Terminal Bandwidth Fallback After Unsupported SIB1 Configuration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need to specify a frequency bandwidth for a terminal to communicate when it does not support the carrier bandwidth indicated by System Information Block 1 (SIB1) until an actually supported channel bandwidth is configured.
Innovation Solution
A terminal is equipped with a reception unit to receive system information and a control unit that sets a default channel bandwidth as a frequency bandwidth for communication, which is set after the reception unit receives the system information and before it receives configuration information of the supported channel bandwidth, in response to detecting that it does not support the channel bandwidth included in the received system information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal uses the carrier bandwidth indicated by SIB1 for communication, then the system can operate with a standardized bandwidth configuration, but the terminal cannot communicate properly if it does not support the indicated bandwidth
Solution Approach 1:
The terminal performs preliminary detection of whether it supports the carrier bandwidth indicated by SIB1 before attempting communication. If the terminal does not support the indicated bandwidth, it proactively determines and uses an alternative bandwidth (such as the maximum bandwidth it can support or a predefined default bandwidth) to ensure communication can proceed. This preliminary action prevents communication failure and ensures reliability for terminals with bandwidth limitations.
2Productivity
If the terminal immediately uses the bandwidth from SIB1 upon reception, then the communication setup is simple and fast, but there is no fallback mechanism if the terminal does not support that bandwidth
Solution Approach 1:
The terminal performs a preliminary compatibility check between its capabilities and the SIB1-indicated bandwidth before committing to communication. This preliminary action adds minimal overhead but ensures that the terminal only proceeds with communication using a bandwidth it actually supports, thereby maintaining both speed and reliability.
Solution Approach 2:
The terminal autonomously determines the appropriate bandwidth to use based on its own capability detection. If it does not support the SIB1-indicated bandwidth, it self-selects an alternative bandwidth without requiring complex negotiation or external assistance, thus maintaining communication setup speed while ensuring reliability through self-verification of compatibility.
3Reliability
If the system provides detailed bandwidth configuration information to ensure terminal compatibility, then communication reliability improves, but the system complexity and signaling overhead increase
Solution Approach 1:
Instead of the system providing detailed bandwidth configuration information and compatibility checks, the terminal performs self-detection of its bandwidth support capability and autonomously determines the appropriate bandwidth to use. This self-service approach shifts the complexity from the system to the terminal, maintaining communication reliability while reducing system complexity and signaling overhead.
Data Source
AI summary
A terminal includes a reception unit that receives system information; and a control unit that sets a default channel bandwidth as a frequency bandwidth for performing communication, the default channel being set in a duration after the reception unit receives the system information until the reception unit receives configuration information of a supported channel bandwidth, in response to detecting that the reception unit does not support a channel bandwidth included in the received system information.