5G DRB QoS Flow Mapping for Packet Reordering
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Solution Overview
Problem
Current communication systems face challenges in reducing layer 2 overhead, ensuring service continuity, and maintaining quality of service (QoS) during handovers between different network systems, particularly in 5G and LTE networks, due to issues like packet out-of-order and loss caused by changes in data radio bearer (DRB) mapping rules.
Innovation Solution
The proposed solution involves a method for managing quality of service (QoS) flow mapping between data radio bearers (DRBs) in wireless communication systems, where a transmitting device determines whether a QoS flow is switched from one DRB to another and transmits relevant information to the receiving device, including last packets and timer-based packet transmission, to ensure in-order delivery and reduce overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If QoS flow mapping is changed between DRBs to support various QoS services, then service versatility is improved, but packet out-of-order and packet loss occur
Solution Approach 1:
The transmitter stores information about the last packet transmitted on the first DRB before switching to the second DRB. This preliminary action ensures that when mapping changes occur, the receiver can use the stored sequence number information to properly reorder packets and maintain reliable delivery despite the DRB switch.
2Productivity
If layer 2 overhead is reduced to improve transmission efficiency, then productivity is improved, but TCP ACK transmission efficiency deteriorates
Solution Approach 1:
The patent combines multiple TCP ACK packets into a single layer 2 packet for transmission. This merging approach reduces the number of layer 2 overhead structures needed while still delivering multiple ACKs reliably. The receiver can extract and process individual ACKs from the combined packet, maintaining TCP protocol functionality while improving transmission efficiency.
3Loss of time
If radio channel occupancy time is reduced for ACK transmission, then loss of time is reduced, but packet loss risk increases
Solution Approach 1:
Multiple TCP ACK packets are merged into a single layer 2 packet, reducing the number of separate transmissions needed. This decreases radio channel occupancy time while maintaining reliable delivery through the sequence number tracking mechanism that ensures proper reordering and acknowledgment at the receiver.
4Adaptability or versatility
If DRB mapping rules are changed during handover to guarantee QoS, then adaptability is improved, but device complexity increases
Solution Approach 1:
The system implements feedback mechanisms where the transmitter tracks and stores sequence number information from the last packet on each DRB. This feedback approach allows the system to automatically handle mapping changes during handover without complex manual configuration, reducing device complexity while maintaining QoS guarantees through the sequence number-based reordering at the receiver.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method for processing a packet by a transmission device in a wireless communication system according to an embodiment of the present invention comprises the steps of: checking whether a data radio bearer (DRB) mapped to a quality of service (QoS) flow changes from a first DRB to a second DRB; and when the DRB changes from the first DRB to the second DRB, transmitting, to a reception device, information on a last packet transmitted through the first DRB in the QoS flow.