{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-9635642","patent":{"patent_number":"US-9635642","title":"Method and apparatus for transmitting/receiving CSI-RS operating in massive MIMO system FDD mode","assignee":null,"inventors":[],"filing_date":"2012-12-27T00:00:00.000Z","publication_date":"2017-04-25T00:00:00.000Z","cpc_codes":["H04W","H04B","H04B","H04B","H04L","H04L","H04L","H04L","H04L","H04L","H04L","H04L"],"num_claims":16,"abstract":"Methods and apparatus are provided for beamforming and information feedback are provided. Signals for beams to be transmitted through corresponding antenna ports, are generated. The beams are formed by precoding the signals with beamforming vectors. The beams are sorted into a number of resource reuse groups based on a resource that is to be shared. The beams are transmitted, using resources allocated per group, to a receiver. Feedback information is generated on at least one antenna port, based on the received beams. The feedback information is transmitted to the transmitter. A beam is selected having a greatest gain for a transmitter using the feedback information. A transmission resource is allocated for the selected beam."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Method and apparatus for transmitting/receiving CSI-RS operating in massive MIMO system FDD mode","description":"Methods and apparatus are provided for beamforming and information feedback are provided. Signals for beams to be transmitted through corresponding antenna ports, are generated. The beams are formed b","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-9635642","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-9635642","citation_suggestion":"Patentable. \"Method and apparatus for transmitting/receiving CSI-RS operating in massive MIMO system FDD mode\" (US-9635642). https://patentable.app/patents/US-9635642","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-9635642","json":"https://patentable.app/api/llm-context/US-9635642","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-06-06T06:00:01.862Z"}