CN103889069A - Random access signal sending and receiving method applied to large coverage area - Google Patents

Random access signal sending and receiving method applied to large coverage area Download PDF

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CN103889069A
CN103889069A CN201410119585.9A CN201410119585A CN103889069A CN 103889069 A CN103889069 A CN 103889069A CN 201410119585 A CN201410119585 A CN 201410119585A CN 103889069 A CN103889069 A CN 103889069A
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CN103889069B (en
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邓风
王俊
李洋
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Wuhan Research Institute of Posts and Telecommunications Co Ltd
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Wuhan Research Institute of Posts and Telecommunications Co Ltd
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Abstract

The invention provides a random access signal sending and receiving method applied to a large coverage area. The method comprises the steps that user equipment is configured to be in an RACH format, the CP length of the RACH format is set to be M repeated 24576Ts, the T<SEQ> length of the RACH format is set to be N repeated 24576Ts, M=1, N>=1, N=[2*R/(C*24567Ts)]-1, R is the radius of a covered scene, C is the speed of light, and Ts=1/(15000*2048)s; the guard interval GT of an RACH signal is adjusted to be larger than or equal to the round trip time delay according the RACH signal occupying length; a configured RACH signal is sent, and a base station extracts N+2 peak detection sequences which are 24576Ts long; peak detection is conducted on the N+2 peak detection sequences; an initial time migration value is obtained through combined judgment of a leader ID result and SINR of each section of parallel detection; the initial time migration value is corrected to obtain a correct leader ID and time migration value by judging the situation that the same leader ID appears in N+1 parallel detection windows. By the adoption of the method, over 100KM large-area coverage can be realized, timing accuracy requirements under over-distance coverage can be met, time-frequency resources are saved, and protocol modification is small.

Description

A kind of accidental access signal method of sending and receiving that is applied to large coverage
Technical field
The present invention relates to mobile communication system Frequency Division Duplexing (FDD) Long Term Evolution (FDD-LTE) field, relate in particular to the accidental access signal method of sending and receiving under a kind of large covering, the invention belongs to the communications field.
Background technology
In LTE-FDD system, subscriber equipment is set up up initial synchronisation by random access procedure and base station, the initial timing lead (TA) of subscriber equipment reports by Random Access Channel measurement, therefore, can correctly estimate TA, can obtain uplink time synchronized to subscriber equipment, and can be carried out uplink by correct scheduling below and have important impact.
The leading form of LTE-FDD system Random Access Channel (RACH) has 4 kinds at present, and every kind of form has Cyclic Prefix (CP) and sequence (T separately sEQ) length, and different CP and T sEQlength has the radius of society reaching and the time delay scope of its correspondence.In these leading forms that designed, the CP of leading form 3 is long is 21024Ts, T sEQthe repetitive sequence long by two 24576Ts forms, adopt traditional lead detecting method, the maximum delay that this form can be supported is 24576Ts, the covering radius of corresponding 100KM left and right, be not suitable for exceeding for radius the special screne of 100KM under the prerequisite that does not increase base station equipment, under the above special screne of 100KM, use existing leading form and its traditional detection algorithm, can cause TA misjudgment, will affect subscriber equipment and obtain the success rate of uplink synchronous.
In order to cover larger scope; tradition sending method need to be offset round-trip delay by the covering demand corresponding CP of configuration RACH and protection interval (GT) length, and cell coverage area is larger, and propagation delay time is longer; the CP and the GT that need are larger, also need to increase the T of RACH simultaneously sEQlength and frequency domain bandwidth, make RACH meet the timing accuracy demand of system, causes the waste of running time-frequency resource.
Summary of the invention
The object of this invention is to provide a kind of random signal access method of sending and receiving that improves covering power, so that in expanding the coverage area, save system time frequency resource.
