What is claimed is:
1. Back EMF sensing tachometer circuitry for measuring the back EMF of a coil of an actuator and for generating a signal for control of the velocity of the actuator, comprising:
means for receiving a back EMF signal from the coil;
an integrator feedback element having a gain adjust element for reducing error caused by resistance of the coil; and
means for outputting a velocity signal for controlling the velocity of the actuator.
2. Back EMF sensing tachometer circuitry according to claim 1, wherein said gain adjust element reduces error caused by resistance in the actuator coil by subtracting a scaled voltage measured across a series current sense resistor.
3. Back EMF sensing tachometer circuitry according to claim 1, further comprising an inductance compensation element having a first RC circuit portion for reducing error caused by inductance of the coil;
4. Back EMF sensing tachometer circuitry according to claim 3, wherein the error created by coil inductance is reduced by pre-selecting appropriate values for at least one resistor and at least one capacitor of the first RC circuit portion of the inductance compensation element.
5. Back EMF sensing tachometer circuitry according to claim 1, further comprising a higher order compensation element having a second RC circuit portion for reducing higher order effects that influence the operation of the circuit;
6. Back EMF sensing tachometer circuitry according to claim 5, wherein the error created by the higher order effects is reduced by pre-selecting appropriate values for at least one resistor and at least one capacitor of the second RC circuit portion of the higher order compensation circuit.
7. Back EMF sensing tachometer circuitry according to claim 1, further comprising means for receiving an external digital to analog converter (DAC) offset input.
8. Back EMF sensing tachometer circuitry according to claim 7, wherein said means for receiving an external digital to analog converter (DAC) offset input reduces error due to amplifier offsets.
9. Back EMF sensing tachometer circuitry according to claim 1, wherein after calibration of the back EMF sensing tachometer circuitry, the back EMF sensing circuitry generates a velocity control signal that operates for a bandwidth of approximately 1 kHz for controlling the velocity of an actuator arm.
10. A method for calibrating a back EMF sensing tachometer circuit used for controlling a velocity of an actuator via a velocity output voltage signal, comprising:
setting an offset DAC input of the circuit equal to a reference voltage;
applying a DC bias to the actuator;
disconnecting via a switch the velocity output voltage signal for controlling the velocity of the actuator and thereby connecting the velocity output voltage signal instead to an input of an integrator feedback portion;
waiting for at least one of an input and an output of the integrator feedback portion to stabilize;
re-connecting via the switch the standard velocity output voltage signal and thereby disconnecting the velocity output voltage signal from the input of the integrator feedback portion; and
in accordance with an output of the integrator feedback portion, setting an initial approximate gain adjust value for use in DC offset adjustment.
11. A method according to claim 10, wherein after the setting of the initial approximate gain adjust value, the method further includes:
applying the reference voltage to an actuator amplifier;
adjusting the offset DAC input until the velocity output voltage signal is equal to the reference voltage; and
to provide finer adjustments to the resistance compensation gain adjust value, the method further includes again performing the steps of
said applying of the DC bias to the actuator;
said disconnecting via the switch of the velocity output voltage signal for controlling the velocity of the actuator and said concomitant connecting of the velocity output voltage signal instead to an input of the integrator feedback portion;
said waiting for at least one of an input and an output of the integrator feedback portion to stabilize; and
said re-connecting via the switch of the standard velocity output voltage signal and said concomitant disconnecting of the velocity output voltage signal from the input of the integrator feedback portion.
12. A method according to claim 11, wherein said applying of the reference voltage to an actuator amplifier causes very little current to flow in the actuator coil.
13. A method according to claim 10, wherein said disconnecting of the velocity output voltage signal from the input of the integrator feedback portion holds the integrator output and the resulting gain adjust value constant.
14. A method according to claim 10, wherein said connecting of the velocity output voltage signal instead to an input of an integrator feedback portion includes connecting the velocity output voltage signal to the input of the integrator feedback portion across a resistor.
15. A method according to claim 10, wherein the method is performed at power up of a storage device having the back EMF sensing tachometer circuit prior to loading heads onto a storage medium.
16. A method according to claim 10, further comprising detecting back EMF from an actuator coil.
17. A method according to claim 10, wherein said waiting for at least one of an input and an output of the integrator feedback portion to stabilize includes receiving closed loop feedback from an integrator of the integrator feedback portion to adjust the gain of the resistance compensation branch until the resulting velocity output voltage signal is equal to the reference voltage.
