CN102244603A - Method, equipment and system for transmitting message bearing time - Google Patents
Method, equipment and system for transmitting message bearing time Download PDFInfo
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- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
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Abstract
The invention discloses a method, equipment and a system for transmitting a message bearing time, and belongs to the field of communication. The method comprises the following steps of: receiving the message bearing the time, wherein the message bearing the time is marked with timestamp information; computing the delay information of the message bearing the time in a transmission process according to local real-time time information and the timestamp information marked on the message bearing the time; and performing delay compensation on the message bearing the time according to the computed delay information, and after delay time meets a preset delay requirement, forwarding the message bearing the time. In the method, the equipment and the system, the delay compensation is performed on the received message bearing the time, and the message bearing the time is transmitted after the delay time meets the preset delay requirement, thereby keeping the delay time of the message bearing the time in the transmission process at a fixed value and enabling a digital subscriber line (DSL) system to meet the requirement that the messages bearing the time are transmitted with equal delays without jitter to further realize time synchronization.
Description
Technical field
The present invention relates to the communications field, the method for message of particularly a kind of transmission bearer time, equipment and system.
Background technology
Along with development of wireless communication devices, 3G (3rd-generation, the 3G (Third Generation) Moblie technology) and the appearance of 4G (4rd-generation, the 4th third-generation mobile communication technology) wireless communication system has been proposed higher requirement, comprising high precision time synchronization.
Prior art realizes time synchronized by the message of transmission bearer time, the mode of carrying high precision time synchronization information is provided at Ethernet, basic implementation method is to cooperate by software and hardware, each bar synchronised clock information of giving adds time tag, make recipient's sending and time of reception according to time tag record synchronised clock information, and then calculate clocking error and time-delay, realize synchronous from clock and master clock on the network.
In realizing process of the present invention, the inventor finds that there is following shortcoming at least in prior art:
The technical scheme that prior art provides requires system's non-jitter and has symmetrical time delay, but for the DSL that is most widely used at present (Digital Subscriber Line, digital subscriber line) access device, because the complexity of DSL technology itself, make the propagation delay time of dsl device asymmetric, the shake bigger, therefore, prior art can not be widely used in the DSL circuit.
Summary of the invention
In order to make the DSL system satisfy the requirement of the message of transmission bearer time, and then realize the time synchronized of DSL system, the embodiment of the invention provides method of message, equipment and the system of a kind of transmission bearer time.Described technical scheme is as follows:
On the one hand, provide the method for message of a kind of transmission bearer time, described method comprises:
Receive the message of carrying time, the message of described carrying time is labeled timestamp information;
Timestamp information according to local real-time time information and the message of described carrying time are labeled calculates the deferred message of message in transmission course of described carrying time;
According to the described deferred message that calculates, the message of described carrying time is carried out delay compensation, and time of delay satisfy default postpone to require after, the message of described carrying time is transmitted.
On the other hand, provide the equipment of the message of a kind of transmission bearer time, described equipment comprises:
Receiver module is used to receive the message of carrying time, and the message of described carrying time is labeled timestamp information;
Computing module is used for the timestamp information that the message of described carrying time of receiving according to local real-time time information and described receiver module is labeled, and calculates the deferred message of message in transmission course of described carrying time;
Delay compensation module is used for the described deferred message that calculates according to described computing module, and the message of described carrying time is carried out delay compensation, satisfies the default requirement that postpones until the time of delay of the message of described carrying time;
Sending module is used for after described delay compensation module is carried out delay compensation to the message of described carrying time the message of described carrying time being transmitted.
