VPMN Business Description

Discussion on VPMN business

1 Introduction
With the increasingly fierce competition in the mobile communication market, the contention of the communication enterprises to the customer group has become more and more intense. For some of the very large customer base, we call it a big customer. The contention for the large customer groups is the focus of competition among the communication enterprises. Large customer groups are often dominated by group clients. Group clients have the characteristics of high consumption, good credit and low payment rate. Once the group customers lost, the loss of revenue for mobile communications enterprises is self-evident. In order to win the group's customers, many mobile operators have launched the VPMN business, that is, to attract and stabilize the group's customers by offering preferential intra-group calls. VPMN is the short name of virtual Private mobile network, which is also known as Mvpn in some areas.
2 VPMN Technology Implementation Plan
The VPMN business can be implemented either through an intelligent network or a non-intelligent network. The realization mode of the intelligent network is divided into two kinds: Overlay network realization mode and target network realization mode.
2.1 Overlay Network Implementation mode
When MSC has not yet fully upgraded to MSC/SSP, it can be implemented in the overlay network in overlay way, triggering the intelligent business according to the special access number, but the promotion of the business is limited by the number segment, the business characteristic is relatively single. With the continuous development of the Intelligent Network, overlay network can not adapt to the new needs.
2.2 Realization Mode of target net
(1) Overview of the target network
When all MSC and HLR are upgraded to support Camel PHASE2, map2+, IsUp, and camel signing information to trigger an intelligent business, the smart business can be triggered on the target network based on a smart user's sign-in information (CSI), and the purpose of the intra-group call offer is achieved. Business promotion is not limited by the number of segments, can serve a wider range of mobile users, the business features are richer, and support intra-group dialing. Therefore, the target network is a good way to realize the VPMN business.
Where the VPMN business is carried out, the user's contract information O/T-CSI stored in HLR, and the group user's data is centrally placed in the SCP (Service Control point). In the process of the call, the SCP carries billing information in the signaling, charges the user's call based on the group number to which the user belongs and the corresponding rate corresponding to the group, and carries out a real-time deduction from the user account or group account.
(2) calling process and billing principle in Target network

1 shows the calling process for the VPMN user within the target network. The SSP refers to service switch point. The call flow is as follows: We represent the caller with a, b means called. When the main call VPMN user in the target network MSCA/VLR/SSP coverage, MSCA/VLR/SSP received the call, according to the call signing information O-CSI trigger the business, directly MSCA/VLR/SSP location of the long-distance code in the IDP (initial Detect point) message in the location number parameter, and the IDP message is sent to SCPA. SCPA after receiving the IDP message, first analyze the calling user account and get the long distance code from the location number parameter in the IDP message to the caller. In order to support the main call of the same city special case (do not charge long-distance charges), when called as mobile users, SCPA to be called HLR sent ATI (any time inquest), get called dynamic roaming number (MSRN), when called as a fixed network user, SCPA according to the called area code to determine. SCPA determines the calling rate based on the principal called Attribution location and call location and translates the balance into the length of the call, sending Rrbe (Request report BCSM EVENT,BCSM refers to the basic call status model), AC (Apply Charging) to MSCA/VLR/SSP. The SCPA then sends an FCI (furnish charging information) operation to the MSCA/VLR/SSP. MSCA/VLR/SSP the information specified by inserting an FCI operation into the calling order. The reason for sending an FCI operation before sending continue (or connect) is that the automated machine in the SSP is in the waiting instruction state, and the FCI is not disturbed by other messages, and after the SSP receives continue (or connect), When an SSP's automaton enters the monitoring state, there is the possibility of interference by other messages, and the implementation of different SSP manufacturers may produce different results. If an FCI is sent after the ACR (apply charging report) is received, there is also the possibility that the SSP will not receive an FCI. SCPA then sends continue to MSCA/VLR/SSP. The MSCA/VLR/SSP is continued according to the called number in the Tup message. The master, called by either party, means that the call is over, and the MSCA/VLR/SSP reports the billing report (generating the statement) and the hang-up event.
Billing principle: VPMN users during the call process, will also be on the MSC and SCP to generate a statement. In the billing process, it should be based on the SCP generated, and in the SCP real-time debit. Therefore, the VPMN user statement generated on the MSC should be deleted. In the above call process, the information specified by the FCI operation is inserted into the calling order (MOC), which can be used as the basis for the VPMN user's phone order. To do this, the format of the MSC statement must be modified to increase the fields that record FCI information.
(3) The called process and the principle of billing processing in the target network

