WO2011000261A1 - 移动终端寻呼方法和移动呼叫中心设备 - Google Patents

移动终端寻呼方法和移动呼叫中心设备 Download PDF

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Publication number
WO2011000261A1
WO2011000261A1 PCT/CN2010/073969 CN2010073969W WO2011000261A1 WO 2011000261 A1 WO2011000261 A1 WO 2011000261A1 CN 2010073969 W CN2010073969 W CN 2010073969W WO 2011000261 A1 WO2011000261 A1 WO 2011000261A1
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Prior art keywords
paging
mobile terminal
cell
distribution
service
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PCT/CN2010/073969
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English (en)
French (fr)
Inventor
赵红霞
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP10793556.1A priority Critical patent/EP2439985B1/en
Publication of WO2011000261A1 publication Critical patent/WO2011000261A1/zh
Priority to US13/337,838 priority patent/US8478293B2/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W68/00User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/04User notification, e.g. alerting and paging, for incoming communication, change of service or the like multi-step notification using statistical or historical mobility data

Definitions

  • the embodiments of the present invention relate to the field of wireless communications technologies, and in particular, to a mobile terminal paging method and a mobile call center device. Background technique
  • the modern public land mobile communication network is based on a cellular architecture that enables mobile communications for users.
  • the core technology in this architecture is location management. It consists of two parts: location tracking for idle mode terminals, and how to ensure the continuity of services after the location change in the transmission mode is also called handover technology.
  • location management In the existing mainstream cellular communication systems, such as 2G and 3G systems, a two-level location management method is generally adopted.
  • the first layer constituting the location management is a cell, and the second layer is a location area (LA), which is a base of location tracking, and each location area LA is composed of multiple cells.
  • the terminal checks whether the location area has changed. If a change occurs, the new location information is actively sent to the network; when the call arrives, the network performs paging in all the cells covered by the location area last reported by the terminal.
  • the inventors have found that at least the following problems exist in the prior art:
  • the location update is performed, but when the terminal is in
  • the new location information is not reported, so the network can only know which location zone the current terminal is in, but does not know which cell is covered by the specific cell.
  • a prior art requires paging in the entire location area, and the paging air interface resource has a large overhead.
  • Another prior art adopts a dynamic location area management method for optimizing a single terminal, and the terminal keeps track of the user's movement trajectory, regardless of whether the current terminal is in an idle state or a service state, and the terminal reports the user trajectory if it changes.
  • the network optimizes the location area, and the network optimizes the paging area to optimize the paging area. This will result in the complexity of network implementation and management, and because the terminal needs to frequently report the user's movement trajectory, the waste of air interface resources is still serious. Summary of the invention
  • the embodiments of the present invention provide a mobile terminal paging method and a mobile call center device, which are used to solve the defects of complex network implementation and serious waste of air interface resources in the prior art, thereby reducing the complexity of network implementation and saving air interface resources.
  • An embodiment of the present invention provides a paging method for a mobile terminal, including:
  • An embodiment of the present invention provides a mobile call center device, including:
  • a first processing module configured to receive a service call request, and select a corresponding posterior probability table according to the identifier of the target mobile terminal included in the service call request, where the posterior probability table includes the target mobile terminal being in a service state a distribution probability of each cell in the location area; a paging module, selecting a cell to page the target mobile terminal according to the distribution probability.
  • the paging method of the mobile terminal and the mobile call center device provided by the embodiment of the present invention are based on the distribution probability of each user in the service state, and the paging process is more concise and flexible, and the applicable scenario is more extensive. In the case of paging efficiency, air interface resources are saved.
  • FIG. 1 is a flowchart of a paging method of a mobile terminal according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a network system for applying a paging method of a mobile terminal according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a mobile call center device according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a mobile call center device according to another embodiment of the present invention.
  • the embodiment of the present invention analyzes the location management purpose of the current cellular network, and the purpose of the location management is not to know when the mobile terminal appears at any time, but to quickly and accurately page the mobile terminal when the call arrives. So that it does not miss the business. Therefore, the embodiment of the present invention provides a solution for the purpose of location management, that is, dynamically obtaining the distribution probability of the mobile terminal's service in each cell, and optimizing the paging based on this, which is more than tracking the user's movement trajectory. For the sake of brevity, in the case of ensuring paging efficiency, air-saving resources are saved, and it is more flexible and applicable to a wider range of scenarios.
  • An embodiment of the present invention provides a paging method for a mobile terminal, including receiving a service call request, and selecting a corresponding posterior probability table according to the identifier of the target mobile terminal included in the service call request, where the posterior probability table includes The distribution probability of the target mobile terminal in each cell in the location area in the service state, and then selecting the cell to page the target mobile terminal according to the distribution probability.
  • the mobile call center after receiving the service call request that includes the identifier of the target mobile terminal, the mobile call center searches for a posterior probability table corresponding to the target mobile terminal according to the identifier, and then performs paging on the target mobile terminal, where the paging may be specifically According to the order of distribution probability from large to small, the cells with large distribution probability are preferentially selected for paging, that is, paging is performed in order of distribution probability from large to small.
  • the posterior probability table includes the distribution probability of the target mobile terminal in each cell in the location area, that is, the posterior probability table includes the distribution probability information of all the cells of the mobile terminal in the location area, and the mobile terminal does not have The distribution probability of the cell that has arrived is zero.
  • Each cell in the a posteriori probability table involved in each embodiment of the present invention is all cells in the location area to which the mobile terminal belongs.
  • each cell in the a posteriori probability table may be divided into a plurality of paging sets, and The paging set is paged for the unit.
  • paging is to page all cells in the a posteriori probability table; when each cell in the posterior probability table is divided into one In the paging set, the paging is to page one cell at a time; of course, each cell in the a posteriori probability table may be divided into a plurality of paging sets with different priorities for paging, and the distribution probability is prioritized.
  • the large cell is divided into a high priority paging set, and when paging, the target mobile terminal is recorded at all times in the paging set according to the priority of the paging set from high to low.
  • the distribution probability of each cell in the service state may be established in units of time segments, and each posterior probability table reflects the distribution probability within a time period, which can make the paging more accurate. The following is a detailed description of maintaining a plurality of posterior probability tables corresponding to different time segments as an example.
  • FIG. 1 is a flowchart of a method for paging a mobile terminal according to an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps:
  • Step 100 Receive a service call request, and select a corresponding posterior probability table according to the identifier of the target mobile terminal included in the service call request and the time when the service call request is received, where the posterior probability table includes The distribution probability of the target mobile terminal in each cell in the location area in the service state;
  • the posterior probability table described in this embodiment is a distribution probability that is maintained by the mobile call center or is maintained by other network elements and can be called by the mobile call center, and includes a distribution probability of the mobile terminal in each cell in the location area in the service state. Specifically, assuming that Bi represents an event in which the user appears in the cell Ci, and A represents an event in which the user is in a service state, P ( Bi ) represents the probability that the user appears in the cell Ci, and P ( Bi
  • the distribution probability in the cell Ci in the service state is also called the posterior probability.
  • the existing method is mainly to obtain the distribution information of the user in each cell based on the user history information, such as P ( Bi ), and then perform paging based on the distribution information.
  • the embodiment of the present invention is based on the correlation of the user in each cell in the service state. Information, obtain the posterior probability P ( Bi
  • the network statistics information of the cell visited by the terminal in the service state after a period of statistics, the mobile terminal is in a different state in the location area according to the statistical information.
  • the posterior probability table is related to the time period, and different time periods correspond to different posterior probability tables.
  • first it is necessary to determine which time period corresponds to the posterior probability table, according to the mobile terminal in each cell.
  • the mobile call center After receiving the service call request, the mobile call center first determines which time period the time when the service call request is received belongs to, and selects a posterior probability table corresponding to the identifier of the target mobile terminal carried in the service call request.
  • Step 101 Divide each cell in the a posteriori probability table into a plurality of paging sets having the same number of times as the maximum paging number, where the paging set is obtained in descending order according to the distribution probability.
  • the maximum number of paging times is obtained according to a maximum allowed call delay time of the service call request and each paging time;
  • the posterior probability table includes posterior probability information of multiple cells, that is, the range of the paging of the mobile call center is all cells in the posterior probability table, and Since each cell corresponds to a different a posteriori probability, if the paging efficiency needs to be improved, if the paging delay is allowed, the paging may be first performed in several cells with a large posterior probability, since The probability of detection is high, so the paging success rate is relatively high.
