244 results about "Congestion detection" patented technology

A codec detects congestion in a packet network and responds via a session control protocol to re-negotiate codec-type and / or parameters with the receiving codec to reduce bit rate for supporting a session. Once the connection and session are established, encoded packets start flowing between the two codecs. A control entity sends and receives network congestion control packets periodically in the session. The congestion control packets provide a "heartbeat" signal to the receiving codec. When the network is not congested, all "heartbeat" packets will be passed through the network As network congestion increases, routers within the network discard excess packets to prevent network failure. The codecs respond to the missing packets by slowing down the bit rate or proceeding to renegotiate a lower bit rate via the session control protocol. If there are no missing packets, the codecs detect if the session is operating at the highest bit rate, and if not, re-negotiate a higher bit rate.

Congestion in a radio access network (RAN) associated with transporting uplink information originating from one or more mobile terminals is detected. That detected RAN congestion is reduced using any suitable technique (several examples are described) and may be implemented in one or more nodes in the RAN. One advantageous (but non-limiting) application is to a RAN that supports high speed uplink packet access (HSUPA) and / or one or more enhanced uplink dedicated channels (E-DCHs).

Prioritized random access methods are proposed. According to an embodiment, random access attempts are classified into the priority levels according to delay requirements, and adedicated random access opportunities are reserved for different priority levels. A congestion detecting mechanism is introduced for such dedicated ranging (random access) opportunities. When congestion is detected by the base station, parameters or configurations of random access can be dynamically or temporarily modified through random access response message. Furthermore, a prioritized contention resolution is introduced to guarantee a high priority access is processed earlier than a low priority access. According to another embodiment, another prioritized contention resolution is introduced to reduce the impact of random access of a low priority M2M device upon H2H traffic.

An intelligent congestion feedback apparatus and method thereof includes a source endpoint transmitting data packets, and a destination endpoint receiving the data packets, and a timer in the destination endpoint set to zero. An intermediate node detects congestion between the source endpoint and the destination endpoint. Upon congestion detection, the intermediate node marks the data packets transmitted to the destination endpoint indicative of congestion. Upon receipt of the marked data packets, the timer begins reverse counting from a preset time value to zero and a feedback loop is turned-on between the destination endpoint and the source endpoint to transmit congestion notification (CN) messages to the source endpoint contributing to the congestion.

The invention discloses method and device for controlling congestion of an Ethernet. The method comprises the following steps of: closing an ingress port of core network equipment with the function of congestion detection to trigger a flow control PFC (Power Factor Correction) mechanism based on priority through a threshold; detecting whether a message forwarded by the ingress port is a CNM (Congestion Notification Message) or not; generating a PFC message according to the CNM if the message forwarded by the ingress port is the CNM; and forwarding the CNM through the ingress port and notifying the opposite-end equipment of suspending the data transfer of a corresponding queue according to the PFC message. With the technical scheme of the invention, the congestion problem can be quickly and effectively solved fundamentally.

An intelligent fabric congestion control apparatus and method are provided to receive data packets from source endpoints and output the data packets to destination endpoints. The apparatus and method include a counter, a timer, and a controller. The counter increments from a preset value when a data packet is received at an egress queue and decrements when the data packet is output from the egress queue. The timer starts timing in response to the incrementing of the counter from the preset value. The controller performs one of resetting the timer when the counter is decremented to the preset value prior to the timer reaching a first threshold, and detecting a persistent congestion when the timer reaches the first threshold.

Systems and methods described herein are directed to solutions for NoC interconnects that provide congestion avoidance and end-to-end uniform and weighted-fair allocation of resource bandwidths among various contenders in a mesh or torus interconnect. The example implementations are fully distributed and involve using explicit congestion notification messages or local congestion identification for congestion detection. Based on the congestion level detected, the injection rates of traffic at various agents are regulated that avoids congestion and also provides end-to-end QoS. Alternative example implementations may also utilize end-to-end credit based flow control between communicating agents for resource and bandwidth allocation of the destination between the contending sources. The resource allocation is performed so that both the weighted and strict bandwidth allocation QoS policies are satisfied.

