CN102983928B - Methods for SDH frame encapsulation and PTN frame de-encapsulation, and a PTN device - Google Patents
Methods for SDH frame encapsulation and PTN frame de-encapsulation, and a PTN device Download PDFInfo
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Abstract
The present invention discloses methods for SDH frame encapsulation and PTN frame de-encapsulation, and a PTN device. The method for SDH frame encapsulation comprises: detecting the type of service carried by an SDH frame received from a user side, and determining an encapsulation mode according to the type of service; and performing a PTN encapsulation directly on the SDH frame according to the determined encapsulation mode, or performing the PTN encapsulation after de-encapsulation of an IP datagram from the SDH frame. According to the methods and the device of the present invention, the intercommunication of a POS port and an Ethernet port on the PTN network can be achieved through the de-encapsulation of the SDH frame and the re-encapsulation PTN frame.
Description
Technical field
The present invention relates to multi-service transportation technology, especially, relate to and a kind ofly encapsulate SDH frame, the method for decapsulation PTN frame and PTN device.
Background technology
At present, IP metropolitan area network part backbone network comprises core layer, convergence-level and service control layer, corresponding equipment is core router (Core Router respectively, CR), convergence router and Broadband Remote Access Server (Broadband Remote Access Server, BRAS)/business router (Service Router, SR).Wherein, the major function of convergence router realizes bandwidth aggregates and trunking, namely, statistic multiplexing is carried out to network traffics and BRAS/SR port (gigabit Ethernet (Gigabit Ethernet, GE) is main) is mated with CR port (10GE is main).Following IP metropolitan area network flattening trend becomes clear day by day, adopt Packet Transport Network (PacketTransport Network, PTN) merge carrying and become one of future network evolution tendency, namely, PTN and even optical transfer network (Optical Transport Network is introduced in MAN backbone network, OTN) carry out merging and carry, to realize bandwidth aggregates and the trunking function of convergence router.
PTN is based on packet switching, connection-oriented multi-service transportation technology, Ethernet service, time division multiplexing (Time Division Multiplexing can be carried, TDM), asynchronous transfer mode (Asynchronous Transfer Mode, and IP operation ATM), meet the transport network attribute such as network high reliability, perfect Operations,Administration And Maintenance (Operation Administration and Maintenance, OAM), extension of network, strict QoS.During current PTN network carrying different business, encapsulation format and processing mode different.For SDH signal, PTN will provide rigid conduit for it; For ethernet signal, PTN will realize statistic multiplexing.
Due to the diversity of metropolitan area network equipment port, it is different that same business enters PTN network possibility encapsulation format, such as, accessor business can be packaged into the form of SDH frame by POS port, also can be packaged into the form of ethernet frame by ethernet port.General PTN device treatment S DH frame is not identical with the mode of ethernet frame, and efficiency of transmission is not identical yet.
Introduce PTN in MAN backbone network after, existing IP device POS port and the interconnected mode of PTN device may be there is, if PTN device still adopts conventional method to carry out the encapsulation process based on TDM to SDH frame, because IP data are bursts, and SDH is fixed bit rate, so can fill accordingly according to IP traffic amount when carrying IP data with SDH, make output signal for fixed bit rate, padding data invalid is in a large number had in the SDH frame causing POS port to export, and invalid padding data generally can transmit by PTN without distinction together with useful data, network transmission efficiency is caused to reduce and network cost increase.In addition, current data equipment is direct-connected by bare fiber, cannot realize intercommunication between POS port and ethernet port.
Summary of the invention
The technical problem that the present invention will solve is to provide and a kind ofly encapsulates SDH frame, the method for decapsulation PTN frame and PTN device, can realize POS port and the intercommunication of ethernet port in PTN network.
According to an aspect of the present invention, propose a kind of method encapsulating SDH frame, comprise the type of service detecting the SDH frame carrying of receiving from user's side joint, and according to type of service determination packaged type; Directly PTN encapsulation is carried out to SDH frame according to determined packaged type, or deblocking takes on IP datagram and carries out PTN encapsulation again from SDH frame.