  • the mobile call center sorts the distribution probabilities of the cells in descending order; then, each cell in the a posteriori probability table is divided into a plurality of paging sets having the same number of maximum paging times, That is, a plurality of cells with a large distribution probability are preferentially allocated to one paging set, and a plurality of cells with medium distribution probability are allocated to other paging groups, and a plurality of cells with the lowest distribution probability are allocated to another paging.
  • all cells in such a location area are sequentially allocated to a plurality of paging sets having different priorities according to the size of their corresponding distribution probabilities.
  • the number of established paging sets may be the same as the maximum number of paging times. The maximum number of paging times is obtained according to the maximum allowed call delay time of the service call request and each paging time, and is specifically obtained by dividing the call delay time by each paging time.
  • Step 102 Paging the target mobile terminal in descending order according to the distribution probability according to the paging set.
  • the mobile call center allocates each cell to a maximum number of paging times, and can perform paging in a maximum allowed call delay time, paging all cells in one paging set at a time, and each seeking The call set has a priority, and the mobile call center may select the corresponding paging set to perform paging according to the order of priority from high to low. Specifically, the paging set with high priority may be firstly paged. If the paging succeeds, the paging is stopped; if the paging fails, the paging set of the medium distribution probability is paged, and so on, and finally the paging set with the low distribution probability is paged.
  • the paging efficiency is not lowered.
  • the maximum allowed call delay time of a service is long, such as a short message service, paging can be performed in several times. If the maximum allowed call delay time of the service is short, such as an emergency call, all cells can be included. In a paging set, and the mobile call center performs paging only once, all cells in the a posteriori probability table are paged.
  • the mobile call center calculates the maximum number of pages that can be made according to the current service delay requirement.
  • the mobile call center is based on the distribution probability of each cell in the mobile terminal service state and the maximum allowed for the current service.
  • the number of pagings determines to use one or more pagings, and each paging selects one or more cells with the highest probability of distribution in each cell in the terminal service state to perform paging until the paging is successful.
  • the paging method of the mobile terminal provided in this embodiment is based on the probability of distribution in each cell when the user is in a service state, and the paging process is more compact and flexible, and the applicable scenario is more extensive, and the paging efficiency is ensured. Next, it saves air resources.
  • the following describes a method for dynamically obtaining the probability of distribution in each cell under the mobile terminal service state.
  • the network knows that it is currently in a business state.
  • the information about the mobile terminal is collected, so that information such as all the cell information of the service and the duration of the service in the cells can be collected, and the network can also easily collect information such as the moving speed of the terminal in each cell during the service.
  • the information collection, storage, and processing are costly.
  • this embodiment uses the following method to collect the distribution information of each cell in the service state of the mobile terminal.
  • the specific process may be the first measurement on the network side.
  • the distribution information may include the number of times the response of the target mobile terminal corresponding to each cell is called, the number of times the primary call and the response are called, or the length of the service. The following three cases are respectively introduced.
  • One method is to count only the number of times the mobile terminal responds to a call in each cell. Because the current distribution probability of the mobile terminal in each cell is to page the mobile terminal and establish a service connection when the next called service arrives, it is a reasonable and simple method to count the response of the mobile terminal based on the service. .
  • a ) number of times the mobile terminal is called in the cell Ci during the statistical time divided by the total number of times the mobile terminal is called in all cells in the statistical time.
  • Another method is to count the number of times the mobile terminal initiates a primary call in each cell, and also counts the number of times the response is called.
  • the cell in which the main call service occurs is also the cell in which the called service occurs. Therefore, in order to increase the number of samples, the number of primary calls and the number of called calls can be counted in the cell, based on the sum of the number of primary calls and the number of called calls.
  • the probability of distribution of mobile terminals in each cell is as follows:
  • Another method is to count the length of time that the service passes in the cell, and calculate the distribution probability of each cell in the mobile terminal service state by using the duration.
  • a ) the total service duration of the mobile terminal in the cell Ci during the statistical time divided by the total service duration of the mobile terminal in all cells in the statistical time.
  • the network side for example, the mobile call center can establish a posterior probability table according to the identifier of each cell and the corresponding distribution probability, that is, the posterior probability table includes the identifiers of the cells and corresponding
  • the distribution probability may also include a specific value, such as a service duration of a service performed by a corresponding cell.
  • the embodiment of the present invention further describes a method for storing and processing internal data of the network based on the third method.
  • the statistical period is the key to obtain a stable posterior probability P ( Bi
  • different statistical periods can be used, there are several important cycles in people's lives: days, weeks. Most people's lives are repeated periodically in days and weeks. And different people have different critical time periods in a day, but for most people day and night are two key time periods. Although different people have different ways of living and moving in a week, for most people, one week of workdays and rest days are two important time periods. Based on the above analysis, after considering the simplicity and practicability, the present embodiment uses the following method to give a statistical period.
  • the statistical period is set to one week. Considering the lifestyle characteristics of most people in different time periods on different days of the week, the time periods are divided for different time periods in a period, and the time segments are divided as shown in Table 1.
  • the network processes the statistical data, and calculates the posterior probability of the mobile terminal distribution in each cell for different time periods for the data of different statistical periods.
  • the network divides the statistical period into at least one time period, and establishes a posterior probability table corresponding to each time segment.
  • the mobile terminal When the mobile terminal enters a location area for the first time, it has not yet experienced a complete statistical period and obtains a stable posterior probability information. At this time, the required probability can still be calculated based on the existing statistical information, and paging is performed based on the probability information. The only difference is that there are fewer samples at this time, and the deviation of statistical probability is larger.
  • the network After statistically obtaining the posterior probability P ( Bi
  • indicates the total number of cells included in the location area; assume that the air interface resource cost of one cell in one cell is C P; assume that in the primary service, the network sends all the relevant cell air ports in the location area.
  • the network divides all the cells in the location area into a set according to the maximum number of paging times currently allowed.
  • the set is represented as follows: (7) Qj ,
  • the priority is as follows: , . . . S K , the network first pages in the set 1 , and if the terminal responds to the paging, stops paging. If the terminal does not respond, the cells in the set 1 ⁇ to the set are sequentially paged, and when the paging response is received in the middle, the paging is stopped.
  • the network sequentially pages in each set according to the priority of the paging set from high to low until the terminal responds.
  • a partitioning method is to divide each cell in the a posteriori probability table into a plurality of paging sets having the same number of maximum paging times, that is, equal to the number of cells, which is the simplest method.
  • Another method of partitioning is to divide each cell in the a posteriori probability table into a plurality of paging sets having the same number of maximum paging times according to a predetermined rule, where the predetermined rule includes: selecting a minimum number of cells Paging the set such that ⁇ , P 2 > P t2 , ..., where P k represents the inclusion of the first paging set to the Ath paging set in the paging set
  • the sum of the distribution probabilities corresponding to the cells indicates the kth paging success probability threshold, k and K are positive integers, and 0 ⁇ k ⁇ K, indicating the maximum number of pagings.
  • the above method is to divide the cell into ⁇ sets according to the set cumulative probability gate P ⁇ of each paging success, specifically, the network gives the paging success probability threshold value ⁇ by minimizing the principle of air interface resource overhead, and There is ; ⁇ P tK , assuming that the number of cells included in each set is n xr> n 2 ; n k ",, n K ? assuming posterior probability corpse ('' Sorted to small, p (A represents the greatest posterior probability, ie corpse (AIA) > P(B 2 1 A) >"..PIA).....> P ⁇ B N
  • the sum of the posterior probabilities of all cells in the A set is represented by P k , so there is
  • the posterior probability sum should be greater than the first gate P ⁇ value P tk .
  • the network puts ⁇ into the current set according to ⁇ ( ⁇ ⁇ ) from the largest to the smallest, until the probability of the cell in the current set and ⁇ ) plus ⁇ ...Sw set
  • the first paging set 1 ⁇ is formed because of the probability of the first two cells. If it is equal to 0.862, it can be greater than the paging success probability threshold P ⁇ , so the cell with the cell index numbers C1 and C2 is selected to be put into the set* ⁇ as the cell set of the first paging, and if there is no response, the remaining in the location area Paging is performed in the cell.
  • the foregoing embodiment describes a method for paging based on the distribution probability of each mobile station when the mobile terminal is in a service state, and describes how to perform statistics on the release probability and the principle of dividing the paging set.
  • the following embodiments are combined with the figure. 2 is a detailed implementation flow of a mobile terminal paging method according to an embodiment of the present invention.