2 shows the called Process of the VPMN user within the target network. The call flow is as follows: MSCA/VLR/SSP receives the call, sends an SRI (send routing information) message to the called HLR, is called HLR returns the contract information T-CSI (Terminated-camel substriber Information). MSCA/VLR/SSP the address that is called SCPB from the T-CSI data, send the IDP message to SCPB, and then place the long-distance area code of the MSCA/VLR/SSP in the location number in the IDP message. SCPB after receiving the IDP message, analyze the called user account, determine the rate based on the called Attribution and the actual location called, and convert the balance to the length of the call, sending Rrbe and AC to MSCA/VLR/SSP. SCPB the generic number parameter in the connect operation to the special prefix (60) + The calling real number, which is sent to the MSCA/VLR/SSP via the connect operation. After receiving connect, MSCA/VLR/SSP sends the SRI message to the called HLR again, resulting in MSRN. The MSCA/VLR/SSP is continued according to the called MSRN. When the Lord is called on either side to hang up the phone means the call is over, and finally the MSCA/VLR/SSP event is reported and a statement is generated. Billing processing principle: In the called process, SCPB first changes the generic number parameter in the connect operation to a special code, and then sends the connect operation to MSCA/VLR/SSP. MSCA/VLR/SSP changes the calling number according to generic numbers in the connect operation, and the modified calling number format is: Special prefix (60) + calling real number. The called visiting office fills in the calling number of the call order with a special prefix in the IAI (initial address message with additional information) or IAM (initial address message). and the IAI or IAM in the calling number before the special prefix removed, and then to be called as Caller ID display. In the called Call list (MTC) generated by MSC, the VPMN user's calling number is prefixed with a special prefix (60), which can be used as the basis for determining the VPMN user's phone list and is deleted by the billing system. The special prefix must be set to ensure that it is not the same as the current mobile phone number segment, fixed network area code of all or the previous few, in order to avoid ambiguity in the billing process.
(4) How to deal with the VPMN service of target network in boss system

3 shows the interface between the business Operation support System (the Boss System) and the GSM network and the Intelligent network. VPMN user data management, such as put number, account opening, sales and other operations in the SMP (service manage point), but also must modify the user profile in HLR, designated as a smart network user. VPMN user's payment via the interface between the boss system and SCP, the amount is sent to the user account in SCP. VPMN user's words are generated in the SCP, the boss system is collected and sent to the user's single database, and then the account processing system to generate VPMN users monthly bills to track the user's consumption status. The billing and accounting systems in the boss system do not actually debit the accounts of VPMN users in real time in the SCP.
For different groups of users, you can set different rates to reflect the different benefits. The rate information for the group user is stored in the SCP, and the user's account balance is used to calculate the available call duration for the user during the call. Operators can dynamically adjust the rate of group customers according to the consumption status of group users, payment timeliness and other factors to achieve the purpose of stimulating consumption, reducing arrears and stabilizing customer groups.
Only calls between VPMN users and VPMN users (whether or not they belong to the same group of users) can generate a statement and debit on the SCP. If the VPMN user is talking to a non-VPMN user, the Smart Network service cannot be triggered, that is, it is not possible to generate a statement in SCP. Therefore, it is necessary to use the form of the MSC on the basis of billing, the boss billing after the account of the bill sent to the SCP debit.
Nationwide target network upgrades cannot be completed at the same time. When a VPMN user roams to a non-target area and calls the VPMN user, the user's call is not able to generate a statement and debit in the SCP and must be used as the basis for billing in the visiting MSc. This type of statement is returned to the place of attribution by the place of visit, and the boss system is re-billed according to the preferential terms of the VPMN user and generates a bill, which is then sent to the SCP for debit.
VPMN The majority of users belong to large customers, so in the intelligent network business must take into account the large number of customers to take a series of special services, such as the arrears of non-stop and so on. In the SCP setting, should allow the VPMN user overdraft use, otherwise may in the group user payment is not timely, causes the group user the large area to stop the phenomenon.
2.3 How to implement non-intelligent network
In areas where the switching network does not yet have an upgrade to an intelligent network, the VPMN business can also be implemented in a non-intelligent network (all depending on the software) through the boss system. In the business system, the large customer group is unified number. In the billing system, the definition of large customer group rates and preferential conditions. In the billing process, through the combination of business information to achieve the benefits of group customers. In order to adapt to the frequent changes of preferential conditions, it is generally possible to use the general principle of first billing, and then according to the preferential conditions of VPMN business two times the method of billing. The VPMN business investment in pure software is relatively small, the method is relatively simple, the business development time is short, can seize the market faster. But can not achieve the group within the reduction of dialing, real-time deduction, such as the need for hardware support functions, and only the quasi-real-time deduction fee.
3 Summary
The VPMN business is a business aimed at attracting the group's customers through intra-group offers, in response to the increasingly competitive mobile communications market. Operators through the benefit of the way to launch this business, will be big customers bring greater benefits. Taking the amount of total consumption as the standard of whether group users can enjoy VPMN discount and enjoy VPMN preferential rate, will stimulate the traffic volume, improve the loyalty of the group users and improve the service quality of the operators.

VPMN Business Description