CN106330371A - Information bearing method and network architecture - Google Patents
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Abstract
The embodiment of the invention discloses an information bearing method. The method comprises steps: a signal carrying user signal dwell time is received; a node concatenated dwell time accumulation value during the signal transmission process is calculated; according to the node concatenated dwell time accumulation value, the user signal dwell time is updated; and a signal carrying the updated user signal dwell time is transmitted. The embodiment of the invention also discloses a network architecture for information bearing.
Description
Technical Field
The present invention relates to the field of information processing technologies, and in particular, to a method for carrying information and a network architecture.
Background
A traditional telecommunication network adopts a Global Positioning System (GPS) receiver to perform time synchronization; on one hand, with the diversity development of telecommunication network services and the continuous enlargement of telecommunication network scale, higher requirements are put forward on the realization cost and the safety of network time synchronization; in recent years, it has become an emerging synchronization technology to implement Network time synchronization by distributing synchronization information in a Network, for example, a 1588 precision time synchronization technology is adopted in ethernet and Packet Transport Network (PTN) to implement Network time synchronization. On the other hand, with the dramatic increase of network capacity, an Optical Transport Network (OTN) technology replaces a traditional Synchronous Digital Hierarchy (SDH) technology and a Dense Wavelength Division Multiplexing (WDM) technology to become a main backbone network transmission technology; moreover, with the convergence of three networks and the proliferation of the number of network users, OTN devices are also beginning to be applied to metropolitan area networks and access networks.
The commercial use of the existing network time synchronization technology is that the synchronization between communication devices is realized in a single type of network, and the communication devices belong to a time synchronization domain; however, with further convergence of networks, there will be a need in the future for multiple sub-networks on a communication network to belong to independent synchronization domains; however, when a plurality of different access users are transported via an OTN, how to implement time synchronization of each access user independently, that is, how to carry time synchronization information of different user networks, is an urgent problem to be solved.
Disclosure of Invention
In view of this, embodiments of the present invention are expected to provide an information carrying method and a network architecture, which can effectively carry time synchronization information and implement time synchronization of an access user.
The technical scheme of the embodiment of the invention is realized as follows:
the embodiment of the invention provides a method for bearing information, which comprises the following steps: receiving a signal carrying the residence time of a user signal; calculating the cumulative value of the node concatenation residence time of the signal in the transmission process; updating the residence time of the user signal according to the accumulated value of the node concatenation residence time; and sending a signal carrying the updated user signal residence time.
In the above scheme, the receiving a signal carrying a residence time of a user signal includes: and performing framing processing on one or more user signals carrying the residence time of the user signals, and mapping or multiplexing the one or more user signals into one or more first-layer network signals.
In the above solution, the calculating an accumulated value of node concatenation residence time of the signal in the transmission process includes:
when a user signal is mapped into a first-layer network signal, calculating the residence time of each node through which the first-layer network signal passes, and accumulating the residence time of each node to obtain a node cascading residence time accumulated value; or, when multiplexing the user signal into the first layer network signal, calculating the node cascade residence time of the transmission path passed by the first layer network signal, after multiplexing the first layer network signal into the second layer network signal, calculating the node cascading residence time of a transmission path through which the second-layer network signals pass until the N-1-layer network signals are multiplexed into the N-layer network signals, calculating the node cascading residence time of the transmission path through which the N-layer network signals pass, and demultiplexing the N-th network signal into a low-rate network signal and demapping the low-rate network signal into a user signal, calculating the node residence time of the user signal after demapping, and accumulating all the calculated node cascading residence time and the node residence time of the user signal after demapping to obtain a node cascading residence time accumulated value; wherein N is a natural number greater than 1.
In the foregoing solution, the updating the user signal residence time according to the cumulative value of the node concatenation residence time includes: and adding the cumulative value of the node concatenation residence time and the residence time of the user signal to obtain the updated residence time of the user signal.
In the above scheme, the method further comprises: storing the node cascading residence time of a transmission path through which the M-1-th network signal passes to a second storage area of the M-th network signal, and storing the node cascading residence time of the transmission path through which the M-th network signal passes to a first storage area of the M-th network signal; wherein M is more than or equal to 2 and less than or equal to N.
The embodiment of the present invention further provides a network architecture for carrying information, where the network architecture includes: the system comprises a signal receiving node, a signal processing node and a signal sending node; wherein,
the signal receiving node is used for receiving a signal carrying the residence time of a user signal;
the signal processing node is used for calculating a node cascading residence time accumulated value of the signal in the transmission process and updating the residence time of the user signal according to the node cascading residence time accumulated value;
and the signal sending node is used for sending a signal carrying the updated user signal residence time.
In the foregoing scheme, the signal receiving node is specifically configured to perform framing processing on one or more user signals carrying the residence time of the user signal, and map or multiplex the user signals into a first layer of OTN signals.
In the above scheme, the signal processing node is specifically configured to calculate the residence time of each node through which a first-layer network signal passes when the signal node maps a user signal to the first-layer network signal, and accumulate the residence time of each node to obtain a node concatenation residence time accumulated value; or, when the signal node multiplexes the user signal into the first layer network signal, calculating the node concatenation residence time of the transmission path through which the first layer network signal passes, after the first layer network signal is multiplexed into the second layer network signal, calculating the node concatenation residence time of the transmission path through which the second layer network signal passes, until the N-1 layer network signal is multiplexed into the N layer network signal, calculating the node concatenation residence time of the transmission path through which the N layer network signal passes, demultiplexing the N layer network signal into the low-rate network signal, demapping the low-rate network signal into the user signal, calculating the node residence time through which the demapped user signal passes, accumulating the calculated node concatenation residence time of all the node and the demapped node residence time through which the user signal passes, obtaining a node concatenation residence time accumulated value; wherein N is a natural number greater than 1.
