CN1299446C - A method of frame synchronization for wireless interface of time division communication system - Google Patents
A method of frame synchronization for wireless interface of time division communication system Download PDFInfo
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- CN1299446C CN1299446C CNB2004100271298A CN200410027129A CN1299446C CN 1299446 C CN1299446 C CN 1299446C CN B2004100271298 A CNB2004100271298 A CN B2004100271298A CN 200410027129 A CN200410027129 A CN 200410027129A CN 1299446 C CN1299446 C CN 1299446C
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Abstract
The present invention discloses a method of frame synchronization for a wireless interface of a time division communication system, which solves the technical problems that frame synchronization is difficult to realize by a timing detection circuit and frame timing errors of base station equipment result in bad synchronization effect existing in the prior art. The present invention carries out search frame synchronization by making use of hardware resources of the base station equipment and adopting software programming. The present invention comprises the following procedures: all UW words of a down control channel are searched out of all received signals of the base station equipment; the down control channel of corresponding base station equipment is received once more according to positions of the UW words, the identification number and the signal strength of the down control channel in a network are recorded, and base station equipment with the highest synchronization grade and most strong signals is selected; a certain down control channel of the base station equipment is found out, and a frame head of the down control channel is found out according to positions of UW words thereof; frame head offset needed by frame synchronization is calculated, and the frame head of the base station equipment is adjusted. The present invention reduces the complicated degree and the system cost of the existing method of frame synchronization and makes frame synchronization have best effect and minimal interference.
Description
Technical field
The present invention relates to time division communication system, relate in particular to the method for wave point frame synchronization in the time division communication system.
Background technology
As everyone knows, TDMA (Time Division Multiple Access, time division multiple access)/TDD (Time Division Double, time division duplex) communication system of mode work, particularly PHS (Personal Handy System, personnel hand system) adopts the microcellulor technology, be the system that the networking of many stylobates station equipment communicates, Bulk Call, highdensity service can be provided.The TDMA/TDD time division multiplexing is that a carrier wave is divided into the uplink and downlink time slot according to the time, and an ascending time slot and a descending time slot are formed a duplex channel.This technology is exactly in order effectively to utilize limited frequency resource, yet, if the base station in the net all is independent separately, can not accomplish to receive and dispatch slot synchronization, will cause the overlapping and time slot interference of time slot and cause channel block.Experiment showed, that the system that does not adopt frame synchronizing will reduce by 30% capacity.So increasing power system capacity demand has also proposed more and more higher requirement synchronously to system-frame.
Through detailed patent retrieval, it is as follows to obtain relevant patent:
1, number of patent application: 00103814.1, publication number: CN1266342A, patent name: base station equipment and method for obtaining frame synchronizing.The technical scheme of this patent is: pass through directivity controller, the directivity of control antenna, send signal directly to receive from base station as the frame synchronization reference substance with antenna, detection is as the transmission timing of the base station equipment of reference synchronization thing, and, regularly control the transmission timing of base station equipment according to the transmission that detects.
2, number of patent application: 97111484.6, publication number: CN1182341A, patent name: frame synchornization method and frame-synchronizing device.This patented technology scheme is: the control channel transmission timing that dominant base is generated is transformed into clock signal, utilize industrial electric wire/electric wave or infrared ray/communication line that the slave base stations of this clock signal to time division multiple access/time-division multiplex mode sent, in this slave base stations, generate the control channel transmission timing according to the above-mentioned sequential that receives.
3, number of patent application: 97121542.1, publication number: CN1201323A, patent name: frame-synchronizing device and method thereof.This patented technology scheme is that the frame time information by the external device (ED) of digital interface output produces a frame reseting signal, thereby and whole system resetted according to this frame reseting signal realizes synchronously.
4, number of patent application: 268454, publication number: 5619507, patent name: Methodand apparatus for establishing and maintaining framesynchronization in a satellite communication system.This patented technology scheme is: detect the UW word by signal modulation, selection circuit, UW word testing circuit, finish frame synchronization through vertical sync circuit again.
5, number of patent application: 767726, publication number: 5440561, patent name: Methodfor establishing frame synchronization within a TDMAcommunication system.This patented technology scheme is: calculate the timing difference between the base station, thereby definite frame position is carried out frame synchronization.
