Dynamic HARQ Transmission Management in Random Access Procedures
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Solution Overview
Problem
Existing random access procedures in wireless communication systems inefficiently use radio resources, leading to unnecessary waste due to inadequate management and allocation, especially in scenarios where multiple users share resources without clear identification.
Innovation Solution
Implementing a method where a base station dynamically manages radio resources by setting a common and dedicated maximum number of Hybrid Automatic Repeat Request (HARQ) transmissions for all terminals, included in System Information Blocks, to optimize resource usage during random access procedures, particularly in contention-based scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If random access procedures are performed without dynamic HARQ transmission management, then the random access procedure can be completed, but radio resources are unnecessarily wasted
Solution Approach 1:
The patent applies dynamics by making the maximum number of HARQ transmissions configurable and terminal-specific rather than fixed. The base station dynamically sets the maxHARQ-Msg3Tx parameter for different terminals based on their channel conditions, buffer status, and traffic patterns, allowing the system to adapt transmission opportunities to actual needs and avoid unnecessary retransmissions that waste radio resources
Solution Approach 2:
The patent changes the parameter of maximum HARQ transmissions from a fixed system-wide value to a configurable terminal-specific value. By modifying this parameter dynamically for each terminal through RRC configuration, the system optimizes resource usage by allowing terminals with poor channel conditions to have more retransmission opportunities while limiting terminals with good conditions, thereby reducing overall radio resource waste
2Productivity
If a fixed maximum number of HARQ transmissions is configured for all terminals, then the system operation is simplified, but radio resource collisions increase and efficiency decreases
Solution Approach 1:
The patent applies local quality by assigning different maximum HARQ transmission values to different terminals based on their specific characteristics and channel conditions. Instead of a uniform configuration, each terminal receives a customized maxHARQ-Msg3Tx parameter that matches its local requirements, improving overall radio resource efficiency by preventing both excessive and insufficient retransmissions for different users
Solution Approach 2:
The patent implements preliminary action by pre-configuring the maximum HARQ transmission parameter for each terminal through RRC signaling before random access occurs. This advance configuration allows terminals to know their retransmission limits beforehand, enabling better local decision-making during random access procedures and reducing the need for complex real-time resource allocation management during contention periods
3Reliability
If terminals perform uplink transmissions without coordinated HARQ management, then transmission autonomy is maintained, but radio resource collisions occur frequently
Solution Approach 1:
The patent implements feedback by having the base station monitor terminal transmissions and send HARQ acknowledgments (ACK/NACK) to inform terminals whether their transmissions were successfully received. This feedback mechanism allows terminals to adjust their behavior based on actual reception status, improving uplink transmission reliability by enabling informed retransmission decisions while maintaining relatively simple terminal complexity through standardized feedback processing
Data Source
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AI summary
A mobile terminal and a method of performing a random access procedure by the terminal is achieved by transmitting a random access preamble to a base station, receiving a random access response from the base station, and performing an uplink transmission using an uplink grant from the base station. The uplink transmission is performed by using a maximum number of HARQ (Hybrid Automatic Repeat reQuest) transmissions parameter, which is included in a System Information Block (SIB) received from the base station.