CN102237962B - Internet protocol (IP) telecommunication network-oriented link frame encapsulation method - Google Patents
Internet protocol (IP) telecommunication network-oriented link frame encapsulation method Download PDFInfo
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Abstract
The invention discloses an Internet protocol (IP) telecommunication network-oriented link frame encapsulation method. The method comprises that: a communication entity sets a value of a control field according to the type of a link frame, thereby determining the link frame to be one of an information frame, a link control frame and a link maintenance frame; when the link frame is determined to be the information frame in a connection-oriented operating mode, the communication entity continues filling a logic channel identifier, an operation, administration and maintenance (OAM) identifier and a traffic control indicator of the information frame into an information field, and the information field bears a data packet of a network layer; and when the link frame is determined to be the information frame in a connection-unoriented operating mode, the information field only bears the data packet of the network layer. A link frame structure realized by the encapsulation method can realize a link control function, a link maintenance function, a link testing function and an upper-layer data packet bearing function in an IP telecommunication network, and is simultaneously applied to the connection-oriented and connection-unoriented operating modes.
Description
Technical field
The present invention relates to a kind of isl frame method for packing towards IP Telecommunication Network, belong to telecommunication technology field.
Background technology
IP Telecommunication Network is inventor is the Next Generation Telecommunication Networks implementation proposed in the patent of invention of ZL 200410037641.0 in the patent No..Its adopts unique interior outer double-layer structure and double address addressing system, by least one the multiple location being positioned at internal layer without connection data net (referred to as PTDN net) be positioned at outer field multiple IP network and form, also comprises multiple edge gateway equipment.IP network is connected without connection data net by the multiple location of edge gateway equipment and this.Each multiple location also comprises at least one address mapping device without in connection data net; Edge gateway equipment completes the mapping between double address by address mapping device.Multiple location is all assigned a multiple location without connection data net address without all devices in connection data net and edge gateway equipment, all devices in IP network and above-mentioned edge gateway equipment are all assigned IP address, IP address and multiple location are kept among the address mapping table in address mapping device without the mapping relations between connection data net address, connect after edge gateway equipment is authenticated and between address mapping device.Also have network management device in multiple location without connection data net inside, this network management device manages multiple location without the access layer equipment in connection data net, convergence-level equipment and core layer equipment simultaneously.
In IP Telecommunication Network, the IP bag being sent to destination from source transmits in the following way: first, the IP that the edge gateway equipment (referred to as ED equipment) being positioned at source receives from IP network divides into groups, and the IP destination address in being divided into groups by IP delivers to address mapping device (referred to as ADT equipment); Address mapping device carries out the IP destination address of IP network and multiple location without the address resolution between connection data net destination ED device address and mapping, by the multiple location of destination ED equipment that obtains without the loopback of connection data net address to source ED equipment; Source ED equipment sends message to destination ED equipment according to multiple location without connection data net address; Destination ED equipment receives message, E-Packets to IP network according to object IP address, thus makes IP divide into groups finally to arrive destination.
IP Telecommunication Network is as a kind of brand-new network architecture, have employed the network topology of stratification, have determine communication path, mutually isolated known, controlled Internet resources are provided, thus can better for user provides all kinds business, also may be used for carrying other business network, as IP network, other emerging service networks such as ATM net, FR net and the telecommunications network in future, the Internet, Internet of Things.
The link layer of IP Telecommunication Network provides the communication function of point-to-point, support SCCP connection-oriented and not SCCP connection-oriented two kinds of working methods, effectively can realize VPN (being called for short VPN), multicast, also can compress the header of grouping meanwhile.But existing Link Frame Structure cannot realize above-mentioned functions easily.Therefore, need to provide a kind of new Link Frame Structure and utilize this Link Frame Structure to realize these functions of IP Telecommunication Network.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of isl frame method for packing towards IP Telecommunication Network.The isl frame that this method for packing realizes has plurality of advantages such as transmitting expense is little, structure simple, favorable expandability, realization convenience.
