CN101185270B - Uplink synchronization method in mobile communication system - Google Patents

Uplink synchronization method in mobile communication system Download PDF

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CN101185270B
CN101185270B CN2005800499324A CN200580049932A CN101185270B CN 101185270 B CN101185270 B CN 101185270B CN 2005800499324 A CN2005800499324 A CN 2005800499324A CN 200580049932 A CN200580049932 A CN 200580049932A CN 101185270 B CN101185270 B CN 101185270B
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signal
subscriber equipment
base station
adjustment amount
sequence
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CN101185270A (en
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丁美玲
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ZTE Corp
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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
    • 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)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

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 the mobile communication system
Technical field
The present invention relates to mobile communication system, particularly the uplink synchronisation method in the mobile communication system.
Background technology
No matter be in analog communication system, still in digital communication system, synchronous foundation and maintenance all are the mutual bases of communicating pair.In mobile communication system, the foundation of downlink synchronization and maintenance are generally finished by user equipment searches and tracking descending synchronous signal channel and broadcast channel, the foundation of uplink synchronisation and maintenance are then finished by the timing adjustment of base station equipment search access signal (as prefix and uplink synchronous channel) and upward signal, for the ease of the realization of this process, there is the people also to propose the structure of Random Access Channel in Wideband Code Division Multiple Access (WCDMA) (WCDMA) mobile communication system especially.But under this performance, up link synchronously all towards single-user equipment, the emission that the subscriber equipment of this moment is not dynamically adjusted self is regularly.
On the other hand, because lack to realize urgent and the complexity used, keep synchronous requirement not obtain excellent research and discussion for the upward signal of all subscriber equipmenies at the base station end, up to CDMA (code division multiple access) broad application.Cdma system is the self-interference system, and upward signal keeps helping synchronously improving the capacity and the performance of whole system in base station side, and its synchronous required precision is more much higher than gsm system.Based on this consideration, people have proposed the synchronous method of a kind of backward channel.In this method, when the forward synchronizing signal being delivered to all mobile radio stations of associated company in the base station, mobile radio station is to deliver to the base station with the reverse sync signal respectively with the mode of the forward synchronizing signal synchronised that is received.In case receive the reverse sync signal, the base station is then calculated for the time-delay of these mobile radio stations and with relative synchronous information and is delivered to separately mobile radio station.Based on this information, mobile radio station control respectively the channel signal of delivering to this base station synchronously.In the uplink synchronous technology in uplink synchronous transmission plan, time division CDMA (TD-CDMA) mobile communication system and TD SDMA (TD-SCDMA) mobile communication system of this method in the WCDMA mobile communication system, all require upward signal to keep synchronously in base station side.As shown in Figure 1, the enforcement environment schematic diagram of the uplink synchronous technology that is the present invention and is absorbed in.
In general, the uplink synchronous technology comprises initial synchronisation and the synchronous two parts of following the tracks of, as shown in Figure 2, realization flow schematic diagram for existing uplink synchronous technology, mainly comprise following several steps: step 21, the base station sends downlink synchronous signal, so that subscriber equipment obtains down-going synchronous; Step 22, subscriber equipment sends up initial synchronisation signal according to the situation of down-going synchronous; The initial synchronisation adjustment amount of subscriber equipment is obtained and sent to step 23, base station, so that subscriber equipment is adjusted up transmission regularly; Step 24, subscriber equipment is adjusted the adjusted signal of concurrent warp let-off initial synchronisation according to the initial synchronisation adjustment amount that receives, and through this step, the process of initial synchronisation has also just been finished; Step 25, whether base station assesses user equipment need be adjusted synchronously, and from this step, uplink synchronous enters synchronous tracking phase, and subscriber equipment is adjusted up timing and is then entered step 26 if desired, otherwise enters step 28; Step 26, base station are issued subscriber equipment synchronizing signal adjustment amount; Step 27, subscriber equipment is adjusted the signal that the concurrent warp let-off is adjusted synchronously according to the synchronizing signal adjustment amount, and flow process changes step 25 over to; Step 28, base station require subscriber equipment inhibit signal transmission timing, and this process can realize by the value that adjustment amount is set to prior mutual concession; Step 29, subscriber equipment sends the signal that keeps sequential, and flow process changes step 25 over to.
