2-Step Random Access Resource Management for 5G Latency
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Solution Overview
Problem
Current wireless communication systems, particularly 5G NR, face challenges in optimizing Random Access (RA) operations to accommodate varying use cases and improve network performance due to increased demand for radio access, necessitating more efficient RA procedures.
Innovation Solution
The implementation of a wireless communication method and User Equipment (UE) that supports a 2-step Random Access (RA) procedure with Contention-Free Random Access (CFRA) configuration, allowing for resource configuration and a maximum number of preamble transmissions, and automatically switching to a 4-step RA procedure if the 2-step procedure fails, thereby optimizing resource utilization and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a 2-step Random Access procedure is implemented to reduce latency and improve efficiency, then the access speed and resource utilization are improved, but the reliability deteriorates when the procedure fails due to limited retry attempts
Solution Approach 1:
The patent implements dynamic RA type selection that adapts based on network conditions and failure scenarios. The system transitions from static RA configuration to dynamic selection between 2-step and 4-step procedures, allowing the UE to switch RA types based on preamble transmission counter values and network responses, thereby optimizing both latency and reliability
Solution Approach 2:
The patent changes the parameter of RA procedure type from fixed to variable. By introducing the ability to switch between 2-step and 4-step RA procedures based on transmission counter values and network conditions, the system adjusts the RA parameters dynamically to balance latency reduction with reliability maintenance
2Productivity
If Contention-Free Random Access resources are allocated to reduce access collisions, then the access efficiency is improved, but the resource utilization deteriorates when resources are wasted due to procedure failures
Solution Approach 1:
The patent implements feedback mechanisms where the UE monitors network responses and adjusts RA behavior accordingly. The network provides feedback through rejection messages and timing advance commands, enabling the UE to adapt resource usage based on actual access outcomes, thereby reducing resource waste from failed attempts
Solution Approach 2:
The patent enables the system to discard failed CFRA attempts and recover by switching to alternative procedures. When 2-step CFRA fails, the system discards the failed resource allocation and recovers by initiating 4-step CBRA with fresh resource allocation, preventing continuous waste of dedicated CFRA resources
3Loss of energy
If the maximum number of preamble transmissions is limited to control resource usage, then the resource management is improved, but the access reliability deteriorates when the limit is reached before successful access
Solution Approach 1:
The patent prepares alternative RA procedures in advance before the maximum transmission limit is reached. The UE pre-configures both 2-step and 4-step RA capabilities, so when resource limits are approached or failures occur, the alternative procedure is already ready to execute immediately, maintaining reliability without excessive resource consumption
4Device complexity
If 2-step Random Access is used to simplify the access procedure, then the procedure complexity is reduced, but the adaptability deteriorates when the fixed procedure cannot handle diverse network scenarios
Solution Approach 1:
The patent creates a universal RA framework that incorporates both 2-step and 4-step procedures within a single MAC entity. This multi-functional design allows the system to handle diverse scenarios (initial access, handover, beam failure recovery) using appropriate RA types, enhancing adaptability while maintaining procedural simplicity through unified management
Data Source
AI summary
A wireless communication method and a User Equipment (UE) for Random Access (RA) operations are provided. The wireless communication method includes receiving, from a Base Station (BS), a Radio Resource Control (RRC) reconfiguration message including information related to a reconfiguration with synchronization, the information including a Contention Free Random Access (CFRA) configuration for 2-step Random Access (RA), the CFRA configuration configuring a resource and a maximum number of Message-A (MSGA) preamble transmissions; initiating an RA procedure, with an RA type set to a 2-step RA type, for the reconfiguration with synchronization; and discarding the resource in a case that a value of a preamble transmission counter reaches to the maximum number of MSGA preamble transmissions.