CN101359967B - High-speed fading detection method and apparatus applied in high-speed moving scene - Google Patents

High-speed fading detection method and apparatus applied in high-speed moving scene Download PDF

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Publication number
CN101359967B
CN101359967B CN2008101192200A CN200810119220A CN101359967B CN 101359967 B CN101359967 B CN 101359967B CN 2008101192200 A CN2008101192200 A CN 2008101192200A CN 200810119220 A CN200810119220 A CN 200810119220A CN 101359967 B CN101359967 B CN 101359967B
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resonance
interval
speed mobile
data
user terminal
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CN101359967A (en
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许百成
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Beijing T3G Technology Co Ltd
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Beijing T3G Technology Co Ltd
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Abstract

The invention provides a detecting method, a device and a communication method applied to flutter fading under the high-speed mobile scenes. The device comprises a data sectionalizer, a power calculator, a most value finder, a ratio calculator and a resonance judgment device, wherein, the data sectionalizer is used for dividing received data in a time slot into N sections to obtain N sections of data and the N is an integer greater than one; the power calculator is used for calculating average power of each section of the data in the N sections of the data to obtain N average powers; the most value finder is used for finding out the maximum value and the minimum value in the N average powers; the ratio calculator is used for calculating the ratio of the maximum value and the minimum value; and the resonance judgment device is used for judging whether the ratio is greater than the default value, and determines high-speed mobile of user terminal in a resonance interval with flutter fading when the ratio is greater than the default value. The user terminal can avoid frequent dropped calls during a high-speed mobile process according to the invention, and then user experience is improved.

