CN104735750A - Cell searching method and terminal - Google Patents
Cell searching method and terminal Download PDFInfo
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- CN104735750A CN104735750A CN201310713491.XA CN201310713491A CN104735750A CN 104735750 A CN104735750 A CN 104735750A CN 201310713491 A CN201310713491 A CN 201310713491A CN 104735750 A CN104735750 A CN 104735750A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
Abstract
The invention relates to a cell searching method and terminal. Under a strong signal environment, the terminal can complete cell searching as soon as possible. Under a weak signal environment, correlation peak value combined gains in received data are increased to improve the cell searching performance. The method comprises the steps that S1, data are received from the first frequency point of ranked N frequency points, cell detection is carried out after the n0<th> data of the frequency point are received until cell searching succeeds or the moment that the N frequency points are detected, and when the N frequency points are detected and the cell searching does not succeed, S2 is executed, wherein N is an integer larger than 1, n0 is an integer larger than 0 and is the number of received data of the frequency points under the preset strong signal environment, and the strong signal environment refers to the environment with the signal to noise ratio larger than a preset signal to noise ratio threshold; S2 is basically identical with S1, and the difference between S2 and S1 is that the number of received PSS data of the frequency points is adjusted to n1 from n0, wherein n1 is the number of received data of the frequency points under the preset weak signal environment and is an integer larger than n0.
Description
Technical field
The present invention relates to the communications field, particularly a kind of small region search method and terminal.
Background technology
Terminal will communicate, and first will start shooting.But, terminal is when just starting shooting, terminal is not attached on any community, that is, be now the information without any community in terminal, so terminal needs first to carry out Cell searching, realize Frequency Synchronization and the Timing Synchronization of terminal according to the cell information searched, and obtain community ID(Identity, identify label number).Cell searching is generally divided into two steps: frequency point scanning and cell detection.The function of frequency frequency sweep finds out the frequency that may there is community, by carrying out cell detection successively to these frequencies, realizes Frequency Synchronization and the time synchronized of terminal and community.
At LTE(Long Term Evolution, Long Term Evolution) in system, by PSS(PrimarySynchronization Signal, master sync signal) and SSS(Secondary synchronizationsignal, auxiliary synchronous signals) realize Cell searching, TD-LTE(Time Division Long TermEvolution, timesharing Long Term Evolution) in system PSS signal and SSS signal time-frequency location as shown in Figure 1.The timing of 10ms frame can be obtained by PSS signal, obtain nid(Network Identity, NID) 2; The timing of 5ms frame can be obtained by SSS signal, obtain nid1; Community ID(Identity can be obtained, identify label number) by the value of nid2 and nid1.
Small region search method of the prior art as shown in Figure 2, the method comprising the steps of 201, step 202 and step 203, these three steps are carry out full frequency band or the sequence of part frequency, PSS detection and SSS & CP(Cyclic Prefix, Cyclic Prefix successively) detect.Wherein step 201 is by full frequency band or part frequency spectrum scan, estimates each frequency power, according to each frequency power to whole frequency or the sequence of part frequency, finds out most possible N number of frequency; Step 202 carries out the detection of PSS relevant peaks by receiving data to a 5ms, obtains PSS timing and nid2, especially, under weak letter environment, because PSS relevant peaks is poor, so detect again after needing to merge the PSS relevant peaks of a 5ms, ensure the detection perform of PSS under weak letter environment; Step 203 carries out the detection of SSS relevant peaks by receiving data to b 5ms, obtains the timing of 5ms frame and nid1, same, because SSS relevant peaks is poor under weak letter environment, detects after also needing to merge the SSS relevant peaks of b 5ms again.Complete PSS detect and after SSS detection, just can realize Timing Synchronization and the Frequency Synchronization of terminal and base station according to the Search Results of community, and the detection of community ID, so far, Cell searching terminates.Then terminal enters the community resident stage, in this stage, terminal is according to the ID of institute detected cells and timing, again the PBCH(Physical Broadcast Channel of institute detected cells ID is received, Physical Broadcast Channel) carry out PBCH demodulation coding after channel data, read the MIB(Master InformationBlock in PBCH channel, Master Information Block) information, attempt resident.
In the small region search method of prior art, the value of a and b of setting is all larger.Because under the weak letter environment of reality, because the relevant peaks of PSS and SSS is poor, in order to ensure the performance of Cell searching under weak letter environment, need larger a and b.But, under strong letter environment, because the relevant peaks of PSS and SSS is all fine, a and b is set and equals 1 and namely PSS and SSS can be detected exactly.But prior art all uses the treatment technology under weak signal environment under weak signal environment and under strong letter environment, namely the value of a and b is all larger, the cell detection time under strong letter environment will be caused so long, and amount of calculation is large, and power consumption is large.Simultaneously in actual scene, weak letter scene is fewer, so directly adopt the detection scheme under weak letter to be irrational.
In addition, when frequency sorts, carry out sorting according to the power of each frequency, when downlink reception data power is greater than synchronizing signal power, and when there is uplink interference in TDD-LTE system, non-central frequency place power is much larger than center frequency point power, make correct frequency in frequency ranking results may come the last of frequency list, such terminal needs just correct frequency can be detected after much invalid frequency being detected, in addition, each invalid frequency is longer for detection time, considerably increases time and the power consumption of this scene Cell searching.
Summary of the invention
The object of the present invention is to provide a kind of small region search method and terminal, two kinds of situations are searched under small region search method can being divided into strong signal environment and under weak signal environment, under strong signal environment, merge the reception data of less number when Cell searching, terminal is completed as soon as possible and searches for and exit Cell searching flow process; Under weak signal environment, merge the reception data of more number when Cell searching, add and receive correlation peak in data and merge gain, improve Cell searching performance under weak letter environment, thus realize the function that Cell searching self adaptation exits.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of small region search method, comprise the following steps:
S1, from sequence after N number of frequency first frequency, receive the n of described frequency
0the laggard row cell detection of individual data, until Cell searching success or detected described N number of frequency, when detected described N number of frequency but Cell searching not yet success time, then perform S2; Wherein, described N be greater than 1 integer, described n
0for receiving the number of the data of described frequency under default strong signal environment, described n
0for being greater than the integer of 0, described strong signal environment refers to that signal to noise ratio is greater than the environment of default signal-noise ratio threshold;
S2, from first frequency of described N number of frequency, receive the n of described frequency
1the laggard row cell detection of individual data, until Cell searching success or detected described N number of frequency, when detected described N number of frequency but Cell searching not yet success time, judge Cell searching failure; Wherein, described n
1for receiving the number of the data of described frequency under default weak signal environment, described n
1for being greater than described n
0integer, described weak signal environment refers to that signal to noise ratio is less than or equal to the environment of described default signal-noise ratio threshold.
Embodiments of the present invention also provide a kind of terminal, comprise with lower module:
First detection module, for first frequency from the N number of frequency after sequence, receives the n of described frequency
0the laggard row cell detection of individual data, until Cell searching success or detected described N number of frequency, when detected described N number of frequency but Cell searching not yet success time, then forward the second detection module to; Wherein, described N be greater than 1 integer, described n
0for receiving the number of the data of described frequency under default strong signal environment, described n
0for being greater than the integer of 0, described strong signal environment refers to that signal to noise ratio is greater than the environment of default signal-noise ratio threshold;
Second detection module, for detected described N number of frequency at described first detection module but Cell searching not yet success time, from first frequency of described N number of frequency, receive the n of described frequency
1the laggard row cell detection of individual data, until Cell searching success or detected described N number of frequency, when detected described N number of frequency but Cell searching not yet success time, judge Cell searching failure; Wherein, described n
1for receiving the number of the data of described frequency under default weak signal environment, described n
1for being greater than described n
0integer, described weak signal environment refers to that signal to noise ratio is less than or equal to the environment of described default signal-noise ratio threshold.
Embodiment of the present invention in terms of existing technologies, two kinds of situations are searched under small region search method can being divided into strong signal environment and under weak signal environment, under strong signal environment, merge the data of less number when Cell searching, terminal is completed as soon as possible and searches for and exit Cell searching flow process; Under weak signal environment, merge the data of more number when Cell searching, to add in data correlation peak and merge gain, improve Cell searching performance under weak letter environment, thus realize the function that Cell searching self adaptation exits.
Preferably, after described Cell searching success, described method also comprises: the Master Information Block MIB reading community in the result of described cell detection.
As a further improvement on the present invention, terminal directly utilizes the data that in the result of cell detection, PSS detects and SSS detects to carry out MIB confirmation, instead of after obtaining the data that PSS detects and SSS detects, terminal receives the data of PBCH channel more again according to the data that the PSS received detects and SSS detects, and then carries out MIB confirmation.The present invention does not only increase the length receiving data, but also can prevent the generation of spurious cell in cell search process.