For realizing above-mentioned goal of the invention, the present invention adopts following technical scheme:
Towards an isl frame method for packing for IP Telecommunication Network, implemented by communication entity, it is characterized in that:
Described communication entity first according to the type of isl frame, the value of setup control field, thus isl frame is defined as info class frame, one that link controls in class frame and link maintenance class frame;
When described isl frame is confirmed as the information frame under SCCP connection-oriented working method, described communication entity continues to fill in the Logic Channel Identifier of described information frame, OAM frame identification and flow control instruction in information field, and by the packet of information field bearer network network layers; When information frame under described isl frame is confirmed as not SCCP connection-oriented working method, the packet of only bearer network network layers in information field.
Wherein, described communication entity writes numerical value in the Error Control field of described isl frame, to realize corresponding error-control technique.
The length of described control field is a byte.
Described communication entity is information frame under SCCP connection-oriented working method by identifying described isl frame to described control field value 0X00.
Described communication entity is information frame not under SCCP connection-oriented working method by identifying described isl frame to described control field value 0X03.
Under SCCP connection-oriented working method, when the Logic Channel Identifier of described information frame is 0, represent that described information frame is the information frame of control plane under SCCP connection-oriented working method; When the Logic Channel Identifier of described information frame is not 0, represent that described isl frame is the Frame of datum plane under SCCP connection-oriented working method.
Although the frame headers overhead of the isl frame that this method for packing obtains only has a byte, the type of all isl frames on IP Telecommunication Network can be identified.This Link Frame Structure can realize the link controlling functions of IP Telecommunication Network, link maintenance function, link test function and the carrying to upper layer data bag, be applicable to SCCP connection-oriented and not SCCP connection-oriented two kinds of working methods, the frame not relying on any mode delimits frame forming tech simultaneously.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.
Fig. 1 is the frame structure schematic diagram of the isl frame that this isl frame method for packing obtains;
Fig. 2 is under connection-oriented working method, the frame structure schematic diagram of information frame;
Fig. 3 is under not connection-oriented working method, the frame structure schematic diagram of information frame.
Embodiment
As shown in Figure 1, the isl frame that isl frame method for packing provided by the present invention obtains at least is made up of control field and information field, can arrange Error Control field as required in addition.Wherein, control field length is fixed as a byte (8bit), for identifying all types of frames for IP Telecommunication Network; The length of information field is not fixed, for convey data packets; Error Control field generally has fixing length, for realizing various error-control technique.
In order to realize above-mentioned isl frame, the communication entity (including but not limited to access layer equipment, convergence-level equipment, core layer equipment and edge gateway equipment) of isl frame encapsulation is realized first according to the particular type (info class frame, link control class frame or link maintenance class frame) of isl frame, the value of setup control field in IP Telecommunication Network.This control field is for distinguishing the frame of following three types: info class frame, link control class frame and link maintenance class frame.Be described as follows:
Info class frame comprises information frame (CI) under SCCP connection-oriented working method and the information frame (CLI) not under SCCP connection-oriented working method, is respectively used to carry packet under SCCP connection-oriented working method and the upper layer data bag not under SCCP connection-oriented working method.
Under connection-oriented working method, information frame (CI) can be identified by control field value 0X00.Link layer not only provides frame to encapsulate ability, also provides the multiplexing function of logic-based channel.Therefore, for the information frame being positioned at Different Plane, as the information frame of datum plane and control plane, by being carried on different logic channels respectively, distinguished by Logic Channel Identifier.
When control field is designated the information frame under SCCP connection-oriented working method, in information field, carry Logic Channel Identifier, flow control instruction, OAM frame identification and upper layer data bag; When information frame under control field is designated not SCCP connection-oriented working method, the packet of only bearer network network layers in information field.