18. A method according to claim 10, wherein once the back EMF sensing circuit is calibrated, the velocity output voltage signal may be used for at least one of: providing velocity control of the head arm actuator while loading heads onto media, providing velocity control of the head arm actuator while parking heads onto a load ramp, providing analog velocity signal for improved position control during seeks, providing an analog velocity signal for improved position control during a track follow operation, providing feed forward for canceling the effects of external shocks applied to a storage device having the back EMF sensing tachometer circuit and providing an indicator of external shock applied to the a storage device having the back EMF sensing tachometer circuit.
19. A method according to claim 10, wherein an inductance compensation element having a first RC circuit portion reduces error caused by inductance of the coil.
20. A method according to claim 10, wherein a higher order compensation element having a second RC circuit portion reduces higher order effects that influence the operation of the circuit.
21. A method according to claim 10, wherein after calibration of the back EMF sensing tachometer circuitry, the back EMF sensing circuitry generates a velocity control signal that operates for a bandwidth of approximately 1 kHz for at least controlling the velocity of an actuator arm.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A device configured to:
receive configuration information for carrying out a measurement,
carry out the measurement of a network-performance related metric consistent with the configuration information when the device is connected to a cell or a public land mobile network (PLMN) authorized for the measurement to be performed, and
transmit an indication of an availability of the measurement to a network element when the device is connected to a cell or PLMN included in a list comprising at least one reporting place authorized for reporting the measurement.
2. The device according to claim 1, wherein the device is at least one of a cellular telephone, a personal digital assistant device, or an internet-enabled wireless device.
3. The device according to claim 1, wherein the measurement is a logged-type measurement carried out when the device is in an idle mode of operation.
4. The device according to claim 1, wherein the configuration information comprises at least one of a measurement validity time or a report validity time.
5. The device according to claim 4, wherein the device is further configured to stop carrying out the measurement of the network-performance related metric when the measurement validity time is over.
6. The device according to claim 4, wherein the device is further configured to store the measurement of the network-performance related metric during the report validity time.
7. The device according to claim 6, wherein the device is further configured to delete the measurement of the network-performance related metric when the report validity time is over.
8. The device according to claim 1, wherein the device is further configured to receive new configuration information for carrying out the measurement; and, upon receipt of the new configuration information, replace the configuration information previously received with the new configuration information and clear the measurement of the network-performance related metric carried out consistent with the configuration information previously received.
9. The device according to claim 1, wherein the indication is transmitted to the network element in an RRCConnectionSetupComplete message.
10. A method comprising:
receiving configuration information for carrying out a measurement,
carrying out the measurement of a network-performance related metric consistent with the configuration information when the device is connected to a cell or a public land mobile network (PLMN) authorized for the measurement to be performed, and
transmitting an indication of an availability of the measurement to a network element when the device is connected to a cell or PLMN included in a list comprising at least one reporting place authorized for reporting the measurement.
11. The method according to claim 10, wherein the measurement is a logged-type measurement carried out in an idle mode of operation.
12. The method according to claim 10, wherein the configuration information comprises at least one of a measurement validity time or a report validity time.
13. The method according to claim 12, wherein the measurement of the network-performance related metric is stopped being carried out when the measurement validity time is over.
14. The method according to claim 12, further comprising storing the measurement of the network-performance related metric during the report validity time.
15. The method according to claim 14, further comprising deleting the measurement of the network-performance related metric when the report validity time is over.
16. The method according to claim 10, further comprising:
receiving new configuration information for carrying out the measurement; and
upon receipt of the new configuration information, replacing the configuration information previously received with the new configuration information and clearing the measurement of the network-performance related metric carried out consistent with the configuration information previously received.
17. The method according to claim 10, wherein the indication is transmitted to the network element in an RRCConnectionSetupComplete message.
18. A non-transitory computer-readable storage medium having stored thereon computer-executable instructions, the computer-executable instructions comprising instructions for performing the following:
accessing configuration information for carrying out a measurement,
carrying out the measurement of a network-performance related metric consistent with the configuration information when the device is connected to a cell or a public land mobile network (PLMN) authorized for the measurement to be performed, and
transmitting an indication of an availability of the measurement to a network element when the device is connected to a cell or PLMN included in a list comprising at least one reporting place authorized for reporting the measurement.
19. The non-transitory computer-readable storage medium according to claim 18, wherein the measurement is a logged-type measurement carried out in an idle mode of operation.
20. The non-transitory computer-readable storage medium according to claim 18, wherein the configuration information comprises at least one of a measurement validity time or a report validity time.
21. The non-transitory computer-readable storage medium according to claim 20, wherein the measurement of the network-performance related metric is stopped being carried out when the measurement validity time is over.
22. The non-transitory computer-readable storage medium according to claim 20, wherein the computer-executable instructions further comprise instructions for storing the measurement of the network-performance related metric during the report validity time.