Be not difficult to find by this flow process,, also can only give tacit consent to the latter and be the desired adjustment amount in base station when the actual timing adjustment amount that need utilize subscriber equipment in base station side.To cause can facing at least the problem of two aspects like this: the one, owing to the adjustment amount that the reason of communication quality makes base station and subscriber equipment understand is different; The 2nd, owing to the reason of subscriber equipment makes adjustment amount can not reach the requirement of base station.And the actual timing adjustment amount of subscriber equipment is undoubtedly the basis whether further assesses user equipment in base station need be adjusted synchronously.Yet in this important step, existing the whole bag of tricks does not improve this process at present, makes the enforcement performance of uplink synchronous not be improved.
Summary of the invention
Technical problem to be solved by this invention is to provide the method for uplink synchronous in mobile communication system, so that uplink synchronous and up quasi synchronous mobile communication system can obtain better uplink synchronous effect, promote the capacity and the performance of mobile communication system.
May further comprise the steps for solving this technical problem technical scheme provided by the invention:
(1) carries out initial synchronisation between base station and the subscriber equipment, and in the adjusted signal of process initial synchronisation that subscriber equipment sends, comprise the applied initial synchronisation adjustment amount of subscriber equipment information;
(2) make comparisons the timing of the subscriber signal that receives in the base station with the desired timing of base station side, if timing difference greater than default thresholding, then carries out initial synchronisation with subscriber equipment once more, until timing difference less than default thresholding;
(3) follow the trail of synchronously between base station and the subscriber equipment, subscriber equipment send to keep the signal of sequential, or through synchronously adjusted, include the signal of the applied synchronous adjustment amount information of subscriber equipment, and return step (2) and re-execute.
Wherein step (1) comprising:
(a) base station sends downlink synchronous signal;
(b) subscriber equipment sends up initial synchronisation signal according to the situation of down-going synchronous;
(c) base station obtains and sends the initial synchronisation adjustment amount of subscriber equipment;
(d) subscriber equipment is adjusted the adjusted signal of concurrent warp let-off initial synchronisation according to the initial synchronisation adjustment amount that receives, and contains the applied initial synchronisation adjustment amount of subscriber equipment information in this signal.
Step (2) comprising:
(e1) determine the position in the signal footpath of the subscriber signal received at base station end desired value correspondence regularly;
(e2) from subscriber signal, obtain the applied synchronous adjustment amount of subscriber equipment, and send to the synchronous adjustment amount of subscriber equipment, determine the actual synchronization adjustment amount of subscriber equipment according to the base station;
(e3) according to described actual synchronization adjustment amount, utilize the energy of filter channel impulse response to received signal to carry out filtering, obtain sequence Y (n);
(e4) utilize the energy of most powerful path among noise energy and the sequence Y (n) that sequence Y (n) is carried out reprocessing to distinguish out noise path and effective diameter, and Y (n) composed to the Y ' of sequence as a result of Y (n) (n) in the locational value of non-noise path, Y ' (n) all the other locational values puts 0;
(e5) sequence Y ' (n) in the position in signal footpath of the described definite desired value correspondence of search;
(e6) directly go up actual RAKE energy according to this and the comparing result of the energy estimated by channel estimation results, the footpath that searches is confirmed, directly is false footpath if confirm this, then with the Y ' on the false path position (n) value put 0, and return step (e5), otherwise change step (e7) over to;
(e7) timing that will this footpath is done contrast with the desired timing of base station end, if timing difference greater than default thresholding, then the base station requires subscriber equipment to carry out initial synchronisation once more, until timing difference less than default thresholding.
