US20090323623A1 - Event Notification in a Hybrid Network - Google Patents
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- US20090323623A1 US20090323623A1 US12/551,073 US55107309A US2009323623A1 US 20090323623 A1 US20090323623 A1 US 20090323623A1 US 55107309 A US55107309 A US 55107309A US 2009323623 A1 US2009323623 A1 US 2009323623A1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0016—Arrangements providing connection between exchanges
- H04Q3/0029—Provisions for intelligent networking
- H04Q3/0045—Provisions for intelligent networking involving hybrid, i.e. a mixture of public and private, or multi-vendor systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
- H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
- H04W8/24—Transfer of terminal data
- H04W8/245—Transfer of terminal data from a network towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13098—Mobile subscriber
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13296—Packet switching, X.25, frame relay
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- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W68/12—Inter-network notification
Definitions
- the present invention relates generally to the operation of mobile stations in a hybrid wireless communication network, and more particularly, to an event notification procedure to make more efficient use of network resources.
- HDR high data rate
- a hybrid network that combines two or more networks with different signaling protocols and different air interfaces complicates signaling and session management.
- a hybrid network combines an IS2000 radio access network providing voice and packet data services with a data only network, such as an IS-856-A High Rate Packet Data (HRPD) access network, providing high rate packet data services.
- HRPD High Rate Packet Data
- a mobile station with an active packet data session in the HRPD access network may need to switch to the IS2000 network to perform some task, such as answer a voice call.
- the mobile station may stop listening to the base station in the HRPD access network and, under current standards, is not required to inform the HRPD access network. After switching from the packet switched network to the circuit switched network, the mobile station could power down without returning to the packet switched network.
- the HRPD access network may assume that the mobile station is still present and listening, or that it may return, and consequently reserve resources to serve the no longer present mobile station. If the HRPD access network receives incoming packet data for the mobile station, the HRPD access network may attempt to deliver the data to the mobile station, which is no longer present. The attempt to deliver the packet data will fail and the HRPD access network will eventually deduce that the mobile station is no longer listening. At that point, the HRPD access network will release resources and update the packet data serving node for accounting purposes.
- the packet switched network may send a request to a Mobile Switching Center (MSC) to page the mobile station in the IS2000 network before releasing resources. If the mobile station has powered down, the attempts to page the mobile station will be futile and will unnecessarily consume network resources.
- MSC Mobile Switching Center
- the present invention provides a method of managing a communication session with a mobile station in a hybrid network including a circuit switched network and a packet switched network. While operating in the packet switched network, the mobile station may request circuit services notifications through the packet data network.
- a mobile switching center (MSC) in the circuit switched network stores an indication that the mobile station is operating within the packet switched network and sends circuit services notifications to the mobile station via the packet switched network.
- the MSC sends event notifications to the packet switched network responsive to predetermined events, such as a presence event or a power down event, indicating a change in the status of the mobile station.
- the packet switched network uses the event notifications to better manage network resources.
- a presence event is an event that indicates that the mobile station is present in the network.
- a mobile station operating in the packet switched network may receive a circuit services notification, such as a page message, from the circuit services notification application (CSNA). In this case, the mobile station may switch to a carrier in the circuit switched network and send a page response or other message.
- the MSC detects the mobile station in the circuit switched network and the mobile station has requested forwarding of circuit services notifications via the packet switched network
- the mobile switching center sends an event notification message to the packet switched network indicating that the mobile station has been detected. If resources had been reserved for the mobile station, for example, to support an active packet data call, the packet switched network can release those resources, making them available for others to use. Further, the packet switched network may send an accounting update to a packet data serving node to update the accounting.
- the present invention facilitates early release of communication resources, which will increase system throughput and, therefore, system capacity.
- the mobile station may power down without returning to the packet switched network.
- the packet switched network may continue to reserve resources, such as A10 connections, and store information for the mobile station in the event that the mobile station returns to the packet switched network.
- the MSC may send an event notification to the packet switched network to notify the packet switched network that the mobile station has powered down.
- the packet switched network can then release any resources reserved for the mobile station, such as A10 connections.
- FIG. 1 is a block diagram of a hybrid network according to the present invention.
- FIG. 2 is a call flow diagram illustrating an exemplary scenario using the event notification procedure according to the present invention.
- FIG. 3 is a flow chart illustrating a procedure executed by the MSC to implement the session management procedure of the present invention.
- FIG. 4 is a flow chart illustrating a procedure implemented by an HRPD access network to implement the session management procedure according to the present invention.
- FIG. 5 is a flow chart illustrating another procedure implemented by an HRPD access network to implement the session management procedure according to the present invention.
- FIG. 6 is a block diagram illustrating exemplary details of a mobile switching center and HRPD access network.
