CN110381552B - Method and system for optimizing fallback based on position - Google Patents
Method and system for optimizing fallback based on position Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
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- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
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Abstract
The invention provides a method for optimizing fallback based on positions, which comprises the following steps: the eNB establishes an association table of TAI information, fallback cell frequency point information and position information; during communication, the MME sends a terminal drop cell indication to the eNB and carries the current position information of the terminal; the eNB receives the current position information of the terminal, measures the distance between the current position of the terminal and each corresponding position of each relevant cell in the association table, and sends the cell frequency point information to the terminal when a certain measured distance is smaller than a preset threshold value, and instructs the terminal to fall back according to the cell frequency point; and receiving TAI information, fallback cell frequency point information and position information when the terminal falls back, which are returned to the LTE network, so as to enrich the association table. The invention also provides a corresponding system. The method and the system for optimizing the fallback based on the position can enable the mobile terminal to rapidly fallback to a proper cell, save the measurement steps of the fallback cell, do not need to update the position after the fallback, reduce the service time and effectively ensure the service quality.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method and a system for optimizing fallback based on positions.
Background
An LTE (Long Term Evolution ) network designed based on packet domain full IP cannot bear traditional circuit domain Voice services, and a target scheme for bearing Voice is a Voice Over LTE (Voice Over LTE) scheme based on IMS (IP Multimedia Subsystem) to bear VoIP services (Voice Over Internet Protocol, Voice transmission based on IP, i.e., network telephony). However, before the VoLTE industry is mature and the LTE network is conditioned, the 2G/3G network still needs to be used to carry voice, that is, the 2G/3G network is directly utilized to provide voice service by adopting a CSFB (Circuit Switched Fallback) scheme. The basic idea of the CSFB (Circuit Switched Fallback) scheme is that when a mobile terminal resides in an idle state or a data service connection state of an LTE network, when there is a voice service requirement (a calling party or a called party), the mobile terminal falls back to a 2G/3G network to establish a voice service by the aid of the LTE network, and returns to the LTE network after the call is completed.
Typical CSFB service flows mainly include a joint attachment, a location update, a calling (MO) CSFB flow, a called (MT) CSFB flow, and a detach. Currently, in the CSFB call implementation procedure, when there is an incoming call to a Mobile terminal, an MSC (Mobile Switching center) sends a paging request to the Mobile terminal through an MME (Mobility Management Entity), the Mobile terminal sends an extended service request to the MME after receiving the paging request sent by the MME, the MME sends a Mobile terminal drop cell indication to an eNB (evolved Node B) after receiving the extended service request, and sends configured drop cell information to the Mobile terminal, the Mobile terminal performs drop cell measurement, sends a measurement result to the eNB, the eNB determines an appropriate drop cell and then sends the information to the Mobile terminal, the Mobile terminal drops back to the appropriate cell, if the dropped cell is not consistent with a cell identifier during joint attachment, the Mobile terminal performs location update first, and after the location update is completed, the Mobile terminal sends a paging response message to the MSC, and establishing a call. The whole call establishment process needs location updating, so that the time is long and the user perception is poor.
Disclosure of Invention
The present invention is accomplished to at least partially solve the technical problems of the prior art that the mobile terminal needs to perform location update during the call process and the whole call setup time is long.
The technical scheme adopted for solving the technical problem of the invention is as follows:
the invention provides a method for optimizing fallback based on positions, which comprises the following steps:
the eNB establishes an association table of TAI (Tracking Area Identity) information, fallback cell frequency point information and position information of the mobile terminal;
when the mobile terminal establishes a call, the MME sends a mobile terminal drop cell indication to the eNB and carries the current position information of the mobile terminal;
the eNB receives the current position information of the mobile terminal, measures the distance between the current position of the mobile terminal and each corresponding position of each relevant cell in the association table, and when the measured distance between the mobile terminal and a certain position of one relevant cell in the association table is smaller than a preset threshold value, the eNB sends the cell frequency point information to the mobile terminal and indicates the mobile terminal to directly fall back according to the cell frequency point;
and the eNB receives the TAI information, the fallback cell frequency point information and the position information of the mobile terminal returned to the LTE network by the mobile terminal according to the indicated cell frequency point fallback, and supplements the TAI information, the fallback cell frequency point information and the position information of the mobile terminal in the fallback state into the association table.
