CN1452821A - Method and system for fast synchronization of uplink and receiver for base station's access channel - Google Patents
Method and system for fast synchronization of uplink and receiver for base station's access channel Download PDFInfo
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- CN1452821A CN1452821A CN01815249.XA CN01815249A CN1452821A CN 1452821 A CN1452821 A CN 1452821A CN 01815249 A CN01815249 A CN 01815249A CN 1452821 A CN1452821 A CN 1452821A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2662—Arrangements for Wireless System Synchronisation
- H04B7/2668—Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/004—Orthogonal
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Abstract
A method for fastly synchronizing uplink in the synchronization code division multiple access (SCDMA) communication system, wherein the method comprising the steps of: (1) a mobile station selects one idle access time slot from a plurality of access time slot into which a access channel including in uplink be divided, in accordance with a base station's transmitting information; (2) the mobile transmits access code at point of time in said idle access time slot; (3) the base station detects said access code, and determines a time delay adjustment information for said mobile station; (4) the base station transmits said time delay adjustment information to the mobile station; (5) the mobile station adjusts transmission time thereof in accordance with received said time delay adjustment information, thereby making subsequently transmitting information arrive at the base station at standard access time.
Description
Up-link fast synchronization method and system and
Base station's access channel connection technology field
The present invention relates to wireless communication system, more particularly to S-CDMA-Synchronous Code Division Multiple Access（CDMA) communication system, more system and relevant base station's access channel connect background technology
In recent years, radio communication turns into most active one side in the communications field, and CDMA systems with the unique advantage of Large Copacity, soft capacity, soft handover, high speech quality and low transmitting power and anti-interference and strong security etc. due to enabling it to show one's talent, develop rapidly, and the one preferred technique as third generation cellular system.
CDMA is a kind of modulation based on spread spectrum communication and multiadress connection technology.In cdma communication system, signal used in different user transmission information is distinguished with each different coded sequences, because CDMA systems using different patterns distinguish channel, thus these channels are all overlapped from the point of view of frequency domain and time domain, they take identical frequency range and time in other words, therefore the degree interfered that the performance of CDMA systems is heavily dependent between the characteristic quality of pattern, i.e., multiple channels will be a key factor for determining cdma system channel capacity and characteristic.
Referring to Fig. 1, it gives a kind of signal of cell mobile communication systems and is stranded, hexagonal inner is a cell, radio communication is that the Intra-cells carried out between the base station of Intra-cell and movement station have a base station and multiple movement stations, each movement station uses independent channel respectively, i.e. different spectrum-spreading address codes, and carry out radio communication with base station simultaneously.It is downlink (downl ink) typically to define from base station to movement station, and anti-^^ movement stations to base station are referred to as up-link (upl ink)
In CDMA systems, channel is mutually distinguished by by the different codes used, thus the correlation of this intersymbol be highly important that is, this interchannel independence and if only if distribute to each self-channel intersymbol it is uncorrelated each other and obtain what is ensured.When receiver recovers its coherent signal using Setting signal, these receivers should not be influenceed by the channel for employing other codings
However, in traditional CDMA systems, such as IS95 systems, its spreading code used is produced by the pseudo noise code sequence Walsh codes with minimum cross correlation value and maximum autocorrelation value.Due to IS95
System is asynchronous CDMA systems, its up channel, the signal that i.e. all movement stations are sent to base station is asynchronous communication, because the pseudo noise sequence from different movement stations can not be synchronous, the pseudo noise code sequence of different movement stations each other can not be orthogonal, therefore the spread-spectrum signal in same frequency range and same time can form great interference, i.e. multi-access inference each other, this interference not only greatly reduces channel capacity, and also add the complexity of Power Control.
In order to eliminate the multi-access inference of above-mentioned asynchronous communication system, it is desirable to use the spreading code with zero cross correlation value, i.e. orthogonal code（Not exclusively orthogonal and also zero correlation window！）And because the orthogonal property between orthogonal code sequence is set up on the premise of code sequence Complete Synchronization, therefore it is required that Complete Synchronization between these yard of sequence, therefore, in synchronization CDMA system, up, descending ^^ synchronization is very important.
In CDMA systems, the synchronization of downlink is easily realized, because many of difficulty are wanted in the synchronous realization that all signals are the but up-links sent out from single base station, each movement station is different from the distance of base station, send signal delay also different, and movement station does not know oneself size with the distance of base station, it is impossible to which adjustment sends signal time, then causing movement station to transmit a signal to up to base station asynchronous is vertical becomes more difficult.