  • 2 is a schematic diagram of a network system composition method for applying a paging method of a mobile terminal according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a current cellular system, such as a Global System For Mobile Communication (GSM) system.
  • GSM Global System For Mobile Communication
  • the cells included in the location area LA are respectively managed by the first base station (Base Station Sub-system; BSS) and the second BSS two access network devices.
  • BSS Base Station Sub-system
  • the first BSS and the second BSS are both connected to the same Mobile Switching Center (hereinafter referred to as MSC), so the MSC is responsible for managing the mobility of the terminal in the location area LA, that is, the mobile terminal enters the location area.
  • MSC Mobile Switching Center
  • the MSC adopts a certain paging policy according to the location information held by the VLR or the HLR. Paging in the zone.
  • the description of the method provided by the embodiment of the present invention is as follows: 1. The network obtains the posterior probability P ( Bi
  • the MS When the MS generates a service in the cell C13, the MS establishes a radio access connection with the first BSS, so the first BSS knows that the current MS service occurs in the cell C13, and also knows that the MS's service is in the C13. The length of time that occurred was tl3. Because the connection between the first BSS and the MSC is also established during the service, the first BSS can easily report the related information to the MSC;
  • a connection is established between the first BSS and the second BSS, and the first BSS may report the recorded U3 information to the MSC through the connection between the first BSS and the MSC.
  • the first BSS sends the tl3 to the second BSS through the interface between the first BSS and the second BSS, and is temporarily saved by the second BSS.
  • the second BSS will record locally.
  • T21 the duration of the service of the MS in the cell C21
  • the U3 are sent to the MSC through the interface between the second BSS and the MSC;
  • the MSC can store the Table 3 information in the VLR or HLR.
  • the HLR sends a message to the MSC.
  • the MSC can choose to save the posterior probability table of the MS in the location area LA as Table 3 to the MS.
  • the VLR or HLR Because the VLR or HLR's ability to store information is always limited, the VLR or HLR can set an aging time for the MS's post-probability table in different location areas. If the aging time arrives, the record is not accessed. You can delete the record.
  • the network uses the location distribution table for paging:
  • MS identifier such as a mobile phone number or an Customer Identification Number (IMSI);
  • the MSC After the MSC checks the maximum length of time that the current call service can tolerate, it can calculate that the service can only page up to 2 times. In addition, the MSC has set the threshold values of the two pages to be 80% and 100%, respectively. Therefore, the MSC divides all cells of the location area LA into two sets, the first set includes C17, C23, C16 and C18, and the second set includes the remaining cells of the location area. The MSC first pages in the first set. If the terminal MS responds to the page, the MSC stops paging, and if the terminal MS does not respond to the page, the MSC pages in the second set.
  • the MSC when the MSC sends a paging in a different cell, the paging message needs to be sent to the corresponding BSS, and the BSS sends a paging in each cell. Since the number of bytes occupied by the cell identifier in the current network is relatively large, when the MSC instructs the BSS to send a paging message in multiple cells, the interface between the MSC and the BSS needs to carry multiple cell identifiers. In order to save the transmission bandwidth, a different bit (Bit) bit can be allocated between the MSC and the BSS, and a map is used to indicate whether a paging message needs to be sent in the corresponding cell.
  • Bit Bit
  • 10 bits can be used to indicate whether the 10 cells need to be sent, because This can be represented by two bytes. If C10 to C19 are identified from low to high, the position corresponding to no cell is zero, as shown in Table 4.
  • the MSC instructs the first BSS1 to place a page in C17, C16 and C18
  • the MSC will set the corresponding 6th, 7th, and 8th positions in Table 4 to 1, and the other positions to 0, expressed in hexadecimal notation. 01 C0H.
  • the case of indicating the second BSS will not be described here.
  • the paging method of the mobile terminal is based on the probability of distribution in each cell when the user is in a service state, and the paging process is more compact and flexible, and the applicable scenario is more extensive, and the paging efficiency is ensured. In this case, the air interface resources are saved.
  • FIG. 3 is a schematic structural diagram of a mobile call center according to an embodiment of the present invention.
  • the mobile call center device includes a first processing module 11 and a paging module 12, where the first processing module 1 1 is configured to receive services. a call request, and selecting a corresponding posterior probability table according to the identifier of the target mobile terminal included in the service call request, where the posterior probability table includes a distribution probability of each cell in the location area of the target mobile terminal in the service state
  • the paging module 12 is configured to select a cell to page the target mobile terminal according to the distribution probability.
  • the mobile call center device provided in this embodiment may be an MSC.
  • This embodiment uses an MSC as an example for description.
  • the first processing module 11 in the MSC After receiving the new service call request, the first processing module 11 in the MSC obtains the identifier of the target mobile terminal from the service call request, and then obtains a corresponding posterior probability table according to the identifier, where the posterior probability table is included.
  • the distribution probability of the mobile terminal in each of the cells in the service state; after the first processing module 11 obtains the posterior probability table for paging, the paging module 12 is responsible for the target mobile terminal according to the posterior probability table. Paging.
  • the publishing probabilities corresponding to all the cells included in the limited posterior probability table are sorted according to the size, and then the cells with large distribution probabilities are preferentially selected for paging, that is, paging is sequentially performed according to the distribution probability from large to small.
  • the posterior probability table may be only one table, wherein the distribution probability of the target mobile terminal in each cell in the service state at all times is recorded, and of course, multiple posterior may be established in units of time segments.
  • the probability table, each posterior probability table reflects the probability of distribution over a period of time, which can make the page more accurate.
  • the first processing module 11 is further configured to select a corresponding posterior probability according to the identifier of the target mobile terminal included in the service call request and the time when the service call request is received. table. After receiving the service call request, the first processing module 11 first determines the reception time, and then performs paging according to the time and the identifier selection corresponding posterior probability table.
  • the mobile call center device provided in this embodiment performs paging based on the distribution probability of each user in the service state when the user is in a service state, and the paging process is more concise and flexible, and the applicable scenario is more extensive. Moreover, in the case of ensuring paging efficiency, air interface resources are saved.
  • the mobile call center device includes a first processing module 11 and a paging module 12, wherein the paging module 12 includes a first process.
  • the first processing sub-module 121 is configured to divide each cell in the a posteriori probability table into a plurality of paging sets having the same number of times as the maximum paging number, where the searching The call set is obtained in descending order according to the distribution probability, and the maximum paging number is obtained according to the maximum allowed call delay time and each paging time of the service call request;
  • the second processing sub-module 122 is configured to: The target mobile terminal is paged in descending order according to the distribution probability in units of paging sets.
  • the first processing sub-module 121 divides a plurality of cells into a plurality of paging sets, and the number of paging sets is the same as the maximum number of paging times, and preferentially divides cells with large distribution probability into high priority searching.
  • the paging set has a priority
  • the second processing sub-module 122 in the mobile call center device performs the paging in the order of priority; after the first processing sub-module 121 divides the paging set, The second processing sub-module 122 pages in the highest allowed call delay time and in order of priority of the paging set from high to low, paging each cell in one paging set at a time, and First, the paging set including the high distribution probability is paged, if the paging succeeds, the paging is stopped; if the paging fails, the paging set of the medium distribution probability is paged, and so on, and finally the low distribution probability The paging set is paged. In this way, it is possible to ensure that the paging is successful within the maximum allowed call delay time and save the air interface resources.
  • the first processing sub-module 121 divides the paging set by using an average division and division according to a predetermined rule, and is respectively completed by the included first processing unit and/or the second processing unit, where the first processing The unit is configured to divide each cell in the a posteriori probability table into a plurality of paging sets having the same number of times as the maximum paging number according to an arrangement order of distribution probabilities;
  • the second processing unit is configured to divide each cell in the a posteriori probability table according to a predetermined rule
  • the predetermined rule includes:
  • the first processing unit and the second processing unit divide each cell in the a posteriori probability table into a plurality of paging sets according to different allocation principles, and the MSC performs optimized paging in units of paging sets.
  • the specific allocation principle can be seen.
  • the above method embodiments are not mentioned here.
  • the a posteriori probability table mentioned above may be generated by the second processing module 13 included in the MSC. Specifically, the second processing module 13 collects the distribution information of the target mobile terminal in each cell in a service state in a period, and according to the target.
  • the mobile terminal corresponds to the distribution information of each cell and the distribution information of all the cells corresponding to the location area, and obtains the distribution probability of the target mobile terminal in each cell in the location area in the service state, and then according to the identifier of each cell. And the corresponding distribution probability establishes a posterior probability table.