6, number of patent application: 125716, publication number: 6480483, patent name: Framesynchronization system between base stations of mobile radiocommunication system and base station device employing thissystem.This patented technology scheme is: carry out frame synchronization with the frame timing difference between the principal and subordinate base station.
From above-mentioned patented technology and present known technology, the frame synchronizing of TDMA/TDD system also has certain limitation, major part all is to have added complicated ancillary equipment and device, reaches the purpose of frame synchronization by a cover timely checking circuit, is difficult to realize and the cost height.In addition, this timely checking circuit generally is the frame timing that detects the base station equipment nearest with it, regularly carry out synchronously as frame with it, and the frame of every stylobate station equipment regularly all has certain mistake, has caused final synchronous effect relatively poor.
Summary of the invention
The method that the purpose of this invention is to provide a kind of time division communication system wave point frame synchronization.Solving prior art is difficult to the frame timing error that achieve frame reaches base station equipment synchronously by timely checking circuit and causes the relatively poor technical problem of synchronous effect.Thereby realize reducing the complexity and the system cost of existing frame synchornization method, make the effect optimum of frame synchronization, disturb minimum.
For achieving the above object, the invention provides a kind of method of time division communication system wave point frame synchronization, may further comprise the steps:
Step 1: from the signal of all base station equipments that receive, search out UW (Unique Word, the unique identifier word) word of all down control channels.
This step may further comprise the steps again:
Step 1 allows the frame number circulation of starting from scratch, and the frame here promptly is the basic frame in the superframe.Because method for synchronous of the present invention is applicable to all systems with the transmission of this frame period, according to the difference of system for super-frame elementary cell length separately, the number of basic frame also is different;
Step 2 judges that the current frame number that will handle is whether less than the basic frame number of superframe in the system.If less than, then execution in step 3; If not less than, then execution in step 8;
Step 3 is read in the initial data that receives signal, and all time slot initial data of each basic frame all will read;
Step 4, the initial data of taking out according to step 3 is the data that therefrom intercept the receive window scope of certain bit, being shifted by turn with the UW word with fixed bit content compares;
Step 5 is judged UW word result relatively whether in the bit error scope of its permission, if in the bit error scope that allows then show that the UW word searches for successfully;
Step 6, the UW word according to searching writes down the position that its fixed bit begins.If the result of UW word comparison is exceeding the bit error scope of its permission, then show current UW word, the execution in step 7 of also successfully not finding;
Step 7, frame number adds 1, and beginning is in the UW of next frame search;
Step 8 is search window of the frame head slippage of base station equipment frame.
Step 2: according to the position of UW word, receive the signal of the down control channel of corresponding base station equipment once more, identification number and the signal strength signal intensity of record base station equipment in network selects a synchronous rank the highest, the base station equipment that received signal is the strongest.
This step may further comprise the steps again:
Step 1 is done CRC (check code) verification to the UW word and the frame header deviation amount that search;
Step 2 is carried out CRC check result's judgement, if " correctly " illustrates that the signal data that is received does not have error of transmission, then execution in step 3; If judge CRC check result " incorrect ", show that then the signal data that is received is unavailable, then execution in step 6;
Step 3, from the reception primary signal that searches the UW word, be offset certain bit and further find out base station equipment identification number (CSID), the CSID that searches is screened, only unduplicated base station equipment identification number is noted, write down the signal strength signal intensity of the every stylobate station equipment that receives simultaneously;
Step 4 according to the height of each base station equipment received signal intensity and the synchronization levels of base station equipment etc., is chosen wherein a base station equipment as treating that synchronous base station equipment wants synchronous best base station equipment;
Step 5 is differentiated the synchronising base station equipment that whether found, if find, then flow process finishes; If do not find, then execution in step 6;
Step 6 is returned step 1 after the time-delay, continue the search of next time.
Step 3: find out certain down control channel of this base station equipment, find out the frame head of this down control channel according to the position of the UW word of this down control channel.
This step may further comprise the steps again:
Step 1 is done CRC check to the UW word and the frame header deviation amount that search.
Step 2 is carried out CRC check result's judgement, if " correctly " illustrates that then the signal data that is received does not have error of transmission, then execution in step 3; If judge CRC check result " incorrect ", show that the signal data that is received is unavailable, then carry out 6;
Step 3 from the reception primary signal that searches UW word and base station equipment identification number, is offset certain bit further according to the down control channel sign of base station equipment, finds out the control channel that the superframe frame head sends;
Step 4 judges whether to find the down control channel of superframe frame head, if find, then flow process finishes; If do not find, then execution in step 5;
Step 5 is returned step 1 after the time-delay, continue the search of next time.
