{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9848358","patent":{"patent_number":"US-9848358","title":"Apparatus to enable fallback to circuit switched domain from packet switched domain","assignee":null,"inventors":[],"filing_date":"2013-11-01T00:00:00.000Z","publication_date":"2017-12-19T00:00:00.000Z","cpc_codes":["H04W","H04W","H04W","H04W"],"num_claims":20,"abstract":"An apparatus is used to perform a Circuit Switched (CS) fallback in wireless communications. The Non-Access Stratum (NAS) of the apparatus determines whether to perform a CS fallback based on an Internet Protocol (IP) Multimedia Subsystem (IMS) registration status, and sends a service request indicating a request to perform the CS fallback when the WTRU is attached to a CS domain. The apparatus also includes an Access Stratum (AS) that receives the CS service request from the NAS, sends an indication of the CS service request in a Radio Resource Control (RRC) message to an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN), wherein the RRC message includes CS service information, and receives a handover command in response to the CS service request."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Apparatus to enable fallback to circuit switched domain from packet switched domain","description":"An apparatus is used to perform a Circuit Switched (CS) fallback in wireless communications. The Non-Access Stratum (NAS) of the apparatus determines whether to perform a CS fallback based on an Inter","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9848358","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-9848358","citation_suggestion":"Patentable. \"Apparatus to enable fallback to circuit switched domain from packet switched domain\" (US-9848358). https://patentable.app/patents/US-9848358","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9848358","json":"https://patentable.app/api/llm-context/US-9848358","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T07:00:11.432Z"}