CN1728869A - Switch synchronization method for asynchronous CDMA system - Google Patents
Switch synchronization method for asynchronous CDMA system Download PDFInfo
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- CN1728869A CN1728869A CNA2004100548614A CN200410054861A CN1728869A CN 1728869 A CN1728869 A CN 1728869A CN A2004100548614 A CNA2004100548614 A CN A2004100548614A CN 200410054861 A CN200410054861 A CN 200410054861A CN 1728869 A CN1728869 A CN 1728869A
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Abstract
Using matrix list of time difference and timestamp between Tcell matrix list in NodeB and NodeB stored in each local memory of RNC, the invention saves relative synchronization information. Thus, when there is no synchronization information reported from UE, switch synchronization can be carried out by using saved information. The invention guarantees switching success ratio and switching performance.
Description
Technical field
The present invention relates to the communications field, particularly the handoff technique of Asynchronous Code Division Multiple Access system.
Background technology
Increasingly mature along with technology, the practical application foreground of 3G (Third Generation) Moblie business is within sight.It and second generation mobile communications network have similar network configuration, and they all can be divided into wireless access network (Radio Access Network is called for short " RAN ") and core network (Core Network is called for short " CN ") two parts.
Wherein, RAN mainly is made up of travelling carriage (Mobile Station is called for short " MS "), Node B (NodeB) and radio network controller (Radio Network Controller is called for short " RNC ").In mobile communication system, NodeB is called the base station again, and each NodeB covers certain zone, and diameter does not wait from tens meters to tens kilometers, and it is responsible for the access of mobile phone signal in this zone.RNC then is used to control several NodeB, generally from tens to up to a hundred.
In above-mentioned mobile communication system,, make that the radio-frequency power of NodeB is confined within the scope of a sub-district in the system for the utilance that improves frequency spectrum resource and the capacity of whole system.Enter the another one sub-district when MS leaves a sub-district, the signal of the original sub-district that this MS is received inevitable more and more a little less than, and its received signal that enters the sub-district will be more and more stronger just also.In order to keep the communication quality of MS, must carry out the continuing of this MS promptly switched to the stronger base station of signal that newly enters by original base station the notion of switching in Here it is the cell mobile communication systems.
In the handoff techniques of mobile communication, the branch of direct-cut operation and soft handover is arranged.Direct-cut operation is meant that MS interrupts earlier and the getting in touch of former NodeB, and is connected with new NodeB again, and said process is easy to generate call drop.And soft handover, the busy MS of making of NodeB traffic that is moved or communicates by letter with MS at present as MS is meant when need communicate by letter with a new NodeB, elder generation's interruption and former NodeB's gets in touch, but earlier and after new NodeB is connected, interruption and former NodeB's gets in touch again, this is classical code division multiple access (Code Division Multiple Access is called for short " CDMA ") technology.Above-mentioned soft hand-off has raising speech quality, reduces advantages such as call drop.
In mobile communication system, handover is controlled by following three kinds of modes, that is: (MCHO) switched in travelling carriage control, (NCHO) and Mobile Assisted Handover (MAHO) are switched in network control.
Below these three kinds of modes are done and are briefly introduced:
MCHO is that when satisfying switching condition, MS selects a best handoff candidate item and sends handoff request by MS persistent surveillance the base station signal strength signal intensity and the quality of (Base Station is called for short " BS ").The digitally enhanced wireless technology (DECT) in Europe and the Pacific Area Communication System (PACS) of North America all adopt this switching controls at present.
NCHO is by BS supervisory signal intensity and quality, when signal degradation when being lower than certain threshold value, network just arranges to switch to new BS.In this process, all BS of network requirement monitor by the next signal of travelling carriage, and report the network of knotting with the result.Behind the new BS of network selecting, it notifies new, old BS to finish switching simultaneously, and MS is passive in handoff procedure.Present TACS and AMPS system all adopt this switching controls.
