Small Data Transmission RACH Resource Segmentation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing small data transmission (SDT) procedures, particularly in scenarios requiring low latency and high reliability, such as those needed for services like autonomous driving and factory automation, due to limitations in current random access channel (RACH) resource configurations.
Innovation Solution
A method and apparatus that allow for initiating a small data transmission (SDT) procedure with a first random access (RA) procedure triggered by uplink data arrival, using RACH resources not configured for SDT, and employing a prohibit timer to avoid frequent beam failure recoveries during ongoing SDT procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RACH resources are configured for SDT procedures, then small data transmission efficiency is improved, but random access procedures cannot be performed for other purposes during ongoing SDT
Solution Approach 1:
The patent divides RACH resources into two distinct segments: dedicated RACH resources for SDT procedures and non-dedicated RACH resources for other random access purposes. This segmentation allows independent optimization of each resource type without mutual interference, enabling SDT to use dedicated resources for high efficiency while other procedures use non-dedicated resources.
Solution Approach 2:
The patent creates non-dedicated RACH resources that serve multiple functions: they can be used for regular random access procedures, for beam failure recovery, and as fallback resources when SDT resources are unavailable. This multi-functionality ensures system versatility while maintaining SDT efficiency through dedicated resources.
2Reliability
If beam failure recovery procedures are allowed during ongoing SDT, then link reliability is improved, but transmission latency increases due to frequent RA procedure interruptions
Solution Approach 1:
The patent configures a prohibit timer before allowing beam failure recovery procedures during ongoing SDT. This preliminary action prevents immediate beam failure recovery attempts that would interrupt SDT transmission, allowing the SDT procedure to complete or fail naturally before recovery mechanisms are activated.
Solution Approach 2:
The patent dynamically controls beam failure recovery availability based on the SDT procedure state. When SDT is ongoing, beam failure recovery is restricted by the prohibit timer; when SDT is not ongoing, beam failure recovery is fully available. This dynamic adjustment optimizes the balance between link reliability and transmission latency.
3Speed
If multiple RA procedures are allowed concurrently, then system responsiveness is improved, but resource conflict and interference increase
Solution Approach 1:
The patent segments RACH resources into dedicated and non-dedicated categories, with dedicated resources reserved exclusively for SDT procedures. This segmentation prevents resource conflicts between SDT and other random access procedures, ensuring reliable resource allocation while maintaining system responsiveness through available non-dedicated resources.
Data Source
AI summary
Provided are a method and apparatus for small data transmission in a wireless communication system. A terminal may initiate a small data transmission (SDT) procedure. The terminal may perform a first random access (RA) procedure, while the initiated SDT procedure is ongoing and the first RA procedure is triggered by uplink data arrival. The first RA procedure may be performed using first random access channel (RACH) resources, and the first RACH resources are not configured for SDT.