CN101087173A - A synchronization monitoring method and device of TD-SCDMA terminal - Google Patents
A synchronization monitoring method and device of TD-SCDMA terminal Download PDFInfo
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- CN101087173A CN101087173A CNA2007101185594A CN200710118559A CN101087173A CN 101087173 A CN101087173 A CN 101087173A CN A2007101185594 A CNA2007101185594 A CN A2007101185594A CN 200710118559 A CN200710118559 A CN 200710118559A CN 101087173 A CN101087173 A CN 101087173A
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Abstract
The invention provides a method and device for the synchronies monitoring of TD-SCDMA terminal in TD-SCDMA system, which is used to monitor the synchronies state of TD-SCDMA system. Said method includes: the TD-SCDMA terminal evaluates the channels according to the SYNC-DL code in received TD-SCDMA sub-frame to get the evaluation result of channel, and obtains the evaluation result of real channel from the evaluation result of channel; choose an efficient route which can accord with the desired condition from said evaluation result of real channel, and calculates the ratio between signal power and noise power according to the evaluation result of channel, the evaluation result of real channel, and the efficient route; the TD-SCDMA terminal judges the present state is normal or not according to the ratio between signal power and noise power. Following said method and device, it can improve the reliability and efficiency of synchronies time regulation.
Description
Technical field
The present invention relates to wireless communication technology field, the method and the device of the monitoring of particularly a kind of Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, Time-Division Synchronization Code Division Multiple Access) terminal synchronizes.
Background technology
TD-SCDMA is a time-division-synchronization code multi-address division system, and the synchronization accuracy of terminal and base station reaches as high as the precision of 1/8 chip.In order to reach than higher synchronization accuracy and reasonable synchronous effect, terminal needs according to receiving signal (perhaps handling to received signal, according to the result) cycle of carrying out/aperiodic synchronization timing adjustment.When the signal quality that causes terminal to receive when reasons such as wireless environment deteriorations is poor,, will causes bigger synchronism deviation, even can influence the operate as normal of terminal if still carry out the synchronization timing adjustment according to this signal that receives this moment.Therefore, the current synchronous regime of terminal is monitored in real time, and before carrying out the synchronization timing adjustment, the validity when the preamble adjustment is judged, very necessary for the operate as normal of terminal.
Summary of the invention
Technical problem to be solved by this invention provides the method and apparatus of TD-SCDMA terminal synchronizes monitoring in a kind of TD-SCDMA system, is used for the synchronous regime of TD-SCDMA terminal is monitored.
For solving the problems of the technologies described above, it is as follows to the invention provides scheme:
A kind of method of TD-SCDMA terminal synchronizes monitoring may further comprise the steps:
Steps A, the TD-SCDMA terminal is carried out channel estimating according to the down-going synchronous SYNC-DL sign indicating number in the TD-SCDMA subframe that receives, and obtains channel estimation results, and obtain the actual channel estimated result from described channel estimation results;
Step B selects the effective diameter that conforms to a predetermined condition from described actual channel estimated result, and according to described channel estimation results, actual channel estimated result and effective diameter, the ratio of signal calculated power and noise power;
Step C, the TD-SCDMA terminal judges according to the ratio of described signal power and noise power whether the current synchronous regime of terminal is normal.
Method of the present invention, wherein,
In the described steps A, describedly carry out channel estimating according to the SYNC-DL sign indicating number and comprise:
Respectively SYNC-DL sign indicating number and the local SYNC-DL sign indicating number that receives carried out Fourier transform, obtain corresponding frequency domain sequence;
The frequency domain sequence of the frequency domain sequence of the SYNC-DL that receives and local SYNC-DL sign indicating number is carried out contraposition be divided by, obtain the contraposition value of being divided by, again the contraposition value of being divided by is carried out inverse Fourier transform, obtain channel estimation results.
Method of the present invention, wherein, in the described steps A, the described actual channel estimated result that obtains from described channel estimation results is, according to the structure and the actual channel estimated length of the SYNC-DL sign indicating number that is used for the calculating channel estimation, from channel estimation results, select the actual channel estimated result.
