1. A storage device, the storage device comprising:
a readwrite head assembly disposed in relation to a storage medium, wherein the readwrite head assembly includes a sensor operable to provide a sensor output indicating contact between the readwrite head assembly and the storage medium and a write head; and
an interference mitigated touch down circuit operable to:
estimate an interference in the sensor output from the write head, wherein estimating the interference in the sensor output includes calculating a coherent output based upon two or more instances of the sensor output; and
remove the interference from the sensor output to yield a filtered output.
2. The storage device of claim 1, wherein the storage device further comprises:
the storage medium.
3. The storage device of claim 1, wherein the interference mitigated touch down circuit is further operable to:
determine a contact between the storage medium and the readwrite head assembly based on the filtered output; and
provide a contact output.
4. The storage device of claim 1, wherein estimating the interference in the sensor output further comprises:
calculating a least mean squared value based at least in part on the coherent output.
5. The storage device of claim 4, wherein the coherent output is a running average of the two or more instances of the sensor output.
6. The storage device of claim 4, wherein estimating the interference in the sensor output further comprises:
transforming the dimension of the coherent output from a first space to a second space; and
wherein calculating a least mean squared value is based at least in part on the coherent output transformed to the second space.
7. The storage device of claim 6, wherein the first dimension is a power of P.
8. The storage device of claim 7, wherein the value of P is nine.
9. The storage device of claim 1, wherein removing the interference from the sensor output comprises:
subtracting the interference from the sensor output to yield the filtered output.
10. The storage device of claim 1, wherein the interference mitigated touch down circuit is implemented as part of a semiconductor device.
11. The storage device of claim 1, wherein the storage device is a hard disk drive.
12. The storage device of claim 1, wherein the sensor output changes as a function of a temperature of the readwrite head assembly.
13. A contact detection system, the system comprising:
an interference mitigated touch down circuit operable to:
receive a sensor output indicating a contact between a readwrite head assembly and a storage medium;
estimate an interference in the sensor output from a write head included in the readwrite head assembly, wherein estimating the interference in the sensor output includes:
calculating a coherent output based upon two or more instance of the sensor output; and
calculating a least mean squared value based at least in part on the coherent output; and
remove the interference from the sensor output to yield a filtered output.
14. The contact detection system of claim 13, wherein the contact detection system is implemented as part of a semiconductor device.
15. The contact detection system of claim 13, wherein the contact detection system is implemented as part of a storage device, and wherein the storage device further comprises:
a storage medium; and
a readwrite head assembly disposed in relation to the storage medium, wherein the readwrite head assembly includes a sensor operable to provide the sensor output indicating contact between the readwrite head assembly and the storage medium.
16. The contact detection system of claim 13, wherein the interference mitigated touch down circuit is further operable to:
determine a contact between the storage medium and the readwrite head assembly based on the filtered output; and
provide a contact output.
17. The contact detection system of claim 13, wherein the coherent output is a running average of the two or more instances of the sensor output.
18. The contact detection system of claim 13, wherein removing the interference from the sensor output comprises:
subtracting the interference from the sensor output to yield the filtered output.
19. A method for contact detection, the method comprising:
providing a readwrite head assembly including a contact sensor and a write head;
moving the readwrite head a first distance from a storage medium, wherein no contact between the readwrite head assembly and the storage medium occurs;
receiving a sensor output from the contact sensor, wherein the sensor output changes as a function of a temperature of the readwrite head assembly;
estimating an interference in the sensor output from the write head; and
moving the readwrite head a second distance from a storage medium, wherein contact between the readwrite head assembly and the storage medium is possible; and
removing the interference from the sensor output to yield a filtered output.
20. The method of claim 19, wherein estimating the interference in the sensor output comprises:
calculating a coherent output based upon two or more instance of the sensor output; and
calculating a least mean squared value based at least in part on the coherent output.
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. An apparatus, comprising:
a memory to store executable instructions; and
a processor, coupled to the memory, that facilitates execution of the executable instructions to perform operations, comprising:
monitoring a first state of a first user service activity and a second state of a second user service activity determined to be executing on a mobile device, wherein the first user service activity is a voice service and the second user service activity is a data service;
initiating storage of the first state of the first user service activity and the second state of the second user service activity to a network device of a network;
communicating, to other network devices of the network, location data representing a location of policy record information of the network device, wherein the first state of the first user service activity and the second state of the second user service activity are stored at the location; and
communicating the first state of the first user service activity and the second state of the second user service activity to mobile services managed by the other network devices based on respective requests for information of the policy record information at the location, wherein the communicating the first state and the second state comprises reducing an amount of signaling between the apparatus and the other network devices.
