CN101183925A - Method and apparatus for maintaining network clock synchronization - Google Patents
Method and apparatus for maintaining network clock synchronization Download PDFInfo
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- CN101183925A CN101183925A CNA2007101795646A CN200710179564A CN101183925A CN 101183925 A CN101183925 A CN 101183925A CN A2007101795646 A CNA2007101795646 A CN A2007101795646A CN 200710179564 A CN200710179564 A CN 200710179564A CN 101183925 A CN101183925 A CN 101183925A
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- period index
- frame number
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Abstract
The invention provides a method and a device to keep the synchronization of network clocks, belonging to the field of network communication. The method comprises following steps: a packet which carries indication signals of frame cycles and frame numbers sent by a synchronous transmission device of network clocks is received; the indication signals of frame cycles and frame numbers are extracted from the packet; network clock information is restored through processing the clock signals of synchronous frequency, the indication signals of frame cycles and the frame numbers. In addition, the invention provides a synchronous network clock reception device and a synchronous network clock transmission device. Besides maintaining the synchronization of network clocks, the invention has advantages of high anti-interference capability and long transmission distance, which meets the requirement of high-speed network clocks.
Description
Technical field
The present invention relates to network communication field, relate in particular to a kind of synchronous method of network clocking and device of keeping.
Background technology
In communication system, clock synchronization is to guarantee that voice-and-data connects a key design factor of reliable and zero defect.
And clock synchronization is a Frequency Synchronization, is meant to keep certain strict particular kind of relationship on frequency between the signal or the phase place, and occurs with same Mean Speed its corresponding significant instant, moves with identical speed to keep equipment all in the cordless communication network.In wireless communication system, the clock that network clocking between Base Band Unit REC (RadioEquipment Controller) and radio frequency unit RE (Radio Equipment) need be transmitted synchronously comprises the clock signal of Frequency Synchronization, and frame period index signal FCLK (Frameclock) and frame number FN (Frame Number).
Prior art provides a kind of synchronous method of network clocking that keeps, and this method keeps the synchronous of network clocking by the clock distribution between REC, RE.
In realizing process of the present invention, the inventor finds method described in the prior art, and there are the following problems:
Because the clock distribution all is by the analog signal transmission clock sync signal, make this method under the situation that keeps clock synchronization, poor anti jamming capability, transmitting range is short, can't satisfy the requirement of express network clock.
Summary of the invention
In view of above-mentioned existing in prior technology problem, embodiment of the present invention provides a kind of synchronous method of network clocking and device of keeping, and utilizes described method and apparatus when keeping clock synchronization, and antijamming capability is strong, transmitting range is long, satisfies the requirement of express network clock.
The specific embodiment of the present invention provides a kind of synchronous method of network clocking that keeps, and described method comprises:
Reception is extracted described frame period index signal and described frame number from the packet that has frame period index signal and frame number of network clocking synchronized transmission device from described packet;
The clock signal of Frequency Synchronization, described frame period index signal and described frame number are handled, recovered network clocking information.
The specific embodiment of the invention also provides a kind of network clocking synchronous receiving system, and described device comprises:
Receiver module is used to receive the packet that has frame period index signal and frame number from network clocking synchronized transmission device;
Extraction module is used for extracting described frame period index signal and described frame number from described packet;
The recovered clock module is used for the clock signal of Frequency Synchronization, described frame period index signal and described frame number are handled, and recovers network clocking information.
The specific embodiment of the present invention also provides a kind of network clocking synchronized transmission device, and described device comprises:
The unit is set: be used for frame period index signal and frame number are arranged in the packet;
Transmitting element: be used to send described packet.
By the above-mentioned technical scheme that provides as can be seen, the technical scheme of the embodiment of the invention is at the packet that has frame period index signal and frame number that receives from network clocking synchronized transmission device, the clock information that the clock signal of Frequency Synchronization and the frame period index signal of extracting from packet and frame number are handled the system of obtaining, because it carries out the transmission of frame period index signal and frame number by the form of packet, so this method antijamming capability is strong, transmitting range is long, satisfies the requirement of express network clock.
Description of drawings
Fig. 1 is the flow chart of the described method of the specific embodiment of the invention.
Fig. 2 is the flow chart of the embodiment of the invention 1 described method.
Fig. 3 is the structure chart of the synchronous receiving system of the described network clocking of the specific embodiment of the invention.
Fig. 4 is the structure chart of the described network clocking synchronized transmission of specific embodiment of the invention device.
Embodiment
Embodiment of the present invention provides a kind of synchronous method of network clocking that keeps.
This method comprises as shown in Figure 1:
Said method can be finished by RE, and the clock information of this Frequency Synchronization can be obtained from Ethernet by the physical layer among the RE.Above-mentioned packet can be media access control layer MAC bag (Medium AccessControl).Network clocking synchronized transmission device in the said method can be REC.
