36 results about "Link Capacity Adjustment Scheme" patented technology

Disclosed is a method for dynamically and losslessly adjusting bandwidth of an embedded Resilient Packet Ring (RPR) ring network, in which dynamic and lossless bandwidth adjustment for an RPR ring network embedded in a Synchronous Digital Hierarchy (SDH) / Synchronous Optical Network (SONET) can be realized through adding a Link Capacity Adjustment Scheme (LCAS) system in the SDH / SONET processing layer. When it is required to increase ring network bandwidth, the bandwidth of the link section between sites on the SDH / SONET processing layer is first increased. Then the LCAS system in the SDH / SONET processing layer is started, and the actual bandwidth of the link on the SDH / SONET processing layer is increased losslessly with the LCAS system. Finally the bandwidth of the ring network on the RPR processing layer is increased. When it is required to decrease ring network bandwidth, the bandwidth of the ring network on the RPR processing layer is first decreased. Then the LCAS system in the SDH / SONET processing layer is started, and the actual bandwidth of the link on the SDH / SONET processing layer is decreased losslessly with the LCAS system. Finally the bandwidth of the link section between sites on the SDH / SONET processing layer is decreased. With the disclosed method, dynamic and lossless bandwidth adjustment for an embedded RPR ring network in SDH / SONET can be realized.

The present invention provides methods and apparatuses for interfacing high-layer applications to Link Capacity Adjustment Scheme (LCAS) on Synchronous Optical Network / Synchronous Digital Hierarchy (SONET / SDH) edge nodes. These applications include high-level control protocols, such as Generalized Multiprotocol Label Switching (GMPLS) and Optical Switching and Routing Protocol (OSRP), and user-initiated cross-connect creation and termination. The present invention provides a mechanism that is capable of mapping SONET / SDH connections to Virtual Concatenated Groups (VCGs), thus enabling an efficient interface for operators to control and manage the connections via LCAS. As part of the mechanism, the existing LCAS protocol state machine is enhanced such that the operators can shut down bi-directional SONET / SDH flows from a single edge node, as opposed to from both source and sink nodes, as provided for by existing specifications.

A channel control apparatus is arranged in a plurality of nodes on a source as a transmission side and at a node on a sink as a reception side, and changes a bandwidth of virtual concatenation (VC) between the nodes on the source and the sink using link capacity adjustment scheme (LCAS) information. The channel control apparatus includes a VC / LCAS main controller that sets member use-request information for the VC or member usable information for the VC in the LCAS information, and changes the member of the VC between the nodes on the source and the node on the sink.

The transport capacity of a Virtual Concatenation Group (VCG) can be reduced under control of a Link Capacity Adjustment Scheme (LCAS). The VCG comprises link members, in which payload data are transmitted. A first control message comprising a fail message (RFAIL) for a link member is transmitted from sink to source, while the sink continues reception of payload data. On reception of the first control message at the source, a second control message is transmitted comprising a message (FDNU) indicating that payload data of the link member shall not be used, and transmission of payload data is discontinued. On reception of the second control message at the sink reception of payload data is discontinued, and the link member is removed. This allows a reduction of the transport capacity of a Virtual Concatenation Group to be performed in a hitless manner, even when initiated at the sink side.

A device determines a high watermark threshold for a subrate service, compares a traffic demand to the high watermark threshold, and adds a temporary bandwidth to an original bandwidth available to the subrate service if the traffic demand is greater than or equal to the high watermark threshold.

Equipment enables an improved efficiency in network bandwidth usage, and an improved upper-layer throughput even when abrupt change occurs in input traffic. The equipment includes an input traffic collector which collects and retains an input traffic amount of each input port for one period at preset periods; a bandwidth set processor which calculates a bandwidth for use in each input port from the input traffic amount retained in the input traffic collector, and calculates the corresponding number of virtual concatenation member paths from the difference of the bandwidth in use and a virtual concatenation path bandwidth having been allocated to the input port, and issues an addition command or a deletion command for adding or deleting the virtual concatenation member paths for the calculated number; a virtual concatenation controller which sets a virtual concatenation path bandwidth against the traffic input from the plurality of ports; and a link capacity adjustment scheme controller which sets and changes the virtual concatenation to the virtual concatenation controller, based on the addition command or the deletion command of the virtual concatenation member paths issued by the bandwidth set processor.

