CN101185270A - Uplink synchronization method in mobile communication system - Google Patents
Uplink synchronization method in mobile communication system Download PDFInfo
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- CN101185270A CN101185270A CNA2005800499324A CN200580049932A CN101185270A CN 101185270 A CN101185270 A CN 101185270A CN A2005800499324 A CNA2005800499324 A CN A2005800499324A CN 200580049932 A CN200580049932 A CN 200580049932A CN 101185270 A CN101185270 A CN 101185270A
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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
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The present invention provides an up-link synchronization method in mobile communication system, comprises the following steps: (1) performing initial synchronization between a base station and a user equipment, and initial synchronization adjusting amount information used by the user equipment is included in initial synchronization adjusted signal sent by the user equipment; (2) the base station compares the received timing of user signal and the timing required by the base station, if the timing difference is more than a preset threshold, then performing initial synchronization with the user equipment again, until the timing difference is less than the preset threshold; (3) performing synchronous tracking between the base station and the user equipment, the user equipment sends the signal keeping time sequence , or, passing the signal adjusted synchronistically and comprising the synchronization adjusting amount information used by the user equipment, and turning back to step (2). The present invention improves precision and stability of up-link synchronization, and improves capacity and performance of the system.
Description
Uplink synchronisation method in GSM
Technical field
The present invention relates to GSM, the more particularly to uplink synchronisation method in GSM.Background technology
Either in analog communication system, still in digital communication systems, synchronous foundation and holding is all the basis of communicating pair interaction.In mobile communication system, the foundation and holding of downlink synchronization are general is completed by user equipment searches and tracking descending synchronous signal channel and broadcast channel, and the foundation of uplink synchronisation and holding then pass through base station equipment and search for access signal（Such as prefix and uplink synchronous channel）Completed with the timing adjustment of upward signal, for the ease of the realization of this process, someone's WCDMA also especially set out（WCDMA) in GSM RACH structure.But under this performance, the synchronization of up-link both faces towards single-user equipment, user equipment now does not adjust the transmitting timing of itself dynamically.
On the other hand, due to lacking the urgency realized and applying upper complexity, do not studied and inquired into well in the synchronous requirement of base station end holding for the upward signal of all user equipmenies, until CDMA (CDMAs）The extensive use of technology.Cdma system is self-interference system, and upward signal keeps the synchronous capacity and performance for being conducive to improving whole system in base station side, and its synchronous required precision is more much higher than gsm system.Based on this consideration, there has been proposed a kind of synchronous method of backward channel.In this method, when positive synchronizing signal being sent into all movement stations associated therewith in base station, reverse sync signal is respectively sent to base station by movement station in the way of the positive synchronizing signal with being received is synchronised.Once receiving reverse sync signal, base station then calculates the delay for these movement stations and will be sent to respective movement station about synchronous information.Based on the information, movement station controls to be sent to the synchronization of the channel signal of the base station respectively.Uplink synchronous transmission plan, the time division CDMA of this method in a wcdma mobile communication system（TD-CDMA) GSM and TD SDMA（TD-SCDMA) in the uplink synchronous technology in GSM, require that upward signal keeps synchronous in base station side.As shown in figure 1, being the implementation environment schematic diagram for the uplink synchronous technology that the present invention is absorbed in.
In general, uplink synchronous technology includes initial synchronisation and synchronized tracking two parts, as shown in Fig. 2
For the implementation process schematic diagram of existing uplink synchronous technology, mainly include following several steps：Step 21, base station sends downlink synchronous signal, so that user equipment obtains down-going synchronous；Step 22, user equipment sends up initial sync signal according to the situation of down-going synchronous；Step 23, base station is obtained and sends the initial synchronisation adjustment amount of user equipment, and timing is sent so that user equipment adjustment is up；Step 24, user equipment adjusts the signal after concurrent warp let-off initial synchronisation adjustment according to the initial synchronisation adjustment amount received, and the step for passing through, the process of initial synchronisation is also just completed；Step 25, base station assesses whether user equipment needs to synchronize adjustment, since the step for, uplink synchronous enters the synchronized tracking stage, up timing is adjusted then into step 26 if necessary to user's equipment, otherwise into step 28;Step 26, user equipment synchronizing signal adjustment amount is issued in base station；Step 27, user equipment adjusts the signal of concurrent warp let-off synchronous adjustment according to synchronizing signal adjustment amount, and flow is transferred to step 25;Step 28, base station requires that user equipment keeps signal transmission timing, and this process can be realized by the way that adjustment amount to be set to the value of prior mutual concession；Step 29, user equipment sends the signal for keeping sequential, and flow is transferred to step 25.