Method of the present invention, wherein, among the described step B, the described effective diameter that conforms to a predetermined condition of selecting from the actual channel estimated result comprises:
From described actual channel estimated result, select the prominent PathNum bar of part footpath, from described PathNum bar footpath, select the effective diameter that conforms to a predetermined condition again.
Method of the present invention, wherein, among the described step B, described noise power is the average powers of removing all footpaths behind the actual channel estimated result in the described channel estimation results; Described signal power is the power sum of all effective diameters.
Method of the present invention, wherein, among the described step B, described predetermined condition comprises: the power of effective diameter is greater than the power in prominent footpath in all effective diameters and the product of first threshold parameter; The power of effective diameter is greater than the product of the described noise power and second threshold parameter; The location point deviation in prominent footpath is less than the 3rd threshold parameter in effective diameter and all effective diameters.
Method of the present invention, wherein, described step C specifically comprises:
If the ratio of described signal power and noise power, judges then that the current synchronous regime of terminal is unusual less than the 4th threshold value; Otherwise, judge that the current synchronous regime of terminal is normal.
Method of the present invention, wherein,
Among the described step B, the TD-SCDMA terminal further writes down the location point of article one effective diameter in all effective diameters;
Among the described step C, the TD-SCDMA terminal is further calculated article one effective diameter of current record and the location point deviation between the last article one effective diameter that writes down, and according to described location point deviation, judges whether the current synchronous regime of terminal is normal.
Method of the present invention, wherein, described step C specifically comprises:
If the ratio of described signal power and noise power is less than the 4th threshold value, perhaps described location point deviation judges then that greater than the 5th threshold value the current synchronous regime of terminal is unusual; Otherwise, judge that the current synchronous regime of terminal is normal.
Method of the present invention wherein, among the described step C, further when judging that the current synchronous regime of terminal is unusual, forbids that terminal carries out the synchronization timing adjustment; And judging the current synchronous regime of terminal just often, allow terminal to carry out the synchronization timing adjustment.
A kind of device of TD-SCDMA terminal synchronizes monitoring comprises: channel estimator, first footpath are detected and snr computation device and synchronous regime watch-dog, wherein,
Described channel estimator is used for carrying out channel estimating according to the SYNC-DL sign indicating number of the TD-SCDMA subframe that receives, and obtains channel estimation results, and obtain the actual channel estimated result from described channel estimation results;
Described first footpath is detected and the snr computation device, be used for selecting the effective diameter that conforms to a predetermined condition from the actual channel estimated result that described channel estimator obtains, and according to described channel estimation results, actual channel estimated result and effective diameter, the ratio of signal calculated power and noise power;
Described synchronous regime watch-dog is used for detecting the signal power that obtains with the snr computation device and the ratio of noise power according to described first footpath, judges whether the current synchronous regime of terminal is normal.
Device of the present invention, wherein,
Described channel estimator is further used for structure and actual channel estimated length according to the SYNC-DL sign indicating number that is used for the calculating channel estimation, the actual channel estimated result of selecting from channel estimation results.
Device of the present invention, wherein,
Described synchronous regime watch-dog when being further used for ratio in described signal power and noise power less than the 4th threshold value, judges that the current synchronous regime of terminal is unusual; During greater than the 4th threshold value, judge that the current synchronous regime of terminal is normal at the ratio of described signal power and noise power.
Device of the present invention, wherein, described first footpath is detected with the snr computation implement body and is comprised:
The effective diameter selected cell is used for selecting the effective diameter that conforms to a predetermined condition the prominent PathNum bar of the part footpath of the actual channel estimated result that obtains from described channel estimator;
The signal power computing unit is used for the power sum signal calculated power according to all effective diameters;
The noise power calculation unit, the average powers that are used for removing according to described channel estimation results all footpaths behind the actual channel estimated result are calculated described noise power;
The snr computation unit is used for the noise power that the signal power that obtains according to described signal power computing unit and noise power calculation unit obtain, and calculates the ratio of described signal power and noise power.
