Access Node Transmission Scheduling via Dynamic BLER Adjustment
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Solution Overview
Problem
In telecommunication systems, high load and poor channel conditions due to data transmission errors, interference, and packet loss lead to increased queuing delay and congestion, affecting the efficiency of communication links and user service quality.
Innovation Solution
Implementing a method where an access node determines an aggregated queuing delay and modifies the target Block Error Rate (BLER) based on the number of data packets and queuing delay, dynamically adjusting the modulation and coding scheme to optimize transmission and reduce congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data packets are transmitted under high load conditions, then throughput is maintained, but queuing delay increases and service quality deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of the target BLER parameter based on real-time queuing delay measurements. When queuing delay exceeds a threshold, the system modifies the target BLER to be more conservative, which changes the transmission strategy to reduce buffer occupancy and thereby reduce queuing delay while maintaining acceptable throughput
Solution Approach 2:
The system continuously monitors queuing delay and uses this feedback to adjust the target BLER parameter. This closed-loop control mechanism allows the system to respond to changing load conditions and automatically optimize the trade-off between throughput and delay
2Productivity
If aggressive transmission strategies are used to maintain high bearer utilization, then link utilization improves, but congestion and packet loss increase
Solution Approach 1:
The system monitors packet loss and congestion indicators to dynamically adjust the target BLER. When packet loss exceeds thresholds or congestion is detected, the system modifies the target BLER to be more conservative, reducing the aggressiveness of transmission and thereby reducing packet loss while maintaining reasonable bearer utilization
Solution Approach 2:
The patent changes the target BLER parameter dynamically based on network conditions. By adjusting this key transmission parameter, the system can shift between aggressive and conservative transmission strategies to optimize the balance between bearer utilization and packet loss
3Reliability
If the target BLER is kept low to reduce errors, then transmission reliability improves, but transmission efficiency and throughput decrease
Solution Approach 1:
The system dynamically adjusts the target BLER based on current network conditions including queuing delay and packet loss. Instead of using a fixed conservative value, the system adapts the target BLER to be more aggressive when conditions permit and more conservative when conditions deteriorate, optimizing the trade-off between reliability and efficiency
Solution Approach 2:
The patent implements dynamic parameter changes to the target BLER based on measured network performance. This allows the system to optimize transmission efficiency by using higher target BLER values when conditions allow, while maintaining reliability by reducing target BLER when errors are detected
Data Source
AI summary
Systems and methods are described for scheduling transmissions from an access node in a communication network. A plurality of data packets may be received at a buffer of an access node. A discard timer may be started on receipt of the data packets. When the discard packet timer expires, a number of data packets in the buffer and an associated aggregated queuing delay may be determined. The aggregated queuing delay may be compared to target block error rate (BLER). The target BLER may be modified when the aggregated queuing delay and the number of data packets exceed a target threshold. Data packets may be transmitted from the access node using the modified BLER.