Further, the eNB instructing the mobile terminal to directly fall back according to the cell frequency point includes:
the eNB receives TAI information, fallback cell frequency point information and position information of the mobile terminal when the mobile terminal falls back, stores the TAI information, the fallback cell frequency point information and the position information of the mobile terminal when the mobile terminal falls back into the association table, and forms a position range of a certain cell when the number of the fallen position information corresponding to the certain cell in the association table is enough;
when the mobile terminal establishes a call, the eNB determines the position range of the corresponding cell in which the mobile terminal falls according to the current position information of the mobile terminal and the position range information of the corresponding cell in the association table;
and the eNB extracts the fallback cell frequency point information corresponding to the position range of the corresponding cell in which the mobile terminal falls, sends the fallback cell frequency point information to the mobile terminal, and indicates the mobile terminal to directly fall back according to the cell frequency point.
Further, the method for optimizing fallback based on location further comprises:
when the eNB measures that the distances between the mobile terminal and all corresponding positions of all relevant cells in the association table are not smaller than a preset threshold value, the eNB instructs the mobile terminal to receive the configured frequency point information of the fallback cells and measure the signal intensity of the fallback cells, the eNB receives the measurement result sent by the mobile terminal, determines a proper fallback cell according to the measurement result, and then sends the frequency point information of the proper fallback cell to the mobile terminal;
the mobile terminal receives the frequency point information of the suitable drop cell and drops the frequency point information to the suitable cell, and if the dropped cell is inconsistent with the cell identifier in the combined attachment, the mobile terminal updates the position;
and when the mobile terminal finishes the call and returns to the LTE network, sending the TAI information, the fallback cell frequency point information and the position information of the mobile terminal when the mobile terminal falls back to the eNB so as to supplement the association table.
Further, before the MME sends the mobile terminal drop-back cell indication to the eNB, the method further includes:
the MME sends a paging request to the mobile terminal;
the mobile terminal receives a paging request sent by the MME and sends an extended service request to the MME, wherein the extended service request comprises the current position information of the mobile terminal.
According to another aspect of the present invention, there is also provided a system for optimizing fallback based on location, comprising: eNB, MME and mobile terminal;
the eNB is used for establishing an association table of TAI information, fallback cell frequency point information and position information of the mobile terminal;
the MME is used for sending a mobile terminal falling cell indication to the eNB when the mobile terminal establishes a call, and carrying the current position information of the mobile terminal;
the eNB is also used for receiving the current position information of the mobile terminal, measuring the distance between the current position of the mobile terminal and each corresponding position of each relevant cell in the association table, and when the measured distance between the mobile terminal and a certain position of one relevant cell in the association table is smaller than a preset threshold value, sending the cell frequency point information to the mobile terminal and indicating the mobile terminal to directly fall back according to the cell frequency point; and the number of the first and second groups,
and receiving TAI information, fallback cell frequency point information and position information of the mobile terminal returned to the LTE network by the mobile terminal according to the indicated cell frequency point fallback, and supplementing the TAI information, the fallback cell frequency point information and the position information of the mobile terminal when the mobile terminal is fallback into the association table.
Further, the eNB is configured to instruct the mobile terminal to directly fall back according to the cell frequency point, and specifically includes:
the eNB receives TAI information, fallback cell frequency point information and position information of the mobile terminal when the mobile terminal falls back, stores the TAI information, the fallback cell frequency point information and the position information of the mobile terminal when the mobile terminal falls back into the association table, and forms a position range of a certain cell when the number of the fallen position information corresponding to the certain cell in the association table is enough; and the number of the first and second groups,
when the mobile terminal establishes a call, the eNB determines the position range of the corresponding cell in which the mobile terminal falls according to the current position information of the mobile terminal and the position range information of the corresponding cell in the association table;
and the eNB extracts the fallback cell frequency point information corresponding to the position range of the corresponding cell in which the mobile terminal falls, sends the fallback cell frequency point information to the mobile terminal, and indicates the mobile terminal to directly fall back according to the cell frequency point.
