SIB Delivery on Active Bandwidth Parts via Dedicated Signaling
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Solution Overview
Problem
Terminal devices in RRC connected state cannot receive system information blocks (SIBs) broadcast on active bandwidth parts, leading to reduced communication reliability and potential cell reselection errors.
Innovation Solution
Network devices send system information blocks to terminal devices using dedicated signaling before the stored information expires, ensuring periodic updates without relying on broadcast reception on the active bandwidth part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices in RRC connected state rely on broadcast reception on active bandwidth part to obtain system information blocks, then the terminal device can obtain system information in connected state, but the terminal device cannot receive system information blocks broadcast on active bandwidth part leading to reduced communication reliability
Solution Approach 1:
The patent introduces dedicated signaling as an intermediary mechanism to transfer system information blocks from the network device to the terminal device. This dedicated signaling acts as a mediator that bridges the gap when broadcast reception on active bandwidth part fails, ensuring the terminal device can still obtain necessary system information without relying solely on broadcast mechanisms.
Solution Approach 2:
The network device proactively sends system information blocks to the terminal device before the terminal device encounters information expiration or loss. By performing preliminary updates of system information through dedicated signaling, the patent prevents the terminal device from entering a state where it cannot obtain valid system information, thereby maintaining communication reliability.
2Reliability
If the network device continuously broadcasts system information blocks on all bandwidth parts, then the terminal device can always receive system information, but the network device broadcast consumption increases and resource allocation becomes less flexible
Solution Approach 1:
The patent extracts the system information block transmission from the universal broadcast mechanism and implements it through targeted dedicated signaling. Instead of continuously broadcasting system information blocks on all bandwidth parts, the network device selectively sends system information blocks only to specific terminal devices that need them, thereby reducing overall broadcast consumption while maintaining system information availability.
Solution Approach 2:
The patent implements dynamic system information transmission where the network device adjusts the transmission method based on terminal device state and information requirements. The system transitions from static continuous broadcasting to dynamic on-demand dedicated signaling, allowing the network device to optimize broadcast consumption by sending system information blocks only when necessary and only to terminals that require them.
Data Source
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AI summary
A system information block transmission method and a 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. In this application, a network device sends a system information block to a terminal device through a first bandwidth part. When determining that a first moment satisfying a preset condition is reached, the network device sends the system information block to the terminal device at the first moment 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.