Mobile Device Cell Size Determination for Heterogeneous Network Handover
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Solution Overview
Problem
In heterogeneous communication networks, mobile devices lack the ability to dynamically optimize handover procedures due to lack of cell size information, leading to increased handover failure rates and interference issues, especially when transitioning between macro and small cells.
Innovation Solution
A method where mobile devices measure reference signal power and quality variations to determine cell information, allowing for adjustments in resource management procedures such as handover triggers, uplink power control, and link adaptation, enabling them to optimize handover decisions based on cell type and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network-controlled handover procedures are used in heterogeneous networks, then handover decisions can be centralized managed, but mobile devices cannot dynamically optimize handover based on real-time cell characteristics leading to increased handover failure rates
Solution Approach 1:
The mobile device autonomously determines cell size by measuring reference signal power variations and dynamically adjusts handover parameters without requiring network control. The device self-optimizes its resource management procedures based on real-time cell characteristics, eliminating the need for centralized handover decisions while improving handover reliability in heterogeneous networks
Solution Approach 2:
The mobile device continuously measures reference signal power and quality variations to determine current cell size, then uses this feedback information to dynamically adjust handover triggers and resource management procedures. This closed-loop feedback mechanism enables adaptive optimization of handover decisions based on real-time cell characteristics
2Stability of the object's composition
If measurement reports use L3 filtering, then signal measurements are smoothed, but time delay increases and real-time link quality is not represented
Solution Approach 1:
Instead of applying full L3 filtering to all measurements, the device uses partial filtering only for specific parameters like reference signal power to determine cell size. This selective filtering approach maintains measurement stability where needed while avoiding excessive time delays in real-time link quality assessment and handover decision-making
3Duration of action of moving object
If large Time-to-Trigger is used in macro cells, then handover is delayed, but communication loss rate increases and radio link failure probability increases
Solution Approach 1:
The mobile device dynamically adjusts the Time-to-Trigger parameter based on the determined cell size. In macro cells with larger coverage areas, the device uses longer Time-to-Trigger values to avoid excessive handover frequency. In small cells, the device uses shorter Time-to-Trigger values to maintain timely handovers. This dynamic adaptation resolves the contradiction between handover delay and communication reliability
4Device complexity
If UE provides only L3 filtered measurements to network, then measurement reporting is simplified, but network cannot access real-time link quality information
Solution Approach 1:
The device segments measurement reporting into two distinct functions: (1) L3 filtered measurements are reported to the network for general resource management, and (2) real-time reference signal power and quality measurements are retained locally for autonomous cell size determination and handover optimization. This segmentation allows the network to receive simplified measurements while the device maintains access to real-time link quality information for self-optimization
Data Source
AI summary
Devices and methods for adjusting resource management procedures in a mobile device communicating with a node operating in a cell in a heterogeneous communication network are disclosed. In one aspect, a method includes receiving a signal, including a reference signal, transmitted from the node during a predetermined time period, measuring signal reception information, including reference signal power values, at predetermined time intervals during the predetermined time period, measuring speeds of movement of the mobile device at the predetermined time intervals, determining a reference signal power variation value based on the variability of the measured reference signal power values, comparing the determined reference signal power variation value with a predetermined power threshold value for a given measured speed, determining cell information based on the comparison, determining an adjustment to a resource management procedure based on the determined cell information, and adjusting the resource management procedure based on the determined adjustment.