Unlicensed MIB Transmission via LBT and Fallback
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Solution Overview
Problem
Existing communication schemes fail to ensure reliable transmission of the Master Information Block (MIB) on unlicensed frequency bands, leading to communication failures due to channel occupancy by other devices, which affects time synchronization and network efficiency.
Innovation Solution
A communication method that configures and selects serving cells to form primary cell or primary secondary cell groups, employing a channel detection mechanism to send the MIB independently or in dual connectivity scenarios, ensuring the MIB is transmitted efficiently and reliably.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a Listening Before Talk (LBT) mechanism is used to occupy an unlicensed spectrum, then the channel access probability is improved, but the MIB transmission reliability deteriorates because the channel may be occupied by other devices preventing normal MIB sending
Solution Approach 1:
The patent applies preliminary action by performing channel detection (LBT mechanism) before attempting MIB transmission. The base station detects whether the unlicensed channel is idle before sending the MIB, and if the channel is busy, it waits and retries later. This preliminary channel assessment improves the likelihood of successful transmission while managing the reliability issue through retry logic and fallback mechanisms to licensed carriers.
2Device complexity
If the MIB is transmitted only in specific subframes with SFN as multiple of 4, then the transmission schedule is simplified, but the transmission probability deteriorates due to channel occupancy by other devices
Solution Approach 1:
The patent applies dynamics by making the MIB transmission schedule flexible rather than fixed. While the basic schedule follows SFN multiple of 4 subframes, the system dynamically adapts by retrying transmissions in subsequent opportunities when the channel is detected as idle. The base station can also dynamically switch between unlicensed and licensed carrier transmission based on channel conditions, maintaining simplicity while improving transmission probability.
3Quantity of substance
If unlicensed spectrums are used to increase network capacity, then the spectrum resource utilization is improved, but the communication reliability deteriorates due to channel detection mechanisms preventing continuous occupation
Solution Approach 1:
The patent uses the licensed carrier as an intermediary backup for MIB transmission. When the unlicensed channel is occupied or detection fails, the system falls back to transmitting the MIB on the licensed carrier. This intermediary mechanism allows the system to utilize unlicensed spectrum resources for capacity enhancement while maintaining communication reliability through the licensed carrier safety net.
Data Source
AI summary
The present disclosure provides a communication method and a communication device. The method includes: configuring at least one serving cell for each terminal, each of the at least one serving cell working on an unlicensed carrier; selecting at least one of the at least one serving cell as a primary cell or a primary secondary cell of the terminal, the selected serving cell forming a primary cell group or a primary secondary cell group of the terminal; and controlling the primary cell group or the primary secondary cell group to send a MIB to the terminal. The technical solution improves a transmission probability of the MIB of the primary cell group or the primary secondary cell group on an unlicensed frequency band, ensuring that a user receives the MIB in time to perform a time synchronization, the communication is normal, and delay and efficiency requirements of communication are met.