Step 4: calculate the frame header deviation amount that base station equipment frame synchronization needs, adjust this base station equipment frame head.
The present invention utilizes time-division system protocol frame structure self characteristics by the existing hardware resource of base station equipment, adopts software programming to carry out the method for search type frame synchronization, has realized following beneficial effect:
One, frame synchornization method of the present invention utilizes the characteristics of wireless channel frame self, there are not unnecessary special timing circuit and device, need not be by any equipment such as industrial electric wire, do not increase any complexity and the hardware device cost of system, succinctly, conveniently, can random flexibly networking with the base station of this method, between the base station equipment, realized optimum frame synchronization between the base station equipment group;
Two, the frame synchronization that adopts method provided by the invention to implement has remedied conventional method because the deficiency of the frame synchronizing effect difference that the transmission error that the dependence peripheral circuit causes causes has realized high-precision frame synchronizing effect fully;
Three, the method for the invention has bigger versatility, and it is synchronous that the time division communication system with anchor-frame form transmission all can carry out the signal transmitting and receiving of each equipment room with the inventive method, reaches the non-interfering purpose of equipment room.
Description of drawings
Fig. 1 is the frame assumption diagram of time division communication system;
Fig. 2 is the frame bit architecture figure of time division communication system control time slot;
Fig. 3 is the main flow chart of time division communication system wireless base station device frame synchronization;
Fig. 4 is the flow chart of UW word search;
Fig. 5 is the flow chart of base station equipment identification number search;
Fig. 6 is the flow chart of control channel frame head search;
Fig. 7 be achieve frame synchronously by the structure chart of base station equipment.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further details.
Fig. 1 is the frame assumption diagram of time division communication system.Signal is the radio signal of time division multiplexing (TDMA), time division duplex (TDD) system.Specific to the PHS system, follow the STD28 agreement.Each frame is divided into 8 time slots, each time slot 625 μ s.In 8 time slots, 101,102,103,104 these 4 time slots are descending, send out time slot, and 105,106,107,108 these 4 time slots are up, the time receiving crack constitutes 4 time division duplex channels, wherein time slot 101-105,102-106, every pair of channel of the corresponding respectively composition of 103-107,104-108.In actual applications, has the signal mode of above signal characteristic applicable to method of the present invention.
Fig. 2 is the frame bit architecture figure of time division communication system control time slot.Signal frame form of the present invention must have the fixed bit position.Certainly, the Frame of different system, its fixed bit figure place can be different, so the present invention is applicable to the different system with fixed bit bit data frames.
With the PHS system is example; 201 is last raise-positions (R) of 4 bits among the figure; 202 is first symbols (SS) of 2 bits; 203 is bit preamble (PR) of 6 bits; 204 is unique identifier words (UW) of 32 bits, and 205 is channel identification code (CI) of 4 bits, and there are some information bits the centre; 206 is CRC of 16 bits then, and 207 is guard bits (Guard) of 16 bits.
Fig. 3 is the main flow chart of time division communication system wireless base station device frame synchronization.The method of the invention may further comprise the steps: one, from the signal of all base station equipments that receive, search out UW (Unique Word, the unique identifier word) word of all down control channels; Two, according to the position of UW word, receive the down control channel of corresponding base station equipment once more, write down its identification number and signal strength signal intensity in network; Three, select a synchronous rank the highest, the base station equipment that signal is the strongest; Four, find out certain down control channel of this base station equipment, find out its frame head according to the position of its UW word; Five, calculate side-play amount, adjust this base station equipment frame head.301 unit UW search routine promptly are from the signal of all peripheral base stations that receive, and search out the UW word of all base station down control channels.The Base Station Identification search routine of Unit 302 promptly is the position according to the UW word, receives the down control channel of corresponding base station once more, identification number and the signal strength signal intensity of record base station in network, and select the strongest base station of a received signal.The control channel search of Unit 303 promptly is certain down control channel of finding out selected base station, front, finds out its frame head according to the position of its UW word.The displacement of the frame head of Unit 304 promptly is that the frame head according to control channel calculates side-play amount, adjusts this base station frame head, thereby finishes frame synchronizing process.