MAHO can be described as a kind of evolution of NCHO, and which port is the signal strength signal intensity of BS and report to old BS around network requirement MS measures judge whether to switch and switch to by network then.Therefore MAHO measures communication link by MS, and is switched by network control, and MS and network participate in switching simultaneously in handoff procedure, and MS is responsible for measurement, and network is responsible for judgement, and present GSM and cdma system all adopt this switching controls.
When carry out handoff techniques in order to judge, all adopt in the cdma communication system special pilot channel come identifying cells coverage, phase reference etc. is provided.The judgement of soft handover is based on MS to the measurement of pilot frequency channel signal.Network terminal to the travelling carriage configured threshold, monitors when the pilot signal quality that collects the sub-district is higher than thresholding when subscriber equipment (User Equipment is called for short " UE ") detects then report network terminal, whether initiate soft handover by the RNC decision this moment again by signaling.
In existing Asynchronous Code Division Multiple Access system, RNC and NodeB do not share common time reference, and therefore, the moment that they transmit is arbitrarily, not predetermined each other synchronously.In order to make the asynchronous system in minizone normally carry out soft handover, the MS that switch must be in the reception sources cell signal can the receiving target sub-district signal, to reduce requirement to buffer capacity.MS calculates time difference between Target cell and the cell-of-origin or Target cell x time poor with it, and report to network, network is told target BS by RNC with this time difference, so just adjusting, target BS transmits and receives the moment that signal is given relevant MS, to compensate this time difference, realize synchronously.
In actual applications, there is following problem in such scheme: in the operation of current real network because UE do not detect frame head, because of rather than each UE can both measure the situation of Target cell synchronizing information, cause synchronous failure.Synchronous failure causes a main cause of handoff failure just in handoff procedure.Because in the soft switching process,, can cause to trigger soft handover if lack the Target cell synchronizing information; And in the alien frequencies direct-cut operation, if there is not the Target cell synchronizing information, the alien frequencies direct-cut operation can only carry out the asynchronous direct-cut operation that performance is worse than synchronous direct-cut operation.Therefore, how to be that the correct synchronization parameter of UE and NodeB configuration is for guaranteeing that handover success rate is very important, especially for the Asynchronous Code Division Multiple Access system during switching.
Whether the synchronizing information of Target cell is measured by RNC is controlled, with Wideband Code Division Multiple Access (WCDMA) (WidebandCode Division Multiple Access, being called for short " WCDMA ") system is that example: RNC is when issuing common frequency measurement and different-frequency measure control, measure the neighbor cell list that has comprised the current area that requires the UE measurement in the control messages, these neighbor cell lists are that the network planning is configured in the RNC local data base, and the cell synchronization information in the measurement target cell report amount is reported indication parameter (Cellsynchronisation information reporting indicator) be set to True, require to measure and report the synchronizing information of Target cell.Common frequency measurement can report synchronizing information according to synchronous Warning Mark position substantially, but as mentioned above, also has the possibility that can not report synchronizing information; Alien frequencies can not report synchronizing information substantially, because have only double-receiver UE just may report synchronizing information, and single-receiver needs to start compact model, but under compact model, can't read the System Frame Number (System Frame Number is called for short " SFN ") of alien-frequency district.
Cause the main cause of this situation to be, but the synchronizing information situation of UE energy measurement fall short sub-district.
Summary of the invention
In view of this, main purpose of the present invention is to provide the switching method for synchronous of a kind of Asynchronous Code Division Multiple Access system, makes even without the synchronizing information of Target cell, still can switch, thereby guarantee the performance of success rate for switching and switching.
For achieving the above object, the invention provides the switching method for synchronous of a kind of Asynchronous Code Division Multiple Access system, comprise following steps:
Synchronization parameter between each base station cell of A moving table measuring, and described synchronization parameter is reported radio network controller by measurement report, calculate the base station time difference information by described radio network controller according to described synchronization parameter, and preserve;
When B need switch when travelling carriage, described radio network controller obtained the Target cell that is saved and the base station time difference information of cell-of-origin, and according to described base station time difference information, the synchronization parameter of configuration Target cell;
C carries out the sub-district according to described synchronization parameter and switches.
