Abstract
A method and apparatus for generating and use of a position location reference signal that allows a receiver to receive position location signals from relatively weak signal generators when in the presence of a strong signal source. The position location reference signals from multiple sources can be synchronized to occur within a scheduled time slot of a time division multiplexed communication system. During the scheduled time slot each signal source can configure a transmission that includes a media access control address that corresponds to a value reserved for position location signals. Each signal source also configures the transmission to include a position location reference signal that corresponds to the signal source. The position location signals from each of the signal sources is positioned to occur at a time within the data portion of the scheduled time slot that no neighboring signal source transmits its corresponding position location signal.
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Specification Information
Specification Information
Technologies
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Technologies
Synchronization
Product
Use Cases
Wireless communication
Services
Claim
1. A method of determining a position of a mobile device in a time division multiplexed communication system, the method comprising:
receiving a synchronized position location slot, wherein the synchronized position location slot includes a plurality of sub-slots assigned to a plurality of position location signal sources, and an identifier indicating the synchronized position location slot includes position location information, the synchronized position location slot having a first position location signal corresponding to a first position location signal source in a first sub-slot and a blank sub-slot from a second position location signal source in at least the first sub-slot;
determining from the first sub-slot in the synchronized position location slot, the first position location signal corresponding to the first position location signal source;
determining from a second sub-slot in the synchronized position location slot, a second position location signal corresponding to the second position location signal source; and
determining a timing related to position based on the first and the second position location signals.', 'receiving a synchronized position location slot, wherein the synchronized position location slot includes a plurality of sub-slots assigned to a plurality of position location signal sources, and an identifier indicating the synchronized position location slot includes position location information, the synchronized position location slot having a first position location signal corresponding to a first position location signal source in a first sub-slot and a blank sub-slot from a second position location signal source in at least the first sub-slot;', 'determining from the first sub-slot in the synchronized position location slot, the first position location signal corresponding to the first position location signal source;', 'determining from a second sub-slot in the synchronized position location slot, a second position location signal corresponding to the second position location signal source; and', 'determining a timing related to position based on the first and the second position location signals.
2. The method of claim 1, wherein the identifier comprises a MAC address reserved for position location that is distinct from every MAC address corresponding to any receiver in coverage areas supported by the first position location signal source and the second location signal source.
3. The method of claim 1, wherein the first position location signal comprises a pilot burst from the first position location signal source and the second position location signal comprises a pilot burst from the second position location signal source.
4. The method of claim 1, wherein the first position location signal comprises a PN sequence corresponding to the first position location signal source.
5. The method of claim 1, wherein the first sub-slot is separated in time from the second sub-slot by a predetermined guard period.
6. The method of claim 1, wherein the second sub-slot immediately follows the first sub-slot.
7. The method of claim 1, wherein the second position location signal is received during a period of time in which the first position location signal source transmits no symbols.
8. The method of claim 1, further comprising transmitting the timing related to position based on the first and the second position location signals to a position location center.
9. An apparatus for determining a position of a mobile device in a time division multiplexed communication system, comprising:
means for receiving a synchronized position location slot, wherein the synchronized position location slot includes a plurality of sub-slots assigned to a plurality of position location signal sources, and an identifier indicating the synchronized position location slot includes position location information, the synchronized position location slot having a first position location signal corresponding to a first position location signal source in a first sub-slot and a blank sub-slot from a second position location signal source in at least the first sub-slot;
means for determining, from the first sub-slot in the synchronized position location slot, the first position location signal corresponding to the first position location signal source;
means for determining, from a second sub-slot in the synchronized position location slot, a second position location signal corresponding to the second position location signal source; and
means for determining a timing related to position based on the first and the second position location signals.', 'means for receiving a synchronized position location slot, wherein the synchronized position location slot includes a plurality of sub-slots assigned to a plurality of position location signal sources, and an identifier indicating the synchronized position location slot includes position location information, the synchronized position location slot having a first position location signal corresponding to a first position location signal source in a first sub-slot and a blank sub-slot from a second position location signal source in at least the first sub-slot;', 'means for determining, from the first sub-slot in the synchronized position location slot, the first position location signal corresponding to the first position location signal source;', 'means for determining, from a second sub-slot in the synchronized position location slot, a second position location signal corresponding to the second position location signal source; and', 'means for determining a timing related to position based on the first and the second position location signals
10. The apparatus of claim 9, wherein the identifier comprises a MAC address reserved for position location that is distinct from every MAC address corresponding to any receiver in coverage areas supported by the first position location signal source and the second location signal source
11. The apparatus of claim 9, wherein the first position location signal comprises a pilot burst from the first position location signal source and the second position location signal comprises a pilot burst from the second position location signal source
12. The apparatus of claim 9, wherein the first position location signal comprises a PN sequence corresponding to the first position location signal source
13. The apparatus of claim 9, wherein the first sub-slot is separated in time from the second sub-slot by a predetermined guard period
14. The apparatus of claim 9, wherein the second sub-slot immediately follows the first sub-slot
15. The apparatus of claim 9, wherein the second position location signal is received during a period of time in which the first position location signal source transmits no symbols
