UE System Information Acquisition for Enhanced Coverage
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Solution Overview
Problem
In LTE-advanced wireless communication systems, user equipment (UE) experiences unnecessary power consumption due to continuous acquisition of new System Information Blocks (SIBs) for enhanced coverage and incorrect cell barring when SIB1 and SIB2 are not received.
Innovation Solution
A communication device that receives a Master Information Block (MIB) indicating supported enhanced coverage, verifies the validity of stored SIBs, and only acquires SIBs for enhanced coverage when necessary, avoiding unnecessary power consumption and incorrect cell barring by accessing the cell based on received SIBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously acquires new SIBs for enhanced coverage, then the UE can access cells with enhanced coverage support, but the UE experiences unnecessary power consumption
Solution Approach 1:
The UE performs preliminary verification by checking the value tag in SIB1 against the stored SIB2 before attempting to acquire enhanced coverage SIBs. This preliminary action prevents unnecessary acquisition operations and reduces power consumption while ensuring reliable cell access when changes are detected.
Solution Approach 2:
The system uses value tags as feedback mechanisms to inform the UE whether system information has changed. The UE monitors these tags and only acquires enhanced coverage SIBs when the tag indicates a change, creating a feedback-driven acquisition strategy that balances reliability with energy efficiency.
2Loss of information
If the UE acquires SIB1 and SIB2 upon receiving a paging message indicating system information change, then the UE can verify system information updates, but the UE causes unnecessary power consumption since SIB1 and SIB2 cannot be used for enhanced coverage
Solution Approach 1:
The invention extracts and verifies only the essential SIB1 value tag information needed to determine system information changes, rather than acquiring the complete SIB1 and SIB2 messages. This selective extraction approach maintains information verification capability while eliminating unnecessary power consumption from acquiring non-essential system information blocks.
3Ease of operation
If the UE considers a cell as barred when SIB1 or SIB2 is not received, then the UE follows the prior art protocol, but the UE incorrectly bars cells that support enhanced coverage access
Solution Approach 1:
The invention applies different evaluation criteria for different cell types. For cells supporting enhanced coverage (indicated by specific MIB parameters), the UE evaluates bar status based on enhanced coverage SIB reception rather than traditional SIB1/SIB2 reception. This localized quality adjustment ensures correct cell barring determination for enhanced coverage cells while maintaining protocol compliance.
Data Source
AI summary
A communication device comprises a storage unit for storing instructions and a processing means coupled to the storage unit. The processing means is configured to execute the instructions stored in the storage unit. The instructions comprise receiving a master information block (MIB) indicating that an access for enhanced coverage is supported from a cell; and starting acquiring at least one system information block (SIB) for enhanced coverage.