Device of the present invention, wherein, described effective diameter selected cell is used for selecting the described predetermined condition of effective diameter to comprise: the power of effective diameter is greater than the power in all prominent footpaths of effective diameter and the product of first threshold parameter; The power of effective diameter is greater than the product of the noise power and second threshold parameter; The location point deviation in prominent footpath is less than the 3rd threshold parameter in effective diameter and all effective diameters.
Device of the present invention, wherein, described first footpath is detected with the snr computation device and is further comprised first path position record cell, is used for writing down the location point of article one effective diameter of selected all effective diameters of described effective diameter selected cell;
Described synchronous regime watch-dog, be further used for location point according to article one effective diameter of described first path position recording unit records, calculate article one effective diameter of current record and the location point deviation between the last article one effective diameter that writes down, and, judge whether the current synchronous regime of terminal is normal according to described location point deviation.
Device of the present invention, wherein, described synchronous regime watch-dog, further at the ratio of described signal power and noise power less than the 4th threshold value, perhaps described location point deviation judges that the current synchronous regime of terminal is unusual during greater than the 5th threshold value; Otherwise, judge that the current synchronous regime of terminal is normal.
Device of the present invention, wherein, described synchronous regime watch-dog is further used for when the current synchronous regime of terminal is unusual, forbids that terminal carries out the synchronization timing adjustment; And in the current synchronous regime of terminal just often, allow terminal to carry out the synchronization timing adjustment.
From the above as can be seen, the method and apparatus of TD-SCDMA terminal synchronizes monitoring provided by the invention, carry out channel estimating according to the SYNC-DL sign indicating number, calculate the location point of article one effective diameter of signal to noise ratio and record according to channel estimation results, and then whether the current synchronous regime of judging terminal is normal, and when synchronous regime is unusual, forbid the synchronization timing adjustment, thus improved reliability and validity that synchronization timing is adjusted, guaranteed the operate as normal of terminal.
Description of drawings
Fig. 1 is a TD-SCDMA system frame structure schematic diagram;
Fig. 2 is the flow chart of the method for the described TD-SCDMA terminal synchronizes monitoring of the invention process;
Fig. 3 is the structural representation of LocSync in the embodiment of the invention;
Fig. 4 is the concrete structure schematic diagram of LocSync in the embodiment of the invention;
Fig. 5 is the structure chart of the device of the described TD-SCDMA terminal synchronizes monitoring of the embodiment of the invention;
Fig. 6 is the structure chart of described first footpath detection of the embodiment of the invention and snr computation device.
Embodiment
The invention provides the method and apparatus of TD-SCDMA terminal synchronizes monitoring in a kind of TD-SCDMA system, the synchronous regime that terminal is current is monitored, and judged whether to carry out the synchronization timing adjustment according to current synchronous regime.The present invention is described in detail by specific embodiment below in conjunction with accompanying drawing.
At first; introduce the TD-SCDMA system frame structure; as shown in Figure 1; the length of a TDMA subframe is 5ms; each subframe is divided into 7 business time-slots (TS0-TS6) and 3 special time slots that length is 675us again: descending pilot frequency time slot (DwPTS; Downlink Pilot Time Slot), protection interval (GP) and uplink pilot time slot (UpPTS, Uplink Pilot Time Slot).Wherein TS0 always distribute to down link (DL, Downlink), and TS1 always distribute to up link (UL, Uplink).Down-going synchronous (SYNC-DL) sign indicating number is arranged in DwPTS, and length is 64 chips.
