CN106332112A - Method for implementing synchronization and tracking of LTE-advanced heterogeneous wireless communication network test platform - Google Patents
Method for implementing synchronization and tracking of LTE-advanced heterogeneous wireless communication network test platform Download PDFInfo
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- CN106332112A CN106332112A CN201610982745.1A CN201610982745A CN106332112A CN 106332112 A CN106332112 A CN 106332112A CN 201610982745 A CN201610982745 A CN 201610982745A CN 106332112 A CN106332112 A CN 106332112A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0605—Special codes used as synchronising signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0614—Systems characterised by the synchronising information used the synchronising signal being characterised by the amplitude, duration or polarity
Abstract
The invention discloses a method for implementing synchronization and tracking of transmitting and receiving terminals of an LTE-advanced heterogeneous wireless communication technology test platform; both the transmitting and receiving ends of the LET-advanced heterogeneous wireless communication network test platform operate based on external event triggering; upon triggering by an external event, the transmitting terminal switches among a non-start state, a transmitting state and a waiting state; the receiving terminal switches among a non-synchronous state, an intermediate sate, a synchronous state and a non-start state; the method synchronizes the receiving and transmitting terminals through main and auxiliary synchronous signals included in LTE-advanced wireless frames, while synchronous tracking is provided; the method ensures that when the test platform experiences time domain and frequency domain deviation, the transmitting terminal and the receiving terminal switch to the non-synchronous state in time, then transmit signals and notify synchronization loss of a network upper layer; after synchronization loss, the method enables the transmitting and receiving terminals of the LET-advanced heterogeneous wireless communication network test platform to switch again to the synchronous state through time domain correction and frequency domain correction.
Description
Technical field
The present invention relates to communication technical field.
Background technology
The LTE-Advanced that International Organization for Standardization 3GPP proposes is new generation of wireless communication technology standard.The most no matter
It is scientific research institutions, institution of higher learning or wireless communication arena, all use the mode of software radio to build heterogeneous wireless communication net
Network technical testing platform.Utilize test platform that all kinds of wireless communication technologys in LTE-Advanced are designed, test and
Checking.In test platform, the transmitting-receiving between wireless receiving end and transmitting terminal is Tong Bu the basis that test platform normally works.?
In LTE-Advanced radio communication specification, the techniqueflow synchronized is not made concrete regulation.Specification specify only same
Step signal generates requirement, and the mapping mode that synchronizing signal is in LTE radio frames.
Summary of the invention
The present invention proposes the heterogeneous wireless communication networks technical testing platform of a kind of LTE-Advanced of meeting specification and connects
Receiving end implementation method with tracking Tong Bu with transmitting terminal.
Firstly generate data to be sent, cell special reference CRS (Cell-specific Reference
Signal), master sync signal PSS (Primary Synchronization Signal) and auxiliary synchronous signals SSS
(Secondary Synchronization Signal)；Then data to be sent are modulated, system are adopted realizing
By QPSK (Quadrature Phase Shift Keying) modulation system；Regulation is mapped then according to LTE radio frames resource,
Generate LTE radio frames；Radio frames is carried out IFFT conversion, then cyclic prefix CP (Cyclic Prefix) is inserted into be sent
The front portion of data, generates OFDM (Orthogonal Frequency Division Multiplexing) symbol；Finally utilize
The radio frames of generation is launched by USRP Tx the most one by one.
Radio frames is received by receiving terminal USRP, first carries out frequency offset correction, and the size of frequency deviation value is calculated by frequency deviation value
Module is calculated；Frequency deviation value freq_offset feeds back to frequency offset correction module in message_passing mode, it is achieved right
Receive the frequency offset correction of data.
Then it is circulated prefix CP location, obtains CP positional information.
CP positional information, on the one hand for frequency offset calculation, is on the other hand used for CP.
Removing after CP, by FFT by data by spatial transform to frequency domain.
Realize transmitting terminal receiving terminal followed by master sync signal PSS and auxiliary synchronous signals SSS to synchronize.
Utilize cell special reference CRS to realize channel to estimate.
Result that channel the estimates data to receiving are utilized to carry out the compensation of amplitude and phase place.
After achieving reception data amplitude and phase compensation, make decisions, by court verdict with one receiving data
Fixed data form is exported.
