CN103889069B - A kind of accidental access signal method of sending and receiving applied to large coverage - Google Patents
A kind of accidental access signal method of sending and receiving applied to large coverage Download PDFInfo
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Abstract
The present invention provides a kind of accidental access signal method of sending and receiving applied to large coverage, step：User device configuration RACH forms, RACH forms are set by CP length includes M repetition 24576Ts, TSEQLength is arranged to N number of and repeats 24576Ts, M=1, N >=1；R is covering scene radius, and C is the light velocity, Ts=1/ (15000*2048) s；Its protection interval of length adjustment GT is taken by RACH and is extremely more than or equal to trip path time delay；RACH signals after send configuration, base station extract the peakvalue's checking sequence of N+2 24576Ts length；N+2 section peakvalue's checking sequences are subjected to peakvalue's checking respectively；Bias when the leading ID results and SINR cascading judgement detected side by side to every section obtains initial；Situation about occurring by judging same leading ID in N+1 parallel detection window, to it is initial when bias carry out calibration obtain correctly leading ID and when bias；Using achievable more than the 100KM of the present invention a wide range of covering, the requirement of the timing accuracy under super remote covering is disclosure satisfy that, saves running time-frequency resource, it is smaller to protocol modification.
Description
Technical field
The present invention relates to GSM FDD Long Term Evolution（FDD-LTE）Field, more particularly to one kind are covered greatly
Accidental access signal method of sending and receiving under lid, the invention belongs to the communications field.
Background technology
In LTE-FDD systems, user equipment establishes up initial synchronisation, user equipment by random access procedure and base station
Initial timing lead（TA）Reported by RACH measurement, accordingly, it is capable to which no correctly estimate TA, to user equipment
Uplink transmission time synchronization can be obtained, and can carry out uplink by correct scheduling below to have important influence.
LTE-FDD systems RACH at present（RACH）Leading form have 4 kinds, every kind of form has respective follow
Ring prefix（CP）And sequence（TSEQ）Length, and different CP and TSEQLength have reachable radius of society corresponding to it and
Time delay range.In these the leading forms designed, the CP a length of 21024Ts, T of leading form 3SEQIt is to be grown by two 24576Ts
Repetitive sequence composition, using legacy preamble detection method, the maximum delay that the form can be supported be 24576Ts, correspondence 100KM
The covering radius of left and right, be not suitable for being used for the special screne that radius exceedes 100KM on the premise of base station equipment is not increased,
Under more than 100KM special screne, using existing leading form and its traditional detection algorithm, TA can be caused to estimate mistake,
The success rate of user equipment acquirement uplink synchronous will be influenceed.
In order to cover bigger scope, traditional sending method needs to configure the corresponding CP of RACH and protection by covering demand
Interval（GT）Length offsets round-trip delay, i.e. cell coverage area is bigger, propagation delay time it is longer, it is necessary to CP and GT it is bigger,
Increase RACH T is also needed simultaneouslySEQLength and frequency domain bandwidth so that RACH meets the timing accuracy demand of system, causes time-frequency to provide
The waste in source.
The content of the invention
It is an object of the invention to provide it is a kind of improve covering power random signal access method of sending and receiving, so as to
While expanding the coverage area, system time frequency resource is saved.
The technical solution adopted in the present invention is：
A kind of accidental access signal method of sending and receiving applied to large coverage, comprise the following steps：User sets
Standby allocating random access channel RACH forms, the CP length of RACH forms, which is set, includes M 24576Ts, T repeatedSEQLength is set
It is set to the 24576Ts of N number of repetition, wherein M=1, N >=1；N is by formulaR is covering field
Scape radius, C are the light velocity, Ts=1/(15000*2048) sObtain；The protection interval GT of length adjustment RACH signals is taken extremely by RACH signals
More than or equal to trip path time delay；For RACH signals after user's setting send configuration to base station, base station extracts N+2
The peakvalue's checking sequence of 24576Ts length；N+2 section peakvalue's checking sequences are subjected to peakvalue's checking respectively；Every section is detected side by side
Bias when leading ID results and SINR cascading judgement obtain initial；By judging same leading ID in N+1 parallel inspections
Survey situation about occurring in window, to it is initial when bias carry out calibration obtain correctly leading ID and when bias, accidental access signal connects
Harvest work(.
