PRACH Retransmission Control Using Counter Thresholds
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Solution Overview
Problem
Increasing the number of PRACH transmissions for retransmissions in communication systems consumes additional time-frequency resources and increases collision probability, necessitating a balance between resource consumption and random access effectiveness.
Innovation Solution
A method and device for wireless communication nodes that manage PRACH retransmissions by adjusting the number of preambles based on counter thresholds, determining whether to transmit additional preambles based on the relationship between counter values and configured thresholds, thereby optimizing resource use and reducing delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of PRACH transmissions is increased for retransmissions, then the coverage performance and reliability of random access is improved, but the time-frequency resource consumption and collision probability increase
Solution Approach 1:
The patent implements dynamic adjustment of the number of PRACH transmissions based on counter values and thresholds. The network device configures multiple counters (first counter for total transmissions, second counter for retransmissions) and thresholds that dynamically control transmission behavior. When counters reach thresholds, the system adjusts transmission parameters or switches to alternative access methods, optimizing resource usage while maintaining coverage performance.
Solution Approach 2:
The system changes transmission parameters dynamically by adjusting the number of preambles transmitted in retransmissions based on counter values. Different parameter sets (X1 preambles initially, X2 preambles in retransmissions where X2 >= X1) are configured based on channel conditions and access success rates, allowing optimization between coverage and resource consumption.
2Reliability
If the number of PRACH transmissions is increased for retransmissions, then the coverage performance of random access is improved, but the collision probability of PRACH preambles increases
Solution Approach 1:
The patent implements dynamic adjustment of the number of PRACH transmissions based on counter values and thresholds. The network device configures multiple counters (first counter for total transmissions, second counter for retransmissions) and thresholds that dynamically control transmission behavior. When counters reach thresholds, the system adjusts transmission parameters or switches to alternative access methods, optimizing resource usage while maintaining coverage performance.
Solution Approach 2:
The system transmits X2 preambles in retransmissions where X2 is greater than or equal to X1, allowing partial increase in transmission attempts to improve coverage while avoiding excessive transmissions that would guarantee high collision probability. The counter-threshold mechanism ensures transmissions are increased only to the extent needed for coverage enhancement.
3Productivity
If multiple PRACH retransmissions are performed with increased preambles, then the random access effectiveness is improved, but the resource allocation complexity increases
Solution Approach 1:
The patent segments the random access process into distinct phases controlled by different counters: the first counter manages total transmission attempts across all retransmissions, while the second counter specifically tracks retransmission attempts. This segmentation allows independent control and optimization of each phase, simplifying resource allocation decisions.
Solution Approach 2:
The system employs feedback mechanisms where the network device monitors counter values and adjusts resource allocation accordingly. When the first counter reaches the first threshold or the second counter reaches the second threshold, the system receives feedback and adjusts transmission parameters or switches to alternative access methods, enabling adaptive resource management.
Data Source
AI summary
A method and device for use in nodes for wireless is provided. One example method includes: transmitting, by a first node, X1 first random access (RA) preambles, X1 being a positive integer greater than 1; monitoring a control signaling for a first random access response (RAR) during a first time-window, wherein the first RAR corresponds to the X1 first RA preambles; updating a current value of a first counter to obtain an updated value of the first counter when reception of the first RAR is not successful while the first time-window expires; and transmitting X2 second RA preambles in response to the updated value of the first counter being less than the first threshold, wherein X2 is a positive integer greater than or equal to X1; or dropping transmission of X2 second RA preambles in response to the updated value of the first counter being greater than the first threshold.