Further, the eNB is further configured to:
when the eNB measures that the distances between the mobile terminal and all corresponding positions of all relevant cells in the association table are not smaller than a preset threshold value, the mobile terminal is instructed to receive the configured frequency point information of the fallback cells and measure the signal intensity of the fallback cells, the measurement results sent by the mobile terminal are received, the appropriate fallback cells are determined according to the measurement results, and then the frequency point information of the appropriate fallback cells is sent to the mobile terminal;
the mobile terminal is used for receiving the frequency point information of the suitable fallback cell and fallback to the suitable cell, and if the fallback cell is not consistent with the cell identifier in the joint attachment, the mobile terminal updates the position; and the number of the first and second groups,
when the mobile terminal finishes the call and returns to the LTE network, the mobile terminal is also used for sending the TAI information, the fallback cell frequency point information and the position information of the mobile terminal when the mobile terminal falls back to the eNB so as to supplement the association table.
Further, before the MME sends the mobile terminal drop cell indication to the eNB, the mobile terminal is further configured to:
and receiving a paging request sent by the MME, and sending an extended service request to the MME, wherein the extended service request comprises the current position information of the mobile terminal.
Has the advantages that:
the invention relates to a method and a system for optimizing fallback based on position, wherein an eNB establishes an association table of TAI information, fallback cell frequency points and position information, after a CSFB call is successfully established, a mobile terminal sends related information to the eNB to be filled in the table, when the position information corresponding to a cell in the eNB association table is enough, a position range of the cell is formed, and after the mobile terminal receives a paging request, the eNB judges that the position of the mobile terminal falls into the position range of the corresponding cell and indicates the mobile terminal to directly fall back.
Drawings
Fig. 1 is a flowchart of a method for optimizing fallback based on location according to a first embodiment of the present invention;
fig. 2 is an architecture diagram of a system for optimizing fallback based on location according to a second embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail below with reference to the accompanying drawings and examples.
Example one
As shown in fig. 1, the present invention provides a method for optimizing fallback based on location, comprising:
step S1: the eNB establishes an association table of TAI information, fallback cell frequency point information and position information of the mobile terminal;
step S2: when the mobile terminal establishes a call, the MME sends a mobile terminal drop cell indication to the eNB and carries the current position information of the mobile terminal;
step S3: the eNB receives the current position information of the mobile terminal, measures the distance between the current position of the mobile terminal and each corresponding position of each relevant cell in the association table, and when the measured distance between the mobile terminal and a certain position of one relevant cell in the association table is smaller than a preset threshold value, the eNB sends the cell frequency point information to the mobile terminal and indicates the mobile terminal to directly fall back according to the cell frequency point;
step S4: and the eNB receives the TAI information, the fallback cell frequency point information and the position information of the mobile terminal returned to the LTE network by the mobile terminal according to the indicated cell frequency point fallback, and supplements the TAI information, the fallback cell frequency point information and the position information of the mobile terminal in the fallback state into the association table.
The CSFB service flow mainly includes a joint attachment, a location update, a calling (MO) CSFB flow, a called (MT) CSFB flow, and a detach. The attach procedure of the user enabling the CSFB function is implemented based on a joint GPRS (General Packet Radio Service)/IMSI (International Mobile Subscriber Identity) attach procedure.
The mobile terminal carries the indication of supporting the CSFB capability in an attach request message sent to the MME. After receiving a joint attach request of a user, the MME derives VLR (Visited Location Register) information of a CS (Circuit Switched) domain related to the MME while performing EPS (Evolved Packet System) attachment, and initiates a Location update request to the VLR, and after receiving the Location update request, the VLR marks the user as having performed EPS attachment and stores an IP address of the MME of the user, so that an sgservice (Serving General Packet Radio Service) association between the VLR of the user and the MME is created in the VLR. Then, the MSC Server/VLR will perform the CS domain Location update and transmit the TMSI (Temporary Mobile Subscriber identity) and LAI (Location Area identity) of the user to the MME, thereby establishing the SGs association in the MME. Finally, the MME includes the TMSI, LAI, and other information allocated to the User by the VLR in an attach request accept message and sends the attach request accept message to the UE (User Equipment), which indicates that the User has successfully combined attachment. After the joint attachment is successful, the user with the CSFB capability can process the circuit domain service in the LTE network.
