CN1182990A - Method for establishing and holding synchronous code division multiple access communication chain - Google Patents
Method for establishing and holding synchronous code division multiple access communication chain Download PDFInfo
- Publication number
- CN1182990A CN1182990A CN97118934A CN97118934A CN1182990A CN 1182990 A CN1182990 A CN 1182990A CN 97118934 A CN97118934 A CN 97118934A CN 97118934 A CN97118934 A CN 97118934A CN 1182990 A CN1182990 A CN 1182990A
- Authority
- CN
- China
- Prior art keywords
- time
- terminal
- signal
- synchronous
- base station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 106
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 86
- 238000004891 communication Methods 0.000 title claims abstract description 54
- 230000008569 process Effects 0.000 claims abstract description 55
- 238000013461 design Methods 0.000 claims abstract description 15
- 238000012549 training Methods 0.000 claims description 24
- 238000012423 maintenance Methods 0.000 claims description 23
- 230000001174 ascending effect Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 2
- 230000001351 cycling effect Effects 0.000 claims description 2
- 230000003252 repetitive effect Effects 0.000 claims description 2
- 238000007689 inspection Methods 0.000 abstract description 4
- 230000011664 signaling Effects 0.000 description 31
- 101100368146 Arabidopsis thaliana SYNC2 gene Proteins 0.000 description 17
- 238000001228 spectrum Methods 0.000 description 16
- 101000821257 Homo sapiens Syncoilin Proteins 0.000 description 7
- 102100021919 Syncoilin Human genes 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 5
- 239000013598 vector Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The method for establishing and holding chains between base station and users in synchronous CDMA wireless communication system includes synchronous establishment of down-chain, synchronous establishment of up-chain and choosing method for preventing collision as chain establishing. Said invented method utilizes the process for solving for correlation to obtain synchronous timing, and uses the correspondent time slot design in wireless communication command t oensure synchronous and power controlled closed-loop process, in particular, uses time slot EMPTY so as to make synchronous and power inspection more reliable, and the high-effective use method of inserted code channel ca ngreatly reduce the probability of that choosing inserted code channel by user when the system is inserted. As compared with the traditional method used in synchronous CDMA system, it is simple and easy to implement.
Description
The present invention relates to a kind of S-CDMA (SCDMA) communication system of radio communication, relate to the link establishment and the maintenance method of SCDMA communication system or rather.
In recent years, radio communication, for example wireless user loop, cellular mobile communication, personal communication service and wireless data network etc. have become a most active aspect in the communications field, the developing direction of wireless access technology has focused on code division multiple access (CDMA) system, i.e. a cdma wireless communication system that allows the multiple terminals to use similar frequency bands simultaneously in same sub-district.The coding or pseudo-noise (PN) sequence of each terminal unit utilization unified distribution send and received signal.Cdma system has many advantages, comprises signal security, high channel capacity and anti-interference or the like.But present most cdma systems that exist, for example United States Patent (USP) 5416797 and 5309474 etc. all is non-synchronization scenario, the signal that its up channel, promptly all user terminals are sent to the wireless base station is non-synchronous driving.Because the pseudo noise sequence from different user terminals can not be synchronous, the pseudo-noise sequence of different user terminals can not form quadrature each other, can form great interference (multiple access interference) each other at the spread-spectrum signal of same frequency range.This interference has not only significantly reduced channel capacity, has also increased the requirement of user terminal being carried out power control.
Obviously, in typical wireless communication system, because the terminal at diverse location place is not also known own distance between nearest base station, so setting up in same sub-district and keeping between the multiple terminals is very difficult thing synchronously, and multipath fading and occlusion effect make and set up and the difficulty more that keeps becoming synchronously.
In recent years, proposed many technical schemes, the up channel of cdma system is realized synchronously, as the method for orthogonal CDMA (OCDMA) the realization synchronization CDMA that system proposed of U.S.'s Stamford communication common carrier at this problem.But these methods are cost with the complicated hardware, exchange for expensive.And, because inevitable multipath transmisstion in the wireless communication system will destroy synchronously, be very limited to the capacity that improves cdma system synchronously so only solve.
The objective of the invention is to design a kind of foundation and maintenance method of synchronous code division multiple access communication chain, make and one or morely attempt the user terminal of access base station and to set up the terminal communicated by letter synchronous at the receiving terminal of base station with the base station, and keep in the same sub-district with the base station and set up synchronous between a plurality of terminals of communicate by letter, also can prevent from simply, effectively to occur striving when inserting code channel to swing, be the method that communication link was set up and kept to a kind of synchronous CDMA system more simple, effective and with low cost.
Method of the present invention is achieved in that the method for building up of synchronous code division multiple access communication chain may further comprise the steps:
1). descending access code sequences Design is become to contain at least the protection time slot, the training sequence time slot, be used for the time-delay deviation time slot of adjustment synchronously, the frame structure that is used for the power control time slot of power adjustment, up access code sequences Design is become to contain at least the protection time slot, synchronous 1 time slot, the frame structure of empty slot, downlink business sign indicating number sequences Design is become to contain at least the protection time slot, empty slot, be used for the time-delay deviation time slot of adjustment synchronously, be used for the frame structure of the power control time slot of power adjustment, uplink service sign indicating number sequences Design is become to contain at least the protection time slot, empty slot, the frame structure of sky/synchronous 2 time slots;
2). the base station is set up the descending access signal of communication with descending access code sequence to all terminal emissions in descending access code channel, add the training sequence of electric terminals with known general descending sign indicating number sequence search base station, identifies up access code channel and descending access code channel;
3). terminal is estimated terminal apart from the distance of base station and estimate the time and the transmitting power of time-delay emission according to the signal level of the training sequence that receives and the effective coverage information that inserts code channel, inserts request signal according to the transmitting power and the time delay of estimation with up access code sequence emission;
4). base station search uses the training signal of up access code sequence, the reference value of detected delay volume and default is compared back acquisition time-delay deviation, the signal power level and the existing signal level that receive are compared back acquisition power control signal, and the affirmation signal that in descending access code channel, inserts with descending access code sequence transmitting channel;
5). terminal is adjusted launch time and power level according to the time-delay deviation signal and the power control signal of the descending sign indicating number sequence that receives, according to the sign indicating number Taoist monastic name of appointment, with the initialize signal of up sign indicating number sequence transmitting chain;
The maintenance method of described synchronous code division multiple access communication chain is: the sky in the terminal of the designated code Taoist monastic name industry affair thereon code channel/synchronous 2 time slots, with synchronous 2 symbols of its uplink service sign indicating number sequence period ground emission, the base station is by calculating correlation and search peak, determine the time of advent of these terminal synchronizes 2 signals, and go out the uplink synchronous error of terminal according to peak value and Time Calculation, in next downlink business code channel, send this time delay deviation signal, adjust maintenance launch time synchronously for terminal with same downlink business sign indicating number sequence.
Described terminal is in sky/synchronous 2 time slots of uplink service code channel, have only one or several specific terminal in this present frame, can launch synchronous 2 signals, other terminal of communicating by letter can only be in the empty slot of not launching, and synchronous 2 signals of the terminal of having only this one or several appointment can be received by the base station.
Protection time slot between protection time slot between described up access code sequence and descending access code sequence and described uplink service sign indicating number sequence and downlink business sign indicating number sequence is greater than switching time of analog circuit with greater than the ratio of the light velocity in the maximum radius of 2 times terminal and ultimate range between the base station or sub-district and the atmosphere.
