Wireless Handover Measurement Reporting for CSG Cells
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Solution Overview
Problem
Current wireless communication systems face challenges in handover procedures between macro eNBs and HeNBs, particularly with CSG and hybrid cells, due to issues like inadequate measurement events, excessive signaling, service interruptions, and inefficient battery usage, especially in dense deployments.
Innovation Solution
The implementation of specific measurement reporting criteria and handover evaluation techniques that differentiate between macro, CSG, and hybrid cells, including the use of CSG types and prioritization mechanisms to optimize handover processes, reduce unnecessary evaluations, and conserve battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement reporting criteria are applied to all cells (macro, CSG, hybrid), then measurement precision is improved, but device complexity increases and battery power is excessively consumed
Solution Approach 1:
The patent segments the measurement reporting process by cell type. Different measurement criteria and reporting requirements are defined for macro cells, CSG cells, and hybrid cells. This segmentation allows the system to apply appropriate measurement precision to each cell type without uniformly increasing complexity across all cells, thereby resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent implements local quality by applying different measurement reporting criteria to different cell types based on their specific characteristics. CSG cells use access restriction checks and CSG-specific reporting, while macro cells use traditional reporting criteria. This localized approach ensures measurement precision where needed while avoiding unnecessary complexity in other areas.
2Reliability
If comprehensive handover evaluation is performed for all neighboring cells, then reliability of handover is improved, but use of energy increases due to battery consumption
Solution Approach 1:
The patent extracts and removes unnecessary handover evaluation steps for certain cell types. For CSG cells, the system performs access restriction checks and CSG-specific evaluations instead of comprehensive handover evaluations. This extraction of unnecessary steps maintains handover reliability for appropriate cells while significantly reducing battery power consumption by avoiding redundant evaluations.
Solution Approach 2:
The patent applies partial action by performing only the necessary handover evaluation steps based on cell type. For macro cells, full handover evaluation is performed to ensure reliability. For CSG cells, only access restriction checks and CSG-specific criteria are evaluated. This partial approach ensures reliability where needed while conserving battery power by avoiding excessive evaluation actions.
3Reliability
If measurement reporting is performed for CSG cells with access restriction checks, then service continuity is improved, but loss of time occurs due to additional evaluation steps
Solution Approach 1:
The patent performs preliminary access restriction checks for CSG cells before initiating full handover procedures. By checking CSG membership and access permissions in advance, the system ensures service continuity for authorized users while avoiding time-consuming rejections later in the process. This preliminary action maintains reliability while minimizing time loss through efficient pre-screening.
4Productivity
If differentiated measurement criteria are used for macro, CSG, and hybrid cells, then productivity of handover process is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic measurement criteria that adapt based on cell type and user context. The system dynamically selects appropriate measurement and reporting criteria for macro cells, CSG cells, and hybrid cells based on their characteristics and the user's subscription status. This dynamic approach improves handover process productivity by applying the right criteria efficiently, while the systematic framework manages device complexity through organized conditional logic.
Data Source
AI summary
A system and method for mobility in a wireless network are presented. A user equipment with a processor configured to inform a network component of a closed subscriber group (CSG) capability of the UE. The processor informs the network component during capability exchange signaling. The processor informs the network component whether the UE is capable of detecting a CSG cell and whether the UE is a member of at least one CSG.