189 results about "Stream Control Transmission Protocol" patented technology

Disclosed are methods and apparatus for reliably handling Stream Control Transmission Protocol (SCTP) multi-homed connections across multiple translation (e.g., NAT devices), such that messages sent between endpoints, which include one or more multi-homed devices, reach their intended destination. In one embodiment, a method for handling SCTP multi-homed connections across multiple translation devices is disclosed. When an SCTP association between two hosts is being established through a particular translation device, multi-homing information for one or both of the hosts is communicated from the particular translation device to one or more other translation devices which are associated with the particular translation device. This is done so that the one or more other translation devices can store the received multi-homing information and when data is received at the one or more translation devices for the established SCTP association between the two hosts, the data is then caused to be sent to its intended destination based on the stored multi-homing information. The multi-homing information is also stored for the particular translation device. When data is received at the particular translation device for the established SCTP association between the two hosts, the data is caused to be sent to its intended destination based on the multi-homing information.

A method 900 of and wireless communications unit 800 for effecting a handoff from a first Internet Protocol (IP) connection 221 to a second IP connection 331 for a time critical communication is disclosed. The method includes communicating 905 between a first wireless station 219 and a second station 331 using the first IP connection and a first IP address 223 for the first wireless station; setting up 907 the second IP connection with a second IP address for the first wireless station, the first IP connection being a primary connection and the second IP connection being a secondary connection, both existing concurrently; determining 915 that the second IP connection should be the primary connection; and changing 917 the second IP connection to the primary connection by informing the second station that the second IP address is the primary address using stream control transmission protocol (SCTP) messages, wherein the time critical communication is immediately switched over to the second IP connection.

The present invention describes a method, system and an interconnecting handler for sending connection-oriented or connectionless data between two endpoints in a protocol architecture. The transport protocol in the protocol architecture is in a preferred embodiment the Stream Control Transmission Protocol (SCTP). The present invention allows the setup and release of a connection when using a simplified protocol stack which is able to provide the same kind of services without using peer-to-peer messages like SCCP or SUA use. The present invention also enables discrimination between connection-oriented and connectionless services without peer-to-peer signalling.

The invention discloses a method for reducing an influence of data packet disorder on stream control transmission protocol (SCTP) multipath transmission. The method comprises the following steps of: (1) acquiring metric values of paths according to the path bandwidth, the delay and the packet loss ratio, measured in real time, of each independent path; and performing path scheduling and data packet distribution according to the metric values; and (2) judging a path which loses a data packet by using a transmitting terminal through an SACK block transmitted by a receiving terminal and carryingout end-to-end path-based data packet rapid transmission. The method can effectively reduce the influence of the data packet disorder on the SCTP multipath transmission, and can improve the performance of SCTP-based end-to-end multipath.

Disclosed are methods and apparatus for reliably handling Stream Control Transmission Protocol (SCTP) multi-homed connections across multiple translation (e.g., NAT devices), such that messages sent between endpoints, which include one or more multi-homed devices, reach their intended destination. In one embodiment, a method for handling SCTP multi-homed connections across multiple translation devices is disclosed. When an SCTP association between two hosts is being established through a particular translation device, multi-homing information for one or both of the hosts is communicated from the particular translation device to one or more other translation devices which are associated with the particular translation device. This is done so that the one or more other translation devices can store the received multi-homing information and when data is received at the one or more translation devices for the established SCTP association between the two hosts, the data is then caused to be sent to its intended destination based on the stored multi-homing information. The multi-homing information is also stored for the particular translation device. When data is received at the particular translation device for the established SCTP association between the two hosts, the data is caused to be sent to its intended destination based on the multi-homing information.

The present disclosure provides methods and systems for automatic transport path selection for multi-home entities in Stream Control Transmission Protocol (SCTP). The present invention provides systems and methods for directing data transfer between applications and devices residing on different computers or devices using a dynamic path selection algorithm for multi-homed network entities (using SCTP). When an application or device requests to transfer data to another application or device, the dynamic path selection algorithm selects the most efficient path for data transfer. The decision to select the best network path is based upon the dynamic network conditions, such as, for example, congestion window (CWND), round trip time (RTT), and the like, and / or provisioning information.

