CN106793054B - Method for determining time delay adjustment value of digital repeater of ring network - Google Patents
Method for determining time delay adjustment value of digital repeater of ring network Download PDFInfo
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- CN106793054B CN106793054B CN201611035303.2A CN201611035303A CN106793054B CN 106793054 B CN106793054 B CN 106793054B CN 201611035303 A CN201611035303 A CN 201611035303A CN 106793054 B CN106793054 B CN 106793054B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
- H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
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Abstract
The invention relates to a method for determining a time delay adjustment value of a digital repeater of an annular network, which comprises the following steps: s1, connecting the near-end machine of the digital repeater with a plurality of remote machines to form a ring-shaped network; s2, measuring the round-trip time delay of the forward direction and the round-trip time delay of the reverse direction between the near-end machine and each far-end machine; s3, selecting the signal transmission direction corresponding to the smaller of the forward direction round-trip delay and the reverse direction round-trip delay as the signal transmission direction, half of the maximum round-trip delay value is the delay value in the networking mode, and the difference between the delay value of the remote end machine of each repeater and the maximum delay value is the delay adjustment value of each remote end machine.
Description
Technical Field
The invention relates to the field of communication, in particular to a method for determining a time delay adjustment value of a digital repeater of an annular network.
Background
Because the time delay between a near-end machine and a far-end machine of the digital repeater can be increased by the long-distance transmission of the optical cable and the introduction of the digital signal processing module of the GSM-R optical fiber digital repeater, multipath interference is easily caused when signals of the multi-digital repeater are overlapped, and the communication quality of a GSM-R system is influenced. The existing digital optical fiber repeater time delay test method generally adopts a one-to-one measurement mode or a multi-stage cascade optical fiber link time delay superposition mode to calculate time delay, is suitable for the condition of a single remote terminal or cascade networking, and has no report of a repeater time delay adjustment mode under the annular networking. The existing manufacturers mostly adopt a manual adjustment or fixed time delay adjustment mode, and the report of declaring automatic adjustment is not available.
Disclosure of Invention
In view of the above, it is desirable to provide a method for determining a delay adjustment value of a digital repeater in a ring network, and the method selects the shortest delay and the corresponding signal transmission direction.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for determining a time delay adjustment value of a digital repeater of an annular networking comprises the following steps:
s1, connecting the near-end machine of the digital repeater with a plurality of remote machines to form a ring-shaped network;
s2, measuring the round-trip time delay of the forward direction and the round-trip time delay of the reverse direction between the near-end machine and each far-end machine;
s3, selecting the signal transmission direction corresponding to the smaller of the forward direction round-trip delay and the reverse direction round-trip delay as the signal transmission direction, half of the maximum round-trip delay value is the delay value in the networking mode, and the difference between the delay value of the remote end machine of each repeater and the maximum delay value is the delay adjustment value of each remote end machine.
Preferably, in step S1, the digital repeater near-end unit and several far-end units are connected by optical fiber to perform ring networking.
Preferably, in step S2, the measuring the forward direction round trip delay includes: and blocking and disconnecting one optical interface of the ring network, sending a measurement packet sequence loop back through the near-end machine to measure the round-trip time delay between the near-end machine and one of the far-end machines, and sequentially measuring the round-trip time delay between the near-end machine and the other far-end machines in a relay transmission mode to obtain the round-trip time delay in the positive direction between the near-end machine and each far-end machine.
Preferably, in step S2, the measuring the reverse direction round trip delay specifically includes: and recovering the optical interface which is blocked and disconnected, blocking and disconnecting the other optical interface, transmitting a measurement packet sequence in the reverse direction, and measuring the reverse-direction transmission round-trip time delay of the near-end machine and each far-end machine.
Preferably, the optical interface is blocked to allow signal transmission in only one direction after disconnection.
Preferably, the measuring the forward direction round trip delay specifically includes: blocking and disconnecting one optical interface of the ring network, simultaneously starting a timer after the near-end machine sends a measurement packet sequence, immediately returning the measurement packet sequence to the near-end machine after the first remote unit RU1 receives the measurement packet sequence, marking the measurement packet sequence with X1, and recording the value TX1 of the timer after the near-end machine receives the measurement packet sequence containing the mark; the near-end machine continues to send the data to a second far-end machine RU2, the second far-end machine RU2 returns the measurement packet sequence to the near-end machine immediately after receiving the measurement packet sequence, and marks X2 on the measurement packet sequence at the same time, after the near-end machine receives the measurement packet sequence containing the marks, the value TX2 of the timer is recorded, the test packet sequence is continuously sent to a third far-end machine RU3, and the like, TX3 and TX4 … TXN are obtained, wherein N is the number of the far-end machines.
