Common power control channel in a CDMA system and a system and method for using such a channel
View Patent ↗A CDMA communication system supports designated mode data bursts and contention-based transmissions on a reverse link common channel from a subscriber unit to a base station. When transmissions are scheduled and serviced in the designated mode data burst, collisions are avoided. The number of slots consumed in the designated mode data bursts depend upon the volume of data the subscriber unit has to transmit to the base station. A common power control channel provides power control bits and reservation indications for at least one reverse link common channel for closed loop reverse link power control on the common channels.
1. A base station that supports communications with a plurality of subscriber units in a CDMA wireless communication system, the base station comprising:
an antenna;
a radio frequency interface coupled to the antenna;
a spreader/despreader coupled to the radio frequency interface;
a coder/decoder coupled to the spreader/despreader;
processing circuitry coupled to the coder/decoder;
memory coupled to the processing circuitry;
a base station controller interface coupled to the processing circuitry; and
the base station supporting a power control signal including:
a first power control/inhibit bit stream that corresponds to a first reverse link common channel;
a second power control/inhibit bit stream that corresponds to a second reverse link common channel, the second power control/inhibit bit stream offset in relation to the first power control/inhibit bit stream by a fixed offset;
a third power control/inhibit bit stream that corresponds to a third reverse link common channel, wherein the third power control/inhibit bit stream is offset from the first power control/inhibit bit stream by another fixed offset; and
a fourth power control/inhibit bit stream that corresponds to a fourth reverse link common channel, wherein the fourth control/inhibit bit stream is offset from the first power control/inhibit bit by yet another fixed offset.
2. A subscriber unit that supports communications with a base station in a CDMA wireless communication system, the subscriber unit comprising:
an antenna;
a radio frequency interface coupled to the antenna;
a spreader/despreader coupled to the radio frequency interface;
a coder/decoder coupled to the spreader/despreader;
processing circuitry coupled to the coder/decoder;
memory coupled to the processing circuitry;
a user interface coupled to the processing circuitry; and
the subscriber unit decoding and processing a power control signal to extract a first power control/inhibit bit stream that corresponds to a first reverse link common channel, the power control signal including:
a first power control/inhibit bit stream that corresponds to a first reverse link common channel;
a second power control/inhibit bit stream that corresponds to a second reverse link common channel, the second power control/inhibit bit stream offset in relation to the first power control/inhibit bit stream by a fixed offset;
a third power control/inhibit bit stream that corresponds to a third reverse link common channel, the third power control/inhibit bit stream is offset from the first power control/inhibit bit by another fixed offset; and
a fourth power control/inhibit bit stream that corresponds to a fourth reverse link common channel, the fourth control/inhibit bit stream is offset from the first power control/inhibit bit by yet another fixed offset.
3. A method for transmitting power control bits from a base station to a plurality of subscriber units in a code division multiple access wireless communication system, the common power control bits causing the subscriber units to manage their reverse link transmissions on a plurality of reverse link common channels, the method comprising:
determining a first power control/inhibit bit stream that corresponds to a first reverse link common channel;
determining a second power control/inhibit bit stream that corresponds to a second reverse link common channel;
determining a third power control/inhibit bit stream that corresponds to a third reverse link common channel;
determining a fourth power control/inhibit bit stream that corresponds to a fourth reverse link common channel;
combining the first power control/inhibit bit stream, the second power control/inhibit bit stream, the third power control/inhibit bit stream, and the fourth power control/inhibit bit stream into a common bit stream such that the second power control/inhibit bit stream is offset in relation to the first power control/inhibit bit stream by a fixed offset, that the third power control/inhibit bit stream is offset from the first power control/inhibit bit by another fixed offset; and the fourth power control/inhibit bit stream is offset from the first power control/inhibit bit by yet another fixed offset; and
transmitting the combined bit stream on a forward link channel.
4. A base station that supports communications with a plurality of subscriber units in a CDMA wireless communication system, the base station comprising:
an antenna;
a radio frequency interface coupled to the antenna;
a spreader/despreader coupled to the radio frequency interface;
a coder/decoder coupled to the spreader/despreader;
processing circuitry coupled to the coder/decoder;
memory coupled to the processing circuitry;
a base station controller interface coupled to the processing circuitry; and
the base station supporting a power control signal including:
a first power control/inhibit bit stream that corresponds to a first reverse link common channel;
a second power control/inhibit bit stream that corresponds to a second reverse link common channel, the second power control/inhibit bit stream offset in relation to the first power control/inhibit bit stream by a pseudo-random offset;
a third power control/inhibit bit stream that corresponds to a third reverse link common channel; and
a fourth power control/inhibit bit stream that corresponds to a fourth reverse link common channel, wherein the fourth control/inhibit bit stream is offset from the third power control/inhibit bit by a fixed offset.
