2-Step RACH Fallback Control via Index Rule
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Solution Overview
Problem
In LTE and NR communication systems, when a UE fails to transmit or receive a msgA during the 2-step RACH, it often falls back to the 4-step RACH, leading to wastage of transmission resources and reduced access efficiency and transmission performance.
Innovation Solution
A method and device for determining whether content to be transmitted includes a first message based on a first index and first information, where the first index satisfies a preset rule, allowing for controlled transmission and reducing resource collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE falls back from 2-step RACH to 4-step RACH when msgA transmission fails, then transmission reliability is improved, but transmission resources are wasted and access efficiency deteriorates
Solution Approach 1:
The base station performs preliminary actions by determining in advance whether to transmit the first message based on the first index satisfying the first preset rule. This preliminary determination prevents unnecessary fallbacks and optimizes resource allocation before the actual transmission occurs, thereby improving access efficiency while maintaining reliability.
Solution Approach 2:
The system implements feedback mechanisms where the base station monitors transmission outcomes and adjusts its behavior accordingly. When msgA transmission fails, the base station uses feedback information to determine whether to proceed with 4-step RACH or handle the failure differently, optimizing the balance between reliability and efficiency.
2Reliability
If UE performs fallback from 2-step RACH to 4-step RACH, then transmission reliability is improved, but transmission resources are wasted
Solution Approach 1:
The base station performs preliminary determination before transmission based on the first index and first preset rule. This preliminary action identifies which UEs should transmit the first message and which should not, preventing unnecessary resource allocation and avoiding fallback operations that would waste transmission resources while maintaining reliable communication when needed.
Solution Approach 2:
The system changes parameters dynamically by adjusting the transmission behavior based on the first index value. When the first index satisfies the first preset rule, the base station determines to transmit the first message; otherwise, it determines not to transmit. This parameter-based control optimizes resource usage and prevents unnecessary fallbacks.
3Productivity
If base station determines to transmit first message based on preset rule, then access efficiency is improved, but transmission complexity increases
Solution Approach 1:
The base station uses parameter-based control where the first index and first preset rule form a simple decision framework. This approach improves access efficiency by clearly defining transmission conditions while keeping the control logic manageable through standardized parameter comparisons rather than complex decision trees.
Solution Approach 2:
The transmission control process is segmented into distinct determination steps: acquiring the first index, acquiring the first information, determining whether the first index satisfies the first preset rule, and then deciding whether to transmit the first message. This segmentation simplifies the overall complexity by breaking down the decision process into manageable stages.
Data Source
AI summary
The transmission method includes: acquiring a first index, acquiring first information, and in response to determining that the first index satisfies a first preset rule according to the first information, determining that content to be transmitted includes a first message; where the first message includes a sequence indicated by the first index and a payload; where the first information includes an association relationship among an index, a payload transmission resource and a demodulation reference signal, DMRS; where the resource set consists of a payload transmission resource and a DMRS; and where the method further includes: in response to determining that the first index does not satisfy the first preset rule according to the first information, determining that the content to be transmitted is the sequence indicated by the first index.