System and method for facilitating roaming of push to talk subscribers across disparate dispatch networks

• US 20060058008A1
• Filed: 09/09/2005
• Published: 03/16/2006
• Est. Priority Date: 09/09/2004
• Status: Active Grant

• Current Assignee: Nextel Communications (Deutsche Telekom AG)
• Original Assignee: Nextel Communications (Deutsche Telekom AG)
• Inventors: Choksi, Ojas Thakor
• Granted Patent: US 7,702,346 B2
• Time in Patent Office: Days
• US Class Current: 455/406
• CPC Class Codes: H04W 4/10 Push-to-Talk [PTT] or Push-On-Call services
• CPC Class Codes: H04W 76/45 for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services
• CPC Class Codes: H04W 8/02 Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks

Abstract

An inter-working network facilitating PTT communications among roaming subscribers spanning a plurality of disparate dispatch networks includes a signaling controller, a media gateway, a system for facilitating the monetization of inter-carrier dispatch communications and a group management server. The signaling controller and media gateway generate dispatch call records for dispatch sessions facilitated through the inter-working network. The system includes a billing accumulator and a settlement entity. The billing accumulator is interfaced with the inter-working network and includes logic to receive and store the dispatch call data records from the inter-working architecture. The settlement entity is interfaced with the billing accumulator, and includes settlement logic for converting each stored dispatch call data record to a billing record for each of at least two of the dispatch networks. The group management server is interfaced with group management servers in each of the dispatch networks.

Claims

1. A network for inter-working a plurality of dispatch networks, at least two of the dispatch networks having incompatible technologies, the network comprising:

a core inter-working network;

a plurality of points-of-presence (POPs) connected to the core inter-working network; and

a plurality of border gateways interfacing each of the dispatch networks to at least one of the plurality of points-of-presence;

wherein the points-of-presence facilitate roaming of subscribers on the dispatch networks.

2. The network of claim 1 wherein the core inter-working network further includes a centralized database storing call detail records and usage data reports relating to dispatch sessions including at least one roaming subscriber;

and

a billing clearinghouse for receiving the call detail records and usage data reports and generating invoices for each of the dispatch networks, including roaming charges for the roaming subscriber.

3. The network of claim 1 wherein at least one point-of-presence includes a signaling bridge adapted to translate dispatch session messages received from an originating dispatch network into a common signaling format before session processing;

and

wherein at least one point-of-presence is adapted to translate signals from the common signaling format into a format compatible with a target dispatch network.

4. The network of claim 1 wherein the at least one point-of-presence further includes a proxy server adapted to receive an incoming dispatch request from a roaming subscriber on the originating dispatch network and determine whether translation is required between signaling formats of the originating and target dispatch networks, wherein translation by the signaling bridge is performed when the proxy server determines that translation is required, and wherein dispatch session messages are not translated by the signaling bridge when the proxy server determines that translation is not required.

5. The network of claim 1 wherein a first of the dispatch networks is an iDEN network and a second of the dispatch networks is a QChat network, and wherein the network is adapted to facilitate dispatch communications between roaming subscribers on the iDEN network and roaming subscribers on the QChat network.

6. An inter-working architecture for facilitating dispatch communications between a plurality of dispatch devices, including at least one roaming device, each operating on one of a plurality of dispatch networks, each having a separate administrative domain and operating on at least one of a plurality of technologies, comprising:

a plurality of interfaces facilitating communications with each of the dispatch networks;

a signaling bridge adapted to convert session messages and signaling messages between the plurality of dispatch networks;

a signaling controller interfaced with the signaling bridge, the signaling controller adapted to manage a dispatch session between an originating dispatch network and at least one target dispatch network; and

a media gateway interfaced with the signaling controller, the media gateway adapted to convert real-time media between the originating dispatch network and the target dispatch network;

wherein all communications with an inter-working roaming subscriber are routed through the inter-working architecture.

7. The inter-working architecture of claim 6 further comprising a proxy server interfaced with the signaling bridge and the signaling controller, the proxy server adapted to facilitate a communication between the originating and target dispatch networks without translation when the originating and target dispatch networks use compatible dispatch technologies, wherein the proxy server routes an incoming dispatch session to the signaling bridge for translation when the originating and target dispatch networks use incompatible technologies.

8. The inter-working architecture of claim 6 wherein the interfaces include a border gateway that manages communications between the inter-working architecture and the dispatch networks.

9. The inter-working architecture of claim 6 further comprising a billing clearinghouse adapted to collect call data for a dispatch session between two or more dispatch networks, reconcile the collected data and create inter-working invoices for the dispatch session, including roaming charges for the at least one roaming device.

10. The inter-working architecture of claim 9 wherein the signaling controller facilitates the storage of call data records, in a regional database, associated with a dispatch call between two or more of the dispatch networks, and wherein the billing clearinghouse uses the stored call detail records to create inter-working invoices.

11. The inter-working architecture of claim 9 wherein the media gateway facilitates the storage of usage detail reports associated with the roaming subscriber, wherein the billing clearinghouse uses the stored usage detail reports to create inter-working invoices for the dispatch networks, wherein the dispatch networks include at least a home network and a visited network for each roaming session.

12. The inter-working architecture of claim 11 wherein the border gateway facilitates the storage of usage detail reports associated with inbound and outbound traffic between the dispatch networks.

13. A method for monetizing inter-working of a plurality of disparate dispatch networks, each dispatch network providing dispatch services to a plurality of subscriber units, including roaming subscribers from other dispatch networks, comprising the steps of:

receiving a dispatch session request from an originating dispatch network, the dispatch session request identifying a group of the subscriber units spanning a plurality of target dispatch networks, wherein an originating subscriber unit is roaming on the originating dispatch network;

processing, in a point-of-presence, the dispatch session request, including allocating signaling and media resources;

forwarding the dispatch session request to a border gateway associated with each of the target dispatch networks;

facilitating the group session between the originating dispatch network and the target dispatch networks, wherein all communications between participating subscriber units are routed through a central network; and

generating an invoice for each of the originating dispatch network and target dispatch networks, including charges for facilitating the group session.

14. The method of claim 13 wherein signaling resources are allocated in a plurality of points-of-presence, each point-of-presence generating dispatch call data records and usage data records for the group session.

15. The method of claim 13 wherein the signaling resources are allocated in a first point-of-presence and media resources are allocated in a second point-of-presence, each point-of-presence generating dispatch call data for the group session.

16. The method of claim 14 further comprising aggregating the generated dispatch call data and usage data for the group session and applying settlement logic to the aggregated dispatch call data to produce billing data for each of the originating dispatch network and the target dispatch networks.

17. The method of claim 15 wherein the settlement logic includes a set of criteria comprising at least one of a number of PTT button pushes requesting a session floor, a number of regions, a size of participating carriers, a group size for the session, a number of carriers involved in the session, a number of bytes transmitted, an identity of transcoding resources allocated, and an identify and duration of inter-working applications used.

18. The method of claim 16 further comprising:

receiving a request for an inter-working application; and

executing the inter-working application during the session,

wherein the invoice includes charges for the use of the inter-working application.