CN102572970A - Method and device for searching cell in homogeneous-frequency neighboring cells - Google Patents
Method and device for searching cell in homogeneous-frequency neighboring cells Download PDFInfo
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- CN102572970A CN102572970A CN201110432259XA CN201110432259A CN102572970A CN 102572970 A CN102572970 A CN 102572970A CN 201110432259X A CN201110432259X A CN 201110432259XA CN 201110432259 A CN201110432259 A CN 201110432259A CN 102572970 A CN102572970 A CN 102572970A
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Abstract
The invention provides a method and a device for searching a cell in homogeneous-frequency neighboring cells. The method comprises the following steps of: performing primary synchronization signal (PSS) detection and secondary synchronization signal (SSS) detection on total receipt signals, eliminating signals corresponding to a cell to be eliminated in the total receipt signals according to PSS detection and SSS detection results, acquiring the total receipt signals subjected to interference elimination, then performing PSS detection on the total receipt signals and performing SSS detection on the total receipt signals subjected to interference elimination, or performing PSS detection and SSS detection on the receipt signals subjected to interference elimination. By adopting the method and the device for searching the cell in the homogeneous-frequency neighboring cells, the search accuracy of the homogeneous-frequency neighboring cells can be improved.
Description
Technical field
The embodiment of the invention relates to the communication technology, relates in particular to a kind of method and apparatus of in homogeneous-frequency adjacent-domain, carrying out Cell searching.
Background technology
In Long Term Evolution (Long Term Evolution is called for short LTE) system, behind the mobile terminal-opening, at first start initial ranging, the search service sub-district is so that resident.Resident behind certain Serving cell in the portable terminal success, then can start the adjacent area search.The main purpose of adjacent area search is search homogeneous-frequency adjacent-domain or alien frequencies adjacent area, for operations such as gravity treatment or switching are prepared.
In search procedure, between Serving cell and the homogeneous-frequency adjacent-domain, and between each homogeneous-frequency adjacent-domain of Serving cell, generally all can there be the power difference to homogeneous-frequency adjacent-domain.For the more weak sub-district of power, the co-frequency cell that power is stronger is a kind of interference.The existence of interfered cell can reduce the probability that the more weak sub-district of power is searched.Operating frequency two sub-districts is identical; And one of them cell power is better than under the situation of another cell power; Adopt the existing method of in homogeneous-frequency adjacent-domain, carrying out Cell searching, can only search the strong sub-district of power, and can't search the sub-district a little less than the power; Therefore, the accuracy to the homogeneous-frequency adjacent-domain search is low.
Summary of the invention
The embodiment of the invention provides a kind of method and apparatus of in homogeneous-frequency adjacent-domain, carrying out Cell searching, in order to improve the accuracy of homogeneous-frequency adjacent-domain search.
The embodiment of the invention provides a kind of method of in homogeneous-frequency adjacent-domain, carrying out Cell searching, comprising:
Total reception signal is carried out master sync signal PSS detection and auxiliary synchronous signals SSS detection, obtain the result that PSS detects and SSS detects;
Detect the result who detects with SSS according to said PSS, eliminate the signal that treating in said total reception signal eliminated the sub-district correspondence, obtain the total reception signal after the interference eliminated;
Total reception signal is carried out the PSS detection and the total reception signal after the interference eliminated is carried out the SSS detection, perhaps, the total reception signal after the interference eliminated is carried out PSS detection and SSS detection.
The embodiment of the invention also provides a kind of device of in homogeneous-frequency adjacent-domain, carrying out Cell searching, comprising:
The PSS detecting unit; Being used for that total reception signal is carried out PSS detects; Obtain PSS testing result to total reception signal; Be used for that perhaps the total reception signal after total reception signal and the interference eliminated is carried out PSS and detect, obtain PSS testing result the total reception signal after total reception signal and the interference eliminated;
The SSS detecting unit is used for that the total reception signal after total reception signal and the interference eliminated is carried out SSS and detects, and obtains the SSS testing result to the total reception signal after total reception signal and the interference eliminated;
Interference cancellation unit is used for according to said PSS detecting unit and the said SSS detecting unit testing result to total reception signal, eliminates treating in said total reception signal and eliminates the corresponding signal in sub-district, obtains the total reception signal after the interference eliminated.
Can know by technique scheme; The embodiment of the invention at first total reception signal is carried out the PSS detection and SSS detects, and obtains the preliminary Search Results of sub-district, eliminates the interfered cell in the preliminary Search Results through the step of interference eliminated then; After accomplishing interference eliminated, carrying out PSS detection and SSS once more detects; Therefore, when carrying out above-mentioned detection once more, the interference of sub-district without interruption; Thereby search with interfered cell and be weaker than the sub-district of interfered cell, so improved the accuracy of homogeneous-frequency adjacent-domain search with frequency and power.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply; Obviously, the accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a FDD frame structure sketch map in the LTE system;
Fig. 2 is a tdd frame structural representation in the LTE system;
Fig. 3 is the flow chart of the method for Cell searching of in homogeneous-frequency adjacent-domain, carrying out of the embodiment of the invention one;
Fig. 4 is the flow chart of step 302 in the method for in homogeneous-frequency adjacent-domain, carrying out Cell searching of the embodiment of the invention one;
Fig. 5 is the structural representation of in homogeneous-frequency adjacent-domain, carrying out the device of Cell searching of the embodiment of the invention two;
Fig. 6 is the structural representation of in homogeneous-frequency adjacent-domain, carrying out the device of Cell searching of the embodiment of the invention three;
Fig. 7 is the structural representation of interference cancellation unit among the embodiment of the invention two and the embodiment three.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
At present, in third generation partner program (The 3rd Generation Partnership Project is called for short 3GPP) LTE system; Physical layer has 504 cell ID (Identity; Be called for short ID), be divided into 168 different groups, 3 every group different sub-district ID.The sub-district ID of expression physical layer with
; The expression group number with
, scope is 0 to 167; With numbering in
expression group, scope is 0 to 2.Each cell ID
corresponds to only one group number
, and only one group number
Particularly, the LTE system utilizes master sync signal (Primary Synchronization Signal is called for short PSS) and auxiliary synchronous signals (Secondary Synchronization Signal is called for short SSS) to accomplish Cell searching.Every PSS of 5ms transmission and SSS signal.Fig. 1 is a FDD frame structure sketch map in the LTE system.Fig. 2 is a tdd frame structural representation in the LTE system.Referring to Fig. 1 and Fig. 2, the SSS signal sends in the 0th, 5 subframes.When adopting the FDD frame structure, the PSS signal sends in the 0th, 5 subframes; When adopting the tdd frame structure, the PSS signal sends in the 1st, 6 subframes.The PSS signal repetition period is 5ms; The SSS signal repetition period is 1 frame (10ms), and the SSS signal of front and back field (5ms) is different.The PSS frequency-region signal is unique by
confirms totally 3.The SSS frequency-region signal by
and the field position at SSS signal place (field or back field before for example being positioned at) confirm; For the field position at fixing
and SSS signal place, totally 168 of SSS signals.PSS signal and SSS signal all are symmetrically distributed on frequency domain about direct current (Direct Current is called for short DC) subcarrier, account for 62 number of sub-carrier separately.The PSS signal is on time domain in different OFDM (Orthogonal Frequency Division Multiplexing the is called for short OFDM) symbol with the SSS signal, and the SSS signal is in the front of PSS signal.When adopting the FDD frame structure, the OFDM symbol at the OFDM symbol at SSS signal place and PSS signal place is adjacent; When adopting the tdd frame structure, 2 OFDM symbols of OFDM mark space at the OFDM symbol at SSS signal place and PSS signal place.The concrete generative process of PSS signal and SSS signal is carried out according to the regulation of 3GPP TS 36.211 agreements.
