SDAP Entity QoS Flow Remapping DRB Transition

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Solution Overview

Problem

In 5G New Radio (NR) systems, QoS flow remapping during RRC connection establishment and handover scenarios often results in data transmission interruptions and packet loss, as existing methods fail to ensure seamless and sequential delivery of data across different Data Radio Bearers (DRBs).

Innovation Solution

The method involves using a Service Data Adaptation Protocol (SDAP) entity to determine the end data packet on a first DRB and complete its transmission before remapping the QoS flow to a second DRB, ensuring that data packets following the end packet are transmitted on the new DRB without interruption, utilizing a device with determination units for identifying the need for remapping and completion of data transmission, and a transmission unit for mapping and caching data packets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If QoS flow remapping is performed during RRC connection establishment or handover, then the QoS flow can be mapped to a more suitable DRB, but data transmission interruption and packet loss occur

Engineering Contradiction:

ImproveQoS flow mapping flexibilityVSAvoiddata transmission continuity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The SDAP entity determines the last data packet of the QoS flow on the first DRB before remapping occurs. This preliminary identification allows the system to complete transmission of all packets on the first DRB before switching to the second DRB, preventing packet loss and ensuring continuous data delivery during the remapping process

Inventive Principle:

Principle #10Preliminary action

2Productivity

If data packets are remapped to a new DRB during transmission, then the QoS flow can utilize the new DRB resources, but packet sequence may be disrupted

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoidpacket delivery sequence

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The SDAP entity identifies the last data packet on the first DRB before remapping. This ensures that all packets up to and including the last packet on the first DRB are transmitted and acknowledged before any packets are sent on the second DRB, maintaining strict sequential order across the DRB transition

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses feedback from the determination of the last data packet to control the remapping timing. The remapping operation is conditioned on completing transmission of identified packets, creating a feedback loop that ensures sequence integrity before allowing the DRB switch

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11252610B2Method and apparatus for remapping QoS flow, and computer storage medium

Publication Date: 2022.02.15 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

A method and a device for remapping a QoS flow, and a non-transitory computer storage medium are provided. The method comprises operations as follow. After a first device determines that a first QoS flow needs to be remapped from a first DRB to a second DRB, an SDAP entity of the first device determines a first data packet, the first data packet being the end data packet transmitted on the first DRB in the first QoS flow. After the SDAP entity of the first device determines that transmission of the first data packet in the QoS flow is completed on the first DRB, the first QoS flow is mapped to the second DRB, and data packets following the first data packet in the first QoS flow is transmitted on the second DRB.