User Equipment System Information Acquisition Guard Timer
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Solution Overview
Problem
In next-generation wireless communication systems, user equipment (UE) faces challenges in efficiently acquiring system information (SI) from base stations, particularly when there are insufficient paging occasions or when SI is not received within a predetermined time limit, leading to potential delays and increased power consumption.
Innovation Solution
The UE employs a guard timer to monitor for SI, conducts failure procedures based on SI type, and uses default system information blocks to expedite cell reselection when SI is not acquired, allowing for parallel monitoring and request of SI during RACH procedures to ensure timely acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors for system information without a time limit, then the SI acquisition success rate may improve, but the power consumption increases and unnecessary attempts are made
Solution Approach 1:
The patent applies preliminary action by establishing a guard timer before attempting SI acquisition. The timer is configured with a maximum duration, and the UE determines whether to attempt SI reception based on whether the current time exceeds the guard timer value. This preliminary time-based filtering prevents unnecessary monitoring attempts that would waste power, while still allowing SI acquisition when conditions are favorable.
2Use of energy by moving object
If the UE waits for paging occasions to receive SI, then power consumption is reduced, but delays occur when SI is urgently needed
Solution Approach 1:
The patent applies dynamics by making the SI monitoring behavior adaptive based on UE state and timing conditions. When the UE is in idle state and the current time does not exceed the guard timer, the UE monitors for SI. When connected or when timing conditions aren't met, the UE relies on paging occasions. This dynamic adjustment optimizes both power consumption and acquisition speed based on operational context.
Solution Approach 2:
The patent utilizes periodic action through paging occasions, where the UE monitors for SI at predetermined intervals defined by the network. This periodic monitoring reduces power consumption by keeping the receiver dormant between paging occasions, while still ensuring SI delivery at regular intervals. The system balances energy efficiency with timely information delivery through this periodic approach.
3Loss of time
If the UE monitors for SI immediately upon cell access, then acquisition time is reduced, but power consumption increases during RACH procedures
Solution Approach 1:
The patent applies preliminary action by configuring the guard timer before the RACH procedure begins. The network provides the guard timer configuration in advance, allowing the UE to plan its SI monitoring strategy. During the RACH procedure, the UE can immediately attempt SI acquisition if the current time is within the guard timer window, reducing acquisition time while avoiding unnecessary monitoring if the timer has already expired.
Data Source
AI summary
Various aspects relate to acquisition of system information (SI). In some examples, a UE uses a guard timer to control how long the UE attempts to acquire a particular type of SI. In some examples, a UE that has entered a cell may determine whether there are any remaining paging occasions (e.g., that may indicate an SI update) during a period of time. If there is an insufficient number of paging occasions remaining (e.g., zero or one), the UE may monitor for broadcast SI. In some examples, after sending a request for SI to a base station, a UE may also periodically monitor for SI broadcast by the base station (e.g., to avoid potential delays in obtaining the SI). In some examples, if a UE does not acquire SI, the UE may use default SIB information (e.g., that expedites reselection to another cell).