CN101572835A - Method and device for information transmission and control management on data link layer in layered order address packet network - Google Patents
Method and device for information transmission and control management on data link layer in layered order address packet network Download PDFInfo
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Abstract
The invention discloses a method for information transmission and control management on a data link layer in a layered order address packet network, which comprises: after information is received, the work mode of the information is judged, and the work mode comprises oriented connection and non-oriented connection; a corresponding work mode identifier is generated according to the judgment result, and the work mode identifier is packaged in an information frame and is born by a control field; and the packaged information frame is transmitted. The invention also discloses a device for information transmission and control management on the data link layer in the layered order address packet network, which realizes the control and management of the link layer in the layered order address packet network.
Description
Technical field
The present invention relates to stratification address packets network technology, relate in particular to the method and the device of the data link layer control and management in a kind of stratification address packets network.
Background technology
Development along with technology, telecommunications network has been finished smoothly by the transition of analogue technique to digital technology, (for example experienced again in the digital technology from circuit-switched technology, TDM) (for example to packet-switch technology, IP, ATM and FR) evolution process, carrying out at present introducing respectively at three kinds of packet-switch technologies (IP, ATM and FR) below by of the transition of TDM (Time-Division Multiplexing, time division multiplexing) technology to packet-switch technology.
The TDM technology is to the transition of ATM (Asynchronous Transfer Mode, asynchronous transfer mode) group technology, because technical difficulty is big and commercial operation is unsuccessful, and is unrealized.
The TDM technology is to IP (IP Protocol, the IP agreement) transition of group technology, since the typical case-the Internet of present networks be one free and open, the packet network that does not have unified management mechanism, its design concept is exactly free schema and non-profile business prototype, caused the dangerous of the Internet, trustless, lack management, service quality lacks assurance, make a lot of important commercial business nets, and quality of service requirement higher data interconnect services and real-time video traffic, can't guarantee that it is loaded into public IP safely and goes on the net, the IP group technology can not be born the responsibility telecommunications network by the important task of TDM technology to the group technology transition.
The TDM technology can't realize because facing numerous difficulties equally to FR (Frame Relay, frame relay) group technology transition.
For this reason, a kind of HSAPN network (Hierarchical and Sequential AddressPacket Network has appearred, hierarchy sequential address packet network), to realize by TDM (Time-DivisionMultiplexing, time division multiplexing) technology is applicable to that to the transition of packet-switch technology bearer network also can be applied in Access Network.This hierarchy sequential address Packet Based Network HSAPN is the Packet Based Network that is used for the telecommunications purpose, and it is used to carry the whole telecommunication services that existed already at present, and can guarantee that the telecommunication service of its carrying can provide and the professional same services quality of conventional telecommunications.It can carry Internet service, and the ability identical with existing the Internet is provided, and supports the present whole Internet services that existed already, and it can also be used to issuable from now on other business of carrying.
In realizing process of the present invention, the inventor finds to lack in the present stratification address packets network data link layer control and management mechanism, can't be to towards connecting and not providing effective support towards being connected two kinds of mode of operations.
Summary of the invention
The data link layer information in a kind of hierarchy sequential address packet network of the invention provides transmits and the method and the device of control and management, be applicable to hierarchy sequential address packet network, to realize to link layer control and management mechanism in the hierarchy sequential address packet network.
The objective of the invention is to be achieved through the following technical solutions:
The method of transmission of data link layer information and control and management in a kind of hierarchy sequential address packet network comprises:
Receive after the message, from described message, obtain (210) mode of operation information, judge the mode of operation of (210) described message according to described mode of operation information;
Mode of operation judging unit (91): receive after the message, from described message, obtain (210) mode of operation information, judge the mode of operation of described message according to described mode of operation information;
Encapsulation unit (93):, use towards connection identifier described message is packaged into towards the link information frame when the mode of operation of judging described message be during towards connection; When the mode of operation of judging described message for not when connecting, with described message not being packaged into not towards the link information frame, wherein, described towards connection identifier with do not pass through control field (42) and carry towards connection identifier towards connection identifier;
Transmitting element (94): send packed information frame.
The embodiment of the invention is by encapsulating message respectively towards connection or not towards connection identifier, make the hierarchy sequential address packet network seating surface to connection or not towards connecting mode of operation, and do not need to carry again N (S) and N (R), simplified the form of frame encapsulation and the management control process of data link layer.
Description of drawings
Fig. 1 is the networking structure schematic diagram of embodiment of the invention application scenarios;
Fig. 2 transmits the method flow diagram of control for embodiment of the invention data in link layer;
Fig. 3 is congested control of embodiment of the invention data link layer and flow control schematic diagram;
Fig. 4 is a frame structure schematic diagram in the embodiment of the invention;
Fig. 5 a is the logic channel swap table that first node is preserved in first kind of formation logic channel switch of embodiment of the invention table mode;
Fig. 5 b is the logic channel swap table that Section Point is preserved in first kind of formation logic channel switch of embodiment of the invention table mode;
Fig. 6 a is the logic channel swap table that first node is preserved in the third formation logic channel switch table mode of the embodiment of the invention;
Fig. 6 b is the logic channel swap table that Section Point is preserved in the third formation logic channel switch table mode of the embodiment of the invention;
Fig. 7 is a logical channel number information unit TLV schematic diagram in the embodiment of the invention; Fig. 8 is the schematic diagram of address field in the embodiment of the invention;
Fig. 9 is a data link layer management and control device structural representation in the embodiment of the invention;
The access control table that uses when Figure 10 embodiment of the invention is judged current IP message mode of operation;
Point-to-point tunnel foundation and point-to-multi-point tunnel are set up the schematic diagram of control signaling in Figure 11 embodiment of the invention.