The peakvalue's checking sequential extraction procedures process is：From the beginning the sequence extracted is divided according to this backward with 24576Ts length
For the 1st section, the 2nd section ... the section sequence of N+2 sections, parallel peakvalue's checking is carried out respectively to section sequence, records every section of peakvalue's checking
Targeting sequencing ID and time offset result and N+1 sections and N+2 sections detection window in SINR.
It is as follows to obtain process for bias when described initial：The testing result of the N+2 sections in section sequence is removed, when N+1 sections
And at least one section in remaining N sections detects same preamble ID, then using N+1 section sequence estimations when bias as it is initial when
Bias；The testing result of the N+2 sections in section sequence is removed, occurs when same leading ID in N+1 sections, then compares N+1
The SINR of section and N+2 sections, take that section of big sequence estimation of SINR come out when bias as it is initial when bias.
The N+2 sections peakvalue's checking sequence carries out peak-value detection method respectively：Every section of peakvalue's checking sequence frequency displacement is arrived
At DC, sequence is filtered and down-sampling, obtains the sequence that length is 2048Ts, carry out 2048 point quick Fourier conversion,
839 point original ZC sequences are therefrom extracted, locally the frequency domain sequence of female code is total to the multiple of RACH frequency domain sequences received with ZC sequences
Yoke is multiplied, and carries out 1536 points of inverse discrete Fourier transform, obtains PDP time domain correlations；PDP time delay correlations are taken into average,
The setting of threshold value and the detection of peak value are carried out according to PDP averages, records the every section of targeting sequencing detected ID and corresponding
When bias, calculate obtain SINR.
Calibration includes three kinds of modes partially when described：I）The testing result of N+2 sections is removed, when same leading ID is in preceding N+
When all occurring in 1 parallel peakvalue's checking, bias is not required to calibrate when initial, when will be initial bias as finally report when it is inclined
Value；II）The testing result of N+2 sections is removed, when same leading ID is in 1...M（M=1...N）Do not go out in individual peakvalue's checking
Existing, and when occurring in remaining N+1-M peakvalue's checking, bias obtains calibration value plus M*24576Ts when will be initial, high-ranking officers
Quasi- value is as the when bias finally reported；III）The testing result of N+2 sections is removed, when same leading ID is in N+1 peak value
When all not occurring in detection, time delay is excessive to be caused random access failure or does not send out the leading ID.The SINR value is detection window
In PDP peak energies and total PDP energy ratios.The PDP peak energies are that PDP peak maximums energy is attached plus peak value
The energy of near point.
The invention has the advantages that：
In order to be successfully accessed under more than 100KM big covering scene, the present invention provides a kind of suitable for more than 100KM's
Big covering accidental access method, this method do not change the frequency domain resource of RACH occupancy, and required increased extra time-domain resource is smaller,
Systematic function is can guarantee that simultaneously, is saved system resource, is reduced expense.
Brief description of the drawings
Fig. 1 is the RACH preamble structure schematic diagrames that the present invention designs；
Fig. 2 is RACH peakvalue's checkings sequential extraction procedures schematic diagram of the present invention；
Fig. 3 is the implementation process figure of RACH sending methods of the present invention；
Fig. 4 is the base station side RACH overhaul flow charts of the present invention；
Fig. 5 is base station side RACH detection part flow charts of the present invention；
Fig. 6 is the structural representation that RACH is leading in the embodiment of the present invention 1；
Fig. 7 is RACH peakvalue's checking sequential extraction procedures schematic diagrames in the embodiment of the present invention 1；
Fig. 8 is the structural representation that RACH is leading in the embodiment of the present invention 2；
Fig. 9 is RACH peakvalue's checking sequential extraction procedures schematic diagrames in the embodiment of the present invention 2；
Embodiment
With reference to each embodiment, to the main realization principle of the present invention, embodiment and its can reach
Beneficial effect is described in detail.
