CN103647615A - Method and apparatus for delay jitter elimination during message transmission process - Google Patents
Method and apparatus for delay jitter elimination during message transmission process Download PDFInfo
- Publication number
- CN103647615A CN103647615A CN201310654822.7A CN201310654822A CN103647615A CN 103647615 A CN103647615 A CN 103647615A CN 201310654822 A CN201310654822 A CN 201310654822A CN 103647615 A CN103647615 A CN 103647615A
- Authority
- CN
- China
- Prior art keywords
- object message
- bit number
- message
- stamp
- bit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The embodiment of the invention provides a method and apparatus for delay jitter elimination during a message transmission process. The method comprises the following steps that: before stamp taking is carried out on a target message, the bit of the target message is increased and the length of the target message is adjusted , so that the length of the target message reaches a preset one; stamp taking is carried out on the target message at a stamp taking point so as to obtain a first timestamp of the target message; whether an indication code of the target message is received is detected at the stamp taking point; if no indication code is detected, a current counting value of a first counter is obtained and is used as a target bit number, wherein a bit number is subtracted from the first counter after one work cycle each time and is also one going out of a stack outgoing point in the work cycle; and according to the target bit number and the first timestamp, a second timestamp at the stack outgoing point at current moment is obtained. According to the invention, the length of the target message is adjusted before stamp taking and the to-be-transmitted bit number in a protocol stack is measured by the counter, thereby realizing delay jitter correction and eliminating the delay jitter during the transmission.
Description
Technical field
The present invention relates to the communication technology, relate in particular to delay jitter removing method and device in a kind of message transmission procedure.
Background technology
Accurate clock synchronization protocol (Precise Time Protocol is called for short PTP) is a kind of clock synchronization protocol based on message, in order to realize Frequency Synchronization and the time synchronized between equipment and equipment.Fig. 1 is the process of PIP message discrepancy protocol stack.As shown in Figure 1, in PTP agreement, PTP message is got to time stamp, to record PTP message, enter protocol stack and go out the moment point of protocol stack.
At current net environment, PTP message need to be carried in underlying protocol.When PTP message enters protocol stack, from stacked, to getting time stamp point, need to process through underlying protocol, correspondingly, when going out protocol stack, after taking time stamp, also need to process through underlying protocol.But in the process of processing in underlying protocol, may be owing to processing that path is long, processing unit is more or the factor such as wide coupling, make PTP message get time stamp point (Ingress Delay) or from getting time stamp point, be transferred to the process of the point of popping (Egress Delay) being transferred to from stacked point, in propagation delay time, can have larger delay jitter.These delay jitters are tens nanoseconds, at most tens or nanosecond up to a hundred at least, have a strong impact on the precision that clock time recovers.
At present, the method for obtaining delay jitter data comprises: circuit analysis method and emulation advocate approach.
(1) circuit analysis method: for after realizing the circuit design of protocol stack and completing, design engineer can analyze the formation of Ingress Delay and Egress Delay, according to each component part, phone is divided into a plurality of unit, analyze the impact of each unit on whole delay jitter, to get the delay jitter of message in transmitting procedure, then utilize this delay jitter to obtain the propagation delay time of message.
(2) for after realizing the circuit design of protocol stack and completing, checking engineer constructs various incentive conditions, by various incentive condition exciting circuits, form different simulation waveforms, then analyze the simulation waveform under various incentive conditions, get the delay jitter under various excitations, then utilize delay jitter to obtain the propagation delay time of message.
Above-mentioned two kinds of methods that get delay jitter data, require circuit simply can not analyze more complicated circuit, have limitation.And by above-mentioned two kinds of methods, the delay jitter getting is accurate not, make to utilize the propagation delay time that delay jitter gets to have certain error.
Summary of the invention
The embodiment of the present invention provides delay jitter removing method and device in a kind of message transmission procedure, and for eliminating message in the process of protocol stack transmission, the delay jitter of existence, to improve the synchronous precision of message.
Embodiment of the present invention first aspect provides delay jitter removing method in a kind of message transmission procedure, comprising:
Object message is being got before stamp, and the bit that increases described object message is adjusted the length of described object message, so that the length of described object message reaches preset length;
Described object message is got to stamp getting stamp point, obtain the first time stamp of described object message;
At the described stamp point of getting, detect the indication code that whether receives described object message;
If described indication code do not detected, get the current count value of the first counter as target bit; Wherein, every through a work period, described the first counter deducts a bit number, and described bit number is the bit number of putting away from popping in the described work period;
According to described target bit and described the first time stamp, get pop second time stamp at a place of described current time.
Embodiment of the present invention second aspect provides delay jitter cancellation element in a kind of message transmission procedure, comprising:
Pretreatment module, for object message is being got before stamp, the bit that increases described object message is adjusted the length of described object message, so that the length of described object message reaches preset length;
Get stamp module, for described object message being got to stamp getting stamp point, obtain the first time stamp of described object message;
First detection module, for detecting at the described stamp point of getting the indication code that whether receives described object message;
The first counting module, for the transmitting procedure in described object message, counts described object message; Wherein, every through a work period, described the first counting module deducts a bit number, and described bit number is the bit number of putting away from popping in the described work period;
Acquisition module, if for described indication code not detected, gets the current count value of described the first counting module as target bit;
Computing module, for according to described target bit and described the first time stamp, gets pop second time stamp at a place of described current time.
