PRACH PUSCH Channel Access Priority Determination
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Solution Overview
Problem
In the NR mobile communications system, the simultaneous use of PRACH and PUSCH channels for channel access in unlicensed frequency bands leads to reliability issues due to differing channel access priority information, resulting in potential sending failures during the 2-step random access process.
Innovation Solution
A method to determine channel access priority information for PRACH and PUSCH resources based on their time-domain relationship, allowing for more reasonable channel access and improving reliability by adjusting priorities according to specific time-domain intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal device uses different channel access priority information for PRACH and PUSCH channels, then the channel access can be optimized for each channel type, but the reliability of simultaneous channel access deteriorates due to potential sending failures
Solution Approach 1:
The patent merges the channel access priority information of PRACH and PUSCH channels by determining a unified channel access priority based on the time-domain relationship between the two channels. When the time-domain interval is within a threshold, the PUSCH channel access priority is used for both channels, ensuring consistent access behavior and improving reliability while maintaining optimization benefits
Solution Approach 2:
The patent dynamically adjusts the channel access priority assignment based on the time-domain interval between PRACH and PUSCH resources. The system transitions between different priority assignment modes (same priority vs. different priority) depending on the temporal relationship, optimizing channel access efficiency for varying scenarios while maintaining reliability
2Loss of time
If the time-domain interval between PRACH and PUSCH resources is small, then the channel access process is faster, but the channel access priority determination becomes more complex
Solution Approach 1:
The patent establishes a preset threshold for the time-domain interval between PRACH and PUSCH resources in advance. This preliminary definition simplifies the runtime decision-making process by providing a clear criterion (comparing interval against threshold) for determining whether to use same or different channel access priorities, reducing complexity while enabling fast channel access
3Adaptability or versatility
If the terminal device performs separate channel access for PRACH and PUSCH, then each channel can be accessed independently, but the overall access reliability deteriorates due to potential failures in the 2-step random access process
Solution Approach 1:
The patent applies different channel access priority determination strategies to different time-domain scenarios. When the time-domain interval is small (within threshold), a unified priority approach is applied; when the interval is large (exceeds threshold), separate priority determination is used. This localized quality adjustment maintains flexibility for different scenarios while ensuring reliability in critical cases
Data Source
AI summary
A channel access method includes: determining a relationship between a PRACH resource and a PUSCH resource that are corresponding to channel access request information; and determining, based on the relationship, channel access priority information corresponding to the PRACH resource and channel access priority information corresponding to the PUSCH resource.