Wireless Network Cell Replacement Logic for Call Drop Prevention
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Solution Overview
Problem
In wireless communication systems, the current method of handling measurement reporting can lead to a race condition where cells with good signal strength are unnecessarily replaced, causing call drops due to incorrect interpretation of measurement report messages by the network, especially when the active set is updated without corresponding updates being sent to the user equipment.
Innovation Solution
A method where the network receives measurement report messages and determines whether the cell identity mentioned in the message is included in the active set and whether the number of cells in the active set exceeds a threshold before performing cell replacement, thereby avoiding unnecessary replacements and call drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network receives measurement report messages and performs cell replacement based on the reported cell identities, then the measurement reporting function is achieved, but race conditions occur causing cells with good signal strength to be unnecessarily replaced, leading to call drops
Solution Approach 1:
The network performs preliminary verification by checking whether the reported cell identity is included in the active set before executing cell replacement. This preliminary check prevents unnecessary replacements and call drops caused by race conditions, while maintaining proper synchronization of active set updates.
Solution Approach 2:
The network uses feedback from the active set maintenance module to verify the current state of the active set before processing measurement reports. This feedback mechanism ensures that cell replacement decisions are based on the most current active set configuration, preventing race conditions and unnecessary call drops.
2Stability of the object's composition
If the network updates the active set internally without sending update messages to the UE, then internal consistency is maintained, but the UE and network become desynchronized, causing incorrect interpretation of measurement reports
Solution Approach 1:
The network maintains feedback loops between the active set maintenance module and the measurement report processing module. This ensures that both modules operate with consistent information about the current active set state, preventing desynchronization even when internal updates occur without immediate UE notification.
Solution Approach 2:
Before processing measurement reports, the network performs preliminary verification against the current active set state. This preliminary action ensures that the network and UE remain synchronized in their understanding of which cells are currently in the active set, preventing incorrect interpretation of measurement reports.
3Productivity
If the UE sends measurement report messages periodically or after TTT intervals, then measurement monitoring is maintained, but unnecessary measurement report messages are sent when the active set has already been updated, causing additional race conditions
Solution Approach 1:
The network processes measurement report messages with partial verification - checking only the critical aspect of whether the reported cell identity is in the active set. This selective verification approach maintains measurement reporting efficiency while preventing the most critical race condition errors that would cause call drops.
Data Source
AI summary
A method of handling measurement reporting for a network in a wireless communication system is disclosed. The network maintains an active set for storing at least a cell identity which is capable of providing a service to a mobile device of the wireless communication system. The method includes receiving a measurement report message from the mobile device, wherein the measurement report message is used for notification of a cell replacement procedure and includes a first cell identity corresponding to a first cell, determining whether the first cell identity is included in the active set and whether a number of the cell identity in the active set exceeds a threshold, to generate a result, and performing the cell replacement procedure according to the result.