Fig. 4 is the flow chart of UW word search, has described the detailed process of Unit 301 among Fig. 3.According to PHS STD-28 agreement, control channel is with the form transmission of superframe and receives.Can represent that the channel minimal circulation of whole control channels (comprising broadcast channel, paging channel etc.) time slot location is called the superframe of control channel.According to the difference of superframe parameter, comprise frame elementary cell length, paging packet count, control channel spacing value etc., the superframe of PHS system can have multiple compound mode.In the control channel superframe structure, broadcast channel transmits at the place that begins of frame, and simultaneously, the beginning of a superframe has promptly been represented in the transmission of broadcast channel.
The search of UW word may further comprise the steps:
Fig. 5 is the flow chart of base station equipment identification number search, has described the detailed process of Unit 302 among Fig. 3.The search of base station equipment identification number may further comprise the steps:
Step 501 is done CRC check to the UW word and the corresponding offset that search;
Step 502 is carried out CRC check result's judgement, if " correctly " illustrates that then the signal data that is received does not have error of transmission, execution in step 503; If judge CRC check result " incorrect ", show that then the signal data that is received is unavailable, then execution in step 506;
Step 504 according to the height of each base station received signal intensity and the synchronization levels of base station etc., is chosen wherein a base station and is wanted synchronous best base station as this base station;
Step 505 is differentiated and whether has been found synchronising base station, if find, then flow process finishes; If do not find, then execution in step 506;
Fig. 6 is the flow chart of control channel frame head search, has described the detailed process of Unit 303 among Fig. 3.The search of control channel frame head may further comprise the steps:
Step 601 is done CRC check to the UW word and the corresponding offset that search.
Step 602 is carried out CRC check result's judgement, if " correctly " illustrates that then the signal data that is received does not have error of transmission, then execution in step 603; If judge CRC check result " incorrect ", show that then the signal data that is received is unavailable, then carry out 606;
Step 604 judges whether to have found the BCCH channel, if find, then execution in step 605; If do not find, then execution in step 606;
Step 605 according to the BCCH channel that finds, calculates the frame header deviation amount that final base station frame synchronization needs from the received signal frame;
Received signal in the most preferred embodiment of the present invention has strict requirement to service quality, and the information data CRC check can not be wrong, and synchronization character allows the error of 1 bit.For requiring so not strict system can carry out the check and the differentiation of corresponding permission to the received signal.
Fig. 7 be achieve frame synchronously by the structure chart of base station equipment.Comprise an antenna feed 701, receiver 702, demodulating unit 703, received signal intensity detection unit 704, baseband signal processing unit 705.Antenna feed 701 is coupled on the receiver 702, as the input signal source of receiver 702.Input to demodulating unit 703 from the received signal of receiver 702 outputs, carry out the digital demodulation of receiving intermediate frequency signal at demodulating unit 703, thereby provide the bitstream data of certain format to do further processing to baseband signal processing unit 705.Received signal intensity detection unit 704 is coupled on the receiver 702, detects the intensity of the received signal on the antenna feed 701, and detected signal strength signal intensity is inputed to baseband signal processing unit 705 does further processing.
Claims (5)
1, a kind of method of time division communication system wave point frame synchronization is characterized in that, may further comprise the steps:
1.1 from the signal of all base station equipments that receive, search out unique identifier word of all down control channels;
1.2 according to the position of unique identifier word, receive the signal of the down control channel of corresponding base station equipment once more, identification number and the signal strength signal intensity of record base station equipment in network selects a synchronous rank the highest, the base station equipment that received signal is the strongest;
1.3 find out certain down control channel of this base station equipment, find out the frame head of this down control channel according to the position of unique identifier word of this down control channel;
1.4 calculate the frame header deviation amount that base station equipment frame synchronization needs, adjust this base station equipment frame head.
