SIB Delivery Across Bandwidth Parts to Prevent Cell Reselection
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Solution Overview
Problem
Terminal devices in RRC connected state cannot receive system information blocks (SIBs) on active bandwidth parts, leading to reduced communication reliability as they mistakenly consider the cell barred and perform unnecessary cell reselection.
Innovation Solution
Network devices send system information blocks to terminal devices through dedicated signaling on a second bandwidth part when a preset condition is met, ensuring periodic updates without configuring broadcast resources on that part, thereby maintaining valid SIBs in the terminal device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal device works on an active bandwidth part without configured system information block transmission, then resource allocation is optimized and energy consumption is reduced, but the terminal device cannot receive system information blocks and communication reliability deteriorates
Solution Approach 1:
The network device proactively sends system information blocks to the terminal device before the terminal device needs to receive them on the active bandwidth part. This preliminary action ensures that the terminal device has valid system information stored, avoiding communication failures while allowing the active bandwidth part to be optimized for data transmission without system information broadcast configuration.
2Reliability
If the network device configures system information block transmission on the active bandwidth part, then the terminal device can receive system information blocks, but resource allocation efficiency decreases and device complexity increases
Solution Approach 1:
The patent separates the functions of system information block transmission and active data transmission by using different bandwidth parts. The initial bandwidth part is configured for system information block broadcast, while the active bandwidth part is optimized for data transmission. This segmentation allows each bandwidth part to be independently optimized without compromising the other function.
3Quantity of substance
If the terminal device stores system information blocks with valid duration, then memory usage is optimized, but the terminal device cannot update system information when the active bandwidth part does not carry broadcasts
Solution Approach 1:
The terminal device monitors the validity duration of stored system information blocks and sends feedback to the network device when the duration is approaching expiration. The network device uses this feedback to determine when to send updated system information blocks, ensuring that the terminal device maintains valid system information without continuously storing outdated data.
Data Source
AI summary
System information block transmission methods and communication apparatus are provided to resolve a problem that a terminal device cannot receive, on an active bandwidth part, a system information block broadcast by a network device. A network device sends a system information block to a terminal device through a first bandwidth part. When determining that a first moment satisfies a preset condition, the network device sends the system information block to the terminal device through a second bandwidth part, where the system information block is included in first dedicated signaling, and configuration information for sending the system information block by the network device is not configured on the second bandwidth part.