CN106993314B - Fallback performance judgment method and device for circuit switched fallback - Google Patents

Abstract

The invention discloses a fallback performance judgment method of Circuit Switched Fallback (CSFB), which comprises the following steps: screening out a first cell list and a second cell list according to the information association table; arranging 4G-2G cell pairs which are successfully subjected to CSFB according to the first cell list and the second cell list, and calculating the distance between the 4G-2G cell pairs; and judging whether the distance of the 4G-2G cell pair under different wireless coverage scenes exceeds a preset corresponding threshold value or not, and judging that the CSFB falls back unreasonably when the distance exceeds the preset corresponding threshold value. The invention also discloses a CSFB fallback performance judgment device.

Description

Fallback performance judgment method and device for circuit switched fallback

Technical Field

The present invention relates to a Fallback performance management technology, and in particular, to a Fallback performance determining method and apparatus for Circuit Switched Fallback (CSFB).

Background

Currently, a voice service solution supported by a Time Division Long Term Evolution (TD-LTE) system includes: CSFB and single card dual standby. The single-card dual-standby mode provides voice service by directly utilizing a 2G/3G network, and when the CSFB mode is that a terminal initiates the voice service, an evolved packet core network System (EPS) network indicates the terminal to fall back to the 2G/3G network from the LTE network, and then the voice call connection is initiated in the 2G/3G network.

The CSFB call setup procedure includes three phases: user Equipment (UE) initiates a call (calling MO) or receives a page (called MT) in an LTE network, the UE falls back under the indication of the LTE network, and the UE falls back to a 2G/3G network to establish a voice call. From the CSFB service flow, the fallback performance of the CSFB directly affects the call completing rate of the CSFB, and the fallback performance is directly reflected on the usage perception of the user. At present, the only CSFB MT fallback success rate is the CSFB performance index. However, from the case of live-net field test, the CSFB MT fallback success rate indicator loses the judgment ability for the following two cases:

1) under 4G indoor division, the CSFB terminal cannot fall back to the strongest indoor division-2G cell, but fall back to an outdoor macro base station cell, where a part of the fallen cells are more 2G cells of a Location Area Code (LAC), and are far away. The method may cause the problems of high noise and poor call quality in the call process, but from the index, the call is connected, the CSFB fallback succeeds, but the call perception of the finally connected voice service is poor due to the unreasonable fallback 2G cell.

2) In an outdoor environment, a CSFB terminal cannot fall back to a closer 2G cell. Due to the too long fall back distance, the base station is covered by the zone, the communication quality of the occupied channel is poor, RxQ grades are 6 and 7, and finally no service channel is established in the 2G network, so that the call is not connected.

By searching patents related to CSFB, it was found that: basically describing the function implementation of the voice fallback technology, wherein patent 201110123231.8 discloses a method and a system for improving the voice fallback efficiency and the success rate, which mainly ensure the timeliness and the success rate of the voice service; patent 201180044049.1 discloses a system and method for improving the circuit switched fallback user experience, primarily for providing users with a technique for indicating failed calls. And for a reasonable judgment method after the CSFB falls back successfully, no relevant patent is found at present. Therefore, how to decide whether the CSFB falls back to a reasonable 2G/3G cell is an urgent problem to be solved, and is of great significance to the development of wireless communication technology.

Disclosure of Invention

In view of this, embodiments of the present invention are expected to provide a method and an apparatus for determining a fallback performance of a CSFB, which can quickly and effectively determine whether the fallback of the CSFB is reasonable, so as to ensure voice call quality and improve user perception after a voice service fallback succeeds.

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 fallback performance judging method, which comprises the following steps:

screening out a first cell list and a second cell list according to the information association table;

arranging 4G-2G cell pairs which are successfully subjected to CSFB according to the first cell list and the second cell list, and calculating the distance between the 4G-2G cell pairs;

and judging whether the distance of the 4G-2G cell pair under different wireless coverage scenes exceeds a preset corresponding threshold value or not, and judging that the CSFB falls back unreasonably when the distance exceeds the preset corresponding threshold value.

In the foregoing solution, before the screening out the first cell list and the second cell list, the method further includes: interface signaling data is collected and associated through International Mobile Subscriber Identity (IMSI) information to generate an information association table.

In the above solution, the interface includes: SGs, S1-MME, Mc interface; the wireless coverage scenario includes: indoor scenes, suburban scenes and urban scenes.