Described up channel and down channel are the time to go up nonoverlapping uplink and downlink time slot, can be identical on frequency range, and ascending time slot and descending time slot partner, in time repetitive cycling.
Training sequence time slot and the empty slot EMPTY in the downlink business code channel that described base station down inserts in the code channel are overlapping in time, promptly in this descending time slot, the base station is transmitting training sequence in its descending access code channel only, and other professional code channel is not all launched in the crack at this moment; Described terminal in up access code channel synchronous 1 time slot and the empty slot in the uplink service code channel be overlapping in time, promptly in this ascending time slot, the terminal of having only requirement to insert is just launched synchronous 1 signal, and this time slot of other terminal industry affair thereon code channel of communicating by letter is not launched.
Training sequence in the described descending access code channel is a theaomni-directional transmission, has the level higher than other signals.
The method for building up of described link also comprises the error detection occurs of timing offset and power control information and corrigendum.
The method for building up of described link also comprises the detection to the terminal unique individual's number pid information that inserts request signal and admission confirm signal.
The method for building up of described link also comprises inserting the error detection occurs and the corrigendum of request signal, admission confirm signal and link initialize signal.
The base station link assurance signal is that next descending time slot after the base station receives the access request signal of ascending time slot carries out in the described step 4).
In the described step 3), each terminal is that the frame number in last 5 bits of its personal number and descending access code sequence is when identical, just insert request signal in the ascending time slot emission, when access failure, behind the terminal random delay certain hour again repeat its transmission insert request signal.
In the described step 3), the up delay value when specific fixed terminal writes down a preceding success communication, and when inserting, use this value as the initial time delay value next time.
Described detection inserts the training sequence of request signal, also further comprise: with the precision of a chip period part, use up access code sequence to calculate the relevant peaks of the signal that receives in the base station, find the relevant peaks that surpasses predetermined threshold, with corresponding time of confirming numerical value as the time of advent; If it is in the predetermined scope at center that the numerical value of any time of advent was in the reference time, to choose near that time numerical value of reference time desired value as the time of advent, its corresponding relevant peaks is as its power valuation; If the numerical value of neither one time of advent drops in the above-mentioned preset range, then choose have maximum correlation peak that time of advent numerical value as the desired value time of advent, its corresponding relevant peaks is as the target power valuation; If there is not above-mentioned time of advent of numerical value, getting the above-mentioned predetermined reference time is the target numerical value time of advent, and getting predetermined reference power is the target power valuation; Described calculating timing offset and power control range, wherein timing offset is a desired value and described reference time the poor time of advent, described power control range is the ratio of target power valuation and reference power; The information of described timing offset and power control range is all launched in descending access signal, link assurance signal.
Method of the present invention also further comprises and prevents from the method for swinging to occur striving in inserting code channel, comprising:
1). the busy not busy B/I time slot of design in the frame structure of descending access code channel, in the base station all professional code channels all occupied or this insert code channel handling show when inserting busy, this time slot that receives descending access code channel when terminal shows when busy, have only superuser or special service number (as 119,110,120 etc.) call out can be by force thereon row insert that application inserts by force in the code channel, other terminal that is in wait state all can not be launched up access and be asked signal for instructions;
2). uplink and downlink insert the only access of processing terminal of code channel, and the transmission of process user authentication and caller in the professional code channel that is distributed, called phone number promptly inserted code channel and be in idle condition in most times, made to strive to swing not to be prone to;
3). user terminal is carried out packet transaction, and the base station all can only be carried out in the specific uplink and downlink frame of grouping the calling of user terminal and the access request of terminal, further reduces and strives the probability of swinging appearance;
4). occur striving and swing the base station can't offer an explanation the affirmation signal that the up access request signal received and terminal can't obtain to insert the time, terminal is sent the request of access once more with random delay after a period of time.Because the random delay difference of different terminals, swing sending when inserting request to strive next time with regard to unlikely formation.
In this SCDMA system, all user terminals are with mutually orthogonal PN sequence spread spectrum, and synchronous driving, and promptly the PN sequence arrives the base station simultaneously.Interference between the user obviously reduces like this, can increase power system capacity and reduce the requirement that power is controlled.The present invention uses simultaneously multiunit antenna array and relevant signal processing technology (see another application for a patent for invention case of the applicant " the time division SCDMA wireless communication system with smart antenna; Chinese patent application numbers 97104039.7) in the base station; receive and the emission of downstream signal from the base station to the terminal thereby greatly improved from the upward signal of terminal to base station, has solved the problem of multipath transmisstion.The up channel of SCDMA system is synchronous, just can give full play to the orthogonality effect of each code channel.
Further specify technology of the present invention below in conjunction with embodiment and accompanying drawing.
Fig. 1. the wireless communication system architecture schematic diagram of forming by a base station and a plurality of terminal
Fig. 2. the antenna array subsystem structural representation of base station among Fig. 1
Fig. 3. insert the Pareto diagram of code channel uplink and downlink timeslot symbol
Fig. 4. the Pareto diagram of professional code channel uplink and downlink timeslot symbol
Fig. 5. the scheme schematic diagram of process is set up in a communication of attempting the terminal of access base station
Fig. 6. set up the synchronous scheme schematic diagram that keeps of the terminal channel of communicating by letter for one with the base station
Fig. 7. go into the operational flowchart of process at terminal one side joint
Fig. 8. one side joint is gone into the operational flowchart of process in the base station
Referring to Fig. 1, one comprises a base station and a plurality of terminal with the synchronization CDMA wireless communication system time-division diplex operation, that have smart antenna shown in the figure, and the base station is furnished with the CDMA antenna array system.Its antenna array has been realized the function of smart antenna under the support of baseband digital signal processor, can aim at antenna lobe the different terminals of different azimuth effectively according to the requirement that transmits and receives.The base station is at first time slot emission spread-spectrum signal, and this time slot is descending time slot DTS.At the spread-spectrum signal that second time slot receives self terminal to launch, this time slot is called capable time slot UTS.Therefore, terminal transmits at ascending time slot UTS, in descending time slot DTS received signal.An ascending time slot and a descending time slot constitute one group, and constantly repeat in time.The time width of UTS or DTS should be provided with enough for a short time, does not have significant change to guarantee in the cycle of UTS or DTS radio frequency or microwave propagation characteristic.Because this wireless communication system is to use CDMA scheme, each UTS comprises many code channels, and shared same carrier wave.Set up when communicating by letter between terminal and the base station, all launch by the spread-spectrum signal of a PN sign indicating number sequence spread spectrum.Equally, each DTS also has a plurality of code channels, from the base station to transmitting the multichannel downstream signal with terminal base station communication or that called out by the base station.For the upstream or downstream signal, all code channels are shared same carrier wave simultaneously.In these common N bar code channels, there is one to be to insert code channel, all the other N-1 bars are professional code channels, N is a spread spectrum coefficient.Signal with general up PN sign indicating number spread spectrum is used to insert code channel, then is used for professional code channel with the signal of other quadratures PN sign indicating number spread spectrum.Each terminal shown in the figure has a radio-frequency (RF) transceiver and a digital signal processor, and it can finish spread spectrum, despreading at least, modulate, separate and be in harmonious proportion function such as signalling analysis.
