CN105828392A - Circuit switched fallback method and device - Google Patents
Circuit switched fallback method and device Download PDFInfo
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- CN105828392A CN105828392A CN201510003001.6A CN201510003001A CN105828392A CN 105828392 A CN105828392 A CN 105828392A CN 201510003001 A CN201510003001 A CN 201510003001A CN 105828392 A CN105828392 A CN 105828392A
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Abstract
The invention discloses a circuit switched fallback (CSFB) method comprising the following steps: receiving an extended service request ESR sent by a terminal, and judging whether the terminal meets a single-frequency down-sending condition; when determining that the terminal meets the single-frequency down-sending condition, instructing a base station to send the frequency information of a first cell down to the terminal; or, when determining that the terminal cannot meet the single-frequency down-sending condition, acquiring the frequency information of a priority cell, and instructing the base station to send the frequency information of the priority cell down to the terminal. The invention further discloses a CSFB device.
Description
Technical Field
The present invention relates to the technical field of Long Term Evolution (LTE) wireless networks and core networks, and in particular, to a method and an apparatus for Circuit Switched Fallback (CSFB).
Background
Voice services do not exist in the existing LTE network, and the way to implement voice services is usually to drop voice services back to the second Generation mobile communication technology (2G) or third Generation mobile communication technology (3G, 3rd-Generation) network through the CSFB technology. When a terminal resides in an LTE network and needs to perform voice service, LTE network resources need to be released first, and then the neighbor frequency points are measured according to the configured 2/3G neighbor frequency points; and selecting the cell with the strongest signal according to the measurement result to perform cell synchronization and system message reception, and initiating random access in the cell meeting the network residence condition. However, the frequency point measurement brings a certain network delay, thereby affecting the user perception; meanwhile, if the cell has the strongest signal but has an abnormal state, and has problems of warning, congestion or voice quality, etc., normal voice service cannot be realized, resulting in call failure.
Disclosure of Invention
In view of this, embodiments of the present invention are expected to provide a CSFB method and apparatus, which can improve the success rate of connection of a terminal call, reduce connection delay, and improve user perception.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
the embodiment of the invention provides a CSFB method, which comprises the following steps:
receiving an Extended Service Request (ESR) sent by a terminal, and judging whether the terminal meets a single frequency point issuing condition;
when the condition of sending a single frequency point is determined to be met, indicating a base station to send frequency point information of a first cell to the terminal; or when the condition of sending the single frequency point is determined not to be met, obtaining the frequency point information of the priority cell, and instructing the base station to send the frequency point information of the priority cell to the terminal.
In the above scheme, the single frequency point issuing condition includes: the last voice call information of the terminal is stored, the current LTE cell is the same as the LTE cell where the terminal last performs voice call, and the cell accessed when the terminal last performs voice call is in the list of the priority cell.
In the above scheme, when it is determined that the single frequency point issuing condition is not satisfied, acquiring the frequency point information of the priority cell includes:
and when the condition that the single frequency point issuing condition is not met is determined, reading and analyzing a measurement report MR of the 2/3G network neighboring cell configured by the current LTE cell, adding the cell with the MR problem into a blacklist, and identifying the cell with the MR normal as a priority cell.
In the above solution, the cell in which the MR has a problem includes: and the MR is a cell with the part with poor call quality exceeding a preset threshold value.
In the above scheme, after the instructing base station issues the frequency point information of the first cell to the terminal, or after the instructing base station issues the frequency point information of the priority cell to the terminal, the method further includes:
and recording the call information of the terminal during the voice call.
The embodiment of the invention also provides a CSFB device, which comprises: a judging module and an indicating module; wherein,
the judging module is used for receiving an ESR (extended service request) sent by a terminal and judging whether the terminal meets a single frequency point issuing condition;
the indication module is used for indicating the base station to issue the frequency point information of the first cell to the terminal when the single frequency point issuing condition is met; or when the single frequency point issuing condition is not met, acquiring the frequency point information of the priority cell, and instructing the base station to issue the frequency point information of the priority cell to the terminal.