After an eNB establishes an association table of TAI information, a fallback cell frequency point and position information of a mobile terminal, when the mobile terminal A is started, a joint attachment process of a 4G multi-mode card is started, the 4G multi-mode card sends a joint attachment message to an MME, the MME sends a position update request to the MSC, VLR sends a 4G multi-mode card position update process to an HLR, after the joint attachment process is completed, when the mobile terminal A has an incoming call, the MSC sends a paging request to the MME, the MME sends a paging request to the mobile terminal A, the mobile terminal A receives the paging request sent by the MME and stores current position information and TAI information, then the mobile terminal A sends an expansion service request to the MME, the MME sends a fallback cell indication of the mobile terminal A to the eNB, the eNB sends the configured fallback cell information to the mobile terminal A, the mobile terminal A carries out fallback cell measurement, the measurement result is sent to the eNB, the eNB determines a proper fallback cell and then sends the information to the mobile terminal A, the mobile terminal A falls back to a proper cell, if the fallen cell is inconsistent with the cell identifier in the combined attachment, the mobile terminal A firstly carries out location updating, and after the location updating is finished, the mobile terminal A sends paging response information to the MSC to establish a call.
After the call is finished, the mobile terminal A stores the frequency point information of the fallback cell, the mobile terminal A returns to the LTE network and then sends the TAI information, the frequency point information of the fallback cell and the position information to the eNB, the eNB fills the association table and passes through the mobile terminals A1、A2、A3......AnAfter returning and filling the association table, obtaining a series of fallback positions a corresponding to the frequency point information of each cell1、a2、a3......anWhen the mobile terminal B has an incoming call, the mobile terminal B receives a paging request sent by the MME, the MME sends a mobile terminal falling cell indication to the eNB, the indication carries the current position information of the mobile terminal B, the eNB measures and calculates the distance between the eNB and the eNB according to the current position information of the mobile terminal B and the corresponding position information of the corresponding cell in the association table, and when the distance a is measured to one position aiWhen the distance is smaller than a preset threshold value, the eNB extracts a fallback cell frequency point corresponding to the position information and sends the fallback cell frequency point to the mobile terminal B, the mobile terminal B is instructed to directly fall back according to the fallback cell frequency point, and the mobile terminal B directly falls back to establish a call; and after returning to the LTE network, the mobile terminal B sends the TAI information, the frequency point information of the fallback cell and the position information to the eNB and supplements the information into the association table.
Further, the eNB instructing the mobile terminal to directly fall back according to the cell frequency point includes:
the eNB receives TAI information, fallback cell frequency point information and position information of the mobile terminal when the mobile terminal falls back, stores the TAI information, the fallback cell frequency point information and the position information of the mobile terminal when the mobile terminal falls back into the association table, and forms a position range of a certain cell when the number of the fallen position information corresponding to the certain cell in the association table is enough;
when the mobile terminal establishes a call, the eNB determines the position range of the corresponding cell in which the mobile terminal falls according to the current position information of the mobile terminal and the position range information of the corresponding cell in the association table;
and the eNB extracts the fallback cell frequency point information corresponding to the position range of the corresponding cell in which the mobile terminal falls, sends the fallback cell frequency point information to the mobile terminal, and indicates the mobile terminal to directly fall back according to the cell frequency point.