Referring to Fig. 2, a typical C DMA antenna array subsystem is shown.Have a plurality of antenna 20A, 20B, 20C and 20D, and be connected to a plurality of radio set 21A, 21B, 21C and 21D on these antenna.The radiating portion of each transceiver is modulated to the radio frequency or the microwave of appointment to baseband signal, is amplified to the certain power level simultaneously, and the receiving unit of each transceiver amplifies radio frequency or microwave signal and also demodulates initial baseband signal.The A/D converter 23A, 23B, 23C and the 23D that are connected with each transceiver are transformed into digital signal corresponding to analog signal, send digital signal processor 24.The D/A converter 22A, 22B, 22C and the 22D that are connected with each transceiver become corresponding analog signal to the digital signal conversion from digital signal processor 24, send respective transceivers.Parts 24 are a digital signal processor or a plurality of digital signal processor, comprise baseband circuits such as frequency multiplier, despreader, modulator, demodulator and spatial processor, can finish desired signal processing, as functions such as spread spectrum, despreading, modulation and demodulation.
Referring to Fig. 3, this figure has illustrated the detailed arrangement of all symbols in access code channel DTS (30) and UTS (31) frame structure, and DTS and UTS constitute a pair of and separate in time.Owing to adopted high performance differential quadrature phase keying (DQPSK) DQPSK rf modulations scheme, so each symbol is made of 2 bits.If data transfer rate is higher, can also use other modulation scheme.As, 8PSK or 16QAM modulation.The cycle of each DTS frame shown in Figure 3 is from protection time slot 32, symbol Sgd, the purpose that designs this protection be for fear of because synchronously or the analog switch time cause that DTS and adjacent UTS's is overlapping.No matter this is because for base station or terminal, transmitting-receiving and the conversion of sending out between receiving need certain hour.Though the signal of all terminals will arrive the base station at synchronization in synchronous CDMA system, a certain terminal when beginning to attempt access base station, and can not with with the terminal synchronizes of base station communication.If there is not guard time, the signal propagation long period that terminal far away is sent from the base station just arrives the base station, might exceed the limit of a UTS, makes the base station can't receive the beginning part of upward signal.
Followed by the protection time slot is descending training symbol St (33), it is complete 1 that these symbols are actually, promptly 11, and by the known descending pseudo noise code spread spectrum of terminal so that terminal recognition and synchronously.The Sf symbol indicates present frame number (34), and frame number (34) is the sequence number of each subframe in the multi-frame, and the sum M of subframe is predetermined in the multi-frame.Like this frame number (34) always 0 and M-1 between, each new subframe increases progressively 1, arrives M and just returns zero.The Sc1 symbol is used for expression control signaling packet 35, and this bag is used for sending control signaling to terminal from the base station, and this information may be made up of a control signaling packet or a plurality of control signaling packet, control signaling packet EDC error detection and correction sign indicating number, and promptly cyclic redundancy code CRC protects.This packets of information also can be used to transmit broadcast message, as geographical position of sign, paging, short message, channel reservation, time, weather and the base station of the coverage of base station, base station etc.Time-delay deviation 36 is used the Sg1 symbol, and it is synchronous to be used for up access.The Sp1 symbol is used in power control 37, is used for the up transmitting power control that accesses terminal.In addition, also have the symbol Sb1 (45) of a busy not busy indication, be used to indicate and insert the busy-idle condition of code channel and whole service in base station code channel this moment.These symbols may also comprise the CRC check position, to strengthen reliability.
Fig. 3 also shows the symbol arrangement that UTS inserts code channel.Total number of symbols that UTS comprises and DTS as much, these symbols by a kind of known be the general up PN sign indicating number sequence spread spectrums of all terminals.Equally, the UTS frame began with protection time slot 38, symbol Sgu cycle.38 pairs of time slots of protection are extremely important synchronously; when a demanding terminal access base station; it does not also know distance between own and base station; do not know the synchronism deviation of signal when arriving the base station that it is launched yet; if there is not guard time in the UTS, just can't postpones near terminal and shift to an earlier date the launch time of terminal far away.Say that exactly the guard time between UTS and the DTS must also be greater than 2D/C greater than the switching time of analog circuit, D is the ultimate range between terminal and base station or the maximum radius of sub-district here, and C is the light velocity in the atmosphere.For making things convenient for system works, fix at base station side Sgu and Sgd, also be to reach necessary synchronously, for this reason, must constantly adjust Sgu and Sgd according to the Sg1 numerical value among the DTS by each terminal.Equally, in case the transmission of terminal is set up synchronously, it just can promptly calculate the distance of terminal from the base station in Sgu and Sgd in guard time.Followed by guard time is s1 symbol SYNC1 (39).Equally, these symbols are complete 1 symbols.Use S2 symbol EMPTY (40) then, up access code channel does not have the signal emission during this symbol.SYNC1 symbol and EMPTY symbol will play a significant role in access operation.Control signaling packet 41 usefulness symbol Sc1 represent that its control information can be made up of a control signaling packet or a plurality of control signaling packet, comprise inserting application signal, terminal identity identification PID and other useful information.Because do not have power control and synchronous control signal in the UTS.Just can reserve a period of time and give reservation symbol Sr1 (42), wait until system designer and use.
Referring to Fig. 4, the arrangement of symbol in professional code channel UTS (31) shown in the figure and DTS (30) frame structure.The DTS of each professional code channel is the same with the DTS that inserts code channel, and also design has protection time slot 32.And then be EMPTY, symbol St (403), not emission during this period.That is to say that in the time slot of St symbol period training sequence symbols is only transmitted in the base station in inserting code channel.EMPTY symbol back is used for time-delay deviation symbol Ss2 (404), power control character Sp2 (405) and the speech speed symbol Svr (406) of adjustment synchronously, and this symbol is used for rate changeable vocoder.These symbols are protected with redundant code CRC, to guarantee correct reception.The symbolic number of control signaling Sc2 (407) is arranged lessly, and control signaling packet is with the transmission of the Sc2 symbol of a plurality of frames.Sv symbol 408 is used for service data information, and they can be voice compression coding or data.
Fig. 4 gives the arrangement of uplink service code channel UTS symbol.In protection time slot symbol Sgu 38 back are EMPTY symbol S1 (420), and during this period of time each communication terminal is not all launched, the interference when minimizing is set up uplink synchronous to accessing terminal.Followed by the symbol S2 (411) that is to use SYNC2/EMPTY of EMPTY symbol S1, as long as it is not empty as SYNC1, the emission all "1"s signal.Concerning a certain specific terminal of communicating by letter, it will periodically launch the SYNC2 symbol according to frame number.As, terminal of communicating by letter, it will be at frame number that frame emission SYNC2 symbol identical with its yard Taoist monastic name, and does not launch (EMPTY) in other frame.In other words, have only a terminal to launch in cycle at SYNC2, interference level significantly reduced when the base station received, and the base station obtains the time of advent of this particular terminal signal easily, and launch the time-delay deviation signal that is used for adjusting synchronously and give this terminal, to keep the synchronous of terminal.During this period, the base station that smart antenna is housed can obtain the space vector or the matrix of these terminals better, is used to optimize the antenna beam figuration of up channel, to having lost the later terminal particular importance of uplink synchronous.In the case, this yard sequence may be non-orthogonal with other yard sequence, and owing to the interference from same other code channel of channel, the base station is the despreading upward signal well.In like manner, the base station can not correctly estimate spatial character vector sum matrix, can not be to the antenna beam of up-downgoing channel figuration exactly.The problem that down channel occurs may make terminal can not adjust the launch time of oneself, and up channel can't be obtained synchronously, finally causes communication disruption.Because the present invention is in each frame, have only a terminal can launch SYNC2 symbol 411, receive the base station this moment only little interference, although lose synchronously, but the base station still can obtain the time of advent of this terminal signaling, obtain spatial signature vectors and matrix, can effectively carry out the antenna beam figuration of up-downgoing channel.In like manner,, just can estimate the power of terminal exactly, realize closed power control because common-channel interference is less.Followed by the SYNC2 symbol is speech (vocoder) speed symbol Svr (412), for cdma system, it is very important detecting voice activation and adjusting vocoder rate, when speech activity is low, can reduce transmitting power, reduce signal rate, effectively reduce co-channel interference other terminal.Vocoder rate information is necessary for decompression.Vocoder rate symbol back is control signaling symbols Sc2 (413), is used to transmit space signaling and control information from terminal to base station.Because in professional code channel, the business information amount is more a lot of than access procedure, and Sc2 is shorter and can not be very long than Sc1, and the Sc2 of same available a plurality of UTS frames synthesizes aforesaid control signaling packet.Be business datum symbol Sv (414) at last.Owing in UTS, do not have power control and synchronizing symbol, can keep some symbols and be provided with back definition, the i.e. position of Sr symbol 415.