The technical solution adopted in the present invention is:
Be applied to an accidental access signal method of sending and receiving for large coverage, comprise the steps: user device configuration Random Access Channel RACH form, the CP length setting of RACH form comprises M the 24576Ts, the T that repeat sEQlength is set to N the 24576Ts repeating, wherein M=1, N>=1; N is by formula
Figure BDA0000483182850000021
r is covering scene radius, and C is the light velocity, Ts= 1/ (15000*2048) sobtain; The protection interval GT that takies length adjustment RACH signal by RACH signal is to being more than or equal to trip path time delay; User arranges the RACH signal sending after configuration to base station, and base station extracts the long peak value of N+2 24576Ts and detects sequence; N+2 section peak value is detected to sequence and carry out respectively peak value detection; The cascading judgement of every section of leading ID result detecting side by side and SINR is obtained when initial and is partially worth; By the situation that judges that same leading ID occurs in N+1 parallel detection window, when initial partially value calibrate leading ID that acquisition is correct and time be partially worth, accidental access signal receives successfully.
Described peak value detects sequential extraction procedures process: from the beginning the sequence extracting is divided into the 1st section so that 24576Ts is long backward according to this, the 2nd section ... the section sequence of N+2 section, the section sequence peak value that walks abreast is respectively detected, record the SINR in targeting sequencing ID and time offset result and N+1 section and the N+2 section detection window that every section of peak value detects.
It is described that value procurement process is as follows partially when initial: the testing result of the N+2 section in the section of removing sequence, same preamble ID detected when at least one section in N+1 section and residue N section, using N+1 section sequencal estimation time partially value be partially worth as initially time; The testing result of the N+2 section in the section of removing sequence, when same leading ID only occurs in N+1 section, the SINR of N+1 section and N+2 section relatively, get that section of sequencal estimation that SINR is large out time partially value be partially worth as initially time.
Described N+2 section peak value detection sequence is carried out respectively peak-value detection method and is: every section of peak value is detected to sequence frequency displacement to DC place, sequence is carried out to filtering and down-sampling, obtain the sequence that length is 2048Ts, carry out 2048 point quick Fourier conversion, therefrom extract 839 former ZC sequences, multiply each other by the complex conjugate of the frequency domain sequence of the local female code of ZC sequence and the RACH frequency domain sequence of reception, carry out the inverse discrete Fourier transform of 1536, obtain PDP time domain correlation; PDP time delay correlation is got to average, carry out the setting of threshold value and the detection of peak value according to PDP average, record every section of targeting sequencing ID detecting and be partially worth when corresponding, calculate and obtain SINR.
When described, partially calibration comprises three kinds of mode: I) remove the testing result of N+2 section, in the time that same leading ID occurs in front N+1 parallel peak value detects, when initial, inclined to one side value does not need calibration, when initial partially value as finally report time be partially worth; II) remove the testing result of N+2 section, when same leading ID is at 1...M(M=1...N) the not appearance in detecting of individual peak value, and while occurring in remaining N+1-M peak value detects, value adds that M*24576Ts obtains calibration value partially when initial, using calibration value as finally report time be partially worth; III) remove the testing result of N+2 section, in the time that same leading ID does not occur in N+1 peak value detects, time delay is excessive to be caused random access failure or not to send out this leading ID.Described SINR value is PDP peak energy in detection window and total PDP energy ratio.Described PDP peak energy is that PDP peak maximum energy adds near the energy of putting upward peak.
Tool of the present invention has the following advantages:
For successfully access under the large covering scene more than 100KM, the invention provides large covering accidental access method more than a kind of 100KM of being applicable to, the method does not change the frequency domain resource that RACH takies, the extra time-domain resource of required increase is less, can ensure systematic function, save system resource, reduce expense simultaneously.
