RLC Retransmission Priority Handling to Reduce Padding Overhead

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Solution Overview

Problem

Existing wireless communication systems face inefficiencies due to significant padding overhead and increased latency in retransmitting radio link control (RLC) communications, particularly for unacknowledged packets, which can lead to excessive resource utilization and delays.

Innovation Solution

Retransmitting unacknowledged RLC communications based on a lower priority than untransmitted communications, utilizing uplink resources typically allocated for padding, and employing a configured time window or grant-based retransmission to optimize resource use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If unacknowledged RLC communications are retransmitted using conventional priority handling, then communication reliability is improved, but padding overhead increases and resource utilization becomes excessive

Engineering Contradiction:

ImproveRLC communication reliabilityVSAvoidpadding overhead

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent changes the priority parameter of unacknowledged RLC communications from conventional high priority to lower priority status. This parameter change allows the system to differentiate between truly critical communications and those that can wait, thereby reducing padding overhead while maintaining acceptable reliability through grant-based retransmission mechanisms.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If conventional retransmission methods are used for unacknowledged packets, then communication reliability is improved, but latency increases significantly

Engineering Contradiction:

Improvepacket delivery reliabilityVSAvoidretransmission latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent introduces dynamic priority handling where the system can adaptively determine when to retransmit unacknowledged RLC communications. By using grant-based retransmission and configurable time windows, the system dynamically adjusts retransmission timing to minimize latency while ensuring reliability, rather than using fixed conventional retransmission intervals.

Inventive Principle:

Principle #15Dynamics

3Ease of manufacture

If uplink resources are allocated for padding, then resource allocation is simplified, but resource utilization efficiency decreases

Engineering Contradiction:

Improveresource allocation simplicityVSAvoidresource utilization efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent makes uplink resources multi-functional by allowing them to serve both padding purposes and retransmission purposes. Through grant-based retransmission mechanisms, the same resource allocation framework handles both original transmission and retransmission needs, improving resource utilization efficiency without complicating the allocation process.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250317795A1Radio link control communication retransmission

Publication Date: 2025.10.09 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may transmit one or more radio link control (RLC) communications. The wireless communication device may retransmit one or more unacknowledged RLC communications, of the one or more RLC communications, based at least in part on a first priority of the one or more unacknowledged RLC communications that is lower than a second priority of one or more untransmitted communications. Numerous other aspects are described.