CN102904603B - search window processing method and device - Google Patents

Abstract

The present invention discloses a search window processing method and device. The method comprises the following steps: obtaining a serving cell where a mobile terminal whose motion speed exceeds a threshold is located; obtaining time delay information of an adjacent cell of the serving cell from pre-obtained data, and Determine the maximum time delay or the average time delay of the adjacent cell from the time delay information; determine the size of the search window corresponding to the maximum time delay or the average time delay of the adjacent cell. The invention can effectively reduce the search time of the pilot strength of the adjacent cell of the high-speed mobile network, and improve the handover success rate.

Description

Search window processing method and device

technical field

The present invention relates to the communication field, in particular, to a search window processing method and device.

Background technique

At present, whether public network coverage or private network coverage is used for high-speed railway coverage, there are inevitably high-speed mobile terminals and non-high-speed mobile terminals in the high-speed coverage network. For non-high-speed mobile terminals on the public network, due to the complexity of wireless propagation, there are many multipath delays, so it may be necessary to set the search window as large as possible. For high-speed mobile terminals covered by high-speed railways, for example, the running speed of high-speed trains can generally reach 200km/h to 350km/h, and the flight speed of aircraft is generally 800km/h to 1000km/h. There is a special requirement for the pilot search time, that is, the setting of the search window for the expected pilot is as small as possible, the time spent searching for a single pilot is as short as possible, and the search time for the entire adjacent cell pilot (for example, CDMA neighbors The number of regional pilots is 20) will also be shortened.

The existing search window optimization method is an optimization method of the search window based on round trip delay (Round Trip Delay, RTD for short). This method is to analyze and calculate the average value of RTD of the serving cell calculated by the operation and maintenance center (Operation Management Center, referred to as OMC) or the base station controller (BaseStation Controller, referred to as BSC) in the background, and then obtain the air interface delay of the network coverage radius, and then according to The air interface delay of the network coverage radius predicts the coverage of the terminal, so as to obtain a rough optimization value of the search window size.

However, the above search window optimization method based on RTD average adjustment has the following disadvantages: RTD reflects the average time delay of the serving cell signal, while the search window reflects the time delay of the signal of the adjacent cell relative to the signal of the serving cell Difference. Therefore, the RTD-based search window optimization method is only applicable when it is assumed that the average time delay RTD of the serving cell signal is approximately equal to the maximum time delay difference of the serving cell.

To sum up, it can be seen that the optimization method based on the RTD search window in the prior art cannot meet the requirements of the high-speed mobile environment for optimal setting of the search window.

Contents of the invention

The main purpose of the present invention is to provide a search window processing method and device to solve at least one of the above problems.

According to one aspect of the present invention, a search window processing method is provided, including the following steps: obtaining the serving cell where the mobile terminal whose motion speed exceeds a threshold is located; obtaining the time delay of the adjacent cell of the serving cell from the pre-obtained data information, and determine the maximum delay or average delay of the adjacent cell from the delay information; determine the size of the search window corresponding to the maximum delay or average delay of the adjacent cell.

Preferably, it is determined that the moving speed of the mobile terminal exceeds a threshold according to at least one of the following: determining that the service time of the mobile terminal in the current serving cell exceeds a preset threshold; determining the round trip of the reverse link of the mobile terminal The delay slope change value exceeds a preset slope threshold value; and it is determined that the moving speed of the mobile terminal acquired through the speed sensor of the mobile terminal exceeds a threshold value.

Preferably, obtaining the time delay information of the adjacent cells of the serving cell from the pre-obtained data includes: obtaining all handover request messages under the pseudo-random sequence PN of the serving cell from the pre-obtained data; The handover request message acquires the delay information of the adjacent cell of the serving cell.

Preferably, the handover request message includes: a pilot strength measurement report PSMM message.

Preferably, the pre-obtained data includes at least one of the following: drive test DT test data, operation and maintenance center OMC or BSC background data, call detailed tracking CDT data.

Preferably, the method further includes: setting the size of the search window based on the round-trip delay for the serving cell where the mobile terminal whose moving speed does not exceed the threshold is located.

According to another aspect of the present invention, there is also provided a search window processing device, including: an acquisition module, configured to acquire the serving cell where the mobile terminal whose motion speed exceeds a threshold is located; The time delay information of the adjacent cells of the serving cell; the first determination module is used to determine the maximum time delay or the average time delay of the adjacent cells from the time delay information; the second determination module is used to determine and The size of the search window corresponding to the maximum delay or the average delay of the adjacent cell.

