System Information Update Notification for Radio Resource Optimization
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Solution Overview
Problem
The increasing number of user equipment (UEs) and the corresponding data and control information that base stations (BS) need to transmit, combined with limited radio resources, necessitate an efficient method for handling uplink/downlink data and control information transmission.
Innovation Solution
A method and apparatus for efficiently receiving and transmitting system information, involving the receipt of a system information update notification and the application of updated system information at specific times, including information on the length of the modification period and search space details for enhanced physical downlink control channels, to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station transmits system information to all user equipment in every modification period, then the system information is always up-to-date for all UEs, but the consumption of limited radio resources increases significantly
Solution Approach 1:
The patent applies local quality by differentiating between UEs that need system information updates and those that don't. The base station transmits update notifications only to specific UEs based on their individual needs and the type of system information modified, rather than broadcasting to all UEs uniformly. This selective approach maintains system information accuracy for those who need it while reducing overall radio resource consumption.
2Loss of time
If the base station transmits detailed system information updates immediately, then the user equipment can apply updates without delay, but the amount of data transmitted consumes more radio resources
Solution Approach 1:
The patent segments system information updates into two parts: a compact update notification containing only essential change information, and the full system information messages. The base station first transmits the segmented notification to alert UEs of changes, then UEs request or receive only the specific updated messages they need. This segmentation reduces immediate transmission overhead while ensuring timely updates.
Solution Approach 2:
The patent implements preliminary action by having the base station prepare and transmit update notifications in advance of full system information messages. The notification contains sufficient information for UEs to identify what has changed and when to expect full updates. This preliminary notification allows UEs to prepare for updates without requiring immediate transmission of complete system information, reducing resource consumption while maintaining timely application.
3Productivity
If the base station increases the frequency of system information transmissions, then user equipment receives updates more frequently, but the overhead for control signaling increases
Solution Approach 1:
The patent applies periodic action by establishing regular system information modification periods with predictable patterns. Instead of ad-hoc transmissions, the base station follows a periodic schedule where system information is updated at defined intervals. This periodic structure allows UEs to anticipate updates and efficiently manage their reception, reducing control signaling overhead while maintaining adequate update frequency for network operations.
Data Source
AI summary
A system information update notification may be transmitted/received in system information modification period n, updated system information may be transmitted/received in system information modification period (n+1), and the updated system information may be applied from a particular time point after the system information modification period (n+1). The updated system information may include EPDCCH configuration information or start OFDM symbol information which enables a UE to start control/data reception.