CN107360616B - A method of search LTE multiple cell - Google Patents
A method of search LTE multiple cell Download PDFInfo
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- CN107360616B CN107360616B CN201710571696.7A CN201710571696A CN107360616B CN 107360616 B CN107360616 B CN 107360616B CN 201710571696 A CN201710571696 A CN 201710571696A CN 107360616 B CN107360616 B CN 107360616B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
Abstract
The invention discloses a kind of method for searching for LTE multiple cell, include the following steps: that (1) processing primary synchronization signal obtains ID number and corresponding synchronous point in cell group；(2) obtain synchronous point and corresponding group in ID number；(3) each PCI is handled；(4), parsing control format indicates channel；(5), control channel is scrambled by S-RNTI, is descrambled using SI-RNTI value to decoding data；(6), shared channel is parsed；(7) multiple candidate PCI are successively handled, the system parameter of each respective cell PCI is obtained, complete the search to multiple cells.The present invention only needs to handle a primary synchronization signal and secondary synchronization signal, just can obtain multiple candidates physical area ID number and corresponding synchronous point, then handled for each physical area ID number, just can complete the synchronization of multiple cells, it is low with operand, handle simple and convenient feature.
Description
Technical field
The present invention relates to the technical fields of mobile communication, more specifically to a kind of method for searching for LTE multiple cell.
Background technique
LTE is the long term evolution for the UMTS technical standard organized to set up by 3GPP, introduces the key technologies such as OFDM and MIMO,
Spectrum efficiency and message transmission rate are significantly increased, and various bandwidth is supported to distribute, and supports the 2G/3G frequency range of global mainstream
With some newly-increased frequency ranges, thus frequency spectrum distribution is more flexible, and power system capacity and covering are also obviously improved, and are a kind of quasi- 4G communication marks
It is quasi-.LTE cell searching is exactly to obtain and synchronous and cell system parameter the process of Cell time and frequency.Pass through first
It handles primary synchronization signal and secondary synchronization signal obtains the PCI of cell, the deadline is synchronous with frequency；Then parsing broadcast letter
Road obtains System Frame Number, the parameters such as bandwidth；Then parsing control format indicates channel, obtains down control channel symbol numbers；
After obtaining the symbol numbers of down control channel, the parsing to the channel is completed, the configuration information of DSCH Downlink Shared Channel is obtained；Most
After parse DSCH Downlink Shared Channel, obtain the search process that cell system message completes cell.However, in specific applications, when
When needing to search for multiple cells, it is not only time-consuming that each cell searching requires repetition operating procedure mentioned above, but also wants
Dependent on synchronous point performance is calculated, the cell number searched is influenced.
Summary of the invention
The shortcomings that it is a primary object of the present invention to overcome the prior art and deficiency, a method of search LTE multiple cell.
In order to achieve the above object, the invention adopts the following technical scheme:
The invention discloses a kind of methods for searching for LTE multiple cell, include the following steps:
(1) processing primary synchronization signal obtains ID number and corresponding synchronous point in cell group, the main synchronous letter in LTE system
Number by multiple groups ZC Sequence composition, ID number in the corresponding cell group of every group of ZC sequence, since ZC sequence has good correlation,
The data of eating dishes without rice or wine of acquisition are directly subjected to operation with local ZC sequence and obtain ID number and corresponding synchronous point in cell group；
(2) according to ID number in the synchronous point of step (1) acquisition and corresponding group, secondary synchronization signal, secondary synchronization signal are handled
Be made of m-sequence, share 168 kinds of combinations, gradually descramble according to the generating mode of sequence, finally using m-sequence correlation into
Row judgement, and using the detection of noncoherent detection method progress secondary synchronization signal, obtain the corresponding 168 kinds of m-sequences of each synchronous point
One group, then according to ID in cell group, obtain corresponding PCI value, frame synchronization point, cyclic prefix configuration and dual-mode ginseng
Number；
(3) PCI, frame synchronization point, cyclic prefix configuration and the dual-mode of multiple candidate cells are obtained according to step (2),
Then each PCI is handled in sequence, first parsing broadcast channel, obtain downlink bandwidth, System Frame Number parameter；
(4) parameter obtained according to the broadcast channel of step (3) parsing then parses control format and indicates channel, obtains
The symbol numbers of control channel；
(5) control channel being parsed according to the symbol numbers that step (4) obtain, control channel is scrambled by S-RNTI,
Decoding data is descrambled using SI-RNTI value, obtains DCI content；
(6) the DCI content obtained according to step (5) parses shared channel, obtains the system message of cell, completes one
The search of candidate PCI；
(7) multiple candidate PCI are successively handled, the system parameter of each respective cell PCI is obtained, are completed to multiple cells
Search.
