CN103997763A - Cell handover method and base station controller - Google Patents
Cell handover method and base station controller Download PDFInfo
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Abstract
The invention discloses a cell handover method and a base station controller. When a terminal needs to carry out cell handover, a base station controller obtains M candidate target cells; for each candidate target cell, the respective processing is as follows: according to all recorded historical handover quality evaluation results of the candidate target cell, an average historical handover quality evaluation result of the candidate target cell is determined; on the basis of the obtained level intensity of the candidate target cell, the handover quality prediction result of the candidate target cell this time is determined; a final evaluation result of the candidate target cell is determined based on the average historical handover quality evaluation result and the handover quality prediction result this time of the candidate target cell; and according to the descending order of the values of the final evaluation results, sorting of all candidate target cells is carried out and the candidate target cell ranking the first after sorting is determined as the target cell, and the handover flow is executed. According to the scheme, the handover quality is improved.
Description
Technical Field
The present invention relates to wireless technologies, and in particular, to a cell switching method and a base station controller.
Background
In the prior art, when a terminal needs to perform cell handover, a Base Station Controller (BSC) to which the terminal belongs performs the following processing:
1) determining a plurality of candidate target cells;
2) carrying out level punishment on each candidate target cell according to the switching success rate of each candidate target cell within the past preset time, namely, reducing the level intensity of each candidate target cell to different degrees according to the switching success rate so as to achieve the purposes of reducing the priority of the candidate target cell with higher switching failure rate and further improving the switching success rate;
3) and sequencing the candidate target cells subjected to level punishment according to the sequence of the level intensity from high to low, taking the candidate target cell at the first position after sequencing as a target cell, and executing a switching process.
However, the above method has certain problems in practical applications, such as: when selecting the target cell, only the current level strength and handover success rate of the candidate target cell are considered, but not more factors such as historical handover quality, such as time delay and link quality in the handover process which can be perceived by the user, and whether a call drop occurs in the handover process and after the handover is completed, etc., are not considered, so that the selected target cell may be perceived badly, that is, not optimal, for the user, and the handover quality is reduced.
Disclosure of Invention
In view of the above, the present invention provides a cell handover method and a base station controller, which can improve handover quality.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a cell handover method, comprising:
when a terminal is determined to need to carry out cell switching, a base station controller acquires M candidate target cells, wherein M is a positive integer greater than 1;
for each candidate target cell, the base station controller respectively performs the following processing:
determining an average historical switching quality evaluation result of the candidate target cell according to the recorded historical switching quality evaluation results of the candidate target cell;
determining the current switching quality prediction result of the candidate target cell according to the acquired level intensity of the candidate target cell;
determining the final evaluation result of the candidate target cell according to the average historical switching quality evaluation result and the current switching quality prediction result of the candidate target cell;
and the base station controller sorts all candidate target cells according to the descending order of the values of the final evaluation result, determines the candidate target cell at the first position after sorting as the target cell, and executes the switching process.
A base station controller comprising:
the first processing module is used for acquiring M candidate target cells when a terminal is determined to need cell switching, wherein M is a positive integer greater than 1;
a second processing module, configured to perform the following processing for each candidate target cell:
determining an average historical switching quality evaluation result of the candidate target cell according to the recorded historical switching quality evaluation results of the candidate target cell; determining the current switching quality prediction result of the candidate target cell according to the acquired level intensity of the candidate target cell; determining the final evaluation result of the candidate target cell according to the average historical switching quality evaluation result and the current switching quality prediction result of the candidate target cell;
and sequencing the candidate target cells according to the sequence of the values of the final evaluation result from large to small, determining the candidate target cell at the first position after sequencing as the target cell, and executing a switching process.
Therefore, by adopting the scheme of the invention, when the target cell is selected, the level intensity of each candidate target cell, the historical switching quality evaluation result and the like are comprehensively considered, namely the optimal cell is selected from each candidate target cell as the target cell by synthesizing the factors, so that the switching quality is improved, the user experience is improved and the like.