16. The apparatus of claim 9, further comprising transmitting the timing related to position based on the first and the second position location signals to a position location center
17. A computer-readable medium including program code, stored thereon, to determine a position of a mobile device in a time division multiplexed communication system, comprising:
program code to receive a synchronized position location slot, wherein the synchronized position location slot includes a plurality of sub-slots assigned to a plurality of position location signal sources, and an identifier indicating the synchronized position location slot includes position location information, the synchronized position location slot having a first position location signal corresponding to a first position location signal source in a first sub-slot and a blank sub-slot from a second position location signal source in at least the first sub-slot;
program code to determine from the first sub-slot in the synchronized position location slot, the first position location signal corresponding to the first position location signal source;
program code to determine from a second sub-slot in the synchronized position location slot, a second position location signal corresponding to the second position location signal source; and
program code to determine a timing related to position based on the first and the second position location signals.', 'program code to receive a synchronized position location slot, wherein the synchronized position location slot includes a plurality of sub-slots assigned to a plurality of position location signal sources, and an identifier indicating the synchronized position location slot includes position location information, the synchronized position location slot having a first position location signal corresponding to a first position location signal source in a first sub-slot and a blank sub-slot from a second position location signal source in at least the first sub-slot;', 'program code to determine from the first sub-slot in the synchronized position location slot, the first position location signal corresponding to the first position location signal source;', 'program code to determine from a second sub-slot in the synchronized position location slot, a second position location signal corresponding to the second position location signal source; and', 'program code to determine a timing related to position based on the first and the second position location signals.18. The computer-readable medium of claim 17, wherein the identifier comprises a MAC address reserved for position location that is distinct from every MAC address corresponding to any receiver in coverage areas supported by the first position location signal source and the second location signal source.19. The computer-readable medium of claim 17, wherein the first position location signal comprises a pilot burst from the first position location signal source and the second position location signal comprises a pilot burst from the second position location signal source.
20. The computer-readable medium of claim 17, wherein the first position location signal comprises a PN sequence corresponding to the first position location signal source.
21. The computer-readable medium of claim 17, wherein the first sub-slot is separated in time from the second sub-slot by a predetermined guard period.
22. The computer-readable medium of claim 17, wherein the second sub-slot immediately follows the first sub-slot.
23. The computer-readable medium of claim 17, wherein the second position location signal is received during a period of time in which the first position location signal source transmits no symbols.
24. The computer-readable medium of claim 17, further comprising program code to transmit the timing related to position based on the first and the second position location signals to a position location center.
25. An apparatus for determining a position of a mobile device in a time division multiplexed communication system, comprising:
An RF frontend for receiving a synchronized position location slot, wherein the synchronized position location slot includes a plurality of sub-slots assigned to a plurality of position location signal sources, and an identifier indicating the synchronized position location slot includes position location information, the synchronized position location slot having a first position location signal corresponding to a first position location signal source in a first sub-slot and a blank sub-slot from a second position location signal source in at least the first sub-slot; and
a baseband processor for:
determining from the first sub-slot in the synchronized position location slot, the first position location signal corresponding to the first position location signal source;
determining from a second sub-slot in the synchronized position location slot, a second position location signal corresponding to the second position location signal source; and
determining a timing related to position based on the first and the second position location signals.', 'An RF frontend for receiving a synchronized position location slot, wherein the synchronized position location slot includes a plurality of sub-slots assigned to a plurality of position location signal sources, and an identifier indicating the synchronized position location slot includes position location information, the synchronized position location slot having a first position location signal corresponding to a first position location signal source in a first sub-slot and a blank sub-slot from a second position location signal source in at least the first sub-slot; and', 'a baseband processor for:
determining from the first sub-slot in the synchronized position location slot, the first position location signal corresponding to the first position location signal source;
determining from a second sub-slot in the synchronized position location slot, a second position location signal corresponding to the second position location signal source; and
determining a timing related to position based on the first and the second position location signals.', 'determining from the first sub-slot in the synchronized position location slot, the first position location signal corresponding to the first position location signal source;', 'determining from a second sub-slot in the synchronized position location slot, a second position location signal corresponding to the second position location signal source; and', 'determining a timing related to position based on the first and the second position location signals.
26. The apparatus of claim 25, wherein the identifier comprises a MAC address reserved for position location that is distinct from every MAC address corresponding to any receiver in coverage areas supported by the first position location signal source and the second location signal source.
27. The apparatus of claim 25, wherein the first position location signal comprises a pilot burst from the first position location signal source and the second position location signal comprises a pilot burst from the second position location signal source.
28. The apparatus of claim 25, wherein the first position location signal comprises a PN sequence corresponding to the first position location signal source.
29. The apparatus of claim 25, wherein the first sub-slot is separated in time from the second sub-slot by a predetermined guard period.
30. The apparatus of claim 25, wherein the second sub-slot immediately follows the first sub-slot.
31. The apparatus of claim 25, wherein the second position location signal is received during a period of time in which the first position location signal source transmits no symbols.
32. The apparatus of claim 25, further comprising the RF frontend for transmitting the timing related to position based on the first and the second position location signals to a position location center.
33. The method of claim 1, wherein the synchronized position location slot has a blank sub-slot from the first position location signal source in at least the second sub-slot.']
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