5. A base station that supports communications with a plurality of subscriber units in a CDMA wireless communication system, the base station comprising:
an antenna;
a radio frequency interface coupled to the antenna;
a spreader/despreader coupled to the radio frequency interface;
a coder/decoder coupled to the spreader/despreader;
processing circuitry coupled to the coder/decoder;
memory coupled to the processing circuitry;
a base station controller interface coupled to the processing circuitry; and
the base station supporting a power control channel comprising:
a first power control/inhibit bit stream that corresponds to a first reverse link common channel;
a second power control/inhibit bit stream that corresponds to a second reverse link common channel, the second power control/inhibit bit stream offset by a pseudo-random offset in relation to the first power control/inhibit bit stream;
a third power control/inhibit bit stream that corresponds to a third reverse link common channel; and
a fourth power control/inhibit bit stream that corresponds to a fourth reverse link common channel, wherein the fourth control/inhibit bit stream is offset from the third power control/inhibit bit by another pseudo-random offset.
6. A base station that supports communications with a plurality of subscriber units in a CDMA wireless communication system, the base station comprising:
an antenna;
a radio frequency interface coupled to the antenna;
a spreader/despreader coupled to the radio frequency interface;
a coder/decoder coupled to the spreader/despreader;
processing circuitry coupled to the coder/decoder;
memory coupled to the processing circuitry;
a base station controller interface coupled to the processing circuitry; and
the base station supporting a power control channel comprising:
a first power control/inhibit bit stream that corresponds to a first reverse link common channel;
a second power control/inhibit bit stream that corresponds to a second reverse link common channel, the second power control/inhibit bit stream offset in relation to the first power control/inhibit bit stream;
a third power control/inhibit bit stream that corresponds to a third reverse link common channel; and
a fourth power control/inhibit bit stream that corresponds to a fourth reverse link common channel; and
wherein:
a starting bit position is pseudo-randomly selected from a plurality of available bit positions; and
the first, second, third and fourth power control/inhibit bit streams are pseudo-randomly positioned based upon the starting bit position.
7. A subscriber unit that supports communications with a base station in a CDMA wireless communication system, the subscriber unit comprising:
an antenna;
a radio frequency interface coupled to the antenna;
a spreader/despreader coupled to the radio frequency interface;
a coder/decoder coupled to the spreader/despreader;
processing circuitry coupled to the coder/decoder;
memory coupled to the processing circuitry;
a user interface coupled to the processing circuitry; and
the subscriber unit decoding and processing a power control signal to extract a first power control/inhibit bit stream that corresponds to a first reverse link common channel, the power control signal includes:
a first power control/inhibit bit stream that corresponds to a first reverse link common channel;
a second power control/inhibit bit stream that corresponds to a second reverse link common channel, the second power control/inhibit bit stream offset in relation to the first power control/inhibit bit stream by a pseudo-random offset;
a third power control/inhibit bit stream that corresponds to a third reverse link common channel; and
a fourth power control/inhibit bit stream that corresponds to a fourth reverse link common channel, the fourth control/inhibit bit stream is offset from the third power control/inhibit bit by a fixed offset.
8. A subscriber unit that supports communications with a base station in a CDMA wireless communication system, the subscriber unit comprising:
an antenna;
a radio frequency interface coupled to the antenna;
a spreader/despreader coupled to the radio frequency interface;
a coder/decoder coupled to the spreader/despreader;
processing circuitry coupled to the coder/decoder;
memory coupled to the processing circuitry;
a user interface coupled to the processing circuitry; and
the subscriber unit decoding and processing a power control signal to extract a first power control/inhibit bit stream that corresponds to a first reverse link common channel, the power control signal includes:
a first power control/inhibit bit stream that corresponds to a first reverse link common channel;
a second power control/inhibit bit stream that corresponds to a second reverse link common channel, the second power control/inhibit bit stream offset in relation to the first power control/inhibit bit stream by a pseudo-random offset;
a third power control/inhibit bit stream that corresponds to a third reverse link common channel; and
a fourth power control/inhibit bit stream that corresponds to a fourth reverse link common channel, the fourth control/inhibit bit stream is offset from the third power control/inhibit bit by another pseudo-random offset.
9. A subscriber unit that supports communications with a base station in a CDMA wireless communication system, the subscriber unit comprising:
an antenna;
a radio frequency interface coupled to the antenna;
a spreader/despreader coupled to the radio frequency interface;
a coder/decoder coupled to the spreader/despreader;
processing circuitry coupled to the coder/decoder;
memory coupled to the processing circuitry;
a user interface coupled to the processing circuitry; and
the subscriber unit decoding and processing a power control signal to extract a first power control/inhibit bit stream that corresponds to a first reverse link common channel, the power control signal includes:
a first power control/inhibit bit stream that corresponds to a first reverse link common channel;
a second power control/inhibit bit stream that corresponds to a second reverse link common channel, the second power control/inhibit bit stream offset in relation to the first power control/inhibit bit stream;
a third power control/inhibit bit stream that corresponds to a third reverse link common channel; and
a fourth power control/inhibit bit stream that corresponds to a fourth reverse link common channel; and
wherein:
a starting bit position is pseudo-randomly selected from a plurality of available bit positions; and
the first, second, third and fourth power control/inhibit bit streams are pseudo-randomly positioned based upon the starting bit position.
10. A method for transmitting power control bits from a base station to a plurality of subscriber units in a code division multiple access wireless communication system, the common power control bits causing the subscriber units to manage their reverse link transmissions on a plurality of reverse link common channels, the method comprising:
determining a first power control/inhibit bit stream that corresponds to a first reverse link common channel;
determining a second power control/inhibit bit stream that corresponds to a second reverse link common channel;
determining a third power control/inhibit bit stream that corresponds to a third reverse link common channel;
determining a fourth power control/inhibit bit stream that corresponds to a fourth reverse link common channel;
combining the first power control/inhibit bit stream, the second power control/inhibit bit stream, the third power control/inhibit bit stream, and the fourth power control/inhibit bit stream into a common bit stream such that the second power control/inhibit bit stream is offset in relation to the first power control/inhibit bit stream by a pseudo-random offset, and that the fourth power control/inhibit bit stream is offset from the third power control/inhibit bit by a fixed offset; and
transmitting the combined bit stream on a forward link channel.
11. A method for transmitting power control bits from a base station to a plurality of subscriber units in a code division multiple access wireless communication system, the common power control bits causing the subscriber units to manage their reverse link transmissions on a plurality of reverse link common channels, the method comprising:
determining a first power control/inhibit bit stream that corresponds to a first reverse link common channel;
determining a second power control/inhibit bit stream that corresponds to a second reverse link common channel;
determining a third power control/inhibit bit stream that corresponds to a third reverse link common channel;
determining a fourth power control/inhibit bit stream that corresponds to a fourth reverse link common channel;
combining the first power control/inhibit bit stream, the second power control/inhibit bit stream, the third power control/inhibit bit stream, and the fourth power control/inhibit bit stream into a common bit stream such that the second power control/inhibit bit stream is offset in relation to the first power control/inhibit bit stream by a pseudo-random offset, and that the fourth power control/inhibit bit stream is offset from the third power control/inhibit bit by another pseudo-random offset; and
transmitting the combined bit stream on a forward link channel.
12. A method for transmitting power control bits from a base station to a plurality of subscriber units in a code division multiple access wireless communication system, the common power control bits causing the subscriber units to manage their reverse link transmissions on a plurality of reverse link common channels, the method comprising:
determining a first power control/inhibit bit stream that corresponds to a first reverse link common channel;
determining a second power control/inhibit bit stream that corresponds to a second reverse link common channel;
determining a third power control/inhibit bit stream that corresponds to a third reverse link common channel;
determining a fourth power control/inhibit bit stream that corresponds to a fourth reverse link common channel;
combining the first power control/inhibit bit stream, the second power control/inhibit bit stream, the third power control/inhibit bit stream, and the fourth power control/inhibit bit stream into a common bit stream, wherein:
a starting bit position is pseudo-randomly selected from a plurality of available bit positions; and
the first, second, third and fourth power control/inhibit bit streams are pseudo-randomly positioned based upon the starting bit position; and
transmitting the combined bit stream on a forward link channel.