Again on the one hand, provide a kind of digital subscriber line DSL system, described system comprises: receiving equipment and transmitting apparatus;
Described receiving equipment, the timestamp information when being used for packet labeling to carrying time of receiving and receiving, and the message of described carrying time sent to described transmitting apparatus;
Described transmitting apparatus, be used to receive the message of the carrying time that sends by described receiving equipment, the timestamp information that is labeled according to local real-time time information and the message of described carrying time, calculate the deferred message of message in transmission course of described carrying time, and according to the described deferred message that calculates, message to the described carrying time carries out delay compensation, after satisfying default delay requirement time of delay, the message of described carrying time is transmitted.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
Carry out delay compensation by message to carrying time of receiving, and satisfy default message that again should the carrying time after postponing to require in time of delay and send, thereby message that should the carrying time remains on fixed value the time of delay in transmission course, make the DSL system can satisfy also that the required delay of the message of transmission bearer time equates and the requirement of non-jitter, and then realize time synchronized.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the method for message flow chart of transmission bearer time of providing of the embodiment of the invention one;
Fig. 2 is the IEEE 1588 protocol theory schematic diagrames that the embodiment of the invention two provides;
Fig. 3 is the baseband transmission system that provides of the embodiment of the invention two and the principle schematic of DSL system transmissions data;
Fig. 4 is the time synchronized schematic diagram of DSL system transparent transmission 1588 protocol massages that provide of the embodiment of the invention two;
Fig. 5 is the principle schematic of DSL system transparent transmission 1588 protocol massages that provide of the embodiment of the invention two;
Fig. 6 is the method for message flow chart of transmission bearer time of providing of the embodiment of the invention two;
Fig. 7 is the schematic diagram that the NP layer that provides of the embodiment of the invention two is realized DSL system transparent transmission 1588 protocol massages;
Fig. 8 is the schematic diagram that the TPS-TC layer that provides of the embodiment of the invention two is realized DSL transparent transmission 1588 protocol massages;
Fig. 9 is the apparatus structure schematic diagram of the message of transmission bearer time of providing of the embodiment of the invention three;
Figure 10 is the DSL system configuration schematic diagram that the embodiment of the invention four provides.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Embodiment one
Referring to Fig. 1, present embodiment provides the method for message of a kind of transmission bearer time, and this method flow is specific as follows:
101: receive the message of carrying time, the message of this carrying time is labeled timestamp information;
102:, calculate the deferred message of message in transmission course of carrying time according to the timestamp information that is labeled of message of local real-time time information with the carrying time;
103: according to the deferred message that calculates, the message that carries the time is carried out delay compensation, and after satisfying default delay requirement time of delay, the message of the time of carrying is transmitted.
Wherein, present embodiment does not require to limit to default the delay, during specific implementation, can set according to actual conditions.
The method that present embodiment provides, carry out delay compensation by message to carrying time of receiving, and satisfy default message that again should the carrying time after postponing to require in time of delay and send, thereby message that should the carrying time remains on fixed value the time of delay in transmission course, make the DSL system can satisfy also that the required delay of the message of transmission bearer time equates and the requirement of non-jitter, and then realize time synchronized.
Embodiment two
Present embodiment provides the method for message of a kind of transmission bearer time, this method is for being that the DSL system that data cell is carried out transfer of data provides the solution of the message of transmission bearer time with Symbol, and then makes the DSL system can realize the time synchronized of system by the message of transmission bearer time.
For convenience of explanation, present embodiment is that 1588 messages that the IEEE1588 standard agreement defines are example with the message of carrying time.Why the IEEE1588 standard agreement satisfies high precision time synchronization between network element, and basic principle is to proofread and correct by the clock to all nodes in the network of synchronous signal cycle.As shown in Figure 2, wherein, D1 is that master clock arrives the path delay from clock, and D2 is the path delay from the clock to the master clock, and establishing from the deviation between clock and the master clock is Offset, then can be drawn by Fig. 2:
TS0=TM1+Offset, TS1-TS0=D1, then Offset=TS1-TM1-D1;
In like manner, TM2=TS2-Offset+D2, then Offset=TS2-TM2+D2.
If the time-delay D1=D2 of both direction, then Offset=(TS1+TS2-TM1-TM2)/2 obtains thus from the deviation between clock and the master clock, then by adjusting deviation, can will accurately be synchronized on the master clock from clock.
Yet, the principle schematic of baseband transmission system as shown in Figure 3 and DSL system transmissions data, because baseband transmission system is to transmit data with the form of Bit stream, stable timing and time-delay relation are arranged between transmitting terminal and the receiving terminal, and data dithering is less, thereby can satisfy the condition of transmission 1588 messages.And for the DSL system that adopts Symbol (being called for short Sym) data unit transmission data, not only adopt between transmitting terminal and the receiving terminal and require lower timing relationship, and since each Symbol units of data carry more data, cause on the online data road transmission to have bigger data dithering; Simultaneously, the different frequency bands in the DSL circuit causes two-way delay unequal to the delay difference of data, and therefore, the DSL access device that is most widely used at present can't satisfy the transmission 1588 messages time delay symmetry that should have and the demand of non-jitter.