Embodiment
Run through specification, the preferred embodiment that illustrates and example should be counted as example of the present invention and be not used in restriction protection scope of the present invention.
The application scenarios of the embodiment of the invention as shown in Figure 1, (for example comprise HSAPN net, packet switching network, IP network, ATM net or FR net) and boundary solid (E.D) equipment, E.D equipment and IP network, ATM net or FR Netcom letter are crossed by HSAPN Netcom, all devices and E.D equipment in the HSAPN net all are furnished with a HSAPN address, and all devices in the IP network and E.D equipment all are assigned the IP address.Because HSAPN net and IP network (with current application the most widely IP network be that example is described) the address different, also comprise address translation entity (ADT) in the HSAPN net, the mapping relations between IP address and the HSAPN address are kept in the interior address mapping table of ADT.The HSAPN net also comprise unified core layer by the control and management equipment control core router (Core Router, C.R), the couple in router of the convergence router (M.R) of convergence-level and Access Layer (Access Router, A.R).The HSAPN network is orderly hierarchical setting, and the network address system according to the structure HSAPN of region, stratification forms orderly address structure.Promptly can determine its position (being A.R, M.R, C.R etc.) in network according to the addressing of HSAPN apparatus for network node (R equipment).
As one embodiment of the present of invention, data in link layer is transmitted the method for control in a kind of hierarchy sequential address packet network, as shown in Figure 2:
210, receive after the message, from message, obtain mode of operation information, judge the mode of operation of described message, promptly towards connecting mode of operation or not towards connecting mode of operation according to described mode of operation information.
For different situations, the mode of operation information of obtaining also has nothing in common with each other: can obtain the Business Stream information of IP grouping message and judge according to the access control table when received message is IP grouping message (from the IP operation net) and take connection-oriented mode of operation or not connection-oriented mode of operation (the method is applicable to the edge device of hierarchy sequential address packet network, ED equipment for example), when the message that receives is two layers of information frame of HSAPN, can obtain the work mode identifier of two layers of information frame, two layer identifiers (promptly towards connection identifier or not towards connection identifier) according to this information frame judge that (the method is applicable to the intermediate equipment of hierarchy sequential address packet network to its mode of operation, AR for example, MR and CR), introduce in detail respectively below:
(1), when received message is IP grouping message, the mode of operation information of obtaining from message is exactly the Business Stream information of IP grouping message and judges according to the access control table and to take the still not connection-oriented mode of operation of connection-oriented mode of operation.
Business Stream information includes but not limited to the upper-layer protocol of IP packet bearer or the destination address information of IP grouping, can be these Business Stream information distribution priority, priority can be with numeral for example 0～3, the priority of the more little expression of numeral is high more, for example the destination address priority of distributing IP grouping is 0, the upper-layer protocol priority of IP packet bearer is 1, can obtain successively according to this priority when obtaining the Business Stream information of IP grouping message;
The access control table can also can be divided into groups dynamically to form and revise when message is transmitted by network manager's manual configuration at IP, and the access control table comprises access information and mode of operation two parts content; The value of access information part can be that (traffic flow types can be definitely to guarantee resource-type " 00 " expression to traffic flow types, the absolute appointment data speed type that guarantees is represented with " 01 ", according to ratio the resource multiplex type is represented with " 10 ", the type of doing one's best is with " 11 " expression) or the upper-layer protocol of IP address (comprising host IP address and network segment IP address) or IP packet bearer (TCP for example, UDP etc.) or default value (for an IP grouping of receiving, if there is not corresponding list item correspondence in the access control table, then can use the mode of operation of this default value indication, represent) with Default;
The value of mode of operation part can be towards the connection mode of operation or not towards connecting mode of operation;
The mode of operation of above-mentioned several access information type correspondences can be decided according to concrete condition, for example can determine to adopt towards connecting the mode of operation transmission during for Transmission Control Protocol when the upper-layer protocol of this IP grouping message carrying; When the upper-layer protocol of this IP grouping message carrying can determine to adopt not connection-oriented mode of operation during for UDP.
The instantiation of access control table as shown in figure 10.
Describe the process of judging described message mode of operation in detail below in conjunction with above-mentioned access control table:
When receiving IP grouping message, it is the highest at first to obtain the Business Stream information medium priority of this IP grouping message according to the priority of definition, for example the destination address of IP grouping; Whether have corresponding list item, take which kind of mode of operation if having then judge according to this list item mode of operation value partly if obtaining the access information part of judging the access control table in the back, be to take not connection-oriented mode of operation herein; If do not have corresponding list item then can obtain the lower Business Stream information of this IP grouping message priority according to the priority of definition, whether the access information part of judging the access control table has corresponding list item, if not would continue this process up to obtained Business Stream information medium priority minimum and judge and do not have a list item correspondence, then can judge and take which kind of mode of operation according to the value of Default list item mode of operation part, be to take not connection-oriented mode of operation herein, maybe can refuse to transmit this IP grouping, by the network management grouping information that this IP divides into groups is sent to network management entity simultaneously, or generate corresponding list item according to the dynamic formation method of access control table, add in the access control table, and take which kind of mode of operation according to the list item judgement of adding.
