Code division multiple access system providing variable data rate access to a user
First Claim
1. A code division multiple access radio transmitter unit comprisingmeans for receiving a digital bit stream from a user at one of a plurality of source bit rates andadjustable coding means, responsive to a user input selecting one of said plurality of source bit rates during an existing connection, for dynamically assigning one or more spreading codes for spreading and transmitting the user digital bit stream received at the selected bit rate to a channel bit rate which at least equals the highest bit rate of said plurality of source bit rates.
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Abstract
A multi-code code division multiple access system allows a user at a radio transmitter unit to dynamically change its source data bit rate. In response to a user input selecting one of said plurality of source bit rates, an adjustable coding means in the transmitter spreads and transmits the user'"'"'s digital bit stream received at the selected bit rate to a channel bit rate which at least equals the highest bit rate of said plurality of source bit rates. The plurality of source bit rates includes a basic bit rate R and at least one bit rate which is a multiple M of the basic bit rate R, where M is an integer of at least 1. The user'"'"'s input selects a particular user source bit rate by identifying a basic bit rate multiple M to a base station that is to receive the transmission.
178 Citations
16 Claims
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1. A code division multiple access radio transmitter unit comprising
means for receiving a digital bit stream from a user at one of a plurality of source bit rates and adjustable coding means, responsive to a user input selecting one of said plurality of source bit rates during an existing connection, for dynamically assigning one or more spreading codes for spreading and transmitting the user digital bit stream received at the selected bit rate to a channel bit rate which at least equals the highest bit rate of said plurality of source bit rates.
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5. A code division multiple access radio transmitter unit comprising
means for receiving a digital bit stream from a user at one of a plurality of source bit rates, and adjustable coding means, responsive to a user input selecting one of said plurality of source bit rates, for dynamically assigning plural spreading codes for spreading and transmitting the user digital bit stream received at the selected bit rate to a channel bit rate which at least equals the highest bit rate of said plurality of source bit rates.
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7. A code division multiple access radio transmitter unit comprising
means for receiving a digital bit stream from a user at one of a plurality of source bit rates, adjustable coding means, responsive to a user input selecting one of said plurality of source bit rates, for assigning one or more spreading codes for spreading and transmitting the user digital bit stream received at the selected bit rate to a channel bit rate which at least equals the highest bit rate of said plurality of source bit rates; - and wherein
said plurality of source bit rates includes a bit rate which is a multiple M of the basic bit rate R, where M is a number having an integer portion I greater than or equal to one and a fractional portion m, where 0<
m<
1, said user input selecting a particular user source bit rate by identifying a basic bit rate multiple M.
- and wherein
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8. A code division multiple access radio transmitter unit comprising
means for receiving a digital bit stream from a user at one of a plurality of source bit rates, adjustable coding means, responsive to a user input selecting one of said plurality of source bit rates, for assigning one or more spreading codes for spreading and transmitting the user digital bit stream received at the selected bit rate to a channel bit rate which at least equals the highest bit rate of said plurality of source bit rates; - and wherein
said adjustable coding means includes a serial-to-parallel means, responsive to a user'"'"'s input identifying a basic bit rate multiple M, where M is a number having an integer portion I greater than or equal to one and a fractional portion m, where 0<
m<
1, for converting a received user bit stream, which is M times a basic bit rate R, into I+1 basic bit rate streams, wherein at least one of the I+1 basic bit rate streams can transmit at the fractional rate m,M encoder means for spreading each of the I+1 basic bit rate streams, using a different spreading code C, into I+1 channel bit rate signals, and means for combining the I+1 channel bit rate signals into one channel bit rate signal and modulating the channel signal onto a carrier signal for transmission from the code division multiple access radio transmitter unit.
- and wherein
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9. A method of providing code division multiple access for a radio transmitter unit, comprising the steps of
receiving a digital bit stream from a user at one of a plurality of source bit rates and responsive to a user input selecting one of said plurality of source bit rates during an existing connection, dynamically assigning one or more spreading codes for spreading and transmitting the user digital bit stream received at the selected bit rate to a channel bit rate which at least equals the highest bit rate of said plurality of source bit rates.
Specification