Abstract:
Disclosed is a method for mobility management of group terminals, where a mobility management platform sends a request for calling a service to a terminal of a group, and determines a terminal responding to the request for calling the service as a service center of the service; and the service center of the service configures a terminal environment according to the request for calling the service to which the service center of the service responds, and uploads information on the configured terminal environment to the mobility management platform. Also disclosed are a system and equipments for mobility management of group terminals. With a solution of the disclosure, in the case of multiple services, it is possible to select, from different terminals, a terminal as a service center according to the service, thereby avoiding a ping-pong effect, increasing utilization efficiency of network resources, enhancing optimal user experience of QoS, and meeting a management requirement in parallel transmission of multiple service flows in a ubiquitous network.

Description:
TECHNICAL FIELD 
       [0001]    The present disclosure relates to technology of mobility management of group terminals, and in an embodiment to a method, system, and equipments for mobility management of group terminals based on multiple services and multiple centers. 
       BACKGROUND 
       [0002]    With the ongoing development of network communication technology, there are increasing user demands for better network Quality-of-Service and service experience. Particularly, under the circumstance of a ubiquitous network, when there are numerous mobile terminal equipments around a user, it is required to effectively manage the mobile terminal equipments for improving efficiency of collaboration among the terminals and continuity of a ubiquitous service and providing the user with optimal experience of quality of service (QoS). However, an existing method for mobility management of group terminals fails to provide any effective solution for collaborative use of network resources among heterogeneous wireless networks when multiple service flows are transmitted in parallel in a ubiquitous network, and also fails to provide any effective measure for handling a situation such as service interruption due to single-point failure, a network coverage issue and the like in large-scale movement of a large number of nodes in a physical space and a heterogeneous-network space, thereby affecting service continuity and reducing user experience of QoS. 
         [0003]    A preferred method for mobility management of group terminals with a single center is proposed in a patent document titled “Method, system and terminal for temporary group management based on terminal cooperation” (Chinese Patent Application No. 201010290185.6, Publication No. CN101951557A), where according to a cooperation request of a terminal, a management platform sets the terminal sending the cooperation request as a temporary manager of a group to manage a large number of nodes in the group, reducing dependence of group management on an external device and improving efficiency in executing a terminal cooperation service. However, with this method, when single-point failure occurs due to damage to the temporary manager of the group or a network coverage issue, and the like, the mobility management of group terminals will crash; meanwhile, in a scenario such as parallel transmission of multiple service flows in a ubiquitous network, due to limited capability per se, the temporary manager of the group cannot achieve efficient collaboration among the nodes in the group between multiple services and multiple access networks, and cannot meet a management requirement in parallel transmission of multiple service flows in the ubiquitous network, thereby reducing user experience of QoS. 
       SUMMARY 
       [0004]    In view of this, it is desired that embodiments of the disclosure provide a method, system and equipments for mobility management of group terminals, capable of increasing utilization efficiency of network resources, meeting a management requirement in parallel transmission of multiple service flows in a ubiquitous network, and providing a solution for service interruption due to single-point failure. 
         [0005]    To this end, a technical solution of the disclosure is implemented as follows. 
         [0006]    The disclosure provides a method for mobility management of group terminals, including steps of: 
         [0007]    sending, by a mobility management platform, a request for calling a service to a terminal of a group, and determining a terminal responding to the request for calling the service as a service center of the service; and 
         [0008]    configuring, by the service center of the service, a terminal environment according to the request for calling the service to which the service center of the service responds, and uploading information on the configured terminal environment to the mobility management platform. 
         [0009]    In an embodiment, the step of determining a terminal responding to the request for calling the service as a service center of the service may be: generating, by the mobility management platform, a weighted terminal-ranking list of any terminal responding to the request for calling the service via an analytic hierarchy process; sending a service-center authenticating message to a terminal with a maximal weight in the weighted terminal-ranking list; and after receiving an approving message returned by the terminal with the maximal weight in the weighted terminal-ranking list, informing a terminal responding to the request for calling the service other than the service center of the determination of the terminal with the maximal weight in the weighted terminal-ranking list as the service center. 