Preferably, the measuring the round trip delay in the return direction specifically includes: and recovering the optical interface which is blocked and disconnected, blocking and disconnecting the other optical interface, and transmitting a measuring packet sequence from the Nth remote terminal RUN according to the reverse order so as to measure the round-trip time delay TYN, TY (N-1) … TY1 of the near-end terminal and each remote terminal in the reverse direction. A
Preferably, in the step S3, the smaller of (TX1+ TX2+ … + TXN) and (TY1+ TY2+ … + TYN) is selected as the signal transmission direction, half of the delay value is respectively denoted as T1 and T2 … TN, the maximum delay value is Tmax, and the time values of the RU1 to the RUN repeater, which need to intentionally adjust the delayed transmission, are Tmax-T1, Tmax-T2 and Tmax-T3 … 0 in sequence.
Compared with the prior art, the invention has the beneficial effects that: the invention connects the near-end machine of the digital repeater with a plurality of remote machines to form an annular network, and measures the round-trip time delay of the forward direction and the round-trip time delay of the reverse direction between the near-end machine and each remote machine; selecting the signal transmission direction corresponding to the smaller of the forward direction round trip delay and the reverse direction round trip delay as the signal transmission direction, wherein half of the maximum round trip delay value is the delay value in the networking mode, and the difference between the delay value of the remote end machine of each repeater and the maximum delay value is the delay adjustment value of each remote end machine. And a proper logic and mode is selected for measurement, so that the maximum time delay is ensured to be minimum. Moreover, by adopting the time delay adjustment value determining mode provided by the invention, the shortest time delay adjustment value can be selected, and the overall signal transmission time delay is reduced, so that the coverage distance is improved, and the interference among the digital repeaters is reduced.
Drawings
FIG. 1 is a flow chart of a method of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a ring network according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the lower port lockout disconnect in an embodiment of the present invention;
FIG. 4 is a schematic diagram of upper port blocking and disconnecting according to an embodiment of the present invention.
Detailed Description
The following describes a method for determining a delay adjustment value of a digital repeater in a ring network according to the present invention with reference to the accompanying drawings and embodiments.
The following is a preferred example of the method for determining the delay adjustment value of the digital repeater in the ring network according to the present invention, and the scope of the present invention is not limited thereby.
Fig. 1 shows a method for determining a delay adjustment value of a digital repeater in a ring network, which comprises the following steps:
s1, connecting the near-end machine of the digital repeater with a plurality of remote machines to form a ring-shaped network;
s2, measuring the round-trip time delay of the forward direction and the round-trip time delay of the reverse direction between the near-end machine and each far-end machine;
s3, selecting the signal transmission direction corresponding to the smaller of the forward direction round-trip delay and the reverse direction round-trip delay as the signal transmission direction, half of the maximum round-trip delay value is the delay value in the networking mode, and the difference between the delay value of the remote end machine of each repeater and the maximum delay value is the delay adjustment value of each remote end machine.
Preferably, in step S1, the digital repeater near-end unit and several far-end units are connected by optical fiber to perform ring networking.
Preferably, in step S2, the measuring the forward direction round trip delay includes: and blocking and disconnecting one optical interface of the ring network, sending a measurement packet sequence loop back through the near-end machine to measure the round-trip time delay between the near-end machine and one of the far-end machines, and sequentially measuring the round-trip time delay between the near-end machine and the other far-end machines in a relay transmission mode to obtain the round-trip time delay in the positive direction between the near-end machine and each far-end machine.
Preferably, in step S2, the measuring the reverse direction round trip delay specifically includes: and recovering the optical interface which is blocked and disconnected, blocking and disconnecting the other optical interface, transmitting a measurement packet sequence in the reverse direction, and measuring the reverse-direction transmission round-trip time delay of the near-end machine and each far-end machine.
Preferably, the optical interface is blocked to allow signal transmission in only one direction after disconnection.
