Method and apparatus for estimating the position of a terminal based on identification codes for transmission sources
First Claim
1. A method for determining the location of a device in a wireless communication system, comprising:
- receiving from a transmission source a first signal having included therein transmitted data and a second signal having included therein an identification code assigned to the transmission source;
processing the second signal to recover the identification code; and
determining a position estimate of the device based on the recovered identification code.
1 Assignment
0 Petitions
Accused Products
Abstract
Techniques to determine the position of a terminal under the coverage of a repeater in a wireless communication system. In an aspect, an identification code is transmitted for each repeater and used by the terminal (or a PDE) to unambiguously identify the repeater. The identification codes for the repeaters in the system can be implemented with PN sequences at defined offsets that are specifically reserved for repeater identification. In another aspect, the identification code for each repeater is transmitted using a spread-spectrum signal designed to have minimal impact on the performance of the system and to be recoverable by the terminal in similar manner as for a forward modulated signal. In this way, no additional hardware is required for the terminal to recover the identifier signal. In one specific design, the spread spectrum identifier signal is generated in accordance with and conforms to the IS-95 CDMA standard.
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Citations
67 Claims
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1. A method for determining the location of a device in a wireless communication system, comprising:
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receiving from a transmission source a first signal having included therein transmitted data and a second signal having included therein an identification code assigned to the transmission source;
processing the second signal to recover the identification code; and
determining a position estimate of the device based on the recovered identification code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 37, 38, 40, 41, 42, 43)
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23. A method for generating a signal suitable for use to estimate the location of a device in a wireless communication system, comprising:
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receiving at a transmission source a first signal having included therein transmitted data;
generating at the transmission source a second signal having included therein an identification code assigned to the transmission source;
combining the first and second signals to provide a combined signal; and
transmitting the combined signal from the transmission source.
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36. A method for generating a signal suitable for use to estimate the location of a terminal in a wireless communication system, comprising:
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receiving and processing at a transmission source a first signal having included therein transmitted data;
generating a second signal having included therein an identification code assigned to the transmission source;
transmitting the first signal from the transmission source; and
transmitting the second signal to a plurality of terminals within the communication system.
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39. A method for determining the location of a terminal in a wireless communication system, comprising:
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receiving at the terminal an indication for a particular identification code assigned to a transmission source;
receiving from the transmission source a first signal having included therein transmitted data and a second signal having included therein the identification code; and
processing the second signal to recover the identification code, and wherein the recovered identification code is used to identify the transmission source, and wherein the location of the terminal is estimated based on a position estimate associated with the identification code.
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44. A transmission unit in a wireless communication system, comprising:
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a first unit operative to receive, condition, and retransmit signals on both forward and reverse links of the communication system; and
a second unit coupled to the first unit and including a first module operative to receive and process a first signal on the forward link having included therein transmitted data, a second module operative to generate a second signal having included therein an identification code assigned to the transmission unit, and a third module operative to combine the first and second signals to provide a combined signal for transmission from the transmission unit. - View Dependent Claims (45, 46, 49)
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47. A communication terminal including:
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a receiver capable of receiving signals transmitted by a repeater and signals that were not transmitted by a repeater; and
a processor for determining whether received signals were transmitted by a repeater or not, the processor further capable of ensuring that signals received from a repeater not be used in determining the position of the communication terminal.
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48. A method for preventing signals transmitted through a repeater of a communication system from affecting a position determination, including:
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receiving signals transmitted by a repeater and signals that were not transmitted by a repeater;
determining whether received signals were transmitted by a repeater or not; and
ensuring that signals received from a repeater not be used in determining the position of the communication terminal.
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50. A method for preventing signals transmitted through a repeater of a communication system from affecting a position determination, including:
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receiving signals transmitted by a repeater and signals that were not transmitted by a repeater;
transmitting information regarding the received signals, including an identification code which determines whether received signals were transmitted by a repeater or not; and
ensuring that information related to signals received from a repeater is not used in determining the position of the communication terminal.
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51. A method for determining the location of a device in a wireless communication system, comprising:
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receiving from a first transmission source a first signal having included therein transmitted data and a second signal having included therein a first identification code assigned to the first transmission source, wherein the first identification code is selected from among a list of identification codes used for nearby transmission sources;
processing the second signal to recover the first identification code; and
determining a position estimate of the device based on the recovered first identification code. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59)
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60. A wireless terminal comprising:
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a receiver operative to receive from a first transmission source a first signal having included therein transmitted data and a second signal having included therein a first identification code assigned to the first transmission source, wherein the first identification code is selected from among a list of identification codes used for nearby transmission sources; and
a processor operative to process the second signal to recover the first identification code, wherein a position estimate of the terminal is determined based on the recovered first identification code. - View Dependent Claims (61)
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62. A method for determining the location of a device in a wireless communication system, comprising:
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receiving from a transmission source a signal having included therein transmitted data, wherein the signal is further processed based on an identification code assigned to the transmission source;
processing the signal to recover the identification code; and
determining a position estimate of the device based on the recovered identification code. - View Dependent Claims (63, 64, 65)
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66. A transmission unit in a wireless communication system, comprising:
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a first unit operative to receive and process a first signal having included therein transmitted data, and to generate a second signal having included therein an identification code assigned to the transmission unit, and a second unit coupled to the first unit and operative to receive and modulate the first signal with the second signal to provide a modulated signal for transmission from the transmission unit, and wherein the identification code is used for position determination.
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67. A wireless terminal comprising:
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a receiver operative to receive from a transmission source a first signal having included therein transmitted data, wherein the first signal is further modulated with a second signal having included therein an identification code assigned to the transmission source, and wherein the receiver is further operative to process the first signal to recover the second signal; and
a processor operative to process the second signal to recover the identification code, wherein a position estimate of the terminal is determined based on the recovered identification code.
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Specification