UE Data Forwarding via XnAP/F1AP Without GTP-U Tunnels
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in data forwarding for user equipment in the RRC inactive state, leading to unnecessary signaling overhead and delays due to the requirement of state transitions and resource wastage in tunnels for small or sporadic data transmissions.
Innovation Solution
Implement data forwarding mechanisms that utilize XnAP/F1AP messages to piggyback user packets without establishing GTP-U tunnels, using new class 2 procedures like XnAP: USER DATA TRANSFER or F1AP: USER DATA TRANSFER, and introduce a 'User Data Container' information element to facilitate efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If GTP-U tunnels are established for data forwarding, then data transmission capability is improved, but signaling overhead and resource wastage increase for small or sporadic data transmissions
Solution Approach 1:
The patent extracts the user data from the traditional GTP-U tunnel establishment process. Instead of requiring full tunnel setup for small data transmissions, the invention allows user data to be directly embedded in XnAP/F1AP messages, eliminating the need for GTP-U tunnel establishment and reducing signaling overhead while maintaining data transmission capability
Solution Approach 2:
The patent merges user data with control plane messages (XnAP/F1AP). By piggybacking user data on existing signaling messages, the invention combines data transmission with control signaling, eliminating separate data forwarding paths and reducing resource consumption for small or sporadic data transmissions
2Device complexity
If state transitions are required for data forwarding, then connection management is simplified, but transmission delays increase
Solution Approach 1:
The patent prepares the data forwarding path in advance by establishing context information at the anchor node before data transmission is needed. When small data arrives, the gNB can immediately forward it through the pre-prepared path without requiring state transitions, thus reducing transmission delays while maintaining simplified connection management
Solution Approach 2:
The patent introduces dynamic data forwarding capability that operates independently of RRC state transitions. The system can dynamically forward small data in both RRC connected and inactive states, allowing flexible adaptation to different data arrival patterns without being constrained by static state machine transitions
3Reliability
If GTP-U tunnels are established for each data transmission, then data forwarding reliability is improved, but resource usage efficiency decreases for small or sporadic data
Solution Approach 1:
The patent makes the control plane messages (XnAP/F1AP) multi-functional by enabling them to carry both control signaling and user data simultaneously. This universal message structure eliminates the need for dedicated GTP-U tunnels for small data, improving resource usage efficiency while maintaining reliable data forwarding through the existing control plane infrastructure
Data Source
AI summary
Presented are systems, methods, apparatuses, or computer-readable media for data forwarding for user equipment with data transmission. A non-anchor node may receive user data of a wireless communication device to send uplink. The non-anchor node may decode the user data into an uplink air interface protocol protocol data unit (PDU), using a partial portion of context information of the wireless communication device. The non-anchor node may send the uplink air interface protocol PDU in a user data container of a first message, to an anchor node having full context information of the wireless communication device.