A kind of accidental access signal method of sending and receiving applied to large coverage involved in the present invention, including it is as follows
Step：User device configuration RACH RACH forms, as shown in figure 1, the CP length of RACH forms, which is set, includes M weight
Multiple 24576Ts, TSEQLength is arranged to the 24576Ts of N number of repetition, wherein M=1, N >=1；N is by formulaR is covering scene radius, and C is the light velocity, Ts=1/(15000*2048)sObtain；Believed by RACH
Number the protection interval GT of length adjustment RACH signals is taken to being more than or equal to trip path time delay；After user sets send configuration
RACH signals to base station, base station extracts the peakvalue's checking sequence of N+2 24576Ts length；By N+2 section peakvalue's checkings sequence point
Peakvalue's checking is not carried out；Bias when the leading ID results and SINR cascading judgement detected side by side to every section obtains initial；It is logical
Cross the situation for judging that same leading ID occurs in N+1 parallel detection window, to it is initial when bias carry out calibration obtain it is correct
Leading ID and when bias, accidental access signal receives successfully.
The embodiment of the present invention is described in detail for being covered within more than 100KM and 100KM respectively, embodiment 1 and reality
The citing that example 2 is more than 100KM coverages is applied, respectively for 200KM and 360KM coverage conditions, embodiment 3 is that 100KM covers
Lid citing.
The embodiment of the present invention 1：
In the case where not changing LTERACH frequency domain resources, to cover 200KM cells as embodiment, to the hair of the present invention
Delivery method and method of reseptance are illustrated.
The present embodiment totally 3 users, under low speed scene, the random access guiding ID number of transmission is respectively 0,1,2, Ncs=0,
The path delay of time of each user is respectively 1000Ts in embodiment（Within 100KM）, 35000Ts（Within 100~200KM）,
50000Ts（More than 200KM）.
The sending method of the embodiment of the present invention 1 is described in detail 2 and Fig. 3 below in conjunction with the accompanying drawings, sending method include with
Lower step：
Step 201, user equipment configures RACH as follows；
In the case where not changing frequency domain resource, 200KM cell is now covered, sending method of the invention is：It is first
N size is first calculated, now R=200KM, according to N calculation formula Obtain N=1, TSEQ
Length is 24576Ts, and CP length is 24576Ts, and trip path time delay reaches 1.34ms, and protection interval GT length takes 1.34ms,
Then total length is 2*24576Ts+1.34ms=1.6ms+1.34ms=2.94ms under RACH, 3 TTI is only needed altogether, due to total
3 TTI are taken altogether, therefore are 1.4ms by GT length adjustments.GT is conventionally designed, that is, after calculating round-trip delay, GT
Can suitably it be tuned up according to the length that RACH signals take, protection interval GT is more than or equal to maximum round trip time delay.
The RACH preamble structures schematic diagram that 200KM is covered in the embodiment of the present invention is as shown in fig. 6, using transmission of the invention
And method of reseptance, required running time-frequency resource expense and the existing leading forms 3 of LTE are identical, and leading form 3 is provided inside agreement
A kind of maximum RACH forms of coverage, its coverage be 100KM, and method of sending and receiving of the invention can cover
200KM is covered, running time-frequency resource has effectively been saved, has expanded the coverage of system；Meanwhile this leading form is in time domain
RACH signals are changed, frequency domain keeps constant, smaller to protocol change, and change is got up convenient, it is easy to accomplish.
Particularly, can connecing without using the present invention if the leading form in the present embodiment need to only cover 100KM scopes
Receiving method, using traditional method of reseptance, and the running time-frequency resource expense of existing leading form 3 needs and overlayable model
Enclose identical.