Please refer to Fig. 2, the flow chart for the method for the described TD-SCDMA terminal synchronizes of the invention process monitoring may further comprise the steps:
Here, the channel estimation method that can be used for channel estimating has multiple, in the present embodiment, provides a kind of algorithm of estimating based on single cell channel of Fourier transformation computation:
h
Sync'=IFFT (FFT (RecSync) ./FFT (LocSync)), wherein,
RecSync represents the SYNC-DL sign indicating number that terminal receives, LocSync represents to be used for the SYNC-DL sign indicating number of this locality that calculating channel estimates, FFT represents fast fourier transform (or Fourier transform), IFFT represents fast adverse Fourier transform (or inverse Fourier transform), ./expression contraposition is divided by (point removes), h
Sync' expression is at the channel estimation results of RecSync, and it is a sequence with the RecSync equal in length.In the TD-SCDMA system, the representative value of actual channel estimated length is 16, therefore, only gets h here
Sync' in 16 as actual channel estimated result h
Sync
Here, it is to be noted, in the actual communication systems, for the SYNC-DL sign indicating number that makes reception is not lost any information, when receiving the SYNC-DL sign indicating number, the chip lengths of actual reception is greater than 64 chips usually, for example, the GP of each 32 chip of SYNC-DL sign indicating number two ends is received in the lump, at this moment, the total reception length of SYNC-DL sign indicating number is 128 (128 is 2 integral number power, so that use Fourier transformation computation) chip.By frame structure as can be known, under the situation of not introducing the adjacent time-slots interference, the reception length range of SYNC-DL sign indicating number is between 64～(32+64+96) chips, promptly between 64～192 chips.When the reception length of SYNC-DL sign indicating number was greater than 64, when promptly the length of RecSync was greater than 64 chips, this moment, LocSync should be configured to have with RecSync the structure of equal length.For example, when receiving the SYNC-DL sign indicating number, if the GP of each 32 chip of its two ends receives into (total length is 128 chips) in the lump, at this moment, be used for channel estimating local SYNC-DL sign indicating number LocSync structure as shown in Figure 3, promptly need increase totally 64 chips, front end N chip wherein, the individual chip in rear end (128-64-N) at the SYNC-DL of this locality sign indicating number two ends; Then, the channel estimation results h that calculates according to this RecSync and LocSync
Sync', and according to following formula from h
Sync' 128 in take out at 16 as actual channel estimated result h
Sync:
h
Sync′[k]＝h
Sync′[((32-N)mod128)+k]k＝1，…16，
In the following formula, mod represents the surplus computing of mould.For example, at N=32, i.e. the structure of LocSync as shown in Figure 4 the time, at this moment, h
SyncGet h
Sync' preceding 16 points, that is, and h
Sync=h
Sync' (1: 16).
In order to be without loss of generality, suppose the h that calculates by channel estimator (concrete channel estimation method is not limited to the algorithm based on Fourier transform in the present embodiment) here
Sync' sequence length be L, the actual channel estimated length is W, then can be with h
Sync' with h
SyncCorresponding relation be:
h
Sync′[k]＝h
Sync′[f(k)] k＝1，…，W
Wherein, f (k) is and is used for the SYNC-DL sign indicating number that calculating channel is estimated, comprises RecSync and LocSync, the function of structurally associated.
Here,, can from described channel estimation results, select the prominent PathNum bar of part footpath earlier, from described PathNum bar footpath, select the effective diameter that conforms to a predetermined condition again in order to reduce operand.With h
Sync=h
Sync' (1: 16) illustrates: h
SyncIn comprise 16 points altogether, each point corresponds respectively to a footpath.Power on every footpath can be according to plural h
SyncThe mould of ' [k] square | h
Sync[k]
2, k=1 ..., 16 calculate.At first, from 16 footpaths, select prominent PathNum bar footpath (PathNum is a numeric parameter, and recommended value is 4～6), prominent PathNum bar performance number and relevant position point thereof directly be expressed as follows:
P
max，1＞P
max，2＞…＞P
max，PathNum
pos
max，1，pos
max，2，…，pos
max，PathNum
In the following formula, P
Max, n, n=1 ..., PathNum represents the power on each footpath in the prominent PathNum bar footpath, po respectively
Smax, n, n=1 ..., PathNum represents the location point in each footpath in the prominent PathNum bar footpath.For example, when prominent footpath be at the 8th point (h
SyncWhen [8]) going up, this location point is 8.
