CN1731887A - CDMA system random access threshold multi-path selection method - Google Patents

CDMA system random access threshold multi-path selection method Download PDF

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Publication number
CN1731887A
CN1731887A CNA2004100701652A CN200410070165A CN1731887A CN 1731887 A CN1731887 A CN 1731887A CN A2004100701652 A CNA2004100701652 A CN A2004100701652A CN 200410070165 A CN200410070165 A CN 200410070165A CN 1731887 A CN1731887 A CN 1731887A
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multipath
signature
demodulation
thresholding
message
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CN100393168C (en
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万里龙
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ZTE Corp
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ZTE Corp
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Abstract

This invention discloses a method for choosing way of random switch in threshold of CDMA system in mobile communication field, which comprises: a, processing input signals; b, comparing the energy of every multi-path of every signature with once threshold T1; c, comparing the strongest energy of result of step b with twice threshold T2, if the strongest one is larger than T2, judging the signature valid, then doing further multi-path management, if less than T2, judging it invalid, giving up adjusting; d, adjusting information input from adjusting unit; e, statistics information adjusting error number, namely error rato; f, adjusting fore-guide testing threshold based on error ratio. The invention can guarantee there are enough multi-path to be used in adjusting message after valid signature, and guarantee false alarm enough low.

Description

CDMA system random access threshold multi-path selection method
Technical field
The present invention relates to mobile communication system, relate in particular to code division multiple access system and insert (RandomAccess) multi-path selecting method at random.
Background technology
Along with the fast development of mobile communication, people require also more and more higher to the quality of mobile communication and the type of service that provides thereof, and the proposition of 3G (Third Generation) Moblie and development have met people's this demand just, therefore get most of the attention.Wideband Code Division Multiple Access (WCDMA) (WCDMA, Wide CDMA) is a 3-G (Generation Three mobile communication system) standardization body (3 RdGeneration Partnership Project, 3GPP) the Radio Transmission Technology of Ti Chuing (Radio Transmission Technology, RTT) scheme, it not only can provide high-quality voice service, and can provide and the similar multimedia service of fixed network.
In Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, inserting at random is a very important part in the system, be subscriber equipment (User Equipment, UE, set up the prerequisite and the basis of dedicated channel when the terminal equipment in the WCDMA system) calling out after sub-district registration and registration, the performance that therefore inserts part at random seems extremely important.The multi-path selecting method that inserts at random comparatively commonly used is at present mainly selected (as shown in Figure 1) by single thresholding, and every energy all will be given the multipath administration module greater than the multipath of T2.This method implements comparatively simple, but in fact threshold T 2 selects very difficulty: if T2 is too high, detected multipath will be considerably less, and message (message part of Jie Ruing at random) demodulation performance is had a greatly reduced quality like this; If T2 is too low, then false-alarm may be again with too high, and false-alarm also will take the message demodulating unit, also might cause blocking under the serious situation, because the demodulating unit resource is very limited, thereby makes effective signature can not get demodulating unit on the contrary.
Summary of the invention
The objective of the invention is to overcome in the single gate method that prior art exists thresholding select difficulty, make a false report alert too much, shortcomings such as demodulating unit obstruction, in the hope of proposing a kind of (Signature that effectively signs among the preamble (leading part of Jie Ruing at random) that can guarantee to work as, what carry in preamble is exactly sigature information) detect after, there is abundant multipath to be used for the demodulation of message, can guarantee that again false-alarm is enough low, prevent the multi-path selecting method of access at random that choking phenomenon occurs.
For achieving the above object, the present invention proposes a kind of CDMA system random access threshold multi-path selection method, it is characterized in that, may further comprise the steps:
The first step: to input signal carry out descrambling, separate frequency deviation, separate signature, correlation product is graded processing, the power time delay that obtains leading difference signature distribute (Power Delay Profile, PDP).
Second step: the energy of each multipath of each signature and T1 (thresholding is used thresholding twice in this method, and this thresholding at first uses, and is called thresholding one time) comparison, think useful multipath greater than the multipath of T1, write down all useful multipaths.