In recent years, in the prior art for realizing that the uplink synchronisation problem of CDMA systems proposes some technical schemes, such as Chinese patent 97118934 discloses a kind of foundation for uplink synchronisation in synchronous CDMA system and holding scheme, but the more numerous Suo of the method, it is to solve uplink synchronous to set up process with complicated frame structure and control instruction, and can not quickly make multiple movement stations while setting up synchronization.
Therefore, it is badly in need of a kind of method that Fast synchronization is carried out to up-link in the prior art.The content of the invention
First purpose of the present invention is to provide a kind of method for carrying out up-link in synchronous code division multiple access communication system Fast synchronization, to solve the above mentioned problem and defect in the presence of prior art.
Second object of the present invention is to provide a kind of system for carrying out up-link in synchronous code division multiple access communication system Fast synchronization.
Third object of the present invention is to provide the receiver for base station's access channel used in a kind of synchronous code division multiple access communication system.
To realize above-mentioned one purpose of the mat woven of fine bamboo strips, the present invention provides a kind of right in synchronous code division multiple access communication system
The method that up ^ carries out Fast synchronization, it is characterised in that comprise the following steps：
(1) in the information that movement station is sent according to base station, the multiple access slots being divided into from the access channel for being contained in up-link, an idle access slot is selected；
(2) sometime transmission access code of the movement station in the idle access slot；
(3) detection ^ " in base station states access code, determines the time delay adjustment information of the movement station；
(4) base station sends the time delay adjustment information to movement station；
(5) movement station adjusts its transmission time according to the time delay adjustment information received, the signal that it then sends is reached base station in the turn-on time of standard
To realize above-mentioned second purpose, the present invention provides a kind of system for carrying out Fast synchronization to up-link in synchronous code division multiple access communication system, and the synchronous code division multiple access communication system includes at least one movement station and at least one base station,
The Fast synchronization system is characterised by：
At least one described movement station includes：
The device of miaow when one free time of selection is accessed in the multiple access slots being divided into for the information sent according to base station from the access channel for being contained in up-link；
For the device for sometime sending access code in the idle access slot；At least one described base station includes：
For detect the access code and determine movement station time delay adjustment information device；Device for sending from the time delay adjustment information to movement station；And
At least one described movement station also includes：
To realize above-mentioned 3rd purpose, the present invention provides a kind of receiver for base station's access channel used in synchronous code division multiple access communication system, it is characterised in that including：
Demodulator, for being demodulated to the access code signal that movement station is sent in the access channel for being contained in up-link；
Low pass filter, for carrying out LPF to the signal after demodulation；
Matched filter, for carrying out related operation to the signal by LPF and the access code sequence prestored；
Maximum value search circuit, for according to relevant parameter, determining the output signal of the matched filter
Threshold value；
Limiter, useful signal is exported for threshold value described in ^^；
Sliding correlation detector, for calculating the time that the access code reaches institute i stations experience from the movement station according to the useful signal；And
Calculations of offset module, is compared for the time to the experience and standard time, calculates time offset；And
Device for the time offset to be sent back to the movement station,
According to the method or system that carry out Fast synchronization to up-link in synchronous code division multiple access communication system of the present invention, the synchronous reception between the uplink signal of multiple movement stations can be quickly realized simultaneously, so as to reduce the interference between channel, the channel unit weight of increase system, and due to using unique access code and special matched filter structure, therefore the blunt height of synchronization accuracy ^, adjust number of times seldom, it more can ensure that the synchronous of up-link sets up quick effective, and method cylinder is single, it is easy to accomplish
According to the receiver for base station's access channel of the present invention, in each different access slot, pass through the arrival time of the signal energy computation mobile station signal of each movement station user, and it compares with the time of standard, then adjustment Delay is put into downlink to be sent to after the time delay adjustment information that movement station movement stations receive base station, its transmission time is adjusted, is allowed to reach the signal final standard compliant turn-on time of base station.Summary of drawings
By the way that with reference to detailed description of the accompanying drawing to best mode for carrying out the invention, above-mentioned and other feature and advantage of the invention will be more obvious.
