SDT Uplink Triggering With SR Mask and Delayed Random Access
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Solution Overview
Problem
In the context of Small Data Transmission (SDT), unnecessary Scheduling Request (SR) and Random Access (RA) triggering occurs due to lack of UL resources and invalid synchronization signal blocks, leading to inefficient power consumption and signaling overhead.
Innovation Solution
A terminal device is configured to receive CG resources and DRBs for SDT, determining whether to apply SR masks and delay RA procedures based on BSR triggers and resource availability, thereby optimizing SR and RA triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SR and RA procedures are triggered during SDT due to lack of UL resources, then the UE can request uplink resources, but unnecessary BWP switching occurs leading to increased power consumption and signaling overhead
Solution Approach 1:
The patent changes the parameter of SR triggering by introducing an SR mask configuration that can be set to 'true' to prevent SR triggering during SDT. This parameter change allows the UE to avoid unnecessary SR and RA procedures, thereby preventing BWP switching and reducing power consumption while maintaining reliable UL resource access when needed.
Solution Approach 2:
The patent introduces an intermediary mechanism (SR mask configuration and delayed RA procedure) that mediates between the need for UL resources and the avoidance of unnecessary BWP switching. The network device configures the SR mask as an intermediary control element that prevents premature SR triggering, and the delayed RA procedure acts as an intermediary timing mechanism to align resource requests with available UL resources.
2Reliability
If SR and RA procedures are triggered during SDT, then uplink resources can be requested, but signaling overhead increases due to unnecessary procedures
Solution Approach 1:
The patent changes the parameter of SR triggering behavior through the SR mask configuration parameter. By setting sr-MaskForSDT to 'true', the system prevents unnecessary SR triggering during SDT, thereby reducing signaling overhead while maintaining the capability to request UL resources when actually needed. This parameter change directly addresses the contradiction between resource availability and signaling efficiency.
Solution Approach 2:
The delayed RA procedure introduces a timing intermediary that prevents premature random access attempts. By delaying the RA procedure until after the SDT procedure is complete or until UL resources are available, the system avoids unnecessary RA signaling while ensuring UL resources can be requested when needed. This intermediary timing mechanism reduces signaling overhead without compromising resource availability.
3Reliability
If BWP switching occurs due to SR and RA triggering, then UL resources can be acquired, but system efficiency decreases
Solution Approach 1:
The patent changes the SR triggering parameter through sr-MaskForSDT configuration, which prevents unnecessary SR triggering during SDT. This parameter change eliminates the chain reaction of SR triggering → RA triggering → BWP switching, thereby maintaining system efficiency while still allowing UL resource acquisition when actually needed through proper SDT procedures.
Solution Approach 2:
The delayed RA procedure acts as an intermediary that prevents premature BWP switching. By introducing a delay mechanism that waits for appropriate timing conditions, the system avoids unnecessary BWP switches while ensuring UL resources are acquired when needed. This intermediary timing control maintains system efficiency by preventing redundant BWP switching operations.
Data Source
AI summary
Example embodiments of the present disclosure relate to a device, method, apparatus and computer readable storage medium of scheduling request (SR) and random access (RA) triggering for small data transmission (SDT). In example embodiments, a terminal device receives, from a network device, a configuration of one or more configured grant (CG) resources for a SDT procedure and a list of one or more data radio bearers (DRBs) associated with respective logical channels (LCHs) allowed for SDT over at least one of the one or more CG resources. After the terminal device initiates the SDT procedure in an inactive mode, if the terminal determines that a buffer status report (BSR) is triggered, the terminal device determines whether a configuration of a SR mask is to be applied for a LCH configured for SDT.