Method and apparatus for estimating transmit power of a wireless device
First Claim
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1. A method comprising:
- transmitting a first power control command to a device indicating a power level at which the device is to transmit;
initiating a first request for the device to report its transmit power;
receiving a first reported transmit power from the device in response to the first request;
transmitting a second power control command to the device indicating one or more power steps by which the device is to change its transmit power level;
initiating a second request for the device to report its transmit power;
receiving a second reported transmit power from the device in response to the second request;
creating a data structure that maps the indicated power level of the first power control command to the first reported transmit power, and maps the one or more power steps of the second power control command to the second reported transmit power, the data structure including a set of path loss trigger conditions;
measuring a strength of signals received from the device;
determining a path loss from the device based on the measured strength of the signals and an estimated current transmit power level of the device as referenced from the data structure;
determining, by a radio controller, whether the path loss coincides with one or more of the path loss trigger conditions; and
waking a host processor, by the radio controller, if the determined path loss coincides with the one or more path loss trigger conditions.
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Abstract
The present disclosure sets forth a method for tracking path loss in which a monitoring device issues a series of power step commands and transmit power requests to a reporting device, receives transmit power data in response to the transmit power requests, and creates a data structure (e.g., a table) that maps the number of steps (e.g., number of steps increased or decreased) of the power step commands with the reported transmit powers. This process is performed during the initial connection between the monitoring device and the reporting device.
400 Citations
20 Claims
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1. A method comprising:
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transmitting a first power control command to a device indicating a power level at which the device is to transmit; initiating a first request for the device to report its transmit power; receiving a first reported transmit power from the device in response to the first request; transmitting a second power control command to the device indicating one or more power steps by which the device is to change its transmit power level; initiating a second request for the device to report its transmit power; receiving a second reported transmit power from the device in response to the second request; creating a data structure that maps the indicated power level of the first power control command to the first reported transmit power, and maps the one or more power steps of the second power control command to the second reported transmit power, the data structure including a set of path loss trigger conditions; measuring a strength of signals received from the device; determining a path loss from the device based on the measured strength of the signals and an estimated current transmit power level of the device as referenced from the data structure; determining, by a radio controller, whether the path loss coincides with one or more of the path loss trigger conditions; and waking a host processor, by the radio controller, if the determined path loss coincides with the one or more path loss trigger conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device, comprising:
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a radio controller configured to; transmit a power control command to a monitored device, the power control command indicating power steps for the monitored device to transmit at different power levels; receive reported transmit power at each of the different power levels from the monitored device; a host processor configured to; generate a data structure that maps the power steps of the power control command to the reported transmit power for each of the different power levels, the data structure including path loss trigger conditions; provide the data structure to the radio controller; the radio controller further configured to; measure a strength of signals received from the monitored device; determine a path loss between the device and the monitored device based on the measured strength of the signals and an estimated transmit power level of the monitored device; and wake the host processor if the determined path loss coincides with one or more of the path loss trigger conditions. - View Dependent Claims (15, 16, 17, 18)
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19. A system, comprising:
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a wireless device configured to transmit at different power levels; a monitoring device to monitor a transmit power of the wireless device, the monitoring device configured to; transmit a power control command to the wireless device, the power control command initiating the wireless device to transmit at the different power levels; receive reported transmit power at each of the different power levels from the wireless device; generate a data structure that maps the reported transmit power for each of the different power levels, the data structure including path loss trigger conditions; measure a strength of signals received from the wireless device; determine a path loss between the monitoring device and the wireless device based on the measured strength of the signals and an estimated transmit power level of the wireless device; and wake a host processor of the monitoring device if the determined path loss coincides with one or more of the path loss trigger conditions. - View Dependent Claims (20)
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Specification