Drawings
Fig. 1 is a flowchart of a cell switching method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating the meaning of each bit in the handover quality indication according to the present invention.
Fig. 3 is a schematic diagram of a value-taking mode of each bit in the handover quality indication when the target cell is congested with resources.
Fig. 4 is a schematic diagram of a value-taking manner of each bit in the handover quality indication according to an example of the present invention.
Detailed Description
Aiming at the problems in the prior art, the invention provides an improved cell switching scheme which can improve the switching quality.
In order to make the technical solution of the present invention clearer and more obvious, the solution of the present invention is further described in detail below by referring to the drawings and examples.
Fig. 1 is a flowchart of a cell switching method according to an embodiment of the present invention. As shown in fig. 1, includes:
step 11: when a terminal is determined to need to perform cell switching, a base station controller acquires M candidate target cells, wherein M is a positive integer greater than 1.
How the base station controller determines whether the terminal needs to perform cell handover, and how to determine M candidate target cells are prior art. In addition, the specific value of M can be determined according to actual needs.
Step 12: and (4) for each candidate target cell x, the base station controller respectively processes according to the modes shown in the steps 13-15.
For convenience of description, in the present embodiment, each candidate target cell is represented by a candidate target cell x.
Step 13: and the base station controller determines the average historical switching quality evaluation result of the candidate target cell x according to the recorded historical switching quality evaluation results of the candidate target cell x.
In this step, to ensure timeliness of the calculation result, the base station controller may first determine whether the number of generation times in a time period from T to T-Tmax in each recorded historical handover quality evaluation result of the candidate target cell x is greater than N, where N is a positive integer greater than 1, and a specific value may be determined according to actual needs, and T represents the current time.
If so, calculating to obtain the average historical switching quality evaluation result of the candidate target cell x by using the N historical switching quality evaluation results with the generation time closest to the current timeOtherwise, calculating by using each historical switching quality evaluation result of which the generation time is positioned in the time period from T to T-Tmax
Wherein, for any historical switching quality evaluation result, the farther from the current time, the smaller the influence on the calculated average historical switching quality evaluation result.
Preferably, the first and second liquid crystal films are made of a polymer, <math>
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wherein N' represents a calculationThe number of historical handover quality evaluation results, Δ t, used in the processiIndicating the interval between the time of generation of the ith historical handover quality assessment result and the current timeThe length of time is,indicating the nth' historical handover quality assessment results,shows that the influence factor of the switching generated before Tmax on the calculation result is reduced to e-aAnd a represents a positive integer of a predetermined value. The specific values of Tmax and a can be determined according to actual needs, for example, a can be 3.
The base station controller determines whether the number of the historical handover quality evaluation results of the candidate target cell x whose generation time is within the time period from T to T-Tmax is greater than N, mainly to prevent the number of the historical handover quality evaluation results participating in the calculation from being too large, thereby increasing the complexity of the calculation
Step 14: and the base station controller determines the switching quality prediction result of the candidate target cell x according to the acquired level intensity of the candidate target cell x.
In the step, the base station controller determines the value range of the level intensity of the candidate target cell x;
if it belongs to the first value range>A, calculating to obtain a current switching quality prediction result H of the candidate target cell x0：H0=16-0*2；
If the value falls within the second value range (-B, -A)]Then calculating to obtain the current switching quality prediction result H of the candidate target cell x0：H0=16-1*2；
If the value falls within the third value range (-C, -B)]Then calculating to obtain the candidate target cellx prediction result H of quality of this handover0：H0=16-2*2；
If the value falls within the fourth value range (-D, -C)]Then calculating to obtain the current switching quality prediction result H of the candidate target cell x0：H0=16-3*2；
Wherein A, B, C and D are both positive integers, and D > C > B > A.
A. B, C and D can be determined according to actual needs, generally, A is 60, B is 75, C is 90, and D is 110.
The different value ranges respectively correspond to different link qualities, for example, the link quality corresponding to the first value range is "excellent", the link quality corresponding to the second value range is "good", the link quality corresponding to the third value range is "normal", and the link quality corresponding to the fourth value range is "poor".