Step (3) comprising:
(g) whether assesses user equipment in base station needs to adjust synchronously, if desired, and execution in step (h) then, otherwise, enter step (j);
(h) subscriber equipment synchronizing signal adjustment amount is issued in the base station;
(i) subscriber equipment is adjusted the signal that the concurrent warp let-off is adjusted synchronously according to the synchronizing signal adjustment amount, contains the applied synchronous adjustment amount information of subscriber equipment in this signal, returns step (2) and re-executes;
(j) base station requires subscriber equipment inhibit signal transmission timing;
(k) subscriber equipment sends the signal that keeps sequential, returns step (2) and re-executes.
The present invention uses the method that increases feedback mechanism in the uplink synchronous flow process to make the base station end can learn the timing adjustment amount of subscriber equipment accurately, thereby eliminated the deviation of estimating, reduced because of former thereby false probability directly of introducing such as noises by be shifted filtering technique and footpath verification technique simultaneously, the precision and the stability of uplink synchronous are greatly improved, and then the capacity of elevator system and performance.
Summary of drawings
Fig. 1 is the sub-district schematic diagram of mobile communication system;
Fig. 2 is existing uplink synchronous implementing procedure figure;
Fig. 3 is according to the described uplink synchronous schematic flow sheet of the embodiment of the invention;
Fig. 4 is the schematic flow sheet that whether need carry out initial synchronisation according to the described base station of embodiment of the invention assesses user equipment once more.
Preferred forms of the present invention
In order to improve the uplink synchronous performance, consider that it regularly is dynamically to adjust that the user sends, so the present invention has used the method that increases feedback mechanism in the uplink synchronous flow process to make the base station end can learn the timing adjustment amount of subscriber equipment accurately, so that eliminated the deviation of estimation, proposed the technology of displacement filtering and the method for footpath checking simultaneously and reduced because of former thereby false probability directly of introducing such as noises.
Uplink synchronisation method proposed by the invention all can apply to TD-CDMA, in the mobile communication system such as TD-SCDMA and WCDMA.Below in conjunction with accompanying drawing the enforcement of the present invention in TD-SCDMA is described, thereby illustrates technical characterictic of the present invention and function characteristics.
As shown in Figure 3, the implementation step of the present invention in TD-SCDMA is:
Step 30, the base station sends downlink synchronous signal by descending synchronous signal channel (DwPCH), so that subscriber equipment obtains down-going synchronous.
Step 31, subscriber equipment sends up initial synchronisation signal according to the situation of down-going synchronous by uplink synchronous channel (UpPCH);
Step 32, base station are obtained and are passed through the initial synchronisation adjustment amount that physical access channel (FPACH) sends subscriber equipment, so that subscriber equipment is adjusted up transmission regularly.
Step 33, subscriber equipment is adjusted the adjusted signal of concurrent warp let-off initial synchronisation according to the initial synchronisation adjustment amount that receives, as the case may be, this signal will be by Physical Random Access Channel (PRACH) or DPCH transmission such as (DPCH), in addition, can carry in this signal and contain the applied initial synchronisation adjustment amount of subscriber equipment information.
Step 34, whether base station assesses user equipment need carry out initial synchronisation once more, when the transmission timing of assesses user equipment, the actual timing adjustment amount that the last time requires the timing adjustment amount of subscriber equipment and subscriber equipment feedback need be taken all factors into consideration in the base station, if the base station needs timing adjustment amount that subscriber equipment carries out greater than certain thresholding, flow process enters step 35, otherwise enters step 36.
Step 35, once more initial synchronisation is carried out by the signaling request subscriber equipment in the base station, and this signaling can be carried on DPCH or the Secondary Common Control Physical Channel (S-CCPCH) etc.
Step 36, whether base station assesses user equipment need be adjusted synchronously, if step 34 needs synchronization timing adjustment that subscriber equipment carries out to adjust half of step-length greater than synchronization timing, flow process enters step 37, otherwise flow process enters step 39.
Step 37, the order that the subscriber equipment synchronizing signal is adjusted is issued by the simultaneous bias on the channels such as descending DPCH (SS) field in the base station, this process can realize by the value that the SS field is set to prior mutual concession, adjust a step-length forward as the 00 expression synchronization timing of employing in the QPSK modulation, and adopt 11 expression synchronization timings to adjust a step-length backward.
