CN1773887A - Interbase station B node frame number synchronizing method in wideband CDMA system and system thereof - Google Patents
Interbase station B node frame number synchronizing method in wideband CDMA system and system thereof Download PDFInfo
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Abstract
A method for synchronizing B node frame number between base stations in wideband CDMA system includes converting out relevant BFN counting value by base station according to GPS absolute time obtained by GPS satellite receiver from GPS signal, using converted out BFN counting value as current BFN counting value and carrying out inspection on it regularly, replacing actual value to be converted out BFN counting value when actual value is not consistent to required value.
Description
Technical field
The present invention relates to the communications field, particularly the B node frame number in the mobile communication (Node B FrameNumber is called for short " BFN ") simultaneous techniques.
Background technology
Over nearly 20 years, the development of mobile communication technology experienced for two generations, having finished from the analog cellular communication technology of the first generation is the transition of the digital communication technology of representative to the second generation with global system for mobile communications (Global System for MobileCommunications is called for short " GSM ").Now to 3-G (Generation Three mobile communication system) (Third Generation Mobile Communications System is called for short " 3G ") development.Wherein, Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, abbreviation " WCDMA ") technology is as (the International TelecommunicationUnion of International Telecommunications Union, abbreviation " ITU ") one of 3G main standard of regulation is a mainstream technology of 3G development.
At third generation partner plan (3rd Generation Partnership Projeet, abbreviation " 3GPP ") stipulates in the WCDMA standard of formulating, Node B in the WCDMA system is asynchronous, but be optional synchronously, therefore for asynchronous WCDMA system, need not between Node B synchronously, so do not need the external sync resource.Those of ordinary skill in the art are appreciated that the external sync resource generally is global positioning system (Global Position System, be called for short " GPS ") or other accurate clocks, as cesium-beam atomic clock etc.
In mobile communication system, an important technology that influences service quality is exactly a soft handover.So-called soft handover, be meant such as mobile phone, the subscriber equipment of movable computer and so on (User Equipment, be called for short " UE ") need with another base station (Base Station, be called for short " BS " or Node B) when communicating by letter, do not interrupt earlier and being connected of former Node B, but be connected with new Node B earlier, new Node B Common Pilot Channel (the Common Pilot Channel that the UE measurement is received, abbreviation " CPICH ") signal strength signal intensity also reports radio network controller (Radio Network Controller, be called for short " RNC "), whether RNC switches according to threshold value and resource situation decision that whether the measurement result that reports surpasses regulation.
And in asynchronous WCDMA system, when UE carried out soft handover in the sub-district of crossing over different N ode B, UE must carry out a series of operation and obtain time difference between new Node B and the former Node B, thereby obtained a common actual reference.
In the existing WCDMA system of following mask body introduction, when carrying out soft handover, UE obtains the time difference process between two Node B.
As shown in Figure 1,10, two Node B11 of a radio network controller, 12 constitute a RNS 1, and UE13 carries out the soft handover from Node B11 to Node B12.
At first in the step 100, UE13 detects the CPICH signal of the former Node B11 that receives from wherein obtaining the frame timing information of Node B11;
Equally, in step 101 subsequently, similar with step 100, UE13 detects the CPICH signal of the new NodeB12 that receives and obtains the frame timing information of Node B, by the frame timing information that obtains in the comparison step 100, thereby obtained the time difference of two Node B.UE13 is as follows to other processing of two Node B time differences: when time difference of Node B12 and Node B13 is in 10ms, that is to say in a frame, can determine relative timing from the phase place of main scrambler, because the frame length of scrambler also is 10ms; And if regularly uncertainty is bigger, UE13 also needs broadcast channel decoding and cyclic redundancy check (CRC) among the main CCPCH (Cyclic Redundancy Check is called for short " CRC ") verification.It is pointed out that this process is complicated and consuming time.
Next in step 102, UE13 reports to Node B11 with the time difference;
Step 103 then, Node B11 is sending to this time difference radio network controller 10 and is being handled by it;
Then in step 104, the time differential information after radio network controller will be handled sends to Node B12;
At last, in the step 105, Node B12 adjusts the timing of down link according to what receive from the time differential information of radio network controller 10, and adjusted down link signal is sent to UE13.
So just realized the timing of soft handover.From top process as can be seen, UE carries out the fixed cycle operator process more complicated of soft handover among the WCDMA, can make the increase of energy consumption of mobile equipment amount like this, thereby the more important thing is that the power control that may make soft handover produces delay and influences communication quality.
