CN101378279B - Method and apparatus for obtaining propagation delay from physical stochastic access channel - Google Patents
Method and apparatus for obtaining propagation delay from physical stochastic access channel Download PDFInfo
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- CN101378279B CN101378279B CN2007101455767A CN200710145576A CN101378279B CN 101378279 B CN101378279 B CN 101378279B CN 2007101455767 A CN2007101455767 A CN 2007101455767A CN 200710145576 A CN200710145576 A CN 200710145576A CN 101378279 B CN101378279 B CN 101378279B
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Abstract
The invention discloses a method and a device for obtaining propagation delay from a physical random access channel, wherein, the method comprises the following treatments: Node B descrambles an input signal, the relevant energy value of different delay positions of each signature is obtained by predefined processing; in random access preamble detection, demodulation random access information with the largest energy of N multipaths is selected for the signature which is judged to be valid; the demodulation energy of each pilot symbol in the information control parts of M frames of information after demodulation is respectively accumulated for the N multipath, wherein, M equals to 1 or 2; air interface one-way delay corresponding to the multipath with the largest demodulation energy in the N multipath is selected as the propagation delay which is reported to a radio network controller. The invention can effectively prevent the interference of a noise path and avoid the occurrence of the situation that the energy of the noise path exceeds that of a real path, thus solving the problem that the reported propagation delay is not accurate.
Description
Technical field
The present invention relates to WCDMA (WCDMA, Wideband Code-DivisionMultiple-Access) communication system, relate in particular in the broadband CDMA system method and the device that obtain propagation delay from Physical Random Access Channel.
Background technology
In WCDMA (WCDMA) GSM; When mobile phone initiated to insert at random, base station (Node B) can obtain the one way propagation time delay (Propagation Delay) of air interface from Physical Random Access Channel (PRACH), and this propagation delay is reported radio network controller (RNC; Radio Network Controller); When setting up dedicated channel subsequently, RNC can be handed down to Node B with the propagation delay value that reports as required.
If the dedicated channel that RNC issues is set up and is not with propagation delay (Propagation Delay) parameter in the signaling; Node B is when this dedicated channel of demodulation; Need in RAKE receiver, dispose a big multipath search window, carry out Multipath searching in whole cell range; Otherwise; Have propagation delay (PropagationDelay) parameter in the signaling if dedicated channel is set up, Node B can be with this propagation delay as benchmark, configuration multipath search window original position; Carry out Multipath searching with a less multipath search window, thereby save searching resource.
At present; When Node B random access guiding detects; To the leading descrambling that carries out,, obtain the correlation energy value of the different delay positions of each signature through separating signature and the correlation product processing that grades; Relatively carry out the access lead judgement with wherein maximum energy value and detection of preamble thresholding then; To adjudicating effective signature, utilize the correlation energy value of different delay positions to carry out Multipath searching, and choose the corresponding air interface one way propagation time delay of the maximum multipath of correlation energy value and report RNC as propagation delay (Propagation Delay).Because leading part length is 4096chip, correlation intergal length is the longest to be 4096chip, and the Ec/Io of the mobile phone accidental access signal that receives as Node B is lower; In the time of near the detection of preamble thresholding, the maximum multipath of the correlation energy value of choosing might be a noise path, and the propagation delay that obtains like this is just inaccurate; If error is bigger; Utilize this propagation delay that search window is set when dedicated channel is set up and just can't search true footpath, cause the dedicated channel can't be synchronous, the mobile phone access failure.Fig. 1 shows under the situation that adopts said method, the corresponding relation figure of leading Ec/Io and propagation delay error probability.
Summary of the invention
Consider the problem that can't obtain propagation delay accurately that exists in the prior art and propose the present invention, for this reason, the present invention aims to provide a kind of method and apparatus that obtains propagation delay from Physical Random Access Channel.
Method from Physical Random Access Channel acquisition propagation delay according to the present invention comprises following processing: Node B carries out descrambling to the signal of input, obtains the correlation energy value of the different delay positions of each signature through predetermined process; In random access guiding detects, effectively sign for judgement, choose the maximum N bar multi-path demodulation random accessing message of correlation energy value; For N bar multipath, the demodulation energy of each frequency pilot sign in the message control section of M frame message after the demodulation that adds up respectively, wherein, M=1 or 2; The corresponding air interface One Way Delay of multipath of choosing demodulation energy maximum in the N bar multipath reports radio network controller as propagation delay.
Above-mentioned predetermined process comprises: separate signature and correlation intergal.
