Adaptive Random Access Response Code Rate Optimization
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Solution Overview
Problem
Existing telecommunications systems, such as those in 3GPP specifications for LTE and 5G, use a static code rate for random access response (RAR) messages, which does not adapt to varying radio frequency conditions, leading to inefficient resource utilization.
Innovation Solution
A method and system for adaptively optimizing the code rate of RAR messages based on cell statistics over time, by determining the success rate of connection attempts and updating parameters to adjust the code rate accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a static code rate is used for RAR messages, then the system is simple to implement, but the resource utilization efficiency deteriorates under varying radio frequency conditions
Solution Approach 1:
The patent implements dynamic code rate adjustment by transitioning from a fixed predetermined code rate to a variable code rate that adapts to changing radio frequency conditions. The gNB monitors connection attempt success rates and dynamically selects appropriate code rates for RAR messages, allowing the system to optimize resource utilization efficiency while maintaining implementation feasibility through structured adaptation mechanisms.
Solution Approach 2:
The patent changes the code rate parameter based on observed connection attempt success rates. By monitoring whether UEs successfully decode RAR messages and adjusting the code rate accordingly (increasing for high success rates, decreasing for low success rates), the system optimizes resource utilization without requiring complete system redesign, thus resolving the contradiction between simplicity and efficiency.
2Speed
If a higher code rate is used, then the transmission speed increases, but the reliability of message delivery deteriorates in poor radio frequency conditions
Solution Approach 1:
The patent dynamically adjusts the code rate parameter based on measured connection attempt success rates. When success rates indicate good radio frequency conditions, higher code rates are used to increase transmission speed. When success rates decline, indicating poor conditions, the code rate is reduced to maintain message delivery reliability. This adaptive parameter change resolves the contradiction between speed and reliability.
Solution Approach 2:
The system implements feedback by monitoring whether UEs successfully receive and acknowledge RAR messages. Based on this feedback, the gNB adjusts the code rate for subsequent RAR transmissions. This closed-loop control ensures that transmission speed is optimized when conditions permit while maintaining reliability when conditions deteriorate, resolving the speed-reliability contradiction.
3Reliability
If a lower code rate is used, then the message delivery reliability improves, but the resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements dynamic code rate adjustment that increases the code rate when connection attempt success rates indicate good radio frequency conditions, thereby improving resource utilization efficiency. When success rates decline, the code rate is reduced to maintain reliability. This adaptive approach resolves the contradiction by using lower code rates only when necessary for reliability while maximizing efficiency when conditions allow.
Solution Approach 2:
The system transitions from a static low code rate to a dynamic code rate that adapts to current radio frequency conditions. By monitoring connection attempt outcomes and adjusting the code rate accordingly, the system maintains reliability when needed while improving resource utilization efficiency when conditions permit, thus resolving the contradiction between reliability and productivity.
Data Source
AI summary
A method for adaptively optimizing a random access response (RAR) message by a radio access network (RAN) node includes: determining a first number of connection attempts over a first time duration that are received from one or more user equipment (UE); determining a success rate for the first number of connection attempts; updating one or more parameters to adjust a code rate used for generating communication messages to the one or more UEs, from a first code rate to a second code rate, based at least in part on the success rate; generating the RAR message using the second code rate, in response to receiving an initial access connection request message from a first UE among the one or more UEs; sending the RAR message based at least in part on the second code rate to the first UE.