A data flow control method and system within a data switch. The data switch includes a plurality of input sections each having an associated input buffer and each transmitting data to an output section. In response to a detection of congestion within the output section, data transmissions from the plurality of input sections to the output section are paused. Input buffer occupancies of each of the input sections are then determined. Thereafter, and in response to a backpressure relief signal, the restart of said data transmission from each of the input sections to the output section is delayed in inverse proportion to each of the determined input buffer occupancies.

The invention discloses a collaborative work congestion control method in the high-speed network, the transmitter detects the RTT delay information and 1-bit prediction information from the router to determine the network congestion status and the congestion window is the self-adapted and adjustable. The method of the invention combines the load factor of the network path and number of the data packets in the buffers of all routers connected in the path to adjust the congestion window of the high-speed network which can effectively adapt to the transfer characteristic of the high-speed network to guarantee the better link utilization rate of the network, friendly TCP and fair of the streaming. These two congestion information mechanisms can be fused to avoid the mistaken determination of single congestion detection mode under certain environment and reduce the direct influences of the unilateral information error on the reliability of the method.

Congestion in a radio access network (RAN) associated with transporting uplink information originating from one or more mobile terminals is detected. That detected RAN congestion is reduced using any suitable technique (several examples are described) and may be implemented in one or more nodes in the RAN. One advantageous (but non-limiting) application is to a RAN that supports high speed uplink packet access (HSUPA) and / or one or more enhanced uplink dedicated channels (E-DCHs).

A method and apparatus for congestion control for acknowledged communication over networks detects congestion based on trends of flight size and transmission rate in order to adapt a congestion window in accordance with a detection result. Such congestion detection enables, for example, distinguishing between the congestion with or without unfair competition. Moreover, the measured transmission rate or its trend can be filtered to compensate for time variations. An end node or a proxy can be used for congestion control.

A codec detects congestion in a packet network and responds via a session control protocol to re-negotiate codec-type and / or parameters with the receiving codec to reduce bit rate for supporting a session. Once the connection and session are established, encoded packets start flowing between the two codecs. A control entity sends and receives network congestion control packets periodically in the session. The congestion control packets provide a “heartbeat” signal to the receiving codec. When the network is not congested, all “heartbeat” packets will be passed through the network As network congestion increases, routers within the network discard excess packets to prevent network failure. The codecs respond to the missing packets by slowing down the bit rate or proceeding to renegotiate a lower bit rate via the session control protocol. If there are no missing packets, the codecs detect if the session is operating at the highest bit rate, and if not, re-negotiate a higher bit rate.

A system and method for client network congestion analysis and management is disclosed. According to one embodiment, the method includes: collecting real-time network data; executing calculations on the real-time network data to compute performance metrics; detecting peak usage time; and detecting one or more congestion incidents, wherein a congestion incident comprises a persistence of one or more metrics over a time window that comprises detecting a proportion of metric values crossing a threshold that exceeds a defined percentage amount, detecting a time-ordered stretch of metric values that exceeds a defined threshold, or combinations thereof.

A transmission terminal has a plurality of congestion control units (RPs) each controlling a frame transmission rate. A switch arranged between the transmission terminal and a reception terminal has a plurality of congestion detection units (CPs) each generating a congestion information notification frame addressed to the transmission terminal. A plurality of routes exist between the transmission terminal and the reception terminal. The management computer manages a correspondence relationship between the routes and the RPs, assigns any of the routes to a flow, selects a RP associated with a route assigned to the flow, and notifies the transmission terminal and the switch of the flow and the selected RP. When the switch receives a frame belonging to the flow, a CP associated with the selected RP generates the congestion information notification frame addressed to the selected RP. The transmission terminal transmits a frame belonging to the flow through the selected RP.

A flow control system include a congestion detecting section and control section. The congestion detecting section detects congestion in a packet switching network. The control section is arranged in a transmitting node. When the congestion detecting section detects congestion, the control section calculates a new transmission packet rate. When the new transmission packet rate is smaller than a current transmission packet rate, the control section changes the current transmission packet rate to the new transmission packet rate after transmission of data to be transmitted to a receiving node. A flow control method is also disclosed.

