Method and system for determining sounding reference signal frequency hopping pattern
Disclosed are a method, system and device for determining an SRS frequency hopping pattern. The method includes: user equipment constructing a parent table which contains a plurality of child tables; determining an SRS frequency-domain reference position p according to N RB UL , C SRS , n RRC and b hop ; calculating n′ RRC according to N RB UL , C SRS and n RRC and selecting a child table from the parent table according to the n′ RRC ; according to the n SRS and the selected child table, taking n′ SRS =(n SRS mod P)·S as an index to look up the table to obtain an SRS frequency hopping frequency-domain position offset q in each SRS frequency hopping period according to an SRS frequency hopping bandwidth parameter b hop and an SRS-bandwidth parameter B SRS distributed by an eNodeB; calculating r=p+q and calculating an SRS transmission frequency-domain subcarrier offset k 0 ; repeating the processing for P times within one SRS frequency hopping period to obtain an SRS frequency hopping pattern.
1. A method for determining a sounding reference signal (SRS) frequency hopping pattern, comprising:
a user equipment (UE) constructing a parent table, wherein the constructed parent table contains a plurality of child tables, wherein, each value combination of an SRS bandwidth configuration parameter (C SRS ) and a calculated SRS frequency-domain position index n′ RRC corresponds to a child table;
the UE determining an SRS frequency-domain reference position p according to a system uplink bandwidth N RB UL , the SRS bandwidth configuration parameter C SRS , an SRS frequency-domain position index n RRC and an SRS frequency hopping bandwidth parameter b hop distributed by an eNodeB;
the UE calculating another n′ RRC according to the system uplink bandwidth N RB UL , the SRS bandwidth configuration parameter C SRS distributed by the eNodeB, and based on the SRS frequency-domain position index n RRC , selecting a child table from the constructed parent table according to the obtained n′ RRC ;
the UE obtaining an SRS frequency hopping frequency-domain position offset q by looking up the selected child table and taking n′ SRS =(n SRS mod P)·S as an index, according to an SRS transmission occasion counter n SRS and based on the selected child table, in each SRS frequency hopping period, according to the SRS frequency hopping bandwidth parameter b hop and an SRS bandwidth parameter B SRS distributed by the eNodeB;
adding the SRS frequency-domain reference position p and the SRS frequency hopping frequency-domain position offset q to obtain a current SRS transmission frequency-domain position r=p+q;
calculating an SRS transmission frequency-domain subcarrier offset k 0 according to the current SRS transmission frequency-domain position r;
repeating the above-mentioned processing steps for P times within one SRS frequency hopping period to obtain an SRS frequency hopping pattern, wherein, a value of P is determined based on b hop and B SRS together, and S is a step length related to b hop .
2. The method of claim 1 , wherein,
an SRS transmission frequency-domain reference position p is calculated according to the following equation:
p =└((4· n RRC )mod m SRS,0 /m SRS,b hop )┘· m SRS,b hop /4
In the above equation, └ ┘ denotes a rounding down function; mod denotes a modulo operation, m SRS,b hop is determined by the system uplink bandwidth N RB UL , the SRS bandwidth configuration parameter C SRS and the SRS frequency hopping bandwidth parameter b hop distributed by the eNodeB, wherein m is the number of resource blocks contained in a bandwidth of the layer designated by the associated sub-variable.
3. The method of claim 1 , wherein,
the child table in the constructed parent table comprises D=m SRS,0 /4 rows, respectively corresponding to all SRS transmission occasions within one SRS frequency hopping period when b hop =0 and B SRS =3, wherein, M SRS,0 is determined by the system uplink bandwidth N RB UL and the SRS bandwidth configuration parameter C SRS distributed by the eNodeB; wherein m is the number of resource blocks contained in a bandwidth of the layer designated by the associated sub-variable; and
in the child table, each row comprises a non-negative integer d, where a value range of d is 0≦d<D.