Brief description of the drawings
The RACH preamble structure schematic diagram that Fig. 1 designs for the present invention;
Fig. 2 is that RACH peak value of the present invention detects sequential extraction procedures schematic diagram;
Fig. 3 is the realization flow figure of RACH sending method of the present invention;
Fig. 4 is base station side RACH overhaul flow chart of the present invention;
Fig. 5 is base station side RACH of the present invention test section flow chart;
Fig. 6 is the leading structural representation of RACH in the embodiment of the present invention 1;
Fig. 7 is that in the embodiment of the present invention 1, RACH peak value detects sequential extraction procedures schematic diagram;
Fig. 8 is the leading structural representation of RACH in the embodiment of the present invention 2;
Fig. 9 is that in the embodiment of the present invention 2, RACH peak value detects sequential extraction procedures schematic diagram;
Embodiment
Below in conjunction with each embodiment, the beneficial effect of mainly realizing principle, embodiment and can reach of the present invention is described in detail.
A kind of accidental access signal method of sending and receiving that is applied to large coverage involved in the present invention, comprise the steps: user device configuration Random Access Channel RACH form, as shown in Figure 1, the CP length setting of RACH form comprises M 24576Ts, the T repeating sEQlength is set to N the 24576Ts repeating, wherein M=1, N>=1; N is by formula
Figure BDA0000483182850000041
r is covering scene radius, and C is the light velocity, Ts= 1/ ( 15000*2048) sobtain; The protection interval GT that takies length adjustment RACH signal by RACH signal is to being more than or equal to trip path time delay; User arranges the RACH signal sending after configuration to base station, and base station extracts the long peak value of N+2 24576Ts and detects sequence; N+2 section peak value is detected to sequence and carry out respectively peak value detection; The cascading judgement of every section of leading ID result detecting side by side and SINR is obtained when initial and is partially worth; By the situation that judges that same leading ID occurs in N+1 parallel detection window, when initial partially value calibrate leading ID that acquisition is correct and time be partially worth, accidental access signal receives successfully.
The embodiment of the present invention respectively and 100KM above for 100KM is elaborated with interior covering, and embodiment 1 and embodiment 2 are giving an example of the above coverage of 100KM, and respectively for 200KM and 360KM coverage condition, embodiment 3 is that 100KM covers for example.
The embodiment of the present invention 1:
In the situation that not changing LTERACH frequency domain resource, to cover 200KM community as embodiment, sending method of the present invention and method of reseptance are set forth.
The present embodiment is totally 3 users, and under low speed scene, the random access guiding of transmission is respectively 0 No. ID, 1,2, Ncs=0, in embodiment, be respectively in 1000Ts(100KM each user's the path delay of time), in 35000Ts(100～200KM), 50000Ts(exceedes 200KM).
Below in conjunction with accompanying drawing 2 and Fig. 3, the embodiment of the present invention 1 sending method is elaborated, sending method comprises the following steps:
Step 201, subscriber equipment configures RACH as follows;
In the situation that not changing frequency domain resource, now to cover the community of 200KM, sending method of the present invention is: first calculate the size of N, now R=200KM, according to the computing formula of N
Figure BDA0000483182850000051
obtain N=1, T sEQlength is 24576Ts; CP length is 24576Ts; trip path time delay reaches 1.34ms; protection interval GT length is got 1.34ms; under RACH, total length is 2*24576Ts+1.34ms=1.6ms+1.34ms=2.94ms; altogether only needing 3 TTI, owing to altogether taking 3 TTI, is therefore 1.4ms by GT length adjustment.GT designs according to conventional method, calculates after round-trip delay, and the length that GT can take according to RACH signal suitably tunes up, and protection interval GT is more than or equal to maximum round trip time delay.
The RACH preamble structure schematic diagram that in the embodiment of the present invention, 200KM covers as shown in Figure 6, adopt method of sending and receiving of the present invention, the existing leading form 3 of needed running time-frequency resource expense and LTE is identical, leading form 3 is a kind of RACH forms of the coverage maximum of agreement the inside regulation, its coverage is 100KM, and method of sending and receiving of the present invention can cover 200KM, effectively save running time-frequency resource, expand the coverage of system; Meanwhile, this leading form is just changed RACH signal in time domain, and frequency domain remains unchanged, and less to agreement change, change is got up convenient, is easy to realize.