According to a further aspect in the invention, also proposed a kind of method of decapsulation PTN frame, the PTN frame comprised automatic network side joint is received carries out decapsulation; Determine whether to carry out POS encapsulation according to the signal type after decapsulation; If determine to carry out POS encapsulation, then POS encapsulation is carried out to the IP datagram that deblocking takes on.
According to another aspect of the invention, also proposed a kind of PTN device, comprise SDH frame detecting unit, SDH frame processing unit and PTN frame processing unit, SDH frame processing unit is connected with PTN frame processing unit with SDH frame detecting unit respectively, PTN frame processing unit is connected with SDH frame detecting unit, wherein, SDH frame detecting unit, for detecting the type of service of the SDH frame carrying of receiving from user's side joint, according to type of service determination packaged type, corresponding SDH frame is sent to PTN frame processing unit and SDH frame processing unit according to the packaged type determined, and receive the signal of SDH frame processing unit and the transmission of PTN frame processing unit and be sent to user side, SDH frame processing unit, for receiving SDH frame that SDH frame detecting unit sends, from SDH frame, deblocking takes on IP datagram, the IP datagram that taken on by deblocking is sent to PTN frame processing unit, receive IP datagram that PTN frame processing unit sends and carry out POS encapsulation to IP datagram and the signal after being encapsulated by POS is sent to SDH frame detecting unit, PTN frame processing unit, for respectively PTN encapsulation is carried out to the SDH frame received and IP datagram and be sent to network side, the PTN frame received automatic network side joint carries out decapsulation, the signal type that takes on according to deblocking determines whether to carry out POS encapsulation, the IP datagram of determining to carry out POS encapsulation is sent to SDH frame processing unit and the signal of determining not carry out POS encapsulation is sent to SDH frame detecting unit.
The method of encapsulation SDH frame provided by the invention, decapsulation PTN frame and PTN device, can realize POS port and the intercommunication of ethernet port in PTN network by the encapsulation again of the decapsulation of SDH frame and PTN frame.In addition, the method for above-mentioned encapsulation SDH frame and PTN device can also select suitable PTN packaged type to improve the efficiency of transmission of PTN in metropolitan area network according to the type of service be encapsulated in SDH frame detected.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part.In the accompanying drawings:
Fig. 1 is the schematic flow sheet that the present invention encapsulates an embodiment of the method for SDH frame.
Fig. 2 is the schematic flow sheet that the present invention encapsulates another embodiment of the method for SDH frame.
Fig. 3 is the schematic flow sheet of an embodiment of the method for decapsulation PTN frame of the present invention.
Fig. 4 is the schematic flow sheet of another embodiment of the method for decapsulation PTN frame of the present invention.
Fig. 5 is the structural representation of an embodiment of PTN device of the present invention.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention is wherein described.Exemplary embodiment of the present invention and explanation thereof for explaining the present invention, but do not form inappropriate limitation of the present invention.
Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.
Fig. 1 is the schematic flow sheet that the present invention encapsulates an embodiment of the method for SDH frame.
As shown in Figure 1, this embodiment can comprise the following steps:
S102, detect from user's side joint receive SDH frame (wherein, SDH frame can carry miscellaneous service, and what carry in POS port SDH frame out is IP datagram) type of service that carries, and according to type of service determination packaged type, wherein, the type of service of SDH frame carrying can comprise IP datagram and non-IP datagram, packaged type can comprise to the payload (that is, IP datagram) in SDH frame carry out PTN encapsulation and directly PTN encapsulation is carried out to SDH frame;
S104, directly PTN encapsulation is carried out to SDH frame according to determined packaged type, or deblocking takes on IP datagram and carries out PTN encapsulation again from SDH frame, if that is, the carrying of SDH frame be IP datagram, then first decapsulation is carried out to SDH frame, extract IP datagram, and then PTN encapsulation is carried out to IP datagram, otherwise, decapsulation is not carried out to SDH frame, directly PTN encapsulation is carried out to SDH frame;
In this embodiment, owing to first carrying out decapsulation to the SDH frame of carrying IP datagram, (namely next extract valid data wherein, IP datagram) and eliminate in SDH frame a large amount of invalid datas of filling, and then PTN encapsulation is carried out to valid data, so improve the efficiency of transmission of data to a great extent after carrying out PTN encapsulation.In addition, embodiment also POS port and the intercommunication of ethernet port in PTN network should be achieved by the decapsulation of SDH frame and PTN encapsulation.