The invention relates to a method and a system for preventing message congestion. The system comprises a processor, which is connected with a traffic manager and used for completing message classification, parsing, modification and encapsulation. Congestion processing is carried out according to the received congestion strategy sent by the traffic manager. The traffic manager is used for the detection of message congestion and the generation of the congestion strategy and used for sending the congestion strategy to a packet processor. According to the method and the system of the invention, the message processing performance and efficiency are improved.

Congestion control techniques based upon resource utilization information stored by a network device. According to an embodiment of the present invention, a network device is configured to identify a data source causing congestion based upon information stored by the network device identifying a set of data sources, and for each data source, information identifying the amount of a resource of the network device being used for processing data received by the network device from the data source.

The invention relates to a GPS (Global Position System) based traffic flow and road jamming detection system, comprising vehicle-mounted terminals arranged on monitoring vehicles, a server used for receiving information of the vehicle-mounted terminals and carrying out congestion calculation, wherein the vehicle-mounted terminals are in communication connection with the server through a wireless communication network, and each vehicle-mounted terminal comprises a GPS module, a first communication module, a display module and an information processing module; the server comprise a congestion state calculation module and is used for acquiring real-time traffic information through a congestion function according to coordinate information sent back by different vehicle-mounted terminals, and the congestion function is adopted for calculating congestion degrees of different rod sections, if the congestion degree is larger than a preset congestion degree threshold, a congestion state is judged to be, and otherwise, a smooth state is judged to be; and a second communication module is used for sending traffic states of different road sections to the vehicle-mounted terminals. The invention has the advantages of low cost, strong practicability and easy popularization.

The invention discloses a method, a device and a system for detection and early warning of vehicle congestion. The method comprises steps: vehicle part information in a congestion detection area in a lane corresponding to an intelligent camera in each direction of an intersection and vehicle information in a congestion early warning area are acquired; according to the vehicle part information in the congestion detection area in the corresponding lane and the vehicle information in the congestion early warning area, the vehicle driving state in the congestion detection area in the corresponding lane is judged, and a judgment result is outputted; and the judgment result is comprehensively analyzed and processed, and then the congestion early warning information is sent to a display screen in each direction of the intersection. Through comprehensively analyzing the vehicle part information in the congestion detection area and the vehicle information in the congestion early warning area, the vehicle driving state can be judged more accurately, and through sending the congestion early warning information to the display screen in each direction of the intersection, the congestion state can be fully known in each direction of the intersection, and the congestion time is thus reduced.

In a peer-to-peer asymmetric communication environment, an adaptive upload Data Rate Control element—called Adaptive-DRC—is used to detect increase in data return-trip time (RTT) caused by the congestion associated with the uploading of data in an uplink which in turn impacts on downloading data on an associated downlink, namely a downlink sharing resources with the uplink. Using Adaptive-DRC, the congestion is detected and thereupon adjustments to are made to allow continued communication. Adaptive-DRC comprises: (i) RTT estimation; (ii) detection of the onset of congestion, herein pre-congestion detection; and (iii) adaptation of the upload data rate limit. Two specific embodiments are contemplated, namely two versions of Adaptive-DRC wherein the difference lies in the upload data rate limit adaptation technique.

Systems and methods described herein are directed to solutions for NoC interconnects that provide congestion avoidance and end-to-end uniform and weighted-fair allocation of resource bandwidths among various contenders in a mesh or torus interconnect. The example implementations are fully distributed and involve using explicit congestion notification messages or local congestion identification for congestion detection. Based on the congestion level detected, the injection rates of traffic at various agents are regulated that avoids congestion and also provides end-to-end QoS. Alternative example implementations may also utilize end-to-end credit based flow control between communicating agents for resource and bandwidth allocation of the destination between the contending sources. The resource allocation is performed so that both the weighted and strict bandwidth allocation QoS policies are satisfied.