Wherein, in the described steps A, described synchronization parameter is that described Target cell System Frame Number is deducted the observed time difference information that obtains behind the travelling carriage x time Connection Frame Number; Or
Described Target cell System Frame Number is deducted the observed time difference information that obtains behind the System Frame Number of cell-of-origin.
In described steps A, the measurement report that also comprises according to described travelling carriage upgrades time difference information between the base station, stamps timestamp, and is recorded in the step in the described radio network controller.
In described steps A, time difference information is stored in second table of the Matrix List that is used for writing down time difference information and timestamp between the base station in the described radio network controller local storage, and,
Described second table can upgrade continuously by the measurement report of receiving from described travelling carriage;
Time difference in described second table between same base is constant to be zero; And
Also comprise first table that is used for writing down each sub-district, base station constant time lag Matrix List in the described local storage, when described first table is set up in the sub-district by described wireless network controller updates.
When described time difference information is a described Target cell System Frame Number when deducting the cell-of-origin System Frame Number and obtaining observed time difference information, in the step of upgrading described second table by measurement report continuously, also comprise following substep from described travelling carriage:
Described moving table measuring deducts cell-of-origin System Frame Number observed time difference information to described Target cell System Frame Number;
When described Target cell and cell-of-origin can be switched, according to the relation between B node frame number and the System Frame Number, calculate time difference information between base station, place, described two sub-districts, stamp timestamp, and in view of the above described second table is upgraded.
Calculate time difference information between base station, place, described two sub-districts according to following mode:
(B node frame number) i-(B node frame number) k
=[(System Frame Number) ij-System Frame Number) ks]+[((sub-district constant time lag) ij-(sub-district constant time lag) ks]
Wherein,
I represents base station, Target cell place, and j represents Target cell;
K represents base station, place, cell-of-origin, and s represents the cell-of-origin.
When described time difference information is a described Target cell System Frame Number when deducting travelling carriage x time Connection Frame Number observed time difference, in the step of upgrading described second table by measurement report continuously, also comprise following substep from described travelling carriage:
Moving table measuring deducts travelling carriage x time Connection Frame Number to the Target cell System Frame Number;
When described Target cell and cell-of-origin can be switched, according to the relation between System Frame Number and the travelling carriage x time Connection Frame Number, calculate time difference information between Target cell and base station, place, cell-of-origin, stamp timestamp, and in view of the above described second table is upgraded.
According to following mode, calculate time difference information between base station, place, described two sub-districts:
(B node frame number) i-(B node frame number) k
=[Δ ij-Δ ks]+[((sub-district constant time lag) ij-(sub-district constant time lag) ks]
Wherein,
I represents base station, Target cell place, and j represents Target cell;
K represents base station, place, cell-of-origin, and s represents the cell-of-origin;
Δ ij=(System Frame Number) ij-travelling carriage x time Connection Frame Number;
Δ ks=System Frame Number ks-travelling carriage x time Connection Frame Number.
Whether can switch according to described two sub-districts of following condition judgment:
When measured described Target cell and cell-of-origin do not belong to same base station cell, and
Described Target cell and cell-of-origin are when distance is less than predetermined value between the antenna of neighbor cell or described Target cell and cell-of-origin,
Described Target cell of then described decidable and cell-of-origin can be switched, otherwise described Target cell and cell-of-origin can not be switched; And,
When described Target cell and cell-of-origin can not be switched then not to base station, place, described two sub-districts between time difference information upgrade processing.
Among the described step B, when travelling carriage needs to switch, and radio network controller is not received the Target cell synchronizing information that travelling carriage records, and when described Target cell and cell-of-origin can be switched, described first table and second table in the local storage of polling of radio network controller, therefrom take out time difference information and corresponding timestamp information and sub-district constant time lag between relevant base station, and, calculate described travelling carriage and switch required synchronization parameter according to the relation of B node frame number and System Frame Number.
