WO2012072040A1 - Method for selecting frequency point, hnb and device - Google Patents

Abstract

Disclosed are a method for selecting a frequency point, an HNB and a device. The method includes: determining the signal interference strength of a target base station at each frequency point and the service loads of the other base stations apart from the target base station at each frequency point; and determining the working frequency point of the target base station according to the signal interference strength of the target base station at each frequency point and the service loads of the other base stations apart from the target base station at each frequency point. The present invention can optimize the frequency selection strategy of the HNB cell and therefore decrease co-channel interference among HNB cells.

Description

 A frequency point selection method and a home base station and device are required to be submitted to the Chinese Patent Office on December 2, 2010, the application number is 201010570452.5, and the invention name is "a frequency point selection method and a home base station, a device" Priority of Chinese Patent Application, the entire contents of which is incorporated herein by reference. Technical field

 The present invention relates to wireless communication technologies, and in particular, to a frequency point selection method and a home base station and device. Background technique

 In the existing scheme, a home base station (HNB) cell, which is a femto cell base station (Femto), measures the basic common control physical channel (Primary) for each selectable frequency point during initial cell establishment. Common Control Physical Channel (P-CCPCH) receives power, and considers that the frequency of the received signal with low received power is low, so the frequency with the lowest signal interference strength is selected as the initial frequency of the Femto cell. .

 The shortcomings of the prior art are:

 The judgment of the interference condition of different frequency points only considers the strength of the interference power, and does not consider the influence of other factors. Therefore, this also causes the existing frequency point configuration not to make the cell in the state with the lowest traffic channel interference.

Summary of the invention

 The technical problem to be solved by the present invention is to provide a frequency point selection method and a home base station and a device for selecting a working frequency point for a target base station to enable a target base station cell to be in a state with the lowest traffic channel interference.

 In the embodiment of the present invention, a frequency point selection method is provided, which includes the following steps:

 Determining the signal interference strength of the target base station at each frequency point, and the traffic load of each base station other than the target base station at each frequency point;

 The working frequency of the target base station is determined according to the signal interference strength received by the target base station at each frequency point and the traffic load of each base station other than the target base station at each frequency point.

 In the embodiment of the present invention, a home base station is provided, including:

 An intensity determining module, configured to determine a signal interference strength received by the base station at each frequency point;

 a load determining module, configured to determine a service load of other base stations at each frequency point;

The frequency point determining module is configured to determine the working frequency of the base station according to the signal interference strength received by the base station at each frequency point and the service load of other base stations at each frequency point. A frequency point selection device is provided in the embodiment of the present invention, including:

 An intensity determining module, configured to determine a signal interference strength received by the target base station at each frequency point;

 a load determining module, configured to determine a traffic load of each base station other than the target base station at each frequency point; a frequency point determining module, configured to: according to a signal interference strength received by the target base station at each frequency point, and other than the target base station The traffic load of the base station at each frequency point determines the working frequency of the target base station.

 The beneficial effects of the present invention are as follows:

 In the technical solution provided by the embodiment of the present invention, the working frequency of the target base station is determined according to the signal interference strength received by the target base station at each frequency point and the traffic load of each base station other than the target base station at each frequency point. The interference of the service time slot is statistically calculated for a certain period of time, and the probability of the signal transmission of different frequency points is also taken as a factor for selecting the frequency point. The target cell frequency selection strategy is optimized, thereby reducing the co-channel interference between the target base station cells. .

DRAWINGS

 1 is a schematic diagram of a frequency selection environment of a Femto cell according to an embodiment of the present invention;

 2 is a schematic flowchart of an implementation process of an intermediate frequency point selection method according to an embodiment of the present invention;

 3 is a schematic flowchart of an implementation process of a frequency point selection method in an initial synchronization process according to an embodiment of the present invention;

 4 is a schematic flowchart of a method for implementing a frequency point selection method after an initial configuration process in an embodiment of the present invention; FIG. 5 is a schematic structural diagram of a home base station according to an embodiment of the present invention;

 FIG. 6 is a schematic structural diagram of an intermediate frequency point selection apparatus according to an embodiment of the present invention. detailed description

 The inventor noticed during the invention:

 Taking the Femto base station in the home base station as an example, on the one hand, the existing scheme determines the interference of different frequency points only considering the strength of the interference power, and does not consider the load situation of different frequency points, that is, there are thousands of different frequency points. The probability of the disturbance.