By this flow it is seen that, when needing to utilize the actual timing adjustment amount of user equipment in base station side, it is the adjustment amount required by base station that can only also give tacit consent to the latter.It will so cause at least face both sides problem：One the reason for be due to communication quality so that base station is different with the adjustment amount that user equipment is understood；Two the reason for be due to user equipment so that adjustment amount can not reach the requirement of base station.And the actual timing adjustment amount of user equipment is undoubtedly base station and further assesses whether user equipment needs to synchronize the basis of adjustment.However, in this important step, the various methods of present do not improve this process so that the implementation performance of uplink synchronous is not improved.The content of the invention
The technical problems to be solved by the invention are the provision of the method for uplink synchronous in mobile communication system, to allow uplink synchronous and up quasi synchronous GSM to obtain more preferably uplink synchronous effect, the capacity and performance of GSM are lifted.
The technical scheme provided to solve the technical problem present invention comprises the following steps-
(1) initial synchronisation, and the initial synchronisation adjustment amount information applied in the signal after initial synchronisation is adjusted that user equipment is sent comprising user equipment are carried out between base station and user equipment；
(2) base station makes comparisons the timing of the subscriber signal received with the timing required by base station side, if timing difference is more than pre-determined threshold, initial synchronisation is carried out again with user equipment, until timing difference is small
In pre-determined threshold；
(3) synchronize tracking between base station and user equipment, user equipment sends the signal for keeping sequential, or after synchronous adjustment, the signal of synchronous adjustment amount information that includes user equipment and applied, and return to step（2) re-execute.
Wherein step（1) include：
(a) base station sends downlink synchronous signal；
(b) user equipment sends up initial sync signal according to the situation of down-going synchronous；
(c) base station obtains and sends the initial synchronisation adjustment amount of user equipment；
(d) user equipment adjusts the initial synchronisation adjustment amount information applied in the signal after concurrent warp let-off initial synchronisation adjustment, the signal containing user equipment according to the initial synchronisation adjustment amount received.
Step（2) include：
(el) position in the corresponding signal footpath of desired value of the subscriber signal timing received in base station end is determined；
(e2) the synchronous adjustment amount that user equipment is applied is obtained from subscriber signal, and the synchronous adjustment amount of user equipment is sent to according to base station, the actual synchronization adjustment amount of user equipment is determined； .
(e3) according to the actual synchronization adjustment amount, the energy that the channel impulse response of the collection of letters number is docked using wave filter is filtered, and obtains sequence (")；
(e4) using the energy of most powerful path in noise energy and sequence to sequence1Post-processed to distinguish noise path and effective diameter, and the result sequence that the value on non-noise path position is assigned to5Value on ^, ") remaining position is set to 0;
(e5) in sequence) in the search determination the corresponding signal footpath of desired value position；(e6) comparing result for the energy estimated according to actual RAKE energy on the footpath and by channel estimation results, confirms to the footpath searched, if it is confirmed that the footpath is the false footpaths of Virtual, then by false path position1^ (") value is set to 0, and return to step（E5), otherwise it is transferred to step（e7) ；
(e7) timing in the footpath is contrasted with the timing required by base station end, if timing difference is more than pre-determined threshold, base station requires that user equipment carries out initial synchronisation again, until timing difference is less than pre-determined threshold.
Step (3) includes：
(g) base station assesses whether user equipment needs to synchronize adjustment, if it is desired, then perform step（H), otherwise, into step（j ) ；
(h) user equipment synchronizing signal adjustment amount is issued in base station；
(i) user equipment adjusts the synchronous adjustment amount information applied in the signal of concurrent warp let-off synchronous adjustment, the signals containing user equipment, return to step according to synchronizing signal adjustment amount（2) re-execute；
(j) base station requires that user equipment keeps signal transmission timing；
(k) user equipment sends the signal for keeping sequential, return to step（2) re-execute.