For this reason, the method that present embodiment provides is taked the mode of delay compensation, eliminate the delay and jitter that transmitting terminal, DSL circuit and the receiving terminal of packet in the DSL system produces, make, satisfy the requirement of 1588 message transmissions through the stable delay of packet maintenance of DSL system transmissions.Concrete principle as shown in Figure 4, by synchronizing information and synchronised clock at transmitting terminal and receiving terminal constructing virtual local zone time, 1588 messages are labeled the virtual local zone time of the last time of reception at the receiving terminal of packet, calculate the time of delay of 1588 messages in the DSL system by the temporal information of transmitting terminal by mark in local time information and 1588 messages, and 1588 messages are carried out buffer memory, after the satisfied default delay requirement time of delay in system of 1588 messages, by transmitting terminal this 1588 message is sent from the DSL system again.Wherein, present embodiment does not require to limit to default the delay, when specifically using, can set according to actual conditions, for example, if be 0.4 μ s the time of delay of calculating, and default delay requirement is 0.5 μ s, then needs to send after 1588 packet buffers, the 0.1 μ s again.
In addition, 1588 messages of IEEE1588 standard agreement definition comprise sync message (Sync), follow message (Follow_up), postpone request message (Delay_Req), 4 kinds of delayed response messages (Delay_Resp), next, on above-mentioned principle basis shown in Figure 4, the process of DSL system transparent transmission 1588 messages that provide in conjunction with Fig. 5, the method for message of the transmission bearer time that present embodiment is provided is elaborated.Referring to Fig. 6, method flow is specific as follows:
601: the master clock node is regularly to sending a sync message from clock node and following message;
At this step, sync message sends (being generally per two seconds once) from master clock cycle, and this sync message has comprised a timestamp, has described the scheduled time that sync message is issued.Because sync message comprises is the time of estimating of sending rather than sends the time really, thus the time of truly sending of sync message measured after, be carried at following in the message and send subsequently.
602: after receiving terminal is received sync message, in sync message, increase receiving terminal local zone time mark, and the sync message that will carry receiving terminal local zone time mark sends to transmitting terminal;
Wherein, the time when the local zone time mark that receiving terminal increases is receiving terminal reception sync message, adopt local zone time to clock, hour entry carries out between receiving terminal and transmitting terminal synchronously.
603: transmitting terminal carries out the sync message that receives sync message being sent to from clock node after the delay compensation again;
Particularly, present embodiment is not done concrete qualification to transmitting terminal to the mode that sync message carries out delay compensation, and only the mode with metadata cache is that example describes.Mode by metadata cache is to revising the time of delay of sync message, thereby guarantee that the propagation delay time of sync message in system is fixed value, guarantee that promptly Td2 shown in Figure 5 equals Td+Tline, wherein, Td postpones for the target data that is provided with, and Tline is the data delay that the road transmission is introduced under the physical layer.During specific implementation, the time that can be labeled according to the local real-time time of transmitting terminal and sync message, adopt the deferred message of local clock or Network Synchronization clock calculation sync message, and according to the deferred message that calculates, sync message is carried out buffer memory, reach the default requirement that postpones until the time of delay of sync message, this sync message is sent to from node again, present embodiment does not require to limit to default the delay.
604: after receiving sync message from clock node, to master clock node forward delay interval request message;
At this step, can note the true time of reception of sync message from clock node, and use the time of truly sending follow in the message and recipient's true time of reception, calculate from the time difference between clock and the master clock, and the time of correcting slave clock in view of the above.But the time difference that calculate this moment has comprised the time-delay that Network Transmission causes, so use the time-delay request message to come the transmission delay of define grid from clock node.
This time-delay request message be independent the setting at interval, generally should be long at interval than sync message.Accurate transmitting time from clock node record time-delay request message, the same method of delay compensation that adopts is transmitted this time-delay request message between transmitting terminal and receiving terminal, thereby guarantee that the time-delay propagation delay time of request message in system is fixed value, promptly make TS2 '-TS2 among Fig. 5 " equal Td+Tline equally.
605: the time-delay request message that master clock node basis receives is to return a delayed response message from clock node;
Wherein, carry the time that the master clock node receives the time-delay request message in the delayed response message, so that by adjusting the clock drift error according to the time of carrying this time-delay request message from clock node.In addition, the same method of delay compensation that adopts is transmitted this delayed response message between transmitting terminal and receiving terminal, thereby guarantees that the delayed response propagation delay time of message in system is fixed value, promptly makes TS3 '-TS3 among Fig. 5 " equal Td+Tline equally.
606: from the time that clock node writes down during according to the time of carrying the delayed response message that receives and from clock node self forward delay interval request message, calculate the master clock node and postpone, and adjust clocking error according to result of calculation from the Network Transmission between the clock node.