In the foregoing solution, the signal processing node is specifically configured to add the node concatenation residence time accumulated value to the user signal residence time to obtain an updated user signal residence time.
In the foregoing solution, the information processing node is further configured to store the node concatenation residence time of the transmission path through which the M-1 th network signal passes in a second storage area of the M-th network signal, and store the node concatenation residence time of the transmission path through which the M-th network signal passes in a first storage area of the M-th network signal; wherein M is more than or equal to 2 and less than or equal to N.
The method for bearing information and the network architecture provided by the embodiment of the invention comprise the following steps: receiving a signal carrying the residence time of a user signal; calculating the cumulative value of the node concatenation residence time of the signal in the transmission process; updating the residence time of the user signal according to the accumulated value of the node concatenation residence time; sending a signal carrying the updated user signal dwell time; the received signal may be a plurality of signals transmitted by a plurality of users. Therefore, the time synchronization of the user signals in the transmission process is realized by calculating the node concatenation residence time accumulated value of the signals in the transmission process and updating the residence time in the user time synchronization information according to the node concatenation residence time accumulated value; when the signal is multiple, the time synchronization of each access user signal is independently realized.
Drawings
Fig. 1 is a schematic diagram illustrating a basic processing flow of a method for carrying information according to an embodiment of the present invention;
fig. 2 is a detailed processing flow diagram of a method for carrying information according to an embodiment of the present invention;
fig. 3 is a detailed processing flow diagram of a second method for carrying information according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a structure of a network architecture for carrying information according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a network architecture for carrying information according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a network architecture for carrying information according to a second embodiment of the present invention.
Detailed Description
In an embodiment of the present invention, a method for carrying information includes: receiving a signal carrying the residence time of a user signal; calculating the cumulative value of the node concatenation residence time of the signal in the transmission process; updating the residence time of the user signal according to the accumulated value of the node concatenation residence time; and sending a signal carrying the updated user signal residence time.
Here, the ONT carries time synchronization information between the source clock and the slave clock, that is, the source clock and the slave clock are connected end to end through the OTN; the source clock and the slave clock may refer to an OTN off-hook node device or network; the multiple source clock and slave clock time synchronization groups can respectively belong to independent user networks and belong to different time synchronization domains.
As shown in fig. 1, a basic processing flow of the method for bearing information provided in the embodiment of the present invention includes the following steps:
step 101, receiving a signal carrying a user signal dwell time;
specifically, a signal receiving node in the OTN receives a source clock of a user layer network or a signal carrying residence time of a user signal sent from a clock, frames the signal carrying residence time of the user signal, multiplexes or maps the signal into a first layer network signal, calculates the residence time of the user signal passing through the signal receiving node, and records the residence time in a first storage area of the first layer network signal;
wherein, the network signal is an OTN signal, and the user signal dwell time refers to a time delay generated before the signal enters the OTN; correspondingly, the first layer network signal refers to a first layer OTN signal;
here, the information further includes a synchronization information data unit, which refers to a data structure containing time synchronization information;
in the embodiment of the invention, a payload unit of an OTN is used for bearing a synchronous information data unit and user signal residence time; when the synchronous information data unit and the service data of the user are sent to the OTN together, the synchronous information data unit is directly loaded into a payload unit of the OTN; when the synchronous information data unit is not sent together with the service data of the user in the signal sending process but has an independent transmission channel, extracting the synchronous information data unit and the user signal residence time in the transmission channel, and loading the synchronous information data unit, the user signal residence time and the service data of the user into a payload unit of the OTN;
it should be noted that, in the embodiment of the present invention, the synchronization information data unit and the residence time of the user signal may be loaded into a payload unit of the OTN in any data encapsulation structure, and may be in various forms of encapsulated frame structures, packet structures, or non-encapsulated byte groups; such as: ethernet packet structures, IPV4 packet structures, IPV6 packet structures, GFP-encapsulated data structures, etc., as may be specified for the 1588 precision time synchronization protocol.
102, calculating a node concatenation residence time accumulated value of the signal in the transmission process;
specifically, when all signal processing nodes in the OTN are signal relay forwarding nodes, a first signal relay forwarding node calculates the residence time of the first layer of OTN signals passing through the first signal relay forwarding node, extracts the residence time of the user signals calculated in step 101 passing through the signal receiving node, accumulates the extracted residence time and the residence time of the first layer of OTN signals passing through the first signal relay forwarding node, and stores the accumulated residence time and residence time in a first storage area of the OTN signals; when the first layer of OTN signal passes through a second signal relay forwarding node, the second signal relay forwarding node extracts the residence time in the first storage area, calculates the residence time of the first layer of OTN signal passing through the second signal relay forwarding node, adds the extracted residence time and the residence time passing through the second signal relay forwarding node, and stores the sum to the first storage area; analogizing in sequence until the last signal relay forwarding node in the OTN extracts the residence time in the first storage area, calculating the residence time of the first-layer network signal passing through the last signal relay forwarding node, and adding the residence time extracted in the first storage area and the calculated residence time of the first-layer network signal passing through the last signal relay forwarding node;
when all the signal processing nodes in the OTN are signal aggregation nodes, the signal processing nodes in the OTN calculate the node concatenation residence time of a transmission path through which the first layer network signal passes, and record the node concatenation residence time in a first storage area of the OTN; when the first layer of OTN signals are multiplexed and converged to the second layer of OTN signals, namely when the first layer of OTN signals are multiplexed and converged to the higher-speed OTN signals, the signal processing node extracts the node concatenation residence time in a first storage area of the first layer of OTN signals, and stores the extracted node concatenation residence time to a second storage area of the second layer of OTN signals; by analogy, each layer of OTN signal records the node cascade residence time of the path through which the corresponding layer of OTN signal passes, and the node cascade residence time of the transmission path through which the OTN signal at each level of speed passes is extracted.