Methods and systems for routing messages between a core network and a radio network controller are provided. A radio access network gateway translates messages from an ATM-based protocol to a non-ATM-based protocol, such as the stream control transmission protocol and vice versa. The radio access network gateway forwards the SCTP messages to the core network. In addition, the radio access network gateway receives messages from the core network formatted according to the core network protocol and translates these messages to an ATM-based protocol for communication to a radio network controller.

A method of adjusting quality of service (QoS) with respect to changes in a transmission environment of a mobile terminal receiving data based on a stream control transmission protocol (SCTP) session. When the transmission environment of the mobile terminal receiving data based on the SCTP session changes, the mobile terminal transmits link information indicating a new transmission environment to a destination node, and the destination node adjusts the quality of data or the size of a transmission window based on the link information. Thus, without adding separate network devices, the QoS of the data being transmitted can be adjusted with respect to the changed transmission environment, only by adding functions with software to the transmission terminal and the reception terminal. Also, since the destination node manually adjusts the transmission window according to the link information, packet loss can be minimized compared to the conventional congestion control method.

A transport layer protocol such as the Stream Control Transmission Protocol uses a new traffic control technique instead of the TCP slow start algorithm. The procedure assumes that the network on which it is implemented has a fixed bandwidth assigned for the connection, and that the allotted bandwidth roughly matches the traffic load. Based on this, under message loss conditions it is only necessary to ensure that signaling traffic emitted into the network by the sender is no greater than the fixed bandwidth that has been allocated to the connection. That is, retransmissions take bandwidth away from a fixed allocation that has been made for the connection, but do not cause the connection itself to reduce the overall traffic it generates into the network; rather, it maintains the same traffic level. This technique prevents congestion in the network from increasing when message loss occurs; at the same time it does not reduce bandwidth for the association as rapidly as the slow start procedure.

A graphic user interface of a network client (106) includes a stock ticker from a stock server (110) and a news sidebar from a news server (112) over the IP addresses advertised to the client (106) in its list of mutli-homed addresses from the video server (104) specified under Stream Control Transmission Protocol (SCTP). The client accepts real-time data from the stock exchange server and the news agency server on the multi-homed IP addresses designated in the association with the video server (104) without knowing that the data is coming from a different source than the video server (104). The real-time data feeds from the video, stock and news servers are aggregated on the client (106) with enhanced speed because the feeds come directly to the client and not via the video server. The operating systems of the home server and remote servers utilize SCTP and specialized commands to implement the enhanced speed of real-time data aggregation being streamed to network clients without requiring modifications to existing client systems.

The invention discloses a method for fragmenting data in a stream control transmission protocol (SCTP). The method is characterized in that the data fragmentation value of the SCTP is adjusted according to the link condition of a network, wherein, the data fragmentation value thereof is lower than or equal to the smallest maximum transmission unit (MTU) among all the efficient paths of the SCTP. The invention further provides two methods for realizing the manual optimization and automatic optimization of the PMTU (path maximum transmission unit) respectively, and reasonably adjusts the data fragmentation value of the SCTP according to the link condition of the network, thereby improving the reliability and efficiency of the communication link.

The invention relates to a multipath cocurrent transmission method based on an SCTP (Stream Control Transmission Protocol), relating to data transmission and communication among multiaddress host computers. The method is characterized in that multipath reachable paths are simultaneously utilized to carry out end-to-end data transmission by expanding a main standby path mechanism of the standard SCTP in the same SCTP relationship and adopting certain path detection and path selection strategies; meanwhile, distinguishing from the only correspondence mechanism of the path and the target address in the realization of the traditional SCTP protocol, the invention utilizes a (an original address and a target address) binary unit to define the path together so that the number of the available paths in the relationship to be maximal and the basis for realizing more complex paths is provided; finally, the invention is based on a Linux system to carry out code realization, and the data groups are sent strictly according to the designated original address and the target address under the condition of multiple available paths. The invention efficiently improves the throughput of end-to-end data transmission on the basis of keeping the advantage of strong fault tolerance of the standard SCTP protocol.

