RDS Mechanism for Reliable 5G Small Data Transfer
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Solution Overview
Problem
Current wireless communication systems face challenges in providing reliable data services for unstructured data, particularly in 5G systems, where efficient small data transmissions are needed for low-complexity, power-constrained devices with low mobility, and there is a requirement for resource-efficient signaling load and support for both IP and non-IP data delivery.
Innovation Solution
The implementation of a Reliable Data Service (RDS) mechanism using the NAS transport between UE and AMF, which allows for small data delivery without establishing data radio bearers, utilizing the Reliable Data Protocol specified in 3GPP TS 24.250, and employing RDS headers to manage packet acknowledgments and eliminate duplicates, enabling support for both roaming and non-roaming scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data radio bearers are established for small data transmissions, then reliable data delivery is ensured, but signaling load and network resource consumption increase
Solution Approach 1:
The patent extracts the data transmission function from the traditional data radio bearer establishment process. By allowing small data transmissions through existing signaling channels (NAS transport) rather than establishing dedicated data bearers, the solution removes the complexity of bearer setup while maintaining delivery reliability through RDS protocol mechanisms like acknowledgments and retransmissions.
Solution Approach 2:
The patent makes the signaling channels serve multiple functions - both control plane signaling and small data transmission. The NAS transport mechanism, originally designed for control signaling, is extended to carry user data directly, eliminating the need for separate data bearer establishment and reducing overall signaling load.
2Adaptability or versatility
If traditional data transmission protocols are used, then comprehensive data delivery is supported, but power consumption and device complexity increase for low-power devices
Solution Approach 1:
The patent employs lightweight, temporary data transmission mechanisms for small data packets rather than establishing permanent or semi-permanent data bearers. The RDS protocol uses simple acknowledgment and retransmission mechanisms that consume minimal power, suitable for intermittent small data transmissions from power-constrained devices.
Solution Approach 2:
Instead of implementing full-fledged data transmission protocols with all their overhead, the patent uses a partial implementation focused only on the essential functions needed for small data - simple acknowledgment mechanisms and basic retransmission. This reduced protocol suite significantly lowers power consumption while maintaining adequacy for small data transmissions.
3Productivity
If RDS mechanism is implemented for small data, then signaling load is reduced, but support for both IP and non-IP data requires additional protocol handling
Solution Approach 1:
The patent segments the data transmission functionality into distinct layers - the RDS protocol layer handles reliability mechanisms (acknowledgments, retransmissions) while the underlying NAS transport layer handles the actual data carriage. This segmentation allows the reliability functions to be implemented independently of the IP/non-IP data format, simplifying protocol handling.
Solution Approach 2:
The patent introduces the RDS protocol as an intermediary layer between the application data (IP or non-IP) and the NAS transport mechanism. This intermediary handles the complexity of reliability management, protocol versioning, and format adaptation, shielding the lower layers from the complexity of supporting both IP and non-IP data while maintaining signaling efficiency.
Data Source
AI summary
Systems and methods provide solutions for reliable data transfer in a mobile communication network. A user equipment (UE) may indicate to the mobile communication network a capability of the UE to support a reliable data service protocol. The UE may process non-access stratum (NAS) messages, for both mobile originated (MO) data transfer and mobile terminated (MT) data transfer, using the reliable data service protocol to determine whether protocol data units (PDUs) of the NAS messages require no acknowledgement, require acknowledgment, or include an acknowledgement, and to detect and eliminate duplicate PDUs received at the UE in the NAS messages.