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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| Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
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Specification Information
Specification Information
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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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: synchronizing a plurality of position location signal sources to a time reference; determining a timing of a position location slot having a plurality of sub- slots; configuring the position location slot with an identifier indicating the position location slot includes position location information; configuring in a first signal source a first sub-slot with a first position location signal corresponding to the first signal source from the plurality of position location signal sources; and transmitting, with the first signal source, the position location slot having the position location signal.
2. The method of claim 1, further comprising configuring, in the first signal source, blank sub-slots in the position location slot for sub-slots distinct from the first sub-slot.
3. The method of claim 1 , further comprising: configuring in 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; configuring, in the second signal source, a blank sub-slot in at least the first sub-slot; and transmitting, with the second signal source, the position location slot.
4. The method of claim 3, wherein the second sub-slot is separated from the first sub-slot by at least a predetermined guard period.
5. The method of claim 1, wherein determining the timing of the position location slot comprises determining a slot timing based on a predetermined position location slot period.
6. The method of claim 1, wherein determining the timing of the position location slot comprises determining a slot timing based on a request for the position location slot.
7. The method of claim 1, wherein configuring the position location slot with the identifier comprises configuring the position location slot with a MAC address reserved for position location slots.
8. The method of claim 1, wherein the first position location signal corresponds to a pilot signal corresponding to the first signal source.
9. The method of claim 1, wherein the first position location signal corresponds to a pseudo noise (PN) sequence corresponding to the first signal source
10. In a time division multiplex communication system, a method of distributing position location signals, the method comprising: generating, in each of a plurality of signal sources a corresponding position location slot having a plurality of sub-slots, each of the corresponding position location slots having a position location signal corresponding to the signal source in a sub-slot assigned to the signal source; and transmitting at a predetermined slot time, from each of the plurality of signal sources, the corresponding position location slot
11. The method of claim 10, wherein each of the plurality of position location slots includes a MAC address reserved for position location slots
12. The method of claim 10, wherein each of the plurality of signal sources blanks sub-slots in the corresponding position location slots for which it is not assigned
13. The method of claim 10, wherein each of the plurality of signal sources comprises a base station in the communication system
14. A method of determining position in a time division multiplexed communication system, the method comprising: receiving a slot having an identifier indicating the slot includes position location information; determining from a first sub-slot in the slot, a first position location signal corresponding to a first position location signal source; determining from a second sub-slot in the slot, a second position location signal corresponding to a second position location signal source; and determining a timing related to position based on the first and second position location signals
15. The method of claim 14, wherein the identifier comprises a MAC address reserved for position location
16. The method of claim 14, wherein the first position location signal comprises a pilot burst from the first position location signal source
17. The method of claim 14, wherein the first position location signal comprises a PN sequence corresponding to the first position location signal source
18. The method of claim 14, wherein the first sub-slot is separated in time from the second sub-slot by a predetermined guard period
19. The method of claim 14, wherein the second sub-slot immediately follows the first sub-slot.
20. The method of claim 14, wherein the second position location signal is received during a period of time in which the first position location signal source transmits no symbols.
21. The method of claim 14, further comprising transmitting the timing related to position based on the first and second position location signals to a position location center.
22. An apparatus for transmitting position location signals in a time multiplex communication system, the apparatus comprising: a ranging data module configured to generate a position location signal; a slot processor configured to generate a position location slot having an address field and a plurality of sub-slots, at least a first sub-slot assigned to the position location signal and at least a second sub-slot distinct from the first sub-slot containing null data, and the address field configured to an address reserved for position location slots; and an RF transceiver configured to transmit the position location slot at a predetermined time.
23. The apparatus of claim 22, wherein the position location signal comprises a pilot signal burst corresponding to a base station associated with the first sub-slot.
24. The apparatus of claim 22, wherein the position location signal comprises a pseudo noise sequence corresponding to a base station associated with the first sub-slot.
25. The apparatus of claim 22, wherein the address reserved for position location slots comprises a reserved MAC address.
26. The apparatus of claim 22, 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 request.
27. An apparatus for extracting position location signals from a time multiplex communication signal, the apparatus comprising: an RF frontend configured to receive a composite position location slot having sub-slot information transmitted by a plurality of distinct signal sources; an address decoder configured to decode an address within the composite position location slot; and a timing module configured to extract a plurality of position location signals from the composite position location slot, each position location signal extracted from a sub-slot corresponding to a one of the plurality of distinct signal sources.
28. The apparatus of claim 27, wherein the address decoder is configured to decode a MAC address reserved for position location slots.
29. The apparatus of claim 27, wherein the timing module is configured to determine a time offset corresponding to each of the plurality of position location signals.
30. An apparatus for transmitting position location signals in a time multiplex communication system, the apparatus comprising: means for generating, in each of a plurality of signal sources, a corresponding position location slot having a plurality of sub-slots, each of the corresponding position location slots having a position location signal corresponding to the signal source in a sub-slot assigned to the signal source; and means for transmitting at a predetermined slot time, from each of the plurality of signal sources, the corresponding position location slot.
31. The apparatus of claim 30, wherein the means for generating the corresponding position location slot is configured to generate null data in each of the sub-slots distinct from the sub-slot assigned to the signal source.
32. The apparatus of claim 30, wherein the means for generating the corresponding position location slot configures an address in the corresponding position location slot to a MAC address reserved for position location.
33. An apparatus for extracting position location signals from a time multiplex communication signal, the apparatus comprising: means for receiving a composite position location slot having sub-slot information transmitted by a plurality of distinct signal sources; means for decoding an address contained in the composite position location slot; and means for extracting a plurality of position location signals from the composite position location slot, each position location signal extracted from a sub-slot corresponding to a one of the plurality of distinct signal sources.
34. The apparatus of claim 33, further comprising means for buffering the sub-slot information.
35. The apparatus of claim 33, wherein the means for extracting the plurality of position location signals operates on the composite position location slot if the address corresponds to an address reserved for position location slots.']
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
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