The dynamic creation method of access control table can dynamically generate according to the strategy that sets in advance.The strategy that sets in advance is provided with by the network manager, decides according to concrete condition.
The access control table can also on-the-fly modify, for example, when the transmission path in the HSAPN network takes place when congested, ED equipment can be received the congestion alarm message, and the Business Stream on this transmission path switched on the backup path, message on the backup path is by towards connected mode transmission, therefore can be before active-standby path switches with the access control table in therewith the mode of operation of the corresponding list item of Business Stream partly be modified as towards connection.
(2), when received message is two layers of information frame of HSAPN, what obtain mode of operation information from message is exactly two layer identifiers of this information frame, two layer identifiers (promptly towards connection identifier or not towards connection identifier) according to this information frame are judged, for example, when received message is two layers of information frame, can in the process of decapsulation, obtain two layer identifiers (promptly towards connection identifier or not towards connection identifier), when two layers of information frame being received have adopted not when connection identifier encapsulates, then need with grouping not being encapsulated towards connection identifier, when two layers of information frame being received have adopted when connection identifier encapsulates, then need to use grouping is encapsulated towards connection identifier.
220, with work mode identifier (towards connection identifier or not towards connection identifier) encapsulation messages.Be specially, when being judged as, use towards connection identifier described message is packaged into towards the link information frame towards connection; When being judged as not when connecting,, wherein, described towards connection identifier with do not carry by control field towards connection identifier with described message not being packaged into not towards the link information frame towards connection identifier.
230, send two layers of packed information frame.When information frame is when connecting, transmit this information frame by the bilaminar logic channel.When information frame is not when connecting, transmit these information frames by three layers, for example, obtain next hop address according to the HSAPN destination address and transmit.
Wherein,,, also encapsulate logical channel number, work as the first two layer information frame with this logic channel transmission except using towards three layers of grouping message (being IP grouping message or three layers of grouping of PTSN messages) that the connection identifier encapsulation is received when the information frame in 230 is when connecting.At this moment, this method also comprises the step of obtaining logical channel number, for example, searches the logic channel swap table, obtains out logical channel number.The generation of logic channel swap table can be consulted to distribute by upper-layer protocol, also can (for example, call) generate when call setup.Below the mode of consulting to distribute by upper-layer protocol is introduced in detail:
Consult distribution by upper-layer protocol and generate the logic channel swap table, described upper-layer protocol can carry by information frame, all positions in the address field of this information frame all are changed to " 0 ", the value that is logical channel number is " 0 ", the value that keeps the position is changed to " 0 ", the value of OAM stream is changed to " 0 ", the value of FECN is changed to " 0 ", the value of BECN is changed to " 0 ", upper-layer protocol can be RSVP (Resource Reservation Protocol), RSVP-TE (resource reservation setup protocol with traffic-engineeringextensions) or Q.931 improve agreement and (be used for realizing the controlled function that HSAPN is relevant, for example, the control of VPN point-to-point tunnel is set up, multicast point-to-multi-point tunnel control foundation etc.) or the like.Agreement realizes by improving Q.931 in the present invention.Can adopt in following four kinds of solutions any one to generate the logic channel swap table during specific implementation, in order to make the embodiment of the invention clearer, with two adjacent nodes is the example explanation, below use first node and Section Point to describe, wherein, Section Point is next jumping of first node:
The realization that point-to-point tunnel in the HSAPN network (as VPN) is set up and point-to-multi-point tunnel (as multicast) is set up the control signaling generally includes following message and finishes: the tunnel sets up that order (message), tunnel are set up response (message), set up progress order (message), the tunnel is revised and ordered (message) etc., and setting up process with VPN shown in Figure 11 below is the course of work that example illustrates above-mentioned message:
First node is received when VPN sets up order, send the tunnel to Section Point and set up order, Section Point receives that this order back is according to the corresponding operation of information unit execution of carrying in the tunnel foundation order, send to first node simultaneously and set up the progress order, and to the foundation order of the 3rd node transmission tunnel, say in the embodiment of the invention to send to set up to make progress to order and be applied to NNI side (Network Network Interface, Network-Network interface); The 3rd node is received this order back according to the corresponding operation of information unit execution of carrying in the tunnel foundation order, and the while sends the order of foundation progress to Section Point, if the 3rd node is a destination node, then the 3rd node is set up to Section Point transmission tunnel and responded; Section Point is received after response is set up in the tunnel and is carried out corresponding the operation according to tunnel foundation response, and sets up response to first node transmission tunnel; First node receives after response is set up in the tunnel and carries out corresponding operation that this moment, the tunnel was set up successfully.
All in the HSAPN scope, for example first node and the 3rd node can be the ED nodes for first node, Section Point and the 3rd node herein, and Section Point can be middle HSAPN router.