Before selecting N bar multipath, effectively sign for judgement, at first utilize the correlation energy value of different delay positions to carry out Multipath searching.Like this, N is for greater than 1 and less than the natural number of the quantity of the multipath that searches.
Device from Physical Random Access Channel acquisition propagation delay according to the present invention comprises: descrambling portion is used for the signal of input is carried out descrambling, and obtains the correlation energy value of the different delay positions of each signature through predetermined process; Multipath selection portion is used for detecting at random access guiding, effectively signs for judgement, chooses the maximum N bar multi-path demodulation random accessing message of correlation energy value; Energy accumulation portion, for the N bar multipath that multipath selection portion is selected, the demodulation energy of each frequency pilot sign in the message control section of M frame message after the demodulation that adds up respectively, wherein, M=1 or 2; Propagation delay obtains portion, is used for choosing the corresponding air interface One Way Delay of the maximum multipath of N bar multipath demodulation energy and reports radio network controller as propagation delay.
Above-mentioned predetermined process comprises: separate signature and correlation intergal.
Before selecting N bar multipath, effectively to sign for judgement, multipath selects radicals by which characters are arranged in traditional Chinese dictionaries to utilize the correlation energy value of different delay positions to carry out Multipath searching earlier.Like this, N is for greater than 1 and less than the natural number of the quantity of the multipath that searches.
Through the present invention, can effectively prevent the interference of noise path, avoid occurring the situation that the noise path energy surpasses true footpath, thereby solve the inaccurate problem of propagation delay that reports.
Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the corresponding relation sketch map of Ec/Io and propagation delay error probability in the prior art;
Fig. 2 is the sketch map according to the physical random cut-in channel frame structure of correlation technique;
Fig. 3 obtains the flow chart of the method for propagation delay according to the embodiment of the invention from Physical Random Access Channel;
Fig. 4 obtains the block diagram of the device of propagation delay according to the embodiment of the invention from Physical Random Access Channel.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.
Before describing the embodiment of the invention; At first introduce the frame structure of Physical Random Access Channel, as shown in Figure 2, Physical Random Access Channel is divided into leading part and message part; Leading part length is 4096chip; Message part length is a frame or two frames, 15 time slots of every frame, each time slot 2560chip.
In embodiments of the present invention; Judgement in the detection of preamble is effectively signed; Choose the maximum N bar multi-path demodulation random accessing message of energy,, get the corresponding time-delay calculation propagation delay of the maximum multipath of demodulation energy the add up energy of each frequency pilot sign of message control section after the demodulation of every multipath.Below will describe the present invention in detail.
Method embodiment
According to the inventive method embodiment, a kind of method that obtains propagation delay from Physical Random Access Channel is provided.
As shown in Figure 3, this method can comprise following processing:
Step S302, Node B carries out descrambling to the signal of input, obtains the correlation energy value of the different delay positions of each signature through predetermined process (for example, separating signature and correlation intergal);
Step S304 in random access guiding detects, effectively signs for judgement, at first utilizes the correlation energy value of different delay positions to carry out Multipath searching, afterwards, chooses the maximum N bar multi-path demodulation random accessing message of energy; N is for greater than 1 and less than the natural number of the quantity of the multipath that searches;
Step S306, for N bar multipath, the demodulation energy of each frequency pilot sign in the message control section of 1 frame or 2 frame messages after the demodulation that adds up respectively;
Step S308, the corresponding air interface One Way Delay of multipath of choosing demodulation energy maximum in the N bar multipath reports radio network controller as propagation delay.
Device embodiment
According to apparatus of the present invention embodiment, a kind of device that obtains propagation delay from Physical Random Access Channel is provided.
As shown in Figure 4, this device comprises: descrambling portion 402 is used for the signal of input is carried out descrambling, and obtains the correlation energy value of the different delay positions of each signature through predetermined process; Multipath selection portion 404 is used for detecting at random access guiding, effectively signs for judgement, chooses the maximum N bar multi-path demodulation random accessing message of correlation energy value; Energy accumulation portion 406, for the N bar multipath that multipath selection portion is selected, the demodulation energy of each frequency pilot sign in the message control section of M frame message after the demodulation that adds up respectively, wherein, M=1 or 2; Propagation delay obtains portion 408, is used for choosing the corresponding air interface One Way Delay of the maximum multipath of N bar multipath demodulation energy and reports radio network controller as propagation delay.