A terminal having a stream control transmission protocol (SCTP)-based handover function and an SCTP-based handover methods, the terminal including: a session management unit to initiate an SCTP session with a second terminal; a link layer information collection unit to store beacon signals in a link layer state information database; a signal intensity extraction unit to, if the terminal enters an overlapping area of first and second communication areas, extract an intensity of a beacon signal transmitted by a second base station managing the second communication area from the link layer state information database; and a handover unit to, if the intensity is greater than a critical value, add an IP address received from the second base station to the SCTP session, and to, if the intensity is greater than a second critical value, requests the second terminal to communicate with the terminal using the received IP address.

The invention provides a method utilizing a stream control transmission protocol to measure network transmission quality and a device thereof. The method includes: step 1, a home terminal network element transmits a heartbeat text to an opposite terminal network element at an interval of a first preset time, wherein heartbeat information of the heartbeat text contains an answer heartbeat text, step 2, the home terminal network element receives the answer heartbeat text transmitted by the opposite terminal network element for answering the heartbeat text and counts the answer heartbeat texts received with a second preset time so as to acquire statistics information, and step 3, the home terminal network element computes transmission quality of transmission texts corresponding to the heartbeat texts on the transmission network according to the statistics information, the transmitting time stamp information and the local receiving time of the answer heartbeat texts. The method and the device thereof utilize SCTP to measure network transmission quality so as to prevent interfaces on the SCTP protocol from jamming caused by reduction of transmission quality to further cause interruption of service.

A transport layer protocol such as the Stream Control Transmission Protocol uses a new traffic control technique instead of the TCP slow start algorithm. The procedure assumes that the network on which it is implemented has a fixed bandwidth assigned for the connection, and that the allotted bandwidth roughly matches the traffic load. Based on this, under message loss conditions it is only necessary to ensure that signaling traffic emitted into the network by the sender is no greater than the fixed bandwidth that has been allocated to the connection. That is, retransmissions take bandwidth away from a fixed allocation that has been made for the connection, but do not cause the connection itself to reduce the overall traffic it generates into the network; rather, it maintains the same traffic level. This technique prevents congestion in the network from increasing when message loss occurs; at the same time it does not reduce bandwidth for the association as rapidly as the slow start procedure.

The invention discloses a method for multi-home routing of a stream control transmission protocol (SCTP). The method comprises the following steps: starting a quality assessment for a channel, calculating a quality assessment value of each channel; making a comparison between the quality assessment values of all the channels, and selecting the channel with the highest quality assessment value to send a data message. The invention simultaneously discloses a device for multi-home routing of the SCTP. When the method and the device are used, the network chooses the channel with the highest quality assessment value to send the data message, and in case that a channel fault affects the transmission efficiency, other channels with good qualities can be chosen for transmission. Therefore, the invention can enhance the capability of handling various channel faults, and can improve the transmission rate and the transmission quality of the data in further.

The invention discloses a method of state transition of steam control transmission protocol, which comprises the following steps: after a home terminal SCTP is coupled into SHUTDOWN-PENDING status and when the home terminal SCTP judges that data which is not sent exists in a sending buffer and the receiving window of an opposite terminal SCTP is larger than or equal to the length of the current first datum which is not sent, the home terminal SCTP sends the first datum which is not sent to the opposite terminal SCTP and starts a latency response timer Ta; when the latency response timer Ta is beyond a regular time and if the home terminal SCTP does not receive a response from the opposite terminal, SCTP coupling is closed. The method of the invention ensures that the coupling can be put into use quickly when the home terminal SCTP receives the request to close coupling from SHUTDOWN, the user of an upper level, and if data needs sending to the opposite terminal SCTP and data can not be sent successfully for a long time caused by small receiving buffer of the opposite terminal SCTP or other reasons.

The embodiment of the invention discloses a method, a device and a system for detecting link interruption, wherein the method comprises the following steps: detecting the connecting state of a stream control transmission protocol SCTP link between a first communication device and a second communication device by the first communication device, generating SCTP link interruption message to transmit to the second communication device on the opposite end when SCTP link connection is detected to be unusually interrupted, notifying the second communication device to dismount the SCTP link which is interrupted, and transferring business data on the SCTP link which is interrupted to a standby SCTP link which is normally connected. The embodiment of the invention which is adopted can rapidly detect out a SCTP link which is not interrupted to be connected, timely notifies a far-end communication device to dismount the SCTP link which is disconnected, transfers business data on the disconnected SCTP link to other normally-connected SCTP links, and reduces the detection to business loss during linkage interrupt of the SCTP.

