PUSCH Resource Selection for 2-Step Random Access EDT
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Solution Overview
Problem
In the context of 5G NR systems, terminal devices face challenges in selecting an appropriate uplink resource to transmit Early Data Transmission (EDT) data during the 2-step random access procedure, particularly in scenarios like IoT and wearable devices, where efficient small data transmission is crucial.
Innovation Solution
A method and device for selecting a Physical Uplink Shared Channel (PUSCH) resource for EDT data transmission, which involves identifying suitable PUSCH resources based on criteria such as proximity to a target time domain location, size, and quality of service, to ensure effective data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a terminal device uses the 2-step random access procedure for uplink transmission, then the access speed and efficiency are improved, but the terminal device cannot select an appropriate PUSCH resource for EDT data transmission
Solution Approach 1:
The patent segments the random access procedure into two distinct steps: Step 1 includes PRACH preamble transmission and PUSCH data transmission, while Step 2 includes the random access response. This segmentation allows the terminal to select appropriate PUSCH resources for EDT data in Step 1, resolving the resource selection limitation while maintaining fast access speed.
Solution Approach 2:
The patent introduces dynamic PUSCH resource selection mechanisms where the terminal can dynamically choose from multiple configured PUSCH resources based on channel conditions, data size, and quality of service requirements. This dynamic approach enables flexible resource allocation in the 2-step RACH procedure, solving the static resource limitation.
2Use of energy by moving object
If EDT data is transmitted without RRC state change, then power consumption is reduced and transmission efficiency is improved, but the terminal lacks dedicated uplink resources for transmission
Solution Approach 1:
The patent configures multiple PUSCH resources in advance for the 2-step random access procedure, including specific resources for EDT data transmission. By pre-configuring these resources, the terminal can immediately use them for EDT transmission without transitioning to RRC connected state, thus saving power while having dedicated resources available.
Solution Approach 2:
The patent designs the PUSCH resources in the 2-step RACH procedure to serve multiple functions: they can be used for normal random access, for EDT data transmission, and for uplink data transmission in idle/inactive states. This multi-functionality provides dedicated resources for EDT without requiring additional resource allocation, solving the resource quantity limitation.
3Reliability
If multiple PUSCH resources are configured for Msg A transmission, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces multiple parameters for PUSCH resource configuration, including resource size, time domain location, frequency domain location, and quality of service parameters. By changing and optimizing these parameters, the system achieves high transmission reliability through diverse resource options while managing device complexity through standardized parameter sets and selection criteria.
Solution Approach 2:
The patent applies different quality levels to different PUSCH resources based on their configuration parameters. Some resources are optimized for small data packets, others for larger transmissions, and some for specific channel conditions. This local quality differentiation improves overall reliability by matching resources to specific transmission needs while keeping the selection process manageable through clear matching rules.
Data Source
AI summary
Embodiments of this disclosure disclose a method for transmitting EDT data and a device. The method is executed by a terminal device and includes: selecting a PUSCH resource from target physical uplink shared channel PUSCH resource(s), where the target PUSCH resource is a PUSCH resource used for Msg A transmission in a 2-step random access procedure; and transmitting EDT data by using the selected PUSCH resource.