The method of in homogeneous-frequency adjacent-domain, carrying out Cell searching generally includes PSS and detects step and SSS detection step.At first carry out PSS and detect step: utilize time domain always to receive signal and local PSS input goes out PSS sign synchronization position; Can detect simultaneously each PSS sign synchronization position corresponding
then; PSS is detected PSS sign synchronization position that step obtains and corresponding
thereof always to be received signal with time domain and offers SSS detection step; Detect in the step at SSS: always receive from time domain based on detected each the PSS sign synchronization position of PSS detection step and extract synchronizing signal the signal; Synchronizing signal is carried out SSS to be detected; Obtain sub-district ID, frame synchronization position, Cyclic Prefix (Cyclic Prefix is called for short CP) type etc.Subscriber equipment (User Equipment is called for short UE) can be confirmed the sub-district according to PSS detection and SSS testing result after PSS detection that detects a sub-district and SSS testing result.
The embodiment of the invention proposes on the basis of the above-mentioned existing method of in homogeneous-frequency adjacent-domain, carrying out Cell searching, to improve, and in the search procedure of homogeneous-frequency adjacent-domain, adds the step of eliminating interfered cell.Below through specific embodiment, the method and apparatus of in homogeneous-frequency adjacent-domain, carrying out Cell searching that the present invention is proposed describes in detail.In following each embodiment of the present invention; Preset time domain PSS local signal is the local signal that is provided with in advance according to the regulation in the preset communication protocol with preset time domain SSS local signal; Preferably, this preset communication protocol can adopt 3GPP TS 36.211 agreements, according to the regulation of existing protocol; Generate time domain PSS local signal and time domain SSS local signal, and above-mentioned two signals that will generate are arranged on the device this locality of in homogeneous-frequency adjacent-domain, carrying out Cell searching in advance.
Fig. 3 is the flow chart of the method for Cell searching of in homogeneous-frequency adjacent-domain, carrying out of the embodiment of the invention one.As shown in Figure 3, this method comprises following process.
Step 301: total reception signal is carried out PSS detection and SSS detection.
In this step, total reception signal is carried out master sync signal PSS detection and auxiliary synchronous signals SSS detection, obtain the result that PSS detects and SSS detects.It is identical with prior art that PSS detects the concrete grammar that detects with SSS, carries out PSS detection step and the SSS detection signal that step adopted and be total signal that receives.The detailed process of step 301 comprises: the first step; According to preset time domain PSS local signal; Detect total signal that receives; Obtain at least one PSS sign synchronization position and first group of corresponding interior numbering, the result that PSS detects comprises above-mentioned at least one PSS sign synchronization position and first group of interior numbering.Second step; From total reception signal, extract synchronizing signal according to each PSS sign synchronization position; Synchronizing signal is carried out SSS to be detected; Obtain sub-district ID, frame synchronization position and the CP type of each detected first sub-district, the result that SSS detects comprises cell ID ID, frame synchronization position and the CP type of above-mentioned each detected first sub-district.
Step 302: detect the result who detects with SSS according to above-mentioned PSS, eliminate total signal that treating in the signal eliminated the sub-district correspondence that receives, obtain the total reception signal after the interference eliminated.
In this step, sub-district to be eliminated be the indication of sub-district intensity strong, can be to causing the interfered cell of interference with the more small and weak district of intensity indication, sub-district frequently with it.Particularly; In each embodiment of the present invention; Sub-district intensity indication can be estimated according to multiple parameter; For example: estimate the intensity indication of sub-district according to the Signal to Interference plus Noise Ratio (Signal to Interference plus Noise Ratio is called for short SINR) of sub-district or according to the Reference Signal Received Power parameters such as (Reference Signal Received Power are called for short RSRP) of sub-district.
Step 303: total reception signal is carried out the PSS detection and the total reception signal after the interference eliminated is carried out the SSS detection, perhaps, the total reception signal after the interference eliminated is carried out PSS detection and SSS detection.
