CN102892207A - Detection method for physical random access channel - Google Patents
Detection method for physical random access channel Download PDFInfo
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- CN102892207A CN102892207A CN201110206921XA CN201110206921A CN102892207A CN 102892207 A CN102892207 A CN 102892207A CN 201110206921X A CN201110206921X A CN 201110206921XA CN 201110206921 A CN201110206921 A CN 201110206921A CN 102892207 A CN102892207 A CN 102892207A
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- 238000001514 detection method Methods 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 claims description 20
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- 230000004044 response Effects 0.000 description 5
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Abstract
The invention provides a detection method for a physical random access channel. The detection method comprises the following steps of: determining detection windows with a peak value currently; and for each detection window wi with a peak value, determining whether random access lead code information exists in the detection window wi according to energy of an edge region in a preset range at one side where the maximum energy sliding window is located in the detection window wi and the energy of the edge region in the range adjacent to the side in a detection window wj adjacent to the side. The detection method for the physical random access channel provided by the invention can effectively overcome the problem of 'false alarm' in physical random access channel detection.
Description
Technical field
The present invention relates to the random access technology in the mobile communication system, particularly relate to a kind of detection method of Physical Random Access Channel.
Background technology
In wireless communication system, a subscriber equipment (UE) only has after its uplink time synchronized, just can be scheduled and carry out uplink.Therefore, LTE Random Access Channel (RACH) has been played the part of crucial role as the interface of the orthogonal transmission scheme of asynchronous UE and the access of LTE up-link wireless.
In LTE, RACH is mainly used in the initialization network insertion, for those also do not obtain or the user that lost uplink synchronous realizes up Timing Synchronization.In case the user finishes 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 the RRC_CONNECTED state, but also do not obtain uplink synchronous, need to send new upstream data and control information.
2) UE under the RRC_CONNECTED state, but uplink synchronous not also need to receive new downlink data, thereby at the corresponding ACK/NACK of uplink.
3) UE under the RRC_CONNECTED state is in from the residential quarter served to the switching state of Target cell.
4) conversion from RRC_IDLE to the RRC_CONNECTED state is such as initial access or tracking area update.
5) under the radio link failure state, recover.
All to trigger random access procedure in above scene.The LTE random access procedure has two kinds of patterns, namely allows the access (implicit inherent collision risk) of " based on competition " or the access of " non-competing ".In above-mentioned two kinds of access procedures, all need to be accessed at uplink random by UE first to send random access lead code (Preamble) in the channel (PRACH) to base station (eNB), then after the base station detects Preamble code in the Random Access Channel, structure accidental access response (RAR) message sends to UE by the DL-SCH channel with this accidental access response message.In the said process, the feedback that the accidental access response preamble sequence that to be exactly physical layer send UE detects claims again Prach to detect.The correctness that Prach detects has determined the success rate of random access.
In the LTE system, the Zadoff-Chu sequence definition that PRACH preamble signal adopts is:
Wherein, N
ZCThe expression sequence length equals respectively 839 and 139 for random access 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 to modulate by the signature sequence of representative of consumer information to produce.User's random access lead code both can produce in time domain, also can produce at frequency domain.Comparatively speaking, the frequency domain producing method of random access lead code realizes that difficulty produces slightly low than time domain.And more be conducive to the correlation reception of random access lead code.
The Zadoff-Chu sequence has the superperformance of desirable auto-correlation (ACF) and permanent mould cross-correlation (CCF), is adopted the random access sequence as the LTE system.Different users distinguishes by different cyclic shift (Ncs), namely uses the different orthogonal code from the ZC code of same parameter generating to carry out user's differentiation.Utilize the above-mentioned characteristic of Zadoff-Chu sequence, whether eNodeB detects by the division detection window has the user to initiate random access.
Present Prach detection method is noise variance threshold judgement method, the energy of the method statistics current detection sequence estimates noise variance, and then determine according to noise variance thresholding coefficient the thresholding of detection peak to utilize at last this thresholding to whether there being lead code to adjudicate in each detection window.。
In PRACH detected, the size of cyclic shift and detection window length were closely related.When the cyclic shift of system configuration hour, detection window length is too short.This can cause the reduction of accuracy of detection and timing accuracy, thereby has the problem of " undetected ".For " undetected " problem, usually doing the mode that adopts the frequency domain zero padding when Serial relation calculates, namely be equivalent on the time domain correlated series be carried out interpolation, to improve accuracy of detection.
But, in test and actual application, when adopting the mode of frequency domain zero padding, can cause because the leakage of contrary Fourier Tranform (IDFT), so that the peak energy in the detection window at random access lead code place not only appears in this detection window, also can appear at the adjacent detection window that does not have random access lead code in, namely detect the problem of " bimodal ".
The appearance of " bimodal " will cause existing the problem of " false-alarm ".So-called " false-alarm " namely only has 1 UE to send random access lead code, but eNodeB has detected 2 or a plurality of UE transmission random access lead code, and in accidental access response message, notify UE, like this, eNodeB can reserve resource for one or more users of " not existing ".Resource is in case after reserving, eNodeB will wait for the message 3 (Msg3) that " false-alarm " user sends in the maximum time response window, thereby not only can prolong the utilance that SRT also can reduce system resource.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of detection method of Physical Random Access Channel, " false-alarm " problem when the method can effectively overcome the PRACH detection.
In order to achieve the above object, the technical scheme of the present invention's proposition is:
A kind of detection method of Physical Random Access Channel, the method may further comprise the steps:
A, determine to have in the current Physical Random Access Channel sense cycle detection window of peak value;
B, for each described detection window w that peak value is arranged
i, according to this detection window w
iThe energy of the preset range fringe region of middle ceiling capacity sliding window place side, 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 have 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 the detection window of determining peak value, further according to the fringe region energy of detection window and adjacent detection window, determine whether there is random access lead code information in each detection window that peak value is arranged, can effectively avoid because the caused false-alarm problem of appearance of " bimodal ".
