Random Access Carrier Selection for SDT in RRC Inactive State
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Solution Overview
Problem
The existing random access process in RRC_inactive state is not fully applicable for Small Data Transmission (SDT), leading to issues such as lack of valid RA resources and increased hardware complexity and power consumption.
Innovation Solution
A method for wireless communication that involves initializing a first RA process by obtaining a first carrier before the process, ensuring valid RA resources are available, and simplifying carrier selection to avoid conflicts and maintain compatibility with existing solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing random access process is used for SDT transmission in RRC_inactive state, then the process can be executed, but valid RA resources are not available and hardware complexity increases
Solution Approach 1:
The patent applies preliminary action by obtaining the first carrier before initiating the random access process when triggered by SDT. This ensures that valid RA resources are identified and prepared in advance, avoiding the need for complex runtime resource validation and reducing hardware complexity during the actual random access execution.
2Adaptability or versatility
If carrier selection is performed during RA process initialization, then compatibility with existing solutions is maintained, but conflicts between carriers selected in SDT process and RA process occur
Solution Approach 1:
The patent resolves the carrier selection conflict by performing the carrier selection action preliminarily - obtaining the first carrier before the RA process initialization when triggered by SDT. This preliminary carrier acquisition ensures consistency between the SDT process and RA process, while still allowing carrier selection functionality to be performed during initialization for other events, thus maintaining compatibility with existing solutions.
3Productivity
If the existing random access process is applied to SDT, then the process structure is maintained, but power consumption increases
Solution Approach 1:
The patent reduces power consumption by performing the carrier obtaining action preliminarily before the random access process. This allows the device to have carrier information ready in advance, avoiding repeated carrier selection and resource validation operations during the actual SDT transmission, thereby reducing overall power consumption while maintaining SDT transmission capability.
Data Source
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AI summary
The present application discloses a method and device used for wireless communication. A first node executes a first RA process, the first RA process comprising: initialization; selection of a first RA resource; and transmission of a first message in the first RA resource, wherein the first RA resource is located on a first carrier; whether the first carrier is obtained in the initialization of the first RA process is related to a trigger event of the first RA process; when the first RA process is triggered by SDT, the first carrier is obtained before the first RA process; when the first RA process is triggered by other events, the first carrier is obtained in the initialization of the first RA process; and candidates for said other events include initial access. The present application avoids the problem caused by inconsistent carrier selection, and maintains good compatibility.