Random Access Response Indication for 2-Step and 4-Step Process Conflict Resolution
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Solution Overview
Problem
In New Radio (NR) systems, the coexistence of terminal devices executing 2-step and 4-step random access processes leads to conflicts due to the lack of clear indication of random access response types, causing ambiguity in the random access response messages.
Innovation Solution
The proposed solution involves using indication information in random access response messages to specify the random access process type, allowing terminal devices to correctly receive responses by distinguishing between different types of random access processes through Random Access Preamble Identifiers (RAPIDs) and Media Access Control (MAC) subheader fields, ensuring compatibility with the selected process type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 2-step and 4-step random access processes coexist in the system, then the system supports multiple random access manners, but conflicts occur between terminal devices executing different random access processes
Solution Approach 1:
The patent introduces indication information as an intermediary element in the random access response message. This indication information explicitly identifies the random access process type (2-step or 4-step), enabling terminal devices to correctly distinguish and process responses according to their selected process type, thereby resolving conflicts between coexisting random access processes
Solution Approach 2:
The patent modifies the random access response message structure by adding indication information that changes the parameter of process type identification. This parameter change enables the system to differentiate between 2-step and 4-step random access responses, ensuring reliable reception by matching the terminal device's selected process type
2Reliability
If indication information is added to random access response messages, then terminal devices can correctly distinguish random access process types, but the message structure becomes more complex
Solution Approach 1:
The patent segments the random access response message into distinct functional parts: indication information for process type identification and the actual random access response content. This segmentation allows the indication information to be processed separately and efficiently, minimizing the impact on overall message structure complexity while ensuring reliable process type distinction
Data Source
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AI summary
Provided in the embodiments of the present application are a random access method and related device, which allow a terminal device to determine whether a received random access response is a random access response therefor. Said method comprises: receiving a random access response message sent from a network side; on the basis of indication information in the random access response message, determining whether a random access response in the random access response message is for a terminal device, wherein the indication information at least may indicate different types of random access responses or may indicate different types of random access processes.