In the WCDMA standard that 3GPP formulates, having defined some is used for synchronous count parameter and has: Node B frame number (Node B Frame Number, be called for short " BFN "), radio network controller frame number (RNC Frame Number, be called for short " RFN "), System Frame Number (System Frame Number is called for short " SFN ") and Connection Frame Number (Connection Frame Number is called for short " CFN ").
RFN wherein, SFN be respectively as RNC, the time reference of the sub-district of Node B; CFN can be used as the time reference that UE is linked into network; BFN is that Node B inside is the counting of the basic frame of 10ms to length, in a Node B is consistent, span 0-4096, the corresponding cycle is 40.96s, BFN also is the basis of SFN, can be used as the time reference of Node B transmission and acknowledge(ment) signal, also can be used for the time difference between definite different N ode B.In service in the WCDMA system, there is certain synchronized relation in SFN between RFN and the CFN three.
If make between different N ode B BFN synchronous, thus realize different N ode B synchronously, just can solve among the existing WCDMA the regularly loaded down with trivial details shortcoming of complexity of soft handover, improve the performance of whole network.
Code division multiple access (Code Division Multiple Access is called for short " CDMA ") network is a synchro system, and the clock phase synchronization of each Node B realizes by GPS.Normally at base station transceiver (Base Transceiver Station, be called for short " BTS "), and base station controller (Base StationController, be called for short " BSC ") the GPS receiver all is housed, BTS and BSC obtain the GPS absolute time from the GPS receiver, and those of ordinary skill in the art know, BTS and BSC constitute base station sub-system (Base Station Subsystem, be called for short " BSS "), so the clock signal by GPS, each BSS in the cdma network has reached synchronous.
In actual applications, there is following problem in such scheme: because cdma network is designed to synchro system, so only need process slightly to gps signal, just can obtain the synchronizing signal that the cycle is 2s, and WCDMA is designed to asynchronous network, so the base station synchronization technology of CDMA can't be applied among the WCDMA.Therefore, it is synchronous to carry out effective BFN at present in the WCDMA system, thereby has influenced handover success rate and the power system capacity of UE, and UE switching flow complexity, and mobile telephone power consumption is bigger.
Cause the main cause of this situation to be, WCDMA and CDMA technology there are differences on synchronization criterion.
Summary of the invention
In view of this, main purpose of the present invention is to provide B node frame number method for synchronous and the system thereof between the base station in a kind of broadband CDMA system, makes Node B realize quickly that after startup BFN is synchronous, and keeps BFN synchronous in the back of starting working.
For achieving the above object, the invention provides the B node frame number method for synchronous between the base station in a kind of broadband CDMA system, comprise following steps:
A GPS satellite receiver obtains global positioning system absolute time and pps pulse per second signal from global positioning system signal, and sends to its corresponding base station;
The described base station of B master clock is followed the tracks of pps pulse per second signal, after realizing frequency-tracking, start Phase Tracking, simultaneously, described base station is according to the global positioning system absolute time, converse next 1 second corresponding B node frame number count value, and when next pps pulse per second signal arrives, current B node frame number count value is adjusted into the B node frame number count value that described conversion obtains.
Wherein, described B node frame number count value conversion method is:
B node frame number count value=global positioning system absolute time * 100mod 4096, wherein
Mod represents modulo operation.
Described method also comprises following steps:
The described base station of C is every predetermined amount of time, according to the global positioning system absolute time, converse next 1 second corresponding B node frame number count value, and when next pps pulse per second signal arrives, judge whether the B node frame number count value that current B node frame number count value and described conversion obtain is consistent, if inconsistent, then current B node frame number count value is adjusted into the B node frame number count value that described conversion obtains.
Described Phase Tracking is used to guarantee that the 10ms signal of base station master clock is with synchronous from the pps pulse per second signal of described GPS receiver.
Steps A of this method and the step B preceding execution that goes into operation in described base station.
The present invention also provides the B node frame number synchro system between the base station in a kind of broadband CDMA system, and wherein, described system comprises at least 2 base stations, described system also comprises at least 2 GPS receiver, wherein, described base station and described GPS receiver are corresponding one by one
Described GPS satellite receiver is used for obtaining global positioning system absolute time and pps pulse per second signal from global positioning system signal, and sends to its corresponding base station;
Described base station is used to follow the tracks of pps pulse per second signal, after realizing frequency-tracking, start Phase Tracking, simultaneously, described base station is according to the global positioning system absolute time, converse next 1 second corresponding B node frame number count value, and when next pps pulse per second signal arrives, current B node frame number count value is adjusted into the B node frame number count value that described conversion obtains.