The present invention uses the timing adjustment amount that the method for increasing feedback mechanism in uplink synchronous flow allows base station end accurately to learn user equipment, so as to eliminate the deviation of estimation, filtered simultaneously by shifting, wave technology and footpath verification technique reduce the probability that the false footpaths of Virtual are introduced because of reasons such as noises, the precision and stability of uplink synchronous is set to be greatly improved, and then the capacity and performance of lifting system.Summary of drawings
Fig. 1 is the cell schematic diagram of GSM；
Fig. 2 is existing uplink synchronous implementing procedure figure；
Fig. 3 is uplink synchronous schematic flow sheet described according to embodiments of the present invention；
Fig. 4 is that base station described according to embodiments of the present invention assesses whether user equipment needs to carry out the schematic flow sheet of initial synchronisation again.Preferred forms of the invention
In order to improve uplink synchronous performance, it is dynamic adjustment to send timing in view of user, so present invention uses the timing adjustment amount that the method for increasing feedback mechanism in uplink synchronous flow allows base station end accurately to learn user equipment, to eliminate the deviation of estimation, while proposing the technology of displacement filtering and the method for footpath checking introduces the probability in false footpath because of reasons such as noises to reduce.
Uplink synchronisation method proposed by the invention can apply to TD-CDMA, TD-SCDMA and
In the GSMs such as WCDMA.Illustrate implementation of the present invention in TD-SCDMA below in conjunction with accompanying drawing, so as to illustrate the technical characteristic and function characteristicses of the present invention.
As shown in figure 3, implementation steps of the present invention in TD-SCDMA are：
Step 30, base station passes through descending synchronous signal channel（DwPCH downlink synchronous signal) is sent, so that user equipment obtains down-going synchronous.
Step 31, user equipment passes through uplink synchronous channel according to the situation of down-going synchronous（UpPCH. up initial sync signal) is sent；
Step 32, base station obtains and passes through physical access channel（FPACH the initial synchronisation adjustment amount of user equipment) is sent, timing is sent so that user equipment adjustment is up.
Step 33, user equipment adjusts the signal after concurrent warp let-off Chu Shi Tong Walk adjustment according to the initial synchronisation adjustment amount received, and as the case may be, the signal will pass through Physical Random Access Channel（) or DPCH PRACH（The transmission such as DPCH), in addition, the initial synchronisation adjustment amount information applied containing user equipment can be carried in the signal.
Step 34, assess whether user equipment needs to carry out initial synchronisation again in base station, when assessing the transmission timing of user equipment, base station need to consider the actual timing adjustment amount of the last timing adjustment amount for requiring user equipment and user equipment feedback, if the timing adjustment amount that base station needs user equipment to carry out is more than certain thresholding, flow enters step 35, otherwise into step 36.
Step 35, initial synchronisation of the base station by the progress of signaling request user equipment again, the signaling can be carried on DPCH or Secondary Common Control Physical Channel（) etc. S-CCPCH on.
Step 36, base station assesses whether user equipment needs to synchronize adjustment, if step 34 needs half of the synchronization timing adjustment more than synchronization timing adjusting step that user equipment is carried out, flow enters step 37, and otherwise flow enters step 39.
Step 37, base station passes through the simultaneous bias on the channels such as descending DPCH（SS) field issues the order of user equipment synchronizing signal adjustment, this process can be realized by the way that SS fields to be set to the value of prior mutual concession, a step-length is adjusted forward using 00 expression synchronization timing such as in QPSK modulation, and uses 11 to represent that synchronization timing adjusts a step-length backward.
Step 38, the signal for the concurrent warp let-off synchronous adjustment of order adjustment that user equipment is adjusted according to synchronizing signal, the actual synchronization adjustment amount that the signal is applied by the SS field signals base station itself on the channels such as up DPCH, flow is transferred to step 34.
