Using a synchronized access channel to track a mobile device

1. One or more nontransitory computer-readable media having computer-executable instructions embodied thereon that, when executed, enable a mobile computing device to perform a method of reducing the time for a computing device to deliver a message to the mobile computing device, the method comprising:

at the mobile computing device, receiving a request to enter a tracking mode, said request received on a quick paging channel, wherein said request is responsive to a threshold period of time elapsing since the mobile computing device has communicated with a base station;

incident to receiving said request, transitioning to a tracking mode; and

via a slotted access channel, sending a location-change message that indicates that said mobile computing device has entered a new location, when said mobile computing device enters said new location.

2. The media of claim 1 , wherein the location-change message includes a two-bit portion.

3. The media of claim 2 , wherein the location-change message further includes two bits of redundancy.

4. The media of claim 1 , wherein the mobile computing device is assigned a slot on the slotted access channel, thereby providing a slot assignment.

5. The media of claim 4 , wherein the slot assignment is based on a mobile identifier.

6. The media of claim 4 , wherein said slot on the slotted access channel is dynamically assigned.

7. The media of claim 1 , further comprising dividing the slotted access channel into 2,400 four-bit slots each second.

8. The media of claim 1 , wherein said new location includes a new sector, wherein said sector is coverage area in a wireless telecommunications network.

9. The media of claim 1 further comprising, via the slotted access channel, sending a low-signal message that indicates that said mobile computing device detects a poor signal quality, when said mobile computing device detects a poor signal quality.

10. The media of claim 1 further comprising, via the slotted access channel, sending a low-battery message that indicates that said mobile computing device detects a low remaining battery capacity, when said mobile computing device detects a low remaining battery capacity.

11. One or more nontransitory computer-readable media having computer-executable instructions embodied thereon that, when executed, enable a mobile computing device to perform a method of reducing the time for a computing device to deliver a message to the mobile computing device, the method comprising:

at the mobile computing device, receiving a request to enter a tracking mode, said request received on a quick paging channel, wherein said request is responsive to a threshold period of time elapsing since the mobile computing device has communicated with a base station;

via a slotted access channel, sending a tracking-message acknowledgement, the mobile computing device being assigned a slot on the slotted access channel;

incident to receiving said request, transitioning to a tracking mode;

via a slotted access channel, sending a location-change message that indicates that said mobile computing device has entered a new location, when said mobile computing device enters said new location;

via the slotted access channel, sending a low-signal message that indicates that said mobile computing device detects a poor signal quality, when said mobile computing device detects a poor signal quality; and

via the slotted access channel, sending a low-battery message that indicates that said mobile computing device detects a low remaining battery capacity, when said mobile computing device detects a low remaining battery capacity.

12. The media of claim 11 , wherein the low-signal message includes a two-bit portion.

13. The media of claim 12 , wherein the low-signal messages further includes two bits of redundancy.

14. The media of claim 11 , wherein the low-battery message includes a two-bit portion.

15. The media of claim 14 , wherein the low-battery message further includes two bits of redundancy.

16. One or more nontransitory computer-readable media having computer-executable instructions embodied thereon that, when executed, enable a computing device to perform a method of reducing the time to deliver a message to a mobile computing device, the method comprising:

assigning the mobile computing device a slot on a slotted access channel by the computing device, each slot on said access channel being dynamically assigned based on a mobile identifier, identifying an associated mobile computing device;

sending from the computing device a tracking-mode-activation message to the mobile computing device, responsive to a threshold period of time elapsing since the mobile computing device has communicated with a base station, wherein said mobile computing device is configured to perform a process incident to receiving said message, wherein said process includes,

transitioning to a tracking mode, and

via a slotted access channel, sending a location-change message that indicates that said mobile computing device has entered a new location, when said mobile computing device enters a new location.

17. The media of claim 16 , wherein the threshold period of time is extended, responsive to the receipt at the computing device of a low-signal message from the mobile computing device, said low-signal message indicating that said mobile computing device has detected a poor signal quality.

18. The media of claim 17 , wherein the low-signal message is received over a slotted access channel.

19. The media of claim 16 , wherein the threshold period of time is extended, responsive to the receipt at the computing device of a low-battery message from the mobile computing device, said low-battery message indicating that said mobile computing device has detected a low remaining battery capacity.

20. The media of claim 19 , wherein the low-battery message is received over a slotted access channel.