First kind: give first node assignment logic channel number by Section Point by setting up progress order (for example, Call proceeding) or tunnel foundation response (for example, Connect order).For example, Section Point (is for example received tunnel foundation order, the Setup order) afterwards, feedback is set up the progress order, in this foundation progress order, carry the logical channel number 4027 (decimal systems, the value of logical channel number can be 0 to 1048576), this logic channel of notice first node Section Point can be used as going into logic channel.First node and Section Point are preserved the logical channel information to this information frame, and the logic channel swap table that first node and Section Point can be preserved is respectively shown in Fig. 5 a and Fig. 5 b.
When first node was source node, because the logical channel number swap table can generate when VPN sets up, this moment, table one was gone into the HSAPN address that logical channel number is VPNID or destination; The logical channel number swap table also can be generated by call control protocol when call setup (for example, call), this moment the logical channel number swap table go into the HSAPN address of logical channel number for the callee.When the next-hop node of Section Point and its oneself was set up the point-to-point logical connection, " going out logical channel number " list item in the table two just can be added went out logical channel number accordingly.
Can revise order Modify by the tunnel after above-mentioned logic channel swap table is set up revises, the Modify order is mainly used in makes amendment to the resource of VPN, when adopting the mode of setting up switching more in advance to revise the VPN resource, promptly rebulid a VPN and distribute corresponding resource again the Business Stream on the former VPN to be switched on the newly-established VPN, the method of using the Modify order to revise the logic channel swap table orders the method for setting up the logic channel swap table identical with adopting Setup, no longer is repeated in this description at this.
Second kind: set up order by the tunnel and give Section Point assignment logic channel number by first node.For example, first node is set up order (for example, carry the logical channel number that distributes into Section Point in Setup), Section Point is received that the tunnel sets up after the order, can use this logic channel to send information frame to first node in the tunnel.Further, can also judge whether available after the Setup order that Section Point is received to the logical channel number that is distributed, if it is available then in the foundation progress order that first node sends, carry affirmation to this logical channel number at Section Point, if it is unavailable then produce new logical channel number and in the foundation progress order that first node sends, carry this new logical channel number at Section Point according to local principle, first node is received this logical channel number of back preservation, and use during exchanges data afterwards, concrete content of preserving is referring to first kind description.
Below either way be to set up the one-way transmission route method towards connecting under the mode of operation, in the practical application, it also is very common setting up bidirectional transmission path, and bidirectional transmission path can transmit data simultaneously at both direction, introduces the method for setting up bidirectional transmission path below.
The third: order (for example, Call proceeding) to cooperate the assignment logic channel number by tunnel foundation order (for example, Setup order) and foundation progress.For example, first node is after the tunnel foundation order of receiving from the upstream, the destination address that foundation provides in ordering according to the tunnel is judged this tunnel foundation order is transmitted to Section Point, carrying first node in this order is the logical channel number 3000 that Section Point distributes, and this logic channel is as the logic channel that goes out of going into logic channel and Section Point of first node.First node and Section Point are also preserved logical channel number 3000 going into logic channel and going out logic channel as information frame respectively.Section Point sends to first node and sets up the progress order, and carrying by Section Point is the logical channel number 3001 that first node distributes, and this logic channel is as the logic channel that goes out of going into logic channel and first node of Section Point.Section Point and first node are preserved logical channel number 3001 going into logic channel and going out logic channel as information frame respectively.At this moment, the logic channel swap table of first node and Section Point preservation is gone into respectively shown in Fig. 6 a and Fig. 6 b;
The 4th kind: set up response (for example, Connect orders) by tunnel foundation order (for example, Setup order) and tunnel and cooperate assignment logic channel number.For example, first node is judged according to the destination address that provides in the tunnel foundation order this tunnel foundation order is transmitted to Section Point, and carrying the logical channel number 4000 that first node produces according to local principle, this logic channel is as the logic channel that goes out of going into logic channel and Section Point of first node.First node and Section Point are preserved logical channel number 4000 respectively as going into logic channel and going out logic channel, hop-by-hop is transmitted the tunnel downstream and is set up order, after destination node receives that order is set up in the tunnel, upstream feed back the tunnel from the destination node hop-by-hop and set up response, this tunnel is set up and is carried the logical channel number 4001 that Section Point distributes to first node in the response, after first node receives that response is set up in the tunnel, what obtain first node goes out logical channel number 4001, and Section Point and first node are preserved logical channel number 4001 respectively as going into logic channel and going out logic channel.
The generation method of above-mentioned four kinds of logic channel swap tables, specifically can realize: for example by the information unit that in the message of agreement Q.931, increases logical channel number, set up order Setup message in the tunnel, set up progress order Call Proceeding message, response Connect message is set up in the tunnel or the information unit that increases the description logic channel number in the order Modify message is revised in the tunnel, with reference to shown in Figure 7, this information unit can adopt the mode of TLV to describe: comprise logical channel number information unit sign 71, logical channel number information unit content-length 72 and logical channel number 73.