Then, the effective diameter that selection conforms to a predetermined condition from above-mentioned PathNum bar footpath again.Here, described predetermined condition can be set to:
Above-mentioned condition can be expressed as: the power of effective diameter is greater than the power (P in prominent footpath in all effective diameters
Max, 1) and the first threshold parameter (T
1) product; The power of effective diameter is greater than noise power (P
Noise) and the second threshold parameter (T
2) product; The location point deviation in prominent footpath is less than the 3rd threshold parameter (T in effective diameter and all effective diameters
Pos).Here, T
1Be one less than 1 real number, recommended value is 0.0625; T
2Be one greater than 1 real number, recommended value is 8; T
PosBe one greater than 0 integer, recommended value is 4.Wherein, described noise power P
NoiseBe the average powers of removing all footpaths behind the actual channel estimated result in the described channel estimation results, that is:
In the following formula, L is channel estimation results h
Sync' sequence length, W is the sequence length that actual channel is estimated;
Then, the performance number and the relevant position point thereof that will meet the m bar effective diameter of described predetermined condition is designated as:
Pvalid
1，Pvalid
2，…，Pvalid
m
Posvalid
1，Posvalid
2，…，Posvalid
m
In the following formula, Pvald
n, n=1 ..., m represents the power of each effective diameter, Posvald
1, n=1 ..., m represents the location point of each effective diameter.
At last, signal calculated power and noise power P
NoiseRatio SNR.Wherein, described signal power is the power sum of all effective diameters, promptly
Therefore,
Simultaneously, write down the location point of article one effective diameter in all effective diameters.Described article one effective diameter is meant that article one arrives the footpath, i.e. the footpath of location point minimum in all effective diameters can be determined according to following formula:
FirstPathPos＝min{Posvalid
1，Posvalid
2…Posvalid
m}
Here, the TD-SCDMA terminal can be judged current synchronous regime according to SNR or described location point deviation, also can judge according to above-mentioned two conditions simultaneously, thereby make the judgement of synchronous regime more accurate, reliably.
Here, the location point of article one effective diameter of described last record, be before this record on the location point of article one effective diameter of once being write down during synchronization monitoring.For example, can be the location point of article one effective diameter of a last subframe of current subframe.
Here, use FirstPathPos
CurrentThe location point of article one effective diameter of expression current record is used FirstPathPos
LastThe location point of article one effective diameter of the last record of expression, the algorithm of synchronous regime monitoring can be expressed as:
if?|FirstPathPos
current-FirstPathPos
last|＞ScopeLimit
Monitor?or?SNR＜T
SNR
StateFlag＝1；
Stop?adjust?timing；
else
StateFlag＝0；
Permit?adjusting?timing；
FirstPathPos
last＝FirstPathPos
current；
In the following formula, ScopeLimit
MonitorBe the thresholding of location point deviation, it be one greater than 0 integer, recommended value is 6.T
SNRBe a signal-noise ratio threshold, it be one greater than 0 real number, recommended value is 32.StateFlag is the current synchronous regime sign of terminal.The implication of following formula be if the absolute value of the location point deviation between adjacent twice article one effective diameter greater than ScopeLimit
MonitorPerhaps current SNR value is less than T
SNR, synchronization monitoring is output as StateFlag=1 so, and it is unusual to represent that current synchronous regime occurs, and at this moment, forbids that terminal carries out the synchronization timing adjustment; Otherwise StateFlag=0 represents that current synchronous regime is normal, allows terminal to carry out the synchronization timing adjustment.The meaning of above-mentioned two conditions is, when signal to noise ratio hour, therefore the poor signal quality of the current reception of expression terminal should not carry out the synchronization timing adjustment; Because too big variation can not take place the signal accepting state of terminal usually, therefore when bigger change takes place the location point of described article one effective diameter, also should not carry out the synchronization timing adjustment.
Above embodiment has illustrated the method for TD-SCDMA terminal synchronizes monitoring of the present invention.In this embodiment, by monitor current signal to noise ratio according to channel estimation results, and judge according to the location point deviation between adjacent twice article one effective diameter whether the current synchronous regime of terminal is normal, indicate and currently whether can carry out the synchronization timing adjustment, thereby make that the synchronization timing adjustment of terminal is more reliable and effective.