Step 39, base station requires that user equipment keeps signal transmission timing, and this process can be by by SS
Field is set to the value of prior mutual concession and realized, 01 is used such as when QPSK is modulated, and 011 is then used in 8PSK.
Step 40, user device transmissions keep sending the signal of timing, and in the corresponding value of SS fields filling, flow is transferred to step 34.
For base station assess user equipment whether need to carry out initial synchronisation again the step for when, the present invention so propose using displacement filtering and footpath verification technique, to improve the mode of uplink synchronous performance, its specific implementation step can be as shown in Figure 4：
Step 341, it is determined that the desired value of the subscriber signal timing received in base station end, such as can be set to expect to receive the first footpath of signal（Initial path) position, at this point for all user equipmenies, the desired value is equal.
Step 342, the synchronous adjustment amount that user equipment is applied is obtained from subscriber signal, the synchronous adjustment amount of user equipment is sent to reference to base station, so as to obtain the substantial synchronization adjustment situation of user equipment.Base station side can be used during specific implementation5 = 51 +(1-3) * obtains the adjustment amount finally approved, wherein requiring the timing adjustment amount of user equipment for the base station last time, ＆ is the actual timing adjustment amount that user equipment feeds back,3For filter coefficient, can interval be [0,1], actual value can be determined according to the signal to noise ratio of communication link.
Step 343, the energy that the channel impulse response of the collection of letters number is docked using wave filter is filtered, and obtains sequence (sequence 1 i.e. in accompanying drawing 4), need to consider that the substantial synchronization of user equipment adjusts situation in filtering.It is assumed that the output sequence of last wave filter is：
Z,(«-l) Z2("-l) Z30_1) ..., Z -1) ..., Z, n-) wherein I be filter output sequence length, typically take the value more than or equal to channel estimation window length；N is the sequence number that n-th is filtered, for the 1st filtering, and the output of wave filter can be directly disposed as the value related to channel impulse response even channel impulse response in itself.
If the energy sequence for defining the channel impulse response of input is ("), have in the case of using Alpha's Alpha wave filters：
Z,.(«) = * ("—l) + (l— i = l,2,-;I wherein ^ be Alpha wave filters coefficient, can interval be [0,1], filtering initial several frames can also using become Alpha filter coefficients method, to improve convergence.
Assume next that substantial synchronization adjustment amount reflection that step 342 draws to the output sequence of wave filter be reach, then defined nucleotide sequence be-^ "-wherein 1≤≤/- work as/>/-when, then by one1) it is set to the power of interference signal；In the case where moving k after the substantial synchronization adjustment amount reflection that step 342 is drawn is to filter output sequence, then definition-sequence is=wherein l≤≤ J, and at that time, then will1^"— 1) it is set to the power of interference signal；It is assumed that the substantial synchronization adjustment amount that step 342 is drawn is 0, i.e., do not adjust, then defined nucleotide sequence; r(" - 1) = Z(" - 1).Step 344, the energy of most powerful path, will be compared with interference signal, to distinguish noise path and effective diameter to being post-processed to distinguish noise path and effective diameter in the sequence obtained using noise energy and above;Then the value on non-noise path position is assigned to another sequence (sequence 2 i.e. in accompanying drawing 4), therefore really one result sequence, without special character, is only intended to carry the result needed in ^.Its size with it is identical.Value on remaining position is set to 0.Thresholding can be set during practical operation by noise energy and most powerful path energy, and think that the position for being less than this thresholding in sequence is the position of noise path.
Step 345, the order according to numbering from small to large searches for the position i in first footpath in the sequence, so that step 346 is confirmed.
Step 346, first footpath is confirmed using actual RAKE energy on the footpath and the comparing result of estimated energy.Using the first path position acquired in step 345, Check finds out the transient channel estimate on the footpath, and the energy of RAKE on the footpath can be calculated by information such as transient channel estimate and spreading factorsp, at the same time, actual energy (" can also be drawn by directly carrying out RAKE processing on the footpath), if w<O) (wherein κ is parameter, can interval be (0,1)), it is false footpath then to think the footpath, and in the sequence set to 0 the value of i positions (being step 348 in figure), and step 345 is transferred to, the first footpath that the footpath is subscriber signal is otherwise confirmed, into step 347.