Before selecting N bar multipath, effectively to sign for judgement, multipath selection portion 404 at first utilizes the correlation energy value of different delay positions to carry out Multipath searching.Like this, N is for greater than 1 and less than the natural number of the quantity of the multipath that searches.
Because message part length is a frame or two frames; Therefore, through technical scheme provided by the invention, can get the message control section sign computation demodulation energy of a frame or two frames; Increased integration lengths greatly; Can effectively prevent the interference of noise path, avoid occurring the situation that the noise path energy surpasses true footpath, thereby solve the inaccurate problem of propagation delay that reports.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the method from Physical Random Access Channel acquisition propagation delay is characterized in that, comprising:
Node B carries out descrambling to the signal of input, obtains the correlation energy value of the different delay positions of each signature through predetermined process;
In random access guiding detects, for the effective signature of judgement, choose the maximum N bar multi-path demodulation random accessing message of said correlation energy value, wherein, N is for greater than 1 and less than the natural number of the quantity of the multipath that searches;
For said N bar multipath, the demodulation energy of each frequency pilot sign in the message control section of M frame message after the demodulation that adds up respectively, wherein, M=1 or 2; And
Choose the corresponding air interface One Way Delay of the maximum multipath of demodulation energy described in the said N bar multipath and report radio network controller as propagation delay.
2. method according to claim 1 is characterized in that, said predetermined process comprises: separate signature and correlation intergal.
3. method according to claim 1 is characterized in that, before selecting said N bar multipath, for the effective said signature of judgement, at first utilizes the correlation energy value of said different delay positions to carry out Multipath searching.
4. the device from Physical Random Access Channel acquisition propagation delay is characterized in that, comprising:
Descrambling portion is used for the signal of input is carried out descrambling, and obtains the correlation energy value of the different delay positions of each signature through predetermined process;
Multipath selection portion is used for detecting at random access guiding, for the effective signature of judgement, chooses the maximum N bar multi-path demodulation random accessing message of said correlation energy value, and wherein, N is for greater than 1 and less than the natural number of the quantity of the multipath that searches;
Energy accumulation portion, for the said N bar multipath that said multipath selection portion is selected, the demodulation energy of each frequency pilot sign in the message control section of M frame message after the demodulation that adds up respectively, wherein, M=1 or 2;
Propagation delay obtains portion, is used to choose the corresponding air interface One Way Delay of the maximum multipath of demodulation energy described in the said N bar multipath and reports radio network controller as propagation delay.
5. device according to claim 4 is characterized in that, said predetermined process comprises: separate signature and correlation intergal.
6. device according to claim 4 is characterized in that, before selecting said N bar multipath, for the effective said signature of judgement, said multipath selects radicals by which characters are arranged in traditional Chinese dictionaries to utilize the correlation energy value of said different delay positions to carry out Multipath searching earlier.
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| CN2007101455767A CN101378279B (en) | 2007-08-28 | 2007-08-28 | Method and apparatus for obtaining propagation delay from physical stochastic access channel |
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| CN2007101455767A CN101378279B (en) | 2007-08-28 | 2007-08-28 | Method and apparatus for obtaining propagation delay from physical stochastic access channel |
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| CN101378279B true CN101378279B (en) | 2012-07-04 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1731887A (en) * | 2004-08-04 | 2006-02-08 | 中兴通讯股份有限公司 | CDMA system random access threshold multi-path selection method |
| CN1909710A (en) * | 2006-08-09 | 2007-02-07 | 华为技术有限公司 | Method and device for processing transmission time delay in wide shrouding |
| CN1925363A (en) * | 2005-08-31 | 2007-03-07 | 华为技术有限公司 | Method and device for realizing physical random switch-in channel transmission time delay under wide covering |
| CN1968202A (en) * | 2006-06-13 | 2007-05-23 | 华为技术有限公司 | Transmission method against physical random access channel transmission delay |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1731887A (en) * | 2004-08-04 | 2006-02-08 | 中兴通讯股份有限公司 | CDMA system random access threshold multi-path selection method |
| CN1925363A (en) * | 2005-08-31 | 2007-03-07 | 华为技术有限公司 | Method and device for realizing physical random switch-in channel transmission time delay under wide covering |
| CN1968202A (en) * | 2006-06-13 | 2007-05-23 | 华为技术有限公司 | Transmission method against physical random access channel transmission delay |
| CN1909710A (en) * | 2006-08-09 | 2007-02-07 | 华为技术有限公司 | Method and device for processing transmission time delay in wide shrouding |
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