Forward-link scheduling in a wireless communication system during soft and softer handoff
First Claim
1. A method of scheduling transmit rates and transmit power levels of data users in a wireless communication system during softer handoff, comprising:
- transmitting signals between a base station having at least two sectors and a remote station via at least one first channel per sector, wherein the transmitted signals comprise voice-data;
measuring at the base station a ratio of transmission power levels for the voice-data transmitted via the at least one first channel per sector;
determining a historical profile for the ratio of transmission power levels; and
using the historical profile for the ratio of transmission power levels to select a second channel transmission power level and data rate for transmitting additional data.
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Accused Products
Abstract
A method and apparatus for scheduling transmit rates and power levels for data in conjunction with a voice-data communication during conditions of soft and softer handoff. During conditions of no handoff, or hard handoff, an algorithm selects a slot reflecting a favored power level and transmission rate for transmitting the non-voice data on a supplemental channel. The slot is selected based upon the transmission power levels for voice-data transmitted by a base station to a remote station on a fundamental channel. The algorithm applies to softer handoff using information from all the sectors of a base station involved in the softer handoff. During soft handoff, instead of scheduling forward link transmission based on recent power and rate, or C/I information, data is continuously transmitted to the user at a power level based on average required power.
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Citations
10 Claims
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1. A method of scheduling transmit rates and transmit power levels of data users in a wireless communication system during softer handoff, comprising:
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transmitting signals between a base station having at least two sectors and a remote station via at least one first channel per sector, wherein the transmitted signals comprise voice-data;
measuring at the base station a ratio of transmission power levels for the voice-data transmitted via the at least one first channel per sector;
determining a historical profile for the ratio of transmission power levels; and
using the historical profile for the ratio of transmission power levels to select a second channel transmission power level and data rate for transmitting additional data. - View Dependent Claims (2)
measuring at the remote station transmission metrics reflecting the quality of voice-data signals received from the base station sectors;
messaging from the remote station to the base station any change or non-change in the voice-data quality; and
adjusting or not adjusting the transmission power in consideration of said messages for voice-data transmitted by the base station sectors.
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3. A signal bearing medium tangibly embodying a program of machine-readable instructions executable by a processor to perform a method for predicting a favored slot for transmitting data in a wireless communication system during softer handoff, the instructions comprising:
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transmitting signals containing voice-data between a base station having at least two sectors and a remote station;
measuring at the base station a ratio of transmission power levels for voice-data transmitted via the at least one first channel per sector;
determining a historical profile for the ratio of transmission power levels; and
using the historical profile of the ratio of transmission power levels to select a second channel transmission power level and data rate for transmitting additional data. - View Dependent Claims (4, 5)
measuring at the remote station transmission metrics reflecting the quality of voice-data signals received from the sectors of the base station;
messaging from the remote station to the base station any change or non-change in the voice-data quality; and
adjusting or not adjusting the transmission power of the sectors in consideration of said messages for voice-data transmitted by the base station.
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5. The signal-bearing medium in accordance with claim 3, wherein the instructions further comprise:
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measuring at the remote station transmission metrics reflecting the quality of voice-data signals received from the base station;
messaging from the remote station to the base station any change or non-change in the voice-data quality; and
adjusting or not adjusting the transmission power in consideration of said messages for voice-data transmitted by the base station.
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6. A base station for scheduling transmit rates and transmit power levels of data users in a wireless communication system during softer handoff, the base station having at least two sectors communicatively coupled to a remote station, wherein the base station may communicate with the remote station using more than one channel, the base station comprising:
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a transmitter, the transmitter capable of transmitting voice and non-voice data signals between a base station and a remote station; and
a processor communicatively coupled to the transmitter and capable of executing instructions to;
measure at the base station transmission power levels for voice-data transmitted to the remote station via at least one first channel per sector;
determine a dynamic transmission power level for transmissions made via the at least one first channel per sector; and
use the dynamic transmission power level to select a second channel transmission slot for transmitting additional data to the remote station.
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7. A method of scheduling transmit rates and transmit power levels of data users in a wireless communication system, comprising:
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transmitting signals between a base station and a remote station via at least one first channel, wherein the transmitted signals comprise voice-data;
measuring at the base station transmission power levels for the voice-data transmitted via the at least one first channel;
determining a historical profile for the transmission power levels;
using the historical profile for the transmission power levels to select a second channel transmission power level and data rate for transmitting additional data;
selecting a soft handoff power level and transmission rate based on average required power; and
transmitting continuously to the user at the soft handoff power level and transmission rate during soft handoff. - View Dependent Claims (8)
measuring at the remote station transmission metrics reflecting the quality of voice-data signals received from the base station;
messaging from the remote station to the base station any change or non-change in the voice-data quality; and
adjusting or not adjusting the transmission power in consideration of said messages for voice-data transmitted by the base station.
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9. A signal bearing medium tangibly embodying a program of machine-readable instructions executable by a processor to perform a method for scheduling transmit rates and transmit power levels of data users in a wireless communication system, the instructions comprising:
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transmitting signals containing voice-data between a base station and a remote station;
measuring at the base station transmission power levels for voice-data transmitted via at least one first channel;
determining a historical profile for the transmission power levels;
using the historical profile of the transmission power levels to select a second channel transmission power level and data rate for transmitting additional data;
selecting a soft handoff power level and transmission rate based on average required power; and
transmitting continuously to the user at the soft handoff power level and transmission rate during soft handoff.
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10. A base station for scheduling transmit rates and transmit power levels of data users in a wireless communication system, the base station communicatively coupled to a remote station, wherein the base station may communicate with the remote station using more than one channel, the base station comprising:
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a transmitter, the transmitter capable of transmitting voice and non-voice data signals between a base station and a remote station; and
a processor communicatively coupled to the transmitter and capable of executing instructions to;
measure at the base station transmission power levels for voice-data transmitted to the remote station via at least one first channel;
determine a dynamic transmission power level for transmissions made via the at least one first channel;
use the dynamic transmission power level to select a second channel transmission slot for transmitting additional data to the remote station;
select a soft handoff power level and transmission rate based on average required power; and
transmit continuously to the user at the soft handoff power level and transmission rate during soft handoff.
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Specification