Small Data Transmission Identifier Selection for 5G NR
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Solution Overview
Problem
In the context of 5G NR, existing technologies face challenges in efficiently managing small data transmission (SDT) in the RRC_INACTIVE state, where the use of full I-RNTI for resuming radio connections increases message size, limiting the payload capacity for small data transmissions.
Innovation Solution
The solution involves determining whether to use the full I-RNTI or the short I-RNTI for resuming radio connections based on specific conditions, allowing for the use of a shorter identifier in certain scenarios, thereby reducing the size of the RRCResumeRequest message and increasing the payload capacity for small data transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full I-RNTI is used for resuming radio connections, then unique identification of terminal device is ensured, but message size increases limiting payload capacity for small data transmissions
Solution Approach 1:
The patent segments the identification process by introducing two types of identifiers: full I-RNTI for initial connection resume and short I-RNTI for subsequent small data transmissions. This segmentation allows the system to use only the necessary portion of the identifier for each transmission type, reducing overhead for small data while maintaining unique identification capability.
Solution Approach 2:
The patent changes the parameter of identifier length based on the transmission scenario. For initial connection resume, full I-RNTI (longer identifier) is used to ensure unique identification. For subsequent small data transmissions, short I-RNTI (shorter identifier) is used to increase payload capacity. This dynamic parameter change resolves the contradiction between identification reliability and payload capacity.
2Reliability
If full I-RNTI is used in RRCResumeRequest message, then terminal device identification is maintained, but available bits for user data transmission are reduced
Solution Approach 1:
The patent implements a dynamic identifier selection mechanism where the system transitions from using full I-RNTI to short I-RNTI based on the transmission stage. The full I-RNTI is used in the initial RRCResumeRequest message for reliable identification, while short I-RNTI is used in subsequent messages to maximize data transmission efficiency. This dynamic adaptation resolves the contradiction between identification reliability and productivity.
3Quantity of substance
If shorter identifier is used for SDT, then payload capacity increases, but device complexity for managing multiple identifier types increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring both full I-RNTI and short I-RNTI in the RRCRelease message before the terminal enters inactive state. This preliminary configuration simplifies subsequent identifier management, as the terminal already has both identifiers available and only needs to select the appropriate one based on the transmission scenario, reducing the complexity of real-time identifier management.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices, apparatuses, and computer readable medium for small data transmission (SDT). The method comprises in accordance with a determination that a first condition related to Small Data Transmission (SDT) is met, determining a target identifier associated with an inactive state of the first device; and transmitting, to the second device, a first message for the SDT comprising the target identifier. By using an I-RNTI determined based on the SDT type, which may be the short I-RNTI or a new I-RNTI even shorter than the short I-RNTI, bits can be saved and used for UL data that can be transmitted while respecting a maximum SDT data threshold configured by the network device.