When described synchronization parameter is the System Frame Number-System Frame Number of described Target cell and cell-of-origin during the time difference, calculate in the following manner:
(System Frame Number) ij-(System Frame Number) ks=[(B node frame number) i-(B node frame number) k]+[((sub-district constant time lag) ks-(sub-district constant time lag) ij],
Wherein,
I represents base station, Target cell place, and j represents Target cell;
K represents base station, place, cell-of-origin, and s represents the cell-of-origin.
When described synchronization parameter is a described cell-of-origin System Frame Number when deducting the time difference that obtains behind the travelling carriage x time Connection Frame Number, calculate in the following manner:
(System Frame Number) ij-(Connection Frame Number)=[(B node frame number) i-(B node frame number) k]-[((sub-district constant time lag) ij-(sub-district constant time lag) ks]+Δ ks, wherein
Δ ks=(System Frame Number) ks-travelling carriage x time Connection Frame Number; And
I represents base station, Target cell place, and j represents Target cell;
K represents base station, place, cell-of-origin, and s represents the cell-of-origin.
By relatively finding, technical scheme difference with the prior art of the present invention is, the present invention by in the local storage of RNC, all depositing Tcell among each NodeB Matrix List and Node B between the Matrix List of time difference and timestamp, preserve relevant synchronizing information.When UE does not report synchronizing information, still can utilize preservation information to switch synchronously.
Difference on this technical scheme has brought comparatively significantly beneficial effect, even without the synchronizing information of Target cell, still can switch synchronously, has guaranteed the performance of success rate for switching and switching.
Description of drawings
Fig. 1 is the flow chart that the SFN-SFN of the utilization time difference according to an embodiment of the invention refreshes BFN-BFN;
Fig. 2 is the flow chart that the SFN-CFN of the utilization time difference according to an embodiment of the invention refreshes BFN-BFN;
Fig. 3 is the flow chart that switches synchronous method in the Asynchronous Code Division Multiple Access according to an embodiment of the invention system.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Generally speaking, switch synchronous method in the Asynchronous Code Division Multiple Access system proposed by the invention, at first need to preserve the SFN time difference (hereinafter being called " SFN-SFN time difference ") of minizone according to the synchronizing information in the measurement report of UE, then according to same frequency or the different-frequency measure reporting of UE, if there is not synchronizing information, then from the SFN-SFN time difference of the minizone that had, the synchronization parameter of configuration Target cell switches.
In the present invention, except above-mentioned SFN, also relate to following two kinds of frame numbers: NodeB frame number (Node B Frame Number is called for short " BFN ") and Connection Frame Number (Connection FrameNumber is called for short " CFN ").(SCH) overlapping synchronously between the different districts in the same NodeB, SFN is with respect to the BFN sub-district constant time lag value (Tcell) of delaying time the sub-district in.What deserves to be explained is under the NodeB a plurality of sub-districts to be arranged, the Tcell of each sub-district fixes, and is disposed by RNC; In addition, in order to reduce to preserve the data volume of SFN-SFN time difference, can replace the SFN-SFN time difference with the Tcell table of BFN time difference (hereinafter being called " BFN-BFN time difference ") and each NodeB, effect is identical.
Above-mentioned frame number has constituted two synchronization parameters of the present invention: SFN-SFN time difference and SFN-CFN time difference.
For realizing technique effect of the present invention, at first utilize the SFN-CFN time difference or utilize the SFN-SFN time difference to refresh BFN-BFN time difference information between Node B, and stamp timestamp.Reach this purpose, need all deposit the Matrix List of time difference and timestamp between the Matrix List of Tcell among each NodeB and the Node B in the local storage of RNC, the BFN-BFN time difference between the identical Node B is constant to be zero.The tabulation of Tcell is to be upgraded by RNC when setting up in the sub-district.
As mentioned above, the renewal of BFN-BFN time difference information has dual mode, and a kind of is to utilize the SFN-SFN time difference to refresh, and another kind is to utilize the SFN-CFN time difference to refresh.Dual mode all can reach the purpose that refreshes BFN-BFN, and the difference of the measurement observed time difference that will report according to UE in application is selected wherein a kind of mode.