Step 202, it is leading to obtain new RACH, and RACH signals are sent according to RACH configuration modes.
The method of reseptance that 4 pairs of embodiment of the present invention 1 improve covering power below in conjunction with the accompanying drawings is described in detail, and connects at random
Enter signal acceptance method to comprise the following steps：
Step 401, peakvalue's checking sequential extraction procedures：Base station side receives accidental access signal, is obtained according to leading configuration index
Leading time-domain position, extract being total to including CP and sequence and part GT（N+2）* the data of 24576Ts length, due to
N=1 in the present embodiment, then the sequence of 3 24576Ts length is extracted, data are divided into 3 sections according to this from front to back, such as Fig. 7 institutes
Show；
Step 402, peak value parallel detection is carried out：3 peakvalue's checking sequences are subjected to parallel peakvalue's checking respectively.Record
Every section of targeting sequencing ID detected, when deviator and power-delay spectrum（PDP）Signal to noise ratio（SINR）.
Step 402 is described in detail the present embodiment combination Fig. 5：
Step 501, when carrying out peakvalue's checking to each sequence, by every section of peakvalue's checking sequence frequency displacement to direct current（DC）Place,
Sequence is filtered and 12 times of down-sampling, obtains the sequence that length is 2048Ts, carry out 2048 point quick Fourier conversion
（FFT）, therefrom extract 839 point original Zadoff-Chu（ZC）Sequence, with the locally frequency domain sequence of female code and the reception of ZC sequences
The complex conjugate multiplication of RACH frequency domain sequences, carry out 1536 points of inverse discrete Fourier transform（IDFT）, obtain PDP time domains correlation
Value.
Step 502, PDP is averaged, the setting of threshold value and the detection of peak value, traversal 64 is carried out according to PDP averages
Individual root sequence, the leading ID and time offset of user are detected, calculate the SINR value for the N+1 and N+2 sections for obtaining detection window.According to
Correlation method estimating time bias method comparative maturity, does not do excessive elaboration herein.The SINR for obtaining peakvalue's checking is calculated in this step
For the PDP peak energies in detection window and total PDP energy ratios.PDP peak energies are that PDP peak maximums energy adds peak
If the energy done near value, the energy of 6 points near peak value can be selected in the present invention, because 839 point ZC sequences pass through
Cross K points（Such as K=1536）Impact broadening causes energy to be scattered when IDFT calculates PDP.
Step 403, it is inclined when obtaining initial：Pass through the leading ID results and SINR cascading judgement to every section of parallel detection
Bias when obtaining initial.The 3rd section of testing result is not considered first：If same leading ID is more than detecting at the 2nd section, i.e.,
All detected at the 1st and the 2nd section, then using the 2nd section estimation when bias as it is initial when bias；If same leading ID only exists
2nd section of appearance, then compare the SINR of 2 sections and 3 sections, take that section of big sequence estimation of SINR out when bias as it is initial when it is inclined
Value；If same leading ID does not occur in the 1st section and the 2nd section, it is believed that the not user.
Totally 3 users are respectively 1000Ts in the path delay of time to the present embodiment（Within 100KM）, 35000Ts（100~200KM with
It is interior）, 50000Ts（More than 200KM）.As shown in fig. 6, user 1（Time delay is 1000Ts）Fall [0~24576）In Ts, the 1st
All detected with the 2nd section, using the 2nd section estimation when bias as it is initial when bias, when bias be 1000Ts；User 2（Time delay is
35000Ts）Fall in [24576Ts~2*24576）In Ts, only all detected at the 2nd section, compare the SINR of 2 sections and 3 sections, the 3rd section
SINR it is big, take the 3rd section estimate when bias as it is initial when bias, when bias be 10424Ts；User 3（Time delay is
60000Ts）More than 2*24576Ts, all do not occur leading ID2 in the 1st section and the 2nd section of peakvalue's checking, it is partially excessive super during user 3
Cross inclined scope during the leading form, the random access failure of user 3.