Different value ranges respectively correspond to different values of R0, namely 0, 1, 2 or 3, so that the multiplication of R0 by 2 is required for weight matching with bits 1 to bit2 in the switching quality indication described later.
Step 15: and the base station controller determines the final evaluation result of the candidate target cell x according to the average historical switching quality evaluation result of the candidate target cell x and the current switching quality prediction result.
In this step, the base station controller may calculate the final evaluation result of the candidate target cell x
Step 16: and the base station controller sorts all candidate target cells according to the descending order of the values of the final evaluation result, determines the candidate target cell at the first position after sorting as the target cell, and executes the switching process.
Specifically, for two candidate target cells whose final evaluation results coincide, the candidate target cell having the greater level intensity may be ranked in front.
How to perform the handover procedure is prior art.
In addition, the embodiment shown in fig. 1 may further include: and generating a switching quality evaluation result corresponding to the switching, recording the switching quality evaluation result as a historical switching quality evaluation result when the target cell is determined as a candidate target cell by the base station controller next time, and specifically implementing the following steps 1) to 5).
1) When the terminal needs to switch the cell, the base station controller generates a 5-bit switching quality indication.
Fig. 2 is a schematic diagram illustrating the meaning of each bit in the handover quality indication according to the present invention. As shown in fig. 2, bit4 is a congestion indicating bit, bit3 is a call drop indicating bit, bit2 and bit1 are quality difference indicating bits, and bit0 is a handover failure indicating bit; initially, setting the value of each indicator bit to be 0; bits 0-3 are switching perception indicator bits, depending on the radio environment, and bit4 is a congestion indicator bit, depending on the system resources.
2) The base station controller determines whether the target cell has resource congestion, if so, the value of a congestion indicator bit is set to be 1, a binary number value of 5 bits is converted into a 10-system numerical value, and the converted 10-system numerical value is subtracted by 16 to obtain a switching quality evaluation result corresponding to the switching; otherwise, the value of the congestion indication bit is set to 0.
In the existing normal switching process, a base station controller applies for channel resources to a target cell, sends a switching command after confirming that resources are reserved in the target cell, and starts the switching process, but when the original link is degraded and emergency switching occurs, the resource application step is omitted and the target cell is directly switched, and under the condition, switching failure is easy to occur due to resource congestion of the target cell.
In order to improve the success rate of the handover, in the scheme of the invention, a congestion indication bit can be set in the handover quality indication to record the resource congestion condition of the cell and reduce the priority of the candidate target cell which fails in the handover due to congestion.
In practical application, if the base station controller determines that the target cell has resource congestion and the channel activation fails, the value of the congestion indicator bit may be set to 1, and the handover quality evaluation result corresponding to the handover is obtained.
Fig. 3 is a schematic diagram of a value-taking mode of each bit in the handover quality indication when the target cell is congested with resources. As shown in fig. 3, the binary value 10000 is converted into a 10-ary value 16, and then 16-16 is used to obtain the handover quality evaluation result 0 corresponding to the handover, which is the worst handover quality case.
Otherwise, if the base station controller determines that the target cell is not congested, the value of the congestion indication bit may be set to 0, and the subsequent processing is continued.
If the original cell (the cell where the terminal is located before handover) and the target cell belong to the same base station controller, the base station controller can determine that resource congestion occurs in the target cell when receiving a Channel Activation Negative Acknowledgement (NACK) message sent by the target cell; if the original cell and the target are smaller than the base station controller which does not belong to the same base station controller, when the base station controller receives a Handover Reject (Handover Reject) message sent by a Mobile Switching Center (MSC), it can be considered that resource congestion occurs in the target cell.
3) The base station controller determines whether the switching is successful, if so, the value of the switching failure indication bit is set to be 0, otherwise, the value of the switching failure indication bit is set to be 1.
