Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2000-09-11
2004-04-20
Tran, Sinh (Department: 2681)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S435100, C455S432100, C455S410000, C709S249000, C370S409000
Reexamination Certificate
active
06725037
ABSTRACT:
BACKGROUND OF THE INVENTION
People like to communicate. They do it over wires, transmitting their voices and data over a wire or line, using telephones and similar devices (facsimile, computer modem) that are present in our homes, offices, schools, businesses, etc. and that connect to the public switched telephone network (PSTN) through wireline (also referred to as landline). Humans also communicate via wireless. Wireless communications are transmitted through radio frequency (RF) technology. Wireless communications include communications that are transmitted via cellular telephones, mobile telephones, car phones, personal communication service (PCS) units, pagers, Palmpilots™ and the like.
Communications, whether wired or wireless, are not free. People must pay for their use of the network, or the network operators will not have the money to run the network, improve the network, etc. Many people do not like to pay for their communications, however, and have devised many and devious ways of circumventing payment. The incentive to do so is especially high when the communicating person is “roaming” or using the facilities of a network in another service area that is served by a different service provider with whom the subscriber has no business relationship. When “roamers” or others using a network do not pay for that use, it is called fraud (although one could more clearly call this theft).
The present invention provides a process for validating roamers, particularly international roamers, in such a way as to decrease fraud. The process applies to cell phones and to PCS phones that operate under various standards, such as Advanced Mobile Phone Service (AMPS), Call Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), etc. Nonetheless, the principals of the present invention may be applied to other communication devices operating under other standards with the appropriate reconfiguration.
General Description of Wireless Communication
With a wireless unit, a subscriber (e.g., a person who obtains wireless communications service from a service provider) may make or receive communications, which term refers to any call, message, announcement or other exchange of data or information, whether analog or digital, that may be received on or transmitted from a wireless unit, whether a stand-alone unit or integrated into other devices. When a subscriber initiates a communication on a wireless unit, a base station serving a predetermined geographic area wherein the subscriber is located receives the communication. This area is called a cell. A base station usually serves only one or a few cells. Other base stations serve other cells of a larger service area, which encompasses the geographic area that includes all of the cells to which the carrier provides wireless communications services. The service provider typically operates a wireless communications network or system to provide wireless communications service to the geographic area. The wireless communications network or system includes the referenced base stations, and other elements such as mobile switching centers (MSCs), and other network elements referenced below. The wireless communications network also includes elements that interface with the wireline PSTN and other networks to provide communications between and among wireless or wireline devices.
Upon receipt of a communication from a wireless unit, the base station transmits the communication to a mobile switching center (MSC). An MSC in a wireless communications system may be analogized to a central office in the PSTN. The MSC further routes the communication as appropriate, possibly to and through the PSTN, the same wireless communications system, another wireless communications system, or combinations thereof.
In addition to making a call, a subscriber may receive a communication on his or her wireless unit from a caller. The caller communicates to the number associated with the subscriber's wireless unit, which is referred to herein as the mobile number of the wireless unit. The mobile number may be the mobile identification number (MIN) of the wireless unit. The communication is routed through the PSTN, other networks, and/or wireless communications systems until the communication reaches the MSC serving the subscriber's wireless unit. This MSC then further routes the communication to the wireless unit.
Roaming
A wireless device is particularly useful to a person on the move. For example, you can use a wireless unit while driving. A service provider or carrier provides the wireless communications service to your mobile wireless unit. But a subscriber's mobility may take him out of the service area served by his service provider. If the new area is served by a different service provider with whom the subscriber has no business relationship, the subscriber is said to be “roaming” out of the home service area and is called a “roamer” in a visited service area. To provide a roamer with communications service, service providers have agreed to follow certain procedures in processing communications of each other's subscribers. Generally, the service provider for the visited system validates a roaming subscriber. Validation (as well as a related process called authentication) aims to minimize fraudulent use of wireless units.
As shown in
FIG. 1
, generally in validation, when a wireless unit initiates a communication in a visited service area, the visited system service provider attempts to find the wireless unit's identification (also referred to as registration information) in the visitor location register (VLR) of an appropriate MSC in the visited system (MSC-V). If the VLR lacks the required information, it queries the roamer's home location register (“HLR”) in the roamer's home system via a registration notification “REGNOT” request, which includes the wireless unit's identification (e.g., mobile number, its electronic serial number (ESN), and/or mobile identification number (MIN)). Typically, if the roamer's service provider is domestic, the VLR sends the query directly to the HLR; if the roamer's service providers is a non-North American carrier, the REGNOT request is routed through a Service Control Point (“SCP”) to the roamer's HLR.
The HLR examines the wireless unit's identification to determine if it is valid. If so, then the HLR validates the wireless unit with a message to the serving VLR in the visited system, with settings indicating whether the subscriber can be served at all or partially (e.g., calls to the subscriber allowed, but the subscriber cannot originate calls, or vice versa). After the serving VLR in the visited system receives that message, it lets the subscriber use the local network. The VLR of the serving MSC may then temporarily store the visiting wireless unit's information to validate the identity of the wireless unit rather than requesting validation from the home system again for the next call.
If the wireless unit is invalid, then the HLR of the home system informs the serving VLR in the visited system. After the serving MSC in the visited system receives the notification that the visiting wireless unit is invalid, the visiting wireless unit may be provided with an announcement denying service or other steps may be taken. Generally, the communication initiated by an invalid visiting wireless unit is not processed.
Sometimes an HLR does not answer the REGNOT request from the SCP, resulting in no responsive message from the SCP back to the VLR. This is rather rare in North American networks. As a result, North American networks and service providers generally program their VLRs to allow the roamer service even when getting back no response from the roamer's HLR.
Sometimes, however, a non-North American carrier serves a roamer that is roaming in North America. Connections among North American networks and the roamer's home network may be subject to more downtime for numerous reasons. As a result, non-North American roamers may generate more occasions wh
Afshar Kamran
BellSouth Intellectual Property Corporation
Cantor & Colburn LLP
Tran Sinh
LandOfFree
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