When determining the information frame under a certain isl frame is SCCP connection-oriented working method when communication entity, first the control field of this information frame is identified, then in follow-up information field, fill in the Logic Channel Identifier of this information frame, OAM frame identification, flow control instruction (comprising forward direction Blocked flag and backward Blocked flag) further, and fill in reserved field as required.When communication entity determines that a certain isl frame is the information frame not under SCCP connection-oriented working method, first the control field of this information frame is identified, then the packet of direct fill-net network layers in information field.
Logic Channel Identifier (LC-ID) is used for tagging logic channel, only there is local significance, Logic Channel Identifier be 0 logic channel be used for carrying the information frame of control plane under SCCP connection-oriented working method, Logic Channel Identifier be not the logic channel of 0 for carrying the Frame of datum plane under SCCP connection-oriented working method, its concrete frame structure is as shown in Figure 2.
Can setting operation maintenance and management (OAM) identification field as required in Logic Channel Identifier (LC-ID) below.Whether this field is used for identifying this frame is OAM frame; If this mark value is 1, represent that this frame is OAM frame, if this mark value is 0, represent that this frame is user profile frame.Whether forward direction to be used for identifying this frame be that forward direction blocks frame if blocking (FECN) mark, forward direction blocks frame and shows and the equidirectional amount of information situation of frame being loaded with FECN and mark, for notifying that frame of its reception of end equipment encounters resource blockage.Whether backward obstruction (BECN) mark is used for identifying this frame is that rear forward direction blocks frame, and backward obstruction frame shows and the reciprocal amount of information situation of frame being loaded with FECN and mark, for notifying that frame of its transmission of end equipment encounters resource blockage.Reserved field is set to 0 temporarily.The length of information field is not fixed, but must meet the requirement of eight integral multiples.
Under not connection-oriented working method, information frame (CLI) can be identified by control field value 0X03, and the packet of only bearer network network layers in its information field, concrete frame structure as shown in Figure 3.
When communication entity determines that a certain isl frame is link control class frame, first the control field of this isl frame is identified, to determine the type of control frame.This link controls class frame and is divided into command frame and response frame, wherein command frame is sent to the communication entity being positioned at opposite end (i.e. receiving terminal) by transmitting terminal, to this communication entity, certain requirement is proposed, after the communication entity being positioned at receiving terminal receives command frame, answer the requirement of transmitting terminal in the mode of response frame.
In IP Telecommunication Network system, typical link controls class frame and comprises following several classes:
A. link establishment command frame (SETUP): the communication entity sending to opposite end, link layer data link is set up for request, if agree to after receiving terminal receives that setting up link connects, then answer and receive response (ACK), if do not agree to that setting up link connects, then answer chain rupture response (DM);
B. chain rupture command frame (DISC): send to opposite end communication entity, connecting for asking to stop link, should reply and receiving response (ACK) after receiving terminal receives;
C. chain rupture response frame (DM): for answering opposite end communication entity, informs that its data link layer cannot connecting link;
D. receiving response frame (ACK): for informing opposite end communication entity, representing the link establishment command frame (SETUP) or the chain rupture command frame (DISC) that accept opposite end communication entity.
E. frame reject response frame (FRMR): there occurs the mistake cannot carrying out recovering for notification data Link Entity, as received undefined order or response frame, receiving the frame of size error, receiving oversized frame etc.
When communication entity determines that a certain isl frame is link maintenance class frame, also the control field of this isl frame is identified, so that it accurately identifies by associated communication entity.Link maintenance class frame is also divided into command frame and response frame.
In IP Telecommunication Network system, typical link maintenance class frame comprises following several classes:
A. information exchange command frame (XI): for informing the relevant information of the communication entity local terminal of opposite end or the communication entity request relevant information to opposite end, as address information, link-state information, test request etc.;
B. information exchange response frame (XI): for responding the information exchange command frame of opposite end, the request according to information exchange life frame provides corresponding response and answers.The communication entity being positioned at both link ends also can exchange message exchange command frame and information exchange response frame to keep the activation of link.
