CN103957592A - Implementing method and device for time synchronization between femtocells - Google Patents

Abstract

An implementing method and device for time synchronization between femtocells relate to the field of mobile communication. The implementing method comprises the steps that 1, the femtocell requiring for synchronization sends a synchronization request; 2, a femtocell managing system inquires whether a service area where the femtocell is located includes the femtocell which can provide a reference master clock after receiving the synchronization request, the femtocell requiring for synchronization can adjust time migration according to the reference master clock of the femtocell if the service area includes the femtocell which can provide the reference master clock, or the step 3 is carried out if the service area doesn't include the femtocell which can provide the reference master clock; 3, the femtocell requiring for synchronization starts a UE mode to monitor whether a macro base station exists around the femtocell requiring for synchronization, time synchronization can be finished by monitoring and detecting synchronization signals of the macro base station if the macro base station exists around the femtocell requiring for synchronization, or the step 4 is carried out if the macro base station doesn't exist around the macro base station; 4 the femtocell requiring for synchronization triggers the femtocell managing system to play synchronization message in a group mode, and the femtocell requiring for synchronization can adjust time migration according to the deviation value between the time for the femtocell requiring for synchronization to receive the synchronization message and the time for the other femtocells in the service area where the femtocell requiring for synchronization is located to receive the synchronization message.

Description

The implementation method of time synchronized and device between a kind of Home eNodeB

Technical field

The present invention relates to moving communicating field, especially relate to Home eNodeB (HNB/HeNB, Home NodeB/eNodeB) time synchronized, reduce broadband metropolitan area network network expense, improve adjacent Home eNodeB synchronization accuracy, thereby reduce the implementation method of time synchronized between a kind of Home eNodeB that adjacent Home eNodeB disturbs.

Background technology

Along with the development of mobile communication, in order to increase channeling degree, expand residence user content, and promote user's experience, Home eNodeB receives increasing concern.But Home eNodeB, apart from large scale investment commercialization, also has some key technologies to have to be solved, such as the stationary problem between Home eNodeB.Various access standards have different requirements to Frequency Synchronization and Phase synchronization.In general time division duplex (TDD, Time Division Duplexing) needs frequency/phase synchronous, i.e. time synchronized, and its Home eNodeB Phase synchronization trueness error requires in 3 μ s; And Frequency Division Duplexing (FDD) (FDD, Frequency Division Duplexing) is only required Frequency Synchronization.Existing Home eNodeB synchronization solutions comprises that GPS is synchronous, air interface synchronization and IEEE1588 synchronous etc.

By global positioning system (GPS, Global Positioning System) signal synchronously has the feature that synchronization accuracy is high, but Home eNodeB is positioned at indoor, indoor weak GPS signals cannot ensure the synchronization accuracy requirement of Home eNodeB, and need to install GPS additional at each Home eNodeB, the cost of Home eNodeB is significantly improved, and this is that user is not acceptant.

Air interface synchronization does not need to install additional hardware device, only need Home eNodeB to receive the macro base station information of eating dishes without rice or wine, intercept macro base station downlink reference signal but need Home eNodeB to be switched to terminal pattern, this declines the throughput of Home eNodeB, and user's experience is affected.And due to the difference of macro base station coverage condition, not every Home eNodeB can receive the downlink reference signal of macro base station.

The course of work of IEEE1588 time synchronization protocol is divided into two stages.First stage: master clock cycle ground is given from clock and sent Sync message, and this sync message Sync comprises that this message leaves the time Estimate value of master clock.Master clock sends Follow_Up message subsequently, and this message carries Sync message delivery time T1 accurately.From clock in the accurate arrival time T 2 of receiving message Sync message postscript.Second stage: delay measurements stage.From time clockwise master clock send one and postpone request Delay_Req message, record the actual transmitting time T3 of this message simultaneously.Master clock record postpones the correct time T4 that request message arrives, and then in delay request response message Delay_Resp, T4 is sent back to from clock.T1, T2, T3, T4 meet:

T2=T1+Delay+Offset （1）

T4=T3+Delay-Offset （2）

Wherein Delay is two ends propagation delay time.Can obtain time deviation value from clock according to formula (1), (2):

