Code division multiple access system providing variable data rate access to a user

Claim 2

The radio transmitter unit of claim 1 CHARACTERIZED IN THAT the user can dynamically change the selected bit rate during a transmission.

Claim 3

A code division multiple access radio transmitter unit CHARACTERIZED BY means for receiving a digital bit stream from a user at one of a plurality of source bit rates, wherein said plurality of source bit rates includes a basic bit rate R and at least one other bit rate which is a multiple M of the basic bit rate R, where R and M are positive integers of at least 1, a user input selecting a particular user source bit rate by identifying a basic bit rate multiple M, adjustable coding means, responsive to said user input, 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, the radio transmitter unit further comprising first means for requesting a communication connection over a common access channel of a communication facility, means for receiving a primary code C ₁ , over a broadcast channel of said facility, said primary code enabling said transmitter unit to transmit at the basic bit rate R, second means for requesting over said facility, in response to the user input, a change in transmission rate from the basic bit rate R to a rate which is a multiple M of the basic bit rate R, and wherein said adjustable coding means changes its transmission bit rate in response to a control signal received over said facility identifying a multiple M' ( M ' ≦ M ) times the basic bit rate R at which said radio transmitter unit can transmit.

Claim 4

The radio transmitter unit of claim 3 further CHARACTERIZED BY means for generating codes C ₂ through C M ' , using said primary code C ₁, and wherein said adjustable coding means is responsive to the codes C ₂ through C M ' , to enable transmitting the user digital bit stream at a multiple M ' times the basic bit rate R.

Claim 5

The radio transmitter unit of claim 4 CHARACTERIZED IN THAT one of said codes C ₁ through C M ' has sub-rate capability.

Claim 6

The radio transmitter unit of claim 4 arranged to transmit at a carrier frequency to a base station, and CHARACTERIZED IN THAT said codes C ₁ through C M ' used by said radio transmitter unit are different from the codes used by a second radio transmitter unit which transmits to the base station at said carrier frequency.

Claim 7

The radio transmitter unit of claim 1 which communicates with a base station over a facility and FURTHER CHARACTERIZED BY means for receiving an uplink control signal over the facility, means, responsive to the uplink control signal from the base station, for making a probabilistic determination of the success of the radio transmitter unit transmitting at one or more multiples M of the basic bit rate R, and wherein said adjustable coding means is responsive to a determined multiple M for transmitting the user's digital bit stream at M times the basic rate R over the facility.

Claim 8

The radio transmitter unit of claim 1 which communicates with a base station over a facility and which is FURTHER CHARACTERIZED BY means for receiving a signal from the base station indicating a probability of success for transmissions at different multiples M and wherein said adjustable coding means determines which multiple M of the basic bit rate R at which to transmit the user's digital bit stream over the facility.

Claim 9

The radio transmitter unit of claim 1 CHARACTERIZED IN THAT the user's digital bit stream is received as burst data and wherein said adjustable coding means transmits the burst data at a first bit rate and maintains a sub-rate signaling during a silent interval between bursts of data.