Step 404, calibrated：What the leading ID by judging same user occurred in N+1 parallel detection window
Situation, calibrated partially when carrying out different respectively, it is inclined when obtaining correct.Herein it is leading be a user leading ID, difference use
The leading ID at family is to differ, and this step is the situation that same user is detected in N+1 sections.
In the present embodiment, the first testing result for not seeing the 3rd section, the leading ID of user 1 are parallel at the 1st section and the 2nd section 2
When all occurring in peakvalue's checking, bias is not required to calibrate when initial, and bias is as the when bias finally reported, i.e. 1000TS when initial
As it is last when bias；When the leading ID of user 2 does not occur in the 1st peakvalue's checking and occurred in the 2nd peakvalue's checking,
When not occurring at the 1st section and occurring for the 2nd section, bias obtains calibration value 35000Ts, high-ranking officers plus 24576Ts when will be initial
Quasi- value is as the when bias finally reported；When the leading ID of user 3 does not occur in 3 peakvalue's checkings, time delay is excessive to be caused
Random access failure.Therefore, in the case of N=1, inclined scope is during the maximum that can be detected using the system（1+1）*24576Ts=
49152Ts。
For example, covering 200KM cell in the case where not changing frequency domain resource, now trip path time delay reaches
1.34ms, using traditional design mode and detection algorithm, do not consider that maximum delay extends, CP and GT parts at least need
2.68ms, while TSEQNeed by the change sampling of 839RACH sequences elongate to arrive at least 1.34ms, need 4.02ms altogether, need
Take 5 TTI.And use the present invention sending method and detection method, take N=1, can detect 2*24576Ts=1.6ms when
Prolong, GT length takes 1.34ms, total length 1.6+1.34=2.94ms, and 200KM is covered enough using 3 TTI.
The embodiment of the present invention 2：
In the case where not changing LTERACH frequency domain resources, to cover 360KM cells as embodiment, to the hair of the present invention
Delivery method and method of reseptance are illustrated.The present embodiment totally 4 users, under low speed scene, the random access guiding ID number of transmission
Respectively 0,1,2,3, Ncs=0, the path delay of time added in emulation is respectively 1000Ts（Within 100KM）, 35000Ts（100~
Within 200KM）, 70000Ts（200KM~360KM）、80000Ts（More than 360KM）.
The sending method of the embodiment of the present invention 2 comprises the following steps：
Step 201, RACH is configured as follows；
In the case where not changing frequency domain resource, 360KM cell is now covered, sending method of the invention is：It is first
N size is first calculated, now R=360Km, according to N calculation formula Obtain N=2, sequence
Row length is 2*24576Ts, and CP length is 24576Ts, and trip path time delay reaches 2.412ms, and GT length takes 2.412ms, then
RACH total lengths are 3*24576Ts+2.412ms=2.4ms+2.412ms=4.812ms, 5 TTI are only needed altogether, due to altogether
5 TTI are taken, therefore are 2.6ms by GT length adjustments.The RACH preamble structures signal that 360KM is covered in the embodiment of the present invention
Figure is as shown in Figure 8.
In the case where not changing frequency domain resource cover 360KM cell, when use traditional design mode and detection algorithm,
CP and GT parts at least need 4.824ms, while Sequence needs by the change sampling of 839RACH sequences elongate at least
2.4ms, 7.224ms is needed altogether, it is necessary to take 8 TTI.And use the sending method and detection method of the present invention, it is only necessary to 5
Individual TTI, system time-domain resource is effectively saved.
Step 202, it is leading to obtain new RACH, and it is new leading according to the transmission of RACH configuration modes.