As shown in fig. 2, in the present embodiment, the MU in the figure represents a near-end device, the far-end device includes 5 RU1, RU2, RU3, RU4, and RU5, and the measuring of the forward direction round trip delay specifically includes: an optical interface (such as a lower port) of the ring network is blocked and disconnected, as shown in fig. 3, after the near-end machine sends a measurement packet sequence, a timer is started, and after the RU1 receives the measurement packet sequence, on one hand, a test packet is immediately returned to the near-end machine and contains an "X1" flag, and after the near-end machine receives the test packet containing the "X1" flag, the value of the timer is recorded as TX 1; on the other hand, test data continues down to RU 2. After the RU2 receives the test packet, on one hand, immediately returning the test packet to the RU1, where the test packet includes an "X2" flag, and after the RU1 receives the test packet including the "X2" flag, immediately forwarding the test packet including the "X2" flag to the near-end unit, and after the near-end unit receives the test packet, recording the value of the timer as TX 2; on the other hand, test data continues down to RU3, and so on, resulting in TX3, TX4, and TX5, respectively.
Preferably, the measuring the round trip delay in the return direction specifically includes: the optical interface which is blocked and disconnected is recovered, another optical interface (upper port) is blocked and disconnected, as shown in fig. 4, in reverse order, the RU5 starts to send a measuring packet sequence from the 5 th remote unit, and the near-end unit sends a delay test packet message to the RU5, and simultaneously starts a timer. Upon receiving the data, RU5, on one hand, immediately returns a test packet to the near-end, where the test packet includes a "Y5" flag, and the near-end receives the test packet including a "Y5" flag, records the value of the timer as TY 5; on the other hand, test data continues down to RU 4. After the RU4 receives the test packet, on one hand, the RU5 returns the test packet immediately, which contains the "Y4" flag, and after the RU5 receives the test packet containing the "Y4" flag, the RU5 immediately forwards the test packet containing the "Y4" flag to the near-end machine, and after the near-end machine receives the test packet, the value of the timer is recorded as TY 4; on the other hand, the test data is sent down to RU3, and so on, yielding TY3, TY2, and TY1, respectively.
Preferably, in the step S3, the smaller of (TX1+ TX2+ … + TXN) and (TY1+ TY2+ … + TYN) is selected as the signal transmission direction, half of the delay value is respectively denoted as T1 and T2 … TN, the maximum delay value is Tmax, and the time values of the RU1 to the RUN repeater, which need to intentionally adjust the delayed transmission, are Tmax-T1, Tmax-T2 and Tmax-T3 … in sequence. Assuming that T5 is the maximum delay value, the time values (i.e. delay adjustment values) required by the RU 1-RU 5 repeater to intentionally adjust the delayed transmission are sequentially T5-T1, T5-T2, T5-T3, T5-T4 and 0.
Compared with the prior art, the invention has the beneficial effects that: the invention connects the near-end machine of the digital repeater with a plurality of remote machines to form an annular network, and measures the round-trip time delay of the forward direction and the round-trip time delay of the reverse direction between the near-end machine and each remote machine; selecting the signal transmission direction corresponding to the smaller of the forward direction round trip delay and the reverse direction round trip delay as the signal transmission direction, wherein half of the maximum round trip delay value is the delay value in the networking mode, and the difference between the delay value of the remote end machine of each repeater and the maximum delay value is the delay adjustment value of each remote end machine. And a proper logic and mode is selected for measurement, so that the maximum time delay is ensured to be minimum. Moreover, by adopting the time delay adjustment value determining mode provided by the invention, the shortest time delay adjustment value can be selected, and the overall signal transmission time delay is reduced, so that the coverage distance is improved, and the interference among the digital repeaters is reduced.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A method for determining a time delay adjustment value of a digital repeater of an annular networking is characterized by comprising the following steps:
s1, connecting the near-end machine of the digital repeater with a plurality of remote machines to form a ring-shaped network;
s2, measuring the round-trip time delay of the forward direction and the round-trip time delay of the reverse direction between the near-end machine and each far-end machine;
in step S2, the measuring the forward direction round trip delay includes: blocking and disconnecting one optical interface of the ring network, sending a measurement packet sequence loop back through the near-end machine to measure the round-trip time delay between the near-end machine and one of the far-end machines, and sequentially measuring the round-trip time delay between the near-end machine and the other far-end machines in a relay transmission mode to obtain the forward round-trip time delay between the near-end machine and each far-end machine;
the measuring of the forward direction round trip delay specifically comprises: blocking and disconnecting one optical interface of the ring network, simultaneously starting a timer after the near-end machine sends a measurement packet sequence, immediately returning the measurement packet sequence to the near-end machine after the first remote unit RU1 receives the measurement packet sequence, marking the measurement packet sequence with X1, and recording the value TX1 of the timer after the near-end machine receives the measurement packet sequence containing the mark; the near-end machine continues to send the data to a second far-end machine RU2, the second far-end machine RU2 returns the measurement packet sequence to the near-end machine immediately after receiving the measurement packet sequence, and marks X2 on the measurement packet sequence at the same time, after the near-end machine receives the measurement packet sequence containing the marks, the numerical value TX2 of a timer is recorded, the test packet sequence is continuously sent to a third far-end machine RU3, and the rest is done in the same way, so that TX3 and TX4 … TXN are obtained, wherein N is the number of the far-end machines;
s3, selecting the signal transmission direction corresponding to the smaller of the forward direction round-trip delay and the reverse direction round-trip delay as the signal transmission direction, half of the maximum round-trip delay value is the delay value in the networking mode, and the difference between the delay value of the remote end machine of each repeater and the maximum delay value is the delay adjustment value of each remote end machine.
