Small Data Transmission Release Signaling for Subsequent SDT Handling
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing small data transmissions (SDT) due to limitations in current RRC and non-RRC based approaches, particularly in 4G and 5G networks, which affect network efficiency and resource utilization.
Innovation Solution
A method for a base station central unit (CU) that receives an RRC request message for SDT, processes assistance information for subsequent SDT, and transmits an RRC release message, enhancing the management of small data transmissions by optimizing resource allocation and reducing unnecessary signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single protocol is used for all wireless devices, then device complexity is reduced, but adaptability to different technology releases and device capabilities deteriorates
Solution Approach 1:
The system dynamically selects protocols based on device capabilities and network conditions. The base station determines whether to use 2-step or 4-step RACH procedures, and whether to apply early data transmission, based on received capability information from UEs and current traffic conditions, allowing the system to adapt without increasing inherent protocol complexity
Solution Approach 2:
The patent changes protocol parameters selectively based on device capabilities. Configuration parameters such as rach-ConfigDedicated, earlyDataTransmission configuration, and SDT configuration are adjusted according to UE capability information (e.g., edta-Compliance, sdta-Compliance), enabling adaptation to different technology releases while maintaining a unified protocol framework
2Productivity
If resource allocation is optimized for specific device types, then performance for those devices is improved, but overall system complexity increases
Solution Approach 1:
The system applies different resource allocation strategies to different device types and scenarios. UEs with early data transmission capability receive dedicated configurations for SDT during idle/inactive states, while other UEs use standard procedures. This localized optimization improves resource utilization for specific device types without requiring complete system redesign
Solution Approach 2:
The patent segments the random access procedure into different types (2-step RACH, 4-step RACH) and data transmission modes (early data transmission, standard data transmission). This segmentation allows the system to apply optimized resource allocation to specific segments (e.g., small data packets in idle state using SDT) while maintaining standard procedures for other cases, improving overall efficiency without excessive complexity
3Loss of time
If early data transmission is enabled for all UEs, then latency is reduced, but reliability deteriorates due to missed opportunities for data transmission
Solution Approach 1:
The system dynamically determines whether to use early data transmission or standard data transmission based on UE capability information and network conditions. The base station configures rach-ConfigDedicated and earlyDataTransmission parameters selectively, allowing UEs to switch between 2-step RACH with early data transmission (lower latency) and 4-step RACH with standard data transmission (higher reliability) based on current conditions
Solution Approach 2:
The patent introduces capability information exchange as an intermediary mechanism. The UE provides capability information (edta-Compliance, sdta-Compliance, dataThreshold, etc.) to the base station, which then acts as a mediator to select the appropriate transmission mode. This intermediary layer enables the system to balance latency and reliability by matching transmission methods to specific UE capabilities and traffic conditions
Data Source
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AI summary
A base station central unit, CU, receives, from a wireless device via a base station distributed unit, DU, a radio resource control, RRC, request message associated with a small data transmission, SDT, procedure of the wireless device. The base station CU receives, from the base station DU, assistance information indicating whether a subsequent SDT is expected for the SDT procedure. The base station CU transmits, to the wireless device and after a SDT of the SDT procedure, an RRC release message.