CN101753585B - Communication method for service data borne with time stamp - Google Patents
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Abstract
The invention relates to a communication method for service data borne with a time stamp, and belongs to the technical field of communication. The communication method comprises that: a transmitting node receives the service data with the time stamp, transmits the service data with the time stamp in a form of control information between each protocol layer, and transmits the service data in a form of a domain in a protocol data unit head in a peer-to-peer protocol layer between the node and a next node adjacent to the node simultaneously; the transmitting node changes the service process of the node for the service data according to the received time stamp in the service data; a receiving node identifies the domain containing the time stamp from the protocol data unit head with the time stamp; and the receiving node transmits the identified time stamp in the form of the control information between each protocol layer in the node. The communication method ensures that service timeliness and other fractionized demands are guaranteed, realizes real-time transmission, and relieves the tension degree of the resource allocation and upgrading pressure of network equipment.
Description
Technical field
The present invention relates to a kind of communication means of business datum of borne with time stamp, belong to communication technical field.
Background technology
Along with continuous advancement in technology, type service of on terminals such as mobile phone, smart mobile phone, internet computer, being supported and business tine are day by day abundant.The mutual fusion of telecommunication service and Internet service will become the development trend of next generation network service.On the other hand; The user new variation also occurred to the demand of business; The more data business no longer needs instantaneous transmission as voice service in the past; Also can not get the assurance in transmission time unlike note or multimedia message that kind, but need transmit satisfying of its individual demand according to Service User, this individual demand is the timeliness demand.
To the timeliness demand, present telecommunication system and the Internet have used means such as priority to distinguish to business, but it is often thicker to distinguish granularity.For same type service, generally the order of importance and emergency can't be further distinguished in still First Come First Served, and the service traffics in the network embody the characteristic that comparatively significantly happens suddenly, thereby the software and hardware of server, processor in the network is brought bigger pressure for upgrading.And as far as the user, no matter own business of being asked promptly whether, the service that is obtained all can't be distinguished with the expense of being paid, the user is left with no alternative; Just service quality and user's request and charge etc. that having caused network is thus provided fail to link up with well.In addition, the business datum method for communicating can not solve the problem of in good time transmission well in the existing network.Because all kinds of business to postpone, the requirement of communication quality differs greatly, so when business queuing, dispatch network resource the criterion and the target of lack of uniform; Add the restrictions such as complexity that all kinds of algorithms are realized in the system, network performance is difficult to well brought into play, and customer service also can't guarantee to send to as required in good time.
Summary of the invention
The objective of the invention is to propose a kind of communication means of business datum of borne with time stamp; Make the entrained time tag of business datum can be supported protocol layer transmission, identification and the use of the professional communication node of time tag; Guarantee that business datum is able in good time transmission on the one hand, on the other hand, each node is according to the entrained time tag of business data packet in the communication path; Carry out system resource scheduling and distribution, to promote the service bearer ability of network.
The communication means of the business datum of the borne with time stamp that the present invention proposes may further comprise the steps:
(1) sending node receives the business datum that has time tag; Between the protocal layers of this intranodal with the form passing time label of control information, simultaneously the peer protocol interlayer between this node and the next node adjacent with this node with protocol data unit head in the form passing time label in a territory;
(2) sending node changes the service process of this node to business datum according to the time tag in the business datum that receives;
(3) receiving node identifies the territory of containing time tag from the protocol data unit head that has time tag;
(4) the above-mentioned time tag that between the protocal layers of this intranodal, identifies of receiving node with the form transmission of control information.
The communication means of the business datum of the borne with time stamp that the present invention proposes, its advantage is:
At first, existing communication means is not supported the demand of business is segmented, and can not the carrying demand business of segmentation; And the communication means that the present invention proposes has the ability of the business of carrying demand segmentation, through transmission, identification and the use to the entrained time tag of time tag business, guarantees that professional segmentation demands such as timeliness are guaranteed, and realizes in good time transmission.