Fig. 2 is the schematic flow sheet that the present invention encapsulates another embodiment of the method for SDH frame.
As shown in Figure 2, this embodiment can comprise the following steps:
S202, judges whether the signal format received from user's side joint is SDH frame;
S204, if not, then abandon received signal, otherwise according to system configuration determination packaged type, particularly, system can be configured to direct encapsulation, also can be configured to the type of service determination packaged type carried according to reception message;
S206, if system configuration is directly encapsulation (directly encapsulation can ensure that bandwidth exclusively enjoys, cannot be preempted, but efficiency of transmission is lower), then directly carries out PTN encapsulation to received SDH frame;
S208, if the type of service determination packaged type of system configuration for carrying according to reception message, then detect the type of service of the SDH frame carrying of receiving from user's side joint, and according to type of service determination packaged type, such as, can judge whether Received signal strength is POS encapsulation;
S210, directly carries out PTN encapsulation to SDH frame according to determined packaged type, or deblocking takes on IP datagram and carries out PTN encapsulation again from SDH frame.
This embodiment is by detecting whether payload in SDH frame is the packaged type that IP datagram determines PTN frame, if system configuration be directly encapsulate or the non-IP datagram of payload in SDH frame, then directly carries out PTN encapsulation to SDH frame; If be not configured to direct encapsulation and in analyzing and testing to SDH frame, payload is IP datagram, then first decapsulation is carried out to the IP datagram in SDH frame, and then PTN encapsulation is carried out to IP datagram, in this case, the SDH expense in POS encapsulation and padding data can be removed, (wherein, the statistic multiplexing of bandwidth refers to and can integrate bandwidth according to network real-time traffic the statistic multiplexing that can realize the network bandwidth; But not statistic multiplexing then can only distribute according to flow maximum), improve transmission efficiency and the bandwidth availability ratio of network.The POS port that this embodiment generally adopts mainly for current carrier network and designing, for improving the efficiency of transmission of PTN network carrying router POS port signal, lowers the network construction cost of operator.Meanwhile, identical with the signal after ethernet port encapsulation process in frame format by the signal after this embodiment encapsulation process POS port, so the adaptive intercommunication of PTN user side POS port and ethernet port can be realized.
The above embodiment of the present invention directly can also encapsulate multi-service transport platform (Multi-ServiceTransport Platform, MSTP) the SDH frame in network, direct encapsulation SDH frame represents PTN using SDH frame as load, namely, PTN network carrying SDH net, namely MSTP overPTN, thus the network interworking between PTN network and MSTP can be realized.
Above-described embodiment can be realized by PTN device, and these two embodiments show PTN device and receive the handling process after the frame signal of user side.Corresponding with the handling process of Fig. 1 and Fig. 2 embodiment, the embodiment in following Fig. 3 and Fig. 4 also can be realized by PTN device, these two embodiments show PTN device receive the frame signal of automatic network side after handling process.The PTN frame decapsulation process of Fig. 3 and Fig. 4 embodiment is the inverse process of the SDH frame encapsulation of Fig. 1 and flow process embodiment illustrated in fig. 2.
Fig. 3 is the schematic flow sheet of an embodiment of the method for decapsulation PTN frame of the present invention.