When the position information corresponding to the cells in the eNB association table is enough, forming a position range of each cell; the coverage area of the cell is generally confirmed according to the position of the cell, the coverage area is generally 200-500 meters in a densely populated area, the coverage area is generally 5-10 kilometers in a suburb area and a remote area, and when the range formed by the position information of the mobile terminal of the cell in the association table is equivalent to or close to the coverage area of the cell, the position information corresponding to the cell in the association table according to the eNB is enough to form a position range of the cell; when a call comes from the mobile terminal C, the mobile terminal C receives a paging request sent by an MME, the mobile terminal C sends an extended service request to the MME, the MME sends a mobile terminal fallback cell indication to an eNB and carries current position information of the mobile terminal C, the eNB judges that the position of the mobile terminal C is located in a position range according to the current position information of the mobile terminal C and corresponding position range information of a corresponding cell in an association table, the eNB extracts a fallback cell frequency point corresponding to the position range and sends the fallback cell frequency point to the mobile terminal C, the mobile terminal C is indicated to directly fall back according to the fallback cell frequency point, and the mobile terminal C directly falls back to establish a call.
Further, the method for optimizing fallback based on location further comprises:
when the eNB measures that the distances between the mobile terminal and all corresponding positions of all relevant cells in the association table are not smaller than a preset threshold value, the eNB instructs the mobile terminal to receive the configured frequency point information of the fallback cells and measure the signal intensity of the fallback cells, the eNB receives the measurement result sent by the mobile terminal, determines a proper fallback cell according to the measurement result, and then sends the frequency point information of the proper fallback cell to the mobile terminal;
the mobile terminal receives the frequency point information of the suitable drop cell and drops the frequency point information to the suitable cell, and if the dropped cell is inconsistent with the cell identifier in the combined attachment, the mobile terminal updates the position;
and when the mobile terminal finishes the call and returns to the LTE network, sending the TAI information, the fallback cell frequency point information and the position information of the mobile terminal when the mobile terminal falls back to the eNB so as to supplement the association table.
Under some specific conditions of this embodiment, for example, at the initial stage of establishing the association table, the returned information is not perfect, or the location of the mobile terminal is remote, because the information of the association table is not perfect, the distance between the measured location information of the mobile terminal and the location information of the cell in the association table is not smaller than the preset threshold, at this time, the fallback can be performed only according to the original fallback method, and when the call is ended and the LTE network is returned, the TAI information, the fallback cell frequency point information, and the location information where the mobile terminal is located when the mobile terminal falls back are sent to the eNB, so as to perfect the association table.
Further, before the MME sends the mobile terminal drop-back cell indication to the eNB, the method further includes:
the MME sends a paging request to the mobile terminal;
the mobile terminal receives a paging request sent by the MME and sends an extended service request to the MME, wherein the extended service request comprises the current position information of the mobile terminal.
Example two
As shown in fig. 2, according to another aspect of the present invention, the present invention further provides a system for optimizing fallback based on location, comprising: eNB1, MME2, and mobile terminal 3;
the eNB1 is used for establishing an association table of TAI information, fallback cell frequency point information and position information of the mobile terminal;
the MME2 is used for sending a mobile terminal falling cell indication to the eNB1 when the mobile terminal 3 establishes a call, and carrying the current position information of the mobile terminal 3;
the eNB1 is further configured to receive current location information of the mobile terminal 3, measure a distance between the current location of the mobile terminal and each corresponding location of each relevant cell in the association table, send the cell frequency point information to the mobile terminal 3 when the measured distance between the mobile terminal 3 and a certain location of one relevant cell in the association table is smaller than a preset threshold, and instruct the mobile terminal 3 to directly fall back according to the cell frequency point; and the number of the first and second groups,
and receiving TAI information, fallback cell frequency point information and position information of the mobile terminal 3 returned to the LTE network by the mobile terminal according to the indicated cell frequency point fallback, and stepping into the association table.
Further, the eNB1 is configured to instruct the mobile terminal 3 to perform fallback directly according to the cell frequency point, and specifically:
the eNB1 receives the TAI information of the mobile terminal 3, the frequency point information of the fallback cell and the location information of the mobile terminal when the mobile terminal falls back, stores the information into the association table, and forms a location range of a certain cell when the number of the location information of the cell corresponding to the certain cell in the association table is enough; and the number of the first and second groups,
when a call is established by the mobile terminal, the eNB1 determines the location range of the corresponding cell into which the mobile terminal 3 falls according to the current location information of the mobile terminal 3 and the corresponding location range information of the corresponding cell in the association table;
the eNB1 extracts the fallback cell frequency point information corresponding to the location range of the corresponding cell in which the mobile terminal falls, and then sends the information to the mobile terminal 3, and instructs the mobile terminal 3 to directly fall back according to the cell frequency point.