23. The non-transitory computer-readable storage medium according to claim 22, wherein the computer-executable instructions further comprise instructions for deleting the measurement of the network-performance related metric when the report validity time is over.
24. The non-transitory computer-readable storage medium according to claim 18, wherein the computer-executable instructions further comprise instructions for:
receiving new configuration information for carrying out the measurement; and
upon receipt of the new configuration information, replacing the configuration information previously received with the new configuration information and clearing the measurement of the network-performance related metric carried out consistent with the configuration information previously received.
25. The non-transitory computer-readable storage medium according to claim 18, wherein the indication is transmitted to the network element in an RRCConnectionSetupComplete message.
26. A device configured to:
receive configuration information for carrying out a measurement, wherein the configuration information comprises a measurement validity time;
carry out the measurement of a network-performance related metric consistent with the configuration information, wherein the measurement is carried out when a cell or public land mobile network (PLMN) the device is connected to or located in is a cell or PLMN authorized for the measurement to be performed, and wherein the measurement is carried out until the measurement validity time is over; and
transmit an indication of an availability of the measurement to a network element, wherein the indication is transmitted when the cell or PLMN the device is connected to is a cell or PLMN included in a list that includes at least one reporting place authorized for reporting the measurement.
27. The device according to claim 26, wherein the device is at least one of a cellular telephone, a personal digital assistant device, or an internet-enabled wireless device.
28. The device according to claim 26, wherein the measurement is a logged-type measurement further carried out when the device is in an idle mode of operation.
29. The device according to claim 26, wherein the configuration information further comprises a report validity time.
30. The device according to claim 29, wherein the device is further configured to store the measurement of the network-performance related metric during the report validity time.
31. The device according to claim 30, wherein the device is further configured to delete the measurement of the network-performance related metric when the report validity time is over.
32. The device according to claim 26, wherein the device is further configured to receive new configuration information for carrying out the measurement; and, upon receipt of the new configuration information, replace the configuration information previously received with the new configuration information and clear the measurement of the network-performance related metric carried out consistent with the configuration information previously received.
33. The device according to claim 26, wherein the indication is transmitted to the network element in an RRCConnectionSetupComplete message.
34. A method comprising:
receiving configuration information for carrying out a measurement, wherein the configuration information comprises a measurement validity time;
carrying out the measurement of a network-performance related metric consistent with the configuration information, wherein the measurement is carried out when a cell or public land mobile network (PLMN) the device is connected to or located in is a cell or PLMN authorized for the measurement to be performed, and wherein the measurement is carried out until the measurement validity time is over; and
transmitting an indication of an availability of the measurement to a network element, wherein the indication is transmitted when the cell or PLMN the device is connected to is a cell or PLMN included in a list that includes at least one reporting place authorized for reporting the measurement.
35. The method according to claim 34, wherein the measurement is a logged-type measurement carried out in an idle mode of operation.
36. The method according to claim 34, wherein the configuration information further comprises a report validity time.
37. The method according to claim 36, further comprising storing the measurement of the network-performance related metric during the report validity time.
38. The method according to claim 37, further comprising deleting the measurement of the network-performance related metric when the report validity time is over.
39. The method according to claim 34, further comprising:
receiving new configuration information for carrying out the measurement; and
upon receipt of the new configuration information, replacing the configuration information previously received with the new configuration information and clearing the measurement of the network-performance related metric carried out consistent with the configuration information previously received.
40. The method according to claim 34, wherein the indication is transmitted to the network element in an RRCConnectionSetupComplete message.
41. A non-transitory computer-readable storage medium having stored thereon computer-executable instructions, the computer-executable instructions comprising instructions for performing the following:
accessing configuration information for carrying out a measurement, wherein the configuration information comprises a measurement validity time;
carrying out the measurement of a network-performance related metric consistent with the configuration information, wherein the measurement is carried out when a cell or public land mobile network (PLMN) the device is connected to or located in is a cell or PLMN authorized for the measurement to be performed, and wherein the measurement is carried out until the measurement validity time is over; and
transmitting an indication of an availability of the measurement to a network element, wherein the indication is transmitted when the cell or PLMN the device is connected to is a cell or PLMN included in a list that includes at least one reporting place authorized for reporting the measurement.
42. The non-transitory computer-readable storage medium according to claim 41, wherein the measurement is a logged-type measurement carried out in an idle mode of operation.
43. The non-transitory computer-readable storage medium according to claim 41, wherein the configuration information further comprises a report validity time.
44. The non-transitory computer-readable storage medium according to claim 43, further comprising storing the measurement of the network-performance related metric during the report validity time.
