Hybrid phase sweeping for mobile transmit diversity
AssigneeQUALCOMM Incorporated
InventorAndrew Sendonaris
Life of this patent
Estimating the term…
Abstract
An improved method and apparatus for Mobile Transmit Diversity (MTD), or Uplink Transmit Diversity (ULTD) is disclosed. The mobile device either selects the best antenna at any given time, or transmits from both antennas using the best beam forming phase without feedback from the base station on which antenna to transmit from or which phase to use if using two antennas. Essentially operating in Open Loop MTD, a Hybrid Phase Sweeping algorithm requires testing of a fraction of phase hypotheses resulting in improved base station performance and higher data rates for the user.
Claims25
A method for Open Loop Mobile Transmit Diversity in a wireless communication system comprising:
- determining a set of transmission test phase hypotheses;
- selecting one of the set of transmission test phase hypotheses using a turn direction;
- calculating a test uplink transmission quality metric value for the selected test phase hypothesis during a test period of a test cycle using a turn direction;
- comparing the test uplink transmission quality metric value to a steady state uplink transmission quality metric value;
- and
- changing the test phase hypothesis for a next test cycle if the test uplink transmission quality metric value is worse than the steady state uplink transmission quality metric value, or using the test phase hypothesis as a current phase if the test uplink transmission quality metric value is better than the steady state uplink transmission quality metric value.
A mobile device for Open Loop Mobile Transmit Diversity in a wireless communication system comprising:
- a wireless communications transceiver and associated antennas capable of sending and receiving wireless communications signals;
- a modem coupled to the transceiver comprising processor(s) for processing signals and executing code stored in a memory;
- a power management unit coupled to the modem and the transceiver for measuring and controlling transmit power;
- and
- a memory coupled to the modem for storing instructions for determining a set of transmission test phase hypotheses, selecting one of the set of transmission test phase hypotheses using a turn direction, calculating a test uplink transmission quality metric value for the selected test phase hypothesis during a test period of a test cycle using a turn direction, comparing the test uplink transmission quality metric value to a steady state uplink transmission quality metric value, and changing the test phase hypothesis for a next test cycle if the test uplink transmission quality metric value is worse than the steady state uplink transmission quality metric value, or using the test phase hypothesis as a current phase if the test uplink transmission quality metric value is better than the steady state uplink transmission quality metric value.
A device for Open Loop Mobile Transmit Diversity in a wireless communication system comprising:
- means for determining a set of transmission test phase hypotheses;
- means for selecting one of the set of transmission test phase hypotheses using a turn direction;
- means for calculating a test uplink transmission quality metric value for the selected test phase hypothesis during a test period of a test cycle;
- means for comparing the test uplink transmission quality metric value to a steady state unlink transmission quality metric value;
- means for changing the test phase hypothesis for a next test cycle if the test uplink transmission quality metric value is worse than the steady state uplink transmission quality metric value, or using the test phase hypothesis as a current phase if the test uplink transmission quality metric value is better than the steady state uplink transmission quality metric value.
A non-transitory computer readable medium having instructions stored thereon to cause a processor in a mobile device to:
- determine a set of transmission test phase hypotheses;
- select one of the set of transmission test phase hypotheses using a turn direction;
- calculate a test uplink transmission quality metric value for the selected test phase hypothesis during a test period of a test cycle using a turn direction;
- compare the test uplink transmission quality metric value to a steady state uplink transmission quality metric value;
- and
- change the test phase hypothesis for a next test cycle if the test uplink transmission quality metric value is worse than the steady state uplink transmission quality metric value, or using the test phase hypothesis as a current phase if the test uplink transmission quality metric value is better than the steady state uplink transmission quality metric value.
Dependencies are inferred from the claim text.