  • the generated posterior probability table may be maintained by the VLR or the HLR, and may of course be maintained by the MSC itself, for example, the a posteriori probability table is stored in the storage module 14 in the MSC for maintenance.
  • the mobile call center device provided in this embodiment performs paging based on the distribution probability of each user in the service state, so that the paging process is more concise and flexible, and the applicable scenario is wider; in the case of ensuring paging efficiency Next, it saves air resources.

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Description

移动终端寻呼方法和移动呼叫中心设备 本申请要求于 2009 年 6 月 29 日提交中国专利局、 申请号为 200910151038. 8 , 发明名称为 "移动终端寻呼方法和移动呼叫中心设备" 的中国专利申请的优先权, 其全部内容通过引用结合在本申请中。
技术领域
本发明实施例涉及无线通信技术领域, 尤其涉及一种移动终端寻呼方 法和移动呼叫中心设备。 背景技术
现代公众陆地移动通信网络以蜂窝架构为基 , 这种蜂窝架构为用户 实现移动通信。 此种架构中的核心技术为位置管理其包括两部分: 针对空 闲模式终端的位置跟踪, 以及针对传输模式下如何保证位置变化后的业务 连续性也称为切换技术。 现有主流的蜂窝通信系统如 2G、 3G等系统中, 一般均采用两级的位置管理方法。 构成位置管理的第一层是蜂窝小区 ( cell ), 第二层是位置区 (Location Area; 以下简称: LA ), 它是位置跟踪 的基 , 每个位置区 LA 由多个小区组成。 终端检查所在位置区是否发生 改变, 如果发生改变则主动将新的位置信息上 4艮给网络; 当呼叫到达时, 网络在终端最后一次报告的位置区所覆盖的所有小区内进行寻呼。
在实现本发明过程中, 发明人发现现有技术中至少存在如下问题: 在 现有的基于静态位置跟踪方法中, 当终端进入到一个新的位置区后便会做 位置更新, 但是当终端在该位置区中的各个小区之间移动时, 并不会上报 其新的位置信息, 因此网络仅能知道当前终端在哪个位置区中, 但并不知 道具体在哪个小区的覆盖下, 为了寻呼到终端, 一种现有技术需要在整个 位置区下发寻呼, 寻呼空口资源开销大。 另一种现有技术采用动态位置区 的管理方法针对单个终端进行优化, 由终端一直跟踪用户的移动轨迹, 不 论当前终端处于空闲态还是业务态, 终端一旦发现用户轨迹有变化就上报 给网络, 由网络优化位置区, 网络通过优化位置区来优化寻呼区, 这样将 造成网络实施和管理的复杂性, 而且由于终端需要频繁上报用户移动轨迹, 空口资源浪费依然严重。 发明内容
本发明实施例提供一种移动终端寻呼方法和移动呼叫中心设备, 用以 解决现有技术中网络实施复杂、 空口资源浪费严重等缺陷, 实现降低网络 实施的复杂性且节省空口资源。
本发明实施例提供一种移动终端寻呼方法, 包括:
接收业务呼叫请求, 并根据所述业务呼叫请求中包括的目标移动终端 的标识选择对应的后验概率表, 所述后验概率表包括所述目标移动终端处 于业务状态下在所属位置区内各个小区的分布概率;
根据所述分布概率选择小区对所述目标移动终端进行寻呼。
本发明实施例提供一种移动呼叫中心设备, 包括:
第一处理模块, 用于接收业务呼叫请求, 并根据所述业务呼叫请求中 包括的目标移动终端的标识选择对应的后验概率表, 所述后验概率表包括 所述目标移动终端处于业务状态下在所属位置区内各个小区的分布概率; 寻呼模块, 根据所述分布概率选择小区对所述目标移动终端进行寻呼。 本发明实施例提供的移动终端寻呼方法和移动呼叫中心设备, 基于用 户处于业务状态时在各小区中的分布概率进行寻呼, 寻呼过程更为简洁灵 活, 适用场景更为广泛, 在保证寻呼效率的情况下, 节约了空口资源。 附图说明
图 1为本发明实施例移动终端寻呼方法流程图;
图 2为本发明实施例应用移动终端寻呼方法的网络系统组成示意图; 图 3为本发明一实施例移动呼叫中心设备的结构示意图; 图 4为本发明另一实施例移动呼叫中心设备的结构示意图。
具体实施方式
下面结合附图和具体实施例进一步说明本发明实施例的技术方案。 本发明实施例通过对当前蜂窝网络的位置管理目的进行分析获知, 位 置管理的目的并非需要知道移动终端在什么时间出现在什么地点, 而是为 了呼叫到达时能快速准确地寻呼到该移动终端以使得其不错过业务。 因此 本发明实施例针对位置管理的目的提供一种解决方案, 即动态获得移动终 端的业务在各小区的分布概率, 并以此为基 来优化寻呼, 此种方式比跟 踪用户的移动轨迹更为简洁, 在保证寻呼效率的情况下, 节约空口资源, 而且更加灵活并且适用场景更为广泛。
本发明实施例提供一种移动终端寻呼方法, 包括接收业务呼叫请求, 并根据所述业务呼叫请求中包括的目标移动终端的标识选择对应的后验概 率表, 所述后验概率表包括所述目标移动终端处于业务状态下在所属位置 区内各个小区的分布概率, 然后根据所述分布概率选择小区对所述目标移 动终端进行寻呼。
具体地, 当移动呼叫中心接收到包括目标移动终端的标识的业务呼叫 请求后, 根据标识查找与该目标移动终端对应的后验概率表, 然后对目标 移动终端进行寻呼, 寻呼时具体可以按照分布概率从大到小进行顺序, 优 先地选择分布概率大的小区进行寻呼, 即按照分布概率从大到小地顺序进 行寻呼。
本实施例中, 后验概率表中包括目标移动终端在所属位置区内各个小 区的分布概率, 也就是说后验概率表包括了移动终端在位置区内所有小区 的分布概率信息, 移动终端没有到达过的小区的分布概率即为零, 本发明 各实施例中涉及的后验概率表中的各小区即为移动终端所属位置区内的所 有小区。
本实施例可以将后验概率表中的各小区划分成若干个寻呼集合, 并以 寻呼集合为单位进行寻呼。 当将后验概率表中的各小区划分到一个寻呼集 合中时, 寻呼即是对后验概率表中的所有小区进行寻呼; 当将后验概率表 中的每一个小区划分到一个寻呼集合中时, 寻呼即是每次寻呼一个小区; 当然, 也可以将后验概率表中的各小区划分到若干个优先级不同的寻呼集 合中进行寻呼, 优先将分布概率大的小区划分到高优先级的寻呼集合中, 而且寻呼时, 按照寻呼集合的优先级从高到低的顺序依次在寻呼集合所包 其中记录了该目标移动终端在所有时间处于业务状态下在各个小区的分布 概率, 当然也可以以时间段为单位建立多个后验概率表, 每个后验概率表 反映一个时间段内的分布概率, 这样可以使得寻呼更加准确。 以下以维护 对应于不同时间段的多个后验概率表为例进行详细说明。
图 1为本发明实施例移动终端寻呼方法流程图, 如图 1所示, 该方法包 括如下步骤:
步骤 100, 接收业务呼叫请求, 并根据所述业务呼叫请求中包括的目标 移动终端的标识和接收到所述业务呼叫请求的时间, 选择对应的后验概率 表, 所述后验概率表包括所述目标移动终端处于业务状态下在所属位置区 内各个小区的分布概率;