The reception device that the present invention improves covering power comprises the following steps：
Step 401, peakvalue's checking sequential extraction procedures：Base station side receives accidental access signal, is obtained according to leading configuration index
Leading time-domain position, extract being total to including CP and sequence and part GT（N+2）* the data of 24576Ts length, due to
N=2 in the present embodiment 2, then the sequence of 4 24576Ts length is extracted, data are divided into 4 sections according to this from front to back；
Step 402, peak value parallel detection is carried out：4 peakvalue's checking sequences are subjected to parallel peakvalue's checking respectively.Record
SINR in every section of targeting sequencing ID detected, time offset and calculating detection window.
Step 402 is described in detail embodiment 1, does not repeat herein.
Step 403, it is inclined when obtaining initial：Pass through the leading ID results and SINR cascading judgement to every section of parallel detection
Bias when obtaining initial.The 4th section of testing result is not considered first：Detect, that is, exist if same leading ID is more than the 3rd section
Occur in 3rd section and one section at least in the 1st section or the 2nd section, then using the 3rd section estimation when bias as it is initial when it is inclined
Value；If same leading ID only in the 3rd section of appearance, compares the SINR of 3 sections and 4 sections, takes that section of big sequence estimation of SINR
Out when bias as it is initial when bias.
Totally 4 users are respectively 1000Ts in the path delay of time to the present embodiment（Within 100KM）, 35000Ts（100~200KM with
It is interior）, 70000Ts（200KM~360KM）、80000Ts（More than 360KM）.As shown in figure 9, only see the 1st, the 2nd and the 3rd section of inspection
Result is surveyed, user 1（Time delay is 1000Ts）Fall [0~24576）In Ts, all detect the user's at the 1st, the 2nd and the 3rd section
Leading ID0, using the 3rd section estimation when bias as it is initial when bias, when bias be 1000Ts；User 2（Time delay is 35000Ts）
Fall in [24576Ts~2*24576）In Ts, the leading ID1 of the user is all detected at the 2nd and the 3rd section, the 3rd section is estimated
When bias as it is initial when bias, when bias be 10424Ts；User 3（Time delay is 70000Ts）Fall in [2*24576Ts~3*
24576）In Ts, the leading ID2 of the user is only detected at the 3rd section, compares the SINR of 3 sections and 4 sections, the 4th section of SINR is big, takes
4th section estimate when bias as it is initial when bias, when bias be 20848Ts；User 4（Time delay is 80000Ts）Exceed
3*24576Ts, does not occur leading ID3 in the 1st, 2,3 section of peakvalue's checking, partially excessive when exceeding the leading form during user 4
Inclined scope, the random access failure of user 4.
Step 404, calibrated：Situation about occurring by judging same leading ID in N+1 parallel detection window, point
Calibrated partially when not carrying out different, it is inclined when obtaining correct.
In the present embodiment, the 4th section of testing result is not seen first, the leading ID of user 1 is at the 1st section, the 2nd section and the 3rd
In 3 parallel peakvalue's checkings of section when all occurring, bias is not required to calibrate when initial, when initial bias as finally report when it is inclined
Value, i.e. 1000TS as it is last when bias；The leading ID of user 2 does not occur in the 1st peakvalue's checking and at remaining 2nd section
During with occurring in the 3rd section of peakvalue's checking, bias obtains 35000TS calibration value plus 24576Ts when will be initial, and calibration value is made
For the when bias finally reported；The leading ID of user 3 does not occur in the 1st and the 2nd peakvalue's checking and at remaining 3rd section of peak
In value detection when occurring, bias obtains calibration value 70000Ts plus 2*24576Ts when will be initial, using calibration value as on finally
The when bias of report；When the leading ID of user 4 does not occur in preceding 3 peakvalue's checkings, time delay is excessive to cause random access failure
Or the leading ID is not sent out.Therefore, in the case of N=2, inclined scope is during the maximum that can be detected using the system（2+1）*
24576Ts=73728Ts, can covering radius be 360KM.
The embodiment of the present invention 3：
In the case where not changing LTERACH frequency domain resources, to cover 100KM cells as embodiment, to the hair of the present invention
Delivery method and method of reseptance are illustrated.