In addition; The communication means that the present invention proposes has improved user's under the new business demand the experience and the bearing capacity of network: as far as the user; Allow it when requested service, to propose the timeliness demand, and obtain corresponding in good time service, the expense that payment is corresponding according to this demand according to urgency level; As far as network, business datum can be transmitted according to time tag in good time, and the service traffics in the network are obtained smoothly, thereby has alleviated the pressure for upgrading of the tensity and the network equipment of resource allocation.
Simultaneously, the communication means that the present invention proposes is easy to realize, need not existing telecommunication system and internet system are done big change; Based on existing system,, system is possessed the professional bearing capacity of time tag for the part software of communication node or hardware add transmission, identification and function of use to time tag.The inventive method both had been applicable to the carrying of the business of adding time tag, also was applicable to the carrying of the business of other demand segmentations.
Description of drawings
Fig. 1 is the corresponding communication system sketch map of communication means of the business datum of borne with time stamp.
Fig. 2 is a sketch map of supporting the communication system information source node of time tag business.
Fig. 3 is a sketch map of supporting the communication system intermediate node of time tag business.
Fig. 4 is a sketch map of supporting the communication system information destination node of time tag business.
Fig. 5 is the frame structure sketch map of the protocol Data Unit of overlapping layer (transmission type time tag processing protocol layer) generation.
Fig. 6 is the frame structure sketch map of the protocol Data Unit of network layer (transmission type time tag processing protocol layer) generation.
Fig. 7 is the sketch map that the time tag domain information constitutes.
Fig. 8 is the service process sketch map that data link layer (service type time tag processing protocol layer) is changed.
Embodiment
The communication means of the business datum of the borne with time stamp that the present invention proposes; At first sending node receives the business datum that has time tag; Between the protocal layers of this intranodal with the form passing time label of control information, simultaneously the peer protocol interlayer between this node and the next node adjacent with this node with protocol data unit head in the form passing time label in a territory; Sending node changes the service process of this node to business datum according to the time tag in the business datum that receives; Receiving node identifies the territory of containing time tag from the protocol data unit head that has time tag; The above-mentioned time tag that receiving node identifies with the form transmission of control information between the protocal layers of this intranodal.
One of way that realizes on-demand service, transmission in good time is to add time tag for each business datum, is 5 minutes such as label value, 30 minutes and 2 hours, and to characterize professional pressing degree.This business of having added time tag is called the time tag business.Adopt time tag then to allow network node more reasonably to carry out Resource Allocation in Networks according to the time tag business,
Guarantee that the user needs most, the most urgent business is in time served, distribute suitable resource when not urgent user can be chosen in the spare time, correspondingly payable lower expense, the while has also been alleviated the tensity of the sudden and resource allocation of Network.
In the inventive method, the passing time label function is included in the peer protocol interlayer transmission of each node in intranodal transmission and the network, and then makes the time tag business have the adaptability to the heterogeneous networks system; The recognition time label function needs node time label business data to be handled and discerned the time tag that it carries with short as far as possible time overhead, and this identifying need meet the protocol analysis ability of node simultaneously; Service time, label function needed node reasonably to carry out the allotment of Internet resources according to the time tag of business, to optimize networks efficiency.
In the inventive method, sending node has the passing time label and changes the function of service process, and receiving node has the function of recognition time label and passing time label.In practical communication system, when can transmitting data by information source node and intermediate node, the above-mentioned functions of sending node accomplishes, when can receiving data by information destination node and intermediate node, the above-mentioned functions of receiving node accomplishes.
Below in conjunction with accompanying drawing, specific embodiments of the invention is explained as follows.
Fig. 1 is and the corresponding communication system of communication means of the present invention (be designated hereinafter simply as and carry the professional communication system of time tag) sketch map.According to the present invention, the communication system of carrying time tag business is by at least one information source node, at least one information destination node and be arranged in information source node and the communication path of information destination node, provides the intermediate node of business datum buffer memory, processing and forwarding to constitute.Communication system as shown in Figure 1 comprises an information source node S1, information destination node D1 and 2 intermediate node R1, R2.At first; Described information source node S1 handles data to be sent and corresponding time tag information through supporting the professional communication protocol stack of time tag; Generate protocol Data Unit to be sent, and protocol Data Unit to be sent is sent to said support time tag professional intermediate node R1, R2; Then, intermediate node R1 receives protocol Data Unit, and storage and processing, then protocol Data Unit is sent to other intermediate nodes (being R2 in this instance) or said information destination node D1; Intermediate node R2 is identical with R1 to the operation of protocol Data Unit; At last, information destination node D1 receives protocol Data Unit, thereby obtains service data unit and time tag.In addition; The professional intermediate node of time tag of not supporting in the communication system will not be set forth in the present invention; This category node carries out transparent forwarding with data, does not influence other nodes and supports functions such as time tag professional protocol layer service change, time tag carry and transmit.