Wherein, described B node frame number count value conversion method is:
B node frame number count value=global positioning system absolute time * 100mod 4096, wherein
Mod represents modulo operation.
Described base station also is used for every predetermined amount of time, according to the global positioning system absolute time, converse next 1 second corresponding B node frame number count value, and when next pps pulse per second signal arrives, judge whether the B node frame number count value that current B node frame number count value and described conversion obtain is consistent, if inconsistent, then current B node frame number count value is adjusted into the B node frame number count value that described conversion obtains.
The Phase Tracking that carry out described base station is used to guarantee that the 10ms signal of base station master clock is with synchronous from the pps pulse per second signal of described GPS receiver.
By relatively finding that technical scheme difference with the prior art of the present invention is, according to the GPS absolute time that the gps satellite receiver obtains, converses corresponding BFN count value by the base station from gps signal, as current BFN count value; And regularly check, when the value of discovery actual value and requirement is inconsistent, then it is replaced with the BFN count value that converts and obtain.
Difference on this technical scheme, brought comparatively significantly beneficial effect: realized effectively in the WCDMA system BFN between the different N ode B synchronously.And have switching flow, the handover success rate that improves UE of simplifying UE, the advantage that reduces mobile telephone power consumption.
Description of drawings
Fig. 1 is the soft handover timing process schematic diagram of WCDMA in the prior art;
Fig. 2 is the structural representation of BFN synchro system in the WCDMA according to an embodiment of the invention system;
Fig. 3 is the Node B software phase-lock loop road schematic diagram that the present invention relates to;
Fig. 4 is the schematic diagram of the BFN synchronization principles between the different N ode of WCDMA system B among the present invention;
Fig. 5 is the schematic flow sheet of BFN method for synchronous between the WCDMA different N ode B of system according to an embodiment of the invention;
Fig. 6 is between according to another embodiment of the invention the different N ode B of WCDMA system in the BFN method for synchronous, and the Node B back of starting working keeps the synchronous schematic flow sheet of BFN.
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, principle of the present invention is, according to the GPS absolute time from the gps satellite receiver, converses corresponding BFN count value, as current BFN count value by the base station.And,, it is replaced with the BFN count value that converts and obtain at the inconsistent situation of the value of actual value and requirement by making regular check on.The BFN that has realized the Node B in the WCDMA system thus is synchronous, has improved handover success rate and service quality, also saves the power consumption of UE.
Below in conjunction with Fig. 2, the structure and the course of work thereof of BFN synchro system between the Node B are described in the WCDMA according to an embodiment of the invention system.
As shown in Figure 2, the BFN synchro system in the WCDMA system between the base station comprises 20,2 base stations of gps satellite 22,24, comprises 2 GPS receivers 21,23 in addition.Wherein, base station 22,24 is corresponding one by one with described GPS receiver.
Gps satellite 20 is used for to GPS receiver 21 and 23 emission gps signals.
GPS receiver 21 and 23 is used for obtaining GPS absolute time and 1PPS signal (pps pulse per second signal) from gps signal, and sends to its corresponding base station 22 and 24.
Base station 22 and 24 is used to follow the tracks of the 1PPS signal, after realizing frequency-tracking, start Phase Tracking, simultaneously, the base station converses next 1 second corresponding BFN according to the GPS absolute time, and when next 1PPS signal arrives, current BFN is adjusted into the BFN that described conversion obtains, finishes synchronous adjustment, thereby make the BFN of different N ode B reach consistent the BFN counter.
It may be noted that, in another embodiment of the present invention, base station 22 and 24 also is used for every predetermined amount of time, according to the GPS absolute time, converse next 1 second corresponding BFN, and when next 1PPS signal arrives, judge whether the BFN that current BFN and described conversion obtain is consistent, if inconsistent, then current BFN is adjusted into the BFN that converts and obtain.By Node B regular check BFN value, make BFN be kept synchronously thus.
Introduce the general structure of the BFN synchro system of the present invention's proposition above, further described the course of work of BFN synchro system below.