In practical application, if the original cell and the target cell belong to the same base station controller, when the base station controller receives a Handover Complete message sent by the target cell, the Handover can be considered to be successful; if the original cell and the target cell do not belong to the same base station controller, when the base station controller receives a Clear Command (Clear Command) sent by the MSC, because the Handover Success (Handover Success), the Handover is considered to be successful.
If the base station controller receives a Handover Failure message from the terminal, or does not receive a Handover Complete message or a Clear Command message before a T3103 timer of the base station controller expires after a Handover Command message is sent to the terminal, the base station controller may consider that the Handover is failed.
If the switching is determined to be successful, the base station controller can set the value of the switching failure indication bit to be 0, otherwise, to be 1.
4) The base station controller determines the value range of the level intensity of the target cell;
if the quality difference belongs to the first value range > -A, setting the value of the quality difference indicating bit to 00;
if the quality difference indicator belongs to a second value range (-B, -A), setting the value of the quality difference indicator bit to be 01;
if the quality difference indicator belongs to a third value range (-C, -B), setting the value of the quality difference indicator bit to 10;
if the quality difference indicator belongs to a fourth value range (-D, -C), setting the value of the quality difference indicator bit to be 11;
wherein A, B, C and D are both positive integers, and D > C > B > A; as mentioned above, typically, a has a value of 60, B has a value of 75, C has a value of 90, and D has a value of 110.
The following table can be obtained by combining the values of R0 introduced in step 14, etc.:
| R0 | intensity of electric level | bit2 | bit1 | Link quality |
| 0 | >-60 | 0 | 0 | Superior food |
| 1 | (-75,-60] | 0 | 1 | Good wine |
| 2 | (-90,-75] | 1 | 0 | Is normal |
| 3 | (-110,-90] | 1 | 1 | Difference (D) |
Table-relationship between parameters
5) The base station controller determines whether one of the following conditions has occurred: and in the switching process, the call is dropped after the switching is successful, and the switching time delay is overtime, if so, the value of the call drop indicating bit is set to be 1, otherwise, the value of the call drop indicating bit is set to be 0, the binary value of 5 bits is converted into a 10-system numerical value, and the converted 10-system numerical value is subtracted by 16 to obtain a switching quality evaluation result corresponding to the switching.
In practical application, if it is determined from the base station controller that Handover needs to be performed before a Handover Complete message or a Clear Command message is received, a Clear Request (Clear Request) message reported by the terminal is received, or the terminal fails to attempt to return to an original Traffic Channel (TCH) after Handover fails, and enters an Idle (Idle) state, or no message is received before a timer T3103 times out, and an original cell link is released, it can be considered that a call drop occurs during Handover.
If Clear Request information reported by the terminal in the target cell is received within a preset time length T3 after the switching is completed, the terminal can be considered to have a call drop immediately after being successfully switched to the target cell due to a link; the rule is suitable for the condition that the original cell and the target cell belong to the same base station controller, and for the condition that the original cell and the target cell do not belong to the same base station controller, the time delay of user plane interruption caused by switching is considered to be usually very long, so equivalent analysis can be carried out through time delay evaluation.
Specifically, the base station controller obtains the handover delay in the handover process: receiving a duration of an interval between receiving a Handover Complete message or a Clear Command message and sending the Handover Command message, and if the switching delay is greater than a preset threshold value, determining that the switching delay is overtime; the specific value of the threshold may be determined according to actual needs, and generally, may be between the timing duration of the timer (T3124) for terminal access attempt × the maximum number of times of terminal access attempt and the timing duration of the timer T3103.
If the call drop occurs in the switching process, the call drop occurs after the switching is successful, or the switching time delay is overtime, the base station controller can set the value of the call drop indicating bit to be 1, otherwise, the value is set to be 0.
For example, the following steps are carried out:
fig. 4 is a schematic diagram of a value-taking manner of each bit in the handover quality indication according to an example of the present invention. As shown in fig. 4, the handover quality indication indicates that: the target cell has no resource congestion, is successfully switched, has a dropped call or overtime switching delay, has the level intensity of the target cell within the value range of (-90, -75), and the corresponding switching quality evaluation result is that 16-12 is equal to 4.
