Inter-Frequency Handover Management for Location-Based Services
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Solution Overview
Problem
In multi-frequency band wireless networks, managing inter-frequency handovers to prevent service degradation due to network overload is challenging, particularly for location-based services, as existing methods do not effectively balance load across frequency bands to maintain quality of service.
Innovation Solution
The system determines a serving frequency for a location-based service on a wireless device and identifies a path through access node clusters with different positioning reference signal frequencies, setting criteria for handovers based on periodic scans and measurement gaps to optimize inter-frequency handovers, thereby reducing network overload and maintaining service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inter-frequency handover is implemented to balance network load, then service quality is improved, but handover management complexity increases
Solution Approach 1:
The system performs periodic scans of LBS frequencies before handover is needed, identifying suitable target frequencies in advance. This preliminary action allows the network to prepare handover parameters and reduce the complexity of real-time handover decisions, improving service quality while managing complexity through advance planning
Solution Approach 2:
The system implements measurement gap mechanisms where the wireless device continuously monitors LBS frequencies and reports back to the network. This feedback loop enables dynamic handover decisions based on real-time conditions, improving service quality while the automated feedback process manages the complexity of multi-frequency monitoring
2Reliability
If periodic scanning of LBS frequencies is performed, then handover decisions are improved, but network overhead increases
Solution Approach 1:
The system performs LBS frequency scans periodically rather than continuously, at predetermined intervals configured by the network. This periodic approach maintains adequate handover decision quality by sampling the network at regular intervals while significantly reducing network overhead compared to continuous monitoring
Solution Approach 2:
The system monitors only specific LBS frequencies that are configured and relevant to the wireless device's service requirements, rather than scanning all possible frequencies. This partial monitoring approach provides sufficient handover decision quality for the specific service while reducing overall network overhead
3Productivity
If multiple frequency bands are used for communication, then network capacity is improved, but service continuity becomes more difficult to maintain
Solution Approach 1:
The system introduces a serving frequency as an intermediary layer between the wireless device and multiple LBS frequencies. The serving frequency acts as a stable anchor point that maintains service continuity, while the device can scan and evaluate other LBS frequencies for potential handovers. This intermediary approach allows multi-band operation to improve network capacity while the serving frequency ensures service continuity during frequency transitions
Data Source
AI summary
Systems and methods are described for determining an inter-frequency handover condition for a wireless device. A serving frequency for a location based service (LBS) operating on a wireless device at a first location may be determined. A controller node may determine a path for the wireless device. The path may begin at the first location and continue through a plurality of access node clusters. Each access node cluster may comprise a positioning reference signal (PRS) frequency. The PRS frequency of the access node clusters may be different from the serving frequency. A set of criteria for performing a handover from the serving frequency to the PRS frequency of the access node cluster may be determined. One of the criteria may be performing a periodicity scan of the LBS. An inter-frequency handover of the wireless device from the serving frequency to the PRS frequency of the access node cluster may be requested.