PDU Packet Header Simplification for Lower LTE Overhead

Solution Overview

Problem

The overheads consumed by the packet header of protocol data unit (PDU) packets in LTE are large due to the inclusion of framing indication (FI) and resegmentation flag (RF) fields, which are not efficiently optimized.

Innovation Solution

The method and device generate PDU packets with a header that omits the FI and RF fields and includes alternative fields of shorter length, such as a sequence number (SN), last segment flag (LSF), and segmentation offset (SO) fields, or additional fields like a segmentation indication (SI) field, to reduce header size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the packet header includes FI field and RF field to provide complete control functionality, then the control capability is improved, but the header overhead increases

Engineering Contradiction:

Improvecontrol capabilityVSAvoidheader overhead

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent extracts and removes the FI field and RF field from the packet header structure. By taking out these specific fields that contribute to overhead, the invention reduces header size while maintaining essential control functionality through alternative mechanisms.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention changes the parameter configuration of the packet header by modifying which fields are present and their lengths. Specifically, it adjusts the header structure to omit certain fields and adjust others, transforming the header from a fixed comprehensive structure to a optimized structure with reduced overhead.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the packet header includes all standard fields (FI, RF, SN, LSF, SO, etc.) to ensure complete packet control, then the packet functionality is improved, but the header length increases

Engineering Contradiction:

Improvepacket functionalityVSAvoidheader length

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The patent extracts and removes the FI field and RF field from the packet header structure. By taking out these specific fields that contribute to overhead, the invention reduces header size while maintaining essential control functionality through alternative mechanisms.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention changes the parameter configuration of the packet header by modifying which fields are present and their lengths. Specifically, it adjusts the header structure to omit certain fields and adjust others, transforming the header from a fixed comprehensive structure to a optimized structure with reduced overhead.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4221312B1Method and device for generating protocol data unit (PDU) packet

Publication Date: 2025.12.31 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

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Figure 3A~3B
Figure 3C~3D

AI summary

The present disclosure relates to a method and device for generating protocol data unit (PDU) packet. The method comprises acquiring a service data unit (SDU) packet, processing the SDU packet according to a size of a preset data packet, and generating a packet header and a data section of a PDU packet according to the processing result, the packet header and the data section constituting the PDU packet. The packet header omits a framing indication (FI) field and a resegmentation flag (RF) field but comprises a preset field, and the preset field comprises other fields except the FI field and the RF field that are redefined in a common packet header, or a target field that is newly added, the field length of the target field that is newly added being smaller than the total length of the FI field and the RF field.