Fig. 1 is a kind of structural representation of cell mobile communication systems；
Fig. 2 is the flow chart of the method for carrying out Fast synchronization to up-link in synchronous code division multiple access communication system according to the present invention；
Fig. 3 is the detail flowchart that time delay adjustment information was detected and determined in base station to access code；Fig. 4 is the uplink by movement station to base station applied in the present invention;^ enters the structural representation of channel；
Fig. 5 shows characteristic schematic diagram after access code is by matched filter for storing identical access code；
Fig. 6 shows that characteristic after access code is by matched filter for storing different access codes is illustrated
Figure；
Fig. 7 is the structural representation according to receiver for base station's access channel used in the system for carrying out Fast synchronization to up-link in synchronous code division multiple access communication system of the present invention.The optimal implementation of the present invention:^ formulas
The preferred forms of the present invention are described below in detail,
Fig. 2 is the flow chart of the method for carrying out Fast synchronization to up-link in synchronous code division multiple access communication system according to the present invention.
After movement station start, the information that movement station user is sent from down-link reception by base station first, carry out frequency correction and frame synchronization and bit synchronization with system, and obtain the information movement station Bu Sudden 201 of miaow during available access channel, according to the information of above-mentioned available Access Channel Slot, in the multiple access slots being divided into from the access channel for being contained in up-link, miaow during one idle access of selection.Then, in step 202, movement station sometime sends fixed access code in selected free timeslot.Concrete structure on accessing channel, reference picture 4 will be illustrated later.
Thereafter, in step 203, the access code that base station is sent to movement station is detected, determines the time delay regulation of breathing of movement station.
In step 204, base station sends above-mentioned time delay adjustment information to movement station.
In step 205, movement station adjusts its transmission time according to the time delay adjustment information received, the signal that it then sends is reached base station in the turn-on time of standard.
Access code is detected and the detail flowchart of time delay adjustment information is determined in Fig. 3 stations.Flow shown in Fig. 3 constitutes the step 203 in Fig. 2.
As shown in figure 3, in step 2031, the signal received is demodulated, LPF, matched filtering and related operation.In step 2032, using maximum value search circuit and relevant parameter, the threshold value of the signal is determined, in step 2033, by being compared with the threshold value, useful signal is exported by limiter.Bu Sudden 2034, the time that access code is undergone from movement station arrival base station is calculated using sliding correlation detector.In step 2035, the time and standard time of the experience are compared, time offset is calculated, is used as above-mentioned time delay adjustment information.
Fig. 4 is the structural representation that the uplink by movement station to base station applied in the present invention enters channel.As shown in figure 4, access channel is divided into M time slot, when movement station is attempted to access, each movement station is assigned to a time slot, is accessed, and it is this time slot subscriber signal is reached base station time
The position of an interior standard, to reach that each mobile station signal of up-link synchronously arrives at base station as movement station is ensured in normal place access, movement station will send the code word of N bit lengths in a time slot（Take NTC).Because a time slot for distributing to access channel is KTc
, so movement station sends the original position scope of code word between 0-(K-N) Tc.Sending the T beyond N bit wordscSignal is not sent
The access code that the other present invention is used is a kind of unique spreading code, and the access code is made up of three parts, and access code length is N, so it is set to sequence 1 by first N/3, N/3 are sequence 2 afterwards, and N/3 positions 0 are mended in centre, the characteristic between sequence 1 and sequence 2 with orthogonal complement.
To the user in a cell, fixed a group of access code can be used to be accessed, but different time slots can be selected.
It is a time slot in M time slot for distributing to access channel when movement station is accessed every time（KTC) in send fixed access code because user is when starting access, in this case it is not apparent that oneself signal reaches whether be the normal place of access behind base station, therefore sends the time（The transmission time that N bit words are the 1st）It is set to a fixed value S.
Secondly, receiver for base station's access channel is with each time slot（KTC) it is the deviation that unit calculates the signal that a movement station is sent.The access channel receiver of base station is in each different access slot, by the arrival time for the signal energy computation mobile station signal for receiving each movement station user, and it compares with the time of standard, calculate the gap of subscriber signal arrival time and standard on-position, then this time delay adjustment information is passed through to the time delay adjustment information that movement station sends the time by downlink transmission, the controller adjustment user of movement station user accesses the transmission time of code word next time, and the time of base station is reached for standard time until user accesses signal
Fig. 5 shows characteristic schematic diagram after access code is by matched filter for storing identical access code, it can be seen that submaximum value is both less than or equal to 0, and the very big of main peak value
Fig. 6 shows characteristic schematic diagram after access code is by matched filter for storing different access codes, it can be seen that its cross-correlation peak value very small for auto-correlation main peak value
By combining descriptions of the Fig. 2 and Fig. 3 to the method for the present invention, those skilled in the art in the art can readily devise, of the invention to possess following characteristics to the system that up-link carries out Fast synchronization in synchronous code division multiple access communication system.
