Semi-Persistent Scheduling Configuration Using LSTM Jitter Prediction

Solution Overview

Problem

In wireless communication systems, semi-persistent scheduling (SPS) configurations face challenges due to significant jitter delays in data packet transmission caused by uncertainties in core network link conditions, leading to misalignment of data arrival slots with configured SPS periods, resulting in increased transmission delays that cannot meet low delay demands, especially in scenarios like mixed reality where data streams are generated periodically.

Innovation Solution

The proposed solution employs a Long Short-Term Memory (LSTM) network and Bayesian LSTM network to predict the jitter delay interval of data packets, allowing for dynamic adjustment of SPS periods to align data transceiving resources with predicted arrival times, thereby reducing transmission delays and improving resource allocation efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional SPS configuration is used with fixed time slots, then resource allocation is simple and stable, but data packet arrival misalignment occurs due to jitter delays, resulting in increased transmission delays

Engineering Contradiction:

Improvedata packet transmission reliabilityVSAvoidtransmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies dynamics by transitioning from fixed SPS time slot configuration to dynamic time slot adjustment based on predicted data packet arrival times. The system continuously updates the receiving time units according to predicted jitter delays, making the scheduling flexible and adaptive to actual transmission conditions, thereby resolving the contradiction between stability and delay alignment.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent employs preliminary action by predicting data packet arrival times before actual reception. The terminal device predicts jitter delays and determines appropriate receiving time units in advance, allowing the system to proactively adjust SPS configuration to match expected packet arrivals, thus preventing delay accumulation rather than reacting to it.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If SPS period is fixed, then configuration is simple and stable, but it cannot adapt to jitter delays in core network transmission

Engineering Contradiction:

Improveadaptability to jitter delayVSAvoidSPS configuration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements feedback by using predicted data packet arrival information to continuously adjust SPS receiving time units. The system monitors actual transmission conditions, predicts jitter delays, and feeds this information back to modify the SPS configuration, creating a closed-loop adaptive system that balances adaptability with manageable complexity through intelligent prediction rather than exhaustive adjustment.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies parameter changes by dynamically modifying the SPS receiving time unit parameters based on predicted jitter delays. Instead of changing the entire SPS structure, the system adjusts specific time parameter values (receiving time units) according to prediction results, achieving adaptability through targeted parameter optimization rather than complete reconfiguration.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If data packets are received in next SPS period due to misalignment, then resource allocation remains stable, but significant delay occurs that cannot meet low delay demands

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoidpacket arrival delay

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent employs preliminary action by predicting data packet arrival times before actual reception. The terminal device predicts jitter delays and determines appropriate receiving time units in advance, allowing the system to proactively adjust SPS configuration to match expected packet arrivals, thus preventing delay accumulation rather than reacting to it.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies dynamics by transitioning from fixed SPS time slot configuration to dynamic time slot adjustment based on predicted data packet arrival times. The system continuously updates the receiving time units according to predicted jitter delays, making the scheduling flexible and adaptive to actual transmission conditions, thereby resolving the contradiction between stability and delay alignment.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250008502A1Semi-persistent scheduling configuration method and apparatus and storage medium

Publication Date: 2025.01.02 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

A method, apparatus, and storage medium for semi-persistent scheduling (SPS) configuration. The SPS configuration method performed by a terminal, and the method includes: determining a predicted delay time of arrival of a data packet within at least one SPS period, and determining a time unit corresponding to the predicted delay time; and configuring the time unit to be a time unit receiving the data packet.