Here, the first storage area is an OTN signal overhead, the second storage area is a payload unit in the OTN, and the last signal processing node may be a signal aggregation node or a signal relay forwarding node; when calculating the node concatenation residence time or updating the node concatenation residence time, the signal processing node in the OTN can compensate the deviation according to the actual situation, and the specific deviation compensation amount can be obtained by adopting the existing various network delay deviation measurement modes.
It should be noted that the cumulative value of the node concatenation residence time according to the embodiment of the present invention may be stored in any data structure form to the overhead of the OTN signal, and is not limited to a certain structure, and may also be various frame structures or packet structures without encapsulation, byte groups, or with encapsulation, etc.; the position of the node concatenation residence time accumulated value in the overhead of the OTN signal is not particularly limited, and the node concatenation residence time accumulated value can be any unused position reserved in the overhead of the existing OTN signal; the node concatenation time-of-residence cumulative value can be carried by a frame, or can be carried by a plurality of continuous frames.
103, updating the residence time of the user signal according to the cumulative value of the node concatenation residence time;
specifically, a signal sending node in the OTN demultiplexes the network signal of the N-th layer into a low-rate network signal and demaps the low-rate network signal into a user signal, calculates the node residence time that the demapped user signal passes through, extracts a node concatenation residence time accumulated value in the OTN signal, that is, the residence time that each user signal passes through the entire OTN network, accumulates all the node concatenation residence times calculated in step 102 and the node residence time that the demapped user signal passes through to obtain a node concatenation residence time accumulated value, and adds the node concatenation residence time accumulated value and the user signal residence time to obtain an updated user signal residence time accumulated value;
wherein, extracting the node concatenation residence time accumulated value in the OTN signal comprises: demultiplexing a high-rate OTN signal into a low-rate OTN signal by a signal sending node in the OTN, demapping and separating the low-rate OTN signal to obtain a user signal, and extracting a node concatenation residence time accumulated value in the OTN signal; or the signal sending node in the OTN directly de-maps the first layer of OTN signals to obtain user signals, and extracts the node concatenation residence time accumulated value in the OTN signals.
Step 104, sending a signal carrying the updated user signal residence time;
specifically, a signal sending node in the OTN sends a signal carrying the updated residence time of the user signal to a slave clock or a source clock of a user layer network; when the signal received by the signal receiving node is sent by a source clock of a user layer network, sending the signal carrying the updated user signal residence time to a slave clock of the user layer network; when the signal received by the signal receiving node is sent by a slave clock of a user layer network, sending the signal carrying the updated user signal residence time to a source clock of the user layer network;
it should be noted that, the manner of carrying the synchronization information data unit and the residence time of the user signal by the user signal in the user layer network is not limited to a certain one, and different network types and signal types may adopt different carrying manners according to the current communication network technology; the user layer Network may be various networks such as an ethernet Network or a Packet Transport Network (PTN), or may be another OTN; meanwhile, the calculation method of the residence time of the user signal in the user network is not limited, and the time synchronization method in the current single network can be used according to different types of the user networks; in the embodiment of the present invention, the signal receiving node and the signal sink node may be implemented by a user signal access node, a user signal sink node, or a user signal forwarding node when performing the above functions.
Method embodiment one
As shown in fig. 2, a detailed processing flow of a method for carrying information according to an embodiment of the present invention includes the following steps:
step 201, receiving a signal sent by a source clock of a user layer network;
specifically, a first user signal forwarding node in the OTN receives a signal sent by a source clock of a user layer network, performs framing processing on the signal, and maps the signal into an OTN signal;
wherein the signal carries a user signal dwell time and a synchronization information data unit;
here, the user signal dwell time refers to a time delay generated before the signal enters the OTN, and the synchronization information data unit refers to a data structure containing time synchronization information; after receiving the signal, the first user signal forwarding node utilizes a payload unit of the OTN to bear a synchronous information data unit and user signal residence time;
it should be noted that, in the embodiment of the present invention, the synchronization information data unit and the residence time of the user signal may be loaded into a payload unit of the OTN in any data encapsulation structure, and may be in various forms of encapsulated frame structures, packet structures, or non-encapsulated byte groups; such as: ethernet packet structures, IPV4 packet structures, IPV6 packet structures, GFP-encapsulated data structures, etc., as may be specified for the 1588 precision time synchronization protocol.
Step 202, a first user signal forwarding node calculates the residence time of the OTN signal passing through itself, and sends the OTN signal;
specifically, the first user signal forwarding node calculates the residence time of the OTN signal passing through the first user signal forwarding node, records the residence time in the overhead of the OTN signal, and sends the OTN signal to the first signal relay forwarding node.
