Dynamic UE MTU Configuration via Network Entity Directive
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Solution Overview
Problem
In packet-switched networks, differences in maximum transmission unit (MTU) settings between transmitting nodes and intermediary nodes can lead to packet fragmentation, causing burdens on the network and issues with reassembly, especially when manufacturers do not share MTU information and in scenarios where mobile devices operate on varying networks with different MTUs.
Innovation Solution
A method and system where a network entity detects a threshold number of packets exceeding its MTU and sends a directive to the transmitting node, such as a UE, to decrease its MTU by including a directive in a packet header carrying bearer data, thereby reducing the maximum packet size for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmitting node uses a larger MTU to transmit packets, then transmission efficiency is improved, but packet fragmentation occurs at intermediary nodes with smaller MTU
Solution Approach 1:
The intermediary node monitors incoming packets and detects when packets exceed its MTU. It then sends feedback to the transmitting node instructing it to adjust its MTU setting. This closed-loop feedback mechanism allows the transmitting node to adapt its transmission parameters based on actual network conditions, preventing fragmentation while maintaining optimal transmission efficiency.
Solution Approach 2:
The transmitting node dynamically changes its MTU parameter based on instructions received from the intermediary node. Instead of using a fixed MTU setting, the node adjusts the maximum transmission unit size to match the capabilities of intermediary nodes in the network path, thereby eliminating packet fragmentation while preserving transmission efficiency.
2Adaptability or versatility
If the intermediary node fragments packets exceeding its MTU, then packet transmission continues, but network burden increases and reassembly issues arise
Solution Approach 1:
The transmitting node performs preliminary action by adjusting its MTU setting before transmitting packets, based on advance information about the intermediary node's MTU capability. This prevents the creation of oversized packets that would require fragmentation, thereby eliminating the need for complex fragment reassembly operations at the intermediary node and reducing overall network burden.
3Ease of manufacture
If manufacturers do not share MTU information, then device compatibility is maintained, but MTU mismatches occur between transmitting and intermediary nodes
Solution Approach 1:
The intermediary node autonomously determines its own MTU capability and communicates this information to the transmitting node without requiring pre-shared configuration data from manufacturers. The transmitting node then self-adjusts its MTU setting based on this information, enabling reliable MTU matching while maintaining manufacturing independence and device compatibility.
Data Source
AI summary
When a network entity receives packets transmitted from a user equipment device (UE), the network entity will detect that a threshold number of those packets exceed the network entity's maximum transmission unit (MTU), and the network entity will responsively cause the UE to reduce the UE's MTU. In particular, the network entity will responsively transmit to the UE, within a header of a packet carrying bearer data to the UE, a directive for the UE to decrease the UE's MTU.