Handover QoS Flow-to-RB Mapping Under Complex Signaling
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Solution Overview
Problem
Current 5G network technologies lack an effective scheme for Quality of Service (QoS) management during handover scenarios, leading to complex control logics and performance issues due to heterogeneous access technologies and the absence of bearers in the control plane function entity.
Innovation Solution
A method and device for processing QoS parameters in handover scenarios by transmitting handover request messages with QoS flow-based or RB-based parameters between source and target base stations, enabling admission control and convergence mapping to ensure seamless QoS management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the core network control plane function entity supports various tunneling protocols (GTP, PMIP) for heterogeneous access technology, then the network can support mobility and guarantee QoS, but the control logics and signaling interaction become complex, adversely affecting system performance
Solution Approach 1:
The patent extracts the QoS parameter processing function from the control plane function entity and relocates it to the user plane function entity. This separation removes complex control logics and signaling interactions from the control plane, simplifying the control architecture while maintaining the ability to support heterogeneous access technologies through standardized QoS parameter exchanges at the user plane.
2Adaptability or versatility
If the 5G network separates control function and forwarding function, then the network architecture becomes more flexible and scalable, but complex control logics and signaling interaction are introduced, adversely affecting system performance
Solution Approach 1:
The patent extracts QoS parameter processing from the control plane function entity to the user plane function entity. This extraction eliminates complex control logics and signaling interactions that adversely affect system performance, while the separated architecture maintains flexibility and scalability through standardized interfaces between control and user planes.
Solution Approach 2:
The patent implements preliminary action by pre-configuring QoS parameters and mapping relationships in the user plane function entity before handover occurs. The source base station obtains QoS parameters from the user plane function entity and prepares mapping relationships between QoS flows and radio bearers in advance, enabling faster and more efficient handover execution without complex real-time control interactions.
3Device complexity
If the control plane function entity does not include bearers and uses flow-based QoS parameters, then the architecture is simplified, but the access network must generate RB-based QoS parameters for interaction procedures
Solution Approach 1:
The patent introduces the user plane function entity as an intermediary between the control plane function entity and the access network. The control plane function entity provides flow-based QoS parameters to the user plane function entity, which then generates the corresponding RB-based QoS parameters and mapping relationships. This intermediary simplifies the control plane architecture while automatically handling the QoS parameter generation and mapping complexity at the user plane.
4Reliability
If handover request messages include both QoS flow-based and RB-based parameters, then the target base station can perform comprehensive admission control, but the message complexity and processing overhead increase
Solution Approach 1:
The patent segments the QoS parameter information into distinct components: flow-based QoS parameters from the control plane and RB-based QoS parameters generated by the user plane function entity. The handover request message includes both types of parameters as separate, structured elements with clear mapping relationships, enabling comprehensive admission control while maintaining manageable message structure through standardized formatting and optional inclusion based on network conditions.
Data Source
AI summary
During the handover, a source base station transmits a handover request message carrying a QoS flow-based QoS parameter and/or a RB-based QoS parameter to a target base station. The target base station performs the admission control in accordance with the QoS flow-based QoS parameter or the RB-based QoS parameter, and transmits back to the source base station a handover request response message including information of a QoS flow or RB admitted successfully or unsuccessfully. The target base station performs, in accordance with the received information of the QoS flow, a convergence operation on the QoS flows which have a same QoS requirement, and generates a convergence mapping relationship from the QoS flows to the RBs and a corresponding RB configuration parameter. In addition, the target base station transmits the information of the QoS flow having been admitted to a core network.