45. The non-transitory computer-readable storage medium according to claim 44, wherein the computer-executable instructions further comprise instructions for deleting the measurement of the network-performance related metric when the report validity time is over.
46. The non-transitory computer-readable storage medium according to claim 41, wherein the computer-executable instructions further comprise instructions for:
receiving new configuration information for carrying out the measurement; and
upon receipt of the new configuration information, replacing the configuration information previously received with the new configuration information and clearing the measurement of the network-performance related metric carried out consistent with the configuration information previously received.
47. The non-transitory computer-readable storage medium according to claim 41, wherein the indication is transmitted to the network element in an RRCConnectionSetupComplete message.
48. A device configured to:
receive configuration information for carrying out a measurement, wherein the configuration information comprises a measurement validity time and a report validity time;
carry out the measurement of a network-performance related metric consistent with the configuration information, wherein the measurement is carried out when a cell or public land mobile network (PLMN) the device is connected to or located in is a cell or PLMN authorized for the measurement to be performed, and wherein the measurement is carried out until the measurement validity time is over;
store the measurement of the network-performance related metric during the report validity time;
transmit an indication of an availability of the measurement to a network element, wherein the indication is transmitted when the cell or PLMN the device is connected to is a cell or PLMN included in a list that includes at least one reporting place authorized for reporting the measurement; and
delete the measurement of the network-performance related metric when the report validity time is over.
49. The device according to claim 48, wherein the device is at least one of a cellular telephone, a personal digital assistant device, or an internet-enabled wireless device.
50. The device according to claim 48, wherein the measurement is a logged-type measurement carried out when the device is in an idle mode of operation.
51. The device according to claim 48, wherein the device is further configured to receive new configuration information for carrying out the measurement; and, upon receipt of the new configuration information, replace the configuration information previously received with the new configuration information and clear the measurement of the network-performance related metric carried out consistent with the configuration information previously received.
52. The device according to claim 48, wherein the indication is transmitted to the network element in an RRCConnectionSetupComplete message.
53. A method comprising:
receiving configuration information for carrying out a measurement, wherein the configuration information comprises a measurement validity time and a report validity time;
carrying out the measurement of a network-performance related metric consistent with the configuration information, wherein the measurement is carried out when a cell or public land mobile network (PLMN) the device is connected to or located in is a cell or PLMN authorized for the measurement to be performed, and wherein the measurement is carried out until the measurement validity time is over;
storing the measurement of the network-performance related metric during the report validity time;
transmitting an indication of an availability of the measurement to a network element, wherein the indication is transmitted when the cell or PLMN the device is connected to is a cell or PLMN included in a list that includes at least one reporting place authorized for reporting the measurement; and
deleting the measurement of the network-performance related metric when the report validity time is over.
54. The method according to claim 53, wherein the measurement is a logged-type measurement carried out in an idle mode of operation.
55. The method according to claim 53, further comprising:
receiving new configuration information for carrying out the measurement; and
upon receipt of the new configuration information, replacing the configuration information previously received with the new configuration information and clear the measurement of the network-performance related metric carried out consistent with the configuration information previously received.
56. The method according to claim 53, wherein the indication is transmitted to the network element in an RRCConnectionSetupComplete message.
57. A non-transitory computer-readable storage medium having stored thereon computer-executable instructions, the computer-executable instructions comprising instructions for performing the following:
receiving configuration information for carrying out a measurement, wherein the configuration information comprises a measurement validity time and a report validity time;
carrying out the measurement of a network-performance related metric consistent with the configuration information, wherein the measurement is carried out when a cell or public land mobile network (PLMN) the device is connected to or located in is a cell or PLMN authorized for the measurement to be performed, and wherein the measurement is carried out until the measurement validity time is over;
storing the measurement of the network-performance related metric during the report validity time;
transmitting an indication of an availability of the measurement to a network element, wherein the indication is transmitted when the cell or PLMN the device is connected to is a cell or PLMN included in a list that includes at least one reporting place authorized for reporting the measurement; and
deleting the measurement of the network-performance related metric when the report validity time is over.
58. The non-transitory computer-readable storage medium according to claim 57, wherein the measurement is a logged-type measurement carried out in an idle mode of operation.
59. The non-transitory computer-readable storage medium according to claim 57, wherein the computer-executable instructions further comprise instructions for:
receiving new configuration information for carrying out the measurement; and
upon receipt of the new configuration information, replacing the configuration information previously received with the new configuration information and clear the measurement of the network-performance related metric carried out consistent with the configuration information previously received.
60. The non-transitory computer-readable storage medium according to claim 57, wherein the indication is transmitted to the network element in an RRCConnectionSetupComplete message.