At least one movement station included in synchronous code division multiple access communication system includes：
For the information that is sent according to base station from the access channel for being contained in up-link be divided into it is multiple
The device of an idle access slot is selected in access slot；
For the device for sometime sending access code in the idle access slot;
At least one base station included in synchronous code division multiple access communication system includes：
For detect access code and determine movement station time delay adjustment information device；
Device for sending out from the time delay adjustment information to movement station；And
At least one above-mentioned movement station also includes：The turn-on time of standard reaches the device of base station.
More specifically, the device of the above-mentioned time delay adjustment information for detecting the access code and determining movement station includes：
Demodulator, for being demodulated to the signal received；
Low pass filter, for carrying out LPF to the signal after demodulation；
Matched filter, for carrying out related operation to the signal by LPF and the access code sequence prestored；
Maximum value search circuit, for according to relevant parameter, determining the threshold value of the output signal of matched filter；
Limiter, according to threshold value, exports useful signal；
Sliding correlation detector, for calculating the time that access code reaches base station experience from movement station according to useful signal；And
Calculations of offset module, is compared for the time to above-mentioned experience and standard time, calculates time offset, the time offset is time delay adjustment information
The previously described all parts for being contained in base station, can be arranged in a receiver for base station's access channel.
Fig. 7 is to schematically show the structure that this access channel connects, and the access channel receiver is used to carry out Fast synchronization to the up-link of synchronous code division multiple access communication system
As shown in fig. 7, label 601 represents demodulator, 604 represent low pass filter, and 607 represent matched filter, and 608 represent limiter, and 609 represent maximum value search circuit, and 610 represent sliding correlation detector, and 611 represent time migration computing module.
Assuming that the real part that user sends code word is x (t), imaginary part is y (/), then the signal after modulating is：
C(i) = x( cos(iyc/) + _y(t)sin(6 )
If not considering the influence of noise, the signal that base station is received is：
C(t) = j (t)cos(<yct) + ^(/) sin(<yct)
I roads signal 602 is after the demodulated device 601 of access signal from movement station：
I(t) = C(t) x cos(iyc = [; (t)cos(iyct) + y{t) sin(iyct)] x cos(iyct)
= x(t)
x(t) c。s(2(yct) + y(t) sin(2iycT) pass through low pass filter 604, filter high-frequency signal, 605 signals are：/ ((0 is same, and Q roads signal 603 is after the demodulated device 601 of access signal from movement station by 0=^：
Q{t) = C{t) χ s { }ct) = [ (/)cos((¾Jc/) + y t) sin(iyct)] χ sin(<wct)
= x{t) sin(2ty
By low pass filter 604, high-frequency signal is filtered, 606 signals are：2 (0=^) send into the two paths of signals after low pass filter special matched filter 607, wave filter stores access code sequence, then the output offset of matched filter falls the autocorrelative all positive submaximum values of code word, and it is zero to make autocorrelative submaximum, or is negative.Big value search module 609 finds out the value of maximum from the output signal of matched filter 607, and the threshold value of limiter 608 below is used as using the product of its value and a parameter.After so by limiter 608, value in the energy value of all inputs more than threshold value is exported as former state, and filter the amount less than this threshold value, 0 is output as, the influence of auto-correlation submaximum, cross-correlation peak value, noise to calculating peak position is just efficiently reduced.
The output signal feeding next stage sliding correlation detector of limiter 608（Length is L) 610, it is intended that the position that the adjacent values of L of maximum are found from 2K value finds the position of last maximum from 2K value and (takes the position of last if having more than two equal maximums in 2K values）, i.e., user reach base station time.
The time of base station is reached with the subscriber signal calculated, is compared with normal place, offset is obtained in time migration computing module 611, delay control instruction DCC (Delay Control Command) orders are produced.
Postpone control instruction（Or time delay adjustment information）In downlink transmission to movement station, movement station user is received after the information of base station, adjusts its transmission time, is allowed to reach the signal final standard compliant turn-on time of base station.