In this step, after the step of the interference eliminated of having carried out step 302, carry out PSS detection and SSS again and detect.It is identical with prior art that PSS detects the concrete grammar that detects with SSS.For the weak jamming situation, carrying out the SSS detection signal that step adopted is the total reception signal after the interference eliminated, carries out the PSS detection signal that step adopted and can still be total signal that receives.The detailed process of step 303 comprises under the weak jamming situation: at first, the time domain PSS local signal according to preset detects said total reception signal, obtains at least one PSS sign synchronization position and first group of corresponding interior numbering.Then,, above-mentioned synchronizing signal is carried out SSS detect, obtain sub-district ID, frame synchronization position and the CP type of each detected second sub-district according to extracting synchronizing signal each a PSS sign synchronization position total reception signal after interference eliminated.For the strong jamming situation, carry out the total reception signal after PSS detection step and the SSS detection signal that step adopted are interference eliminated.The detailed process of step 303 comprises under the strong jamming situation: at first, according to preset PSS local signal, the total reception signal after the detection interference eliminated obtains at least one the 2nd PSS sign synchronization position and second group of corresponding interior numbering.Then,, above-mentioned synchronizing signal is carried out SSS detect, obtain sub-district ID, frame synchronization position and the CP type of each the 3rd sub-district according to extracting synchronizing signal each the 2nd PSS sign synchronization position total reception signal after interference eliminated.
In the embodiment of the invention one; In step 301, obtain the preliminary Search Results of sub-district, eliminated the interfered cell in the preliminary Search Results through the step of interference eliminated in the step 302, therefore; When carrying out Cell searching once more in the step 303; The interference of sub-district without interruption is weaker than the sub-district of interfered cell thereby search with interfered cell with frequency and the indication of sub-district intensity, so has improved the accuracy of homogeneous-frequency adjacent-domain search.
Following reference is shown in Figure 4, and the detailed process of eliminating interfered cell in the step 302 of the invention described above embodiment one is elaborated.
Fig. 4 is the flow chart of step 302 in the method for in homogeneous-frequency adjacent-domain, carrying out Cell searching of the embodiment of the invention one.As shown in Figure 4, this method comprises following process.
Step 401: obtain sub-district to be eliminated.
In this step,,, obtain sub-district intensity indication at least one interfered cell greater than the interference eliminated thresholding at first according to preset interference eliminated thresholding if carry out this step for the first time.Particularly, the interference eliminated thresholding can be provided with according to Signal to Interference plus Noise Ratio (Signal to Interference plus Noise Ratio is called for short SINR).Sub-district intensity indication is interfered cell greater than the sub-district of this interference eliminated thresholding.A kind of preferable embodiment is set Г to be formed in detected sub-district in the step 301, with Strengh
CellIDSub-district intensity indication as the sub-district is provided with the interference eliminated thresholding in advance, and this interference eliminated thresholding is designated as Strength_threshold, and above-mentioned at least one interfered cell is formed set
Then can obtain set according to following formula
Set
In the sub-district that comprised all need be eliminated.Cancellation is: always receive from time domain and eliminate the corresponding signal in sub-district that is comprised in the set
the signal.Particularly; Adopt the mode of serial interference elimination; Promptly according to the sub-district intensity indication of sub-district by strong to weak order, always receive the signal of eliminating the sub-district correspondence that is comprised in the set
the signal from time domain successively.Therefore; Obtain sub-district intensity indication at least one interfered cell according to preset interference eliminated thresholding after greater than the interference eliminated thresholding; Indicate by strong to weak order according to sub-district intensity; Above-mentioned at least one interfered cell is sorted,, get into step 402 to be positioned at the primary sub-district of sequence as sub-district to be eliminated in the ordering.
If right and wrong are carried out this step for the first time, promptly through returning execution in step 401 after the step 406, then at first judge last obtain wait whether eliminate the sub-district is positioned at the sequence end in above-mentioned ordering.If then the process of interfered cell is eliminated in end, promptly end step 302.If last obtain wait that eliminating the sub-district is not to be positioned at the sequence end, then with the sub-district that is positioned at the sequence next bit in the ordering as sub-district to be eliminated, and then entering step 402.For example, in according to ordering, be positioned at the primary sub-district of sequence, when returning step 401, in step 401, in sorting, be positioned at the deputy sub-district of sequence as sub-district to be eliminated as waiting to eliminate sub-district execution of step 402 to step 406.In according to ordering, be positioned at the deputy sub-district of sequence as waiting to eliminate sub-district execution of step 402, when returning step 401, in step 401, in sorting, be positioned at the tertiary sub-district of sequence as sub-district to be eliminated to step 406.By that analogy.
Step 402:, obtain and wait that the SSS that eliminates the sub-district receives signal according to the result that PSS detects and SSS detects.
In this step, handle according to the result that the PSS that carries out in the step 301 detects and SSS detects.Particularly, step 402 comprises following process: the first step, eliminate the PSS sign synchronization position and the CP type of sub-district according to treating in the testing result, and always receive to extract the signal from time domain and wait that the time domain SSS that eliminates the sub-district receives signal.Particularly, the time domain SSS that waits to eliminate the sub-district receives in the signal and comprises totally 128 time-domain sampling points.Second step, treat the time domain SSS reception signal of eliminating the sub-district and carry out Fourier transform, obtain and wait that the frequency domain SSS that eliminates the sub-district receives signal.Particularly, adopt 128 Fourier transform, frequency domain SSS is received signal be designated as R (k), k=0,1,2 ... 127.
Further, before getting into step 403, the frequency domain SSS local signal and the frequency domain PSS local signal of waiting to eliminate the sub-district that also need obtain presetting.Particularly, frequency domain SSS local signal and frequency domain PSS local signal can generate according to the regulation of 3GPP TS 36.211 agreements.With waiting that the frequency domain SSS local signal of eliminating the sub-district is designated as: S (k), k=0,1,2 ... 61; With waiting that the frequency domain PSS local signal of eliminating the sub-district is designated as: P (k), k=0,1,2 ... 61.
Step 403: preset frequency domain SSS local signal and the SSS reception signal of waiting to eliminate the sub-district according to waiting to eliminate the sub-district, obtain the frequency domain SSS channel estimation value of waiting to eliminate the sub-district.In this step, carry out the SSS channel estimating.Particularly, receive signal, obtain the frequency domain estimated value of the SSS channel of waiting to eliminate the sub-district according to the frequency domain SSS local signal of waiting to eliminate the sub-district and frequency domain SSS.The frequency domain estimated value of the SSS channel of waiting to eliminate the sub-district is designated as: H (k), k=0,1,2 ... 61.