Preferably, described cell detection comprises: master sync signal PSS detection, auxiliary synchronous signals SSS and cyclic prefix CP detect.Described PSS detects and comprises: respectively by each the PSS data in a described T data and carry out related calculation according to the local PSS sequence of protocol generation, obtain T PSS correlation result, described T equals described n
0or described n
1; To the signal strength signal intensity instruction RSSI normalization that described T PSS correlation result does to receive, obtain T PSS normalization correlated results; Adjudicate after being merged by described T PSS normalization correlated results, obtain described PSS testing result, described PSS testing result comprises in described reception data PSS relevant peaks whether being detected.Before described S2, when described T equals described n
0time, extract the maximum normalization related power of PSS normalization correlated results maximum in described T normalization correlated results of each frequency as described each frequency, the described maximum normalization related power according to described each frequency is resequenced to described N number of frequency; In described S2, from first frequency in the described N number of frequency after described rearrangement, receive the n of described frequency
1individual data laggard row cell detection is until Cell searching success or detected described N number of frequency.Described SSS detects and CP detection comprises: the result detected according to described PSS, intercept the SSS data in described reception data, by described T SSS data with carry out related calculation according to the local SSS sequence of protocol generation, obtain T SSS correlation result, described T equals described n
0or described n
1; RSSI normalization is done to described T SSS correlation result, obtains T SSS normalization correlated results; Adjudicate after being merged by described T normalization correlated results, obtain the testing result that described SSS and CP detects, the testing result that described SSS and CP detects comprises in described reception data SSS relevant peaks whether being detected.
As a further improvement on the present invention, the maximum PSS normalization correlated results of each frequency obtained according to cell detection is resequenced to N number of frequency, and then carry out Cell searching according to the N number of frequency after rearrangement, can come after N number of frequency queue by noisy for tool frequency, when decreasing high-power, under downlink data or uplink interference scene, frequency sorts insecure Cell searching used time.
Accompanying drawing explanation
Fig. 1 is the structural representation of the synchronizing signal in prior art in TD-LTE system;
Fig. 2 is prior art small area searching method schematic flow sheet;
Fig. 3 is the small region search method schematic flow sheet that first embodiment of the invention provides;
Fig. 4 is the method flow schematic diagram that in first embodiment of the invention, PSS detects;
Fig. 5 is the method flow schematic diagram that in first embodiment of the invention, SSS detects;
Fig. 6 is the small region search method schematic flow sheet that second embodiment of the invention provides;
Fig. 7 is the small region search method schematic flow sheet that third embodiment of the invention provides;
Fig. 8 is the small region search method schematic flow sheet that four embodiment of the invention provides.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the embodiments of the present invention are explained in detail.But, persons of ordinary skill in the art may appreciate that in each execution mode of the present invention, proposing many ins and outs to make reader understand the application better.But, even without these ins and outs with based on the many variations of following execution mode and amendment, each claim of the application technical scheme required for protection also can be realized.
First embodiment of the invention provides a kind of small region search method, in the method, first suppose that terminal is in strong signal environment, the small region search method under strong signal environment is utilized to carry out Cell searching, when terminal cannot search community, just think that terminal is in weak signal environment, the small region search method under recycling weak signal environment carries out Cell searching.Strong signal environment refers to that signal to noise ratio is greater than the environment of default signal-noise ratio threshold, and weak signal environment refers to that signal to noise ratio is less than or equal to the environment of default signal-noise ratio threshold.Signal-noise ratio threshold is an adjustable threshold value of artificial setting, example, and default signal-noise ratio threshold can be 10dB(Decibel, decibel), therefore, can be strong signal environment by the Environment Definition being greater than 10dB, be weak signal environment by the Environment Definition being less than or equal to 10dB.
Particularly, as shown in Figure 3, the method comprises the following steps:
301, carry out spectrum scan to full frequency band or part frequency, estimate the power of each frequency, sort according to each frequency power to whole frequency or part frequency, finding out power is N number of frequency that front N is strong.
N be greater than 1 integer.It should be noted that, carrying out scanning or carrying out spectrum scan to part frequency to the frequency spectrum of full frequency band is that terminal is selected according to scene.The embodiment of step 301 is prior art, and the present invention does not repeat at this.
302, from first frequency of the N number of frequency after sequence, the n of frequency is received
0the laggard row cell detection of individual data.N
0for receiving the number of the data of frequency under default strong signal environment, n
0for being greater than the integer of 0.
Receive data and comprise PSS data, SSS data and CP data.