Step 203, each signal relay forwarding node calculates the residence time of the OTN signal and sends the OTN signal;
specifically, a first signal relay forwarding node receives the OTN signal, calculates the residence time of the OTN signal at the first signal relay forwarding node, adds the residence time recorded by the first signal relay forwarding node to the residence time recorded by a signal receiving node to obtain a first node concatenation residence time accumulated value, records the first node concatenation residence time accumulated value in the overhead of the OTN signal, and sends the OTN signal to a second signal relay forwarding node;
the second signal relay forwarding node receives the OTN signal, calculates the residence time of the OTN signal at the second signal relay forwarding node, and adds the residence time recorded by the second signal relay forwarding node to the accumulated value of the first node cascading residence time in the OTN signal overhead to obtain the accumulated value of the second node cascading residence time; recording the second node concatenation residence time accumulated value in an OTN signal overhead, and sending the OTN signal to a third signal relay forwarding node;
the third signal relay forwarding node receives the OTN signal, calculates the residence time of the OTN signal at the third signal relay forwarding node, and adds the residence time recorded by the third signal relay forwarding node to a second node cascading residence time accumulated value in the OTN signal overhead to obtain a third node cascading residence time accumulated value; and recording the third node concatenation residence time accumulated value in the overhead of the OTN signal, and sending the OTN signal to a second user signal forwarding node.
Step 204, the second user signal forwarding node sends the OTN signal to a slave clock of a user layer network;
specifically, the second user signal forwarding node calculates the time delay of the OTN signal itself, directly demaps the OTN signal to obtain a user signal, extracts a node concatenation residence time accumulated value in the OTN signal, adds the third node concatenation residence time accumulated value in the OTN signal overhead, the time delay of the OTN signal at the second user signal forwarding node, and the user signal residence time to obtain the whole path residence time of the user signal, and sends the OTN signal carrying the whole path residence time to a slave clock of a user layer network.
Method embodiment two
As shown in fig. 3, a detailed processing flow of the information bearing method according to the second embodiment of the present invention includes the following steps:
step 301, receiving a signal sent by a user layer network;
specifically, a first user signal sink node in the OTN receives a first user signal sent by a source clock of a first user layer network, performs framing processing on the first user signal, and maps the first user signal to a first layer of OTN signal corresponding to the first user signal; a first user signal sink node in the OTN receives a second user signal sent by a slave clock of a second user layer network, frames the second user signal and maps the second user signal into a first layer OTN signal corresponding to the second user signal; the first user signal sink node calculates the time delay of each user signal passing through the node, stores the time delay of the first user signal passing through the node to the first layer of OTN signal overhead corresponding to the first user signal, and stores the time delay of the second user signal passing through the node to the first layer of OTN signal overhead corresponding to the second user signal; the first user signal aggregation node aggregates a first layer of OTN signals corresponding to the first user signals and a first layer of OTN signals corresponding to the second user signals into second layer of OTN signals, and calculates node concatenation residence time of a transmission path through which the second layer of OTN signals pass, wherein the node concatenation residence time of the transmission path through which the second layer of OTN signals pass is stored to a second layer of OTN signal overhead, and values in the first layer of OTN signal overhead and payload units are stored to a payload unit of the second layer of OTN signals;
the first user signal carries a first user signal dwell time and a first synchronization information data unit, and the second user signal carries a second user signal dwell time and a second synchronization information data unit.
It should be noted that, in the embodiment of the present invention, the synchronization information data unit and the residence time of the user signal may be loaded into a payload unit of the OTN in any data encapsulation structure, and may be in various forms of encapsulated frame structures, packet structures, or non-encapsulated byte groups; such as: ethernet packet structures, IPV4 packet structures, IPV6 packet structures, GFP-encapsulated data structures, etc., as may be specified for the 1588 precision time synchronization protocol.
Step 302, the first signal relay forwarding node calculates the residence time of the second layer OTN signal passing through itself, and sends the second layer OTN signal;
specifically, the first signal relay forwarding node calculates the residence time of the second layer OTN signal passing through the first signal relay forwarding node, records the residence time in the overhead of the second layer OTN signal, and sends the second layer OTN signal.
Step 303, receiving a signal sent by a user layer network;
specifically, a second user signal sink node in the OTN receives a first user signal sent by a source clock of a third user layer network, performs framing processing on the first user signal, and maps the first user signal into a first layer OTN signal corresponding to the third user signal; a second user signal sink node in the OTN receives a fourth user signal sent by a slave clock of a fourth user layer network, frames the fourth user signal and maps the fourth user signal into a first layer OTN signal corresponding to the fourth user signal; the second user signal sink node calculates the time delay of each user signal passing through the node, stores the time delay of the third user signal passing through the node to the first layer of OTN signal overhead corresponding to the third user signal, and stores the time delay of the fourth user signal passing through the node to the first layer of OTN signal overhead corresponding to the fourth user signal; the second user signal aggregation node aggregates the first layer of OTN signals corresponding to the third user signals and the first layer of OTN signals corresponding to the fourth user signals into second layer of OTN signals, and calculates node concatenation residence time of a transmission path through which the second layer of OTN signals pass, and the node concatenation residence time of the transmission path through which the second layer of OTN signals pass is stored to a second layer of OTN signal overhead; the values in the overhead and payload units of the OTN signals of the first layer are stored in the payload units of the OTN signals of the second layer;
the first user signal carries a third user signal dwell time and a third synchronization information data unit, and the fourth user signal carries a fourth user signal dwell time and a fourth synchronization information data unit.
It should be noted that, in the embodiment of the present invention, the synchronization information data unit and the residence time of the user signal may be loaded into a payload unit of the OTN in any data encapsulation structure, and may be in various forms of encapsulated frame structures, packet structures, or non-encapsulated byte groups; such as: ethernet packet structures, IPV4 packet structures, IPV6 packet structures, GFP-encapsulated data structures, etc., as may be specified for the 1588 precision time synchronization protocol.