As shown in Figure 3, this embodiment can comprise the following steps:
S302, carries out decapsulation to the PTN frame that automatic network side joint is received;
S304, determines whether to carry out POS encapsulation according to the signal type after decapsulation, particularly, first judges whether the signal after decapsulation is IP datagram, if be IP datagram, then determines to carry out POS encapsulation to this IP datagram, otherwise, do not carry out POS encapsulation;
S306, if determine to carry out POS encapsulation, then carries out POS encapsulation to the IP datagram that deblocking takes on.
This embodiment is by achieving POS port and the intercommunication of ethernet port in PTN network to the decapsulation of PTN frame and the encapsulation of IP datagram.
Fig. 4 is the schematic flow sheet of another embodiment of the method for decapsulation PTN frame of the present invention.
As shown in Figure 4, this embodiment can comprise the following steps:
S402, judges whether the signal format that automatic network side joint is received is PTN frame;
S404, if not, then abandon received signal, otherwise perform S406;
S406, if the signal format that automatic network side joint is received is PTN frame, then carries out decapsulation to received signal;
S408, determines whether to carry out POS encapsulation according to the signal type after decapsulation, that is, judge whether signal type is IP datagram;
S410, if be IP datagram, then carries out POS encapsulation to the IP datagram that deblocking takes on, otherwise, directly signal is sent to user side.
One of ordinary skill in the art will appreciate that, realize the whole of said method embodiment to have been come by the hardware that program command is relevant with part steps, aforesaid program can be stored in a computing equipment read/write memory medium, this program is when performing, perform and comprise the step of said method embodiment, two aforesaid storage mediums can comprise ROM, RAM, magnetic disc and CD etc. various can be program code stored medium.
Fig. 5 is the structural representation of an embodiment of PTN device of the present invention.
As shown in Figure 5, the PTN device 50 of this embodiment can comprise SDH frame detecting unit 51, SDH frame processing unit 52 and PTN frame processing unit 53, SDH frame processing unit 52 is connected with PTN processing unit 53 with SDH frame detecting unit 51 respectively, PTN frame processing unit 53 is connected with SDH frame detecting unit 51, wherein
SDH frame detecting unit 51, for detect the SDH frame carrying of receiving from user's side joint type of service, according to type of service determination packaged type, send corresponding SDH frame according to the packaged type determined to PTN frame processing unit and SDH frame processing unit and receive signal that SDH frame processing unit and PTN frame processing unit send and be sent to user side, wherein, SDH frame carrying type of service can comprise IP datagram and non-IP datagram, packaged type can comprise to the payload in SDH frame carry out PTN encapsulation and directly PTN encapsulation is carried out to SDH frame;
SDH frame processing unit 52, for receiving SDH frame that SDH frame detecting unit sends, from SDH frame, deblocking takes on IP datagram, the IP datagram that taken on by deblocking is sent to PTN frame processing unit, receive IP datagram that PTN frame processing unit sends and carry out POS encapsulation to IP datagram and the signal after being encapsulated by POS is sent to SDH frame detecting unit;
PTN frame processing unit 53, for respectively PTN encapsulation is carried out to the SDH frame received and IP datagram and be sent to network side, the PTN frame received automatic network side joint carries out decapsulation, the signal type that takes on according to deblocking determines whether to carry out POS encapsulation, the IP datagram of determining to carry out POS encapsulation is sent to SDH frame processing unit and the signal of determining not carry out POS encapsulation is sent to SDH frame detecting unit.
This embodiment can realize the PTN encapsulation of SDH frame and the decapsulation of PTN frame.Particularly, the type of service be packaged into inside SDH frame PTN device being received by increase SDH frame detecting unit and SDH frame processing unit according to system configuration and detection judges, select suitable PTN packaged type, effectively to improve the efficiency of transmission of PTN in metropolitan area network.Meanwhile, this embodiment can also realize POS port and the intercommunication of ethernet port in PTN network.
In another embodiment, SDH frame detecting unit can also be used for judging whether the signal format received from user's side joint is SDH frame, if not, then abandon received signal, otherwise according to system configuration determination packaged type, if packaged type is directly encapsulation, then received SDH frame is sent to PTN frame processing unit, further, expense in all right treatment S DH frame of this unit (such as, REI (backward mistake instruction) is had in SDH frame head, whether wrong for indicating in circuit, Link State is judged) by reading this expense, to determine whether to transmit this signal.
