CN103580768A

CN103580768A - Time synchronizing method and device

Info

Publication number: CN103580768A
Application number: CN201210282404.5A
Authority: CN
Inventors: 唐刚; 付彬; 宋乃兵; 廖丹
Original assignee: Huawei Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2012-08-09
Filing date: 2012-08-09
Publication date: 2014-02-12
Anticipated expiration: 2032-08-09
Also published as: CN103580768B

Abstract

The embodiment of the invention provides a time synchronizing method and device, and relates to the field of communication. The time synchronizing method and device can solve the problem of difficult synchronization for time zones or daylight saving time. The time synchronizing method comprises the steps that an OLT sends a time synchronizing request to an NTP server according to pre-configured NTP server information to obtain the GMT, after registration and on-line are carried out on an ONU, a message carrying the information of the time zone and the daylight saving time, configured on the OLT in advance, of the location of the OLT and a message carrying the current GMT obtained in a calculating mode according to the GTM sent by the NTP server are sent to the ONU, and therefore the ONU obtains the local time in a calculating mode according to the received information of the time zone and the daylight saving time of the location of the OLT and the current GMT.

Description

A kind of method for synchronizing time and device

Technical field

The present invention relates to the communications field, relate in particular to a kind of method for synchronizing time and device.

Background technology

At FTTH, (its English full name is Fiber To The Home, referred to as Fiber to the home) in networking, based on ONU, (its English full name is Optical Network Unit to user side equipment carrying out, referred to as optical network unit) Voice over IP business time, incoming call time, network time that this user side equipment shows must be synchronous with local zone time, and the local zone time showing on user side equipment can obtain from this ONU.This ONU can obtain local zone time according to GMT (its English full name is Greenwich Mean Time, referred to as Greenwich mean time) and the time zone at ONU place and the calculations of offset of daylight-saving time.

In the prior art, there is a kind of method that can make ONU synchronously obtain local zone time and send to user side equipment: (its English full name is Network Time Protocol at ONU and NTP, referred to as NTP (Network Time Protocol)) passage connects between server, by webmaster BMS, (its English full name is Broadband Management System, referred to as broadband management system) or ITMS (its English full name is Integrated Terminal Management System, referred to as terminal total management system) by ntp server address information, time zone, daylight-saving time information is handed down to ONU, ONU by interface channel to this ntp server transmitting time synchronization request, from this ntp server, obtain the GMT time, then ONU obtains local zone time according to GMT time and the time zone at ONU place and the calculations of offset of daylight-saving time, and while needing the business such as caller identification at user side equipment, the local zone time calculating is handed down to user side equipment.

In above-mentioned two kinds of existing methods, need all to rely on BMS/ITMS and issue time zone, seasonal information of summer, and for same country/area the situation across a plurality of time zones or a plurality of daylight-saving time intervals, typical in the U.S., different time zone, Canadian office, Spain is that subregion different time enters the daylight-saving time, now just need BMS/ITMS to configure separately different time zone or daylight-saving time to each user, increased the synchronous working amount in synchronous time zone or summertime process.

Summary of the invention

Provide a kind of method for synchronizing time and device, to reduce the problem of the synchronous working amount in synchronous time zone or summertime process.

First aspect, a kind of method for synchronizing time is disclosed, be applied to optical line terminal OLT, comprise: according to the upper pre-configured NTP (Network Time Protocol) ntp server information of described OLT, to described ntp server transmitting time synchronization request, so that described ntp server returns to GMT time Greenwich mean time to described OLT; Receive and record the GMT time that described ntp server sends; Described OLT sends to the optical network unit ONU that registration is reached the standard grade on described OLT the message message that carries the on-site time zone of described OLT and daylight-saving time information; The GMT time timing that described OLT sends according to described ntp server obtains the current GMT time, and the described current GMT time is carried in another message message and sends to described ONU, so that the on-site time zone of described OLT that described ONU basis receives and daylight-saving time information and described current GMT Time Calculation obtain the local zone time of ONU.

In the possible implementation of the first, at described OLT, after described ONU transmission carries the message message of the on-site time zone of described OLT and daylight-saving time information, described method further comprises:

Receive the message message that carries the ONU timestamp A1 while leaving ONU that described ONU sends;

OLT timestamp B2 when adding the OLT timestamp B1 of described message message while arriving described OLT and leaving described OLT in the message message of the described A1 of carrying, send to described ONU, so that described ONU is according to described A1, B1 and B2 and described message message arrive the ONU timestamp A2 of described ONU, calculate the time difference between described ONU and described OLT, and according to the on-site time zone of described OLT in the message packet receiving and daylight-saving time information and described time difference and A2, calculate the local zone time of ONU, wherein, the system time that described ONU timestamp A1 and A2 are described ONU, described OLT timestamp B1 and B2 are the GMT time that described OLT obtains according to the GMT time timing of described ntp server transmission.

In conjunction with the first mode in the cards of first aspect or first aspect, in the second mode in the cards, the message message of the use of communicating by letter between described OLT and ONU is OMCI/OAM message.

Second aspect, discloses a kind of method for synchronizing time, is applied to optical network unit ONU, comprising:

Described ONU receives the message message that carries the on-site time zone of described OLT and daylight-saving time information that OLT sends; Described ONU receives the message message that carries the current GMT time that described OLT sends, and the described current GMT time is that the GMT time timing being sent according to ntp server by described OLT obtains; The on-site time zone of described OLT in the described ONU basis message message receiving and daylight-saving time information and described current GMT Time Calculation obtain the local zone time of ONU.

In the possible implementation of the first, after described ONU receives the message message that carries the on-site time zone of described OLT and daylight-saving time information that described OLT sends, described method further comprises:

Described ONU sends the message message that carries the ONU timestamp A1 while leaving ONU to described OLT; The message message of the OLT timestamp B1 that described ONU receives that described OLT returns when carrying A1 and described message message and arriving described OLT and the OLT timestamp B2 while leaving described OLT, and in described message message, add the ONU timestamp A2 that described message message arrives described ONU; Wherein, the system time that described ONU timestamp A1 and A2 are described ONU, described OLT timestamp B1 and B2 are the GMT time that described OLT obtains according to the GMT time timing of described ntp server transmission; Described ONU calculates the time difference t between described ONU and described OLT according to the A1 in message message, B1, B2 and A2, and described t meets following formula: t=((B1-A2)-(A1-B2))/2; The on-site time zone of described OLT in the described ONU basis message packet receiving and daylight-saving time information and described time difference and A2 calculate the local zone time of ONU.

In conjunction with the first mode in the cards of first aspect or first aspect, in the second mode in the cards, the message message of the use of communicating by letter between described ONU and described OLT is OMCI/OAM message.

The third aspect, also discloses a kind of optical line terminal OLT, comprising:

Memory cell, for storing pre-configured NTP (Network Time Protocol) ntp server information;

Generation unit, for according to the ntp server Information generation time synchronized request of described cell stores, and sends to transmitting element by described time synchronized request;

Described transmitting element, for sending described time synchronized request, so that described ntp server returns to GMT time Greenwich mean time to described OLT to described ntp server;

Receiving element, the GMT time sending for receiving described ntp server;

Described memory cell, the GMT time sending for storing the described ntp server of described receiving element reception;

Timing unit, obtains the current GMT time for the GMT time timing sending according to the described ntp server of described cell stores;

Described transmitting element, is further used for sending to the optical network unit ONU that registration is reached the standard grade on described OLT the message message that carries the on-site time zone of described OLT and daylight-saving time information that described generation unit generates;

Described transmitting element, another message message that carries the current GMT time that described timing unit timing obtains that is further used for sending to described ONU that described generation unit generates, so that described ONU obtains the local zone time of ONU according to the on-site time zone of described OLT receiving and daylight-saving time information and described current GMT Time Calculation.