The 3rd step: with energy and T2 (secondary thresholding, the wherein T1＜T2) comparison of the most powerful path among the result in second step.If the most powerful path energy, thinks then that this signature is effective greater than T2, and gives the multipath management with all useful multipaths that obtain in second step, the multipath that obtains after the multipath management is used for message (message part of Jie Ruing at random) demodulation; If the most powerful path energy is not more than T2, think that then this signature is invalid, the not demodulation of message (message part of Jie Ruing at random) that this signature is corresponding.
The 4th step, all useful multipaths of the 3rd step input are done further multipath management, the main processing be, when the phasetophase of two adjacent multipaths apart from less than 1chip (chip, the multipath phase unit of code division multiple access system), reject the less footpath of energy.Multipath phasetophase after the multipath management is apart from all being not less than 1chip (chip, the multipath phase unit of code division multiple access system), and the multipath after the multipath management processing distributes and to flow to message (message part of Jie Ruing at random) demodulating unit, and demodulating unit will be according to the multipath distribution demodulation message (message part of Jie Ruing at random) of this step generation.
In the 5th step, abandon the demodulation of the corresponding message of invalid signature (message part of Jie Ruing at random).
In the 6th step, demodulating unit will be according to the multipath distribution demodulation message (message part of Jie Ruing at random) of the 4th step generation.
The 7th step is according to the 6th step demodulation result, statistical message demodulation number of errors within a certain period of time, i.e. statistical message demodulation error rate.
In the 8th step, dynamically adjust the detection of preamble thresholding according to the message demodulation error rate.If error rate raises then suitably increases the detection of preamble thresholding; If error rate reduces, then suitably reduce the detection of preamble thresholding.Certainly the thresholding adjustment should have a high-low limit, prevents that this feedback control loop from dispersing, and all is disadvantageous because thresholding is too high and cross low to systematic function.
The multi-path selecting method that inserts at random of the present invention, compared with prior art, both the more multipath of effective signature utilization was come the demodulation message part, improve the message demodulation performance, guarantee that again false-alarm is lower, prevent the appearance of choking phenomenon, the method by dynamic threshold makes at random that access subsystem is operated in optimum state simultaneously.Adopt the multi-path selecting method that inserts at random set forth in the present invention, simulation result and real system test show that all the performance of Jie Ruing is significantly improved than the access performance at random of prior art at random.
Description of drawings
Fig. 1 inserts the multi-path selecting method flow chart at random in the prior art.
Fig. 2 is a CDMA system random access threshold multi-path selection method flow chart of the present invention.
Embodiment
Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical scheme, according to these accompanying drawings, the technical staff in same field can be easy to realize the present invention.
The present invention has proposed a kind of multi-path selecting method of access at random that is used for Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, the method of sampling secondary thresholding, enough multipaths are arranged when both guaranteeing message demodulation, can guarantee that again false alarm probability is enough low, improve communication system access performance at random.
Fig. 1 is the method flow diagram that inserts the multipath selection at random that prior art adopts in Wideband Code Division Multiple Access (WCDMA) (WCDMA) system.
This logical flow chart starts from step 101, ends at step 105.
Step 101, PDE (Preamble Dection Engine, the detection of preamble engine), to input signal finish descrambling (multiplying each other), separate frequency deviation (multiplying each other) with frequency offseting value with scrambler, separate signature (multiplying each other), coherent integration (by given length coherent integration) with different signatures, obtain power time delay distribution (the Power Delay Profile of 16 signatures like this, PDP), promptly obtain the energy of all multipaths of each signature.
Step 102, for each signature, with the energy and T2 (thresholding) comparison of its each multipath, energy is greater than the useful multipath of being recorded as of T2, and the multipath that is not more than T2 is given up.