 Figure 1 is a schematic diagram of the frequency selection environment of the Femto cell. In the scenario shown in Figure 1, in the same floor, Celll~Cell3 select frequency points 1~3 as the working frequency points.

 According to the existing method, when the cell 4 is turned on and the initial configuration is performed, the interference value of the different frequency points in the CelW is determined according to the reference signals of the frequency points 1~3. Because it is far away from Celll, according to the judgment of the absolute power of the interference signal, F1 is usually selected as the cell establishment frequency.

 However, if Celll uses a higher utilization of business resources. Cell2 Cell3 uses services such as web browsing that have low resource utilization. In fact, the load on the frequency points F1~F3 is different.

That is, in the technical solution provided by the prior art, the judgment of the interference condition of different frequency points only considers the interference power. The strength, but does not consider the traffic load situation of different frequency points, that is, does not consider the influence of the probability of interference at different frequency points, only judges the interference strength from the received power, and this leads to the failure to configure the frequency point to the service. The state with the lowest channel interference.

 On the other hand, due to the characteristics of the Femto base station for expanding the capacity of indoor users, the coverage area is usually in the coverage area of the macro cell. At the same time, due to the characteristics of the distribution of users in the residential area, the distance between multiple Femto base stations is relatively close, so the macro cell and The problem of co-channel interference between Femto cells and between different Femto cells is particularly serious.

 In view of this, the technical solution provided by the embodiment of the present invention selects a frequency in the initial establishment process or the periodic frequency self-optimization process of the Femto cell to achieve the purpose of avoiding or reducing co-channel interference, thereby reducing the Femto interval. Co-channel interference. Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

 2 is a schematic flowchart of a frequency point selection method. As shown in the figure, the frequency point selection may include the following steps: Step 201: Determine a signal interference strength of a target base station at each frequency point, and other base stations other than the target base station. The traffic load at each frequency point;

 Step 202: Determine a working frequency point of the target base station according to a signal interference strength received by the target base station at each frequency point, and a service load of each base station other than the target base station at each frequency point.

 In implementation, the probability of interference is: The number of subframes in which the frequency is disturbed by a certain statistical duration is divided by the statistical duration. Then, for the target base station, the larger the traffic load of the other base station at the frequency point, the more the number of subframes of the interference existing at the frequency point must be, and therefore, the traffic load condition of each base station at each frequency point is The probability of interference to the target base station at the frequency point can be obtained; that is, the interference probability of the other base stations to the target base station at each frequency point is highly correlated with the traffic load of other base stations at the frequency point.

 Taking the target base station as a home base station as an example, the steps 201 and 202 can be implemented by the home base station, that is, the home base station determines the interference strength received by the base station at each frequency point, and the other base stations at each frequency point. Service load; The home base station determines the working frequency of the base station according to the interference strength received by the base station at each frequency point and the traffic load of other base stations at each frequency point.

 In the following implementations, the implementation of the home base station will be mainly described as an example. In the implementation, the home base station is taken as an example because it is relatively easy to implement the scheme by the home base station; however, in theory, as long as it is The device can determine the interference strength of the target base station at each frequency point, and the traffic load of each base station other than the target base station at each frequency point, and notify the device of the target base station of the determined working frequency point to implement the solution, for example, Obtaining the traffic load of each base station other than the target base station at each frequency point from the network resource management device, the interference strength of the target base station at each frequency point can be known by a special device, and then the working frequency determined by the target base station is notified by the upper layer. Therefore, the home base station is used as an example only to teach those skilled in the art how to implement the present invention, but it does not mean that it can be implemented only by using a home base station. In the implementation process, the corresponding implementation equipment can be determined in combination with practical needs.

In a specific implementation, when determining the signal interference strength received by the target base station at each frequency point, the received power of each frequency point on the P-CCPCH of the target base station may be determined. That is, according to each frequency point on the P-CCPCH of the target base station The received power determines the signal interference strength of the target base station at the corresponding frequency point. Specifically, the received total bandwidth (TWP) of each frequency point on the P-CCPCH of the target base station may be measured, and the measured RTWP is used as the signal interference strength of the target base station at the corresponding frequency point.

 Specifically, the distance between the intra-frequency cell and the cell (ie, the cell of the target base station) at different frequency points can be obtained by using the received power of each frequency point on the P-CCPCH of the target base station.

