CN106162693B - A kind of designated area searching method and terminal - Google Patents
A kind of designated area searching method and terminal Download PDFInfo
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- CN106162693B CN106162693B CN201510163106.8A CN201510163106A CN106162693B CN 106162693 B CN106162693 B CN 106162693B CN 201510163106 A CN201510163106 A CN 201510163106A CN 106162693 B CN106162693 B CN 106162693B
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Abstract
The present invention provides a kind of designated area searching methods, comprising: S1. carries out cell ID ID detection according to the signal being currently received；S2. judge whether the cell ID detected and preassigned cell ID are identical, if they are the same, then follow the steps S3；S3. offset estimation is carried out using subsequently received signal and frequency deviation compensates；S4. judge whether the estimated value of the offset estimation is less than preset frequency deviation threshold value, if being less than, frequency deviation convergence executes step S5；S5. Physical Broadcast Channel PBCH decoding is carried out, if decoding is correct, designated area is searched for successfully.The present invention can be improved designated area search accuracy, and due to eliminate it is blind search, improve designated area search speed.
Description
Technical field
The present invention relates to fields of communication technology, and in particular to a kind of designated area searching method and terminal.
Background technique
In channel wireless radio multi communication system, entire discrete band resource is divided into 40 subbands, including 3
Synchronous subband and 37 service sub-bands, are respectively belonging to 3 different clusters.Synchronous subband be mainly used for cell searching, synchronization and
Broadcast reception, service sub-band are mainly used for the transmission of uplink and downlink data.Each cluster includes a synchronous subband and several business
Band (as shown in Figure 1).
In channel wireless radio multi communication system, cell need to carry out designated area search when rebuilding, and existing designated area is searched
Suo Liucheng are as follows: (1) carry out Symbol Timing and offset estimation using the synchronization signal of designated area ID；(2) frequency deviation restrains；(3)
PBCH demodulation；(4) blind to search.
In the prior art step (1) using designated area ID carry out Symbol Timing estimation, offset estimation, frequency compensation,
And without sector ID detection and cell ID detection.In this way, subsequent frequency deviation can not restrain if there is interference leads to bad timing,
At this moment it carries out blind searching cell again, it is possible to cause co-frequency cell to go offline with the UE of identical RNTI into co-frequency cell.
Summary of the invention
For the defects in the prior art, the present invention provides a kind of designated area searching method, during solving blind search
The problem that the UE of appearance goes offline and search speed is slow.
In order to solve the above technical problems, the present invention the following technical schemes are provided:
In a first aspect, the present invention provides a kind of designated area searching methods, comprising:
S1. cell ID ID detection is carried out according to the signal being currently received；
S2. judge whether the cell ID detected and preassigned cell ID are identical, if they are the same, then follow the steps S3；
S3. offset estimation is carried out using subsequently received signal and frequency deviation compensates；
S4. judge whether the estimated value of the offset estimation is less than preset frequency deviation threshold value, if being less than, frequency deviation convergence,
Execute step S5；
S5. Physical Broadcast Channel PBCH decoding is carried out, if decoding is correct, designated area is searched for successfully.
Wherein, before step S2 further include:
It continues to signal and carries out cell ID detection；
Judge whether cell ID that this is detected and the cell ID that step S1 is detected are consistent, if unanimously, executing step
Rapid S2；Otherwise, it continues to signal and carries out cell ID detection, until executing step after cell ID detection is consistent twice in succession
S2。
Wherein, the method also includes:
After cell ID detection number reaches pre-set cell ID detection frequency threshold value, no longer progress cell ID inspection
It surveys, designated area search failure.
Wherein, the method also includes:
If the cell ID detected is different from preassigned cell ID, designated area search failure.
Wherein, in step S4 further include:
Multiple offset estimation and frequency deviation compensation are carried out, judges whether continuous n times offset estimation value is respectively less than preset frequency deviation
Threshold value, if being less than, frequency deviation convergence, wherein n is positive integer.