Below, in conjunction with NP (Network Processor, network processing unit) layer realizes that the concrete application scenarios of DSL transparent transmission 1588 messages is illustrated the method that present embodiment provides, as shown in Figure 7, NP is responsible for the Ethernet message of input is handled, cutting is ATM (Asynchronous Transfer Mode, asynchronous transfer mode) cell or PTM (Packet Transfer Mode, packet transfer mode) cell, and give TPS-TC (the Transport Protocol Specific-Transmission Convergence of nest plate, host-host protocol appointment-Transmission Convergence) layer is handled, when NP detect import ether network packet when being 1588 messages, adopt local timestamp information for this reason the Ethernet message mark;
Wherein, local time stamp information is made up of two parts, and a part is the Symbol counter, after this Symbol counter process receiving terminal and transmitting terminal are synchronous, safeguards the counter of a unanimity; The other part employing local clock technology of local time stamp, this local clock through physical layer synchronization, guarantees the precision of two ends counting between receiving terminal and transmitting terminal, this time is used for writing down the interior at interval precise time of two Symbol.
At transmitting terminal, after NP recovers out time timing message, will be timestamp information in the message and the contrast of local real-time time information, and calculate the deferred message of packet, when the deferred message that calculates did not reach predetermined delay, this packet will wait in Buffer, after reaching predetermined delay, this data message will be issued, thereby guarantees that the residence time of 1588 messages in the DSL system fix.
Except that above-mentioned NP layer is realized the application scenarios of DSL transparent transmission 1588 messages, the method that present embodiment provides realizes that to the TPS-TS layer application scenarios of DSL transparent transmission 1588 messages is suitable equally, as shown in Figure 8, when the NP itself with the butt joint of DSL nest plate is exactly that master clock node or NP are more fixing to the retardation ratio of data message, shake under the negligible situation, can adopt TPS-TC directly to continue the delay compensation of 1588 messages, the method for compensation method and employing NP is basic identical, does not give unnecessary details at this.
Need to prove, the method that present embodiment provides not only is applicable to the DSL system, adopt OFDM (Orthogonal Frequency Division Multiplexing for other, OFDM) technology, and the system that adopts Symbol to carry out transfer of data as data cell is suitable equally, and present embodiment is not done concrete qualification to this.
The method that present embodiment provides, carry out delay compensation by message to carrying time of receiving, and satisfy default message that again should the carrying time after postponing to require in time of delay and send, thereby message that should the carrying time remains on fixed value the time of delay in transmission course, make the DSL system can satisfy also that the required delay of the message of transmission bearer time equates and the requirement of non-jitter, and then realize time synchronized.
Embodiment three
Referring to Fig. 9, present embodiment provides the equipment of the message of a kind of transmission bearer time, and this equipment comprises:
Sending module 904 is used for after the message of 903 pairs of carrying times of delay compensation module carries out delay compensation the message of carrying time being transmitted.
Wherein, computing module 902, specifically be used for the timestamp information that the message of carrying time of receiving according to local real-time time information and receiver module 901 is labeled, adopt local clock or the Network Synchronization clock calculation deferred message of message in transmission course of carrying time.
In sum, the equipment that present embodiment provides, carry out delay compensation by message to carrying time of receiving, and satisfy default message that again should the carrying time after postponing to require in time of delay and send, thereby message that should the carrying time remains on fixed value the time of delay in transmission course, make the DSL system can satisfy also that the required delay of the message of transmission bearer time equates and the requirement of non-jitter, and then realize time synchronized.
Embodiment four
Referring to Figure 10, present embodiment provides a kind of DSL system, and this system comprises: receiving equipment 1001 and transmitting apparatus 1002;
Wherein, transmitting apparatus 1002, specifically be used for when the deferred message of the message that calculates the carrying time in transmission course, according to the message timestamp information that be labeled of local real-time time information, adopt local clock or the Network Synchronization clock calculation deferred message of message in transmission course of carrying time with the carrying time.
In addition, transmitting apparatus 1002 specifically is used for the deferred message that calculates in basis, when the message that carries the time is carried out delay compensation, according to the deferred message that calculates, the message of buffer memory carrying time satisfies the default requirement that postpones until the time of delay of the message of carrying time.
The system that present embodiment provides, by transmitting apparatus the message of carrying time of receiving is carried out delay compensation, and satisfy default message that again should the carrying time after postponing to require in time of delay and send, thereby message that should the carrying time remains on fixed value the time of delay in transmission course, make the DSL system can satisfy also that the required delay of the message of transmission bearer time equates and the requirement of non-jitter, and then realize time synchronized.