Especially, if the leading form in the present embodiment only need cover 100KM scope, can not use method of reseptance of the present invention, adopt traditional method of reseptance, the running time-frequency resource expense and the overlayable scope that need with existing leading form 3 are identical.
Step 202, obtains new RACH leading, and sends RACH signal according to RACH configuration mode.
The method of reseptance that the embodiment of the present invention 1 is improved to covering power below in conjunction with accompanying drawing 4 is elaborated, and accidental access signal method of reseptance comprises the following steps:
Step 401, peak value detects sequential extraction procedures: base station side receives accidental access signal, obtain leading time-domain position according to leading configuration index, extract the long data of (N+2) * 24576Ts altogether including CP and sequence and part GT, due to N=1 in the present embodiment, extract the long sequence of 3 24576Ts, data are divided into 3 sections from front to back according to this, as shown in Figure 7;
Step 402, carries out peak value parallel detection: 3 peak values are detected to the sequences peak value detection that walk abreast respectively.Record every section of targeting sequencing ID detecting, time deviator and power-delay spectrum (PDP) signal to noise ratio (SINR).
The present embodiment is elaborated to step 402 in conjunction with Fig. 5:
Step 501, when each sequence is carried out to peak value detection, every section of peak value is detected to sequence frequency displacement to be located to direct current (DC), sequence is carried out to the down-sampling of filtering and 12 times, obtain the sequence that length is 2048Ts, carry out 2048 point quick Fourier conversion (FFT), therefrom extract 839 former Zadoff-Chu(ZC) sequence, multiply each other by the complex conjugate of the frequency domain sequence of the local female code of ZC sequence and the RACH frequency domain sequence of reception, carry out the inverse discrete Fourier transform (IDFT) of 1536, obtain PDP time domain correlation.
Step 502, averages PDP, carries out the setting of threshold value and the detection of peak value according to PDP average, travels through 64 root sequences, detects user's leading ID and time offset, calculates and obtains the N+1 of detection window and the SINR value of N+2 section.According to correlation method estimating time bias method comparative maturity, do not do too much elaboration herein.In this step, calculating and obtaining the SINR that peak value detects is PDP peak energy in detection window and total PDP energy ratio.PDP peak energy is the energy that PDP peak maximum energy adds near the some points of upward peak, in the present invention, can select near the energy of 6 points peak value, cause energy to be scattered because 839 ZC sequences are impacted broadening while for example, calculating PDP through K point (K=1536) IDFT.
Step 403, obtains when initial inclined to one side: obtained when initial and be partially worth by the cascading judgement of the leading ID result to every section of parallel detection and SINR.First do not consider the testing result of the 3rd section: if same leading ID just do not detect at the 2nd section, all detect at the 1st and the 2nd section, using the 2nd section of estimation time partially value be partially worth as initially time; If same leading ID is only the 2nd section of appearance, the SINR of 2 sections and 3 sections relatively, get that section of sequencal estimation that SINR is large out time partially value conduct be partially worth initially time; If same leading ID do not occur at the 1st section and the 2nd section, think not this user.
Totally 3 users of the present embodiment is respectively in 1000Ts(100KM the path delay of time), in 35000Ts(100～200KM), 50000Ts(exceedes 200KM).As shown in Figure 6, user 1(time delay is 1000Ts) drop on [0～24576) in Ts, all detect at the 1st and the 2nd section, using the 2nd section of estimation time partially value be partially worth when initial, time to be partially worth be 1000Ts; User 2(time delay is 35000Ts) drop on [24576Ts～2*24576) in Ts, only all detect at the 2nd section, the relatively SINR of 2 sections and 3 sections, the SINR of the 3rd section is large, get the 3rd section estimate time partially value be partially worth when initial, time to be partially worth be 10424Ts; User 3(time delay is 60000Ts) exceed 2*24576Ts, in detecting, the 1st section and the 2nd section of peak value all there is not leading ID2, partially excessive inclined to one side scope while exceeding this leading form when user 3, user's 3 random access failures.
