Small Data Transmission Scheduling Request Masks for Unnecessary 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 occur 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 a scheduling request mask and delay RA procedures based on buffer status and synchronization signal availability, thereby optimizing SR and RA triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SR resource is not configured for SDT, then UE can perform SDT in inactive state, but unnecessary RA triggering occurs when BSR is triggered
Solution Approach 1:
The network configures SR resources and SR masks in advance for SDT before the UE needs to transmit data. When BSR is triggered, the UE checks the pre-configured SR mask to determine whether to trigger SR, preventing unnecessary RA procedures. This preliminary configuration enables the UE to make informed decisions about resource requests without immediately resorting to random access.
Solution Approach 2:
The SR mask acts as an intermediary mechanism between the BSR trigger and the SR/RA triggering. Instead of directly triggering RA when BSR occurs, the UE evaluates the SR mask configuration first. This intermediary layer filters out unnecessary RA triggers by allowing the UE to use existing SR resources when appropriate, thereby reducing harmful RA triggering while maintaining SDT functionality.
2Ease of operation
If SR is triggered due to lack of UL resources, then UE can request resources, but unnecessary BWP switching occurs
Solution Approach 1:
The network configures different SR masks for different logical channels and BWP contexts. When the UE triggers SR, it evaluates the SR mask specific to the current BWP and logical channel configuration. This localized configuration allows the UE to determine whether SR triggering will cause BWP switching, and potentially suppress the SR trigger if the mask indicates that resources are available in the current BWP, thereby avoiding unnecessary BWP switching while maintaining resource request capability.
3Reliability
If RA procedure is initiated immediately, then random access can be performed, but power consumption increases
Solution Approach 1:
The SR mask configuration provides feedback information to the UE about whether SR resources are available and whether triggering SR would be beneficial. The UE uses this feedback to make intelligent decisions about RA initiation. When the SR mask indicates that SR resources are available and appropriate, the UE can suppress immediate RA triggering, reducing power consumption while maintaining reliable random access capability when truly needed.
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.