When isl frame uses in IP Telecommunication Network system, need to adopt corresponding error-control technique.For this reason, the communication entity realizing isl frame encapsulation writes numerical value according to actual needs in Error Control field.Error Control field may be used for realizing various error-control technique, as CRC etc.Based on this Error Control field, the isl frame packaged by the present invention can adopt multiple existing frame to delimit frame forming tech and error checking method, as the demarcation of HDLC mark and CRC error checking and correction etc.These are all the routine techniques means that those skilled in the art are familiar with, and have not just been described in detail at this.
Above the isl frame method for packing towards IP Telecommunication Network provided by the present invention is described in detail.For one of ordinary skill in the art, to any apparent change that it does under the prerequisite not deviating from connotation of the present invention, all by formation to infringement of patent right of the present invention, corresponding legal liabilities will be born.
Claims (6)
1., towards an isl frame method for packing for IP Telecommunication Network, implemented by communication entity, it is characterized in that:
Described communication entity first according to the type of isl frame, the value of setup control field, thus isl frame is defined as info class frame, one that link controls in class frame and link maintenance class frame;
When described isl frame is confirmed as the information frame under SCCP connection-oriented working method, described communication entity continues to fill in the Logic Channel Identifier of described information frame, OAM frame identification and flow control instruction in information field, and by the packet of information field bearer network network layers; When information frame under described isl frame is confirmed as not SCCP connection-oriented working method, the packet of only bearer network network layers in information field;
When described isl frame is confirmed as link control class frame, the control field of described communication entity to this isl frame identifies, to determine the type of control frame; Described link controls class frame and is divided into command frame and response frame, wherein command frame is sent to the communication entity being positioned at opposite end by transmitting terminal, propose certain requirement to this communication entity, after the communication entity being positioned at receiving terminal receives command frame, answer the requirement of transmitting terminal in the mode of response frame;
When described isl frame is confirmed as link maintenance class frame, the control field of described communication entity to this isl frame identifies, so that it accurately identifies by associated communication entity.
2., as claimed in claim 1 towards the isl frame method for packing of IP Telecommunication Network, it is characterized in that:
Described communication entity writes numerical value in the Error Control field of described isl frame, to realize corresponding error-control technique.
3., as claimed in claim 1 towards the isl frame method for packing of IP Telecommunication Network, it is characterized in that:
The length of described control field is a byte.
4., as claimed in claim 3 towards the isl frame method for packing of IP Telecommunication Network, it is characterized in that:
Described communication entity is information frame under SCCP connection-oriented working method by identifying described isl frame to described control field value 0X00.
5., as claimed in claim 3 towards the isl frame method for packing of IP Telecommunication Network, it is characterized in that:
Described communication entity is information frame not under SCCP connection-oriented working method by identifying described isl frame to described control field value 0X03.
6., as claimed in claim 1 towards the isl frame method for packing of IP Telecommunication Network, it is characterized in that:
When the Logic Channel Identifier of information frame is 0 under described SCCP connection-oriented working method, represent that described information frame is the information frame of control plane under SCCP connection-oriented working method; When the Logic Channel Identifier of described information frame is not 0, represent that described information frame is the Frame of datum plane under SCCP connection-oriented working method.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101572835A (en) * | 2008-04-30 | 2009-11-04 | 华为技术有限公司 | Method and device for information transmission and control management on data link layer in layered order address packet network |
| CN101902386A (en) * | 2009-05-31 | 2010-12-01 | 北京中京创原通信技术有限公司 | Packing method of virtual private network control message in IP telecommunication network system |
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| CN1250294A (en) * | 1999-07-27 | 2000-04-12 | 邮电部武汉邮电科学研究院 | Adaption method for fusion of Ethernet with synchronizing digital system or synchronizing optical network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101572835A (en) * | 2008-04-30 | 2009-11-04 | 华为技术有限公司 | Method and device for information transmission and control management on data link layer in layered order address packet network |
| CN101902386A (en) * | 2009-05-31 | 2010-12-01 | 北京中京创原通信技术有限公司 | Packing method of virtual private network control message in IP telecommunication network system |
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