 In an implementation, determining a service load of each base station other than the target base station at each frequency point may include: measuring, in a set time, a signal interference strength of each frequency point to the target base station in the service time slot; The measured signal interference intensity of each frequency point on the service time slot to the target base station is determined, and the average signal interference intensity of each frequency point to the target base station in the service time slot is determined;

 The average signal interference strength of each frequency point to the target base station on the service time slot is used as the traffic load at each frequency point of the base station other than the target base station.

 In the following, the implementation of the home base station will be described as an example of the initial frequency selection process and the implementation of the frequency self-optimization process.

 First, the implementation in the initial frequency selection process.

 1. Determine the business load.

 In this phase, during the initial synchronization of the HNB, the HNB can complete its own synchronization according to the air interface signal of the macro cell or other methods, and obtain the uplink and downlink time slot positions.

 In this way, during the initial configuration process of the cell, the process of measuring the signal interference strength of the HNB on the uplink and downlink service time slots of each frequency point is measured, and the statistics are continuously counted in a certain time period, thereby obtaining the frequency of each frequency point in the uplink and downlink service. The average signal interference intensity and the probability of occurrence of interference on the HNB.

 2. Determine the signal interference strength.

 Specifically, the received power of each frequency point on the P-CCPCH of the HNB can be measured, thereby determining the signal interference strength of the HNB at the corresponding frequency. The measured power of the P-CCPCH can be obtained to obtain the distance of the same-frequency cell from the local cell at different frequency points. Specifically, the RTWP of each frequency point on the P-CCPCH of the HNB can be measured, and the measured RTWP is used as the signal interference strength of the HNB at the corresponding frequency point.

 In a specific implementation, before determining the traffic load of the other base stations at each frequency point, the method further includes: determining, according to the interference power of the frequency point with the smallest interference strength of the target base station, the frequency of the interference power of the target base station within a threshold range That is, the frequency point at which the signal interference intensity of the HNB is minimized is taken as the optimal frequency point, and the difference between the signal interference intensity of the HNB and the signal interference intensity of the optimal frequency point to the HNB is determined to be smaller than the set threshold. Frequency point; a frequency point smaller than the set threshold value is used as the working frequency point to be selected;

 Then, when determining the traffic load of other base stations at each frequency point, the service load of the other base stations at each of the selected working frequency points can be determined.

In a specific implementation, in the initial frequency selection process, according to the signal interference intensity received by the HNB at each frequency point, The service load of the base station at other frequency points other than the JiBNB determines the working frequency of the HNB, and may include: determining the frequency point of the lowest traffic load in the uplink service time slot in each frequency point, and the downlink service in each frequency point The frequency at which the traffic load on the gap is the lowest;

 The frequency of the lowest service load of the uplink service time slot is the same as the frequency of the lowest traffic load of the downlink service time slot, and the frequency point is determined to be the working frequency point of the target base station;

 When the frequency of the lowest traffic load of the uplink service time slot is different from the frequency of the lowest traffic load of the downlink service time slot, it is determined that the frequency of the signal interference strength of the target base station is the smallest, and the frequency of the target base station is the working frequency of the target base station. point.

 The following is an example. If there are n frequency points on the P-CCPCH of the HNB and the RTWP of the optimal frequency point on the P-CCPCH of the HNB is close (the difference between the two is less than a certain threshold), then from this n Among the +1 frequency points, the frequency point with the lower rate of the service time slot is selected as the working frequency point. specific:

_L IF. RTWP _{TSC) Ρί} - RTW ^ _F1 < Thl] Select the frequency set ¹ ' ^TSQ ' ^{Fl TS0} ' ^{Fl J} with weak P-CCPCH interference. Based on the synchronization timing of the cell, the signal interference intensity of the HNB on the uplink and downlink time slots is measured and continuously measured within a certain timing. Let the measurement result be:

RTWP, RTWP^ RTWP^ _{2 UL} RTWP^ _DL .. . RTWP , _UL , Li L

Wherein, F1 corresponds to an optimal frequency point, F2~Fn corresponds to other interference weak frequency points (sorted according to P-CCPCH received power), UL is an uplink time slot, and DL is a downlink time slot. ^ε [0, Γ], τ is the measurement duration.