The embodiment of the present invention provides delay jitter removing method and device in a kind of message transmission procedure, object message is being got before stamp, increase the length of the bit adjustment aim message of object message, so that the length of object message reaches preset length, described object message is got to stamp getting stamp point, obtain the first time stamp of described object message, at the described stamp point of getting, detect the indication code that whether receives described object message, if described indication code do not detected, get the current count value of the first counter as target bit, wherein, every through a work period, described the first counter deducts a bit number, described bit number is the bit number of putting away from popping in the described work period, according to described target bit and described the first time stamp, get pop second time stamp at a place of described current time.The present embodiment is before getting stamp point, the length adjustment of object message is arrived to default length, by the first counter, measure in real time actual bit number waiting for transmission in protocol stack, realized the correction to delay jitter, can eliminate the delay jitter in message transmission procedure, improve the accuracy rate of propagation delay time, improved the precision of message.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of PTP message discrepancy protocol stack;
The schematic diagram of delay jitter removing method in a kind of message transmission procedure that Fig. 2 provides for the embodiment of the present invention;
The schematic diagram of delay jitter removing method in the another kind of message transmission procedure that Fig. 3 provides for the embodiment of the present invention;
The structural representation of delay jitter cancellation element in a kind of message transmission procedure that Fig. 4 provides for the embodiment of the present invention;
The structural representation of delay jitter cancellation element in the another kind of message transmission procedure that Fig. 5 provides for the embodiment of the present invention;
The structural representation of a kind of Ethernet 100GBASE-R bogey that Fig. 6 provides for the embodiment of the present invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Existing bogey is being got after time stamp object message, object message is transferred to popping a little of protocol stack from getting stamp point under the carrying of bogey, from getting, stabbing point to the transmitting procedure of popping a little, existing bogey comprises a plurality of processing modules according to protocol generation, can process object message, as (Frame Check Sequence Calculate is called for short FCS Calculate), coding, scrambling etc. are calculated in frame sequence verification.After above-mentioned processing, after getting stamp point, the length of object message often increases.Because the length of object message constantly changes to the length between popping a little getting stamp point, tracking target message is put to the propagation delay time of popping a little from getting to stab in real time.
The bogey that in the message transmission procedure that following embodiment provides, the executive agent of delay jitter removing method is protocol stack.To be transferred to the process that protocol stack pops a little be example from getting stamp point to take object message, and the process of delay jitter elimination in the message transmission procedure that following embodiment provides is described.As, bogey can be Ethernet 40/100GBASE-R bogey.
The schematic diagram of delay jitter removing method in a kind of message transmission procedure that Fig. 2 provides for the embodiment of the present invention.As shown in Figure 2, the method comprises the following steps:
101, object message is being got before stamp, the bit that increases described object message is adjusted the length of described object message, so that the length of described object message reaches preset length.
For the length that guarantees object message is to get stamp point constant or can expect to the length between popping a little, so that the propagation delay time of object message is carried out to real-time tracking.In the present embodiment, object message is being got before stamp, bogey carries out preliminary treatment to object message, in object message, increases bit, so that the length of object message reaches default length.
Particularly, if 1 passage (LANE) transmission objectives message is only set on bogey, length for fear of object message after getting stamp sends variation, bogey can increase the dummy bit position of preset length for object message, this preset length can arrange flexibly according to the actual demand of protocol stack.Illustrate, while transmitting on this LANE that object message is arranging in prior art, bogey carries out after checking treatment object message, obtain the check results of this object message, and check results is added in object message, causing the length of object message to increase the bit identical with check results length, just there is variation in the length of getting so the rear object message of stamp point.In the present embodiment, due to object message get stamp point before, bogey carries out preliminary treatment to object message, bogey can be in advance for object message increase length-specific for writing the dummy bit of above-mentioned check results.From getting, stab point to popping a process of transmission objectives message, bogey will carry out the check results after checking treatment to object message, writes in the dummy bit of the length-specific increasing in advance, thereby makes to get the constant of the rear object message length of stamp point.It will be recognized by those skilled in the art that dissimilar object message and the difference of check results, the length of reserved dummy bit position can be different, and the length of dummy bit can arrange according to actual needs flexibly.
If at least 2 LANE transmission objectives messages are set on bogey.Wherein, an object message of every upper transmission of LANE, the object message of every upper transmission of LANE is different.In actual applications, for the object message popping and locating to align and transmit on every LANE, bogey is that the object message of the upper transmission of every LANE is added an alignment identification (Alignment Marker is called for short AM).Wherein, AM is for locating the object message of aliging popping.In many LANE synchronous transmission object message situation, bogey, when sending object message, after the AM of alignment object message, then is transferred to object message to pop a little.At a place of popping, receive after object message, bogey shifts out the transmission crooked (Skew) between the object message of the upper transmission of each LANE, by the AM of each object message of aliging, and the object message of aliging.
In the present embodiment, for fear of the length of object message after getting stamp point, send and change, bogey is the object message of the upper transmission of every LANE, in object message, insert in advance an AM, and be the dummy bit position of the reserved length-specific of object message, carry out the length of adjustment aim message, make the length of object message reach default length.Wherein, from getting, stabbing point to popping a process of transmission objectives message, bogey can write bogey object message is carried out to the check results after verification in reserved dummy bit.
Illustrate, when object message is 1588 message, 1588 messages transmit on Ethernet 100GBASE-R bogey.Wherein, on 100GBASE-R bogey, be provided with 20 LANE, on every LANE, transmitted 1588 messages.In the present embodiment, 100GBAES-R bogey increases the dummy bit position of 96 bits in advance for 1588 messages of the upper transmission of every LANE.100GBAES-R bogey writes an AM in 64 reserved dummy bits.From getting, stabbing point to popping a process of transmission 1588 messages, 100GBASE-R bogey carries out FCS Calculate processing to 1588 messages, obtains the check results of 32.100GBASE-R writes remaining 32 dummy bits by the check results of 32.After above-mentioned preliminary treatment, make 1588 messages from getting stamp point to the process of a transmission of popping, the length of 1588 messages is always constant.In the present embodiment, owing to having added AM in 1588 messages that transmit on every LANE, at a place of popping, can carry out by this AM 1588 messages of the upper transmission of every the LANE that aligns.It will be recognized by those skilled in the art that length and 32 dummy bits of AM are only example herein, the length of the dummy bit position that dissimilar object message need to be reserved can be different, can arrange flexibly according to the type of message.
102, described object message is got to stamp getting stamp point, obtain the first time stamp of described object message.
After receiving the object message of preset length, bogey is got time stamp to object message getting stamp point, must this object message get first time stamp at stamp point place at this.
103, at the described stamp point of getting, detect the indication code that whether receives described object message.
Object message is got after stamp getting stamp point, bogey further checks the indication code that whether receives object message getting stamp point.If bogey does not detect the indication code of object message, execution step 104; If bogey detects the indication code of object message, execution step 105.
104, the current count value that gets the first counter is as target bit; Wherein, every through a work period, described the first counter deducts a bit number, and described bit number is the bit number of putting away from popping in the described work period.
First counter is set in bogey, by this first counter, gets current time, in protocol stack, from getting, stab point to the some bit number waiting for transmission of popping.Wherein, the first counter is arranged on and gets stamp point place.
