UE System Information Request Adjustment via Dynamic Message Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G systems, user equipment (UE) may resend SI requests in new SI modification periods without updating the message type, leading to unnecessary SI broadcasting by the base station, as UE may have received part of the requested SI in the previous period.
Innovation Solution
The UE adjusts SI requests by sending a new SI request through a new MSG1 or MSG3 when the previous request process is not completed and SI modification period changes, using different random access processes to avoid retransmitting unnecessary information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE resends the SI request in a new SI modification period using the same message type, then the SI request process can be completed, but the base station will broadcast SI that has already been received, causing unnecessary broadcasting
Solution Approach 1:
The patent applies dynamics by making the message type adaptive rather than static. The UE dynamically selects between MSG1 and MSG3 for SI requests based on its current state (idle or inactive) and the SI modification period context. This dynamic adaptation prevents the base station from broadcasting already-received SI while ensuring the request process completes reliably.
Solution Approach 2:
The patent changes the message type parameter (MSG1 vs MSG3) based on the SI modification period and UE state. By modifying this parameter, the system distinguishes between initial SI requests and repeat requests, enabling the base station to identify and avoid broadcasting duplicate SI while maintaining reliable request completion.
2Ease of operation
If the UE sends an SI request through MSG1 or MSG3, then the SI can be requested, but the message structure does not allow indicating whether SI was already received in the previous period
Solution Approach 1:
Instead of adding fields to indicate what SI was received, the patent inverts the approach by using different message types (MSG1 vs MSG3) to indicate the request context. The base station infers the UE's SI reception status from which message type is used, effectively conveying information through the choice of communication channel rather than through explicit data fields.
Solution Approach 2:
The message type (MSG1 or MSG3) acts as an intermediary that carries implicit information about the UE's SI reception status. Rather than directly transmitting status information, the selected message type mediates between the UE's internal state and the base station's broadcasting decision, enabling indirect but effective information transfer.
Data Source
AI summary
A system information (SI) request adjustment method includes: if a first system information block (SIB1) indicates that SI to be acquired by UE is not being broadcast, sending an SI request to a base station via a first message (MSG1) or a third message (MSG3); and if a present SI request process is not completed yet, and SI required to be requested within a next SI modification period that is entered changes relative to the SI requested in the present SI request process, sending a new SI request to the base station through a new MSG1 or a new MSG3.