The process of link is set up and kept to Fig. 5 to Fig. 8 full-time instruction frame structure.
Referring to Fig. 5, the process of setting up of link is shown.When terminal power up and attempt to insert through registration and during nearest base station, at first use the training sequence of known general descending sign indicating number sequence search base station, identify UTS and DTS.Because the launching electrical level of base station training sequence is apparently higher than other signal, and do not have other signal emission during this period again, therefore find that this sequence is not difficult.In case the acquisition training sequence just can be determined UTS and UDS.When this terminal therewith DTS synchronously and follow the tracks of go up training sequence after, just can decode and error correction to the symbol of access code channel.Terminal is correctly decoded to these information, checks the identity code PID whether this machine is arranged in the control signaling, determines whether the base station is calling out oneself.
Terminal can also be handled other useful information that inserts in the code channel downstream signal, as time, weather and short message etc.If this terminal is called out in the base station or this terminal attempts to insert this base station, and busy period crack Sb1 (45) end in the descending access code channel shows busyly, and terminal is modulated with regard to the general up PN sign indicating number of available another kind and sent the access request signal.Channel busy is that the information that code channel is busy or professional code channel has been taken is inserted to this base station that terminal is sent in the base station.Show when busy to have only superuser or special calling can call out access by force as 110,119,120 etc. at the busy period of DTS crack Sb1 (45).
Although, this moment, this terminal can receive the synchronizing signal of base station, but owing to do not know distance own and terminal room, therefore still do not know when launch, also can't be in the base station one side set up the terminal of communicating by letter with other and obtained synchronously (error is the part in chip signal cycle).So this terminal also must obtain uplink synchronous.This terminal at first detects the intensity of the training sequence signal that receives, and estimates oneself distance to the base station roughly according to the active zone information that inserts code channel.This terminal begins emission after through regular hour time-delay then, attempt in the base station one side-draw must with other terminal of communicating by letter synchronously.Mean radius as a sub-district is 10 kilometers, and the level of constant power will be launched according to the requirement that this sub-district covers in the base station.If do not have multipath and occlusion effect, terminal can roughly estimate own distance apart from the base station according to the signal strength signal intensity of receiving, if be 2 kilometers.If the reference distance that sets in advance is 5 kilometers because propagation delay, the terminal far away from 2 kilometers places need will launch time from time started of former UTS be reference distance time corresponding time-delay 3 * 10
3/ (3 * 10
8)=10 μ s.
It is inaccurate that yet this open loop is estimated, all the more so under the multipath interference and the situation of blocking especially.The UTS symbol that this terminal is modulated with the PN sign indicating number with the time-delay emission of estimating above, as shown in Figure 3, EMPTY symbol S2 after S1 stops emission, being preserved for the symbol of SYNC2, and then transmits the information symbol of indication PID and other sets up the necessary information of channel.S1+S2 symbol in first UTS that this moment, the base station received is used for synchronous.Most during this period terminals of communicating by letter do not transmit.The base station in first S1 symbolic range, with the despreading of public up PN sign indicating number and ask relevant, search SYNC1 symbol.In case the base station detects output or finds above the thresholding correlation peak, after certain delay, in the place that detects peak value with the symbol of identical PN sign indicating number despreading S2 symbol back remainder.If remaining information coding is correct with CRC check or with other method inspection, the control signal that the base station just will be inserted to this terminal transmitting channel in next DTS.Comprise the control signaling packet of the information such as sign indicating number Taoist monastic name that have detectable PID and distribution in this control signal, reached interior synchronous adjustment and the power control signal of DTS as shown in Figure 3.The base station compares the reference value of detected amount of delay and default, as comparing in the time of advent that 1/2 place of radius of society transmits with terminal, thereby draws synchronous adjustment information.The power level of this signal that the base station will receive and the level of other existing signal compare and obtain power control information.For antenna system, signal power is the synthetic of all antenna powers, in case the terminal unit that inserts is received these signals in DTS, it just knows that the base station has obtained its access application signal, just stops to insert code channel transmission access application signal.It jumps into professional code channel according to the sign indicating number Taoist monastic name that receives at once, according to the synchronous and power control signal of receiving, adjusts launch time and power level respectively.Surpassed predefined threshold value until launch time and power level.
Said method is used in the overall process of adjusting launch time and power level, if the base station can't detect the UTS of a certain terminal with the delay value of appointment, it just ignores this terminal immediately.Access request signal to the terminal that can correctly solve UTS sends downlink information.If the base station can't correctly solve any control signaling packet, it is the amount of delay that is consistent with maximal correlation and despreading of reservation only just, and in next DTS, send it, each terminal writes down synchronous adjustment and power control information at any time, adjust oneself launch time and transmitting power, in next UTS, send the access request signal once more.
A terminal must be considered one of following situation after sending the access request signal:
1. if the control signaling packet can correctly be received, comprised control signal that channel inserts and therewith terminal be complementary, it just knows that the base station has correctly received its access request signal, adjust launch time and power level according to synchronous adjustment that correctly receives and power control signal, and, send initializing signal at this professional code channel with the sign indicating number Taoist monastic name in the descending control signaling bag.
2. if the control signaling packet can correctly be received by this terminal, comprised the control signal that channel inserts, but PID and this terminal do not match, and this terminal will be abandoned this control signaling packet, and use in another UTS with last time identical launch time and power level transmission and insert request signal.
3. if the controlling packet that correctly receives is not the channel access signal at this terminal, this terminal will be adjusted launch time and power level respectively according to launch time that correctly receives and power level, and launches the access request signal again at next frame UTS.
4., after random wait is counted frame, launch the access request signal once more with original launch time and power level if terminal detects any mistake in the downstream signal frame that receives.
5. if the busy not busy position in the descending access signal frame that receives of terminal shows busy, then have only superuser or calling special service number terminal can apply for inserting, the terminal that other end is inserted all can not be launched any signal, can not access base station after the operation more than if terminal is carried out in certain hour cycle such as M frame, enter holding state with regard to directly withdrawing from this process
The professional code channel that is indicated by the sign indicating number Taoist monastic name is opened immediately in the base station after having sent the channel incoming control signal that inserts for terminal, and waits for correct receive channel initializing signal and beginning handshake procedure, comprises user terminal identity identification and receiving dialed number.Enter professional code channel after a period of time in this terminal, if channel is not still set up, the base station just sends an interrupt signal and regains this professional code channel to this terminal.Illustrated that more than the SCDMA system sets up the complete procedure of channel.
Referring to Fig. 6, diagram has been described the base station and has been kept a synchronous scheme of communication channel with the terminal room of communicating by letter.In synchronous CDMA communications system, keeping the communication most important work is keep uplink code channel synchronous.