Following elder generation in conjunction with the accompanying drawings 1 illustrates the process of utilizing the SFN-SFN time difference to refresh BFN-BFN.
At first, in step 101, judge whether two sub-districts being surveyed are same NodeB sub-districts.If, then enter step 103, promptly do not upgrade processing because the BFN-BFN time difference between the identical Node B constant be zero; If not, then enter step 102.
In step 102, be configured in local data base according to the network planning, judge that whether two sub-districts being surveyed are whether antenna distance between neighbor cell or two sub-districts is less than certain particular value.If then enter step 104; If not, then enter step 103, promptly do not upgrade processing, because if two sub-districts are non-conterminous or apart from too far away, can not switch basically.
In step 104, utilize the relation between BFN and the SFN, calculate the BFN-BFN time difference information of two sub-districts place NodeB.Detailed process is as follows:
Suppose (BFN) i, (SFN) ij, (Tcell) i represents it is i Node B among the ij, j represents j sub-district.No matter co-frequency cell or alien-frequency district, all BFN and SFN satisfy following relation as can be known:
(SFN)ij＝(BFN)i-(Tcell)ij
(1)
When the observed time difference that measures (SFN) ij-(SFN) ks, the time difference that then can calculate (BFN) i-(BFN) k is
(BFN)i-(BFN)k
＝[(SFN)ij+(Tcell)ij]-[(SFN)ks+(Tcell)ks]
＝[(SFN)ij-SFN]ks]+[((Tcell)ij-(Tcell)ks)
(2)
Can calculate (NodeB) i and (NodeB) time difference information between the k by above-mentioned steps.
Enter step 105 then, stamp timestamp.Thereby finish the process of utilizing the SFN-SFN time difference to refresh BFN-BFN.
Below in conjunction with accompanying drawing 2, the process of utilizing the SFN-CFN time difference to refresh BFN-BFN is described.What deserves to be explained is that the SFN-CFN observed time difference is the poor of Target cell SFN and UE x time CFN, if certain user measures the SFN-CFN time difference information, then carries out following steps:
At first, in step 201, judge whether two sub-districts being surveyed are same NodeB sub-districts.If, then enter step 203, promptly do not upgrade processing because the BFN-BFN time difference between the identical Node B constant be zero; If not, then enter step 202.
In step 202, be configured in local data base according to the network planning, judge that whether two sub-districts being surveyed are whether antenna distance between neighbor cell or two sub-districts is less than certain particular value.If then enter step 204; If not, then enter step 203, promptly do not upgrade processing, because if two sub-districts are non-conterminous or apart from too far away, can not switch basically.
In step 204, utilize the relation between SFN and the CFN, calculate the BFN-BFN time difference information of two sub-districts place NodeB.Detailed process is as follows:
The SFN-CFN observed time difference is defined as Δ ij, and the Δ ij of Target cell is measured by UE, Δ ij=(SFN) ij-CFN; And the Δ ks of cell-of-origin is known according to the requirement of setting up Radio Link, Δ ks=(SFN) ks-CFN.So
(SFN)ij-(SFN)ks＝Δij-Δks
(3)
According to formula (2), can calculate the time difference information between (Node B) i and (Node B) k:
(BFN)i-(BFN)k
＝[(SFN)ij-SFN]ks]+[((Tcell)ij-(Tcell)ks)
＝[Δij-Δks]+[((Tcell)ij-(Tcell)ks)
(4)
Can calculate (NodeB) i and (NodeB) time difference information between the k by above-mentioned steps.
Enter step 205 then, stamp timestamp.Utilize the SFN-CFN time difference to refresh the process of BFN-BFN time difference thereby finish.
How to obtain BFN-BFN after the time difference in explanation, the following describes, utilize the BFN-BFN time difference to realize switching synchronous step according to principle of the present invention.
