RLC Poll Triggering for Delay-Critical Data Delivery
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Solution Overview
Problem
Existing communication protocols in radio link control (RLC) acknowledgment mode (AM) face inefficiencies due to unnecessary discarding of PDCP SDUs, leading to resource waste, increased latency, and negative user experience, particularly in scenarios where PDU sets are delay-critical.
Innovation Solution
Implementing a mechanism for the transmitting entity to poll its peer receiving entity for status reports on delay-critical RLC PDUs, triggered by specific conditions, to expedite transmission and retransmission of buffered data, thereby preventing buffer stalling and ensuring timely delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the transmitting entity discards PDCP SDUs based on timer expiry without checking delay-critical status, then the protocol operation is simplified, but unnecessary discarding occurs leading to resource waste and increased latency
Solution Approach 1:
The patent applies preliminary action by checking whether PDCP SDUs are delay-critical before discarding them. The transmitting entity evaluates the delay-critical status of PDCP SDUs prior to timer-based discarding, preventing unnecessary discarding of delay-critical data while maintaining simplified protocol operation for non-delay-critical data.
2Reliability
If the transmitting entity waits for status reports before retransmitting buffered data, then acknowledgment reliability is improved, but transmission time increases due to buffer stalling
Solution Approach 1:
The patent implements feedback by having the receiving entity send status reports to the transmitting entity about received PDCP PDUs. This feedback mechanism allows the transmitting entity to know which data has been successfully received and which needs retransmission, enabling reliable acknowledgment while optimizing transmission time through informed retransmission decisions.
Solution Approach 2:
The patent applies preliminary action by triggering polls to request status reports proactively before buffer stalling occurs. The transmitting entity initiates status report requests when conditions indicate potential buffer stalling, ensuring acknowledgment reliability is maintained while minimizing transmission time delays.
3Loss of time
If the transmitting entity sends frequent status report requests, then acknowledgment timeliness is improved, but network overhead increases
Solution Approach 1:
The patent applies dynamics by making the status report request frequency adaptive rather than fixed. The transmitting entity dynamically adjusts poll triggering based on current transmission conditions, such as buffer status and timing information, to optimize acknowledgment timeliness while minimizing network overhead through conditional polling.
Solution Approach 2:
The patent implements preliminary action by triggering polls proactively when conditions indicate potential buffer stalling or delay-critical data presence. This selective preliminary polling ensures timely acknowledgments for critical data while avoiding unnecessary overhead from frequent status requests for non-critical data.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods for RLC poll triggering.