The sending method of the embodiment of the present invention 3 comprises the following steps：
Step 201, RACH is configured as follows；
In the case where not changing frequency domain resource, 100KM cell is now covered, sending method of the invention is：It is first
N size is first calculated, now R=100Km, according to N calculation formula N=0 is obtained, by
In N >=1, therefore N takes 1, and sequence length 24576Ts, CP length are 24576Ts, and trip path time delay reaches 0.67ms, GT length
Degree takes 0.67ms, then RACH total lengths are 2*24576Ts+0.67ms=1.6ms+0.67ms=2.27ms, need 3 TTI altogether,
It is 1.4ms due to taking 3 TTI altogether, therefore by GT length adjustments, therefore the reality in 100KM covering form and the present invention
The 200KM covering forms applied in example 1 are identical, as shown in Figure 6.
The running time-frequency resource expense and the existing covering 100KM of LTE leading form 3 that this leading form needs are identical, while not
Need to change frequency domain position, only change the RACH signals in time domain, smaller to protocol change, change is got up convenient, it is easy to accomplish.
The leading forms of RACH for the support 100KM that the present invention designs are more flexible, can use the method for reseptance of the present invention
（Elaborated, do not repeated herein in embodiment 1）, 100KM is not only realized using the method for reseptance of the present invention and covered
Lid can also realize that 200KM is covered, and effectively expand the coverage of system；Traditional method of reseptance can also be used, is adopted
The identical 100KM of form 3 coverings existing with RACH can be realized with conventional receiver method.For the present embodiment because only needing to cover
100KM is covered, therefore uses traditional detection method.
As can be seen from the above technical solutions, a kind of sending method for improving covering power provided by the invention, is by CP
And TSEQThe sequence or sequence being designed in units of 24576Ts repeat, and are sent compared to tradition, and RACH of the invention is leading
The time-domain resource of occupancy is smaller.CP is designed to 24576Ts regular length by the present invention, is N number of 24576Ts's in Sequence
In the case of, receiving terminal utilizes CP and TSEQThe characteristics of sequence repeats carries out detection of preamble with calibration partially in time, it would be preferable to support（N+1）*
24576Ts when it is inclined, by system it is supported when inclined scope from being limited to TSEQThe 24576Ts expanded in size of length arrives（N+1）*
24576Ts。
Under the sending method of the present invention, the method for reseptance provided by the invention for improving covering power is by including comprising CP
（N+1）* the long sequences of 24576Ts are divided into the N+1 processing sequence in units of 24576Ts, and they are carried out into peak value inspection respectively
Survey, bias when obtaining initial by the cascading judgement of leading ID and SINR to every section of peakvalue's checking, and to it is initial when bias
Calibrated, due to make use of 24576Ts CP length and TSEQThe characteristics of 24576Ts is repeated, the maximum that the system can be supported
When inclined scope expanded as from traditional 24576Ts（N+1）*24576Ts.
In the case where not increasing frequency domain resource, method of sending and receiving provided by the invention can be less by taking
Time-domain resource reaches the purpose for expanding system ovelay range, smaller to protocol modification, reduces expense, and be easily achieved.
Although the present invention is described in detail above, developed simultaneously embodiment, of the invention and applicable reality
A not limited to this is applied, those skilled in the art of the present technique can carry out various modifications according to the principle of the present invention.Therefore, it is all according to this
The modification that inventive principle is made, it all should be understood to fall into protection scope of the present invention.
