Femtocell Operation Mode Switching for Resource Efficiency
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Solution Overview
Problem
Femtocells face inefficiencies in operating modes, leading to limitations in radio resource utilization and service quality for users, particularly due to the need to manage frequency bands and handovers between macrocells and femtocells.
Innovation Solution
A method for femtocell operation that includes switching between modes based on handover criteria, such as power state, data rate thresholds, and service policies, allowing for efficient handover to macrocells or neighbor femtocells, and optimizing frequency resource allocation by prioritizing Closed Subscriber Group (CSG) users while enabling service to non-CSG users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a femtocell operates in a different frequency band from macrocell to reduce interference, then interference between femtocell and macrocell is reduced, but radio resource utilization efficiency deteriorates due to limited frequency resources for UEs near femtocell
Solution Approach 1:
The patent implements dynamic operation mode switching for the femtocell, transitioning between public mode (providing service to all UEs) and private mode (providing service only to CSG UEs) based on real-time conditions such as UE location, service requirements, and resource availability. This dynamic adaptation allows the system to optimize the balance between interference reduction and radio resource utilization efficiency.
2Reliability
If a femtocell provides service only to CSG terminals, then service quality for specific users is improved, but radio resource utilization deteriorates due to exclusion of non-CSG UEs
Solution Approach 1:
The patent implements dynamic operation mode switching for the femtocell, transitioning between public mode (providing service to all UEs) and private mode (providing service only to CSG UEs) based on real-time conditions such as UE location, service requirements, and resource availability. This dynamic adaptation allows the system to optimize the balance between service quality for CSG users and overall radio resource utilization.
Solution Approach 2:
The patent changes the accessibility parameter of the femtocell dynamically by switching between public and private modes. In public mode, the femtocell accepts connections from any UE, maximizing resource utilization. In private mode, it restricts access to CSG UEs only, ensuring service quality for subscribed users. This parameter change resolves the contradiction between exclusive service quality and overall resource efficiency.
3Reliability
If a femtocell is kept powered-on to provide continuous service, then service availability is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic monitoring of service conditions and dynamic switching between active and idle states. The femtocell remains active only when needed (when CSG UEs or non-CSG UEs require service) and transitions to idle state when no service is required, creating a periodic on-off pattern that reduces energy consumption while maintaining service availability when needed.
Solution Approach 2:
The patent makes the femtocell's operational state dynamic by switching between active and idle modes based on real-time service requirements. When UEs are present and require service, the femtocell activates; when no service is needed, it enters idle state. This dynamic state transition resolves the contradiction between continuous service availability and energy consumption.
4Reliability
If handover procedures are implemented for non-CSG UEs, then service continuity is improved, but system complexity increases
Solution Approach 1:
The patent extracts the handover management function from the femtocell itself and implements it at higher network levels (Gateway or Core Network). The femtocell simply provides service or not based on its mode, while the complex handover procedures are handled by dedicated network entities, reducing the complexity burden on the femtocell device while maintaining service continuity.
Data Source
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AI summary
A method for operating a femtocell in a wireless communication system comprises the steps of: triggering the switching from the operation mode for providing a service to closed subscriber group (CSG) terminals which belong to a specific terminal group and to non-CSG terminals which do not belong to the specific terminal group, to the operation mode for providing the service only to said CSG terminals; and commanding said non-CSG terminals to change the operation mode, and carrying out a handover. The method of the present invention improves efficiency of femtocell operation, and reduces restrictions on terminals disposed in the vicinity of the femtocell. The method of the present invention can utilize the unused frequency range of the femtocell, thereby providing a service with a high data ratio.