In the possible implementation of the first, described receiving element, is further used for receiving the message message that carries the ONU timestamp A1 while leaving ONU that described ONU sends;

Described generation unit, OLT timestamp B2 when adding the OLT timestamp B1 of described message message while arriving described OLT in the message message of the described A1 of carrying and leaving described OLT, generation carries the message message of A1, B1 and B2, and the message message of the described A1 of carrying, B1 and B2 is sent to described transmitting element;

Described transmitting element, be further used for the message message of the described A1 of carrying, B1 and B2 to send to described ONU, so that described ONU arrives the ONU timestamp A2 of described ONU according to described A1, B1 and B2 and described message message, calculate the time difference between described ONU and described OLT, and according to the on-site time zone of described OLT in the message packet receiving and daylight-saving time information and described time difference and A2, calculate the local zone time of ONU; Wherein, the system time that described ONU timestamp A1 and A2 are described ONU, described OLT timestamp B1 and B2 are the GMT time that described OLT obtains according to the GMT time timing of described ntp server transmission.

In conjunction with the first mode in the cards of the third aspect or the third aspect, in the second mode in the cards, the message message of the use of communicating by letter between described OLT and described ONU is OMCI/OAM message.

Fourth aspect, also discloses a kind of optical network unit ONU, comprising:

Receiving element, the message message that carries the on-site time zone of described OLT and daylight-saving time information sending for receiving OLT;

Described receiving element, is further used for receiving another message message that carries the current GMT time that described OLT sends, and the described current GMT time is that the GMT time timing being sent according to ntp server by described OLT obtains;

Computing unit, the on-site time zone of described OLT of the message message receiving for basis and daylight-saving time information and described current GMT Time Calculation obtain the local zone time of ONU.

In the possible implementation of the first, described ONU further comprises:

Generation unit, for generating the message message that carries the ONU timestamp A1 while leaving ONU, and sends to transmitting element by the message message of the described A of carrying 1;

Described transmitting element, for the message message to carrying A 1 described in described OLT transmission;

Described receiving element, the message message of the OLT timestamp B2 when being further used for receiving the OLT timestamp B1 that described OLT returns when carrying A1 and described message message and arriving described OLT and leaving described OLT;

Described generation unit, be further used for adding the ONU timestamp A2 that described message message arrives described ONU in the message message of the described A1 of carrying, B1 and B2, generation carries the message message of A1, A2, B1 and B2, wherein, the system time that described ONU timestamp A1 and A2 are described ONU, described OLT timestamp B1 and B2 are the GMT time that described OLT obtains according to the GMT time timing of described ntp server transmission;

Described computing unit, A1, B1, B2 and A2 in the message message that is further used for generating according to described generation unit calculate the time difference t between described ONU and described OLT, and described t meets following formula:

t＝((B1-A2)-(A1-B2))/2；

Described computing unit, is further used for calculating according to the on-site time zone of described OLT in the message packet receiving and daylight-saving time information and described time difference and A2 the local zone time of ONU.

In conjunction with the first mode in the cards of fourth aspect or fourth aspect, in the second mode in the cards, the message message of the use of communicating by letter between described ONU and described OLT is OMCI/OAM message.

The 5th aspect, also discloses a kind of optical line terminal OLT, comprising:

Memory, for storing pre-configured NTP (Network Time Protocol) ntp server information;

Processor, for according to the ntp server Information generation time synchronized request of described memory stores, and sends to transmitter by described time synchronized request;

Described transmitter, for sending described time synchronized request, so that described ntp server returns to GMT time Greenwich mean time to described OLT to described ntp server;

Receiver, the GMT time sending for receiving described ntp server;

Described memory, the GMT time sending for storing the described ntp server of described receiving element reception;

Described processor, obtains the current GMT time for the GMT time timing sending according to the described ntp server of described cell stores;

Described transmitter, is further used for sending to the optical network unit ONU that registration is reached the standard grade on described OLT the message message that carries the on-site time zone of described OLT and daylight-saving time information that described processor generates;

Described transmitter, be further used for sending to described ONU another message message that carries the described current GMT time that described processor generates, so that the on-site time zone of described OLT that described ONU basis receives and daylight-saving time information and described current GMT Time Calculation obtain the local zone time of ONU.

In the possible implementation of the first, described receiver, is further used for receiving the message message that carries the ONU timestamp A1 while leaving ONU that described ONU sends;

Described processor, OLT timestamp B2 when adding the OLT timestamp B1 of described message message while arriving described OLT in the message message of the described A1 of carrying and leaving described OLT, generation carries the message message of A1, B1 and B2, and the message message of the described A1 of carrying, B1 and B2 is sent to described transmitting element;

Described transmitter, be further used for the message message of the described A1 of carrying, B1 and B2 to send to described ONU, so that described ONU arrives the ONU timestamp A2 of described ONU according to described A1, B1 and B2 and described message message, calculate the time difference between described ONU and described OLT, and according to the on-site time zone of described OLT in the message packet receiving and daylight-saving time information and described time difference and A2, calculate the local zone time of ONU; Wherein, the system time that described ONU timestamp A1 and A2 are described ONU, described OLT timestamp B1 and B2 are the GMT time that described OLT obtains according to the GMT time timing of described ntp server transmission.

In conjunction with the first mode in the cards of the 5th aspect or the 5th aspect, the message message of the use of communicating by letter between OLT described in the second mode in the cards and described ONU is OMCI/OAM message.

The 6th aspect, also discloses a kind of optical network unit ONU, comprising:

Receiver, the message message that carries the on-site time zone of described OLT and daylight-saving time information sending for receiving OLT;

Described receiver, is further used for receiving another message message that carries the current GMT time that described OLT sends, and the described current GMT time is that the GMT time timing being sent according to ntp server by described OLT obtains;

Processor, the on-site time zone of described OLT of the message message receiving for basis and daylight-saving time information and described current GMT Time Calculation obtain the local zone time of ONU.

In the possible implementation of the first, described ONU further comprises:

Described processor, for generating the message message that carries the ONU timestamp A1 while leaving ONU, and sends to transmitter by the message message of the described A1 of carrying;

Described transmitter, is further used for sending to described OLT the message message that carries the ONU timestamp A1 while leaving ONU;

Described receiver, the message message of the OLT timestamp B2 when being further used for receiving the OLT timestamp B1 that described OLT returns when carrying A1 and described message message and arriving described OLT and leaving described OLT;

Described processor, be further used for adding the ONU timestamp A2 that described message message arrives described ONU in the message message of the described A1 of carrying, B1 and B2, generation carries the message message of A1, A2, B1 and B2, wherein, the system time that described ONU timestamp A1 and A2 are described ONU, described OLT timestamp B1 and B2 are the GMT time that described OLT obtains according to the GMT time timing of described ntp server transmission;

Described processor, is further used for calculating the time difference t between described ONU and described OLT according to A1, B1, B2 and A2 in message message, and described t meets following formula:

t＝((B1-A2)-(A1-B2))/2；

Described processor, is further used for calculating according to the on-site time zone of described OLT in the message packet receiving and daylight-saving time information and described time difference and A2 the local zone time of ONU.