As a preferred technical solution, in step (1), using fast FFT algorithm by eat dishes without rice or wine data and the local ZC of acquisition
Sequence carries out operation, and the data that will first eat dishes without rice or wine and local sequence go to frequency domain, then conjugate multiplication returns again to time domain, if calculate
Peak value is greater than setting threshold value, so that it may determine ID number and corresponding synchronous point in cell group.
As a preferred technical solution, in step (2), the position of synchronization signal is extracted according to different prefix types, with
Fixed m-sequence does multiply-accumulate calculating, and peak value is calculated, and then judges peak value whether greater than thresholding, if it is greater than thresholding
Then available current synchronous point and No. PCI.
As a preferred technical solution, in step (2), in step (2), auxiliary synchronous letter is handled using noncoherent detection method
Number, processing method are as follows:
(2-1) extracts secondary synchronization signal according to prefix types in the time domain；
(2-2) carries out FFT transform and obtains frequency-region signal；
(2-3) carries out descrambling operation to frequency domain data using fixed sequence；
(2-4) carries out multiply-accumulate calculating using the data and fixed sequence obtained after descrambling operation, obtains relevant peaks
Value judges that peak value whether greater than thresholding, is frame synchronization point if it is greater than then corresponding synchronous point, completes the inspection of secondary synchronization signal
It surveys.
As a preferred technical solution, in step (3), the method that parses broadcast channel are as follows:
Broadcast channel repeats transmission 4 times in 40ms, and the 2nd time slot of the 1st subframe of each radio frames is located in time domain
Preceding 4 symbols on, be located in the middle on frequency domain on 72 subcarriers, using sliding window method to broadcast channel carry out blind examination, until
CRC check is correct, then illustrates that current sliding window is exactly the frame boundaries of 40ms, and obtain system-frame according to the content of broadcast channel
Number and bandwidth information and physical mixed automatic re-transmission indicating channel configuration.
As a preferred technical solution, in step (4), the method for parsing control format instruction channel are as follows:
First parsing control format indicates channel, which is located in the time domain in the 1st symbol, the position on frequency domain according to
PCI and system bandwidth are calculated, and the information of control format instruction channel bearing is used to divide control signaling area in each subframe
With the boundary of data area, control channel occupied symbolic number in a subframe is obtained by parsing the channel.
As a preferred technical solution, in step (5), decoding data is descrambled using SI-RNTI value method are as follows:
Control channel carrying control information DCI includes: the scheduling of the scheduling information of downlink data transmission, transmitting uplink data
The ACK/NACK of imparting, power control command and uplink data sending；The channel occupies symbol numbers by step 4 in the time domain
It obtains, whole system bandwidth is taken on frequency domain, since control channel transformat has 4 kinds of degree of polymerization, and the DCI of system message
Format has 2 kinds, carries out blind Detecting to 4 kinds of degree of polymerization of every kind of DCI format, is descrambled after decoding using SI-RNTI value, passed through
CRC check then illustrates that current DCI format is Target cell, parses DCI format content, obtains the scheduling information of shared channel.
As a preferred technical solution, in step (6), the shared channel is the data information of carrying transmission, including is
System message, paging message, user data information, shared channel occupy symbol all behind control channel symbol in the time domain,
Specific position is obtained according to scheduling information on frequency domain, shared channel is parsed, obtains cell system message, complete the search of cell
Work.
