Random Access Procedure Switching for 5G Terminal Power Optimization
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Solution Overview
Problem
In 5G and NR systems, terminal devices face inefficiencies in power consumption and interference when continuously attempting 2-step random access procedures due to poor channel quality or interference, leading to unnecessary power consumption and interference with other users.
Innovation Solution
Implementing a method where the terminal device switches to a 4-step random access procedure when the sending times of the first message in the 2-step procedure exceed a threshold without receiving the second message, thereby avoiding continuous 2-step attempts and optimizing power usage and system interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the terminal device continuously attempts 2-step random access procedures, then the access speed may be improved under good channel conditions, but power consumption increases and interference to other users worsens when channel quality is poor
Solution Approach 1:
The terminal device dynamically switches between 2-step and 4-step random access procedures based on real-time channel conditions and feedback from the network. When channel conditions are good, it uses 2-step for fast access; when conditions deteriorate or thresholds are exceeded, it switches to 4-step to conserve power and reduce interference, making the access method adaptive rather than static
Solution Approach 2:
The system changes the random access procedure parameter (2-step vs 4-step) based on channel quality indicators and sending thresholds. The terminal monitors channel conditions and adjusts its access strategy by changing the procedure type, optimizing the balance between access speed and power consumption according to current system state
2Reliability
If the terminal device continuously attempts 2-step random access procedures, then access attempts are maintained, but interference to other users in the system increases
Solution Approach 1:
The terminal dynamically adjusts its access behavior by switching procedure types based on channel conditions. When interference levels rise or channel quality degrades, it transitions from 2-step to 4-step random access, maintaining access reliability while reducing the harmful interference generated by persistent 2-step attempts
Solution Approach 2:
The system converts the potential harm of continuous access attempts (which cause interference) into a benefit by using the failure condition as a trigger to switch to 4-step procedure. The harmful persistent 2-step attempts are transformed into a conditional switch that maintains reliability while eliminating the interference problem
3Use of energy by moving object
If the terminal device switches to 4-step random access procedure when thresholds are exceeded, then power consumption is reduced and interference is minimized, but access complexity increases
Solution Approach 1:
The random access procedure is segmented into two distinct paths: 2-step for fast access under good conditions, and 4-step for reliable access under poor conditions. The terminal device segments its access strategy based on channel quality thresholds, choosing the appropriate procedure type to balance power consumption and complexity
Solution Approach 2:
The terminal uses the simpler 2-step procedure as a 'disposable' fast-access option that is abandoned when conditions deteriorate. When 2-step fails or thresholds are exceeded, it switches to the more robust 4-step procedure, treating the 2-step attempt as a quick trial that is discarded when not successful
Data Source
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AI summary
Disclosed in the present application is a random access method, which may implement an effective switch between a two-step random access procedure and a four-step random access procedure. The method comprises: during a two-step random access procedure, a terminal device sending a first message for the two-step random access procedure; and if the number of times the first message for the two-step random access procedure is sent reaches a first threshold and a second message for the two-step random access procedure has not been received, the terminal device switches to a four-step random access procedure.