CS Fallback Carrier Selection for Load Balancing
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Solution Overview
Problem
In LTE networks, circuit switched fallback procedures face challenges in efficiently selecting target UTRAN cells for handover, leading to uneven load distribution across multiple carriers, which can result in service delays and inefficiencies.
Innovation Solution
A method is introduced to select a target UTRAN cell based on load states of carriers, using either available load information to choose the carrier with the lowest load or employing a round robin method to distribute the load evenly, ensuring efficient handover and service provision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple carriers are allocated to a UTRAN cell for CS fallback service, then the service coverage and capacity are improved, but the load distribution becomes uneven and service delays occur
Solution Approach 1:
The patent implements dynamic carrier selection based on real-time load states. The eNodeB monitors the load of multiple carriers and dynamically selects the carrier with the lowest load for CS fallback handover, rather than using static allocation. This dynamic adaptation ensures even load distribution and prevents service delays while maintaining the benefit of multiple carriers for expanded service coverage.
2Productivity
If carrier selection is based on load states, then load distribution is balanced and service efficiency is improved, but the system complexity increases
Solution Approach 1:
The patent employs a feedback mechanism where the eNodeB monitors the load states of multiple carriers and uses this information to make informed carrier selection decisions. The load state information is continuously fed back to the selection mechanism, enabling adaptive carrier choice that balances load distribution. This feedback-driven approach improves service efficiency while the complexity is managed through standardized monitoring protocols.
3Reliability
If round robin method is used for carrier selection, then load distribution is evenly balanced, but the responsiveness to actual load conditions decreases
Solution Approach 1:
The patent changes the selection parameter from fixed round-robin ordering to dynamic load-state-based selection. By monitoring actual carrier load parameters and selecting the carrier with the lowest current load, the system achieves both even load distribution and fast response to changing network conditions. This parameter adaptation allows the system to respond quickly to load variations while maintaining balanced distribution.
Data Source
AI summary
Described embodiments provide a method of a circuit switched (CS) fallback procedure at a first network providing only a packet switched (PS) service. A CS fallback procedure may be initiated upon a receipt of a call associated with a CS service. One of carriers assigned to a second network that provides a circuit switched (CS) service may be selected. Then, a second network cell mapped to a serving cell of the first network and using the selected carrier may be selected as a target cell. The user equipment may be handed over o to the selected second network cell in order to provide a requested CS service.