At first, after Node B22,24 started, gps satellite 20 was constantly to GPS receiver 21,23 send gps signal, and 21,23 pairs of gps signals that receive of GPS receiver are handled, therefrom obtain GPS absolute time and 1PPS signal, after it is sent to corresponding Node B22,24 respectively.
Then, Node B22 receives gps time signal, and its master clock is followed the tracks of the 1PPS signal by software phase-lock loop (PhaseLock Loop is called for short " PLL "), carries out frequency-tracking and Phase Tracking.In order to be described more specifically BFN synchro system operation principle of the present invention, simple declaration herein is software PLL once.As shown in Figure 3, software PLL3 comprises phase discriminator 30, filtering and state estimation algorithm 31, digital to analog converter 32 (Digital Analog Converter, be called for short " DAC ") and constant temperature VCXO 33 (Oven Control Voltage Control Crystal Oscillator is called for short " OCVCXO ").Service signal stream 300 is external reference clock sources, is the 1PPS signal in this example, and service signal stream 301 is to realize phase-locked back and input clock clock signal synchronous, and what export in this example is the 10ms clock signal.The logical block of phase discriminator 30 is realized the hardware phase demodulation counting of Node B master clock to the 1PPS signal, and phase discriminator 30 is passed to CPU with the phase demodulation count value then, and CPU carries out software filtering and state estimation by filtering and state estimation algorithm 31; CPU is produced the controlling value of DAC32 by respective algorithms then, this controlling value makes DAC32 produce the frequency that control voltage is adjusted local clock source OCVCXO33, by negative feedback loop OCVCXO33 is further adjusted again, make the required high accurate clock signal of OCVCXO33 output Node B system.
When realizing Phase Tracking, Node B22 is according to the GPS absolute time, converse next 1 second corresponding BFN count value, and when next 1PPS signal arrives, current BFN count value is adjusted into the BFN count value that is converted, after same Node B24 receives the time signal of GPS receiver 23, also carry out identical processing.Because the GPS absolute time that Node B22,24 receives is consistent, must be identical so convert the BFN count value that obtains.
Node B22,24 the counter of BFN separately are starting point with this BFN count value then, and the 10ms frame signal at 0-4095 scope intercycle counting, is exported to each business board with the BFN count value that produces and used.Because Node is B22,24 clock signal of system and 1PPS signal are in the Phase Tracking state, that is to say the 10ms frame signal and the 1PPS signal Synchronization that are used to count, so the BFN count value that is produced according to the 10ms frame signal by the BFN counter just is synchronized with the 1PPS signal of GPS, so just realized that Node B22,24 BFN are synchronous.
In system's running, because the 1PPS signal of Node B system clock and GPS is phase-locked, so the BFN count value that produces based on system clock is synchronous with gps time signal, this makes the synchronous regime of BFN generally can stablize maintenance.And, needing Node B regularly BFN to be carried out sync check in order to take precautions against unexpected generation, this points out in an embodiment above.Below in conjunction with Fig. 2 explanation that further makes an explanation.
Node B22,24 every the scheduled time just according to the GPS absolute time, converse next 1 second corresponding BFN count value, and when next 1PPS signal arrives, judge whether current BFN count value and conversion obtain the BFN count value consistent, if consistent, illustrate that BFN and gps time signal keep synchronously, if inconsistent, then current BFN count value is adjusted into the BFN count value that described conversion obtains, so just make Node B22,24 kept BFN synchronously.
Those of ordinary skill in the art know that more accurate if initial position parameters and time are provided with, the GPS receiver can trace into gps satellite and output time signal very soon in the time of minute level.And to WCDMA of the present invention system in the BFN synchro system of different N ode B, requirement is after Node B starts 2 minutes, the GPS receiver that links to each other with Node B is wanted can lock enough gps satellites and handle the output time signal, and the phase locked algorithm of GPS and hardware guarantee that Node B realized the synchronous adjustment of BFN in 3 minutes, and after this Node B just can work.It is synchronous to that is to say that the GPS receiver will provide enough supports to make each Node B can reach BFN after starting 5 minutes, thereby carries out operate as normal.
For above-mentioned BFN synchro system, also need explanation: the signal delay that the transmission of GPS circuit causes can stick into the disposable corresponding time bias of row to GPS when mounted by software, but this postpones generally in the ns magnitude, almost can not influence the synchronous of BFN, also can not consider.
Below, with reference to Fig. 5 and Fig. 6, further specify the BFN method for synchronous between the base station in the WCDMA system that the present invention proposes.