Step 404, calibrates: by the situation that judges that same user's leading ID occurs in N+1 parallel detection window, carry out respectively when different partially calibrating, obtain when correct inclined to one side.Leading is herein a user's leading ID, and the leading ID of different user is not identical, and this step is the situation that same user is detected in N+1 section.
In the present embodiment, first do not see the testing result of the 3rd section, when leading ID of the user 1 occurs in the 1st section and the 2nd section 2 parallel peak values detect, when initial, inclined to one side value does not need to calibrate, when initial partially value conduct finally report time be partially worth, 1000TS is worth when last partially; Leading ID of the user 2 does not occur and while occurring in the 2nd peak value detects in the 1st peak value detects, the 1st section do not occur and in the time occurring for the 2nd section, value adds that 24576Ts obtains calibration value 35000Ts partially when initial, using calibration value as finally report time be partially worth; When leading ID of the user 3 does not occur in 3 peak values detect, the excessive random access failure that causes of time delay.Therefore,, in N=1 situation, while using maximum that this system can detect, inclined to one side scope is (1+1) * 24576Ts=49152Ts.
For example, cover the community of 200KM in the situation that not changing frequency domain resource, now trip path time delay reaches 1.34ms, adopts traditional design mode and detection algorithm, does not consider maximum delay expansion, and CP and GT part at least need 2.68ms, T simultaneously sEQ839RACH sequence need to be changed to sampling and elongate at least 1.34ms, altogether need 4.02ms, need to take 5 TTI.And adopt sending method of the present invention and detection method, and get N=1, can detect the time delay of 2*24576Ts=1.6ms, GT length is got 1.34ms, and total length 1.6+1.34=2.94ms uses 3 TTI enough to cover 200KM.
The embodiment of the present invention 2:
In the situation that not changing LTERACH frequency domain resource, to cover 360KM community as embodiment, sending method of the present invention and method of reseptance are set forth.The present embodiment is totally 4 users, under low speed scene, the random access guiding sending is respectively 0 No. ID, 1,2,3, Ncs=0, be respectively in 1000Ts(100KM the path delay of time adding in emulation), in 35000Ts(100～200KM), 70000Ts(200KM～360KM), 80000Ts(exceedes 360KM).
The embodiment of the present invention 2 sending methods comprise the following steps:
Step 201, configures RACH as follows;
In the situation that not changing frequency domain resource, now to cover the community of 360KM, sending method of the present invention is: first calculate the size of N, now R=360Km, according to the computing formula of N
Figure BDA0000483182850000091
Figure BDA0000483182850000092
obtain N=2, sequence length is 2*24576Ts, CP length is 24576Ts, trip path time delay reaches 2.412ms, GT length is got 2.412ms, and RACH total length is 3*24576Ts+2.412ms=2.4ms+2.412ms=4.812ms, altogether only needs 5 TTI, owing to altogether taking 5 TTI, be therefore 2.6ms by GT length adjustment.The RACH preamble structure schematic diagram that in the embodiment of the present invention, 360KM covers as shown in Figure 8.
In the situation that not changing frequency domain resource, cover the community of 360KM, when adopting traditional design mode and detection algorithm, CP and GT part at least need 4.824ms, Sequence need to elongate at least 2.4ms by 839RACH sequence change sampling simultaneously, altogether need 7.224ms, need to take 8 TTI.And adopt sending method of the present invention and detection method, and only need with 5 TTI, effectively save system time-domain resource.
Step 202, obtains new RACH leading, and sends newly leading according to RACH configuration mode.