In the foregoing solution, the first cell list includes: finding out a 4G cell list of CSFB fallback failure according to all records of CSFB fallback failure; the second cell list includes: the CSFB successfully falls back to the cell list of the 2G network.

In the foregoing solution, when the first cell list and the second cell list are screened out, the method further includes:

screening out key signaling in the CSFB establishment process;

judging whether the fallback of the CSFB is reasonable or not according to the key signaling;

wherein the critical signaling comprises: tracking area update signaling, traffic channel allocation failure signaling, authentication failure signaling.

An embodiment of the present invention further provides a device for determining a fallback performance of a CSFB, where the device includes:

the screening module is used for screening the first cell list and the second cell list according to the information association table;

a calculating module, configured to arrange the 4G-2G cell pairs that are successful in CSFB fallback according to the first cell list and the second cell list, and calculate a distance between the 4G-2G cell pairs;

and the judging module is used for judging whether the distance of the 4G-2G cell pair under different wireless coverage scenes exceeds a preset corresponding threshold value or not, and judging that the CSFB falls back unreasonably when the distance exceeds the preset corresponding threshold value.

In the above scheme, the apparatus further comprises: and the acquisition module is used for acquiring interface signaling data before the screening module screens the first cell list and the second cell list, and performing correlation through IMSI information to generate an information correlation table.

In the above solution, the interface includes: SGs, S1-MME, Mc interface; the wireless coverage scenario includes: indoor scenes, suburban scenes and urban scenes.

In the foregoing solution, the first cell list includes: finding out a 4G cell list of CSFB fallback failure according to all records of CSFB fallback failure; the second cell list includes: the CSFB successfully falls back to the cell list of the 2G network.

In the above scheme, the screening module is further configured to screen a key signaling in the CSFB establishment process when the first cell list and the second cell list are screened;

the judging module is further configured to judge whether fallback of the CSFB is reasonable according to the key signaling;

wherein the critical signaling comprises: tracking area update signaling, traffic channel allocation failure signaling, authentication failure signaling.

The method and the device for judging the fallback performance of the CSFB provided by the embodiment of the invention screen out the first cell list and the second cell list according to the information association table, arrange the 4G-2G cell pairs which are successful in the fallback of the CSFB according to the first cell list and the second cell list, calculate the distance of the 4G-2G cell pairs, judge whether the distance of the 4G-2G cell pairs under different wireless coverage scenes exceeds a preset corresponding threshold value or not, and judge that the fallback of the CSFB is unreasonable when the distance exceeds the preset corresponding threshold value. Therefore, whether the CSFB fallback is reasonable or not can be judged quickly and effectively, so that the voice call quality is ensured after the voice service fallback is successful, and the use perception of a user is improved. In addition, the unreasonable fall-back situation of the CSFB can be classified, corresponding solutions or schemes are respectively provided, and the problems that the voice service is not connected or the call quality is poor due to the unreasonable fall-back situation of the CSFB are prevented.

Drawings

Fig. 1 is a schematic flow chart illustrating an implementation process of a fallback performance decision method of a CSFB according to an embodiment of the present invention;

fig. 2 is a schematic diagram of network elements and interfaces involved in a fall back process of a CSFB according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an implementation flow of a fallback rationality method for deciding CSFB by using a critical signaling of CSFB fallback failure and connection failure in the embodiment of the present invention;

fig. 4 is a schematic flow chart illustrating an implementation of a fallback rationality method for deciding CSFB according to distance in different scenarios according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a fall-back performance determining apparatus of a CSFB according to an embodiment of the present invention.

Detailed Description

So that the manner in which the features and aspects of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.

It should be noted that the success of fallback in the optimization process of the CSFB in the embodiment of the present invention mainly refers to fallback from the 4G network to the 2G network, which is a policy specified by a mobile operator, and because the coverage of the 2G network is wider; if the 4G network falls back to the 3G network, the 4G network first falls back to the 2G network, and after the fall back fails, the 4G network falls back to the 3G network, so that although the fall back may be successful, the network connection delay may be extended, which affects the experience perception of the user.

As shown in fig. 1, an implementation procedure of a method for deciding fallback performance of CSFB in the embodiment of the present invention includes the following steps:

step 101: screening out a first cell list and a second cell list according to the information association table;

here, before the screening out the first cell list and the second cell list, the method further includes: and acquiring interface signaling data, and associating through IMSI information to generate an information association table. The IMSI is a mark for distinguishing the mobile subscriber, is stored in the SIM card and can be used for distinguishing effective information of the mobile subscriber.

