TWI487414B - Mobile network dynamic selection paging method - Google Patents

Description

Mobile network dynamic selection paging method

The invention relates to a paging method for a mobile network, in particular to a mobile network dynamic selection paging method.

Currently, the paging method applied to the mobile network, if it wants to reduce the paging traffic, first guesses the possible location of the user equipment, and then transmits the paging message to the base station where the user equipment may be located; if the user equipment just happens to be Within the coverage of the base station, the paging message does not need to be transmitted to other base stations, so that the purpose of reducing traffic can be achieved; however, because the mobile device has different mobile behaviors, a single paging method often guesses the user equipment. The location, in turn, caused delays in the search, as well as additional paging traffic.

In the case of the US Patent Publication No. 2010075698 (the title of the invention: Location Registration and Paging in Telecommunications Network), it is a common example, which divides the paging method into two phases. The first phase is to transmit the paging message to the use. The last time the device has an interactive tracking cell (Tracking Area); if the user device does not respond, the second phase transmits the paging message to the cells of the entire Tracking Area List. Looking for a user device; this method is for a user device that does not move often. In fact, the user device usually stays at the last interacting cell, but this method will transfer the paging message to the user device for the last time. The tracking area to which the cell belongs, thus causing unnecessary waste of bandwidth, and when the device is very frequent The so-called movement, so that there is no need to stay in the tracking area to which the last interacting cell belongs, this method will first transmit the paging message to the tracking area to which the last interacting cell of the user device belongs, causing unnecessary Bandwidth waste and delay.

Another patent for invention of US Open No. 201120115515 (Invention name: LTE Smart Paging List), by counting the cells that the user equipment mainly stays at different times in the past history; for example, the user equipment usually stays in the cell from 00:00 to 08:00 on Monday. A, Monday from 08:00 to 16:00 is usually staying in cell B, Monday from 16:00 to 24:00, usually staying in cell C, then when the network is looking for users at 9:00 am on Monday morning When the device is used, the network will first transmit the paging message to the cell B according to the historical information. If the user device does not respond, the paging message is transmitted to the cells of the entire tracking area list to find the user device; Historical statistics analyze the usual geographic location of the user equipment, and pass the paging message to the most likely cells to reduce the bandwidth. For the user equipment with regular mobile mode, the paging traffic can be effectively reduced, but for frequent irregular movements. For the user equipment, for example, the mobile phone of the freight or taxi driver, the mobile phone of the salesman who frequently visits the customer, because it does not usually stay in the past history. Cells, this method can not only reduce paging traffic, but will also cause the user to find the device latency increases.

In summary, in fact, each paging method has its advantages and disadvantages. However, because the mobile device's mobile behavior changes, it is necessary to use a fixed single paging method to reduce the paging traffic. In many cases, the paging traffic increases and delays.

In view of the many shortcomings of the above-mentioned old conventional techniques, Nassiga Based on the improvement of innovation and based on the understanding of the evolution of mobile networks, after careful data research, evaluation considerations, test verification and improvement, the invention finally successfully developed the "mobile network dynamic selection paging method".

The purpose of the present invention is to provide a mobile network dynamic selection transmission The calling method is used when searching for user equipment in the telecommunications core network (for example, when there is an incoming call, a short message, or a packet), and utilizing the past behavior of the user equipment in the past, from a variety of paging methods, dynamic and Instantly select the lowest traffic method to find user devices.

According to the purpose of the present invention, a mobile network dynamic selection paging method is provided, wherein when a Mobility Management Entity wants to page a User Equipment, the mobile management entity is read. Recording a search record type of the user equipment; the mobile management entity calculates one of the expected paging traffic required by each paging method according to the search record type; and the mobile management entity when the expected paging traffic of only one paging method is the lowest Automatically selecting the paging method with the lowest expected paging traffic to call to find the user equipment; when there are more than two paging methods, the expected paging traffic is the same, the mobility management entity automatically selects the paging method with the lowest search delay to page the call for the use. After the mobile management entity finds the user equipment, the search result is classified according to the type of the search record type and stored in the mobile management entity.

The search record type of the user equipment recorded by the mobile management entity is read, and the search record type when the mobile management entity searches for the user equipment is read m times, if the history record is less than m times i -1 times, the reading of the latest type when searches search i -1 times the MME to the UE, where i> 1.