Preferably, the obtaining module is configured to determine that the moving speed of the mobile terminal exceeds a threshold according to at least one of the following: determining that the service time of the mobile terminal in the current serving cell exceeds a preset threshold; determining the reverse direction of the mobile terminal The loop round-trip delay slope change value of the link exceeds a preset slope threshold value; and it is determined that the moving speed of the mobile terminal acquired through the speed sensor of the mobile terminal exceeds the threshold value.

Preferably, the obtaining module is further configured to obtain all handover request messages under the pseudo-random sequence PN of the serving cell from pre-obtained data, and obtain the corresponding handover request messages of the serving cell from the all handover request messages. Delay information of neighboring cells.

Preferably, the handover request message includes: a pilot strength measurement report PSMM message.

Through the present invention, the serving cell where the mobile terminal whose motion speed exceeds the threshold is obtained is obtained; the time delay information of the adjacent cell of the serving cell is obtained from the pre-obtained data, and the maximum time delay of the adjacent cell is determined from the time delay information; Determine the size of the search window corresponding to the maximum delay of the neighboring cell. It solves the problem that the optimization method based on the RTD search window in the prior art cannot meet the requirements for optimal setting of the search window in the high-speed mobile environment, can effectively reduce the search time of the pilot strength of the adjacent cell in the high-speed mobile network, and improve the handover success rate.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

1 is a flowchart of a search window processing method according to an embodiment of the present invention;

2 is a structural block diagram of a search window processing device according to an embodiment of the present invention;

Fig. 3 is a flowchart of a search window processing method according to a preferred embodiment of the present invention;

Fig. 4 is a structural block diagram of a device for optimizing a high-speed mobile network search window according to a preferred embodiment of the present invention;

Fig. 5 is a flowchart of a method for processing a search window in a high-speed mobile network according to a preferred embodiment of the present invention.

detailed description

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

For communication systems that need to search for pilots of neighboring cells (for example, systems that use handover techniques such as CDMA1x and EVDO), the search for pilots becomes more complicated when the mobile terminal is moving at high speed. In order to ensure that the terminal can search as many available pilots as possible in the high-speed mobile state, the search window can be set larger, but searching for more pilots is at the cost of sacrificing the search time. Neighboring pilots are very likely to cause the strength of the pilots to continuously increase and become interference, resulting in call drop.

In this embodiment, a method for processing a search window is provided, which can be applied to any high-speed mobile network. FIG. 1 is a flowchart of a method for processing a search window according to an embodiment of the present invention. As shown in FIG. 1 , the process Including the following steps:

Step S102, obtaining the serving cell where the mobile terminal whose moving speed exceeds a threshold (hereinafter referred to as high-speed moving or moving) is located.

Step S104, obtaining time delay information of neighboring cells of the serving cell from pre-obtained data, and determining the maximum time delay or average time delay of the neighboring cells from the time delay information.

Step S106, determining the size of the search window corresponding to the maximum time delay or the average time delay of the adjacent cell.

Through the above steps, considering that the network architecture of the high-speed network is relatively fixed, the data obtained in advance (for example, test data related to the high-speed network, drive test (DriveTest, referred to as DT) test data, operation and maintenance center (OperationManagementCenter , referred to as OMC) or BSC background data, call detail trace (CallDetailTrace, referred to as CDT)), and obtain delay information from it, and then determine the size of the search window according to the maximum delay of the adjacent cell, compared with the existing The technology only considers the average coverage distance of the serving cell and does not consider the relative delay of adjacent cells. Toggle the effect of the success rate.

If you use the average delay, you will get a more objective search window size that can adapt to a variety of situations. However, using the average delay will make the size of the search window slightly smaller, but the search time is relatively short: A relatively large search window can be obtained by using the maximum time delay, which can increase the probability of being searched, and these two methods can be selected according to actual needs.

The time delay information of adjacent cells can be obtained from many types of data obtained in advance, and a better way is provided in this embodiment, which can be obtained from the handover request message (for example, in In a CDMA network, the handover request message includes a pilot strength measurement message (PilotStrengthMeasuringMessage, PSMM for short)). In a preferred embodiment, step S104 may include the following steps:

Step S1042, obtaining all handover request messages of the serving cell from the pre-obtained data;

In step S1044, the time delay information of neighboring cells of the serving cell is obtained from all handover request messages. It should be noted that the delay information here refers to all neighboring cells adjacent to the serving cell.