The receiving system that the present invention improves covering power comprises the following steps:
Step 401, peak value detects sequential extraction procedures: base station side receives accidental access signal, obtain leading time-domain position according to leading configuration index, extract the long data of (N+2) * 24576Ts altogether including CP and sequence and part GT, due to N=2 in the present embodiment 2, extract the long sequence of 4 24576Ts, data are divided into 4 sections from front to back according to this;
Step 402, carries out peak value parallel detection: 4 peak values are detected to the sequences peak value detection that walk abreast respectively.Record every section of targeting sequencing ID detecting, time offset and calculate the SINR in detection window.
Embodiment 1 have been described in detail step 402, does not repeat herein.
Step 403, obtains when initial inclined to one side: obtained when initial and be partially worth by the cascading judgement of the leading ID result to every section of parallel detection and SINR.First do not consider the testing result of the 4th section: if same leading ID not just the 3rd section detect, at the 3rd section and at least occur in a section in the 1st section or the 2nd section, using the 3rd section of estimation time partially value be partially worth as initially time; If same leading ID is only the 3rd section of appearance, the SINR of 3 sections and 4 sections relatively, get that section of sequencal estimation that SINR is large out time partially value conduct be partially worth initially time.
Totally 4 users of the present embodiment is respectively in 1000Ts(100KM the path delay of time), in 35000Ts(100～200KM), 70000Ts(200KM～360KM), 80000Ts(exceedes 360KM).As shown in Figure 9, only see the testing result of the 1st, the 2nd and the 3rd section, user 1(time delay is 1000Ts) drop on [0～24576) in Ts, at the 1st, the 2nd and the 3rd section of leading ID0 that this user all detected, using the 3rd section of estimation time partially value be partially worth when initial, time to be partially worth be 1000Ts; User 2(time delay is 35000Ts) drop on [24576Ts～2*24576) in Ts, at the 2nd and the 3rd section of leading ID1 that this user all detected, using the 3rd section of estimation time partially value be partially worth when initial, time to be partially worth be 10424Ts; User 3(time delay is 70000Ts) drop on [2*24576Ts～3*24576) in Ts, only at the 3rd section of leading ID2 that this user detected, the relatively SINR of 3 sections and 4 sections, the SINR of the 4th section is large, get the 4th section estimate time partially value be partially worth when initial, time partially value be 20848Ts; User 4(time delay is 80000Ts) exceed 3*24576Ts, in detecting, the 1st, 2,3 sections of peak values all there is not leading ID3, partially excessive inclined to one side scope while exceeding this leading form when user 4, user's 4 random access failures.
Step 404, calibrates: by the situation that judges that same leading ID occurs in N+1 parallel detection window, carry out respectively when different partially calibrating, obtain when correct inclined to one side.
In the present embodiment, first do not see the testing result of the 4th section, when leading ID of the user 1 occurs in the 1st section, the 2nd section and the 3rd section 3 parallel peak values detect, when initial, inclined to one side value does not need calibration, when initial partially value conduct finally report time be partially worth, 1000TS is worth when last partially; Leading ID of the user 2 do not occur and while occurring in remaining the 2nd section and the 3rd section of peak value detect in the 1st peak value detects, and inclined to one side value adds that 24576Ts obtains the calibration value of 35000TS when initial, using calibration value as finally report time be partially worth; Leading ID of the user 3 do not occur and while occurring in the 3rd section of remaining peak value detects in the 1st and the 2nd peak value detects, and value adds that 2*24576Ts obtains calibration value 70000Ts partially when initial, using calibration value as finally report time be partially worth; When leading ID of the user 4 does not occur in front 3 peak values detect, time delay is excessive to be caused random access failure or not to send out this leading ID.Therefore,, in N=2 situation, while using maximum that this system can detect, inclined to one side scope is (2+1) * 24576Ts=73728Ts, can covering radius be 360KM.