 Average the measurement results:

 t= T

 Ϋ R Ώ TΤ ΤWλ PΙ

 Fi 'UL

ISCP _{Fi UL} -

 τ

 t=T

 RTWPl, t

 Fi'DL

 ISCP F, t=0

 i, DL-T respectively obtain the frequency of the lowest traffic load on the uplink and downlink service time slots:

当

min作为工作频点。 当 F m^Um^L≠ F m^Dm^L， 选择 F m^Um^L、 F m^Dm^L中对 的信号干扰强度最小的频点作为工 作频点。 图 3为在初始同步过程中频点选择方法实施流程示意图， 如图所示， 在初始同步过程 中在频点选择时可以包括如下步骤：

when

Min as the working frequency. When F m ^U m ^L ≠ F m ^D m ^L , the frequency at which the signal interference intensity of the pair in F m ^U m ^L and F m ^D m ^L is the smallest is selected as the operating frequency point. FIG. 3 is a schematic diagram of an implementation process of a frequency point selection method in an initial synchronization process. As shown in the figure, in the initial synchronization process, the frequency point selection may include the following steps:

 Step 301: The HNB completes the initial synchronization.

 In this step, during the initial synchronization process, the HNB can complete its own synchronization according to the air interface signal of the macro cell or other manners to obtain the uplink and downlink time slot positions.

 Step 302: Measure the received power of each frequency point on the P-CCPCH of the HNB, and select an optimal frequency point according to the measurement result. Specifically, select a frequency point with a minimum received power on the P-CCPCH, that is, a signal interference strength to the HNB. The smallest frequency point is used as the optimal frequency point.

 In this step, the optimum frequency point is set to F1 described above.

 Step 303: Determine whether there are other frequency points that satisfy the following conditions: a difference between the received power on the P-CCPCH and the received power of the optimal frequency point on the P-CCPCH <thl, and if yes, other frequencies that satisfy the condition After the point is used as the sub-optimal frequency point, the process proceeds to step 305, otherwise, the process proceeds to step 304.

 Step 304: Select F1 as the initial establishment frequency point, and the process ends.

 Step 305: Measure the signal interference strength of the optimal frequency point and the sub-optimal frequency point to the HNB in the service time slot, and count the signal interference intensity of the HNB in the service time slot of the optimal frequency point and the sub-optimal frequency point in a certain time period. The average signal interference strength.

 Step 306: Select a frequency point with the lowest average signal interference strength of the uplink and downlink service time slots respectively.

 Step 307: Determine whether the frequency of the lowest signal interference strength of the uplink and downlink service time slots is the same. If yes, go to step 308. Otherwise, go to step 309.

 Step 308: Select the frequency point as the initial setup frequency point.

 Step 309: In the frequency point where the average signal interference strength of the uplink service time slot is the lowest and the average signal interference strength of the downlink service time slot is the lowest, the frequency point with the smallest signal interference intensity of the HNB is used as the initial establishment frequency point.

 In addition, in the following frequency self-optimization process, a similar manner may be adopted to measure and average the traffic time slot interference strength of different frequency points for a certain period of time, thereby selecting a frequency of signal interference strength or a lower traffic load. The point is the target frequency of self-optimization.

 Second, the implementation of the self-optimization process at the frequency point.

In this stage, it can be implemented periodically as follows, but it can of course be implemented as needed. In order to facilitate the understanding of the specific implementation of the present mode, a periodic implementation is taken as an example, that is, periodic measurement is performed to determine the signal interference strength of each frequency point to the target base station, and the traffic load of the target base station at each frequency point. And determine the work of the target base station Do the frequency. The Femto base station is taken as an example for description.

 In a specific implementation, in the frequency point self-optimization process, the working frequency of the target base station is determined according to the signal interference strength received by the target base station at each frequency point, and the service load of each base station other than the target base station at each frequency point, Includes:

 A. The frequency point currently used by the target base station is used as the current candidate frequency point;

 B. For an available frequency point, determine whether the following condition 1 or condition 2 is satisfied, if yes, the current available frequency point is taken as the current candidate frequency point, and proceeds to step C; otherwise, directly to step C;

 Condition 1: The signal interference strength of the current available frequency point to the target base station is smaller than the signal interference strength of the current candidate frequency point to the target base station, and the difference between the two is greater than the first threshold;

 Condition 2: The uplink traffic load on the current available frequency point is smaller than the uplink traffic load on the current candidate frequency point, and the difference between the two is greater than the second threshold; the downlink traffic load on the current available frequency point is smaller than the current candidate frequency point. The downlink traffic load, and the difference between the two is greater than the second threshold; and the signal interference strength of the current available frequency point to the target base station is smaller than the signal interference strength of the current candidate frequency point to the target base station, and the difference between the two is greater than the third a threshold; wherein, the first threshold is greater than a third threshold;

 C. Determine whether all available frequency points are traversed. If yes, use the current candidate frequency point as the optimal frequency point, that is, the working frequency point of the target base station. Otherwise, select the next available frequency point and go to step B.