According to the inventive method; Carry the professional communication system of time tag and contain the information source node that at least one supports that time tag is professional; Its effect is: the service data unit with different timelinesses is provided for the user; And generate protocol Data Unit to be sent and corresponding time tag, then by each time tag processing protocol layer of communication protocol stack it is discerned and transmits, by at least one service type time tag processing protocol layer according to time tag change the service process of this layer, by at least one transmission type time tag processing protocol layer with time tag as a territory of the protocol data unit head of this layer generation, protocol Data Unit is sent to receiving node by non-time tag protocol layer.Its output links to each other with said intermediate node or the corresponding input of information destination node.
Fig. 2 is in the inventive method, the structural representation of described information source node.According to the inventive method, support the professional information source node of time tag to have and support communication protocol stack and professional layer that generates of time tag that is positioned on the said protocol stack that time tag is professional; Said protocol stack comprises a plurality of continuous time tag processing protocol layers and is positioned at the non-time tag protocol layer under these layers.Information source node S1 as shown in Figure 2 comprises the end of to from the top successively: the professional layer PL1 that generate of time tag, n continuous time tag processing protocol layer ST1, ST2, ST3 ..., STn and non-time tag protocol layer NST1.
Information source node is described below sends the process of protocol Data Unit.At first, the professional protocol entity that generates layer PL1 of described time tag generates service data unit SDU1 to be sent and corresponding time tag SDUTM1, and it is passed to the highest said time tag processing protocol layer ST1; Then; Each the time tag processing protocol layer that begins from the highest time tag processing protocol layer ST1 receives service data unit and time corresponding label from the upper strata successively; Through after accomplishing function and transmission type time tag processing protocol layer that this layer protocol service function, service type time tag processing protocol layer change this layer service process time tag being added into the function of protocol data unit head, transmit protocol Data Unit and time tag thereof downwards; If this layer is minimum time tag processing protocol layer STn, then only transmit protocol Data Unit to its down said non-time tag protocol layer NST1; At last, non-time tag protocol layer NST1 sends to receiving node with protocol Data Unit.
According to the inventive method; Carry the professional communication system of time tag and contain the intermediate node of supporting that time tag is professional; Its effect is: be arranged in the communication path of information source node and information destination node, for communicating by letter of information source node and information destination node provides the packet storage, handles and transmit.
Fig. 3 is in the system of the inventive method, the structural representation of intermediate node.According to the present invention, support the professional intermediate node of time tag to have the communication protocol stack of supporting that time tag is professional; Said protocol stack comprises a plurality of continuous time tag processing protocol layers and is positioned at the non-time tag protocol layer under these layers.Intermediate node R1 as shown in Figure 2 comprises the end of to from the top successively: the continuous time tag processing protocol layer RT1 of k, RT2, RT3 ..., RTk and non-time tag protocol layer NRT1.The function of supporting the intermediate node that time tag is professional is that packet storage, the function of handling and transmitting are provided in the communication path of information source node and information destination node; Promptly receive protocol Data Unit, and be transmitted to receiving node through storage, processing etc. from sending node.
At first describe intermediate node and receive process from the protocol Data Unit of sending node.Described non-time tag protocol layer NRT1 receives the protocol Data Unit from sending node; Then, non-time tag protocol layer upwards is passed to said minimum time tag processing protocol layer RTk with protocol Data Unit; Then; Each the time tag processing protocol layer that begins from minimum time tag processing protocol layer RTk receives the protocol Data Unit from lower floor successively; Parse service data unit wherein, and accomplish the function that transmission type time tag processing protocol layer is resolved time tag; If this layer is not the highest time tag processing protocol layer RT1, then to upper strata passing service data cell and time tag; If this layer is the highest time tag processing protocol layer RT1, then this layer obtains service data unit SDU2 to be transmitted and corresponding time tag SDUTM2.
