Radio Network Simulation Using Link-Level Curves
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Solution Overview
Problem
Existing simulation techniques for radio telecommunication networks, such as EGPRS, HSDPA, and HSUPA, struggle to model the physical level at a system level due to the need for correlating successive data packet transmissions and changing transport formats, which is computationally intensive and time-consuming.
Innovation Solution
The method involves using link-level simulation curves to estimate interferential conditions and average throughput, assuming loss-free transmission based on these conditions, thereby simplifying the system-level simulation by leveraging relationships between interferential measures and throughput, and accounting for HARQ retransmissions and transport format changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detailed loss checking and correlation of successive transmissions are performed at system level, then simulation accuracy is improved, but simulation time and complexity increase significantly
Solution Approach 1:
The patent segments the simulation task by separating link-level physical layer simulation from system-level simulation. Link-level curves pre-computed from detailed link-level simulations are then used at the system level to avoid redundant detailed simulations, achieving both accuracy and speedup.
Solution Approach 2:
The patent performs preliminary link-level simulations to generate curves that relate interferential conditions to throughput. These pre-computed curves are then reused in system-level simulations, avoiding the need to perform detailed loss checking during system-level simulation.
2Measurement precision
If HARQ retransmissions and transport format changes are modeled in detail, then simulation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent creates simplified copies of the complex physical layer behavior through link-level curves. These curves capture the essential relationship between interferential conditions and throughput, including the effects of HARQ retransmissions and transport format changes, without modeling them in detail at the system level.
Solution Approach 2:
The patent changes the level of detail by using aggregated parameters (throughput as a function of interferential conditions) instead of detailed transmission parameters. This parameter transformation simplifies the simulation while preserving accuracy.
3Productivity
If link-level simulation curves are used to estimate throughput, then simulation speed is improved, but simulation simplicity increases
Solution Approach 1:
The patent introduces link-level curves as intermediary elements that bridge the gap between detailed link-level physics and system-level simulation. These curves serve as a mediator that provides accurate throughput estimation without requiring detailed loss checking at the system level.
Data Source
AI summary
A method of simulating transmission of data from a transmitter to a receiver in a radio communications network, the method including calculating an average amount of data to be transmitted to the receiver in a considered transmission time interval based on a relationship between an interferential condition assumed to be experienced at the receiver and a data transmission throughput, the relationship being determined by a link-level simulation of the link between the transmitter and the receiver.