PDU Set Congestion Control for Consistent Packet Handling
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Solution Overview
Problem
Existing communication systems fail to control the quality (e.g., jitter, reliability) of protocol data unit (PDU) packets across multiple networks, leading to potential loss of entire PDU sets due to differing handling of individual packets, particularly in XR applications where PDU sets traverse multiple access networks.
Innovation Solution
Implementing a congestion control mechanism that ensures all PDU packets within a set are handled consistently by setting ECN bits based on the status of the first packet, using techniques like DualQ and L4S, to maintain consistent quality and prevent dropping of entire sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If individual PDU packets are handled independently across multiple networks, then network flexibility and routing efficiency are improved, but quality consistency and reliability of PDU sets deteriorate
Solution Approach 1:
The patent applies preliminary action by establishing a unified congestion control policy for the entire PDU set before packets are transmitted across different networks. The first packet's congestion status determination sets the handling state for all subsequent packets in the set, ensuring consistent quality control is prepared in advance. This prevents quality inconsistency that would otherwise occur due to independent packet handling.
Solution Approach 2:
The patent implements universality by creating a unified congestion control mechanism that applies the same handling state to all packets within a PDU set, regardless of which network they traverse. The congestion control policy functions universally across multiple access networks (3GPP and non-3GPP), ensuring that all packets in a set are treated consistently to maintain quality reliability.
2Ease of operation
If congestion control is applied to each PDU packet individually, then packet-level optimization is improved, but overall PDU set quality control deteriorates
Solution Approach 1:
The patent merges the congestion control decisions for all packets in a PDU set into a single unified control mechanism. Instead of making independent congestion control decisions for each packet, the system combines the control logic so that the handling state determined by the first packet applies to all subsequent packets. This merging ensures PDU set quality control while maintaining operational simplicity.
3Adaptability or versatility
If different handling states are applied to different PDU packets in a set, then adaptive network response is improved, but PDU set completeness and reliability deteriorate
Solution Approach 1:
The patent applies local quality by allowing different handling states for different PDU sets based on their specific congestion conditions, while maintaining uniform handling within each set. The congestion control mechanism adapts to local network conditions for each PDU set independently, determining appropriate handling states (such as ECN marking or packet dropping) based on the first packet's congestion status, thereby maintaining both adaptability and set completeness.
Data Source
AI summary
A method of processing a protocol data unit (PDU) set for a data network includes steps of (a) receiving a first PDU packet of the PDU set, (b) receiving, subsequent to reception of the first PDU packet, a second PDU packet of the PDU set, (c) determining, after receiving the first and second PDU packets, a congestion status of the data network for the PDU set, (d) controlling, based on the determined congestion status, a handling state of the second PDU packet to match a handling state of the first PDU packet, and (e) transmitting the first PDU packet and the controlled second PDU packet to a destination receiver of the data network.