Under strong letter environment, the relevant peaks of PSS and SSS is all fine, and therefore, can arrange the number receiving data is less value n
0, just PSS relevant peaks and SSS relevant peaks can be detected exactly by less reception data.Example, n
0can be 1.
Usually, receive data be 5ms(millisecond) subframe.
Cell detection comprises: PSS detects, SSS and CP detects.
Further, as shown in Figure 4, PSS detects and comprises following sub-step:
Sub-step 3021, respectively by n
0each PSS data in individual reception data with carry out related calculation according to the local PSS sequence of protocol generation, obtain n
0individual PSS correlation result.
Related operation is a kind of mathematical operation of the prior art, and the present invention does not repeat at this.
Sub-step 3022, to n
0individual PSS correlation result does RSSI normalization, obtains n
0individual PSS normalization correlated results.
Be normalized to a kind of Mathematical treatment means of the prior art, the present invention does not repeat at this.
Sub-step 3023, by n
0individual PSS normalization correlated results is adjudicated after merging, and obtains PSS testing result, and PSS testing result comprises receiving in data PSS relevant peaks whether detected.
It should be noted that, when detecting that the subframe of 5ms comprises PSS relevant peaks in PSS testing result, then carrying out SSS and CP and detecting.In addition, in this PSS testing result except PSS relevant peaks, also should comprise the particular location of this PSS relevant peaks in this 5ms subframe, due in 5ms subframe, the position relationship of PSS and SSS is fixing, but different CP type position relationship is different, therefore, the position of SSS can be determined according to the position at PSS relevant peaks place, so that intercept SSS data according to the position of the SSS determined, then carry out SSS and CP according to SSS data and detect.
Further, as shown in Figure 5, SSS and CP detects and comprises following sub-step:
Sub-step 3024, the result detected according to PSS, intercept the SSS data received in data, by n
0individual SSS data with carry out related calculation according to the local SSS sequence of protocol generation, obtain n
0individual SSS correlation result.
Sub-step 3025, to n
0individual SSS correlation result does RSSI normalization, obtains n
0individual SSS normalization correlated results.
Sub-step 3026, by n
0individual normalization correlated results is adjudicated after merging, and obtains the testing result that SSS and CP detects, and the testing result that SSS and CP detects comprises receiving in data SSS relevant peaks whether detected.
It should be noted that, the procedure that SSS with CP detects is the same with the procedure that PSS detects substantially, unique difference is, detect the result obtained different, it is receive in data whether have SSS relevant peaks to detect that SSS and CP detects, and PSS detection is to detect in 5ms sub-frame data whether have PSS relevant peaks.All carry Frequency Synchronization message and time synchronized message in PSS relevant peaks and SSS relevant peaks, terminal is carried out synchronous according to this Frequency Synchronization message and time synchronized message with the community in network.
Step 302 leaves it at that.
303, judge that whether Cell searching is successful.
When PSS relevant peaks and SSS relevant peaks being detected in the subframe at 5ms in the cell detection process of step 302 simultaneously, judge Cell searching success, terminate Cell searching flow process, otherwise, perform step 304.
304, judge whether N number of frequency has all detected.
When Cell searching is unsuccessful and N number of frequency has not all been detected, returns step 302 and proceed cell detection; When having detected N number of frequency but Cell searching is not yet successful, then step 305 is performed, namely after N number of frequency all being carried out to PSS detection, SSS and CP detection, when not detecting PSS relevant peaks and SSS relevant peaks, under thinking that this terminal is in weak signal environment, the small region search method under weak environment is then adopted to carry out Cell searching.
305, from first frequency of the N number of frequency after sequence, the n of frequency is received
1cell detection is carried out after individual PSS data.N
1for receiving the number of the data of frequency under default weak signal environment, n
1for being greater than n
0integer.
The execution mode of this step is identical with step 302, and specifically see the associated description of step 302, therefore not to repeat here in the present invention.
It should be noted that, this step is the small region search method under weak signal environment, due under weak signal environment, PSS relevant peaks and SSS relevant peaks poor, therefore, in order to ensure the performance of Cell searching, the number of the PSS data of each frequency of reception of setting is greater than the number of the data of each frequency of the reception arranged in step 302.
306, judge that whether Cell searching is successful.
This step is identical with step 303, when PSS relevant peaks and SSS relevant peaks being detected in the subframe namely at 5ms in the cell detection process of step 305 simultaneously, judges Cell searching success, terminates Cell searching flow process, otherwise, perform step 307.
307, judge whether N number of frequency has all detected.