A system and method provides the capability to provision and setup an end-to-end circuit that does not require the performance of extra, manual management link addition / removal procedures after all facilities and VT / STS cross connections have been provisioned. A method of provisioning a circuit comprises the steps of provisioning an Ethernet port facility, including determining a members of a Link Capacity Adjustment Scheme Virtual Concatenation Group before virtual tributary or synchronous transport signal cross connections are provisioned and before Synchronous Optical Network or Synchronous Digital Hierarchy cross-connections are provisioned; provisioning virtual tributary or synchronous transport signal cross connections; and provisioning Synchronous Optical Network or Synchronous Digital Hierarchy cross-connections.

A technique controls the capacity of a virtual concatenation group (VCG) carried on a SONET path of a data network. Efficient control of VCG capacity is provided by emulating aspects of a Link Capacity Adjustment Scheme (LCAS) protocol in software. A hardware poller facility is employed to manage the status and state of the VCG, as well as members belonging to the VCG. The hardware poller contains one or more VCG state machines (VSMs) and member state machines (MSMs) configured to maintain the status and states of the VCGs and their members.

Techniques are disclosed for restoration of virtually-concatenated data traffic in a data transmission network. A virtually-concatenated group is formed comprising: (i) a plurality of primary members each associated with a corresponding data stream, and (ii) at least one backup member. Each of the plurality of primary members and the backup member of the virtually-concatenated group may be assigned a corresponding one of a plurality of data transmission routes between first and second nodes of the network. Responsive to a failure of a given one of the plurality of primary members, the backup member is utilized for restoring at least a portion of the data traffic of the given member. The invention also provides a modified link capacity adjustment scheme (LCAS) protocol which substantially reduces the time required to report changes in member status information from a sink node to a source node, thereby substantially reducing the amount of time required to perform a restoration operation.

A method for modifying bandwidth in a Bandwidth on Demand (BoD) service includes: a User Network Interface (UNI) client (UNI-C) sends the BoD service based bandwidth modification message to a UNI network (UNI-N) via control plane signaling, the bandwidth modification message carrying a bandwidth modification value; the UNI-N modifies bandwidth according to the bandwidth modification amount and a lower layer tunnel granularity. An apparatus for modifying bandwidth in a BoD service is also disclosed. According to the present invention, by adopting Generalized Multi-Protocol Label Switching (GMPLS) on the control plane and Link Capacity Adjustment Scheme (LCAS), Virtual Concatenation (VC) and Generic Framing Procedure (GFP) on the transport plane, the BoD service can be automatically set up and a client is able to modify service bandwidth according to changes of service traffic dynamically in real time.

A system and method provides the capability to provision and setup an end-to-end circuit that does not require the performance of extra, manual management link addition / removal procedures after all facilities and VT / STS cross connections have been provisioned. A method of provisioning a circuit comprises the steps of provisioning an Ethernet port facility, including determining a members of a Link Capacity Adjustment Scheme Virtual Concatenation Group before virtual tributary or synchronous transport signal cross connections are provisioned and before Synchronous Optical Network or Synchronous Digital Hierarchy cross-connections are provisioned; provisioning virtual tributary or synchronous transport signal cross connections; and provisioning Synchronous Optical Network or Synchronous Digital Hierarchy cross-connections.

A member of a Virtual Concatenation Group (VCG) can be temporarily disabled under control of a Link Capacity Adjustment Scheme (LCAS). The VCG comprises a number of link members, in which payload data are transmitted. A management command (MLOCKOUT) is transmitted from a management system to at least one of the source and sink side for one member requesting the member to be temporarily disabled. In response to the management command a forward control message is transmitted from the source side comprising a message (FDNU) indicating that payload data of the member shall not be used, and transmission of payload data for the member is discontinued. In this way temporary disabling of a VCG member is provided, in which it is ensured that the same member is enabled again when the operation requiring the disabling is completed, and which can be handled as a separate function by the management system.