Step 304, the OTN signal convergence node converges the second layer of OTN signals obtained by converging the first user signal and the second user signal, and the second layer of OTN signals obtained by converging the third user signal and the fourth user signal into a third layer of OTN signals;
specifically, a payload unit and overhead of a second layer of OTN signals, which are obtained by converging a first user signal and a second user signal, and a payload unit and overhead of a second layer of OTN signals, which are obtained by converging a third user signal and a fourth user signal, are stored in a payload unit of a third layer of OTN signals, and the overhead of the third layer of OTN signals is used for storing node concatenation residence time, through which the third layer of OTN signals are transmitted, and is stored in the third layer of OTN signal overhead through the node concatenation residence time.
305, a second signal relay forwarding node receives the third layer of OTN signals, calculates the node residence time of the third layer of OTN signals passing through itself, and sends the third layer of OTN signals;
specifically, the second signal relay forwarding node stores the calculated node residence time of the third layer OTN signal through the second signal relay forwarding node to the overhead of the third layer OTN signal.
Step 306, the second user signal sink node receives the third layer of OTN signals, demultiplexes and de-maps the third layer of OTN signals into user signals, and then sends the user signals;
specifically, the second user signal sink node receives the third layer OTN signal with high speed, demultiplexes the third layer OTN signal into a network signal with low speed, de-maps the network signal with low speed into corresponding first, second, third and fourth user signals, calculates the residence time of the first, second, third and fourth user signals passing through the second user signal sink node after de-mapping, extracts the node cascade residence time stored in the overhead and payload of the third layer OTN signal, adds all the node cascade residence time of one user signal and the residence time of the user signal passing through the second user signal sink node to obtain the node cascade residence time accumulated value of the user passing through the entire network, adds the node cascade residence time accumulated value of the user passing through the entire network and the user signal residence time of the user, obtaining an updated user signal residence time accumulated value; and sending a signal carrying the first synchronization information data and the updated residence time accumulated value of the first user signal to a slave clock of the first user signal, sending a signal carrying the second synchronization information data and the updated residence time accumulated value of the second user signal to a source clock of the second user signal, sending a signal carrying the third synchronization information data and the updated residence time accumulated value of the third user signal to a slave clock of the third user signal, and sending a signal carrying the fourth synchronization information data and the updated residence time accumulated value of the fourth user signal to a source clock of the fourth user signal.
In the above embodiment of the present invention, first, the OTN is used as an independent transparent clock cascade system, residence times of each path of user signals at an upper path node and a lower path node of each user network and at an edge of the OTN are different, and residence times of all paths of user signals passing through the same transmission path in the OTN network after entering the OTN are also the same; secondly, an OTN signal payload unit is used for bearing a synchronous information data unit and user signal residence time of each user signal, and an OTN signal overhead is used for bearing an OTN signal node cascading residence time accumulated value; when the OTN comprises the OTN signal aggregation node, the OTN signal overheads of different levels bear the node cascade residence time of a section of path through which the OTN signal of the layer passes, and the OTN signal aggregation node has the characteristic of layering and staging; the OTN comprises various nodes such as an OTN signal convergence node, an OTN signal forwarding node and the like, so that the OTN signal can be conveniently added or dropped at any time in the network, and the flexibility of the OTN networking is enhanced; thirdly, when the OTN bears the user signal, except for the node for receiving the user signal, namely the uplink node and the node for sending the user signal, namely the downlink node, when the OTN transmits the signal, the user synchronization information data unit does not need to be analyzed and processed, and only the node cascade residence time of the OTN signal in the OTN needs to be calculated, so that the processing is simple and easy, the realization of the OTN node equipment for supporting the time synchronization function is simplified, and the network cost is reduced; finally, the OTN is used as an independent transparent clock cascading system, each node in the OTN calculates the residence time of the OTN signal at each node, only the clock frequency synchronization is needed to be carried out in the OTN, and the time synchronization of the node and the accessed user layer network is not needed, so that different user layer networks belonging to different time domains can be independently carried by the OTN, and the time synchronization without mutual interference is realized.
In order to implement the method for carrying information, an embodiment of the present invention provides a network architecture for carrying information, where a structure of the network architecture, as shown in fig. 4, includes: a signal receiving node 10, a signal processing node 11 and a signal transmitting node 12; wherein,
the signal receiving node 10 is configured to receive a signal carrying a residence time of a user signal;
the signal processing node 11 is configured to calculate a cumulative value of node concatenation residence time of the signal in the transmission process, and update the residence time of the user signal according to the cumulative value of node concatenation residence time;
the signal sending node 12 is configured to send a signal carrying the updated user signal dwell time.
In this embodiment of the present invention, the signal receiving node 10 is specifically configured to perform framing processing on one or more user signals carrying the residence time of the user signal, and map or multiplex the user signals into a first layer of OTN signals.
In the embodiment of the present invention, the signal processing node 11 is specifically configured to calculate the residence time of each node through which a first-layer network signal passes when a signal node maps a user signal to the first-layer network signal, and accumulate the residence time of each node to obtain a node concatenation residence time accumulated value; or,
when the signal node multiplexes the user signal into the first layer network signal, the node cascade residence time of the transmission path passed by the first layer network signal is calculated, after the first layer network signal is multiplexed into the second layer network signal, calculating the node cascading residence time of a transmission path through which the second-layer network signals pass until the N-1-layer network signals are multiplexed into the N-layer network signals, calculating the node cascading residence time of the transmission path through which the N-layer network signals pass, and demultiplexing the N-th network signal into a low-rate network signal and demapping the low-rate network signal into a user signal, calculating the node residence time of the user signal after demapping, and accumulating all the calculated node cascading residence time and the node residence time of the user signal after demapping to obtain a node cascading residence time accumulated value; wherein N is a natural number greater than 1.
In this embodiment of the present invention, the signal processing node 11 is specifically configured to add the cumulative value of the node concatenation residence time to the residence time of the user signal to obtain an updated residence time of the user signal.
In this embodiment of the present invention, the signal processing node 11 is further configured to store the node concatenation residence time of the transmission path through which the M-1 th network signal passes into the second storage area of the M-th network signal, and store the node concatenation residence time of the transmission path through which the M-th network signal passes into the first storage area of the M-th network signal; wherein M is more than or equal to 2 and less than or equal to N.
In this embodiment of the present invention, the functions implemented by the signal receiving node 10 and the signal sending node 12 may be respectively executed by a user signal sink node or a user signal forwarding node.
Here, the first storage area is an OTN signal overhead, the second storage area is a payload unit in the OTN, and the last signal processing node may be a signal aggregation node or a signal relay forwarding node; when calculating the node concatenation residence time or updating the node concatenation residence time, the signal processing node in the OTN can compensate the deviation according to the actual situation, and the specific deviation compensation amount can be obtained by adopting the existing various network delay deviation measurement modes.
It should be noted that the cumulative value of the node concatenation residence time according to the embodiment of the present invention may be stored in any data structure form to the overhead of the OTN signal, and is not limited to a certain structure, and may also be various frame structures or packet structures without encapsulation, byte groups, or with encapsulation, etc.; the position of the node concatenation residence time accumulated value in the OTN signal open box is not particularly limited, and the accumulated value can be any unused position reserved in the existing OTN signal overhead; the node concatenation time-of-residence cumulative value can be carried by a frame, or can be carried by a plurality of continuous frames.
In the embodiment of the present invention, extracting the node concatenation residence time accumulated value in the OTN signal includes: demultiplexing a high-rate OTN signal into a low-rate OTN signal by a signal sending node in the OTN, demapping and separating the low-rate OTN signal to obtain a user signal, and extracting a node concatenation residence time accumulated value in the OTN signal; or the signal sending node in the OTN directly de-maps the first layer of OTN signals to obtain user signals, and extracts the node concatenation residence time accumulated value in the OTN signals.
Apparatus embodiment one
A schematic structural diagram of a network architecture for carrying information provided in an embodiment of the present invention is shown in fig. 5, and includes: a first user signal forwarding node 20, a first signal relay forwarding node 21, a second signal relay forwarding node 22, a third signal relay forwarding node 23 and a second user signal forwarding node 24; wherein,
the first user forwarding node 20 is configured to receive a signal sent by a source clock in a user layer network, perform framing processing on the signal, and map the signal into an OTN signal; calculating the residence time of the OTN signal passing through the first user signal forwarding node, recording the residence time in the overhead of the OTN signal, and sending the OTN signal to the first signal relay forwarding node 21;
wherein the signal carries a user signal dwell time and a synchronization information data unit;
here, the user signal dwell time refers to a time delay generated before the signal enters the OTN, and the synchronization information data unit refers to a data structure containing time synchronization information; after receiving the signal, the first user signal forwarding node utilizes a payload unit of the OTN to bear a synchronous information data unit and user signal residence time;
it should be noted that, in the embodiment of the present invention, the synchronization information data unit and the residence time of the user signal may be loaded into a payload unit of the OTN in any data encapsulation structure, and may be in various forms of encapsulated frame structures, packet structures, or non-encapsulated byte groups; such as: ethernet packet structures, IPV4 packet structures, IPV6 packet structures, GFP-encapsulated data structures, etc., as may be specified for the 1588 precision time synchronization protocol.
The first signal relay forwarding node 21 is configured to receive the OTN signal, calculate a residence time of the OTN signal at the first signal relay forwarding node, add the residence time recorded by the first signal relay forwarding node and the residence time recorded by the signal receiving node to obtain a first node concatenation residence time cumulative value, record the first node concatenation residence time cumulative value in an overhead of the OTN signal, and send the OTN signal to the second signal relay forwarding node.
The first signal relay forwarding node 22 is configured to receive the OTN signal, calculate a residence time of the OTN signal at the second signal relay forwarding node, and add the residence time recorded by the second signal relay forwarding node to a first node cascading residence time accumulated value in the overhead of the OTN signal to obtain a second node cascading residence time accumulated value; and recording the second node concatenation residence time accumulated value in the overhead of the OTN signal, and sending the OTN signal to a third signal relay forwarding node.
The third signal relay forwarding node 23 is configured to receive the OTN signal, calculate a residence time of the OTN signal at the third signal relay forwarding node, and add the residence time recorded by the third signal relay forwarding node to a second node cascading residence time accumulated value in the overhead of the OTN signal to obtain a third node cascading residence time accumulated value; and recording the third node concatenation residence time accumulated value in the overhead of the OTN signal, and sending the OTN signal to the second user signal forwarding node 24.