- the hybrid network 10 comprises a combined network incorporating both an IS2000 radio access network (IS2000 RAN) 12 and an HRPD access network (IS856-A) 14 .
- IS2000 RAN IS2000 radio access network
- IS856-A HRPD access network
- the IS2000 RAN 12 comprises one or more base stations 24 connected to a circuit switched core network (CSCN) 20 .
- the CSCN 20 provides primarily voice services and low rate data services, such as facsimile services, to the mobile stations 100 .
- the CSCN 20 includes a mobile switching center (MSC) 22 that provides a connection to the public switched telephone network (PSTN) 16 .
- the MSC 22 routes traffic between the PSTN 16 and the base stations 24 .
- the base stations 24 communicate with the mobile stations 100 over the air interface.
- the base stations 24 forward downlink traffic and signaling from the MSC 22 to the mobile stations 100 , and forward uplink traffic and signaling from the mobile stations 100 to the MSC 22 .
- the IS2000 may also provide packet-switched services, though this capability is not material to the present invention and is not discussed further herein.
- the HRPD RAN 14 is a high data rate (HDR) network and may be combined with an IS2000 network to provide high speed packet data services.
- the IS856 standard is generally known as 1xEV-DO.
- the HRPD RAN 14 comprises one or more access networks (ANs) 36 for communicating with the mobile stations 100 , and a packet core function (PCF) 34 connecting the HRPD AN 36 to a packet switched core network (PSCN) 30 .
- the PSCN 30 includes a PDSN 32 that connects to a packet data network 18 , such as the Internet.
- the PDSN 32 establishes communication sessions with mobile stations 100 using, for example, the point-to-point protocol (PPP).
- PPP point-to-point protocol
- the HRPD AN 36 forwards mobile terminated packet data from the PDSN 32 to the mobile stations 100 , and forwards mobile-originated packet data to the PDSN 32 .
- the mobile station 100 may still want to receive notifications from the MSC 22 relating to circuit switched services without having to periodically return to the IS2000 RAN 12 to receive such notifications.
- mobile station 100 may want to receive paging messages over the IS856 air interface alerting the mobile station 100 to incoming voice calls.
- the HRPD AN 36 includes a 3G1x Circuit Services Notification Application (CSNA) 42 , which may be seen in FIG. 3 .
- the CSNA 42 could be located in the PCF 34 .
- the CSNA 42 provides circuit services notifications to mobile stations 100 over the IS856-A air interface.
- the CSNA 42 uses the Circuit Services Notification (CSN) protocol.
- CSN Circuit Services Notification
- the CSN protocol also ensures that the mobile station 100 stays registered with the CSCN 20 even when it is monitoring the IS856 packet data channel.
- the CSNA 42 is described in cdma 2000 High Rate packet Data Air Interface Specification, 3GPP2 C.20024-A, Version 1.0 (March 2004), which is incorporated herein by reference.
- the mobile station 100 may request circuit services notifications from the HRPD RAN 14 , causing the CSNA 42 to notify the MSC 22 to send notification messages to the mobile station 100 via the HRPD RAN 14 .
- the CSNA 42 and mobile station 100 may configure a filter that allows notifications associated with only certain circuit switched services to be sent over the IS856 air interface.
- the MSC 22 When the mobile station 100 requests circuit services notifications from the IS856 network, the MSC 22 will be informed that the mobile station 100 has requested CSNA services and will send circuit services notifications to the mobile station 100 via the HRPD AN 36 .
- the CSNA 42 in the HRPD AN 36 receives the circuit services messages from the MSC 22 , and the CSNA 42 in turn provides circuit service notifications to the mobile station 100 .
- the circuit services notification sent to the mobile station 100 may cause the mobile station 100 to transition to the IS2000 RAN 12 .
- the CSNA 42 may receive a paging request message from the MSC 22 and send a page message to the mobile station 100 responsive to the paging request message causing the mobile station 100 to transition to the IS2000 RAN 12 to receive a voice call.
- the mobile station 100 may autonomously transition to the IS2000 RAN 12 .
- the mobile station 100 may transition to the IS2000 RAN 12 to originate a voice call.
- the mobile station 100 is not required to notify the HRPD AN 36 when it transitions to the IS2000 RAN 12 . If the mobile station 100 is engaged in an active packet data session, the HRPD AN 36 will continue to reserve radio resources for the active packet data session with the mobile station 100 . The PDSN 32 will forward packet data to the HRPD AN 36 , which will attempt to deliver the packet data to the mobile station 100 . The HRPD AN 36 , through the use of internal mechanisms such as inactivity timers, failed delivery attempts, etc., will eventually determine that the mobile station 100 is not longer listening on the IS856 carriers and will release the radio and communication resources that have been reserved for the mobile station 100 . The HRPD AN 36 may request the MSC to page the mobile station in the IS2000 RAN 12 and wait for a response from the mobile station 100 before releasing resources.
