CN102833719A - Method for acquiring and keeping synchronization of home nodeB - Google Patents

Method for acquiring and keeping synchronization of home nodeB Download PDF

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Publication number
CN102833719A
CN102833719A CN2011101650889A CN201110165088A CN102833719A CN 102833719 A CN102833719 A CN 102833719A CN 2011101650889 A CN2011101650889 A CN 2011101650889A CN 201110165088 A CN201110165088 A CN 201110165088A CN 102833719 A CN102833719 A CN 102833719A
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home enodeb
time
synchronisation source
hnb
synchronous
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CN102833719B (en
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刘立刚
杨旸
徐景
王江
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Shanghai Research Center for Wireless Communications
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Shanghai Research Center for Wireless Communications
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Priority to CN201110165088.9A priority Critical patent/CN102833719B/en
Priority claimed from CN201110165088.9A external-priority patent/CN102833719B/en
Priority to PCT/CN2012/070257 priority patent/WO2012171339A1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/001Synchronization between nodes

Abstract

The invention discloses a method for acquiring and keeping synchronization of home nodeB. The method comprises the following steps: step 1, a home nodeB HNBi creates and maintains a neighbor node list, and initiates the parameters of each neighbor node; step 2, the home nodeB HNBi periodically selects a neighbor node NodeBj as a synchronization source; step 3, the home nodeB HNBi judges the synchronization type required to be executed with the synchronization source NodeBj; if the synchronization frequency Nj is equal to zero, then the home nodeB HNBi and the synchronization source NodeBj perform a complete synchronization process, and the synchronization time tij of the synchronization source NodeBj is obtained; if the synchronization frequency Nj is greater than zero, then the home nodeB HNBi and the synchronization source NodeBj perform a quick synchronization process, and the synchronization time tij of the synchronization source NodeBj is obtained; and step 4, the home nodeB HNBi updates own synchronization time ti and amends the synchronization frequency Nj. In the method for acquiring and keeping synchronization of the home nodeB, little resource is occupied, the speed is high, central node control is not needed, and the capability of self-organization and self-optimization is available.

Description

Synchronous obtaining and the maintenance method between a kind of Home eNodeB
Technical field
The invention belongs to the mobile communication network technology field, relate to synchronous obtaining and the maintenance method between a kind of Home eNodeB.
Background technology
(Home NodeB, the HNB) femtocell (Femtocell) that is otherwise known as is a kind of small-sized cellular basestation to Home eNodeB.Generally use in the indoor or small-business mechanism, mainly be used for improving the indoor covering and the shunting high-speed data flow of wireless signal, to improve the capacity of grand network in family.
TD-SCDMA is a kind of time-multiplexed synchronization CDMA technology, and is very high to synchronous requirement.Home eNodeB is as a kind of NodeB class, also must carry out between the Home eNodeB synchronously.If between Home eNodeB and the macro base station or asynchronous between the Home eNodeB, can produce serious disturbance.Therefore, the synchronous ten minutes of Home eNodeB is important.Home eNodeB is a kind of ustomer premises access equipment, has that quantity is huge, plug and play, position and the characteristics such as arbitrariness that power on, can't carry out unified planning and optimization to it by conventional method, and stationary problem has also been proposed very high requirement.
HNB can realize through the wireless signal of intercepting neighbor base station synchronously.In the TD-SCDMA system, defined special frame structure and realized synchronously.As shown in Figure 1, be a sub-frame with 5ms, each subframe comprises 7 business time-slots, and (TS0~TS6) and 3 special time slots are respectively descending pilot frequency time slot (DwPTS), protection time slot (GP) and uplink pilot time slot (UpPTS).Business time-slot comprises the intermediate code of two data fields and one 144 chip, and intermediate code is carried out Multiuser Detection as training sequence, and keeps providing detection reference for uplink synchronous.Descending pilot frequency time slot DwPTS is used for down-going synchronous and cell initial search, constitutes duration 75us at interval by the descending synchronous code of 64 chips and the protection of 32 chips.Protection time slot GP is used for the protection of downstream-to-upstream conversion.When Cell searching, guarantee the DwPTS reliable reception, prevent to disturb uplink pilot time slot work; Guarantee that when inserting at random UpPTS can launch to prevent that DwPTS is produced interference in advance.Uplink pilot time slot UpPTS is used to set up up initial synchronisation and inserts at random, comprises the protection interval of the uplink synchronous code and 32 chips of 128 chips.