Particularly, in this step, can adopt any channel estimation methods, the concrete grammar of channel estimating is not limited.Be that example is explained only below with a kind of channel estimation methods wherein.In the process of channel estimating; For symbol is distinguished; Represent the sequence number of above-mentioned frequency domain SSS local signal with m, represent that with n above-mentioned frequency domain SSS receives the sequence number of signal, representes the sequence number of the frequency domain estimated value of the SSS channel that channel estimating obtains with k; When carrying out channel estimating, at first calculate preliminary channel estimation value according to following formula.
Wherein,
expression is carried out the transposition computing to S (m).k＝0，1，2，…61。
Calculating the preliminary channel estimation value H ' of acquisition (k), k=0,1,2; After 61, can carry out smoothing processing to this value, perhaps this value carried out noise reduction process in time domain at frequency domain; Be transformed into frequency domain after the processing, the final frequency domain estimated value H (k) that obtains to wait to eliminate the SSS channel of sub-district, k=0; 1,2 ... 61.In this step, for the situation of no frequency deviation in the search procedure of adjacent area, the frequency domain estimated value that can be regarded as the PSS channel equates with the frequency domain estimated value of SSS channel.
Step 404: frequency domain SSS channel estimation value and preset frequency domain PSS local signal according to waiting to eliminate the sub-district, obtain the time domain PSS channel reconstruction signal of waiting to eliminate the sub-district.
In this step, specifically comprise following process: the first step, frequency domain SSS channel estimation value and the preset frequency domain PSS local signal of waiting to eliminate the sub-district according to waiting to eliminate the sub-district obtain the frequency domain PSS channel reconstruction signal of waiting to eliminate the sub-district.Particularly, adopt and wait that frequency domain SSS channel estimation value and the frequency domain PSS local signal of eliminating the sub-district multiply each other, promptly H (k) multiplies each other with P (k), obtains the frequency domain PSS channel reconstruction signal of waiting to eliminate the sub-district.After the first step, frequency domain PSS channel reconstruction signal is mended 0, this signal is mended 0 to 128 point, carried out for second step then.Second step, treat the frequency domain PSS channel reconstruction signal of eliminating the sub-district and carry out inverse Fourier transform, obtain the time domain PSS channel reconstruction signal of waiting to eliminate the sub-district.Particularly, carry out inverse Fourier transform to mending the frequency domain PSS channel reconstruction signal that 0 back waiting eliminate the sub-district at 128, with waiting that the time domain PSS channel reconstruction signal of eliminating the sub-district is designated as: p (k), k=0,1,2 ... 127.
Step 405: frequency domain SSS channel estimation value and preset frequency domain SSS local signal according to waiting to eliminate the sub-district, obtain the time domain SSS channel reconstruction signal of waiting to eliminate the sub-district.
In this step, specifically comprise following process: the first step, frequency domain SSS channel estimation value and the preset frequency domain SSS local signal of waiting to eliminate the sub-district according to waiting to eliminate the sub-district obtain the frequency domain SSS channel reconstruction signal of waiting to eliminate the sub-district.Particularly, adopt and wait that frequency domain SSS channel estimation value and the frequency domain PSS local signal of eliminating the sub-district multiply each other, promptly H (k) multiplies each other with S (k), obtains the frequency domain PSS channel reconstruction signal of waiting to eliminate the sub-district.After the first step, frequency domain PSS channel reconstruction signal is mended 0, this signal is mended 0 to 128 point, carried out for second step then.Second step, treat the frequency domain SSS channel reconstruction signal of eliminating the sub-district and carry out inverse Fourier transform, obtain the time domain SSS channel reconstruction signal of waiting to eliminate the sub-district.Particularly, carry out inverse Fourier transform, obtain the time domain SSS channel reconstruction signal of waiting to eliminate the sub-district mending the frequency domain SSS channel reconstruction signal that 0 back waiting eliminate the sub-district at 128; With waiting that the time domain SSS channel reconstruction signal of eliminating the sub-district is designated as: s (k), k=0,1; 2 ... 127.
Step 406: from total reception signal, deduct the time domain PSS channel reconstruction signal of waiting to eliminate the sub-district, time domain SSS channel reconstruction signal, CP and the corresponding CP of time domain SSS channel reconstruction signal that time domain PSS channel reconstruction signal is corresponding, obtain the total reception signal after the interference eliminated.
In this step; Particularly; Always receive from time domain and to deduct the corresponding CP of the time domain PSS channel reconstruction signal p (k) that waits to eliminate the sub-district, time domain SSS channel reconstruction signal s (k), time domain PSS channel reconstruction signal p (k) and the CP of time domain SSS channel reconstruction signal s (k) correspondence the signal, the time domain of obtaining after the interference eliminated always receives signal.After step 406, return step 401.
Said process through step 302 in the method for in homogeneous-frequency adjacent-domain, carrying out Cell searching of the embodiment of the invention shown in Figure 4; Need to confirm the interfered cell of elimination through preset interference eliminated thresholding; Testing result according to this interfered cell in the step 301; Adopt PSS local signal, SSS local signal and SSS to receive signal PSS channel and SSS channel are carried out reconstruct; From total reception signal, deduct PSS channel reconstruction signal, SSS channel reconstruction signal and the corresponding CP of above-mentioned two reconstruction signals that reconstruct obtains, thereby from total reception signal, eliminated interfered cell.
More than carried out detailed introduction through a pair of method of in homogeneous-frequency adjacent-domain, carrying out Cell searching of the embodiment of the invention, introduce in the face of the device of in homogeneous-frequency adjacent-domain, carrying out Cell searching that adopts this method down.
Fig. 5 is the structural representation of in homogeneous-frequency adjacent-domain, carrying out the device of Cell searching of the embodiment of the invention two.Fig. 6 is the structural representation of in homogeneous-frequency adjacent-domain, carrying out the device of Cell searching of the embodiment of the invention three.Like Fig. 5 and shown in Figure 6, the device that should in homogeneous-frequency adjacent-domain, carry out Cell searching comprises: PSS detecting unit, SSS detecting unit and interference cancellation unit.