Wherein, the method also includes:
If offset estimation number is more than pre-set offset estimation frequency threshold value, designated area search failure.
Wherein, the step S1 includes: according to the data progress cell ID ID detection being currently received
Calculate separately the relevant peaks of the signal being currently received and three preset local primary synchronization signal PSC sequences
Peak value；
It determines the corresponding PSC sequence of the maximum peak value, sector ID is determined according to the PSC sequence, while according to maximum
The peak value relevant peaks where position, complete timing synchronization；
Offset estimation value is obtained according to determining PSC sequence, frequency offset correction is carried out to the signal received；
The signal received includes primary synchronization signal PSC sequence and secondary synchronization signal SSC sequence, according to frequency offset correction
The SSC sequence afterwards carries out cell group ID detection, obtains cell group ID；
According to the sector ID and the cell group ID, the cell ID is obtained.
Wherein, according to the sector ID and the cell group ID, obtaining the cell ID includes:
It sums again with cell group ID after the sector ID is multiplied with 3, obtains the cell ID.
Second aspect, the present invention also provides a kind of terminals, including cell ID detection unit, judging unit, frequency deviation to estimate
Meter and compensating unit, decoding unit and result output unit；
The cell ID detection unit, for carrying out cell ID ID detection according to the signal being currently received；
The judging unit, for judging cell ID that the cell ID detection unit detects and preassigned small
Whether area ID is identical；
The offset estimation and compensating unit, for determining the cell ID detection unit detection in the judging unit
When the cell ID arrived is identical with preassigned cell ID, offset estimation is carried out using subsequently received signal and frequency deviation is mended
It repays；
The judging unit is also used to judge that the offset estimation and compensating unit carry out the estimated value that offset estimation obtains
Whether preset frequency deviation threshold value is less than；
The decoding unit, for determining that the offset estimation and compensating unit carry out offset estimation in the judging unit
When obtained estimated value is less than preset frequency deviation threshold value, Physical Broadcast Channel PBCH decoding is carried out；
Whether the judging unit is also used to judge decoding unit correct decoding；
The result output unit, for exporting when the judging unit determines the decoding unit correct decoding
Designated area searches for successful message.
Wherein, the cell ID detection unit is also used to repeatedly carry out cell ID ID detection；
The judging unit is also used to judge whether is cell ID that the cell ID detection unit detects twice in succession
Unanimously；
The cell ID detection unit is also used to determine that the cell ID detection unit is continuous in the judging unit
In the case that the cell ID detected twice is inconsistent, continue cell ID detection.
As shown from the above technical solution, designated area searching method of the present invention, the cell ID that first will test with
Preassigned cell ID compares, and if they are the same, then carries out subsequent processing, and eliminate in existing designated area searching method blind searches
Part improves the accuracy and search speed of designated area search, solves existing blind search of designated area search and draws in the process
The UE disconnection risen, while also improving designated area search speed.In addition, designated area searching method of the present invention
It, can be compatible with currently assigned cell searching system with preferable compatibility.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of flow chart of designated area searching method provided by one embodiment of the present invention；
Fig. 2 is the flow chart of another designated area searching method provided by one embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of terminal provided by one embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Fig. 1 shows a kind of flow chart of designated area searching method provided by one embodiment of the present invention, referring to Fig. 1,
This method comprises:
Step 101: cell ID ID detection is carried out according to the signal being currently received.
Step 102: judging whether the cell ID detected and preassigned cell ID are identical, if they are the same, then execute step
Rapid 103.
Step 103: carrying out offset estimation using subsequently received signal and frequency deviation compensates.
Step 104: judging whether the estimated value of the offset estimation is less than preset frequency deviation threshold value, if being less than, frequency deviation
Convergence executes step 105, otherwise designated area search failure.
Step 105: carrying out Physical Broadcast Channel PBCH decoding, if decoding is correct, designated area is searched for successfully.