Above-mentioned information frame is transmitted in the process of control, the embodiment of the invention provides the method for the congested control of data link layer and flow control in a kind of hierarchy sequential address packet network simultaneously, decomposes below and introduces:
Under connection mode, congested control and flow control realize to the congested indication of demonstration after showing congested indication FECN/ by the forward direction in control frame (for example, monitor command frame RR) and the information frame.Wherein, the RR frame is used to refer to the preparation that data receiver has been carried out the receiving data information frame, when no frame receives, data receiver (for example can start a timer, 5 seconds), data receiver sent RR frame designation data receiving terminal to data sending terminal and has carried out the preparation that receives data when timer expired, and the time interval of representing to send the RR frame when the value of timer during for " 0 " is an endless, promptly need not to send RR frame notice transmit end receive end and has carried out the preparation that receives data.When taking place the forward direction in the information frame to be shown that congested indication FECN puts 1 and sends to next jumping when congested on the sending direction of frame, be illustrated in taken place on the sending direction of frame congested; When taking place on the rightabout that frame sends when congested, back with in the information frame to showing that congested indication puts 1 and send to a last jumping, be illustrated in taken place on the rightabout of frame transmission congested.During specific implementation, as shown in Figure 3, at first introduce, congested control and flow control under the connection mode, wherein,
310, first node sends logical connection to Section Point and sets up command frame, and logical connection is set up in request, and wherein, Section Point is next jumping of first node.This logical connection is set up and is carried controlling links identifier (link establishment command id) in the command frame;
320, after Section Point is received this command frame, directly send the success response frame to first node, this logical connection is set up and is carried controlling links identifier (success response sign) in the command frame, the logical connection of data link layer is successfully set up, Section Point is no longer safeguarded V (S), V (R) and V (A) variable, for example, because no longer safeguard, Section Point does not need the V (S) to local maintenance naturally yet, V (R) and V (A) set are (wherein, V (S): two end points of each point-to-point logical connection all will have a relevant V (s), N (S)=V (S) is set when sending information frame, the sequence number of the next information frame that will send of expression, its value is from 0 to n-1, and maximum can not surpass V (A), and the value of an information frame V of every transmission (s) just adds 1; V (R): two end points of each point-to-point logical connection all will have a relevant V (R), N (R)=V (R) is set when sending information frame and monitoring frame, the sequence number of the information frame that the next expectation of expression is received, its value is from 0 to n-1, receives that whenever the information frame that an errorless N (s) value equals V (R) then adds 1 with V (R) value; V (A): two end points of each point-to-point logical connection all will have a relevant V (A), the numbering of the last information frame that expression can be confirmed by the opposite end).Above-mentioned steps belongs to logical connection and sets up process.Whether no matter be connection-oriented, first node all needs to set up the point-to-point logical connection of data link layer with Section Point.
330, first node is not safeguarded V (S), V (R) and V (A) variable yet, first node is received after the success response frame, do not need V (S), V (R) and V (A) set to local maintenance, directly transmit data, promptly first node sends towards link information frame a to Section Point;
340, Section Point receives towards link information frame a, if first node does not send the follow-up frame afterwards, if Section Point can continue to receive data, (for example then start timer, 5 seconds), timer then, Section Point transmitting monitoring command frame RR, carry the supervision identifier among this monitor command frame RR, the notice first node can continue to receive follow-up towards the link information frame; Section Point is received behind link information frame a herein, adopt the still not connection-oriented transmission mode of connection-oriented transmission mode according to judging in the link information frame towards connection identifier, and in the prior art, Section Point judges by the N (S) that carries in the information frame whether this information frame can receive after receiving information frame, monitor frame REJ (Reject) if cannot receive then return, if can receive then accept this information frame.Those of ordinary skills can know beyond all doubtly that this step is optional.
If 350, first node also has follow-uply towards the link information frame, then continue to send towards link information frame b;
360, continue to send towards link information frame c;
370, congested when the Section Point generation, the notice first node has taken place congested.Can carry in this information frame towards connection identifier and congested control indication information by realizing of sending towards the link information frame because be on the transmission rightabout of frame, taken place congested, will be to showing that congested control indication BECN be changed to 1 behind this information frame; After first node was received, reading BECN was 1, and it is congested to know that Section Point takes place, and stopped to send towards the link information frame; In like manner, if Section Point find to jump with its own next between generation congested, promptly on the sending direction of frame, taken place congestedly, the congested indication FECN of the demonstration of the forward direction in the information frame can be put 1 and send to next jumping; This step belongs to congested control;
380, after the Section Point releasing is congested, the notice first node can continue to send data, can realize by transmitting monitoring command frame RR, carry the supervision identifier among this monitor command frame RR, the notice first node can continue to receive follow-up towards the link information frame; This step belongs to flow control;
If 390, first node also has follow-uply towards the link information frame, then continue to send towards link information frame d.
Above-mentioned is congested control and flow control under the connection mode, and under not connection-oriented pattern, congested control realizes by upper layer application that then flow control also can notify two layers to use the RR frames to realize by upper layer application.
Error control in the embodiment of the invention is mainly realized by frame reject frame FRMR, control field in the frame that the frame recipient receives is invalid or information field is long, in the time of can't passing through to retransmit correct wrong, the frame recipient should be to frame transmit leg transmit frame reject frame, the frame transmit leg should disconnect logical connection after receiving this frame, and rebulids logical connection.
Above-mentioned error control, congested control and flow control be order in no particular order.
In the embodiment of the invention towards connection identifier, do not set up the controlling links identifier in the process and monitor that identifier can carry by control field towards connection identifier, logical connection, give different values for each identifier, at first, introduce the frame structure of the embodiment of the invention: as shown in Figure 4, the frame structure of the embodiment of the invention can be made up of attribute field 41 (1 byte), control field 42 (1 byte), information field 44 and Frame Check Sequence field 45 (2 bytes) etc.
