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
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Technologies
Synchronization
Product
Use Cases
Wireless communication
Services
Claim
1. In a time division multiplex communication system, a method of distributing position location signals, the method comprising:
determining a timing, according to a time reference, of 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 that the synchronized position location slot includes position location information;
assigning to a first signal source, a first sub-slot within the synchronized position location slot with a first position location signal corresponding to the first signal source from the plurality of position location signal sources;
causing the transmission, from the first signal source, of the synchronized position location slot having the first position location signal and a blank sub-slot in at least a second sub-slot of the synchronized position location slot;
assigning to a second signal source a second sub-slot distinct from the first sub-slot with a second position location signal corresponding to the second signal source from the plurality of position location signal sources; and
causing the transmission, from the second signal source, of the synchronized position location slot having the second position location signal and a blank sub-slot in at least the first sub-slot of the synchronized position location slot.', 'determining a timing, according to a time reference, of 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 that the synchronized position location slot includes position location information;', 'a plurality of sub-slots assigned to a plurality of position location signal sources; and', 'an identifier indicating that the synchronized position location slot includes position location information;', 'assigning to a first signal source, a first sub-slot within the synchronized position location slot with a first position location signal corresponding to the first signal source from the plurality of position location signal sources;', 'causing the transmission, from the first signal source, of the synchronized position location slot having the first position location signal and a blank sub-slot in at least a second sub-slot of the synchronized position location slot;', 'assigning to a second signal source a second sub-slot distinct from the first sub-slot with a second position location signal corresponding to the second signal source from the plurality of position location signal sources; and', 'causing the transmission, from the second signal source, of the synchronized position location slot having the second position location signal and a blank sub-slot in at least the first sub-slot of the synchronized position location slot.
2. The method of claim 1, further comprising causing the configuration, in the first signal source, of blank sub-slots, in the synchronized position location slot, for sub-slots distinct from the first sub-slot.
3. The method of claim 1, wherein the second sub-slot is separated from the first sub-slot by at least a predetermined guard period.
4. The method of claim 1, wherein determining the timing of the synchronized position location slot comprises determining a slot timing based on a predetermined position location slot period.
5. The method of claim 1, wherein determining the timing of the synchronized position location slot comprises determining a slot timing based on a request for the synchronized position location slot.
6. The method of claim 1, wherein the identifier indicating the synchronized position location slot comprises a MAC address reserved for position location slots.
7. The method of claim 1, wherein the first position location signal corresponds to a pilot signal corresponding to the first signal source.
8. The method of claim 1, wherein the first position location signal corresponds to a pseudo noise (PN) sequence corresponding to the first signal source.
9. In a time division multiplex communication system, a method of transmitting position location signals, the method comprising:
transmitting, from a position location signal source, 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;
a position location signal corresponding to the signal source in a first sub-slot assigned to the signal source;
a second sub-slot distinct from the first sub-slot assigned to a second signal source; and
a blank sub-slot in the second sub-slot of the synchronized position location slot, wherein the second sub-slot is utilized, by a second signal source, for transmitting a second position location signal; and
transmitting at a predetermined slot time, from the position location signal source, the synchronized position location slot.', 'transmitting, from a position location signal source, 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;', 'a plurality of sub-slots assigned to a plurality of position location signal sources;', 'a position location signal corresponding to the signal source in a first sub-slot assigned to the signal source;', 'a second sub-slot distinct from the first sub-slot assigned to a second signal source; and', 'a blank sub-slot in the second sub-slot of the synchronized position location slot, wherein the second sub-slot is utilized, by a second signal source, for transmitting a second position location signal; and', 'transmitting at a predetermined slot time, from the position location signal source, the synchronized position location slot
10. The method of claim 9, wherein the synchronized position location slot includes a MAC address reserved for position location slots
11. The method of claim 9, wherein sub-slots, in the synchronized position location slot, not assigned to the position location signal source, are blank
12. The method of claim 9, wherein the position location signal sources comprises a base station in the communication system
13. A position location signal source for transmitting position location signals in a time multiplex communication system, the position location signal source comprising:
a ranging data module configured to generate a position location signal;
a slot processor configured to generate a synchronized position location slot having:
an address field;
a plurality of sub-slots assigned to a plurality of position location signal sources;
a first sub-slot assigned to the position location signal source;
a second sub-slot distinct from the first sub-slot containing null data, wherein the second sub-slot is utilized for transmitting a second position location signal by a second signal source; and
the address field configured to an address reserved for position location slots; and
an RF transceiver configured to transmit the synchronized position location slot at a predetermined time.', 'a ranging data module configured to generate a position location signal;', 'a slot processor configured to generate a synchronized position location slot having:
an address field;
a plurality of sub-slots assigned to a plurality of position location signal sources;
a first sub-slot assigned to the position location signal source;