The second user signal forwarding node 24 is configured to send the OTN signal to a slave clock of a user layer network;
specifically, the second user signal forwarding node 24 calculates the delay of the OTN signal itself, directly demaps the OTN signal to obtain a user signal, extracts a node concatenation residence time accumulated value in the OTN signal, adds the third node concatenation residence time accumulated value in the overhead of the OTN signal, the delay of the OTN signal at the second user signal forwarding node, and the residence time of the user signal to obtain the residence time of the entire path of the user signal, and the second user signal forwarding node sends the OTN signal carrying the residence time of the entire path to the slave clock of the user layer network.
Device embodiment II
A schematic structural diagram of a network architecture for carrying information provided in the second embodiment of the present invention is shown in fig. 6, and includes: a first user signal sink node 31, a first signal relay forwarding node 32, a second user signal sink node 33, an OTN signal sink node 34, a second signal relay forwarding node 35, and a second user signal sink node 36; wherein,
the first user signal sink node 31 is configured to receive a signal sent by a user layer network;
specifically, the first user signal sink node 31 is specifically configured to receive a first user signal sent by a source clock of a first user layer network, perform framing processing on the first user signal, and map the first user signal into a first layer OTN signal corresponding to the first user signal; a first user signal sink node in the OTN receives a second user signal sent by a slave clock of a second user layer network, frames the second user signal and maps the second user signal into a first layer OTN signal corresponding to the second user signal; calculating the time delay of each user signal passing through the node, storing the time delay of the first user signal passing through the node to the first layer of OTN signal overhead corresponding to the first user signal, and storing the time delay of the second user signal passing through the node to the first layer of OTN signal overhead corresponding to the second user signal; converging a first layer of OTN signals corresponding to the first user signals and a first layer of OTN signals corresponding to the second user signals into second layer of OTN signals, and calculating node concatenation residence time of a transmission path through which the second layer of OTN signals pass, wherein the node concatenation residence time of the transmission path through which the second layer of OTN signals pass is stored to second layer of OTN signal overhead, and values in the first layer of OTN signal overhead and payload units are stored to payload units of the second layer of OTN signals;
the first user signal carries a first user signal dwell time and a first synchronization information data unit, and the second user signal carries a second user signal dwell time and a second synchronization information data unit.
The first signal relay forwarding node 32 is configured to calculate a residence time of the second layer OTN signal passing through itself, record the residence time in the overhead of the second layer OTN signal, and send the second layer OTN signal.
The second user signal sink node 33 is configured to receive a signal sent by a user layer network;
specifically, a first user signal sent by a source clock of a third user layer network is received, and the first user signal is subjected to framing processing and mapped into a first layer OTN signal corresponding to the third user signal; a second user signal sink node in the OTN receives a fourth user signal sent by a slave clock of a fourth user layer network, frames the fourth user signal and maps the fourth user signal into a first layer OTN signal corresponding to the fourth user signal; calculating the time delay of each user signal passing through the node, storing the time delay of the third user signal passing through the node to the first layer of OTN signal overhead corresponding to the third user signal, and storing the time delay of the fourth user signal passing through the node to the first layer of OTN signal overhead corresponding to the fourth user signal; converging a first layer of OTN signals corresponding to the third user signals and a first layer of OTN signals corresponding to the fourth user signals into a second layer of OTN signals, and calculating node concatenation residence time of a transmission path through which the second layer of OTN signals pass, wherein the node concatenation residence time of the transmission path through which the second layer of OTN signals pass is stored to a second layer of OTN signal overhead, and values in the first layer of OTN signal overhead and a payload unit are stored to a payload unit of the second layer of OTN signals;
the first user signal carries a third user signal dwell time and a third synchronization information data unit, and the fourth user signal carries a fourth user signal dwell time and a fourth synchronization information data unit.
The OTN signal aggregation node 34 is configured to aggregate a second layer of OTN signals obtained by aggregating the first user signal and the second user signal, and a second layer of OTN signals obtained by aggregating the third user signal and the fourth user signal into a third layer of OTN signals;
specifically, a payload unit and overhead of a second layer of OTN signals, which are obtained by converging a first user signal and a second user signal, and a payload unit and overhead of a second layer of OTN signals, which are obtained by converging a third user signal and a fourth user signal, are stored in a payload unit of a third layer of OTN signals, and the overhead of the third layer of OTN signals is used for storing a node concatenation residence time, which is passed by the transmission of the third layer of OTN signals, and storing the node concatenation residence time to the third layer of OTN signal overhead.
The second signal relay forwarding node 35 is configured to receive the third layer OTN signal, calculate a node residence time of the third layer OTN signal through itself, and send the third layer OTN signal;
specifically, the second signal relay forwarding node 35 stores the calculated node residence time of the third layer OTN signal through the second signal relay forwarding node to the overhead of the third layer OTN signal.
A second user signal sink node 36, configured to receive a third layer of OTN signals, demap the third layer of OTN signals into user signals, and send the user signals;
specifically, the second user signal sink node 36 receives the third layer OTN signal with the high rate, demultiplexes the third layer OTN signal into a network signal with a low rate, demaps the network signal with the low rate into corresponding first, second, third and fourth user signals, calculates residence time of the first, second, third and fourth user signals after demapping through the second user signal sink node, extracts node cascade residence time stored in the overhead and payload of the third layer OTN signal, adds all node cascade residence time of one user signal and residence time of the user signal through the second user signal sink node to obtain a node cascade residence time accumulated value of the user through the entire network, adds the node cascade residence time accumulated value of the user through the entire network and the user signal residence time of the user, obtaining an updated user signal residence time accumulated value; and sending a signal carrying the first synchronization information data and the updated residence time accumulated value of the first user signal to a slave clock of the first user signal, sending a signal carrying the second synchronization information data and the updated residence time accumulated value of the second user signal to a source clock of the second user signal, sending a signal carrying the third synchronization information data and the updated residence time accumulated value of the third user signal to a slave clock of the third user signal, and sending a signal carrying the fourth synchronization information data and the updated residence time accumulated value of the fourth user signal to a source clock of the fourth user signal.