 In the implementation, the measurement is performed when the home base station does not have a user in a Radio Resource Control (RRC) connection state.

 The following is an example of the implementation of a home base station:

 Periodically measuring the received power of the available frequency point on the P-CCPCH of the HNB, and the available frequency point is on the uplink and downlink.

 RTWP' RTWP*

Signal interference strength of HNB on the gap

 The average signal interference strength of the uplink and downlink time slots in the most recent T time is counted:

 =τ

 Σ 7?TWi

 FiJJL

 ISCP - FT7iJ TJTLT―

 τ

 t=T

 RTWP, Fi'DL

 i=0

ISCP _{FI DL}

 T

 If the available frequency point satisfies one of the following conditions, the available frequency point is selected as the current candidate frequency point.

1. The received power of the available frequency point on the P-CCPCH of the HNB is less than the received power of the current candidate frequency point of the HNB on the P-CCPCH of the HNB, and the difference between the two is greater than a certain threshold thl: RTWP Ts0 _F - RTW > thl ·

 2. The average signal interference strength of the available frequency point in the uplink time slot to the HNB is smaller than the average signal interference intensity of the current candidate frequency point in the uplink time slot to the HNB, and the difference between the two is greater than a certain threshold th2; the available frequency point is The average signal interference strength of the downlink time slot to the HNB is smaller than the average signal interference strength of the current candidate frequency point in the downlink time slot to the HNB, and the difference between the two is greater than a certain threshold th2; the available frequency point is in the P-CCPCH of the HNB The received power is smaller than the received power of the current candidate frequency point on the P-CCPCH of the HNB, and the difference between the two is greater than a certain threshold th3, that is:

ISCP _{F m} ^L - ISCP _F ^l .^ _m ^L > thl , and ISCP _{F DJ} - ISCP _{Fi DJ} > thl liter and RTWP _T T _SS0 Q, _F F _Currmt - RTWP _{Ts0 F} > _t ,

 (th3<thl).

 In a specific implementation, the number of samples of the Interfere Signal Code Power (ISCP) measurement result may be greater than a certain amount.

 In the specific implementation, since the periodic frequency self-optimization needs to measure other frequency points during the normal working process of the Femto base station, the Femto base station can perform periodic self-optimized measurement when there is no user in the RRC connected state. Figure 4 is a schematic diagram of the implementation process of the frequency point selection method after the initial configuration process ends. As shown in the figure, after the initial configuration process ends, the frequency point selection may include the following steps:

 Step 401: The frequency point currently used by the target base station is used as the current candidate frequency point; periodically, the received power of the available frequency point on the P-CCPCH of the HNB, and the signal of the available frequency point to the HNB on the uplink and downlink time slots. Interference intensity.

 Step 402: Determine whether the received power of the available frequency point on the P-CCPCH of the HNB is smaller than the received power of the current candidate frequency point on the P-CCPCH of the HNB, and the difference between the two is greater than a certain threshold. If yes, go to step 405. Otherwise, go to step 403.

 Step 403: Determine whether the average signal interference strength of the available frequency point to the HNB in the service time slot is smaller than the average signal interference strength of the current candidate frequency point in the service time slot to the HNB, and the difference between the two is greater than a certain threshold; and the available frequency point The signal interference strength to the HNB is less than the signal interference strength of the current candidate frequency point to the HNB, and the difference between the two is greater than a certain threshold. If yes, the process proceeds to step 405, otherwise, the process proceeds to step 404.

 Step 404: The candidate frequency points are not replaced, and the process proceeds to step 406.

 Step 405: Select the available frequency point as the current candidate frequency point.

 Step 406: Determine whether all available frequency points are traversed. If yes, go to step 407. Otherwise, select the next available frequency point and go to step 402.

 Step 407, the current periodic frequency optimization ends.

 After the above process is performed, the current candidate frequency point is used as the actual working frequency of the base station.

Based on the same inventive concept, the embodiment of the present invention further provides a home base station and a frequency point selection device, The principle of the home base station and the frequency point selection device solving the problem is similar to the frequency point selection method. Therefore, the implementation of the home base station and the frequency point selection device can be referred to the implementation of the method, and the repeated description will not be repeated.

