Dynamic Random Access Procedure Selection for Communication Terminals
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Solution Overview
Problem
Current communication systems face challenges in efficiently managing access procedures for terminals, particularly in high-frequency bands, where existing methods lack flexibility and efficiency in supporting both 2-step and 4-step random access procedures.
Innovation Solution
The proposed solution involves a method where terminals receive configuration information for random access procedures from base stations, transmit random access messages with specific indicators, and receive responses, allowing for the identification of message types and subsequent adjustments in access procedures based on modulation and coding schemes, enabling efficient performance of either 2-step or 4-step random access depending on conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single random access procedure is used for all terminals, then the system is simple to operate, but it cannot adapt to different terminal conditions and achieves lower efficiency
Solution Approach 1:
The patent implements dynamic random access procedure selection where terminals can switch between 2-step and 4-step procedures based on their operational state. The base station configures different random access occasions and resources for different terminal states (RRC_IDLE, RRC_INACTIVE, RRC_CONNECTED), allowing the system to adapt dynamically rather than using a static single procedure for all terminals.
Solution Approach 2:
The patent changes key parameters of the random access procedure based on terminal state, including the number of steps (2 or 4), available preamble formats, and resource allocation. The base station provides configuration information that specifies different parameters for different terminal states, enabling parameter-based adaptation of the access procedure.
2Speed
If 2-step random access is used for all terminals, then access speed is improved, but reliability decreases for terminals in certain states
Solution Approach 1:
The patent applies different random access procedure qualities to different terminal states. Terminals in RRC_CONNECTED state use the faster 2-step procedure with configured uplink grants, while terminals in RRC_IDLE or RRC_INACTIVE states use the more reliable 4-step procedure. This local differentiation of procedure quality based on terminal state achieves both speed improvement where applicable and reliability where needed.
3Productivity
If multiple random access procedures are supported with detailed configuration, then access efficiency for different terminal states is improved, but configuration complexity and signaling overhead increase
Solution Approach 1:
The base station performs preliminary configuration of random access parameters before terminals need to access. Configuration information including 2-step and 4-step procedure parameters, preamble formats, and resource allocations is provided in advance through system information or dedicated signaling. This preliminary action reduces the complexity burden on terminals during actual access operations.
Solution Approach 2:
The patent creates a universal random access configuration framework that handles multiple terminal states through a unified configuration structure. The base station provides configuration information that universally covers both 2-step and 4-step procedures, with terminals selecting the appropriate procedure based on their state. This multi-functional configuration approach improves efficiency while managing complexity through standardization.
Data Source
AI summary
Provided is a method for controlling the access of a terminal in a communication system. An operation method of a terminal comprises the steps of: receiving, from a base station, configuration information for a two-step random access procedure; transmitting, to the base station, RA MSG-A including an RA preamble and an RA payload, on the basis of the configuration information; and receiving, from the base station, RA MSG-B, which is a response to the RA MSG-A. Therefore, communication system performance can be improved.