The type of the search record refers to the type of the area where the user equipment is located when the mobile management entity finds the user equipment; the search record type includes the following types, but is not limited to the following types: 1. The last interactive cell type: when the mobile management entity finds the user device, the user device is the last interactive cell type to be in the cell where the previous interaction with the network is; 2. Tracking Area type: The tracking area refers to a range of multiple cells. When the mobile management entity finds the user equipment, the user equipment is in the tracking area to which the last interactive cell belongs, but does not stay. The last interactive cell belongs to the tracking area type; 3. the tracking area list type: the tracking area list refers to a plurality of the tracking area, when the mobile management entity finds the user equipment, the user The device is in the tracking area list, but does not stay in the tracking area to which the last interactive cell belongs, and belongs to the tracking area list type.

The step of calculating, by the mobile management entity, the expected paging traffic required by each paging method according to the search record is as follows: according to the recent history record of the search record type, if the paging device is used to find the user equipment by using a specific paging method, Calculating the average paging traffic of the user equipment by using the paging method, and the average paging traffic is the expected paging traffic; repeating the above steps until the average paging traffic calculation of each paging method is completed, that is, each paging method is obtained. The expected paging traffic required.

The paging method may be a last interactive cell (Cell-TA-TAL, abbreviation: CTT) paging method, a last interactive area (TA-TAL, referred to as: TT) paging method, and a full search paging method.

The mobile network dynamic selection paging method provided by the invention has the following advantages compared with the current method:

In order to avoid the shortcomings of the current single paging method, a dynamic selective paging method is proposed. The present invention includes multiple paging methods. According to the past historical mobile behavior of the user equipment, the present invention evaluates the expected paging traffic of each paging method, and then selects The method of expecting the lowest paging traffic Look for user devices to effectively reduce network bandwidth.

2. Even if the mobile device's mobile behavior has many different characteristics, the present invention can dynamically determine the paging method for different user equipments to achieve the lowest paging traffic.

In addition, the present invention is easy to implement in a network architecture and a communication protocol; in the case of an existing LTE (Long Term Evolution) network, only a Mobility Management Entity (MME) component in the core network can be used. This method is implemented; taking the second generation (2G) network, the third generation (3G) network, and the WiMAX network as an example, it is only necessary to modify the Mobile Switching Center (MSC) and GPRS in the core network. The Serving GPRS Support Node (SGSN), the Paging Controller component of WiMAX, and the paging message between the nuclear network and the access network can dynamically determine the paging method and range according to the mobile device's mobile mode to achieve the lowest paging. flow.

101‧‧‧Mobile Management Entity

111~114‧‧‧Base Station

121~124‧‧‧cell

131~132‧‧‧ Tracking area

141‧‧‧ Tracking area list

151‧‧‧User equipment

201~241‧‧‧Step process

301~321‧‧‧Search record type

401~446‧‧‧Message Process

FIG. 1 is a structural diagram of the present invention applied to an LTE mobile network.

FIG. 2 is a flow chart showing the steps of a mobile network dynamic selection paging method according to the present invention.

FIG. 3 is a user equipment search record of a mobile network dynamic selection paging method according to the present invention.

FIG. 4 is a message flow diagram of a mobile network dynamic selection paging method according to the present invention.

FIG. 5 is a first example of a user equipment search record of a mobile network dynamic selection paging method according to the present invention.

FIG. 6 is a second example of a user equipment search record of a mobile network dynamic selection paging method according to the present invention.

The purpose of the present invention is to provide a mobile network dynamic selection transmission The calling method is to dynamically and instantly select paging from multiple paging methods when searching for user equipment in the telecommunications core network (for example, when there is an incoming call, a short message, or a packet), using the past behavior of the user equipment. The lowest-flow method is used to find the user equipment; the method is applied to a mobile management entity. When a core network is looking for a user equipment, the mobility management entity estimates based on the previous user equipment search record. An expected paging traffic of each paging method, and then dynamically selecting a method with the lowest paging traffic to find the user equipment; after receiving the paging message, the user equipment sends the paging response to the mobility management entity, and then the mobile The management entity records the location and type of the user device this time to calculate the expected paging traffic for each paging method for the next search.

The present invention is directed to a paging method designed for a mobile telecommunications network. It is easy to implement in the network architecture and the communication protocol. One embodiment of the present invention can be exemplified with reference to FIG. 1 . The fourth generation mobile communication network LTE is taken as an example to illustrate the operation method of the paging of the present invention, but the present invention It can also be applied to 2G, 3G, WiMAX or other mobile communication networks.

