CN102892207B - A kind of detection method of Physical Random Access Channel - Google Patents
A kind of detection method of Physical Random Access Channel Download PDFInfo
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- CN102892207B CN102892207B CN201110206921.XA CN201110206921A CN102892207B CN 102892207 B CN102892207 B CN 102892207B CN 201110206921 A CN201110206921 A CN 201110206921A CN 102892207 B CN102892207 B CN 102892207B
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- 238000001514 detection method Methods 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 claims abstract description 17
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Abstract
The invention provides a kind of detection method of Physical Random Access Channel, the method comprises: determine the current detection window having peak value; For the detection window w having peak value described in each
i, according to this detection window w
ithe energy of the preset range fringe region of side, middle ceiling capacity sliding window place, and the detection window w adjacent with this side
jin the energy of fringe region of the described scope adjacent with this side, determine this detection window w
iin whether there is random access lead code information.The detection method of the Physical Random Access Channel that the present invention proposes, effectively can overcome " false-alarm " problem when Physical Random Access Channel detects.
Description
Technical field
The present invention relates to the radio access technology in mobile communication system, particularly relate to a kind of detection method of Physical Random Access Channel.
Background technology
In a wireless communication system, a subscriber equipment (UE) only has after its uplink transmission time is synchronous, just can be scheduled and carry out uplink.Therefore, the interface of Orthogonal transmission schemes that LTE Random Access Channel (RACH) accesses as asynchronous UE and LTE up-link wireless plays crucial role.
In LTE, RACH is mainly used in initialization network insertion, does not also obtain or the user that lost uplink synchronous realizes up Timing Synchronization for those.Once user completes uplink synchronous, base station (eNodeB) can be its dispatching uplink quadrature synchronization resource.Therefore, the associated scenario of RACH use is as follows.
1) UE under RRC_CONNECTED state, but also do not obtain uplink synchronous, need to send new upstream data and control information.
2) UE under RRC_CONNECTED state, but also non-uplink synchronous, need to receive new downlink data, thus at the corresponding ACK/NACK of uplink.
3) UE under RRC_CONNECTED state, is in the switching state from the community served to Target cell.
4) conversion of state from RRC_IDLE to RRC_CONNECTED, such as initial access or tracking area update.
5) recover from radio link failure state.
All random access procedure will be triggered in above scene.LTE random access procedure has two kinds of patterns, namely allows the access of the access of " based on competition " (implicit inherent collision risk) or " non-competing ".In above-mentioned two kinds of access procedures, all need first in uplink random accesses channel (PRACH), to send random access lead code (Preamble) to base station (eNB) by UE, then the Preamble code in Random Access Channel detected when base station after, structure accidental access response (RAR) message, sends to UE by DL-SCH channel by this accidental access response message.In said process, accidental access response is exactly the feedback that physical layer detects the preamble sequence that UE sends, and detects also known as Prach.The correctness that Prach detects, determines the success rate of Stochastic accessing.
In LTE system, the Zadoff-Chu sequence that PRACH preamble signal adopts is defined as:
Wherein, N
zCrepresent sequence length, 839 and 139 are equaled respectively for Stochastic accessing form 0-3 and 4; U represents physics root parameter, and span is u ∈ [1, N
zC-1].
User's random access lead code is produced by the signature sequence modulation of representative of consumer information.The random access lead code of user both can produce in time domain, also can produce at frequency domain.Comparatively speaking, the frequency domain producing method of random access lead code realize difficulty than time domain produce slightly low.And be more conducive to the correlation reception of random access lead code.
Zadoff-Chu sequence has the superperformance of desirable auto-correlation (ACF) and permanent mould cross-correlation (CCF), by the random access sequence adopted as LTE system.Different users is distinguished by different cyclic shifts (Ncs), namely uses the different orthogonal code of the ZC code produced from same parameter to carry out user's differentiation.Utilize the above-mentioned characteristic of Zadoff-Chu sequence, whether eNodeB is detected by division detection window has user to initiate Stochastic accessing.
Current Prach detection method is noise variance threshold judgement method, the energy of the method statistics current detection sequence estimates noise variance, and then the thresholding of detection peak is determined according to noise variance threshold coefficient, finally utilize this thresholding to adjudicate whether there being lead code in each detection window.。
In PRACH detects, size and the detection window length of cyclic shift are closely related.When the cyclic shift of system configuration is less, detection window length is too short.This can cause the reduction of accuracy of detection and timing accuracy, thus there is the problem of " undetected ".For " undetected " problem, usually adopting the mode of frequency domain zero padding when doing sequence correlation computations, being namely equivalent to time domain carry out interpolation to correlated series, to improve accuracy of detection.