- the radio and communications resources reserved for the mobile station 100 are not being used. Releasing reserved radio and communication resources as early as possible would improve overall throughput of the network, and therefore, increase system capacity. Further, releasing resources when the mobile station 100 transitions to the IS2000 network can reduce accounting discrepancies.
- a method for sending event notifications between the IS2000 RAN 12 and the HRPD RAN 14 to more efficiently manage resources.
- the mobile station 100 may request forwarding of circuit services notifications through the HRPD RAN 14 .
- the HRPD AN 36 receives a request for circuit services notifications via the HRPD RAN 14 , it notifies the MSC 22 via an A1 signaling link 38 that the mobile station 100 is operating within the IS 856 RAN 14 .
- the MSC 22 stores an indication, referred to herein as the forwarding flag, indicating that the mobile station 100 is operating within the HRPD RAN 14 . This flag indicates that circuit services notifications should be forwarded to the mobile station 100 through the HRPD RAN 14 .
- the forwarding flag is also used to determine when event notifications should be sent by the MSC 22 to the HRPD RAN 14 . When the forwarding flag is set, the MSC 22 sends event notifications to the HRPD RAN 14 responsive to certain predetermined events.
- a presence event occurs when the IS2000 RAN 12 detects the mobile station 100 after the mobile station 100 has transitioned from the HRPD RAN 14 .
- the MSC 22 detects the presence of a mobile station 100 after it has transitioned to the IS2000 RAN 12 , the MSC 22 sends an event notification to the HRPD RAN 14 .
- This situation may occur for example when the mobile station 100 involved in an active packet data session in the HRPD RAN 14 receives a circuit services notification, such as a page message. Responsive to the page message or other circuit services notification, the mobile station 100 transitions to the IS2000 RAN 12 .
- the mobile station 100 could also transition to the IS2000 RAN 12 on its own initiative, for example, to initiate a voice call.
- the MSC 22 detects that the mobile station 100 has transitioned to the IS2000 RAN 12 and the forwarding flag is set, the MSC 22 sends an event notification message to the HRPD RAN 14 to notify the HRPD RAN 14 of the presence event.
- the HRPD RAN 14 can release resources reserved for the mobile station 100 and send an accounting update to the PDSN 32 to update accounting.
- the HRPD RAN 14 places the packet data session in a dormant state responsive to the event notification.
- the HRPD RAN 14 may tear down its A8 connection and release any air interface resources reserved for the mobile station while maintaining the A10 connection to the PDSN 32 .
- the power down event Another event that may trigger an event notification is referred to herein as the power down event.
- the MSC 22 may send an event notification to the HRPD RAN 14 to notify that the mobile station 100 is no longer reachable.
- the HRPD RAN 14 terminates the packet data session and tear down the A10 connection to the PDSN 32 .
- the HRPD RAN 14 may send an event notification to the IS2000 RAN 12 when the mobile station 100 powers down while present in the HRPD RAN 14 .
- FIG. 2 is a call flow diagram illustrating how event notifications may be used.
- the call flow diagram is meant to be illustrative. Those skilled in the art will recognize that the present invention may be implemented in other procedures.
- the mobile station 100 establishes an active packet data call with the HRPD RAN 14 (step a). It is assumed that the mobile station 100 has requested CSNA services and that the MSC 22 has set the forwarding flag as previously described. While the mobile station 100 is involved in an active packet data call, the MSC 22 sends an A1 paging request to F the HRPD AN 36 (step b), and the HRPD AN 36 sends an IS2000 page message to the mobile station 100 encapsulated within a IS856-A air interface message (step c).
- the mobile station 100 transitions to the IS2000 RAN 12 and sends an IS2000 page response encapsulated within a IS856-A air interface message (step d).
- the IS2000 BS 24 receives the page response from the mobile station 100 , reformats the page response, and sends an A1 paging response to the MSC 22 (step e).
- the MSC 22 sends an event notification to the HRPD AN 36 indicating that the mobile station 100 has been detected in the IS2000 RAN 12 (step f).
- the HRPD RAN 14 stops its inactivity timer and releases radio and communication resources assigned to the mobile station 100 .
- the HRPD AN 36 also sends an accounting update to the PDSN 32 to update accounting for the packet data call (step g).
- the packet data call goes into a dormant state (step h).
- the HRPD RAN 14 maintains a connection with the PDSN 32 for the packet data call but there is no communication channel established between the HRPD RAN 14 and the mobile station 100 .
- the communication channel for the packet data call can be re-established at the initiative of either the HRPD RAN 14 or the mobile station 100 . Procedures for re-establishing the packet data calls are not material to the present invention.
- the mobile station 100 powers down without returning to the HRPD RAN 14 .
