US 9,002,368 B2Granted

Locating method

OwnerGeorg Treu, Axel Küpper +2inventors

InventorsGeorg Treu, Axel Küpper, Oliver Neukum, Claudia Linnhoff-Popien

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Abstract

The invention relates to a method for locating a first mobile terminal within a radio network. Said method comprises the following steps: a first locating process is carried out to determine an initial position of the first terminal; the first locating process is deactivated; a second locating process is carried out to at least approximately determine the current position of the first terminal relative to the initial position; and the first locating process is activated and carried out again to determine a new initial position of the first terminal when the current position reaches a minimum distance from the initial position. The invention also relates to a method for determining cliques of mobile terminals in a radio network encompassing a plurality of mobile terminals. Said method comprises the following steps: one or more independent numbers of terminals is determined, each couple of terminals of each of the independent numbers being located at a distance from each other that is greater than a predetermined threshold value; and at least one clique of terminals is determined, the couples of which are located at a shorter distance from each other than a predetermined threshold value, each independent number containing a maximum of one terminal of the clique.

Claims5

Dependent claims

A method for locating a first mobile terminal within a radio network, comprising:

a first locating process is carried out to determine an initial position of the first terminal;
the first locating process is deactivated;
a second locating process is carried out to at least approximately determine the current position of the first terminal relative to the initial position;
and
the first locating process is activated and carried out again to determine a new initial position of the first terminal when the current position reaches a minimum distance from the initial position, wherein the second locating process determines the current position by determining an indicator (eCBS), which depends on the number of joint base stations from which the first terminal receives signals in consecutive passes and/or on quality features of the radio signals, which are received from base stations by the terminal, wherein the indicator (eCBS) is determined using the following formula:
eCBS
⁡
(
M
e
(
ref
)
,
M
e
(
j
)
)
=
∑
a
=
1
L
ref
⁢
∑
b
=
1
L
j
⁢
w
a
(
ref
)
·
w
b
(
j
)
·
δ
⁡
(
ebs
a
(
ref
)
,
ebs
b
(
j
)
)
,
where
eCBS=indicator,
Me=measurements
ref=reference time
j=time at which the second locating process is carried out
L=predetermined natural number N, where N=predetermined number of base stations
w=weightings resulting from
wBS
(
j
)
=
{
(
v
1
(
j
)
,
bs
1
(
j
)
)
,
(
v
2
(
j
)
,
bs
2
(
j
)
)
,
…
⁢
,
(
v
N
(
j
)
,
bs
N
(
j
)
)
}
with
v
i
(
j
)
=
N
·
c
i
(
j
)
∑
a
=
1
N
⁢
c
a
(
j
)
where
BS=base stations
c=strength of radio signals from BS
ebs=expanded base station indicators resulting from
w
i
(
j
)
=
1
N
w
·
∑
a
=
1
N
w
⁢
∑
b
=
1
N
⁢
v
b
(
a
)
·
δ
⁡
(
bs
b
(
a
)
,
ebs
i
(
j
)
)
.

192 more elements

Dependencies are inferred from the claim text.