5G Secondary Node Data Forwarding for Handover Accuracy
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Solution Overview
Problem
In a 5G dual connectivity scenario, when a master node triggers a handover or secondary node change, the source node cannot correctly obtain the mapping relationship between QoS flows and DRBs terminated in the secondary node, nor can it identify data flows that need data forwarding, leading to incorrect forwarding requests in handover or addition messages.
Innovation Solution
A method and device for data forwarding where the secondary node receives an interface message from the master node, sends data forwarding suggestions, and ensures correct data forwarding during node switching or secondary node changes by providing necessary forwarding information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source node uses existing XnAP interface IEs for handover or node change, then the basic handover function is maintained, but the mapping relationship between QoS flows and DRBs terminated in the secondary node cannot be obtained, and data forwarding information is lost
Solution Approach 1:
The patent applies preliminary action by having the source secondary node pre-obtain and include data forwarding information (QoS flow to DRB mapping relationships) in the response message to the modification request, before the actual handover or node change occurs. This ensures that the target node receives complete forwarding information in advance, enabling accurate data forwarding without information loss.
Solution Approach 2:
The patent introduces an intermediary mechanism where the source secondary node acts as a mediator between the source master node and the target node. The source secondary node intercepts the modification request, retrieves the necessary data forwarding information, and embeds it in the response message, thereby bridging the information gap that would otherwise exist in the standard XnAP interface.
2Productivity
If the source master node sends handover request or addition request using standard procedures, then the node change process is completed, but forwarding requests cannot be correctly filled in due to lack of data forwarding information
Solution Approach 1:
The patent applies preliminary action by having the source secondary node pre-obtain and include data forwarding information (QoS flow to DRB mapping relationships) in the response message to the modification request, before the actual handover or node change occurs. This ensures that the target node receives complete forwarding information in advance, enabling accurate data forwarding without information loss.
Solution Approach 2:
The patent introduces an intermediary mechanism where the source secondary node acts as a mediator between the source master node and the target node. The source secondary node intercepts the modification request, retrieves the necessary data forwarding information, and embeds it in the response message, thereby bridging the information gap that would otherwise exist in the standard XnAP interface.
3Device complexity
If no additional interface messages are introduced, then the interface complexity is kept low, but the master node cannot obtain necessary data forwarding and distribution information
Solution Approach 1:
The patent applies universality by making the existing modification request and response messages multi-functional. These standard XnAP interface messages not only perform their original function of initiating and responding to node changes but also carry additional data forwarding information (QoS flow to DRB mapping relationships) within their existing structures, eliminating the need for separate dedicated messages.
Solution Approach 2:
The patent merges the data forwarding information transmission function with the existing node change management messages. By combining multiple functions (node change initiation, response, and data forwarding information transfer) into a single message exchange flow, the patent avoids increasing interface complexity while ensuring complete information transfer.
Data Source
AI summary
Disclosed in the present application are a method and device for data forwarding. The method includes: sending to a second wireless access network node a first interface message requesting to modify the node; receiving a second interface message returned by the second wireless access network node, where the information in the second interface message includes first radio resource control (RRC) configuration information and first data forwarding and distribution information used for indicating first data that needs data forwarding; and sending a third interface message carrying the information in the second interface message to a third wireless access network node, to request the third wireless access network node to receive the first data forwarded from the second wireless access network node.