This step and step 304 are substantially identical, but slightly distinguish, and specific explanations is as follows:
When Cell searching is unsuccessful and N number of frequency has not all been detected, returns step 305 and proceed cell detection; When having detected N number of frequency but Cell searching is not yet successful, judging Cell searching failure, namely after N number of frequency all being carried out to PSS detection, SSS and CP detection, when not detecting PSS relevant peaks and SSS relevant peaks, having performed step 308.
308, Cell searching failure is judged.
After the failure of judgement Cell searching, terminate Cell searching flow process.
Embodiment of the present invention in terms of existing technologies, two kinds of situations are searched under small region search method can being divided into strong signal environment and under weak signal environment, under strong signal environment, merge the reception data of less number when Cell searching, terminal is completed as soon as possible and searches for and exit Cell searching flow process; Under weak signal environment, merge the reception data of more number when Cell searching, add correlation peak and merge gain, improve Cell searching performance under weak letter environment, thus realize the function that Cell searching self adaptation exits.
Second execution mode of the present invention relates to a kind of small region search method.Second execution mode has done further improvement on the first execution mode basis, and main improvements are: in second embodiment of the invention, and after Cell searching success, the method also comprises: the MIB reading community in the result of cell detection.As a further improvement on the present invention, terminal directly utilizes the data that in the result of cell detection, PSS detects and SSS detects to carry out MIB confirmation, instead of after obtaining the data that PSS detects and SSS detects, terminal receives the data of PBCH channel more again according to the data that the PSS received detects and SSS detects, and then carries out MIB confirmation.The present invention does not only increase and receives the length of data, but also can prevent the generation of spurious cell in cell search process, and spurious cell refers to and do not detect in real network and this community that terminal detects.
As shown in Figure 6, present embodiment specifically comprises step 601 to step 610, and wherein, step 601 is identical to step 308 with the step 301 in the first execution mode to step 608, compared with the first execution mode, newly-increased step 609 and the specific implementation method of step 610 and be described below:
The MIB of step 609, reading community.
After PSS relevant peaks and SSS relevant peaks being detected by step 601 to step 608, namely after acquisition frame synchronization information, first step 609 reads PBCH (PhysicalBroadcast Channel from frame synchronization information, Physical Broadcast Channel) message, and then MIB is read from PBCH message.
Step 610, judge whether the MIB of community successfully reads.
If the MIB of community reads successfully, then terminate cell search process; If the unsuccessful reading of the MIB of community, then directly terminate cell search process.
Terminal directly utilizes the data that in the result of cell detection, PSS detects and SSS detects to carry out MIB confirmation, instead of after obtaining the data that PSS detects and SSS detects, the data that terminal detects according to the PSS that receives again and the data of SSS detection receive PBCH channel again carry out the confirmation of MIB, can prevent the generation of spurious cell.
Be not difficult to find, present embodiment is the system embodiment corresponding with the first execution mode, and present embodiment can be worked in coordination with the first execution mode and be implemented.The relevant technical details mentioned in first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first execution mode.
3rd execution mode of the present invention relates to a kind of small region search method.3rd execution mode has done further improvement on the second execution mode basis, main improvements are: in second embodiment of the invention, small region search method under utilizing strong signal environment has searched for N number of frequency, but when Cell searching is unsuccessful, N number of frequency is resequenced, the maximum PSS normalization related power being specially each frequency obtained according to cell detection is resequenced to N number of frequency, can noisy for tool frequency be come after N number of frequency queue like this, when decreasing high-power, under downlink data or uplink interference scene, frequency sorts insecure Cell searching used time.
As shown in Figure 7, present embodiment specifically comprises step 701 to step 711, wherein, step 701 is corresponding identical with the step 601 in the second execution mode and step 604 respectively to step 704, step 706 is corresponding identical to step 610 with the step 605 in the second execution mode respectively to step 711, step newly-increased in present embodiment is step 705, the specific implementation method of newly-increased step 705 and being described below:
Step 705, before step 706, extract the n of each frequency
0pSS normalization correlated results maximum in individual normalization correlated results is as the maximum normalization related power of each frequency, and the maximum normalization related power according to each frequency is resequenced to N number of frequency.
It should be noted that, after to N number of frequency rearrangement, use the small region search method under weak signal environment, in step 706, from first frequency in the N number of frequency after rearrangement, receive the n of frequency
1cell detection is carried out until Cell searching success or detected N number of frequency after individual PSS data.
Can come after N number of frequency queue by noisy for tool frequency like this, when decreasing high-power, under downlink data or uplink interference scene, frequency sorts insecure Cell searching used time.