The field sync between receiving terminal and transmitting terminal is realized first with master sync signal.
The master sync signal PSS that receive 70 OFDM symbol generate with receiving terminal this locality one by one is carried out related calculation,
Obtain 70 correlations.
The OFDM symbol that maximum related value is corresponding comprises PSS signal.
Therefore, the OFDM symbol that maximum related value is corresponding should numbered 6 in these half frame data.
But, owing to 70 OFDM symbol received are not exactly half radio frames.
Therefore, 76 reference field OFDM symbol numbered actual OFDM symbol numbering is deducted.
Through the process of master sync signal locating module find_pss, receiving terminal located master sync signal PSS.
From the beginning of next field, the OFDM symbol numbering that output is actual, it is achieved that field sync.
The sign synchronization between receiving terminal and transmitting terminal is realized followed by auxiliary synchronous signals.
The implication of sign synchronization refers to that 140 OFDM symbol in each radio frames can just carried out by wireless receiving end
True numbering, Serial Number Range is 1 ~ 140.
Utilize the result of master sync signal locating module find_pss, by receive numbered 5 OFDM symbol
Auxiliary synchronous signals SSS_sub0 and SSS_sub5 being from a locally generated does relevant respectively, and correlation is respectively stored into Corr_f_0
With in Corr_f_5.
If Corr_f_0 > Corr_f_5, illustrate that field residing for previous OFDM symbol is front field, by find_pss module
Output numbering directly export；If Corr_f_0 < Corr_f_5, illustrate that field residing for previous OFDM symbol is rear field, will
Output numbering exports after carrying out field displacement.
So far, after have passed through the process in succession of two modules of find_pss and find_sss, it is achieved that LTE receiving terminal
Sign synchronization with transmitting terminal.
PSS/SSS sequence is relevant to physical-layer cell ID, for the wireless terminal identification to community.
Master sync signal PSS sequence has three kinds, ID-QUOTE in the group of indicating cell , QUOTE
Value have 0,1,2 three kind may.
Auxiliary synchronous signals SSS sequence has 168 kinds, the group ID-QUOTE of indicating cell , QUOTE
Value be 0 ~ 167.
In FDD Type 1 frame structure, PSS/SSS signal is positioned in the 0th subframe and the 5th subframe, and is positioned at two
In continuous print OFDM symbol.
Utilize half frame data (70 OFDM symbol) received, three these 70 OFDM symbol be from a locally generated one by one
Plant master sync signal sequence and do relevant, produce 210 correlations, compare the size of correlation.
If maximum related value produces in front 70 correlations, then ID-QUOTE in the group of community It is 0；If
Big correlation produces in the correlation of 70, middle part, then ID-QUOTE in the group of community It is 1；If maximum related value exists
Rear 70 correlations produce, then ID-QUOTE in the group of community It is 2.
By said process, the value of ID in the group of community can be obtained.
After find_pss resume module, system achieves field sync, it is possible to enter the OFDM symbol received
Line number, Serial Number Range is 1 ~ 70.
Meanwhile, it is achieved that the location to the master sync signal that reference field data are comprised.
As shown in Figure 4, comprise the OFDM symbol numbered 6 of master sync signal PSS, and PSS/SSS signal is positioned at two companies
In continuous OFDM symbol.
Therefore, numbered the 5 of auxiliary synchronous signals SSS.
OFDM symbol by receive numbered 5 generates 168 kinds of auxiliary synchronous signals sequences to receiving terminal this locality and does relevant,
Obtain 168 correlations.
The relatively size of correlation, which correlation maximum explanation current number be 5 OFDM symbol in comprise auxiliary
Any identical with 168 kinds of auxiliary synchronous signals sequences of synchronizing signal.
Can obtain the value of community group ID, span is 0 ~ 167.
After obtaining the value of group NeiIDHe community, community group ID, physical-layer cell ID-can be calculated
QUOTE 。
So far primary/secondary synchronizing signal is utilized to complete the identification of wireless receiving Duan Dui community.
