Preserving Msg3 PUSCH Transmissions During Random Access
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Solution Overview
Problem
In wireless network systems, the existing practice of canceling all uplink transmissions based on cancelation indications (CI) can reduce system performance, particularly affecting the reliability of message 3 (msg3) physical uplink shared channel (PUSCH) transmissions during random access procedures.
Innovation Solution
Implementing a method where the UE device does not cancel msg3 PUSCH transmissions even when a CI is received, and performing partial decoding of message B (msgB) to extract essential information, allowing the RA procedure to continue, thereby ensuring reliable msg3 transmission and increasing the probability of successful 2-step RACH completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If all uplink transmissions are canceled based on CI to free resources for higher priority users, then resource availability for URLLC is improved, but msg3 transmission reliability deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different uplink transmissions based on their function. Msg3 transmissions are identified as critical for random access procedure completion and are excluded from CI cancellation, while other uplink transmissions remain subject to cancellation. This selective approach preserves msg3 reliability while still allowing resource reallocation for other users.
Solution Approach 2:
The patent segments uplink transmissions into different categories: critical transmissions (msg3) that must be preserved and non-critical transmissions that can be canceled. This segmentation allows the system to apply different cancellation rules to different transmission types, ensuring that resource reallocation does not compromise the completion of ongoing random access procedures.
2Reliability
If msg3 PUSCH transmission is preserved despite CI overlap, then random access procedure completion is improved, but resource allocation flexibility deteriorates
Solution Approach 1:
The patent applies local quality by creating an exception zone for msg3 transmissions within the overall resource allocation framework. While most uplink resources remain subject to dynamic cancellation based on network conditions and priority requirements, msg3 resources are protected from cancellation to ensure random access procedure completion. This localized protection maintains system adaptability for other transmissions while ensuring reliability for critical access procedures.
Data Source
AI summary
Various aspects include a method for preserving a msg3 transmission. The method may include receiving, by a UE device, from a base station, a CI that overlaps with the msg3 transmission. Responsive to receiving the CI, the msg3 transmission is not canceled. Another method disclosed herein includes continuing an RA procedure. The method may include encoding a first part of the msgB. The method may include encoding a second part of the msgB. The method may include attempting to decode, by the UE device, the first part of the msgB. The method may include attempting to decode, by the UE device, the second part of the msgB. Based on successfully decoding of the first part of the msgB, and unsuccessfully decoding of the second part of the msgB, the method may include continuing the RA procedure.