Random Access Preamble Counting for Power Ramping and Beam Switching
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Solution Overview
Problem
The existing single counter in the 5G NR system fails to simultaneously count power ramping and preamble transmission effectively, especially with beam switching, leading to unreliable communication.
Innovation Solution
Implement multiple counters, including a preamble transmission counter, beam preamble retransmission counter, power ramping counter, and preamble retransmission beam switching counter, to independently track and manage power ramping and beam changes during random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single counter is used to count both power ramping and preamble transmission, then the device complexity is reduced, but the measurement precision and reliability deteriorate when beam switching occurs
Solution Approach 1:
The patent divides the single counter into multiple specialized counters: a first counter for counting preamble transmissions and a second counter for counting power ramping. This segmentation allows each counter to perform its specific function independently, eliminating the interference caused by beam switching and ensuring accurate counting for both power ramping and preamble transmission separately.
2Ease of operation
If a single counter is used to count both power ramping and preamble transmission, then the ease of operation is improved, but the reliability deteriorates in multi-beam scenarios
Solution Approach 1:
The patent segments the counter management into separate functional units: one counter dedicated to preamble transmission counting and another dedicated to power ramping counting. This ensures that beam switching operations do not interfere with the accuracy of power ramping counts, thereby maintaining communication reliability in multi-beam scenarios while keeping each counter's operation simple and dedicated.
3Adaptability or versatility
If beam switching is implemented during preamble retransmission, then the adaptability is improved, but the device complexity increases due to multiple counters
Solution Approach 1:
The patent implements beam switching capability by segmenting the counting function into separate counters that can independently track preamble transmissions and power ramping events. This allows the system to adapt to different beam configurations without requiring a complex unified counter that would need to handle all scenarios simultaneously.
Solution Approach 2:
The patent extracts the power ramping counting function from the preamble transmission counting function into a separate dedicated counter. This extraction allows beam switching to be implemented for preamble retransmission without affecting the integrity of power ramping counts, as each function has its own independent counting mechanism.
Data Source
Figure 1~3
AI summary
The present disclosure provide a method and terminal for counting preamble retransmission in a random access procedure. The method includes: in a random access procedure, when detecting that no Random Access Response (RAR) is received or contention resolution fails, counting a number of times of retransmission of a preamble and/or a number of times of power ramping of transmission of the preamble according to a configured counter/counters.