Description of drawings
Fig. 1 is the schematic flow sheet of the embodiment of the invention one.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, 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, to resulting each have the detection window of peak value to detect, utilize the rim detection amount of detection window to adjudicate whether there is random access lead code in this detection window 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:
In the system, common prach sense cycle is 5ms at present, has 64 detection window to need to detect among every 5ms.
Preferably, can determine that current detection has the detection window of peak value in the cycle according to existing noise variance threshold judgement method, concrete grammar is grasped by those skilled in the art, does not repeat them here.
In this step, by the energy of the fringe region of ceiling capacity sliding window place side in definite detection window, and the energy in the neighboring edge zone of corresponding adjacent detection window, come further to the detection window w of peak value is arranged
iIn whether exist random access lead code information to adjudicate, can effectively avoid because the caused false-alarm problem of appearance of " bimodal ".
Here, the size of described preset range can limit N point of detection window, and N is positive integer, and the large accuracy that then detects of the value of N 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
iOne side at middle ceiling capacity sliding window place is determined 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_exAccording to described E
I_exWith described E
J_ex, determine described detection window w
iIn whether have random access lead code information.
Particularly, as detection window w
iWhen one side at middle ceiling capacity sliding window place is the left side, E then
I_exBe detection window w
iThe energy of the fringe region of the preset range in middle left side, E
J_exBe 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 one side at middle ceiling capacity sliding window place is the right side, E then
I_exBe detection window w
iThe energy of the fringe region of the preset range on middle right side, E
J_exBe 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 exist random access lead code information can adopt following step to realize:
If described E
I_exGreater than described E
J_ex, then determine described detection window w
iIn have random access lead code information;
If described E
I_exLess than described E
J_ex, then determine described detection window w
iIn do not have 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
jThe energy summation, determine described detection window w
iIn whether have random access lead code information.
Preferably, as described E
I_exEqual described E
J_exThe time, can adopt following method to determine detection window w
iIn whether have random access lead code information:
If described detection window w
iThe energy summation less than described detection window w
jThe energy summation, then determine described detection window w
iIn do not have random access lead code information, otherwise, determine described detection window w
iIn have random access lead code information;
If described detection window w
iThe energy summation more than or equal to described detection window w
jThe energy summation, then determine described detection window w
iIn have random access lead code information.
In sum, above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the detection method of a Physical Random Access Channel is characterized in that, the method may further comprise the steps:
A, determine to have in the current Physical Random Access Channel PRACH sense cycle detection window of peak value;
B, for each described detection window w that peak value is arranged
i, according to this detection window w
iThe energy of the fringe region of the preset range of middle ceiling capacity sliding window place side, 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 have random access lead code information.
2. method according to claim 1 is characterized in that, described definite this detection window w
iIn whether exist random access lead code information to be:
Determine this detection window w
iOne side at middle ceiling capacity sliding window place is determined 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_exAccording to described E
I_exWith described E
J_ex, determine described detection window w
iIn whether have random access lead code information.
3. method according to claim 2 is characterized in that, and is described according to described E
I_exWith described E
J_ex, determine described detection window w
iIn whether exist random access lead code information to comprise:
If described E
I_exGreater than described E
J_ex, then determine described detection window w
iIn have random access lead code information.
4. method according to claim 2 is characterized in that, and is described according to described E
I_exWith described E
J_ex, determine described detection window w
iIn whether exist random access lead code information to comprise:
If described E
I_exLess than described E
J_ex, then determine described detection window w
iIn do not have random access lead code information.
5. method according to claim 2 is characterized in that, and is described according to described E
I_exWith described E
J_ex, determine described detection window w
iIn whether exist random access lead code information to comprise:
If described E
I_exEqual described E
J_ex, then according to described detection window w
iEnergy summation and described detection window w
jThe energy summation, determine described detection window w
iIn whether have random access lead code information.
6. method according to claim 5 is characterized in that, and is described according to described detection window w
iEnergy summation and described detection window w
jThe energy summation, determine described detection window w
iIn whether exist random access lead code information to comprise:
If described detection window w
iThe energy summation less than described detection window w
jThe energy summation, then determine described detection window w
iIn do not have random access lead code information, otherwise, determine described detection window w
iIn have random access lead code information.
7. method according to claim 5 is characterized in that, and is described according to described detection window w
iEnergy summation and described detection window w
jThe energy summation, determine described detection window w
iIn whether exist random access lead code information to comprise:
If described detection window w
iThe energy summation more than or equal to described detection window w
jThe energy summation, then determine described detection window w
iIn have random access lead code information.
8. method according to claim 1 is characterized in that, according to noise variance threshold judgement method, determines the described detection window that peak value is arranged.
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| CN201110206921.XA CN102892207B (en) | 2011-07-22 | 2011-07-22 | A kind of detection method of Physical Random Access Channel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104053244A (en) * | 2013-03-12 | 2014-09-17 | 普天信息技术研究院有限公司 | Random access method |
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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Patent 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 |
Non-Patent Citations (1)
| Title |
|---|
| 陈发堂 等: "一种基于LTE随机接人前导检测的实现方案", 《光通信研究》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104053244A (en) * | 2013-03-12 | 2014-09-17 | 普天信息技术研究院有限公司 | Random access method |
| CN104053244B (en) * | 2013-03-12 | 2018-11-23 | 普天信息技术研究院有限公司 | A kind of accidental access method |
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