# US 8,787,361 B2 · System and method for call routing and paging across different types of networks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,361 B2 - Document ID: US8787361B2 - Status: Granted - Kind: B2 - Application number: 13/755,690 - Filed: 2013-01-31 - Published: 2013-06-06 - Granted: 2014-07-22 - Earliest claimed: 2004-06-29 - Assignees: Intel Corporation - Applicants: Intel Corporation - Inventors: Narayan Parappil Menon; Alan Gerald Carlton - Web page: https://patentgrep.com/patent/US8787361B2 ## CPC - H04W 68/02: Arrangements for increasing efficiency of notification or paging channel - H04W 68/00: User notification, e.g. alerting and paging, for incoming communication, change of service or the like - H04W 68/12: Inter-network notification - H04W 8/06: Registration at serving network Location Register, VLR or user mobility server - H04W 8/18: Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A network architecture uses an Application Server Autonomous Access (ASAA) server which allows paging and call routing across different types of wireless and wireline access networks. The ASAA server provides connectivity between an external voice or data network and a wireless transmit/receive unit (WTRU). The external voice or data network may be a public switched telephone network (PSTN) or a public data network (PDN), so that the connectivity between the external network and the WTRU is provided through the access networks using data from the ASAA server. ## Claims ### Claim 1 A wireless transmit/receive unit (WRTU) comprising: first interface circuitry configured to access a service of a public network via a server over a first access network; and second interface circuitry configured to switch networks to a second access network different than the first access network, wherein an access technology of the first access network is different from access technology of the second access network; receive a page from the server over the second access network; transmit a response to the page over the second access network; and continue to access the service of the public network via the server over the second access network. ### Claim 2 (depends on 1) The WRTU of claim 1, wherein the server comprises an Application Server Autonomous Access (ASAA) server. ### Claim 3 (depends on 1) The WRTU of claim 1, wherein the public network comprises a public switched telephone network (PSTN) or a public data network (PDN). ### Claim 4 (depends on 1) The WRTU of claim 1, wherein the second interface circuitry is configured to transmit the response including indicating the second access network to the server. ### Claim 5 (depends on 1) The WRTU of claim 1, wherein the second interface circuitry is configured to transmit the response including a message indicating availability of the WRTU to access the second access network. ### Claim 6 (depends on 1) The WRTU of claim 1, wherein the first interface circuitry and the second interface circuitry are configured to connect to the server, which maintains a fixed point of connection to the public network as the WRTU switches between the first access network and the second access network. ### Claim 7 (depends on 1) The WRTU of claim 1, wherein the second interface circuitry is further configured to receive the paging request and transmit the response using Internet Protocol (IP). ### Claim 8 A method comprising: accessing a service of a public network, by a wireless transmit/receive unit (WRTU), via a server over a first access network; switching networks by the WRTU to a second access network different than the first access network, wherein an access technology of the first access network is different from access technology of the second access network; receiving a page from the server over the second access network; transmitting a response to the page over the second access network; and continuing to access the service of the public network via the server over the second access network. ### Claim 9 (depends on 8) The method of claim 8, wherein the server comprises an Application Server Autonomous Access (ASAA) server. ### Claim 10 (depends on 8) The method of claim 8, wherein accessing the service comprises exchanging data via the server with a public switched telephone network (PSTN) or a public data network (PDN). ### Claim 11 (depends on 8) The method of claim 8, wherein transmitting the response further comprises sending a message indicating the second access network to the server. ### Claim 12 (depends on 8) The method of claim 8, wherein transmitting the response further comprises sending a message indicating availability of the WRTU to access the second access network. ### Claim 13 (depends on 8) The method of claim 8, wherein accessing the service via the second access network further comprises the server maintaining a fixed point of connection to an external network as the WRTU switches between the first access network and the second access network. ### Claim 14 (depends on 8) The method of claim 8, wherein the receiving the paging request and transmitting the response comprises exchanging messages using Internet Protocol (IP). ### Claim 15 A method comprising: transmitting a paging request to a wireless transmit/receive unit (WRTU), the paging request transmitted by a server via a first access network and a second access network different from the first access network, wherein an access technology of the first access network is different from access technology of the second access network, wherein the WRTU accesses a service of a public network via the server over the first access network; receiving a response to the paging request via the second access network from the WRTU; and routing data for the service to the WRTU via the second access network. ### Claim 16 (depends on 15) The method of claim 15, wherein the server comprises an Application Server Autonomous Access (ASAA) server. ### Claim 17 (depends on 15) The method of claim 15, wherein the public network comprises a public switched telephone network (PSTN) or a public data network (PDN) connected to the server. ### Claim 18 (depends on 15) The method of claim 15, wherein receiving the response further comprises receiving a message indicating availability of the WRTU to access the second access network. ### Claim 19 (depends on 15) The method of claim 15, further comprising maintaining a fixed point of connection to the service of the public network as the WRTU changes between the first access network and the second access network.