Among the figure, when frame number equaled yard Taoist monastic name, using the terminal of this yard Taoist monastic name just periodically to launch S2 was the SYNC2 symbol.Because during the emission of SYNC2 symbol, generally have only a unique signal to occur, this disturbs very little constantly, and the base station is easy to determine the time of advent of this terminal signaling by calculating correlation and search peak.According to peak value and time, just can calculate the uplink synchronous error of terminal, and send corresponding synchronous adjustment signal at the descending code channel of the next one, make terminal can correctly adjust launch time, guarantee reliable synchronously.In the cdma system of an arrowband,, therefore do not need to distribute many bits to synchronous conditioning signal because the sense cycle of the relative terminal of synchronism deviation that local frequency deviation or land translational speed are caused is very little.
And wideband CDMA system, along with the increase of channel capacity and increasing of code channel, each terminal is kept uplink synchronous and is kept the frequency of operation to reduce, for the terminal of following the tracks of fast moving and having clock to suddenly change, and just need be with higher frequency emission SYNC2 signal.In the case, can utilize the descending control signaling bag of professional code channel to go to control the terminal of communicating by letter, to increase the emission frequency of SYNC2 signal.If the base station requires the terminal of an appointment to double to launch the SYNC2 signal in the time of M frame, when frame number satisfy nf=nc or nc=mod (nc+M/2, M), terminal emission SYNC2 signal.Wherein nf is present frame number, and nc is a yard Taoist monastic name, and M is total code channel number, is even number, and mod (x) is the mod function of x.In the case, the base station may be received the SYNC2 signal that two different terminals are sent simultaneously, but because these two SYNC2 signals are respectively by different PN sign indicating number sequence spread spectrums, so the base station still can determine the time of two groups of SYNC2 signals arrival respectively, and two terminals are sent synchronous conditioning signal respectively.By exchange control signaling packet between base station and terminal, make the maintenance channel synchronization.
No matter to the base station still to terminal, if within a certain period of time, the CRC check in the control signaling packet is always found mistake, or the base station lost up channel, just needs to rebuild channel.Can initiate by the base station, require terminal to send up access signaling, realize inserting again.Promptly require terminal to send UTS, contain SYNC1 signal and control signaling packet,, just adopt the method for channel foundation to handle it and former code channel is distributed to it if the base station has correctly received the access request control signaling packet of this terminal at the access code channel.Also can initiate, require link re-establishment, correctly receive this request back in the base station and send the link re-establishment instruction, and on the access code channel, rebuild link by aforementioned process to this terminal by terminal.In a longer time, if the link re-establishment failure, professional code channel will be regained in the base station, stop the process of reconstruction of above-mentioned link.
For the smart antenna array 1 system, also can accurately estimate the spatial signature vectors and the matrix of this terminal at the SYNC2 time slot, be used for up channel antenna beam figuration subsequently.Because use the TDD scheme, utilize these spatial signature vectors and matrix also to finish the figuration of down channel antenna beam simultaneously.
Referring to Fig. 7, diagram has been introduced the process of setting up channel in terminal one side.Terminal is implementation 800 at first, promptly searches for training sequence in DTS.According to the time of arrival (toa) that from process 800, calculates, obtain down-going synchronous, this terminal is at the downstream signal of process 801 despreading remainders and solve symbol.Implementation 802 then, comprise CRC check and analysis to the back symbol of decoding.If by CRC check, find PID and terminal PID coupling in the call information, terminal then enters process 803, otherwise enters process 811, checks whether the user of this terminal has channel request.If no, the terminal return course 800; If application is arranged, the then busy spare time indication among the inspection DTS in process 845 is shown busy or superuser or calling special service if the end is seen, all return course 803, otherwise equal return course 800.
In process 803, according to the valuation of downstream signal power and the base station power level information that from descending access signal, obtains, terminal estimates distance, skew launch time and the transmitting power apart from the base station, attempt to make the signal of oneself can arrive the base station simultaneously, and one side have the power level identical with other terminal of communicating by letter in the base station to make oneself with the signal of other terminal of communicating by letter.The terminal implementation 804 then, and maximum times m=M and implementation 805 that uplink synchronous is soundd out are set, and promptly send in a UTS with delivery time skew of estimating and power and insert request signal.After sending the access request signal, terminal receives downstream signal immediately, and carries out CRC check in the data of 806 pairs of receptions of process, if verification is passed through, and this signal is the control signal that channel inserts, and promptly enters process 807, checks whether the PID that receives is consistent with oneself.CRC check in the process 806 then implementation 813 of makeing mistakes is carried out CRC check to power control of receiving and the synchronous conditioning signal that feeds back.If correct, just enter process 814, and adjust launch time and power level according to correct data; Otherwise terminal keeps former launch time and power level is skipped process 814.If find that in process 807 PID is inconsistent, also will skip process 813 and 814, enter process 815.If the PID that in process 807, find to receive and oneself being complementary, terminal just knows that the channel incoming control signal of base station issued oneself, implementation 808 then, i.e. correctly whether power control that inspection is received and synchronous adjustment symbol (as using CRC check).If correctly then enter process 809 and adjust launch time and power level according to correct data.If incorrectly just keep former data to skip 809 entering 810, press the PN sign indicating number spread spectrum of designated code Taoist monastic name in the channel incoming control signal, send the channel initialization signal.
Behind access failure, terminal is in process 815, and variable n time of delay at random of probability assignments according to predetermined enters deferring procedure 816, and searching downlink inserts signal and control signal is decoded.In process 816, do not make an immediate response even terminal has been received the call signal of base station yet, but wait for whether this stochastic variable n becomes 0.If 0, terminal enters process 818, sends another application and insert signal in next UTS.Otherwise implementation 830, i.e. n=n-1 and return course 816. Process 817 and 830 means that terminal will wait for randomly that the number frame launches another later on again and insert request signal, to reduce the channel contention with other terminal.After the process 817, terminal implementation 818 will insert number of times and subtract 1, and m=m-1 enters process 819 again and compares.If the result is 0, illustrate that terminal launched M secondary channel request signal, also can't connecting system, then terminal withdraws from access procedure in process 800 and returns holding state, communicates by letter otherwise continue to attempt to set up with the base station.
Referring to Fig. 8, the channel that base station one side is shown is set up process.In process 900, the base station at first puts 0 to power control and the synchronous symbol of adjusting.In process 902, the base station is promptly carried out correlation computations at the SYNC1 time slot with known up access code preface exactly searching for the SYNC1 symbol in the corresponding time with coverage.In next process 904, correlation is observed greater than predetermined thresholding in the base station whether, and this threshold value comprises the noise level of calculating from received signal, relevant time precision etc.Relevant time precision generally is the part in spread-spectrum code chip cycle, as 1/8 chip period.After obtaining correlation, the base station checks at first whether correlation is concentrated within the predetermined time, i.e. the time of half-chip.If correct, the base station is skipped process 906 and is entered process 908.Otherwise compare in 906 usefulness maximum related value and thresholding the base station.If greater than thresholding, the base station just can enter process 908, if less than thresholding then enter process 920.