本实施例所述的后验概率表为移动呼叫中心维护的或者由其它网元维 护并可被移动呼叫中心调用的、 包括有一移动终端处于业务状态下在所属 位置区内各个小区的分布概率, 具体地说, 假设 Bi表示用户出现在小区 Ci 的事件, 用 A表示用户处于业务状态的事件, 则 P ( Bi )表示用户出现在小 区 Ci的概率, 而 P ( Bi|A )则表示用户处于业务状态时在小区 Ci中的分布概 率, 也称为后验概率。 现有方法主要是基于用户历史信息获得用户在各个 小区的分布信息, 如 P ( Bi ) , 然后基于这个分布信息进行寻呼; 而本发明 实施例是基于用户处于业务状态下在各个小区的相关信息, 获得用户在小 区中分布的后验概率 P ( Bi|A ) , 然后再考虑业务延迟要求的情况下基于最 大后验概率的准则, 优先在 P ( Bi|A )较大的小区内进行寻呼, 以优化寻呼。 当移动终端与网络建立业务期间, 网络统计终端在业务状态下所访问过的 小区中的信息; 经过一段时间的统计后, 才 据统计信息形成该移动终端处 于业务状态下在位置区中不同小区的分布概率 P ( Bi|A ) 。
而且后验概率表与时间段有关, 不同时间段对应有不同的后验概率表, 在进行优化寻呼时, 首先要确定用哪个时间段对应的后验概率表, 根据移 动终端在各个小区内的后验概率来优化寻呼, 提高寻呼效率。 当移动呼叫 中心接收到业务呼叫请求后, 首先确定接收到该业务呼叫请求的时间属于 哪个时间段, 并以此来选择与业务呼叫请求中携带的目标移动终端的标识 对应的后验概率表。
步骤 101,将所述后验概率表中的各个小区划分到数量与最大寻呼次数 相同的多个寻呼集合中, 所述寻呼集合根据所述分布概率按从大到小的顺 序获取, 所述最大寻呼次数根据所述业务呼叫请求最大允许的呼叫延迟时 间和每次寻呼时间获得;
在确定选用的后验概率表后, 由于该后验概率表中包括多个小区的后 验概率信息, 也就是说移动呼叫中心此次寻呼的范围为后验概率表中的所 有小区, 而且由于各个小区对应于不同的后验概率, 因此若需要提高寻呼 效率, 在寻呼延时允许的条件下, 则可以首先在后验概率较大的若干个小 区内进行寻呼, 由于其后验概率高, 因此寻呼成功率便相对高一些。 因此, 移动呼叫中心将各小区的分布概率按照从大到小的顺序进行排序; 然后, 将后验概率表中的各个小区划分到与最大寻呼次数数量相同的数个寻呼集 合中, 也就是优先将分布概率大的若干个小区分配到一个寻呼集合中, 将 分布概率中等的若干个小区分配到其他若干个寻呼集合中, 将分布概率最 低的若干个小区分配到再一个寻呼集合中, 这样位置区内所有小区均被按 照其对应的分布概率的大小, 被依次分配到若干个具有不同优先级的寻呼 集合中。 本实施例中, 建立的寻呼集合的数量可以与最大寻呼次数数量相 同, 所述最大寻呼次数是根据业务呼叫请求最大允许的呼叫延迟时间和每 次寻呼时间而获得的, 具体为呼叫延迟时间除以每次寻呼时间而获得。
步骤 102, 以所述寻呼集合为单位, 根据所述分布概率按从大到小的顺 序对所述目标移动终端进行寻呼。
移动呼叫中心将各小区分配到最大寻呼次数个寻呼集合中, 可以在最 大允许的呼叫延迟时间内, 分次进行寻呼, 每次寻呼一个寻呼集合中的所 有小区, 而且各寻呼集合具有优先级, 移动呼叫中心可以按照优先级从高 到低的顺序选择对应的寻呼集合进行寻呼, 具体可以是首先对包括高分布 概率的具有高优先级的寻呼集合进行寻呼, 若寻呼成功则停止寻呼; 若寻 呼失败, 则对中等分布概率的寻呼集合进行寻呼, 依次类推, 最后对低分 布概率的寻呼集合进行寻呼。 这样, 既可以尽量保证在最大允许的呼叫延 迟时间内寻呼成功, 又节省了空口资源, 寻呼效率也不会降低。 当然, 若 一业务的最大允许的呼叫延迟时间较长例如短信业务, 则可以分几次进行 寻呼, 若业务的最大允许的呼叫延迟时间很短例如紧急呼叫, 则可以将所 有小区均包含在一个寻呼集合中, 而且移动呼叫中心仅进行一次寻呼即对 后验概率表中所有的小区进行寻呼。
当新的业务到达时, 移动呼叫中心才 据本次业务时延要求计算出最多 能做几次寻呼, 移动呼叫中心根据移动终端业务状态下在各个小区的分布 概率和本次业务最大允许的寻呼次数决定采用一次或多次寻呼, 每次寻呼 选择终端业务状态下在各个小区的分布概率最大的一个或多个小区进行寻 呼, 直至寻呼成功。
本实施例提供的移动终端寻呼方法, 基于用户处于业务状态时在各小 区中的分布概率进行寻呼, 寻呼过程更为简洁灵活, 适用场景更为广泛, 而且在保证寻呼效率的情况下, 节约了空口资源。
以下介绍动态获得移动终端业务状态下在各小区分布概率的方法。 当移动终端与网络建立业务连接后, 网络便会获知当前处于业务状态 下移动终端相关信息, 因此可以采集到如业务所有小区信息, 以及业务在 这些小区中所经历的时长等信息, 另外网络也可以较容易采集到业务期间 终端在各个小区的移动速度等信息。 由于信息的采集、 保存和处理都会花 费一定的代价, 在考虑了代价和实用性后, 本实施例使用以下方法统计移 动终端业务状态下在各小区的分布信息,具体过程可以为网络侧首先统计一 个周期内处于业务状态下的目标移动终端在各小区的分布信息; 然后,根据目 标移动终端对应于每个小区的分布信息以及对应于位置区内所有小区的分 布信息之和, 获取目标移动终端处于业务状态下在所属位置区内各个小区 的分布概率。所述的分布信息可以包括目标移动终端在各小区对应的响应被 呼的次数、 发起主呼及响应被呼的次数或业务时长等, 以下分别对该三种 情况进行介绍。
一种方法是仅统计移动终端在各小区中响应呼叫的次数。 因为当前获 得移动终端在各小区分布概率的目的是为了在下一次被呼业务到达时对移 动终端进行寻呼并建立业务连接, 因此基于移动终端对业务的响应进行统 计是一个比较合理和简单的方法。
P ( Bi|A ) =统计时间内移动终端在小区 Ci的被叫次数除以统计时间内 移动终端在所有小区的总被叫次数。
另一种方法是既统计移动终端在各小区发起主呼的次数, 而且还统计 响应被呼的次数。 统计意义上主呼业务发生多的小区也是被呼业务发生多 的小区, 因此为了增加样本数, 可以既统计小区中主呼次数又统计被呼次 数, 基于主呼次数和被呼次数之和计算移动终端在各个小区的分布概率。 计算方法如下:
P ( Bi|A ) =统计时间内移动终端在小区 Ci的呼叫次数除以统计时间内 移动终端在所有小区的总呼叫次数, 其中呼叫次数 =主呼次数 +被呼次数。
再一种方法是统计业务在小区中所经过的时长, 以这个时长来计算移 动终端业务状态下在各个小区的分布概率。 P ( Bi|A ) =统计时间内移动终端在小区 Ci的总业务时长除以统计时间 内移动终端在所有小区的总业务时长。
网络侧例如移动呼叫中心在获得所需的分布概率后, 便可以根据各小 区的标识以及对应的分布概率建立后验概率表, 也就是说后验概率表中包 括有各小区的标识、 对应的分布概率, 也可以包括具体的数值例如在对应 小区进行业务的业务时长等。 本发明实施例就以方法三为基 进一步做阐 述网络内部数据保存和处理的方法。
关于获得移动终端业务状态下在各小区分布概率的统计周期分析, 统 计周期是获得一个稳定的后验概率 P ( Bi|A ) 的关键。 因为人的业务行为和 移动行为既不简单重复, 又非完全随机, 而是具有统计意义上的周期性, 因此合理地选择统计周期是保证及时稳定地获得后验概率的关键。 虽然可 以采用不同的统计周期, 但人们的生活中有几个重要的周期: 天, 星期。 大多数人的生活都以天和星期周期性重复的。 而且在一天中不同的人有不 同的关键时间段, 但对于绝大多数人而言白天和晚上是两个关键的时间段。 在一周内虽然不同的人有不同的生活和移动方式, 不过对大多数人而言一 周中工作日和休息日是两个重要的时段。 基于上述分析, 在考虑到简单性 和实用性后, 本实施例采用以下方法给出统计周期。
本实施例中将统计周期设置为一个星期, 考虑一个星期中不同天不同 时间段内大多数人的生活方式特点, 将针对一段周期内不同时间段分别统 计, 时间段划分如表 1所示。
Figure imgf000010_0001
统计周期 天类别 一天内不同时段划分 统计时段编号 Ts 一周 工作曰 白天 1
夜晚 2
休息曰 白天 3