In conjunction with the first mode in the cards of the 5th aspect or the 5th aspect, in the second mode in the cards, the message message of the use of communicating by letter between described ONU and described OLT is OMCI/OAM message.

The method for synchronizing time that technique scheme provides and device, by OLT, to ONU, issue the on-site time zone of described OLT and seasonal information of summer, do not rely on BMS/ITMS and issue time zone and seasonal information of summer, situation for same country/area across a plurality of time zones or a plurality of daylight-saving time intervals, because the ONU under described OLT is in identical time zone and daylight-saving time, do not need each user to configure separately different time zone or daylight-saving time, make the workload of OLT less than the workload of BMS/ITMS in prior art, thereby reduced the workload in synchronous time zone or summertime process.

Accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

A kind of method for synchronizing time schematic flow sheet that Fig. 1 provides for embodiment 1;

The another kind of method for synchronizing time schematic flow sheet that Fig. 2 provides for embodiment 1;

A kind of method for synchronizing time schematic flow sheet that Fig. 3 provides for embodiment 2;

The another kind of method for synchronizing time schematic flow sheet that Fig. 4 provides for embodiment 2;

The schematic diagram of a kind of clock synchronization system that Fig. 5 provides for embodiment 2;

The structured flowchart of a kind of OLT that Fig. 6 provides for embodiment 2;

The structured flowchart of a kind of ONU that Fig. 7 provides for embodiment 2;

The structured flowchart of the another kind of OLT that Fig. 8 provides for embodiment 2;

The structured flowchart of the another kind of ONU that Fig. 9 provides for embodiment 2.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

Embodiment 1

The embodiment of the present invention provides a kind of method for synchronizing time, as shown in Figure 1, while being applied to OLT (its English full name is Optical Line Terminal, referred to as optical line terminal), said method comprising the steps of:

101, according to the upper pre-configured ntp server information of described OLT, to described ntp server transmitting time synchronization request, so that described ntp server returns to the GMT time to described OLT.

OLT when access network, network management personnel can be on described OLT pre-configured ntp server information and the on-site time zone of described OLT and daylight-saving time information.Described OLT, can be according to pre-configured ntp server information to described ntp server transmitting time synchronization request after access network, and described ntp server can return to the GMT time to described OLT after receiving described time synchronized request.Here it should be noted that, described OLT can, immediately to described ntp server transmitting time synchronization request after access network, also can be take the scheduled time as the cycle regularly to described ntp server transmitting time synchronization request by other times.

102, receive and record the GMT time that described ntp server returns.

Described ntp server can immediately return to the GMT time to described OLT after receiving described time synchronized request, because described OLT can be take the scheduled time as the cycle regularly to described ntp server transmitting time synchronization request, therefore described OLT just can periodically receive the GMT time that described ntp server sends, the GMT time that more ntp server returns described in new record simultaneously.

103, described OLT sends to the ONU that registration is reached the standard grade on described OLT the message message that carries the on-site time zone of described OLT and daylight-saving time information.

Described ONU registers while reaching the standard grade on described OLT, and described OLT can send to described ONU the message message that carries the on-site time zone of described OLT and daylight-saving time information at once.The on-site time zone of described OLT and daylight-saving time information have been pre-configured on described OLT.Described message message can be that (its English full name is ONU Management and Control Interface to OMCI, referred to as ONU management and control interface) (its English full name is Operation, Administration & Maintenance for message or OAM, referred to as Operations, Administration and Maintenance) message, the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the on-site time zone of described OLT and daylight-saving time information is as shown in table 1:

Table 1

104, the GMT time timing that described OLT sends according to described ntp server obtains the current GMT time, and the described current GMT time is carried in another message message and sends to described ONU, so that the on-site time zone of described OLT that described ONU basis receives and daylight-saving time information and described current GMT Time Calculation obtain the local zone time of ONU.

Described OLT can constantly update and record the GMT time that described ntp server sends, and the own timing of GMT time sending according to described ntp server obtains the current GMT time, then the described current GMT time is carried at and in message message, sends to described ONU.Described OLT can carry the message message of current GMT time to all ONU broadcast under described OLT in Preset Time timing, also can to described ONU, send the message message that carry the current GMT time separately, at this, does not limit.The described message message that carries the current GMT time can be OMCI/OAM message, and the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the described current GMT time is as shown in table 2:

Table 2

Described ONU is according to the on-site time zone of described OLT and daylight-saving time information and the described current GMT time of carrying in the message packet receiving, pass through formula: local zone time=current GMT time+time zone+daylight-saving time skew, can calculate the local zone time of ONU, ONU can synchronously become the local zone time of described ONU by the current system time of this ONU, when the subscriber equipment under described ONU needs the business such as caller identification like this, described ONU just can by the local zone time of described ONU, by FSK, (its English full name be Frequency-shift keying, referred to as frequency shift keying) etc. mode be handed down to described subscriber equipment, described subscriber equipment just can demonstrate local zone time accurately, for user's work and life offers convenience.

When the method that the embodiment of the present invention provides is applied to ONU, as shown in Figure 2, said method comprising the steps of:

201, described ONU receives the message message that carries the on-site time zone of described OLT and daylight-saving time information that OLT sends, and the on-site time zone of described OLT and daylight-saving time information have been pre-configured on described OLT.

OLT when access network, network management personnel can be on described OLT the on-site time zone of pre-configured described OLT and daylight-saving time information.After described ONU registers and reaches the standard grade on described OLT, described OLT can send to described ONU the message message that carries the on-site time zone of described OLT and daylight-saving time information at once.Described message message can be OMCI/OAM message, and the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the on-site time zone of described OLT and daylight-saving time information is as shown in table 1.Generally, all ONU under an OLT are in the on-site time zone of described OLT and daylight-saving time, so the on-site time zone of described OLT and daylight-saving time information are exactly the on-site time zone of described ONU and daylight-saving time information.

202, described ONU receives another message message that carries the current GMT time that described OLT sends, and the described current GMT time is that the GMT time timing being sent according to ntp server by described OLT obtains.

OLT can be regularly from the described ntp server synchronization gain GMT time, and then own timing obtains the current GMT time.At OLT, to described ONU, send and carry after the message message of the on-site time zone of described OLT and daylight-saving time information, described OLT also can be carried at the described current GMT time in another message message and send to described ONU, described another message message can be also OMCI/OAM message, the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the described current GMT time is as shown in table 2.Described like this ONU just can synchronously obtain the GMT time.

203, the on-site time zone of described OLT in the described ONU basis message message receiving and daylight-saving time information and described current GMT Time Calculation obtain the local zone time of ONU.

By

step

201 and 202, described ONU receives the message message that carries the message message of the on-site time zone of described OLT and daylight-saving time information and carry the described current GMT time, described ONU resolves this message message and obtains the message message of the on-site time zone of described OLT and daylight-saving time information and carry the described current GMT time, pass through formula: local zone time=current GMT time+time zone+daylight-saving time is offset, and just can calculate the local zone time of ONU.ONU can synchronously become the local zone time of described ONU by the current system time of this ONU, when the subscriber equipment under described ONU needs the business such as caller identification like this, described ONU just can by the local zone time of described ONU, by FSK, (its English full name be Frequency-shift keying, referred to as frequency shift keying) etc. mode be handed down to described subscriber equipment, described subscriber equipment just can demonstrate local zone time accurately, for user's work and life offers convenience.

A kind of method for synchronizing time that the embodiment of the present invention provides, by OLT, to ONU, issue the on-site time zone of described OLT and seasonal information of summer, do not rely on BMS/ITMS and issue time zone and seasonal information of summer, situation for same country/area across a plurality of time zones or a plurality of daylight-saving time intervals, because each OLT coverage is little, ONU under each OLT is in identical time zone and daylight-saving time, do not need each user to configure separately different time zone or daylight-saving time, make the workload of OLT less than the workload of BMS/ITMS in prior art, thereby reduced the workload in synchronous time zone or summertime process.On the other hand, due to described OLT can by with ONU between protocol massages message send to ONU under easily described time zone or daylight-saving time information being synchronizeed, in the time of can also overcoming ITMS described in prior art, cannot manage the ONU of bridge joint form, time zone or daylight-saving time information synchronously can not be handed down to the defect of the ONU of lower floor.

Simultaneously, compared with prior art, ONU of the prior art directly obtains the GMT time from ntp server, because the ONU in network is that magnanimity lays, under each OLT, can lay several thousand ONU, between the ONU that these magnanimity lay and described NTP communication connection will produce load to ntp server, and ONU passes through upper strata OLT from the ntp server synchronization gain GMT time in the method that the embodiment of the present invention provides, because the cloth of OLT in network is high-volume far smaller than ONU, by OLT, communicate by letter and can greatly reduce the load of ntp server with described ntp server.

Embodiment 2

The embodiment of the present invention provides a kind of method for synchronizing time, as shown in Figure 3, said method comprising the steps of:

301, OLT is according to the upper pre-configured ntp server information of described OLT, to described ntp server transmitting time synchronization request.

OLT when access network, network management personnel can be on described OLT pre-configured ntp server information and the on-site time zone of described OLT and daylight-saving time information.Described OLT, can be according to pre-configured ntp server information to described ntp server transmitting time synchronization request after access network.Here it should be noted that, described OLT can, immediately to described ntp server transmitting time synchronization request after access network, also can be take the scheduled time as the cycle regularly to described ntp server transmitting time synchronization request by other times.

302, described ntp server receives after described time synchronized request, to described OLT, returns to the GMT time.

303, ONU registers and reaches the standard grade on OLT.

Described ONU, when access network, need to register on OLT, and this register flow path is prior art, is not described in detail in this.

304, described OLT sends to the ONU that registration is reached the standard grade on described OLT the message message that carries the on-site time zone of described OLT and daylight-saving time information, and the on-site time zone of described OLT and daylight-saving time information have been pre-configured on described OLT.

Described ONU registers and reaches the standard grade on described OLT, and described OLT can send to described ONU the message message that carries the on-site time zone of described OLT and daylight-saving time information at once.Described message message can be OMCI/OAM message, and the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the on-site time zone of described OLT and daylight-saving time information is as shown in table 1.

305, the GMT time timing that described OLT sends according to described ntp server obtains the current GMT time, and the described current GMT time is carried to message message sends to described ONU.

Described OLT records GMT that described ntp server sends after the time, can own timing obtain the current GMT time, then the described current GMT time is carried at and in message message, sends to described ONU.Described OLT can carry the message message of current GMT time to all ONU broadcast under described OLT in Preset Time timing, also can to described ONU, send the message message that carry the current GMT time separately, at this, does not limit.The described message message that carries the current GMT time can be OMCI/OAM message, and the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the described current GMT time is as shown in table 2.

306, the on-site time zone of described OLT in the described ONU basis message message receiving and daylight-saving time information and described current GMT Time Calculation obtain the local zone time of ONU.

Described ONU is according to the on-site time zone of described OLT and daylight-saving time information and the described current GMT time of carrying in the message packet receiving, pass through formula: local zone time=current GMT time+time zone+daylight-saving time is offset, and just can calculate the local zone time of ONU.ONU can synchronously become the local zone time of described ONU by the current system time of this ONU, when the subscriber equipment under described ONU needs the business such as caller identification like this, described ONU just can be handed down to described subscriber equipment by modes such as FSK by the local zone time of described ONU, described subscriber equipment just can demonstrate local zone time accurately, for user's work and life offers convenience.

Optionally, in order more accurately to calculate local zone time, as shown in Figure 4, after step 304, described method can also comprise the following steps:

3051, described ONU sends the message message that carries the ONU timestamp A1 while leaving ONU to described OLT.

ONU can send a message message to OLT to OLT, ONU timestamp A1 when carrying this message message in this message message and leaving ONU, the system time that described ONU timestamp A1 is described ONU, the time when clock system of described ONU self can timing obtains this message message and leaves ONU.

3052, described OLT is when carrying the message message of A1 described in receiving, can in the message message of the described A1 of carrying, add the OLT timestamp B1 of this message message while arriving described OLT and this message message OLT timestamp B2 while leaving described OLT, and this message message is sent to described ONU.

When the described message message that carries A1 arrives OLT, described OLT can add the OLT timestamp B1 of described message message while arriving described OLT in the message message of the described A1 of carrying, and when this message message is left described OLT and is back to ONU, can in this message message, add the OLT timestamp B2 while leaving described OLT.The GMT that described OLT receives described ntp server transmission can carry out GMT time timing after the time, and described OLT timestamp B1 and B2 are that described OLT carries out the GMT time that GMT time timing obtains.

3053, described ONU receives the message message that carries A1 and B1 and B2 that described OLT returns, and records the ONU timestamp A2 that described message message arrives described ONU.

While carrying the message message of A1 and B 1 and B2 described in described ONU receives, can in this message message, add the timestamp A2 that a described message message arrives described ONU.Described ONU timestamp A2 is also the system time of described ONU.

Message message described in step 3051～step 3053 process can be OMCI/OAM message, and the described OMCI message of here take is example, and the substantial definition that carries timestamp A1, B1, B2 and A2 is as shown in table 3:

Table 3

3054, in the described ONU basis message message receiving, A1, B1 and B2 and described A2 calculate the time difference t between described ONU and described OLT.

ONU sends in OLT receiving course, and the time of transmission is T1, and the time difference (being defined as the difference of the time of OLT and the time of ONU) is t1; OLT sends in ONU receiving course, and the time of transmission is T2, and the time difference (being defined as the difference of the time of OLT and the time of ONU) is t2, the system time that the time of described ONU is described ONU, the GMT time that the time of described OLT is described OLT.At ONU, send in OLT receiving course, Time Calculation meets: A1+t1+T1=B1; OLT sends in ONU receiving course, and Time Calculation meets: B2-t2+T2=A2.

When obtaining the time difference and just can make the GMT time of the synchronous described OLT of ONU, between ONU and OLT, on both direction, the transmission time is very short, thinks that the time difference can not change, t1=t2=t; Therefore there is following formula:

ONU sends in OLT receiving course, and Time Calculation meets: A1+t+T1=B1 (1)

OLT sends in ONU receiving course, and Time Calculation meets: B2-t+T2=A2 (2)

((1)-(2))/2:

t＝((B1-A2)-(A1-B2))-(T1-T2)/2

Given tacit consent to T1=T2 here, t=((B1-A2)-(A1-B2))/2.

The on-site time zone of described OLT in S306, the described ONU basis message packet receiving and daylight-saving time information and described time difference and A2 calculate local zone time.

The message message that carries the GMT time to described ONU transmission due to described OLT needs certain transmission time, and there is certain propagation delay time the GMT time that described ONU receives, is not very accurate.Here, we can calculate the system time of described ONU and the time difference t of the GMT of described OLT between the time, and described time difference t adds that message arrives the ONU timestamp A2 of ONU, is exactly the accurately GMT time that message arrives ONU.Pass through formula: local zone time=GMT time+time zone+daylight-saving time skew=(skew of A2+t+ time zone+daylight-saving time) just can more accurately calculate the local zone time of ONU.