Further, the eNB1 is further configured to:
when the eNB1 determines that the distances between the mobile terminal 3 and all corresponding positions of all relevant cells in the association table are not less than the preset threshold, the eNB1 instructs the mobile terminal 3 to receive the configured fallback cell frequency point information and perform measurement of the signal strength of the fallback cell, receives the measurement result sent by the mobile terminal 3 and determines a suitable fallback cell according to the measurement result, and then sends the frequency point information of the suitable fallback cell to the mobile terminal 3;
the mobile terminal 3 is used for receiving the frequency point information of the suitable fallback cell and fallback to the suitable cell, and if the fallback cell is not consistent with the cell identifier in the combined attachment, the mobile terminal updates the position; and the number of the first and second groups,
when the mobile terminal 3 finishes the call and returns to the LTE network, the mobile terminal 3 is further configured to send the TAI information, the fallback cell frequency point information, and the location information of the mobile terminal when the mobile terminal falls back to the eNB1, so as to supplement the association table.
Further, before the MME2 issues the mobile terminal 3 fall back cell indication to the eNB1, the mobile terminal 3 is further configured to:
and receiving a paging request sent by the MME2, and sending an extended service request to the MME2, wherein the extended service request comprises the current position information of the mobile terminal 3.
For the embodiment of the present system, since it basically corresponds to the embodiment of the method, the description is simple, and for the relevant points, reference is made to the corresponding process in the first embodiment of the method, and details are not repeated here.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (6)
1. A method for optimizing fallback based on location, comprising:
the eNB establishes an association table of TAI information of each accessed mobile terminal, cell frequency point information of each fallback cell and corresponding position information;
when a certain mobile terminal establishes a call, the MME sends a mobile terminal falling cell indication to the eNB and carries the current position information of the mobile terminal;
the eNB receives current position information of the mobile terminal, measures the distance between the current position of the mobile terminal and each corresponding position of each fallback zone in an association table, and when the measured distance between the mobile terminal and a certain position corresponding to one fallback zone in the association table is smaller than a preset threshold value, sends cell frequency point information of the fallback zone corresponding to the certain position to the mobile terminal as first cell frequency point information and indicates the mobile terminal to directly fall back according to the first cell frequency point;
the eNB receives TAI information, fallback cell frequency point information and position information of the mobile terminal returned to the LTE network by the mobile terminal after the mobile terminal falls back according to the first cell frequency point, and supplements the TAI information, the fallback cell frequency point information and the position information of the mobile terminal when the mobile terminal falls back into the association table, and when the number of the fallen position information corresponding to a certain cell in the association table is enough, a position range of the certain cell is formed;
when other mobile terminals establish a call, the eNB determines the position range of the fallback cell in which the other mobile terminals fall according to the current position information of the other mobile terminals and the position range of each fallback cell in the association table;
and the eNB extracts the cell frequency point information of the fallback cell corresponding to the position range of the fallback cell in which the other mobile terminal falls, then sends the cell frequency point information as second cell frequency point information to the other mobile terminal, and indicates the other mobile terminal to directly carry out fallback according to the second cell frequency point.
2. The method for optimizing fallback based on location according to claim 1, further comprising:
when the eNB measures that the distances between the mobile terminal and all corresponding positions of all the fallback cells in the association table are not smaller than a preset threshold value, the eNB instructs the mobile terminal to receive the configured fallback cell frequency point information and measure the signal intensity of the fallback cells, the eNB receives the measurement result of the signal intensity of the fallback cells sent by the mobile terminal, determines the fallback cell with the strongest signal intensity according to the measurement result, and then sends the cell frequency point information of the fallback cell with the strongest signal intensity to the mobile terminal;
the mobile terminal receives the cell frequency point information of the fallback cell with the strongest signal strength and falls back to the fallback cell with the strongest signal strength, and if the cell returned by the mobile terminal is inconsistent with the cell identifier during joint attachment, the mobile terminal updates the position;
and when the mobile terminal finishes the call and returns to the LTE network, sending the TAI information, the fallback cell frequency point information and the position information of the mobile terminal when the mobile terminal falls back to the eNB so as to update the association table.
