PRACH Random Access Retransmission Control for Resource Conflicts
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Solution Overview
Problem
The introduction of a retransmission-based backoff mechanism for multiple PRACH transmissions in wireless communication systems can lead to resource conflicts and reduced access performance due to increased PRACH transmission quantities, especially when multiple nodes adjust their transmission quantities without proper coordination.
Innovation Solution
A method for determining the quantity of PRACH retransmissions using counters and parameters to optimize the backoff mechanism, reducing resource conflicts and improving access performance by ensuring diverse PRACH transmission quantities among nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple nodes increase PRACH transmission quantities based on a backoff mechanism, then coverage performance is improved, but resource conflicts and backoff mechanism conflicts occur
Solution Approach 1:
The patent changes the parameter of PRACH transmission quantity from a uniform increase based on backoff to a diversified selection from multiple candidate quantities. Nodes select from {Q1, Q2, ..., Qm} where each Qi represents a different transmission quantity, thereby maintaining coverage improvement while reducing resource conflicts through parameter diversification.
Solution Approach 2:
The patent introduces dynamic selection of PRACH transmission quantities based on node-specific parameters such as coverage enhancement levels and path loss conditions. Each node dynamically adjusts its transmission quantity selection from the candidate set based on its specific channel conditions and coverage requirements, making the system adaptive rather than static.
2Reliability
If multiple nodes increase PRACH transmission quantities based on a backoff mechanism, then coverage performance is improved, but access performance deteriorates
Solution Approach 1:
The patent changes the transmission quantity parameter from uniform backoff-based increase to diversified selection from candidate quantities {Q1, Q2, ..., Qm}. This allows nodes to select appropriate transmission quantities based on their specific conditions, improving both coverage and access performance simultaneously by avoiding the pitfalls of uniform increase.
Solution Approach 2:
The patent applies local quality by allowing different nodes to select different PRACH transmission quantities from the candidate set based on their specific coverage enhancement levels and path loss conditions. This localized adaptation ensures that each node uses the most appropriate transmission quantity for its specific situation, optimizing overall system access performance.
3Area of stationary object
If PRACH transmission quantity is increased uniformly, then coverage area is expanded, but resource allocation efficiency decreases
Solution Approach 1:
The patent introduces multiple candidate PRACH transmission quantities {Q1, Q2, ..., Qm} corresponding to different coverage enhancement levels. Instead of uniform increase, nodes select from these diverse parameters based on their specific needs, expanding coverage area efficiently while maintaining resource allocation efficiency through parameter diversification.
Solution Approach 2:
The patent enables nodes to select partial increases in transmission quantity from the candidate set based on their specific coverage requirements. Rather than all nodes uniformly increasing to maximum levels, each node performs only the necessary partial action required for its specific coverage enhancement level, optimizing resource allocation efficiency.
Data Source
AI summary
A method for a node used for wireless communication and an apparatus are provided. The method includes: transmitting X1 first random access preambles, wherein X1 is a positive integer; monitoring control signaling of a first random access response during a first time window, wherein the first random access response corresponds to the X1 first random access preambles; based on a result of the monitoring control signaling, incrementing a counter by 1; and transmitting X2 second random access preambles, wherein X2 is a positive integer greater than or equal to X1, wherein X2 is determined based on a first parameter and whether the counter is greater than a threshold, wherein the threshold is a positive integer.