(1) attribute field 41: attribute field is 01111110 bit mode, in order to the termination of the initial sum former frame of marker frames.Attribute field also can be used as filling character between frame and the frame.Usually, do not carrying out the moment that frame transmits, channel still is in state of activation, and in this state, originating party constantly sends attribute field, can think that just a new frame transmission begins.Adopt " 0 bit insertion " can realize the O transparent data transmission.
(2) control field 42: control field can be used to constitute various command and response, so that link is monitored and controls.Transmit leg utilizes control field to notify the opposite end to carry out the operation of agreement; On the contrary, the variation of completed operation or state is reported with the oppose response of order of this field in the opposite end.The embodiment of the invention is improved control field, for example, control field takies 1 byte, is used to carry work mode identifier, be identified surface to connection identifier or not towards connection identifier, also can be used for the bearing link control identifier or monitor identifier.When control field is during towards connection identifier or not towards connection identifier, the sign present frame is an information frame, otherwise, be control frame.
(3) information field 43
Information field can be a binary bits string arbitrarily.Bit String length satisfies the integral multiple requirement of eight hytes, and its maximum length is determined by logic channel business parameters data unit, and minimum length can be 0, does not promptly have information field.Logic channel business parameters data unit is to be provided when setting up VPN by upper-layer protocol (for example, VPN sets up agreement), and the information in this information unit comprises maximum frame size, throughput and the minimum throughput accepted.
(4) Frame Check Sequence FCS field 44
The Frame Check Sequence field can be used 16 CRC, and the content of the entire frame between two attribute fields is carried out verification.
(5) towards connecting under the mode of operation, the frame of the embodiment of the invention can also comprise an address field, and this address field both can be in the information field of link information frame, also can be after control field with control field jointly as frame head information.The embodiment of the invention is improved address field, be specially, as shown in Figure 8, address field length is 24bit, comprise logical channel number DLCI81 (20bit), keep position 82 (1bit), OAM stream 83 (Operations, Administration and Maintenance streams, 1bit), FECN84 (forward direction shows congested indication, 1bit) and BECN85 (back is to showing congested indication, 1bit).Wherein, logical channel number DLCI is used for identifying the logic channel of transmission when the first two layer information frame, and logical channel number only has local significance.OAM stream is used for identifying the OAM frame, and if this bit position 1 the expression this frame be the OAM frame, if put 0 the expression this frame be information frame.Everybody generally puts 0 in the address field of control frame.
Control and management method below in conjunction with the embodiment of the invention is described in further detail control field.When control field is used to carry work mode identifier, promptly be used to identify the mode of operation of current information frame.Work mode identifier is used for identified surface to connection or not towards connection, be used for representing that packed three layers of grouping message adopt connection-oriented mode to transmit, still not connection-oriented mode is transmitted, give towards connection identifier (CID with do not give different values towards connection identifier (CID, for example, when packed three layers of grouping message adopt connection-oriented mode to transmit, can control field be set to 00000000, when packed three layers of grouping message adopt connection-oriented mode to transmit, can control field be set to 00000011.The embodiment of the invention is only stamped in the control field of information frame towards connection identifier or not towards connection identifier, do not need to carry again N (S) and N (R), N (S) is used to deposit the transmit frame sequence number, so that transmit leg needn't wait acknowledge and is sent multiframe continuously, N (R) is used to deposit the sequence number of the frame that the next expection of recipient will receive, distinguishing towards connecting and the not connection-oriented while, simplifying the form of frame encapsulation and the management control process of data link layer.
When control field is used for the bearing link control identifier, be used to set up the logical connection of data link layer, point-to-point communications status is controlled and is managed, the controlling links command identifier comprise link set up command id (for example: 01111111), link remove command id (for example: 01010011), the success response sign (for example: 01110011), the failure response sign (for example: 00011111) and frame reject (for example: 10010111) identify.Wherein, it is the link establishment command frame that the link establishment command id is used to identify current control frame, for example just carry the link establishment command id in the link establishment command frame in 310, set up point-to-point logical connection by this command frame request, the information frame load mode that this link is set is an Asynchronous Balanced Mode, and the recipient removes all abnormalities after receiving this command frame; The success response sign is used to identify the success response frame, for example just carry the success response sign in the success response frame in 320, remove command frame successful execution post command receive direction order initiator when link establishment command frame or link and send the success response frame, the initiator receives after the success response message that the point-to-point logical connection of expression is set up success or logical connection is successfully removed; Link is removed command id and is used to identify link dismounting command frame, can remove point-to-point logical connection by this command frame, and abort frame was operated after the recipient received this command frame; The failure response sign is used to identify the failure response frame, can be to ordering the initiator send failure response message when the side refusal of receiving link establishment order or link dismounting order is set up logical connection or refused to remove logical connection; Frame reject sign is used for identification frames refusal command frame, exists when wrong when the recipient finds the information frame of receiving, has for example received that the length of undefined order or information is incorrect etc., and information frame receive direction transmit leg sends this frame.The embodiment of the invention only is provided with corresponding sign in the control field of control frame, two end points of each point-to-point logical connection are all no longer safeguarded V (S), V (R) and three variablees of V (A), have effectively simplified operation.And, because the link control frame in the embodiment of the invention does not comprise address field, so, node is after receiving the response of failure response frame, do not need assignment logic channel DLCI, need not to enter TEI (Terminal EndpointIdentifier, terminal endpoint identifier) distribution state yet.