Method based on above-mentioned TD-SCDMA terminal synchronizes monitoring, present embodiment also provides a kind of device of TD-SCDMA terminal synchronizes monitoring, and as shown in Figure 5, this device comprises: channel estimator, first footpath are detected and snr computation device and synchronous regime watch-dog, wherein
Described channel estimator is used for carrying out channel estimating according to the SYNC-DL sign indicating number of the TD-SCDMA subframe that receives, and obtains channel estimation results, and obtain the actual channel estimated result from described channel estimation results.Here, described channel estimator is further used for structure and actual channel estimated length according to the SYNC-DL sign indicating number that is used for the calculating channel estimation, the actual channel estimated result of selecting from channel estimation results.
Described first footpath is detected and the snr computation device, be used for selecting the effective diameter that conforms to a predetermined condition from the actual channel estimated result that described channel estimator obtains, and according to described channel estimation results, actual channel estimated result and effective diameter, the ratio of signal calculated power and noise power.
Described synchronous regime watch-dog is used for detecting the signal power that obtains with the snr computation device and the ratio of noise power according to described first footpath, judges whether the current synchronous regime of terminal is normal.Here, described synchronous regime watch-dog when being further used for ratio in described signal power and noise power less than the 4th threshold value, judges that the current synchronous regime of terminal is unusual; During greater than the 4th threshold value, judge that the current synchronous regime of terminal is normal at the ratio of described signal power and noise power.Described synchronous regime watch-dog can also be further used for when the current synchronous regime of terminal is unusual, forbids that terminal carries out the synchronization timing adjustment; And in the current synchronous regime of terminal just often, allow terminal to carry out the synchronization timing adjustment.
As shown in Figure 6, described first footpath is detected with the snr computation device and can specifically be comprised again: effective diameter selected cell, signal power computing unit, noise power calculation unit, snr computation unit and first path position record cell, wherein,
Described effective diameter selected cell is used for selecting the effective diameter that conforms to a predetermined condition the prominent PathNum bar of the part footpath of the actual channel estimated result that obtains from described channel estimator.Here, described effective diameter selected cell is used for selecting the described predetermined condition of effective diameter to comprise: the power of effective diameter is greater than the power in all prominent footpaths of effective diameter and the product of first threshold parameter; The power of effective diameter is greater than the product of the noise power and second threshold parameter; The location point deviation in prominent footpath is less than the 3rd threshold parameter in effective diameter and all effective diameters.
Described signal power computing unit is used for the power sum signal calculated power according to all effective diameters.
Described noise power calculation unit, the average powers that are used for removing according to described channel estimation results all footpaths behind the actual channel estimated result are calculated described noise power.
Described snr computation unit is used for the noise power that the signal power that obtains according to described signal power computing unit and noise power calculation unit obtain, and calculates the ratio of described signal power and noise power.
Described first path position record cell is used for writing down the location point of article one effective diameter of selected all effective diameters of described effective diameter selected cell.
Here, described synchronous regime watch-dog, also be further used for location point according to article one effective diameter of described first path position recording unit records, calculate article one effective diameter of current record and the location point deviation between the last article one effective diameter that writes down, and, judge whether the current synchronous regime of terminal is normal according to described location point deviation.For example, less than the 4th threshold value, perhaps described location point deviation judges that the current synchronous regime of terminal is unusual during greater than the 5th threshold value at the ratio of described signal power and noise power; Otherwise, judge that the current synchronous regime of terminal is normal.
The method and apparatus of TD-SCDMA terminal synchronizes monitoring of the present invention below has been described respectively, has reached device according to the method described above, the present invention can monitor the synchronous regime of terminal, and carries out the synchronization timing adjustment for terminal and select suitable opportunity.
Should be noted that at last, the method and apparatus of TD-SCDMA terminal synchronizes monitoring of the present invention, be not restricted to listed utilization in specification and the execution mode, it can be applied to various suitable the present invention's field fully, for those skilled in the art, can easily realize additional advantage and make amendment, therefore under the situation of the spirit and scope of the universal that does not deviate from claim and equivalency range and limited, the examples shown that the present invention is not limited to specific details, representational equipment and illustrates here and describe.