Said method can also comprise that network clocking synchronized transmission device is that REC is written into the MAC bag with FCLK in the system clock and FN, and the MAC bag is provided with priority; Its implementation can for, FCLK and FN are arranged in the Payload payload field of MAC bag, then this MAC bag is provided with priority.Concrete structure about the MAC bag can be referring to the description among the IEEE 802.3; The above-mentioned priority that is provided with preferentially selects to be set to limit priority, also can be arranged to other priority certainly or the MAC bag is not provided with priority in actual conditions.
In the said method clock signal of Frequency Synchronization, described frame period index signal and described frame number are handled, recover network clocking information concrete operations can for, after the clock signal of Frequency Synchronization, described frame period index signal and described frame number carried out the phase demodulation Filtering Processing, recover network clocking information, it can be realized by following method, clock signal, FCLK and the FN of Frequency Synchronization are carried out the phase demodulation Filtering Processing by the mode of logical course or software, make clock signal, FCLK and the FN of Frequency Synchronization eliminate the influence that the transmission shake brings.Certainly can clock signal, FCLK and the FN of Frequency Synchronization be reverted to network clocking information by other processing mode in actual conditions, the specific embodiment of the present invention does not limit concrete processing mode yet.
Reception in the said method can receive this packet by interfaces such as Fast Ethernet FE (Fast Ethernet) electrical interface, gigabit Ethernet GE (Gigabit Ethernet) electrical interface, FE optical interface or GE optical interfaces from the packet that has frame period index signal and frame number of network clocking synchronized transmission device.The specific embodiment of the invention is not limited to the concrete form of interface.
For better describing the described method of embodiment of the present invention, existing 2 pairs of the specific embodiment of the present invention in conjunction with the accompanying drawings describe:
Embodiment 1: a kind of synchronous method of network clocking that keeps that the specific embodiment of the present invention provides, the technology scene of present embodiment is, the operating main body of present embodiment is RE, network clocking synchronized transmission device is REC, REC is arranged on FCLK and FN the Payload payload field of MAC bag, and this MAC bag is provided with limit priority sends, receive the MAC bag that has frame period index signal and frame number by the FE electrical interface.Present embodiment comprises following operation:
The FE electrical interface also can be replaced with other interface such as GE electrical interface, FE optical interface or GE optical interface in this step.
RE in this step obtains the clock signal explanation in above-mentioned of Frequency Synchronization, is not just giving unnecessary details here.
The method that embodiment of the present invention provides receives the packet that has frame period index signal and frame number from network clocking synchronized transmission device, the clock information that the clock signal of Frequency Synchronization and the frame period index signal of extracting from packet and frame number are handled the system of obtaining, because it carries out the transmission of frame period index signal and frame number by the form of packet, so this method antijamming capability is strong, transmitting range is long, satisfies the requirement of express network clock.
Embodiments of the present invention also provide a kind of network clocking synchronous receiving system, and as shown in Figure 3, this device comprises receiver module 31: be used to receive the packet that has frame period index signal and frame number from network clocking synchronized transmission device; Extraction module 32: be used for extracting described frame period index signal and described frame number from described packet; Recovered clock module 33: be used for the clock signal of Frequency Synchronization, described frame period index signal and described frame number are handled, recover network clocking information.The synchronous receiving system of above-mentioned network clocking can be RE.The concrete operations from the packet that has frame period index signal and frame number of network clocking synchronized transmission device in the said apparatus illustrate in the inventive method embodiment, are not just giving unnecessary details here.
Above-mentioned recovered clock module 33 can comprise: processing sub 331: be used for the clock signal of Frequency Synchronization, described frame period index signal and described frame number are carried out the phase demodulation Filtering Processing; Recover submodule 332, be used for after processing sub 331 is finished the phase demodulation Filtering Processing, recovering network clocking information.
Above-mentioned receiver module 31 comprises one or more in the following module:
Fast Ethernet electricity electrical interface submodule 311: be used for by the packet that has frame period index signal and frame number of FE electrical interface reception from network clocking synchronized transmission device;
Fast Ethernet electro optical interface submodule 312 is used for by the packet that have frame period index signal and frame number of FE optical interface reception from network clocking synchronized transmission device;
Gigabit Ethernet electrical interface submodule 313 is used for by the packet that have frame period index signal and frame number of GE electrical interface reception from network clocking synchronized transmission device;
Gigabit Ethernet optical interface submodule 314 is used for by the packet that have frame period index signal and frame number of GE optical interface reception from network clocking synchronized transmission device.
The synchronous receiving system of the described network clocking of the specific embodiment of the invention, reception is from the packet that has frame period index signal and frame number of network clocking synchronized transmission device, the clock information that the clock signal of Frequency Synchronization and the frame period index signal of extracting from packet and frame number are handled the system of obtaining.Because this device carries out the transmission of frame period index signal and frame number with the form of packet, so this device antijamming capability is strong, transmitting range is long, satisfies the requirement of express network clock.
