Dynamic 2-Step to 4-Step Random Access Switching via MSGA Limits
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Solution Overview
Problem
The 5G wireless communication system faces challenges in efficiently switching between 2-step and 4-step random access procedures, particularly in scenarios where 2-step contention-free random access resources are more efficient than 4-step resources, leading to suboptimal performance in certain use cases.
Innovation Solution
The method involves receiving an RRC reconfiguration message with dedicated configuration information for random access, which includes a maximum number of message A transmissions, allowing the terminal or base station to switch to 4-step random access when the maximum number is configured, thereby utilizing more efficient 2-step contention-free random access resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the system uses 2-step contention-free random access resources, then access efficiency is improved, but the system lacks flexibility in switching to 4-step RA when needed
Solution Approach 1:
The patent implements dynamic switching between 2-step and 4-step random access procedures by configuring a maximum number of MSGA transmissions parameter. When this parameter is configured, the UE can switch from 2-step RA to 4-step RA based on transmission attempts, enabling adaptive behavior that balances efficiency and flexibility according to actual channel conditions and network requirements.
Solution Approach 2:
The patent changes the system behavior by introducing a configurable parameter (maximum number of MSGA transmissions) that controls the random access procedure type. When this parameter is present in the dedicated configuration, it enables the switching mechanism from 2-step to 4-step RA, allowing the system to adapt its operation mode based on configuration parameters.
2Adaptability or versatility
If the system always uses 4-step random access, then switching flexibility is maintained, but access efficiency deteriorates when 2-step CFRA resources are available
Solution Approach 1:
The system dynamically selects the optimal random access procedure type based on the configuration of the maximum MSGA transmissions parameter. When configured, the system prefers 2-step RA for efficiency and only switches to 4-step RA when the maximum attempts are reached, thereby maintaining flexibility while maximizing access efficiency under favorable conditions.
Solution Approach 2:
The presence or absence of the maximum MSGA transmissions parameter in the dedicated configuration changes the operational mode of the random access procedure, enabling the system to optimize for efficiency (2-step CFRA) when the parameter is configured, while retaining the ability to use 4-step RA as a fallback.
3Reliability
If the system switches to 4-step RA after 2-step RA failures, then reliability is improved through fallback mechanism, but access time increases due to procedure switching
Solution Approach 1:
The system performs preliminary configuration by setting the maximum number of MSGA transmissions parameter before the random access procedure begins. This preliminary setup enables the UE to know in advance when to switch from 2-step to 4-step RA, allowing smooth transitions without delays caused by unexpected procedure changes or additional signaling overhead during the access process.
Data Source
AI summary
A communication method and system for converging a 5th generation (5G) communication system for supporting higher data rates beyond a 4th generation (4G) system with a technology for Internet of things (IoT) are provided. The communication method and system may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method, terminal, and base station for performing a random access procedure in a wireless communication system are provided. The terminal method includes, receiving, from a base station, a radio resource control (RRC) reconfiguration message including dedicated configuration information for an RA, identifying whether information on a maximum number for message A (MSGA) transmissions is configured in the dedicated configuration information, and in case that the information on the maximum number is configured in the dedicated configuration information, performing the RA procedure based on the information on the maximum number.