Wherein, the PSS detecting unit among the embodiment two shown in Fig. 5 is used for that total reception signal is carried out PSS and detects, and the PSS detecting unit among the embodiment three shown in Fig. 6 is used for that the total reception signal after total reception signal and the interference eliminated is carried out PSS and detects.Embodiment two shown in Fig. 5 is identical with SSS detecting unit among the embodiment three shown in Fig. 6, is used for that all the total reception signal after total reception signal and the interference eliminated is carried out SSS and detects.Embodiment two shown in Fig. 5 is identical with interference cancellation unit among the embodiment three shown in Fig. 6; All be used for according to PSS detecting unit and SSS detecting unit testing result total reception signal; Eliminate always to receive treating in the signal and eliminate the corresponding signal in sub-district, obtain the total reception signal after the interference eliminated.
Because can being used for that total reception signal is carried out PSS, the PSS detecting unit detects; Perhaps; Can be used for that also the total reception signal after total reception signal and the interference eliminated is carried out PSS detects; According to above-mentioned two kinds of different execution functions, the annexation between PSS detecting unit and the interference cancellation unit is slightly different, below respectively two kinds of situation is introduced through the embodiment of the invention two and the embodiment of the invention three.
Fig. 5 is the structural representation of in homogeneous-frequency adjacent-domain, carrying out the device of Cell searching of the embodiment of the invention two.As shown in Figure 5, comprise in this device: PSS detecting unit 51, SSS detecting unit 52 and interference cancellation unit 53.
Wherein, the input of PSS detecting unit 51 receives total signal that receives, and is used for that total reception signal is carried out PSS and detects, and obtains the PSS testing result to total reception signal.The input of SSS detecting unit 52 receives total signal and connection PSS detecting unit 51 and interference cancellation unit 53 of receiving; Be used for that the total reception signal after total reception signal and the interference eliminated is carried out SSS and detect, obtain SSS testing result the total reception signal after total reception signal and the interference eliminated.The input of interference cancellation unit 53 receives total signal and connection PSS detecting unit 51 and SSS detecting unit 52 of receiving; Be used for according to 52 pairs of total testing results that receive signal of PSS detecting unit 51 and SSS detecting unit; Eliminate always to receive treating in the signal and eliminate the corresponding signal in sub-district, obtain the total reception signal after the interference eliminated.
Further; 51 pairs of total reception signals of PSS detecting unit carry out the PSS detection and are specially: PSS detecting unit 51 is used for according to preset PSS local signal; The total signal that receives of detection obtains at least one PSS sign synchronization position and first group of corresponding interior numbering.
52 pairs of SSS detecting units are total to be received signals and carry out SSS and detect and be specially: SSS detecting unit 52 extracts synchronizing signal through each PSS sign synchronization position of detecting total reception signal and obtaining according to PSS detecting unit 51 from total reception signal; Synchronizing signal is carried out SSS detect, obtain cell ID ID, frame synchronization position and the cyclic prefix CP type of each first sub-district.And; Total reception signal after 52 pairs of interference eliminated of SSS detecting unit carries out SSS and detects and to be specially: SSS detecting unit 52 according to PSS detecting unit 51 through extracting synchronizing signal each a PSS sign synchronization position total reception signal after interference eliminated that detects total reception signal and obtain; Synchronizing signal is carried out SSS detect, obtain sub-district ID, frame synchronization position and the CP type of each second sub-district.
In the embodiment of the invention two; PSS detecting unit and SSS detecting unit carry out after the Preliminary detection; The total corresponding signal of interfered cell that receives in the signal of interference cancellation unit elimination, the total reception signal before the employing elimination is disturbed once more carries out PSS and detects, and the total reception signal after the employing interference eliminated carries out the SSS detection; Thereby eliminated and disturbed influence, improved the accuracy of homogeneous-frequency adjacent-domain search the homogeneous-frequency adjacent-domain search procedure.The device of in homogeneous-frequency adjacent-domain, carrying out Cell searching of the embodiment of the invention two is applicable to the weak jamming environment.
Fig. 6 is the structural representation of in homogeneous-frequency adjacent-domain, carrying out the device of Cell searching of the embodiment of the invention three.As shown in Figure 6, comprise in this device: PSS detecting unit 61, SSS detecting unit 52 and interference cancellation unit 53.
Wherein, The input of PSS detecting unit 61 receives total reception signal and connects interference cancellation unit 53; Be used for that the total reception signal after total reception signal and the interference eliminated is carried out PSS and detect, obtain PSS testing result the total reception signal after total reception signal and the interference eliminated.The input of SSS detecting unit 52 receives total signal and connection PSS detecting unit 61 and interference cancellation unit 53 of receiving; Be used for that the total reception signal after total reception signal and the interference eliminated is carried out SSS and detect, obtain SSS testing result the total reception signal after total reception signal and the interference eliminated.The input of interference cancellation unit 53 receives total signal and connection PSS detecting unit 61 and SSS detecting unit 52 of receiving; Be used for according to 52 pairs of total testing results that receive signal of PSS detecting unit 61 and SSS detecting unit; Eliminate always to receive treating in the signal and eliminate the corresponding signal in sub-district, obtain the total reception signal after the interference eliminated.
Further, 61 pairs of PSS detecting units are total to be received signals and carry out PSS and detect and be specially: PSS detecting unit 61 is used for according to preset PSS local signal, detects total signal that receives, and obtains numbering at least one PSS sign synchronization position and the corresponding group.Total reception signal after 61 pairs of interference eliminated of PSS detecting unit carries out the PSS detection and is specially: according to preset PSS local signal, the total reception signal after the detection interference eliminated obtains at least one the 2nd PSS sign synchronization position and the interior numbering of group.
52 pairs of SSS detecting units are total to be received signals and carries out SSS and detect and be specially: from total reception signal, extract synchronizing signal through each PSS sign synchronization position of detecting total reception signal and obtaining according to PSS detecting unit 61; Synchronizing signal is carried out SSS detect, obtain sub-district ID, frame synchronization position and the CP type of each first sub-district.Total reception signal after 52 pairs of interference eliminated of SSS detecting unit carries out PSS and detects and to be specially: each the 2nd PSS sign synchronization position that obtains through the total reception signal that detects after the interference eliminated according to PSS detecting unit 61; Extract synchronizing signal total reception signal after interference eliminated; Synchronizing signal is carried out SSS detect, obtain sub-district ID, frame synchronization position and the CP type of each the 3rd sub-district.
