METHODS AND APPARATUS FOR ENHANCED TRANSMIT POWER CONTROL
First Claim
1. A method for establishing a connection to a target apparatus with an initiating device, the method comprising:
- determining a parameter at a first time, where the determined parameter is related to a power associated with signal transmitted by the target apparatus;
transmitting an access attempt at a first power level, the first power level based at least in part on the determined parameter; and
when a response to the access attempt is not received;
updating the parameter at a second time; and
transmitting a second access attempt at a second power level, the second power level based at least in part on the updated parameter.
1 Assignment
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Accused Products
Abstract
Methods and apparatus for improved power control in communications (such as connection establishment) in a wireless network. In one embodiment, a data-based, iterative approach is used to select an appropriate transmission power level during the establishment of a wireless connection. An assessment of the quality of the channel between a connecting device and target device is made, based on a received reference signal from the target device. The assessment is used to select an initial power level for a random access request. In the case a response is not received, a subsequent assessment of the channel quality is made. If the quality of the channel has changed, then a second power level for a second random access request is selected. This approach allows the connecting device to adapt to changing conditions related to the channel quality, and adjust its transmission power level accordingly.
42 Citations
25 Claims
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1. A method for establishing a connection to a target apparatus with an initiating device, the method comprising:
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determining a parameter at a first time, where the determined parameter is related to a power associated with signal transmitted by the target apparatus; transmitting an access attempt at a first power level, the first power level based at least in part on the determined parameter; and when a response to the access attempt is not received; updating the parameter at a second time; and transmitting a second access attempt at a second power level, the second power level based at least in part on the updated parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. The method of 9, wherein the access attempt comprises a random access channel (RACH) request during an LTE handover operation.
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12. A mobile device configured to establish a connection to a target apparatus in a wireless network, the device comprising:
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a wireless transceiver, the transceiver configured to; receive a reference signal; transmit one or more request signals at one or more respective power levels; and receive a response to the transmitted one or more request signals; a processor; and a non-transitory computer-readable storage comprising a plurality of instructions, which when executed by the processor; monitor a value related to a signal strength of the reference signal at one or more times; and determine the respective power levels for the one or more request signals, at least one of the respective power levels based at least in part on the monitored value. - View Dependent Claims (13, 14, 15, 16)
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17. A method for establishing a connection to a target apparatus with an initiating device, the method comprising:
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determining a first parameter related to a received signal power associated with a transmission of the target apparatus; determining a second parameter related to a likelihood of success for the connection; and transmitting an access attempt at a first power level, the first power level based at least in part on the first and second parameters. - View Dependent Claims (18, 19, 20, 21)
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22. A mobile device configured to selectively adjust transmit power based at least on its radio environment, the device comprising:
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a processor; a radio transceiver in signal communication with the processor; and computerized logic in communication with the transceiver, the logic configured to; utilize the transceiver to sense at least one aspect of the radio environment; select a transmit power for a transmission to be sent to a target device, the selection being based at least in part on the sensed at least one aspect; cause the transmission to be transmitted from the transceiver; monitor for an indication of receipt of the transmission by the target device; and based on an absence of the indication, determine a transmit power for a second transmission, the determined transmit power for the second transmission being selected to maximize a likelihood that the second transmission will be received by the target device. - View Dependent Claims (23, 24, 25)
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Specification