Be not difficult to find, present embodiment is the system embodiment corresponding with the second execution mode, and present embodiment can be worked in coordination with the second execution mode and be implemented.The relevant technical details mentioned in second execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first execution mode.
4th execution mode of the present invention relates to a kind of small region search method.4th execution mode is substantially identical at the first execution mode, as shown in Figure 8, present embodiment comprises step 801 to step 808, wherein 802 and step 805 different from the step 302 in the first execution mode and step 305 respectively, present embodiment and the first execution mode difference are: in present embodiment, the cell detecting method that step 802 and step 805 use can for carrying out the method for cell detection in prior art, step 802 and step 805 specific implementation method and be described below:
Step 802, reception n
2individual data directly carry out the detection of PSS relevant peaks, receive n
3individual data directly carry out the detection of SSS relevant peaks.
Step 302 in this step and the first execution mode comparatively speaking, does not need to carry out related operation and normalized, but directly utilizes the data received to detect.
Step 805, to the n received in data
2individual PSS data carry out the detection of PSS relevant peaks after merging; To the n received in data
3individual SSS data carry out the detection of SSS relevant peaks after merging.
Wherein, n
2and n
3be and compare n
0large integer.
Due to PSS relevant peaks under weak signal environment and SSS relevant peaks poor, so need respectively to n
2the reception data of individual 5ms and n
3the SSS data of individual 5ms merge, and ensure the detection perform of PSS and SSS under weak letter environment.
Fifth embodiment of the invention relates to a kind of terminal, comprises with lower module:
First detection module, for first frequency from the N number of frequency after sequence, receives the n of frequency
0the laggard row cell detection of individual data, until Cell searching success or detected N number of frequency, when detected N number of frequency but Cell searching not yet success time, then forward the second detection module to; Wherein, N be greater than 1 integer, n
0for receiving the number of the data of frequency under default strong signal environment, n
0for being greater than the integer of 0, strong signal environment refers to that signal to noise ratio is greater than the environment of default signal-noise ratio threshold.
Second detection module, for detected described N number of frequency at described first detection module but Cell searching not yet success time, from first frequency of N number of frequency, receive the n of frequency
1the laggard row cell detection of individual data, until Cell searching success or detected N number of frequency, when detected N number of frequency but Cell searching not yet success time, judge Cell searching failure; Wherein, n
1for receiving the number of the data of frequency under default weak signal environment, n
1for being greater than n
0integer, weak signal environment refers to that signal to noise ratio is less than or equal to the environment of default signal-noise ratio threshold.
First detection module and the second detection module include:
PSS detection sub-module, auxiliary synchronous signals SSS and cyclic prefix CP detection sub-module.
PSS detection sub-module comprises following subelement:
Related operation subelement, for respectively T being received each the PSS data in data and carry out related calculation according to the local PSS sequence of protocol generation, obtain T PSS correlation result, T equals n
0or n
1.
Normalization subelement, for doing RSSI normalization to T PSS correlation result, obtains T PSS normalization correlated results.
Judgement subelement, adjudicates, obtains PSS testing result after being merged by T PSS normalization correlated results, and PSS testing result comprises receiving in data PSS relevant peaks whether detected.
SSS and CP detection sub-module comprises following subelement:
Related operation subelement, for the result detected according to PSS, intercepts the SSS data received in data, and by T SSS data and carry out related calculation according to the local SSS sequence of protocol generation, obtain T SSS correlation result, T equals n
0or n
1.
Normalization subelement, for doing RSSI normalization to T SSS correlation result, obtains T SSS normalization correlated results.
Judgement subelement, adjudicates after being merged by T normalization correlated results, obtains the testing result that SSS and CP detects, and the testing result that SSS and CP detects comprises receiving in data SSS relevant peaks whether detected.
Embodiment of the present invention in terms of existing technologies, terminal comprises first detection module and the second detection module, first detection module can be used in the Cell searching under strong signal environment, second detection module can be used in the Cell searching under weak signal environment, in first detection module, merge the reception data of less number when Cell searching, terminal is completed as soon as possible and searches for and exit Cell searching flow process; In the second detection module, merge the reception data of more number when Cell searching, add and receive correlation peak in data and merge gain, improve Cell searching performance under weak letter environment, thus realize the function that Cell searching self adaptation exits.
Sixth embodiment of the invention relates to a kind of terminal, 6th execution mode has done further improvement on the 5th execution mode basis, main improvements are: this terminal adds and reads MIB module, this reading MIB module is used for for when first detection module or the second detection module are successfully searched community, reads the MIB of community in the result of the cell detection of first detection module or the second detection module.
