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AT&T Algorithm During each Measurement Interval, Core Proxy estimates: Mean processing rate mt , Queue length at end of measurement interval qt, Core Proxy calculates the retry after period as the time needed for Core Proxy to process the queued messages that exceed the target queueing delay: Retry-after-delay = qt/mt - a x de Retry-after-delay updated each Control Interval and distributed to Edge Proxies in 503 responses, |