It should be noted that, the above-described base station controller and MSC refer to the base station controller and MSC to which the original cell belongs.
This completes the description of the method embodiment of the present invention.
Based on the above introduction, the present invention also discloses a base station controller, which comprises:
the first processing module is used for acquiring M candidate target cells when a terminal is determined to need cell switching, wherein M is a positive integer greater than 1;
a second processing module, configured to perform the following processing for each candidate target cell:
determining an average historical switching quality evaluation result of the candidate target cell according to the recorded historical switching quality evaluation results of the candidate target cell; determining the current switching quality prediction result of the candidate target cell according to the acquired level intensity of the candidate target cell; determining the final evaluation result of the candidate target cell according to the average historical switching quality evaluation result and the current switching quality prediction result of the candidate target cell;
and sequencing the candidate target cells according to the sequence of the values of the final evaluation result from large to small, determining the candidate target cell at the first position after sequencing as the target cell, and executing a switching process.
The base station controller may further include: and the third processing module is used for generating a switching quality evaluation result corresponding to the switching, recording the switching quality evaluation result and taking the switching quality evaluation result as a historical switching quality evaluation result when the target cell is determined as a candidate target cell by the base station controller next time.
Specifically, the third processing module determines that the terminal needs to perform cell switching, and generates a 5-bit switching quality indication, wherein bit4 is a congestion indication bit, bit3 is a dropped call indication bit, bit2 and bit1 are quality difference indication bits, and bit0 is a switching failure indication bit; initially, setting the value of each indicator bit to be 0;
determining whether the target cell has resource congestion, if so, setting the value of a congestion indicator bit to be 1, converting a binary value of 5 bits into a 10-system numerical value, and subtracting the converted 10-system numerical value from 16 to obtain a switching quality evaluation result corresponding to the switching;
otherwise, setting the value of the congestion indication bit to be 0;
determining whether the switching is successful, if so, setting the value of the switching failure indication bit to be 0, otherwise, setting the value of the switching failure indication bit to be 1;
determining a value range to which the level intensity of the target cell belongs, if the level intensity of the target cell belongs to a first value range > -A, setting the value of the quality difference indicator bit to 00, if the level intensity of the target cell belongs to a second value range (-B, -A), setting the value of the quality difference indicator bit to 01, if the level intensity of the target cell belongs to a third value range (-C, -B), setting the value of the quality difference indicator bit to 10, and if the level intensity of the target cell belongs to a fourth value range (-D, -C), setting the value of the quality difference indicator bit to 11, wherein A, B, C and D are positive integers, and D > C > B > A;
determining whether one of the following occurs: and in the switching process, the call is dropped after the switching is successful, and the switching time delay is overtime, if so, the value of the call drop indicating bit is set to be 1, otherwise, the value of the call drop indicating bit is set to be 0, the binary value of 5 bits is converted into a 10-system numerical value, and the converted 10-system numerical value is subtracted by 16 to obtain a switching quality evaluation result corresponding to the switching.
The second processing module may further include:
the first processing unit is used for determining an average historical switching quality evaluation result of each candidate target cell according to the recorded historical switching quality evaluation results of the candidate target cells;
the second processing unit is used for determining a current switching quality prediction result of each candidate target cell according to the acquired level intensity of the candidate target cell;
the third processing unit is used for determining the final evaluation result of each candidate target cell according to the average historical switching quality evaluation result and the current switching quality prediction result of the candidate target cell;
and the fourth processing unit is used for sequencing all the candidate target cells according to the sequence of the values of the final evaluation result from large to small, determining the candidate target cell at the first position after sequencing as the target cell, and executing the switching process.
