Cell Selection Time Adaptation for On-Demand SSB
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Solution Overview
Problem
In wireless communication systems, determining a suitable target time length for cell selection when a terminal enters RRC_IDLE or RRC_INACTIVE state is challenging, as a time length that is too short may prevent cell evaluation, while a time length that is too long may cause delays in cell selection. Additionally, the availability of the first SSB group on demand affects the time required for cell evaluation.
Innovation Solution
A method where the target time length for cell evaluation depends on whether the first SSB group of the first cell is on demand. If the SSB group is on demand, the target time length is a first value, and if it is not on demand, the target time length is a second value, allowing for flexible and efficient cell selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the target time length for cell evaluation is set to be short, then the cell selection delay is reduced, but the cell evaluation may not be completed properly
Solution Approach 1:
The patent applies dynamics by making the target time length adjustable based on SSB transmission conditions. The terminal device dynamically adapts the evaluation time according to whether SSB is transmitted periodically or on-demand, allowing the system to optimize between speed and reliability in different operational contexts
Solution Approach 2:
The patent changes the time parameter based on SSB transmission mode. When SSB is transmitted periodically, a shorter target time length is used; when SSB transmission is on-demand, a longer target time length is allocated. This parameter adjustment resolves the contradiction between fast cell selection and reliable evaluation
2Reliability
If the target time length for cell evaluation is set to be long, then the cell evaluation can be completed properly, but the cell selection delay increases
Solution Approach 1:
The system dynamically adjusts the evaluation time based on actual SSB transmission conditions rather than using a fixed time length, allowing optimal balance between evaluation completeness and selection speed for different scenarios
Solution Approach 2:
The target time length parameter is changed according to SSB transmission mode (periodic vs on-demand), enabling the system to allocate appropriate time resources based on the actual measurement conditions
3Use of energy by moving object
If on-demand SSB transmission is used to save electricity, then energy consumption is reduced, but the cell evaluation time becomes uncertain
Solution Approach 1:
The patent adjusts the target time length parameter based on whether SSB transmission is periodic or on-demand. For on-demand transmission, a longer time length is allocated to account for the uncertainty in SSB availability, ensuring evaluation can complete when resources are present
Solution Approach 2:
The terminal device autonomously determines the appropriate evaluation time length based on the SSB transmission mode it detects, without requiring external configuration, enabling adaptive energy-efficient operation
Data Source
AI summary
Receiving a first signaling, and the first signaling indicating releasing an RRC connection; as a response to receiving the first signaling, entering RRC_IDLE state or RRC_INACTIVE state, accompanying the behavior of entering RRC_IDLE state or RRC_INACTIVE state, executing cell selection; the behavior of executing cell selection comprising evaluating a first cell within a target time length; the target time length depending on whether a first SSB group is on demand; the first SSB group belonging to the first cell; herein, the meaning of the phrase that the target time length depends on whether an SSB of the first cell is on demand comprises: when an SSB of the first cell is on demand, the target time length is a first value; when an SSB of the first cell is not on demand. The present application enables better cell selection in complex environments through the first signaling.