Wherein the first cell list comprises: finding out a 4G cell list of CSFB fallback failure according to all records of CSFB fallback failure; the second cell list includes: the CSFB successfully falls back to the cell list of the 2G network.

Here, how to specifically screen the first cell list and the second cell list belongs to the prior art, and details are not described here. Here, the interface includes: SGs, S1-MME, Mc interface; wherein, a schematic diagram of network elements and interfaces involved in a fallback procedure of the CSFB is shown in fig. 2.

The SGs interface is an interface between a Mobile Switching center Server (MSC Server) and a Mobility Management Entity (MME), and is used to process Mobility Management (MM) and paging procedures between an EPS and a Circuit Switching (CS) domain, and these procedures are implemented by extending based on the existing Gs interface; and the SGs interface is the most important interface in the CSFB technology, and is used to transfer relevant information of the CSFB, i.e., Short Message Service (SMS) for transmitting MO and MT;

s1 — MME interface is an interface between MME and evolved base station (eNB, eNodeB) for transferring Session Management (SM) and MM information, i.e. signaling plane or control plane information;

the Mc interface is an interface between the MSC Server and a Media Gateway (MGW), wherein the MSCServer controls and monitors bearer connection behavior of the MGW through the Mc interface, and the Mc interface may be based on Asynchronous Transfer Mode (ATM) or Internet Protocol (IP) bearer.

After the signaling data acquisition of the SGs, the S1-MME and the Mc interface is completed and the correlation is successful through the IMSI information of the user, a sample collection table of the signaling data acquisition of the SGs, the S1-MME and the Mc interface is generated, as shown in Table 1. The 4G cell information and the 2G cell information after the CSFB fallback success can be obtained through table 1, and further, the 4G-2G cell pair list for the CSFB fallback success can be obtained.

Here, the cell information includes a cell number, where the cell number of the 4G network is denoted by ECI and the cell number of the 2G network is denoted by CI. And forming a 4G and 2G cell pair according to the successful fall back of the 4G network to the 2G network and the corresponding relation of the cell numbers of the 4G cell and the 2G cell.

TABLE 1

Here, in the screening out the first cell list and the second cell list, the method further includes:

screening out key signaling in the CSFB establishment process;

and judging whether the fallback of the CSFB is reasonable or not according to the key signaling.

Wherein the critical signaling comprises: tracking Area update (Tracking Area update) signaling, Traffic Channel Assignment failure (Traffic Channel Assignment failure) signaling, and authentication failure signaling.

Here, how to filter the critical signaling belongs to the prior art, such as: the screening process can be realized by an LTE signaling instrument, and key signaling is read from the signaling record according to time, and the detailed process is not repeated herein.

The method for determining the reasonability of the CSFB fallback in the embodiment of the present invention is further described in detail below with reference to fig. 3:

as shown in fig. 3, an implementation procedure of a fallback rationality method for deciding CSFB by using a critical signaling of CSFB fallback failure and connection failure in the embodiment of the present invention includes the following steps:

step 301: counting the fall-back times and the connection times of the 4G-2G fall-back cell pairs in unit time, and arranging a 4G cell list with more CSFB fall-back failure times in a descending order;

here, the number of fallback and the number of turn-on times of the 4G-2G fallback cell pair per unit time can be counted from the cell data pivot table in the CSFB fallback procedure.

Step 302: judging whether to connect the failed 4G cell after the fallback, if not, executing a step 103; if yes, go to step 303;

step 303: judging whether the cell falls back to the 3G cell, if not, executing a step 304; if yes, go to step 306;

here, because CSFB falls back to the 2G network in the current CSFB planning of the TD-LTE network, if the CSFB falls back to the 3G network, the end-to-end connection delay is long, which can generally reach 32 seconds, and therefore, the connection rate is low, and can only reach about 30%.

Step 304: screening call records of which CSFB fallback succeeds but TCH establishment fails, and correspondingly classifying the call records according to reasons of establishment failure;

step 305: screening out key signaling such as Tracking area update, TCH Assignment Fail, authentication failure and the like in the process of successful CSFB fallback but failed establishment, if the key signaling is found, calculating to obtain a 4G-2G fallback successful but failed 4G cell through communication records, and executing step 306;

step 306: it is decided to be a CSFB fallback irrational cell.