Wherein,
the first processing unit respectively performs the following processing for each candidate target cell:
determining whether the number of the generation time in the time period from T to T-Tmax in the recorded historical switching quality evaluation results of the candidate target cell is greater than N, wherein N is a positive integer greater than 1, and T represents the current time;
if yes, calculating to obtain the average historical switching quality evaluation result of the candidate target cell by using the N historical switching quality evaluation results with the generation time closest to the current timeOtherwise, calculating by using each historical switching quality evaluation result of which the generation time is positioned in the time period from T to T-Tmax
Wherein, for any historical switching quality evaluation result, the farther from the current time, the smaller the influence on the calculated average historical switching quality evaluation result.
Wherein N' represents a calculationThe number of historical handover quality evaluation results, Δ t, used in the processiA time length indicating an interval between the generation time of the ith historical switching quality evaluation result and the current time,and (b) representing the Nth historical switching quality evaluation result, wherein a represents a positive integer of a preset value.
The second processing unit respectively performs the following processing for each candidate target cell:
determining the value range of the level intensity of the candidate target cell;
if it belongs to the first value range>A, calculating to obtain the quality prediction result H of the current switching of the candidate target cell0：H0=16-0*2；
If the value falls within the second value range (-B, -A)]Then, the prediction result H of the quality of the current switching of the candidate target cell is calculated0：H0=16-1*2；
If the value falls within the third value range (-C, -B)]Then, the prediction result H of the quality of the current switching of the candidate target cell is calculated0：H0=16-2*2；
If the value falls within the fourth value range (-D, -C)]Then, the prediction result H of the quality of the current switching of the candidate target cell is calculated0：H0=16-3*2；
Wherein A, B, C and D are both positive integers, and D > C > B > A.
The third processing unit respectively performs the following processing for each candidate target cell:
calculating to obtain the final evaluation result of the candidate target cell
for the specific work flow of the above device embodiment, please refer to the corresponding description in the above method embodiment, which is not described herein again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (15)
1. A method of cell handover, comprising:
when a terminal is determined to need to carry out cell switching, a base station controller acquires M candidate target cells, wherein M is a positive integer greater than 1;
for each candidate target cell, the base station controller respectively performs the following processing:
determining an average historical switching quality evaluation result of the candidate target cell according to the recorded historical switching quality evaluation results of the candidate target cell;
determining the current switching quality prediction result of the candidate target cell according to the acquired level intensity of the candidate target cell;
determining the final evaluation result of the candidate target cell according to the average historical switching quality evaluation result and the current switching quality prediction result of the candidate target cell;
and the base station controller sorts all candidate target cells according to the descending order of the values of the final evaluation result, determines the candidate target cell at the first position after sorting as the target cell, and executes the switching process.
2. The method of claim 1,
the method further comprises the following steps: and generating a switching quality evaluation result corresponding to the switching, recording the switching quality evaluation result as a historical switching quality evaluation result when the target cell is determined as a candidate target cell by the base station controller next time.
3. The method according to claim 2, wherein the generating of the handover quality assessment result corresponding to the current handover comprises:
when the terminal is determined to need to perform cell switching, generating a 5-bit switching quality indication, wherein bit4 is a congestion indication bit, bit3 is a call drop indication bit, bit2 and bit1 are quality difference indication bits, and bit0 is a switching failure indication bit; initially, setting the value of each indicator bit to be 0;
determining whether the target cell has resource congestion, if so, setting the value of the congestion indicator bit to be 1, converting the binary number of 5 bits into a 10-system numerical value, and subtracting the converted 10-system numerical value from 16 to obtain a switching quality evaluation result corresponding to the switching;
otherwise, setting the value of the congestion indication bit to be 0;
determining whether the switching is successful, if so, setting the value of the switching failure indication bit to be 0, otherwise, setting the value of the switching failure indication bit to be 1;
determining a value range to which the level intensity of the target cell belongs, if the level intensity of the target cell belongs to a first value range > -A, setting the value of the quality difference indicator bit to 00, if the level intensity of the target cell belongs to a second value range (-B, -A), setting the value of the quality difference indicator bit to 01, if the level intensity of the target cell belongs to a third value range (-C, -B), setting the value of the quality difference indicator bit to 10, and if the level intensity of the target cell belongs to a fourth value range (-D, -C), setting the value of the quality difference indicator bit to 11, wherein A, B, C and D are positive integers, and D > C > B > A;
determining whether one of the following occurs: in the switching process, the call is dropped after the switching is successful, and the switching time delay is overtime, if the call is dropped, the value of the call drop indicating bit is set to be 1, otherwise, the value of the call drop indicating bit is set to be 0; and converting the binary value of 5 bits into a 10-system numerical value, and subtracting the converted 10-system numerical value by 16 to obtain a switching quality evaluation result corresponding to the switching.
