5G UE Preamble Selection for System Information Acquisition
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Solution Overview
Problem
In 5G systems, user equipment (UE) faces challenges in efficiently acquiring multiple pieces of system information (SI) during the SI request process due to the limited nature of preamble sequences and various SI types.
Innovation Solution
The UE method involves receiving associations between preamble sequences and SIBs/SI from the base station, selecting a preamble sequence based on criteria such as the greatest number of required SIBs, fewest not-required SIBs, or different priorities, and transmitting the selected preamble sequence to request the necessary SI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE sends a preamble sequence to request system information, then the base station transmits system information on a predetermined time-frequency resource, but the limited number of preamble sequences cannot support acquiring multiple pieces of system information efficiently
Solution Approach 1:
The patent segments the system information into different types (first system information and second system information) and associates different preamble sequences with different combinations of system information types. This segmentation allows the UE to request multiple pieces of system information by selecting appropriate preamble sequences, resolving the contradiction between limited preamble sequences and the need to acquire multiple SIs.
Solution Approach 2:
The patent makes preamble sequences multi-functional by associating each preamble sequence with multiple system information types rather than one-to-one mapping. A single preamble sequence can trigger transmission of multiple different SIs, thereby increasing the adaptability and versatility of the system without requiring a separate preamble for each SI type.
2Loss of information
If the UE requests multiple pieces of system information, then the UE can acquire comprehensive SI data, but the redundancy in transmission and processing increases
Solution Approach 1:
The patent applies local quality by differentiating between first system information and second system information with different acquisition requirements. The UE selectively requests specific combinations of SIs based on its needs rather than requesting all available SIBs, thereby reducing redundancy while ensuring necessary information is obtained. The base station also transmits only the requested SI types associated with the selected preamble sequence.
Data Source
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AI summary
The present disclosure provides a method executed at UE, comprising: receiving, from a base station, information carrying direct or indirect associations between preamble sequences and system information blocks (SIBs); selecting a corresponding preamble sequence based on one or a plurality of required SIBs and the received associations according to at least one of the following criteria: selecting a single preamble sequence associated with the greatest number of required SIBs; selecting a single preamble sequence associated with the fewest number of not-required SIBs; selecting one or a plurality of preamble sequences associated with the one or plurality of required SIBs having the fewest total number; and selecting, according to a priority of the one or plurality of required SIBs, different preamble sequences respectively associated with required SIBs of different priorities; and transmitting the selected preamble sequences to the base station so as to send a request to the base station for the one or plurality of required SIBs. The present disclosure further provides corresponding UE and a computer-readable medium.