Sounding reference signal configuration method and apparatus
Embodiments of the present application disclose a sounding reference signal configuration method and an apparatus. The method includes: determining, by a base station, a movement speed of user equipment UE; determining, by the base station based on the movement speed of the UE, a UE-specific subframe configuration set in a plurality of UE-specific SRS subframe configuration sets corresponding to a used cell-specific SRS subframe configuration set, and determining a UE-specific SRS subframe configuration parameter in the determined UE-specific subframe configuration set, where the UE-specific SRS subframe configuration parameter is used to indicate a subframe used to send an SRS; and sending, by the base station, the UE-specific SRS subframe configuration parameter and identification information of the UE-specific subframe configuration set to the UE.
1. A sounding reference signal (SRS) configuration method, comprising:
determining, by a base station, a movement speed of a user equipment (UE);
determining, by the base station based on the movement speed of the UE, a UE-specific subframe configuration set of a plurality of UE-specific SRS subframe configuration sets corresponding to a used cell-specific SRS subframe configuration set, and determining a UE-specific SRS subframe configuration parameter in the determined UE-specific subframe configuration set, wherein the UE-specific SRS subframe configuration parameter indicates a subframe for sending an SRS;
sending, by the base station, the UE-specific SRS subframe configuration parameter and identification information of the UE-specific subframe configuration set to the UE;
sending, by the base station, a quantity L 1 to the UE, wherein L 1 is a maximum quantity of symbols that are in a subframe and that are used to send an SRS, and L 1 is a positive integer greater than 1; and
sending, by the base station, indication information to the UE, wherein the indication information indicates a manner for the UE to send L 2 SRSs after an aperiodic SRS is triggered, or indicates a manner for the UE to send L 2 SRSs in each period, wherein L 2 is a positive integer greater than 1 and less than or equal to L 1 , and wherein the manner comprises sending the L 2 SRSs in a plurality of subframes starting from a subframe indicated by the UE-specific SRS subframe configuration parameter;
wherein sending the L 2 SRSs further comprises: transmitting Y SRSs in an n th subframe counted from the subframe indicated by the UE-specific SRS subframe configuration parameter, until the L 2 SRSs are sent, wherein:
Y
=
min
(
L
2
-
∑
m
=
1
n
-
1
X
m
,
X
n
)
;
X
n
=
{
1
,
n
is
a
special
subframe
and
a
length
of
an
UpPTS
is
one
symbol
2
,
n
is
a
special
subframe
and
a
length
of
an
UpPTS
is
two
symbols
⌈
L
2
N
⌉
,
n
is
a
normal
subframe
;
and
N is a positive integer greater than or equal to 2 and less than or equal to L 2 .
2. The method according to claim 1 , further comprising:
determining movement speeds of all UEs in a cell; and
determining the used cell-specific SRS subframe configuration set of a plurality of cell-specific SRS subframe configuration sets based on the movement speeds of all the UEs in the cell, and determining a cell-specific SRS subframe configuration parameter in the used cell-specific SRS subframe configuration set, wherein the cell-specific SRS subframe configuration parameter indicates a subframe set for sending an SRS in the cell; and
sending identifiers of the cell-specific SRS subframe configuration parameter and the used cell-specific SRS subframe configuration set.
3. A base station, comprising:
a processor, configured to:
determine a movement speed of a user equipment (UE); and
determine, based on the movement speed of the UE, a UE-specific subframe configuration set of a plurality of UE-specific sounding reference signal (SRS) subframe configuration sets corresponding to a used cell-specific SRS subframe configuration set, and determine a UE-specific SRS subframe configuration parameter in the determined UE-specific subframe configuration set, wherein the UE-specific SRS subframe configuration parameter indicates a subframe for sending an SRS; and
a transmitter, configured to send the UE-specific SRS subframe configuration parameter and identification information of the UE-specific subframe configuration set to the UE;
wherein the processor is further configured to:
determine movement speeds of all UEs in a cell; and
determine the used cell-specific SRS subframe configuration set of a plurality of cell-specific SRS subframe configuration sets based on the movement speeds of all the UEs in the cell, and determine a cell-specific SRS subframe configuration parameter in the used cell-specific SRS subframe configuration set, wherein the cell-specific SRS subframe configuration parameter indicates a subframe set for sending an SRS in the cell; and
wherein the transmitter is further configured to send identifiers of the cell-specific SRS subframe configuration parameter and the used cell-specific SRS subframe configuration set.