As shown in Figure 5, in an embodiment of the BFN method for synchronous that the present invention proposes, comprise 2 big steps.
In first big step, the gps satellite receiver obtains GPS absolute time and 1PPS signal from gps signal, and sends to its corresponding base station.Specifically, this step is divided into following substep:
At first, in step 500, the GPS receiver receives gps signal 400 by GPS card 40, obtains GPS absolute time 402 and 1PPS signal 401 by processing.
Then, in step 501, GPS card 40 sends to corresponding N ode B with GPS absolute time 402 and 1PPS signal 401, specifically, GPS absolute time 402 is by proposed standard-232-C (Recommend Standard-232-C, abbreviation " RS-232-C ") serial ports outputs among the processor CPU42 of corresponding Node B, and those of ordinary skill in the art know that RS-232-C is the interface of the serial binary exchanges data between data terminal equipment and data communications equipment.The 1PPS signal then is to output among the software PLL of corresponding Node B.It is pointed out that the GPS absolute time is meant goes up a pairing absolute moment of 1PPS signal before this.
In second big step, the base station master clock is followed the tracks of the 1PPS signal, behind the realization frequency-tracking, start Phase Tracking, simultaneously, the base station is according to the GPS absolute time, converse next 1 second corresponding BFN, and when next 1PPS signal arrives, current BFN is adjusted into the BFN that converts and obtain.It is to be noted, following formula is adopted in the calculating of BFN count value: BFN count value=GPS absolute time length * 100Mod 4096, GPS absolute time length generally is with the GPS actual zero point, promptly 1980 on January 6,0: 0: 0, be the time span of starting point, unit is second, and Mod represents modulo operation, during zero point, regulation BFN count value is 0 in the GPS absolute time.Formula can be in the hope of the BFN value of any time correspondence thus, for example, suppose that the Current GPS absolute time is 0: 59: 59 on the 6th January in 1980, its following 1 second is 1: 0: 0 on the 6th January in 1980, being converted into GPS absolute time length is 3600 seconds, by top formula: 3600 * 100 Mod 4096=3648, so the BFN count value of current next 1PPS signal correspondence should be 3648.
The BFN synchronization principles that the present invention is correlated with shown in Fig. 4.GPS card 40, software phase-lock loop road 41, CPU42 and BFN counter 43 are arranged among Fig. 4.Those of ordinary skill in the art know that GPS card 40 is critical pieces of GPS receiver, are used for gps signal is handled, and produce GPS absolute time and 1PPS signal by it; Software phase-lock loop road 41, CPU42 and BFN counter 43 in the corresponding component of Node B, are used for the time signal processing and the realization BFN of GPS card 40 synchronous respectively.
On the basis of the above, below second largest step is specifically launched, this step comprises following substep:
As shown in Figure 5, in step 502, Node B utilizes the 1PPS signal 401 of software PLL41 tracking GPS, and to its frequency locking.
Then, execution in step 503, the Phase Tracking that the phase-locked loop 41 of Node B starts 1PPS signal 401; Simultaneously, the CPU processor 42 of Node B according to the GPS absolute time 402 that GPS card in the step 501 transmits, calculates corresponding BFN count value of current next second, and this value is sent in the BFN logic counter presets.It is pointed out that CPU42 calculates according to following formula when calculating BFN equally: absolute time length * 100Mod 4096, the value that obtains is corresponding to the GPS absolute time BFN count value of 402 next seconds.
In step 504, come then at last, the BFN value be set at the BFN count value that conversion obtains in the step 503 at next 1PPS signal pulse, this just realized different N ode BBFN synchronously.
In another embodiment of the present invention, in order to make Node B after starting working, still can keep BFN to be in synchronous regime, therefore, also comprise a big step: the base station is every predetermined amount of time, according to the GPS absolute time, converse next 1 second corresponding BFN, and when next 1PPS signal arrives, judge whether the BFN that current BFN and described conversion obtain is consistent, if inconsistent, then current BFN is adjusted into the BFN that described conversion obtains.Below with reference to Fig. 6, several sub-steps that this step is comprised are described further.
At first, in step 600, Node B checks from last BFN adjustment synchronously to be counted till now, whether has arrived preset time, if arrived with regard to execution in step 601, if not with regard to inoperation.
In step 601, Node B calculates pairing BFN value of next second according to GPS absolute time 402, and computational methods repeat no more with step 503 herein.
