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Method and system for serving slave clocks by master clock

A master clock, clock technology, applied in the field of communication, can solve problems such as no solutions, and achieve the effect of increasing the number

Inactive Publication Date: 2013-01-02
NANJING ZHONGXING XIN SOFTWARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the above-mentioned problems in related technologies, no effective solution has been proposed yet

Method used

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  • Method and system for serving slave clocks by master clock
  • Method and system for serving slave clocks by master clock
  • Method and system for serving slave clocks by master clock

Examples

Experimental program
Comparison scheme
Effect test

example 2

[0049] This example uses the synchronization process of the master clock and a slave clock it serves as an example to illustrate. In fact, the master clock can perform the relevant process of this example simultaneously with any slave clock it serves to increase the number of slave clocks it serves. The specific implementation scheme of this example is as follows:

[0050] Step 1, the master clock sets the service slave clock number threshold to Nmax according to its own processing capability.

[0051] Step 2: The slave clock initiates a unicast Sync negotiation message to the master clock, specifying a sending frequency.

[0052] Step 3. After receiving the message, the master clock judges whether there are Nmax number of slave clocks N, and if so, then sends a Grant message to reject the unicast to the slave clock, otherwise the master clock records the information of the slave clock to the slave clock list, and update the number N of current service slave clocks to N+1.

...

example 3

[0111] image 3 A schematic flowchart of a method for serving a slave clock for a master clock when joining IDLE according to Example 3 of the present invention. Such as image 3 As shown, the method includes:

[0112] Step S302, the master clock sends a notification message to the slave clock;

[0113] Step S304, the master clock sends a synchronization message and a follow-up message to the slave clock;

[0114] Step S306, the slave clock receives notification messages sent by multiple master clocks, selects a master clock, and receives the synchronization message and follow-up message of the master clock; after the slave clock receives the synchronization message, it immediately sends a delay measurement message;

[0115] Step S308, after the master clock receives the delay measurement message, it immediately sends a delay response message;

[0116] Step S310, the slave clock sends NOTIFY-SYNC-STATUS to the master clock after determining that the synchronization perform...

example 4

[0125] Figure 4a It is a schematic diagram of the processing flow of the master clock according to Example 4 of the present invention. Such as Figure 4a As shown, the processing flow includes:

[0126] Step S402, preset the maximum number of service slave clocks Nmax, reserve the number of access slave clocks Nres, and the synchronization holding time Lsync;

[0127] Step S404, after receiving the slave clock unicast negotiation message, check whether the number N of the current serving slave clocks is less than Nmax; if yes, go to step S406, otherwise, go to step S410;

[0128] Step S406, after receiving the slave clock unicast negotiation message, check the number N of slave clocks currently serving, if it is less than Nmax, update N=N+1;

[0129] Step S408, send Announce, Sync, FollowUp to the above slave clock, and respond to Delay-Req, that is, send Delay-resp;

[0130] Step S410, the master clock judges whether there is SyncHoldTime>Lsync in its list of slave clock...

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Abstract

The invention discloses a method and a system for serving slave clocks by a master clock, wherein the method comprises the following steps that: when the master clock receives a notify synchronous status message from the slave clock, the master clock determines that the number of slave clocks currently served by the main clock is up to the threshold value of the number of preset slave clocks; the master clock sends out an IDLE request message to the slave clocks, wherein the IDLE request message is used for indicating that a slave clock unit enters an IDLE state, the IDLE state means that the slave clock and the master clock do not carry out synchronous message interaction and the synchronous property status is maintained by using historical synchronous information before entering the IDLE state; and the master clock determines that a new slave clock is accessed when a received response message from the slave clock corresponding to the IDLE request message satisfies preset conditions. The technical scheme provided by the invention is adopted so that the effect of increasing the numbers of the slave clocks served by the master clock is achieved under the condition of not influencing the synchronous property of the slave clocks.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a method and system for a master clock serving a slave clock. Background technique [0002] The standard IEEE1588V2 provides a mechanism for two devices to achieve synchronization by exchanging messages, which involves a master clock and a slave clock, and the slave clock needs to be synchronized to the master clock. This synchronization process is specifically divided into two steps, the first step: the slave clock and the master clock carry out the negotiation of the synchronization message sending frequency and the sending time, the second step: the master clock sends a synchronization message (Sync) to the slave clock, and the follow-up message ( FollowUp), where FollowUp carries the time when Sync is sent, records the receiving time after receiving Sync from the clock, and sends a delay measurement request message (Delay-Req) to the master clock, records the sending tim...

Claims

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Application Information

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IPC IPC(8): H04J3/06
Inventor 曹海萍孟永胜
Owner NANJING ZHONGXING XIN SOFTWARE CO LTD
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