Positioning method, terminal device, and network device
This present disclosure provides a positioning method, a terminal device, and a network device. One example method includes: acquiring, by a terminal device, first information in an initial access process, where the first information is used to position the terminal device, and the first information is associated with direction information of the terminal device relative to a base station.
1 . A positioning method, comprising:
acquiring, by a terminal device, first information in an initial access process, wherein the first information comprises direction information of the terminal device relative to a base station, the base station comprises a base station of a serving cell or a base station of a neighboring cell, wherein the acquiring the first information comprises:
receiving, by the terminal device, a first synchronization signal/physical broadcast channel (SSB) sent by the base station of the serving cell; and
determining, by the terminal device based on an index of the first SSB, the direction information of the terminal device relative to the base station of the serving cell.
2 . The method according to claim 1 , further comprising:
sending, by the terminal device, first indication information to the base station, wherein the first indication information instructs the base station to perform angle of arrival (AOA) measurement, and the first indication information is carried in a message of a random-access process.
3 . The method according to claim 2 , wherein the first indication information is associated with a preamble in the random-access process.
4 . The method according to claim 3 , wherein the first indication information is associated with one or more of the following pieces of information: an index of a preamble, scrambling information of a preamble sequence, or a preamble sequence.
5 . The method according to claim 2 , further comprising:
receiving, by the terminal device, AOA information sent by the base station, wherein the AOA information is carried in a message of the random-access process.
6 . The method according to claim 5 , wherein the AOA information is carried in a random-access response message.
7 . The method according to claim 1 , wherein
the direction information is further determined based on a first correspondence, wherein the first correspondence comprises a correspondence between an SSB index of the serving cell and an SSB beam direction; and the method further comprises:
determining, by the terminal device, location information of the terminal device based on the direction information and location information of the base station of the neighboring cell.
8 . The method according to claim 7 , further comprising:
receiving, by the terminal device, a second SSB sent by the base station of the neighboring cell;
determining, by the terminal device based on an index of the second SSB and a second correspondence, a second angle of the terminal device relative to the base station of the neighboring cell, wherein the second correspondence includes a correspondence between an SSB index of the neighboring cell and the SSB beam direction;
wherein the location information of the terminal device is determined further based on the second angle, and location information of the base station of the neighboring cell.
9 . The method according to claim 8 ,
wherein the neighboring cell comprises a first neighboring cell and a second neighboring cell, and location coordinates (x, y) of the terminal device are:
{
x
=
α
y
b
1
-
y
b
2
+
ctg
(
θ
2
)
x
b
2
-
ctg
(
θ
1
)
x
b
1
ctg
(
θ
2
)
-
ctg
(
θ
1
)
+
(
1
-
α
)
y
b
1
-
y
b
3
+
ctg
(
θ
3
)
x
b
3
-
ctg
(
θ
1
)
x
b
1
ctg
(
θ
3
)
-
c
tg
(
θ
1
)
y
=
α
x
b
1
-
x
b
2
+
tg
(
θ
2
)
y
b
2
-
tg
(
θ
1
)
y
b
1
tg
(
θ
2
)
-
tg
(
θ
1
)
+
(
1
-
α
)
x
b
1
-
x
b
3
+
tg
(
θ
3
)
y
b
3
-
tg
(
θ
1
)
y
b
1
tg
(
θ
3
)
-
tg
(
θ
1
)
wherein an x-axis is perpendicular to a y-axis, (x b1 , y b1 ) is location coordinates of the base station of the serving cell, (x b2 , y b2 ) is location coordinates of a base station of the first neighboring cell, (x b3 , y b3 ) is location coordinates of a base station of the second neighboring cell, θ 1 is a first angle of the terminal device relative to the base station of the serving cell, θ 2 is an angle of the terminal device relative to the first neighboring cell, θ 3 is an angle of the terminal device relative to the second neighboring cell, a represents a weight coefficient, and 0≤α≤1.
10 . The method according to claim 9 , wherein α is determined from the following formula:
α
=
R
S
R
P
1
R
S
R
P
1
+
R
S
R
P
2
wherein RSRP 1 represents a RSRP value of measurement performed by the terminal device on the base station of the first neighboring cell, and RSRP 2 represents a RSRP value of measurement performed by the terminal device on the base station of the second neighboring cell.
11 . The method according to claim 7 , wherein the correspondence between the SSB index and the SSB beam direction is carried in a broadcast message.
12 . An apparatus, comprising:
at least one processor;
one or more non-transitory computer-readable storage media coupled to the at least one processor and storing programming instructions for execution by the at least one processor, wherein the programming instructions, when executed, cause the apparatus to perform operations comprising:
acquiring first information in an initial access process, wherein the first information comprises direction information of a terminal device relative to a base station, the base station comprises a base station of a serving cell or a base station of a neighboring cell, wherein the acquiring the first information comprises:
receiving, by the terminal device, a first a first synchronization signal/physical broadcast channel (SSB) sent by the base station of the serving cell; and
determining, by the terminal device based on an index of the first SSB, the direction information of the terminal device relative to the base station of the serving cell.
13 . The apparatus according to claim 12 , the operations further comprising:
sending first indication information to the base station, wherein the first indication information instructs the base station to perform AOA measurement, and the first indication information is carried in a message of a random-access process.
14 . The apparatus according to claim 13 , wherein the first indication information is associated with a preamble in the random-access process.
15 . The apparatus according to claim 14 , wherein the first indication information is associated with one or more of the following pieces of information: an index of a preamble, scrambling information of a preamble sequence, or a preamble sequence.
16 . The apparatus according to claim 13 , the operations further comprising:
receiving AOA information sent by the base station, wherein the AOA information is carried in a message of the random-access process.
17 . The apparatus according to claim 16 , wherein the AOA information is carried in a random-access response message.
18 . The apparatus according to claim 12 , wherein
the direction information is further determined based on a first correspondence, wherein the first correspondence comprises a correspondence between an SSB index of the serving cell and an SSB beam direction; and the operations further comprise:
determining location information of a terminal device based on the direction information and location information of the base station of the neighboring cell.
19 . The apparatus according to claim 18 , the operations further comprising:
receiving a second SSB sent by the base station of the neighboring cell;
determining, based on an index of the second SSB and a second correspondence, a second angle of the terminal device relative to the base station of the neighboring cell, wherein the second correspondence includes a correspondence between an SSB index of the neighboring cell and the SSB beam direction;
wherein the location information of the terminal device is determined further based on the second angle, and location information of the base station of the neighboring cell.
20 . A positioning method, comprising:
sending, by a base station of a serving cell, a first synchronization signal/physical broadcast channel (SSB), wherein an index of the first SSB is used to determine direction information of a terminal device relative to the base station.