2. The method for determining the delay adjustment value of a digital repeater in a ring network according to claim 1, wherein in step S1, the digital repeater near-end unit and a plurality of remote units are connected by an optical fiber for ring network.
3. The method for determining the delay adjustment value of the digital repeater of the ring network as claimed in claim 1, wherein in the step S2, the measuring the round trip delay in the reverse direction specifically includes: and recovering the optical interface which is blocked and disconnected, blocking and disconnecting the other optical interface, transmitting a measurement packet sequence in the reverse direction, and measuring the reverse-direction transmission round-trip time delay of the near-end machine and each far-end machine.
4. The method for determining the delay adjustment value of a digital repeater in a ring network as claimed in claim 3, wherein the optical interface is blocked and disconnected, and then only one direction of signal transmission is allowed.
5. The method for determining the delay adjustment value of the digital repeater of the ring network as claimed in claim 1, wherein measuring the round trip delay in the return direction specifically comprises: and recovering the optical interface which is blocked and disconnected, blocking and disconnecting the other optical interface, and transmitting a measuring packet sequence from the Nth remote terminal RUN according to the reverse order so as to measure the round-trip time delay TYN, TY (N-1) … TY1 of the near-end terminal and each remote terminal in the reverse direction.
6. The method for determining delay adjustment value of digital repeater of ring network as claimed in claim 5, wherein in said step S3, the smaller delay of (TX1+ TX2+ … + TXN) and (TY1+ TY2+ … + TYN) is selected as the signal transmission direction, half of the delay value is respectively denoted as T1 and T2 … TN, the maximum delay value is Tmax, and the time values of the RU1 to RUN repeater which need to intentionally adjust the delayed transmission are Tmax-T1, Tmax-T2 and Tmax-T3 … 0 in sequence.
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| CN101389090A (en) * | 2008-10-09 | 2009-03-18 | 深圳国人通信有限公司 | Optical fiber repeater, time delay measurement method, device thereof, and compensation method, system |
| CN102497234A (en) * | 2011-12-07 | 2012-06-13 | 深圳市零一通信技术有限公司 | Method for self-adaptive networking in digital optical fiber repeater |
| CN103684569A (en) * | 2012-09-05 | 2014-03-26 | 京信通信系统（中国）有限公司 | Special repeater compatible device and repeater |
| CN105188160A (en) * | 2015-09-25 | 2015-12-23 | 南京泰通科技股份有限公司 | GSM-R special distributed base station for railways |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8116254B2 (en) * | 2008-01-31 | 2012-02-14 | Powerwave Technologies, Inc. | Wireless repeater with smart uplink |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101389090A (en) * | 2008-10-09 | 2009-03-18 | 深圳国人通信有限公司 | Optical fiber repeater, time delay measurement method, device thereof, and compensation method, system |
| CN102497234A (en) * | 2011-12-07 | 2012-06-13 | 深圳市零一通信技术有限公司 | Method for self-adaptive networking in digital optical fiber repeater |
| CN103684569A (en) * | 2012-09-05 | 2014-03-26 | 京信通信系统（中国）有限公司 | Special repeater compatible device and repeater |
| CN105188160A (en) * | 2015-09-25 | 2015-12-23 | 南京泰通科技股份有限公司 | GSM-R special distributed base station for railways |
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