Multiple ways can be used for judging whether the mobile terminal is in a high-speed motion state, and several better implementation modes are provided in this embodiment:

Method 1, determining that the service duration of the mobile terminal in the current serving cell exceeds a preset threshold;

Mode 2, determining that the slope change value of the loop round-trip delay of the reverse link of the mobile terminal exceeds a preset slope threshold value;

Manner 3: It is determined that the moving speed of the mobile terminal acquired by the speed sensor of the mobile terminal exceeds a threshold.

Compared with the first two methods, the third method requires a sensor on the mobile terminal, that is, needs hardware support of the terminal.

In another embodiment, at least two sets of parameters can be used for setting the search window. This method can be applied to any high-speed mobile network (for example, CDMA, GSM, UMTS, etc.), and can solve both high-speed mobile and non-high-speed mobile wireless networks. Different requirements for setting the size of the search window in different environments. For example, the size of the search window may be set based on, but not limited to, the round-trip delay for the serving cell where the mobile terminal whose moving speed does not exceed the threshold, or an empirical method may also be used to set the size of the search window.

Through this preferred embodiment, two sets of search window setting parameters are set (for example, the network covered by high-speed railway uses two sets of search window setting parameters), and it can be judged whether the mobile terminal is moving at a high speed. For non-high-speed mobile terminals, it is possible but not Limited to the search window parameters set by the optimization method based on the RTD search window; for high-speed mobile terminals, the search window parameters set by the high-speed mobile network search window optimization method based on the test data switching message can be used. According to the relative fixedness of the coverage lines such as aircraft flight paths, etc., the search window is optimized by using the time delay information reported by the test data switching message. In this way, the accuracy of optimal setting of network search windows covering high-speed railways and aircraft channels is improved, the search time of adjacent cell pilots is effectively reduced, the success rate of switching lines such as high-speed railways and aircraft channels is improved, and the occurrence of dropped calls is reduced. Network performance such as high-speed railways and airways.

In this embodiment, a search window processing device is also provided, which is used to realize the above-mentioned embodiment and its preferred implementation mode, which has already been explained and will not be described in detail. The module is described. As used below, the term "module" may be a combination of software and/or hardware that realizes a predetermined function. Although the systems and methods described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.

FIG. 2 is a structural block diagram of a search window processing device according to an embodiment of the present invention. As shown in FIG. 2 , the device includes an acquisition module 20 , an acquisition module 22 , a first determination module 24 and a second determination module 26 . Each module and its function are described below.

The acquisition module 20 is configured to acquire the serving cell where the mobile terminal whose motion speed exceeds a threshold is located. The acquiring module 20 can determine that the moving speed of the mobile terminal exceeds the threshold in many ways, for example, determining that the service time of the mobile terminal in the current serving cell exceeds a preset threshold, or determining the round-trip delay of the reverse link of the mobile terminal The slope change value exceeds the preset slope threshold value, or it is determined that the moving speed of the mobile terminal acquired through the speed sensor of the mobile terminal exceeds the threshold value. But not limited to this. The obtaining module 22 is connected to the obtaining module 20, which is used to obtain the delay information of the adjacent cells of the serving cell from the pre-obtained data, wherein the pre-obtained data includes but not limited to DT test data, OMC or BSC background data, CDT data. The first determining module 24 is connected to the obtaining module 22, and the module is used for determining the maximum delay or the average delay of the adjacent cells from the delay information. The second determination module 26 is connected to the second determination module 24, and the module is used for determining the size of the search window corresponding to the maximum time delay or the average time delay of adjacent cells.

Preferably, the obtaining module 22 is further configured to obtain all handover request messages of the serving cell from pre-obtained data, and obtain time delay information of adjacent cells of the serving cell from all handover request messages. For example, in a CDMA network, the handover request message may contain a PSMM message.

The following description will be made in conjunction with the preferred embodiment, which combines the above-mentioned embodiment and its preferred implementation mode. In this preferred embodiment, two sets of search window optimization parameters are set to solve the search window parameters of high-speed mobile and non-high-speed mobile base stations Optimization settings problem. In this preferred embodiment, it is first judged whether the terminal is moving at high speed. For high-speed mobile terminals, the high-speed mobile network search window optimization method based on test data switching messages is used. For non-high-speed mobile terminals, the RTD search window optimization method is used. .

