Method and apparatus for generating reference signals for accurate time-difference of arrival estimation
First Claim
1. A method in a wireless terminal, the method comprising:
- receiving a subframe that contains a positioning reference signal (“
PRS”
) based on information signaled from a serving base station, the subframe comprising Orthogonal Frequency-Division Multiplexing (“
OFDM”
) symbols over which a transmission corresponds to resource elements arranged on a subcarrier-OFDM symbol grid, wherein the subframe that contains PRS is transmitted by a first base station;
determining symbols that constitute the PRSs within the received subframe based on at least one of;
a subframe type, a cyclic prefix type, and a number of transmit antennas used by the first base station; and
estimating a time of arrival of the received subframe based on the PRS contained in the received subframe.
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Accused Products
Abstract
A base station communicates a positioning reference signal (PRS) to wireless communication devices over a downlink in a wireless communication system by encoding a PRS into a first set of transmission resources, encoding other information into a second set of transmission resources, multiplexing the two sets of resources into a subframe such that the first set of resources is multiplexed into at least a portion of a first set of orthogonal frequency division multiplexed (OFDM) symbols based on an identifier associated with the base station and the second set of resources is multiplexed into a second set of OFDM symbols. Upon receiving the subframe, a wireless communication device determines which set of transmission resources contains the PRS based on the identifier associated with the base station that transmitted the subframe and processes the set of resources containing the PRS to estimate timing (e.g., time of arrival) information.
116 Citations
17 Claims
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1. A method in a wireless terminal, the method comprising:
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receiving a subframe that contains a positioning reference signal (“
PRS”
) based on information signaled from a serving base station, the subframe comprising Orthogonal Frequency-Division Multiplexing (“
OFDM”
) symbols over which a transmission corresponds to resource elements arranged on a subcarrier-OFDM symbol grid, wherein the subframe that contains PRS is transmitted by a first base station;determining symbols that constitute the PRSs within the received subframe based on at least one of;
a subframe type, a cyclic prefix type, and a number of transmit antennas used by the first base station; andestimating a time of arrival of the received subframe based on the PRS contained in the received subframe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A wireless terminal comprising:
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a transceiver, comprising; the transceiver configured to receive a subframe that contains a positioning reference signal (“
PRS”
) based on information signaled from a serving base station, the subframe comprising Orthogonal Frequency-Division Multiplexing (“
OFDM”
) symbols over which a transmission corresponds to resource elements arranged on a subcarrier-OFDM symbol grid, wherein the subframe that contains PRS is transmitted by a first base station; anda processor coupled to the transceiver, the processor configured to determine symbols that constitute the PRSs within the received subframe based on at least one of;
a subframe type, a cyclic prefix type, and a number of transmit antennas used by the first base station; andthe processor configured to estimate a time of arrival of the received subframe based on the PRS contained in the received subframe.
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Specification