Retransmission Buffer Memory Management in Wireless UEs

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Solution Overview

Problem

Wireless communication systems face challenges in providing satisfactory memory management techniques, leading to inadequate support for high reliability and low latency communications, especially as demand for communication efficiency increases.

Innovation Solution

Configuring communication devices to store data transmissions in a retransmission buffer and transmit feedback requests based on a system memory utilization threshold, allowing for efficient memory utilization and recovery mechanisms to ensure high reliability and low latency operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If data transmissions are stored in a retransmission buffer to support high reliability and low latency communications, then communication reliability is improved, but system memory utilization increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidsystem memory utilization

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent implements dynamic memory management by adjusting the retransmission buffer size based on real-time system memory availability. The buffer size is dynamically scaled up or down according to memory utilization thresholds, allowing the system to maintain high reliability when memory is available while reducing memory consumption when memory is constrained, thus resolving the contradiction between reliability and memory utilization.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of retransmission buffer size dynamically based on system memory utilization thresholds. When memory utilization exceeds a threshold, the buffer size is reduced; when memory is available, the buffer size is increased. This parameter adjustment allows the system to balance between maintaining communication reliability and reducing memory consumption, directly addressing the technical contradiction.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If a preconfigured window size is used for the retransmission buffer, then memory allocation is simplified, but the system cannot adapt to varying memory availability and communication efficiency demands

Engineering Contradiction:

Improvememory allocation simplicityVSAvoidmemory availability adaptation

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent transitions from a static preconfigured window size to a dynamic buffer size that adapts to real-time system conditions. The buffer size is adjusted based on memory availability and communication efficiency requirements, enabling the system to adapt to varying operational conditions while maintaining ease of implementation through automated threshold-based control.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements a feedback mechanism where system memory utilization is continuously monitored and fed back to control the retransmission buffer size. When memory utilization exceeds a threshold, the buffer size is reduced; when memory is available, the buffer size is increased. This feedback loop enables adaptive memory management that responds to real-time system conditions, resolving the contradiction between allocation simplicity and adaptability.

Inventive Principle:

Principle #23Feedback

3Productivity

If feedback requests are transmitted in subsequent data transmissions, then memory flow management is improved, but additional transmission overhead is introduced

Engineering Contradiction:

Improvememory flow management efficiencyVSAvoidtransmission overhead

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent merges the feedback request transmission with the subsequent data transmission, combining two functions into a single transmission event. The feedback request is included in the same transmission window as the data transmission, eliminating the need for separate feedback transmission cycles and reducing overall transmission overhead while maintaining effective memory flow management.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent performs preliminary actions by preparing feedback requests in advance within the data transmission structure, so that feedback can be sent simultaneously with the next data transmission rather than requiring additional time for separate feedback cycles. This preliminary preparation reduces transmission overhead while maintaining memory flow management efficiency.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12075381B2System memory flow management

Publication Date: 2024.08.27 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A communication device, otherwise known as a user equipment (UE) may transmit a data transmission to a receiver. In some examples, the data transmission may be a radio link control (RLC) protocol data unit (PDU) transmission. The UE may store the data transmission in a retransmission buffer, and transmit a feedback request to the receiver in a subsequent data transmission based on a system memory utilization threshold for the retransmission buffer being satisfied due to storage of the data transmission.