Prepaid Wireless Service Billed in Real Time

Prepaid Wireless Service Billed in Real Time - Prepaid...

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Unformatted text preview: Prepaid Wireless Service Billed in Real Time Definition Prepaid wireless service requires payment from the subscriber before wireless providers will extend service. Real-time billing debits the prepaid subscriber's account as the prepaid subscriber uses service and prevents the prepaid subscriber from exceeding the account's available balance. Overview Transmission control protocol (TCP)/Internet protocol (IP) and signaling system 7 (SS7) networks are designed to provide reliable communications between service nodes 365 days a year, seven days a week, and 24 hours a day. The wireless intelligent network (WIN) uses the existing TCP/IP and SS7 network infrastructures in combination with the American National Standards Institute (ANSI)–41 standard to allow wireless providers to offer the enhanced services made possible by an intelligent network without the expense of deploying a new network infrastructure. One such enhanced service is real-time billing for prepaid accounts. Real-time billing decreases the wireless provider's credit exposure due to prepaid accounts while offering the prepaid subscriber the ease of a prepaid account that mirrors postpaid convenience. After completing this tutorial, the reader will understand how the WIN enables a wireless provider to bill prepaid accounts in real time when the subscriber is located in the home area. The reader is expected to be familiar with networking, signaling, and telecommunication technologies and standards. Topics 1. Network Architecture 2. Positive-Balance Call Origination 3. Positive-Balance Call Termination Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 1/13 4. Mid-Call Zero Talk Time at Home 5. Zero Talk Time at Home Self-Test Correct Answers Glossary 1. Network Architecture The network architecture of a WIN platform links signal switching points (SSP), signal transfer points (STP), and signal control points (SCP). The WIN platform rests upon the SS7, TCP/IP, and voice networks. Serving Mobile Services Switching Center (S_MSC): The S_MSC is the interface between the radio system and the public switched telephone network (PSTN). The S_MSC provides the transport and translation support for call origination from and termination to the subscriber. Signal Transfer Point (STP): The STP is a SS7 network packet switch that routes SS7 messages to the proper destination. Signaling Interface Unit (SIU): The SIU converts SS7 messages into TCP/IP. The SIUs are redundantly deployed to provide alternate paths for greater reliability. ISUP Call Control Unit (ICC): The ICC is the gateway between the SIU and the SCP's intelligent peripheral. The ICC directs messages to the proper destination. Remote Service Unit (RSU): The RSU is an intelligent peripheral co-located with the S_MSC. The RSU is an adjunct switch that controls the prepaid calls and processes integrated voice response (IVR) messages. Market Server: The market server contains the subscriber database and serves as the call rating engine. Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 2/13 Figure 1: Network Architecture 2. Positive-Balance Call Origination The prepaid subscriber initiates a call within the home area. When the S_MSC detects the origination attempt, it sends an origination request invoke message (ORREQ) to its remote service unit (RSU). The RSU determines that the mobile identification number (MIN) is a prepaid account and queries the market server for talk time available to this account. The market server calculates the available talk time and forwards it to the RSU. The RSU sends an origination request return result message (orreq) to the S_MSC to indicate that call processing can continue. The S_MSC attempts to connect the call. When the S_MSC detects an answer, it sends an origination answer message (OANSWER) to the RSU. The RSU begins timing the call, and the call is connected. The subscriber ends the call. The S_MSC sends an origination disconnect invoke message (ODISCONNECT) to the RSU. The RSU stops timing the call and sends the call duration to the market server. The market server prices the call and decrements the subscriber's account. The RSU sends an origination disconnect return result message (odisconnect) to the S_MSC, and the S_MSC releases the call. Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 3/13 Figure 2: Positive-Balance Call Origination 3. Positive-Balance Call Termination A call arrives at the S_MSC for the prepaid subscriber. Recognizing the subscriber's ID, the S_MSC sends a location request invoke message (LOCREQ) to its home location register (HLR). The HLR returns a location request return result message (locreq) to the S_MSC, indicating that the S_MSC should send an ANLYZD to the RSU. Upon receipt of the ANLYZD from the S_MSC, the RSU queries the market server to determine if the MIN is a prepaid account and, if so, the amount of talk time available to the MIN. The market server validates the MIN, calculates the available talk time, and forwards the available talk time to the RSU. The RSU sends an anlyzd to the S_MSC to indicate that call processing can continue. The S_MSC routes the call to the subscriber. The RSU starts timing the call when the subscriber answers. The calling party is then connected to the subscriber. Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 4/13 When the subscriber ends the call, the S_MSC sends a termination disconnect invoke message (TDISCONNECT) to the RSU. The RSU stops timing the call and sends the call duration to the market server. The market server prices the call and decrements the subscriber's account. The RSU sends a termination disconnect return result message (tdisconnect) to the S_MSC. The S_MSC releases the call. Figure 3: Positive-Balance Call Termination 4. Mid-Call Zero Talk Time at Home The prepaid subscriber initiates a call within the home area. When the S_MSC detects the origination attempt, it sends an ORREQ to its RSU. The RSU determines that the MIN is a prepaid account and queries the market server for talk time available to this account. The market server calculates the available talk time and forwards it to the RSU. The RSU sends an orreq to the S_MSC to indicate that call processing can continue. The S_MSC attempts to connect the call. When the S_MSC detects an answer, it sends an OANSWER to the RSU. The RSU begins timing the call, and the call is connected. Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 5/13 During the call, the RSU detects that the subscriber's balance has reached the low threshold. The RSU then sends a CCDIR to the S_MSC, indicating that the subscriber should hear the low-balance warning. The S_MSC plays the lowbalance warning to the subscriber. The S_MSC responds to the RSU with a ccdir to indicate that the low-balance warning was played. The subscriber ends the call. The S_MSC sends an ODISCONNECT to the RSU. The RSU stops timing the call and sends the call duration to the market server. The market server prices the call and decrements the subscriber's account. The RSU sends an odisconnect to the S_MSC and the S_MSC releases the call. Figure 4: Mid Call Zero Talk Time 5. Zero Talk Time at Home The prepaid subscriber initiates a call within the home area. When the S_MSC detects the origination attempt, it sends an ORREQ to its RSU. The RSU Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 6/13 determines that the MIN is a prepaid account and queries the market server for talk time available to this account. The market server returns zero available minutes of talk time to the RSU. The RSU sends an orreq to the S_MSC to indicate zero talk time and the need to play the insufficient balance announcement. The S_MSC plays the insufficient balance announcement to the subscriber and releases the call. Figure 5: Start of Call Zero Available Minutes Self-Test 1. Real-time billing of prepaid accounts decreases the wireless provider's credit exposure. a. True b. False 2. The ______________ is a SS7 network packet switch. a. SIU b. ICC c. STP d. S_MSC 3. The _______________ is an adjunct switch that controls prepaid calls and processes IVR messages. Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 7/13 a. ICC b. SIU c. RSU d. Market Server 4. When the S_MSC detects an origination attempt, it sends an _______________ to the RSU. a. orreq b. ODISCONNECT c. OANSWER d. ORREQ 5. The RSU does not allow the S_MSC to connect the call if the prepaid account balance is sufficient to make the call. a. True b. False 6. Before terminating a call to the subscriber, the S_MSC must first: a. start timing the call b. calculate the available talk time c. send a LOCREQ to its HLR d. send an ANLYZD to the RSU 7. If the subscriber's account reaches zero during a call, the S_MSC does not disconnect the call. a. True b. False 8. The _______________ message directs the RSU to stop timing the call. a. ORREQ b. ODISCONNECT Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 8/13 c. CCDIR d. Odisconnect 9. If a subscriber attempts to make a call with a zero account balance, the S_MSC connects the call. a. True b. False 10. The WIN platform rests upon the following network(s): a. SS7 b. TCP/IP c. Voice d. All of the Above Correct Answers 1. Real-time billing of prepaid accounts decreases the wireless provider's credit exposure. a. True b. False See Overview 2. The ______________ is a SS7 network packet switch. a. SIU b. ICC c. STP d. S_MSC See Topic 1 3. The _______________ is an adjunct switch that controls prepaid calls and processes IVR messages. Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 9/13 a. ICC b. SIU c. RSU d. Market Server See Topic 1 4. When the S_MSC detects an origination attempt, it sends an _______________ to the RSU. a. orreq b. ODISCONNECT c. OANSWER d. ORREQ See Topic 2 5. The RSU does not allow the S_MSC to connect the call if the prepaid account balance is sufficient to make the call. a. True b. False See Topic 2 6. Before terminating a call to the subscriber, the S_MSC must first: a. start timing the call b. calculate the available talk time c. send a LOCREQ to its HLR d. send an ANLYZD to the RSU See Topic 3 7. If the subscriber's account reaches zero during a call, the S_MSC does not disconnect the call. Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 10/13 a. True b. False See Topic 4 8. The _______________ message directs the RSU to stop timing the call. a. ORREQ b. ODISCONNECT c. CCDIR d. Odisconnect See Topic 2 9. If a subscriber attempts to make a call with a zero account balance, the S_MSC connects the call. a. True b. False See Topic 5 10. The WIN platform rests upon the following network(s): a. SS7 b. TCP/IP c. Voice d. All of the Above See Topic 1 Glossary ANSI American National Standards Institute HLR Home Location Register Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 11/13 ICC ISUP Call Control Unit IVR Integrated Voice Response LOCREQ Location Request Invoke Message locreq Location Request Return Result Message MIN Mobile Identification Number OANSWER Origination Answer Message ODISCONNECT Origination Disconnect Invoke Message odisconnect Origination Disconnect Return Result Message ORREQ Origination Request Invoke Message orreq Origination Request Return Result Message PSTN Public Switched Telephone Network RSU service node Remote Service Unit Signal Interface Unit S_MSC Serving Mobile Switching Center SCP Signal Control Point SS7 Signaling System 7 SSP Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 12/13 Signal Switching Point STP Signal Transfer Point TCP/IP Transmission Control Protocol/Internet Protocol TDISCONNECT Termination Disconnect Invoke Message tdisconnect Termination Disconnect Return Result Message WIN Wireless Intelligent Network Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 13/13 ...
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