In the above scheme, the single frequency point issuing condition includes: the last voice call information of the terminal is stored, the current LTE cell is the same as the LTE cell where the terminal last performs voice call, and the cell accessed when the terminal last performs voice call is in the list of the priority cell.
In the foregoing solution, the indication module is specifically configured to, when the condition for issuing a single frequency point is not met, read and analyze a measurement report MR of an 2/3G network neighboring cell configured by a current LTE cell, add a cell with an MR problem to a blacklist, and identify a cell with an MR normal as a priority cell.
In the above solution, the cell in which the MR has a problem includes: and the MR is a cell with the part with poor call quality exceeding a preset threshold value.
In the above scheme, the device further includes a recording module, configured to record call information of the terminal during the current voice call.
The CSFB method and the CSFB device provided by the embodiment of the invention receive ESR sent by a terminal and judge whether the terminal meets a single frequency point issuing condition; when the condition of sending a single frequency point is determined to be met, indicating a base station to send frequency point information of a first cell to the terminal; when the condition of sending the single frequency point is determined not to be met, obtaining the frequency point information of the priority cell, and indicating a base station to send the frequency point information of the priority cell to the terminal; thus, when the condition of sending the single frequency point is determined to be met, the base station is instructed to send the frequency point information of the first cell to the terminal; when the condition of sending the single frequency point is determined not to be met, indicating a base station to send the frequency point information of the priority cell to the terminal; the success rate of connection of terminal calls can be improved, the connection time delay is reduced, and the user perception is improved.
Drawings
FIG. 1 is a flow chart of a CSFB method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a CSFB method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a device structure of a CSFB according to an embodiment of the present invention.
Detailed Description
In the embodiment of the invention, ESR sent by a terminal is received, and whether the terminal meets a single frequency point issuing condition is judged; when the condition of sending a single frequency point is determined to be met, indicating a base station to send frequency point information of a first cell to the terminal; and when the condition of sending the single frequency point is determined not to be met, obtaining the frequency point information of the priority cell, and indicating the base station to send the frequency point information of the priority cell to the terminal.
Fig. 1 is a schematic diagram of a method flow of CSFB according to an embodiment of the present invention, and as shown in fig. 1, the method flow of CSFB according to the embodiment of the present invention includes:
step 101: receiving ESR sent by a terminal, and judging whether the terminal meets a single frequency point issuing condition or not;
before this step, the terminal resides in the LTE network and has a voice service requirement, and sends a CSFB request to the base station eNodeB to establish a Radio Resource Control (RRC) data bearer link with the LTE network.
A Mobile Management Entity (MME) receives ESR messages sent by a terminal through an S1 port, and judges whether the terminal meets a single frequency point issuing condition;
wherein, the single frequency point issuing condition comprises: the MME stores the last voice call information of the terminal, the current LTE cell is the same as the LTE cell where the terminal last performs voice call, and the cell accessed by the terminal last performs voice call is in the list of the priority cell; here, the last voice call information of the terminal includes: the terminal comprises the last voice call quality information of the terminal, the cell number of the access cell of the terminal which carries out the last voice call, the LTE cell information of the terminal which carries out the last voice call, and the like.
Step 102: when the condition of sending a single frequency point is determined to be met, indicating a base station to send frequency point information of a first cell to the terminal; or when the condition of sending the single frequency point is determined not to be met, obtaining the frequency point information of the priority cell and indicating the base station to send the frequency point information of the priority cell to the terminal;
here, when it is determined that the single frequency point issuing condition is satisfied, the instructing the base station to issue the first cell frequency point information to the terminal includes: sending a fallback indication containing the first cell frequency point information to the base station so that the base station issues the first cell frequency point information to the terminal; the first cell frequency point information is cell frequency point information accessed when the terminal carries out voice call last time.
The step of determining that the single frequency point issuing condition is not met comprises the following steps: determining that the last voice call information of the terminal is not stored; or, the last voice call information of the terminal is stored, but the current long term evolution LTE cell is different from the LTE cell where the terminal last performs the voice call; or, the last voice call information of the terminal is stored, the current LTE cell is the same as the LTE cell where the terminal last performs the voice call, but the cell accessed by the terminal last performs the voice call is not in the list of the priority cell.