a second sub-slot distinct from the first sub-slot containing null data, wherein the second sub-slot is utilized for transmitting a second position location signal by a second signal source; and
the address field configured to an address reserved for position location slots; and', 'an address field;', 'a plurality of sub-slots assigned to a plurality of position location signal sources;', 'a first sub-slot assigned to the position location signal source;', 'a second sub-slot distinct from the first sub-slot containing null data, wherein the second sub-slot is utilized for transmitting a second position location signal by a second signal source; and', 'the address field configured to an address reserved for position location slots; and', 'an RF transceiver configured to transmit the synchronized position location slot at a predetermined time.14. The apparatus of claim 13, wherein the position location signal comprises a pilot signal burst corresponding to a base station associated with the first sub-slot.15. The apparatus of claim 13, wherein the position location signal comprises a pseudo noise sequence corresponding to a base station associated with the first sub-slot.16. The apparatus of claim 13, wherein the address reserved for position location slots comprises a reserved MAC address.17. The apparatus of claim 13, wherein the RF transceiver is configured to receive a position location request and the ranging data module generates the position location signal in response to the position location request.18. A position location signal source for transmitting position location signals in a time multiplex communication system, the position location signal source comprising:
means for generating, in a position location signal source, a synchronized position location slot having:
a plurality of sub-slots assigned to a plurality of position location signal sources;
a position location signal, corresponding to the position location signal source, in a first sub-slot assigned to the position location signal source, the first sub-slot being one of the plurality of sub-slots; and
a second sub-slot, distinct from the first sub-slot, containing null data, the second sub-slot being one of the plurality of sub-slots, and wherein the second sub-slot is utilized for transmitting a second position location signal by a second signal source; and
means for transmitting at a predetermined slot time, the synchronized position location slot.', 'means for generating, in a position location signal source, a synchronized position location slot having:
a plurality of sub-slots assigned to a plurality of position location signal sources;
a position location signal, corresponding to the position location signal source, in a first sub-slot assigned to the position location signal source, the first sub-slot being one of the plurality of sub-slots; and
a second sub-slot, distinct from the first sub-slot, containing null data, the second sub-slot being one of the plurality of sub-slots, and wherein the second sub-slot is utilized for transmitting a second position location signal by a second signal source; and', 'a plurality of sub-slots assigned to a plurality of position location signal sources;', 'a position location signal, corresponding to the position location signal source, in a first sub-slot assigned to the position location signal source, the first sub-slot being one of the plurality of sub-slots; and', 'a second sub-slot, distinct from the first sub-slot, containing null data, the second sub-slot being one of the plurality of sub-slots, and wherein the second sub-slot is utilized for transmitting a second position location signal by a second signal source; and', 'means for transmitting at a predetermined slot time, the synchronized position location slot.19. The position location signal source of claim 18, wherein the means for generating the synchronized position location slot is configured to generate null data in each of the sub-slots distinct from the first sub-slot.
20. The apparatus of claim 18, wherein the means for generating the synchronized position location slot is configured to generate an address configured to a MAC address reserved for position location.
21. In a time division multiplex communication system, a computer-readable medium including program code stored thereon, comprising program code to distribute position location signals, comprising:
program code to determine a timing, according to a time reference, of 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 that the synchronized position location slot includes position location information;
program code to assign to a first signal source, a first sub-slot within the synchronized position location slot with a first position location signal corresponding to the first signal source from the plurality of position location signal sources;
program code to cause the transmission, from the first signal source, of the synchronized position location slot having the first position location signal and a blank sub- slot in at least a second sub-slot of the synchronized position location slot;
program code to assign to a second signal source a second sub-slot distinct from the first sub-slot with a second position location signal corresponding to the second signal source from the plurality of position location signal sources; and
program code to cause the transmission, from the second signal source, of the synchronized position location slot having the second position location signal and a blank sub-slot in at least the first sub-slot of the synchronized position location slot.', 'program code to determine a timing, according to a time reference, of 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 that the synchronized position location slot includes position location information;', 'a plurality of sub-slots assigned to a plurality of position location signal sources; and', 'an identifier indicating that the synchronized position location slot includes position location information;', 'program code to assign to a first signal source, a first sub-slot within the synchronized position location slot with a first position location signal corresponding to the first signal source from the plurality of position location signal sources;', 'program code to cause the transmission, from the first signal source, of the synchronized position location slot having the first position location signal and a blank sub- slot in at least a second sub-slot of the synchronized position location slot;', 'program code to assign to a second signal source a second sub-slot distinct from the first sub-slot with a second position location signal corresponding to the second signal source from the plurality of position location signal sources; and', 'program code to cause the transmission, from the second signal source, of the synchronized position location slot having the second position location signal and a blank sub-slot in at least the first sub-slot of the synchronized position location slot.']
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