- the mobile station 100 and MSC 22 execute a power down procedure (step i).
- the mobile station 100 sends a power down indication to the IS2000 BS 24 , which in turn sends a Clear Request message to the MSC 22 to initiate call clearing.
- the MSC 22 sends a Clear Command message to the IS2000 BS 24 , which releases the resources allocated to the mobile station and sends a Clear Complete message with a power down indicator to the MSC 22 .
- the MSC 22 sends an event notification to the HRPD RAN 14 (step j) and the HRPD RAN 14 terminates the packet data session and releases the A10 connection to the PDSN 32 .
- FIG. 3 is a flow diagram illustrating an exemplary notification procedure 60 implemented by the MSC 22 .
- the procedure 60 begins when the MSC 22 receives a request from the HRPD RAN 14 to send circuit services notifications to the mobile station 100 via the HRPD AN 36 (block 62 ).
- the MSC 22 sets a forwarding flag to true (block 64 ).
- the MSC 22 determines the setting of the forwarding flag (block 68 ).
- the detected event may, for example comprises a presence event, power down event, or some other event. If the forwarding flag is set to true, the MSC 22 sends the HRPD RAN 14 an event notification (block 70 ).
- the event notification includes an indication of the type of the event.
- the MSC 22 responds to the event normally as specified in applicable standards (block 72 ) and the process ends (block 74 ). If the forwarding flag is set to false (block 68 ), the MSC 22 processes the received message from the mobile station 100 normally (block 72 ).
- FIG. 4 illustrates an exemplary resource management procedure 80 implemented by an HRPD RAN 14 for responding to a presence event. It is assumed that the mobile station 100 has requested CSNA services and that the presence flag at the HRPD AN 36 is set to true.
- the procedure begins when the HRPD AN 36 receives a notification that the mobile station 100 has been detected in the IS2000 RAN 12 (block 82 ).
- the HRPD AN 36 determines if a packet data call is active (block 84 ). If so, the HRPD AN 36 stops its internal inactivity timer (block 86 ) and releases resources assigned to the mobile station 100 (block 88 ).
- the HRPD AN 36 sends an accounting update to the PDSN 32 (block 90 ) and sets a presence flag equal to false (block 92 ).
- the presence flag indicates whether the mobile station 100 is present and listening in the HRPD AN 36 .
- the HRPD AN 36 can use the presence flag to determine if it should attempt delivery of packet data over the IS856 air interface, or send a request to the MSC 22 to page the mobile station 100 .
- the HRPD AN 36 sets the presence flag to false (block 92 ) and the procedure ends (block 94 ).
- FIG. 5 illustrates an exemplary procedure 110 implemented by the HRPD AN 36 for responding to a power down event.
- the procedure begins when the HRPD AN 36 receives an event notification from the MSC 22 indicating that the mobile station 100 has powered down (block 112 ).
- the HRPD AN 36 determines if a packet data call session exists (block 114 ). If so, the HRPD AN 36 terminates the packet data session (block 116 ), tears down the A10 connection to the PDSN 32 , and releases radio resources (block 118 ). Additionally, the HRPD AN 36 may send an accounting update to the PDSN 32 (block 120 ) and the procedure ends (block 122 ).
- FIG. 6 illustrates an exemplary MSC 22 and HRPD AN 36 in more detail.
- the MSC 22 includes a call control and mobility management circuit 46 for call control handling and mobility management functions, and a switch 48 for routing user traffic.
- the AN 36 includes a controller 40 and one or more sectors 44 .
- the sectors 44 contain the radio equipment for communicating with the mobile stations 100 .
- the controller 40 comprises the control portion of the AN 36 .
- the controller 40 processes call control signaling and manages the radio and communication resources used by the sectors 44 .
- the controller 40 includes the CSNA 42 , which may be implemented in a processor programmed to carry out the functions of the CSNA 42 .
- the CSNA 42 exchanges signaling with the MSC 22 and provides the circuit services notifications to mobile stations 100 over the IS856 air interface.
- Signaling traffic between the controller 40 and the MSC 22 is carried over the A1 interface.
- the A8 and A9 interfaces carry user traffic and signaling, respectively, between the HRPD AN 36 and PCF 34 .
- the A13 interface transfers user traffic and signaling between HRPD ANs 36 .
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Abstract
Description
- This application is a divisional of U.S. patent application Ser. No. 11/094,951, filed Mar. 31, 2005, which claims priority to Provisional U.S.
Patent Application 60/603,694 filed Aug. 23, 2004 and to Provisional U.S.Patent Application 60/652,585 filed Feb. 14, 2005, and which is incorporated herein by reference in its entirety. - The present invention relates generally to the operation of mobile stations in a hybrid wireless communication network, and more particularly, to an event notification procedure to make more efficient use of network resources.