Need to prove: the equipment of the message of the transmission bearer time that the foregoing description provides is when the transmitting synchronous message, only the division with above-mentioned each functional module is illustrated, in the practical application, can as required the above-mentioned functions distribution be finished by different functional modules, the internal structure of the equipment of being about to is divided into different functional modules, to finish all or part of function described above.In addition, the equipment of the message of the transmission bearer time that the foregoing description provides is the transmitting apparatus in the DSL system, the equipment of the message of this transmission bearer time, DSL system and the method for message embodiment of transmission bearer time all belong to same design, its specific implementation process sees method embodiment for details, repeats no more here.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
Part steps in the embodiment of the invention can utilize software to realize that corresponding software programs can be stored in the storage medium that can read, as CD or hard disk etc.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the method for message of a transmission bearer time is characterized in that, described method comprises:
Receive the message of carrying time, the message of described carrying time is labeled timestamp information;
Timestamp information according to local real-time time information and the message of described carrying time are labeled calculates the deferred message of message in transmission course of described carrying time;
According to the described deferred message that calculates, the message of described carrying time is carried out delay compensation, and time of delay satisfy default postpone to require after, the message of described carrying time is transmitted.
2. method according to claim 1 is characterized in that, described timestamp information is by the receiving equipment mark, and receives the time of the message of described carrying time for described receiving equipment.
3. method according to claim 1 is characterized in that, the deferred message of message in transmission course of described carrying time of described calculating specifically comprises:
Adopt local clock or the deferred message of message in transmission course of described carrying time of Network Synchronization clock calculation.
4. method according to claim 1 is characterized in that, the described deferred message that described basis calculates carries out delay compensation to the message of described carrying time, specifically comprises:
According to the described deferred message that calculates, the message of described carrying time of buffer memory satisfies described default delay requirement until the time of delay of the message of described carrying time.
5. the device of the message of a transmission bearer time is characterized in that, described device comprises:
Receiver module is used to receive the message of carrying time, and the message of described carrying time is labeled timestamp information;
Computing module is used for the timestamp information that the message of described carrying time of receiving according to local real-time time information and described receiver module is labeled, and calculates the deferred message of message in transmission course of described carrying time;
Delay compensation module is used for the described deferred message that calculates according to described computing module, and the message of described carrying time is carried out delay compensation, satisfies the default requirement that postpones until the time of delay of the message of described carrying time;
Sending module is used for after described delay compensation module is carried out delay compensation to the message of described carrying time the message of described carrying time being transmitted.
6. device according to claim 5, it is characterized in that, described computing module, specifically be used for the timestamp information that the message of described carrying time of receiving according to local real-time time information and described receiver module is labeled, adopt local clock or the deferred message of message in transmission course of described carrying time of Network Synchronization clock calculation.
7. device according to claim 5, it is characterized in that described delay compensation module specifically is used for the described deferred message that calculates according to described computing module, the message of described carrying time of buffer memory satisfies the default requirement that postpones until the time of delay of the message of described carrying time.
8. a digital subscriber line DSL system is characterized in that described system comprises: receiving equipment and transmitting apparatus;
Described receiving equipment, the timestamp information when being used for packet labeling to carrying time of receiving and receiving, and the message of described carrying time sent to described transmitting apparatus;
Described transmitting apparatus, be used to receive the message of the carrying time that sends by described receiving equipment, the timestamp information that is labeled according to local real-time time information and the message of described carrying time, calculate the deferred message of message in transmission course of described carrying time, and according to the described deferred message that calculates, message to the described carrying time carries out delay compensation, after satisfying default delay requirement time of delay, the message of described carrying time is transmitted.
9. system according to claim 8, it is characterized in that, described transmitting apparatus specifically is used for adopting local clock or the deferred message of message in transmission course of described carrying time of Network Synchronization clock calculation when the deferred message of the message that calculates the described carrying time in transmission course.
10. system according to claim 8, it is characterized in that, described transmitting apparatus, specifically be used for according to the described deferred message that calculates, when the message of described carrying time is carried out delay compensation, according to the described deferred message that calculates, the message of described carrying time of buffer memory satisfies described default delay requirement until the time of delay of the message of described carrying time.
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| CN115208837A (en) * | 2022-07-26 | 2022-10-18 | 武汉烽火技术服务有限公司 | Message scheduling method and system |
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