Artificial RTT Delay for Multi-Access Network Congestion
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Solution Overview
Problem
In multi-access communication networks, the management of Round Trip Time (RTT) is challenging due to resource sharing among multiple client devices, leading to potential overloading and increased retransmissions, especially in burst data transmissions, which can result in deteriorated performance and quality of service.
Innovation Solution
Introducing an artificial delay in the RTT to extend the Retransmission TimeOut (RTO) or Probe TimeOut (PTO), allowing for longer idle times between data bursts without causing retransmissions, thereby optimizing resource utilization and reducing congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data flow is transmitted using shared network resources in multi-access communication networks, then resource utilization is improved, but network overload and retransmissions increase
Solution Approach 1:
The patent applies preliminary action by extending the Retransmission TimeOut (RTO) or Probe TimeOut (PTO) before actual data transmission occurs. This is achieved by introducing an artificial delay in the Round Trip Time (RTT) measurement, which proactively increases the timeout period to accommodate potential network congestion and resource sharing delays, thereby preventing retransmissions before they occur
Solution Approach 2:
The patent changes the time parameter by artificially increasing the RTT value through an introduced delay. This parameter change directly affects the RTO/PTO calculation, transforming it from a standard timeout value to an extended timeout that accounts for the additional artificial delay, thereby aligning the timeout period with the actual extended transmission time
2Reliability
If Retransmission TimeOut (RTO) or Probe TimeOut (PTO) is extended to allow longer idle times between data bursts, then retransmissions are reduced, but data transmission speed decreases
Solution Approach 1:
The patent converts the harmful effect of extended timeout (which normally reduces transmission speed) into a benefit by showing that the artificial RTT delay, while extending RTO/PTO, actually improves overall system performance by eliminating retransmissions. The artificial delay harmfully extends timeout but beneficially prevents retransmissions, and the net effect is improved resource utilization and quality of service
3Productivity
If artificial delay is introduced in RTT to extend RTO/PTO, then resource utilization is improved, but RTT measurement accuracy deteriorates
Solution Approach 1:
The patent segments the RTT measurement concept into two distinct components: the actual network RTT (for quality assessment) and the artificial delay RTT (for timeout extension). This segmentation allows the system to use the artificial delay specifically for extending RTO/PTO calculations while maintaining separate tracking of actual network conditions, thereby preserving measurement accuracy for monitoring purposes while achieving timeout extension for performance improvement
Data Source
AI summary
Methods and device(s) (110; 120; 130; 140; 141; 210; 212; 220; 230; 600) for managing Round Trip Time, RTT, associated with provision of a data flow (150; 250) from a server device (130; 230), via a multi-access communication network (100; 200), to a client device (120; 220). Said device(s) (110; 120; 130; 140; 141; 210; 212; 220; 230; 600) being communicatively connected to the multi-access communication network (100; 200) that is configured to provide the data flow (150; 250) to the client device (120; 220) using a resource of the multi-access communication network (100; 200) that is shared by multiple devices (120-121; 220-221). The device(s) (110; 120; 130; 140; 141; 210; 212; 220; 230; 600) initiates, in response to identification that the data flow (150; 250) belongs to a certain type, introduction of an artificial delay in the RTT.