- Cellular networks were originally developed to provide primarily voice services over circuit switched networks. The introduction of packet switched 2.5G and 3G networks enables network operators to provide data services as well as voice services. Eventually, network architecture is expected to evolve toward all-IP networks providing both voice and data services. However, network operators have a substantial investment in existing infrastructure and would therefore prefer to migrate gradually to an all-IP network architecture to allow them to continue to use their existing infrastructure. At the same time, network operators recognize that there is a demand for high rate packet-data services. In order to provide high-rate packet data services, network operators may deploy hybrid networks wherein a high data rate (HDR) network is overlaid on an existing circuit switched or packet switched network as a first step in the transition to an all IP-based network.
- A hybrid network that combines two or more networks with different signaling protocols and different air interfaces complicates signaling and session management. One example of a hybrid network combines an IS2000 radio access network providing voice and packet data services with a data only network, such as an IS-856-A High Rate Packet Data (HRPD) access network, providing high rate packet data services. A mobile station with an active packet data session in the HRPD access network may need to switch to the IS2000 network to perform some task, such as answer a voice call. The mobile station may stop listening to the base station in the HRPD access network and, under current standards, is not required to inform the HRPD access network. After switching from the packet switched network to the circuit switched network, the mobile station could power down without returning to the packet switched network. In either scenario, the HRPD access network may assume that the mobile station is still present and listening, or that it may return, and consequently reserve resources to serve the no longer present mobile station. If the HRPD access network receives incoming packet data for the mobile station, the HRPD access network may attempt to deliver the data to the mobile station, which is no longer present. The attempt to deliver the packet data will fail and the HRPD access network will eventually deduce that the mobile station is no longer listening. At that point, the HRPD access network will release resources and update the packet data serving node for accounting purposes. The packet switched network may send a request to a Mobile Switching Center (MSC) to page the mobile station in the IS2000 network before releasing resources. If the mobile station has powered down, the attempts to page the mobile station will be futile and will unnecessarily consume network resources.
- The present invention provides a method of managing a communication session with a mobile station in a hybrid network including a circuit switched network and a packet switched network. While operating in the packet switched network, the mobile station may request circuit services notifications through the packet data network. A mobile switching center (MSC) in the circuit switched network stores an indication that the mobile station is operating within the packet switched network and sends circuit services notifications to the mobile station via the packet switched network. According to various embodiments of the present invention, the MSC sends event notifications to the packet switched network responsive to predetermined events, such as a presence event or a power down event, indicating a change in the status of the mobile station. The packet switched network uses the event notifications to better manage network resources.
- One event that may trigger the event notification procedure is the presence event. A presence event is an event that indicates that the mobile station is present in the network. A mobile station operating in the packet switched network may receive a circuit services notification, such as a page message, from the circuit services notification application (CSNA). In this case, the mobile station may switch to a carrier in the circuit switched network and send a page response or other message. When the MSC detects the mobile station in the circuit switched network and the mobile station has requested forwarding of circuit services notifications via the packet switched network, the mobile switching center sends an event notification message to the packet switched network indicating that the mobile station has been detected. If resources had been reserved for the mobile station, for example, to support an active packet data call, the packet switched network can release those resources, making them available for others to use. Further, the packet switched network may send an accounting update to a packet data serving node to update the accounting. Thus, the present invention facilitates early release of communication resources, which will increase system throughput and, therefore, system capacity.
- Another event that may be useful to report is the power down event. After switching from the packet switched network to the circuit switched network, the mobile station may power down without returning to the packet switched network. The packet switched network may continue to reserve resources, such as A10 connections, and store information for the mobile station in the event that the mobile station returns to the packet switched network. In this scenario, the MSC may send an event notification to the packet switched network to notify the packet switched network that the mobile station has powered down. The packet switched network can then release any resources reserved for the mobile station, such as A10 connections.
