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Standards-Essential WiFi Patents Free of FRAND Obligations    

Patents Cover Essential Aspects of 802.11n and 802.11ac


This portfolio covers essential technologies implemented in the 802.11n and 802.11ac WiFi standards.

The 802.11n/ac standards use orthogonal frequency division multiplexing as well as multiple-input multiple-output (MIMO) technology both of which compensate for multi-path transmission effects that occur from radio frequency (RF) line of sight (LOS) and RF non-LOS transmission paths, such as occur in multi-room buildings. OFDM technology provides adequate symbol width and guard intervals so as to alleviate inter symbol interference (ISI) effects such as can occur due to multi-path, reflection and absorption phase induced losses. When using broadcast/multicast transmission 802.11n/ac devices do not expect acknowledgement (ACK) messages from the end-users devices upon successful reception of packets, however proper configuration of multicast rate is often useful to ensure maximum data throughput.

Patent Summary

U.S. Patent Classes & Classifications Covered in this listing:

Class 725: Interactive Video Distribution Systems

This class contains interactive video distribution processes, systems, and elements thereof, which are characterized by point-to-multipoint system configurations, and which are used for the unidirectional distribution or delivery of motion video data resulting from interactions between systems operators (access or service providers) or users (subscribers) and systems elements. These systems include dedicated communications systems, such as television distribution systems, which primarily distribute or deliver motion video data in the manner indicated, but which may, in addition, provide a framework for further, diverse data communications or services in either unidirectional or bidirectional form. Typically, system operators interface with transmitter-side elements or users interface with receiver-side elements in order to facilitate, through interaction with such elements, the dynamic control of data processing or data flow at various points in the systems. This interaction is typically occasional or intermittent in nature.

Subclass 108: Alarm system using television network
Subclass 31: With encryption or scrambling of video signal
Subclass 6: Card reader (e.g., reader for credit, debit, or smart card)
Subclass 81: Using wireless link

Class 370: Multiplex Communications

This is the generic class for multiplexing or duplexing systems, methods, or apparatus.

Subclass 401: Bridge or gateway between networks

Class 455: Telecommunications

This is the generic class for modulated carrier wave communications not elsewhere classifiable.