2-Step Random Access Channel Configuration Based on RSRP Threshold
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing random access procedures, particularly in reducing signaling overhead and increasing power efficiency, especially in 5G communication systems operating in higher frequency bands.
Innovation Solution
The implementation of a 2-step random access channel (RACH) procedure, where the terminal determines the random access type based on the reference signal received power (RSRP) of the downlink path loss, and configures it as either a 2-step or 4-step RACH. This involves generating and transmitting configuration information for the 2-step RACH, including threshold values for supplementary and normal uplinks, to determine the appropriate random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 4-step RACH procedure is used, then compatibility and reliability are maintained, but signaling overhead increases and power efficiency decreases
Solution Approach 1:
The random access procedure is segmented into two distinct types: 2-step RACH for power-efficient access and 4-step RACH for reliable access. The terminal segments the access strategy based on RSRP threshold comparison, selecting appropriate procedure type to balance power efficiency and reliability requirements.
Solution Approach 2:
The random access procedure dynamically adapts between 2-step and 4-step modes based on channel conditions (RSRP levels). The base station dynamically configures threshold values and the terminal dynamically selects the access procedure type, enabling the system to optimize between power efficiency and reliability in real-time varying conditions.
2Reliability
If a 4-step RACH procedure is used, then access reliability is maintained, but signaling overhead increases
Solution Approach 1:
The random access procedure is segmented into two distinct types: 2-step RACH for power-efficient access and 4-step RACH for reliable access. The terminal segments the access strategy based on RSRP threshold comparison, selecting appropriate procedure type to balance power efficiency and reliability requirements.
Solution Approach 2:
The system changes the procedural parameter (number of steps) based on channel conditions. When RSRP is above threshold, the 2-step procedure is activated reducing signaling overhead; when below threshold, the 4-step procedure ensures reliability. This parameter adaptation resolves the contradiction between overhead and reliability.
3Loss of energy
If a 2-step RACH procedure is used, then power efficiency and signaling overhead are improved, but adaptability to varying channel conditions decreases
Solution Approach 1:
The random access procedure dynamically adapts between 2-step and 4-step modes based on channel conditions (RSRP levels). The base station dynamically configures threshold values and the terminal dynamically selects the access procedure type, enabling the system to optimize between power efficiency and reliability in real-time varying conditions.
Solution Approach 2:
The base station provides feedback through RSRP threshold configuration and the terminal provides implicit feedback through its selection of access procedure type based on measured channel conditions. This feedback mechanism ensures the system adapts to varying channel conditions while maintaining power efficiency benefits of the 2-step procedure when applicable.
Data Source
AI summary
The present disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting a higher data transfer rate than a 4th generation (4G) communication system such as long term evolution (LTE). According to various embodiments of the present disclosure, a method performed by a terminal in a wireless communication system may comprise the steps of: determining whether a reference signal received power (RSRP) of a reference for downlink path loss is equal to or greater than a threshold value; if the RSRP is greater than the threshold value, setting a random access type to 2-step random access; and if the RSRSP is not greater than the threshold value, setting the random access type to 4-step random access.