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sarahlancaster
Network Novice
Joined 3 months ago
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Internal Routing different? Is it causing latency increases/decreases?
Lower latency fluctuations,which is great, occurring once or twice a week across the same or different bands (e.g., n71, n41, B2, B66) at the same location and cell sector—analyze RSRP, SINR, RSRQ, BLER, NR_ARFCN, NR_SSB Index, and NR Tx Power to determine potential causes by comparing what's occurring between lower and higher latency times. No pattern was detected and none of these are found to be the culprit A traceroute shows that the internal backbone is dynamically changing, which appears to be the primary factor affecting latency. While different bands impact latency, the most significant variations stem from changes within the internal backbone. The second to fifth hop in the traceroute (192.0.0.1) is where latency increases by 30-50ms across different bands. Band changes from n71 to n41 show varying latency depending on whether 192.0.0.1 changes. For instance, if n71 initially has 70ms latency, it may drop to 40ms when something changes internally. Restarting the phone after this change also reduces latency across other bands (B2, n41, B66) by 30-40ms, indicating that latency improvements are not solely due to band selection. For example, if n41 was at 90ms, it may drop to 58ms after an internal backbone adjustment, confirming that network backbone routing plays a major role. This occurs across all devices, including my T-Mobile Home Internet. Whatever the optimal route is, that’s the one I want to be permanently on. Not only is latency lower, but download speeds nearly reach 200Mbps compared to around 100Mbps. I should note that the time of day is irrelevant, despite any assumptions that this might be a coincidence caused by congestion. This occurs at all times—early mornings, peak hours, and late at night. The optimal route can remain for a few hours to up to two days before reverting to the usual higher-latency route which can last two weeks. If the argument is that I’m being temporarily routed through a more optimal path due to congestion, that’s a possibility. However, what’s not in question is that congestion itself is causing higher or lower latency in this scenario. Is there anyway to get on this optimal route or bring attention to higher level techs?101Views0likes0Comments