 FIG. 5 is a schematic structural diagram of a home base station. As shown in the figure, the home base station may include:

 The strength determining module 501 is configured to determine a signal interference strength received by the base station at each frequency point;

 The load determining module 502 is configured to determine a service load of the other base stations at each frequency point;

 The frequency point determining module 503 is configured to determine the working frequency of the base station according to the signal interference strength received by the base station at each frequency point and the traffic load of other base stations at each frequency point.

 In an implementation, the strength determining module is further configured to: determine, according to the received power of each frequency point on the P-CCPCH of the target base station, the signal interference strength received by the target base station at the corresponding frequency point.

 In the implementation, the load determining module may be further configured to: measure the signal interference intensity of each frequency point on the service time slot to the target base station multiple times within the set time; and each frequency point obtained according to the multiple measurement is in the service time slot. The signal interference strength of the target base station is determined, and the average signal interference strength of each frequency point to the target base station in the service time slot is determined; the average signal interference strength of each frequency point to the target base station on the service time slot is used as the target base station The traffic load of the base station at the corresponding frequency point.

 In an implementation, the load determining module is further configured to: determine, as an optimal frequency point, a frequency point that minimizes a signal interference strength of the target base station, and determine a signal interference strength of the target base station and a signal of the optimal frequency point to the target base station. The difference between the interference intensity is less than the frequency of the set threshold; the frequency point smaller than the set threshold is used as the working frequency to be selected; and other base stations other than the target base station are determined at each candidate operating frequency. Business load on.

 In the implementation, the load determining module may be further configured to: determine, in the initial frequency selection process, a frequency point in which the traffic load is lowest on the uplink service time slot in each frequency point, and a service in the downlink service time slot in each frequency point. The lowest frequency frequency point determining module may be further configured to: determine, in the initial frequency point selection process, when the frequency of the lowest traffic load of the uplink service time slot is the same as the frequency of the lowest traffic load of the downlink service time slot, The frequency point is the working frequency of the base station; when the frequency of the lowest service load of the uplink service time slot is different from the frequency of the lowest service load of the downlink service time slot, the frequency of the interference intensity of the two is determined to be the smallest. This is the operating frequency of the base station.

 In the implementation, the frequency determination module can be further used to perform the following steps:

 A. The frequency point currently used by the target base station is used as the current candidate frequency point;

 B. For an available frequency point, determine whether the following condition 1 or condition 2 is satisfied, if yes, the current available frequency point is taken as the current candidate frequency point, and proceeds to step C; otherwise, directly to step C;

 Condition 1: The signal interference strength of the current available frequency point to the target base station is smaller than the signal interference strength of the current candidate frequency point calibration base station, and the difference between the two is greater than the first threshold;

Condition 2: The uplink traffic load on the current available frequency point is smaller than the uplink traffic load on the current candidate frequency point, and the difference between the two is greater than the second threshold; the downlink traffic load on the current available frequency point is smaller than the current candidate frequency point. Downstream business Load, and the difference between the two is greater than the second threshold; and the signal interference strength of the current available frequency point to the target base station is less than the signal interference strength of the current candidate frequency point to the target base station, and the difference between the two is greater than the third threshold; Wherein the first threshold is greater than the third threshold;

 c. Determine whether all available frequency points are traversed. If yes, use the current candidate frequency point as the optimal frequency point, that is, the working frequency of the target base station. Otherwise, select the next available frequency point and go to step B. .

 In an implementation, the strength determining module and the load determining module may be further configured to: perform measurement when the target base station does not have a user in an RRC connected state.

 FIG. 6 is a schematic structural diagram of a frequency point selection device. As shown in the figure, the device may include:

 The strength determining module 601 is configured to determine a signal interference strength received by the target base station at each frequency point;

 The load determining module 602 is configured to determine a service load of each base station other than the target base station at each frequency point, and the frequency point determining module 603 is configured to: according to the signal interference strength received by the target base station at each frequency point, and the target base station The traffic load of other base stations at each frequency point determines the working frequency of the target base station.

 For convenience of description, the various parts of the above described devices are described in terms of functions divided into various modules or units. Of course, the functions of the various modules or units may be implemented in one or more software or hardware in the practice of the invention.

 It can be seen from the foregoing embodiments that, in the technical solution provided by the embodiment of the present invention, in the cell frequency selection process of the home base station, considering the interference probability of different frequency points, not only the frequency point with lower interference intensity but also the interference is selected. A frequency with a lower probability.

