Television – Two-way video and voice communication – User positioning
Patent
1996-05-21
1998-09-08
Chin, Tommy P.
Television
Two-way video and voice communication
User positioning
348 7, 348 13, 370458, H04N 7173
Patent
active
058052038
ABSTRACT:
A time division, multiplexed, shared bandwidth, high speed data system for use over CATV and broadcast equipment, which allows transmission rates to be adjusted on a per receiver basis in both forward (downstream) and return (upstream) directions, utilizes a time division multiplexed method to transmit information from a service provider to a plurality of users (downstream) using the equivalent of horizontal sync pulses to define the start and end of a period of transmission assigned to a specific user. The transmission is grouped into frames which typically contain five hundred to several thousand transmission periods. In each frame, at least one transmission period is reserved for each actively connected user which is used as a connection control channel. The remaining transmission periods are shared by all users and are dynamically allocated to transfer data. Hence, each user is allocated a small fixed bandwidth control channel and is provided with additional shared bandwidth for data transfers as needed. Transmission from the user to the service provider (upstream) is also time division multiplexed. Each user is allocated a period of time relative to the occurrence of the start of a frame, adjusted for the round trip propagation delay between the service provider and user, which is used as an upstream control channel which can be used to request additional shared upstream bandwidth for data transfers as needed.
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Chin Tommy P.
Din Luanne P.
JSM Co., Inc.
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