Preconfigured DRBs and User Plane Tunnels for RRC Idle Data Transmission
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Solution Overview
Problem
Current communication systems experience delays in data transmission between terminal devices and core networks when establishing RRC connections, particularly in RRC idle or inactive states, due to the need for context retrieval and user plane tunnel establishment.
Innovation Solution
Implementing a network slice-specific or service-specific data radio bearer (DRB) configuration, allowing terminal devices to communicate with radio access network devices without performing RRC connection establishment procedures, using preconfigured DRBs and existing user plane tunnels to reduce end-to-end delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal device in RRC idle or inactive state performs data transmission by establishing an RRC connection, then reliable data transmission is ensured, but communication delay increases due to connection establishment time
Solution Approach 1:
The patent applies preliminary action by pre-configuring data radio bearers (DRBs) and establishing user plane tunnels between the radio access network device and core network device before the terminal device needs to transmit data. When the terminal device is in RRC idle or inactive state, the DRB configuration information is already available, and the user plane tunnel is pre-established, allowing immediate data transmission without waiting for RRC connection establishment and tunnel setup, thus reducing communication delay while ensuring reliable transmission
2Reliability
If a terminal device establishes an RRC connection before data transmission, then dedicated control plane connection and user plane tunnel are established ensuring reliable communication, but the complexity of the communication procedure increases
Solution Approach 1:
The patent extracts the data transmission function from the complete RRC connection establishment procedure. By separating the user plane data transmission path from the control plane RRC connection setup, the patent allows terminal devices to transmit data using pre-configured DRBs without going through the full RRC connection establishment process. This extraction reduces procedure complexity while maintaining communication reliability through the pre-established user plane tunnel
3Reliability
If the radio access network device waits to obtain terminal context and establish user plane tunnel before sending data, then proper data routing is ensured, but end-to-end delay increases
Solution Approach 1:
The patent applies preliminary action by having the radio access network device obtain the terminal context and establish the user plane tunnel in advance, before the terminal device actually needs to transmit data. The DRB configuration information is prepared beforehand, and the user plane tunnel is set up prior to data transmission. This allows the terminal device to immediately send data without the radio access network device waiting for context retrieval and tunnel establishment, significantly reducing end-to-end delay while ensuring accurate data routing
Data Source
AI summary
The present disclosure discloses example communication apparatuses. One example communication apparatus includes sending request information from a first network device to a second network device, where the request information includes an identifier of a network slice, configuration information of a data radio bearer corresponding to the identifier of the network slice, and first general packet radio service tunneling protocol-user plane (GTP-U) tunnel address information corresponding to the identifier of the network slice. Feedback information is received by the first network device and from the second network device, where the feedback information includes second GTP-U tunnel address information corresponding to the identifier of the network slice. The first GTP-U tunnel address information and the second GTP-U tunnel address information identify a user plane tunnel that corresponds to the identifier of the network slice and that is between the first network device and the second network device.