In process 908, according to correlation and correlation time process 904 or 906, the synchronous adjustment and the power control character of this upward signal calculated in the base station.In the process of closelying follow 910, whether the base station is checked operational idle code channel.If no, then that the busy not busy position of DTS is busy and enter process 918, whole and power control character sends the channel busy signal in company with step.If idle channel arranged then enter process 912, promptly with the control signaling packet decoding of temporal information to receiving of process 908.In process 914, CRC check is further made to decoding symbols in the base station.If verification is passed through, solve the access request signal, enter process 916, in next DTS, together send the control signal that channel inserts with power control and the synchronous symbol of adjusting.Otherwise process 920 is got back in the base station, sends the control signaling packet on upper strata with power control and the synchronous symbol of adjusting.After the process 920,918 or 916, starting point 900 is got back in the base station.At this, if the base station receives is not channel request signal, short message signal in this way, a recall signal then only need be sent in the base station, and the control signal that the channel of not bothering to see me out inserts.
By the explanation of Fig. 5 to Fig. 8 as can be known, the efficient that the present invention inserts code channel is very high.When all terminals insert in application, as long as be in the scope of proper communication, promptly in the area of coverage of base station, general needs several TDD cycles just can obtain the DTS of admission confirm, the control signal that i.e. communication inserts, and change the initialization procedure that professional code channel goes to finish access immediately over to.In addition, in inserting code channel, design the busy period crack, made that the terminal that is inserting is unlikely to be subjected to the interference that other requirement accesses terminal, more guaranteed the quick access that superuser and special service are called out.
Above method can be in a base station only inserts code channel with one be finished, and this code channel generally is in idle condition, also can be used for launching various broadcast messages and short message, improves power system capacity and efficient greatly.
Channel in time division duplex smart antenna synchronous CDMA system of the present invention is set up and the maintenance method, can further expand and be used for FDD system, single antenna or fan-shaped lobe antenna system, FDMA and TDMA wireless communication system, in addition be used for wired communication system, to resemble the cable modulator medium.
Claims (14)
1. the foundation of a synchronous code division multiple access communication chain and maintenance method is characterized in that the method for building up of described synchronous code division multiple access communication chain may further comprise the steps:
1). descending access code sequences Design is become to contain at least the protection time slot, the training sequence time slot, be used for the time-delay deviation time slot of adjustment synchronously, the frame structure that is used for the power control time slot of power adjustment, up access code sequences Design is become to contain at least the protection time slot, synchronous 1 time slot, the frame structure of empty slot, downlink business sign indicating number sequences Design is become to contain at least the protection time slot, empty slot, be used for the time-delay deviation time slot of adjustment synchronously, be used for the frame structure of the power control time slot of power adjustment, uplink service sign indicating number sequences Design is become to contain at least the protection time slot, empty slot, the frame structure of sky/synchronous 2 time slots;
2). the base station is set up the descending access signal of communication with descending access code sequence to all terminal emissions in descending access code channel, add the training sequence of electric terminals with known general descending sign indicating number sequence search base station, identifies up access code channel and descending access code channel;
3). terminal is estimated terminal apart from the distance of base station and estimate the time and the transmitting power of time-delay emission according to the signal level of the training sequence that receives and the effective coverage information that inserts code channel, inserts request signal according to the transmitting power and the time delay of estimation with up access code sequence emission;
4). base station search uses the training signal of up access code sequence, the reference value of detected delay volume and default is compared back acquisition time-delay deviation, the signal power level and the existing signal level that receive are compared back acquisition power control signal, and the affirmation signal that in descending access code channel, inserts with descending access code sequence transmitting channel;
5). terminal is adjusted launch time and power level according to the time-delay deviation signal and the power control signal of the descending sign indicating number sequence that receives, according to the sign indicating number Taoist monastic name of appointment, with the initialize signal of up sign indicating number sequence transmitting chain;
The maintenance method of described synchronous code division multiple access communication chain is: the sky in the terminal of the designated code Taoist monastic name industry affair thereon code channel/synchronous 2 time slots, with synchronous 2 symbols of its uplink service sign indicating number sequence period ground emission, the base station is by calculating correlation and search peak, determine the time of advent of these terminal synchronizes 2 signals, and go out the uplink synchronous error of terminal according to peak value and Time Calculation, in next downlink business code channel, send this time delay deviation signal, adjust maintenance launch time synchronously for terminal with same downlink business sign indicating number sequence.
2. the foundation of synchronous code division multiple access communication chain according to claim 1 and maintenance method is characterized in that: the protection time slot between protection time slot between described up access code sequence and descending access code sequence and described uplink service sign indicating number sequence and downlink business sign indicating number sequence is greater than switching time of analog circuit with greater than the ratio of the light velocity in the maximum radius of 2 times terminal and ultimate range between the base station or sub-district and the atmosphere.
3. the foundation of synchronous code division multiple access communication chain according to claim 1 and maintenance method, it is characterized in that: described up channel and down channel are the time to go up nonoverlapping uplink and downlink time slot, can be identical on frequency range, ascending time slot and descending time slot partner, in time repetitive cycling.
4. the foundation of synchronous code division multiple access communication chain according to claim 1 and maintenance method, it is characterized in that: the training sequence in the described descending access code channel is a theaomni-directional transmission, has the level higher than other signals.
5. the foundation of synchronous code division multiple access communication chain according to claim 1 and maintenance method, it is characterized in that: the method for building up of described link also comprises the error detection occurs of timing offset and power control information and corrigendum.
6. the foundation of synchronous code division multiple access communication chain according to claim 1 and maintenance method is characterized in that: the method for building up of described link also comprises the detection to the terminal unique individual's number pid information that inserts request signal and admission confirm signal.
7. the foundation of synchronous code division multiple access communication chain according to claim 1 and maintenance method is characterized in that: the method for building up of described link also comprises inserting the error detection occurs and the corrigendum of request signal, admission confirm signal and link initialize signal.
8. the foundation of synchronous code division multiple access communication chain according to claim 1 and maintenance method is characterized in that: the base station link assurance signal is that next descending time slot after the base station receives the access request signal of ascending time slot carries out in the described step 4).
9. the foundation of synchronous code division multiple access communication chain according to claim 1 and maintenance method, it is characterized in that: in the described step 3), each terminal is that the frame number in last 5 bits of its personal number and descending access code sequence is when identical, just insert request signal in the ascending time slot emission, when access failure, behind the terminal random delay certain hour again repeat its transmission insert request signal.
10. the foundation of synchronous code division multiple access communication chain according to claim 1 and maintenance method, it is characterized in that: in the described step 3), up delay value when specific fixed terminal writes down a preceding success communication, and when inserting, use this value as the initial time delay value next time.
11. the foundation of synchronous code division multiple access communication chain according to claim 1 and maintenance method, it is characterized in that described detection inserts the training sequence of request signal, also further comprise: with the precision of a chip period part, use up access code sequence to calculate the relevant peaks of the signal that receives in the base station, find the relevant peaks that surpasses predetermined threshold, with corresponding time of confirming numerical value as the time of advent; If it is in the predetermined scope at center that the numerical value of any time of advent was in the reference time, to choose near that time numerical value of reference time desired value as the time of advent, its corresponding relevant peaks is as its power valuation; If the numerical value of neither one time of advent drops in the above-mentioned preset range, then choose have maximum correlation peak that time of advent numerical value as the desired value time of advent, its corresponding relevant peaks is as the target power valuation; If there is not above-mentioned time of advent of numerical value, getting the above-mentioned predetermined reference time is the target numerical value time of advent, and getting predetermined reference power is the target power valuation; Described calculating timing offset and power control range, wherein timing offset is a desired value and described reference time the poor time of advent, described power control range is the ratio of target power valuation and reference power; The information of described timing offset and power control range is all launched in descending access signal, link assurance signal.