Calculate after local zone time, ONU can synchronously become the local zone time of described ONU by the current system time of this ONU, when the subscriber equipment under described ONU needs the business such as caller identification, described ONU just can be handed down to described subscriber equipment by modes such as FSK by local zone time, described subscriber equipment just can demonstrate local zone time accurately, for user's work and life offers convenience.

The embodiment of the present invention also provides a kind of clock synchronization system, and as shown in Figure 5, described system further comprises: OLT501, ONU502 and ntp server 503.

OLT is connected with ONU by the optical fiber in ODN (English full name is Optical Distribution Network, referred to as optical distribution network), and described OLT501 and described ONU502 communicate by optical fiber.Ntp server, by BRAS (English full name is Broadband Remote Access Server, referred to as BAS Broadband Access Server) and described OLT wireless connections, carries out radio communication between described OLT501 and described ntp server 503.

Described OLT501 is according to the upper pre-configured NTP (Network Time Protocol) ntp server information of described OLT501, and to described ntp server 503 transmitting time synchronization request, ntp server 503 receives the backward described OLT501 of described time synchronized request and returns to the GMT time.

After ONU502 registers and reaches the standard grade on described OLT501, described OLT501 sends the message message that carries the on-site time zone of described OLT501 and daylight-saving time information to described ONU502, the on-site time zone of described OLT501 and daylight-saving time information have been pre-configured on described OLT501.The GMT time timing that described OLT501 also can send according to described ntp server 503 obtains the current GMT time, and the described current GMT time is carried to another message message sends to described ONU502, described ONU502 obtains the local zone time of ONU according to the on-site time zone of described OLT in the message packet receiving and daylight-saving time information and described current GMT Time Calculation.

Optionally, described OLT501 can also receive the message message that carries the ONU timestamp A 1 while leaving ONU that described ONU502 sends, and the OLT timestamp B2 when adding the OLT timestamp B1 of described message message while arriving described OLT and leaving described OLT in the message message of the described A1 of carrying, then send to described ONU502, so that described ONU502 is according to described A1, the ONU timestamp A2 that B1 and B2 and described message message arrive described ONU calculates the time difference between described ONU and described OLT, and the local zone time that calculates ONU according to the on-site time zone of described OLT in the message packet receiving and daylight-saving time information and the described time difference calculating and A2.Like this that the local zone time of the ONU that makes to calculate is more accurate.Calculate after local zone time, ONU can synchronously become the local zone time of described ONU by the current system time of this ONU, when the subscriber equipment under described ONU needs the business such as caller identification, described ONU just can be handed down to described subscriber equipment by modes such as FSK by local zone time, described subscriber equipment just can demonstrate local zone time accurately, for user's work and life offers convenience.

The embodiment of the present invention also provides a kind of OLT, and as shown in Figure 6, described OLT comprises: memory cell 5010, generation unit 5011, transmitting element 5012, receiving element 5013, record cell 5014, timing unit 5015.

Described memory cell 5010, for storing pre-configured NTP (Network Time Protocol) ntp server information; Described generation unit 5011, for the ntp server Information generation time synchronized request of storing according to described memory cell 5010, and sends to transmitting element 5012 by described time synchronized request; Described transmitting element 5012, for sending described time synchronized request, so that described ntp server returns to GMT time Greenwich mean time to described OLT to described ntp server.

OLT when access network, network management personnel can be on described OLT pre-configured ntp server information and the on-site time zone of described OLT and daylight-saving time information be stored in memory cell 5010.Described OLT is after access network, described generation unit 5011 can be according to the ntp server Information generation time synchronized request of described memory cell 5010 interior storages, and described time synchronized request is sent to transmitting element 5012, the transmitting element 5012 of OLT sends to described ntp server by described time synchronized request, and described ntp server can return to the GMT time to described OLT after receiving described time synchronized request.Here it should be noted that, described OLT can, immediately to described ntp server transmitting time synchronization request after access network, also can be take the scheduled time as the cycle regularly to described ntp server transmitting time synchronization request by other times.

Receiving element 5013, the GMT time sending for receiving described ntp server.Record cell 5014, the GMT time sending for recording the described ntp server of described receiving element 5013 receptions.

Described ntp server can immediately return to the GMT time to described OLT after receiving described time synchronized request, because the transmitting element 5012 of described OLT can be take the scheduled time as the cycle regularly to described ntp server transmitting time synchronization request, therefore the receiving element 5013 of described OLT just can periodically receive the GMT time that described ntp server sends, the GMT time that the described ntp server that record cell 5014 can regularly more new record receiving element 5013 receives returns.

Timing unit 5015, obtains the current GMT time for the GMT time timing sending according to the described ntp server of described record cell 5014 records.

The record cell 5014 of described OLT can be constantly updated and record the GMT time that ntp server that described receiving element 5013 receives sends, and then described timing unit 5015 can constantly obtain the current GMT time of OLT according to the GMT time timing of described ntp server transmission.

Described transmitting element 5012, is further used for sending to the optical network unit ONU that registration is reached the standard grade on described OLT the message message that carries the on-site time zone of described OLT and daylight-saving time information that described generation unit 5011 generates.

Described ONU registers and reaches the standard grade on described OLT, and the transmitting element 5012 of described OLT can send to described ONU the message message that carries the on-site time zone of described OLT and daylight-saving time information that described generation unit 5011 generates at once.The on-site time zone of described OLT and daylight-saving time information have been pre-configured on described OLT.Described message message can be OMCI/OAM message, and the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the on-site time zone of described OLT and daylight-saving time information is as shown in table 1.

Described transmitting element 5012, another message message that carries the current GMT time that described timing unit 5015 timing obtain that is further used for sending to described ONU that described generation unit 5011 generates, so that described ONU obtains the local zone time of ONU according to the on-site time zone of described OLT receiving and daylight-saving time information and described current GMT Time Calculation.

The transmitting element 5012 of described OLT can broadcast to all ONU under described OLT the message message that carries the current GMT time that described generation unit 5011 generates in Preset Time timing, also can to described ONU, send the message message that carries the current GMT time that described generation unit 5011 generates separately, at this, not limit.The described message message that carries the current GMT time can be OMCI/OAM message, and the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the described current GMT time is as shown in table 2.

The on-site time zone of described OLT of carrying in the described ONU basis message packet receiving and daylight-saving time information and described current GMT time can be passed through formula: local zone time=current GMT time+time zone+daylight-saving time skew, calculate the local zone time of ONU, ONU can synchronously become the local zone time of described ONU by the current system time of this ONU, when the subscriber equipment under described ONU needs the business such as caller identification, described ONU just can be handed down to described subscriber equipment by modes such as FSK by local zone time, described subscriber equipment just can demonstrate local zone time accurately, for user's work and life offers convenience.

In embodiments of the present invention, by OLT, to ONU, issue the on-site time zone of described OLT and seasonal information of summer, do not rely on BMS/ITMS and issue time zone and seasonal information of summer, situation for same country/area across a plurality of time zones or a plurality of daylight-saving time intervals, because each OLT coverage is little, ONU under each OLT is in identical time zone and daylight-saving time, do not need each user to configure separately different time zone or daylight-saving time, make the workload of OLT less than the workload of BMS/ITMS in prior art, thereby reduced the workload in synchronous time zone or summertime process.And described OLT can by with ONU between protocol massages message send to ONU under easily described time zone or daylight-saving time information being synchronizeed, cannot manage the ONU of bridge joint form when overcoming ITMS described in prior art, time zone or daylight-saving time information synchronously can not be handed down to the defect of the ONU of lower floor.

