Wireless Random Access Procedure Segmentation for Latency and Resource Efficiency
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in performing random access procedures, particularly in terms of latency and resource utilization during signal transmission and reception in both licensed and unlicensed bands.
Innovation Solution
The proposed method involves a communication apparatus that transmits and receives signals using a 2-step or 4-step random access procedure, with specific configurations for physical random access channels and physical uplink shared channels, including differentiated random access channel occasions and preamble indices, and utilizes a communication apparatus with transceivers, processors, and memory for executing these procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 4-step random access procedure is used, then compatibility with legacy systems is maintained, but access latency increases
Solution Approach 1:
The random access procedure is segmented into two distinct modes: 2-step random access for low-latency applications and 4-step random access for legacy compatibility. The system divides the access procedure into separate pathways, allowing devices to select the appropriate mode based on service requirements, thereby resolving the contradiction between speed and compatibility.
Solution Approach 2:
The system dynamically selects between 2-step and 4-step random access procedures based on real-time conditions such as device type, service requirements, and network state. This dynamic adaptation allows the system to optimize for low latency when needed while maintaining legacy compatibility when required, resolving the fixed trade-off between the two approaches.
2Productivity
If random access channel occasions are shared between 2-step and 4-step procedures, then resource utilization improves, but collision probability increases
Solution Approach 1:
Random access channel occasions are segmented into dedicated resources for 2-step procedures and shared resources for 4-step procedures. This segmentation allows the system to maintain high resource utilization through sharing while preventing collisions by providing dedicated pathways when needed, thus resolving the contradiction between efficiency and reliability.
Solution Approach 2:
Different quality levels of resource allocation are applied locally: critical resources are dedicated with high protection against collisions, while less critical resources are shared to maximize utilization. This local differentiation resolves the contradiction by applying appropriate resource allocation strategies to different parts of the random access procedure.
Data Source
AI summary
In the transmission of message A corresponding to a 2-step random access process or message 1 corresponding to a 4-step random access process, a method and a device for transmitting/receiving a signal in a wireless communication system, according to one embodiment of the present invention, use an option in which an RO for a PRACH transmission for each message is set differently, or an option in which an RO for a PRACH transmission for each message is shared and PI is set differently.