User Equipment Exceptional Resource Suspension for D2D Reliability
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Solution Overview
Problem
Current public safety networks face challenges in reliability and cost due to their reliance on outdated 2G technology, necessitating improved Device-to-Device (D2D) communication methods for enhanced service delivery, especially in scenarios where cellular coverage is insufficient or unavailable.
Innovation Solution
A D2D operation method for user equipment (UE) in a wireless communication system that involves starting the use of exceptional resources, determining conditions for suspending their use based on timers and information received from the network, and restarting timers as necessary to manage resource utilization effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If exceptional resources are continuously used for D2D operation in RRC idle state, then service continuity is maintained, but interference with cellular traffic increases and resource efficiency deteriorates
Solution Approach 1:
The patent implements periodic suspension of exceptional resource usage by introducing a timer mechanism. The UE suspends exceptional resource usage after a predetermined time period (T300 timer) and periodically checks whether to resume usage based on whether RRC connection is established. This periodic action prevents continuous interference while maintaining service continuity when needed.
Solution Approach 2:
The patent makes the exceptional resource usage dynamic by introducing state-based control. The UE dynamically switches between using and suspending exceptional resources based on RRC connection state, timer expiration, and network conditions. This dynamic approach allows the system to adapt resource usage to current network conditions, reducing interference when cellular traffic is active while maintaining service continuity when needed.
2Reliability
If exceptional resources are used for D2D operation, then direct communication reliability is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent employs periodic suspension mechanisms with timers (T300, T310) to limit exceptional resource usage duration. The UE periodically evaluates whether to continue using exceptional resources based on timer expiration and RRC connection status. This ensures that exceptional resources are used only when necessary for D2D communication, improving overall resource utilization efficiency while maintaining direct communication reliability during critical periods.
Solution Approach 2:
The patent changes the parameter of resource usage duration by introducing time-based constraints through timers. The exceptional resource usage is limited to specific time windows defined by timer configurations, transforming the resource usage pattern from potentially indefinite to time-bounded. This parameter change ensures that exceptional resources are released back to the cellular system after serving their purpose, improving resource utilization efficiency.
3Productivity
If timer-based suspension control is implemented, then resource management efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service resource management through autonomous timer-based control at the UE. The device automatically starts timers (T300, T310), monitors their expiration, and independently decides when to suspend or resume exceptional resource usage without continuous network intervention. This self-service approach simplifies network-side complexity while maintaining efficient resource management, as the UE autonomously handles the suspension control logic.
Data Source
AI summary
The present invention provides a method for the performance of a device-to-device (D2D) operation by a user equipment (UE) in a wireless communication system, the method comprising the steps of: starting to use an exceptional resource; determining whether a condition for suspending the use of the exceptional resource is satisfied; and when the condition for suspending the use of the exceptional resource is satisfied, suspending the use of the exceptional resource, wherein the condition for suspending the use of the exceptional resource is a suspension condition in an RRC idle state.