Cell Coverage Indicator Exchange for Adaptive Handover Control
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Solution Overview
Problem
Existing cellular wireless communication systems face challenges in maintaining optimal network performance when cell coverage changes dynamically, leading to suboptimal behavior due to the inability of mobility and neighbor relation optimization algorithms to adapt quickly enough to frequent cell coverage modifications.
Innovation Solution
A method for exchanging cell coverage indicators between network control nodes to facilitate adjustments in mobility and radio resource management parameters, allowing for timely adaptation to dynamic cell coverage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cell coverage changes dynamically to accommodate traffic variations, then network capacity and traffic accommodation improve, but mobility optimization algorithms cannot adapt quickly enough leading to handover failures and dropped calls
Solution Approach 1:
The patent applies preliminary action by proactively adjusting handover parameters and mobility settings in advance of actual handover events when cell coverage changes are detected. The network control node receives coverage change indications and pre-configures appropriate mobility parameters before handovers are needed, ensuring seamless transitions despite rapid coverage modifications.
Solution Approach 2:
The patent implements feedback mechanisms where the network control node continuously monitors handover performance metrics and cell coverage status. Based on this feedback, the system dynamically adjusts mobility parameters to maintain optimal handover success rates while adapting to changing coverage conditions, creating a closed-loop control system.
2Reliability
If mobility parameters are adjusted frequently to match dynamic cell coverage, then handover success rate improves, but system stability deteriorates due to excessive parameter changes
Solution Approach 1:
The patent applies dynamics by implementing time-varying mobility parameters that adapt to the current operational phase of the network. Different parameter sets are used during initial deployment versus mature operation, allowing the system to be more aggressive during setup and more conservative during stable operation, thus maintaining stability while enabling adaptation.
Solution Approach 2:
The patent employs periodic action through collection periods during which statistics are gathered before parameter adjustments are made. This periodic measurement and adjustment cycle prevents overly frequent changes by requiring sufficient data accumulation, thereby maintaining system stability while still enabling timely adaptations to coverage changes.
3Stability of the object's composition
If collection time for statistics is extended to ensure stable parameter adjustments, then system stability improves, but response time to coverage changes deteriorates
Solution Approach 1:
The patent applies dynamics by implementing time-varying collection periods that are shorter during initial deployment phases and longer during mature operation. This dynamic adjustment of the statistics collection duration allows rapid response when the network is evolving while ensuring stability during mature operation, resolving the trade-off between speed and stability.
4Reliability
If handover failure rate is reduced below target through aggressive parameter adjustments, then reliability improves, but handover count increases causing system overload
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting mobility parameters such as handover thresholds, offsets, and timing advance values based on current network conditions and coverage status. These targeted parameter modifications enable the system to reduce handover failures without triggering excessive handovers, as each parameter is optimized for the specific operational context rather than applying uniform aggressive adjustments.
Data Source
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AI summary
The present invention relates to a method for transmitting and receiving information in a cellular wireless communication system, said cellular wireless communication system comprising: a first network control node arranged for controlling at least one first cell of said cellular wireless communication system, a second network control node arranged for controlling at least one second cell of said cellular wireless communication system; said method comprising the steps of: transmitting, by said first network control node, a cell coverage indicator indicating a cell coverage for said first cell, receiving, by said second network control node, said cell coverage indicator, and using, by said second network control node, said cell coverage indicator for adjusting a cell coverage for said second cell and/or one or more radio resource management parameters associated with said second cell. Furthermore, the invention also relates to a method in a first network control node, a method in a second network control node, a first network control node device, a second network control node device, a computer program, and a computer program product thereof.