Inactive-State UE Small Data Transmission on Configured Grants
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Solution Overview
Problem
Existing communication systems face challenges in efficiently performing Small Data Transmission (SDT) under the RRC inactive state, leading to unnecessary power consumption and signaling overhead due to the need for connection restoration during data transmission.
Innovation Solution
The method involves performing SDT on a configured grant (CG) resource of a first SSB without validating its validity, and releasing or suspending resources for other SSBs, thereby reducing power consumption and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection restoration is performed during SDT in inactive state, then data transmission reliability is improved, but power consumption and signaling overhead increase
Solution Approach 1:
The patent extracts the connection restoration step from the SDT process by enabling direct data transmission on configured grant resources while in inactive state, separating the data transmission function from the connection management function, thus achieving reliable SDT without unnecessary connection restoration
Solution Approach 2:
The system uses self-service by maintaining configured grant resources that can be directly utilized for SDT in inactive state without requiring network assistance for connection restoration, allowing the UE to autonomously perform SDT using pre-configured resources
2Reliability
If connection restoration is performed during SDT in inactive state, then data transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent removes the connection restoration signaling from the SDT process by allowing direct transmission on configured grant resources, extracting the essential data transmission function from the overhead-intensive connection management procedures
Solution Approach 2:
The system performs preliminary action by pre-configuring grant resources during the connected state, which can then be directly used for SDT in inactive state without requiring additional signaling for resource allocation, thus reducing signaling overhead
3Manufacturing precision
If validity determination of CG resource is performed during second SDT, then resource allocation accuracy is improved, but power consumption and signaling overhead increase
Solution Approach 1:
The patent applies universality by making the configured grant resource valid for multiple SDT occasions including both first and second SDT, allowing the same resource to be universally used without re-validation, thus reducing power consumption while maintaining allocation accuracy
Solution Approach 2:
The system performs preliminary action by determining the validity of CG resources during the first SDT or configuration phase, and this validity determination result is reused for subsequent second SDT, avoiding redundant validation operations and reducing power consumption
4Manufacturing precision
If validity determination of CG resource is performed during second SDT, then resource allocation accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent makes the resource allocation decision universal by determining CG resource validity once that applies to multiple SDT occasions, eliminating the need for repeated validity determination signaling in each subsequent SDT
Solution Approach 2:
The system performs preliminary action by determining resource validity in advance during first SDT or configuration, and reusing this determination for second SDT, thereby avoiding redundant signaling overhead for validity checking
Data Source
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AI summary
Provided are a communication method and a communication apparatus. The method includes: performing, by a terminal device, first Small Data Transmission (SDT) on a pre-Configured Grant (CG) resource corresponding to a first Synchronization Signal Black (SSB), wherein the terminal device is in an inactive state; and performing, by the terminal device, second SDT on the CG resource corresponding to the first SSB. According to the method in the embodiments of the disclosure, SDT of a User Equipment (UE) in an inactive state can be implemented.