The method comprises: maintaining the preset parameters in the data structure of each communication path link-coupled under SCTP (stream control transmission protocol); determining the amount of SCTP link-coupled communication paths; determining the correlated relation between the source address and the destination address of each communication path; determining the main path; when needing to make the switch of main path, polling each SCTP link-coupled communication path except the main path to select a proper communication path as new main path.

The invention discloses an automatic switching method for an SCTP (stream control transmission protocol) main path in the technical field of communication. The method comprises the following steps of: initializing parameters; forecasting the time delay of the main path and each alternative path according to the initialized parameters; computing and forecasting the bandwidth and the packet loss of the main path and each alternative path; computing the comprehensive performance evaluation value of each alternative path; respectively comparing the comprehensive performance evaluation value of each alternative path with the comprehensive performance evaluation threshold value of the path, if the comprehensive performance evaluation value of each alternative path is less than or equal to the comprehensive performance evaluation threshold value of the path, selecting the alternative path with the minimum comprehensive performance evaluation value to replace the main path in the alternative path of which the comprehensive performance evaluation value is less than or equal to the comprehensive performance evaluation threshold value of the path, and automatically switching the main path; and finally, carrying out congestion control and / or retransmission avoidance. According to the method, the main path can be automatically switched according to the comprehensive performance evaluation threshold value of the path, so that the data transmission efficiency and the coupling reliability can be improved.

In an example embodiment, a method for selecting a communication path is provided. The method may comprise receiving data encapsulated in a transport protocol. In addition, a classification type and exit path information associated with the classification type may be received. The data is associated with the classification type and then is encapsulated in Stream Control Transmission Protocol (SCTP) based on the exit path information. This exit path information is associated with the classification type that is associated with the data.

The invention provides a multi-cell network of a home base station and a realization method of the multi-cell network of the home base station. The method comprises the following steps: at least one cell message is stored in the home base station; the home base station establishes at least one SCTP (stream control transmission protocol) connection with a gateway and carries out registration to the gateway according to the stored cell messages; the home base station records the congruent relationship of all cells and the SCTP connection and all the cells carry out data interaction with the gateway through the corresponding SCTP connection. In the multi-cell network of the home base station and the realization method of the multi-cell network of the home base station, the purpose that a single home base station supports multiple cells is achieved, the limitation that the single home base station can only support a single wireless cell is broken, the networking mode of the home base station is enriched, and the application prospect of the home base station is expanded.

The invention relates to the electric power communication technical field and provides a multipath simultaneous transmission method in wide area backup protection. The multipath simultaneous transmission method comprises selecting an optimal path performance evaluation value of path from all paths and setting a path performance evaluation value as the formula; performing comparison on path performance evaluation values and the formula; performing path selection according to a path selection evaluation result and enabling data to be transmitted and switched to an optimal path set. According to the multipath simultaneous transmission method in the wide area backup protection, the path selection is performed according to SCTP (Stream Control Transmission Protocol) protocol characteristics to obtain the optimal path set, the paths are transmitted and switched to the optimal path set for multipath simultaneous transmission, and accordingly the coupling throughput can be improved, the average data transmission delay can be reduced, the data transmission delay fluctuation is small, and accordingly a foundation is laid for the implementation of seamless switching, the reliability of the wide area backup protection is ensured, and the utilization rate and the data transmission efficiency of coupling resources are improved.

The invention discloses a method for data transmission, comprising the steps that: A. a progressed network sending device and a progressed network receiving device create flow control transmission protocol couplings by their own ports; B. the progressed network sending device sends the top layer information together with data to the progressed network receiving device; C. after receiving the top layer information and data, the progressed network receiving device decides the top layer protocol stack according to the top layer information. The invention solves the problem that flow control transmission protocol coupling occupies large resource in current technology. The invention also discloses a system and a device for data transmission.

The invention discloses a method for processing an access mode based on a family base station. The stream control transmission protocol connection is established between a family base station and a core network; the family base station informs the access mode information of the family base station to the core network; and if the access mode of the family base station is changed, the family base station informs the updated access mode information to the core network, wherein the access mode information expresses the access mode of the family base station. The access mode information of the family base station is informed to the core network by the technical scheme through a message between the family base station and the core network or a family base station gateway so that the core network can learn the access mode of the family base station in time, the problem of error generation of UE access is avoided and the network performance and the user experience are effectively improved.