Step 103, whether the energy of most powerful path that can know this signature from the result of step 102 is greater than T2, if the most powerful path energy is not more than T2, illustrate that then this signature is invalid signature, this signature is not sent AI (Access Indication, insert indication), promptly not corresponding to this signature message (message part of Jie Ruing at random) demodulation just enters step 104.If the most powerful path energy is greater than T2, illustrate that then this signature for effectively signing, sends AI (Access Indication inserts indication) to this signature, promptly corresponding to this signature message (message part of Jie Ruing at random) demodulation just enters step 105 and step 106.
Step 104 is according to the differentiation result of step 103, if invalid signature, then enter this step, promptly give up this signature, this signature is not sent AI (Access Indication, insert indication), promptly not corresponding message (message part of Jie Ruing at random) demodulation to this signature.
Step 105, differentiation result according to step 103, if effectively sign, enter this step, all useful multipaths of step 102 record are done further multipath management, and main the processing be, when the phasetophase of two adjacent multipaths apart from less than 1chip (chip, the multipath phase unit of code division multiple access system), reject the less footpath of energy.Multipath phasetophase after the multipath management is apart from all being not less than 1chip (chip, the multipath phase unit of code division multiple access system), and the multipath after the multipath management processing distributes and to flow to message (message part of Jie Ruing at random) demodulating unit, and demodulating unit will be according to the multipath distribution demodulation message (message part of Jie Ruing at random) of this step generation.
Fig. 2 is the method flow diagram that multipath is selected that inserts at random set forth in the present invention.
This logical flow chart starts from step 201, ends at step 208.
Step 201, PDE (Preamble Dection Engine, the detection of preamble engine), to input signal finish descrambling (multiplying each other), separate frequency deviation (multiplying each other) with frequency offseting value with scrambler, separate signature (multiplying each other), coherent integration (by given length coherent integration) with different signatures, obtain power time delay distribution (the Power Delay Profile of 16 signatures like this, PDP), promptly obtain the energy of all multipaths of each signature.
Step 202, for each signature, with the energy and T1 (thresholding) comparison of its each multipath, energy is greater than the useful multipath of being recorded as of T1, and the multipath that is not more than T1 is given up.
Step 203, for each signature, whether differentiate this signature according to the useful multipath of step 202 record is effective signature, if the most powerful path energy is not more than T2 (secondary thresholding, T1＜T2), illustrate that then this signature is invalid signature, this signature is not sent AI (Access Indication, insert indication), promptly not corresponding to this signature message (message part of Jie Ruing at random) demodulation just enters step 204.If the most powerful path energy, illustrates then that this signature for effectively signing, sends AI (Access Indication inserts indication) to this signature greater than T2, promptly, just enter step 205 to this corresponding message (message part of Jie Ruing at random) demodulation of signing.
Step 204 is according to the differentiation result of step 203, if invalid signature, then enter this step, promptly give up this signature, this signature is not sent AI (Access Indication, insert indication), promptly not corresponding message (message part of Jie Ruing at random) demodulation to this signature.
Step 205, differentiation result according to step 203, if effectively sign, enter this step, all useful multipaths of step 202 record are done further multipath management, and main the processing be, when the phasetophase of two adjacent multipaths apart from less than 1chip (chip, the multipath phase unit of code division multiple access system), reject the less footpath of energy.Multipath phasetophase after the multipath management is apart from all being not less than 1chip (chip, the multipath phase unit of code division multiple access system), and the multipath after the multipath management processing distributes and to flow to message (message part of Jie Ruing at random) demodulating unit, and demodulating unit will be according to the multipath distribution demodulation message (message part of Jie Ruing at random) of this step generation.
Step 206, the multipath distribution demodulation message part that management obtains according to step 205 multipath.
Step 207, according to step 206 demodulation result, statistical message demodulation error rate (the wrong sum in the certain hour).
Step 208 is dynamically adjusted the detection of preamble thresholding according to the message demodulation error rate.If error rate raises then suitably increases the detection of preamble thresholding; If error rate reduces, then suitably reduce the detection of preamble thresholding.Certainly the thresholding adjustment should have a high-low limit, prevents that this feedback control loop from dispersing, and all is disadvantageous because thresholding is too high and cross low to systematic function.

