Inactive-State Small Data Transmission With Lossless Anchor Relocation
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Solution Overview
Problem
In inactive states of terminal devices, existing technologies require frequent connection resumption for small and infrequent data transmissions, leading to unnecessary power consumption and signaling overhead, which is inefficient and wasteful.
Innovation Solution
Implement methods and devices that enable data transmission in inactive states by determining suitable data radio bearers and thresholds for uplink data transmission, utilizing random access channels and pre-configured resources, and managing anchor relocation during cell reselection to support lossless data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If connection setup and release happens for each data transmission in inactive state, then data transmission can be performed, but power consumption and signaling overhead increase unnecessarily
Solution Approach 1:
The patent segments data transmission into two distinct paths: small data transmission (SDT) for small packets while remaining in inactive state, and conventional connection-based transmission for larger data. This segmentation allows the system to optimize power consumption for small data while maintaining reliability for larger transmissions.
Solution Approach 2:
The patent applies preliminary action by pre-configuring resources and determining ahead of time whether SDT is supported for specific data radio bearers (DRBs). The terminal device determines whether uplink data should be transmitted in inactive state based on payload size and threshold comparisons before actual transmission, avoiding unnecessary connection setup.
2Loss of information
If connection setup is performed for every small data transmission, then data can be transmitted reliably, but signaling overhead increases
Solution Approach 1:
The patent extracts small data transmission from the conventional connection setup process by enabling SDT as a separate, independent transmission path. This extraction allows small data to be transmitted without going through the full connection setup procedure, significantly reducing signaling overhead while maintaining transmission reliability.
Solution Approach 2:
The patent changes the transmission parameters by introducing payload size thresholds and DRB-specific configurations that determine whether SDT or conventional transmission is used. Network devices configure thresholds and indicators that dynamically adjust transmission behavior based on data characteristics.
3Adaptability or versatility
If SDT is enabled for all DRBs, then data transmission flexibility increases, but system complexity and configuration overhead increase
Solution Approach 1:
The patent applies local quality by configuring SDT support on a per-DRB basis rather than globally for all bearers. Each data radio bearer can have independent SDT configuration, thresholds, and indicators, allowing the system to optimize flexibility for specific traffic types while managing overall complexity.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A method comprises a terminal device determines whether one or more DRBs with uplink data to be transmitted support SDT. If the one or more DRBs support the SDT, the terminal device determines whether the uplink data is to be transmitted in the inactive state. If the uplink data is to be transmitted in the inactive state, the terminal device transmits the uplink data to a first network device in the inactive state. Upon receipt of the uplink data, the first network device transmits to a third network device a request for relocating an anchor for a context of the terminal device, the request comprising a first indication as to whether there is remaining data to be transmitted. In this way, an enhanced mechanism for SDT is achieved and lossless transmission for SDT is attained.