Partial System Information Block Updates in Wireless Terminals
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Solution Overview
Problem
In wireless telecommunications systems, particularly in LTE-based networks, there is a challenge in efficiently transmitting and receiving System Information Blocks (SIBs) to and from terminal devices, especially for reduced capability devices and those in vehicle-based systems, due to the large size of SIBs and the transient nature of cell connections.
Innovation Solution
The solution involves a base station controller that transmits a reference to previously stored system information or partial system information blocks to terminal devices, allowing them to reuse existing data and only update specific portions, thereby reducing the need for full retransmission of large SIBs and improving data handling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If full System Information Blocks (SIBs) are transmitted to terminal devices, then complete system information is provided, but data transfer size and transmission time increase significantly
Solution Approach 1:
The patent segments the System Information Block into multiple parts: a first part containing common information applicable to multiple base stations, and a second part containing base station-specific difference information. This segmentation allows terminal devices to receive only the necessary difference information rather than complete SIBs from every base station, reducing data transfer size while maintaining information completeness.
Solution Approach 2:
The patent implements preliminary action by having terminal devices store the first part of the SIB (common information) in advance. When moving to a new base station, the device already possesses the common information and only needs to acquire the smaller second part (difference information), thereby reducing the data transfer required during cell reselection.
2Adaptability or versatility
If terminal devices store complete system information for multiple base stations, then information availability is improved, but storage requirements and device complexity increase
Solution Approach 1:
The patent divides system information into two segments: common information (first part) and difference information (second part). Terminal devices store the common information portion and only maintain minimal difference information for current base stations, significantly reducing storage requirements while preserving adaptability to multiple base stations.
Solution Approach 2:
The common information part of the SIB is designed to be universal across multiple base stations within a network. Terminal devices store this universal information once and can apply it to multiple base stations, eliminating the need to store complete separate SIBs for each base station and reducing overall storage requirements.
3Reliability
If System Information Blocks are transmitted frequently to ensure updated information, then information freshness is improved, but transmission overhead and energy consumption increase
Solution Approach 1:
By segmenting SIB transmission into common information and difference information, the patent enables more frequent and efficient updates. Only the smaller difference information part needs to be transmitted frequently to reflect base station-specific changes, while the common information is updated less frequently, reducing overall transmission overhead and energy consumption while maintaining information freshness.
4Loss of information
If large SIBs are transmitted to reduced capability devices, then complete system information is provided, but the devices struggle to handle and process the data efficiently
Solution Approach 1:
The patent segments system information into a common part and a difference part, allowing reduced capability devices to receive and process only the smaller difference information specific to their current base station. This segmentation makes the data manageable for devices with limited processing capabilities while still providing complete and accurate system information.
Data Source
AI summary
A terminal device for use in a wireless telecommunications system comprises a transceiver to perform wireless communication with a base station and to obtain system information defining communication parameters from system information data received from that base station; system information storage; and a controller to detect whether the system information storage already holds at least some of the system information applicable to a newly communicating base station and to control the transceiver to obtain any portions of the system information not already held by the terminal device, in which: the system information comprises a plurality of system information blocks; and the controller is configured to detect parts of a system information block stored by the system information storage which are applicable to the newly communicating base station and to obtain other parts of that system information block as a partial system information block from the newly communicating base station.