In the present embodiment, every through a work period, the first counter just deducts a specific bit number on the basis of current count value.This bit number is in each work period, the bit number a little sending out from popping.In the present embodiment, set the bit number of putting away from popping in the unit interval identical, the work period of the first counter is set to the unit interval, and the specific bit number that the first counter increases is set to the bit number of putting away from popping in the unit interval.In object message, from getting stamp point, transfer to the process of popping a little, bogey can get the current count value of the first counter as target bit.Wherein, target bit is bit number waiting for transmission in current time protocol stack.
Utilize the first counter unit interval of every arrival, correspondingly from the basis of current count value, deduct this principle of bit number of going out in this unit interval from protocol stack, the present embodiment can measure actual bit number waiting for transmission in protocol stack in real time, can eliminate the delay jitter of object message when transmission.
105, indicate described the first counter the total bit number of described current count value and described object message is done and, to obtain described target bit.
In the heading of general objectives message, can carry the indication code of an object message.If the indication code of object message detected in step 103, explanation has an object message to enter protocol stack.Take up device and indicate the first counter on the basis of current count value, increase the length of this object message, the bit number carrying in this object message.Particularly, the middle bit number of the current count value of the first counter and object message is done and, obtain target bit.
When object message is 1588 message, actual 64 Bit datas that carried of 1588 messages, but 100GBASE-R bogey has adopted 64/66 coding rule, after 1588 messages are encoded, the length of 1588 messages can become 66 bits, therefore,, after the indication code of 1588 messages being detected, the current count value of the first counter can increase by 66.
106,, according to described target bit and described the first time stamp, get pop second time stamp at a place of described current time.
In the present embodiment, in default each work period, the bit number a little sending out from popping is specific bit number.According to target bit and the first time stamp, get pop second time stamp at a place of current time, in the present embodiment, concrete formula is:
Second time stamp=the first time stamp+target bit/bit number.
Therefore, bogey can be made ratio by target bit waiting for transmission and bit number in protocol stack, to obtain from getting stamp point to the transmission time of popping a little, then by transmission time and the first time stamp work and, second time stamp at a place that obtains popping.
Delay jitter removing method in the message transmission procedure that the present embodiment provides, object message is being got before stamp, increase the length of the bit adjustment aim message of object message, so that the length of object message reaches preset length, described object message is got to stamp getting stamp point, obtain the first time stamp of described object message, at the described stamp point of getting, detect the indication code that whether receives described object message, if described indication code do not detected, get the current count value of the first counter as target bit, wherein, every through a work period, described the first counter deducts a bit number, described bit number is the bit number of putting away from popping in the described work period, according to described target bit and described the first time stamp, get pop second time stamp at a place of described current time.The present embodiment is before getting stamp point, the length adjustment of object message is arrived to default length, thereby bit in can real-time follow-up object message, and measure in real time bit number waiting for transmission in protocol stack by the first counter, realize the correction to delay jitter, can eliminate the delay jitter existing in message transmission procedure.
The schematic diagram of delay jitter removing method in the another kind of message transmission procedure that Fig. 3 provides for the present embodiment.As shown in Figure 3, the method comprises the following steps:
201, object message is being got before stamp, the bit that increases described object message is adjusted the length of described object message, so that the length of described object message reaches preset length.
202, described object message is got to stamp getting stamp point, obtain the first time stamp of described object message.
Step 201～step 202 is identical with step 101～102 in above-mentioned example, and detailed process can, referring to the record of related content in above-described embodiment, repeat no more herein.
203, described object message from described get stamp point to described in the transmitting procedure of popping a little, to described object message, add and the correction request of described object message synchronous transmission.
In practical application, the first counter may be interfered, and makes the current count value of the first counter send larger variation, in the present embodiment, in order to guarantee the accuracy of the first counter, can to the current count value of the first counter, proofread and correct by correction request.
Bogey after completing preliminary treatment, transmission objectives message in protocol stack.In object message, from getting stamp point to the transmitting procedure of popping a little, bogey can add correction request in object message, this correction request and object message synchronous transmission.Alternatively, correction request can be bundled in object message or by with outside the mode followed, synchronously in protocol stack, transmit with object message.In the present embodiment, binding can be understood as, and certain bit and correction request in object message are transmitted on LANE in synchronous regime always.
204, add described correction request first constantly, obtain described the first counter at the described first current count value constantly as the first bit number, and trigger the second counter simultaneously and count; Wherein, every through a work period, described the second counter adds described bit number.
In the present embodiment, to object message, add correction request first constantly, bogey get the first counter at the first current count value constantly as the first bit number.Further, in first moment, bogey also needs to trigger the second counter simultaneously to be counted.Wherein, the second counter is set in bogey, this second counter is every through a work period, and the second counter adds a specific bit number on the basis of current count value, and this bit number is the bit number a little sending out from popping in the work period.Wherein, correction request can set high pulse for one, when bogey sends this and sets high pulse to object message, this is set high to pulse and send to the first counter, by setting high pulse, triggers the second counter and counts from zero.Alternatively, bogey also can trigger the second counter by other means, but must guarantee at first time trigger the second counter.
Wherein, the second counter has the work period, and when arriving a work period, the second counter can increase a fixed numbers.In the present embodiment, set the bit number of putting away from popping in the unit interval identical.Therefore, the work period of the second counter is set to the unit interval, and the fixed numbers that the second counter increases is set to the bit number of putting away from popping in the unit interval.
205, locate to detect described correction request popping, and detect described correction request second constantly, obtain described the second counter at the described second current count value constantly and described the first counter at the described second current bit number constantly as the second bit number.
In the present embodiment, bogey can detect in real time a place of popping and whether receive correction request.Some bit synchronous transmission in correction request and object message, when this bit reaches while popping, also can reach and pop a little with the correction request of object message synchronous transmission, and now, bogey just can detect correction request at a place of popping.
The moment that the present embodiment detects correction request using bogey is as second moment.Bogey can get the current count value in second moment from the second counter.Particularly, bogey constantly sends to proofread and correct to the second counter second and finishes indication, and the second counter receives to proofread and correct and finishes after indication, and the second counter stops counting, and current count value is returned to bogey.