4. The method of claim 3 , wherein,
the value of d in the child table is determined in accordance with the following equation:
d
=
∑
b
=
0
B
SRS
m
SRS
,
b
n
b
/
4
n
b
=
{
⌊
4
n
RRC
/
m
SRS
,
b
⌋
mod
N
b
b
≤
b
hop
{
F
b
(
n
SRS
)
+
⌊
4
n
RRC
/
m
SRS
,
b
⌋
}
mod
N
b
otherwise
,
(
b
=
0
,
1
,
2
,
3
)
F
b
(
n
SRS
)
=
{
(
N
b
/
2
)
⌊
n
SRS
mod
∏
b
′
=
b
hop
b
N
b
′
∏
b
′
=
b
hop
b
-
1
N
b
′
⌋
+
⌊
n
SRS
mod
∏
b
′
=
b
hop
b
N
b
′
2
∏
b
′
=
b
hop
b
-
1
N
b
′
⌋
if
N
b
is
even
⌊
N
b
/
2
⌋
⌊
n
SRS
/
∏
b
′
=
b
hop
b
-
1
N
b
′
⌋
if
N
b
is
odd
wherein, b represents a layer, N b represents the number of branch nodes at a b th layer, Fb(nSRS) is the SRS frequency hop pattern frequency-domain offset, b′ represent a value within the range from b hop to b, Nb′ represents the number of branch nodes located in the b′ th layer and contained in the (b′−1) th layer nodes, mod denotes a modulo operation, └ ┘ denotes a rounding down operation, and Π denotes a series multiplication.
5. The method of claim 1 , wherein,
values of P and S are determined according to the following equations, wherein m is the number of resource blocks contained in a bandwidth of the layer designated by the associated sub-variable, b represents a layer, N b represents the number of branch nodes at a b th layer:
P=m SRS,b hop /m SRS,B SRS ;
S=Π b=0 b=b hop N b .
6. The method of claim 1 , wherein,
the method further comprises:
the UE storing the constructed parent table, wherein the parent table comprises all possible combinations corresponding to parameters N RB UL , C SRS and n′ RRC in turn, wherein, n′ RRC = n RRC mod (m SRS,b hop /4); wherein m is the number of resource blocks contained in a bandwidth of the layer designated by the associated sub-variable.
7. The method of claim 1 , wherein,
the subcarrier offset k 0 is calculated in accordance with the following equation:
k 0 =k′ 0 +4· N sc RB ·r
wherein, k′ 0 is an SRS frequency position offset, N sc RB is a number of subcarriers included in each resource block RB.
8. A device for determining a sounding reference signal frequency hopping pattern, comprising:
a first unit, configured to: construct a parent table, wherein the constructed parent table contains a plurality of child tables, wherein, each value combination of an SRS bandwidth configuration parameter (C SRS ) and a calculated SRS frequency-domain position index n′ RRC corresponds to a child table;
a second unit, configured to: determine an SRS frequency-domain reference position p according to a system uplink bandwidth N RB UL , the SRS bandwidth configuration parameter C SRS , an SRS frequency-domain position index n RRC and an SRS frequency hopping bandwidth parameter b hop distributed by an eNodeB;
a third unit, configured to: calculate another n′ RRC according to the system uplink bandwidth N RB UL , the SRS bandwidth configuration parameter C SRS distributed by the eNodeB, and based on the SRS frequency-domain position index n RRC , select a child table from the constructed parent table according to the obtained n′ RRC ; and look up the selected child table to obtain an SRS frequency hopping frequency-domain position offset q by taking n′ SRS =(n SRS mod P)·S as an index according to an SRS transmission occasion counter n SRS and based on the selected child table in each SRS frequency hopping period according to the SRS frequency hopping bandwidth parameter b hop and an SRS bandwidth parameter B SRS distributed by the eNodeB; add the SRS frequency-domain reference position p and the SRS frequency hopping frequency-domain position offset q to obtain a current SRS transmission frequency-domain position r=p+q; calculate an SRS transmission frequency-domain subcarrier offset k 0 according to the current SRS transmission frequency-domain position r, and repeat the above-mentioned processing steps for P times within one SRS frequency hopping period to obtain an SRS frequency hopping pattern, wherein, a value of P is determined based on b hop and B SRS together, and S is a step length related to b hop .