In another embodiment, PTN frame processing unit can also be used for judging whether the signal format that automatic network side joint is received is PTN frame, if not, then abandon received signal, otherwise carry out corresponding decapsulation process.
Further, PTN device can also comprise interface adaptation unit, is connected, carries out adaptation processing for physical properties such as speed to received signal with SDH frame detecting unit.
In addition, PTN device can also comprise administrative unit, be connected with SDH frame detecting unit, SDH frame processing unit, PTN frame processing unit and interface adaptation unit respectively, for configuring the packaged type of SDH frame, and receive message be not SDH frame and/or PTN frame time carry out error message record.
The workflow of above-mentioned PTN device is as follows:
The PTN device of above-described embodiment, when processing user side signal, first through interface adaptation unit, carries out the adaptation processing of the physical properties such as speed to subscriber signal, signal after adaptation processing enters SDH frame detecting unit, whether be that correct SDH frame format detects to signal, if mistake, then report an error to administrative unit and abandon the signal received, whether searching and managing unit is configured to direct packaged type, if system configuration is direct packaged type, after then SDH frame overhead being processed, SDH frame is directly sent to PTN processing unit, if system configuration is non-immediate encapsulation, then the payload in SDH frame is detected, if payload is IP datagram, then SDH frame is sent to SDH frame processing unit, if payload be not IP datagram (now, SDH from common SDH port but not POS port), after then SDH frame overhead being processed, SDH frame is directly sent to PTN processing unit, PTN processing unit will be sent to after the signal entering SDH frame processing unit will be dressed up IP datagram by deblocking, the signal entering PTN processing unit will carry out corresponding encapsulation process according to type.
PTN device is when processing network side signal, first through PTN processing unit, whether be that correct PTN frame format detects to signal, if not PTN frame, then report an error to administrative unit and abandon signal, if PTN frame, then decapsulation process is carried out to this PTN frame, if the signal after decapsulation is IP datagram, be then sent to SDH frame processing unit, otherwise be sent to SDH frame detecting unit; The IP datagram entering SDH frame processing unit will be sent to SDH frame detecting unit after POS encapsulation process; The signal entering SDH frame detecting unit will carry out the detection of SDH frame, as being correct SDH frame, then SDH expense is processed to (SDH expense can detect Link State, therefrom extract link information), then be sent to interface adaptation unit, otherwise will report an error to administrative unit and abandon the signal received; The signal entering interface adaptation unit, by being carried out the adaptation processing of the physical properties such as speed, then sends from port.
In this specification, each embodiment all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, and part identical with similar between each embodiment can cross-reference.For device embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, relevant part can see the explanation of embodiment of the method part.
Although be described in detail specific embodiments more of the present invention by example, it should be appreciated by those skilled in the art, above example is only to be described, instead of in order to limit the scope of the invention.It should be appreciated by those skilled in the art, can without departing from the scope and spirit of the present invention, above embodiment be modified.Scope of the present invention is limited by claims.
Claims (9)
1. encapsulate a method for SDH frame, it is characterized in that, comprising:
Judge from the form of user's side receiving signal whether be SDH frame;
If be SDH frame from the form of user's side receiving signal, then judge whether the packaged type of system configuration is direct encapsulation;
If the packaged type of system configuration is directly encapsulation, then direct PTN encapsulation is carried out to received SDH frame;
If the packaged type of system configuration is not directly encapsulation, then detect the type of service of the SDH frame carrying of receiving from user's side joint, and according to described type of service determination packaged type;
If the packaged type determined according to described type of service is not POS encapsulation, then direct PTN encapsulation is carried out to described SDH frame;
If be POS encapsulation according to the packaged type that described type of service is determined, then from described SDH frame, deblocking takes on IP datagram, then carries out PTN encapsulation to described IP datagram.