$\mathrm{offset}=\frac{T_2-T_1+T_3-T_4}{2}---\left(3\right)$

Synchronization mechanism is known thus, and IEEE1588 protocol requirement uplink and downlink transmission link must be symmetrical, i.e. uplink time delay must equate with downlink transfer time delay.For make Home eNodeB can with IP clock server (IP CLK, IP Clock Server) in master clock obtain synchronously, IEEE1588 message lock in time need to be through the return network of Home eNodeB.Because Home eNodeB return network generally adopts broadband transmission network, IEEE1588 message lock in time must pass through Access Layer, convergence-level, core layer forwarding, cannot ensure the identical of uplink downlink.Meanwhile, because message exists queuing delay shake in node repeating process, and a router queue is waited for the general Normal Distribution W～N(0 of delay variation scope w, σ ²), white noise distributes, and forwards through n router, waits in line delay variation and obeys W～N(0, n σ ²).This makes uplink and downlink transmission link time delay can not ensure symmetry.

For the Home eNodeB based on TDD, if can not realize the time synchronized between base station, will between neighbor cell, cause great interference, make it cannot proper communication.IEEE1588v2 has increased the mechanism such as delay process and transparent clock on the basis of IEEE1588v1, do improvement from the aspect such as synchronization principles, synchronizing process, can meet Home eNodeB time synchronized demand, but require whole network equipment all must support IEEE1588v2 agreement.

Summary of the invention

The shortcoming and the existing Home eNodeB return network that the object of the invention is to exist for air interface synchronization are not all supported the deficiency of 1588v2 agreement, provide combine eat dishes without rice or wine and a kind of Home eNodeB of return network between implementation method and the device of time synchronized.

Time synchronized implementation method between described Home eNodeB, comprises the following steps:

1), ask synchronous Home eNodeB to send synchronization request;

2), Home eNodeB management system receives after the synchronous Home eNodeB synchronization request of described request, inquire about described Home eNodeB place service area whether the Home eNodeB providing with reference to master clock is provided, if exist, the synchronous Home eNodeB of described request carries out time migration adjustment with this clock with reference to the Home eNodeB of master clock; Otherwise, carry out step 3);

3), ask synchronous Home eNodeB to start UE pattern, intercept and whether have macro base station around, if exist, synchronous by the synchronizing signal deadline of this macro base station of listening detection; Otherwise, carry out step 4);

4), the synchronous Home eNodeB of described request triggers Home eNodeB management system multicast sync message, the time that the synchronous Home eNodeB of described request receives described sync message according to it Home eNodeB place other Home eNodeB of service area of synchronizeing with this request receive the deviant of the time of described sync message and do time migration adjustment.

Step 2) in specifically comprise the following steps:

21), Home eNodeB management system sends variable exist for really notifying to the synchronous Home eNodeB of request;

22), Home eNodeB management system multicast sync message S gives described Home eNodeB place service area;

23), ask synchronous Home eNodeB and record respectively and feed back its time that receives sync message S to Home eNodeB management system with reference to the Home eNodeB of master clock;

24), Home eNodeB management system is according to the synchronous Home eNodeB of described request and receive time of sync message S with reference to the Home eNodeB of master clock, the time deviation mean value of the synchronous Home eNodeB of computation requests;

25), time deviation mean value is passed to the synchronous Home eNodeB of request by Home eNodeB management system;

26) ask synchronous Home eNodeB to do time synchronized adjustment according to described time deviation mean value;

27), whether be true, if true, turn back to step 22 if detecting exist through fixed cycle Home eNodeB), continue to synchronize with the Home eNodeB with reference to master clock; If NO, Home eNodeB carries out step 3).

Described Home eNodeB management system can be according to following formula deviant computing time:

$T_{\mathrm{offset}\_1}^i=T_{\mathrm{req}}^i-T_m^i$

Wherein, be the subsynchronous message S of i gained time deviation, for asking synchronous Home eNodeB to receive time of the subsynchronous message S of i, for receive the time of the subsynchronous message S of i with reference to the Home eNodeB of master clock.

Described Home eNodeB management system can be according to following formula deviation computing time mean value:

$T_{\mathrm{offset}\_1}=\frac{1}{M}\underset{i=1}{\overset{M}{\mathrm{\Σ}}}{T}_{\mathrm{offset}\_1}^i$

Wherein, T _{offset_1}for time deviation mean value, M is the synchronous Home eNodeB of the request chosen of Home eNodeB management system and the group number that receives sync message S with reference to the Home eNodeB of master clock.

Step 3) specifically comprises the following steps:

31), ask synchronous Home eNodeB to obtain the master sync signal (PSS, Primary Synchronization Signal) of macro base station by listening detection, realize time synchronized and coarse frequency is synchronous, complete initial synchronisation;

32), ask synchronous Home eNodeB to obtain auxiliary synchronous signals (SSS, the Secondary Synchronization Signal) signal of macro base station by listening detection, realize smart Frequency Synchronization;

33), ask synchronous Home eNodeB with cycle T _macsynchronous to macro base station, i.e. repeating step 31)～33).

Step 3) is further comprising the steps of:

34), complete synchronous after, Home eNodeB sends its ID and IP to Home eNodeB management system, Home eNodeB management system will the synchronous Home eNodeB of request be made as the Home eNodeB of the reference master clock of its place service area; And issue a change exist variable for really notifying to other Home eNodeB of affiliated service area;

35) if Home eNodeB management system detects the Home eNodeB shutdown of service area internal reference master clock place or other reasons to exit network, issuing a change exist variable to other Home eNodeB of affiliated service area is no information.

Step 4) specifically comprises the following steps:

41), Home eNodeB management system is to the synchronous Home eNodeB place service area multicast sync message S of request;

42), ask synchronous Home eNodeB to record it to receive the time of sync message S and be sent to Home eNodeB management system, other Home eNodeB records of the synchronous Home eNodeB place service area of described request receive sync message S times and are sent to Home eNodeB management system;

43), Home eNodeB management system receives the time of sync message S and the time of other Home eNodeB reception sync messages of its place service area S, the time deviation value mean value of the synchronous Home eNodeB of computation requests according to the synchronous Home eNodeB of described request;

44), time deviation value mean value is passed to the synchronous Home eNodeB of request by Home eNodeB management system;

45), ask synchronous Home eNodeB to do time synchronized adjustment according to described time deviation value mean value;

46), ask synchronous Home eNodeB every cycle T ' whether be true, if true, synchronize with the Home eNodeB with reference to master clock, i.e. step 2 if detecting indexed variable exist).

Described Home eNodeB management system can be calculated according to following formula the time offset value of the synchronous Home eNodeB of described request:

$T_{\mathrm{offset}\_2}^i=\frac{1}{N}\underset{\mathrm{other}\_j=1}{\overset{N}{\mathrm{\Σ}}}(T_{\mathrm{req}}^i-T_{\mathrm{other}\_j}^i)$

Wherein, be the subsynchronous message S of i gained time deviation value, for asking the time of the i time reception sync message S of synchronous Home eNodeB, for the time of reception of the subsynchronous message S of the synchronous Home eNodeB of described request place service area other Home eNodeB i, N is the quantity of place service area other Home eNodeB except the synchronous Home eNodeB of request.

Described Home eNodeB management system can be according to following formula deviation computing time mean value:

$T_{\mathrm{offset}\_2}=\frac{1}{M}\underset{i=1}{\overset{M}{\mathrm{\Σ}}}{T}_{\mathrm{offset}\_2}^i$

Wherein, T _{offset_2}for time deviation mean value, M is synchronous Home eNodeB and the group number of other Home eNodeB reception sync message S times of its place service area of request that Home eNodeB management system is chosen.

Before step 1), can comprise the following steps:

01), request Home eNodeB power-up initializing, initialization inner mark variable exist is no;

02), asking Home eNodeB to initiate Inform asks, sends request Home eNodeB numbering ID and IP address information to Home eNodeB management system, access to home control system request;

03) if Home eNodeB management system is found request, Home eNodeB is illegal, the access of Home eNodeB management system refusal; Otherwise, returning and succeed in registration, request Home eNodeB is received the information of succeeding in registration.

The present invention proposes one and finds nearby with reference to master clock, to realize the method for the time synchronized between Home eNodeB in regional area.Its advantage is, according to the requirement of Home eNodeB synchronous condition, in conjunction with the feature of broadband metropolitan area network network transmission, mode multicast sync message S with segmentation service district gives each service area, has greatly avoided due to the impact of broadband metropolitan area network propagation delay time on the timing tracking accuracy between each Home eNodeB in service area.Simultaneously, due to often Existential Space isolation (as between building, between residential quarter) between service area, can make the phase mutual interference between the adjacent Home eNodeB of different service areas ignore, make Home eNodeB user during with closed pattern access network, synchronous without adopting IEEE1588v2 to realize the whole network.

The present invention also provides time synchronized device for carrying out said between a kind of Home eNodeB, comprising:

Whether Home eNodeB storage device, there is master clock flag information for storing place service area;

Device is sent in Home eNodeB packet sending and receiving, initiates synchronization request and receives the multicast message time to Home eNodeB management system feedback for Home eNodeB, can send Home eNodeB and apply for the message of master clock; Also comprise the receiving function of Home eNodeB management system sync message and time deviation message;

Home eNodeB clock adjustment device, for the adjustment of Home eNodeB time;

Home eNodeB management system and storage device, calculate with storage whether have master clock flag information for Home eNodeB time deviation;

Home eNodeB management system packet sending and receiving device, for Home eNodeB management system multicast sync message be handed down to the time deviation message of Home eNodeB, can send Home eNodeB place service area and whether exist the feedback message of master clock; Comprise the receiving function of the synchronous and feedback time message of Home eNodeB request, and Home eNodeB is applied for the receiving function of master clock message simultaneously.

Brief description of the drawings

Fig. 1 is Home eNodeB differentiated services schematic diagram.

Fig. 2 is Home eNodeB time synchronized flow chart.

Fig. 3 is contrive equipment composition schematic diagram.

Embodiment

Below in conjunction with accompanying drawing, further set forth technical scheme of the present invention.

As shown in Figure 1, suppose that there are three Home eNodeB service areas on this ground, has several Home eNodeB in each service area.Home eNodeB in each service area has same customer access equipment.The explanation as an example of Home eNodeB H1 example below, concrete steps as shown in Figure 2.

(1) at No. 1 service area, now Home eNodeB H1 is to the initialization of HMS request registration, and Home eNodeB H1, after receiving and succeeding in registration, reports its IP and port information thereof to HMS immediately.HMS detects that described Home eNodeB H1 should belong to service area No. 1, i.e. Home eNodeB H1 merger enters service area No. 1.It is no that mark own variable exist is set.

(2) enter request synchronous phase.HMS, according to positional informations such as the IP of Home eNodeB H1, inquires about No. 1 service area whether the Home eNodeB providing with reference to master clock has been provided.

1) if having existed, No. 1 service area of HMS discovery provides the Home eNodeB of master clock H2;

1. Home eNodeB H1 arranges and indicates that own variable exist is true.

2. Home eNodeB H1 is to HMS triggering synchronous request message.

3. HMS receives synchronization request, and after confirming that Home eNodeB H1 is legitimate base station, every 200 milliseconds of multicast sync message S.

4. Home eNodeB H1 and Home eNodeB H2 record the message S time of advent with and fed back to HMS.

5. HMS deviate computing time:

$T_{\mathrm{offset}\_1}^i=T_{\mathrm{req}}^i-T_m^i---\left(4\right)$

Collect after 10 deviates when family's base station management system, get its mean value, that is:

$T_{\mathrm{offset}\_1}=\frac{1}{M}\underset{i=1}{\overset{M}{\mathrm{\Σ}}}{T}_{\mathrm{offset}\_1}^i---\left(5\right)$

6. HMS is again time deviation value T _{offset_1}be handed down to Home eNodeB H1.

7. Home eNodeB H1 is according to time deviation value T _{offset_1}adjust self clock.

2) ask No. 1 service area at synchronous Home eNodeB H1 place not exist with reference to master clock, Home eNodeB H1 starts to be switched to UE pattern, intercepts and whether has macro base station around;

If 1. there is macro base station M, Home eNodeB H1 obtains master sync signal and the auxiliary synchronous signals of macro base station M, completes initial synchronisation.After this, Home eNodeB H1 will service area provides with reference to master clock for No. 1, and Home eNodeB management system issues a change exist variable for really notifying to other Home eNodeB of affiliated service area.In order to prevent the clock crystal oscillator time migration causing of drifting about, Home eNodeB H1 every 2 seconds just and macro base station re-synchronization once.

If 2. Home eNodeB H1 intercepts less than macro base station signal, Home eNodeB H1 triggers the every 200 milliseconds of multicast sync message S of HMS.Home eNodeB H1 record receives the message S time and in No. 1 service area, other Home eNodeB record time of reception equally be in service area except Home eNodeB H1 the time of reception of other Home eNodeB sync message S.Each Home eNodeB feeds back to HMS time of reception, and the time deviation of being calculated Home eNodeB H1 by HMS is:

$T_{\mathrm{offset}\_2}^i=\frac{1}{N}\underset{\mathrm{other}\_j=1}{\overset{N}{\mathrm{\Σ}}}(T_{\mathrm{req}}^i-T_{\mathrm{other}\_j}^i)---\left(6\right)$

In order to reduce the impact of propagation delay time shake in service area, select 10 groups of time deviation values do on average, that is:

$T_{\mathrm{offset}\_2}=\frac{1}{10}\underset{i=1}{\overset{10}{\mathrm{\Σ}}}{T}_{\mathrm{offset}}^i---\left(7\right)$

Home eNodeB management system is by T _{offset_2}pass to Home eNodeB H1; Home eNodeB H1 is according to T _{offset_2}do time synchronized adjustment.Whether each 2 seconds Home eNodeB detect indexed variable exist value is true, if true, synchronize with the Home eNodeB with reference to master clock, i.e. and step 2); If NO, continue to adjust with the average time of other Home eNodeB of service area.

Foregoing invention method can realize by the device shown in Fig. 3.With reference to Fig. 3, this device comprises Home eNodeB storage device 301, Home eNodeB packet sending and receiving device 302, time deviation mean value calculation and storage device 303, Home eNodeB management system packet sending and receiving device 304, Home eNodeB clock adjustment device 305.Its function and principle are as follows:

Whether Home eNodeB storage device 301 there is master clock for this service area of mark.Device 302 is sent in Home eNodeB packet sending and receiving, initiates synchronization request and receives the multicast message time to Home eNodeB management system feedback for Home eNodeB, can send Home eNodeB and apply for the message of master clock; There is the function that receives Home eNodeB management system sync message and time deviation message.Time deviation mean value calculation and storage device 303 calculate with storage whether have master clock flag information for Home eNodeB time deviation.The packet sending and receiving of Home eNodeB management system send device 304 for Home eNodeB management system multicast sync message be handed down to the time deviation message of Home eNodeB, can send Home eNodeB place service area and whether exist the feedback message of master clock.Meanwhile, there is Home eNodeB request synchronously and the receiving function of feedback time message, and Home eNodeB application is the receiving function of master clock message.Home eNodeB clock adjustment device 305 is for adjusting the time deviation of Home eNodeB.The time deviation mean value that the acquisition of time deviation can issue by Home eNodeB management system, or the time deviation value obtaining by eating dishes without rice or wine.

Consider that Home eNodeB is applied to Indoor environment, and in every solitary building, all wide band access users are generally all connected to same access device (as passageway exchange board, Digital Subscriber Line access and multiplexing device etc.), the present invention realizes the time synchronized between the Home eNodeB under same access device in broadband metropolitan area network with this, meanwhile, utilize the spacing distance between building to form natural interference and insulation.In the situation that whole network equipment is also not exclusively supported IEEE1588v2 agreement, the present invention can be used as a kind of transition method,

Only be specially adapted to the Home eNodeB time synchronized for household internal member's closed access way.

In sum, according to Home eNodeB access characteristic and characteristic distributions, utilize the thought in segmentation service district, as shown in Figure 1, all Home eNodeB under same broadband metropolitan area network access layer equipment are divided into a service area, reduce multinode in return network and forward the impact of the propagation delay time of bringing on timing tracking accuracy, to meet the timing tracking accuracy requirement of closed Home eNodeB user in service area.

Claims (10)

1. an implementation method for time synchronized between Home eNodeB, is characterized in that comprising the following steps:

1), ask synchronous Home eNodeB to send synchronization request;

2), Home eNodeB management system receives after the synchronization request of the synchronous Home eNodeB transmission of request, whether inquiry Home eNodeB place service area the Home eNodeB providing with reference to master clock is provided, if exist, the synchronous Home eNodeB of described request carries out time migration adjustment with this clock with reference to the Home eNodeB of master clock; Otherwise, carry out step 3);

3), ask synchronous Home eNodeB to start UE pattern, intercept and whether have macro base station around, if exist, synchronous by the synchronizing signal deadline of this macro base station of listening detection; Otherwise, carry out step 4);

4), the synchronous Home eNodeB of described request triggers Home eNodeB management system multicast sync message, the time that the synchronous Home eNodeB of described request receives described sync message according to it Home eNodeB place other Home eNodeB of service area of synchronizeing with this request receive the deviant of the time of described sync message and do time migration adjustment.

2. the implementation method of time synchronized between a kind of Home eNodeB according to claim 1, is characterized in that described step 2) specifically comprise the following steps:

21), Home eNodeB management system sends variable exist for really notifying to the synchronous Home eNodeB of request;

22), Home eNodeB management system multicast sync message S gives described Home eNodeB place service area;

23), ask synchronous Home eNodeB and record respectively and feed back its time that receives sync message S to Home eNodeB management system with reference to the Home eNodeB of master clock;

24), Home eNodeB management system is according to the synchronous Home eNodeB of described request and receive time of sync message S with reference to the Home eNodeB of master clock, the time deviation mean value of the synchronous Home eNodeB of computation requests;

25), time deviation mean value is passed to the synchronous Home eNodeB of request by Home eNodeB management system;

26) ask synchronous Home eNodeB to do time synchronized adjustment according to described time deviation mean value;

27), whether be true, if true, turn back to step 22 if detecting exist through fixed cycle Home eNodeB), continue to synchronize with the Home eNodeB with reference to master clock; If NO, Home eNodeB carries out step 3).

3. the implementation method of time synchronized between a kind of Home eNodeB according to claim 2, is characterized in that described Home eNodeB management system is according to following formula deviant computing time:

$T_{\mathrm{offset}\_1}^i=T_{\mathrm{req}}^i-T_m^i$

Wherein, be the subsynchronous message S of i gained time deviation, for asking synchronous Home eNodeB to receive time of the subsynchronous message S of i, for receive the time of the subsynchronous message S of i with reference to the Home eNodeB of master clock.

4. the implementation method of time synchronized between a kind of Home eNodeB according to claim 2, is characterized in that described Home eNodeB management system is according to following formula deviation computing time mean value:

$T_{\mathrm{offset}\_1}=\frac{1}{M}\underset{i=1}{\overset{M}{\mathrm{\Σ}}}{T}_{\mathrm{offset}\_1}^i$

Wherein, T _{offset_1}for time deviation mean value, M is the synchronous Home eNodeB of the request chosen of Home eNodeB management system and the group number that receives sync message S with reference to the Home eNodeB of master clock.

5. the implementation method of time synchronized between a kind of Home eNodeB according to claim 1, is characterized in that described step 3) specifically comprises the following steps:

31), ask synchronous Home eNodeB to obtain the master sync signal (PSS, Primary Synchronization Signal) of macro base station by listening detection, realize time synchronized and coarse frequency is synchronous, complete initial synchronisation;

32), ask synchronous Home eNodeB to obtain auxiliary synchronous signals (SSS, the Secondary Synchronization Signal) signal of macro base station by listening detection, realize smart Frequency Synchronization;

33), ask synchronous Home eNodeB with cycle T _macsynchronous to macro base station, i.e. repeating step 31)～33).

6. the implementation method of time synchronized between a kind of Home eNodeB according to claim 5, characterized by further comprising following steps:

34), complete synchronous after, Home eNodeB sends its ID and IP to Home eNodeB management system, Home eNodeB management system will the synchronous Home eNodeB of request be made as the Home eNodeB of the reference master clock of its place service area; And issue a change exist variable for really notifying to other Home eNodeB of affiliated service area;

35) if Home eNodeB management system detects the Home eNodeB shutdown of service area internal reference master clock place or other reasons to exit network, issuing a change exist variable to other Home eNodeB of affiliated service area is no information.

7. the implementation method of time synchronized between a kind of Home eNodeB according to claim 1, is characterized in that described step 4) specifically comprises the following steps:

41), Home eNodeB management system is to the synchronous Home eNodeB place service area multicast sync message S of request;

42), ask synchronous Home eNodeB to record it to receive the time of sync message S and be sent to Home eNodeB management system, other Home eNodeB records of the synchronous Home eNodeB place service area of described request receive sync message S times and are sent to Home eNodeB management system;

43), Home eNodeB management system receives the time of sync message S and the time of other Home eNodeB reception sync messages of its place service area S, the time deviation value mean value of the synchronous Home eNodeB of computation requests according to the synchronous Home eNodeB of described request;

44), time deviation value mean value is passed to the synchronous Home eNodeB of request by Home eNodeB management system;

45), ask synchronous Home eNodeB to do time synchronized adjustment according to described time deviation value mean value;

46), ask synchronous Home eNodeB every cycle T ' whether be true, if true, synchronize with the Home eNodeB with reference to master clock, i.e. step 2 if detecting indexed variable exist);

Described Home eNodeB management system can be calculated according to following formula the time offset value of the synchronous Home eNodeB of described request:

$T_{\mathrm{offset}\_2}^i=\frac{1}{N}\underset{\mathrm{other}\_j=1}{\overset{N}{\mathrm{\Σ}}}(T_{\mathrm{req}}^i-T_{\mathrm{other}\_j}^i)$

Wherein, be the subsynchronous message S of i gained time deviation value, for asking the time of the i time reception sync message S of synchronous Home eNodeB, for the time of reception of the subsynchronous message S of the synchronous Home eNodeB of described request place service area other Home eNodeB i, N is the quantity of place service area other Home eNodeB except the synchronous Home eNodeB of request.

8. the implementation method of time synchronized between a kind of Home eNodeB according to claim 7, is characterized in that described Home eNodeB management system is according to following formula deviation computing time mean value:

$T_{\mathrm{offset}\_2}=\frac{1}{M}\underset{i=1}{\overset{M}{\mathrm{\Σ}}}{T}_{\mathrm{offset}\_2}^i$

Wherein, T _{offset_2}for time deviation mean value, M is synchronous Home eNodeB and the group number of other Home eNodeB reception sync message S times of its place service area of request that Home eNodeB management system is chosen.

9. according to the implementation method of time synchronized between the arbitrary described a kind of Home eNodeB of claim 1 to 8, it is characterized in that before step 1), further comprising the steps of:

01), request Home eNodeB power-up initializing, initialization inner mark variable exist is no;

02), asking Home eNodeB to initiate Inform asks, sends request Home eNodeB numbering ID and IP address information to Home eNodeB management system, access to home control system request;

03) if Home eNodeB management system is found request, Home eNodeB is illegal, the access of Home eNodeB management system refusal; Otherwise, returning and succeed in registration, request Home eNodeB is received the information of succeeding in registration.

10. the device that between Home eNodeB, time synchronized is implemented, is characterized in that, described device comprises:

Whether Home eNodeB storage device, there is master clock flag information for storing place service area;

Device is sent in Home eNodeB packet sending and receiving, initiates synchronization request and receives the multicast message time to Home eNodeB management system feedback for Home eNodeB, can send Home eNodeB and apply for the message of master clock; Also comprise the receiving function of Home eNodeB management system sync message and time deviation message;

Home eNodeB clock adjustment device, for the adjustment of Home eNodeB time;

Home eNodeB management system and storage device, calculate with storage whether have master clock flag information for Home eNodeB time deviation;

Home eNodeB management system packet sending and receiving device, for Home eNodeB management system multicast sync message be handed down to the time deviation message of Home eNodeB, can send Home eNodeB place service area and whether exist the feedback message of master clock; Comprise the receiving function of the synchronous and feedback time message of Home eNodeB request, and Home eNodeB is applied for the receiving function of master clock message simultaneously.