Simultaneously, compared with prior art, ONU of the prior art directly obtains the GMT time from ntp server, because the ONU in network is that magnanimity lays, under each OLT, can lay several thousand ONU, between the ONU that these magnanimity lay and described NTP communication connection will produce load to ntp server, and in embodiments of the present invention, ONU passes through upper strata OLT from the ntp server synchronization gain GMT time, because the cloth of OLT in network is high-volume far smaller than ONU, by OLT, communicate by letter and can greatly reduce the load of ntp server with described ntp server.

Further, described receiver module unit 5013, is further used for receiving the message message that carries the ONU timestamp A1 while leaving ONU that described ONU sends; Described generation module unit 5011, OLT timestamp B2 when adding the OLT timestamp B1 of described message message while arriving described OLT in the message message of the described A1 of carrying and leaving described OLT, generation carries the message message of A1, B1 and B2, and the message message of the described A1 of carrying, B1 and B2 is sent to described sending module unit 5013.

Described transmitting element 5013 is further used for the message message of the described A1 of carrying, B1 and B2 to send to described ONU, so that described ONU arrives the ONU timestamp A2 of described ONU according to described A1, B1 and B2 and described message message, calculate the time difference between described ONU and described OLT, and calculate local zone time according to the on-site time zone of described OLT in the message packet receiving and daylight-saving time information and described time difference and A2; Wherein, the system time that described ONU timestamp A1 and A2 are described ONU, the GMT time that described OLT timestamp B1 and the B2 GMT time timing that to be described OLT send according to described ntp server obtains, the message message of the use of communicating by letter between described OLT and described ONU is OMCI/OAM message.The time difference calculating can be by the GMT time synchronized of OLT to ONU, makes the local zone time that calculates more accurate.

The embodiment of the present invention also provides a kind of ONU, and as shown in Figure 7, described ONU comprises: receiving element 5020, computing unit 5021.

Receiving element 5020, the message message that carries the on-site time zone of described OLT and daylight-saving time information sending for receiving OLT.

OLT when access network, network management personnel can be on described OLT the on-site time zone of pre-configured described OLT and daylight-saving time information.After described ONU registers and reaches the standard grade on described OLT, described OLT can send to described ONU the message message that carries the on-site time zone of described OLT and daylight-saving time information at once.Receiving element 5020 receives described message message, and described message message can be OMCI/OAM message, and the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the on-site time zone of described OLT and daylight-saving time information is as shown in table 1.Generally, all ONU under an OLT are in the on-site time zone of described OLT and daylight-saving time, so the on-site time zone of described OLT and daylight-saving time information are exactly the on-site time zone of described ONU and daylight-saving time information.

Described receiving element 5020, is further used for receiving another message message that carries the current GMT time that described OLT sends, and the described current GMT time is that the GMT time timing being sent according to ntp server by described OLT obtains.

OLT can be regularly from the described ntp server synchronization gain GMT time, and then own timing obtains the current GMT time.At OLT, to described ONU, send and carry after the message message of the on-site time zone of described OLT and daylight-saving time information, described OLT also can be carried at the described current GMT time in another message message and send to described ONU, described in receiving, described receiving element 5020 carries the message message of current GMT time, described message message can be OMCI/OAM message, the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the described current GMT time is as shown in table 2.

Computing unit 5021, the on-site time zone of described OLT of the message message receiving for basis and daylight-saving time information and described current GMT Time Calculation obtain local zone time.Its computing formula is: local zone time=current GMT time+time zone+daylight-saving time skew.

Optionally, described ONU further comprises: generation unit 5022, transmitting element 5023.

Generation unit 5022, for generating the message message that carries the ONU timestamp A1 while leaving ONU, and sends to transmitting element 5023 by the message message of the described A1 of carrying; Described transmitting element 5023, for the message message to carrying A1 described in described OLT transmission.

Described receiving element 5020, the message message of the OLT timestamp B2 when being further used for receiving the OLT timestamp B1 that described OLT returns when carrying A1 and described message message and arriving described OLT and leaving described OLT.

Described generation unit 5022, be further used for adding the ONU timestamp A2 that described message message arrives described ONU in the message message of the described A1 of carrying, B1 and B2, generation carries the message message of A1, A2, B1 and B2, wherein, the system time that described ONU timestamp A1 and A2 are described ONU, described OLT timestamp B1 and B2 are the GMT time that described OLT obtains according to the GMT time timing of described ntp server transmission.

Described computing unit 5021, A1, B1, B2 and A2 in the message message that is further used for generating according to described generation unit calculate the time difference t between described ONU and described OLT, and described t meets following formula:

t＝((B1-A2)-(A1-B2))/2。

Suppose that ONU sends in OLT receiving course here, the time of transmission is T1, and the time difference (being defined as the difference of the time of OLT and the time of ONU) is t1; OLT sends in ONU receiving course, and the time of transmission is T2, and the time difference (being defined as the difference of the time of OLT and the time of ONU) is t2, the system time that the time of described ONU is described ONU, the GMT time that the time of described OLT is described OLT.ONU sends in OLT receiving course, and Time Calculation meets: A1+t1+T1=B1; OLT sends in ONU receiving course, and Time Calculation meets: B2-t2+T2=A2.

We are now calculative is exactly the time difference, and obtaining the time difference just can be by the GMT time synchronized of OLT to described ONU, and between ONU and OLT, on both direction, the transmission time is very short, thinks that the time difference can not change, t1=t2=t; Therefore there is following formula:

ONU sends in OLT receiving course, and Time Calculation meets: A1+t+T1=B1 (1)

OLT sends in ONU receiving course, and Time Calculation meets: B2-t+T2=A2 (2)

((1)-(2))/2:

t＝((B1-A2)-(A1-B2))-(T1-T2)/2

Given tacit consent to T1=T2 here, t=((B1-A2)-(A1-B2))/2.

Described computing unit 5021, is further used for calculating according to the on-site time zone of described OLT in the message packet receiving and daylight-saving time information and described time difference and A2 the local zone time of ONU.

Here, we can calculate the system time of described ONU and the time difference t of the GMT of described OLT between the time, and described time difference t adds that message arrives the ONU timestamp A2 of ONU, is exactly the accurately GMT time that message arrives ONU.Pass through formula: local zone time=GMT time+time zone+daylight-saving time skew=(skew of A2+t+ time zone+daylight-saving time) just can more accurately calculate the local zone time of ONU.Calculate after local zone time, ONU can synchronously become the local zone time of described ONU by the current system time of this ONU, when the subscriber equipment under described ONU needs the business such as caller identification, described ONU just can be handed down to described subscriber equipment by modes such as FSK by local zone time, described subscriber equipment just can demonstrate local zone time accurately, for user's work and life offers convenience.

The embodiment of the present invention also provides a kind of OLT, and as shown in Figure 8, described OLT comprises transmitter 5016, receiver 5017, memory 5018 and processor 5019.

Memory 5018, for storing pre-configured NTP (Network Time Protocol) ntp server information; Processor 5017, for the ntp server Information generation time synchronized request of storing according to described memory 5018, and sends to transmitter 5016 by described time synchronized request; Described transmitter 5016, for sending described time synchronized request, so that described ntp server returns to GMT time Greenwich mean time to described OLT to described ntp server.

