System Information Transmission Subframe Scheduling for LBT Delay Reduction
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Solution Overview
Problem
In mobile communication systems, the long transmission time period due to the Listen Before Talk (LBT) mechanism at non-licensed frequency bands leads to increased access time delay and potential cell reselection issues for User Equipment (UE) when transmitting System Information Blocks (SIBs).
Innovation Solution
The method involves determining and scheduling a shared transmission subframe for both primary and secondary system information blocks using scheduling information, allowing simultaneous transmission within the same subframe, thereby reducing the impact of longer transmission periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the Listen Before Talk (LBT) mechanism is used for transmitting system information at non-licensed frequency bands, then the transmission can be performed in a relatively short time period, but the access time delay increases and cell reselection may occur due to the long time period required for LBT
Solution Approach 1:
The patent applies preliminary action by having the network device transmit scheduling information in advance that indicates the transmission time of system information. This allows the UE to prepare and know the exact timing before the actual transmission occurs, reducing access time delay. The scheduling information is sent beforehand to configure the UE's reception parameters, enabling efficient time management during the LBT process.
2Productivity
If system information is transmitted using the LBT mechanism at non-licensed frequency bands, then the transmission can be completed quickly, but the actual transmission period becomes longer due to LBT failures, causing increased access time delay
Solution Approach 1:
The patent implements feedback by having the network device provide scheduling information that indicates the transmission time of system information. This feedback mechanism allows the UE to adjust its reception parameters based on the actual transmission timing, ensuring reliable reception even when LBT causes delays. The scheduling information acts as a feedback loop that coordinates between the network device and UE to maintain transmission reliability.
3Duration of action of stationary object
If the transmission time period for system information is extended due to LBT mechanism, then more time is available for transmission, but the access time delay increases and cell reselection may occur
Solution Approach 1:
The patent uses preliminary action by transmitting scheduling information in advance that specifies the transmission time. This allows the UE to prepare its reception parameters beforehand, ensuring that when the system information is transmitted (even after LBT delays), the UE is already positioned to receive it efficiently, thus minimizing access time delay despite the extended transmission period.
Data Source
AI summary
A method and a device for transmitting system information, a UE and a network device are provided. The method includes: acquiring scheduling information transmitted from a network device; determining a transmission subframe scheduled by the network device for the system information in accordance with the scheduling information, the system information including first system information and/or second system information, the first system information being system information of a first type, the second system information being system information of a second type; and receiving the system information transmitted from the network device within the transmission subframe.