Compared with the prior art, the invention has the following advantages and beneficial effects:
LTE multi-cell search method provided by the invention, it is only necessary to when handling primary synchronization signal and secondary synchronization signal, obtain
Multiple candidate PCI and corresponding synchronous point are taken, each respective cell PCI information is then successively handled, can complete to multiple
The search of cell.In certain particular applications, when needing to simultaneously scan for multiple cells, synchronization of the existing method to each cell
Individually logical processing primary synchronization signal and secondary synchronization signal are required with search to find PCI and corresponding synchronous point, to the meter of system
Calculation resource requirement is very high, and implementation complexity is big, and the present invention is directed to these disadvantages, improves system processing speed and processing significantly
Timeliness.
Detailed description of the invention
Fig. 1 provides the LTE process flow diagram for searching for multiple cell method for the present invention.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment
As shown in Figure 1, the method for the present embodiment search LTE multiple cell, includes the following steps:
1. first processing primary synchronization signal, primary synchronization signal is made of 3 groups of Zadoff-Chu sequences.Primary synchronization signal time domain
On transmitted on last 1 symbol of the 1st time slot of subframe 0 and subframe 5, or on the 3rd symbol of subframe 1 and subframe 6
It transmits, intermediate 72 subcarriers is occupied on frequency domain.It, can be from data of eating dishes without rice or wine according to the fixation position of primary synchronization signal in the time domain
Then middle extraction primary synchronization signal carries out related operation with local ZC sequence, calculate correlation peak.In order to reduce algorithm complexity
Degree and operand, related operation of the present invention use fast FFT algorithm, and the data that will first eat dishes without rice or wine and local sequence are converted to frequency domain
Then data carry out conjugate multiplication, be finally translated into time domain data, as related operation value.Then compare the relevant peaks of calculating
Value and local threshold value, the correlation peak saved more than threshold value correspond to synchronous point and local ZC sequence number, number as small
ID number in district's groups.ID number in the available 5ms synchronous point of primary synchronization signal and cell group is handled；
2. handling secondary synchronization signal according to the synchronous point that step 1 is calculated.Secondary synchronization signal is made of m-sequence, is shared
168 kinds of combinations.It is transmitted on the second-to-last symbol of the 1st time slot of subframe 0 and subframe 5 in secondary synchronization signal time domain, or
It is transmitted on last 1 symbol of subframe 0 and subframe 5, intermediate 72 subcarriers is occupied on frequency domain.Because between secondary synchronization signal
Cross correlation it is poor, cannot be using the secondary synchronization signal that extracts and local to generate secondary synchronization signal directly related.Usually press
Gradually descramble according to the generating mode of sequence, is finally made decisions using the correlation of m-sequence.The present invention uses noncoherent detection method
The detection for carrying out secondary synchronization signal, can effectively promote the verification and measurement ratio of cell ID in the case of low signal-to-noise ratio.Auxiliary synchronous letter is handled
One group of the corresponding 168 kinds of m-sequences of number available each synchronous point, ID in the cell group then obtained according to step 1 can be with
Obtain corresponding PCI value and frame synchronization point, the parameters such as cyclic prefix configuration and dual-mode；
Secondary synchronization signal, processing method are handled using noncoherent detection method are as follows:
(2-1) extracts secondary synchronization signal according to prefix types in the time domain；
(2-2) carries out FFT transform and obtains frequency-region signal；
(2-3) carries out descrambling operation to frequency domain data using fixed sequence；
(2-4) carries out multiply-accumulate calculating using the data and fixed sequence obtained after descrambling operation, obtains relevant peaks
Value judges that peak value whether greater than thresholding, is frame synchronization point if it is greater than then corresponding synchronous point, completes the inspection of secondary synchronization signal
It surveys.
