RLC Entity Re-establishment for Small Data Transmission in Inactive State
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Solution Overview
Problem
Current technologies for terminal devices in inactive states face challenges with unnecessary power consumption and signaling overhead due to the inability to support data transmission, and existing small data transmission techniques are incomplete and require further development.
Innovation Solution
The method involves determining whether to re-establish a radio link control entity for data transmission in an inactive state, transmitting uplink data, and managing on-demand information and power headroom reports to optimize communication, including aborting transmissions under specific conditions and using different radio resource control messages to handle RLC re-establishment and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal device resumes connection to transmit data in inactive state, then data transmission capability is improved, but power consumption and signaling overhead increase
Solution Approach 1:
The patent segments the data transmission process into two independent phases: a first phase for transmitting first data in inactive state, and a second phase for transmitting second data after resuming connection. This segmentation allows the terminal to transmit small amounts of data without fully resuming the connection, thereby reducing power consumption and signaling overhead while maintaining data transmission capability.
Solution Approach 2:
The patent applies partial action by enabling the terminal device to transmit data in inactive state without completing the full connection resumption process. The terminal can send first data directly in inactive state, and only resume connection for second data if necessary, thus using only the necessary degree of connection activation rather than full connection resumption.
2Loss of information
If the terminal device transmits data in inactive state, then signaling overhead is reduced, but transmission reliability and robustness are compromised
Solution Approach 1:
The patent applies preliminary action by performing RLC entity re-establishment before transmitting data in inactive state. The terminal determines whether re-establishment is needed, and if so, performs it in advance to ensure proper transmission conditions are met. This preliminary preparation ensures transmission reliability while maintaining the benefits of inactive state data transmission.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal determines whether RLC entity re-establishment is needed based on transmission conditions, and where the network decides whether to indicate re-establishment in RRC resume messages. This feedback-based approach ensures that re-establishment is performed only when necessary, balancing reliability with signaling overhead reduction.
3Reliability
If RLC entity re-establishment is performed, then transmission robustness is improved, but transmission time and processing complexity increase
Solution Approach 1:
The patent applies dynamics by making the RLC entity re-establishment process conditional and flexible. The terminal dynamically determines whether re-establishment is needed based on transmission conditions, and the network dynamically decides whether to indicate re-establishment in RRC resume messages. This dynamic approach ensures re-establishment is performed only when necessary, reducing unnecessary time consumption while maintaining robustness where needed.
Solution Approach 2:
The patent applies local quality by performing RLC entity re-establishment selectively for specific radio bearers rather than all bearers. The terminal determines whether re-establishment is needed for each bearer individually, and the network can indicate re-establishment for specific bearers in RRC resume messages, thus optimizing the balance between robustness and time consumption for each local transmission path.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A terminal device determines whether a radio link control, RLC, entity re-establishment for a radio bearer is to be performed, the radio bearer being configured with a transmission of data in an inactive state. If it is determined that the RLC entity re-establishment is to be performed, the terminal device re-establishes the RLC entity. After that, the terminal device transmits uplink data in the inactive state on the radio bearer. In this way, an RLC entity re-establishment is able to be handled for radio bearer configured with SDT if the terminal device determines that the RLC entity re-establishment needs to be performed for the SDT, thereby improving performance of the SDT procedure.