夜晚 4 在一个统计周期内, 当移动终端与网络建立连接后, 网络判断应该选 择的统计时段, 然后针对这个统计时段内移动终端在所经过小区的业务时 长。 如当前业务发生在工作日的上午 10点, 网络选择的统计时段 Ts=l。 当 移动终端本次业务跨时间段时, 可以分别统计。
当一个统计周期结束后, 网络处理统计数据, 针对不同统计时段的数 据计算不同时段移动终端在各个小区中分布的后验概率。网络将统计周期划 分成至少一个时间段, 并建立与各时间段对应的后验概率表, 例如表 2为统计 时段 Ts=l所对应的表, 表中依据分布概率大小按从大到小进行了排列。
Figure imgf000011_0001
Figure imgf000011_0002
当移动终端初次进入一个位置区时, 尚未经历一个完整的统计周期, 获得稳定的后验概率信息, 此时依然可以基于已有的统计信息计算出所需 的概率, 基于概率信息进行寻呼, 不同的只是此时样本少, 统计概率的偏 差大一些。
在统计得到移动终端在小区中分布的后验概率 P ( Bi|A )后, 网络考虑 业务延迟要求在 P ( Bi|A )最大的一个或多个小区中逐次寻呼。 具体描述如 下: 假设 ^表示位置区包含的小区的总数; 假设一次寻呼在一个小区的空 口资源开销为 CP; 假设在一次业务中网络在位置区中发送了寻呼的相关所 有小区空口寻呼开销总和为 Ctoto ; 假设一次寻呼最大耗时为 假设业务的 最大允许的寻呼延迟时间为 , 最大允许的寻呼次数为 K。 则当需要发起寻呼时, 网络根据本次业务对时间的要求, 按照下式计 算出允许的最大寻呼次数 K = T—/TP。
然后网络依据表 1和当前业务发起时间确定时间段, 针对不同的时间段 选择相应的后验概率表作为进一步选择小区的基础, 例如当前呼叫对应的 时间为工作日上午 10时, 因此网络选择 Ts=l的表, 如表 2所示。
网络以当前允许的最大寻呼次数 为约束, 将位置区中的所有小区划 分为 个集合, 这 个集合分别表示如下: ..... Qj ,
S2 = {c21,….. C2.|,…… SK = {CKl,….. CKm) ; 网络首先根据后验概率从大到小顺 序将表中后验概率最大的 个小区放到集合 , 然后在位置区剩下小区中再 选择后验概率最大的■个小区放到集合 。在构成了 -1个集合后,将位置 区中最后剩余的小区放入集合 SK中。
按照网络发寻呼的优先级从高到低进行排列为: , ....... SK ,网络首先 在集合1 中进行寻呼, 如果终端响应寻呼, 则停止寻呼。 如果终端没有响 应, 则依次对集合1 ^到集合 的小区进行寻呼, 当中间接收到寻呼响应则 停止寻呼。
上述提出在最大寻呼次数 一定的情况, 将位置中的所有小区依据后 验概率 P ( Bi|A ) 的大小分为 个寻呼集合, 优先将后验概率大的的放到高 优先级寻呼集合中, 网络依据寻呼集合优先级从高到低的顺序逐次在各个 集合中寻呼直到终端响应为止。 对于每个集合中具体应该放几个小区, 以 下便进一步分析上述寻呼集合的划分方法, 划分的方法有很多种, 本实施 例提供以下两种划分方法, 当然并不局限于此。
一种划分方法是将所述后验概率表中的各个小区平均划分到与最大寻 呼次数数量相同的数个寻呼集合中, 即按小区个数等分, 这是一种最简单 的方法,每个集合中所包含的小区数7^ ^由下式给出: Nsc =l , 因此网络将 P( Bi|A )最大的 ^ ^个小区放入集合 ,然后再把接下来的 ^ ^个小区放入 ^, 直到将所有的小区都放到了 个寻呼集合中。
另一种划分方法是将后验概率表中的各个小区按照预定规则划分到与 最大寻呼次数数量相同的数个寻呼集合中, 其中所述的预定规则包括: 选 择包含小区个数最少的寻呼集合, 使得 ^, P2>Pt2, ......, ,其中, Pk 表示 个所述寻呼集合中的从第一个寻呼集合到第 A个寻呼集合所包括的 小区对应的所述分布概率之和, 表示第 k次寻呼成功概率门限值, k、 K为 正整数, 0<k≤K, 表示所述最大寻呼次数。
上述方法就是按设定的每次寻呼成功的累积概率门 P艮将小区分到 κ个 集合中, 具体地网络以最小化空口资源开销的原则给定寻呼成功概率门限 值 Ρ , 且有 ..... <PtK , 假设各个集合中所包含的小区个数为 nxr>n2..... nk",,nK ? 假设后验概率尸( '' 按照从大到小进行了排序, p(A 表 示后验概率最大, 即尸 (A I A) > P(B21 A) > "..P I A)….. > P{BN | A); 假设集合 从 , <S2, ...... Sk共 A个集合中所有小区的后验概率之和用 Pk表示, 因此有
Pk=P^+ ∑P{Bj \A), 且需要满足 Α〉 , 即前 Α个寻呼集合中所有小区的 j
后验概率和应该大于第 个门 P艮值 Ptk
因此可以用下面的公式描述网络在一次业务中的寻呼开销:
Ctotal =Cp{nx+n2{\-Px) + n {\-P2) + -…… + ¾(1- κ-\
= Cp(N-∑nMPk)
k=\
从上式看出, 如果给定门限值 ΡΛ, ) nk+x 数目越大越好, 即在门限给 定的情况下,在构成第 个寻呼集合时,选择的小区数量以满足 〉 门限 条件下 A最小时对应的小区个数,将尽量多的小区留给第 A + 1个集合。 因此 第 A个集合中的个数应满足下式: ¾ = Arg{MN((Pk_, + £ P(Bj A)) > Ptk)}
J 即网络在划分寻呼集合时,根据 Ρμ)从大到小依次将 ^放入当前集 合, 直到已放入当前集合 的小区概率和 μ)加上 ^^...Sw集合中
J 所有小区的后验概率概率和 大于 为止。 举例说明,
Figure imgf000014_0001
如果最大允许的寻呼次数为 2, 基于表 2给的数据, 假设寻呼成功概率门限 值 . = 0.6, 则在构成第一个寻呼集合1 ^时, 因为前两个小区的概率和等于 0.862才能大于该寻呼成功概率门 P艮值, 因此选择将小区索引号为 C1和 C2的 小区放入集合 * ^作为第一次寻呼的小区集合, 如果没有响应再在位置区的 剩余小区中进行寻呼。
上述实施例介绍了基于移动终端处于业务状态时在各小区中的分布概 率进行寻呼的方法, 并介绍了如何进行发布概率的统计和寻呼集合的划分 原则等内容, 以下本实施例结合图 2以一个具体的实施例介绍一下本发明实 施例移动终端寻呼方法的详细实现流程。 图 2为本发明实施例应用移动终端 寻呼方法的网络系统组成示意图, 图 2所示的是一个在当前蜂窝系统如全球 移动通信 (Global System For Mobile Communication; 以下简称: GSM)系统 中的一个实施例,如图 2所示,位置区 LA所包含的小区分别由第一基站( Base Station Sub-system; 以下简称: BSS )和第二 BSS两个接入网设备进行管理。 在本实施例中第一 BSS和第二 BSS都接到同一个移动交换中心 ( Mobile Switching Center; 以下简称: MSC ) , 因此 MSC负责管理终端在位置区 LA 的移动性, 即移动终端进入位置区 LA时, 它需要 MSC报告位置信息, 然后 MSC根据位置信息保存规则选择保存在访问用户位置寄存器 (Visiting Location Register; 以下简称: VLR )或者归属位置寄存器 (Home Location Register; 以下简称: HLR)中。 另外当有其他移动终端呼叫该移动终端时, MSC根据 VLR或 HLR保存的位置信息采用一定的寻呼策略在其所管辖的位 置区中进行寻呼。 采用本发明实施例提供的方法的描述如下: 一、 网络获得移动终端在位置区 LA中各小区的后验概率 P ( Bi|A )以及 保存相关信息:
( 1 )一移动终端 (以下简称: MS )初次进入位置区 LA时, MSC不能 获得 MS在位置区 LA中各小区的后验概率 P ( Bi|A ) , 因此如果此时 MSC需 要寻呼 MS就会直接在整个位置区的所有小区中下发寻呼消息;