3. passing through the available PCI Candidate Set of step 2, the corresponding cell of each PCI is next right in sequence
Each PCI in Candidate Set is handled, and physical channel is parsed.Data of eating dishes without rice or wine are found according to the corresponding synchronous point of PCI first to rise
Initial point parses Physical Broadcast Channel.Broadcast channel repeats transmission 4 times in 40ms, and the 1st son of each radio frames is located in time domain
On preceding 4 symbols of 2nd time slot of frame, it is located in the middle on frequency domain on 72 subcarriers.Using sliding window method to broadcast channel
Blind examination is carried out, until CRC check is correct, then illustrates that current sliding window is exactly the frame boundaries of 40ms, and can be believed according to broadcast
The content in road obtains the configuration of System Frame Number and bandwidth information and physical mixed automatic re-transmission indicating channel；
4. as shown, to complete the search of cell, it is also necessary to which the system message for parsing cell obtains matching substantially for cell
Confidence breath, that is, need to parse shared channel.Parsing control format indicates that channel, the channel are located at the 1st symbol in the time domain first
In number, the position on frequency domain can be calculated according to PCI and system bandwidth.Control format indicates the information of channel bearing very
It is important, for dividing the boundary in control signaling area and data area in each subframe, by parsing the available control of the channel
Channel occupied symbolic number in a subframe；
5. parsing control channel according to the control channel symbol numbers that step 4 obtains.Control channel carrying control information
DCI specifically include that the scheduling information of downlink data transmission, the scheduling imparting of transmitting uplink data and power control command and on
Row sends the ACK/NACK of data；The channel occupies symbol numbers in the time domain and is obtained by step 4, and whole system is taken on frequency domain
Bandwidth.Since control channel transformat has 4 kinds of degree of polymerization, and the DCI format of system message has 2 kinds, actually at us
It can only be carried out with the mode of blind examination during reason, blind Detecting is carried out to 4 kinds of degree of polymerization of every kind of DCI format, SI- is utilized after decoding
RNTI value is descrambled, and by CRC check, then illustrates that current DCI format is Target cell, parses DCI format content, is obtained
The scheduling information of shared channel；
6. parsing shared channel according to the shared channel scheduling information that step 4 obtains.Shared channel mainly carries transmission
Data information, including system message, paging message, the information such as user data.Shared channel occupies control channel symbol in the time domain
All symbol number below obtains specific position according to scheduling information on frequency domain.Shared channel is parsed, cell system is obtained and disappears
Breath, completes the search work of cell；
7. the synchronization and search work of all respective cells PCI in Candidate Set can be completed by repeating above step 3 to 6.
It is applied to simultaneously scan for multiple cells present invention is generally directed to LTE system and the implementation of multiple cells is listened to
Occasion propose, if the search arithmetic amount that complete multiple cell is very big, to system using conventional cell search scheme
Processing capacity requires height, and macrooperation amount will lead to real-time decline simultaneously, and high to synchronized algorithm performance requirement, and the present invention mentions
A kind of method of the multiple cells of fast search LTE system out, it is only necessary to handle a primary synchronization signal and secondary synchronization signal, just can
Obtain multiple candidates physical area ID number and corresponding synchronous point, then handled for each physical area ID number,
Just the synchronization of multiple cells can be completed.Operand of the present invention is low, handles simple and convenient.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (8)
1. a kind of method for searching for LTE multiple cell, which is characterized in that include the following steps:
(1) processing primary synchronization signal obtain cell group in ID number and corresponding synchronous point, in LTE system primary synchronization signal by
Multiple groups ZC Sequence composition, every group of ZC sequence correspond to ID number in a cell group, since ZC sequence has good correlation, directly
The data of eating dishes without rice or wine of acquisition are subjected to operation with local ZC sequence and obtain ID number and corresponding synchronous point in cell group；
(2) according to ID number in the synchronous point of step (1) acquisition and corresponding group, secondary synchronization signal is handled, secondary synchronization signal is by m sequence
Column are constituted, and are shared 168 kinds of combinations, are gradually descrambled according to the generating mode of sequence, finally sentenced using the correlation of m-sequence
Certainly, and using noncoherent detection method the detection for carrying out secondary synchronization signal, obtains the one of the corresponding 168 kinds of m-sequences of each synchronous point
Group obtains corresponding PCI value, frame synchronization point, cyclic prefix configuration and dual-mode parameter then according to ID in cell group；
(3) PCI, frame synchronization point, cyclic prefix configuration and the dual-mode of multiple candidate cells are obtained according to step (2), then
Each PCI is handled in sequence, first parsing broadcast channel, obtain downlink bandwidth, System Frame Number parameter；
(4) parameter obtained according to the broadcast channel of step (3) parsing, parsing control format indicate channel, obtain control channel
Symbol numbers；
(5) control channel is parsed according to the symbol numbers that step (4) obtain, control channel is scrambled by S-RNTI, is utilized
SI-RNTI value descrambles decoding data, obtains DCI content；
(6) the DCI content obtained according to step (5) parses shared channel, obtains the system message of cell, complete a candidate
The search of PCI；
(7) multiple candidate PCI are successively handled, the system parameter of each respective cell PCI is obtained, multiple cells are searched in completion
Rope.