The invention discloses an intelligent re-routing method and device based on congestion sensing in a software-defined network. The method comprises the following steps: a network monitoring module ofa control layer collects and computes a network state of a data layer at fixed time after the initialization; a congestion detection module of the control layer performs fuzzy evaluation on two indexes of link used load ratio and link load change rate so as to obtain a fuzzy evaluation value of the current link congestion quality, and obtaining the congestion quality fuzzy evaluation value of thispath according to the average congestion degree of all links on the path; after the congestion detection module of the control layer accomplishes the congestion quality evaluation of all alternativepaths, a path selection module and the congestion detection module establish connection with the network monitoring module to acquire a path selecting parameter, thereby selecting the optimal path ofthe data stream transmission. The invention provides an intelligent congestion-avoidance routing selection method for the data stream in the network, and the network performance and the user quality of service experience are effectively improved.

The invention is applicable to the field of data communication and provides a method and a system for network congestion management. The network comprises a core network entity with a congestion detection function and an upstream network entity capable of responding to congestion notification information. The invention is characterized in that the method comprises the following steps: the core network entity sends the congestion notification information to the upstream network entity when detecting the congestion situation; the upstream network entity reduces the data transmission rate by a certain step value according to the received congestion message information and resets a timer or a counter for counting the number of data packets; and the timer or the counter triggers the upstream network entity to enter a rate recovery stage when overflows. When the timer or the counter overflows, the upstream network entity increases the data transmission rate and reduces the waste of the network bandwidth.

A system and method for client network congestion analysis and management is disclosed. According to one embodiment, the method includes: collecting real-time network data; executing calculations on the real-time network data to compute performance metrics; detecting peak usage time; and detecting one or more congestion incidents, wherein a congestion incident comprises a persistence of one or more metrics over a time window that comprises detecting a proportion of metric values crossing a threshold that exceeds a defined percentage amount, detecting a time-ordered stretch of metric values that exceeds a defined threshold, or combinations thereof.

The invention provides a vehicle number and traffic flow speed based highway congestion detection method. The method comprises the steps of making statistics on a vehicle number; calculating a traffic flow speed; and according to the vehicle number and the traffic flow speed, judging a highway congestion state. According to the method, non vehicle characteristic points are not generated, most errors can be avoided, and only a certain vehicle (less than or equal to a threshold N) region is selected, so that the calculation amount is greatly reduced; and based on a TIDM8127 camera platform, the test rate of a 352x288 cif video reaches 15fps (frame per second), so that real-time accurate detection is realized.

The invention relates to a method for guaranteeing Ad Hoc network MAC layer QoS on the basis of IEEE802.16. The method comprises a resource scheduling method, a reserving method and a congestion detecting method according to the characteristics of an Ad Hoc network and on the basis of MAC layer QoS guarantee frame under an IEEE802.16 Mesh mode. The resource scheduling method which is designed by the invention takes the influence of a multi-hop network on real time service delay into account, the priority level of real time services is improved, and the refused possibility of the real time services due to overtime transmission is reduced. The method dynamically changes the resource reservation step-length according to the service request conditions and solves the problems that an original DSA algorism changes resource reservation with fixed step-length and service demands can not be satisfied in time, thereby increasing the slot efficiency. The adoption of the congestion detecting method enables an authorized node to detect the congestion states of the network in time, and certain measures can be adopted.

Congestion information is determined based on a file segment transferred to one of user terminals. The congestion information is available to a server or controller communicatively linked with a plurality of user terminals. The congestion information is shared with other user terminals that share a bottleneck link.

The system thereof comprises a communication control module and one or more multi media processing modules connected to the said communication control module through management control interface. The multi media processing module comprises a packet transceiver and a congestion detection module. The communication module comprises a congestion state management module and a calibration operation module. The method thereof includes: determining the traffic flow direction required by the communication service; accessing the congestion management module to get the congestion state information about the traffic flow; in term of predetermined strategy and congestion level information, executing, admitting or refusing the operation of communication service.

In a congestion control system for congestion controlling communications on a network, a congestion control node has a congestion detection part for detecting a congestion level of the communications in the congestion control node in question and a congestion notifying part for notifying other congestion control nodes on the network of congestion information detected by the congestion detection part. The congestion control node further has a part for receiving the congestion information from the other congestion control nodes and a congestion flow estimating part for estimating, with reference to the congestion information and a routing table for designating a transfer path to destination, a flow having the congestion level that is not less than a predetermined level in the transfer path to the destination.