12. the foundation of synchronous code division multiple access communication chain according to claim 1 and maintenance method, it is characterized in that: described terminal is in sky/synchronous 2 time slots of uplink service code channel, have only one or several specific terminal in this present frame, can launch synchronous 2 signals, other terminal of communicating by letter can only be in the empty slot of not launching, and synchronous 2 signals of the terminal of having only this one or several appointment can be received by the base station.
13. the foundation of synchronous code division multiple access communication chain according to claim 1 and maintenance method, it is characterized in that: training sequence time slot and the empty slot EMPTY in the downlink business code channel that described base station down inserts in the code channel are overlapping in time, promptly in this descending time slot, the base station is transmitting training sequence in its descending access code channel only, and other professional code channel is not all launched in the crack at this moment; Described terminal in up access code channel synchronous 1 time slot and the empty slot in the uplink service code channel be overlapping in time, promptly in this ascending time slot, the terminal of having only requirement to insert is just launched synchronous 1 signal, and this time slot of other terminal industry affair thereon code channel of communicating by letter is not launched.
14. the foundation of synchronous code division multiple access communication chain according to claim 1 and maintenance method is characterized in that also comprising preventing from the method for swinging to occur striving in inserting code channel, comprising:
1). the busy not busy B/I time slot of design in the frame structure of descending access code channel, in the base station all professional code channels all occupied or this insert code channel handling show when inserting busy, this time slot that receives descending access code channel when terminal shows when busy, have only superuser or special service number call to apply for inserting by force in the code channel of row access thereon by force, other terminal that is in wait state all can not be launched up access and be asked signal for instructions;
2). uplink and downlink insert the only access of processing terminal of code channel, and the transmission of process user authentication and caller in the professional code channel that is distributed, called phone number promptly inserted code channel and be in idle condition in most times;
3). user terminal is carried out packet transaction, and the base station all can only be carried out in the specific uplink and downlink frame of grouping the calling of user terminal and the access request of terminal;
4). occur striving and swing, when the affirmation signal that the up access request signal received and terminal can't obtain to insert can't be offered an explanation in the base station, terminal was sent the request of access once more with random delay after a period of time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97118934A CN1047047C (en) | 1997-10-05 | 1997-10-05 | Method for establishing and holding synchronous code division multiple access communication chain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97118934A CN1047047C (en) | 1997-10-05 | 1997-10-05 | Method for establishing and holding synchronous code division multiple access communication chain |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1182990A true CN1182990A (en) | 1998-05-27 |
| CN1047047C CN1047047C (en) | 1999-12-01 |
Family
ID=5175073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97118934A Expired - Lifetime CN1047047C (en) | 1997-10-05 | 1997-10-05 | Method for establishing and holding synchronous code division multiple access communication chain |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1047047C (en) |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003007520A1 (en) * | 2001-07-13 | 2003-01-23 | Linkair Communications, Inc. | A method and system for fast synchronization of uplink and a receiver for base station's access channel |
| CN1127818C (en) * | 1998-11-06 | 2003-11-12 | 西门子公司 | Synchronous method of user station in wireless communication system |
| WO2004066532A1 (en) * | 2003-01-23 | 2004-08-05 | Linkair Communications,Inc. | Implement method and apparatus for downlink synchronization subsystem |
| WO2004086780A1 (en) * | 2003-03-26 | 2004-10-07 | Huawei Technologies Co., Ltd. | Method for initial uplink synchronization in tdd system |
| CN1324824C (en) * | 2004-11-19 | 2007-07-04 | 中兴通讯股份有限公司 | Mapping method for terminal synchronous control command in multiple time slot communication system |
| WO2009043309A1 (en) * | 2007-09-29 | 2009-04-09 | Beijing Xinwei Telecom Technology Inc. | The method and apparatus of range measurement in wireless communication system |
| CN101090281B (en) * | 2007-06-19 | 2010-06-02 | 中兴通讯股份有限公司 | Uplink random access leading sequential selection method |
| CN1642058B (en) * | 2004-01-18 | 2010-09-29 | 方正通信技术有限公司 | Wireless link multiplexing method for time-division duplex CDMA mobile communication system |
| CN101090292B (en) * | 2006-06-12 | 2010-12-08 | 展讯通信（上海）有限公司 | Time synchronous method of digital centerless communication system |
| CN101198151B (en) * | 2006-12-04 | 2011-03-30 | 华为技术有限公司 | Random access method and mobile station |
| CN1897493B (en) * | 2000-10-03 | 2011-09-28 | 三菱电机株式会社 | Synchronisation method for base stations |
| US8300574B2 (en) | 2005-07-06 | 2012-10-30 | Zte Corporation | Method of uplink synchronization establishment based on the united transmission technology |
| US8311492B2 (en) | 2000-12-07 | 2012-11-13 | Interdigital Technology Corporation | Simple block space time transmit diversity using multiple spreading codes |
| CN103368607A (en) * | 2012-03-28 | 2013-10-23 | 株式会社巨晶片 | Communication system, communication device, and method for operating communication system |
| CN103368608A (en) * | 2012-03-28 | 2013-10-23 | 株式会社巨晶片 | Communication system, communication device and method for operating communication system |
| CN105745978A (en) * | 2014-10-29 | 2016-07-06 | 华为技术有限公司 | Time synchronization method, device and communication system |
| US9661583B2 (en) | 2000-02-23 | 2017-05-23 | Ipr Licensing, Inc. | Reverse link initial power setting using effective radiated power message to compute path loss |
| CN107493583A (en) * | 2017-06-29 | 2017-12-19 | 南京邮电大学 | A kind of price based on the online game of multi slope perceives the dispatching algorithm of user |
| CN108761434A (en) * | 2018-03-27 | 2018-11-06 | 中国电子科技集团公司第二十九研究所 | A kind of pseudo range measurement method and system based on CDMA downlink signals |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100450242C (en) * | 2006-04-30 | 2009-01-07 | 华为技术有限公司 | Uplink signal transmission method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5103459B1 (en) * | 1990-06-25 | 1999-07-06 | Qualcomm Inc | System and method for generating signal waveforms in a cdma cellular telephone system |
| KR960014406B1 (en) * | 1994-05-03 | 1996-10-15 | 한국이동통신 주식회사 | Synchronization method in cdma |
-
1997
- 1997-10-05 CN CN97118934A patent/CN1047047C/en not_active Expired - Lifetime
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1127818C (en) * | 1998-11-06 | 2003-11-12 | 西门子公司 | Synchronous method of user station in wireless communication system |
| US9661583B2 (en) | 2000-02-23 | 2017-05-23 | Ipr Licensing, Inc. | Reverse link initial power setting using effective radiated power message to compute path loss |
| CN1897493B (en) * | 2000-10-03 | 2011-09-28 | 三菱电机株式会社 | Synchronisation method for base stations |
| US8311492B2 (en) | 2000-12-07 | 2012-11-13 | Interdigital Technology Corporation | Simple block space time transmit diversity using multiple spreading codes |
| WO2003007520A1 (en) * | 2001-07-13 | 2003-01-23 | Linkair Communications, Inc. | A method and system for fast synchronization of uplink and a receiver for base station's access channel |
