{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8504043","patent":{"patent_number":"US-8504043","title":"Method, apparatus, and system for voice call fallback to circuit switched domain","assignee":null,"inventors":[],"filing_date":"2012-01-23T00:00:00.000Z","publication_date":"2013-08-06T00:00:00.000Z","cpc_codes":["H04W","H04W","H04W","H04W","H04W","H04W"],"num_claims":8,"abstract":"A method for voice call fallback to a circuit switched (CS) domain disclosed in the present invention includes: receiving a Service Request message from a calling user equipment (UE), where the Service Request message includes called number information of a voice call in a CS domain, instructing an evolved NodeB (eNB) to initiate circuit switched fallback (CSFB) handover; receiving a Handover Request message from the eNB, where the Handover Request message includes information required for CS handover, selecting a mobile switching center (MSC) and sending a packet switched (PS) to CS Handover Request message to the MSC, where the PS to CS Handover Request message carries information required for the CS handover and a called number so that the MSC calls a called UE. The corresponding apparatuses and systems are also disclosed. The technical solution of the present invention can reduce the connection delay."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Method, apparatus, and system for voice call fallback to circuit switched domain","description":"A method for voice call fallback to a circuit switched (CS) domain disclosed in the present invention includes: receiving a Service Request message from a calling user equipment (UE), where the Servic","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8504043","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-8504043","citation_suggestion":"Patentable. \"Method, apparatus, and system for voice call fallback to circuit switched domain\" (US-8504043). https://patentable.app/patents/US-8504043","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8504043","json":"https://patentable.app/api/llm-context/US-8504043","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-30T22:14:32.713Z"}