UE Flow Control for Extended Reality Interaction Delay Reduction
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Solution Overview
Problem
Wireless communication systems experience user interaction delays due to increased latency when user equipment (UE) buffers grow, degrading the user experience, particularly in extended reality applications.
Innovation Solution
The UE implements a flow control layer to manage packet generation rates based on buffer thresholds, adjusting the rate of packet transmission when the buffer exceeds or falls below predefined thresholds, and indicates to the application layer to suspend or resume packet generation accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE increases buffer size to handle packet transmission, then packet transmission reliability is improved, but user interaction delay increases
Solution Approach 1:
The patent implements dynamic flow control by making the buffer size adaptive rather than static. The flow control layer dynamically adjusts the packet generation rate based on real-time buffer conditions, switching between different transmission modes (rate reduction when buffer is full, normal operation when buffer has space). This dynamic adaptation resolves the contradiction by allowing the system to maintain reliability through buffer usage while minimizing delay through responsive rate adjustment.
Solution Approach 2:
The patent establishes a feedback mechanism where the flow control layer continuously monitors buffer status and provides feedback to the application layer. When the buffer reaches a threshold level, the flow control layer sends feedback indicating that packet generation should be reduced or suspended. This feedback loop enables the system to maintain reliability by utilizing buffer capacity while preventing excessive delay by及时调整 transmission rates based on current buffer conditions.
2Productivity
If the UE transmits packets at a high rate, then productivity is improved, but buffer overflow risk increases causing delays
Solution Approach 1:
The patent applies preliminary action by proactively monitoring buffer status before overflow occurs. The flow control layer checks buffer conditions in advance and adjusts the packet generation rate preemptively when the buffer approaches its capacity threshold. This prevents buffer overflow delays by taking action before the harmful condition (overflow) occurs, while still maintaining high productivity by only reducing rates when necessary.
3Loss of time
If the UE implements flow control monitoring, then user interaction delay is reduced, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling the flow control layer to autonomously monitor its own buffer status and make decisions about packet generation rates without requiring complex external control mechanisms. The system serves itself by using internal buffer status information to automatically adjust transmission rates, reducing user interaction delay while avoiding the complexity of external flow control systems.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. For instance, a flow control layer of a UE may provide a capability message to an application layer including an indication that the UE supports a service for providing flow control information for support of extended reality traffic and may receive a message from an application of the application layer registering a flow associated with the application with the service. The flow control layer may provide, to the application via the service, an indication that a quantity of packets or bytes in a buffer of the flow control layer fails to satisfy a threshold. The UE may obtain, from the application, a packet associated with the flow based on providing the indication that the quantity of packets or bytes in the buffer fails to satisfy the threshold and may transmit, to a network entity, a message including the obtained packet.