Step 38, subscriber equipment is adjusted the signal that the concurrent warp let-off is adjusted synchronously according to the order of synchronizing signal adjustment, and this signal is by the applied actual synchronization adjustment amount of SS field informing base station self on the channels such as up DPCH, and flow process changes step 34 over to.
Step 39, base station require subscriber equipment inhibit signal transmission timing, and this process can realize by the value that the SS field is set to prior mutual concession, as employing 01 when QPSK modulate, then adopts 011 when 8PSK.
Step 40, user device transmissions keep sending signal regularly, and fill corresponding value in the SS field, and flow process changes step 34 over to.
At when whether base station assesses user equipment need carry out this step of initial synchronisation once more, the present invention and then proposed to utilize displacement filtering and the footpath verification technique improves the mode of uplink synchronous performance, and its concrete implementation step can be as shown in Figure 4:
Step 341 is determined the subscriber signal received at base station end desired value regularly, for example can it be set to expect the position in the first footpath of received signal (Initial path), all equates for this desired value of all subscriber equipmenies this moment.
Step 342 is obtained the applied synchronous adjustment amount of subscriber equipment from subscriber signal, send to the synchronous adjustment amount of subscriber equipment in conjunction with the base station, thereby the substantial synchronization of obtaining subscriber equipment is adjusted situation.Base station side can adopt during concrete enforcement S = ∂ * S 1 + ( 1 - ∂ ) * S 2 Obtain the adjustment amount of final approval, wherein S 1For the base station last time requires the timing adjustment amount of subscriber equipment, S 2Be the actual timing adjustment amount of subscriber equipment feedback,
Figure G79858178150141000D000062
Be filter coefficient, but interval is [0,1], actual value can be according to the signal to noise ratio decision of communication link.
Step 343 utilizes the energy of filter channel impulse response to received signal to carry out filtering, obtains sequence Y (n) (being the sequence 1 in the accompanying drawing 4), need consider that when filtering the substantial synchronization of subscriber equipment is adjusted situation.The output sequence of supposing last filter is:
Z 1(n-1)，Z 2(n-1)，Z 3(n-1)，…，Z i(n-1)，…，Z I(n-1)
Wherein I is the length of filter output sequence, generally gets more than or equal to the long value of channel estimation window; N is the sequence number of the n time filtering, and for the 1st filtering, the output of filter can directly be set to value relevant with channel impulse response even channel impulse response itself.
If the energy sequence of the channel impulse response of definition input is X (n), then under the situation that adopts Alpha Alpha filter, have:
Z i(n)＝β*Y i(n-1)+(1-β)*X i(n)i＝1，2，…，I
Wherein β is the coefficient of Alpha filter, but interval is [0,1], can also adopt the method that becomes the Alpha filter coefficient at initial several frames of filtering, to improve convergence.
Suppose that then the output sequence that substantial synchronization adjustment amount that step 342 draws is reflected to filter is reach k, then defining Y (n-1) sequence is Y i(n-1)=Z I+k(n-1), 1≤i≤I-k wherein, and when i＞I-k, then with Y i(n-1) be set to the power of interference signal; Be reflected at the substantial synchronization adjustment amount that step 342 draws and move under the situation of k after the filter output sequence is, then defining Y (n-1) sequence is Y i(n-1)=Z I-k(n-1), k+1≤i≤I wherein, and when i≤k, then with Y i(n-1) be set to the power of interference signal; Suppose that the substantial synchronization adjustment amount that step 342 draws is 0, promptly do not adjust, then defined nucleotide sequence Y (n-1)=Z (n-1).
Step 344 utilizes the energy of most powerful path in noise energy and Y (n) sequence obtained above that Y (n) is carried out reprocessing to distinguish out noise path and effective diameter, is about to Y (n) and compares with interference signal, to distinguish out noise path and effective diameter; Then Y (n) is composed to another sequence Y (n) (being the sequence 2 in the accompanying drawing 4) in the locational value of non-noise path, Y (n) is actual to be a sequence as a result, therefore, does not have special character, just is used for carrying the result that Y (n) needs.Its size is identical with Y (n).All the other locational values of Y (n) put 0.Can thresholding be set by noise energy and most powerful path energy during practical operation, and think that the position less than this thresholding promptly is the position of noise path in Y (n) sequence.