The specific embodiment of the invention also provides a kind of network clocking synchronized transmission device, and as shown in Figure 4, described device comprises: unit 41 is set: be used for frame period index signal and frame number are arranged in the packet; Transmitting element 42: be used to send described packet.
Said apparatus can also comprise priority unit 43: be used for described unit 41 is set packet is set after, described packet is provided with priority.
The described network clocking synchronized transmission of specific embodiment of the invention device is arranged on frame period index signal and frame number in the packet, and this packet is sent, and makes frame period index signal and frame number transmit by the form of packet.Because this device is the form Data transmission by packet, so this device antijamming capability is strong, transmitting range is long, satisfies the requirement of express network clock.
In sum, the technical scheme that the specific embodiment of the invention provides has under the situation that keeps clock synchronization, and antijamming capability is strong, and transmitting range is long, satisfies the advantage of express network clock.
The above; only be the preferable embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the embodiment of the invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (9)
1. one kind keeps the synchronous method of network clocking, it is characterized in that described method comprises:
Reception is from the packet that has frame period index signal and frame number of network clocking synchronized transmission device;
From described packet, extract described frame period index signal and described frame number;
The clock signal of Frequency Synchronization, described frame period index signal and described frame number are handled, recovered network clocking information.
2. method according to claim 1 is characterized in that, and is further comprising the steps of:
Network clocking synchronized transmission device is arranged on frame period index signal and frame number in the packet, and described packet is provided with priority.
3. method according to claim 1 is characterized in that, described clock signal with Frequency Synchronization, described frame period index signal and described frame number are handled, and are specially:
The clock signal of Frequency Synchronization, described frame period index signal and described frame number are carried out the phase demodulation Filtering Processing.
4. method according to claim 1 is characterized in that, described reception is specially from the packet that has frame period index signal and frame number of network clocking synchronized transmission device:
By Fast Ethernet electrical interface, gigabit Ethernet electrical interface, Fast Ethernet optical interface or the reception of gigabit Ethernet optical interface the packet that has frame period index signal and frame number from network clocking synchronized transmission device.
5. synchronous receiving system of network clocking is characterized in that described device comprises:
Receiver module is used to receive the packet that has frame period index signal and frame number from network clocking synchronized transmission device;
Extraction module is used for extracting described frame period index signal and described frame number from described packet;
The recovered clock module is used for the clock signal of Frequency Synchronization, described frame period index signal and described frame number are handled, and recovers network clocking information.
6. device according to claim 5 is characterized in that, described recovered clock module comprises:
Processing sub is used for the clock signal of Frequency Synchronization, described frame period index signal and described frame number are carried out the phase demodulation Filtering Processing;
Recover submodule, be used for after processing sub is finished the phase demodulation Filtering Processing, recovering network clocking information.
7. device according to claim 5 is characterized in that, described receiver module comprises:
Fast Ethernet electrical interface submodule is used for by the packet that have frame period index signal and frame number of Fast Ethernet electrical interface reception from network clocking synchronized transmission device;
Fast Ethernet optical interface submodule is used for by the packet that have frame period index signal and frame number of Fast Ethernet optical interface reception from network clocking synchronized transmission device;
Gigabit Ethernet electrical interface submodule is used for by the packet that have frame period index signal and frame number of gigabit Ethernet electrical interface reception from network clocking synchronized transmission device;
Or gigabit Ethernet optical interface submodule, be used for by the packet that have frame period index signal and frame number of gigabit Ethernet optical interface reception from network clocking synchronized transmission device.
8. network clocking synchronized transmission device is characterized in that described device comprises:
The unit is set, is used for frame period index signal and frame number are arranged in the packet;
Transmitting element is used to send described packet.
9. device according to claim 8 is characterized in that, described device also comprises:
Priority unit, be used for described the unit is set packet is set after, described packet is provided with priority.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101795646A CN101183925A (en) | 2007-12-14 | 2007-12-14 | Method and apparatus for maintaining network clock synchronization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101795646A CN101183925A (en) | 2007-12-14 | 2007-12-14 | Method and apparatus for maintaining network clock synchronization |
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| Publication Number | Publication Date |
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| CN101183925A true CN101183925A (en) | 2008-05-21 |
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| CNA2007101795646A Pending CN101183925A (en) | 2007-12-14 | 2007-12-14 | Method and apparatus for maintaining network clock synchronization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108029083A (en) * | 2015-07-17 | 2018-05-11 | 瑞典爱立信有限公司 | The synchronization of wireless base station |
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- 2007-12-14 CN CNA2007101795646A patent/CN101183925A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108029083A (en) * | 2015-07-17 | 2018-05-11 | 瑞典爱立信有限公司 | The synchronization of wireless base station |
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