Small Data Transmission Resource Selection in RRC_INACTIVE
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Solution Overview
Problem
Existing communication technologies face challenges in coordinating multi-shot small data transmissions (SDT) and arranging subsequent data transmissions during RRC_INACTIVE mode, particularly in 5G NR networks, without transitioning to RRC_CONNECTED mode.
Innovation Solution
Implementing logical channel restrictions for resource selection in RRC_INACTIVE mode, allowing specific resource access based on configured grant (CG) and random access (RA) procedures, and using these restrictions to determine target resources for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SDT resources are configured for different procedures (RA and CG), then data transmission flexibility is improved, but resource coordination complexity increases
Solution Approach 1:
The patent applies logical channel restrictions to differentiate resource access rights for different logical channels. Specifically, it configures restrictions that allow first logical channels to access both RA-based and CG-based SDT resources, while restricting second logical channels to only CG-based resources. This local differentiation resolves the coordination complexity by clearly defining access rules for different data types without requiring complex centralized coordination.
Solution Approach 2:
The patent segments SDT resources into distinct types (RA-based and CG-based) and applies different logical channel restriction rules to each segment. By dividing the resource access control into separate configurable restriction sets, the system manages complexity through modular resource allocation rather than monolithic coordination.
2Reliability
If logical channel restrictions are implemented for SDT resource selection, then service isolation is improved, but configuration complexity increases
Solution Approach 1:
The patent implements service isolation by applying specific logical channel restrictions to different logical channels. Each restriction set is tailored to the specific service requirements - for example, high-priority services can be configured with restrictions that allow access to all SDT resources, while lower-priority services are restricted to specific resource types. This localized configuration approach achieves reliable service isolation while keeping the configuration manageable through targeted rather than universal rules.
3Use of energy by moving object
If the terminal device remains in RRC_INACTIVE mode for SDT, then power consumption is reduced, but transmission coordination capability deteriorates
Solution Approach 1:
The patent enables the terminal device to autonomously determine appropriate SDT resources by evaluating logical channel restrictions locally. The device self-manages the coordination of multi-shot SDT transmissions and arranges subsequent data transmissions without needing to transition to RRC_CONNECTED mode or seek network coordination, thereby maintaining low power consumption while achieving adequate transmission coordination capability.
Solution Approach 2:
The network configures logical channel restrictions in advance before the terminal enters RRC_INACTIVE mode. These pre-configured restrictions provide the terminal with all necessary coordination rules needed for autonomous SDT operations, eliminating the need for real-time network coordination and enabling the device to maintain inactive state while still performing coordinated transmissions.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices, apparatuses, and computer readable medium for small data transmission (SDT). A first device, in response to first data to be transmitted via a SDT corresponding to a first set of resources for a random access procedure and a second set of resources for a configured grant procedure, determine a target resource for at least a part of the first data based on a logical channel restriction on the SDT; and transmit, to a second device, at least the part of the first data on the target resource. In this way, the SDT procedure can be performed with logical channel restrictions, which allows a better isolation of services through specific resource selection. The communication efficiency and network performance can also be improved.