5G DRB Switching Packet Handling for QoS Continuity
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Solution Overview
Problem
The existing communication systems face challenges in reducing layer 2 overhead, ensuring service continuity, and guaranteeing Quality of Service (QoS) during handovers between different systems, particularly in 5G and LTE networks, due to packet out-of-order and loss issues caused by changes in data radio bearer (DRB) mapping rules.
Innovation Solution
A method is proposed that involves determining whether a QoS flow mapping is switched from a first DRB to a second DRB, transmitting information about the last packet on the first DRB, starting a timer for packet transmission on the second DRB, and handling re-transmission requests, to ensure in-order packet transmission and QoS continuity during handovers by using a packet processing method that includes a transceiver and controller for managing DRB switches in wireless communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If QoS flow mapping is switched from first DRB to second DRB during handover, then service continuity and adaptability are improved, but packet out-of-order and packet loss occur due to mapping rule changes
Solution Approach 1:
The transmitter stores information about the last packet transmitted on the first DRB before the mapping switch occurs. This preliminary action ensures that when packets are retransmitted or acknowledged on the second DRB, the receiver can correctly reorder them using the stored sequence information, preventing packet out-of-order delivery during handover.
Solution Approach 2:
The patent introduces an intermediary mechanism where the transmitter maintains and transmits metadata about the last packet's sequence number and timing information. This intermediary information acts as a bridge between the old and new DRB mappings, allowing the receiver to reconstruct the correct packet order despite the mapping rule change.
2Productivity
If layer 2 overhead is reduced by optimizing packet processing, then transmission efficiency is improved, but complexity increases due to timer management and re-transmission handling
Solution Approach 1:
The packet processing function is segmented into distinct modules: one for normal packet transmission, another for timer management, and a third for re-transmission handling. This segmentation allows each module to be optimized independently, reducing overall system complexity while maintaining high transmission efficiency through specialized processing paths.
Solution Approach 2:
The patent implements periodic timer checks and structured re-transmission intervals. Instead of continuous complex processing, the system uses periodic actions to manage packet state, reducing computational overhead while ensuring reliable delivery. The timer-based approach simplifies the control logic compared to continuous monitoring mechanisms.
Data Source
AI summary
A system and communication method for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT), and for application to intelligent services based on the 5G communication and the IoT-related technologies, 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 the present disclosure 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.