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FIG. 1 is a block diagram of a hybrid network according to the present invention. -
FIG. 2 is a call flow diagram illustrating an exemplary scenario using the event notification procedure according to the present invention. -
FIG. 3 is a flow chart illustrating a procedure executed by the MSC to implement the session management procedure of the present invention. -
FIG. 4 is a flow chart illustrating a procedure implemented by an HRPD access network to implement the session management procedure according to the present invention. -
FIG. 5 is a flow chart illustrating another procedure implemented by an HRPD access network to implement the session management procedure according to the present invention. -
FIG. 6 is a block diagram illustrating exemplary details of a mobile switching center and HRPD access network. - Referring now to the drawings, the present invention will be described in the context of a
hybrid network 10 providing both voice and data services tomobile stations 100. In the exemplary embodiment shown herein, thehybrid network 10 comprises a combined network incorporating both an IS2000 radio access network (IS2000 RAN) 12 and an HRPD access network (IS856-A) 14. The exemplary embodiment is intended to be illustrative only and those skilled in the art will appreciate that the present invention may be used in networks based on other network standards. - The IS2000 RAN 12 comprises one or
more base stations 24 connected to a circuit switched core network (CSCN) 20. The CSCN 20 provides primarily voice services and low rate data services, such as facsimile services, to themobile stations 100. The CSCN 20 includes a mobile switching center (MSC) 22 that provides a connection to the public switched telephone network (PSTN) 16. The MSC 22 routes traffic between the PSTN 16 and thebase stations 24. Thebase stations 24 communicate with themobile stations 100 over the air interface. Thebase stations 24 forward downlink traffic and signaling from the MSC 22 to themobile stations 100, and forward uplink traffic and signaling from themobile stations 100 to the MSC 22. In some embodiments, the IS2000 may also provide packet-switched services, though this capability is not material to the present invention and is not discussed further herein. - Also shown in
FIG. 1 is an HRPD RAN 14. The HRPD RAN 14 is a high data rate (HDR) network and may be combined with an IS2000 network to provide high speed packet data services. The IS856 standard is generally known as 1xEV-DO. The HRPD RAN 14 comprises one or more access networks (ANs) 36 for communicating with themobile stations 100, and a packet core function (PCF) 34 connecting the HRPD AN 36 to a packet switched core network (PSCN) 30. The PSCN 30 includes a PDSN 32 that connects to a packet data network 18, such as the Internet. The PDSN 32 establishes communication sessions withmobile stations 100 using, for example, the point-to-point protocol (PPP). TheHRPD AN 36 forwards mobile terminated packet data from thePDSN 32 to themobile stations 100, and forwards mobile-originated packet data to thePDSN 32. - When a
mobile station 100 is operating within theIS856 network 14, themobile station 100 may still want to receive notifications from theMSC 22 relating to circuit switched services without having to periodically return to theIS2000 RAN 12 to receive such notifications. For example,mobile station 100 may want to receive paging messages over the IS856 air interface alerting themobile station 100 to incoming voice calls. To that end, theHRPD AN 36 includes a 3G1x Circuit Services Notification Application (CSNA) 42, which may be seen inFIG. 3 . Alternatively, theCSNA 42 could be located in thePCF 34. TheCSNA 42 provides circuit services notifications tomobile stations 100 over the IS856-A air interface. TheCSNA 42 uses the Circuit Services Notification (CSN) protocol. The CSN protocol also ensures that themobile station 100 stays registered with theCSCN 20 even when it is monitoring the IS856 packet data channel. TheCSNA 42 is described in cdma2000 High Rate packet Data Air Interface Specification, 3GPP2 C.20024-A, Version 1.0 (March 2004), which is incorporated herein by reference. Themobile station 100 may request circuit services notifications from theHRPD RAN 14, causing theCSNA 42 to notify theMSC 22 to send notification messages to themobile station 100 via theHRPD RAN 14. TheCSNA 42 andmobile station 100 may configure a filter that allows notifications associated with only certain circuit switched services to be sent over the IS856 air interface. - When the
mobile station 100 requests circuit services notifications from the IS856 network, theMSC 22 will be informed that themobile station 100 has requested CSNA services and will send circuit services notifications to themobile station 100 via theHRPD AN 36. TheCSNA 42 in theHRPD AN 36 receives the circuit services messages from theMSC 22, and theCSNA 42 in turn provides circuit service notifications to themobile station 100. - In some scenarios, the circuit services notification sent to the
mobile station 100 may cause themobile station 100 to transition to theIS2000 RAN 12. As one example, theCSNA 42 may receive a paging request message from theMSC 22 and send a page message to themobile station 100 responsive to the paging request message causing themobile station 100 to transition to theIS2000 RAN 12 to receive a voice call. In other scenarios, themobile station 100 may autonomously transition to theIS2000 RAN 12. For example, themobile station 100 may transition to theIS2000 RAN 12 to originate a voice call. - Under the current IS856 standards, the
