RLC Acknowledgement Mode Timer for Multi-Modal Traffic Latency
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving both low latency and high reliability, particularly in multi-modal traffic scenarios such as extended reality (XR) deployments, where stringent latency and reliability thresholds are required for both visual and haptic data.
Innovation Solution
The implementation of a timer mechanism in wireless communication devices, where a first timer defines the duration for requesting and monitoring missing packet data units, and a second timer sets the time for requesting retransmissions, allowing the system to balance latency and reliability by limiting indefinite retransmission requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver continues to request retransmission of missing PDUs indefinitely, then reliability is improved, but latency increases
Solution Approach 1:
The patent applies preliminary action by setting a timer threshold before indefinite retransmission occurs. The timer is initialized when a missing PDU is detected, and before the retransmission request can continue indefinitely, the timer expires after a predetermined duration. This preliminary timing mechanism prevents unlimited waiting while maintaining reasonable retransmission attempts, thus resolving the contradiction between reliability and latency.
Solution Approach 2:
The patent changes the parameter of retransmission duration from indefinite to time-limited by introducing a timer threshold. This parameter change transforms the retransmission behavior from continuous (indefinite) to bounded (time-limited), allowing the system to balance reliability through controlled retransmission attempts while preventing excessive latency through the imposed time constraint.
2Reliability
If the receiver sends multiple retransmission requests before timer expiration, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback through the timer mechanism that monitors and limits the retransmission request process. The timer provides continuous feedback on the elapsed time since the missing PDU was detected, automatically stopping retransmission requests when the threshold is reached. This feedback loop simplifies device complexity by providing a clear, automated control mechanism rather than requiring complex decision logic for determining when to stop requesting retransmission.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A network may configure one or more devices with a timer. The timer may define a threshold amount of time a receiver in a radio link control (RLC) acknowledgement mode (AM) is to wait for and continue to request retransmission of a missing RLC packet data unit (PDU) through automatic repeat request (ARQ) mechanisms. The receiver may detect a missing PDU, and may initiate two timers: a first timer defining how long the receiver is to request and monitor for the missing first PDU, and a second timer defining an amount of time before requesting retransmission of the first PDU. Upon expiration of the second timer, the receiver may transmit a request for retransmission of the first PDU. Upon expiration of the first timer, the receiver may forward all other sequentially received PDUs to higher layers for decoding.