Fig. 3 is the flow chart of the search window processing method according to the preferred embodiment of the present invention, and the method is based on the search window optimization of the high-speed mobile network of the test data handover message, as shown in Fig. 3, the process includes the following steps:

Step S302, judging whether the mobile terminal is in a high-speed moving state. The judging method can be but not limited to at least one of the following: when the service time of the mobile terminal in the current serving cell is greater than or equal to the preset duration threshold, the mobile state attribute of the mobile terminal is non-high-speed mobile, otherwise the mobile terminal’s mobile The status attribute is high-speed mobile; or, when the RTD slope change value of the mobile terminal reverse link is greater than or equal to the preset slope threshold value, the mobile status attribute of the mobile terminal is set to high-speed mobile; otherwise, the mobile terminal's mobile The state attribute is set to non-high-speed movement. If the judgment result of the mobile terminal is a non-high-speed moving state, then use the optimization method based on the RTD search window; if the judgment result of the mobile terminal is a high-speed moving state, go to step S304.

Step S304, collecting high-speed mobile test data of the high-speed mobile terminal. The high-speed mobile test data may include but not limited to at least one of the following test data: DT test data of the high-speed mobile network, or OMC or BSC background data, or other CDT tracking data. During implementation, the more detailed the high-speed mobile test data, the more it is good. For the DT test, a long call is used, and the test data includes all serving cells of the route of the high-speed mobile network (for example, covering all serving cells of the route of the high-speed railway line, the airway, etc.).

Step S306, extracting the PSMM message. Using a data analysis tool to extract the PSMM message in the test data, the data analysis tool used may be any data analysis tool that can extract the PSMM message, for example, a DT data analysis tool and the like.

Step S308, analyzing the pilot strength measurement data to generate maximum time delay information in neighboring cells of the serving cell. In step S308, in the process of generating the maximum time delay information in the adjacent cells of the serving cell, firstly, the test data is used to count all PSMM messages under the serving cell according to the serving cell. Secondly, according to the serving cell of the PSMM message as an object, the PSMM message is counted by a corresponding tool, and the time delay information of other cells (for example, all adjacent cells) is reported. Table 1 is the PSMM message delay statistics table, as shown in Table 1:

Table 1. Statistical Table of Pilot Strength Measurement Delay

Finally, the maximum time delay of the adjacent cells of the serving cell is counted respectively, and Table 2 is a statistical table of the maximum time delay of the adjacent cells of the serving cell, as shown in Table 2:

Table 2. Statistical Table of Maximum Delay of Neighboring Cells of Serving Cell

Step S310, optimize the search window of the high-speed mobile terminal. In step S310, firstly, the definition relation of the protocol about the search windows SRCH_WIN_A, SRCH_WIN_N, SRCH_WIN_R and the size of the search windows is introduced. In the protocol, the size of the search window is defined as 16 levels, namely 0-15, and each level corresponds to a different number of chips. Table 3 is the correspondence table between the search window and the size of the search window. It should be noted that different high-speed mobile networks correspond to different protocols, and the corresponding search window and the corresponding table of the search window size are also different, as shown in Table 3. Show:

Table 3. Correspondence between the search window and the size of the search window

Then, according to the maximum delay statistics table 2 of the neighboring cells of the serving cell, and according to the optimization judgment method of the search window optimization table, the actual setting of the search window size of the serving cell is determined. Table 4 is the search window optimization table, as shown in Table 4:

Table 4. Search window optimization table

Table 5 is the search window optimization result table, as shown in Table 5:

Table 5. Search window optimization result table

In step S312, the setting of the search window for non-high-speed mobile is to adopt an optimization method based on RTD average value adjustment. This method analyzes and calculates the average RTD value of the cell statistic by the OMC background, and then obtains the air interface delay, and finally predicts the delay based on the air interface. The location range of the terminal, so as to obtain a rough optimization value of the search window size.

Through this embodiment, the high-speed mobile network search window optimization method is adopted, that is, by setting two sets of search window optimization parameters for the high-speed mobile network and the non-high-speed mobile network, it can effectively solve the search window parameter setting requirements of high-speed mobile terminals and non-high-speed mobile terminals , can more accurately realize the setting and optimization of the high-speed mobile network search window, can effectively reduce the search time of the pilot strength of the adjacent cell of the high-speed mobile network, and improve the handover success rate of the high-speed mobile network.

In this preferred embodiment, a device for optimizing the search window of a high-speed mobile network is also provided. FIG. 4 is a structural block diagram of a device for optimizing a search window of a high-speed mobile network according to a preferred embodiment of the present invention. As shown in FIG. 4 , the The device includes a high-speed mobile decision module 40 , a test data collection and analysis module 42 , a serving cell analysis module 44 and a search window optimization module 46 . Each module of the device and its functions are described below.

