RLC SDU Retransmission Prioritization for Delay-Critical Data
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Solution Overview
Problem
Existing RLC protocol data unit (PDU) retransmission mechanisms in wireless networks lead to inefficient use of network resources, increased latency, and negative user experience due to unnecessary discarding of PDU sets associated with discard timer expiry, particularly in delay-critical scenarios.
Innovation Solution
Implementing a prioritization mechanism at the transmitting entity that considers delay-criticality and PDU set importance (PSI) to manage retransmissions, using poll retransmit timers and status reporting to expedite the release of delay-critical RLC PDUs from the retransmission buffer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RLC PDU retransmission is performed without prioritization, then all PDUs are retransmitted equally, but network resources are wasted and latency increases due to unnecessary retransmission of non-critical data
Solution Approach 1:
The patent applies local quality by assigning different priorities to different RLC PDUs based on their delay-criticality and PDU set importance (PSI). Instead of uniform retransmission treatment, each PDU is evaluated and handled according to its specific importance level, allowing critical PDUs to be retransmitted while non-critical PDUs are discarded when resources are constrained.
Solution Approach 2:
The patent changes the parameter of retransmission priority by introducing delay-criticality indicators and PSI values. These parameters enable the system to dynamically adjust retransmission behavior based on the urgency and importance of each PDU, transforming the binary retransmission decision into a multi-level priority-based selection process.
2Reliability
If RLC PDU retransmission is performed without prioritization, then all PDUs are retransmitted equally, but latency increases due to lack of expedited handling for critical data
Solution Approach 1:
The patent applies local quality by assigning different priorities to different RLC PDUs based on their delay-criticality and PDU set importance (PSI). Instead of uniform retransmission treatment, each PDU is evaluated and handled according to its specific importance level, allowing critical PDUs to be retransmitted while non-critical PDUs are discarded when resources are constrained.
Solution Approach 2:
The patent applies preliminary action by pre-classifying PDUs into delay-critical and non-delay-critical categories before retransmission. This advance classification allows the system to immediately prioritize critical PDUs when retransmission opportunities arise, eliminating the need for real-time priority assessment and reducing latency for time-sensitive data.
3Device complexity
If discard timer expiry is used to manage retransmission buffer, then buffer management is simplified, but delay-critical PDUs are unnecessarily discarded causing poor user experience
Solution Approach 1:
The patent applies local quality by assigning different priorities to different RLC PDUs based on their delay-criticality and PDU set importance (PSI). Instead of uniform retransmission treatment, each PDU is evaluated and handled according to its specific importance level, allowing critical PDUs to be retransmitted while non-critical PDUs are discarded when resources are constrained.
Solution Approach 2:
The patent applies preliminary action by pre-classifying PDUs into delay-critical and non-delay-critical categories before retransmission. This advance classification allows the system to immediately prioritize critical PDUs when retransmission opportunities arise, eliminating the need for real-time priority assessment and reducing latency for time-sensitive data.
4Speed
If poll retransmit timers are used to expedite PDU release, then critical data delivery is improved, but device complexity increases due to additional timer management
Solution Approach 1:
The patent changes the parameter of retransmission priority by introducing delay-criticality indicators and PSI values. These parameters enable the system to dynamically adjust retransmission behavior based on the urgency and importance of each PDU, transforming the binary retransmission decision into a multi-level priority-based selection process.
Solution Approach 2:
The patent applies preliminary action by pre-classifying PDUs into delay-critical and non-delay-critical categories before retransmission. This advance classification allows the system to immediately prioritize critical PDUs when retransmission opportunities arise, eliminating the need for real-time priority assessment and reducing latency for time-sensitive data.
Data Source
AI summary
The present application relates to devices and components, including apparatus, systems, and methods for retransmission prioritization of RLC SDUs.