In our testing, one thing worth noticing is that for different sim cards, the uplink/downlink ratio can be quite different. For example, with a China Mobile 4G card, we measured a downlink at 35Mbps and an uplink at 3Mbps, while with a China Telecom 4G card, we measured a downlink at 45Mbps and an uplink at 23Mbps at the same time in the same spot.
If we want to measure RTT more precisely, we let ACK return from the same path. However, because some sim cards are more asymmetrical than the others, it introduced a question, do we want ack frequency control per path?
In the QUIC ack-frequency draft, one of the motivations is to handle link asymmetry such that the link throughput won't be constraint by ack packets in the reverse direction. My understanding is that some 5G IoT cards can be more asymmetrical, so do we want to add a mechanism to address this issue? What do you think?
In our testing, one thing worth noticing is that for different sim cards, the uplink/downlink ratio can be quite different. For example, with a China Mobile 4G card, we measured a downlink at 35Mbps and an uplink at 3Mbps, while with a China Telecom 4G card, we measured a downlink at 45Mbps and an uplink at 23Mbps at the same time in the same spot.
If we want to measure RTT more precisely, we let ACK return from the same path. However, because some sim cards are more asymmetrical than the others, it introduced a question, do we want ack frequency control per path?
In the QUIC ack-frequency draft, one of the motivations is to handle link asymmetry such that the link throughput won't be constraint by ack packets in the reverse direction. My understanding is that some 5G IoT cards can be more asymmetrical, so do we want to add a mechanism to address this issue? What do you think?