The inventive method utilize be included in LTE-Advanced radio frames main and auxiliary help synchronizing signal realize receiving terminal and
The synchronization of transmitting terminal, and possess synchronized tracking function.Method is able to ensure that test platform, when there is time domain and frequency domain deviation, is sent out
Sending end and receiving terminal proceed to asynchronous regime in time, then send signal, point out upper network layer synchronization loss.Synchronization loss it
After, this method can make sending out of LTE-Advanced heterogeneous wireless communication networks test platform by time domain correlation and frequency-domain correction
Sending end and receiving terminal are again introduced into synchronous regime.
Accompanying drawing explanation
Fig. 1 is GNU Radio programming structure schematic diagram；
Fig. 2 is transmitting terminal signal processing flow；
Fig. 3 is receiving end signal process chart；
Fig. 4 is LTE FDD Type1 frame structure schematic diagram；
Fig. 5 is synchronization program flow chart；
Fig. 6 is that physical-layer cell ID resolves flow chart.
Detailed description of the invention
Test platform transmitting terminal signal processing flow is as shown in Figure 2.
Firstly generate data to be sent, cell special reference CRS (Cell-specific Reference
Signal), master sync signal PSS (Primary Synchronization Signal) and auxiliary synchronous signals SSS
(Secondary Synchronization Signal)；Then data to be sent are modulated, system are adopted realizing
By QPSK (Quadrature Phase Shift Keying) modulation system；Regulation is mapped then according to LTE radio frames resource,
Generate LTE radio frames；Radio frames is carried out IFFT conversion, then cyclic prefix CP (Cyclic Prefix) is inserted into be sent
The front portion of data, generates OFDM (Orthogonal Frequency Division Multiplexing) symbol；Finally utilize
The radio frames of generation is launched by USRP Tx the most one by one.
The signal processing flow of test platform receiving terminal is as shown in Figure 3.
Solid line representative of data flow in figure, dotted line representative information stream.
Radio frames is received by receiving terminal USRP, first carries out frequency offset correction, and the size of frequency deviation value is calculated by frequency deviation value
Module is calculated；Frequency deviation value freq_offset feeds back to frequency offset correction module in message_passing mode, it is achieved right
Receive the frequency offset correction of data.
Then it is circulated prefix CP location, obtains CP positional information.
CP positional information, on the one hand for frequency offset calculation, is on the other hand used for CP.
Removing after CP, by FFT by data by spatial transform to frequency domain.
Realize transmitting terminal receiving terminal followed by master sync signal PSS and auxiliary synchronous signals SSS to synchronize.
Utilize cell special reference CRS to realize channel to estimate.
Result that channel the estimates data to receiving are utilized to carry out the compensation of amplitude and phase place.
After achieving reception data amplitude and phase compensation, make decisions, by court verdict with one receiving data
Fixed data form is exported.
As shown in Figure 4, in LTE, a radio frames (frame) comprises 10 subframes (subframe), and numbered 0 to 9；Bag
Containing 20 time slots (slot), numbered 0 ~ 19；Each time slot comprises 7 OFDM symbol (symbol), and numbered 0 ~ 6.
Every frame is made up of 140 OFDM symbol.
Every frame comprises two master sync signals and auxiliary synchronous signals.
In one frame, two PSS are identical；Two SSS differences, the SSS_sub0 of front field is different from the SSS_sub5 of rear field.
SSS_sub0 is the auxiliary synchronous signals in the 0th subframe, and SSS_sub5 is the auxiliary synchronous signals in the 5th subframe.
The field sync between receiving terminal and transmitting terminal is realized first with master sync signal.
The master sync signal PSS that receive 70 OFDM symbol generate with receiving terminal this locality one by one is carried out related calculation,
Obtain 70 correlations.
The OFDM symbol that maximum related value is corresponding comprises PSS signal.
Therefore, the OFDM symbol that maximum related value is corresponding should numbered 6 in these half frame data.
But, owing to 70 OFDM symbol received are not exactly half radio frames.
Therefore, 76 reference field OFDM symbol numbered actual OFDM symbol numbering is deducted.
Through the process of master sync signal locating module find_pss, receiving terminal located master sync signal PSS.
From the beginning of next field, the OFDM symbol numbering that output is actual, it is achieved that field sync.
The sign synchronization between receiving terminal and transmitting terminal is realized followed by auxiliary synchronous signals.
The implication of sign synchronization refers to that 140 OFDM symbol in each radio frames can just carried out by wireless receiving end
True numbering, Serial Number Range is 1 ~ 140.