The present embodiment can record from a little actual bit number sending out of popping in real time by the second counter.When obtaining the current count value of the second counter, bogey also need to get the current count value in second moment as the second bit number from the first counter.
206, according to described the first bit number, described the second bit number and described current count value, obtain described target bit.
After getting the current count value of the first bit number, the second bit number and the second counter, bogey can, according to default formula, can obtain target bit.Wherein, default formula is as follows:
Target bit=the second bit number+(current count value-the first bit number of the second counter).
Known in above-mentioned steps 202 and step 203, the first bit number is bit number waiting for transmission in the protocol stack of the first prediction constantly, and the current count value of the second counter to be object message be transferred to the process of popping a little from getting stamp point, the bit number that reality is a little sent from popping.Difference between the current count value of the second counter and the first bit number, as the bit number of going out from protocol stack of prediction and the error bit number of actual bit number of going out from protocol stack.After getting this error bit number, bogey by this error bit and the second bit number and value, as from getting stamp point to the process of popping a little, can be from the protocol stack a little actual target bit sending out of popping.
In practical application, bogey does not need in real time the first counter to be proofreaied and correct, and can periodically to the first counter, proofread and correct, to guarantee the accuracy of the current count value of the first counter.After getting the current count value of the second counter and the difference of the first bit number, bogey can utilize above-mentioned error bit number to proofread and correct the first counter, the current count value of the first counter is updated to target bit, thus the error that corrigendum the first counter occurs.Upper once, after calibration cycle reaches, the object message of again transmitting by current time, proofreaies and correct the current count value of the first counter.
207,, according to described target bit and described the first time stamp, get pop second time stamp at a place of described current time.
Particularly, after obtaining target bit, bogey is made ratio by target bit and the bit number that a little sends out from popping in the unit interval, obtains from getting stamp point to the propagation delay time popping a little.Wherein, the bit number a little sending out from popping in each unit interval is identical bit number.
Delay jitter removing method in the message transmission procedure that the present embodiment provides, object message is being got before stamp, increase the length of the bit adjustment aim message of object message, so that the length of object message reaches preset length, in object message, from getting stamp point, transfer to the process of popping a little, correction request to object message interpolation with object message synchronous transmission, and add correction request first constantly, obtain the current value of the first counter as the first bit number, trigger the second counter counts simultaneously, locate to detect correction request popping, and in second moment that correction request detected, obtain the current count value of the second counter and at the current count value of the first counter as the second bit number, according to default check formula, according to the first bit number, the second bit number and the second counter current count value, get from getting stamp point to the propagation delay time of popping a little.The present embodiment is before getting stamp point, the length adjustment of object message is arrived to default length, thereby the bit in can real-time follow-up object message, and measure in real time bit number waiting for transmission in protocol stack by the first counter, realize the correction to delay jitter, can get rid of delay jitter.
Further, by correction request, the first counter is proofreaied and correct, to guarantee the correctness of the current count value of the first counter, improved the accuracy rate of obtaining propagation delay time, be conducive to the synchronous transmission of message.
The structural representation of delay jitter cancellation element in a kind of message transmission procedure that Fig. 4 provides for the embodiment of the present invention.In the message transmission procedure that following embodiment provides, delay jitter cancellation element can be the bogey of agreement.To transfer to the process of popping be a little example from getting stamp point to take object message, and the message transmissions time delay device that following embodiment provides is described.As shown in Figure 4, this bogey comprises: pretreatment module 41, get stamp module 42, first detection module 43, the first counting module 44, acquisition module 45 and computing module 46.
Wherein, for the length that guarantees object message is to get stamp point constant or can expect to the length between popping a little, so that the propagation delay time of object message is carried out to real-time tracking.Object message is being got before stamp, and pretreatment module 41 increases the bit of object message, and the length of adjustment aim message, so that the length of object message reaches default length.Particularly, file destination is carried out to pretreated process, can, referring to the record of related content in above-described embodiment, repeat no more herein.
Get stamp module 42 and is connected with first detection module 43, object message is got after stamp getting stamp point, first detection module 43 is being got a stamp detection and whether is receiving the indication code of object message.In the present embodiment, first counting module 44 is set in bogey, alternatively, the first counting module 44 can be the first counter.In the present embodiment, by this first counter, get in current time protocol stack from getting stamp point to the reality bit number waiting for transmission of popping.Wherein, the first counter is arranged on and gets stamp point place.
Wherein, every through a work period, the first counter just deducts a specific bit number on the basis of current count value.This bit number is in each work period, the bit number a little sending out from popping.In the present embodiment, set the bit number of putting away from popping in the unit interval identical, the work period of the first counter is set to the unit interval, and the specific bit number that the first counter increases is set to the bit number of putting away from popping in the unit interval.
Utilize the first counter unit interval of every arrival, correspondingly, from the basis of current count value, deduct the bit number of going out in this unit interval from protocol stack, the first counter can predict bit number waiting for transmission in protocol stack in real time.In the protocol stack that or not first counter does not predict in the same time, bit number waiting for transmission is different, using the current count value of the first counter as target bit.The present embodiment, by the above-mentioned counting process of the first counter, can be eliminated the delay jitter of object message when transmission.
At first detection module 43, be also connected with acquisition module 45, when the indication code of object message not detected, acquisition module 45 can get current count value from the first counting module 44, as target bit.Wherein, target bit is bit number waiting for transmission in current time protocol stack.
Further, in the heading of general objectives message, can carry the indication code of an object message.When first detection module 43 detects the indication code of object message, illustrated that an object message enters protocol stack.First detection module 43 can indicate the first counting module 44 on the basis of current count value, increases total bit number of object message, obtains target bit.
When object message is 1588 message, actual 64 Bit datas that carried of 1588 messages, but 100GBASE-R bogey has adopted 64/66 coding rule, after 1588 messages are encoded, the length of 1588 messages can become 66 bits, therefore,, after the indication code of 1588 messages being detected, the current count value of the first counter can increase by 66.
In the present embodiment, in default each work period, the bit number a little sending out from popping is specific bit number.Acquisition module 45 is connected with computing module 46, according to target bit and the first time stamp, gets pop second time stamp at a place of current time, and in the present embodiment, concrete formula is:
Second time stamp=the first time stamp+target bit/bit number.