9. The device of claim 8 , wherein,
the second unit is configured to: calculate an SRS transmission frequency-domain reference position p according to the following equation:
p =└((4· n RRC )mod m SRS,0 /m SRS,b hop )┘· m SRS,b hop /4
in the above equation, └ ┘ denotes a rounding down function; mod denotes a modulo operation, m SRS,b hop is determined by the system uplink bandwidth N RB UL , the SRS bandwidth configuration parameter C SRS and the SRS frequency hopping bandwidth parameter b hop distributed by the eNodeB, wherein m is the number of resource blocks contained in a bandwidth of the layer designated by the associated sub-variable.
10. The device of claim 8 , wherein,
the first unit is configured to: make the child table in the constructed parent table comprise D=m SRS,0 /4 rows, respectively corresponding to all SRS transmission occasions within one SRS frequency hopping period when b hop =0 and B SRS =3, wherein, m SRS,0 is determined by the system uplink bandwidth N RB UL and the SRS bandwidth configuration parameters C SRS distributed by the eNodeB; wherein m is the number of resource blocks contained in a bandwidth of the layer designated by the associated sub-variable; and in the child table, each row comprises a non-negative integer d, where a value range of d is 0≦d<D.
11. The device of claim 10 , wherein,
the first unit is configured to: when constructing the parent table, determine the value of d in the child table in accordance with the following equation:
d
=
∑
b
=
0
B
SRS
m
SRS
,
b
n
b
/
4
n
b
=
{
⌊
4
n
RRC
/
m
SRS
,
b
⌋
mod
N
b
b
≤
b
hop
{
F
b
(
n
SRS
)
+
⌊
4
n
RRC
/
m
SRS
,
b
⌋
}
mod
N
b
otherwise
,
(
b
=
0
,
1
,
2
,
3
)
F
b
(
n
SRS
)
=
{
(
N
b
/
2
)
⌊
n
SRS
mod
∏
b
′
=
b
hop
b
N
b
′
∏
b
′
=
b
hop
b
-
1
N
b
′
⌋
+
⌊
n
SRS
mod
∏
b
′
=
b
hop
b
N
b
′
2
∏
b
′
=
b
hop
b
-
1
N
b
′
⌋
if
N
b
is
even
⌊
N
b
/
2
⌋
⌊
n
SRS
/
∏
b
′
=
b
hop
b
-
1
N
b
′
⌋
if
N
b
is
odd
wherein, b represents a layer, N b represents the number of branch nodes at a b th layer, Fb(nSRS) is the SRS frequency hop pattern frequency-domain offset, b′ represent a value within the range from b hop to b, Nb′ represents the number of branch nodes located in the b′ th layer and contained in the (b′−1) th layer nodes, mod denotes a modulo operation, └ ┘ denotes a rounding down operation, and Π denotes a series multiplication.
12. The device of claim 8 , wherein,
the third unit is configured to: determine values of P and S according to the following equations, wherein m is the number of resource blocks contained in a bandwidth of the layer designated by the associated sub-variable, b represents a layer, N b represents the number of branch nodes at a b th layer:
P=m SRS,b hop /m SRS,B SRS ;
S=Π b=0 b=b hop N b .
13. The device of claim 8 , wherein,
the first unit is further configured to: store the constructed parent table, wherein the parent table comprises all possible combinations corresponding to parameters N RB UL , C SRS and n′ RRC in turn, wherein, n′ RRC =n RRC mod (m SRS,b hop /4); wherein m is the number of resource blocks contained in a bandwidth of the layer designated by the associated sub-variable.
14. The device of claim 8 , wherein,
the third unit is configured to: calculate the subcarrier offset k 0 in accordance with the following equation:
k 0 =k′ 0 +4· N sc RB ·r
wherein, k′ 0 is an SRS frequency position offset, N sc RB is a number of subcarriers included in each resource block RB.
