QoS Flow Mapping for 5G Handover Continuity
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Solution Overview
Problem
In 5G mobile communication systems, during handover, the target access network device lacks information about the effective mapping relationship between QoS flows and data radio bearers, leading to disruptions in user service continuity due to unclear configuration methods between the network side and user equipment.
Innovation Solution
A QoS flow processing method and device that involves receiving configuration information from a first access network device, including indication of QoS rule reflective characteristics and mapping relationships, to configure and update the mapping between QoS flows and data radio bearers in a second access network device, ensuring service transfer and continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the network side uses reflective QoS characteristic to reduce control signaling by not configuring uplink QoS rules through RRC signaling, then control signaling overhead is reduced, but the target access network device cannot obtain the mapping relationship between QoS flow and DRB during handover, causing service continuity disruption
Solution Approach 1:
The source access network device performs preliminary action by including the mapping relationship between QoS flow and DRB in the handover request message before handover occurs. This ensures that the target access network device has the necessary information to maintain service continuity, resolving the contradiction between reduced control signaling and reliable service continuity.
2Ease of operation
If the network side configures mapping relationship between QoS flow and DRB through RRC signaling, then the mapping relationship is explicitly configured for UE, but during handover the target access network device still cannot obtain this mapping relationship information, leading to inability to update mapping relationship
Solution Approach 1:
The handover request message serves as an intermediary that transfers the mapping relationship information from the source access network device to the target access network device. This intermediary mechanism enables the target device to obtain necessary configuration information during handover, resolving the contradiction between clear configuration and handover adaptability.
3Adaptability or versatility
If the target access network device does not know the mapping relationship between QoS flow and DRB, then configuration flexibility is maintained, but the device cannot update the mapping relationship during handover, disrupting user service continuity
Solution Approach 1:
The source access network device performs preliminary action by including the mapping relationship between QoS flow and DRB in the handover request message before handover occurs. This ensures that the target access network device has the necessary information to maintain service continuity, resolving the contradiction between reduced control signaling and reliable service continuity.
Data Source
AI summary
Embodiments of this application provide a QoS flow processing method and device, and a communications system. A first access network device sends a message used for a service transfer request to a second access network device, and the message used for the service transfer request includes configuration information of a QoS flow in the first access network device, so that the second access network device can configure a mapping relationship from the QoS flow to a DRB of the second access network device for UE based on the configuration information, and accept the QoS flow of the UE. Therefore, in a service transfer process, a reliable QoS service can be provided for a user, and continuity of a user service can be ensured.