Idle Mode Cell Reselection Priority Fallback
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Solution Overview
Problem
In wireless communication networks, user equipment (UE) in idle mode may remain camped on suboptimal cells due to empty cell reselection priority configurations in dedicated signaling, leading to poor network conditions and user experience.
Innovation Solution
The UE receives system information indicating a cell reselection priority configuration and connects to a different cell in idle mode when the dedicated signaling's cell reselection priority configuration is empty, using the system information-based priorities for cell reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE uses empty dedicated cell reselection priority configuration from signaling, then the network signaling is simplified, but the UE remains camped on suboptimal cells leading to poor network conditions
Solution Approach 1:
The patent introduces system information as an intermediary source of cell reselection priority configuration. When dedicated signaling contains empty priority information, the UE falls back to using system information broadcast by the base station, which provides default priority configurations. This intermediary mechanism ensures that UEs can perform cell reselection with valid priority information rather than being stuck with empty dedicated configurations, thereby improving network performance while maintaining signaling simplicity.
2Adaptability or versatility
If the UE relies on dedicated signaling for cell reselection priority, then the configuration is UE-specific and optimized, but the UE cannot perform reselection when dedicated signaling is empty or unavailable
Solution Approach 1:
The patent implements preliminary action by having the UE acquire system information containing cell reselection priority configurations before dedicated signaling is received or as a fallback when dedicated signaling is empty. This pre-acquisition of priority information from system information ensures that the UE is always equipped with valid reselection priorities, enabling it to perform cell reselection operations even when UE-specific dedicated signaling is not available or contains empty configurations.
3Measurement precision
If the network provides detailed dedicated cell reselection priorities, then the UE can make precise reselection decisions, but the signaling overhead increases
Solution Approach 1:
The patent applies partial action by providing cell reselection priority information through system information broadcast to all UEs, which covers the common case needs. Dedicated signaling with UE-specific priorities is then used only partially - specifically when the UE requires customized priority configurations. This layered approach provides precise reselection decisions when needed through dedicated signaling, while relying on system information for common scenarios, thereby reducing overall signaling overhead while maintaining measurement precision when required.
Data Source
AI summary
Methods and mechanisms for performing idle mode mobility procedures are provided. According to one aspect of the present disclosure, a method for wireless communication performed by a user equipment (UE) includes: receiving, from a base station (BS) on a first cell, system information indicating a first cell reselection priority configuration; receiving, from the BS, dedicated signaling indicating a dedicated cell reselection priority configuration, wherein the dedicated cell reselection priority configuration is empty; and connecting, while in an idle mode and in response to the dedicated cell reselection priority configuration being empty, to a second cell different from the first cell based on the first cell reselection priority configuration received in the system information.