High-speed mobile judgment module 40 (which realizes the same function as acquisition module 20), when the service time of the mobile terminal in the current serving cell is greater than or equal to the preset time length threshold, then the mobile state attribute of the mobile terminal is non-high-speed mobile, otherwise The mobility state attribute of the mobile terminal is high-speed movement. The test data collection and analysis module 42 (which realizes the similar function as the acquisition module 22) is connected to the high-speed mobile decision module 40 for collecting test data, and obtains PSMM messages by performing statistical analysis on the test data. The serving cell analysis module 44 (which realizes the function similar to the first determining module 24) is connected to the test data collection and analysis module 42, and is used to count the maximum time delay difference of adjacent cells corresponding to a single serving cell, and obtain the maximum time delay difference of the serving cell. delay. The search window optimization module 46 (which realizes the function similar to the second determination module 26) is connected to the serving cell analysis module 44, and is used to report the maximum time delay of the adjacent cell according to the statistical serving cell, according to the search window SRCH_WIN_A, SRCH_WIN_N, SRCH_WIN_R The definition relationship table between the size and the size of the search window determines the actual setting of the search window size of the serving cell.

The application of the above search window processing optimization processing method to a CDMA high-speed network is taken as an example to illustrate below. The following uses a CDMA network as an example for description.

Fig. 5 is the flowchart according to the high-speed mobile network CDMA search window processing method of preferred embodiment of the present invention, as shown in Fig. 5, this flow process comprises the steps:

Step S502, judging whether the mobile terminal is in a high-speed moving state. The judging method can be but not limited to at least one of the following: when the service time of the mobile terminal in the current serving cell is greater than or equal to the preset duration threshold, the mobile state attribute of the mobile terminal is non-high-speed mobile, otherwise the mobile terminal’s mobile The state attribute is high-speed movement; or, when the RTD slope change value of the reverse link of the mobile terminal is greater than or equal to the preset slope threshold value, the mobile state attribute of the mobile terminal is set to high-speed movement; obtained through the speed sensor of the mobile terminal If the movement speed of the received mobile terminal exceeds the threshold, set the mobile state attribute of the mobile terminal to high-speed movement; otherwise, set the mobile state attribute of the mobile terminal to non-high-speed movement. If the judgment result of the mobile terminal is a non-high-speed moving state, then use the optimization method based on the RTD search window; if the judgment result of the mobile terminal is a high-speed moving state, go to step S504.

Step S504, collecting high-speed mobile test data of the high-speed mobile terminal. The high-speed mobile test data may include but not limited to at least one of the following test data: DT test data of the high-speed mobile network, or OMC or BSC background data, or other CDT tracking data. During implementation, the more detailed the high-speed mobile test data, the more it is good. For the DT test, a long call is used, and the test data includes all serving cells of the route of the high-speed mobile network (for example, covering all serving cells of the route of the high-speed railway line, the airway, etc.).

Step S506, extract PSMM message. Use the data analysis tool to extract the PSMM message in the test data. It should be noted that the data analysis tool used can be any data analysis tool that can extract the PSMM message, for example, DT data analysis tool, etc.

Step S508, analyzing the pilot strength measurement data to generate maximum time delay information in neighboring cells of the serving cell.

In step S508, in the process of generating the maximum delay information in the neighboring cells of the serving cell, firstly, using the test data, all PSMM messages under the serving cell are counted according to the serving cell. Secondly, according to the serving cell of the PSMM message as an object, the PSMM message is counted by a corresponding tool, and the time delay information of other cells (for example, all adjacent cells) is reported. Table six is a PSMM message delay statistics table, in which table six shows the delay information of m adjacent cells corresponding to the same serving cell, as shown in table six:

Table 6. Statistical Table of Pilot Strength Measurement Delay

Finally, respectively count the maximum time delay of the adjacent cells of the serving cell. Table 7 is a statistical table of the maximum time delay of the adjacent cells of the serving cell. This table 7 shows that the time delay of all adjacent cells corresponding to the serving cell is the largest An adjacent cell of , as shown in Table 7:

Table 7. Statistical Table of Maximum Delay of Neighboring Cells of Serving Cell

Step S510, optimize the search window. Firstly, it introduces the definition relationship between the search windows SRCH_WIN_A, SRCH_WIN_N, SRCH_WIN_R and the size of the search window in the protocol. The protocol defines the size of the search window as 16 levels, namely 0-15, and each level corresponds to a different number of chips. Table 8 is a table corresponding to the size of the search window and the search window, as shown in Table 8:

Table 8. Correspondence between the search window and the size of the search window

Then, according to the maximum delay statistics table 7 of the adjacent cells of the serving cell, and according to the optimization judgment method of the search window optimization table, the actual setting of the search window size of the serving cell is determined. Table 9 is the search window optimization table, as shown in Table 9:

Table 9. Search window optimization table

Table 10 is the high-speed rail search window optimization result table, as shown in Table 10: For example, when the maximum delay is 18, compared with Table 9, it is located in the range of 20>=Delay>14, and the required search window size is 7 .

