System Information Segmentation for Wireless Handover Efficiency
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Solution Overview
Problem
In wireless communication systems, particularly in 5G small cells, user equipment (UE) currently has to acquire all system information when changing cells, leading to inefficient signaling and increased energy consumption, as it does not know which system information blocks (SIBs) have changed.
Innovation Solution
The proposed method organizes system information into common and cell-specific categories, allowing UE to skip acquiring common system information when moving between cells within the same cloud, using flags to indicate changes and optimizing system information acquisition by only updating cell-specific information during handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE acquires all system information when changing cells, then system information completeness is ensured, but signaling efficiency deteriorates and energy consumption increases
Solution Approach 1:
The patent segments system information into two distinct categories: common system information (applicable to multiple cells) and cell-specific system information (unique to each cell). This segmentation allows UE to selectively acquire only cell-specific information when changing cells, rather than acquiring all system information, thereby reducing energy consumption while maintaining completeness of necessary information.
Solution Approach 2:
The patent applies local quality by differentiating the acquisition strategy based on information type. Common system information is acquired once and reused across cells, while only cell-specific system information is acquired during cell changes. This localized approach optimizes energy usage by applying different acquisition behaviors to different information categories based on their scope and relevance.
2Reliability
If UE acquires all system information when changing cells, then information accuracy is maintained, but signaling overhead increases
Solution Approach 1:
By segmenting system information into common and cell-specific categories, the patent enables precise tracking of what information actually changes during cell transitions. Only cell-specific information is signaled and acquired during handovers, reducing signaling overhead while maintaining accuracy for the specific cell being accessed.
Solution Approach 2:
The patent extracts common system information from the cell change acquisition process entirely, allowing UE to retain this information across cell changes. Only the necessary cell-specific portion is extracted and acquired during each cell change, eliminating redundant signaling for common information while maintaining information accuracy.
3Reliability
If UE acquires all system information when changing cells, then system information up-to-date status is ensured, but access time increases
Solution Approach 1:
The patent segments the system information acquisition process into two phases: initial acquisition of common information (done once) and incremental acquisition of cell-specific information (done only when needed). This segmentation dramatically reduces access time during cell changes while ensuring information remains up-to-date for the current cell.
Solution Approach 2:
The patent performs preliminary acquisition of common system information during initial cell attachment or system information update events. This preliminary action ensures that when cell changes occur, UE already possesses valid common information and only needs to quickly acquire cell-specific information, thereby minimizing access time while maintaining up-to-date status.
Data Source
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AI summary
There is provided a method comprising, for a UE associated with a first base station in a first cell of a plurality of cells, receiving first system information and second system information, said first system information associated with the first cell, said second system information associated with the plurality of cells and, when the UE moves to a second cell of the plurality of cells, updating said first information and maintaining said second information.