The transport capacity of a Virtual Concatenation Group (VCG) can be reduced under control of a Link Capacity Adjustment Scheme (LCAS). The VCG comprises link members, in which payload data are transmitted. A first control message comprising a fail message (RFAIL) for a link member is transmitted from sink to source, while the sink continues reception of payload data. On reception of the first control message at the source, a second control message is transmitted comprising a message (FDNU) indicating that payload data of the link member shall not be used, and transmission of payload data is discontinued. On reception of the second control message at the sink reception of payload data is discontinued, and the link member is removed. This allows a reduction of the transport capacity of a Virtual Concatenation Group to be performed in a hitless manner, even when initiated at the sink side.

The present invention discloses an implement method of a link capacity readjustment plan protocol, and comprises procedure S102, the description is performed to the link capacity readjustment plan protocol through processing the module realization, a control packet of a link capacity readjustment plan is generated and distributed; procedure S104, a hardware module stores the control packet of the link capacity readjustment plan to a member in a virtual concatenation group according to the control packet of the link capacity readjustment plan; procedure S106, the hardware module analyses a control command according to the stored control packet of the link capacity readjustment plan of the member in the virtual concatenation group; procedure S108, a corresponding payload is imaged in a payload area of a synchronous digital hierarchy frame structure according to a sequence identification; and procedure S110, the control packet of the link capacity readjustment plan of the member in the virtual concatenation group is inserted in the frame structure. The flexible change to the control packet of the link capacity readjustment plan can be realized though using The present invention, the logical resource of the hardware is saved, and the requirement of a system can be met.

Provided is a multi-layer restoration method using a LCAS (Link Capacity Adjustment Scheme) in a synchronous network having a mesh structure. The method includes: performing a hardware restoration method if a network failure is detected; performing a pre-planned restoration method if the network failure is not repaired by performing the hardware restoration method; determining whether channels that pass along a line where the network failure occurs use the LCAS if the network failure is not repaired by performing the pre-planned restoration method; and applying the LCAS to the channels if the channels are determined to use the LCAS, and performing a dynamic restoration method if the channels are not determined to use the LCAS. The multiplayer restoration method minimizes data loss due to an increase in restoration time and overcomes service disconnection caused by failure to obtain a spare channel.

The invention discloses a convergent protocol converter and a transceiving method thereof for automatically recognizing high-level data link control (HDLC) / generic framing procedure (GFP) user side protocol converters. An HDLC / GFP automatic processing module is arranged between an ethernet data-caching module and a virtual concatenate (VCAT) and link capacity adjustment scheme (LCAS) module, thereby automatic HDLC and GFP framing / deframing of a local side single convergent converter is achieved, the transmission of information with multiple far-end single way, multiple ways, HDLC type or GFP type E1 protocol converters is achieved, by means of the mode, the automatic identification can be performed when the user side changes different types of protocol converters, and a system which is high in cost performance ratio and compatibility and convenient to install and maintain can be flexibly achieved.

Disclosed is a method for dynamically and losslessly adjusting bandwidth of an embedded Resilient Packet Ring (RPR) ring network, in which dynamic and lossless bandwidth adjustment for an RPR ring network embedded in a Synchronous Digital Hierarchy (SDH) / Synchronous Optical Network (SONET) can be realized through adding a Link Capacity Adjustment Scheme (LCAS) system in the SDH / SONET processing layer. When it is required to increase ring network bandwidth, the bandwidth of the link section between sites on the SDH / SONET processing layer is first increased. Then the LCAS system in the SDH / SONET processing layer is started, and the actual bandwidth of the link on the SDH / SONET processing layer is increased losslessly with the LCAS system. Finally the bandwidth of the ring network on the RPR processing layer is increased. When it is required to decrease ring network bandwidth, the bandwidth of the ring network on the RPR processing layer is first decreased. Then the LCAS system in the SDH / SONET processing layer is started, and the actual bandwidth of the link on the SDH / SONET processing layer is decreased losslessly with the LCAS system. Finally the bandwidth of the link section between sites on the SDH / SONET processing layer is decreased. With the disclosed method, dynamic and lossless bandwidth adjustment for an embedded RPR ring network in SDH / SONET can be realized.

