摘要:
A method and an apparatus for reducing packet loss for a packet data service during congestion in a transport network are provided. The method comprises measuring a packet loss rate over a time period in one or more flows of data traffic packets associated with the packet data service to determine whether the one or more flows of data traffic packets are experiencing a variation in a desired traffic performance level at a particular time duration during the congestion in the time period. The method further comprises triggering a request to reduce a flow rate of at least one of the one or more flows of data traffic packets based on the packet loss rate if the at least one of the one or more flows of data traffic packets experiences the variation in the desired traffic performance level. By using a distributed transport congestion control, for example, only such Best Effort data traffic packet flows that generate bursty traffic at a specific moment of congestion sense the congestion and thus trigger an associated rate reduction action. However, other flows that do not experience the congestion may not be affected.
摘要:
A method and an apparatus for maintaining a quality of service (QoS) for a multi-media packet data service in a transport network is provided. The method comprises determining a first packet loss indication for a first flow of QoS traffic packets. The method further comprises determining a second packet loss indication for a second flow of QoS traffic packets, wherein the determination of the first packet loss indication for the first flow of QoS traffic packets is independent from the determination of the second packet loss indication for the second flow of QoS traffic packets. The method further comprises determining whether to drop the first flow of QoS traffic packets based on the first packet loss indication or to drop the second flow of QoS traffic packets based on the second packet loss indication. By using per-flow independent packet loss statistics to determine whether that flow should be dropped and gradually dropping such QoS flows having the most impact on a desired QoS performance, a reduced number of QoS flows may be dropped to recover a data transport network from congestion.
摘要:
A submersible data center (180, 180a, 180b) configured in a water-tight capsule for deployment in a body of water. The data center capsules (180, 180a, 180b) are mounted on a submersible platform (110) of an elevator apparatus (100, 100a), which is equipped with a support leg (130a) or support legs (130) and winches (132) are located near a top of the support leg or each of the support legs. The data center capsules (180, 180a, 180b) can be submerged underwater for operation or be winched up above the water for retrieval/maintenance. A first-time deployment of the support leg(s) (130, 130a) is provided by leg-lowering winches (112) located on the submersible platform (110). Heat exchangers (190) or chillers (190a) are used, or a centralized chiller (190b) is used, to dissipate heat energy from inside the data center capsules (180, 180a, 180b) to the surrounding water. Accompanying methods of operations are also described.
摘要:
In a method for fabricating a carbon nanotube (CNT) composite, an array of CNTs is provided. A CNT ribbon is pulled from the array and wound on a rotating mandrel. A polymer solution is applied to the ribbon to form a CNT composite laminate. The CNTs in the ribbon may be substantially aligned in a single direction. The ribbon may be attached to the mandrel such that the ribbon may be wound on the mandrel as the mandrel rotates. A CNT composite is provided that may include a polymer integrated with long, substantially straight CNTs that are highly aligned in a single direction. An apparatus for fabricating a CNT composite is provided that may include a rotatable mandrel and a spray gun. The spray gun may be configured for spraying a polymer solution on the CNT ribbon as the CNT ribbon is taken up on the rotating mandrel.