Method and apparatus for power control in a wireless communication system
AssigneeQUALCOMM Incorporated
InventorsAvneesh Agrawal, Da-shan Shiu
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Abstract
In a wireless communication system having a composite transport channel made up of individual transport channels, a method for closed loop power control wherein multiple instances of the outer loop are performed in parallel. The method determines a Signal-to-Interference Ratio (SIR) threshold for the composite channel based on a channel quality metric evaluated for each of the individual channels. In one embodiment the channel quality metric is a Cyclical Redundancy Check (CRC) outcome.
Claims24
In a wireless communication system wherein multiple data streams are transmitted via a composite channel, the composite channel comprising a plurality of transport channels, a method comprising:
- assigning a power indicator to each of the plurality of transport channels;
- performing an outer loop computation having a first period, the outer loop, comprising:
- decrementing the power indicator of each of the plurality of transport channels having a transmission error;
- incrementing the power indicator of each of the plurality of transport channels without a transmission error;
- and
- determining a maximum power indicator from the power indicators of each of the plurality of transport channels;
- performing an inner loop computation having a second period, the inner loop computation, comprising:
- making a power control decision based on the maximum power indicator,
- wherein the first period is larger than the second period.
A method for power control in a wireless communication system, wherein transmissions in the system use a composite transport channel comprising a plurality of transport channels, comprising:
- receiving data streams via the plurality of transport channels;
- performing an outer loop computation having a first period, the outer loop computation comprising:
- determining an individual quality threshold for each of the plurality of transport channels;
- and
- determining a composite quality threshold for the composite transport channel,
- wherein the composite quality threshold is equal to a maximum of the individual quality thresholds;
- and
- performing an inner loop having a second period, the inner loop computation comprising:
- making a power control decision based on the composite quality threshold;
- wherein the first period is larger than the second period.
A wireless apparatus, comprising:
- a processor operative to process multiple data streams, wherein the multiple data streams are received via a plurality of transport channels;
- an error detection unit coupled to the processor, the error detection unit operative to detect errors in the multiple data streams;
- and
- a power control unit adapted to perform an outer loop having a first period, the outer loop comprising calculating quality thresholds for each of a plurality of transport channels, wherein a first quality threshold associated with a first transport channel is increased on detection of an error in a first data stream transmitted via the first transport channel, wherein the power control unit is adapted to perform an inner loop having a second period to determine a power control instruction according to the quality thresholds, wherein the first period is larger than the second period.
In a wireless communication system wherein multiple data streams are transmitted via a composite channel, the composite channel comprising a plurality of transport channels, a method comprising:
- assigning a power indicator to each of the plurality of transport channels;
- decrementing the power indicator of each of the plurality of transport channels having a transmission error;
- incrementing the power indicator of each of the plurality of transport channels without a transmission error;
- determining a maximum power indicator from the power indicators of each of the plurality of transport channels;
- making a power control decision based on the maximum power indicator;
- wherein the decrementing applies a decrement step value;
- the incrementing applies an increment step value different from the decrement step value;
- and
- wherein the decrement step value is a function of the increment step value.
A method for power control in a wireless communication system, wherein transmissions in the system use a composite transport channel comprising a plurality of transport channels, comprising:
- receiving data streams via the plurality of transport channels,
- determining an individual quality threshold for each of the plurality of transport channels;
- determining a composite quality threshold for the composite transport channel, wherein the composite quality threshold is equal to a maximum of the individual quality thresholds,
- updating the individual quality thresholds as a function of transmission errors on each of the plurality of transport channels,
- wherein the individual quality thresholds are maintained within a predetermined range of the composite quality threshold.
A wireless apparatus, comprising:
- a processor operative to process multiple data streams, wherein the multiple data streams are received via a plurality of transport channels;
- an error detection unit coupled to the processor, the error detection unit operative to detect errors in the multiple data streams;
- and
- a power control unit adapted to calculate quality thresholds for each of a plurality of transport channels, wherein a first quality threshold associated with a first transport channel is increased on detection of an error in a first data stream transmitted via the first transport channel, wherein the power control unit is adapted to determine a power control instruction according to the quality thresholds,
- wherein the power control unit is adapted to decrease the first quality threshold if no error is detected, and
- wherein quality threshold decrease steps are a function of block error probability.
Dependencies are inferred from the claim text.