Method and apparatus for estimating a position of a node in a communications network
First Claim
1. A method, comprising:
- estimating, by a mobile node, a plurality of reference signal time differences between the mobile node and a network node, wherein the plurality of reference signal time difference estimates define a first correlator;
determining, with the first correlator, a second correlator of reference signal time difference estimates;
defining the second correlator with the first correlator based on a mean of the plurality of reference signal time difference estimates;
determining a distribution of the plurality of reference signal time difference estimates;
grouping clusters of reference signal time difference estimates in the distribution;
selecting a cluster from the clusters of reference signal time difference estimates, wherein the cluster comprises a reference signal time difference estimate corresponding to the earliest estimated timing in the second correlator; and
transmitting, by the mobile node, the cluster to the network node for positioning the mobile node in a communications network.
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Abstract
A method and apparatus are provided for timed estimation-based positioning of a user equipment in LTE systems. The method includes estimating, by a mobile node, a plurality of reference signal time differences (RSTD) between the mobile node and a network node. The plurality of RSTD estimates define a first correlator. The method further includes determining a second correlator of RSTD estimates, and defining the second correlator with the first correlator based on a mean of the plurality of RSTD estimates. Further, the method includes determining a distribution of the plurality of RSTD estimates, and grouping clusters of RSTD estimates in the distribution. Additionally, the method includes selecting a cluster from the clusters of RSTD estimates. The cluster includes RSTD estimates closest to a center of the second correlator. The cluster is transmitted, by the mobile node, to the network node for positioning the mobile node in a communications network.
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Citations
22 Claims
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1. A method, comprising:
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estimating, by a mobile node, a plurality of reference signal time differences between the mobile node and a network node, wherein the plurality of reference signal time difference estimates define a first correlator; determining, with the first correlator, a second correlator of reference signal time difference estimates; defining the second correlator with the first correlator based on a mean of the plurality of reference signal time difference estimates; determining a distribution of the plurality of reference signal time difference estimates; grouping clusters of reference signal time difference estimates in the distribution; selecting a cluster from the clusters of reference signal time difference estimates, wherein the cluster comprises a reference signal time difference estimate corresponding to the earliest estimated timing in the second correlator; and transmitting, by the mobile node, the cluster to the network node for positioning the mobile node in a communications network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus, comprising:
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at least one memory including computer program code; and at least one processor, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to; estimate, by a mobile node, a plurality of reference signal time differences between the mobile node and a network node, wherein the plurality of reference signal time difference estimates define a first correlator; determine, with the first correlator, a second correlator of reference signal time difference estimates; define the second correlator with the first correlator based on a mean of the plurality of reference signal time difference estimates; determine a distribution of the plurality of reference signal time difference estimates; group clusters of reference signal time difference estimates in the distribution; select a cluster from the clusters of reference signal time difference estimates, wherein the cluster comprises the reference signal time difference estimate corresponding to the earliest estimated timing in the second correlator; and transmit, by the mobile node, the cluster to the network node for positioning the mobile node in a communications network. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification