Inter-RAT Selector for Autonomous Radio Access Technology Control
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Solution Overview
Problem
Mobile devices transferring data are often unexpectedly switched to 2G access technology by the network, leading to a significant drop in data transfer speed, causing inconvenience to users and potential coverage issues when 3G or LTE conditions are weak, and users lack control over radio access technology selection.
Innovation Solution
A mobile terminal with an inter-RAT selector that dynamically enables and disables 2G access based on specific criteria such as data activity, coverage levels, and voice channel usage, updating network registration to prevent unwanted inter-RAT decisions from the network, allowing autonomous selection between 2G and later generation technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network controls inter-RAT decisions based on standard criteria, then network coverage and connectivity are maintained, but data transfer speed drops significantly when switched to 2G technology
Solution Approach 1:
The patent segments the inter-RAT selection control into two parts: network-controlled decisions based on coverage criteria, and device-controlled decisions based on service quality criteria. The mobile device autonomously determines whether to switch to 2G technology by evaluating data transfer speed requirements, packet buffer status, and voice channel conditions, while the network maintains authority over coverage-based decisions. This segmentation allows the device to prevent unwanted switches to 2G when data transfer performance would deteriorate.
Solution Approach 2:
The mobile device performs self-service by autonomously monitoring its own data transfer performance, packet buffer status, and radio conditions to make informed inter-RAT decisions. The device evaluates whether switching to 2G would harm data transfer speed by checking if data is being transferred, whether the packet buffer is full, and what the current throughput is, then independently decides whether to switch or remain on 3G/LTE technology.
2Ease of operation
If the mobile device autonomously selects RAT based on radio quality threshold, then device control over connection quality is improved, but network coordination and standard compliance deteriorate
Solution Approach 1:
The patent divides decision-making authority between network and device: the network controls switches based on coverage criteria (standard-compliant), while the device controls switches based on service quality criteria (performance-optimized). The device monitors data transfer conditions and independently decides whether to switch to 2G, supplementing network control without violating standard protocols.
Solution Approach 2:
The patent introduces dynamic, condition-based autonomous decision-making at the device level. Instead of a fixed radio quality threshold, the device dynamically evaluates multiple conditions including whether data is being transferred, packet buffer status, current throughput levels, and voice channel availability. This dynamic approach allows the device to adapt its inter-RAT decisions to real-time service requirements while maintaining standard compliance through coordinated operation with network control.
3Reliability
If the device switches to 2G when radio quality falls below threshold, then connection reliability is maintained, but data transfer performance deteriorates
Solution Approach 1:
The patent replaces the static radio quality threshold with a dynamic, multi-condition evaluation system. The device monitors whether data is being transferred, checks packet buffer status, measures current throughput, and evaluates voice channel conditions. This dynamic approach allows the device to maintain connection reliability by switching to 2G when appropriate while preventing switches that would harm data transfer performance, adapting decisions to real-time service requirements.
Solution Approach 2:
The patent changes the decision parameter from a single radio quality threshold to multiple service-specific parameters including data transfer status, packet buffer fullness, throughput level, and voice channel availability. By monitoring and responding to changes in these parameters, the device can make informed decisions that maintain connection reliability while preserving data transfer performance when possible.
Data Source
AI summary
A mobile terminal comprising: transceiver apparatus for accessing a wireless network using an earlier and a later generation radio access technology, to establish a voice channel and packet data channel; and an inter radio access technology selector configured to monitor a condition for disabling the earlier generation access, being a condition other than coverage under the earlier generation technology falling below an acceptable lower level. The selector makes inter radio access technology decisions dynamically from the mobile terminal by updating registration with the network to indicate that the earlier generation technology is no longer supported. The selector thereby prevents the mobile terminal being subject to decisions from the network that would otherwise impose transfer to the earlier generation. At least some of the decisions made from the mobile terminal thus disable the earlier generation access whilst in presence of at least the lower level of coverage under the earlier generation.