As a further improvement on the present invention, the reading MIB module of terminal directly utilizes the data that in the result of cell detection, PSS detects and SSS detects to carry out MIB confirmation, instead of after obtaining the data that PSS detects and SSS detects, terminal receives the data of PBCH channel more again according to the data that the PSS received detects and SSS detects, and then carries out MIB confirmation.The present invention does not only increase the length receiving data, but also can prevent the generation of spurious cell in cell search process.
Seventh embodiment of the invention relates to a kind of terminal, and the 7th execution mode has done further improvement on the 6th execution mode basis, and main improvements are: this terminal turn increases with lower module:
Rearrangement module, for extracting the maximum normalization related power of PSS normalization correlated results maximum in T normalization correlated results of each frequency as each frequency, maximum normalization related power according to each frequency is resequenced to N number of frequency, and T equals n
0.
After rearrangement module is resequenced, the second detection module, from first frequency in the N number of frequency after rearrangement, receives the n of frequency
1individual data laggard row cell detection is until Cell searching success or detected N number of frequency.
As a further improvement on the present invention, the maximum PSS normalization correlated results of each frequency that rearrangement module obtains according to cell detection is resequenced to N number of frequency, can come after N number of frequency queue by noisy for tool frequency, when decreasing high-power, under downlink data or uplink interference scene, frequency sorts insecure Cell searching used time.
Eighth embodiment of the invention relates to a kind of terminal, and the terminal that this terminal and the 5th execution mode relate to is similar, and this terminal comprises first detection module and the second detection module, unlike, this first detection module is used for the n to receiving
2individual PSS data directly carry out the detection of PSS relevant peaks; To the n received
3individual SSS data directly carry out the detection of SSS relevant peaks.
The first detection module that first detection module and the 5th execution mode provide comparatively speaking, the first detection module of this terminal does not need to carry out related operation and normalized when carrying out PSS detection and SSS detects, but directly utilizes the data received to detect.
This second detection module is used for the n to receiving
2individual PSS data carry out the detection of PSS relevant peaks after merging; To the n received
3individual SSS data carry out the detection of SSS relevant peaks after merging.
Due to PSS relevant peaks under weak signal environment and SSS relevant peaks poor, so need respectively to n
2the PSS data of individual 5ms and n
3the SSS data of individual 5ms merge, and ensure the detection perform of PSS and SSS under weak letter environment.
It is worth mentioning that, be logic module about each module involved in the execution mode of device, in actual applications, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical location.The operation principle of each physical location can describing in reference method embodiment, and the present invention does not repeat them here.In addition, in order to outstanding innovative part of the present invention, the unit not too close with solving technical problem relation proposed by the invention is not introduced in present embodiment, but this does not show the unit that there is not other in present embodiment.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above realize specific embodiments of the invention, and in actual applications, various change can be done to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (12)
1. a small region search method, is characterized in that, comprises the following steps:
S1, from sequence after N number of frequency first frequency, receive the n of described frequency
0the laggard row cell detection of individual data, until Cell searching success or detected described N number of frequency, when detected described N number of frequency but Cell searching not yet success time, then perform S2; Wherein, described N be greater than 1 integer, described n
0for receiving the number of the data of described frequency under default strong signal environment, described n
0for being greater than the integer of 0, described strong signal environment refers to that signal to noise ratio is greater than the environment of default signal-noise ratio threshold;
S2, from first frequency of described N number of frequency, receive the n of described frequency
1the laggard row cell detection of individual data, until Cell searching success or detected described N number of frequency, when detected described N number of frequency but Cell searching not yet success time, judge Cell searching failure; Wherein, described n
1for receiving the number of the data of described frequency under default weak signal environment, described n
1for being greater than described n
0integer, described weak signal environment refers to that signal to noise ratio is less than or equal to the environment of described default signal-noise ratio threshold.
2. small region search method according to claim 1, is characterized in that, after described Cell searching success, described method also comprises:
The Master Information Block MIB of community is read in the result of described cell detection.
3. small region search method according to claim 1, is characterized in that, described cell detection comprises:
Master sync signal PSS detection, auxiliary synchronous signals SSS and cyclic prefix CP detect.
4. small region search method according to claim 3, is characterized in that, described PSS detects and comprises:
Respectively by each the PSS data in T described reception data with carry out related calculation according to the local PSS sequence of protocol generation, obtain T PSS correlation result, described T equals described n
0or described n
1;
To the signal strength signal intensity instruction RSSI normalization that described T PSS correlation result does to receive, obtain T PSS normalization correlated results;
Adjudicate after being merged by described T PSS normalization correlated results, obtain described PSS testing result, described PSS testing result comprises in described reception data PSS relevant peaks whether being detected.
