Two-Step Random Access Uplink Feedback Resource Allocation
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Solution Overview
Problem
Existing wireless communication networks face challenges in delivering high traffic capacity and low latency, particularly in the random access procedure, where current signaling approaches are inefficient and lead to increased latency and reduced responsiveness.
Innovation Solution
A method and apparatus for a two-step random access procedure that involves resource allocation for multiple feedbacks, enabling improved transmission efficiency by determining UL resources based on received configuration information, allowing for multiplexing of responses and explicit or implicit signaling of PUCCH resources for multiple terminal devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a traditional four-step random access procedure is used, then the terminal device can establish a connection with the network node, but the latency is increased and responsiveness is reduced
Solution Approach 1:
The patent segments the random access response into multiple feedback messages (success response and fallback response) that can be transmitted separately. This segmentation allows the terminal device to quickly identify successful access without waiting for complete multi-step procedures, thereby reducing latency and improving responsiveness while maintaining connection establishment capability.
Solution Approach 2:
The network node performs preliminary actions by transmitting multiple feedback messages in advance within the same time-frequency resource. The terminal device receives these feedback messages before completing the full random access procedure, enabling faster decision-making and reducing overall access latency.
2Productivity
If resource allocation for multiple feedbacks is implemented, then transmission efficiency is increased, but device complexity increases
Solution Approach 1:
The patent employs a universal resource allocation mechanism where the same time-frequency resource is used for transmitting multiple different feedback messages (success response, fallback response, and additional feedback). This multi-functionality approach increases transmission efficiency without requiring separate dedicated resources for each feedback type, thereby limiting the increase in device complexity.
Solution Approach 2:
The terminal device uses copying mechanisms to process multiple feedback messages by applying the same decoding and processing logic to different feedback types transmitted in the same resource. This approach maintains processing efficiency while managing device complexity through standardized handling procedures.
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 2D~3A
AI summary
Various embodiments of the present disclosure provide a method for random access. The method which may be performed by a terminal device comprises receiving resource configuration information from a network node. The method further comprises determining an uplink resource for a feedback to a response message from the network node in a two-step random access procedure, based on the received resource configuration information.