Description

A kind of detection method and device of decreasing notably under the high-speed mobile scene of being applied to
Technical field
The invention belongs to wireless communication technology field, particularly a kind of detection method and device of decreasing notably under the high-speed mobile scene of being applied to.
Background technology
Usually, under the high-speed mobile scene, the subject matter that communication system faced has two: one is user terminal frequent problem of switching in high-speed mobile; Another is the Doppler frequency shift that causes owing to the user terminal high-speed mobile.In order to solve the frequent switching of user terminal, need to adopt bigger sub-district to cover.At present, the cloth net mode of BBU+RRU (BBU:Base Band Unit Base Band Unit, RRU:Remote Radio Unit far-end radio-cell) is to solve a kind of effective ways that Da Qu covers.Its principle as shown in Figure 1, be the signals of a plurality of RRU emissions from same BBU, that is to say that these a plurality of RRU belong to same logic district, its function is equivalent to many antennas of same base station, but each other can a good distance off, cover so on a large scale and just can realize.
If be but this scheme directly is applied in the problem that the expressway can exist along the line, when the user terminal of high-speed mobile in two RRU zone lines (hatched example areas among Fig. 1), signal from two RRU, watt level equates, but its Doppler frequency shift is just the opposite, at this moment received signal can produce rapid decline, and signal envelope is approximately a cosine function (with reference to Fig. 2).In this interval, user terminal is demodulate reception data substantially correctly, is easy to take place communication disruption.Like this, user terminal is the frequent call drop of meeting in the high-speed mobile process, thereby influences user experience.
Therefore, how to avoid user terminal frequent call drop in the process of high-speed mobile just to become the technical problem that needs to be resolved hurrily.
Summary of the invention
Technical problem to be solved by this invention provides a kind of detection method, device and communication means of decreasing notably under the high-speed mobile scene of being used for, to avoid the frequent call drop of user terminal in the high-speed mobile process.
For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:
A kind of checkout gear of decreasing notably under the high-speed mobile scene of being applied to comprises:
The data sementation device, the data that are used for receiving in the time slot are divided into the N section, obtain the N segment data, and N is the integer greater than 1;
Power calculator is used for calculating the average power of the every segment data of described N segment data, obtains N average power;
Be worth most finger, be used for finding out the maximum and the minimum value of a described N average power;
The ratio calculation device is used to calculate the ratio of described maximum and minimum value;
Whether the resonance determining device is used to judge described ratio greater than preset value, if then determine user terminal high-speed mobile in the interval of resonance that decreases notably.
Above-mentioned device, wherein, described N is 6, described preset value is 6.
A kind of detection method of decreasing notably under the high-speed mobile scene of being applied to comprises the steps:
The data that receive in the time slot are divided into the N section, obtain the N segment data, N is the integer greater than 1;
Calculate the average power of every segment data in the described N segment data, obtain N average power;
Find out maximum and minimum value in the described N average power;
Calculate the ratio of described maximum and minimum value;
Whether judge described ratio greater than preset value, if then determine user terminal high-speed mobile in the interval of resonance that decreases notably.
A kind of communication means that is applied under the high-speed mobile scene comprises:
The severe degree that user terminal changes according to received signal power in the time slot is judged whether high-speed mobile in the interval of resonance that decreases notably of this user terminal, if then force communication to keep in this interval of resonance.
Above-mentioned method wherein, when determining in the interval of resonance that this user terminal is decreasing notably high-speed mobile, also stops automatic frequency control, automatic gain control and follows the tracks of synchronously.
By technical scheme of the present invention, can judge whether high-speed mobile in the interval of resonance that decreases notably of user terminal, so, when being, just can adopting the pressure method such as maintenance of communicating by letter to avoid conversation loss, thereby improve user experience in judged result.
Description of drawings
Fig. 1 is that the Da Qu of BBU+RRU covers principle schematic;
Fig. 2 is the envelope schematic diagram of user terminal received signal during high-speed mobile in interval of resonance;
Fig. 3 is the structural representation of the flutter fading checkout gear of the embodiment of the invention;
Fig. 4 is the data structure schematic diagram in time slot of TD-SCDMA system;
Fig. 5 is the flow chart of the flutter fading detection method of the embodiment of the invention.
Embodiment
For convenience of description, this paper is called interval of resonance with the hatched example areas among Fig. 1.Simultaneously, among the present invention so-called " at a high speed ", the translational speed that is meant user terminal is greater than 150km/h.In TD SDMA (TD-SCDMA) system, the length of interval of resonance is 234m.When user terminal passed interval of resonance with the speed of 300～400km/h, required time probably was 2～3 seconds.If user terminal can detect interval of resonance, just can in this interval, force communication to keep, communication can recover normal reception after 2～3 seconds.Like this, just avoided the problem of communication terminal frequent call drop in the high-speed mobile process.Because it is very short that the terminal of high-speed mobile is passed through this interval time, therefore can not influence user experience significantly.
The method that the embodiment of the invention is taked is: judge according to the severe degree that received signal power in the time slot changes whether the user is in interval of resonance.
In order to describe this algorithm better, will be defined as follows in the variables set of using in the literary composition here:
The TD-SCDMA signal of the time slot that the RS user terminal receives
D 0～D N-1Take from the N segment data of RS
p 0～p N-1Corresponding to D 0～D N-1The performance number of N segment data
p Maxp 0～p N-1In maximum
p Minp 0～p N-1In minimum value
R p MaxAnd p MinRatio
T is used for judging the threshold value of interval of resonance
With reference to Fig. 3, the checkout gear of the flutter fading of the embodiment of the invention mainly comprises: data sementation device 10, power calculator 20, be worth finger 30, ratio calculation device 40 and resonance determining device 50 most.
Data sementation device 10 is divided into the N section with the data that receive in the time slot, is respectively D 0～D N-1This N segment data does not overlap each other, and each segment data all is continuous.
With reference to Fig. 4, the interior data of time slot comprise in the TD-SCDMA system: two length are respectively the data block of 352 chips (chip), training sequence (Midamble) data of 144 chips, the protection interval (GP) of 16 chips.Preferably, get N=6, the data that are about in the time slot are divided into 6 sections.
Power calculator 20 calculates D 0～D N-1The average power p of every segment data in this N segment data 0～p N-1, computing formula is:
p i = 1 K i Σ k = 0 k = K i - 1 | D i , k | 2 , i＝0，1...N-1
In the formula, K iThe data length of representing each data segment, D I, kExpression D iThe k chip.
Be worth most finger 30, find out p 0～p N-1Maximum p in this N average power MaxWith minimum value p Min, as follows:
p max＝max{p 0，p 1，…p N-1}
p min＝min{p 0，p 1，…p N-1}
Ratio calculation device 40 calculates maximum p MaxWith minimum value p MinBetween ratio r, as follows:
r = p max p min
Resonance determining device 50 is judged whether high-speed mobile in the interval of resonance of flutter fading of user terminal according to the size of r value.The r value is big more to show that the variable power of signal is fast more, and it is serious more to decline.Therefore, preestablish a threshold T, the r value is then determined user terminal high-speed mobile in the interval of resonance that decreases notably during greater than threshold T; Otherwise, determine the current not high-speed cruising in interval of resonance of user terminal.Preferably, default T=6.
With reference to Fig. 5, the embodiment of the invention also provides a kind of detection method of decreasing notably under the high-speed mobile scene of being applied to, and described method mainly comprises the steps:
Step 501: the data that receive in the time slot are divided into the N section, obtain the N segment data, N is the integer greater than 1;
Step 502: calculate the average power of every segment data in the described N segment data, obtain N average power;
Step 503: find out maximum and minimum value in the described N average power;
Step 504: the ratio that calculates described maximum and minimum value
Step 505: whether judge described ratio greater than preset value, if then determine user terminal high-speed mobile in the interval of resonance that decreases notably.
Accordingly, the embodiment of the invention also provides a kind of communication means that is applied under the high-speed mobile scene, described method is: the severe degree that user terminal changes according to received signal power in the time slot is judged whether high-speed mobile in the interval of resonance that decreases notably of this user terminal, if then in this interval of resonance, force communication to keep.Meanwhile, controlling units such as the automatic frequency control (AFC) of user terminal, automatic gain control (AGC) and tracking synchronously should quit work, because signal fadeout this moment is very serious, the input meeting that the every index that goes out with at this moment calculated signals is used as every controlling unit brings great risk to system.
Wherein, the detailed process of high-speed mobile can be referring to the step 501 of step～step 505 above in the interval of resonance that decreases notably to judge user terminal.
In sum, by the technical scheme of the embodiment of the invention, can judge whether high-speed mobile in the interval of resonance that decreases notably of user terminal, so,, just can adopt methods such as forcing the communication maintenance to avoid conversation loss, thereby improve user experience when being in judged result.
Should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (8)