Claims (18)
1. the method for a TD-SCDMA terminal synchronizes monitoring is characterized in that, may further comprise the steps:
Steps A, the TD-SCDMA terminal is carried out channel estimating according to the down-going synchronous SYNC-DL sign indicating number in the TD-SCDMA subframe that receives, and obtains channel estimation results, and obtain the actual channel estimated result from described channel estimation results;
Step B selects the effective diameter that conforms to a predetermined condition from described actual channel estimated result, and according to described channel estimation results, actual channel estimated result and effective diameter, the ratio of signal calculated power and noise power;
Step C, the TD-SCDMA terminal judges according to the ratio of described signal power and noise power whether the current synchronous regime of terminal is normal.
2. the method for claim 1 is characterized in that,
In the described steps A, describedly carry out channel estimating according to the SYNC-DL sign indicating number and comprise:
Respectively SYNC-DL sign indicating number and the local SYNC-DL sign indicating number that receives carried out Fourier transform, obtain corresponding frequency domain sequence;
The frequency domain sequence of the frequency domain sequence of the SYNC-DL that receives and local SYNC-DL sign indicating number is carried out contraposition be divided by, obtain the contraposition value of being divided by, again the contraposition value of being divided by is carried out inverse Fourier transform, obtain channel estimation results.
3. the method for claim 1, it is characterized in that, in the described steps A, the described actual channel estimated result that obtains from described channel estimation results is, according to the structure and the actual channel estimated length of the SYNC-DL sign indicating number that is used for the calculating channel estimation, from channel estimation results, select the actual channel estimated result.
4. the method for claim 1 is characterized in that, among the described step B, the described effective diameter that conforms to a predetermined condition of selecting from the actual channel estimated result comprises:
From described actual channel estimated result, select the prominent PathNum bar of part footpath, from described PathNum bar footpath, select the effective diameter that conforms to a predetermined condition again.
5. the method for claim 1 is characterized in that, among the described step B, described noise power is the average powers of removing all footpaths behind the actual channel estimated result in the described channel estimation results; Described signal power is the power sum of all effective diameters.
6. method as claimed in claim 5 is characterized in that, among the described step B, described predetermined condition comprises: the power of effective diameter is greater than the power in prominent footpath in all effective diameters and the product of first threshold parameter; The power of effective diameter is greater than the product of the described noise power and second threshold parameter; The location point deviation in prominent footpath is less than the 3rd threshold parameter in effective diameter and all effective diameters.
7. the method for claim 1 is characterized in that, described step C specifically comprises:
If the ratio of described signal power and noise power, judges then that the current synchronous regime of terminal is unusual less than the 4th threshold value; Otherwise, judge that the current synchronous regime of terminal is normal.
8. the method for claim 1 is characterized in that,
Among the described step B, the TD-SCDMA terminal further writes down the location point of article one effective diameter in all effective diameters;
Among the described step C, the TD-SCDMA terminal is further calculated article one effective diameter of current record and the location point deviation between the last article one effective diameter that writes down, and according to described location point deviation, judges whether the current synchronous regime of terminal is normal.
9. method as claimed in claim 8 is characterized in that, described step C specifically comprises:
If the ratio of described signal power and noise power is less than the 4th threshold value, perhaps described location point deviation judges then that greater than the 5th threshold value the current synchronous regime of terminal is unusual; Otherwise, judge that the current synchronous regime of terminal is normal.
10. as each described method of claim 1 to 9, it is characterized in that, among the described step C, further when judging that the current synchronous regime of terminal is unusual, forbid that terminal carries out the synchronization timing adjustment; And judging the current synchronous regime of terminal just often, allow terminal to carry out the synchronization timing adjustment.
11. the device of a TD-SCDMA terminal synchronizes monitoring is characterized in that comprising: channel estimator, first footpath are detected and snr computation device and synchronous regime watch-dog, wherein,
Described channel estimator is used for carrying out channel estimating according to the SYNC-DL sign indicating number of the TD-SCDMA subframe that receives, and obtains channel estimation results, and obtain the actual channel estimated result from described channel estimation results;
Described first footpath is detected and the snr computation device, be used for selecting the effective diameter that conforms to a predetermined condition from the actual channel estimated result that described channel estimator obtains, and according to described channel estimation results, actual channel estimated result and effective diameter, the ratio of signal calculated power and noise power;
Described synchronous regime watch-dog is used for detecting the signal power that obtains with the snr computation device and the ratio of noise power according to described first footpath, judges whether the current synchronous regime of terminal is normal.