When the condition of sending the single frequency point is determined not to be met, the obtaining of the frequency point information of the priority cell comprises the following steps:
a mobile switching center (MSC, Mobile switching center) reads and analyzes a Measurement Report (MR) of 2/3G network neighboring cells configured by a current LTE cell through an A interface, judges whether the MR has a problem, adds the cell with the MR problem into a blacklist, and identifies the cell with the MR normal as a priority cell;
wherein the determining whether the MR has a problem comprises:
judging whether the part with poor call quality in the MR exceeds a preset threshold value or not, wherein the cell exceeding the preset threshold value is the cell with the problem in the MR; the call quality of the terminal is generally divided into 8 grades of 0-7, when the call quality is in the grade of 4-7, the call quality is poor, and when the call quality is in the grade of 0-3, the call quality is good; the preset threshold may be set according to actual needs, and in an embodiment, the threshold is 5%, that is, when a part of the MR in a certain cell with poor call quality exceeds 5%, it is determined that the cell is a cell in which the MR has a problem.
Instructing the base station to send the frequency point information of the priority cell to the terminal comprises the following steps: sending a fallback indication containing the frequency point information of the priority cell to the base station so that the base station sends the frequency point information of the priority cell to the terminal; here, the priority cell is a priority cell of the voice fallback.
Further, after this step, the method further comprises: recording the call information of the terminal during the voice call, specifically comprising: recording the cell number and the call quality accessed by the terminal when the terminal carries out the voice call;
here, before recording the call information of the terminal during the current voice call, the base station issues the frequency point information of the first cell or the frequency point information of the priority cell to the terminal through an RRCConnectionRelease message according to the received fallback indication, so that the terminal is accessed to a corresponding cell to perform voice service.
And after the voice service is finished, the terminal returns to the LTE network through technologies such as fast return (FR, FastReturn) and the like.
FIG. 2 is a flow chart of a CSFB method according to an embodiment of the present invention; as shown in fig. 2, the CSFB method according to the embodiment of the present invention includes:
step 201: receiving ESR sent by a terminal, judging whether the last voice call information of the terminal is stored or not, and if so, executing step 202; if not, go to step 205;
here, before this step, the terminal resides in the LTE network and has a voice service requirement, and sends a CSFB request to the base station eNodeB to establish an RRC data bearer link with the LTE network.
The last voice call information of the terminal comprises: the terminal comprises the last voice call quality information of the terminal, the cell number of the access cell of the terminal which carries out the last voice call, the LTE cell information of the terminal which carries out the last voice call, and the like.
Step 202: judging that the current LTE cell is the same as the LTE cell where the terminal last carried out the voice call, and if so, executing step 203; if not, go to step 205;
here, the determining that the current long term evolution LTE cell is the same as the LTE cell where the terminal last performed the voice call includes: and judging that the current LTE cell is the same as the LTE cell in which the terminal is located when the terminal carries out the voice call last time according to the stored voice call information of the terminal last time.
Step 203: judging whether the cell accessed by the terminal when the terminal carries out the voice call last time is in the list of the priority cell, if so, executing step 204; otherwise, go to step 205;
the method specifically comprises the following steps: judging whether a cell accessed when the terminal carries out voice call last time is in a list of priority cells or not according to the stored voice call information of the terminal last time;
wherein the priority cell includes: in 2/3G network adjacent cells configured by the current LTE cell, after cells with problems of MR are removed, the rest cells with normal MR are obtained.
Step 204: sending a fallback indication containing the cell frequency point information accessed when the terminal last performs voice communication to the base station, and then executing step 206;
here, the fallback indication is used to indicate a base station to issue cell frequency point information, accessed by the terminal when the terminal last performs a voice call, to the terminal, so that the terminal directly fallback to the cell accessed when the terminal last performs the voice call, and does not perform neighbor cell frequency point measurement, thereby reducing the time delay.
