RRC Inactive Data Forwarding via Network Device Intermediary
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Solution Overview
Problem
Handover processes in wireless communication networks result in significant signaling overheads when a terminal device in an RRC inactive state moves to a new network coverage area and needs to transmit data, leading to resource wastage.
Innovation Solution
A method where the first network device configures the second network device to transmit data for the terminal device by sending a message with identification and bearer information, and the second network device acknowledges and forwards data packets directly to the first network device, reducing the need for extensive signaling interactions with the core network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device initiates an access request to the new network device during handover, then the terminal device can be handed over to the new cell, but the signaling interaction between the network device and core network increases greatly, wasting resources
Solution Approach 1:
The network device performs preliminary configuration of the data transmission path during the handover process, before actual data transmission begins. The first message is sent in advance to configure the second network device, establishing the forwarding path proactively so that when data transmission is needed, the path is already ready, avoiding repeated signaling interactions with the core network
Solution Approach 2:
The first network device acts as an intermediary between the second network device and the core network. It receives data from the terminal device via the second network device, processes the data locally, and then forwards it to the core network. This intermediary role eliminates the need for direct signaling between the second network device and core network, reducing signaling overhead
2Loss of energy
If the first network device configures the second network device to transmit data directly, then signaling overhead is reduced, but the device complexity increases due to additional configuration messages
Solution Approach 1:
The first message serves multiple functions simultaneously: it configures the second network device to forward data, establishes the data transmission path, and provides necessary routing information. This multi-functionality reduces the need for separate configuration messages, balancing the trade-off between reduced signaling overhead and configuration complexity
Data Source
AI summary
A data transmission method and a network device are provided. The method can include: determining, by a first network device, that a terminal device enters an RRC inactive state; sending, by the first network device, a first message to a second network device, where the first message is used to configure the second network device, so that the second network device transmits data for the terminal device in the RRC inactive state; and receiving, by the first network device, an acknowledgment message the first message and sent by the second network device. The second network device can transmit data of the terminal device to the first network device to enable the first network device to send the data to a core network, without having to establish a path between the second network device and the core network for the second network device to send the data to the core network.