2. method according to claim 1, is characterized in that, described method also comprises:
If be not SDH frame from the form of user's side receiving signal, then abandon received signal.
3. method according to any one of claim 1 to 2, is characterized in that,
Detect the type of service of the SDH frame carrying of receiving from user's side joint, and comprise according to the step of described type of service determination packaged type:
Whether the payload detected in SDH frame is IP datagram;
If the payload in SDH frame is not IP datagram, then determine that corresponding packaged type is not POS encapsulation;
If the payload in SDH frame is IP datagram, then determine that corresponding packaged type is POS encapsulation.
4. a method for decapsulation PTN frame, is characterized in that, comprising:
Whether the form judging automatic network side receiving signal is PTN frame;
If the form of automatic network side receiving signal is PTN frame, then carry out decapsulation to received signal;
Judge whether the signal after decapsulation is IP datagram;
If the signal after decapsulation is IP datagram, then POS encapsulation is carried out to the IP datagram that deblocking takes on;
If the signal after decapsulation is not IP datagram, then POS encapsulation is not carried out to the signal after decapsulation.
5. method according to claim 4, is characterized in that, described method also comprises:
If the form of automatic network side receiving signal is not PTN frame, then abandon received signal.
6. a PTN device, it is characterized in that, comprise SDH frame detecting unit, SDH frame processing unit and PTN frame processing unit, described SDH frame processing unit is connected with described PTN processing unit with described SDH frame detecting unit respectively, described PTN frame processing unit is connected with described SDH frame detecting unit, wherein
Described SDH frame detecting unit, for judge from the form of user's side receiving signal whether be SDH frame; If be SDH frame from the form of user's side receiving signal, then judge whether the packaged type of system configuration is direct encapsulation; If the packaged type of system configuration is directly encapsulation, then received SDH frame is sent to described PTN frame processing unit; If the packaged type of system configuration is not directly encapsulation, then detect the type of service of the SDH frame carrying of receiving from user's side joint, and according to described type of service determination packaged type; If be not POS encapsulation according to the packaged type that described type of service is determined, then received SDH frame is sent to described PTN frame processing unit; If be POS encapsulation according to the packaged type that described type of service is determined, then received SDH frame is sent to described SDH frame processing unit; Be sent to user side by from the signal after the POS encapsulation of described SDH frame processing unit, the signal from described PTN frame processing unit is sent to user side;
Described SDH frame processing unit, take on IP datagram for deblocking from the SDH frame from described SDH frame detecting unit, the IP datagram taken on by deblocking sends to described PTN frame processing unit; Also for carrying out POS encapsulation to the IP datagram from described PTN frame processing unit, the signal after being encapsulated by POS is sent to described SDH frame detecting unit;
Described PTN frame processing unit, for carrying out PTN encapsulation to the SDH frame from described SDH frame detecting unit and be sent to network side; IP datagram from described SDH frame processing unit is carried out to PTN encapsulation and is sent to network side; Also for judging whether the form of automatic network side receiving signal is PTN frame; If the form of automatic network side receiving signal is PTN frame, then carry out decapsulation to received signal; Judge whether the signal after decapsulation is IP datagram, if the signal after decapsulation is IP datagram, then the IP datagram that deblocking takes on is sent to described SDH frame processing unit; If the signal after decapsulation is not IP datagram, then directly signal after decapsulation is sent to described SDH frame detecting unit.
7. PTN device according to claim 6, is characterized in that, described SDH frame detecting unit also for when not being SDH frame from the form of user's side receiving signal, abandons received signal.
8. PTN device according to claim 6, is characterized in that, whether the payload that described SDH frame detecting unit specifically detects in SDH frame is IP datagram, if the payload in SDH frame is not IP datagram, then determines that corresponding packaged type is not POS encapsulation; If the payload in SDH frame is IP datagram, then determine that corresponding packaged type is POS encapsulation.
9. PTN device according to claim 6, is characterized in that, described PTN frame processing unit also for when the form of automatic network side receiving signal is not PTN frame, abandons received signal.
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