Claims (6)

1, a kind of CDMA system random access threshold multi-path selection method is characterized in that, may further comprise the steps:
The first step: to input signal carry out descrambling, separate frequency deviation, separate signature, correlation product is graded processing, the power time delay that obtains leading difference signature distributes;
Second step: the energy of each multipath of each signature and a thresholding T1 relatively think useful multipath greater than the multipath of T1, write down all useful multipaths;
The 3rd step: with the energy and the secondary thresholding T2 of the most powerful path among the result in second step; If the most powerful path energy, thinks then that this signature is effective greater than T2; If the most powerful path energy is not more than T2, think that then this signature is invalid, changeed for the 5th step;
In the 4th step, all useful multipaths of the 3rd step input are done further multipath management;
In the 5th step, abandon the demodulation of the message part that the invalid signature correspondence inserts at random;
The 6th step, the message part that demodulating unit will insert at random according to the multipath distribution demodulation that the 4th step produced;
The 7th step is according to the 6th step demodulation result, statistical message demodulation number of errors within a certain period of time, i.e. statistical message demodulation error rate;
In the 8th step, dynamically adjust the detection of preamble thresholding according to the message demodulation error rate.
2, CDMA system random access threshold multi-path selection method as claimed in claim 1 is characterized in that, the described contents processing of the first step comprises descrambling, separates frequency deviation, separates signature, correlation product is graded process.
3, CDMA system random access threshold multi-path selection method as claimed in claim 1 is characterized in that, the pass between a described thresholding T1 of second step and the secondary thresholding T2 is: T1＜T2.
4, CDMA system random access threshold multi-path selection method as claimed in claim 1 is characterized in that, the main processing described in the 4th step is:
When the phasetophase of two adjacent multipaths apart from less than 1 chip, reject the less footpath of energy;
Multipath after the multipath management processing distributes and flows to the message part demodulating unit that inserts at random, the message part that demodulating unit will insert at random according to the multipath distribution demodulation that this step produces.
5, CDMA system random access threshold multi-path selection method as claimed in claim 4 is characterized in that, the multipath phasetophase after the multipath management is apart from all being not less than 1 chip.
6, CDMA system random access threshold multi-path selection method as claimed in claim 1 is characterized in that, in the 8th step, if error rate raises then suitably increases the detection of preamble thresholding; If error rate reduces, then suitably reduce the detection of preamble thresholding.
CNB2004100701652A 2004-08-04 2004-08-04 CDMA system random access threshold multi-path selection method Expired - Fee Related CN100393168C (en)

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WO2008122153A1 (en) * 2007-04-09 2008-10-16 Masshall Limited Dynamic multi-path detecting method and device in cdma communication system
CN101690374A (en) * 2006-10-30 2010-03-31 Lg电子株式会社 Method that is redirected that up link inserts and the method that control inserts at random in mobile communication system
CN101193435B (en) * 2006-11-29 2010-12-08 中兴通讯股份有限公司 Method for acquiring pilot detection threshold of random access channel at physical layer
WO2010148809A1 (en) * 2009-12-21 2010-12-29 中兴通讯股份有限公司 Mehod and system for recognizing random access burst signal
CN101137239B (en) * 2007-09-28 2012-01-11 中兴通讯股份有限公司 Random access parameter automatic optimization method
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US8428013B2 (en) 2006-10-30 2013-04-23 Lg Electronics Inc. Method of performing random access in a wireless communcation system
US8442017B2 (en) 2006-10-30 2013-05-14 Lg Electronics Inc. Method for transmitting random access channel message and response message, and mobile communication terminal
US8463300B2 (en) 2007-06-18 2013-06-11 Lg Electronics Inc. Paging information transmission method for effective call setup
US8493911B2 (en) 2007-09-20 2013-07-23 Lg Electronics Inc. Method of restricting scheduling request for effective data transmission
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US8798070B2 (en) 2007-05-02 2014-08-05 Lg Electronics Inc. Method of transmitting data in a wireless communication system
US8811336B2 (en) 2006-08-22 2014-08-19 Lg Electronics Inc. Method of performing handover and controlling thereof in a mobile communication system
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US8619685B2 (en) 2006-10-02 2013-12-31 Lg Electronics Inc. Method for transmitting and receiving paging message in wireless communication system
US9001766B2 (en) 2006-10-30 2015-04-07 Lg Electronics Inc. Method for re-direction of uplink access
CN101690374A (en) * 2006-10-30 2010-03-31 Lg电子株式会社 Method that is redirected that up link inserts and the method that control inserts at random in mobile communication system
CN101690374B (en) * 2006-10-30 2012-12-26 Lg电子株式会社 Method for re-direction of uplink access and method for controlling random access in mobile communication system
US8428013B2 (en) 2006-10-30 2013-04-23 Lg Electronics Inc. Method of performing random access in a wireless communcation system
US8442017B2 (en) 2006-10-30 2013-05-14 Lg Electronics Inc. Method for transmitting random access channel message and response message, and mobile communication terminal
US8520644B2 (en) 2006-10-30 2013-08-27 Lg Electronics Inc. Method for re-direction of uplink access
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WO2008122153A1 (en) * 2007-04-09 2008-10-16 Masshall Limited Dynamic multi-path detecting method and device in cdma communication system
USRE45347E1 (en) 2007-04-30 2015-01-20 Lg Electronics Inc. Methods of transmitting data blocks in wireless communication system
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US8493911B2 (en) 2007-09-20 2013-07-23 Lg Electronics Inc. Method of restricting scheduling request for effective data transmission
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