mobile station 100 is not required to notify theHRPD AN 36 when it transitions to theIS2000 RAN 12. If themobile station 100 is engaged in an active packet data session, theHRPD AN 36 will continue to reserve radio resources for the active packet data session with themobile station 100. ThePDSN 32 will forward packet data to theHRPD AN 36, which will attempt to deliver the packet data to themobile station 100. TheHRPD AN 36, through the use of internal mechanisms such as inactivity timers, failed delivery attempts, etc., will eventually determine that themobile station 100 is not longer listening on the IS856 carriers and will release the radio and communication resources that have been reserved for themobile station 100. TheHRPD AN 36 may request the MSC to page the mobile station in theIS2000 RAN 12 and wait for a response from themobile station 100 before releasing resources. - When the
mobile station 100 transitions from theHRPD RAN 14 to theIS2000 RAN 12, the radio and communications resources reserved for themobile station 100 are not being used. Releasing reserved radio and communication resources as early as possible would improve overall throughput of the network, and therefore, increase system capacity. Further, releasing resources when themobile station 100 transitions to the IS2000 network can reduce accounting discrepancies. - According to the present invention, a method is provided for sending event notifications between the
IS2000 RAN 12 and theHRPD RAN 14 to more efficiently manage resources. When themobile station 100 registers with theHRPD RAN 14, it may request forwarding of circuit services notifications through theHRPD RAN 14. When theHRPD AN 36 receives a request for circuit services notifications via theHRPD RAN 14, it notifies theMSC 22 via anA1 signaling link 38 that themobile station 100 is operating within the IS 856RAN 14. TheMSC 22 stores an indication, referred to herein as the forwarding flag, indicating that themobile station 100 is operating within theHRPD RAN 14. This flag indicates that circuit services notifications should be forwarded to themobile station 100 through theHRPD RAN 14. The forwarding flag is also used to determine when event notifications should be sent by theMSC 22 to theHRPD RAN 14. When the forwarding flag is set, theMSC 22 sends event notifications to theHRPD RAN 14 responsive to certain predetermined events. - One event that may trigger an event notification is a presence event. A presence event occurs when the
IS2000 RAN 12 detects themobile station 100 after themobile station 100 has transitioned from theHRPD RAN 14. When theMSC 22 detects the presence of amobile station 100 after it has transitioned to theIS2000 RAN 12, theMSC 22 sends an event notification to theHRPD RAN 14. This situation may occur for example when themobile station 100 involved in an active packet data session in theHRPD RAN 14 receives a circuit services notification, such as a page message. Responsive to the page message or other circuit services notification, themobile station 100 transitions to theIS2000 RAN 12. Themobile station 100 could also transition to theIS2000 RAN 12 on its own initiative, for example, to initiate a voice call. When theMSC 22 detects that themobile station 100 has transitioned to theIS2000 RAN 12 and the forwarding flag is set, theMSC 22 sends an event notification message to theHRPD RAN 14 to notify theHRPD RAN 14 of the presence event. Upon receipt of the notification message from theMSC 22, theHRPD RAN 14 can release resources reserved for themobile station 100 and send an accounting update to thePDSN 32 to update accounting. In one exemplary embodiment, theHRPD RAN 14 places the packet data session in a dormant state responsive to the event notification. Thus, theHRPD RAN 14 may tear down its A8 connection and release any air interface resources reserved for the mobile station while maintaining the A10 connection to thePDSN 32. - Another event that may trigger an event notification is referred to herein as the power down event. If the
mobile station 100 powers down after transitioning to theIS2000 RAN 12, theMSC 22 may send an event notification to theHRPD RAN 14 to notify that themobile station 100 is no longer reachable. In response to the power down event notification, theHRPD RAN 14 terminates the packet data session and tear down the A10 connection to thePDSN 32. Similarly, theHRPD RAN 14 may send an event notification to theIS2000 RAN 12 when themobile station 100 powers down while present in theHRPD RAN 14. -
FIG. 2 is a call flow diagram illustrating how event notifications may be used. The call flow diagram is meant to be illustrative. Those skilled in the art will recognize that the present invention may be implemented in other procedures. Themobile station 100 establishes an active packet data call with the HRPD RAN 14 (step a). It is assumed that themobile station 100 has requested CSNA services and that theMSC 22 has set the forwarding flag as previously described. While themobile station 100 is involved in an active packet data call, theMSC 22 sends an A1 paging request to F the HRPD AN 36 (step b), and theHRPD AN 36 sends an IS2000 page message to themobile station 100 encapsulated within a IS856-A air interface message (step c). Themobile station 100 transitions to theIS2000 RAN 12 and sends an IS2000 page response encapsulated within a IS856-A air interface message (step d). TheIS2000 BS 24 receives the page response from themobile station 100, reformats the page response, and sends an A1 paging response to the MSC 22 (step e). TheMSC 22 sends an event notification to theHRPD AN 36 indicating that themobile station 100 has been detected in the IS2000 RAN 12 (step f). TheHRPD RAN 14 stops its inactivity timer and releases radio and communication resources assigned to themobile station 100. TheHRPD AN 36 also sends an accounting update to thePDSN 32 to update accounting for the packet data call (step g). At this point, the packet data call goes into a dormant state (step h). In the dormant state, theHRPD RAN 14 maintains a connection with thePDSN 32 for the packet data call but there is no communication channel established between theHRPD RAN 14 and themobile station 100. As is well known to those skilled in the art, the communication channel for the packet data call can be re-established at the initiative of either theHRPD RAN 14 or themobile station 100. Procedures for re-establishing the packet data calls are not material to the present invention. - The