         [0010]    In an embodiment, the request for calling the service may include a type of the service and a priority of the service; and 
         [0011]    a terminal may respond to the received request for calling the service when it is determined that a capability of the terminal matches the type of the service and the terminal is in an idle state, or when it is determined that a capability of the terminal matches the type of the service, the terminal is in an operating state, and the requested service has a high priority. 
         [0012]    In an embodiment, the service-center authenticating message may include a service-center-replacement triggering condition. 
         [0013]    In an embodiment, the method may further include steps of: when the service center meets the service-center-replacement triggering condition, sending, by the service center, a service-center-replacement application to the mobility management platform, and after receiving application-approved information sent by the mobility management platform, selecting a service center other than the service center itself as a temporary service center; after the mobility management platform determines a new service center according to the weighted terminal-ranking list, replacing, by the new service center, the temporary service center in configuring the terminal environment and uploading the information on the configured terminal environment to the mobility management platform. 
         [0014]    In an embodiment, the method may further include steps of: after receiving a request for the service, extracting, by the mobility management platform, information on a type of the service and a priority of the service in the request for the service, collecting a communication parameter of a wireless network, assigning a weight to the communication parameter, and allocating a wireless network resource for the service based on fuzzy logics and neural network technology. 
         [0015]    In an embodiment, the step of allocating a wireless network resource for the service based on fuzzy logics and neural network technology may be: acquiring a network-access-decision parameter by performing network-access calculation on the collected communication parameter based on a particle-swarm-optimization fuzzy neuron, and allocating the wireless network resource for the requested service according to the network-access-decision parameter. 
         [0016]    In an embodiment, service centers may transmit service flows in parallel. 
         [0017]    A system for mobility management of group terminals provided in the disclosure includes a mobility management platform and a service center, wherein 
         [0018]    the mobility management platform is configured for: sending a request for calling a service to a terminal of a group, and determining a terminal that responds to the request for calling the service as the service center of the service; and 
         [0019]    the service center is configured for: configuring a terminal environment according to the request for calling the service to which the service center responds, and uploading information on the configured terminal environment to the mobility management platform. 
         [0020]    In an embodiment, the mobility management platform may include 
         [0021]    a service management module configured for: sending the request for calling the service to a terminal of the group, and determining a terminal that responds to the request for calling the service as the service center of the service. 
         [0022]    In an embodiment, the mobility management platform may include 
         [0023]    a wireless-channel allocating module configured for: after receiving a request for the service, extracting information on a type of the service and a priority of the service in the request for the service, collecting a communication parameter of a wireless network, assigning a weight to the communication parameter, and allocating a wireless network resource for the service based on fuzzy logics and neural network technology. 
         [0024]    In an embodiment, the mobility management platform may include 
         [0025]    a node managing module configured for: after receiving a service-center-replacement application sent by the service center, returning application-approved information, determining a new service center according to a weighted terminal-ranking list, and sending a service flow according to the information on the terminal environment uploaded by the new service center. 
         [0026]    In an embodiment, the service center may include a service responding module and an environment configuring module, wherein 
         [0027]    the service responding module may be configured for: receiving and responding to the request for calling the service sent by the mobility management platform; and 
         [0028]    the environment configuring module may be configured for configuring the terminal environment according to the request for calling the service, and uploading information on the configured terminal environment to the mobility management platform. 
         [0029]    In an embodiment, the service responding module may specifically be configured for: after receiving the request for calling the service sent by the mobility management platform, responding to the request for calling the service when it is determined that a capability of the terminal matches a type of the service and the terminal is in an idle state, or when it is determined that a capability of the terminal matches a type of the service, the terminal is in an operating state, and the requested service has a high priority. 
         [0030]    In an embodiment, the service center may include a single-point-failure handling module configured for: when the service center meets a service-center-replacement triggering condition, sending a service-center-replacement application to the mobility management platform, and after receiving application-approved information sent by the mobility management platform, selecting a service center other than the local service center as a temporary service center. 
         [0031]    A mobility management platform provided in the disclosure includes 
         [0032]    a service management module configured for: sending a request for calling a service to a terminal of a group, and determining a terminal that responds to the request for calling the service as a service center of the service. 
         [0033]    A service center provided in the disclosure specifically includes: 
         [0034]    a service responding module configured for receiving and responding to a request for calling a service sent by a mobility management platform; and 
         [0035]    an environment configuring module configured for configuring a terminal environment according to the request for calling the service, and uploading information on the configured terminal environment to the mobility management platform. 
         [0036]    The present disclosure provides a method, system and equipments for mobility management of group terminals, where a mobility management platform sends a request for calling a service to a terminal of a group, and determines a terminal responding to the request for calling the service as a service center of the service; and the service center of the service configures a terminal environment according to the request for calling the service to which the service center of the service responds, and uploads information on the configured terminal environment to the mobility management platform. In this way, in the case of multiple services, it is possible for a mobility management platform to select, from different terminals, a terminal as a service center according to the service, thereby avoiding a ping-pong effect, increasing utilization efficiency of network resources, enhancing optimal user experience of QoS, and meeting a management requirement in parallel transmission of multiple service flows in a ubiquitous network. In addition, when a single-point failure occurs at a service center, the mobility management platform automatically selects a terminal under the management of the service center as a new service center, avoiding service interruption caused by a single-point failure, improving reliability and continuity during service flow execution. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0037]      FIG. 1  is a flow chart of a method for mobility management of group terminals based on multiple services and multiple centers implemented according to the disclosure; 
           [0038]      FIG. 2  is a diagram of generating a weighted terminal-ranking list via an analytic hierarchy process in an embodiment of the disclosure; 
           [0039]      FIG. 3  is a flow chart of service-center replacement in an embodiment of the disclosure; and 
           [0040]      FIG. 4  is a diagram of a structure of a system for mobility management of group terminals based on multiple services and multiple centers implemented according to the disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0041]    According to embodiments of the disclosure, a mobility management platform sends a request for calling a service to a terminal of a group, and determines a terminal responding to the request for calling the service as a service center of the service; and the service center of the service configures a terminal environment according to the request for calling the service to which the service center of the service responds, and uploads information on the configured terminal environment to the mobility management platform. 
         [0042]    The disclosure is further elaborated below with reference to accompanying drawings and specific embodiments. 
         [0043]    A method for mobility management of group terminals based on multiple services and multiple centers is implemented in the disclosure. As shown in  FIG. 1 , the method may include steps as follows. 
         [0044]    In step  101 , a mobility management platform sends a request for calling a service to a terminal of a group, and determines a terminal responding to the request for calling the service as a service center of the service. 
         [0045]    In an embodiment, after receiving requests for various services, the mobility management platform sends the request for calling a service to each terminal in the group. A terminal receiving the request for calling the service determines whether to respond to the request for calling the service based on a service status per se and the request for calling the service, and sends, when the terminal determines to respond to the request for calling the service, a response to the request for calling the service to the mobility management platform. The mobility management platform generates a weighted terminal-ranking list of any terminal responding to the request for calling the service via an analytic hierarchy process; sends a service-center authenticating message to a terminal with a maximal weight in the weighted terminal-ranking list; and after receiving an approving message returned by the terminal with the maximal weight in the weighted terminal-ranking list, informs a terminal responding to the request for calling the service other than the service center of the determination of the terminal with the maximal weight in the weighted terminal-ranking list as the service center. A link is established between the service center and a terminal responding to the request for calling the service other than the service center to form a sub-group. 