Step 347, the timing in first footpath is contrasted with the timing required by base station end, if the timing adjustment amount that base station needs user equipment to carry out is more than thresholding T, flow enters step 35 in Fig. 3, and base station carries out initial synchronisation again by signaling request user equipment；Otherwise step 36 in Fig. 3 is entered, base station assesses whether user equipment needs to synchronize adjustment；Wherein thresholding Τ interval is (- 16,16) chip.
Claims (1)
- Claims1st, the method for realizing uplink synchronization in a kind of GSM, it is characterised in that comprise the following steps：(1) initial synchronisation, and the initial synchronisation adjustment amount information applied in the signal after initial synchronisation is adjusted that user equipment is sent comprising user equipment are carried out between base station and user equipment；(2) base station makes comparisons the timing of the subscriber signal received with the timing required by base station side, if timing difference is more than pre-determined threshold, initial synchronisation is carried out again with user equipment, until the small of timing difference is in pre-determined threshold；(3) synchronize tracking between base station and user equipment, user equipment sends the signal for keeping sequential, or after synchronous adjustment, the signal of synchronous adjustment amount information that includes user equipment and applied, and return to step（2) re-execute.2nd, the method as described in claim 1, it is characterised in that the step（1) include： .(a) base station sends downlink synchronous signal；(b) user equipment sends up initial sync signal according to the situation of down-going synchronous；(c) base station obtains and sends the initial synchronisation adjustment amount of user equipment；(d) user equipment adjusts the initial synchronisation adjustment amount information applied in the signal after concurrent warp let-off initial synchronisation adjustment, the signal containing user equipment according to the initial synchronisation adjustment amount received.3rd, the method as described in claim 1, it is characterised in that the step（2) include：(el) position in the corresponding signal footpath of desired value of the subscriber signal timing received in base station end is determined；(e2) the synchronous adjustment amount that user equipment is applied is obtained from subscriber signal, and the synchronous adjustment amount of user equipment is sent to according to base station, the actual synchronization adjustment amount of user equipment is determined；(e3) according to the actual synchronization adjustment amount, the energy that the channel impulse response of the collection of letters number is docked using wave filter is filtered, and obtains sequence；(e4) sequence is post-processed using the energy of most powerful path in noise energy and sequence to distinguish noise path and effective diameter, and by (") the result sequence that is assigned to of the value on non-noise path position, Value on remaining position is put0; (e5) position in the corresponding signal footpath of desired value of the determination is searched in ") in sequence；(e6) comparing result for the energy estimated according to actual RAKE energy on the footpath and by channel estimation results, confirms to the footpath searched, if it is confirmed that the footpath is false footpath, then by the ^ (" on false path position) value puts0, and return to step（e5), otherwise it is transferred to step（e7) ；(e7) timing in the footpath is contrasted with the timing required by base station end, if timing difference is more than pre-determined threshold, base station requires that user equipment carries out initial synchronisation again, until timing difference is less than pre-determined threshold.4th, the method as described in claim 1, it is characterised in that the step（3) include：(g) base station assesses whether user equipment needs to synchronize adjustment, if it is desired, then perform step（H), otherwise, into step（j ) ；(h) user equipment synchronizing signal adjustment amount is issued in base stations；(i) user equipment adjusts the synchronous adjustment amount information applied in the signal of concurrent warp let-off synchronous adjustment, the signal containing user equipment, return to step according to synchronizing signal adjustment amount（2) re-execute；(j) base station requires that user equipment keeps signal transmission timing；(k) user equipment sends the signal for keeping sequential, return to step（2) re-execute.5th, method as claimed in claim 3, it is characterised in that the step（El), including：The desired value of subscriber signal timing is set to expect to receive to the position in the first footpath of signal.6th, method as claimed in claim 3, it is characterised in that the step（E2), including：Actual adjustment amount is determined using=3*+(1- δ) *, wherein, it