mobile station 100 powers down without returning to theHRPD RAN 14. Before shutting down, themobile station 100 andMSC 22 execute a power down procedure (step i). In one exemplary procedure, themobile station 100 sends a power down indication to theIS2000 BS 24, which in turn sends a Clear Request message to theMSC 22 to initiate call clearing. TheMSC 22 sends a Clear Command message to theIS2000 BS 24, which releases the resources allocated to the mobile station and sends a Clear Complete message with a power down indicator to theMSC 22. In response to the Clear Complete message, theMSC 22 sends an event notification to the HRPD RAN 14 (step j) and theHRPD RAN 14 terminates the packet data session and releases the A10 connection to thePDSN 32. -
FIG. 3 is a flow diagram illustrating anexemplary notification procedure 60 implemented by theMSC 22. Theprocedure 60 begins when theMSC 22 receives a request from theHRPD RAN 14 to send circuit services notifications to themobile station 100 via the HRPD AN 36 (block 62). TheMSC 22 sets a forwarding flag to true (block 64). When theMSC 22 subsequently detects an event (block 66), it determines the setting of the forwarding flag (block 68). The detected event may, for example comprises a presence event, power down event, or some other event. If the forwarding flag is set to true, theMSC 22 sends theHRPD RAN 14 an event notification (block 70). The event notification includes an indication of the type of the event. TheMSC 22 responds to the event normally as specified in applicable standards (block 72) and the process ends (block 74). If the forwarding flag is set to false (block 68), theMSC 22 processes the received message from themobile station 100 normally (block 72). -
FIG. 4 illustrates an exemplaryresource management procedure 80 implemented by anHRPD RAN 14 for responding to a presence event. It is assumed that themobile station 100 has requested CSNA services and that the presence flag at theHRPD AN 36 is set to true. The procedure begins when theHRPD AN 36 receives a notification that themobile station 100 has been detected in the IS2000 RAN 12 (block 82). TheHRPD AN 36 determines if a packet data call is active (block 84). If so, theHRPD AN 36 stops its internal inactivity timer (block 86) and releases resources assigned to the mobile station 100 (block 88). Additionally, theHRPD AN 36 sends an accounting update to the PDSN 32 (block 90) and sets a presence flag equal to false (block 92). The presence flag indicates whether themobile station 100 is present and listening in theHRPD AN 36. TheHRPD AN 36 can use the presence flag to determine if it should attempt delivery of packet data over the IS856 air interface, or send a request to theMSC 22 to page themobile station 100. TheHRPD AN 36 sets the presence flag to false (block 92) and the procedure ends (block 94). -
FIG. 5 illustrates anexemplary procedure 110 implemented by theHRPD AN 36 for responding to a power down event. The procedure begins when theHRPD AN 36 receives an event notification from theMSC 22 indicating that themobile station 100 has powered down (block 112). TheHRPD AN 36 determines if a packet data call session exists (block 114). If so, theHRPD AN 36 terminates the packet data session (block 116), tears down the A10 connection to thePDSN 32, and releases radio resources (block 118). Additionally, theHRPD AN 36 may send an accounting update to the PDSN 32 (block 120) and the procedure ends (block 122). -
FIG. 6 illustrates anexemplary MSC 22 andHRPD AN 36 in more detail. TheMSC 22 includes a call control andmobility management circuit 46 for call control handling and mobility management functions, and aswitch 48 for routing user traffic. TheAN 36 includes acontroller 40 and one ormore sectors 44. Thesectors 44 contain the radio equipment for communicating with themobile stations 100. Thecontroller 40 comprises the control portion of theAN 36. Thecontroller 40 processes call control signaling and manages the radio and communication resources used by thesectors 44. Thecontroller 40 includes theCSNA 42, which may be implemented in a processor programmed to carry out the functions of theCSNA 42. TheCSNA 42 exchanges signaling with theMSC 22 and provides the circuit services notifications tomobile stations 100 over the IS856 air interface. Signaling traffic between thecontroller 40 and theMSC 22 is carried over the A1 interface. The A8 and A9 interfaces carry user traffic and signaling, respectively, between theHRPD AN 36 andPCF 34. The A13 interface transfers user traffic and signaling betweenHRPD ANs 36. - In any case, those skilled in the art should appreciate that the present invention is not limited by the foregoing discussion, nor by the accompanying figures. Rather, the present invention is limited only by the following claims and their reasonable legal equivalents.
Claims (16)
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US7606197B2 (en) | 2009-10-20 |
WO2006023225A1 (en) | 2006-03-02 |
US9832687B2 (en) | 2017-11-28 |
US9271144B2 (en) | 2016-02-23 |
US20060062207A1 (en) | 2006-03-23 |
US20160135094A1 (en) | 2016-05-12 |
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