         [0046]    Generally, a request for a service is sent by a user through a terminal. 
         [0047]    A request for calling a service may include a type of the service and a priority of the service, the type of the service including a video service, a voice service, a short message service, etc. 
         [0048]    A terminal receiving a request for calling a service may determine whether to respond to the request for calling the service by steps of 
         [0049]    A. determining whether a capability of the terminal matches the type of the service; refusing to respond to the request for calling the service if the capability of the terminal does not match the type of the service, or performing step B if they match; 
         [0050]    B. determining a state of the terminal; and responding to the received request for calling the service if the terminal is in an idle state, or performing step C if the terminal is in an operating state; 
         [0051]    C. responding to the received request for calling the service when the requested service has a high priority, or refusing to respond to the received request for calling the service when the requested service does not have a high priority. 
         [0052]    The mobility management platform may generate a weighted terminal-ranking list of any terminal responding to a same request for calling a service via an analytic hierarchy process specifically according to information on a parameter of capability of a terminal responding to the request for calling the service, including information on a terminal configuration, a moving rate, a service bandwidth, a delay requirement, and charge information, etc. The analytic hierarchy process, as shown in  FIG. 2 , may include three layers, i.e., a target layer, a criterion layer and a solution layer; the target layer may include a weighted terminal-ranking list; the criterion layer may include a criterion for analyzing the terminal configuration, the moving rate, the service bandwidth, the delay requirement, and the charge information; the solution layer may include any terminal responding to the same request for calling a service, such as Terminal 1, Terminal 2, and Terminal 3. In other words, the criterion layer may assign, to an aforementioned parameter, a weight corresponding to a task of the target layer; a terminal in the solution layer may also assign, to an aforementioned parameter, a weight corresponding to the capability of the terminal itself; finally, the weighted terminal-ranking list may be generated according to an algorithm relevant to the analytic hierarchy process according to both weights. Such an analytic hierarchy process is known in the art and will not be elaborated herein. 
         [0053]    The service-center authenticating message may include a service-center-replacement triggering condition. 
         [0054]    A service center may send a service-center-replacement application to the mobility management platform when a service-center-replacement triggering condition is met, where the service-center-replacement triggering condition may include: a power supply of the service center running lower than a set threshold; an index such as a network signal strength or a bandwidth being lower than a set threshold; the service center quitting a group due to a reason such as a space, a distance, or the like; the service center stopping operation due to a failure per se; and a change in a service going beyond the capability of the service center. 
         [0055]    Step  101  may further include steps as follows: after the mobility management platform receives a request for a service, information on a type of the service and a priority of the service included in the request for the service is extracted, a communication parameter of a wireless network such as a signal strength or a delay is collected, a weight is assigned to the communication parameter, and the mobility management platform allocates a wireless network resource for the requested service based on fuzzy logics and neural network technology. 
         [0056]    The mobility management platform may allocate a wireless network resource for the requested service based on fuzzy logics and neural network technology specifically by: acquiring a network-access-decision parameter by performing network-access calculation on the collected communication parameter based on a particle-swarm-optimization fuzzy neuron, and allocating the wireless network resource for the requested service according to the network-access-decision parameter. A specific example is described as follows. 
         [0057]    Take for example two heterogeneous wireless networks of 3G and Wifi, denoted by Network 1 and Network 2, respectively. X 1 , is defined as the difference between signal strengths of Network 1 and Network 2, X 2  is defined as the difference between delays of Network 1 and Network 2, and X 3  is defined as a matching degree between the type of a service and a network. Taking X 1 , X 2 , and X 3  as input parameters of a fuzzy neuron, a fuzzy decision factor F may be obtained: 
         [0000]    
       