Therefore, computing module 46 can be made ratio by target bit and bit number, to obtain from getting stamp point to the transmission time of popping a little, then by transmission time and the first time stamp work and, second time stamp at a place that obtains popping.
Delay jitter cancellation element in the message transmission procedure that the present embodiment provides, object message is being got before stamp, increase the length of the bit adjustment aim message of object message, so that the length of object message reaches preset length, object message is got to stamp getting stamp point, obtain the first time stamp of object message, detect the indication code that whether receives object message getting stamp point, if indication code do not detected, get the current count value of the first counter as target bit, wherein, every through a work period, the first counter deducts a bit number, bit number is the bit number of putting away from popping in the work period, according to target bit and the first time stamp, get pop second time stamp at a place of current time.The present embodiment is before getting stamp point, the length adjustment of object message is arrived to default length, thereby bit in can real-time follow-up object message, and measure in real time actual target bit waiting for transmission in protocol stack by the first counter, realize the correction to delay jitter, can eliminate the delay jitter existing in message transmission procedure.
Fig. 5 for the embodiment of the present invention provide the structural representation of delay jitter cancellation element in another kind of message transmission procedure.As shown in Figure 5, this device, except comprising pretreatment module 41 in above-mentioned example, getting stamp module 42, first detection module 43, the first counting module 44, acquisition module 45 and computing module 46, also comprises: add module 47, the second counting module 48, trigger module 49, the second detection module 50 and writing module 51.
About pretreatment module 41, associated description and the annexation of getting stamp module 42, first detection module 43, the first counting module 44, acquisition module 45 and computing module 46, can, referring to the record of related content in above-described embodiment, repeat no more herein.
After 41 pairs of object message preliminary treatment of pretreatment module, in protocol stack in the process of transmission objectives message, add module 47 and can add a correction request with object message synchronous transmission to object message.Alternatively, correction request can be bundled in object message or by with outside the mode followed, synchronously in protocol stack, transmit with object message.In the present embodiment, the moment of adding correction request to object message is become to first constantly.
In the present embodiment, to object message, add correction request first constantly, acquisition module 45 obtain the first counting module 44 at the first current count value constantly as the first bit number.Further, in the first time trigger module 49, trigger the second counting module 48 counts simultaneously.
In the present embodiment, correction request can set high pulse for one, adds module 47 when sending this and set high pulse to object message, and this is set high to pulse sends to the second counting module 48, sets high pulse-triggered the second counting module 48 count by this.Wherein, the second counting module 48 can be a counter.Alternatively, trigger by other means the second counting module 48, but must guarantee at first time trigger the second counting module 48.Wherein, the process of the second counting module 48 countings can, referring to the record of related content in above-mentioned example, repeat no more herein.
In the present embodiment, the second detection module 50 is arranged on a place of popping, and detects in real time a place of popping and whether receives correction request.Some bit synchronous transmission in correction request and object message, when this bit is transferred to while popping, this correction request also synchronously arrives and pops a little, and now, the second detection module 50, at a place of popping, can detect correction request.In the present embodiment, the moment that the second detection module 50 is detected to correction request, as second moment, sends to proofread and correct to the second counting module 48 at second moment the second detection module 50 and finishes to indicate.The second counter 48 receives to proofread and correct and finishes after indication, and the second counting module 48 stops counting, and the second counting module 48 second current count value is constantly sent to acquisition module 45.In the present embodiment, by the second counting module 48, can record in real time from a little actual bit number sending out of popping.
When obtaining the current count value in second 48 second moment of counting module, acquisition module 45 also need to get the current count value in second moment as the second bit number from the first counting module 44.
After getting the current count value of the first bit number, the second bit number and the second counting module 48, acquisition module 45 can, according to default formula, can obtain target bit.About acquisition module 45, according to default formula, obtain the process of target bit, can, referring to the record of related content in above-described embodiment, repeat no more herein.
In practical application, bogey does not need in real time the first counter to be proofreaied and correct, and can periodically to the first counter, proofread and correct, to guarantee the accuracy of the current count value of the first counter.Acquisition module 45 is connected with the first counting module 44, after getting the current count value of the second counter and the difference of the first bit number, the first counting module 44 can utilize above-mentioned error bit number to proofread and correct the first counting module 44, the current count value of the first counting module 44 is updated to target bit, thus the error of the first counter that corrigendum occurs.Upper once, after calibration cycle reaches, the object message of again transmitting by current time, proofreaies and correct the first counter.
After obtaining target bit, counting module 46 is made ratio by target bit and the bit number that a little sends out from popping in the unit interval, obtains from getting stamp point to the propagation delay time popping a little.Wherein, the bit number a little sending out from popping in each unit interval is identical bit number.
In the present embodiment, writing module 51 in this message transmission procedure in delay jitter cancellation element is stabbing point to popping a process of transmission objectives message from getting, in the reserved dummy bit of pretreatment module 41, write the check results of object message being carried out to checking treatment.Or from getting, stabbing point to popping a process of transmission objectives message, writing module 51, in the reserved dummy bit of pretreatment module 41, writes check results and the AM of object message.
Delay jitter cancellation element in the message transmission procedure that the present embodiment provides, by object message is got before stamp, increase the length of the bit adjustment aim message of object message, real-time follow-up is to stabbing point to the propagation delay time of popping a little from getting, according to this propagation delay time and first time stamp of getting stamp point place, get second time stamp of popping a little.The present embodiment is before getting stamp point, the length adjustment of object message is arrived to default length, thereby the bit in can real-time follow-up object message, and measure bit number waiting for transmission in protocol stack by the first counting module, realize the correction to delay jitter, can get rid of delay jitter.Further, by correction request, the first counting module is proofreaied and correct, to guarantee the correctness of the current count value of the first counting module, improved the accuracy rate of obtaining propagation delay time, be conducive to the synchronous transmission of message.
Further, by correction request, the first counter is proofreaied and correct, to guarantee the correctness of the current count value of the first counter, improved the accuracy rate of obtaining propagation delay time, be conducive to the synchronous transmission of message.