4. The base station according to claim 3 , wherein the transmitter is further configured to send a quantity L 1 to the UE, wherein L 1 is a maximum quantity of symbols that are in a subframe and that are used to send an SRS, and L 1 is a positive integer greater than 1.
5. The base station according to claim 4 , wherein the transmitter is further configured to send indication information to the UE, wherein the indication information indicates a manner for the UE to send L 2 SRSs after an aperiodic SRS is triggered, or indicates a manner for the UE to send L 2 SRSs in each period, wherein L 2 is a positive integer greater than 1 and less than or equal to L 1 .
6. The base station according to claim 5 , wherein the manner comprises: sending the L 2 SRSs in one subframe indicated by the UE-specific SRS subframe configuration parameter.
7. The base station according to claim 5 , wherein the manner comprises: sending the L 2 SRSs in a plurality of subframes starting from a subframe indicated by the UE-specific SRS subframe configuration parameter.
8. The base station according to claim 7 , wherein sending the L 2 SRSs further comprises:
transmitting Y SRSs in an n th subframe counted from the subframe indicated by the UE-specific SRS subframe configuration parameter, until the L 2 SRSs are sent, wherein:
Y
=
min
(
L
2
-
∑
m
=
1
n
-
1
X
m
,
X
n
)
;
X
n
=
{
1
,
n
is
a
special
subframe
and
a
length
of
an
UpPTS
is
one
symbol
2
,
n
is
a
special
subframe
and
a
length
of
an
UpPTS
is
two
symbols
⌈
L
2
N
⌉
,
n
is
a
normal
subframe
;
and
N is a positive integer greater than or equal to 2 and less than or equal to L 2 .
9. A user equipment (UE), comprising:
a receiver, configured to receive, from a base station, identifiers of a UE-specific sounding reference signal (SRS) subframe configuration parameter and a UE-specific subframe configuration set to which the UE-specific SRS subframe configuration parameter belongs, wherein the UE-specific subframe configuration set is based on a movement speed of the UE; and
a processor, configured to determine, based on the identifiers of the UE-specific SRS subframe configuration parameter and the UE-specific subframe configuration set, a subframe for sending an SRS;
wherein the receiver is further configured to receive, from the base station, identifiers of a cell-specific SRS subframe configuration parameter and a cell-specific SRS subframe configuration set to which the cell-specific SRS subframe configuration parameter belongs, wherein the cell-specific SRS subframe configuration set is based on movement speeds of all UEs in a cell;
wherein the processor is further configured to determine, based on the identifiers of the cell-specific SRS subframe configuration parameter and the cell-specific SRS subframe configuration sets, a subframe set for sending an SRS in the cell.
10. The user equipment according to claim 9 , wherein the receiver is further configured to receive a quantity L 1 from the base station, wherein L 1 is a maximum quantity of symbols that are in a subframe and that are used to send an SRS, and L 1 is a positive integer greater than 1.
11. The user equipment according to claim 10 , wherein the receiver is further configured to receive indication information from the base station, wherein the indication information indicates a manner for the UE to send L 2 SRSs after an aperiodic SRS is triggered, or indicates a manner for the UE to send L 2 SRSs in each period, wherein L 2 is a positive integer greater than 1 and less than or equal to L 1 .
12. The user equipment according to claim 11 , wherein the manner comprises: sending the L 2 SRSs in one subframe indicated by the UE-specific SRS subframe configuration parameter.
13. The user equipment according to claim 11 , wherein the manner comprises: sending the L 2 SRSs in a plurality of subframes starting from a subframe indicated by the UE-specific SRS subframe configuration parameter.
14. The user equipment according to claim 13 , wherein sending the L 2 SRSs further comprises:
transmitting Y SRSs in an n th subframe counted from the subframe indicated by the UE-specific SRS subframe configuration parameter, until the L 2 SRSs are sent, wherein:
Y
=
min
(
L
2
-
∑
m
=
1
n
-
1
X
m
,
X
n
)
;
X
n
=
{
1
,
n
is
a
special
subframe
and
a
length
of
an
UpPTS
is
one
symbol
2
,
n
is
a
special
subframe
and
a
length
of
an
UpPTS
is
two
symbols
⌈
L
2
N
⌉
,
n
is
a
normal
subframe
;
and
N is a positive integer greater than or equal to 2 and less than or equal to L 2 .