Utilize the result of master sync signal locating module find_pss, by receive numbered 5 OFDM symbol
Auxiliary synchronous signals SSS_sub0 and SSS_sub5 being from a locally generated does relevant respectively, and correlation is respectively stored into Corr_f_0
With in Corr_f_5.
If Corr_f_0 > Corr_f_5, illustrate that field residing for previous OFDM symbol is front field, by find_pss module
Output numbering directly export；If Corr_f_0 < Corr_f_5, illustrate that field residing for previous OFDM symbol is rear field, will
Output numbering exports after carrying out field displacement.
So far, after have passed through the process in succession of two modules of find_pss and find_sss, it is achieved that LTE receiving terminal
Sign synchronization with transmitting terminal.
PSS/SSS sequence is relevant to physical-layer cell ID, for the wireless terminal identification to community.
Physical-layer cell ID solution process is as shown in Figure 6.
Master sync signal PSS sequence has three kinds, ID-QUOTE in the group of indicating cell , QUOTE Value have 0,1,2 three kind may.
Auxiliary synchronous signals SSS sequence has 168 kinds, the group ID-QUOTE of indicating cell , QUOTE
Value be 0 ~ 167.
In FDD Type 1 frame structure, PSS/SSS signal is positioned in the 0th subframe and the 5th subframe, and is positioned at two
In continuous print OFDM symbol.
Utilize half frame data (70 OFDM symbol) received, three these 70 OFDM symbol be from a locally generated one by one
Plant master sync signal sequence and do relevant, produce 210 correlations, compare the size of correlation.
If maximum related value produces in front 70 correlations, then ID-QUOTE in the group of community It is 0；If
Big correlation produces in the correlation of 70, middle part, then ID-QUOTE in the group of community It is 1；If maximum related value exists
Rear 70 correlations produce, then ID-QUOTE in the group of community It is 2.
By said process, the value of ID in the group of community can be obtained.
After find_pss resume module, system achieves field sync, it is possible to enter the OFDM symbol received
Line number, Serial Number Range is 1 ~ 70.
Meanwhile, it is achieved that the location to the master sync signal that reference field data are comprised.
As shown in Figure 4, comprise the OFDM symbol numbered 6 of master sync signal PSS, and PSS/SSS signal is positioned at two companies
In continuous OFDM symbol.
Therefore, numbered the 5 of auxiliary synchronous signals SSS.
OFDM symbol by receive numbered 5 generates 168 kinds of auxiliary synchronous signals sequences to receiving terminal this locality and does relevant,
Obtain 168 correlations.
The relatively size of correlation, which correlation maximum explanation current number be 5 OFDM symbol in comprise auxiliary
Any identical with 168 kinds of auxiliary synchronous signals sequences of synchronizing signal.
Can obtain the value of community group ID, span is 0 ~ 167.
After obtaining the value of group NeiIDHe community, community group ID, utilize formula (1) that physical layer can be calculated
Community ID-QUOTE 。
QUOTE (1)
So far primary/secondary synchronizing signal is utilized to complete the identification of wireless receiving Duan Dui community.