As a kind of possible implementation, in the message transmission procedure in the present embodiment, delay jitter cancellation element can be applicable in 1588 messages.Fig. 6 is the structural representation of delay jitter cancellation element in 1588 message transmission procedures.As shown in Figure 6, this transmission delay acquisition device is a kind of improvement to Ethernet 100GBASE-R bogey.Particularly, 100GBASE-R bogey comprises: Ethernet encapsulation (Ethernet Encapsulation) module 1, preliminary treatment (AM-Pre-insert) module 2, timestamp obtains with packet and revises (1588Get Timestamp & Modify Packet) module 3, (Frame Check Sequence Calculate is calculated in frame sequence verification, be called for short FCS Calculate) module 4, fifo queue (First Input First Output, be called for short FIFO) 5, encoder (Encoder) 6, scrambler (Scramble) 7, AM processor (Alignment Marker Process) 8, distributor (Distribution) 9, mixer (Gear box) 10, get stamp module 11, first detection module 12, the first counter 13, acquisition module 14, computing module 15, add module 16, the second detection module 17 and the second counter 18.
The data flow of 1588 messages enters Ethernet package module 1,1 pair of 1588 message of Ethernet package module encapsulate, then by pretreatment module 2, each 1588 message is increased to bit, adjust the length of 1588 messages, make the length of 1588 messages reach predetermined length.On 100GBASE bogey, be provided with 20 LANE, on every LANE, transmitted 1588 messages.Particularly, pretreatment module 2 increases the dummy bit position of 96 bits in advance for 1588 messages on every LANE.Pretreatment module 2 is that 1588 messages increase AM in 64 reserved bits.
Pretreatment module 2 is by after the AM alignment of each 1588 message, by the LANE of each 1588 message, send to acquisition time stamp and packet modified module 3, and be arranged on and get getting of stamp point place and stab 11 pairs of 1588 messages of module and get stamp, obtain the first time stamp, be designated as and get stamp value (ts_value).
Also be provided with first detection module 12 getting stamp point place, this first detection module 12 is for detection of the indication code that whether receives 1588 messages.When 1588 messages have just entered protocol stack, first detection module 12 can detect the indication code of 1588 messages.In reality, owing to being provided with 20 LANE on 100GBASE-R bogey, pretreatment module 2 can be chosen the indication code of 1588 messages on one of them LANE, sends to first detection module 12.As, the indication code that can choose 1588 messages of the upper transmission of LANE0 sends first detection module 12.After indication code being detected, can indicate the first counter 13 at the upper whole total bit number that adds 1588 messages of current count value.In the present embodiment, the first counter 13 increases by 66 on current count value.In reality, the bit number that carries of each 1588 message is 64 bits, but because encoder 6 adopts 64/66 coding rule, after coding, 64 bits can be changed into 66 bits, and therefore, the first counter 13 need to increase by 66 bits.The first counter 13 at 1588 messages from getting stamp point to the process of a transmission of popping, every through a work period, just from current count value, deduct a fixing bit number, to predict not in the same time bit number waiting for transmission in protocol stack.Wherein, fixing bit number is from a bit number of going out of popping in the work period.In the present embodiment, each work period is identical from a bit number of going out of popping.
Add that module 16 is obtained with timestamp and packet modified module 3 is parallel arranges, at 1588 messages, get stamp point place, add module 16 periodically to the correction request (adjust_start) of adding in 1588 messages with 1588 message synchronous transmission.This adjust_start is one and sets high pulse.In the present embodiment, the moment that interpolation module 16 is set high to pulse to 1588 messages interpolations is designated as first constantly.When acquisition module 14 obtained for first moment, the current count value of the first counter 13 is as the first bit number.
To 1588 messages, adding first moment that sets high pulse, interpolation module 16 needs to set high pulse and sends to the second counter 18, triggers the second counter 18 and counts from zero.The second counter 18 starts after counting, every through a work period, and just, on the basis of current count value, increasing a fixing bit number is from a bit number sending out of popping in the work period.
By added set high pulse 1588 message transmissions to frame sequence verification computing module 4,4 pairs of 1588 messages of frame sequence verification computing module carry out FCS Calculate processing, can obtain the check results of 32, the check results of 32 is write to 32 remaining dummy bits.After the processing of FIFO5, encoder 6 and scrambler 7,1588 messages are input to AM processor 8.
AM processor 8 shifts out the transmission Skew between each 1588 message, the AM of each 1588 message that align.By distributor 9 and mixer 10,1588 messages on 20 LANE are closed on the LANE of road to.The second detection module 17 is arranged on a place of popping, and for locating to detect adjust_start popping, if adjust_start detected, sends one immediately proofread and correct ending request (adjust_end) to the second counter 18.After receiving adjust_end, the second counter 18 stops calculating, and current count value is sent to acquisition module 14 as proofreading and correct result (adjust_result).In the present embodiment, be set as to second the moment that adjust_start detected at a place of popping constantly.Acquisition module 14 also needs the current count value that gets second moment the first counter 13 as the second bit number.
Getting the first bit number, the second bit number and the second counter 18 after the current count value in second moment, acquisition module 14 can get target bit.Wherein, acquisition module 14 obtains the process of target bit, can, referring to the record of related content in above-described embodiment, repeat no more herein.
After getting the target bit of 1588 messages, computing module 15 can, according to the first time stamp and target bit, obtain 1588 messages at second time stamp at a place of popping.
Delay jitter cancellation element in 1588 message transmission procedures that the present embodiment provides, by 1588 messages are got before stamp, increase the length of the bit adjustment aim message of 1588 messages, real-time follow-up is to stabbing point to the propagation delay time of popping a little from getting, according to this propagation delay time and first time stamp of getting stamp point place, get second time stamp of popping a little.The present embodiment is before getting stamp point, the length adjustment of 1588 messages is arrived to default length, thereby can real-time follow-up object message, and measure in real time bit number waiting for transmission in protocol stack by the first counter, eliminated the delay jitter that 1588 messages exist in transmitting procedure, can revise propagation delay time, the accuracy of the propagation delay time obtained that provides high, is conducive to the synchronous transmission of 1588 messages.
Finally it should be noted that: each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit above; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (16)
1. a delay jitter removing method in message transmission procedure, is characterized in that, comprising:
Object message is being got before stamp, and the bit that increases described object message is adjusted the length of described object message, so that the length of described object message reaches preset length;
Described object message is got to stamp getting stamp point, obtain the first time stamp of described object message;
At the described stamp point of getting, detect the indication code that whether receives described object message;
If described indication code do not detected, get the current count value of the first counter as target bit; Wherein, every through a work period, described the first counter deducts a bit number, and described bit number is the bit number of putting away from popping in the described work period;
According to described target bit and described the first time stamp, get pop second time stamp at a place of described current time.