2. searching for the method for LTE multiple cell according to claim 1, which is characterized in that in step (1), calculated using quick FFT
By eat dishes without rice or wine data and the progress operation of local ZC sequence of acquisition, the data that will first eat dishes without rice or wine and local sequence go to frequency domain, are conjugated phase method
Multiply and then return again to time domain, if the peak value calculated is greater than setting threshold value, so that it may determine in cell group ID number and corresponding same
Beans-and bullets shooter.
3. searching for the method for LTE multiple cell according to claim 1, which is characterized in that in step (2), before different
The position for sewing type-collection synchronization signal does multiply-accumulate calculating with fixed m-sequence, peak value is calculated, then judges peak
Whether value is greater than thresholding, if it is greater than thresholding then available current synchronous point and No. PCI.
4. searching for the method for LTE multiple cell according to claim 1, which is characterized in that in step (2), in step (2), adopt
Secondary synchronization signal, processing method are handled with noncoherent detection method are as follows:
(2-1) extracts secondary synchronization signal according to prefix types in the time domain；
(2-2) carries out FFT transform and obtains frequency-region signal；
(2-3) carries out descrambling operation to frequency domain data using fixed sequence；
(2-4) carries out multiply-accumulate calculating using the data and fixed sequence obtained after descrambling operation, obtains correlation peak, sentences
Whether disconnected peak value is frame synchronization point if it is greater than then corresponding synchronous point, completes the detection of secondary synchronization signal greater than thresholding.
5. searching for the method for LTE multiple cell according to claim 1, which is characterized in that in step (3), parse broadcast channel
Method are as follows:
Broadcast channel repeats transmission 4 times in 40ms, positioned at preceding the 4 of the 2nd time slot of the 1st subframe of each radio frames in time domain
It is located in the middle on a symbol, on frequency domain on 72 subcarriers, blind examination is carried out to broadcast channel using sliding window method, until CRC is examined
Test correct, then illustrate that current sliding window is exactly the frame boundaries of 40ms, and according to the content of broadcast channel obtain System Frame Number and
The configuration of bandwidth information and physical mixed automatic re-transmission indicating channel.
6. searching for the method for LTE multiple cell according to claim 1, which is characterized in that in step (4), parse control format
The method for indicating channel are as follows:
First parsing control format indicates that channel, the channel are located in the time domain in the 1st symbol, and the position on frequency domain is according to PCI
It is calculated with system bandwidth, the information of control format instruction channel bearing is used to divide control signaling area sum number in each subframe
According to the boundary in region, control channel occupied symbolic number in a subframe is obtained by parsing the channel.
7. searching for the method for LTE multiple cell according to claim 1, which is characterized in that in step (5), utilize SI-RNTI value
The method that decoding data is descrambled are as follows:
Control channel carrying control information DCI includes: that the scheduling of the scheduling information of downlink data transmission, transmitting uplink data is assigned
It gives, the ACK/NACK of power control command and uplink data sending；The channel occupies symbol numbers in the time domain and is obtained by step 4
, whole system bandwidth is taken on frequency domain, since control channel transformat has 4 kinds of degree of polymerization, and the DCI lattice of system message
Formula has 2 kinds, carries out blind Detecting to 4 kinds of degree of polymerization of every kind of DCI format, is descrambled after decoding using SI-RNTI value, passed through
CRC check then illustrates that current DCI format is Target cell, parses DCI format content, obtains the scheduling information of shared channel.
8. searching for the method for LTE multiple cell according to claim 1, which is characterized in that in step (6), the shared channel
It is the data information of carrying transmission, including system message, paging message, user data information, shared channel occupies in the time domain
All symbols behind control channel symbol obtain specific position according to scheduling information on frequency domain, parse shared channel, obtain
Cell system message completes the search work of cell.
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| CN110995628B (en) * | 2019-12-10 | 2022-08-02 | 上海创远仪器技术股份有限公司 | Method for analyzing and processing LTE-A system message in mobile communication system |
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