simultaneously. A single SIB configuration can provide essential information for both low-complexity UEs and conventional UEs, eliminating the need for separate complete SIB sets and reducing overall network resource consumption while maintaining information completeness
Data Source
AI summary
Provided are a method for receiving/decoding a system information block by a terminal and a device for supporting same. The terminal can receive one or more MIBs and receive/decode a first SIB on the basis of the received MIBs and a first time offset. The first SIB is an SIB which has been newly defined for a terminal having low complexity.