2. delay jitter removing method in message transmission procedure according to claim 1, is characterized in that, also comprises:
If described indication code detected, indicate described the first counter that total bit number of described object message is added to described current count value, to obtain described target bit.
3. delay jitter removing method in message transmission procedure according to claim 1, is characterized in that, also comprises:
Described object message from described get stamp point to described in the transmitting procedure of popping a little, to described object message, add and the correction request of described object message synchronous transmission;
Add described correction request first constantly, obtain described the first counter at the described first current count value constantly as the first bit number, and trigger the second counter simultaneously and count; Wherein, every through a work period, described the second counter adds described bit number;
Described popping, locate to detect described correction request, and obtain described in current count value constantly of described the second counter second and described the first counter the second current bit number constantly as the second bit number; Wherein, described second constantly for detecting the moment of described correction;
The described current count value that obtains the first counter comprises as target bit:
Described current count value according to described the first bit number, described the second bit number and described the second counter, obtains described target bit.
4. delay jitter removing method in message transmission procedure according to claim 3, is characterized in that, described according to described the first bit number, described the second bit number and described current count value, obtains described target bit and comprises:
By the difference of the described current count value of described the second counter and described the first bit number, as error bit number;
By described the second bit number and described error bit number and value, as described target bit.
5. delay jitter removing method in message transmission procedure according to claim 4, is characterized in that, described according to described target bit and described the first time stamp, gets pop second time stamp at a place of described current time and comprises:
Described target bit and described bit number are made to ratio, obtain from described get stamp point to described in transmission time of popping a little;
By the described transmission time and described the first time stamp is done and, obtain described the second time stamp.
6. delay jitter removing method in message transmission procedure according to claim 4, is characterized in that, described by described the second bit number and described error bit number and value, after described target bit, also comprise:
Utilize described error bit number to revise described the first counter, the current count value of described the first counter is updated to described target bit.
7. delay jitter removing method in message transmission procedure according to claim 1, it is characterized in that, described object message is being got before stamp, the bit that increases described object message is adjusted the length of described object message, so that the length of described object message reaches preset length, comprises:
Object message is being got before stamp, for adjusting the length of described object message in the dummy bit position of the reserved length-specific of described object message, so that the length of described object message reaches preset length; Wherein, described dummy bit position for from described get stamp point to described in a process for the described object message of transmission of popping, write the check results of described object message being carried out to checking treatment.
8. delay jitter removing method in message transmission procedure according to claim 1, it is characterized in that, described object message is being got before stamp, the bit that increases described object message is adjusted the length of described object message, so that the length of described object message reaches preset length, comprises:
Object message is being got before stamp, in described object message, inserting alignment identification AM, and be the dummy bit position of the reserved length-specific of described object message; Wherein, described dummy bit position for from described get stamp point to described in a process for the described object message of transmission of popping, write the check results of described object message being carried out to checking treatment; Described AM is used at a described alignment identification AM for the described object message of alignment that pops.
9. a delay jitter cancellation element in message transmission procedure, is characterized in that, comprising:
Pretreatment module, for object message is being got before stamp, the bit that increases described object message is adjusted the length of described object message, so that the length of described object message reaches preset length;
Get stamp module, for described object message being got to stamp getting stamp point, obtain the first time stamp of described object message;
First detection module, for detecting at the described stamp point of getting the indication code that whether receives described object message;
The first counting module, for the transmitting procedure in described object message, counts described object message; Wherein, every through a work period, described the first counting module deducts a bit number, and described bit number is the bit number of putting away from popping in the described work period;
Acquisition module, if for described indication code not detected, gets the current count value of described the first counting module as target bit;
Computing module, for according to described target bit and described the first time stamp, gets pop second time stamp at a place of described current time.
10. delay jitter cancellation element in message transmission procedure according to claim 9, it is characterized in that, described acquisition module, also for if described indication code being detected, the total bit number of the described current count value of described the first counting module and described object message is done and, obtain described target bit.
11. according to delay jitter cancellation element in the message transmission procedure described in claim 9 or 10, it is characterized in that, also comprises:
Add module, for described object message from described get stamp point to described in the transmitting procedure of popping a little, to described object message, add and the correction request of described object message synchronous transmission;
Described acquisition module, also for add described correction request first constantly, obtain described the first counting module at the described first current count value constantly as the first bit number; And obtain current count value constantly of described the second counting module second and described the first counting module at the described second current bit number constantly as the second bit number, according to the described current count value of described the first bit number, described the second bit number and described the second counter, obtain described target bit, wherein, second the moment of described correction request constantly for described the second detection module, detected;
The second counting module, for counting the described bit number a little sending of popping; Wherein, every through a work period, described the second counting module adds described bit number;
Trigger module, for first moment adding described correction request, triggers described the second counting module simultaneously and counts;
Described the second detection module, for locating to detect described correction request described popping.
Delay jitter cancellation element in 12. message transmission procedures according to claim 11, it is characterized in that, described acquisition module is specifically for by the difference of the described current count value of described the second counter and described the first bit number, as error bit number, by described the second bit number and described error bit number and value, as described target bit.
Delay jitter removing method in 13. message transmission procedures according to claim 12, it is characterized in that, described computing module is specifically for making ratio by described target bit and described bit number, obtain from described get stamp point to described in transmission time of popping a little, by the described transmission time and described the first time stamp is done and, obtain described the second time stamp.
Delay jitter cancellation element in 14. message transmission procedures according to claim 12, it is characterized in that, described the first counting module, also, for utilizing described error bit number to revise described the first counting module, the current count value of described the first counting module is updated to described target bit.
Delay jitter cancellation element in 15. message transmission procedures according to claim 9, it is characterized in that, described pretreatment module is specifically for getting before stamp object message, for adjusting the length of described object message in the dummy bit position of the reserved length-specific of described object message, so that the length of described object message reaches preset length; Wherein, described dummy bit position for from described get stamp point to described in a process for the described object message of transmission of popping, write the check results of described object message being carried out to checking treatment.