The architecture diagram of the present invention applied to the LTE mobile network is as shown in FIG. LTE is a flat network architecture, a mobility management entity 101 is responsible for mobile management, recording and tracking the location of a user equipment 151, the mobility management entity is connected to a base station 111~114; the base station 111~114 radio The coverage is called a cell 121-124; a plurality of cells constitute a tracking area. As shown in FIG. 1, the tracking area 131 is composed of cells 121 and 122; and the plurality of tracking areas constitute a tracking area list, such as the first The tracking area list 141 is composed of the tracking areas 131 and 132. When the mobile management entity 101 is looking for the user equipment 151, a paging message is sent to the tracking area list 141 to which the user equipment 151 belongs. The base station 111~114, but it is a waste of bandwidth because the paging message is directly sent to all base stations in practical applications. Therefore, a mobile network dynamic selection paging method of the present invention utilizes the past behavior of the user equipment 151 to search for the user equipment 151 from a plurality of paging methods, dynamically and instantaneously selecting the lowest paging traffic; the user After receiving the paging message, the device 151 notifies the mobility management entity 101, and the mobile management entity 101 knows the cell (base station) where the user equipment 151 is currently located.

A flow chart of the steps of the mobile network dynamic selection paging method is shown in FIG. 2, and the steps are as follows: 201: When the mobile management entity 101 wants to page the user equipment 151, the mobile management entity 101 is read. Recording a search record type of the user equipment 151, the mobility management entity 101 calculates one of the expected paging traffic required by each paging method according to the search record type; 211: the mobility management entity 101 compares the expected paging traffic of each paging method, The method for finding the lowest paging traffic; if there is only one method for the lowest paging traffic, step 221 is performed, if the method for the lowest paging traffic exceeds one, step 231 is performed; 221: the mobility management entity 101 automatically selects the lowest expected paging traffic. The paging method is used to page to find the user equipment 151; 231: when there are more than two paging methods, the expected paging traffic is the same, the mobility management entity 101 automatically selects the paging method with the lowest search delay to page the search for the user equipment 151. ; 241: After the mobile management entity 101 finds the user equipment 151, the search result is obtained. Search record type of type classification, and stored in the mobile management entity 101, to prepare for the next paging use.

Among them, the mobility management entity 101 reads the type of the user equipment searches the record 151, the last line reads m search for the mobility management entity 101 to record the type of search the user when the device 151, if the lack of history m times and i -1 times, the most recent i -1 times of the search record type when the mobile management entity searches for the user equipment, where i >1; wherein the search record type refers to the mobile management When the entity 101 finds the user equipment 151, the type of the area where the user equipment 151 is located.

Wherein, the mobility management entity 101 calculates each according to the search record. The step of the expected paging traffic required by the paging method is that, according to the recent history record of the search record type, if the user device 151 is searched by using a specific paging method, the user can be calculated to find the user by using the paging method. One of the devices 151 averages the paging traffic, and the average paging traffic repeats the above steps for the expected paging traffic until the average paging traffic calculation of each paging method is completed, that is, the expected paging traffic required for each paging method is obtained.

The search record of the mobile network dynamic selection paging method of the present invention is shown in FIG. 3; the search record is stored on the mobility management entity 101, and the search record type 301 of the user equipment 151 records each search. Type, if the search type is classified into k , the search record type 301 is 1, 2, ... or k , and the search number 311 represents each search number. For example, the search number 321 represents the third search for the user device. The search record type of the user device is 2.

The invention provides a mobile network dynamically selecting a paging party The use case of the law, this use case is based on the last interactive cell paging method (Cell-TA-TAL, referred to as: CTT), the last interactive area paging method (TA-TAL, referred to as: TT) and the full search paging method as an example, but this Inventing a mobile network dynamic selection paging method is not limited to the use of the three paging methods, but can be combined with other paging methods; CTT, TT, 3G paging methods are described as follows:

1. Last Cell-TA-TAL (CTT): When the mobility management entity 101 searches for the user equipment 151, the mobility management entity 101 first transmits the paging message to a last interactive cell (Last Interacted Cell); if the mobility management entity 101 does not receive the response from the user equipment 151 within a certain time, the mobility management entity 101 transmits the paging message to the last interaction The tracking area to which the cell belongs; if the mobile management entity 101 still does not receive the response from the user equipment 151, the mobility management entity 101 transmits the paging message to all cells in the tracking area list; wherein the last interaction The cell indicates the cell where the user device 151 previously interacted with the network (eg, answering a phone call, making a phone call, updating a location, etc.). The TA of the Cell-TA-TAL refers to the Tracking Area, and the TAL refers to the Tracking Area List. In other words, the method is that the mobile management entity 101 does not find the last interactive cell in the user equipment 151. When the device 151 searches for the user device 151 for all cells in the tracking area to which the last interactive cell belongs, if the user device 151 is still not found in all the cells of the tracking area to which the last interactive cell belongs, the user is searched for the tracking area list. Device 151.