Step 345 is searched for first position i directly according to numbering order from small to large in sequence Y (n), confirm for step 346.
Step 346 adopts this comparing result of directly going up actual RAKE energy and estimated energy that head is directly confirmed.The first path position that utilizes step 345 to obtain finds out the instantaneous channel estimation value on this footpath, just can calculate the energy P that this directly goes up RAKE by information such as instantaneous channel estimation value and spreading factors i(n), meanwhile, also can draw actual energy Q by on this footpath, directly carrying out the RAKE processing i(n), if Q i(n)＜K*P i(n) (wherein K is a parameter, but interval is (0,1)) thinks that then this directly is false footpath, and the value of i position put 0 (being step 348 among the figure) in Y (n) sequence, and changes step 345 over to, otherwise confirms that this directly for the first footpath of subscriber signal, enters step 347.
Step 347 is done contrast with the timing in head footpath with the desired timing of base station end, if the base station needs timing adjustment amount that subscriber equipment carries out greater than thresholding T, flow process enters step 35 among Fig. 3, and once more initial synchronisation is carried out by the signaling request subscriber equipment in the base station; Otherwise enter step 36 among Fig. 3, whether base station assesses user equipment need be adjusted synchronously; Wherein the interval of thresholding T is (16,16) chip.

Claims (13)

1. the uplink synchronous implementation method in the mobile communication system is characterized in that, comprises the steps:
(1) carries out initial synchronisation between base station and the subscriber equipment, and in the adjusted signal of process initial synchronisation that subscriber equipment sends, comprise the applied initial synchronisation adjustment amount of subscriber equipment information;
(2) make comparisons the timing of the subscriber signal that receives in the base station with the desired timing of base station side, if timing difference greater than default thresholding, then carries out initial synchronisation with subscriber equipment once more, until timing difference less than default thresholding;
(3) follow the trail of synchronously between base station and the subscriber equipment, subscriber equipment send to keep the signal of sequential, or through synchronously adjusted, include the signal of the applied synchronous adjustment amount information of subscriber equipment, and return step (2) and re-execute.
2. the method for claim 1 is characterized in that, described step (1) comprising:
(a) base station sends downlink synchronous signal;
(b) subscriber equipment sends up initial synchronisation signal according to the situation of down-going synchronous;
(c) base station obtains and sends the initial synchronisation adjustment amount of subscriber equipment;
(d) subscriber equipment is adjusted the adjusted signal of concurrent warp let-off initial synchronisation according to the initial synchronisation adjustment amount that receives, and contains the applied initial synchronisation adjustment amount of subscriber equipment information in this signal.
3. the method for claim 1 is characterized in that, described step (2) comprising:
(e1) determine the position in the signal footpath of the subscriber signal received at base station end desired value correspondence regularly;
(e2) from subscriber signal, obtain the applied synchronous adjustment amount of subscriber equipment, and send to the synchronous adjustment amount of subscriber equipment, determine the actual synchronization adjustment amount of subscriber equipment according to the base station;
(e3) according to described actual synchronization adjustment amount, utilize the energy of filter channel impulse response to received signal to carry out filtering, obtain sequence Y (n);
(e4) utilize the energy of most powerful path among noise energy and the sequence Y (n) that sequence Y (n) is carried out reprocessing to distinguish out noise path and effective diameter, and Y (n) composed to the Y ' of sequence as a result of Y (n) (n) in the locational value of non-noise path, Y ' (n) all the other locational values puts 0;
(e5) sequence Y ' (n) in the position in signal footpath of the described definite desired value correspondence of search;
(e6) directly go up actual RAKE energy according to this and the comparing result of the energy estimated by channel estimation results, the footpath that searches is confirmed, directly is false footpath if confirm this, then with the Y ' on the false path position (n) value put 0, and return step (e5), otherwise change step (e7) over to;
(e7) timing that will this footpath is done contrast with the desired timing of base station end, if timing difference greater than default thresholding, then the base station requires subscriber equipment to carry out initial synchronisation once more, until timing difference less than default thresholding.