4. The method of claim 2 or 3, wherein determining the average historical handover quality assessment result for the candidate target cell comprises:
determining whether the number of the generation time in the time period from T to T-Tmax in the recorded historical switching quality evaluation results of the candidate target cell is greater than N, wherein N is a positive integer greater than 1, and T represents the current time;
if yes, calculating to obtain the average historical switching quality evaluation result of the candidate target cell by using the N historical switching quality evaluation results with the generation time closest to the current timeOtherwise, calculating by using each historical switching quality evaluation result of which the generation time is positioned in the time period from T to T-Tmax
Wherein, for any historical switching quality evaluation result, the farther from the current time, the smaller the influence on the calculated average historical switching quality evaluation result.
5. The method of claim 4,
wherein N' represents a calculationThe number of historical handover quality evaluation results, Δ t, used in the processiA time length indicating an interval between the generation time of the ith historical switching quality evaluation result and the current time,and (b) representing the Nth historical switching quality evaluation result, wherein a represents a positive integer of a preset value.
6. The method of claim 5, wherein the determining the current handover quality prediction result of the candidate target cell comprises:
determining the value range of the level intensity of the candidate target cell;
if it belongs to the first value range>A, calculating to obtain the quality prediction result H of the current switching of the candidate target cell0：H0=16-0*2；
If the value falls within the second value range (-B, -A)]Then, the prediction result H of the quality of the current switching of the candidate target cell is calculated0：H0=16-1*2；
If the value falls within the third value range (-C, -B)]Then, the prediction result H of the quality of the current switching of the candidate target cell is calculated0：H0=16-2*2；
If the value falls within the fourth value range (-D, -C)]Then, the prediction result H of the quality of the current switching of the candidate target cell is calculated0：H0=16-3*2；
Wherein A, B, C and D are both positive integers, and D > C > B > A.
7. The method of claim 6, wherein determining the final evaluation result of the candidate target cell comprises:
calculating to obtain the final evaluation result of the candidate target cell
8. a base station controller, comprising:
the first processing module is used for acquiring M candidate target cells when a terminal is determined to need cell switching, wherein M is a positive integer greater than 1;
a second processing module, configured to perform the following processing for each candidate target cell:
determining an average historical switching quality evaluation result of the candidate target cell according to the recorded historical switching quality evaluation results of the candidate target cell; determining the current switching quality prediction result of the candidate target cell according to the acquired level intensity of the candidate target cell; determining the final evaluation result of the candidate target cell according to the average historical switching quality evaluation result and the current switching quality prediction result of the candidate target cell;
and sequencing the candidate target cells according to the sequence of the values of the final evaluation result from large to small, determining the candidate target cell at the first position after sequencing as the target cell, and executing a switching process.
9. The base station controller of claim 8,
the base station controller further comprises: and the third processing module is used for generating a switching quality evaluation result corresponding to the switching, recording the switching quality evaluation result and taking the switching quality evaluation result as a historical switching quality evaluation result when the target cell is determined as a candidate target cell by the base station controller next time.