Designated area searching method described in the present embodiment, the cell ID that first will test and preassigned cell ID ratio
Compared with, if they are the same, then carry out subsequent processing, eliminate in existing designated area searching method it is blind search part, improve specify it is small
The accuracy and search speed of area searching solve existing designated area and search for caused UE disconnection during blind search, together
When also improve designated area search speed.In addition, designated area searching method described in the present embodiment has preferable compatibility
Property, it can be compatible with currently assigned cell searching system.
Fig. 2 shows a kind of flow charts of designated area searching method provided by one embodiment of the present invention, referring to fig. 2,
This method comprises:
Step 201: cell ID ID detection is carried out according to the signal being currently received.
In this step, preferred to carry out AGC adjustment, signal amplitude is adjusted to OK range, wherein cell ID ID is examined
Survey includes:
A1. it is related to three preset local primary synchronization signal PSC sequences to calculate separately the signal that is currently received
The peak value at peak；
A2. it determines the corresponding PSC sequence of the maximum peak value, sector ID is determined according to the PSC sequence, while according to most
Timing synchronization is completed in position where the relevant peaks of the big peak value；
A3. offset estimation value is obtained according to determining PSC sequence, frequency offset correction is carried out to the signal received；
A4. the signal received includes primary synchronization signal PSC sequence and secondary synchronization signal SSC sequence, according to frequency deviation
The SSC sequence after correction carries out cell group ID detection, obtains cell group ID；
A5. according to the sector ID and the cell group ID, the cell ID is obtained.
Preferably, it sums again with cell group ID after the sector ID being multiplied with 3, obtains the cell ID.
Step 202: continuing to signal and carry out cell ID detection.
In this step, it is referred to mode described in step 201 and carries out cell ID detection.
Step 203: judge the cell ID that this (the last time) the detects and cell ID that step 201 detects whether one
It causes, if unanimously, thening follow the steps 204；Otherwise, it continues to signal and carries out cell ID detection, until cell ID twice in succession
After detection is consistent, step 204 is executed.
In this step, if after cell ID detection number reaches pre-set cell ID detection frequency threshold value, no longer into
Row cell ID detection, designated area search failure, generally, it is 4~8 that cell ID, which detects frequency threshold value,.
Step 204: judging whether the cell ID detected and preassigned cell ID are identical, if they are the same, then execute step
Rapid 205.
In this step, if the cell ID detected is different from preassigned cell ID, designated area search failure.
Step 205: carrying out offset estimation using subsequently received signal and frequency deviation compensates.
In this step, comprising: carry out multiple offset estimation and frequency deviation compensation.
Step 206: judging whether the estimated value of the offset estimation is less than preset frequency deviation threshold value, if being less than, frequency deviation
Convergence executes step 207.
In this step, comprising: judge whether continuous n times offset estimation value is respectively less than preset frequency deviation threshold value, if being less than,
Then frequency deviation restrains, and executes step 207, and otherwise, designated area search failure, wherein n is positive integer.Preferably, n value be 3~
5, wherein preset frequency deviation threshold value needs to determine according to the other channel demodulation demands of system, 0.015 son is chosen in the present embodiment
Carrier wave interval.
Wherein, if offset estimation number is more than pre-set offset estimation frequency threshold value, designated area search fails, this
In, the general value of offset estimation frequency threshold value is 5~8.
Step 207: carrying out Physical Broadcast Channel PBCH decoding, if decoding is correct, designated area is searched for successfully.
Designated area searching method described in the present embodiment, the cell ID that first will test and preassigned cell ID ratio
Compared with, if they are the same, then carry out subsequent processing, eliminate in existing designated area searching method it is blind search part, improve specify it is small
The accuracy and search speed of area searching solve existing designated area and search for caused UE disconnection during blind search, together
When also improve designated area search speed.In addition, designated area searching method described in the present embodiment has preferable compatibility
Property, it can be compatible with currently assigned cell searching system.