OLT when access network, network management personnel can be on described OLT pre-configured ntp server information and the on-site time zone of described OLT and daylight-saving time information, be stored in described memory 5018.Described OLT is after access network, and the time synchronized request that the transmitter 5016 meeting processors 5017 of OLT generate sends to described ntp server, and described ntp server can return to the GMT time to described OLT after receiving described time synchronized request.Here it should be noted that, described OLT can, immediately to described ntp server transmitting time synchronization request after access network, also can be take the scheduled time as the cycle regularly to described ntp server transmitting time synchronization request by other times.

Receiver 5017, the GMT time sending for receiving described ntp server.Described memory 5018, the GMT time sending for storing the described ntp server of described receiving element reception.

Described ntp server can immediately return to the GMT time to described OLT after receiving described time synchronized request, because the transmitter 5016 of described OLT can be take the scheduled time as the cycle regularly to described ntp server transmitting time synchronization request, therefore the receiver 5017 of described OLT just can periodically receive the GMT time that described ntp server sends, the GMT time that the memory 5018 described ntp server that more new record receiver 5017 receives returns.

Described processor 5019, obtains the current GMT time for the GMT time timing sending according to the described ntp server of described memory cell 5018 storages.

The memory 5018 of described OLT can be constantly updated and record the GMT time that ntp server that described receiver 5017 receives sends, and the GMT time timing that then described processor 5019 can send according to described ntp server obtain the current GMT time of OLT.

Described transmitter 5016, is further used for sending to the ONU that registration is reached the standard grade on described OLT the message message that carries the on-site time zone of described OLT and daylight-saving time information that described processor generates.

Described ONU registers and reaches the standard grade on described OLT, and the transmitter 5016 of described OLT can send to described ONU the message message that carries the on-site time zone of described OLT and daylight-saving time information that described processor 5019 generates at once.The on-site time zone of described OLT and daylight-saving time information have been pre-configured on described OLT.Described message message can be OMCI/OAM message, and the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the on-site time zone of described OLT and daylight-saving time information is as shown in table 1.

Described transmitter 5016, be further used for sending to described ONU another message message that carries the described current GMT time that described processor 5019 generates, so that the on-site time zone of described OLT that described ONU basis receives and daylight-saving time information and described current GMT Time Calculation obtain the local zone time of ONU.

The transmitter 5016 of described OLT can broadcast to all ONU under described OLT the message message that carries the current GMT time that described processor 5019 generates in Preset Time timing, also can to described ONU, send the message message that carries the current GMT time that described processor 5019 generates separately, at this, not limit.The described message message that carries the current GMT time can be OMCI/OAM message, and the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the described current GMT time is as shown in table 2.

The on-site time zone of described OLT of carrying in the described ONU basis message packet receiving and daylight-saving time information and described current GMT time can be passed through formula: local zone time=current GMT time+time zone+daylight-saving time skew, calculate the local zone time of ONU, ONU can synchronously become the local zone time of described ONU by the current system time of this ONU, when the subscriber equipment under described ONU needs the business such as caller identification like this, described ONU just can be handed down to described subscriber equipment by modes such as FSK by local zone time, described subscriber equipment just can demonstrate local zone time accurately, for user's work and life offers convenience.

Optionally, described receiver 5017, is further used for receiving the message message that carries the ONU timestamp A1 while leaving ONU that described ONU sends; Described processor 5019, OLT timestamp B2 when adding the OLT timestamp B1 of described message message while arriving described OLT in the message message of the described A1 of carrying and leaving described OLT, generation carries the message message of A1, B1 and B2, and the message message of the described A1 of carrying, B1 and B2 is sent to described transmitting element 5016.

Described transmitter 5016, be further used for the message message of the described A1 of carrying, B1 and B2 to send to described ONU, so that described ONU arrives the ONU timestamp A2 of described ONU according to described A1, B1 and B2 and described message message, calculate the time difference between described ONU and described OLT, and according to the on-site time zone of described OLT in the message packet receiving and daylight-saving time information and described time difference and A2, calculate the local zone time of ONU; Wherein, the system time that described ONU timestamp A1 and A2 are described ONU, described OLT timestamp B1 and B2 are the GMT time that described OLT obtains according to the GMT time timing of described ntp server transmission.The time difference calculating can be by the GMT time synchronized of OLT to ONU, makes the local zone time that calculates more accurate.

The embodiment of the present invention also provides a kind of ONU, and as shown in Figure 9, described ONU comprises: receiver 5024 and processor 5025.

Receiver 5024, the message message that carries the on-site time zone of described OLT and daylight-saving time information sending for receiving OLT.

OLT when access network, network management personnel can be on described OLT the on-site time zone of pre-configured described OLT and daylight-saving time information.After described ONU registers and reaches the standard grade on described OLT, described OLT can send to described ONU the message message that carries the on-site time zone of described OLT and daylight-saving time information at once.Receiver 5024 receives described message message, and described message message can be OMCI/OAM message, and the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the on-site time zone of described OLT and daylight-saving time information is as shown in table 1.Generally, all ONU under an OLT are in the on-site time zone of described OLT and daylight-saving time, so the on-site time zone of described OLT and daylight-saving time information are exactly the on-site time zone of described ONU and daylight-saving time information.

Described receiver 5024, is further used for receiving another message message that carries the current GMT time that described OLT sends, and the described current GMT time is that the GMT time timing being sent according to ntp server by described OLT obtains.

OLT can be regularly from the described ntp server synchronization gain GMT time, and then own timing obtains the current GMT time.At OLT, to described ONU, send and carry after the message message of the on-site time zone of described OLT and daylight-saving time information, described OLT also can be carried at the described current GMT time in another message message and send to described ONU, described in receiving, described receiver 5024 carries the message message of current GMT time, described message message can be OMCI/OAM message, the described OMCI message of here take is example, and the substantial definition of OMCI message that carries the described current GMT time is as shown in table 2.

Processor 5025, the on-site time zone of described OLT of the message message receiving for basis and daylight-saving time information and described current GMT Time Calculation obtain the local zone time of ONU.Its computing formula is: local zone time=current GMT time+time zone+daylight-saving time skew.

Optionally, described ONU further comprises: transmitter 5026.

Described processor 5025, for generating the message message that carries the ONU timestamp A1 while leaving ONU, and sends to transmitter by the message message of the described A1 of carrying.Described transmitter 5026, is further used for sending to described OLT the message message that carries the ONU timestamp A1 while leaving ONU.

Described receiver 5024, the message message of the OLT timestamp B2 when being further used for receiving the OLT timestamp B1 that described OLT returns when carrying A1 and described message message and arriving described OLT and leaving described OLT.

Described processor 5025, be further used for adding the ONU timestamp A2 that described message message arrives described ONU in the message message of the described A1 of carrying, B1 and B2, generation carries the message message of A1, A2, B1 and B2, wherein, the system time that described ONU timestamp A1 and A2 are described ONU, described OLT timestamp B1 and B2 are the GMT time that described OLT obtains according to the GMT time timing of described ntp server transmission.

Described processor 5025, is further used for calculating the time difference t between described ONU and described OLT according to A1, B1, B2 and A2 in message message, and described t meets following formula:

t＝((B1-A2)-(A1-B2))/2。

ONU sends in OLT receiving course, and Time Calculation meets: A1+t+T1=B1 (1)

OLT sends in ONU receiving course, and Time Calculation meets: B2-t+T2=A2 (2)

((1)-(2))/2:

t＝((B1-A2)-(A1-B2))-(T1-T2)/2

Given tacit consent to T1=T2 here, t=((B 1-A2)-(A1-B2))/2.

