Transmitting Device Buffer Control for 5G Latency

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Solution Overview

Problem

In 5G communication systems, data stored in the RLC or PDCP layers often fails to meet latency requirements due to excessive buffering time, leading to head-of-line blocking and delayed transmission of low-latency data.

Innovation Solution

A transmitting device with a first layer processor and a second layer processor that includes a buffer for storing transmission data, where the first layer processor discards data based on parameters from the second layer for transmission control, reducing buffering time and ensuring timely transmission of low-latency data.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If data is stored in the buffer in the RLC or PDCP layer for transmission control, then transmission reliability is improved, but latency increases and low-latency data cannot meet timing requirements

Engineering Contradiction:
Improvetransmission reliabilityVSAvoidlatency
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The patent segments the buffer into multiple independent buffer regions, each associated with different logical channels and having different discard timer settings. This allows low-latency data to be stored in buffer regions with shorter discard timers while high-reliability data can use longer discard timers, thus resolving the contradiction between transmission reliability and latency by applying different buffering strategies to different data types.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent applies different quality characteristics to different parts of the buffer by configuring separate discard timers for different logical channels. Each logical channel can have its own discard timer value tailored to its specific latency requirements, enabling the system to optimize both reliability and latency for different data streams simultaneously within the same buffer structure.

Inventive Principle:
Principle #3Local quality

2Adaptability or versatility

If a longer discard timer is configured in the buffer, then transmission control flexibility is improved, but head-of-line blocking occurs and low-latency data transmission is delayed

Engineering Contradiction:
Improvetransmission control flexibilityVSAvoiddata transmission speed
Core Design Contradiction:
Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent implements dynamic discard timer management where the discard timer for each logical channel can be independently configured and adjusted based on the specific requirements of that logical channel. This dynamic configuration allows the system to maintain flexibility in transmission control while preventing head-of-line blocking by ensuring that low-latency data is not held back by longer timers intended for other data types.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

By segmenting the buffer into multiple regions with different discard timer configurations, the system allows each segment to operate with its own timing characteristics. This segmentation enables the system to maintain overall transmission control flexibility while allowing specific segments to prioritize speed for low-latency applications, thus resolving the contradiction between flexibility and transmission speed.

Inventive Principle:
Principle #1Segmentation

3Device complexity

If multiple logical channels are aggregated into logical channel groups for priority control, then device complexity is reduced, but latency requirements cannot be satisfied for individual channels

Engineering Contradiction:
Improvecontrol complexityVSAvoidlatency
Core Design Contradiction:
Device complexityVSLoss of time

Solution Approach 1:

The patent segments the buffer management at the logical channel level rather than aggregating all channels into single buffer groups. This segmentation allows each logical channel to have its own buffer region and discard timer configuration, maintaining fine-grained control over latency requirements while still providing a structured management framework that does not excessively increase device complexity.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent applies local quality control by allowing each logical channel within a logical channel group to have its own discard timer setting tailored to its specific latency requirements. This approach maintains the complexity-reducing benefit of logical channel grouping while preventing the aggregation from causing latency violations, as each channel can be optimized locally for its timing needs.

Inventive Principle:
Principle #3Local quality

Data Source

PatentUS20240063955A1Transmitting device and buffer control method
Publication Date: 2024.02.22 1FINITY INC
  • US20240063955A1 patent drawing
  • US20240063955A1 patent drawing
  • US20240063955A1 patent drawing

AI summary

A transmitting device includes: a buffer configured to store the transmission data; a first layer processor configured to execute processing for a first layer on the transmission data; a second layer processor configured to execute processing for a second layer on the transmission data, the second layer being lower layer of the first layer; and a transmitter configured to transmit the transmission data processed by the first layer processor and the second layer processor; and a receiver configured to receive first information and second information, the first information being information for setting a first time for discarding the transmission data used by the first layer, the second information being information associated with the second layer and used to configure a second time for discarding the transmission data, wherein the first layer processor is configured to discard the transmission data stored in the buffer when the second discard time expires.