Transmission Format Selection for Delay-Sensitive Traffic
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Solution Overview
Problem
Current scheduling systems in wireless communications are unable to maintain the necessary quality of service for delay-sensitive traffic, leading to packet loss and user outage due to excessive latency, as they are primarily designed for throughput optimization rather than delay reduction.
Innovation Solution
A method and apparatus that select a transmission format with a smaller payload size based on a data rate control index received from a mobile station, reducing the number of time slots needed for data transmission and allowing early termination of data transmission using hybrid automatic repeat request, thereby minimizing delay and packet loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current scheduling systems use throughput optimization, then system capacity is improved, but delay-sensitive traffic quality deteriorates
Solution Approach 1:
The system dynamically adjusts transmission format selection based on traffic type and channel conditions. For delay-sensitive traffic, the scheduler selectively chooses transmission formats with smaller payload sizes to reduce queuing delay, while for non-delay-sensitive traffic, it uses larger payload sizes to maximize throughput. This dynamic adaptation resolves the contradiction between throughput optimization and delay-sensitive service quality.
Solution Approach 2:
The invention changes the transmission format parameters (specifically payload size) based on the traffic characteristics and channel conditions. By selecting from multiple available transmission formats with different payload sizes, the system can optimize for either throughput or delay depending on the traffic type, thereby resolving the contradiction between system capacity and service quality for different traffic categories.
2Productivity
If packets are transmitted with larger payload size, then transmission efficiency is improved, but latency increases
Solution Approach 1:
The transmission format selection is dynamically adjusted based on the packet type and channel conditions. For delay-sensitive packets, the system selects formats with smaller payload sizes to reduce transmission time and latency, while for non-delay-sensitive packets, it uses larger payload sizes to improve transmission efficiency. This dynamic parameter adjustment resolves the contradiction between transmission efficiency and latency.
3Speed
If transmission format with largest compatible payload size is used, then data rate is improved, but packet loss increases
Solution Approach 1:
The system changes the transmission format parameters based on channel conditions and traffic requirements. When channel conditions are poor or for delay-sensitive traffic, the system selects transmission formats with smaller payload sizes to ensure reliable delivery within delay bounds, reducing packet loss. When channel conditions are good and for non-delay-sensitive traffic, it uses larger payload sizes to maximize data rate, thus resolving the contradiction between data rate and packet delivery reliability.
Data Source
AI summary
A method, scheduler, and processor program product for scheduling transmission of packets from a base station to a mobile station. A data rate control index is received from a mobile station. A transmission format is selected using the received data rate control index. The selected transmission format uses a payload size that is smaller than a largest compatible payload size for another transmission format corresponding to the received data rate control index and that is smaller than a total size of packets waiting to be transmitted.