Inter RAT Handover for Seamless Thermal Mitigation
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Solution Overview
Problem
Conventional thermal mitigation techniques in wireless communication systems, such as LTE fallback from NR in Standalone architecture, result in service interruptions and poor Quality of Service (QoS) due to the time-consuming process of dropping the NR session and camping on an LTE cell.
Innovation Solution
A method and system for managing inter Radio Access Technology (RAT) handover in a wireless communication system, where the User Equipment (UE) detects temperature levels and transmits requests to the network for a seamless handover from a higher priority RAT to a lower priority RAT before reaching a maximum temperature level, thereby avoiding service interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional thermal mitigation technique (LTE fallback from NR) is used when temperature rises, then temperature control is achieved, but service interruption occurs and Quality of Service deteriorates
Solution Approach 1:
The patent applies preliminary action by detecting temperature levels and initiating handover requests before the UE reaches maximum temperature. The system monitors temperature continuously and triggers inter-RAT handover at predefined temperature thresholds, allowing the handover process to start in advance rather than waiting for critical temperature conditions. This resolves the contradiction by enabling proactive thermal management that maintains service continuity.
Solution Approach 2:
The patent changes the parameter of handover timing from reactive (after temperature threshold exceeded) to proactive (before temperature threshold reached). By introducing multiple temperature levels and triggering handover at intermediate thresholds, the system transforms the single-threshold reactive approach into a multi-threshold proactive approach, maintaining both temperature control and service reliability.
2Temperature
If inter RAT handover is performed after reaching maximum temperature level, then thermal mitigation is achieved, but handover time increases and QoS is affected
Solution Approach 1:
The system performs preliminary temperature monitoring and initiates handover procedures before maximum temperature is reached. By detecting intermediate temperature levels and triggering handover requests in advance, the patent reduces the actual handover execution time and minimizes service interruption, resolving the time loss contradiction.
Solution Approach 2:
The patent enables the handover process to be rushed through by pre-configuring measurement parameters and cell selection criteria before handover is triggered. When temperature thresholds are reached, the UE can quickly complete measurement and selection procedures without extensive processing delays, reducing overall handover duration while achieving temperature mitigation.
3Temperature
If LTE fallback is implemented when temperature increases, then thermal management is achieved, but service availability is lost during the process
Solution Approach 1:
The patent maintains service availability by performing preliminary temperature monitoring and initiating inter-RAT handover before service degradation occurs. The system continuously monitors temperature and triggers handover at predefined thresholds, ensuring seamless transition without service interruption, unlike conventional LTE fallback that causes service unavailability.
Solution Approach 2:
The patent ensures continuity of useful action by implementing inter-RAT handover that maintains active communication sessions throughout the transition. The system preserves data bearers and session continuity during handover from NR to LTE, eliminating service gaps and maintaining continuous productivity, whereas conventional fallback interrupts service completely.
Data Source
AI summary
A method of managing inter Radio Access Technology (RAT) handover of a User Equipment (UE) in a wireless communication system, includes: detecting, by the UE, a communication session established via a higher priority RAT managed by a network; determining, by the UE, whether measurements related to a lower priority RAT is configured in the UE by the network; detecting, by the UE, a temperature of the UE, the temperature being reaching each of a plurality of pre-defined temperature levels, wherein the plurality of pre-defined temperature levels are lesser than a pre-defined maximum temperature level; and transmitting, by the UE, one or more requests to the network for performing inter RAT handover from the higher priority RAT to the lower priority RAT, based on the determined measurements and the detected communication session.