| WO2004066532A1 (en) * | 2003-01-23 | 2004-08-05 | Linkair Communications,Inc. | Implement method and apparatus for downlink synchronization subsystem |
| WO2004086780A1 (en) * | 2003-03-26 | 2004-10-07 | Huawei Technologies Co., Ltd. | Method for initial uplink synchronization in tdd system |
| CN1642058B (en) * | 2004-01-18 | 2010-09-29 | 方正通信技术有限公司 | Wireless link multiplexing method for time-division duplex CDMA mobile communication system |
| CN1324824C (en) * | 2004-11-19 | 2007-07-04 | 中兴通讯股份有限公司 | Mapping method for terminal synchronous control command in multiple time slot communication system |
| US8300574B2 (en) | 2005-07-06 | 2012-10-30 | Zte Corporation | Method of uplink synchronization establishment based on the united transmission technology |
| CN101090292B (en) * | 2006-06-12 | 2010-12-08 | 展讯通信（上海）有限公司 | Time synchronous method of digital centerless communication system |
| CN101198151B (en) * | 2006-12-04 | 2011-03-30 | 华为技术有限公司 | Random access method and mobile station |
| CN101090281B (en) * | 2007-06-19 | 2010-06-02 | 中兴通讯股份有限公司 | Uplink random access leading sequential selection method |
| US8320317B2 (en) | 2007-09-29 | 2012-11-27 | Beijing Xinweu Telecom Technology Inc. | Ranging method and apparatus in wireless communication system |
| CN101399607B (en) * | 2007-09-29 | 2013-01-02 | 北京信威通信技术股份有限公司 | Effective distance measuring method and device in wireless communication system |
| WO2009043309A1 (en) * | 2007-09-29 | 2009-04-09 | Beijing Xinwei Telecom Technology Inc. | The method and apparatus of range measurement in wireless communication system |
| CN103368608B (en) * | 2012-03-28 | 2016-08-31 | 株式会社巨晶片 | The method of operating of communication system, communicator and communication system |
| CN103368607B (en) * | 2012-03-28 | 2016-08-17 | 株式会社巨晶片 | The method of operating of communication system, communicator and communication system |
| CN103368608A (en) * | 2012-03-28 | 2013-10-23 | 株式会社巨晶片 | Communication system, communication device and method for operating communication system |
| CN103368607A (en) * | 2012-03-28 | 2013-10-23 | 株式会社巨晶片 | Communication system, communication device, and method for operating communication system |
| CN105745978A (en) * | 2014-10-29 | 2016-07-06 | 华为技术有限公司 | Time synchronization method, device and communication system |
| CN105745978B (en) * | 2014-10-29 | 2019-05-24 | 华为技术有限公司 | Method for synchronizing time, device and communication system |
| CN107493583A (en) * | 2017-06-29 | 2017-12-19 | 南京邮电大学 | A kind of price based on the online game of multi slope perceives the dispatching algorithm of user |
| CN107493583B (en) * | 2017-06-29 | 2020-09-25 | 南京邮电大学 | Price perception user scheduling algorithm based on multi-slope online game |
| CN108761434A (en) * | 2018-03-27 | 2018-11-06 | 中国电子科技集团公司第二十九研究所 | A kind of pseudo range measurement method and system based on CDMA downlink signals |
| CN108761434B (en) * | 2018-03-27 | 2022-06-28 | 中国电子科技集团公司第二十九研究所 | Pseudo-range measurement method and system based on CDMA downlink signals |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1047047C (en) | 1999-12-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1047047C (en) | Method for establishing and holding synchronous code division multiple access communication chain | |
| US6442153B1 (en) | Random access in a mobile telecommunications system | |
| AU720313B2 (en) | Random access in a mobile telecommunications system | |
| KR100653097B1 (en) | Random access in a mobile telecommunication system | |
| JP3792512B2 (en) | Random access in mobile telecommunications systems | |
| KR100944926B1 (en) | De-coupling forward and reverse link assignment for multi-carrier wireless communication systems | |
| US6169759B1 (en) | Common packet channel | |
| US6320855B1 (en) | Method and system for initiating idle handoff in a wireless communications system | |
| US6768727B1 (en) | Fast forward link power control for CDMA system | |
| JP2001522557A (en) | Random access in mobile communication systems | |
| CN1270722A (en) | Synchronous wireless access protocol method and apparatus | |
| US7408974B2 (en) | Composite code-division/time-division multiplex system | |
| US20030026324A1 (en) | Power-controlled random access | |
| EP1037491A1 (en) | A CDMA cellular communication system and method of access therefor | |
| AU4436000A (en) | Appararus and method for synchronizing channels in a W-CDMA communication system | |
| KR20060116019A (en) | Method and apparatus for overlaying multi-carrier and direct sequence spread spectrum signals in a broadband wireless communication system | |
| EP1723822A2 (en) | Access channel with constrained arrival times | |
| RU2214686C2 (en) | Arbitrary access in mobile communication system | |
| KR100453774B1 (en) | Common packet channel | |
| CN1223111C (en) | Method and base station for data transmission from and to user stations using common timeslot | |
| CA2535535C (en) | Random access in a mobile telecommunications system | |
| MXPA00003791A (en) | Random access in a mobile telecommunications system | |
| JP2001358646A (en) | Transmitter and base station unit comprising the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BEIJING XINWEI COMMUNICATION TECHNOLOGY CO., LTD. Free format text: FORMER NAME OR ADDRESS: XINWEI COMMUNICATION TECH. CO., LTD., BEIJING |
|
| CP03 | Change of name, title or address |
Address after: 100083 No. 40, Beijing, Xueyuan Road Patentee after: Xinwei Communications Technological Co., Ltd., Beijing Address before: 100083 No. 40, Beijing, Xueyuan Road Patentee before: Xinwei Communication Technology Co., Ltd., Beijing |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Effective date of registration: 20070319 Pledge (preservation): Pledge |
|
| DD01 | Delivery of document by public notice |
Addressee: Yang Yi Document name: Notification that Application Deemed not to be Proposed |
|
| DD01 | Delivery of document by public notice |
Addressee: Yang Yi Document name: Notification that Application Deemed not to be Proposed |
|
| DD01 | Delivery of document by public notice |
Addressee: Yang Yi Document name: Notice of amendment Addressee: Yang Yi Document name: Deemed not to advise |
|
| DD01 | Delivery of document by public notice | ||
| ASS | Succession or assignment of patent right |
Owner name: XINWEI COMMUNICATION TECH CO., LTD., CHONGQING Free format text: FORMER OWNER: XINWEI COMMUNICATIONS TECHNOLOGICAL CO., LTD., BEIJING Effective date: 20140221 |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 100083 CHAOYANG, BEIJING TO: 401121 YUBEI, CHONGQING |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20140221 Address after: 401121 No. 60, Xingguang Avenue, North New District, Chongqing Patentee after: Xinwei Communication Tech Co., Ltd., Chongqing Address before: 100083 No. 40, Beijing, Xueyuan Road Patentee before: Xinwei Communications Technological Co., Ltd., Beijing |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20140217 Granted publication date: 19991201 Pledgee: National Development Bank Pledgor: Xinwei Communications Technological Co., Ltd., Beijing Registration number: 200711343 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Method for establishing and holding synchronous code division multiple access communication chain Effective date of registration: 20140408 Granted publication date: 19991201 Pledgee: Datang Telecom Technology Industry Holding Co., Ltd.|Telecommunications Science and Technology Research Institute Pledgor: Xinwei Communication Tech Co., Ltd., Chongqing Registration number: 2014990000241 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20150402 Granted publication date: 19991201 Pledgee: Datang Telecom Technology Industry Holding Co., Ltd.|Telecommunications Science and Technology Research Institute Pledgor: Xinwei Communication Tech Co., Ltd., Chongqing Registration number: 2014990000241 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| CX01 | Expiry of patent term |
Granted publication date: 19991201 |
|
| CX01 | Expiry of patent term |