10. The base station controller of claim 9,
the third processing module determines that the terminal needs to perform cell switching and generates a 5-bit switching quality indication, wherein bit4 is a congestion indication bit, bit3 is a call drop indication bit, bit2 and bit1 are quality difference indication bits, and bit0 is a switching failure indication bit; initially, setting the value of each indicator bit to be 0;
determining whether the target cell has resource congestion, if so, setting the value of the congestion indicator bit to be 1, converting the binary number of 5 bits into a 10-system numerical value, and subtracting the converted 10-system numerical value from 16 to obtain a switching quality evaluation result corresponding to the switching;
otherwise, setting the value of the congestion indication bit to be 0;
determining whether the switching is successful, if so, setting the value of the switching failure indication bit to be 0, otherwise, setting the value of the switching failure indication bit to be 1;
determining a value range to which the level intensity of the target cell belongs, if the level intensity of the target cell belongs to a first value range > -A, setting the value of the quality difference indicator bit to 00, if the level intensity of the target cell belongs to a second value range (-B, -A), setting the value of the quality difference indicator bit to 01, if the level intensity of the target cell belongs to a third value range (-C, -B), setting the value of the quality difference indicator bit to 10, and if the level intensity of the target cell belongs to a fourth value range (-D, -C), setting the value of the quality difference indicator bit to 11, wherein A, B, C and D are positive integers, and D > C > B > A;
determining whether one of the following occurs: in the switching process, the call is dropped after the switching is successful, and the switching time delay is overtime, if the call is dropped, the value of the call drop indicating bit is set to be 1, otherwise, the value of the call drop indicating bit is set to be 0; and converting the binary value of 5 bits into a 10-system numerical value, and subtracting the converted 10-system numerical value by 16 to obtain a switching quality evaluation result corresponding to the switching.
11. The base station controller according to claim 9 or 10, wherein the second processing module comprises:
the first processing unit is used for determining an average historical switching quality evaluation result of each candidate target cell according to the recorded historical switching quality evaluation results of the candidate target cells;
the second processing unit is used for determining a current switching quality prediction result of each candidate target cell according to the acquired level intensity of the candidate target cell;
the third processing unit is used for determining the final evaluation result of each candidate target cell according to the average historical switching quality evaluation result and the current switching quality prediction result of the candidate target cell;
and the fourth processing unit is used for sequencing all the candidate target cells according to the sequence of the values of the final evaluation result from large to small, determining the candidate target cell at the first position after sequencing as the target cell, and executing the switching process.
12. The base station controller of claim 11,
the first processing unit respectively performs the following processing for each candidate target cell:
determining whether the number of the generation time in the time period from T to T-Tmax in the recorded historical switching quality evaluation results of the candidate target cell is greater than N, wherein N is a positive integer greater than 1, and T represents the current time;
if yes, calculating to obtain the average historical switching quality evaluation result of the candidate target cell by using the N historical switching quality evaluation results with the generation time closest to the current timeOtherwise, calculating by using each historical switching quality evaluation result of which the generation time is positioned in the time period from T to T-Tmax
Wherein, for any historical switching quality evaluation result, the farther from the current time, the smaller the influence on the calculated average historical switching quality evaluation result.
13. The base station controller of claim 12,
wherein N' represents a calculationThe number of historical handover quality evaluation results, Δ t, used in the processiA time length indicating an interval between the generation time of the ith historical switching quality evaluation result and the current time,and (b) representing the Nth historical switching quality evaluation result, wherein a represents a positive integer of a preset value.
14. The base station controller of claim 13,
the second processing unit respectively performs the following processing for each candidate target cell:
determining the value range of the level intensity of the candidate target cell;
if it belongs to the first value range>A, calculating to obtain the quality prediction result H of the current switching of the candidate target cell0：H0=16-0*2；
If the value falls within the second value range (-B, -A)]Then, the prediction result H of the quality of the current switching of the candidate target cell is calculated0：H0=16-1*2；
If the value falls within the third value range (-C, -B)]Then, the prediction result H of the quality of the current switching of the candidate target cell is calculated0：H0=16-2*2；
If the value falls within the fourth value range (-D, -C)]Then, the prediction result H of the quality of the current switching of the candidate target cell is calculated0：H0=16-3*2；
Wherein A, B, C and D are both positive integers, and D > C > B > A.
15. The base station controller of claim 14,
the third processing unit respectively performs the following processing for each candidate target cell:
calculating to obtain the final evaluation result of the candidate target cell
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