Step 102: arranging 4G-2G cell pairs which are successfully subjected to CSFB according to the first cell list and the second cell list, and calculating the distance between the 4G-2G cell pairs;

here, the distance of the 4G and 2G cell pair in which the fallback is successful may be calculated according to the longitude and latitude information of the 4G and 2G cells.

On the basis of table 1, other relevant information is supplemented, and a 4G-2G cell matching table for arranging CSFB fallback success is generated, as shown in table 2, start time, CDR identifier, 4G ECI, ENB ID, 4G TAC, source IP address, destination IP address, mobile phone manufacturer, S1AP TMSI, IMSI, IMEI, fallback LAC, fallback CI, mobile phone number, and the like.

TABLE 2

Here, through the 4G ECI information in table 2, the coverage type of the 4G cell can be determined, i.e. the 4G cell can be divided into: 4G room sub-cells and 4G macro cell. Similarly, the corresponding 2G cell can be divided into a 2G room sub-cell and a 2G macro station cell.

Step 103: and judging whether the distance of the 4G-2G cell pair under different wireless coverage scenes exceeds a preset corresponding threshold value or not, and judging that the CSFB falls back unreasonably when the distance exceeds the preset corresponding threshold value.

Wherein the wireless coverage scenario comprises: indoor scenes, suburban scenes and urban scenes.

Here, the above step 103 is described in detail with reference to fig. 4:

as shown in fig. 4, an implementation process of a fallback rationality method for deciding CSFB by distance under different scenarios in the embodiment of the present invention includes the following steps:

step 400: 4G-2G cell pairs which are successfully fallen back from the whole network are sorted out;

step 401: judging whether the 4G cell is a room sub-cell or not according to the sorted 4G-2G cell pair, and if so, executing 402; if not, 403 is executed;

step 402: judging whether the distance of the 4G-2G cell pair exceeds 1km, if so, executing a step 406, and if not, executing a step 407;

step 403: judging whether the 4G cell is a suburban cell or not, if so, executing 404; if not, then 405 is performed;

step 404: judging whether the distance of the 4G-2G cell pair exceeds 5km, if so, executing a step 406, and if not, executing a step 407;

step 405: if the 4G cell is not the indoor sub-cell and the suburban cell, judging whether the distance of the 4G-2G cell pair exceeds 2km, if so, executing a step 406, and if not, executing a step 407;

step 406: judging the 4G-2G cell pair as a CSFB fallback unreasonable cell pair;

here, when the 4G-2G cell pair is judged to be a CSFB fallback unreasonable cell pair, the 2G frequency point configured by the 4G cell is deleted, and if the CSFB call service proportion of the 4G cell occupied by a certain 4G-2G cell pair exceeds a preset threshold value, important attention needs to be paid and optimization is performed.

Step 407: and judging the 4G-2G cell pair as a CSFB fallback reasonable cell pair.

In order to implement the foregoing method, an embodiment of the present invention further provides a device for determining a fallback performance of a CSFB, where as shown in fig. 5, the device includes a screening module 51, a calculating module 52, and a determining module 53; wherein the content of the first and second substances,

a screening module 51, configured to screen the first cell list and the second cell list according to the information association table;

a calculating module 52, configured to arrange the 4G-2G cell pairs that are successful in CSFB fallback according to the first cell list and the second cell list, and calculate a distance between the 4G-2G cell pairs;

and the judging module 53 is configured to judge whether the distance between the 4G-2G cell pair in different wireless coverage scenarios exceeds a preset corresponding threshold, and when the distance exceeds the preset corresponding threshold, judge that the CSFB falls back unreasonably.

Wherein the apparatus further comprises: an obtaining module 54, configured to collect interface signaling data before the screening module 51 screens the first cell list and the second cell list, and perform association through IMSI information to generate an information association table.

Further, the screening module 51 is further configured to screen a key signaling in the CSFB establishing process when the first cell list and the second cell list are screened;

the decision module 53 is further configured to decide whether the fallback of the CSFB is reasonable according to the key signaling.

Here, the first cell list includes: finding out a 4G cell list of CSFB fallback failure according to all records of CSFB fallback failure; the second cell list includes: the CSFB successfully falls back to the cell list of the 2G network.

The interface includes: SGs, S1-MME, Mc interface; the wireless coverage scenario includes: indoor scenes, suburban scenes and urban scenes; the critical signaling includes: tracking area update signaling, traffic channel allocation failure signaling, authentication failure signaling.

