Downlink Packet Arrival Alignment for Scheduling Window Delays
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Solution Overview
Problem
In communication systems, scheduling delays at access network elements can introduce end-to-end delays in downlink service packets, failing to meet guaranteed delay requirements due to scheduling windows and processing delays.
Innovation Solution
A downlink transmission method involving session management network elements adjusting time to align packet arrival with scheduling windows, allowing for efficient processing and reducing waiting delays by buffering and prioritizing packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If downlink service packets are scheduled according to access network element scheduling windows, then scheduling order is maintained, but scheduling delay increases causing end-to-end delay requirements to fail
Solution Approach 1:
The patent applies preliminary action by having the application server or user plane network element adjust the sending moment of downlink service packets in advance based on time adjustment information. This allows packets to arrive at the access network element within the expected scheduling window, preventing scheduling delays before they occur rather than reacting to them afterward.
Solution Approach 2:
The patent implements feedback through the session management network element calculating time adjustment information based on the difference between expected and estimated arrival moments. This feedback mechanism allows the system to dynamically adjust packet sending times to compensate for network variations and ensure packets arrive within scheduling windows, maintaining end-to-end delay guarantees.
2Productivity
If downlink service packets are buffered and processing is prioritized, then processing efficiency improves, but resource utilization may be affected
Solution Approach 1:
The patent applies preliminary action by having packets buffered in advance at the application server or user plane network element with adjusted sending moments calculated beforehand. This allows the access network element to process packets efficiently when they arrive within expected time windows, improving processing efficiency while managing resource usage through proactive scheduling.
Data Source
AI summary
This application provides an apparatus configured to obtain duration, namely, a first delay, between an expected moment at which a downlink service packet arrives at an access network element and an estimated moment at which the downlink service packet arrives at the access network element, the expected moment is within a first scheduling window, and a next scheduling window adjacent to the first scheduling window is a downlink scheduling window. The session management network element is further configured to send the first delay to an application network element, where the first delay is used by the application network element to determine a second moment at which the downlink service packet is sent, and a moment at which the downlink service packet sent at the second moment arrives at the access network element is within the first scheduling window.