Fig. 3 shows a kind of structural schematic diagram of terminal provided by one embodiment of the present invention, referring to Fig. 3, the terminal packet
Include cell ID detection unit 31, judging unit 32, offset estimation and compensating unit 33, decoding unit 34 and result output unit
35；
The cell ID detection unit 31, for carrying out cell ID ID detection according to the signal being currently received；
The judging unit 32, for judging cell ID that the cell ID detection unit detects and preassigned
Whether cell ID is identical；
The offset estimation and compensating unit 33, for determining the cell ID detection unit inspection in the judging unit
When the cell ID measured is identical with preassigned cell ID, offset estimation is carried out using subsequently received signal and frequency deviation is mended
It repays；
The judging unit 32 is also used to judge that the offset estimation and compensating unit carry out the estimation that offset estimation obtains
Whether value is less than preset frequency deviation threshold value；
The decoding unit 34, for determining that the offset estimation and compensating unit carry out frequency deviation and estimate in the judging unit
When counting obtained estimated value less than preset frequency deviation threshold value, Physical Broadcast Channel PBCH decoding is carried out；
Whether the judging unit 32 is also used to judge decoding unit correct decoding；
The result output unit 35, it is defeated for when the judging unit determines the decoding unit correct decoding
Designated area searches for successful message out.
Wherein, the cell ID detection unit 31 is also used to repeatedly carry out cell ID ID detection；
The judging unit 32 is also used to judge the cell ID that the cell ID detection unit 31 detects twice in succession
It is whether consistent；
The cell ID detection unit 31 is also used to determine the cell ID detection unit in the judging unit 32
In the case that the cell ID detected twice in succession is inconsistent, continue cell ID detection.
The judging unit 32 is also used to determine the cell ID detection unit 31 twice in succession in the judging unit
Under the cell ID unanimous circumstances detected, cell ID that the cell ID detection unit detects and preassigned is judged
Whether cell ID is identical.
The judging unit 32 is also used to judge whether cell ID detection number is more than preset cell ID detection number threshold
Value.
The result output unit 35 is also used to determine that cell ID detection number is more than preset in the judging unit 32
When cell ID detects frequency threshold value, output designated area searches for failure news.
The result output unit 35 is also used to determine that the cell ID detection unit detects in the judging unit
Cell ID with preassigned cell ID difference when, output designated area search for failure news.
The offset estimation and compensating unit 33 are also used to repeatedly carry out row offset estimation and frequency deviation compensation.
The judging unit 32 is also used to judge that the offset estimation and the continuous n times of compensating unit carry out offset estimation and obtain
Estimated value whether be respectively less than preset frequency deviation threshold value.
The decoding unit 34 be also used to the judging unit determine the offset estimation and the continuous n times of compensating unit into
When the estimated value that row offset estimation obtains is respectively less than preset frequency deviation threshold value, Physical Broadcast Channel PBCH decoding is carried out.
The judging unit 32 is also used to judge that the offset estimation number of the offset estimation and the progress of compensating unit 33 is
No is more than preset offset estimation frequency threshold value.
The result output unit 35 is also used to determine the offset estimation and compensating unit 33 in the judging unit 32
When the offset estimation number of progress is more than preset offset estimation frequency threshold value, output designated area searches for failure news.
The result output unit 35 is also used to when the judging unit determines the decoding unit decoding failure, output
Designated area searches for failure news.
Terminal described in the present embodiment can be used for executing method described in above-described embodiment, and principle is similar with effect,
And will not be described here in detail.
The above examples are only used to illustrate the technical scheme of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these are modified or replace
It changes, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of designated area searching method characterized by comprising
S1. cell ID ID detection is carried out according to the signal being currently received；
S2. judge whether the cell ID detected and preassigned cell ID are identical, if they are the same, then follow the steps S3；
S3. offset estimation is carried out using subsequently received signal and frequency deviation compensates；
S4. judge whether the estimated value of the offset estimation is less than preset frequency deviation threshold value, if being less than, frequency deviation convergence is executed
Step S5；
S5. Physical Broadcast Channel PBCH decoding is carried out, if decoding is correct, designated area is searched for successfully；
Wherein, the signal received includes primary synchronization signal PSC sequence and secondary synchronization signal SSC sequence.