Next the process of intermediate node retransmission protocol data cell is described.At first, the highest label processing protocol layer RT1 obtains service data unit SDU2 to be sent and time corresponding label SDUTM2 from receiving course.Then; Each the time tag processing protocol layer that begins from the highest time tag processing protocol layer RT1 receives service data unit and time corresponding label from the upper strata successively; Through after accomplishing function and transmission type time tag processing protocol layer that this layer protocol service function, service type time tag processing protocol layer change this layer service process time tag being added into the function of protocol data unit head, transmit protocol Data Unit and time tag thereof downwards; If this layer is minimum time tag processing protocol layer RTn, then only transmit protocol Data Unit to its down said non-time tag protocol layer NRT1; At last, non-time tag protocol layer NRT1 sends to receiving node with protocol Data Unit.
According to the present invention; Carry the professional communication system of time tag and contain the information destination node that at least one carries the time tag business; Its effect is: receive the protocol Data Unit from sending node; Non-time tag protocol layer by communication protocol stack passes to protocol Data Unit time tag processing protocol layer, by each time tag processing protocol layer it is upwards transmitted, from service data unit, parses time tag and upwards transmission by at least one transmission type time tag processing protocol layer; Thereby the professional layer that uses of time tag receives service data unit and corresponding time tag, obtains the service data unit with different time timeliness.Its input links to each other with said intermediate node or the corresponding output of information source node.
Fig. 4 is the structural representation of information destination node of the present invention.According to the present invention, support the professional information destination node of time tag to have and support communication protocol stack and professional layer that uses of time tag that is positioned on the said protocol stack that time tag is professional; Said protocol stack comprises a plurality of continuous time tag processing protocol layers and is positioned at the non-time tag protocol layer under these layers.Information destination node D1 as shown in Figure 4 comprises the end of to from the top successively: the professional layer PL2 that use of time tag, m continuous time tag processing protocol layer DT1, DT2, DT3 ..., DTm and non-time tag protocol layer NDT1.
Information destination node is described below receives process from the protocol Data Unit of sending node.At first, described non-time tag protocol layer NDT1 receives the protocol Data Unit from sending node; Then, non-time tag protocol layer upwards is passed to said minimum time tag processing protocol layer DTm with protocol Data Unit; Then; Each the time tag processing protocol layer that begins from minimum time tag processing protocol layer DTm receives the protocol Data Unit from lower floor successively; Parse service data unit wherein; And accomplish the function that transmission type time tag processing protocol layer is resolved time tag, then to upper strata passing service data cell and time tag; Up to the highest time tag processing protocol layer DT1 service data unit SDU1 and corresponding time tag SDUTM1 are passed to the professional layer PL2 that use of time tag, accomplish receiving course.
The flow process of the node transmission data method of the professional communication system of carrying time tag of the present invention is below described.According to the present invention, the highest time tag processing protocol layer obtains service data unit to be sent and corresponding time tag.Each time tag processing protocol layer judges whether this layer is service type time tag processing protocol layer then, if then change the service process of this time tag processing protocol layer protocol; Next accomplish the service function of this layer.Said " judging whether this layer is service type time tag processing protocol layer note " is designated as circulation initial step 1.Each time tag processing protocol layer judges whether this layer is transmission type time tag processing protocol layer subsequently, if then with the territory of time tag territory as this layer protocol data cell; Next generate this layer protocol data cell.If lower floor is still the time tag processing layer, then transmit 1 repetition above-mentioned steps of protocol Data Unit and time label and self-loopa initial step downwards; If lower floor is non-time tag protocol layer, then transmit protocol Data Unit downwards.At last, by non-time tag protocol layer protocol Data Unit is sent to receiving node.