But, in test and actual application, when adopting the mode of frequency domain zero padding, the leakage due to inverse Fourier Tranform (IDFT) can be caused, peak energy in the detection window at random access lead code place is not only appeared in this detection window, also appearing in adjacent does not have in the detection window of random access lead code, the problem of " bimodal " namely detected.
The appearance of " bimodal ", will cause the problem that there is " false-alarm ".So-called " false-alarm " namely only has 1 UE to send random access lead code, but eNodeB has detected 2 or multiple UE transmission random access lead code, and UE is notified in accidental access response message, like this, eNodeB can reserve resource for one or more users of " not existing ".Resource is once after reserved, and eNodeB will wait in maximum time response window the message 3 (Msg3) that " false-alarm " user sends, thus not only can extend the utilance that SRT also can reduce system resource.
Summary of the invention
In view of this, main purpose of the present invention is the detection method providing a kind of Physical Random Access Channel, and the method effectively can overcome " false-alarm " problem when PRACH detects.
In order to achieve the above object, the technical scheme that the present invention proposes is:
A detection method for Physical Random Access Channel, the method comprises the following steps:
A, determine the detection window having peak value in present physical Random Access Channel sense cycle;
B, for the detection window w having peak value described in each
i, according to this detection window w
ithe energy of the preset range fringe region of side, middle ceiling capacity sliding window place, and the detection window w adjacent with this side
jin the energy of fringe region of the described scope adjacent with this side, determine this detection window w
iin whether there is random access lead code information.
In sum, the detection method of the Physical Random Access Channel that the present invention proposes, on the basis of detection window determining peak value, further according to the fringe region energy of detection window and adjacent detection window, determine eachly have in the detection window of peak value whether there is random access lead code information, effectively can avoid the false-alarm problem caused by the appearance of " bimodal ".
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the embodiment of the present invention one.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Core concept of the present invention is: on the detection method basis of existing Physical Random Access Channel, eachly the detection window of peak value is had to detect to obtained, utilize the rim detection amount of detection window to adjudicate in this detection window whether there is random access lead code during detection, to reduce " false-alarm ".
Fig. 1 is the schematic flow sheet of one embodiment of the invention.As shown in Figure 1, this embodiment comprises:
Step 101, determine the detection window having peak value in current Random Access Channel sense cycle.
In current system, common prach sense cycle is 5ms, has 64 detection window to need to detect in every 5ms.
Preferably, according to existing noise variance threshold judgement method, can determine the detection window having peak value in the current detection cycle, concrete grammar is grasped by those skilled in the art, does not repeat them here.
Step 102, for the detection window w having peak value described in each
i, according to this detection window w
ithe energy of the preset range fringe region of side, middle ceiling capacity sliding window place, and the detection window w adjacent with this side
jin the energy of fringe region of the described scope adjacent with this side, determine this detection window w
iin whether there is random access lead code information.
In this step, by determining the energy of the fringe region of side, ceiling capacity sliding window place in detection window, and the energy of the adjacent edge region of corresponding adjacent detection window, come further to the detection window w having peak value
iin whether there is random access lead code information and adjudicate, effectively can avoid the false-alarm problem caused by the appearance of " bimodal ".
Here, the size of described preset range, can limit N number of point of detection window, N is positive integer, and the accuracy that the value of N greatly then detects can increase, but algorithm complex also can increase simultaneously, and concrete those skilled in the art can set according to actual needs.
Preferably, this step can adopt following step to realize:
Determine detection window w
ithe side at middle ceiling capacity sliding window place, determines described detection window w
idescribed in the ENERGY E of fringe region of preset range of side
i_ex, and the detection window w adjacent with this side
jin the ENERGY E of fringe region of the described scope adjacent with this side
j_ex; According to described E
i_exwith described E
j_ex, determine described detection window w
iin whether there is random access lead code information.
Particularly, as detection window w
iwhen the side at middle ceiling capacity sliding window place is left side, then E
i_exfor detection window w
ithe energy of the fringe region of the preset range in middle left side, E
j_exfor detection window w
ithe adjacent detection window w in left side
jthe energy of the fringe region of the described scope on middle right side.