When the value and the deviation of normal place exported from sliding correlation detector in allowed limits when, show to be successfully accessed.If successfully exporting " 1 " signal, while DCC exports a special command, user is told to be successfully accessed；If unsuccessful, " 0 " signal is exported, DCC is transfer order.
If calculating obtained movement station user access signal ceiling capacity the window's position exceeds adjustable extent, illustrate that adjustment loses Defeat in this case, base station wants downlink to be sent to the special DCC orders of user one, and user sends access pulse, accessed again again.
Above description can be clearly demonstrated, due to using access channel in up-link, and access channel is divided into different time slots, allow more movement stations access system simultaneously, ensure that the quick of up-link sets up additionally, due to the combination for employing access code and matched filter, the accuracy for calculating the time-delay deviation that movement station sends signal is ensure that, process is set up in the synchronization for accelerating up-link
Although describe in detail the preferred forms of the present invention above in association with accompanying drawing, for those skilled in the art in the art, various modifications may be made and change, without departing from the scope of the present invention and essence.Therefore, the scope of the present invention is limited only by the appended claims.
Claims (9)
- Claim1. a kind of method for carrying out Fast synchronization to up-link in synchronous code division multiple access communication system, it is characterised in that Bao include Yi Xia Bu Sudden：(1) information that movement station is sent according to base station, during the multiple accesses being divided into from the access channel for being contained in up-link in miaow, selects an idle access slot；(2) sometime transmission access code of the movement station in the idle access slot；(3) access code is detected in base station, determines the time delay adjustment information of the movement station；(4) base station sends the time delay adjustment information to movement station；(5) movement station adjusts its transmission time according to the time delay adjustment information received, the signal that it then sends is reached base station in the turn-on time of standard2. according to the method described in claim 1, it is characterised in that the step（3) it is included in the following step fried twisted dough sticks performed on base station：The signal received is demodulated, LPF, matched filtering and related operation, then output signal；Utilize maximum value search circuit and the related threshold value for determining the signal；By being compared with the threshold value, limiter output useful signal；Between；The time and standard time of the experience are compared, time offset is calculated, the time offset is the time delay adjustment information.3. method according to claim 2, it is characterised in that the step（2) in, the access code is that the fixed time in the idle access slot is sent.4. the method according to claim 2, it is characterised in that the step of described pair of signal received carries out matched filtering includes：The signal received and the access code sequence being stored in advance in matched filter are carried out to the step fried twisted dough sticks of related operation5. according to the method for any one of Claims 1-4, it is characterised in that：The access code is a kind of N spreading code, wherein first N/3 is sequence 1, latter N/3 is sequence 2, and middle N/3 is 0, the characteristic between sequence 1 and sequence 2 with orthogonal complement.6. a kind of system for carrying out Fast synchronization to up-link in synchronous code division multiple access communication system, institute Stating synchronous code division multiple access communication system includes at least one movement station and at least one base station,The Fast synchronization system is characterised by：At least one described movement station includes：The device of miaow when one free time of selection is accessed in the multiple access slots being divided into for the information sent according to base station from the access channel for being contained in up-link；For the device for sometime sending access code in the idle access in miaow；At least one described base station includes：Device for detecting the time delay adjustment information be confused access code and determine movement station；Device for sending from the time delay adjustment information to movement station；AndAt least one described movement station also includes：The turn-on time of standard reaches the device of base station.7. the system described in claim 6, its special ^ includes in the device of the time delay adjustment information for detecting the access code and determining movement station：Demodulator, for being demodulated to the signal received；Low pass filter, for carrying out LPF to the signal after demodulation；Matched filter, for carrying out related operation to the signal by LPF and the access code sequence prestored；Maximum value search circuit, for according to relevant parameter, determining the threshold value of the output signal of the matched filter；Limiter, according to the threshold value, exports useful signal；Sliding correlation