2. The apparatus of claim 1, wherein the operations further comprise receiving information related to the second state of the second user service activity determined to be executing on the mobile device, and wherein the mobile device is located in a first geographic area.
3. The apparatus of claim 2, wherein the operations further comprise providing direct support for the mobile device in the first geographic area and indirect support for other mobile devices located in a second geographic area, and wherein a first portion of the first geographic area and a second portion of the second geographic area comprise a common area.
4. The apparatus of claim 1, wherein the operations further comprise preventing access to topology data representing a topology of home network devices of a home network by roaming network devices of a roaming network.
5. The apparatus of claim 1, wherein the first user service activity comprises a first activity and a second activity for the mobile device.
6. The apparatus of claim 1, wherein the first user service activity comprises a set of services provided to the mobile device.
7. The apparatus of claim 1, wherein the first user service activity is performed by different network devices of the network.
8. A method, comprising:
tracking, by a system comprising a processor, a first set of first user session data associated with a first session for a device and a second set of second user session data associated with a second session for the device, wherein the first session is a voice session and the second session is a data session;
temporarily caching, by the system, the first set of first user session data and the second set of second user session data;
sending, by the system, the first set of first user session data and the second set of second user session data to a data store associated with a network device of a network;
generating, by the system, data that references a location of the first set of first user session data and the second set of second user session data within the data store associated with the network device; and
communicating, by the system, the first set of first user session data and the second set of second user session data to other network devices of the network based on a request, from the other network devices, that comprises the location, wherein the communicating comprises decreasing policy signaling related traffic among the other network devices.
9. The method of claim 8, further comprising:
receiving, by the system, an indication of a third session for the device;
obtaining, by the system, the first set of first user session data and the second set of second user session data from the data store; and
applying, by the system, the first set of first user session data to the third session for the device, wherein the third session is determined to be executing on the device.
10. The method of claim 8, further comprising:
pushing, by the system, session record information of the first set of first user session data to a gateway device for authorized access.
11. The method of claim 10, wherein the pushing comprises providing the session record information to at least one of a network element, an application, a resource, or another gateway device.
12. The method of claim 8, further comprising associating, by the system, the first set of first user session data with policy record information.
13. The method of claim 8, further comprising communicating, by the system, with a roaming device of a roaming network, wherein the communicating blocks access to topology data representing a home network topology by the roaming device.
14. The method of claim 8, further comprising generating, by the system, a session record for the first set of first user session data, wherein the session record comprises an identification of the device and associated network elements.
15. The method of claim 8, further comprising facilitating by the system, routing between network devices and devices of at least five service zones.
16. A computer-readable storage device comprising executable instructions that, in response to execution, cause a system comprising a processor to perform operations, comprising:
monitoring a first set of first user service activities of a device determined to be occurring within a first geographic region, wherein the first set of first user service activities are related to a voice service;
monitoring a second set of second user service activities of the device determined to be occurring within the first geographic region, wherein the second set of second user services activities are related to a data service;
initiating storage of the first set of first user service activities and the second set of second user service activities to an identifiable location of a network data store; and
applying a user service activity of the first set of first user service activities and the second set of second user service activities to a subsequent user session in response to determining the device is within a second geographic region and based on a request to access information stored at the identifiable location of the network data store, wherein the applying comprises mitigating an amount of signaling used to provide the subsequent user session.
17. The computer-readable storage device of claim 16, wherein the operations further comprise providing backup support for a network device of a network, wherein the network device monitors a third set of third user service activities associated with the second geographic region, and wherein a portion of the first geographic region and another portion of the second geographic region overlap.
18. The computer-readable storage device of claim 17, wherein the backup support provides geographic redundancy for the use of a policy as a network service.
19. The computer-readable storage device of claim 16, wherein the operations further comprise generating a reference to active policy record information stored by a network device of a network.
20. The computer-readable storage device of claim 16, wherein the operations further comprise communicating the first set of first user service activities and the second set of second user service activities to a network device of a network, and wherein the network device performs a function related to policy and charging functions.