Table 10. Optimization results of the high-speed rail search window

In another embodiment, there is also provided a search window processing software, which is used to implement the technical solutions described in the above embodiments and preferred embodiments.

In another embodiment, a storage medium is also provided, in which the above-mentioned transmission delay control software is stored, and the storage medium includes but not limited to an optical disk, a floppy disk, a hard disk, a rewritable memory, and the like.

Through the above-mentioned embodiment and its preferred implementation mode, it is possible to reduce the fluctuation of the signal strength caused by the distance caused by the movement of the terminal during the search period, and to search for the strength of the corresponding pilot frequency as soon as possible, thereby reducing the handover time, improving the handover success rate, and avoiding the occurrence of dropped calls .

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Optionally, they can be implemented with program codes executable by computing devices, so that they can be stored in storage devices and executed by computing devices, or they can be made into individual integrated circuit modules, or their Multiple modules or steps are implemented as a single integrated circuit module. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a search window processing method, it is characterised in that comprise the steps:

Obtain the Serving cell that movement velocity exceedes the mobile terminal place of threshold value;

From the Delay of the neighbor cell being previously obtained data to obtain described Serving cell, and from described Delay, determine maximum delay or the average delay of described neighbor cell;

Determine the size of the search window corresponding with the maximum delay of described neighbor cell or average delay.

2. method according to claim 1, it is characterised in that determine that according at least one of the movement velocity of described mobile terminal exceedes threshold value:

Determine that the described mobile terminal service duration in current service cell exceedes pre-determined threshold;

Determine that the loop round-trip delay slope variation value of the reverse link of described mobile terminal exceedes default slope threshold value;

Determine that the movement velocity of the described mobile terminal got by the velocity sensor of described mobile terminal exceedes threshold value.

3. method according to claim 1, it is characterised in that include from the Delay of the neighbor cell being previously obtained data to obtain described Serving cell:

The whole handover request message under the pseudo-random sequence PN of described Serving cell are obtained from the data being previously obtained;

The Delay of the described neighbor cell of described Serving cell is obtained from described whole handover request message.

4. method according to claim 3, it is characterised in that described handoff request message is drawn together: pilot strength measurement report PSMM message.

5. method according to any one of claim 1 to 4, it is characterised in that be previously obtained data and include at least one of:

Drive test Drive Test data, operation maintenance center OMC or base station controller BSC back-end data, Call Detail Trace CDT data.

6. method according to any one of claim 1 to 4, it is characterized in that, the method for the size arranging search window not less than the Serving cell at the mobile terminal place of described threshold value for movement velocity at least includes: arrange the size of described search window based on loop round-trip delay.

7. a search window processes device, it is characterised in that including:

Acquisition module, for obtaining the Serving cell that movement velocity exceedes the mobile terminal place of threshold value;

Obtain module, for the Delay from the neighbor cell being previously obtained data to obtain described Serving cell;

First determines module, for determining maximum delay or the average delay of described neighbor cell from described Delay;

Second determines module, for determining the size of the search window corresponding with the maximum delay of described neighbor cell or average delay.

8. device according to claim 7, it is characterised in that according at least one of, described acquisition module is for determining that the movement velocity of described mobile terminal exceedes threshold value:

Determine that the described mobile terminal service duration in current service cell exceedes pre-determined threshold;

Determine that the loop round-trip delay slope variation value of the reverse link of described mobile terminal exceedes default slope threshold value;

Determine that the movement velocity of the described mobile terminal got by the velocity sensor of described mobile terminal exceedes threshold value.

9. device according to claim 7, it is characterized in that, described acquisition module is additionally operable to the whole handover request message obtaining under the pseudo-random sequence PN of described Serving cell from the data being previously obtained, and obtains the Delay of the described neighbor cell of described Serving cell from described whole handover request message.

10. device according to claim 9, it is characterised in that described handoff request message is drawn together: pilot strength measurement report PSMM message.