A communication system and method provide fractional protection of Resilient Packet Ring (RPR) span bandwidth (BW) by provisioning the number of SONET paths in a given span to greater than the RPR ring BW. A communication system comprises a plurality of Synchronous Optical Network paths, a Resilient Packet Ring span implemented using the plurality of Synchronous Optical Network paths, and a Link Capacity Adjustment Scheme operable, in response to failure of a Synchronous Optical Network path implementing the Resilient Packet Ring span, to remove the failed Synchronous Optical Network path from implementing the Resilient Packet Ring span and to redistribute the Resilient Packet Ring traffic over the remaining Synchronous Optical Network paths.

The invention discloses network equipment and a method for adjusting link capacity by using the network equipment. The method comprises the following steps of: sending a loopback detection message through each port, wherein the loopback detection message carries a port number of the port which sends the loopback detection message and an attribute identifier M for uniquely identifying the network equipment; when the loopback detection message which carries the attribute identifier M is received, determining that the line state of a port N corresponding to the port number which is carried in the received loopback detection message in the network equipment is a loop; and when the negotiation of a link capacity adjustment scheme (LCAS) is required to be carried out, selecting the port of which the line state is not the loop to participate in the negotiation of the LCAS. By the invention, the influence of loopback on functions of the LCAS can be effectively avoided, so the whole transmission network is more stable.

A device determines a high watermark threshold for a subrate service, compares a traffic demand to the high watermark threshold, and adds a temporary bandwidth to an original bandwidth available to the subrate service if the traffic demand is greater than or equal to the high watermark threshold.

A method for removing a member of a Link Capacity Adjustment Scheme (LCAS) from a sink includes: notifying, by the sink, a source that a member is in a REMOVE state after receiving a remove command; determining, by the sink, whether a notification response is received; if the notification response is not received, keeping the member in the REMOVE state, keeping reading payload from the member, and waiting for the notification response; if the notification response is received, moving the member to an IDLE state. Embodiments of the present invention also provide an apparatus and a state machine at the sink. A REMOVE state at the sink is added for each member. The method and the state machine provided by embodiments of the present invention guarantee a synchronous modification of the bandwidth at the source and the sink, thereby guaranteeing no hit on the traffic.

This invention relates to a method for adding and deleting members in a link volume adjustment plan, in which, a management system starts up additions and deletions of members from a virtual cascade set and configures members to be added or deleted in a same VCG set and sends the result down to devices of two direction ends to add and delete members based on the control frame and the SDH layer alarm. This invention is easy in operation since it applies an independent configuration technology at the source and host ends in the same direction without time sequence.

The invention includes a method and apparatus for transporting a client signal over a transport network using enhanced virtual concatenation (VCAT) and enhanced link capacity adjustment scheme (LCAS) techniques. A method includes provisioning, for a client signal, a virtual concatenation group (VCG) signal having a VCG signal bandwidth, converting the VCG signal into a set of VCG member signals including a plurality of working VCG member signals and at least one protection VCG member signal where the set of VCG member signals has an aggregate bandwidth greater than the VCG signal bandwidth, and propagating the client signal toward the transport network using the set of VCG member signals. The client signal is initially conveyed by the working VCG member signals, and the at least one protection VCG member signal is available to protect the working VCG member signals. The client signal may be a constant bit rate (CBR) client signal.