When UE need switch,, then directly utilize this information to carry out switching timing and handle if can receive the synchronizing information of the Target cell that the UE measurement gets.If can not obtain relative synchronous information, then from the BFN-BFN table, take out corresponding BFN-BFN time difference and subsidiary timestamp information.This timestamp is used to judge whether the BFN-BFN time difference information surpasses the term of validity, if not out of date, then concern difference information computing time according to BFN and SFN, and carries out switching timing and handle.
Below in conjunction with accompanying drawing 3 relevant process is described:
At first, in step 301, UE enters connection status, and RNC generally can issue common frequency measurement control or different-frequency measure and control to UE as required, measures adjacent co-frequency cell or adjacent alien-frequency district, is used for soft handover or alien frequencies direct-cut operation.Then enter step 302.
In step 302, when measurement report satisfied trigger condition, UE can report with frequency or different-frequency measure reporting and give RNC.Enter step 303 then.
In step 303, RNC judges whether comprise synchronizing information in the measurement report.If comprise, then enter step 304; If do not comprise, then enter step 305.
In step 304, will refresh and preserve BFN-BFN time difference and timestamp.The realization of this step has dual mode, and a kind of is to utilize the SFN-SFN time difference, and detailed process refer step 101 is to step 105; Another kind is to utilize the SFN-CFN time difference, and detailed process refer step 201 is to step 205.The difference of the measurement observed time difference that will report according to UE in application is selected wherein a kind of mode.The time difference that UE reports has two kinds as previously mentioned: SFN-SFN time difference and SFN-CFN time difference.
Wherein, the SFN-SFN time difference as the following formula (5) obtain, wherein, (SFN) ij is the SFN of Target cell, (SFN) ks is the SFN of cell-of-origin, then:
(SFN)ij-(SFN)ks
＝[(BFN)i-(Tcell)ij]-[(BFN)k-(Tcell)ks]
＝[(BFN)i-(BFN)k]+[((Tcell)ks-(Tcell)ij)
(5)
And the SFN-CFN time difference as the following formula (6) obtain, suppose that the SFN-CFN observed time difference is defined as Δ ij, Δ ij=(SFN) ij-CFN of Target cell, can release according to formula (4), wherein Δ ks is the SFN-CFN value of cell-of-origin, when the Radio Link of cell-of-origin is set up, dispose, can be kept in the local storage of RNC:
(SFN)ij-CFN
＝Δij
＝[(BFN)i-(BFN)k]-[((Tcell)ij-(Tcell)ks)+Δks
(6)
After refreshing and preserving BFN-BFN time difference and timestamp, will enter step 309.
In step 305, be configured in local data base according to the network planning, judge that whether two sub-districts being surveyed are whether antenna distance between neighbor cell or two sub-districts is less than certain particular value.If then enter step 306; If not, then enter step 307, promptly the acquisition time mistake loses, because if two sub-districts are non-conterminous or apart from too far away, can not switch basically.
In step 306, show and do not comprise synchronizing information in the report this moment, so show and the Tcell table timestamp information that from the BFN-BFN table, takes out the corresponding BFN-BFN time difference and attach in the BFN-BFN time difference that RNC searches local storage.Enter step 308 then.
In step 308, judge whether the BFN-BFN time difference information surpasses the term of validity.If, then enter step 307, show that promptly the acquisition time mistake loses; If not, then enter step 309.
In step 309, synchronization parameter is switched in configuration, enters step 310 then, carries out handoff procedure.
Except above-mentioned method, the present invention also can do following expansion: because the synchronizing information of UE measurement target sub-district, generally can consume the measurement resource of UE, in order to save the measurement resource of UE, reach the purpose of energy-and time-economizing, can choose the part UE that inserts certain sub-district, UE as 20%, the synchronizing information of measurement target sub-district is set in measuring control, and all the other UE are set to not measure the synchronizing information of Target cell.
