UE Discard Timer for Latency Reduction in Wireless Systems
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing latency, particularly in augmented reality (AR), virtual reality (VR), and mixed reality (MR) applications, where timely data transmission is critical.
Innovation Solution
The proposed solution involves a method where user equipment (UE) initiates a discard timer for protocol data units (PDUs) in its buffer. When the remaining time for the discard timer satisfies a threshold criterion, the UE transmits a delay status report to the base station. This allows the network to allocate resources effectively and prioritize latency-sensitive traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE transmits delay status reports frequently to enable efficient resource allocation, then latency performance is improved, but signaling overhead increases
Solution Approach 1:
The patent changes the parameter of delay status report transmission from frequent/continuous to conditional/triggered based on discard timer values. The UE monitors the discard timer and only transmits delay status reports when the remaining time meets a threshold criterion, thus reducing signaling overhead while still providing timely latency information for resource allocation
Solution Approach 2:
The UE performs preliminary monitoring of the discard timer value before transmitting delay status reports. By checking whether the remaining time satisfies the threshold criterion in advance, the UE prepares transmission only when necessary, avoiding unnecessary signaling while ensuring latency-critical information is reported in time
2Loss of time
If the UE monitors and reports delay status for all PDUs, then latency performance is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the monitoring and reporting behavior based on the discard timer value of each PDU. Instead of uniformly monitoring all PDUs, the UE selectively monitors and reports only those PDUs whose remaining discard timer value satisfies the threshold criterion, reducing processing complexity while focusing resources on latency-critical traffic
Data Source
AI summary
Systems and methods for protocol data unit (PDU) discard may include user equipment (UE) which receives, at a buffer of the UE, a protocol data unit (PDU) for transmission to a base station. The UE may initiate a discard timer responsive to the PDU being received in the buffer. The UE may transmit, to the base station, a delay status report corresponding to the PDU, responsive to a remaining time for the discard timer satisfying a threshold criterion.