Claims (1)
1. a LTE-Advanced heterogeneous wireless communication networks test platform synchronizes and follows the tracks of implementation method, it is characterised in that:
Described method comprises the following steps:
Firstly generate data to be sent, cell special reference CRS, master sync signal PSS and auxiliary synchronous signals SSS；Then
Data to be sent are modulated, use QPSK modulation system；Then according to LTE radio frames resource map regulation, generate LTE without
Line frame；Radio frames is carried out IFFT conversion, then cyclic prefix CP is inserted into the front portion of data to be sent, generate OFDM symbol；
USRP Tx is finally utilized the radio frames of generation to be launched the most one by one；
Radio frames is received by receiving terminal USRP, first carries out frequency offset correction, and the size of frequency deviation value is by frequency deviation value computing module
It is calculated；Frequency deviation value freq_offset feeds back to frequency offset correction module in message_passing mode, it is achieved to reception
The frequency offset correction of data；
Then it is circulated prefix CP location, obtains CP positional information；
CP positional information, on the one hand for frequency offset calculation, is on the other hand used for CP；
Removing after CP, by FFT by data by spatial transform to frequency domain；
Realize transmitting terminal receiving terminal followed by master sync signal PSS and auxiliary synchronous signals SSS to synchronize；
Utilize cell special reference CRS to realize channel to estimate；
Result that channel the estimates data to receiving are utilized to carry out the compensation of amplitude and phase place；
After achieving reception data amplitude and phase compensation, make decisions, by court verdict with certain receiving data
Data form is exported；
Master sync signal is utilized to realize the field sync between receiving terminal and transmitting terminal；
The master sync signal PSS that receive 70 OFDM symbol generate with receiving terminal this locality one by one is carried out related calculation, obtains
70 correlations；
The OFDM symbol that maximum related value is corresponding comprises PSS signal；
Therefore, the OFDM symbol that maximum related value is corresponding should numbered 6 in these half frame data；
But, owing to 70 OFDM symbol received are not exactly half radio frames；
Therefore, 76 reference field OFDM symbol numbered actual OFDM symbol numbering is deducted；
Through the process of master sync signal locating module find_pss, receiving terminal located master sync signal PSS；
From the beginning of next field, the OFDM symbol numbering that output is actual, it is achieved that field sync；
The sign synchronization between receiving terminal and transmitting terminal is realized followed by auxiliary synchronous signals；
The implication of sign synchronization refers to that 140 OFDM symbol in each radio frames can be carried out correct by wireless receiving end
Numbering, Serial Number Range is 1 ~ 140；
Utilize the result of master sync signal locating module find_pss, by receive numbered 5 OFDM symbol with this
Ground generate auxiliary synchronous signals SSS_sub0 and SSS_sub5 do relevant respectively, correlation is respectively stored into Corr_f_0 and
In Corr_f_5；
If Corr_f_0 > Corr_f_5, illustrate that field residing for previous OFDM symbol is front field, defeated by find_pss module
Go out numbering directly output；If Corr_f_0 < Corr_f_5, illustrate that field residing for previous OFDM symbol is rear field, will output
Numbering exports after carrying out field displacement；
So far, after have passed through the process in succession of two modules of find_pss and find_sss, it is achieved that LTE receiving terminal with send out
The sign synchronization of sending end；
PSS/SSS sequence is relevant to physical-layer cell ID, for the wireless terminal identification to community；
Master sync signal PSS sequence has three kinds, ID-in the group of indicating cell,Value have 0,1,2 three kind；
Auxiliary synchronous signals SSS sequence has 168 kinds, group ID-of indicating cell,Value be 0 ~ 167；
In FDD Type1 frame structure, PSS/SSS signal is positioned in the 0th subframe and the 5th subframe, and is positioned at two continuously
OFDM symbol in；
Utilizing 70 OFDM symbol of half frame data received, the three kinds of masters these 70 OFDM symbol being from a locally generated one by one are same
Step signal sequence does relevant, produces 210 correlations, compares the size of correlation；
If maximum related value produces in front 70 correlations, then ID-in the group of communityIt is 0；If maximum related value is at middle part 70
Individual correlation produces, then ID-in the group of communityIt is 1；If maximum related value produces in rear 70 correlations, then community group
Interior ID-It is 2；
By said process, the value of ID in the group of community can be obtained；
After find_pss resume module, system achieves field sync, it is possible to compile the OFDM symbol received
Number, Serial Number Range is 1 ~ 70；
Meanwhile, it is achieved that the location to the master sync signal that reference field data are comprised；
Comprise the OFDM symbol numbered 6 of master sync signal PSS, and PSS/SSS signal is positioned in two continuous print OFDM symbol；
Therefore, numbered the 5 of auxiliary synchronous signals SSS；
OFDM symbol by receive numbered 5 generates 168 kinds of auxiliary synchronous signals sequences to receiving terminal this locality and does relevant, obtains
168 correlations；
The relatively size of correlation, which correlation maximum illustrates the auxiliary synchronization comprised in the OFDM symbol that current number is 5
Any identical in signal and 168 kinds of auxiliary synchronous signals sequences；
Can obtain the value of community group ID, span is 0 ~ 167；
After obtaining the value of group NeiIDHe community, community group ID, physical-layer cell ID-can be calculated；
So far primary/secondary synchronizing signal is utilized to complete the identification of wireless receiving Duan Dui community.
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Application publication date: 20170111 |