( 2 )当 MS在小区 C13产生业务时, MS与第一 BSS之间建立了无线接入 连接, 因此第一 BSS知道当前 MS业务发生在小区 C13, 并且也知道 MS的这 次业务在 C13中发生的时长 tl3。因为业务期间第一 BSS与 MSC之间也建立连 接, 第一 BSS很容易将相关信息上报给 MSC;
( 3 )当 MS从 C13切换到 C21的过程中, 第一 BSS和第二 BSS之间要建立 联系, 第一 BSS可将所记录的 U3信息通过第一 BSS和 MSC之间的连接上报 给 MSC,或者第一 BSS将 tl3通过第一 BSS和第二 BSS之间的接口发送给第二 BSS, 由第二 BSS暂时保存, 当 MS在 C21中结束本次会话后, 第二 BSS将本 地记录的 t21(MS在小区 C21中的业务时长)以及 U3—起通过第二 BSS与 MSC 之间的接口发送给 MSC;
( 4 ) MSC统计 MS在位置区 LA的每次业务中在各个小区的会话时长, 形成了多个后验概率表, 本实施例以其中一个例如表 3为例进行说明, 表 3 是以周一到周五工作时段统计获得即 Ts=l 。 MSC可将表 3信息存储于 VLR 或 HLR中。
Figure imgf000015_0001
Figure imgf000015_0002
4 C18 500 0.128
5 C21 300 0.077
6 C22 100 0.026 当 MS从 MSC进入其他 MSC所管辖的位置区后, HLR会发消息通知 MSC, 此时 MSC可选择将 MS在位置区 LA中的后验概率表如表 3等保存到 MS所属的 VLR或 HLR中。因为 VLR或 HLR的保存信息的能力总是有限制的, 所以 VLR或 HLR可为 MS在不同位置区的后儉概率表设置一个老化时间, 若 在这个老化时间到达时该记录都没有被访问, 则可以删除该记录。
二、 网络利用位置分布表进行寻呼:
( 1 ) MS在位置区 LA中, 当另一移动终端在时段 Ts=1时呼叫该 MS, 则 MSC接收到呼叫建立消息时,首先从 VLR或 HLR中查询出 MS对应的后验概 率表如表 3所示, 查询可以依据 MS标识例如手机号码或者客户识别码 ( IMSI )等;
( 2 ) MSC检查当前呼叫业务所能容许的最大时长后, 计算出此业务最 多只能寻呼 2次。 另夕卜 MSC中已经设定, 两次寻呼的门限值为分别为 80%和 100%。 因此 MSC将位置区 LA的所有小区分为两个集合, 第一个集合包括 C17, C23, C16和 C18, 第二个集合包括位置区的其余小区。 MSC首先 在第一个集合中进行寻呼。 如果终端 MS响应寻呼, 则 MSC停止寻呼, 如果 终端 MS没有响应寻呼, 则 MSC在第二个集合中进行寻呼。
另外在上述步骤中, MSC在不同小区下发寻呼时, 需要首先将寻呼消息 下发给相应的 BSS, 由 BSS再在各个小区中下发寻呼。 由于现网中小区标 识符占用的字节数比较多,当 MSC指示 BSS在多个小区中下发寻呼消息时, 需要在 MSC和 BSS之间的接口中携带多个小区标识符。为了节省传输带宽, MSC和 BSS之间可以给不同的小区分配一个比特(Bit )位, 用映射图来指 示是否需要在相应的小区下发寻呼消息。 例如在本实施例中, 第一 BSS下 有 10个小区, 则用 10个比特就可以指示这 10个小区是否需要下发寻呼, 因 此用两个字节就可以表示了。 如果从低到高标识 C10到 C19, 无小区对应的 位置为零, 如表 4所示。
表 4
Figure imgf000017_0001
因此 MSC指示第一 BSS1在 C17, C16和 C18下发寻呼时, MSC会将把 表四中对应的第 6, 第 7, 第 8位置为 1, 其它位置为 0, 用 16进制表达为 01 C0H。 对于指示第二 BSS的情况此处不再赘述。
上述各实施例提供的移动终端寻呼方法, 基于用户处于业务状态时在 各小区中的分布概率进行寻呼, 寻呼过程更为简洁灵活, 适用场景更为广 泛, 而且在保证寻呼效率的情况下, 节约了空口资源。
本领域普通技术人员可以理解: 实现上述方法实施例的全部或部分步 骤可以通过程序指令相关的硬件来完成, 前述的程序可以存储于一计算机 可读取存储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 而前述的存储介质包括: ROM、 RAM, 磁碟或者光盘等各种可以存储程序 代码的介质。
图 3为本发明一实施例移动呼叫中心的结构示意图, 如图 3所示, 该移 动呼叫中心设备包括第一处理模块 1 1和寻呼模块 12, 其中第一处理模块 1 1 用于接收业务呼叫请求, 并根据该业务呼叫请求中包括的目标移动终端的 标识选择对应的后验概率表, 所述的后验概率表包括目标移动终端处于业 务状态下在所属位置区内各个小区的分布概率; 寻呼模块 12用于根据所述 分布概率选择小区对所述目标移动终端进行寻呼。
本实施例提供的移动呼叫中心设备可以为 MSC, 本实施例以 MSC为例 进行说明。 MSC中的第一处理模块 1 1接收到新的业务呼叫请求后, 从业务 呼叫请求中获取目标移动终端的标识, 然后根据该标识获取对应的后验概 率表, 该后验概率表中包括了该移动终端处于业务状态下在内各个小区的 分布概率情况; 第一处理模块 11获取到用于寻呼的后验概率表后, 由寻呼 模块 12负责根据该后验概率表对目标移动终端进行寻呼。 具体可以是将限 定的后验概率表中包括的所有小区对应的发布概率按照大小进行排序, 然 后优先选择分布概率大的小区进行寻呼, 即按照分布概率从大到小地顺序 进行寻呼。
本实施例中, 后验概率表可以仅为一张表, 其中记录了该目标移动终 端在所有时间处于业务状态下在各个小区的分布概率, 当然也可以以时间 段为单位建立多个后验概率表, 每个后验概率表反映一个时间段内的分布 概率, 这样可以使得寻呼更加准确。 当所维护的为多个后验概率表时, 则 第一处理模块 11还用于根据业务呼叫请求中包括的目标移动终端的标识和 接收到所述业务呼叫请求的时间, 选择对应的后验概率表。 第一处理模块 11在接收到业务呼叫请求后, 首先确定接收时间, 然后才 据时间和标识选 择对应的后验概率表进行寻呼。
本实施例提供的移动呼叫中心设备, 基于用户处于业务状态时在各小 区中的分布概率进行寻呼, 寻呼过程更为简洁灵活, 适用场景更为广泛, 而且在保证寻呼效率的情况下, 节约了空口资源。
图 4为本发明另一实施例移动呼叫中心设备的结构示意图,如图 4所示, 该移动呼叫中心设备包括第一处理模块 1 1和寻呼模块 12, 其中寻呼模块 12 包括第一处理子模块 121和第二处理子模块 122, 第一处理子模块 121用于 将所述后验概率表中的各个小区划分到数量与最大寻呼次数相同的多个寻 呼集合中, 所述寻呼集合根据所述分布概率按从大到小的顺序获取, 所述 最大寻呼次数根据所述业务呼叫请求最大允许的呼叫延迟时间和每次寻呼 时间获得; 第二处理子模块 122用于以寻呼集合为单位, 根据所述分布概率 按从大到小的顺序对所述目标移动终端进行寻呼。
具体地, 第一处理子模块 121将多个小区划分在数个寻呼集合中, 寻呼 集合的数量与最大寻呼次数数量相同, 而且优先将分布概率大的小区划分 到优先级高的寻呼集合中, 寻呼集合具有优先级, 移动呼叫中心设备中的 第二处理子模块 122进行寻呼时时按照优先级的高低顺序进行的;第一处理 子模块 121划分完寻呼集合后, 由第二处理子模块 122在最大允许的呼叫延 迟时间内, 分次并按照寻呼集合的优先级从高到低的顺序进行寻呼, 每次 寻呼一个寻呼集合中的所有小区, 而且是首先对包括高分布概率的寻呼集 合进行寻呼, 若寻呼成功则停止寻呼; 若寻呼失败, 则对中等分布概率的 寻呼集合进行寻呼, 依次类推, 最后对低分布概率的寻呼集合进行寻呼。 这样, 既可以尽量保证在最大允许的呼叫延迟时间内寻呼成功, 而且节省 了空口资源。
本实施例中第一处理子模块 121划分寻呼集合可以采用平均划分和按 照预定规则划分等划分, 并分别由所包括的第一处理单元和 /或第二处理单 元完成, 其中, 第一处理单元用于按照分布概率从大到小的排列顺序, 将 后验概率表中的各个小区平均划分到数量与最大寻呼次数相同的多个寻呼集 合中;
第二处理单元用于将所述后验概率表中的各个小区按照预定规则划分 到所述寻呼集合中, 所述预定规则包括:
选择包含小区个数最少的寻呼集合, 使得 P2 > Pt2 , ......, PK > PtK , 其中, A表示 个所述寻呼集合中的从第一个寻呼集合到第 A个寻呼集合所 包括的小区对应的所述分布概率之和, ptk表示第 k次寻呼成功概率门 P艮值, k、 为正整数, o < k≤K , 表示所述最大寻呼次数。
第一处理单元和第二处理单元按照不同的分配原则将后验概率表中的 各个小区划分成若干个寻呼集合, 并且 MSC以寻呼集合为单位进行优化寻 呼, 具体的分配原则可以参见上述方法实施例, 此处不再赞述。 上述涉及 的后验概率表可以由 MSC中包括的第二处理模块 13生成, 具体地, 第二处 理模块 13统计一个周期内处于业务状态下的目标移动终端在各小区的分布信 息, 并根据目标移动终端对应于每个小区的分布信息以及对应于位置区内 所有小区的分布信息之和, 获取目标移动终端处于业务状态下在所属位置 区内各个小区的分布概率, 再才 据各小区的标识以及对应的分布概率建立 后验概率表。生成的后验概率表可以由 VLR或 HLR维护,当然也可以由 MSC 自身维护, 例如将后验概率表存储在 MSC中的存储模块 14中进行维护。
本实施例提供的移动呼叫中心设备, 基于用户处于业务状态时在各小 区中的分布概率进行寻呼, 使得寻呼过程更为简洁灵活, 而且适用场景更 为广泛; 在保证寻呼效率的情况下, 节约了空口资源。 最后应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对 其限制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通 技术人员应当理解: 其依然可以对前述各实施例所记载的技术方案进行修 改, 或者对其中部分技术特征进行等同替换; 而这些修改或者替换, 并不 使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权利要求
1、 一种移动终端寻呼方法, 其特征在于, 包括:
接收业务呼叫请求, 并根据所述业务呼叫请求中包括的目标移动终端 的标识选择对应的后验概率表, 所述后验概率表包括所述目标移动终端处 于业务状态下在所属位置区内各个小区的分布概率;
根据所述分布概率选择小区对所述目标移动终端进行寻呼。
2、 根据权利要求 1所述的移动终端寻呼方法, 其特征在于, 所述根据 所述分布概率选择小区对所述目标移动终端进行寻呼包括:
将所述后验概率表中的各个小区划分到数量与最大寻呼次数相同的多 个寻呼集合中, 所述寻呼集合根据所述分布概率按从大到小的顺序获取, 所述最大寻呼次数根据所述业务呼叫请求最大允许的呼叫延迟时间和每次 寻呼时间获得;
以所述寻呼集合为单位, 根据所述分布概率按从大到小的顺序对所述 目标移动终端进行寻呼。
3、 根据权利要求 2所述的移动终端寻呼方法, 其特征在于, 所述将所 述后验概率表中的各个小区划分到数量与最大寻呼次数相同的多个寻呼集合 中, 包括:
将所述后验概率表中的各个小区按照预定规则划分到所述寻呼集合 中, 所述预定规则包括:
选择包含小区个数最少的寻呼集合, 使得 P2 > Pt2 , ......, PK > PtK , 其中, A表示 个所述寻呼集合中的从第一个寻呼集合到第 A个寻呼集合所 包括的小区对应的所述分布概率之和, Ptk表示第 k次寻呼成功概率门 P艮值, k、 为正整数, o < k≤K , 表示所述最大寻呼次数。
4、 根据权利要求 2所述的移动终端寻呼方法, 其特征在于, 所述将所 述后验概率表中的各个小区划分到数量与最大寻呼次数相同的多个寻呼集合 中, 包括: 将所述后验概率表中的各个小区平均划分到所述寻呼集合中。
5、 根据权利要求 1所述的移动终端寻呼方法, 其特征在于, 所述根据 所述业务呼叫请求中包括的目标移动终端的标识选择对应的后验概率表包 括:
根据所述业务呼叫请求中包括的目标移动终端的标识和接收到所述业 务呼叫请求的时间, 选择对应的后验概率表。
6、 根据权利要求 1或 5所述的移动终端寻呼方法, 其特征在于, 在所述 接收业务呼叫请求之前, 所述方法还包括:
统计一个周期内处于业务状态下的所述目标移动终端在各小区的分布信 根据所述目标移动终端对应于每个小区的分布信息以及对应于所述位 置区内所有所述小区的分布信息之和, 获取所述目标移动终端处于业务状 态下在所属位置区内各个小区的分布概率。
7、 根据权利要求 6所述的移动终端寻呼方法, 其特征在于, 所述分布 信息包括所述目标移动终端在各小区对应的响应被呼的次数, 或发起主呼 及响应被呼的次数之和, 或业务时长。
8、 根据权利要求 5所述的移动终端寻呼方法, 其特征在于, 所述方法还包 括:
将所述周期划分成至少一个时间段, 并建立与各时间段对应的后验概率 表。
9、 一种移动呼叫中心设备, 其特征在于, 包括:
第一处理模块, 用于接收业务呼叫请求, 并根据所述业务呼叫请求中 包括的目标移动终端的标识选择对应的后验概率表, 所述后验概率表包括 所述目标移动终端处于业务状态下在所属位置区内各个小区的分布概率; 寻呼模块, 用于根据所述分布概率选择小区对所述目标移动终端进行寻 呼。
10、 根据权利要求 9所述的移动呼叫中心设备, 其特征在于, 所述寻呼 模块包括:
第一处理子模块, 用于将所述后验概率表中的各个小区划分到数量与 最大寻呼次数相同的多个寻呼集合中, 所述寻呼集合根据所述分布概率按 从大到小的顺序获取, 所述最大寻呼次数根据所述业务呼叫请求最大允许 的呼叫延迟时间和每次寻呼时间获得;
第二处理子模块, 用于以所述寻呼集合为单位, 根据所述分布概率按 从大到小的顺序对所述目标移动终端进行寻呼。
1 1、 根据权利要求 10所述的移动呼叫中心设备, 其特征在于, 所述第 一处理子模块包括第一处理单元和 /或第二处理单元, 其中:
所述第一处理单元, 用于将所述后验概率表中的各个小区平均划分到 所述寻呼集合中;
所述第二处理单元, 用于将所述后验概率表中的各个小区按照预定规 则划分到所述寻呼集合中, 所述预定规则包括:
选择包含小区个数最少的寻呼集合, 使得 P2 > Pt2 , ......, PK > PtK , 其中, A表示 个所述寻呼集合中的从第一个寻呼集合到第 A个寻呼集合所 包括的小区对应的所述分布概率之和, ptk表示第 k次寻呼成功概率门 P艮值, k、 为正整数, o < k≤K , 表示所述最大寻呼次数。
12、 根据权利要求 9所述的移动呼叫中心设备, 其特征在于, 所述第一 处理模块还用于: 根据所述业务呼叫请求中包括的目标移动终端的标识和 接收到所述业务呼叫请求的时间, 选择对应的后验概率表。
13、 根据权利要求 9至 12任一所述的移动呼叫中心设备, 其特征在于, 还包括:
第二处理模块, 用于统计一个周期内处于业务状态下的所述目标移动终 端在各小区的分布信息, 并根据所述目标移动终端对应于每个小区的分布信 息以及对应于所述位置区内所有所述小区的分布信息之和, 获取所述目标 移动终端处于业务状态下在所属位置区内各个小区的分布概率, 再根据各 小区的标识以及对应的所述分布概率建立所述后验概率表。
14、 根据权利要求 9至 12任一所述的移动呼叫中心设备, 其特征在于, 还包括:
存储模块, 用于存储所述后验概率表。
PCT/CN2010/073969 2009-06-29 2010-06-13 移动终端寻呼方法和移动呼叫中心设备 WO2011000261A1 (zh)

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