In the embodiment of the invention three; PSS detecting unit and SSS detecting unit carry out after the Preliminary detection; Interference cancellation unit is eliminated total corresponding signal of interfered cell that receives in the signal; Adopt total reception signal of eliminating after disturbing to carry out PSS detection and SSS detection once more then, disturb influence, improved the accuracy of homogeneous-frequency adjacent-domain search the homogeneous-frequency adjacent-domain search procedure thereby eliminated.The device of in homogeneous-frequency adjacent-domain, carrying out Cell searching of the embodiment of the invention three is applicable to strong interference environment.
Fig. 7 is the structural representation of interference cancellation unit 53 among the embodiment of the invention two and the embodiment three.As shown in Figure 7; At least comprise in this interference cancellation unit 53: signal obtains subelement 531, SSS channel estimating subelement 532, PSS signal reconstruction subelement 533, SSS signal reconstruction subelement 534 and eliminates subelement 535, and can also comprise: interfered cell obtains subelement 536.
Wherein, signal obtains subelement 531 and is used for according to PSS detecting unit and the SSS detecting unit testing result to total reception signal, obtains and waits that the SSS that eliminates the sub-district receives signal.Particularly; Signal obtains subelement 531 and is used for according to waiting to eliminate the PSS sign synchronization position and the CP type of sub-district; Always receive the signal to extract from time domain and wait that the time domain SSS that eliminates the sub-district receives signal; Treat the time domain SSS reception signal of eliminating the sub-district and carry out Fourier transform, obtain and wait that the frequency domain SSS that eliminates the sub-district receives signal.
SSS channel estimating subelement 532 is used for obtaining the frequency domain SSS channel estimation value of waiting to eliminate the sub-district according to the preset frequency domain SSS local signal and the SSS reception signal of waiting to eliminate the sub-district of waiting to eliminate the sub-district.
PSS signal reconstruction subelement 533 is used for obtaining the time domain PSS channel reconstruction signal of waiting to eliminate the sub-district according to waiting to eliminate the frequency domain SSS channel estimation value and the preset frequency domain PSS local signal of sub-district.Particularly; PSS signal reconstruction subelement 533 is used for according to the SSS channel frequency domain estimated value and the preset frequency domain PSS local signal of waiting to eliminate the sub-district of waiting to eliminate the sub-district; Obtain the PSS channel frequency domain reconstruction signal of waiting to eliminate the sub-district; Treat the PSS channel frequency domain reconstruction signal of eliminating the sub-district and carry out inverse Fourier transform, obtain the PSS channel time domain reconstruction signal of waiting to eliminate the sub-district.
SSS signal reconstruction subelement 534 is used for obtaining the time domain SSS channel reconstruction signal of waiting to eliminate the sub-district according to waiting to eliminate the frequency domain SSS channel estimation value and the preset frequency domain SSS local signal of sub-district.Particularly; SSS signal reconstruction subelement 534 is used for according to the SSS channel frequency domain estimated value and the preset frequency domain SSS local signal of waiting to eliminate the sub-district of waiting to eliminate the sub-district; Obtain the SSS channel frequency domain reconstruction signal of waiting to eliminate the sub-district; Treat the SSS channel frequency domain reconstruction signal of eliminating the sub-district and carry out inverse Fourier transform, obtain the SSS channel time domain reconstruction signal of waiting to eliminate the sub-district.
Eliminate subelement 535 and be used for deducting corresponding CP and the corresponding CP of time domain SSS channel reconstruction signal of time domain PSS channel reconstruction signal, time domain SSS channel reconstruction signal, time domain PSS channel reconstruction signal that waits to eliminate the sub-district, obtain the total reception signal after the interference eliminated from total reception signal.Eliminate subelement 535
On the basis of technique scheme, can also comprise in this interference cancellation unit 53: interfered cell obtains subelement 536.Interfered cell obtains subelement 536 and is used to obtain sub-district intensity indication at least one interfered cell greater than the interference eliminated thresholding, indicates by to weak at least one interfered cell being sorted by force according to sub-district intensity.And, when interfered cell obtains that subelement 536 is first to be carried out, obtain and be positioned at the primary sub-district of sequence in the ordering as sub-district to be eliminated; When interfered cell obtains subelement 536 and carries out once more, obtain be positioned at the sequence next bit in the ordering the sub-district as sub-district to be eliminated.
Adopt interference cancellation unit in the embodiment of the invention shown in Figure 7 two and the embodiment of the invention three; Interference cancellation unit need to confirm the interfered cell of elimination through preset interference eliminated thresholding; PSS signal reconstruction subelement and SSS signal reconstruction subelement carry out reconstruct to PSS signal and SSS signal respectively according to the result that signal obtains subelement and SSS channel estimating subelement; Eliminate subelement and from total reception signal, deduct PSS channel reconstruction signal, SSS channel reconstruction signal and the corresponding CP of above-mentioned two reconstruction signals that reconstruct obtains, thereby from total reception signal, eliminated interfered cell.
The device of in homogeneous-frequency adjacent-domain, carrying out Cell searching that the embodiment of the invention provides can be positioned at a wireless terminal, and said wireless terminal includes but not limited to mobile phone and computer.
Need to prove: for aforesaid each method embodiment; For simple description; So it all is expressed as a series of combination of actions, but those skilled in the art should know that the present invention does not receive the restriction of described sequence of movement; Because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in the specification all belongs to preferred embodiment, and related action and module might not be that the present invention is necessary.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, do not have the part that details among certain embodiment, can be referring to the associated description of other embodiment.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (12)
1. a method of in homogeneous-frequency adjacent-domain, carrying out Cell searching is characterized in that, comprising:
Total reception signal is carried out master sync signal PSS detection and auxiliary synchronous signals SSS detection, obtain the result that PSS detects and SSS detects;
Detect the result who detects with SSS according to said PSS, eliminate the signal that treating in said total reception signal eliminated the sub-district correspondence, obtain the total reception signal after the interference eliminated;
Total reception signal is carried out the PSS detection and the total reception signal after the interference eliminated is carried out the SSS detection, perhaps, the total reception signal after the interference eliminated is carried out PSS detection and SSS detection.