12. device as claimed in claim 11 is characterized in that,
Described channel estimator is further used for structure and actual channel estimated length according to the SYNC-DL sign indicating number that is used for the calculating channel estimation, the actual channel estimated result of selecting from channel estimation results.
13. device as claimed in claim 11 is characterized in that,
Described synchronous regime watch-dog when being further used for ratio in described signal power and noise power less than the 4th threshold value, judges that the current synchronous regime of terminal is unusual; During greater than the 4th threshold value, judge that the current synchronous regime of terminal is normal at the ratio of described signal power and noise power.
14. device as claimed in claim 11 is characterized in that, described first footpath is detected with the snr computation implement body and is comprised:
The effective diameter selected cell is used for selecting the effective diameter that conforms to a predetermined condition the prominent PathNum bar of the part footpath of the actual channel estimated result that obtains from described channel estimator;
The signal power computing unit is used for the power sum signal calculated power according to all effective diameters;
The noise power calculation unit, the average powers that are used for removing according to described channel estimation results all footpaths behind the actual channel estimated result are calculated described noise power;
The snr computation unit is used for the noise power that the signal power that obtains according to described signal power computing unit and noise power calculation unit obtain, and calculates the ratio of described signal power and noise power.
15. device as claimed in claim 14 is characterized in that, described effective diameter selected cell is used for selecting the described predetermined condition of effective diameter to comprise: the power of effective diameter is greater than the power in all prominent footpaths of effective diameter and the product of first threshold parameter; The power of effective diameter is greater than the product of the noise power and second threshold parameter; The location point deviation in prominent footpath is less than the 3rd threshold parameter in effective diameter and all effective diameters.
16. device as claimed in claim 14, it is characterized in that, described first footpath is detected with the snr computation device and is further comprised first path position record cell, is used for writing down the location point of article one effective diameter of selected all effective diameters of described effective diameter selected cell;
Described synchronous regime watch-dog, be further used for location point according to article one effective diameter of described first path position recording unit records, calculate article one effective diameter of current record and the location point deviation between the last article one effective diameter that writes down, and, judge whether the current synchronous regime of terminal is normal according to described location point deviation.
17. device as claimed in claim 16, it is characterized in that, described synchronous regime watch-dog, further at the ratio of described signal power and noise power less than the 4th threshold value, perhaps described location point deviation judges that the current synchronous regime of terminal is unusual during greater than the 5th threshold value; Otherwise, judge that the current synchronous regime of terminal is normal.
18., it is characterized in that described synchronous regime watch-dog is further used for when the current synchronous regime of terminal is unusual as each described device of claim 11 to 17, forbid that terminal carries out the synchronization timing adjustment; And in the current synchronous regime of terminal just often, allow terminal to carry out the synchronization timing adjustment.
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| CN2007101185594A CN101087173B (en) | 2007-07-09 | 2007-07-09 | A synchronization monitoring method and device of TD-SCDMA terminal |
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| CN2007101185594A CN101087173B (en) | 2007-07-09 | 2007-07-09 | A synchronization monitoring method and device of TD-SCDMA terminal |
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| CN101087173B CN101087173B (en) | 2010-10-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103024795A (en) * | 2011-09-27 | 2013-04-03 | 鼎桥通信技术有限公司 | Method for detecting abnormal synchronous timing in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1856950A (en) * | 2003-09-30 | 2006-11-01 | 美商内数位科技公司 | Efficient frame tracking in mobile receivers |
| CN1992556B (en) * | 2005-12-27 | 2010-12-29 | 展讯通信（上海）有限公司 | Method and system for uplink synchronization |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103024795A (en) * | 2011-09-27 | 2013-04-03 | 鼎桥通信技术有限公司 | Method for detecting abnormal synchronous timing in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) |
| CN103024795B (en) * | 2011-09-27 | 2015-08-05 | 鼎桥通信技术有限公司 | The detection method of synchronization timing exception in a kind of TD-SCDMA |
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| CN101087173B (en) | 2010-10-13 |
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