In sum, in the present invention, RNC receives the measurement report of UE, when handoff request is sent in judgement, and the timing information that preferentially utilizes UE to measure; If UE does not report timing relationship, utilize the synchronized relation configuration of the minizone of network side storing to switch synchronization parameter.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (12)
1. the switching method for synchronous of an Asynchronous Code Division Multiple Access system is characterized in that, comprises following steps:
Synchronization parameter between each base station cell of A moving table measuring, and described synchronization parameter is reported radio network controller by measurement report, calculate the base station time difference information by described radio network controller according to described synchronization parameter, and preserve;
When B need switch when travelling carriage, described radio network controller obtained the Target cell that is saved and the base station time difference information of cell-of-origin, and according to described base station time difference information, the synchronization parameter of configuration Target cell;
C carries out the sub-district according to described synchronization parameter and switches.
2. the switching method for synchronous of Asynchronous Code Division Multiple Access according to claim 1 system, it is characterized in that, in the described steps A, described synchronization parameter is that described Target cell System Frame Number is deducted the observed time difference information that obtains behind the travelling carriage x time Connection Frame Number; Or
Described Target cell System Frame Number is deducted the observed time difference information that obtains behind the System Frame Number of cell-of-origin.
3. the switching method for synchronous of Asynchronous Code Division Multiple Access according to claim 2 system, it is characterized in that in described steps A, the measurement report that also comprises according to described travelling carriage upgrades time difference information between the base station, stamp timestamp, and be recorded in the step in the described radio network controller.
4. the switching method for synchronous of Asynchronous Code Division Multiple Access according to claim 3 system, it is characterized in that, in described steps A, described base station time difference information is stored in second table of the Matrix List that is used for writing down time difference information and timestamp between the base station in the described radio network controller local storage, and
Described second table can upgrade continuously by the measurement report of receiving from described travelling carriage;
Time difference in described second table between same base is constant to be zero; And
Also comprise first table that is used for writing down each sub-district, base station constant time lag Matrix List in the described local storage, when described first table is set up in the sub-district by described wireless network controller updates.
5. the switching method for synchronous of Asynchronous Code Division Multiple Access according to claim 4 system, it is characterized in that, when described time difference information is a described Target cell System Frame Number when deducting the cell-of-origin System Frame Number and obtaining observed time difference information, in the step of upgrading described second table by measurement report continuously, also comprise following substep from described travelling carriage:
Described moving table measuring deducts cell-of-origin System Frame Number observed time difference information to described Target cell System Frame Number;
When described Target cell and cell-of-origin can be switched, according to the relation between B node frame number and the System Frame Number, calculate time difference information between base station, place, described two sub-districts, stamp timestamp, and in view of the above described second table is upgraded.
6. the switching method for synchronous of Asynchronous Code Division Multiple Access according to claim 5 system is characterized in that, calculates time difference information between base station, place, described two sub-districts according to following mode:
(B node frame number) i-(B node frame number) k
=[(System Frame Number) ij-System Frame Number) ks]+[((sub-district constant time lag) ij-(sub-district constant time lag) ks]
Wherein,
I represents base station, Target cell place, and j represents Target cell;
K represents base station, place, cell-of-origin, and s represents the cell-of-origin.
7. the switching method for synchronous of Asynchronous Code Division Multiple Access according to claim 4 system, it is characterized in that, when described time difference information is a described Target cell System Frame Number when deducting the observed time difference that obtains behind the travelling carriage x time Connection Frame Number, in the step of upgrading described second table by measurement report continuously, also comprise following substep from described travelling carriage:
Moving table measuring deducts travelling carriage x time Connection Frame Number to the Target cell System Frame Number;
When described Target cell and cell-of-origin can be switched, according to the relation between System Frame Number and the travelling carriage x time Connection Frame Number, calculate time difference information between Target cell and base station, place, cell-of-origin, stamp timestamp, and in view of the above described second table is upgraded.