2. method according to claim 1 is characterized in that,
The result that said PSS detects comprises at least one PSS sign synchronization position and first group of interior numbering;
The result that said SSS detects comprises: the cell ID ID of each detected first sub-district, frame synchronization position and CP type.
3. method according to claim 2 is characterized in that, saidly detects the result who detects with SSS according to said PSS, eliminates the signal that treating in said total reception signal eliminated the sub-district correspondence, and the total reception signal that obtains after the interference eliminated comprises:
According to the result that said PSS detects and SSS detects, obtain and wait that the SSS that eliminates the sub-district receives signal;
Preset frequency domain SSS local signal and the SSS reception signal of waiting to eliminate the sub-district according to waiting to eliminate the sub-district obtain the said frequency domain SSS channel estimation value of waiting to eliminate the sub-district;
According to said frequency domain SSS channel estimation value and the preset frequency domain PSS local signal of waiting to eliminate the sub-district, obtain the time domain PSS channel reconstruction signal of waiting to eliminate the sub-district;
According to said frequency domain SSS channel estimation value and the preset frequency domain SSS local signal of waiting to eliminate the sub-district, obtain the time domain SSS channel reconstruction signal of waiting to eliminate the sub-district;
From said total reception signal, deduct the time domain PSS channel reconstruction signal of waiting to eliminate the sub-district, time domain SSS channel reconstruction signal, CP and the corresponding CP of time domain SSS channel reconstruction signal that time domain PSS channel reconstruction signal is corresponding, obtain the total reception signal after the said interference eliminated.
4. method according to claim 3 is characterized in that,
Saidly detect the result who detects with SSS, obtain the SSS that waits to eliminate the sub-district and receive signal and comprise:, always receive the signal extraction from time domain and wait to eliminate the time domain SSS reception signal of sub-district according to PSS sign synchronization position and the CP type of waiting to eliminate the sub-district according to said PSS; The said time domain SSS reception signal of eliminating the sub-district of waiting is carried out Fourier transform, obtain and wait that the frequency domain SSS that eliminates the sub-district receives signal;
Said according to said frequency domain SSS channel estimation value and the preset frequency domain PSS local signal of waiting to eliminate the sub-district; Obtain and wait that the time domain PSS channel reconstruction signal of eliminating the sub-district comprises:, obtain the frequency domain PSS channel reconstruction signal of waiting to eliminate the sub-district according to the said frequency domain SSS channel frequency domain estimated value and the preset frequency domain PSS local signal of waiting to eliminate the sub-district of waiting to eliminate the sub-district; The said frequency domain PSS channel reconstruction signal of eliminating the sub-district of waiting is carried out inverse Fourier transform, obtain the time domain PSS channel reconstruction signal of waiting to eliminate the sub-district;
Said according to said frequency domain SSS channel estimation value and the preset frequency domain SSS local signal of waiting to eliminate the sub-district; Obtain and wait that the time domain SSS channel reconstruction signal of eliminating the sub-district comprises:, obtain the frequency domain SSS channel reconstruction signal of waiting to eliminate the sub-district according to the said frequency domain SSS channel estimation value and the preset frequency domain SSS local signal of waiting to eliminate the sub-district of waiting to eliminate the sub-district; The said frequency domain SSS channel reconstruction signal of eliminating the sub-district of waiting is carried out inverse Fourier transform, obtain the time domain SSS channel reconstruction signal of waiting to eliminate the sub-district.
5. according to claim 3 or 4 described methods, it is characterized in that, also comprise: obtain sub-district intensity indication at least one interfered cell greater than the interference eliminated thresholding; Indicate by to weak said at least one interfered cell being sorted by force according to sub-district intensity; Obtain and be positioned at primary sub-district in the ordering as sub-district to be eliminated;
Said corresponding CP and the corresponding CP of time domain SSS channel reconstruction signal of time domain PSS channel reconstruction signal, time domain SSS channel reconstruction signal, time domain PSS channel reconstruction signal that waits to eliminate the sub-district that from said total reception signal, deduct also comprises afterwards: obtain the conduct sub-district to be eliminated, sub-district that is positioned at the sequence next bit in the ordering, repeat said corresponding CP and the corresponding CP of time domain SSS channel reconstruction signal of time domain PSS channel reconstruction signal, time domain SSS channel reconstruction signal, time domain PSS channel reconstruction signal that waits to eliminate the sub-district that from said total reception signal, deduct.
6. according to any described method in the claim 1 to 5, it is characterized in that,
Said total reception signal is carried out that PSS detects and the total reception signal after the interference eliminated carried out SSS detect and comprise: according to preset time domain PSS local signal; Detect said total reception signal, obtain at least one PSS sign synchronization position and first group of interior numbering; According to extracting synchronizing signal each a PSS sign synchronization position total reception signal after interference eliminated, said synchronizing signal is carried out SSS detect, obtain sub-district ID, frame synchronization position and the CP type of each detected second sub-district;
Saidly total reception signal after the interference eliminated is carried out PSS detect to detect and comprise: according to preset time domain PSS local signal, detect the total reception signal after the said interference eliminated, obtain at least one the 2nd PSS sign synchronization position and second group and number with SSS; According to extracting synchronizing signal each the 2nd PSS sign synchronization position total reception signal after interference eliminated, said synchronizing signal is carried out SSS detect, obtain sub-district ID, frame synchronization position and the CP type of each detected the 3rd sub-district.