The flow process that the highest time tag processing protocol layer of the present invention obtains service data unit to be sent and corresponding time stamp methods is below described.According to the present invention, if sending node is an information source node, then generates layer entity rise time label and generate the layer protocol data cell, and generate a time tag for each time tag generates the layer protocol data cell by time tag; Then this data cell and time label are sent to the highest time tag processing protocol layer, thereby the highest time tag processing protocol layer obtains data to be sent and corresponding time tag.If sending node is an intermediate node, then DRP data reception process obtains service data unit to be sent and corresponding time tag, thereby the highest time tag processing protocol layer obtains data to be sent and corresponding time tag.
The node of below describing the professional communication system of carrying time tag of the present invention receives the flow process of data method.According to the present invention, non-time tag protocol layer receives the protocol element data from sending node, and transmits to minimum time tag processing layer.Each time tag processing protocol layer parses service data unit wherein with the protocol Data Unit that receives then; Said " protocol Data Unit that receives is parsed service data unit wherein " is designated as circulation initial step 2.Next judge whether this layer is transmission type time tag processing protocol layer, if then the protocol Data Unit that receives is parsed time tag.Each time tag processing protocol layer judges whether this layer is higher protocol layer subsequently; If not then service data unit is submitted to the upper strata; If this layer is a transmission type time tag processing protocol layer; Then time tag is submitted to the upper strata in the lump, 2 repetition above-mentioned steps of self-loopa initial step then; Judge that if then carry out the receiving node type if receiving node is an information source node, then service data unit and time tag are passed to the professional layer that uses of time tag, accomplish receiving course; If receiving node is an intermediate node, then service data unit and time tag are passed to the highest time tag processing protocol layer, wait to transmit.
The transmission type time tag processing protocol layer of each node is when generating this layer protocol data cell in the communication system of carrying time tag business of the present invention; With the territory of time tag as protocol data unit head; Thereby and pass to the peer protocol entity of other nodes based on the transmission service of bottom, parse time tag and to the adjacent layer transmission or in this layer use for this entity.Fig. 5, Fig. 6 have described the frame structure of the protocol Data Unit that overlapping layer, network layer generated as transmission type time tag processing protocol layer respectively.Specify the function and the operation principle of transmission type time tag processing protocol layer for example below in conjunction with all kinds of frame structures among the figure.
Fig. 5 is the frame structure as the protocol Data Unit of the overlapping layer generation of information source node transmission type time tag processing protocol layer.Overlapping layer in the described communication protocol stack refers to the intermediate layer that is positioned at below the application layer, more than the transport layer.Because the development of network infrastructure, increasing communication protocol is implemented in overlapping layer, as postponing tolerance network, peer-to-peer network etc.The pairing information source node of Fig. 8 adopts the overlapping network technology; The overlapping network technology can satisfy being connected of time timeliness demand for information source provides with the application layer at stay of two nights two ends, and need not change the details of underlying protocol based on any different transport layer and one or more following bearer network end to end.
The overlapping layer of this information source node is the highest time tag processing protocol layer; This layer receives service data unit SDU1 to be sent and the corresponding time tag SDUTM1 from application layer (being that the time tagged traffic generates layer); And when generating this layer protocol data cell, with the territory of time tag SDUTM1 as the protocol data unit frame structure.Described overlapping layer adopts ties up (bundle) agreement; Its frame structure adds the time tag territory with being designed in the frame head of existing overlapping layer network; Particularly be tying up main head back and tying up the payload header front and add the expansion bundling head that contains with time tag SDUTM1 time corresponding label field before the application layer service data unit SDU1 to be sent; Particularly in this head, adopt the sign of " last extension header ", because hypothesis is only added this extension header.At last, the overlapping layer protocol Data Unit that will contain the time tag territory transmits downwards.
For the intermediate node of supporting the said overlapping layer of Fig. 5, the function of its transmission type time tag processing protocol layer is identical with operation principle and information source node.For the receiving node of supporting the said overlapping layer of Fig. 5, overlapping layer is the highest time tag processing protocol layer; This layer reception parses wherein service data unit and SDU1 and time corresponding label SDUTM1 from the protocol Data Unit of bottom, and uses to upper layer transfers or at this layer.