The network architecture of the embodiment of the invention simplifies the networking mode of the OTN for realizing time synchronization, reduces the processing cost of the OTN node time synchronization information, and supports a plurality of user networks to independently carry out non-interfering time synchronization through the OTN, such as different operator networks can be distinguished.
It should be noted that, in practical application, the functions of the signal receiving node 10, the signal processing node 11, the signal sending node 12, the first user signal forwarding node 20, the first signal relaying and forwarding node 21, the second signal relaying and forwarding node 22, the third signal relaying and forwarding node 23, the second user signal forwarding node 24, the first user signal aggregation node 31, the first signal relaying and forwarding node 32, the second user signal aggregation node 33, the OTN signal aggregation node 34, the second signal relaying and forwarding node 35, and the second user signal aggregation node 36 may be implemented by a Central Processing Unit (CPU) or a microprocessor unit (MPU) or a Digital Signal Processor (DSP) or a programmable gate array (FPGA) in an OTN.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A method for carrying information, the method comprising:
receiving a signal carrying the residence time of a user signal;
calculating the cumulative value of the node concatenation residence time of the signal in the transmission process;
updating the residence time of the user signal according to the accumulated value of the node concatenation residence time;
and sending a signal carrying the updated user signal residence time.
2. The method of claim 1, wherein receiving the signal carrying the user signal dwell time comprises:
and performing framing processing on one or more user signals carrying the residence time of the user signals, and mapping or multiplexing the one or more user signals into one or more first-layer network signals.
3. The method of claim 2, wherein said calculating an accumulation of node concatenation residence times of the signal during transmission comprises:
when a user signal is mapped into a first-layer network signal, calculating the residence time of each node through which the first-layer network signal passes, and accumulating the residence time of each node to obtain a node cascading residence time accumulated value; or,
when multiplexing the user signal into the first layer network signal, calculating the node cascade residence time of the transmission path passed by the first layer network signal, after multiplexing the first layer network signal into the second layer network signal, calculating the node cascading residence time of a transmission path through which the second-layer network signals pass until the N-1-layer network signals are multiplexed into the N-layer network signals, calculating the node cascading residence time of the transmission path through which the N-layer network signals pass, and demultiplexing the N-th network signal into a low-rate network signal and demapping the low-rate network signal into a user signal, calculating the node residence time of the user signal after demapping, and accumulating all the calculated node cascading residence time and the node residence time of the user signal after demapping to obtain a node cascading residence time accumulated value; wherein N is a natural number greater than 1.
4. The method of claim 1, wherein said updating the user signal dwell time based on said cumulative value of node concatenation dwell time comprises:
and adding the cumulative value of the node concatenation residence time and the residence time of the user signal to obtain the updated residence time of the user signal.
5. The method of claim 3, further comprising:
storing the node cascading residence time of a transmission path through which the M-1-th network signal passes to a second storage area of the M-th network signal, and storing the node cascading residence time of the transmission path through which the M-th network signal passes to a first storage area of the M-th network signal; wherein M is more than or equal to 2 and less than or equal to N.
6. A network architecture for carrying information, the network architecture comprising: the system comprises a signal receiving node, a signal processing node and a signal sending node; wherein,
the signal receiving node is used for receiving a signal carrying the residence time of a user signal;
the signal processing node is used for calculating a node cascading residence time accumulated value of the signal in the transmission process and updating the residence time of the user signal according to the node cascading residence time accumulated value;
and the signal sending node is used for sending a signal carrying the updated user signal residence time.
7. The network architecture according to claim 6, wherein the signal receiving node is specifically configured to perform framing processing, mapping or multiplexing on one or more user signals carrying a residence time of the user signal into the first layer OTN signal.
8. Network architecture according to claim 7, characterized in that said signal processing node is specifically configured for
When a signal node maps a user signal into a first-layer network signal, calculating the residence time of each node through which the first-layer network signal passes, and accumulating the residence time of each node to obtain a node cascading residence time accumulated value; or,
when the signal node multiplexes the user signal into the first layer network signal, the node cascade residence time of the transmission path passed by the first layer network signal is calculated, after the first layer network signal is multiplexed into the second layer network signal, calculating the node cascading residence time of a transmission path through which the second-layer network signals pass until the N-1-layer network signals are multiplexed into the N-layer network signals, calculating the node cascading residence time of the transmission path through which the N-layer network signals pass, and demultiplexing the N-th network signal into a low-rate network signal and demapping the low-rate network signal into a user signal, calculating the node residence time of the user signal after demapping, and accumulating all the calculated node cascading residence time and the node residence time of the user signal after demapping to obtain a node cascading residence time accumulated value; wherein N is a natural number greater than 1.
9. The network architecture according to claim 6, wherein said signal processing node is configured to add said cumulative value of node concatenation residence time to said user signal residence time to obtain an updated user signal residence time.
10. The network architecture of claim 8, wherein the information processing node is further configured to store the node concatenation residence time of the transmission path traversed by the M-1 th network signal in the second storage area of the M-th network signal, and store the node concatenation residence time of the transmission path traversed by the M-th network signal in a storage area of the M-th network signal; wherein M is more than or equal to 2 and less than or equal to N.
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