 Further, in the process of selecting the cell frequency of the home base station, the interference measurement of the upper and lower service time slots of different frequency points is performed within a certain period of time, and the average value of the measurement results is used as the frequency selection basis.

 In the TD-LTE (TD-SCDMA Long Term Evolution, TD-SCDMA Long Term Evolution; TD-SCDMA: Time Division Synchronized Code Division Multiple Access) system, reference can also be made to similar ideas, depending on the service time. The probability of interference of the gap, select the frequency with relatively low load.

 The frequency selection method adopted in the prior art only measures the interference power intensity at different frequency points, and does not consider the transmission probability of the interference signal of different frequency points. When the traffic load carried by different frequency points is different, the transmission probability of the interference signals may vary greatly. Therefore, the technical solution provided by the embodiment of the present invention performs the statistics on the interference of the service time slot for a certain period of time, and the probability of the interference of the different frequency points is also taken as a factor for selecting the frequency point, and the cell frequency of the home base station is optimized. The selection strategy further reduces the co-channel interference between the home base station cells.

 Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to magnetic memory, CD-ROM, optical storage, etc.) in which computer usable program code is embodied.

The present invention is directed to a flowchart of a method, apparatus (system), and computer program product according to an embodiment of the present invention. And / or block diagram to describe. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing device to produce a machine for generating instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

 The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

 These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

 Although the preferred embodiment of the invention has been described, it will be apparent to those skilled in the art that <RTIgt; </ RTI> <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