1. one kind is applied to the checkout gear that decreases notably under the high-speed mobile scene, it is characterized in that, comprising:
The data sementation device, the data that are used for receiving in the time slot are divided into the N section, obtain the N segment data, and N is the integer greater than 1;
Power calculator is used for calculating the average power of the every segment data of described N segment data, obtains N average power;
Be worth most finger, be used for finding out the maximum and the minimum value of a described N average power;
The ratio calculation device is used to calculate the ratio of described maximum and minimum value;
The resonance determining device, be used to judge that whether described ratio is greater than preset value, if, then determine user terminal high-speed mobile in the interval of resonance that decreases notably, wherein, the interval of resonance of described flutter fading is the zone line of two far-end radio-cell RRU, in this zone line, from the watt level of the signal of two RRU equate, Doppler frequency shift is opposite.
2. device as claimed in claim 1 is characterized in that:
Described N is 6.
3. device as claimed in claim 1 is characterized in that:
Described preset value is 6.
4. one kind is applied to the detection method that decreases notably under the high-speed mobile scene, it is characterized in that, comprises the steps:
The data that receive in the time slot are divided into the N section, obtain the N segment data, N is the integer greater than 1;
Calculate the average power of every segment data in the described N segment data, obtain N average power;
Find out maximum and minimum value in the described N average power;
Calculate the ratio of described maximum and minimum value;
Judge that whether described ratio is greater than preset value, if, then determine user terminal high-speed mobile in the interval of resonance that decreases notably, wherein, the interval of resonance of described flutter fading is the zone line of two far-end radio-cell RRU, in this zone line, from the watt level of the signal of two RRU equate, Doppler frequency shift is opposite.
5. method as claimed in claim 4 is characterized in that:
Described N is 6.
6. method as claimed in claim 4 is characterized in that:
Described preset value is 6.
7. a communication means that is applied under the high-speed mobile scene is characterized in that, comprising:
The severe degree that user terminal changes according to received signal power in the time slot is judged whether high-speed mobile in the interval of resonance that decreases notably of this user terminal, if, then in this interval of resonance, force communication to keep, wherein, the interval of resonance of described flutter fading is the zone line of two far-end radio-cell RRU, in this zone line, from the watt level of the signal of two RRU equate, Doppler frequency shift is opposite;
Described judge this user terminal whether in the interval of resonance that decreases notably high-speed mobile specifically comprise:
The data that receive in the time slot are divided into the N section, obtain the N segment data, N is the integer greater than 1;
Calculate the average power of every segment data in the described N segment data, obtain N average power;
Find out maximum and minimum value in the described N average power;
Calculate the ratio of described maximum and minimum value;
Whether judge described ratio greater than preset value, if then determine this user terminal high-speed mobile in the interval of resonance that decreases notably.
8. method as claimed in claim 7 is characterized in that:
When determining in the interval of resonance that this user terminal is decreasing notably high-speed mobile, also stop automatic frequency control, automatic gain control and follow the tracks of synchronously.
CN2008101192200A 2008-08-29 2008-08-29 High-speed fading detection method and apparatus applied in high-speed moving scene Expired - Fee Related CN101359967B (en)

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US8923880B2 (en) * 2012-09-28 2014-12-30 Intel Corporation Selective joinder of user equipment with wireless cell

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5634206A (en) * 1995-05-25 1997-05-27 Motorola, Inc. Method and apparatus for estimating a signal fading characteristic
CN1976255A (en) * 2005-11-28 2007-06-06 上海原动力通信科技有限公司 Method for realizing user normal communication under high-speed moving
CN101204027A (en) * 2005-06-29 2008-06-18 京瓷株式会社 Radio communication device, radio communication method, and radio communication program

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5634206A (en) * 1995-05-25 1997-05-27 Motorola, Inc. Method and apparatus for estimating a signal fading characteristic
CN101204027A (en) * 2005-06-29 2008-06-18 京瓷株式会社 Radio communication device, radio communication method, and radio communication program
CN1976255A (en) * 2005-11-28 2007-06-06 上海原动力通信科技有限公司 Method for realizing user normal communication under high-speed moving

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