# US 9,521,612 B2 · Notifying availability of internet protocol multimedia subsystem services > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,612 B2 - Document ID: US9521612B2 - Status: Granted - Kind: B2 - Application number: 14/488,049 - Filed: 2014-09-16 - Published: 2016-01-28 - Granted: 2016-12-13 - Earliest claimed: 2014-07-23 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Debesh Kumar Sahu; Naresh Gundu; George Cherian - Web page: https://patentgrep.com/patent/US9521612B2 ## CPC - H04W 48/20: Selecting an access point - H04L 65/1016: IP multimedia subsystem [IMS] - H04L 65/1073: Registration or de-registration - H04W 40/244: {using a network of reference devices, e.g. beaconing} - H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) - H04W 48/18: Selecting a network or a communication service - H04W 60/005: {Multiple registrations, e.g. multihoming} - H04W 74/04: Scheduled access (hybrid access H04W74/02) - H04W 36/1446: {wherein at least one of the networks is unlicensed} - H04W 84/042: {Public Land Mobile systems, e.g. cellular systems} - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - H04W 88/10: adapted for operation in multiple networks, e.g. multi-mode access points - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Methods, systems, and devices are described for indicating, by a multimode access point, an availability of a service on a first RAT to a mobile device via a second RAT. The multimode access point may determine whether a service is available from a base station on the first RAT, e.g., a VoLTE service from a LTE base station. The multimode access point may send an indication to the mobile device of the available services. The mobile device may configure a voice call session based on the available services and initiate the voice call session accordingly. ## Claims ### Claim 1 A method for wireless communication, comprising: determining, by a multimode access point, that a service is available for a mobile device and that a first of a plurality of radio access technologies (RATs) is active for a backhaul connection to provide the service; and providing, to the mobile device via a second radio access technology (RAT), an indication that the service is available and that the first of the plurality of RATs is active for the backhaul connection to provide the service. ### Claim 2 (depends on 1) The method of claim 1, wherein providing the indication that the service is available comprises: sending a beacon to the mobile device via the second RAT. ### Claim 3 (depends on 2) The method of claim 2, wherein the beacon comprises a first information element indicative of the first RAT being active for the backhaul connection to provide the service and a second information element indicative of the service being available on the first RAT. ### Claim 4 (depends on 3) The method of claim 3, wherein the first RAT is a cellular communications network and the service is a voice over Long Term Evolution (LTE) (VoLTE) service. ### Claim 5 (depends on 1) The method of claim 1, wherein determining that the service is available comprises: intercepting a message from a network entity to the mobile device; modifying an information element included in the message to indicate availability of the service on the first RAT; and forwarding the message with the modified information element to the mobile device. ### Claim 6 (depends on 5) The method of claim 5, wherein the message comprises a general advertisement service initial response message. ### Claim 7 (depends on 5) The method of claim 5, wherein the information element is a connection capability information element. ### Claim 8 (depends on 1) The method of claim 1, wherein the first RAT comprises a cellular communications network and the second RAT comprises a wireless local area network. ### Claim 9 (depends on 1) The method of claim 1, wherein the service is a semi-persistent scheduling service. ### Claim 10 An apparatus for wireless communication, comprising: a service manager configured to determine, by a multimode access point, that a service is available for a mobile device and that a first of a plurality of radio access technology (RATs) is active for a backhaul connection to provide the service; and a transmitter configured to provide, to the mobile device via a second radio access technology (RAT), an indication that the service is available and that the first of the plurality of RATs is active for the backhaul connection to provide the service. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein the transmitter configured to provide the indication that the service is available is further configured to: send a beacon to the mobile device via the second RAT. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the beacon comprises a first information element indicative of the first RAT being active for the backhaul connection to provide the service and a second information element indicative of the service being available on the first RAT. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the first RAT is a cellular communications network and the service is a voice over Long Term Evolution (LTE) (VoLTE) service. ### Claim 14 (depends on 10) The apparatus of claim 10, wherein the service manager is configured to determine that the service is available is further configured to: intercept a message from a network entity to the mobile device; and modify an information element included in the message to indicate availability of the service on the first RAT; and wherein the transmitter is further configured to forward the message with the modified information element to the mobile device. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein the message comprises a general advertisement service initial response message. ### Claim 16 (depends on 14) The apparatus of claim 14, wherein the information element is a connection capability information element. ### Claim 17 (depends on 10) The apparatus of claim 10, wherein the first RAT comprises a cellular communications network and the second RAT comprises a wireless local area network. ### Claim 18 (depends on 10) The apparatus of claim 10, wherein the service is a semi-persistent scheduling service.