2. Last interactive area paging method (TA-TAL, abbreviated as TT): When the mobile management entity 101 searches for the user equipment 151, the mobility management entity 101 transmits the paging message to the tracking to which the last interactive cell belongs. If the mobile management entity 101 does not receive a response from the user equipment 151, the mobility management entity 101 transmits the paging message to all cells in the tracking area list. The TA of the TA-TAL refers to the Tracking Area, and the TAL refers to the Tracking Area List.

3. Full search paging method: When the mobility management entity 101 searches for the user equipment 151, the mobility management entity 101 transmits a paging message to all cells in the tracking area list, which is adopted by the third generation mobile communication network. The method is called the following 3G paging method.

The present invention is a use case of a mobile network dynamic selection paging method. This use case divides the search record type of the user equipment 151 into three categories, but the mobile network dynamic selection paging method of the present invention is not limited. 3 types of search records:

1. A final interactive cell type: When the mobile management entity 101 looks for the user device 151, the user device 151 is to stay at the last interactive cell.

2. A tracking area: When the mobile management entity 101 searches for the user equipment 151, the user equipment 151 is to stay in the tracking area to which the last interactive cell belongs, but does not stay in the last interactive cell.

3. Tracking area list: When the mobile management entity 101 searches for the user equipment 151, the user equipment 151 stays in the tracking area list, but does not stay in the tracking area to which the last interactive cell belongs.

The use case of the mobile network dynamic selection paging method is automatically selected from the three paging methods, such as CTT, TT, and 3G, wherein the expected paging traffic is the lowest to find the user equipment 151; when the mobility management entity The calculation of the expected paging traffic by the most recent m search records of the user equipment 151, the mobile management entity 101 calculates three types of paging methods, such as CTT, TT, and 3G, when the user equipment is searched for the i- th time, the expected paging traffic is C. _s ( i ), where s represents a paging method, which is CTT, TT or 3G; m *=min{ i -1, m }; N _{C is} the number of cells in the tracking area; N _T represents the tracking area list The number of tracking areas; between im* search and i-1 search, n ₁ ( i ) represents the number of times the user device is staying at the last interactive cell, and n ₂ ( i ) represents the user device staying The tracking area to which the last interactive cell belongs, but does not have the number of times the last interactive cell is held, n ₃ ( i ) represents that the user device is staying in the tracking area list but does not stay in the tracking area to which the last interactive cell belongs. Number of times, where m and i is a positive integer; then C _s ( i ) is calculated as follows: When i =1, since there is no search data of past history, it is assumed that C _s (1)=0; when i>1, C _3G ( i )= N _C N _T ; according to the above use case, then compare the size of C _CTT ( i ), C _TT ( i ) and C _3G ( i ), and select the paging method with the smallest expected paging traffic. The user equipment 151 is searched; if the expected paging traffic of the two or more methods is the smallest at the same time, the method with the lowest search delay is selected to find the user equipment 151; and the three paging methods are taken as an example, the 3G paging method The search delay is the lowest, the TT paging method is second, and the CTT paging method has the highest search delay. When the mobile management entity 101 finds the user equipment 151, the search result is classified according to the search record type and stored in the mobile management. Entity 101, the next search for profit.

A message flow diagram of a mobile network dynamic selection paging method of the present invention is shown in FIG. 4; FIG. 4 assumes that the last interactive cell of the user equipment 431 is the radio coverage of the base station 421, however, the user equipment 431 Currently, it is the coverage of the base station 411. The base stations 411 and 421 belong to the same tracking area. If the mobile management entity 401 is looking for the user equipment 431, since the expected paging traffic of the CTT method is the lowest, it is selected to be used. The CTT method; in the CTT method, the mobility management entity 401 transmits the paging message 441 to the base station 421 (the last interactive cell). Then, because the user equipment 431 does not have the radio coverage of the base station 421, the mobility management entity 401 does not receive a response from the user equipment 431 for a period of time, and then the mobility management entity 401 associates the paging message 442 with 443 is passed to the tracking area to which the last interactive cell belongs, that is, the base stations 411 and 421. Because the user equipment 431 is waiting for the radio at the base station 411 Within the signal range, the paging message 444 is received. The user equipment 431 notifies the mobile management entity 401 of the current location through the paging responses 445 and 446.