The embodiment of the present invention 3:
In the situation that not changing LTERACH frequency domain resource, to cover 100KM community as embodiment, sending method of the present invention and method of reseptance are set forth.
The embodiment of the present invention 3 sending methods comprise the following steps:
Step 201, configures RACH as follows;
In the situation that not changing frequency domain resource, now to cover the community of 100KM, sending method of the present invention is: first calculate the size of N, now R=100Km, according to the computing formula of N
Figure BDA0000483182850000111
Figure BDA0000483182850000112
obtain N=0, due to N>=1, therefore N gets 1, sequence length is 24576Ts, CP length is 24576Ts, and trip path time delay reaches 0.67ms, and GT length is got 0.67ms, RACH total length is 2*24576Ts+0.67ms=1.6ms+0.67ms=2.27ms, altogether needing 3 TTI, owing to altogether taking 3 TTI, is therefore 1.4ms by GT length adjustment, therefore to cover form identical for the covering form of 100KM and the 200KM in embodiment 1 in the present invention, as shown in Figure 6.
The leading form 3 of the running time-frequency resource expense that this leading form needs and the existing covering of LTE 100KM is identical, does not need to change frequency domain position simultaneously, only changes the RACH signal in time domain, and less to agreement change, change is got up convenient, is easy to realize.
The leading form of RACH of the support 100KM of the present invention's design is more flexible, can adopt method of reseptance of the present invention (in embodiment 1, to elaborate, do not repeat) herein, adopt method of reseptance of the present invention not only to realize 100KM covering and can also realize 200KM covering, effectively expanded the coverage of system; Can also adopt traditional method of reseptance, adopt traditional method of reseptance can realize the 100KM identical with the existing form 3 of RACH and cover.Because only need to cover 100KM, therefore adopt traditional detection method for the present embodiment.
As can be seen from the above technical solutions, a kind of sending method that improves covering power provided by the invention, is by CP and T sEQthe sequence or the sequence that are all designed to taking 24576Ts as unit repeat, and compare tradition and send, and the leading time-domain resource taking of RACH of the present invention is less.The present invention is designed to CP the regular length of 24576Ts, and in the situation that Sequence is N 24576Ts, receiving terminal utilizes CP and T sEQthe feature that sequence repeats is carried out detection of preamble with in time partially calibration, can support (N+1) * 24576Ts time inclined to one side, when system is supported, inclined to one side scope is from being limited to T sEQthe 24576Ts expanded in size of length is to (N+1) * 24576Ts.
Under sending method of the present invention, the method of reseptance of raising covering power provided by the invention is divided into N+1 the processing sequence taking 24576Ts as unit by comprising CP in the long sequence of interior (N+1) * 24576Ts, they are carried out respectively to peak value detection, obtain when initial and be partially worth by the cascading judgement of leading ID that every section of peak value is detected and SINR, and when initial partially value calibrate, owing to having utilized CP length and the T of 24576Ts sEQthe feature that 24576Ts repeats, this system can be supported when maximum, and inclined to one side scope is expanded as (N+1) * 24576Ts from traditional 24576Ts.
In the situation that not increasing frequency domain resource, method of sending and receiving provided by the invention can reach the object that expands system ovelay range by taking less time-domain resource, less to protocol modification, reduces expense, and is easy to realize.
Although above the present invention is had been described in detail, the embodiment that developed simultaneously, the present invention and applicable embodiment are not limited to this, and those skilled in the art of the present technique can carry out various amendments according to principle of the present invention.Therefore, all amendments of doing according to the principle of the invention, all should be understood to fall into protection scope of the present invention.