Claims (7)
- A kind of 1. accidental access signal method of sending and receiving applied to large coverage, it is characterised in that：Including following step Suddenly：User device configuration RACH RACH forms, the CP length of RACH forms, which is set, includes M repeatedly 24576Ts、TSEQLength is arranged to the 24576Ts of N number of repetition, wherein M=1, N >=1；N is by formulaR is covering scene radius, and C is the light velocity, and Ts=1/ (15000*2048) s is obtained；By The protection interval GT that RACH signals take length adjustment RACH signals is extremely more than or equal to trip path time delay；For RACH signals after user's setting send configuration to base station, base station extracts the peakvalue's checking sequence of N+2 sections 24576Ts length Row；N+2 section peakvalue's checking sequences are subjected to peakvalue's checking respectively；The targeting sequencing ID results and noise detected side by side to every section Bias when cascading judgement than SINR obtains initial；By judging that same targeting sequencing ID goes out in N+1 parallel detection window Existing situation, to it is initial when bias carry out calibration obtain correct targeting sequencing ID and when bias, accidental access signal receive into Work(.
- 2. a kind of accidental access signal method of sending and receiving applied to large coverage according to claim 1, its It is characterised by：The peakvalue's checking sequential extraction procedures process is：From the beginning the sequence extracted is divided successively backward with 24576Ts length For the 1st section, the section sequence of the 2nd section of N+2 section, parallel peakvalue's checking is carried out respectively to section sequence, records every section of peak value The targeting sequencing ID of detection and when bias and N+1 sections and N+2 sections detection window in SINR.
- 3. a kind of accidental access signal method of sending and receiving applied to large coverage according to claim 2, its It is characterised by：It is as follows to obtain process for bias when described initial：The testing result of the N+2 sections in section sequence is removed, when N+1 sections And at least one section in remaining N sections detects same preamble serial ID, then using N+1 section sequence estimations when bias as just The bias during beginning；The testing result of the N+2 sections in section sequence is removed, is occurred when same targeting sequencing ID in N+1 sections, then Compare the SINR of N+1 sections and N+2 sections, take that section of big sequence estimation of SINR come out when bias as it is initial when bias.
- 4. a kind of accidental access signal method of sending and receiving applied to large coverage according to claim 1, its It is characterised by：The N+2 sections peakvalue's checking sequence carries out peak-value detection method respectively：Every section of peakvalue's checking sequence frequency displacement is arrived At DC, sequence is filtered and down-sampling, obtains the sequence that length is 2048Ts, carry out 2048 point quick Fourier conversion, 839 point original ZC sequences are therefrom extracted, locally the frequency domain sequence of female code is total to the multiple of RACH frequency domain sequences received with ZC sequences Yoke is multiplied, and carries out 1536 points of inverse discrete Fourier transform, obtains PDP time domain correlations；PDP time domain correlations are taken into average, The setting of threshold value and the detection of peak value are carried out according to PDP averages, records the every section of targeting sequencing detected ID and corresponding When bias, calculate obtain SINR.
- 5. a kind of accidental access signal method of sending and receiving applied to large coverage according to claim 1, its It is characterised by：Bias calibration includes three kinds of modes when described：The first：Remove the testing result of N+2 sections, when same targeting sequencing ID in the parallel peakvalue's checking of preceding N+1 all During appearance, bias is not required to calibrate when initial, and bias is as the when bias finally reported when will be initial；Second：The testing result of N+2 sections is removed, when same targeting sequencing ID is at 1M (M=1N) When not occurring in individual peakvalue's checking, and occurring in remaining N+1-M peakvalue's checking, bias adds M* when will be initial 24576Ts obtains calibration value, using calibration value as the when bias finally reported；The third：The testing result of N+2 sections is removed, when same targeting sequencing ID does not occur in N+1 peakvalue's checking When, time delay is excessive to be caused random access failure or does not send out targeting sequencing ID.
- 6. a kind of accidental access signal method of sending and receiving applied to large coverage according to claim 1, its It is characterised by：The SINR value is the PDP peak energies in detection window and total PDP energy ratios.
- 7. a kind of accidental access signal method of sending and receiving applied to large coverage according to claim 6, its It is characterised by：The PDP peak energies are the energy that PDP peak maximums energy is nearby put plus peak value.
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| CN108156595B (en) * | 2017-12-05 | 2020-07-03 | 南京邮电大学 | Preamble resource allocation method based on timing advance command in machine communication |
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