As detection window w
iwhen the side at middle ceiling capacity sliding window place is right side, then E
i_exfor detection window w
ithe energy of the fringe region of the preset range on middle right side, E
j_exfor detection window w
ithe adjacent detection window w on right side
jthe energy of the fringe region of the described scope in middle left side.
Preferably, according to described E
i_exwith described E
j_ex, determine described detection window w
iin whether there is random access lead code information following step can be adopted to realize:
If described E
i_exbe greater than described E
j_ex, then described detection window w is determined
iin there is random access lead code information;
If described E
i_exbe less than described E
j_ex, then described detection window w is determined
iin there is not random access lead code information;
If described E
i_exequal described E
j_ex, then according to described detection window w
ienergy summation and described detection window w
jenergy summation, determine described detection window w
iin whether there is random access lead code information.
Preferably, as described E
i_exequal described E
j_extime, following method determination detection window w can be adopted
iin whether there is random access lead code information:
If described detection window w
ienergy summation be less than described detection window w
jenergy summation, then determine described detection window w
iin there is not random access lead code information, otherwise, determine described detection window w
iin there is random access lead code information;
If described detection window w
ienergy summation be more than or equal to described detection window w
jenergy summation, then determine described detection window w
iin there is random access lead code information.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a detection method for Physical Random Access Channel, is characterized in that, the method comprises the following steps:
A, determine the detection window having peak value in present physical Random Access Channel PRACH sense cycle;
B, for the detection window w having peak value described in each
i, according to this detection window w
ithe energy of the fringe region of the preset range of side, middle ceiling capacity sliding window place, and the detection window w adjacent with this side
jin the energy of fringe region of the described scope adjacent with this side, determine this detection window w
iin whether there is random access lead code information;
Wherein, describedly this detection window w is determined
iin whether there is random access lead code information and be:
Determine this detection window w
ithe side at middle ceiling capacity sliding window place, determines described detection window w
idescribed in the ENERGY E of fringe region of preset range of side
i_ex, and the detection window w adjacent with this side
jin the ENERGY E of fringe region of the described scope adjacent with this side
j_ex; According to described E
i_exwith described E
j_ex, determine described detection window w
iin whether there is random access lead code information;
Described according to described E
i_exwith described E
j_ex, determine described detection window w
iin whether there is random access lead code information and comprise:
If described E
i_exbe greater than described E
j_ex, then described detection window w is determined
iin there is random access lead code information;
If described E
i_exbe less than described E
j_ex, then described detection window w is determined
iin there is not random access lead code information;
If described E
i_exequal described E
j_ex, then according to described detection window w
ienergy summation and described detection window w
jenergy summation, determine described detection window w
iin whether there is random access lead code information.
2. method according to claim 1, is characterized in that, described according to described detection window w
ienergy summation and described detection window w
jenergy summation, determine described detection window w
iin whether there is random access lead code information and comprise:
If described detection window w
ienergy summation be less than described detection window w
jenergy summation, then determine described detection window w
iin there is not random access lead code information, otherwise, determine described detection window w
iin there is random access lead code information.
3. method according to claim 2, is characterized in that, described according to described detection window w
ienergy summation and described detection window w
jenergy summation, determine described detection window w
iin whether there is random access lead code information and comprise:
If described detection window w
ienergy summation be more than or equal to described detection window w
jenergy summation, then determine described detection window w
iin there is random access lead code information.
4. method according to claim 1, is characterized in that, according to noise variance threshold judgement method, has the detection window of peak value described in determining.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1677909A (en) * | 2004-03-31 | 2005-10-05 | 清华大学 | Frame synchronizing method for time-domain synchronous orthogonal frequency-division duplex receiver and system |
| CN101295999A (en) * | 2008-06-27 | 2008-10-29 | 中兴通讯股份有限公司 | Detection method for accidental precursor access |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1677909A (en) * | 2004-03-31 | 2005-10-05 | 清华大学 | Frame synchronizing method for time-domain synchronous orthogonal frequency-division duplex receiver and system |
| CN101295999A (en) * | 2008-06-27 | 2008-10-29 | 中兴通讯股份有限公司 | Detection method for accidental precursor access |
Non-Patent Citations (1)
| Title |
|---|
| 一种基于LTE随机接人前导检测的实现方案;陈发堂 等;《光通信研究》;20110630;全文 * |
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