Local Link Congestion Control via Dedicated Identifier
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Solution Overview
Problem
Existing end-to-end congestion notification mechanisms in wireless communication networks are ineffective in addressing local link congestion, as they rely on network nodes and remote terminals that may not support the ECN mechanism, leading to failure in congestion notification and control.
Innovation Solution
A method where a local link control entity negotiates and sets a congestion identifier in downlink data packets with local terminals to perform congestion control independently, freeing the mechanism from dependence on network nodes or remote terminals, allowing for effective local congestion notification and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an end-to-end ECN mechanism is used for congestion notification, then congestion control can be implemented across the entire network path, but the mechanism fails when network nodes or remote terminals do not support ECN, causing the ECN flag to be discarded or the whole IP packet to be discarded
Solution Approach 1:
The patent segments the congestion control mechanism into two independent parts: local link congestion control between the local terminal and local link control entity, and end-to-end congestion control through the core network. The local part uses a local congestion notification mechanism that operates independently of ECN support in remote terminals or core network nodes, thereby resolving the contradiction between reliability and adaptability
Solution Approach 2:
The patent introduces a local link control entity as an intermediary that mediates between the local terminal and the remote terminal. This intermediary performs local congestion control and notification without requiring ECN support from the remote terminal or core network nodes, enabling reliable congestion control even when ECN is not supported end-to-end
2Reliability
If ECN support is required from both network nodes and remote terminals for congestion notification to work, then end-to-end congestion control can be achieved, but the mechanism becomes dependent on multiple components and fails if any single component lacks support
Solution Approach 1:
The patent divides the congestion control system into independent segments: the local link segment between the terminal and local link control entity, and the remote segment involving the core network and remote terminal. The local segment implements congestion control independently without requiring ECN support from the remote segment, thereby reducing device complexity dependencies while maintaining reliability
Solution Approach 2:
The local terminal and local link control entity perform self-service congestion control on the local link without requiring assistance from ECN-capable remote terminals or core network nodes. The local congestion notification mechanism is self-contained and does not depend on external ECN support, reducing the number of components that must support the mechanism
Data Source
AI summary
The present invention relates to the field of congestion control, and discloses a method for handling local link congestion and an apparatus. The method includes: negotiating, by a local link control entity, a local congestion notification capability with a local terminal; setting, by the local link control entity, a congestion identifier in a downlink data packet corresponding to the local congestion notification capability when a local link is congested between the local link control entity and the local terminal; and performing, by the local link control entity, congestion control on the local link, or performing, by the local terminal, congestion control on the local link according to the congestion identifier. The apparatus includes a local link control entity and a terminal device.