2, the method for time division communication system wave point frame synchronization as claimed in claim 1 is characterized in that, described step 1.1 may further comprise the steps:
2.1 allow the frame number circulation of starting from scratch, the frame here promptly is the basic frame in the superframe;
2.2 judge the current frame number that will handle whether less than the basic frame number of superframe in the system, if less than, then execution in step 2.3; If not less than, then execution in step 2.8;
2.3 read in the initial data that receives signal, all time slot initial data of each basic frame all will read;
2.4 according to the initial data that step 2.3 is taken out, the unique identifier word of data intercept window is shifted by turn and compares;
2.5 judge unique identifier word result relatively whether in the bit error scope of its permission, if in the bit error scope that allows then show that unique identifier word searches for successfully;
2.6 the unique identifier word according to searching writes down the position that its fixed bit begins; If the result of unique identifier word comparison is exceeding the bit error scope of its permission, then show current unique identifier word, the execution in step 2.7 of also successfully not finding;
2.7 frame number adds 1, the search of unique identifier word of beginning next frame;
2.8 search window of the frame head slippage of base station equipment frame.
3, the method for time division communication system wave point frame synchronization as claimed in claim 2 is characterized in that, data window described in the step 2.4 is in order to find out fully fast that a time slot receives the unique identifier word in the data and the window set.
4, the method for time division communication system wave point frame synchronization as claimed in claim 1 is characterized in that, described step 1.2 may further comprise the steps:
4.1 the unique identifier word and the frame header deviation amount that search are done the check code verification;
4.2 carry out the judgement of check code check results, if " correctly " illustrates that the signal data that is received does not have error of transmission, then execution in step 4.3; If judge check code check results " incorrect ", show that then the signal data that is received is unavailable, then execution in step 4.6;
4.3 from the reception primary signal that searches unique identifier word, further find out the base station equipment identification number, the base station equipment identification number that searches is screened, only unduplicated base station equipment identification number is noted, write down the signal strength signal intensity of the every stylobate station equipment that receives simultaneously;
4.4, choose wherein a base station equipment as treating that synchronous base station equipment wants synchronous best base station equipment according to the height of each base station equipment received signal intensity and the synchronization levels of base station equipment etc.;
4.5 differentiate the synchronising base station equipment that whether found, if find, then flow process finishes; If do not find, then execution in step 4.6;
4.6 return step 1.1 after the time-delay, continue the search of next time.
5, the method for time division communication system wave point frame synchronization as claimed in claim 1 is characterized in that, described step 1.3 may further comprise the steps:
5.1 the unique identifier word and the frame header deviation amount that search are done the check code verification;
5.2 carry out the judgement of check code check results, if " correctly " illustrates that then the signal data that is received does not have error of transmission, then execution in step 5.3; If judge check code check results " incorrect ", show that the signal data that is received is unavailable, then execution in step 5.6;
5.3 from the reception primary signal that searches unique identifier word and base station equipment identification number, be offset certain bit, find out the control channel that the superframe frame head sends further according to the down control channel sign of base station equipment;
5.4 judged whether to find the down control channel of superframe frame head, if find, then flow process finishes; If do not find, then execution in step 5.5;
5.5 return the search that step 1.1 continues next time after the time-delay.
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| CNB2004100271298A CN1299446C (en) | 2004-05-01 | 2004-05-01 | A method of frame synchronization for wireless interface of time division communication system |
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| CN1838561B (en) * | 2005-03-24 | 2010-11-03 | 华为技术有限公司 | Method for transmitting baseband data time label in universal public wireless interface |
| CN1960214B (en) * | 2006-09-28 | 2010-06-16 | Ut斯达康(中国)有限公司 | Method for realizing synchronization in PHS system |
| CN101141238B (en) * | 2007-09-13 | 2012-11-28 | 中兴通讯股份有限公司 | Superframe frame synchronization method and device |
| CN101184277B (en) * | 2007-12-07 | 2011-12-07 | 中兴通讯股份有限公司 | Inter-base station synchronization method in time division multiple access system |
| CN101232325B (en) * | 2008-01-31 | 2013-01-09 | 华为技术有限公司 | Radio communication system, midair interface synchronism control method, base station and control device thereof |
| CN101795155B (en) * | 2010-03-02 | 2013-01-02 | 大唐联诚信息系统技术有限公司 | Method and device for synchronizing wireless communication system |
| CN113824688B (en) * | 2021-08-24 | 2023-04-25 | 广州市瑞立德信息系统有限公司 | Encryption communication method, network controller and access control system |
| CN114050888B (en) * | 2021-11-10 | 2024-02-09 | 哈尔滨工业大学 | UW-assisted relay network asynchronous superposition signal recovery method |
| CN117240313A (en) * | 2023-11-16 | 2023-12-15 | 吉林亮中科技有限公司 | Multichannel asynchronous interference detection avoidance system and method |
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