is the timing adjustment amount for requiring user equipment the base station last time, is the actual timing adjustment amount of user equipment feedback, is filter coefficient.7th, method as claimed in claim 6, it is characterised in that described 3 interval is [0,1], actual value can be determined according to the signal to noise ratio of communication link.8th, method as claimed in claim 3, it is characterised in that the step（), e3 including-set the output sequence of last wave filter as：Zi("— Z^n~l) , Z^n~l...,Ζ' ("-...,Ζ- ^), I is the length of filter output sequence in certain, and η is the sequence number of the η times filtering；If step（E2 the actual synchronization adjustment amount reflection) determined is reach to the output sequence of ^ devices is filtered K, shellfish U are defined, and "-sequence is one1) = z^ (" — Shang）, wherein i<≤/- fe, and when-, then general-D is set to the power of interference signal；If step（E2) determine actual synchronization adjustment amount reflection to wave filter output sequence be after move k, then defined nucleotide sequence for ^ "-1) ^'-^— 1), wherein 1≤≤/, and at that time, then it incite somebody to action-is set to the power of interference；If step（E2) the actual synchronization adjustment amount determined is 0¾Then defined nucleotide sequence1 D = zThe energy sequence of the channel impulse response of ("-set input is then has in the case of using Alpha wave filters：Zi{n) = * Yi(n-l) + =1,2 ,-,/coefficient wherein for Alpha wave filters.9th, method as claimed in claim 3, it is characterised in that the step（E4), including-thresholding is set by noise energy and most powerful path energy, be by the location confirmation in sequence less than this thresholding be noise path position.10th, method as claimed in claim 3, it is characterised in that the step（E5), including：The position in the corresponding signal footpath of desired value of the determination is searched in sequences y according to the order of numbering from small to large.11st, method as claimed in claim 3, it is characterised in that the step（E6), including：According to step（E5 the signal path position) found, finds out the transient channel estimate on the footpath；According to the transient channel estimate, the energy of RAKE on the footpath is calculated；By directly carrying out RAKE processing on the footpath, actual energy O is obtained);If (")<*), wherein κ is parameter, then it is assumed that the footpath is false footpath, and in the sequence sets to 0 the value of i positions, and is transferred to step（E5), otherwise it is transferred to step（e7) .12nd, method as claimed in claim 11, it is characterised in that the interval of the K is (0,1).13rd, the method as described in claim 1, it is characterised in that step（2) pre-determined threshold is (- 16,16) chip.Fig. 22/4
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2005/001934 WO2007056891A1 (en) | 2005-11-16 | 2005-11-16 | A up-link synchronization method in mobile communication system |
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| CN101185270A true CN101185270A (en) | 2008-05-21 |
| CN101185270B CN101185270B (en) | 2010-10-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8908602B2 (en) | 2011-03-02 | 2014-12-09 | Hitachi, Ltd. | Clustering method of mobile communication and remote radio head thereof |
| US10484956B2 (en) | 2014-09-30 | 2019-11-19 | Huawei Technologies Co., Ltd. | Transmission timing adjustment method and device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106304313A (en) * | 2015-05-21 | 2017-01-04 | 中兴通讯股份有限公司 | The processing method and processing device of timing slip |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1154269C (en) * | 1999-09-28 | 2004-06-16 | 西门子（中国）有限公司 | Method and system for keeping upper links in synchronization in CDMA mobile communication system |
| 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 |
| CN1277423C (en) * | 2003-03-20 | 2006-09-27 | 华为技术有限公司 | Up synchronous method after realizing hard switch in time division duplex system |
| US6954447B2 (en) * | 2003-11-07 | 2005-10-11 | Interdigital Technology Corporation | Method and apparatus for uplink synchronization in wireless communications |
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2005
- 2005-11-16 CN CN2005800499324A patent/CN101185270B/en not_active Expired - Fee Related
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8908602B2 (en) | 2011-03-02 | 2014-12-09 | Hitachi, Ltd. | Clustering method of mobile communication and remote radio head thereof |
| US10484956B2 (en) | 2014-09-30 | 2019-11-19 | Huawei Technologies Co., Ltd. | Transmission timing adjustment method and device |
| US10856247B2 (en) | 2014-09-30 | 2020-12-01 | Huawei Technologies Co., Ltd. | Transmission timing adjustment method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007056891A1 (en) | 2007-05-24 |
| CN101185270B (en) | 2010-10-13 |
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