The present invention provides methods and apparatuses for interfacing high-layer applications to Link Capacity Adjustment Scheme (LCAS) on Synchronous Optical Network / Synchronous Digital Hierarchy (SONET / SDH) edge nodes. These applications include high-level control protocols, such as Generalized Multiprotocol Label Switching (GMPLS) and Optical Switching and Routing Protocol (OSRP), and user-initiated cross-connect creation and termination. The present invention provides a mechanism that is capable of mapping SONET / SDH connections to Virtual Concatenated Groups (VCGs), thus enabling an efficient interface for operators to control and manage the connections via LCAS. As part of the mechanism, the existing LCAS protocol state machine is enhanced such that the operators can shut down bi-directional SONET / SDH flows from a single edge node, as opposed to from both source and sink nodes, as provided for by existing specifications.

Provided is a multi-layer restoration method using a LCAS (Link Capacity Adjustment Scheme) in a synchronous network having a mesh structure. The method includes: performing a hardware restoration method if a network failure is detected; performing a pre-planned restoration method if the network failure is not repaired by performing the hardware restoration method; determining whether channels that pass along a line where the network failure occurs use the LCAS if the network failure is not repaired by performing the pre-planned restoration method; and applying the LCAS to the channels if the channels are determined to use the LCAS, and performing a dynamic restoration method if the channels are not determined to use the LCAS. The multiplayer restoration method minimizes data loss due to an increase in restoration time and overcomes service disconnection caused by failure to obtain a spare channel.

A member of a Virtual Concatenation Group (VCG) can be temporarily disabled under control of a Link Capacity Adjustment Scheme (LCAS). The VCG comprises a number of link members, in which payload data are transmitted. A management command (MLOCKOUT) is transmitted from a management system to at least one of the source and sink side for one member requesting the member to be temporarily disabled. In response to the management command a forward control message is transmitted from the source side comprising a message (FDNU) indicating that payload data of the member shall not be used, and transmission of payload data for the member is discontinued. In this way temporary disabling of a VCG member is provided, in which it is ensured that the same member is enabled again when the operation requiring the disabling is completed, and which can be handled as a separate function by the management system.

The invention relates to a method for transmitting data in a data network using virtual containers, which are combined to form a virtual concatenated group by means of the Link Capacity Adjustment Scheme, LCAS. The virtual concatenated group is sub-divided on the send side into a first virtual concatenated group and a second virtual concatenated group. Data of a first type is inserted on the sendside into the first virtual concatenated group and data of the second type is inserted into the second virtual concatenated group. Said data is then transmitted via the data network.

The invention includes a method and apparatus for transporting a client signal over a transport network using enhanced virtual concatenation (VCAT) and enhanced link capacity adjustment scheme (LCAS) techniques. A method includes provisioning, for a client signal, a virtual concatenation group (VCG) signal having a VCG signal bandwidth, converting the VCG signal into a set of VCG member signals including a plurality of working VCG member signals and at least one protection VCG member signal where the set of VCG member signals has an aggregate bandwidth greater than the VCG signal bandwidth, and propagating the client signal toward the transport network using the set of VCG member signals. The client signal is initially conveyed by the working VCG member signals, and the at least one protection VCG member signal is available to protect the working VCG member signals. The client signal may be a constant bit rate (CBR) client signal.

The invention discloses a convergent protocol converter and a transceiving method thereof for automatically recognizing high-level data link control (HDLC) / generic framing procedure (GFP) user side protocol converters. An HDLC / GFP automatic processing module is arranged between an ethernet data-caching module and a virtual concatenate (VCAT) and link capacity adjustment scheme (LCAS) module, thereby automatic HDLC and GFP framing / deframing of a local side single convergent converter is achieved, the transmission of information with multiple far-end single way, multiple ways, HDLC type or GFP type E1 protocol converters is achieved, by means of the mode, the automatic identification can be performed when the user side changes different types of protocol converters, and a system which is high in cost performance ratio and compatibility and convenient to install and maintain can be flexibly achieved.

Methods for extracting packetized data from a SONET / SDH signal include processing the signal to produce a deskewed data stream; demapping the data stream to produce a stream of packets; and temporarily storing the packets in a packet buffer, wherein the demapping is performed at a first rate when the fullness of the buffer is below a fullness threshold and the demapping is performed at a second rate when the fullness of the buffer is at or above the fullness threshold. Apparatus for performing the methods are also disclosed.