Claims (7)

1. an accidental access signal method of sending and receiving that is applied to large coverage, is characterized in that: comprise the steps:
User device configuration Random Access Channel RACH form, the CP length setting of RACH form comprises M the 24576Ts, the T that repeat sEQlength is set to N the 24576Ts repeating, wherein M=1, N>=1; N is by formula
Figure FDA0000483182840000011
r is covering scene radius, and C is the light velocity, Ts=1/ (15000*2048) sobtain; The protection interval GT that takies length adjustment RACH signal by RACH signal is to being more than or equal to trip path time delay;
User arranges the RACH signal sending after configuration to base station, and base station extracts the long peak value of N+2 24576Ts and detects sequence; N+2 section peak value is detected to sequence and carry out respectively peak value detection; The cascading judgement of every section of leading ID result detecting side by side and signal to noise ratio SINR is obtained when initial and is partially worth; By the situation that judges that same leading ID occurs in N+1 parallel detection window, when initial partially value calibrate leading ID that acquisition is correct and time be partially worth, accidental access signal receives successfully.
2. a kind of accidental access signal method of sending and receiving that is applied to large coverage according to claim 1, it is characterized in that: described peak value detects sequential extraction procedures process and is: from the beginning the sequence extracting is divided into the 1st section so that 24576Ts is long backward according to this, the 2nd section ... the section sequence of N+2 section, the section sequence peak value that walks abreast is respectively detected, record the SINR in targeting sequencing ID and time offset result and N+1 section and the N+2 section detection window that every section of peak value detects.
3. a kind of accidental access signal method of sending and receiving that is applied to large coverage according to claim 1, it is characterized in that: described value procurement process is as follows partially when initial: the testing result of the N+2 section in the section of removing sequence, same preamble ID detected when at least one section in N+1 section and residue N section, using N+1 section sequencal estimation time partially value be partially worth as initially time; The testing result of the N+2 section in the section of removing sequence, when same leading ID only occurs in N+1 section, the SINR of N+1 section and N+2 section relatively, get that section of sequencal estimation that SINR is large out time partially value be partially worth as initially time.
4. a kind of accidental access signal method of sending and receiving that is applied to large coverage according to claim 1, it is characterized in that: described N+2 section peak value detection sequence is carried out respectively peak-value detection method and is: every section of peak value is detected to sequence frequency displacement to DC place, sequence is carried out to filtering and down-sampling, obtain the sequence that length is 2048Ts, carry out 2048 point quick Fourier conversion, therefrom extract 839 former ZC sequences, multiply each other by the complex conjugate of the frequency domain sequence of the local female code of ZC sequence and the RACH frequency domain sequence of reception, carry out the inverse discrete Fourier transform of 1536, obtain PDP time domain correlation, PDP time delay correlation is got to average, carry out the setting of threshold value and the detection of peak value according to PDP average, record every section of targeting sequencing ID detecting and be partially worth when corresponding, calculate and obtain SINR.
5. a kind of accidental access signal method of sending and receiving that is applied to large coverage according to claim 1, is characterized in that: when described, calibration comprises three kinds of modes partially:
The first: remove the testing result of N+2 section, in the time that same leading ID occurs in the parallel peak value of front N+1 detects, when initial, inclined to one side value does not need calibration, when initial partially value as finally report time be partially worth;
The second: the testing result of removing N+2 section, when same leading ID is at 1...M(M=1...N) the not appearance in detecting of individual peak value, and while occurring in remaining N+1-M peak value detects, value adds that M*24576Ts obtains calibration value partially when initial, using calibration value as finally report time be partially worth;
The third: remove the testing result of N+2 section, in the time that same leading ID does not occur in N+1 peak value detects, time delay is excessive to be caused random access failure or not to send out this leading ID.
6. a kind of accidental access signal method of sending and receiving that is applied to large coverage according to claim 1, is characterized in that: described SINR value is the PDP peak energy in detection window and total PDP energy ratio.
7. a kind of accidental access signal method of sending and receiving that is applied to large coverage according to claim 6, is characterized in that: described PDP peak energy is that PDP peak maximum energy adds near the energy of putting upward peak.
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