Described processor 5025, is further used for calculating according to the on-site time zone of described OLT in the message packet receiving and daylight-saving time information and described time difference and A2 the local zone time of ONU.

In embodiments of the present invention, by OLT, to ONU, issue the on-site time zone of described OLT and seasonal information of summer, do not rely on BMS/ITMS and issue time zone and seasonal information of summer, situation for same country/area across a plurality of time zones or a plurality of daylight-saving time intervals, because the ONU under described OLT is in identical time zone and daylight-saving time, do not need each user to configure separately different time zone or daylight-saving time, make the workload of OLT less than the workload of BMS/ITMS in prior art, thereby reduced the workload in synchronous time zone or summertime process.And described OLT can by with ONU between protocol massages message send to ONU under easily described time zone or daylight-saving time information being synchronizeed, while overcoming ITMS described in prior art, cannot manage bridge joint form ONU, time zone or daylight-saving time information synchronously can not be handed down to the defect of the ONU of lower floor.Simultaneously, compared with prior art, ONU of the prior art directly obtains the GMT time from ntp server, because the ONU in network is that magnanimity lays, under each OLT, can lay several thousand ONU, between the ONU that these magnanimity lay and described NTP communication connection will produce load to ntp server, and ONU passes through upper strata OLT from the ntp server synchronization gain GMT time in the method that the embodiment of the present invention provides, because the cloth of OLT in network is high-volume far smaller than ONU, by OLT, communicate by letter and can greatly reduce the load of ntp server with described ntp server.

In addition, by calculating the time difference of ONU and OLT, to described ONU, can make the local zone time that finally calculates more accurate the GMT time precise synchronization of described OLT.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.

The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.

Claims

1. a method for synchronizing time, is characterized in that, is applied to optical line terminal OLT, comprising:

According to the upper pre-configured NTP (Network Time Protocol) ntp server information of described OLT, to described ntp server transmitting time synchronization request, so that described ntp server returns to GMT time Greenwich mean time to described OLT;

Receive and record the GMT time that described ntp server sends;

Described OLT sends to the optical network unit ONU that registration is reached the standard grade on described OLT the message message that carries the on-site time zone of described OLT and daylight-saving time information;

The GMT time timing that described OLT sends according to described ntp server obtains the current GMT time, and the described current GMT time is carried in another message message and sends to described ONU, so that the on-site time zone of described OLT that described ONU basis receives and daylight-saving time information and described current GMT Time Calculation obtain the local zone time of ONU.

2. method according to claim 1, is characterized in that, at described OLT, after described ONU transmission carries the message message of the on-site time zone of described OLT and daylight-saving time information, described method further comprises:

3. method according to claim 1 and 2, is characterized in that, the message message of the use of communicating by letter between described OLT and described ONU is OMCI/OAM message.

4. a method for synchronizing time, is characterized in that, is applied to optical network unit ONU, comprising:

Described ONU receives the message message that carries the on-site time zone of described OLT and daylight-saving time information that OLT sends;

Described ONU receives another message message that carries the current GMT time that described OLT sends, and the described current GMT time is that the GMT time timing being sent according to ntp server by described OLT obtains;

The on-site time zone of described OLT in the described ONU basis message message receiving and daylight-saving time information and described current GMT Time Calculation obtain the local zone time of ONU.

5. method according to claim 4, is characterized in that, after receiving the message message that carries the on-site time zone of described OLT and daylight-saving time information that OLT sends, described method further comprises:

Described ONU sends the message message that carries the ONU timestamp A1 while leaving ONU to described OLT;

The message message of the OLT timestamp B1 that described ONU receives that described OLT returns when carrying A1 and described message message and arriving described OLT and the OLT timestamp B2 while leaving described OLT, and in described message message, add the ONU timestamp A2 that described message message arrives described ONU, wherein, the system time that described ONU timestamp A1 and A2 are described ONU, described OLT timestamp B1 and B2 are the GMT time that described OLT obtains according to the GMT time timing of described ntp server transmission;

Described ONU calculates the time difference t between described ONU and described OLT according to the A1 in message message, B1, B2 and A2, and described t meets following formula:

t＝((B1-A2)-(A1-B2))/2；

The on-site time zone of described OLT in the described ONU basis message packet receiving and daylight-saving time information and described time difference and A2 calculate the local zone time of ONU.

6. according to the method described in claim 4 or 5, it is characterized in that, the message message of the use of communicating by letter between described ONU and described OLT is OMCI/OAM message.

7. an optical line terminal OLT, is characterized in that, comprising:

Generation unit, for according to the ntp server Information generation time synchronized request of described cell stores;

Transmitting element, for sending described time synchronized request, so that described ntp server returns to GMT time Greenwich mean time to described OLT to described ntp server;

Receiving element, the GMT time sending for receiving described ntp server;

Record cell, the GMT time sending for recording the described ntp server of described receiving element reception;

Timing unit, obtains the current GMT time for the GMT time timing sending according to the described ntp server of described recording unit records;

8. OLT according to claim 7, is characterized in that,

Described receiving element, is further used for receiving the message message that carries the ONU timestamp A1 while leaving ONU that described ONU sends;

9. according to the OLT described in claim 7 or 8, it is characterized in that, the message message of the use of communicating by letter between described OLT and described ONU is OMCI/OAM message.

10. an optical network unit ONU, is characterized in that, comprising:

11. ONU according to claim 10, is characterized in that, described ONU further comprises:

Generation unit, for generating the message message that carries the ONU timestamp A1 while leaving ONU;

Transmitting element, for the message message to carrying A1 described in described OLT transmission;

Described generation unit, be further used for adding the ONU timestamp A2 that described message message arrives described ONU in the message message of the described A1 of carrying, B1 and B2, generation carries the message message of A1, A2, B 1 and B2, wherein, the system time that described ONU timestamp A1 and A2 are described ONU, described OLT timestamp B1 and B2 are the GMT time that described OLT obtains according to the GMT time timing of described ntp server transmission;

t＝((B1-A2)-(A1-B2))/2；

12. according to the ONU described in claim 10 or 11, it is characterized in that, the message message of the use of communicating by letter between described ONU and described OLT is OMCI/OAM message.

13. 1 kinds of optical line terminal OLT, is characterized in that, comprising:

Receiver, the GMT time sending for receiving described ntp server;

Described memory, is further used for storing the GMT time that described ntp server that described receiving element receives sends;

Described processor, the GMT time timing that is further used for sending according to the described ntp server of described cell stores obtains the current GMT time;

14. OLT according to claim 13, is characterized in that,

Described receiver, is further used for receiving the message message that carries the ONU timestamp A1 while leaving ONU that described ONU sends;

15. according to the OLT described in claim 13 or 14, it is characterized in that, the message message of the use of communicating by letter between described OLT and described ONU is OMCI/OAM message.

16. 1 kinds of optical network unit ONU, is characterized in that, comprising:

17. according to ONU described in claim 16, it is characterized in that, described ONU further comprises:

Described processor, is further used for generation and carries the message message of the ONU timestamp A1 while leaving ONU, and the message message of the described A1 of carrying is sent to transmitter;

t＝((B1-A2)-(A1-B2))/2；

18. according to the ONU described in claim 16 or 17, it is characterized in that, the message message of the use of communicating by letter between described ONU and described OLT is OMCI/OAM message.