Fig. 6 is the frame structure as the protocol Data Unit of the network layer generation of information source node transmission type time tag processing protocol layer.The pairing information source node of Fig. 6 adopts three layers of route technology; Three layers of route provide the route service of end-to-end support time tag business and network layer address; Promptly the routing algorithm in each jumping place of route is relevant with the time tag value; According to next jumping of the time tag value of each protocol Data Unit decision route, send to information destination node on time with the guarantee agreement data cell.
The network layer of this information source node is the second high time tag processing protocol layer; This layer receives service data unit to be sent and the corresponding time tag from transport layer (promptly the highest time tag processing protocol layer), and when generating this layer protocol data cell, with the territory of time tag as the protocol data unit frame structure.Described network layer adopts the datagram Subnetwork protocol based on packet forward, i.e. IPv6; Its frame structure adds the IPv6 extension header that contains the time tag territory at the back with the IPv6 master's head that was designed to before the transport layer services data cell; Particularly adopt the extension header of hop-by-hop options, because this information is the information that must check of all-router on the way; Territory with " next stature " in IPv6 master's head is made as 00000000 simultaneously, and what be illustrated in its back is the extension header of hop-by-hop options.At last, the network layer protocol Data Unit that will contain the time tag territory transmits downwards.
For the intermediate node of supporting the said network layer of Fig. 6, the function of its transmission type time tag processing protocol layer is identical with operation principle and information source node.For the receiving node of supporting the said network layer of Fig. 6, network layer is the second high time tag processing protocol layer; This layer reception parses wherein service data unit and time corresponding label from the protocol Data Unit of bottom, and uses to upper layer transfers or at this layer.
In the communication system of carrying time tag business of the present invention, the dissimilar service data unit that produces from information source node has the different time timeliness; This timeliness is that the user determines by the user of communication service, and carries out quantitative identifying with absolute time value or relative time values, is called time tag.Therefore absolute time or relative time can be represented in the transmission type time tag processing protocol layer of each category node time tag territory of in protocol Data Unit, adding.Therefore the responsible time tag information rise time label field that this layer received of transmission type time tag processing protocol layer need carry out corresponding format design to form this territory for time tag.One of implementation method of time tag value is that absolute time value or relative time values in the time tag information are characterized by binary mode, and adding time tag territory verification is the time tag territory of 2 words of unit word with position and formation with 32; This time tag territory will embed through at least one transmission type time tag processing protocol layer in the protocol data unit frame structure of one deck at least according to system features and demand, in communication, support the foundation of the professional system resource scheduling of time tag and configuration so that each layer to be provided.
In order to specify the method that above-mentioned time tag information is generated as the time tag territory; Illustrate time tag domain information pie graph; Referring to Fig. 7: the time tag territory is that the word of unit is formed by two with 32; Its middle age (12), month (4), day (5), hour (5), minute (6) information are first word, and second (6), millisecond (10) information and check digit (16) are second word; Each information is absolute time or relative time, with the former representation of binary system; Time tag verification and be the result of 16 binary system true forms of first three groups summation.If system uses absolute time, require then that time synchronization error is not more than certain particular range in the system; Use relative time, then this time means and is carved into the upper limit that business datum is all correctly sent to the time interval constantly when the user asks to send.As shown in Figure 7, absolute time 400 milliseconds of words of 2 32 that can be expressed as among the figure, 18: 30: 20 on the 1st September in 2009.
The service type time tag processing protocol layer of each node is before the service function of accomplishing this layer in the professional communication system of carrying time tag of the present invention, needs earlier to change according to the service process of the entrained time tag of protocol Data Unit to this layer.Fig. 8 has described data link layer and has changed the sketch map of serving as service type time tag processing protocol layer.Specify the function and the operation principle of service type time tag processing protocol layer for example below in conjunction with Fig. 8.