Step 205: acquiring the frequency point information of a priority cell, and sending a fallback indication containing the frequency point information of the priority cell to the base station;
here, the reading and analyzing MR of the 2/3G network neighboring cell configured by the current LTE cell, determining whether the MR has a problem, adding the cell with the MR having the problem into a blacklist, and identifying the cell with the MR normal as a priority cell;
wherein the determining whether the MR has a problem comprises:
judging whether the part with poor call quality in the MR exceeds a preset threshold value or not, wherein the cell exceeding the preset threshold value is the cell with the problem in the MR; the call quality of the terminal is generally divided into 8 grades of 0-7, when the call quality is in the grade of 4-7, the call quality is poor, and when the call quality is in the grade of 0-3, the call quality is good; the preset threshold may be set according to actual needs, and in an embodiment, the threshold is 5%, that is, when a part of the MR in a certain cell with poor call quality exceeds 5%, it is determined that the cell is a cell in which the MR has a problem.
Sending a fallback indication containing the priority cell frequency point information to the base station so that the base station sends the priority cell frequency point information to the terminal, the terminal measures the frequency points, and then selects a proper cell to access according to the measurement result so as to develop voice service; because the priority cell does not contain a cell with MR problems, the success rate of the connection of the voice service by the terminal is greatly improved.
Step 206: recording the cell number and the call quality accessed by the terminal when the terminal carries out the voice call;
here, after the terminal accesses the corresponding cell according to the frequency point information issued by the base station, when the voice service is developed, the cell number and the call quality accessed by the terminal when the terminal performs the voice call this time can be recorded.
Step 207: and ending the processing flow.
Fig. 3 is a schematic diagram of a structure of a CSFB device according to an embodiment of the invention, and as shown in fig. 3, the CSFB device according to the embodiment of the invention includes: a judgment module 31 and an indication module 32; wherein,
the judging module 31 is configured to receive an extended service request ESR sent by a terminal, and judge whether the terminal meets a single frequency point issuing condition;
the indicating module 32 is configured to instruct the base station to issue the first cell frequency point information to the terminal when the single frequency point issuing condition is met; or when the single frequency point issuing condition is not met, acquiring the frequency point information of the priority cell, and instructing the base station to issue the frequency point information of the priority cell to the terminal.
Further, the single frequency point issuing condition includes: the last voice call information of the terminal is stored, the current LTE cell is the same as the LTE cell where the terminal last performs voice call, and the cell accessed when the terminal last performs voice call is in the list of the priority cell; here, the last voice call information of the terminal includes: the terminal comprises the last voice call quality information of the terminal, the cell number of the access cell of the terminal which carries out the last voice call, the LTE cell information of the terminal which carries out the last voice call, and the like.
Further, the instructing module 32 instructs the base station to issue the first cell frequency point information to the terminal includes:
the indication module 32 sends a fallback indication including the first cell frequency point information to the base station, so that the base station issues the first cell frequency point information to the terminal; the first cell frequency point information is cell frequency point information accessed when the terminal carries out voice call last time.
Further, when the instruction module 32 does not satisfy the single frequency point issuing condition, the obtaining of the frequency point information of the priority cell includes:
when the instruction module 32 does not satisfy the condition of issuing a single frequency point, the measurement report MR of the 2/3G network neighbor cell configured in the current LTE cell is read and analyzed, and whether the part with poor call quality in the MR exceeds a preset threshold value is judged, and the cell exceeding the preset threshold value is the cell with the MR problem; the call quality of the terminal is generally divided into 8 grades of 0-7, when the call quality is in the grade of 4-7, the call quality is poor, and when the call quality is in the grade of 0-3, the call quality is good; the preset threshold may be set according to actual needs, and in an embodiment, the threshold is 5%, that is, when a part of the MR in a certain cell with poor call quality exceeds 5%, it is determined that the cell is a cell in which the MR has a problem.
Further, the instructing module 32 instructs the base station to send the frequency point information of the priority cell to the terminal includes:
the indication module 32 sends a fallback indication including the frequency point information of the priority cell to the base station, so that the base station issues the frequency point information of the priority cell to the terminal; here, the priority cell is a priority cell of the voice fallback.
Further, the device further includes a recording module 33, configured to record call information of the terminal during the current voice call.