4. the method for claim 1 is characterized in that, described step (3) comprising:
(g) whether assesses user equipment in base station needs to adjust synchronously, if desired, and execution in step (h) then, otherwise, enter step (j);
(h) subscriber equipment synchronizing signal adjustment amount is issued in the base station;
(i) subscriber equipment is adjusted the signal that the concurrent warp let-off is adjusted synchronously according to the synchronizing signal adjustment amount, contains the applied synchronous adjustment amount information of subscriber equipment in this signal, returns step (2) and re-executes;
(j) base station requires subscriber equipment inhibit signal transmission timing;
(k) subscriber equipment sends the signal that keeps sequential, returns step (2) and re-executes.
5. method as claimed in claim 3 is characterized in that, described step (e1) comprising:
Subscriber signal desired value regularly is set to expect the first position directly of received signal.
6. method as claimed in claim 3 is characterized in that, described step (e2) comprising:
Adopt Determine the actual synchronization adjustment amount, wherein, S 1For the base station last time requires the synchronous adjustment amount of subscriber equipment, S 2Be the synchronous adjustment amount of subscriber equipment practical application,
Figure FSB00000119269600012
Be filter coefficient.
7. method as claimed in claim 6 is characterized in that, and is described
Figure FSB00000070015700013
Interval be [0,1], actual value is according to the decision of the signal to noise ratio of communication link.
8. method as claimed in claim 3 is characterized in that, described step (e3) comprising:
If the output sequence of last filter is: Z 1(n-1), Z 2(n-1), Z 3(n-1) ..., Z i(n-1) ..., Z I(n-1), wherein I is the length of filter output sequence, and n is the sequence number of the n time filtering;
Be reach k if the definite actual synchronization adjustment amount of step (e2) is reflected to the output sequence of filter, then defining Y (n-1) sequence is Y i(n-1)=Z I+k(n-1), 1≤i≤I-k wherein, and when i＞I-k, then with Y i(n-1) be set to the power of interference signal;
Move k if the definite actual synchronization adjustment amount of step (e2) is reflected to after the output sequence of filter is, then defining Y (n-1) sequence is Y i(n-1)=Z I-k(n-1), k+1≤i≤I wherein, and when i≤k, then with Y i(n-1) be set to the power of interference signal;
If the definite actual synchronization adjustment amount of step (e2) is 0, defined nucleotide sequence Y (n-1)=Z (n-1) then;
If the energy sequence of the channel impulse response of input is X (n), then under the situation that adopts the Alpha filter, have:
Z i(n)＝β*Y i(n-1)+(1-β)*X i(n) i＝1，2，…，I
Wherein β is the coefficient of Alpha filter.
9. method as claimed in claim 3 is characterized in that, described step (e4) comprising:
By noise energy and most powerful path energy thresholding being set, is to be the position of noise path with the location confirmation less than this thresholding in Y (n) sequence.
10. method as claimed in claim 3 is characterized in that, described step (e5) comprising:
According to numbering order from small to large sequence Y ' (n) in the signal position directly of the described definite desired value correspondence of search.
11. method as claimed in claim 3 is characterized in that, described step (e6) comprising:
According to the signal path position that step (e5) finds, find out the instantaneous channel estimation value on this footpath;
According to described instantaneous channel estimation value, calculate the energy P that this directly goes up RAKE i(n);
Handle by on this footpath, directly carrying out RAKE, obtain actual energy Q i(n);
If Q i(n)＜K*P i(n), wherein K is a parameter, thinks that then this directly is false footpath, and (n) in the sequence value of i position is put 0 at Y ', and change step (e5) over to, otherwise change step (e7) over to.
12. method as claimed in claim 11 is characterized in that, the interval of described K is (0,1).
13. the method for claim 1 is characterized in that, the interval of the described default thresholding of step (2) is (16,16) chip.
CN2005800499324A 2005-11-16 2005-11-16 Uplink synchronization method in mobile communication system Expired - Fee Related CN101185270B (en)

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