When control field is used for carrying supervision identifier, (for example: 00010001) be used for identifying the monitor command frame that present frame is a control frame, whether the monitor command frame is used to indicate link ready, for example just carry this supervision identifier among the monitor command frame RR in 340, also can be used for flow control, for example, also carry this supervision identifier among the monitor command frame RR in 380.Control field in the monitor command frame is used to carry above-mentioned supervision identifier.
It is the example explanation that the embodiment of the invention only takies 1 byte with control field, and provided the numerical value of every type of identifier, during specific implementation, the concrete numerical value of the length of control field and identifier can not be subjected to above-mentioned restriction, as long as can identify the purposes of two layers of frame, and the equipment in the network can be discerned mutually and gets final product.
The embodiment of the invention also provides a kind of equipment of data link control and management, comprising:
Mode of operation judging unit 91: receive after the message, judge the mode of operation of described message, promptly towards the connection mode of operation or not towards connecting mode of operation;
Encapsulation unit 93:, use towards connection identifier described message is packaged into towards the link information frame when the mode of operation of judging described message be during towards connection; When the mode of operation of judging described message for not when connecting, with described message not being packaged into not towards the link information frame, wherein, described towards connection identifier with do not pass through control field (42) and carry towards connection identifier towards connection identifier;
Transmitting element 94: send two layers of packed information frame.
This equipment can also comprise that memory cell 95 and logic channel search unit 96, and memory cell 95 is used for stored logic channel switch table, and when information frame is when connecting, logic channel is searched unit 96 and searched the logic channel swap table and obtain logical channel number;
This equipment can also comprise congested control unit 97, when generation is congested, generation is towards connection identifier and congested indication information, encapsulation unit 93 is encapsulated into it in information frame, transmitting element 94 sends and takes place congested towards link information frame notice, wherein, in connection identifier carrying control field, congested indication information is carried on BECN or the FECN in the address field;
This equipment can also comprise flow controlling unit 98, when remove congested after, generate and monitor sign, encapsulation unit 93 uses and monitors that sign encapsulated frame, transmitting element 94 transmitting monitoring command frame RR are notified and congestedly remove, wherein, monitors that sign is carried in the control field.
During specific implementation, the equipment of the data link control and management of mentioning in the foregoing description can be core router (the Core Router of core layer among the hierarchy sequential address packet network HSAPN, C.R), the couple in router of the convergence router (M.R) of convergence-level, Access Layer (Access Router, A.R) or boundary solid E.D.This equipment can be source node, intermediate node or the destination node on the point-to-multi-point tunnel.
The embodiment of the invention is by judging the mode of operation of message, encapsulating face is to connection or not towards connection identifier respectively, make the hierarchy sequential address packet network seating surface to connection or not towards connecting mode of operation, and do not need to carry again N (S) and N (R), simplified the form of frame encapsulation and the management control process of data link layer.
The embodiment of the invention decides the load mode of Business Stream in the HSAPN network (towards connecting or non-towards connecting mode of operation) by the access control table, and carries out the frame encapsulation of relevant work pattern, the perfect implementation of existing HSAPN.Because can the access control table be set according to different demands, strategy, make scheme more flexible.
The embodiment of the invention can be carried logic channel and congested control indication information information such as (for example, FECN and BECN) by extended address field, makes congested control and flow control simplify.
The embodiment of the invention is set up in the process at the link layer point-to-point link, after Section Point is received the link establishment command frame, if accept this order remove all abnormalities, feedback success response frame, the management controlling mechanism of reduced data link layer, and the controlling links command frame can not comprise address field, has effectively simplified frame format.
Control field in the embodiment of the invention can be carried work mode identifier, controlling links identifier simultaneously and be monitored identifier, and work mode identifier, controlling links identifier and supervision identifier all are fixed values, effectively unify, simplified frame format.
The embodiment of the invention realizes the distribution of logical channel number and the foundation of respective logical channels swap table by designing four kinds of schemes, perfect connection-oriented programme of work in the existing HSAPN network, and will be Q.931 the application of agreement from UNI side (User Network Interface, user-network interface) expands to NNI side (Network Network Interface, Network-Network interface), the scope of application and the function of agreement on the basis of improving former protocols having, have been expanded.
The computer-readable medium of the embodiment of the invention can be the medium that comprises, stores, passes on, propagates or transmit computer program, described computer program is the program of use instruction with operation system and device, system or equipment that the embodiment of the invention was provided, or the program relevant with this instruction.This computer-readable medium can be electronics, magnetic, electromagnetism, optics, infrared or semi-conductive system, device, equipment, propagation medium or computer storage.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (17)
1. data link layer information transmits and the method for control and management in the hierarchy sequential address packet network, it is characterized in that, comprising:
Receive after the message, from described message, obtain (210) mode of operation information, judge the mode of operation of (210) described message according to described mode of operation information;
When the mode of operation of judging described message be when connecting, to use towards connection identifier described message is encapsulated (220) one-tenth towards the link information frame, transmission (230) is described towards the link information frame; When the mode of operation of judging described message for not when connecting, with towards connection identifier described message not being encapsulated (220) one-tenth not towards the link information frame, transmission (230) is described not towards the link information frame.
