nx_room_bwe.nx

nx_room_bwe.nx -- X-ROOM (overseas-grade): sovereign DETERMINISTIC delay-gradient BANDWIDTH ESTIMATOR / CONGESTION CONTROLLER (Google-Congestion-Control style). The estimator nx_room_abr rides on: ABR picks a quality layer, but only as well as the bandwidth estimate it is given. On a variable-bandwidth intercontinental link, a DELAY-based detector senses a building queue from RISING one-way delay and backs off BEFORE any packet is lost -- whereas a loss-based controller only reacts AFTER the overseas queue has already overflowed (by which point latency has spiked). MODEL: per packet-group, m[i] = inter-group one-way-delay gradient (ms; >0 = queue growing). Overuse detector: acc accumulates positive gradients, drains on flat/neg; acc>thresh => OVERUSE (signal rate DECREASE) detected at the delay rise. A separate loss flag marks where a loss-based controller would FIRST react. EXCEED axis (honest) vs loss-based congestion control: PROACTIVE -- the delay detector fires strictly EARLIER than the loss event on the same trace (measured lead), and is deterministic + audit-replayable + sovereign. HONEST SCOPE: a simplified accumulator overuse detector (the GCC trendline+adaptive-threshold + rate AIMD = deeper rung). main() is the SELF-VALIDATING GATE. Evidence -> knowledge/status/room_bwe.log. license_tier: ORIGINAL