An example of the use case of the mobile network dynamic selection paging method for calculating the expected paging traffic is as follows: 1. Suppose a tracking area list contains 5 tracking areas ( N _T = 5), and one tracking area contains 6 cells ( N _C = 6), then a tracking area list contains N _C N _T = 30 cells; 2. Assume that the mobility management entity 101 records the last 10 search records of the user equipment 151 ( m = 10); The record is shown in Figure 5, and now the fifth search ( i = 5), because there are only 4 search records in the past history, less than 10, so it can be used to calculate the historical search record of the average paging traffic. Only 4 (m*=min( i -1, m )=4), we can see from figure 5 that n ₁ (5)=1, n ₂ (5)=1, n ₃ (5)=2, according to n ₁ (5), n ₂ (5), n ₃ (5), N _T , N _C , C _CTT (5) are calculated as follows:

C _CTT (5) is to calculate the average paging traffic caused by using the CTT paging method in past historical m * searches. In this formula, The meaning of the representative is that in the past m * times of searching, the user equipment 151 has n ₁ (5) times to stay in the last interactive cell, and in this case, using the CTT paging method will only result in 1 paging. flow; The meaning of the representative is that in the past m * times of searching, the user device 151 has n ₂ (5) times to stay in the tracking area to which the last interactive cell belongs, but does not stay in the last interactive cell, here In this case, using the CTT paging method will result in 1+ N _C paging traffic. The meaning of the representative is that in the past m * times of searching, the user equipment 151 stays in the tracking area list, but does not stay in the tracking area to which the last interactive cell belongs, in which case the CTT paging method is used. Will cause 1+ N _C + N _C N _T paging traffic.

In addition, the formula interpretation of C _TT (5) and C _3G (5) is similar to C _CTT (5), so it will not be described again. The calculation results are as follows:

C _3G (5) = N _C N _T = 30

Since C _CTT (5)=20.5 is smaller than C _TT (5)=21 and C _3G (5)=30, at the 5th search, the mobility management entity 101 uses the CTT paging method to find the user equipment 151. .

If the record of the search record type is as shown in Fig. 6, it is assumed that the 14th search is now performed ( i = 14). Although there are 13 search records in the past history, the mobile management entity 101 only uses the last 10 searches. Search records to calculate average paging traffic (m*=min( i -1, m )=10); Figure 6 is a search history of 13 past history, but since the mobile management entity 101 only uses the last 10 records, It can be seen from Fig. 6 that n ₁ (14) = 1, n ₂ (14) = 6, and n ₃ (14) = 3.

Therefore, the C _CTT (14) can be calculated as follows:

C _TT (14) is calculated as follows:

C _3G (14) is calculated as follows: C _3G (14) = N _C N _T = 30

Since C _TT (14)=15 is less than C _CTT (14)=15.4 and C _3G (14)=30, at the 14th search, the mobility management entity uses the TT paging method to find the user equipment 151.

The detailed description of the present invention is intended to be illustrative of a preferred embodiment of the invention, and is not intended to limit the scope of the invention. The patent scope of this case.

To sum up, this case is not only innovative in terms of technical thinking, but also has many of the above-mentioned functions that are not in the traditional methods of the past. It has fully complied with the statutory invention patent requirements of novelty and progressiveness, and applied for it according to law. Approved this invention patent application, in order to invent invention, to the sense of virtue.

201~241‧‧‧Step process

Claims (9)