8. the switching method for synchronous of Asynchronous Code Division Multiple Access according to claim 7 system is characterized in that, according to following mode, calculates time difference information between base station, place, described two sub-districts:
(B node frame number) i-(B node frame number) k
=[Δ ij-Δ ks]+[((sub-district constant time lag) ij-(sub-district constant time lag) ks]
Wherein,
I represents base station, Target cell place, and j represents Target cell;
K represents base station, place, cell-of-origin, and s represents the cell-of-origin;
Δ ij=(System Frame Number) ij-travelling carriage x time Connection Frame Number;
Δ ks=System Frame Number ks-travelling carriage x time Connection Frame Number.
9. according to the switching method for synchronous of claim 6 or 8 described Asynchronous Code Division Multiple Access systems, it is characterized in that whether can switch according to described two sub-districts of following condition judgment:
When measured described Target cell and cell-of-origin do not belong to same base station cell, and
Described Target cell and cell-of-origin are when distance is less than predetermined value between the antenna of neighbor cell or described Target cell and cell-of-origin,
Described Target cell of then described decidable and cell-of-origin can be switched, otherwise described Target cell and cell-of-origin can not be switched; And,
When described Target cell and cell-of-origin can not be switched not to base station, place, described two sub-districts between time difference information upgrade processing.
10. the switching method for synchronous of Asynchronous Code Division Multiple Access according to claim 9 system, it is characterized in that, in described step B, when travelling carriage needs to switch, and radio network controller is not received the Target cell synchronizing information that travelling carriage records, and when described Target cell and cell-of-origin can be switched, described first table and second table in the local storage of polling of radio network controller, therefrom take out time difference information and corresponding timestamp information between relevant base station, with the sub-district constant time lag, and, calculate described travelling carriage and switch required synchronization parameter according to the relation of B node frame number and System Frame Number.
11. the switching method for synchronous of Asynchronous Code Division Multiple Access according to claim 10 system is characterized in that, when described synchronization parameter is a described Target cell System Frame Number when deducting the time difference that obtains behind the System Frame Number of described cell-of-origin, calculates in the following manner:
(System Frame Number) ij-(System Frame Number) ks
=[(B node frame number) i-(B node frame number) k]+[((sub-district constant time lag) ks-(sub-district constant time lag) ij],
Wherein,
I represents base station, Target cell place, and j represents Target cell;
K represents base station, place, cell-of-origin, and s represents the cell-of-origin.
12. the switching method for synchronous of Asynchronous Code Division Multiple Access according to claim 10 system, it is characterized in that, when described synchronization parameter is a described cell-of-origin System Frame Number when deducting the time difference that obtains behind the travelling carriage x time Connection Frame Number, calculate in the following manner:
(System Frame Number) ij-(Connection Frame Number)
=[(B node frame number) i-(B node frame number) k]-[((sub-district constant time lag) ij-(sub-district constant time lag) ks]+Δ ks, wherein
Δ ks=(System Frame Number) ks-travelling carriage x time Connection Frame Number; And
I represents base station, Target cell place, and j represents Target cell;
K represents base station, place, cell-of-origin, and s represents the cell-of-origin.
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| WO2008019629A1 (en) * | 2006-08-15 | 2008-02-21 | Huawei Technologies Co., Ltd. | Method for a terminal measuring neighboring cells and ue thereof |
| WO2008083606A1 (en) * | 2006-12-30 | 2008-07-17 | Huawei Technologies Co., Ltd. | Method and device for controlling reporting timestamp of event |
| CN101990235A (en) * | 2009-08-06 | 2011-03-23 | 中兴通讯股份有限公司 | Method and user equipment for reporting time difference of service cell and neighboring cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6526039B1 (en) * | 1998-02-12 | 2003-02-25 | Telefonaktiebolaget Lm Ericsson | Method and system for facilitating timing of base stations in an asynchronous CDMA mobile communications system |
| US7876729B1 (en) * | 1998-07-20 | 2011-01-25 | Qualcomm Incorporated | Intersystem base station handover |
| KR100891785B1 (en) * | 2002-04-27 | 2009-04-07 | 삼성전자주식회사 | Method and apparatus for multicast multimedia broadcast service data packet control in a cdma mobile communication system |
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