5. small region search method according to claim 4, is characterized in that, before described S2, when described T equals described n
0time, extract the maximum normalization related power of PSS normalization correlated results maximum in described T normalization correlated results of each frequency as described each frequency, the described maximum normalization related power according to described each frequency is resequenced to described N number of frequency;
In described S2, from first frequency in the described N number of frequency after described rearrangement, receive the n of described frequency
1individual data laggard row cell detection is until Cell searching success or detected described N number of frequency.
6. small region search method according to claim 3, is characterized in that, described SSS detects and CP detection comprises:
According to the result that described PSS detects, intercept the SSS data in described reception data, by described T SSS data with carry out related calculation according to the local SSS sequence of protocol generation, obtain T SSS correlation result, described T equals described n
0or described n
1;
RSSI normalization is done to described T SSS correlation result, obtains T SSS normalization correlated results;
Adjudicate after being merged by described T normalization correlated results, obtain the testing result that described SSS and CP detects, the testing result that described SSS and CP detects comprises in described reception data SSS relevant peaks whether being detected.
7. a terminal, is characterized in that, comprises with lower module:
First detection module, for first frequency from the N number of frequency after sequence, receives the n of described frequency
0the laggard row cell detection of individual data, until Cell searching success or detected described N number of frequency; Wherein, described N be greater than 1 integer, described n
0for receiving the number of the data of described frequency under default strong signal environment, described n
0for being greater than the integer of 0, described strong signal environment refers to that signal to noise ratio is greater than the environment of default signal-noise ratio threshold;
Second detection module, for detected described N number of frequency at described first detection module but Cell searching not yet success time, from first frequency of described N number of frequency, receive the n of described frequency
1the laggard row cell detection of individual data, until Cell searching success or detected described N number of frequency, when detected described N number of frequency but Cell searching not yet success time, judge Cell searching failure; Wherein, described n
1for receiving the number of the data of described frequency under default weak signal environment, described n
1for being greater than described n
0integer, described weak signal environment refers to that signal to noise ratio is less than or equal to the environment of described default signal-noise ratio threshold.
8. terminal according to claim 7, is characterized in that, described terminal also comprises:
Read Master Information Block MIB module, for when described first detection module or described second detection module are successfully searched community, in the result of the cell detection of described first detection module or described second detection module, read the MIB of community.
9. terminal according to claim 7, is characterized in that, described first detection module and described second detection module include:
PSS detection sub-module, auxiliary synchronous signals SSS and cyclic prefix CP detection sub-module.
10. terminal according to claim 9, is characterized in that, described PSS detection sub-module comprises following subelement:
Related operation subelement, for respectively by each the PSS data in T described reception data with carry out related calculation according to the local PSS sequence of protocol generation, obtain T PSS correlation result, described T equals described n
0or described n
1;
Normalization subelement, for doing RSSI normalization to described T PSS correlation result, obtains T PSS normalization correlated results;
Judgement subelement, adjudicate after being merged by described T PSS normalization correlated results, obtain described PSS testing result, described PSS testing result comprises in described reception data PSS relevant peaks whether being detected.
11. terminals according to claim 10, is characterized in that, described terminal also comprises:
Rearrangement module, for extracting the maximum normalization related power of PSS normalization correlated results maximum in described T normalization correlated results of each frequency as described each frequency, described maximum normalization related power according to described each frequency is resequenced to described N number of frequency, and described T equals described n
0;
Described second detection module, from first frequency in the described N number of frequency after described rearrangement, receives the n of described frequency
1individual data laggard row cell detection is until Cell searching success or detected described N number of frequency.
12. terminals according to claim 9, is characterized in that, described SSS and CP detection sub-module comprises following subelement:
Related operation subelement, for the result detected according to described PSS, intercept the SSS data in described reception data, by described T SSS data with carry out related calculation according to the local SSS sequence of protocol generation, obtain T SSS correlation result, described T equals described n
0or described n
1;
Normalization subelement, for doing RSSI normalization to described T SSS correlation result, obtains T SSS normalization correlated results;
Judgement subelement, adjudicates after being merged by described T normalization correlated results, obtains the testing result that described SSS and CP detects, and the testing result that described SSS and CP detects comprises in described reception data SSS relevant peaks whether being detected.
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