Air interface synchronization between the Home eNodeB is meant that the zero-time of radio frames of Home eNodeB and synchronisation source (can be macro base station, also can be other Home eNodeB) is identical, particularly, makes their zero-time of DwPTS time slot identical.As shown in Figure 1, synchronisation source NodeB jIn the zero-time of descending pilot frequency time slot DwPTS be t 0, since propagation delay time, HNB iThe zero-time that listens to the DwPTS time slot is t 0Postponed d jTime t afterwards 1, d wherein jBe HNB iWith NodeB jBetween propagation delay time.In order to make HNB iWith NodeB jKeep synchronously HNB iNodeB should listened to jDwPTS time slots t 1The basis on, oneself the zero-time of DwPTS is shifted to an earlier date d j, i.e. t 0Constantly.Like this, HNB iWith NodeB jThe zero-time of frame identical, realized HNB iWith NodeB jBetween synchronously.Therefore, the key of air interface synchronization is the propagation delay time d that measures between two nodes jIn order to achieve this end Home eNodeB HNB iAt first with synchronisation source NodeB jSet up down-going synchronous, the UE that disguises oneself as then is to synchronisation source NodeB jInitiate " vacation " random access procedure and obtain propagation delay time.Existing Home eNodeB HNB iWith synchronisation source NodeB jThe process (abbreviating complete synchronizing process as) of carrying out air interface synchronization comprises the steps:
1) Home eNodeB HNB iSearch synchronisation source NodeB in the time of a sub-frame jThe descending synchronous code that sends is confirmed the descending synchronous code of sub-district use and the zero-time t of descending pilot frequency time slot j, set up down-going synchronous;
2) Home eNodeB HNB iConfirm NodeB jThe Midamble sign indicating number that uses, scrambler etc., the locking down-going synchronous;
3) Home eNodeB HNB iWith NodeB jSet up the synchronous of Primary Common Control Physical Channel, the control multi-frame is synchronous, reads cell broadcast information at the BCH channel;
4) Home eNodeB HNB iSelect available uplink synchronous code at random, send this sign indicating number at uplink pilot time slot.In ensuing 4 sub-frame, check NodeB jThe FPACH response of sending estimates HNB according to the relevant information in the response iWith synchronisation source NodeB jBetween propagation delay time d j
5) Home eNodeB HNB iAccording to t jAnd d jThe zero-time of adjustment descending pilot frequency time slot is accomplished and NodeB jSynchronously.
The defective of the method is: need take more system resources, and consuming time also long.And, for keep between Home eNodeB and the synchronisation source synchronously, need periodically carry out this process.If the use said process, the more resource that can waste Home eNodeB reduces the ability that provides professional.In the TD-SCDMA system, the maintenance of UE uplink synchronous is in communication process, to utilize the midamble of data transmission channel to carry out.But, do not have direct data transmission channel between Home eNodeB and the synchronisation source, so the control that can't use the mode of midamble to keep synchronously.In addition, another deficiency of said air interface synchronization process is that Home eNodeB only carries out synchronously with a neighbors, at this moment nonsynchronous situation between existence and other neighborss.
Summary of the invention
Technical problem to be solved by this invention is: synchronous obtaining and the maintenance method between a kind of Home eNodeB is provided, and this method makes Home eNodeB pass through air interface and realizes also keeping synchronously synchronously.
Synchronous obtaining and the maintenance method between a kind of Home eNodeB may further comprise the steps:
Step S1, Home eNodeB HNB jSet up and safeguard neighbor node table, the parameter of each neighbors of initialization;
Step S2, Home eNodeB HNB iPeriodically select a neighbors NodeB jAs synchronisation source;
Step S3, Home eNodeB HNB iJudge and synchronisation source NodeB jThe wheel synchronization type that needs execution; If synchronization times N jEqual 0, Home eNodeB HNB iWith synchronisation source NodeB jCarry out complete synchronizing process, obtain synchronisation source NodeB jT lock in time IjIf synchronization times N jGreater than 0, Home eNodeB HNB iWith synchronisation source NodeB jCarry out quick synchronizing process, obtain synchronisation source NodeB jT lock in time Ij
Step S4, Home eNodeB HNB iUpgrade t lock in time of oneself i, and revise synchronization times N j, rotate back into business model then.
As a kind of preferred version of the present invention, the parameter of said neighbors comprises synchronization times N jAmong the step S1, the synchronization times N of all neighborss jBe initialized as 0; Said neighbors is Home eNodeB or macro base station.
As another kind of preferred version of the present invention, among the step S2, said synchronisation source is randomly or uses the mode of poll from neighbors, to select.
As another preferred version of the present invention, among the step S3, said complete synchronizing process is:
S31) Home eNodeB HNB iSearch synchronisation source NodeB in the time of a sub-frame jThe descending synchronous code that sends is confirmed the descending synchronous code of sub-district use and the zero-time t of descending pilot frequency time slot j, set up down-going synchronous;
S32) Home eNodeB HNB iConfirm synchronisation source NodeB jThe coding that uses, the locking down-going synchronous;
S33) Home eNodeB HNB iWith synchronisation source NodeB jSet up the synchronous of Primary Common Control Physical Channel, the control multi-frame is synchronous, reads cell broadcast information at the BCH channel;
S34) Home eNodeB HNB iSelect available uplink synchronous code at random, send said uplink synchronous code at uplink pilot time slot; In ensuing 4 sub-frame, check synchronisation source NodeB then jThe FPACH response of sending estimates Home eNodeB HNB according to the relevant information in the FPACH response iWith synchronisation source NodeB jBetween propagation delay time d j, and preserve d j
S35) Home eNodeB HNB iConfirm synchronisation source NodeB jT lock in time Ij=t j-d j
As this another preferred version, among the step S3, said quick synchronizing process comprises the steps:
S31 ') Home eNodeB HNB iSearch synchronisation source NodeB in the time of a sub-frame jThe descending synchronous code that sends is confirmed the zero-time t of descending pilot frequency time slot jHome eNodeB HNB iUtilize step S34) the middle d that preserves jConfirm synchronisation source NodeB jT lock in time Ij=t j-d j
S32 '), postpones the search of 1 frame continued, till detecting if in a sub-frame, do not detect descending synchronous code;
As another preferred version of the present invention, the detailed implementation procedure of step S4 is:
S41) Home eNodeB HNB iAccording to the synchronisation source NodeB of own current lock in time with this synchronizing process acquisition jT lock in time Ij, with t lock in time of following iterative manner renewal oneself i:
t i(k+1)=λt i(k)+(1-λ)t ij(k)
Wherein, t i(k) expression Home eNodeB HNB iCurrent lock in time, t i(k+1) expression Home eNodeB HNB iLock in time after the renewal, t Ij(k) expression Home eNodeB HNB iWith synchronisation source NodeB jThe lock in time that this synchronizing process obtains, λ is a parameters optimization, 0<λ<1;
S42) synchronization times N jAdd 1; If N j>N MaxExplain that then quick synchronization times has reached the upper limit, need carry out complete synchronizing process again next time, reset N jEqual zero; Wherein, N MaxMaximum for the quick synchronization times set;
S43) Home eNodeB HNB iFrom the Synchronous Processing mode shifts to business model;
S44) return step S2 and get into next synchronizing cycle.
Beneficial effect of the present invention is: synchronous obtaining takies with the maintenance method that resource is few, speed is fast between Home eNodeB of the present invention, need not Centroid control, has the ability of self-organizing, self-optimizing.
Description of drawings
Fig. 1 is the frame structure transmission sketch map in the Home eNodeB;
Fig. 2 is the conversion sketch map of the HNB of family in 3 mode of operations;
Fig. 3 is synchronous obtaining and the schematic flow sheet that keeps method between Home eNodeB of the present invention.
Embodiment
Technical problem to be solved by this invention is: 1) Home eNodeB air interface synchronization and maintenance process synchronously take that resource is many, the problem of length consuming time; 2) only and synchronisation source carries out existing when synchronous and other adjacent base station between nonsynchronous problem.
The invention discloses synchronous obtaining and the maintenance method between a kind of Home eNodeB, this method is used the resource of a kind of quick synchronizing process to take in minimizing Home eNodeB air interface synchronization and the maintenance process synchronously, and shortens the consuming time of synchronizing process; Home eNodeB in this method and neighbors carry out air interface synchronization, use a kind of mode of iteration to upgrade the lock in time of oneself then.The influencing each other of Home eNodeB, cooperation realizes all Home eNodeB synchronous of Home eNodeB region down each other.
Do further explain below in conjunction with the accompanying drawing specific embodiments of the invention.
Embodiment one
Home eNodeB is a type of base station, service is provided for affiliated UE.The DwPTS time slot of ordinary base station only is used for sending descending synchronous code, and the UpPTS time slot only is used for receiving uplink synchronous code.And in order to satisfy the requirement of air interface synchronization, Home eNodeB must suspend when carrying out air interface synchronization to UE provides professional.As, receive and detect NodeB at DwPTS jDuring the descending synchronous code that sends, suspend the descending synchronous code that sends oneself at the DwPTS time slot; At the UpPTS time slot to NodeB jWhen sending uplink synchronous code, the uplink synchronous code that UE sends under can't receiving.
For this reason, define following three kinds of mode of operations for the Home eNodeB that carries out air interface synchronization:
1, business model: HNB is that affiliated UE provides normal business; HNB will send descending synchronous code to affiliated UE at the DwPTS time slot, the uplink synchronous of UE under the UpPTS time slot receives and handles, and it is professional to handle conventional NodeB at business time-slot.
2, complete Synchronous Processing pattern: HNB sends uplink synchronous code at the UpPTS time slot to NodeB at the descending synchronous code of DwPTS time slot reception synchronisation source NodeB; HNB can not send at the DwPTS time slot under this pattern, can not receive at the UpPTS time slot.
3, quick Synchronous Processing pattern: HNB receives the descending synchronous code of NodeB at the DwPTS time slot; HNB can not send at the DwPTS time slot under this pattern, but can receive at the UpPTS time slot.
Under above-mentioned two kinds of patterns relevant with Synchronous Processing, affected only is the operation relevant with the UpPTS time slot with the DwPTS time slot, can not influence other business time-slots of HNB.HNB can change in above-mentioned 3 mode of operations as required, and conversion regime is as shown in Figure 2.
The key that Home eNodeB carries out air interface synchronization is to obtain HNB iWith synchronisation source NodeB jBetween propagation delay time d, then according to detected NodeB jThe zero-time t of DwPTS time slot jConfirm HNB iThe zero-time of descending pilot frequency time slot.
Home eNodeB is in case after disposing, the position is fixed basically, and it is constant with the distance between the synchronisation source of selecting, and the propagation delay time d between them also fixes, and perhaps excursion is minimum can ignore.Utilize this characteristics, can adopt a kind of quick synchronizing process to replace complete synchronizing process.The purpose of synchronizing process is to detect the zero-time t of the DwPTS of synchronisation source fast j
Home eNodeB HNB iWith synchronisation source NodeB jCarrying out fast, synchronous process may further comprise the steps:
1) Home eNodeB HNB iIntercept synchronisation source NodeB at DwPTS jDescending synchronous code, confirm this and intercept the zero-time t of the DwPTS of acquisition j
2) according to propagation delay time d that last time, complete synchronizing process was measured jCalculate Home eNodeB HNB iThe tram of DwPTS, adjust Home eNodeB HNB in view of the above iLock in time.
Fast synchronizing process have synchronizing speed fast, take the few advantage of resource.Its deficiency is the variation that can only detect the lock in time of synchronisation source, and can not detect the variation of propagation delay time d.Therefore, Home eNodeB still needs periodically to carry out once complete synchronizing process with synchronisation source, remeasures propagation delay time d.
During realization, Home eNodeB HNB iWith synchronisation source NodeB jNeed to carry out earlier complete synchronizing process; HNB iWith synchronisation source NodeB jThrough maximum N MaxAfter the inferior quick synchronizing process, must carry out once complete synchronizing process and remeasure propagation delay time d j
In order to realize above purpose, Home eNodeB HNB iSet up neighbor node table.Neighbors possibly be a macro base station, also possibly be other Home eNodeB.HNB iBe each neighbors NodeB jMaintenance is used for two synchronous parameters: 1) synchronization times N j2) propagation delay time d jWherein, synchronization times N jRecord and synchronisation source NodeB jCarry out the number of times of synchronizing process; Propagation delay time d jRecord Home eNodeB HNB iWith synchronisation source NodeB jBetween propagation delay time.
Present embodiment provides synchronous obtaining and the maintenance method between a kind of Home eNodeB, and is as shown in Figure 3, and in this method for synchronous, each Home eNodeB all carries out following synchronizing process, cooperate with each other reach between all Home eNodeB synchronously; One of them Home eNodeB HNB iSpecifically may further comprise the steps with the synchronous process of maintenance synchronously:
Step 1, Home eNodeB HNB iSet up and safeguard neighbor node table, each neighbors parameter of initialization.Particularly, all neighbors NodeB jSynchronization times N jBe initialized as 0.
Step 2, Home eNodeB HNB iPeriodically select a neighbors NodeB jAs synchronisation source.Synchronisation source can be selected from neighbors randomly, preferably, can use the mode of poll to select one by one.
Step 3, Home eNodeB HNB iJudge and synchronisation source NodeB jThe wheel synchronization type that needs execution.If N jEqual 0, Home eNodeB HNB is described iWith synchronisation source NodeB jNeed carry out complete synchronizing process.At this moment, Home eNodeB HNB iGet into complete Synchronous Processing pattern, complete synchronizing process below the execution obtains synchronisation source NodeB jT lock in time IjWith propagation delay time d jConcrete implementation procedure comprises the steps:
31) Home eNodeB HNB iSearch synchronisation source NodeB in the time of a sub-frame jThe descending synchronous code that sends is confirmed the descending synchronous code of sub-district use and the zero-time t of DwPTS time slot j, set up down-going synchronous;
32) Home eNodeB HNB iConfirm synchronisation source NodeB jThe Midamble sign indicating number that uses, scrambler etc., the locking down-going synchronous;
33) Home eNodeB HNB iWith synchronisation source NodeB jSet up the synchronous of Primary Common Control Physical Channel, the control multi-frame is synchronous, reads cell broadcast information at the BCH channel;
34) Home eNodeB HNB iSelect available uplink synchronous code at random, send this sign indicating number at the UpPTS time slot.Inspection synchronisation source NodeB in ensuing 4 sub-frame jThe FPACH response of sending estimates Home eNodeB HNB according to the relevant information in the FPACH response iWith synchronisation source NodeB jBetween propagation delay time d j, and preserve d j
35) Home eNodeB HNB iConfirm synchronisation source NodeB jT lock in time Ij=t j-d j
If step 4 is N jGreater than 0, Home eNodeB HNB is described iWith synchronisation source NodeB jNeed to carry out quick synchronizing process.At this moment, HNB iGet into quick Synchronous Processing pattern, quick synchronizing process obtains synchronisation source NodeB below carrying out jT lock in time IjSaid quick synchronizing process comprises the steps:
41) Home eNodeB HNB iSearch synchronisation source NodeB in the time of a sub-frame jThe descending synchronous code that sends is confirmed the zero-time t of DwPTS time slot jHome eNodeB HNB iUtilize step 34) the middle d that preserves jConfirm synchronisation source NodeB jT lock in time Ij=t j-d j
42), postpone the search of 1 frame continued, till detecting if in this subframe, do not detect descending synchronous code.
Step 5, Home eNodeB HNB iUpgrade t lock in time iAnd modification synchronization times N jSpecifically comprise the steps:
51) Home eNodeB HNB iAccording to the current lock in time of oneself and the synchronisation source NodeB of this synchronizing process acquisition jT lock in time Ij, with t lock in time of following iterative manner renewal oneself i:
t i(k+1)=λt i(k)+(1-λ)t ij(k)
T wherein i(k) expression Home eNodeB HNB iCurrent lock in time, t i(k+1) expression Home eNodeB HNB iLock in time after the renewal, t Ij(k) expression Home eNodeB HNB iWith synchronisation source NodeB jThe lock in time that this synchronizing process obtains, λ is a parameters optimization, 0<λ<1;
52) synchronization times N jAdd 1; If N j>N MaxExplain that then quick synchronization times has reached the upper limit, need carry out complete synchronizing process again next time, reset N jEqual zero; N MaxMaximum for the quick synchronization times set;
53) Home eNodeB HNB jFrom the Synchronous Processing mode shifts to business model;
54) return step 2 and get into next synchronizing cycle.
A kind of quick synchronizing process has been adopted in synchronous obtaining with the maintenance method between Home eNodeB of the present invention; Each Home eNodeB periodically carries out synchronously with selected synchronisation source; Obtain the lock in time of synchronisation source, use the mode of iteration to upgrade the lock in time of oneself then; Home eNodeB and all neighborss carry out synchronously, influence each other at all neighborss, cooperation has down realized all Home eNodeB synchronous of region each other; This quick synchronizing process has the advantage of the few weak point consuming time of the resource of taking.
Home eNodeB HNB among the present invention iWant and NodeB jCarry out air interface synchronization, need have following function:
1) has and synchronisation source NodeB jSet up the ability of down-going synchronous, promptly receive and detect NodeB at the DwPTS time slot jThe ability of descending synchronous code;
2) have at the UpPTS time slot to synchronisation source NodeB jSend the ability of uplink synchronous code;
3) have and receive and read synchronisation source NodeB jThe ability of the FPACH information of sending.
The present invention realized between the Home eNodeB synchronously.Because the behavior of Home eNodeB has dynamic characteristic, the situation that the Home eNodeB of Chang Youxin adds or certain Home eNodeB is closed, in order to keep synchronously, the Home eNodeB maintenance is also upgraded neighbor node table.The present invention adopt the mode of multipoint cooperative realize between Home eNodeB and the macro base station (or other Home eNodeB) synchronously.Through intercepting the wireless signal of synchronisation source, Home eNodeB obtains the corresponding synchronous time from synchronisation source, confirms the lock in time of Home eNodeB then.Compare the method for single synchronisation source; The method synchronization accuracy height that multipoint cooperative of the present invention is synchronous; And it is more stable synchronously; Receive the influence of single synchronisation source synchronous error less, the bigger situation of synchronous error that can avoid reason such as synchronizing channel quality fluctuation, synchronisation source self bad timing to cause because of single synchronisation source.In addition, the present invention adopts distributed method to solve the node synchronization challenges of Home eNodeB distributed network, need not Centroid control, has the ability of self-organizing, self-optimizing.The present invention is applicable to the Home eNodeB distributed network of TD-SCDMA and the following evolution system of TD-LTE.
Description of the invention and application are illustrative, are not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of the embodiment that is disclosed and change are possible, and the replacement of embodiment is known with the various parts of equivalence for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or substantive characteristics, and the present invention can be with other forms, structure, layout, ratio, and realize with other elements, material and parts.

Claims (6)

1. synchronous obtaining and the maintenance method between a Home eNodeB is characterized in that, may further comprise the steps:
Step S1, Home eNodeB HNB iSet up and safeguard neighbor node table, the parameter of each neighbors of initialization;
Step S2, Home eNodeB HNB iPeriodically select a neighbors NodeB jAs synchronisation source;
Step S3, Home eNodeB HNB iJudge and synchronisation source NodeB jThe wheel synchronization type that needs execution; If synchronization times N jEqual 0, Home eNodeB HNB iWith synchronisation source NodeB jCarry out complete synchronizing process, obtain synchronisation source NodeB jT lock in time IjIf synchronization times N jGreater than 0, Home eNodeB HNB iWith synchronisation source NodeB jCarry out quick synchronizing process, obtain synchronisation source NodeB jT lock in time Ij
Step S4, Home eNodeB HNB iUpgrade t lock in time of oneself i, and revise synchronization times N j, rotate back into business model then.
2. synchronous obtaining and the maintenance method between Home eNodeB according to claim 1, it is characterized in that: the parameter of said neighbors comprises synchronization times N jAmong the step S1, the synchronization times N of all neighborss jBe initialized as 0; Said neighbors is Home eNodeB or macro base station.
3. synchronous obtaining and the maintenance method between Home eNodeB according to claim 1 is characterized in that: among the step S2, said synchronisation source is randomly or uses the mode of poll from neighbors, to select.
4. synchronous obtaining and the maintenance method is characterized in that between Home eNodeB according to claim 1, and among the step S3, said complete synchronizing process is:
S31) Home eNodeB HNB iSearch synchronisation source NodeB in the time of a sub-frame jThe descending synchronous code that sends is confirmed the descending synchronous code of sub-district use and the zero-time t of descending pilot frequency time slot j, set up down-going synchronous;
S32) Home eNodeB HNB iConfirm synchronisation source NodeB jThe coding that uses, the locking down-going synchronous;
S33) Home eNodeB HNB iWith synchronisation source NodeB jSet up the synchronous of Primary Common Control Physical Channel, the control multi-frame is synchronous, reads cell broadcast information at the BCH channel;
S34) Home eNodeB HNB iSelect available uplink synchronous code at random, send said uplink synchronous code at uplink pilot time slot; In ensuing 4 sub-frame, check synchronisation source NodeB then jThe FPACH response of sending estimates Home eNodeB HNB according to the relevant information in the FPACH response iWith synchronisation source NodeB jBetween propagation delay time d j, and preserve d j
S35) Home eNodeB HNB iConfirm synchronisation source NodeB jT lock in time Ij=t j-d j
5. synchronous obtaining and the maintenance method is characterized in that between Home eNodeB according to claim 4, and among the step S3, said quick synchronizing process comprises the steps:
S31 ') Home eNodeB HNB iSearch synchronisation source NodeB in the time of a sub-frame jThe descending synchronous code that sends is confirmed the zero-time t of descending pilot frequency time slot j, Home eNodeB HNB iUtilize step S34) the middle d that preserves jConfirm synchronisation source NodeB jT lock in time Ij=t j-d j
S32 '), postpones the search of 1 frame continued, till detecting if in a sub-frame, do not detect descending synchronous code.
6. synchronous obtaining and the maintenance method is characterized in that between Home eNodeB according to claim 1, and the detailed implementation procedure of step S4 is:
S41) Home eNodeB HNB iAccording to the synchronisation source NodeB of own current lock in time with this synchronizing process acquisition jT lock in time Ij, with t lock in time of following iterative manner renewal oneself i:
t i(k+1)=λt i(k)+(1-λ)t ij(k)
Wherein, t i(k) expression Home eNodeB HNB iCurrent lock in time, t i(k+1) expression Home eNodeB HNB iLock in time after the renewal, t Ij(k) expression Home eNodeB HNB iWith synchronisation source NodeB jThe lock in time that this synchronizing process obtains, λ is a parameters optimization, 0<λ<1;
S42) synchronization times N jAdd 1; If N j>N MaxExplain that then quick synchronization times has reached the upper limit, need carry out complete synchronizing process again next time, reset N jEqual zero; Wherein, N MaxMaximum for the quick synchronization times set;
S43) Home eNodeB HNB jFrom the Synchronous Processing mode shifts to business model;
S44) return step S2 and get into next synchronizing cycle.
CN201110165088.9A 2011-06-17 2011-06-17 The acquisition synchronized between a kind of Home eNodeB and keeping method Expired - Fee Related CN102833719B (en)

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