16. according to delay jitter cancellation element in the message transmission procedure described in right 9, it is characterized in that, described pretreatment module is specifically for getting before stamp object message, in described object message, insert alignment identification AM, and be the dummy bit position of the reserved length-specific of described object message; Wherein, described dummy bit position for from described get stamp point to described in a process for the described object message of transmission of popping, write the check results of described object message being carried out to checking treatment; Described AM is used at a described alignment identification AM for the described object message of alignment that pops.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310654822.7A CN103647615B (en) | 2013-12-05 | 2013-12-05 | Delay jitter removing method and device in message transmission procedure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310654822.7A CN103647615B (en) | 2013-12-05 | 2013-12-05 | Delay jitter removing method and device in message transmission procedure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103647615A true CN103647615A (en) | 2014-03-19 |
| CN103647615B CN103647615B (en) | 2016-05-25 |
Family
ID=50252781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310654822.7A Active CN103647615B (en) | 2013-12-05 | 2013-12-05 | Delay jitter removing method and device in message transmission procedure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103647615B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107690073A (en) * | 2016-08-05 | 2018-02-13 | 阿里巴巴集团控股有限公司 | A kind of net cast method and Living streaming server |
| WO2019165965A1 (en) * | 2018-03-01 | 2019-09-06 | 中兴通讯股份有限公司 | Method, apparatus, and device for determining time information |
| CN112202519A (en) * | 2020-08-26 | 2021-01-08 | 浙江双成电气有限公司 | Method for controlling message transmission delay jitter |
| WO2021098733A1 (en) * | 2019-11-19 | 2021-05-27 | 深圳市中兴微电子技术有限公司 | Ethernet time synchronization method and apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100153055A1 (en) * | 2008-12-15 | 2010-06-17 | Verizon Business Network Services Inc. | Network testing |
| CN102130735A (en) * | 2010-11-09 | 2011-07-20 | 华为技术有限公司 | Transmission equipment and method thereof for realizing synchronization of clock and time |
| CN102232278A (en) * | 2011-06-23 | 2011-11-02 | 华为技术有限公司 | Method and device for detecting 1588 equipment performance |
| CN102868515A (en) * | 2012-09-27 | 2013-01-09 | 烽火通信科技股份有限公司 | System time synchronization device and method in packet transport network |
-
2013
- 2013-12-05 CN CN201310654822.7A patent/CN103647615B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100153055A1 (en) * | 2008-12-15 | 2010-06-17 | Verizon Business Network Services Inc. | Network testing |
| CN102130735A (en) * | 2010-11-09 | 2011-07-20 | 华为技术有限公司 | Transmission equipment and method thereof for realizing synchronization of clock and time |
| CN102232278A (en) * | 2011-06-23 | 2011-11-02 | 华为技术有限公司 | Method and device for detecting 1588 equipment performance |
| CN102868515A (en) * | 2012-09-27 | 2013-01-09 | 烽火通信科技股份有限公司 | System time synchronization device and method in packet transport network |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107690073A (en) * | 2016-08-05 | 2018-02-13 | 阿里巴巴集团控股有限公司 | A kind of net cast method and Living streaming server |
| CN107690073B (en) * | 2016-08-05 | 2021-07-16 | 阿里巴巴集团控股有限公司 | Video live broadcast method and video live broadcast server |
| WO2019165965A1 (en) * | 2018-03-01 | 2019-09-06 | 中兴通讯股份有限公司 | Method, apparatus, and device for determining time information |
| JP2021509797A (en) * | 2018-03-01 | 2021-04-01 | 中興通訊股▲ふん▼有限公司Ｚｔｅ Ｃｏｒｐｏｒａｔｉｏｎ | Time information determination method, equipment and devices |
| US11476962B2 (en) | 2018-03-01 | 2022-10-18 | Zte Corporation | Method, device and apparatus for determining time information |
| WO2021098733A1 (en) * | 2019-11-19 | 2021-05-27 | 深圳市中兴微电子技术有限公司 | Ethernet time synchronization method and apparatus |
| CN112202519A (en) * | 2020-08-26 | 2021-01-08 | 浙江双成电气有限公司 | Method for controlling message transmission delay jitter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103647615B (en) | 2016-05-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10673565B2 (en) | Confirming data accuracy in a distributed control system | |
| EP2976866B1 (en) | Timestamp correction in a multi-lane communication link with skew | |
| US6741952B2 (en) | Instrument timing using synchronized clocks | |
| CN103929293B (en) | Asymmetrically-delayed time synchronization method and system | |
| CN104115432A (en) | Method and apparatus for communicating time information between time-aware devices | |
| CN103427935B (en) | A kind of network delay measuring method eliminating site error and system | |
| CN112865901B (en) | High-speed data packet acquisition system and method based on FPGA nanosecond timestamp | |
| US11349587B2 (en) | Generating a timestamp | |
| CN103647615A (en) | Method and apparatus for delay jitter elimination during message transmission process | |
| CN104144088A (en) | Network delay measuring method with delay measuring accuracy improved | |
| CN103716147A (en) | Sampling value transmission and synchronization method with path delay measurement function | |
| US10686581B2 (en) | Methods, systems, and computer readable media for transmit timestamp autocalibration | |
| US11424902B2 (en) | System and method for synchronizing nodes in a network device | |
| US9031055B2 (en) | Method and system for recording, synchronizing and analysing data by means of analysis devices which are spatially distributed in a communication network | |
| EP2599247B1 (en) | Method and device for processing data on a connection between two nodes of a communication network | |
| US10735219B2 (en) | System and method for packet transmission in a communications network | |
| EP2341650B1 (en) | Transfer of a synchronization message through a packet radio network | |
| CN109995604B (en) | Flexible Ethernet time delay measurement method and related equipment | |
| CN110943795A (en) | Time synchronization method suitable for bus communication system | |
| CN103227708B (en) | Transmission method and the device of the clock synchronous message in a kind of E1 link | |
| EP2627040B1 (en) | Method for eliminating systematical error components in a set of one-way delay measurement results for communications between two or more computing systems in a communication network, apparatus for performing the method and computer program product | |
| CN106161121A (en) | The measuring method of a kind of message Forwarding Delay, Apparatus and system | |
| CN109257243B (en) | Method and device for determining round trip delay and computer readable storage medium | |
| CN111357243A (en) | User device of bus system, operation method and bus system | |
| CN102571252B (en) | Timing method of high-precision NTP (Network Time Protocol) timing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |