RNTI Configuration Mapping for RRC Inactive Data Transmission
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Solution Overview
Problem
Terminal devices in RRC inactive mode cannot obtain a dedicated RNTI configuration for descrambling downlink control information, preventing data transmission with the network device.
Innovation Solution
The terminal device obtains a cell identifier through synchronization signals and uses the corresponding configuration information to acquire an RNTI, enabling it to descramble DCI and perform data transmission in RRC inactive mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal device enters RRC inactive mode to save energy and reduce network signaling, then energy consumption is reduced and network load is decreased, but the terminal device cannot obtain a dedicated RNTI configuration and cannot perform data transmission with the network device
Solution Approach 1:
The network device pre-configures multiple RNTI values and their corresponding mapping relationships in the RRC release message before the terminal enters inactive mode. This preliminary configuration enables the terminal to quickly acquire the appropriate RNTI without additional signaling when data transmission is needed in inactive mode, thus maintaining energy savings while restoring transmission capability.
2Ease of operation
If the terminal device stays in RRC connected mode to maintain data transmission capability, then data transmission can be performed continuously, but energy consumption increases and network resources are occupied
Solution Approach 1:
The terminal device uses the pre-configured RNTI mapping relationships to autonomously determine the appropriate RNTI for data transmission while in inactive mode, without requiring network assistance or additional signaling. This self-service mechanism eliminates the need to maintain continuous RRC connected status, enabling energy-efficient operation while preserving transmission capability when needed.
3Ease of operation
If the network device allocates a dedicated RNTI to the terminal device in RRC inactive mode, then data transmission capability is restored, but network signaling overhead and device complexity increase
Solution Approach 1:
The pre-configured RNTI mapping relationships serve multiple functions: they enable the terminal to acquire RNTI in inactive mode, provides fallback options for different scenarios, and eliminate the need for separate RNTI allocation procedures. This multi-functional approach restores transmission capability without proportionally increasing configuration complexity.
Data Source
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AI summary
Embodiments of this application provide a configuration information obtaining method and an apparatus, which may be applied to a scenario in which a terminal device obtains an RNTI. The terminal device may be in RRC inactive mode. The method may include: obtaining a cell identifier, and obtaining first configuration information based on the cell identifier, where there is a correspondence between the cell identifier and the first configuration information, and the first configuration information is used to configure an RNTI; and performing one or more of the following operations based on the first configuration information: receiving downlink control information, receiving downlink data, sending uplink control information, or sending uplink data. According to embodiments of this application, the terminal device can obtain the RNTI used by the terminal device in RRC inactive mode, so that the terminal device can transmit data at low power consumption.