A mobile network dynamic selection paging method includes the following steps: when a mobile management entity wants to page a user equipment, reading a search record type of the user equipment recorded by the mobility management entity; The search record type calculates one of the expected paging traffic required by each paging method; when the expected paging traffic of only one paging method is the lowest, the mobility management entity automatically selects the paging method with the lowest expected paging traffic to call the user. The device; when the expected paging traffic of the two or more paging methods is the same, the mobility management entity automatically selects the paging method with the lowest search delay to page the search for the user equipment; and after the mobile management entity finds the user equipment, The search results are classified according to the type of the search record type and stored in the mobile management entity. The mobile network dynamic selection paging method according to claim 1, wherein the reading the record type of the user equipment recorded by the mobility management entity is read, and the mobile management entity searches for the latest m times. when a user searches for the record type of the device, if the record is less than m times and for the times i -1, i -1 is read latest search times to search for the mobile management entity of the user recording device type, where i> 1 , where m and i are both positive integers. The mobile network dynamic selection paging method according to claim 1 or 2, wherein the search record type refers to a type of the area where the user equipment is located when the mobile management entity finds the user equipment. For example, the mobile network dynamic selection paging method described in claim 3, The type of the search record includes the following types: a last interactive cell. When the mobile management entity finds the user device, the user device is in the cell where the previous interaction with the network is located, and the last is the last An interactive cell type; a tracking area, where the tracking area refers to a range of cells, when the mobile management entity finds the user equipment, the user equipment is in the tracking area to which the last interactive cell belongs. However, the last interactive cell does not belong to the tracking area type; a tracking area list, the tracking area list refers to a plurality of the tracking area, when the mobile management entity finds the user equipment, The user equipment is in the tracking area list, but does not stay in the tracking area to which the last interactive cell belongs, and belongs to the tracking area list type. The mobile network dynamic selection paging method according to claim 1, wherein the mobile management entity calculates the expected paging traffic required by each paging method according to the search record as follows: according to the recent history of the search record type Recording, if the paging device is used to find the user equipment by using a specific paging method, it can be calculated to find an average paging traffic of the user equipment by using the paging method, and the average paging traffic is the expected paging traffic; repeating the above steps, Until the average paging traffic calculation for each paging method is completed, the expected paging traffic required for each paging method is obtained. For example, in the mobile network dynamic selection paging method described in claim 1, wherein one of the paging methods is the last interactive cell paging method, and the last interactive cell paging method includes the following steps: When the mobility management entity searches for the user equipment, the mobility management entity first transmits a paging message to a last interactive cell, where the last interactive cell is one of the previous interactions of the user device with the network. a cell, and the cell system refers to a base station radio coverage; if the mobile management entity does not receive the user equipment response within a certain period of time, the mobility management entity transmits the paging message to a tracking to which the last interactive cell belongs a region, wherein the tracking region refers to a range of the plurality of cells; if the mobile management entity still does not receive the user device response within a certain time, the mobility management entity transmits the paging message to the tracking region list All cells within the cell, wherein the tracking area list refers to a range of the plurality of tracking areas; and when the mobile management entity receives the user device response, the mobile management entity finds the cell location of the user device . The mobile network in item 6 of the patent application range of the dynamic paging selection method with which the user has recently MME searches m times the recording apparatus, the mobility management entity calculates the i-th user to find the The method for the expected paging traffic C _CTT ( i ) of the device is as follows: Where m *=min{ i -1, m }, i >1, N _{C is} the number of cells in the tracking area, and N _T represents the number of tracking areas in the tracking area list, in im* times search and i- Between 1 search, n ₁ (i) represents the number of times the user device is staying at the last interactive cell, and n ₂ (i) represents that the user device is staying in the tracking area to which the last interactive cell belongs but does not stay The number of times the last interactive cell, n ₃ (i) represents the number of times the user device is staying in the tracking area list but does not stay in the tracking area to which the last interactive cell belongs, and m and i are both positive integers. The mobile network dynamic selection paging method according to claim 1, wherein one of the paging methods is the last interactive area paging method, and the last interactive area paging method comprises the following steps: when the mobile management entity searches for the The user management device transmits a paging message to the tracking area to which the last interactive cell belongs, wherein the last interactive cell is one of the cells of the user device that previously interacted with the network. And the cell system refers to a base station radio coverage area, where the tracking area refers to a range of a plurality of the cells; if the mobile management entity does not receive the user equipment response, the mobility management entity transmits the paging message to the Tracking all the cells in the area list, wherein the tracking area list refers to a range of the plurality of tracking areas; when the mobile management entity receives the user equipment response, the mobile management entity finds the user equipment Where the cell is located. The mobile network in item 8 of the patent application range of the dynamic selection method ,, which paging management entity with which the mobile user m searches recent times recording equipment, mobility management entity calculates the i-th used to find the The method for predicting the paging traffic C _TT ( i ) of the device is as follows: Where m *=min{ i -1, m }, i >1, N _{C is} the number of cells in the tracking area, and N _T represents the number of tracking areas in the tracking area list, in im* times search and i- Between 1 search, n ₁ (i) represents the number of times the user device is staying at the last interactive cell, and n ₂ (i) represents that the user device is staying in the tracking area to which the last interactive cell belongs but does not stay The number of times the last interactive cell, n ₃ (i) represents the number of times the user device is in the tracking area list but does not stay in the tracking area to which the last interactive cell belongs, where m and i are both positive integers.