In the embodiment of the present invention, the determining module 31, the indicating module 32 and the recording module 33 may be implemented by a Central Processing Unit (CPU) or a Digital Signal Processor (DSP) or a Field Programmable Gate Array (FPGA) in a server.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A method for Circuit Switched Fallback (CSFB), the method comprising:
receiving an ESR (extended service request) sent by a terminal, and judging whether the terminal meets a single frequency point issuing condition or not;
when the condition of sending a single frequency point is determined to be met, indicating a base station to send frequency point information of a first cell to the terminal; or when the condition of sending the single frequency point is determined not to be met, obtaining the frequency point information of the priority cell, and instructing the base station to send the frequency point information of the priority cell to the terminal.
2. The method according to claim 1, wherein the single frequency point issuing condition includes: the last voice call information of the terminal is stored, the current LTE cell is the same as the LTE cell where the terminal last performs voice call, and the cell accessed when the terminal last performs voice call is in the list of the priority cell.
3. The method according to claim 1 or 2, wherein when it is determined that the single frequency point issuing condition is not satisfied, the obtaining of the frequency point information of the priority cell comprises:
and when the condition that the single frequency point issuing condition is not met is determined, reading and analyzing a measurement report MR of the 2/3G network neighboring cell configured by the current LTE cell, adding the cell with the MR problem into a blacklist, and identifying the cell with the MR normal as a priority cell.
4. The method of claim 3, wherein the MR problem cell comprises: and the MR is a cell with the part with poor call quality exceeding a preset threshold value.
5. The method according to claim 1 or 2, wherein after the instructing base station issues the frequency point information of the first cell to the terminal, or after the instructing base station issues the frequency point information of the priority cell to the terminal, the method further comprises:
and recording the call information of the terminal during the voice call.
6. An apparatus of a CSFB, wherein the apparatus comprises: a judging module and an indicating module; wherein,
the judging module is used for receiving an ESR (extended service request) sent by a terminal and judging whether the terminal meets a single frequency point issuing condition;
the indication module is used for indicating the base station to issue the frequency point information of the first cell to the terminal when the single frequency point issuing condition is met; or when the single frequency point issuing condition is not met, acquiring the frequency point information of the priority cell, and instructing the base station to issue the frequency point information of the priority cell to the terminal.
7. The apparatus of claim 6, wherein the single frequency point issuing condition comprises: the last voice call information of the terminal is stored, the current LTE cell is the same as the LTE cell where the terminal last performs voice call, and the cell accessed when the terminal last performs voice call is in the list of the priority cell.
8. The apparatus according to claim 6 or 7, wherein the indicating module is specifically configured to, when the condition for issuing a single frequency point is not satisfied, read and analyze a measurement report MR of an 2/3G network neighboring cell configured by a current LTE cell, add a cell with a problem in the MR to a blacklist, and identify a cell with a normal MR as a priority cell.
9. The apparatus of claim 8, wherein the MR problem cell comprises: and the MR is a cell with the part with poor call quality exceeding a preset threshold value.
10. The device according to claim 6 or 7, wherein the device further comprises a recording module, configured to record call information when the terminal performs the voice call this time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510003001.6A CN105828392B (en) | 2015-01-04 | 2015-01-04 | A kind of method and device of circuit domain dropping |
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| CN201510003001.6A CN105828392B (en) | 2015-01-04 | 2015-01-04 | A kind of method and device of circuit domain dropping |
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| CN106454968A (en) * | 2016-09-08 | 2017-02-22 | 广东欧珀移动通信有限公司 | CSFB-based calling method and apparatus |
| CN107493592A (en) * | 2017-08-10 | 2017-12-19 | 广东欧珀移动通信有限公司 | Method of calling and Related product |
| CN107517490A (en) * | 2017-08-10 | 2017-12-26 | 广东欧珀移动通信有限公司 | Calling implementation method and Related product |
| CN107959952A (en) * | 2017-12-21 | 2018-04-24 | 维沃移动通信有限公司 | A kind of detection method and terminal of different system cell |
| CN110049524A (en) * | 2019-05-09 | 2019-07-23 | 中国联合网络通信集团有限公司 | Mobile terminal and its method for falling cell after rise |
| CN110063071A (en) * | 2017-10-13 | 2019-07-26 | 华为技术有限公司 | A kind of method and terminal of cell selection |
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| CN105828392B (en) | 2019-04-19 |
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