detector, for calculating the time that the access code reaches the base station experience from the movement station according to the useful signal；AndCalculations of offset module, is compared for the time to the experience and standard time, calculates time offset, the time offset is the time delay adjustment information8. the system according to claim 7, it is characterised in that the device for sometime sending access code being used in the idle access in miaow sends access code in fixed time,9. the system of any one of M claims 6 to 8, it is characterised in that：The access code is a kind of N spreading code, wherein first N/3 is sequence 1, latter N/3 is sequence 2, and middle N/3 is 0, the characteristic between sequence 1 and sequence 2 with orthogonal complement10. a kind of receiver for base station's access channel used in synchronous code division multiple access communication system, it is characterised in that including：Demodulator, for being demodulated to the access code signal that movement station is sent in the access channel for being contained in up-link；Low pass filter, for carrying out LPF to the signal after demodulation；Matched filter, for carrying out related operation to the signal by LPF and the access code sequence prestored；Maximum value search circuit, for according to relevant parameter, determining the threshold value of the output signal of the matched filter；Limiter, for exporting useful signal according to the threshold value；Sliding correlation detector, for calculating the time that the access code reaches the base station experience from the movement station according to the useful signal；AndCalculations of offset module, is compared for the time to the experience and standard time, calculates time offset；AndDevice for the time offset to be sent back to the movement station.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2001/001173 WO2003007520A1 (en) | 2001-07-13 | 2001-07-13 | A method and system for fast synchronization of uplink and a receiver for base station's access channel |
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| Publication Number | Publication Date |
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| CN1452821A true CN1452821A (en) | 2003-10-29 |
| CN1211966C CN1211966C (en) | 2005-07-20 |
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| CN01815249.XA Expired - Fee Related CN1211966C (en) | 2001-07-13 | 2001-07-13 | Method and system for fast synchronization of uplink and receiver for base station's access channel |
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| WO (1) | WO2003007520A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101185270B (en) * | 2005-11-16 | 2010-10-13 | 中兴通讯股份有限公司 | Uplink synchronization method in mobile communication system |
| WO2010148532A1 (en) * | 2009-06-22 | 2010-12-29 | 上海贝尔股份有限公司 | Method and device for establishing uplink synchronization |
| CN105409271A (en) * | 2013-12-04 | 2016-03-16 | 华为技术有限公司 | Management frame sending processing method and system |
| CN109428614A (en) * | 2017-08-30 | 2019-03-05 | 华为技术有限公司 | A kind of dynamic time method of adjustment, device and system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101133582B (en) * | 2005-07-06 | 2011-02-02 | 中兴通讯股份有限公司 | Ascending synchronization establishing method based on associated transmission technology and transmission matrix thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047047C (en) * | 1997-10-05 | 1999-12-01 | 北京信威通信技术有限公司 | Method for establishing and holding synchronous code division multiple access communication chain |
| AR018668A1 (en) * | 1998-06-13 | 2001-11-28 | Samsung Electronics Co Ltd | METHOD FOR CONTROLLING CHANNEL ACCESS THROUGH RESERVATION OF ACCESS SLOTS IN A MOBILE COMMUNICATION SYSTEM |
| CN1139275C (en) * | 1998-07-14 | 2004-02-18 | 三星电子株式会社 | Method of initializing packet traffic channel in communication system |
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2001
- 2001-07-13 WO PCT/CN2001/001173 patent/WO2003007520A1/en active Application Filing
- 2001-07-13 CN CN01815249.XA patent/CN1211966C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101185270B (en) * | 2005-11-16 | 2010-10-13 | 中兴通讯股份有限公司 | Uplink synchronization method in mobile communication system |
| WO2010148532A1 (en) * | 2009-06-22 | 2010-12-29 | 上海贝尔股份有限公司 | Method and device for establishing uplink synchronization |
| EP2448340A1 (en) * | 2009-06-22 | 2012-05-02 | Alcatel Lucent | Method and device for establishing uplink synchronization |
| US8682369B2 (en) | 2009-06-22 | 2014-03-25 | Alcatel Lucent | Method and device for implementing uplink synchronization |
| EP2448340A4 (en) * | 2009-06-22 | 2015-02-11 | Alcatel Lucent | Method and device for establishing uplink synchronization |
| CN105409271A (en) * | 2013-12-04 | 2016-03-16 | 华为技术有限公司 | Management frame sending processing method and system |
| CN105409271B (en) * | 2013-12-04 | 2019-07-09 | 华为技术有限公司 | The transmission processing method and system of management frame |
| CN109428614A (en) * | 2017-08-30 | 2019-03-05 | 华为技术有限公司 | A kind of dynamic time method of adjustment, device and system |
| US11025362B2 (en) | 2017-08-30 | 2021-06-01 | Huawei Technologies Co., Ltd. | Dynamic time adjustment method, apparatus, and system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003007520A1 (en) | 2003-01-23 |
| CN1211966C (en) | 2005-07-20 |
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