3. The method of claim 1, wherein before the MME sends the eNB a mobile terminal fallback cell indication, further comprising:
MME sends a paging request to the mobile terminal;
the mobile terminal receives a paging request sent by an MME and sends an extended service request to the MME, wherein the extended service request comprises the current position information of the mobile terminal.
4. A system for optimizing fallback based on location, comprising: eNB, MME and mobile terminal;
the eNB is used for establishing an association table of TAI information of each accessed mobile terminal, cell frequency point information of each fallback cell and corresponding position information;
the MME is used for sending a mobile terminal falling cell indication to the eNB when a certain mobile terminal establishes a call, and carrying the current position information of the mobile terminal;
the eNB is further used for receiving current position information of the mobile terminal, measuring distances between the current position of the mobile terminal and each corresponding position of each fallback zone in an association table, and when the measured distance between the mobile terminal and a certain position corresponding to one fallback zone in the association table is smaller than a preset threshold value, sending cell frequency point information of the fallback zone corresponding to the certain position to the mobile terminal as first cell frequency point information and indicating that the mobile terminal directly performs fallback according to the first cell frequency point; and the number of the first and second groups,
receiving TAI information, fallback cell frequency point information and position information of the mobile terminal, returned to the LTE network by the mobile terminal after the mobile terminal falls back according to the first cell frequency point, and supplementing the TAI information, the fallback cell frequency point information and the position information of the mobile terminal when the mobile terminal falls back into an association table, and forming a position range of a certain cell when the number of the fallen position information corresponding to the certain cell in the association table is enough;
the eNB is further used for determining the position range of the fallback cell into which the other mobile terminal falls according to the current position information of the other mobile terminal and the position range of each fallback cell in the association table when the other mobile terminal establishes a call; and the number of the first and second electrodes,
and extracting cell frequency point information of a fallback cell corresponding to the position range of the fallback cell in which the other mobile terminals fall, sending the cell frequency point information to the other mobile terminals as second cell frequency point information, and indicating the other mobile terminals to directly fall back according to the second cell frequency points.
5. The system of claim 4, wherein the eNB is further configured to:
when the eNB measures that the distances between the mobile terminal and all corresponding positions of all the fallback cells in the association table are not smaller than a preset threshold value, the mobile terminal is instructed to receive the configured fallback cell frequency point information and measure the signal intensity of the fallback cells, the measurement result of the signal intensity of the fallback cells sent by the mobile terminal is received, the fallback cells with the strongest signal intensity are determined according to the measurement result, and then the cell frequency point information of the fallback cells with the strongest signal intensity is sent to the mobile terminal;
the mobile terminal is also used for receiving the cell frequency point information of the fallback cell with the strongest signal strength and falling back to the fallback cell with the strongest signal strength, and if the cell falling back by the mobile terminal is not consistent with the cell identifier in the joint attachment, the location is updated; and the number of the first and second groups,
and when the mobile terminal finishes the call and returns to the LTE network, the mobile terminal is also used for sending the TAI information, the fallback cell frequency point information and the position information of the mobile terminal when the mobile terminal falls back to the eNB so as to update the association table.
6. The system of claim 4, wherein before the MME sends the mobile terminal drop cell indication to the eNB, the mobile terminal is further configured to:
and receiving a paging request sent by an MME and sending an extended service request to the MME, wherein the extended service request comprises the current position information of the mobile terminal.
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| CN113630831B (en) * | 2021-09-16 | 2022-08-26 | 中国联合网络通信集团有限公司 | Cell fallback method, terminal and network side equipment |
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