Data Transmission via Target and Anchor Base Stations
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Solution Overview
Problem
In mobile communication technologies, when a terminal device in an inactive state attempts to transmit data via a user plane, it is unclear how the data is delivered to the core network if the target base station is not the anchor base station.
Innovation Solution
The proposed solution involves a data transmission method where the target base station receives an RRC resume request message and data from the terminal device, and then transmits a retrieve terminal context request message to the anchor base station. The anchor base station responds with indication information on its capability to transmit the data to the core network, and the data is subsequently transmitted by either the anchor base station or the target base station based on this indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data transmission is performed via user plane before terminal device enters connected state, then data transmission efficiency is improved, but it is unclear how data is delivered to core network when target base station is not anchor base station
Solution Approach 1:
The patent introduces an intermediary information element (first indication information) that is carried in the RRC resume request message. This indication information serves as a mediator to convey data delivery path information from the target base station to the anchor base station, enabling the anchor base station to understand whether it should forward data to the core network or whether the target base station will handle data transmission directly.
2Loss of time
If terminal device transmits data via user plane in inactive state, then RRC connection restoration time is reduced, but data transmission reliability is compromised when target base station is not anchor base station
Solution Approach 1:
The patent implements a feedback mechanism where the target base station includes first indication information in the RRC resume request message sent to the anchor base station. This indication information provides feedback about the data delivery capability of the target base station, enabling the anchor base station to make reliable decisions about data forwarding without requiring full RRC connection restoration.
Data Source
AI summary
Provided is a data transmission method, including: receiving, by a target base station, a RRC resume request message and first data that are transmitted by a terminal device; transmitting, by the target base station, a retrieve terminal context request message to an anchor base station, the retrieve terminal context request message carrying the first data or first indication information indicating transmission of the first data; and receiving, by the target base station, a reply message transmitted by the anchor base station, the reply message carrying second indication information indicating whether the anchor base station is capable of transmitting the first data to a core network. The first data is transmitted to the core network by the target base station in response to the second indication information indicating that the anchor base station is incapable of transmitting the first data to the core network.