A method and a device are provided for categorizing a Stream Control Transmission Protocol (SCTP) receiver terminal (120) as a malicious SCTP receiver terminal, which generates spoofed optimistic SCTP selective acknowledgement (SACK) packet for exploiting a SCTP transmitter terminal as a flood source for Denial-of-Service attacks. The SCTP receiver terminal (120) generates data enriched SCTP SACK packets (170). Each data enriched SCTP SACK packet comprises a cumulative payload essence of all successfully received data packets (200). The SCTP transmitter terminal (110) performs a data enriched SACK validation in which it computes the cumulative payload essence of all successfully transmitted data packets (200), and compares the computed value with the cumulative payload essence contained in the received data enriched SACK. The SCTP transmitter terminal detects a spoofed optimistic SACK packet if the comparison results in a difference.

The invention discloses a signaling retransmission method and an apparatus based on Stream Control Transmission Protocol (SCTP). The method comprises the steps of numbering an independent signaling data packet and a plurality of validation data packets, and transmitting the independent signaling data packet and the plurality of validation data packets to a receiving end in order; receiving SACK message transmitted from the receiving end and determining whether the number of the SACK message reaches to a preset value; making sure the loss of signaling data packets corresponding to the lost signaling data packets of a plurality of SACK message in terms of number, when the number of the received SACK message reaches to the preset value; retransmitting the signaling data packets that are determined to be lost to the receiving end. The method transmits a plurality of validation data packets after transmitting the independent signaling data packet, and thereby it can be determined whether the independent signaling data packet is lost or not through the plurality of validation data packets. When it is ensured that the signaling data packet is lost, the lost signaling data packet based onSCTP can be effectively retransmitted in time.

The invention provides a method for processing SCTP (stream control transmission protocol) link failure of an S1 interface. The method includes the steps: searching UE (user equipment) in a connection state on an SCTP link when an MME (mobility management entity) detects that the SCTP link is disconnected; adding the identity of the UE into a release access bearing request message; transmitting the release access bearing request message to an S-GW (service-gateway); returning a release access bearing reply message to the MME. The S-GW is used for releasing bearing resources of S1-U interfaces of the UE. The bearing resources of a plurality of S1-U interfaces of the UE can be released once, equipment modification is less, modification cost is low, the frequency of message transmission is decreased, and requirements for performances of a network, home terminal equipment and opposite terminal equipment are lowered.

The present invention provides a long term evolution (LTE) dedicated network networking method and system based on wireless backhaul. The method comprises the steps that a base station and an evolved packet core (EPC) establish a connection based on an S1 interface protocol; a stream control transmission protocol (SCTP) and a GTP-U tunnel transmission protocol between a next level of base station and the EPC are encapsulated inside a GTP-U tunnel transmission protocol of the upper level of base station and the EPC; the EPC receives a protocol packet sent by the base station, and then acquires a transmission protocol in the protocol packet; the EPC determines whether the transmission protocol is the encapsulated GTP-U tunnel transmission protocol; and if yes, the transmission protocol is decapsulated and a packet head is removed, and the transmission protocol encapsulated in the innermost layer is acquired. Through adoption of the method, an LTE wireless air interface data transmission capability of the last level of base station is used as a backhaul network of the next level of base station, and networking construction cost is effectively controlled, and further, extensibility of LTE dedicated network construction is improved.

The invention discloses a wireless network congestion control method based on a stream control transmission protocol (SCTP) and mainly solves the problem of low network throughput when data are transmitted by using a standard SCTP in wireless channel environment. The method comprises the following steps of: (1) establishing an SCTP session; (2) performing congestion control, and updating a smooth round-trip time (Srtt) value; (3) quickly retransmitting a data packet which is reported to be lost for four times, and setting the updated Srtt value as the time of a quick retransmission timer of the data packet; and (4) when the quick retransmission timer expires, if the data packet does not receive a reply, quickly retransmitting the data packet again. The wireless network congestion control method has the advantages that by improvement of the conventional SCTP, the network throughput during data transmission is improved, and the method can be applied to wireless network environment.