2. the method according to claim 1, wherein before step S2 further include:
It continues to signal and carries out cell ID detection；
Judge whether cell ID that this is detected and the cell ID that step S1 is detected are consistent, if unanimously, thening follow the steps S2；
Otherwise, it continues to signal and carries out cell ID detection, until executing step S2 after cell ID detection is consistent twice in succession.
3. according to the method described in claim 2, it is characterized by further comprising:
After cell ID detection number reaches pre-set cell ID detection frequency threshold value, no longer progress cell ID detection refers to
Determine cell searching failure.
4. the method according to claim 1, wherein further include: if the cell ID detected with it is preassigned
Cell ID is different, then designated area search failure.
5. the method according to claim 1, wherein in step S4 further include:
Multiple offset estimation and frequency deviation compensation are carried out, judges whether continuous n times offset estimation value is respectively less than preset frequency deviation threshold value,
If being less than, frequency deviation convergence, wherein n is positive integer.
6. according to the method described in claim 5, it is characterized by further comprising:
If offset estimation number is more than pre-set offset estimation frequency threshold value, designated area search failure.
7. the method according to claim 1, wherein the step S1 is small according to the data progress being currently received
Area mark ID, which is detected, includes:
Calculate separately the peak of the relevant peaks of the signal being currently received and three preset local primary synchronization signal PSC sequences
Value；
It determines the corresponding PSC sequence of the maximum peak value, sector ID is determined according to the PSC sequence, while according to maximum institute
The position where the relevant peaks of peak value is stated, timing synchronization is completed；
Offset estimation value is obtained according to determining PSC sequence, frequency offset correction is carried out to the signal received；
The signal received includes primary synchronization signal PSC sequence and secondary synchronization signal SSC sequence, after frequency offset correction
The SSC sequence carries out cell group ID detection, obtains cell group ID；
According to the sector ID and the cell group ID, the cell ID is obtained.
8. designated area searching method according to claim 7, which is characterized in that according to the sector ID and the cell
Group ID, obtaining the cell ID includes:
It sums again with cell group ID after the sector ID is multiplied with 3, obtains the cell ID.
9. a kind of terminal, which is characterized in that including cell ID detection unit, judging unit, offset estimation and compensating unit, translate
Code unit and result output unit；
The cell ID detection unit, for carrying out cell ID ID detection according to the signal being currently received；
The judging unit, for judging cell ID and preassigned cell ID that the cell ID detection unit detects
It is whether identical；
The offset estimation and compensating unit, for determining what the cell ID detection unit detected in the judging unit
When cell ID is identical with preassigned cell ID, offset estimation is carried out using subsequently received signal and frequency deviation compensates；
The judging unit, is also used to judge whether the offset estimation and compensating unit carry out estimated value that offset estimation obtains
Less than preset frequency deviation threshold value；
The decoding unit, for determining that the offset estimation and compensating unit carry out offset estimation and obtain in the judging unit
Estimated value be less than preset frequency deviation threshold value when, carry out Physical Broadcast Channel PBCH decoding；
Whether the judging unit is also used to judge decoding unit correct decoding；
The result output unit, for when the judging unit determines the decoding unit correct decoding, output to be specified
The successful message of cell searching；
Wherein, the signal received includes primary synchronization signal PSC sequence and secondary synchronization signal SSC sequence.
10. terminal according to claim 9, which is characterized in that the cell ID detection unit is also used to repeatedly carry out
Cell ID ID detection；
Whether the cell ID that the judging unit is also used to judge that the cell ID detection unit detects twice in succession is consistent；
The cell ID detection unit is also used to determine the cell ID detection unit twice in succession in the judging unit
In the case that the cell ID detected is inconsistent, continue cell ID detection.
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| TW201931813A (en) * | 2018-01-09 | 2019-08-01 | 財團法人資訊工業策進會 | Wireless communication device and time and frequency synchronization method and non-transitory computer readable medium of the same |
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