 It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request A frequency point selection method, comprising the steps of:  Determining the signal interference strength of the target base station at each frequency point, and the traffic load of each base station other than the target base station at each frequency point;  The working frequency of the target base station is determined according to the signal interference strength received by the target base station at each frequency point and the traffic load of each base station other than the target base station at each frequency point.  2. The method according to claim 1, wherein, when determining the signal interference strength received by the target base station at each frequency point, receiving at each frequency point on the basic common control physical channel P-CCPCH of the target base station Power determination.  3. The method according to claim 1, wherein determining a service load of each base station other than the target base station at each frequency point includes:  During the set time, the signal interference strength of each frequency point to the target base station on the service time slot is measured multiple times; and the average signal interference intensity of each frequency point to the target base station on the service time slot is determined;  The average signal interference strength of each frequency point to the target base station on the service time slot is used as the traffic load of the base station at the corresponding frequency point other than the target base station.  The method according to claim 3, further comprising: before determining a traffic load of each base station other than the target base station at each frequency point, further comprising:  Taking the frequency point with the smallest signal interference intensity of the target base station as the optimal frequency point, determining that the difference between the signal interference intensity of the target base station and the signal interference intensity of the optimal frequency point to the target base station is less than the set threshold value. Frequency point; a frequency point smaller than the set gate P艮 value is used as the working frequency point to be selected;  The determining the service load of each base station other than the target base station at each frequency point includes:  Determine the traffic load of other base stations other than the target base station at each candidate operating frequency point.  The method according to any one of claims 1 to 4, characterized in that, in the initial frequency selection process, according to the signal interference strength received by the target base station at each frequency point, and other base stations other than the target base station are in each The traffic load at the frequency determines the working frequency of the target base station, including:  Determining a frequency point in which the traffic load is lowest on the uplink service time slot in each frequency point, and a frequency point in which the traffic load is the lowest on the downlink service time slot in each frequency point;  The frequency of the lowest service load of the uplink service time slot is the same as the frequency of the lowest traffic load of the downlink service time slot, and the frequency point is determined to be the working frequency point of the target base station;  When the frequency of the lowest traffic load of the uplink service time slot is different from the frequency of the lowest traffic load of the downlink service time slot, the frequency of the interference intensity of the target base station is determined to be the working frequency of the target base station. . The method according to any one of claims 1 to 4, characterized in that, in the frequency point self-optimization process, according to the interference intensity received by the target base station at each frequency point, and other base stations other than the target base station are in each Traffic load at the frequency Determine the working frequency of the target base station, including:  A. The frequency point currently used by the target base station is used as the current candidate frequency point;  B. For an available frequency point, determine whether the following condition 1 or condition 2 is satisfied, if yes, the current available frequency point is taken as the current candidate frequency point, and proceeds to step C; otherwise, directly to step C;  Condition 1: The signal interference strength of the current available frequency point to the target base station is smaller than the signal interference strength of the current candidate frequency point to the target base station, and the difference between the two is greater than the first threshold;  Condition 2: The uplink traffic load on the current available frequency point is smaller than the uplink traffic load on the current candidate frequency point, and the difference between the two is greater than the second threshold; the downlink traffic load on the current available frequency point is smaller than the current candidate frequency point. The downlink traffic load, and the difference between the two is greater than the second threshold; and the signal interference strength of the current available frequency point to the target base station is smaller than the signal interference strength of the current candidate frequency point to the target base station, and the difference between the two is greater than the first a third threshold; wherein, the first threshold is greater than the third threshold;  c. Determine whether all available frequency points are traversed. If yes, use the current candidate frequency point as the optimal frequency point, that is, the working frequency of the target base station. Otherwise, select the next available frequency point and go to step B.  7. A home base station, comprising:  An intensity determining module, configured to determine a signal interference strength received by the base station at each frequency point;  a load determining module, configured to determine a service load of other base stations at each frequency point;  The frequency point determining module is configured to determine the working frequency of the base station according to the signal interference strength received by the base station at each frequency point and the traffic load of other base stations at each frequency point.  The home base station according to claim 7, wherein the strength determining module is further configured to: when determining the signal interference intensity received by the base station at each frequency point, by using each of the scrambling frequency points in the P- The received power on the CCPCH is determined.  The home base station according to claim 7, wherein the load determining module is further configured to: measure the signal interference strength of each frequency point to the target base station in the service time slot multiple times within the set time; The average signal interference strength of each frequency point to the target base station on the service time slot;  The average signal interference strength of each frequency point to the target base station on the service time slot is used as the traffic load of the base station at the corresponding frequency point other than the target base station.  The home base station according to claim 9, wherein the load determining module is further configured to: determine a signal interference strength to the target base station by using a frequency point that minimizes a signal interference strength of the target base station as an optimal frequency point. The difference between the signal interference strength of the optimal frequency point and the target base station is less than the frequency of the set threshold; the frequency point smaller than the set threshold is used as the candidate operating frequency point; and other than the target base station is determined The traffic load of the base station at each candidate operating frequency. The home base station according to any one of claims 7 to 10, wherein the load determining module is further configured to: In the initial frequency selection process, determining a frequency point in which the traffic load is the lowest on the uplink service time slot in each frequency point, and a frequency point in which the traffic load is the lowest on the downlink service time slot in each frequency point;  The frequency determination module is further used to:  In the initial frequency selection process, when the frequency of the lowest traffic load of the uplink service time slot is the same as the frequency of the lowest traffic load of the downlink service time slot, the frequency point is determined to be the working frequency of the base station; When the frequency of the service load with the lowest time of the service time slot is different from the frequency of the lowest service load of the downlink service time slot, it is determined that the frequency point with the least interference intensity of the two is the working frequency point of the base station.  The home base station according to any one of claims 7 to 10, wherein the frequency point determining module is further configured to perform the following steps:  A. The frequency point currently used by the target base station is used as the current candidate frequency point;  B. For an available frequency point, determine whether the following condition 1 or condition 2 is satisfied, if yes, the current available frequency point is taken as the current candidate frequency point, and proceeds to step C; otherwise, directly to step C;  Condition 1: The signal interference strength of the current available frequency point to the target base station is smaller than the signal interference strength of the current candidate frequency point to the target base station, and the difference between the two is greater than the first threshold;  Condition 2: The uplink traffic load on the current available frequency point is smaller than the uplink traffic load on the current candidate frequency point, and the difference between the two is greater than the second threshold; the downlink traffic load on the current available frequency point is smaller than the current candidate frequency point. The downlink traffic load, and the difference between the two is greater than the second threshold; and the signal interference strength of the current available frequency point to the target base station is smaller than the signal interference strength of the current candidate frequency point to the target base station, and the difference between the two is greater than the third a threshold; wherein, the first threshold is greater than a third threshold;  C. Determine whether all available frequency points are traversed. If yes, use the current candidate frequency point as the optimal frequency point, that is, the working frequency of the target base station. Otherwise, select the next available frequency point, and go to the step.  13. A frequency point selection device, comprising:  An intensity determining module, configured to determine a signal interference strength received by the target base station at each frequency point;  a load determining module, configured to determine a service load of each base station other than the target base station at each frequency point; a frequency point determining module, configured to: according to the signal interference strength received by the target base station at each frequency point, and other base stations other than the target base station The traffic load at each frequency point determines the operating frequency of the target base station.