2. method according to claim 1, it is characterized in that, when using when described message being encapsulated (220) and becomes towards the link information frame towards connection identifier, also encapsulate logical channel number in the described information frame, wherein, described logical channel number is by the carrying of the logical channel number territory (81) in the address field (420).
3. method according to claim 2 is characterized in that, described method comprises that also searching the logic channel swap table obtains logical channel number.
4. method according to claim 3 is characterized in that, described logic channel swap table is consulted to distribute by upper-layer protocol and generated, and comprises the logical channel number information unit in the message that described upper-layer protocol is consulted.
5. method according to claim 4 is characterized in that, when described upper-layer protocol when Q.931 improving agreement, described logic channel swap table consults to distribute the concrete steps that generate to comprise by upper-layer protocol:
Set up response assignment logic channel number by setting up progress order or tunnel; Perhaps,
Set up the call allocation logical channel number by the tunnel; Perhaps,
Set up order and set up progress order assignment logic channel number respectively by the tunnel; Perhaps,
Set up order and tunnel foundation response difference assignment logic channel number by the tunnel.
6. method according to claim 5 is characterized in that, described logical channel number information unit adopts the TLV mode: comprise logical channel number information unit sign (71), logical channel number information unit content-length (72) and logical channel number (73).
7. method according to claim 1 is characterized in that, described (210) the mode of operation information of obtaining from described message judges that according to described mode of operation information the step of the mode of operation of (210) described message specifically comprises:
When the described message that receives is Internet Protocol (IP) grouping message, from described IP grouping message, obtain IP grouping message traffic stream information, be keyword search access control table with described Business Stream information, obtain the mode of operation of described message; Perhaps,
When the described message that receives is two layers of information frame, from described two layers of information frame, obtain work mode identifier, judge the mode of operation of described message according to described work mode identifier.
8. method according to claim 7 is characterized in that, described access control table comprises access information and mode of operation, and wherein access information comprises the upper-layer protocol and the default value of traffic flow types, IP address, IP packet bearer; Mode of operation comprise towards connect mode of operation with not towards being connected mode of operation.
9. according to any described method of claim 1-8, it is characterized in that this method also comprises: jump to next and send the link establishment command frame, described next jumping is directly fed back the success response frame after receiving described link establishment command frame.
10. method according to claim 9, it is characterized in that, when generation is congested, transmission is carried towards connection identifier and congested control indication information towards this information frame of link information frame, congested control indication information comprises that forward direction shows congested control indication and indicates BECN to the congested control of demonstration, carries by address field.
11. method according to claim 10 is characterized in that, behind relieve congestion, transmitting monitoring command frame notice is carried the supervision identifier among this monitor command frame RR, and described supervision identifier carries by control field.
12. method according to claim 9 is characterized in that, and is described towards connection identifier be not fixed value towards connection identifier, by control field (42) carrying, described control field (42) is 1 byte; Described address field is 3 bytes, and the logical channel number in the address field (81) is 20.
13. data link layer information transmits and the device of control and management in the hierarchy sequential address packet network, described device is positioned at hierarchy sequential address packet network, it is characterized in that, this device comprises:
Mode of operation judging unit (91): receive after the message, from described message, obtain (210) mode of operation information, judge the mode of operation of described message according to described mode of operation information;
Encapsulation unit (93):, use towards connection identifier described message is packaged into towards the link information frame when the mode of operation of judging described message be during towards connection; When the mode of operation of judging described message for not towards connection the time, with described message not being packaged into not towards the link information frame towards connection identifier;
Transmitting element (94): send packed information frame.
14. device according to claim 13, it is characterized in that, this device comprises that also memory cell (95) and logic channel search unit (96), memory cell (95) is used for stored logic channel switch table, when information frame is when connecting, logic channel is searched unit (96) and is searched the logic channel swap table and obtain logical channel number.
15. device according to claim 13, it is characterized in that, this device also comprises congested control unit (97), when generation is congested, generate towards connection identifier and congested indication information, encapsulation unit (93) is encapsulated into it in information frame, transmitting element (94) sends and takes place congested towards link information frame notice, wherein, in connection identifier carrying control field, congested indication information is carried on BECN or the FECN in the address field.
16. device according to claim 15, it is characterized in that, this device also comprises flow controlling unit (98), after releasing is congested, generate to monitor sign, encapsulation unit (93) uses and monitors that sign encapsulated frame, transmitting element (94) transmitting monitoring command frame RR are notified and congestedly remove, wherein, monitor that sign is carried in the control field.
17., it is characterized in that this device is the core router of the core layer in the hierarchy sequential address packet network, the convergence router of convergence-level, the couple in router or the boundary solid of Access Layer according to any described device of claim 13-16.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100670436A CN101572835A (en) | 2008-04-30 | 2008-04-30 | Method and device for information transmission and control management on data link layer in layered order address packet network |
| PCT/CN2008/073669 WO2009132500A1 (en) | 2008-04-30 | 2008-12-24 | Method and device for data link layer information transmission and control management in hierarchical and sequential address packet network |
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| CNA2008100670436A CN101572835A (en) | 2008-04-30 | 2008-04-30 | Method and device for information transmission and control management on data link layer in layered order address packet network |
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| WO2009132500A1 (en) | 2009-11-05 |
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