7. a device of in homogeneous-frequency adjacent-domain, carrying out Cell searching is characterized in that, comprising:
The PSS detecting unit; Being used for that total reception signal is carried out PSS detects; Obtain PSS testing result to total reception signal; Be used for that perhaps the total reception signal after total reception signal and the interference eliminated is carried out PSS and detect, obtain PSS testing result the total reception signal after total reception signal and the interference eliminated;
The SSS detecting unit is used for that the total reception signal after total reception signal and the interference eliminated is carried out SSS and detects, and obtains the SSS testing result to the total reception signal after total reception signal and the interference eliminated;
Interference cancellation unit is used for according to said PSS detecting unit and the said SSS detecting unit testing result to total reception signal, eliminates treating in said total reception signal and eliminates the corresponding signal in sub-district, obtains the total reception signal after the interference eliminated.
8. device according to claim 7 is characterized in that, said interference cancellation unit specifically comprises:
Signal obtains subelement, is used for according to said PSS detecting unit and the SSS detecting unit testing result to said total reception signal, obtains and waits that the SSS that eliminates the sub-district receives signal;
SSS channel estimating subelement is used for obtaining the said frequency domain SSS channel estimation value of waiting to eliminate the sub-district according to the preset frequency domain SSS local signal and the SSS reception signal of waiting to eliminate the sub-district of waiting to eliminate the sub-district;
PSS signal reconstruction subelement is used for frequency domain SSS channel estimation value and the preset frequency domain PSS local signal of waiting to eliminate the sub-district according to said, obtains the time domain PSS channel reconstruction signal of waiting to eliminate the sub-district;
SSS signal reconstruction subelement is used for frequency domain SSS channel estimation value and the preset frequency domain SSS local signal of waiting to eliminate the sub-district according to said, obtains the time domain SSS channel reconstruction signal of waiting to eliminate the sub-district;
Eliminate subelement; Be used for deducting the time domain PSS channel reconstruction signal of waiting to eliminate the sub-district, time domain SSS channel reconstruction signal, CP and the corresponding CP of time domain SSS channel reconstruction signal that time domain PSS channel reconstruction signal is corresponding, obtain the total reception signal after the said interference eliminated from said total reception signal.
9. device according to claim 8 is characterized in that,
Said signal obtains subelement and specifically is used for according to waiting to eliminate the PSS sign synchronization position and the CP type of sub-district; Always receive the signal to extract from time domain and wait that the time domain SSS that eliminates the sub-district receives signal; The said time domain SSS reception signal of eliminating the sub-district of waiting is carried out Fourier transform, obtain and wait that the frequency domain SSS that eliminates the sub-district receives signal;
PSS signal reconstruction subelement specifically is used for the frequency domain SSS channel estimation value and the preset frequency domain PSS local signal of waiting to eliminate the sub-district of waiting to eliminate the sub-district according to said; Obtain the frequency domain PSS channel reconstruction signal of waiting to eliminate the sub-district; The said frequency domain PSS channel reconstruction signal of eliminating the sub-district of waiting is carried out inverse Fourier transform, obtain the time domain PSS channel reconstruction signal of waiting to eliminate the sub-district;
SSS signal reconstruction subelement specifically is used for the frequency domain SSS channel estimation value and the preset frequency domain SSS local signal of waiting to eliminate the sub-district of waiting to eliminate the sub-district according to said; Obtain the frequency domain SSS channel reconstruction signal of waiting to eliminate the sub-district; The said frequency domain SSS channel reconstruction signal of eliminating the sub-district of waiting is carried out inverse Fourier transform, obtain the time domain SSS channel reconstruction signal of waiting to eliminate the sub-district.
10. according to Claim 8 or 9 described devices, it is characterized in that said interference cancellation unit also comprises:
Interfered cell obtains subelement; Be used to obtain sub-district intensity indication at least one interfered cell greater than the interference eliminated thresholding; Indicate by to weak said at least one interfered cell being sorted by force according to sub-district intensity; Obtain during first the execution and be positioned at primary sub-district in the ordering as sub-district to be eliminated, obtain when carrying out once more be positioned at the sequence next bit in the ordering the sub-district as sub-district to be eliminated.
11. according to any described device in the claim 7 to 10, it is characterized in that,
Said PSS detecting unit specifically is used for detecting said total reception signal according to preset time domain PSS local signal, obtains at least one PSS sign synchronization position and first group of interior numbering;
Said SSS detecting unit specifically is used for extracting synchronizing signal through each PSS sign synchronization position of detecting total reception signal and obtaining from total reception signal according to the PSS detecting unit; Said synchronizing signal is carried out SSS to be detected; Obtain cell ID ID, frame synchronization position and the cyclic prefix CP type of each detected first sub-district; Also specifically be used for extracting synchronizing signal through each PSS sign synchronization position of detecting total reception signal and obtaining total reception signal after the interference eliminated according to the PSS detecting unit; Said synchronizing signal is carried out SSS detect, obtain sub-district ID, frame synchronization position and the CP type of each detected second sub-district.
12. according to any described device in the claim 7 to 10, it is characterized in that,
Said PSS detecting unit specifically is used for according to preset time domain PSS local signal; Detect said total reception signal; Obtain at least one PSS sign synchronization position and first group of interior numbering; Also specifically be used for according to preset time domain PSS local signal, detect the total reception signal after the said interference eliminated, obtain numbering at least one the 2nd PSS sign synchronization position and second group;
Said SSS detecting unit specifically is used for extracting synchronizing signal through each PSS sign synchronization position of detecting total reception signal and obtaining from total reception signal according to the PSS detecting unit; Said synchronizing signal is carried out SSS to be detected; Obtain cell ID ID, frame synchronization position and the cyclic prefix CP type of each detected first sub-district; Also specifically be used for each the 2nd PSS sign synchronization position of obtaining through the total reception signal that detects after the interference eliminated according to the PSS detecting unit; Extract synchronizing signal total reception signal after interference eliminated; Said synchronizing signal is carried out SSS detect, obtain sub-district ID, frame synchronization position and the CP type of each detected the 3rd sub-district.
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| CN110868745A (en) * | 2018-08-28 | 2020-03-06 | 中国移动通信有限公司研究院 | Narrow-band Internet of things NB-IOT cell reselection method and drive test equipment |
| CN110868745B (en) * | 2018-08-28 | 2021-10-26 | 中国移动通信有限公司研究院 | Narrow-band Internet of things NB-IOT cell reselection method and drive test equipment |
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