Then, enter step 602, when next 1PPS arrived, Node B judged whether current BFN value is consistent with the BFN that is converted, if unanimity then judged result are for being, execution turns to step 600, if inconsistent, then judged result is to deny execution in step 603.
In step 603, current BFN value is adjusted into the BFN value that obtains in the step 601, turn to execution in step 600 then.Realized after Node B starts working, keeping the synchronous purpose of BFN thus.
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 (9)
1. the B node frame number method for synchronous between the base station in the broadband CDMA system is characterized in that, comprises following steps:
A GPS satellite receiver obtains global positioning system absolute time and pps pulse per second signal from global positioning system signal, and sends to its corresponding base station;
The described base station of B master clock is followed the tracks of described pps pulse per second signal, realizing starting Phase Tracking behind the frequency-tracking, simultaneously, described base station is according to the global positioning system absolute time, converse next 1 second corresponding B node frame number count value, and when next pps pulse per second signal arrives, current B node frame number count value is adjusted into the B node frame number count value that described conversion obtains.
2. the B node frame number method for synchronous in the broadband CDMA system according to claim 1 between the base station is characterized in that, described B node frame number count value conversion method is:
B node frame number count value=global positioning system absolute time * 100mod4096, wherein mod represents modulo operation.
3. the B node frame number method for synchronous in the broadband CDMA system according to claim 1 between the base station is characterized in that described method also comprises following steps:
The described base station of C is every predetermined amount of time, according to the global positioning system absolute time, converse next 1 second corresponding B node frame number count value, and when next pps pulse per second signal arrives, judge whether the B node frame number count value that current B node frame number count value and described conversion obtain is consistent, if inconsistent, then current B node frame number count value is adjusted into the B node frame number count value that described conversion obtains.
4. the B node frame number method for synchronous in the broadband CDMA system according to claim 1 between the base station, it is characterized in that described Phase Tracking is used to guarantee that the 10ms signal of base station master clock is with synchronous from the pps pulse per second signal of described GPS receiver.
5. the B node frame number method for synchronous in the broadband CDMA system according to claim 1 between the base station is characterized in that, steps A of this method and the step B preceding execution that goes into operation in described base station.
6. the B node frame number synchro system between the base station in the broadband CDMA system, wherein, described system comprises at least 2 base stations, it is characterized in that, described system also comprises at least 2 GPS receiver, wherein, described base station and described GPS receiver are corresponding one by one, and
Described GPS satellite receiver is used for obtaining global positioning system absolute time and pps pulse per second signal from global positioning system signal, and sends to its corresponding base station;
Described base station is used to follow the tracks of pps pulse per second signal, after realizing frequency-tracking, start Phase Tracking, simultaneously, described base station is according to the global positioning system absolute time, converse next 1 second corresponding B node frame number count value, and when next pps pulse per second signal arrives, current B node frame number count value is adjusted into the B node frame number count value that described conversion obtains.
7. the B node frame number synchro system in the broadband CDMA system according to claim 6 between the base station is characterized in that, described B node frame number count value conversion method is:
B node frame number count value=global positioning system absolute time * 100mod4096, wherein Mod represents modulo operation.
8. the B node frame number synchro system in the broadband CDMA system according to claim 6 between the base station, it is characterized in that, described base station also is used for every predetermined amount of time, according to the global positioning system absolute time, converse next 1 second corresponding B node frame number count value, and when next pps pulse per second signal arrives, judge whether the B node frame number count value that current B node frame number count value and described conversion obtain is consistent, if inconsistent, then current B node frame number count value is adjusted into the B node frame number count value that described conversion obtains.
9. the B node frame number synchro system in the broadband CDMA system according to claim 6 between the base station, it is characterized in that the Phase Tracking that carry out described base station is used to guarantee that the 10ms signal of base station master clock is with synchronous from the pps pulse per second signal of described GPS receiver.
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| JP3839277B2 (en) * | 2001-05-25 | 2006-11-01 | 三菱電機株式会社 | Wireless communication system and base station frame synchronization method |
| KR100524739B1 (en) * | 2002-12-06 | 2005-10-31 | 엘지전자 주식회사 | Soft handover method for mobile telecommunication system |
| KR20040060435A (en) * | 2002-12-30 | 2004-07-06 | 엘지전자 주식회사 | node synchronized device of the W-CDMA system and controlling method therefore |
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