         
           
             
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         [0000]    where K is a neuronal gain, w i  is a weighting coefficient corresponding to an input parameter X i . Allocation for network access is accomplished according to the value of the fuzzy decision factor F. When F&lt;1, Network 1 is accessed. When F&gt;1, Network 2 is accessed. When F=1, a network with a higher matching degree with the service is accessed. 
         [0058]    In step  102 , the service center of the service configures a terminal environment according to the request for calling the service to which the service center of the service responds, and uploads information on the configured terminal environment to the mobility management platform. 
         [0059]    In an embodiment, a service center configures, in response to a request for calling a service sent by the mobility management platform, the terminal environment required in performing the service and a strategy of service transmission by streams according to information on a parameter of capability of a terminal responding to the request for calling the service other than the service center itself, and uploads information on the configured terminal environment to the mobility management platform, the information on the configured terminal environment including the terminal environment required in performing the service and the strategy of service transmission by streams. 
         [0060]    The method may further include that: the mobility management platform sends a service flow to a terminal responding to the request for calling a service according to information on the terminal environment uploaded by the service center of the service. 
         [0061]    With the method, when multiple services are in progress, each service has a corresponding service center, and service centers may transmit service flows in parallel. For example, service centers may simultaneously perform operations such as data downloading. The method may also include that: when a single-point failure occurs at a service center, and the service center meets a service-center-replacement triggering condition, the service center sends a service-center-replacement application to the mobility management platform, and after receiving application-approved information sent by the mobility management platform, selects a service center other than the service center itself as a temporary service center; after the mobility management platform determines a new service center according to a weighted terminal-ranking list, the new service center replaces the temporary service center in configuring the terminal environment and uploading the information on the configured terminal environment to the mobility management platform. The mobility management platform sends a service flow according to the information on the terminal environment uploaded by the new service center. Specific steps are as shown in  FIG. 3 , included wherein are a terminal home server, a mobility management platform  10 , a service center  12 , a temporary service center  11 , a terminal  17 , a terminal  18 . 
         [0062]    Step  201 : when meeting a service-center-replacement triggering condition, a service center  12  sends a service-center-replacement application to a mobility management platform  10 . 
         [0063]    In this step, the service center  12  may send a service-center-replacement application to the mobility management platform  10  when meeting a service-center-replacement triggering condition, where the service-center-replacement triggering condition may include: 
         [0064]    a power supply of the service center  12  running lower than a set threshold; 
         [0065]    an index such as a network signal strength or a bandwidth being lower than a set threshold; 
         [0066]    the service center  12  quitting a group due to a reason such as a space, a distance, or the like; 
         [0067]    the service center  12  stopping operation due to a failure per se; and 
         [0068]    a change in a service going beyond the capability of the service center  12 . 
         [0069]    Step  202 : after receiving the service-center-replacement application, the mobility management platform  10  approves the application, and sends application-approved information to the service center  12 . 
         [0070]    Step  203 : the service center  12  selects a service center  11  other than the service center  12  itself as a temporary service center, and sends information on a service state of the service center  12  to the temporary service center  11 . 
         [0071]    In this step, the service center  12  selects a service center other than the service center  12  itself as a temporary service center  11 , sends information on the service state per se to the temporary service center  11 , and informs the terminal  17 , the terminal  18  to establish a temporary link with the temporary service center  11 . The temporary service center  11  continues a service according to the information on the service state. The temporary service center  11  may be selected according to a type of the service, information on a parameter of terminal capability, and a communication cost. 
         [0072]    Step  204 : the terminal  17 , the terminal  18  establishes a temporary link respectively with the temporary service center  11 . 
         [0073]    Step  205 : after looking up a weighted terminal-ranking list, the mobility management platform  10  sends a service-center authenticating message to the terminal  18  with a weight second to that of the original service center in the weighted terminal-ranking list. 
         [0074]    Step  206 : after receiving and approving the service-center authenticating message, the terminal  18  returns an approving message to the mobility management platform  10 . 
         [0075]    Step  207 : after receiving the approving message, the mobility management platform  10  informs the terminal  17  and the temporary service center  11  of the determination of terminal  18  as a new service center. 
         [0076]    Step  208 : a temporary link is established between the terminal  17  and the terminal  18  such that a sub-group is formed. 
         [0077]    Step  209 : the terminal  18  configures a terminal environment. 
         [0078]    In this step, the terminal  18  reconfigures, according to a request for calling a service sent by the mobility management platform  10 , the terminal environment required in performing the service and a strategy of service transmission by streams according to information on a parameter of capability of a terminal in the sub-group. 
         [0079]    Step  210 : the mobility management platform  10  sends a service transfer instruction to the temporary service center  11 , which then sends the information on a service state to the terminal  18   
