Gateway Recalculates PDU Set Size for IP Fragmentation
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Solution Overview
Problem
IP fragmentation during network transmission can change the number of PDUs in a PDU set, leading to inaccurate PDU set size values (PSSize) due to differences in maximum transmission unit (MTU) sizes and IP address types across network devices.
Innovation Solution
A method where a user equipment (UE) device determines the IP address type and MTU size of a source device and signals this information to a gateway device, which then recalculates the PSSize value to ensure accurate packet delivery of a PDU set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If IP fragmentation occurs during network transmission due to different MTU sizes and IP address types, then network compatibility and adaptability are improved, but the accuracy of PDU set size values deteriorates
Solution Approach 1:
The gateway device performs preliminary actions by determining the IP address type and MTU size of the source device before packet transmission, and pre-calculates the adjusted PDU set size value based on these parameters. This allows the gateway to prepare the correct size information in advance, preventing accuracy loss due to IP fragmentation during transmission.
Solution Approach 2:
The gateway device changes parameters by adjusting the PDU set size value based on the source device's IP address type (IPv4/IPv6) and MTU size. The gateway calculates different adjusted size values depending on these parameters, ensuring the size information remains accurate despite variations in network configuration and potential IP fragmentation.
2Measurement precision
If the gateway device recalculates PSSize values for all PDU sets, then measurement precision of packet delivery is improved, but device complexity and processing overhead increase
Solution Approach 1:
The gateway device applies local quality by performing precise PDU set size value adjustments only for packets originating from specific source devices with known IP address types and MTU sizes. Rather than uniformly processing all packets with the same complexity, the gateway tailors its processing to the specific characteristics of each source device, reducing unnecessary processing overhead while maintaining accuracy for affected traffic.
3Adaptability or versatility
If different devices have different MTU sizes in the network, then network versatility and routing flexibility are improved, but reliability of simultaneous packet arrival deteriorates
Solution Approach 1:
The system implements feedback by having the gateway device determine and use the source device's IP address type and MTU size information to calculate adjusted PDU set size values. This feedback mechanism allows the network to compensate for MTU size variations and IP fragmentation effects, ensuring that packets are delivered with accurate size information that maintains reliability for simultaneous arrival despite routing flexibility and different MTU sizes in the network.
Data Source
AI summary
An example user equipment (UE) device for exchanging media data via a network includes a memory configured to store media data; and a processing system comprising one or more processors implemented in circuitry, the processing system being configured to: receive data from a second network device via a radio access network (RAN), the data from the second network device including a local Internet protocol (IP) address type for the second network device and a maximum transmission unit (MTU) size for the second network device; establish a media communication session with the second network device; send data representing the local IP address type and the MTU size for the second network device to a gateway device associated with the RAN; and receive packets of a protocol data unit (PDU) set of the media communication session originating from the second network device via the RAN.