Autonomous CSG Cell Search Optimization
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Solution Overview
Problem
User devices in wireless communication networks experience unnecessary battery drain and increased current consumption due to frequent measurements of Closed Subscriber Group (CSG) cells, even when not subscribed or not in range, leading to inefficient resource usage and service access.
Innovation Solution
Implementing a user device with a CSG selection subsystem that autonomously detects and measures CSG cells using serving macro cell information, neighboring macro cells, GPS coordinates, available WiFi networks, time, day, context sensor data, and direction/orientation data to determine proximity and adjust search frequency dynamically, minimizing unnecessary searches and measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the user device continuously measures all CSG cells in range, then the device can quickly detect and camp on the home CSG cell, but this causes unnecessary battery drain and current consumption when the device is not a member or not in proximity to the CSG cell
Solution Approach 1:
The network pre-configures measurement parameters and CSG cell information in system information broadcasts before the user device needs to perform measurements. This allows the device to have measurement guidance ready in advance, reducing the need for continuous blind searching and enabling faster targeted detection of relevant CSG cells.
Solution Approach 2:
The patent implements dynamic adjustment of measurement parameters based on device state, location, and subscription information. The measurement behavior adapts to current conditions - when the device is a CSG member and in range, measurements are performed; when not a member or out of range, measurements are reduced or suspended. This dynamic approach optimizes the balance between detection speed and energy consumption.
2Reliability
If the user device performs frequent CSG cell measurements to ensure quick access, then service availability is improved, but network resource usage and device current drain increase
Solution Approach 1:
The patent applies different measurement strategies and parameter settings based on the specific CSG cell and device context. CSG member devices receive different measurement configurations than non-member devices. The measurement behavior is localized to relevant CSG cells rather than uniformly applied to all detected cells, optimizing both reliability and energy efficiency for each specific scenario.
Solution Approach 2:
The network dynamically changes measurement parameters such as measurement intervals, threshold values, and search frequencies based on device subscription status, location, and service requirements. This parameter adaptation allows the system to maintain service availability when needed while reducing measurements to conserve energy when CSG access is not relevant to the current device state.
3Adaptability or versatility
If the network broadcasts CSG cell information in all macro cells, then all UEs can potentially detect CSG cells for access, but this results in unnecessary measurements by non-CSG members and increases overall network load
Solution Approach 1:
The system uses universal system information broadcasts that contain CSG cell information accessible to all UE types, but the interpretation and action taken on this information varies by device capability and subscription. The same broadcast mechanism serves both CSG members and non-members, with members performing measurements and non-members ignoring or minimally processing the information, achieving versatility without proportionally increasing network load.
Data Source
AI summary
Methods and systems for autonomous search for Closed Subscriber Groups (CSGs) cells in wireless networks are disclosed. A user device determines current situational indicators of the user device and compares the current situational indicators to previously-recorded situational indicators stored in the user device. The user device also selects, based on the comparison, a closed subscriber group (CSG) cell from a list of CSG cells in the user device. Lastly, the user device searches for the CSG cell based on a proximity of a first location associated with the current situational indicators of the user device to a second location associated with the previously-recorded situational indicators of the CSG cell.