         [0080]    In this step, the mobility management platform  10  sends the service transfer instruction to the temporary service center  11 , which then sends the information on the service state to the terminal  18  after verifying that the service transfer instruction is indeed sent by the mobility management platform  10 . 
         [0081]    Step  211 : the terminal  18  uploads information on the configured terminal environment to the mobility management platform  10 . 
         [0082]    In this step, information on the terminal environment may include the terminal environment required in performing the service and the strategy of service transmission by streams that are reconfigured. 
         [0083]    Step  212 : the mobility management platform  10  sends service flows to the terminal  17  and the terminal  18  according to information on terminal configuration uploaded by the terminal  18 . 
         [0084]    To implement the aforementioned method, a system for mobility management of group terminals based on multiple services and multiple centers is also provided by the disclosure. As shown in  FIG. 4 , the system includes a mobility management platform  41  and multiple service centers  42 . 
         [0085]    The mobility management platform  41  is configured for sending a request for calling a service to a terminal of a group, and determining a terminal that responds to the request for calling the service as a service center  42  of the service. 
         [0086]    A service center  42  is configured for: configuring a terminal environment according to a request for calling a service to which the service center responds, and uploading information on the configured terminal environment to the mobility management platform  41 . 
         [0087]    The mobility management platform  41  may specifically include a service management module  411  configured for: sending a request for calling a service to a terminal of a group, and determining a terminal that responds to the request for calling the service as the service center  42  of the service. 
         [0088]    The service management module  411  may specifically be configured for: after receiving requests for various services, sending a request for calling a service to each terminal in a group; generating a weighted terminal-ranking list of any terminal responding to the same request for calling a service via an analytic hierarchy process; sending a service-center authenticating message to a terminal with a maximal weight in the weighted terminal-ranking list; and after receiving an approving message returned by the terminal with the maximal weight in the weighted terminal-ranking list, informing a terminal responding to the same request for calling the service other than the service center  42  of the determination of the terminal with the maximal weight in the weighted terminal-ranking list as the service center  42 . 
         [0089]    The mobility management platform  41  may further include a wireless-channel allocating module  413  configured for: after receiving a request for a service, extracting information on a type of the service and a priority of the service in the request for the service, collecting a communication parameter of a wireless network such as a signal strength or a delay, assigning a weight to the communication parameter, and allocating a wireless network resource for the requested service based on fuzzy logics and neural network technology. 
         [0090]    The mobility management platform  41  may further include a node managing module  414  configured for: after receiving a service-center-replacement application sent by the service center  42 , returning application-approved information, determining a new service center according to a weighted terminal-ranking list, and sending a service flow according to information on a terminal environment uploaded by the new service center. 
         [0091]    The mobility management platform  41  may further include a service sending module  412  configured for sending a service flow to a terminal responding to a request for calling a service according to information on a terminal environment uploaded by a service center  42 . 
         [0092]    A service center  42  may include a service responding module  421  and an environment configuring module  422 . 
         [0093]    The service responding module  421  may be configured for receiving and responding to a request for calling a service sent by the mobility management platform  41 . 
         [0094]    The environment configuring module  422  may be configured for configuring a terminal environment according to a request for calling a service, and uploading information on the configured terminal environment to the mobility management platform  41 . 
         [0095]    The service responding module  421  may specifically be configured for: after receiving a request for calling a service sent by the mobility management platform  41 , responding to the request for calling the service when it is determined that a capability of the terminal matches a type of the service and the terminal is in an idle state, or when it is determined that a capability of the terminal matches a type of the service, the terminal is in an operating state, and the requested service has a high priority. 
         [0096]    The service center  42  may further include a single-point-failure handling module  423  configured for: when the service center meets a service-center-replacement triggering condition, sending a service-center-replacement application to the mobility management platform  41 , and after receiving application-approved information sent by the mobility management platform, selecting a service center other than the local service center as a temporary service center. 
         [0097]    Based on the above system, a mobility management platform is also provided by the disclosure. As shown in  FIG. 4 , the mobility management platform  41  includes 
         [0098]    a service management module  411  configured for: sending a request for calling a service to a terminal of a group, and determining a terminal that responds to the request for calling the service as a service center  42  of the service. 
         [0099]    The service management module  411  may specifically be configured for: after receiving requests for various services, sending a request for calling a service to each terminal in a group; generating a weighted terminal-ranking list of any terminal responding to the same request for calling a service via an analytic hierarchy process; sending a service-center authenticating message to a terminal with a maximal weight in the weighted terminal-ranking list; and after receiving an approving message returned by the terminal with the maximal weight in the weighted terminal-ranking list, informing a terminal responding to the same request for calling the service other than the service center  42  of the determination of the terminal with the maximal weight in the weighted terminal-ranking list as the service center  42 . 
