Network Device Failure Notifications for Low-Delay Retransmission
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Solution Overview
Problem
Data transmission failures in 3GPP networks are characterized by high feedback delays and low data transmission efficiency due to application layer or transport layer feedback mechanisms.
Innovation Solution
Implementing a communication method where network devices, such as session management, policy control, access, and user plane elements, notify the application server directly about data transmission failures, reducing feedback delays and improving efficiency by determining appropriate retransmission durations based on delay information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If application layer or transport layer feedback mechanism is used for data transmission status, then the terminal device can feed back data receiving status, but the feedback delay is high and data transmission efficiency is low
Solution Approach 1:
The patent introduces network devices (session management network device, access network device, user plane network device) as intermediaries between the terminal device and application server. These network devices actively monitor data transmission status and send notifications to the application server when transmission failures occur, eliminating the need for the terminal device to initiate feedback. This intermediary mechanism significantly reduces feedback delay and improves data transmission efficiency.
Solution Approach 2:
The patent implements an active feedback mechanism where network devices continuously monitor data transmission status and provide real-time feedback to the application server. When transmission failures are detected, the network devices immediately notify the application server, enabling rapid response and retransmission. This feedback loop operates independently of the terminal device's feedback mechanism, achieving lower latency and higher efficiency.
2Reliability
If the terminal device feeds back data receiving status within specific time, then the application server can determine retransmission needs, but the feedback mechanism causes high delay and low efficiency
Solution Approach 1:
The patent implements preliminary action by having network devices proactively monitor and detect data transmission failures before the terminal device can provide feedback. The session management network device, access network device, and user plane network device continuously check transmission status and immediately notify the application server when failures occur, enabling the application server to initiate retransmission before the terminal device's feedback would allow. This preliminary detection and notification mechanism significantly reduces retransmission delay while maintaining reliability.
3Ease of operation
If application server waits for terminal device feedback to sense transmission failure, then the feedback mechanism is simple, but the application server cannot quickly sense and respond to failures
Solution Approach 1:
The patent introduces network devices as intermediaries that actively monitor data transmission status and serve as messengers between the terminal device and application server. These intermediaries continuously check transmission status and immediately notify the application server of any failures, eliminating the need for the application server to wait for terminal device feedback. This intermediary approach maintains operational simplicity while dramatically increasing failure sensing speed.
Solution Approach 2:
The patent implements an active feedback mechanism where network devices continuously monitor transmission status and provide real-time feedback to the application server. When transmission failures are detected, the network devices immediately notify the application server, enabling rapid response. This feedback loop operates independently of the terminal device's feedback mechanism, achieving both simplicity and high speed in failure detection.
Data Source
AI summary
This application provides a communication method and an apparatus. The method includes: A first network device in a first network receives a first policy from a second network device in the first network, where the first policy indicates the first network to notify the application server in a case that the application server fails to transmit data to the terminal device through the first network. Then, the first network device sends a first message to a third network device in the first network, where the first message indicates the third network device to notify the first network device or a fourth network device in the first network in a case that the third network device fails to transmit data to the terminal device, and the first message is generated according to the first policy.