Two-Step Random Access Response Message Format Adaptation
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Solution Overview
Problem
The two-step random access mechanism in 5G NR systems is incomplete due to a format problem in the response message, which affects network communication reliability.
Innovation Solution
A random access method that includes two message formats for the response message: one format includes a contention resolution identity and a control plane message, while the other format includes only a contention resolution identity, allowing the network device to select the appropriate format based on specific cases to enhance flexibility and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single format response message is used in the two-step random access mechanism, then the message structure is simple, but the adaptability to different usage requirements is insufficient
Solution Approach 1:
The response message is segmented into two distinct formats: Format 1A containing only contention resolution identity, and Format 1B containing both contention resolution identity and control plane message. This segmentation allows the system to select the appropriate format based on specific usage requirements, thereby improving adaptability without permanently increasing complexity.
Solution Approach 2:
The message format is made dynamic by allowing the network device to switch between Format 1A and Format 1B based on real-time requirements. When control plane messages need to be delivered, Format 1B is used; otherwise, Format 1A is used. This dynamic adaptation resolves the contradiction between versatility and complexity.
2Adaptability or versatility
If the response message includes both contention resolution identity and control plane message, then the functionality is comprehensive, but the message size increases reducing resource utilization efficiency
Solution Approach 1:
The control plane message is extracted as an optional component from the response message. When not needed, only the essential contention resolution identity is transmitted (Format 1A), minimizing message size. When needed, the control plane message is added (Format 1B), providing comprehensive functionality. This extraction approach optimizes the balance between functionality and message size.
Solution Approach 2:
The response message system achieves multi-functionality through two formats: Format 1A provides minimal functionality for basic contention resolution, while Format 1B provides extended functionality by including control plane messages. This universal design allows the same message structure to serve multiple purposes based on requirements, optimizing resource utilization while maintaining comprehensive functionality when needed.
3Reliability
If the two-step random access mechanism uses a complete message format with control plane message, then the communication reliability is improved, but the processing complexity increases
Solution Approach 1:
The control plane message functionality is applied locally and selectively only when required for specific operations. Instead of always including the control plane message (which would increase complexity universally), the system applies it locally in Format 1B only when control plane communication is needed, while using the simpler Format 1A otherwise. This local quality approach maintains reliability when needed without universally increasing processing complexity.
Data Source
AI summary
This application provides a random access method and a communication apparatus. The method includes: receiving, by a terminal device, a response message from a network device; determining, by the terminal device, a message format of the response message, where the message format includes a first format or a second format; and parsing, by the terminal device, the response message based on the determined message format, where the response message in the first format includes a contention resolution identity and a control plane message; and the response message in the second format includes a contention resolution identity and includes no control plane message. A two-step random access method provided in this application includes two message formats of a random access response.