         [0100]    The mobility management platform  41  may further include a wireless-channel allocating module  413  configured for: after receiving a request for a service, extracting information on a type of the service and a priority of the service in the request for the service, collecting a communication parameter of a wireless network such as a signal strength or a delay, assigning a weight to the communication parameter, and allocating a wireless network resource for the requested service based on fuzzy logics and neural network technology. 
         [0101]    The mobility management platform  41  may further include a node managing module  414  configured for: after receiving a service-center-replacement application sent by the service center  42 , returning application-approved information, determining a new service center according to a weighted terminal-ranking list, and sending a service flow according to information on a terminal environment uploaded by the new service center. 
         [0102]    The mobility management platform  41  may further include a service sending module  412  configured for sending a service flow to a terminal responding to a request for calling a service according to information on a terminal environment uploaded by a service center  42 . 
         [0103]    Based on the above system, a service center is also provided by the disclosure. As shown in  FIG. 4 , the service center  42  includes: 
         [0104]    a service responding module  421  configured for receiving and responding to a request for calling a service sent by the mobility management platform  41 ; and 
         [0105]    an environment configuring module  422  configured for configuring a terminal environment according to a request for calling a service, and uploading information on the configured terminal environment to the mobility management platform  41 . 
         [0106]    The service responding module  421  may specifically be configured for: after receiving a request for calling a service sent by the mobility management platform  41 , responding to the request for calling the service when it is determined that a capability of the terminal matches a type of the service and the terminal is in an idle state, or when it is determined that a capability of the terminal matches a type of the service, the terminal is in an operating state, and the requested service has a high priority. 
         [0107]    The service center  42  may further include a single-point-failure handling module  423  configured for: when the service center meets a service-center-replacement triggering condition, sending a service-center-replacement application to the mobility management platform  41 , and after receiving application-approved information sent by the mobility management platform, selecting a service center other than the local service center as a temporary service center. 
         [0108]    An embodiment of applying a solution of the disclosure is given below. 
         [0109]    The embodiment relates to network-resource allocation during multi-service group movement, service continuity and center replacement under the circumstance of single-point failure during group movement. 
         [0110]    A type of a service in the embodiment includes: a video service delivering circumstances of a fire site, casualties, and the like through images, so as to provide a reference for service arrangement by a commander upon reaching the site; a traffic navigation service providing real-time information on roads to firemen and providing optimal driving directions such that a fire engine may arrive at a fire site as soon as possible; and a message service informing a commander of personnel, equipments, and neighboring units and providing a basis for unified scheduling upon reaching a site. 
         [0111]    Firstly, the mobility management platform calculates a matching value between a service and a network based on a type and a priority of the service and a parameter of real-time performance of the network. Wireless network resources allocated for services by the mobility management platform according to matching values are as shown in Table 1. 
         [0000]    
       
         
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                 service type 
                 service use 
                 allocated network 
               
               
                   
               
             
             
               
                 video service 
                 circumstances of a 
                 3G network/Wifi network 
               
               
                   
                 fire site (fire, 
               
               
                   
                 casualties, etc) 
               
               
                 navigation service 
                 traffic and road 
                 GPS network/Compass 
               
               
                   
                 information 
                 navigation network 
               
               
                 message service 
                 personnel, 
                 mobile cellular network 
               
               
                   
                 equipments, and 
               
               
                   
                 neighboring units 
               
               
                   
               
             
          
         
       
     
         [0112]    The mobility management platform determines service centers, each responsible of service-stream sending for a respective video, navigation, or message service. When a single-point failure occurs at a service center, taking herein a navigation service for example, a service center of the navigation service (where a single-point failure occurs due to network signal interruption or a failure) selects the service center of the video service as a temporary service center of the navigation service to provide the navigation service to a group; when a new service center of the navigation service is determined, the service center of the video service hands the navigation service over to the new service center. With a center replacing flow, no interruption occurs to a navigation service during service execution, ensuring success of a fire extinction service. 
         [0113]    what describe are merely embodiments of the disclosure, and are not intended to limit the scope of the disclosure.