Service-dependent routing of a mobile-terminating call in a mobile communication system
First Claim
1. A visitor location register (VLR) for a mobile communication system, the visitor location register being arranged to, as a response to a roaming number request received from a home location register (HLR), allocate a roaming number to a call terminating at a mobile station (MS) within an area of a mobile switching centre associated with the visitor location register, and to send the allocated roaming number via the home location register (HLR) to a routing exchange (GMSC, EXC) to be used for routing the call to said mobile switching centre (MSC), characterized in that the allocated roaming number (MSRN) contains a part (SERVN) which is dependent on the service required by the call and the value of which indicates of two or more different transmission routes (ROUTE13 1, ROUTE13 2) the one via which the call is to be routed to said mobile switching centre (MSC).
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Accused Products
Abstract
The present invention relates to service-dependent routing of a mobile-terminating call in a mobile communication system employing a multinumbering scheme. A visitor location register (VLR), as a response to a roaming number request from a home location register (HLR), allocates a roaming number to the call and the roaming number is returned to the HLR and further to a routing exchange (GMSC, EXC) to be used for routing the call to the mobile switching centre (MSC) associated with the VLR. In some cases there may be two different alternative transmission routes between the routing exchange (GMSC) and the MSC. In order to enable the routing exchange to select the appropriate one of these transmission routes for routing the call to the MSC, the roaming number (MSRN) allocated by the VLR contains a part (SERVN) which is dependent on the service required by the call and indicates the appropriate one of the transmission routes (ROUTE-- 1, ROUTE-- 2).
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Citations
12 Claims
- 1. A visitor location register (VLR) for a mobile communication system, the visitor location register being arranged to, as a response to a roaming number request received from a home location register (HLR), allocate a roaming number to a call terminating at a mobile station (MS) within an area of a mobile switching centre associated with the visitor location register, and to send the allocated roaming number via the home location register (HLR) to a routing exchange (GMSC, EXC) to be used for routing the call to said mobile switching centre (MSC), characterized in that the allocated roaming number (MSRN) contains a part (SERVN) which is dependent on the service required by the call and the value of which indicates of two or more different transmission routes (ROUTE13 1, ROUTE13 2) the one via which the call is to be routed to said mobile switching centre (MSC).
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4. A mobile communication system comprising a mobile switching centre (MSC), a visitor location register (VLR) associated with said mobile switching centre, a home location register (HLR), a gateway mobile switching centre (GMSC) and a transmission system comprising at least two different alternative transmission routes (ROUTE13 1, ROUTE13 2) between the mobile switching centre (MSC) and the gateway mobile switching centre (GMSC), and that
the gateway mobile switching centre (GMSC) is arranged to make a database inquiry into the home location register (HLR) upon receiving a terminating call to a mobile subscriber'"'"'s directory number, the home location register (HLR) is arranged to request the roaming number (MSRN) of the visitor location register (VLR) within which the mobile subscriber is located, and indicate in the request the services determined by the directory number, the visitor location register (VLR) is arranged to allocate a roaming number (MSRN) to the call and send it as a response to the home location register, the home location register (HLR) is arranged to send the roaming number to the gateway mobile switching centre, the gateway mobile switching centre (GMSC) is arranged to route the call on the basis of the routing information contained in the roaming number to the mobile switching centre (MSC), characterized in that the allocated roaming number contains a part (SERVN) which is dependent on the service required by the call and indicates of two or more different transmission routes (ROUTE13 1, ROUTE13 2) the one via which the call is to be routed from the GMSC to the mobile switching centre.
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8. A method for routing a mobile-terminating call in a mobile communication system comprising a mobile switching centre, a visitor location register associated with the mobile switching centre, a home location register, a gateway mobile switching centre and a transmission system comprising at least two different alternative transmission routes between the mobile switching centre and the gateway mobile switching centre, the method comprising the steps of
receiving at the gateway mobile switching centre a mobile-terminating call addressed to a mobile subscriber'"'"'s directory number, making a database inquiry from the gateway mobile switching centre to the home location register, sending a roaming number request from the home location register to the visitor location register within which the mobile subscriber is located, and indicating in the request the services of the call defined by the directory number, allocating a roaming number to the call in the visitor location register and sending it as a response to the home location register, sending a roaming number from the home location register to the gateway mobile switching centre, routing the call on the basis of routing information contained in the roaming number from the gateway mobile switching centre to the mobile switching centre, characterized by allocating a roaming number dependent on the service required by the call in the visitor location register, routing the call from the gateway mobile switching centre to the mobile switching centre via one of said alternative transmission routes selected according to the service-dependent roaming number.
Specification