# US 8,571,520 B1 · Notifying a wireless communication system about previously registered wireless communication systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,571,520 B1 - Document ID: US8571520B1 - Status: Granted - Kind: B1 - Application number: 12/719,937 - Filed: 2010-03-09 - Granted: 2013-10-29 - Earliest claimed: 2010-03-09 - Assignees: Sprint Communications Company L.P. - Applicants: Debashis Haldar - Inventors: Debashis Haldar - Web page: https://patentgrep.com/patent/US8571520B1 ## CPC - H04W 60/00: Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration - H04M 1/66: with means for preventing unauthorised or fraudulent calling (verifying user identity or authority in secret or secure digital communications H04L9/32) - H04M 1/68: Circuit arrangements for preventing eavesdropping - H04M 3/16: with lock-out or secrecy provision in party-line systems - H04W 8/14: between corresponding nodes - 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) - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) ## Abstract Embodiments disclosed herein provide systems and methods that notify a current wireless communication network about a previous wireless communication network. In a particular embodiment, a wireless device wirelessly registers with a first wireless communication system to obtain first registration data. The wireless device stores the first registration data and wirelessly communicates over the first wireless communication system. The communications are then terminated with the first wireless communication system. After terminating the wireless communications with the first wireless communication system, the wireless device wirelessly registers with a second wireless communication system to obtain second registration data and stores the second registration data. The wireless device transfers the first registration data to the second wireless communication system and receives user information from the second wireless communication system. The second wireless communication system used the first registration data to retrieve the user information from the first wireless communication system. ## Claims ### Claim 1 A method of operating a communication system comprising: in a wireless communication device, wirelessly registering with a first wireless communication network to receive first registration data from a first authorization system for the first wireless communication network, storing the first registration data, wirelessly communicating over the first wireless communication network, and terminating the wireless communications with the first wireless communication network; in the wireless communication device, after terminating the wireless communications with the first wireless communication network, wirelessly registering with a second wireless communication network to receive second registration data from a second authorization system for the second wireless communication network, storing the second registration data, and wirelessly transferring the first registration data to the second wireless communication network; in the wireless communication device, wirelessly receiving user information from the second wireless communication network, wherein the second authorization system used the first registration data to retrieve the user information from the first wireless communication network. ### Claim 2 (depends on 1) The method of claim 1 wherein terminating the wireless communications with the first wireless communication network comprises powering off the wireless communication device. ### Claim 3 (depends on 1) The method of claim 1 wherein terminating the wireless communications with the first wireless communication network comprises losing wireless connectivity with the first wireless communication network. ### Claim 4 (depends on 1) The method of claim 1 wherein wirelessly transferring the first registration data to the second wireless communication network occurs when wirelessly registering with the second wireless communication network. ### Claim 5 (depends on 1) The method of claim 1 further comprising, in the second wireless communication network, wirelessly receiving the first registration data, processing the first registration data and the second registration data to query the first wireless communication network for the user information, receiving the user information from the first wireless communication network, and wirelessly transferring the user information to the wireless communication device. ### Claim 6 (depends on 1) The method of claim 1 wherein the second authorization system comprises an Authentication, Authorization, and Access (AAA) system. ### Claim 7 (depends on 1) The method of claim 1 wherein at least one of the first and second wireless communication networks is a Code Division Multiple Access (CDMA) network. ### Claim 8 (depends on 1) The method of claim 1 wherein at least one of the first and second wireless communication networks is a Worldwide Interoperability for Microwave Access (WiMAX) network. ### Claim 9 A wireless device comprising: a communication interface configured to wirelessly register with a first wireless communication network to receive first registration data from a first authorization system for the first wireless communication network, wirelessly communicate over the first wireless communication network, and terminate the wireless communications with the first wireless communication network; the communication interface further configured to, after the wireless communications with the first wireless communication network are terminated, wirelessly register with a second wireless communication network to obtain second registration data from a second authorization system for the second wireless communication network, wirelessly transfer the first registration data to the second wireless communication network, and receive user information from the second wireless communication network, wherein the second authorization system used the first registration data to retrieve the user information from the first wireless communication network; a processing system configured to store the first and second registration data in a storage system. ### Claim 10 (depends on 9) The wireless device of claim 9 wherein termination of the wireless communications with the first wireless communication network comprises powering off the wireless communication device. ### Claim 11 (depends on 9) The wireless device of claim 9 wherein termination of the wireless communications with the first wireless communication network comprises losing wireless connectivity with the first wireless communication network. ### Claim 12 (depends on 9) The wireless device of claim 9 wherein the communication interface is configured to wirelessly transfer the first registration data to the second wireless communication network when wirelessly registering with the second wireless communication network. ### Claim 13 (depends on 9) The wireless device of claim 9 wherein the second wireless communication network wirelessly receives the first registration data, processes the first registration data and the second registration data to query the first wireless communication network for the user information, receives the user information from the first wireless communication network, and wirelessly transfers the user information to the wireless device. ### Claim 14 (depends on 9) The wireless device of claim 9 wherein the second authorization system comprises an Authentication, Authorization, and Access (AAA) system. ### Claim 15 (depends on 9) The wireless device of claim 9 wherein at least one of the first and second wireless communication networks is a Code Division Multiple Access (CDMA) network. ### Claim 16 (depends on 9) The wireless device of claim 9 wherein at least one of the first and second wireless communication networks is a Worldwide Interoperability for Microwave Access (WiMAX) network. ### Claim 17 A communication system comprising: a wireless communication device configured to wirelessly register with a first wireless communication network to receive first registration data from a first authorization system for the first wireless communication network, store the first registration data, wirelessly communicate over the first wireless communication network, and terminate the wireless communications with the first wireless communication network; the wireless communication device further configured, after terminating the wireless communications with the first wireless communication network, to wirelessly register with a second wireless communication network to receive second registration data from a second authorization system for the second wireless communication network, store the second registration data, and wirelessly transfer the first registration data to the second wireless communication network; the second wireless communication network configured to wirelessly register the wireless communication device, and transfer the second registration data, wirelessly receive the first registration data, process the first registration data and the second registration data to query the first wireless communication network for the user information, receive the user information from the first wireless communication network, and wirelessly transfer the user information to the wireless communication device. ### Claim 18 (depends on 17) The communication system of claim 17 wherein termination of the wireless communications with the first wireless communication network comprises powering off the wireless communication device. ### Claim 19 (depends on 17) The communication system of claim 17 wherein termination of the wireless communications with the first wireless communication network comprises losing wireless connectivity with the first wireless communication network. ### Claim 20 (depends on 17) The communication system of claim 17 wherein the wireless communication device is configured to wirelessly transfer the first registration data to the second wireless communication network when wirelessly registering with the second wireless communication network.