Mobile Station CSG Cell Reselection Control via CCN Indications
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Solution Overview
Problem
Current mobile station technologies lack effective control over reselection to Closed Subscriber Group (CSG) cells, particularly in scenarios where no Cell Change Notification (CCN) active indication is received, leading to potential service interruptions and inefficient network management.
Innovation Solution
The mobile station implements methods to determine whether reselection to a CSG cell is allowed and whether a Packet Cell Change Notification (PCCN) message is required, based on the absence or presence of CCN active indications for different radio access technologies (RATs) and information received from the serving cell, allowing for controlled reselection without explicit CCN active indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the mobile station allows autonomous reselection to CSG cells without receiving CCN active indications, then reselection flexibility and speed are improved, but service interruptions and network control loss occur
Solution Approach 1:
The mobile station performs preliminary assessment by checking for the presence or absence of CCN active indications for different RATs before initiating reselection to CSG cells. This preliminary action allows the device to determine in advance whether network control is required, enabling fast autonomous reselection when CCN indications are absent while maintaining reliability when they are present.
Solution Approach 2:
The reselection mechanism dynamically adapts its behavior based on the received CCN active indications. When CCN active indications are received for all known RATs, the mobile station assumes network control is required and sends PCCN messages. When no CCN active indication is received for a particular RAT, the mobile station autonomously allows reselection to CSG cells of that RAT without sending PCCN, thus dynamically adjusting control levels to optimize both speed and reliability.
2Reliability
If the mobile station sends PCCN for all CSG cell reselections, then network control is maintained, but signaling overhead and latency increase
Solution Approach 1:
The patent extracts the PCCN signaling requirement from the universal reselection process and applies it selectively only when necessary. By analyzing the presence or absence of CCN active indications for different RATs, the mobile station determines that PCCN is needed only when CCN active indications are present, while allowing autonomous reselection when they are absent, thus removing unnecessary signaling overhead and reducing latency.
Solution Approach 2:
The mobile station changes the control parameter (PCCN transmission requirement) based on the CCN active indication status for different RATs. This parameter change allows the system to switch between network-controlled reselection (when CCN active indications are present) and autonomous reselection (when they are absent), optimizing the balance between network control and reselection speed.
3Reliability
If the mobile station refrains from reselecting to CSG cells without CCN active indications, then network control is maintained, but reselection flexibility and user experience deteriorate
Solution Approach 1:
The patent segments the reselection control mechanism by RAT type based on received CCN active indications. Instead of applying a uniform network control policy across all RATs, the mobile station divides the decision-making process into RAT-specific segments, allowing autonomous reselection for RATs without CCN active indications while maintaining network control for RATs with such indications, thus improving flexibility without compromising overall network control.
Solution Approach 2:
The system dynamically adjusts reselection flexibility based on the CCN active indication status for each RAT. When CCN active indications are absent for a particular RAT, the mobile station dynamically increases flexibility by allowing autonomous reselection to CSG cells of that RAT. When CCN active indications are present, the system maintains network control. This dynamic adaptation optimizes both network control and reselection flexibility.
Data Source
AI summary
Systems and methods are provided for controlling whether a mobile station is permitted to perform a reselection to a CSG cell, and if reselection is allowed, whether a notification of cell change is required in advance. This control is based on CCN notifications for different radio access technologies.