On-Demand System Information Transmission for Unlicensed Spectrum
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Solution Overview
Problem
In communication systems, especially in unlicensed spectrum cells, the periodic broadcasting of system information (SI) leads to inefficient use of radio resources and interference with other cells, as all user equipment must receive SI repeatedly, even if only a subset is needed, and channel detection is required before data transmission.
Innovation Solution
A method where user equipment can request system information from a base station within predetermined SI windows, allowing for targeted and efficient transmission of only the required SI, reducing unnecessary overhead and interference by using pre-allocated request resources and indicating successful frequency resource acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information is periodically broadcast to all user equipment, then all UEs can access the cell and work normally, but radio resources are occupied inefficiently and interference is caused to other cells
Solution Approach 1:
The patent extracts only the necessary system information that specific UEs need, rather than broadcasting all SI to all UEs. UEs send requests indicating which SIBs they need, and the base station transmits only those specific SIBs to requesting UEs, eliminating redundant transmissions and improving radio resource efficiency while maintaining reliable access.
Solution Approach 2:
The patent introduces dynamic SI transmission where the base station adapts its transmission behavior based on real-time UE requests. Instead of fixed periodic broadcasting, the system dynamically determines what SI to transmit based on actual UE needs, allowing the network to optimize resource usage while ensuring each UE receives the specific information it requires for cell access and operation.
2Loss of information
If system information is repeatedly broadcast, then all UEs can receive the information, but unnecessary overhead increases and interference to other cells increases
Solution Approach 1:
The patent extracts and transmits only the specific SIBs that UEs actually need, rather than repeatedly broadcasting all SI. UEs indicate their information needs through requests, and the base station transmits only those specific SIBs, eliminating redundant transmissions that cause interference while ensuring complete delivery of necessary information.
Solution Approach 2:
The patent applies partial action by transmitting only the subset of SI that UEs need rather than all SI. This partial transmission approach reduces overhead and interference while still achieving complete delivery of the necessary information subset for each UE's operational needs.
3Adaptability or versatility
If channel detection is performed before data transmission in unlicensed cells, then spectrum sharing is enabled, but SI transmission efficiency decreases due to LBT requirements
Solution Approach 1:
The patent applies preliminary action by having UEs send SI requests before the actual SI transmission. This allows the base station to prepare and transmit only the necessary SIBs in subsequent transmissions, reducing the impact of LBT delays and improving overall SI transmission efficiency while maintaining spectrum sharing through channel detection.
Solution Approach 2:
The patent introduces dynamic SI transmission that adapts to LBT outcomes. When channel detection succeeds, the base station can efficiently transmit requested SIBs; when it fails, the system can retry or adjust transmission timing. This dynamic approach maintains spectrum sharing while optimizing SI transmission efficiency based on actual channel conditions.
Data Source
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AI summary
Embodiments of the present invention provide an SI transmission method, a base station, and user equipment. The method includes: sending a request to a base station, where the request is used to request at least one type of SI of a first-type cell, and the first-type cell is a cell on which channel detection needs to be performed before data is sent; and receiving the at least one type of SI of the first-type cell. In the embodiments of the present invention, UE requests a system message from a base station based on a requirement, so that unnecessary SI overheads can be reduced, and interference caused by the base station to another cell can be reduced.