Wireless Device System Information Indexing for Handover
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Solution Overview
Problem
Current cellular communication systems face challenges in efficiently acquiring and transmitting minimum system information during handovers, leading to unnecessary information transmission and reduced handover performance, especially in New Radio (NR) systems where system information may be larger and valid for multiple cells.
Innovation Solution
A method where wireless devices inform serving nodes of stored system information configurations, allowing the nodes to determine and transmit only the necessary information during handovers, using value-tags to index valid system information configurations for multiple cells or areas, thereby reducing unnecessary data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device transmits all stored system information configurations to the serving node during handover, then the target node can determine the necessary information, but this leads to unnecessary information transmission and increased data exchange volume
Solution Approach 1:
The patent extracts only the necessary system information from the complete stored configurations by using value-tag indices. Instead of transmitting all system information blocks, the wireless device transmits only the indices (value-tags) that identify the specific configurations needed for handover, significantly reducing the information volume while ensuring the target node receives exactly what is needed.
Solution Approach 2:
The patent uses value-tags as simplified copies or references to the actual system information configurations. Rather than transmitting the full system information data, the system transmits compact index values that point to the stored configurations, enabling efficient information exchange without duplicating the complete data sets.
2Ease of operation
If the system transmits complete system information during handover, then the target cell can be accessed, but this reduces handover performance and system capacity due to increased data exchange
Solution Approach 1:
The patent extracts only the essential system information needed for target cell access from the complete configuration sets. By transmitting only the value-tag indices that identify the necessary configurations, the system enables target cell access while minimizing the data exchange overhead that would otherwise degrade handover performance.
Solution Approach 2:
The patent changes the parameter representation from full system information blocks to compact value-tag indices. This parameter transformation reduces the data size from potentially large system information structures to small integer indices, improving handover performance by reducing transmission time and processing overhead while maintaining the ability to access the target cell.
3Adaptability or versatility
If the wireless device stores system information for multiple cells, then it can perform handover to multiple target cells, but this increases the amount of stored information and memory requirements
Solution Approach 1:
The patent uses value-tags as compact references that allow the wireless device to store and manage system information for multiple cells efficiently. Instead of duplicating full system information for each cell, the device stores concise index values that point to the actual configurations, enabling multi-cell handover capability while minimizing memory requirements through this referencing approach.
Solution Approach 2:
The value-tag system provides a universal indexing mechanism that can reference system information configurations across multiple cells. A single value-tag structure can identify configurations for different cells, making the storage system versatile and adaptable to handover operations to any target cell without requiring separate storage structures for each cell.
Data Source
AI summary
A method of operating a wireless device includes transmitting, to a serving node, an indication of system information configurations stored by the wireless device, the indication including a plurality of indices each corresponding to a respective system information configuration stored by the wireless device. The wireless device receives a handover command instructing the wireless device to access a target cell, wherein the handover command indicates a selected one of the plurality of indices corresponding to the target cell, and accesses the target cell using a system information configuration corresponding to the selected one of the plurality of indices.