In practical applications, the screening module 51, the calculating module 52, the judging module 53, and the obtaining module 54 may be implemented by a Central Processing Unit (CPU), a Micro Processing Unit (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like located on a mobile terminal of a wireless communication network.

According to the embodiment of the invention, a first cell list and a second cell list are screened out according to an information association table, 4G-2G cell pairs which are successfully subjected to CSFB fallback are arranged according to the first cell list and the second cell list, the distance of the 4G-2G cell pairs is calculated, whether the distance of the 4G-2G cell pairs under different wireless coverage scenes exceeds a preset corresponding threshold value or not is judged, and when the distance exceeds the preset corresponding threshold value, the CSFB fallback is judged to be unreasonable. Therefore, whether the CSFB fallback is reasonable or not can be judged quickly and effectively, so that the voice call quality is ensured after the voice service fallback is successful, and the use perception of a user is improved. In addition, the unreasonable fall-back situation of the CSFB can be classified, corresponding solutions or schemes are respectively provided, and the problems that the voice service is not connected or the call quality is poor due to the unreasonable fall-back situation of the CSFB are prevented.

The method and the device for judging the fallback performance of the CSFB in the embodiment of the present invention may be deployed and implemented according to a mobile communication network with a coexisting 2G/3G/4G network, and although the LTE communication system is only taken as an example, the method and the device in the embodiment of the present invention are not limited thereto, and the method and the device in the embodiment of the present invention may also be applied to other communication systems with similar signaling.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.

Claims (6)

1. A fallback performance decision method for Circuit Switched Fallback (CSFB), the method comprising:

screening out a first cell list and a second cell list according to the information association table;

arranging 4G-2G cell pairs which are successfully subjected to CSFB according to the first cell list and the second cell list, and calculating the distance between the 4G-2G cell pairs;

judging whether the distance of the 4G-2G cell pair under different wireless coverage scenes exceeds a preset corresponding threshold value or not, and judging that the CSFB falls back unreasonably when the distance exceeds the preset corresponding threshold value;

the information association list is generated by acquiring interface signaling data and associating the interface signaling data through International Mobile Subscriber Identity (IMSI) information;

the first cell list comprises a 4G cell list for finding out CSFB fallback failure through all records of the CSFB fallback failure;

the second cell list includes a list of cells for which the CSFB successfully falls back to the 2G network.

2. The method of claim 1, wherein the interface comprises: SGs, S1-MME, Mc interface; the wireless coverage scenario includes: indoor scenes, suburban scenes and urban scenes.

3. The method of claim 1, wherein in the screening out the first cell list and the second cell list, the method further comprises:

screening out key signaling in the CSFB establishment process;

judging whether the fallback of the CSFB is reasonable or not according to the key signaling;

wherein the critical signaling comprises: tracking area update signaling, traffic channel allocation failure signaling, authentication failure signaling.

4. An apparatus for deciding fallback performance of a circuit switched fallback CSFB, the apparatus comprising:

the screening module is used for screening the first cell list and the second cell list according to the information association table;

a calculating module, configured to arrange the 4G-2G cell pairs that are successful in CSFB fallback according to the first cell list and the second cell list, and calculate a distance between the 4G-2G cell pairs;

the judging module is used for judging whether the distance of the 4G-2G cell pair under different wireless coverage scenes exceeds a preset corresponding threshold value or not, and judging that the CSFB falls back unreasonably when the distance exceeds the preset corresponding threshold value;

the device also comprises an acquisition module, a selection module and a processing module, wherein the acquisition module is used for acquiring interface signaling data before the screening module screens the first cell list and the second cell list, and associating the interface signaling data through International Mobile Subscriber Identity (IMSI) information to generate an information association table;

wherein the first cell list comprises: finding out a 4G cell list of CSFB fallback failure according to all records of CSFB fallback failure; the second cell list includes: the CSFB successfully falls back to the cell list of the 2G network.

5. The apparatus of claim 4, wherein the interface comprises: SGs, S1-MME, Mc interface; the wireless coverage scenario includes: indoor scenes, suburban scenes and urban scenes.

6. The apparatus of claim 4, wherein the screening module is further configured to screen a critical signaling in a CSFB establishment procedure when the first cell list and the second cell list are screened;

the judging module is further configured to judge whether fallback of the CSFB is reasonable according to the key signaling;

wherein the critical signaling comprises: tracking area update signaling, traffic channel allocation failure signaling, authentication failure signaling.

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