As shown in Figure 8, communication system is made up of A, B, three nodes of C, needs to accomplish the operation of being transmitted protocol Data Unit PDU2 by said information source node A to information destination node C transmission protocol Data Unit PDU1 with by information source node C to information destination node A.The time tag PDUTM1 of protocol Data Unit PDU1 is 3 time slot relative times, and the time tag PDUTM2 of protocol Data Unit PDU2 is 3 time slot relative times; Above-mentioned time tag is a benchmark with transmission course zero hour.With the 802.11s standard is that the wireless mesh fidonetFido is an example, and the data link layer of communication protocol stack adopts 802.11s corresponding logical connection control sublayer (LLC) agreement and medium access control sublayer (MAC) agreement in this communication system; The communication system of using this agreement is two layers of route system (promptly characterize each node of jumping in the route with MAC Address, and accomplish forwarding in data link layer).Only allow a node to send protocol Data Unit in the same transmission time slot of native system.
Shown in Fig. 8 (a), when intermediate node B does not utilize time tag to change the service of data link layer, when intermediate node B receives the protocol Data Unit PDU1 of information source node A at the first time slot TS1, promptly be transmitted to information destination node C at next time slot TS2; Information source node C could send to intermediate node B with protocol Data Unit PDU2 at the 3rd time slot TS3 subsequently, at the 4th time slot TS4 it is transmitted to information destination node A by intermediate node B again.Accomplish aforesaid operations and need 4 time slots altogether; Wherein protocol Data Unit PDU1 has satisfied the demand of its time label; (2 time slots) has been delivered to information destination node in 3 time slots, and protocol Data Unit PDU2 fails to satisfy the demand of its time label, spends 4 time slots and just is delivered to information destination node.Therefore, when not utilizing time tag to change the service of data link layer, systematic function can't satisfy predefined demand.
Shown in Fig. 8 (b), when intermediate node B had utilized time tag to change the service of data link layer, the time of accomplishing aforesaid operations can foreshorten to 3 time slots.Particularly; When intermediate node B receives the protocol Data Unit PDU1 of information source node A at the first time slot TS1; Data link layer as service type time tag protocol layer is judged protocol Data Unit PDU1 time corresponding label PDUTM1; Discovery is greater than 2 time slots, so intermediate node B stores protocol Data Unit PDU1 and forwarding after a while.Next, information source node C sends to intermediate node B at the second time slot TS2 with protocol Data Unit PDU2.At the 3rd time slot, intermediate node B carries out XOR with protocol Data Unit PDU1 and PDU2, and sends to information destination node A and C simultaneously; Information destination node A, C carry out XOR with the former protocol Data Unit of this locality once more after receiving this protocol Data Unit, can obtain the corresponding protocol Data Unit from the other side.Accomplishing aforesaid operations needs 3 time slots altogether, and protocol Data Unit PDU1 and PDU2 have all satisfied the demand of its time label, and (3 time slots) has been delivered to information destination node in 3 time slots.Therefore, when utilizing time tag that the service of data link layer is changed, systematic function can satisfy predefined demand, has obtained the improvement of service effectiveness.
As above routine said; Service type time tag processing protocol layer need carry out the calculating of time tag according to the time tag value that obtains; Draw certain priority of this each business of node place, each protocol Data Unit, thereby accomplish corresponding service function according to this precedence information.
Claims (1)
1. the communication means of the business datum of a borne with time stamp is characterized in that this method may further comprise the steps:
(1) sending node receives the business datum that has time tag; Between the protocal layers of this intranodal with the form passing time label of control information, simultaneously the peer protocol interlayer between this node and the next node adjacent with this node with protocol data unit head in the form passing time label in a territory;
(2) sending node changes the service process of this node to business datum according to the time tag in the business datum that receives;
(3) receiving node identifies the territory of containing time tag from the protocol data unit head that has time tag;
(4) the above-mentioned time tag that between the protocal layers of this intranodal, identifies of receiving node with the form transmission of control information.
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| CN101047434A (en) * | 2007-04-10 | 2007-10-03 | 华为技术有限公司 | Time tag synchronous method, system and device |
| CN101282356A (en) * | 2008-05-26 | 2008-10-08 | 张建中 | Method, apparatus and system for real-time data transmission |
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| CN101282356A (en) * | 2008-05-26 | 2008-10-08 | 张建中 | Method, apparatus and system for real-time data transmission |
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