15. A method for determining a sounding reference signal (SRS) frequency hopping pattern, comprising the following steps:
a user equipment (UE) constructing a parent table, wherein the constructed parent table contains a plurality of child tables;
the UE determining an SRS frequency-domain reference position p according to a system uplink bandwidth N RB UL , and an SRS bandwidth configuration parameter C SRS and an SRS frequency-domain position index n RRC distributed by an eNodeB;
the UE selecting a child table from the constructed parent table according to the system uplink bandwidth N RB UL , and the SRS bandwidth configuration parameter C SRS distributed by the eNodeB;
the UE looking up the elected child table to obtain an SRS frequency hopping frequency-domain position offset q by taking n′ SRS =(n SRS mod P)·S as an index, according to an SRS transmission occasion counter n SRS and based on the selected child table, in each SRS frequency hopping period, according to the SRS frequency hopping bandwidth parameter b hop and an SRS bandwidth parameter B SRS distributed by the eNodeB;
adding the SRS frequency-domain reference position p and the SRS frequency hopping frequency-domain position offset q to obtain a current SRS transmission frequency-domain position r=p+q;
calculating an SRS transmission frequency-domain subcarrier offset k 0 according to the current SRS transmission frequency-domain position r,
repeating the above-mentioned processing steps for P times within one SRS frequency hopping period to obtain an SRS frequency hopping pattern, wherein, a value of P is determined based on b hop and B SRS together, and S is a step length related to b hop .
16. The method of claim 15 , wherein,
an SRS transmission frequency-domain reference position p is calculated according to the following equation:
p =└((4· n RRC )mod m SRS,0 /m SRS,b hop )┘· m SRS,b hop /4
in the above equation, └ ┘ denotes a rounding down function; mod denotes a modulo operation, m SRS,b hop is determined by the system uplink bandwidth N RB UL , the SRS bandwidth configuration parameter C SRS and the SRS bandwidth parameter B SRS distributed by the eNodeB, wherein m is the number of resource blocks contained in a bandwidth of the layer designated by the associated sub-variable.
17. The method of claim 15 , wherein,
the child table comprises D=m SRS,0 /4 rows, respectively corresponding to all SRS transmission occasions within one SRS frequency hopping period when b hop =0 and B SRS =3, wherein, m SRS,0 is determined by the system uplink bandwidth N RB UL and the SRS bandwidth configuration parameter C SRS distributed by the eNodeB; wherein m is the number of resource blocks contained in a bandwidth of the layer designated by the associated sub-variable, b represents a layer, N b represents the number of branch nodes at a b th layer, Fb(nSRS) is the SRS frequency hop pattern frequency-domain offset, b′ represent a value within the range from b hop to b, Nb′ represents the number of branch nodes located in the b′ th layer and contained in the (b′−1) th layer nodes, mod denotes a modulo operation, └ ┘ denotes a rounding down operation, and Π denotes a series multiplication; in the child table, each row comprises a non-negative integer d, where d is calculated according to the following equation:
d
(
n
SRS
)
=
∑
b
=
0
B
SRS
m
SRS
,
b
F
b
(
n
SRS
)
/
4
wherein,
F
b
(
n
SRS
)
=
{
(
N
b
/
2
)
⌊
n
SRS
mod
∏
b
′
=
b
hop
b
N
b
′
∏
b
′
=
b
hop
b
-
1
N
b
′
⌋
+
⌊
n
SRS
mod
∏
b
′
=
b
hop
b
N
b
′
2
∏
b
′
=
b
hop
b
-
1
N
b
′
⌋
if
N
b
is
even
⌊
N
b
/
2
⌋
⌊
n
SRS
/
∏
b
′
=
b
hop
b
-
1
N
b
′
⌋
if
N
b
is
odd
.
18. The method of claim 15 , wherein,
values of P and S are determined according to the following equation:
P=m SRS,b hop /m SRS,B SRS ;
S=Π b=0 b=b hop N b ,
or,
wherein,
the SRS transmission subcarrier offset k 0 is calculated according to the SRS transmission frequency-domain position r, and can be calculated in accordance with the following equation: k 0 =k′ 0 +4·N sc RB ·r, where k′ 0 is an SRS frequency position offset, and N sc RB is a number of subcarriers included in each resource block RB; wherein m is the number of resource blocks contained in a bandwidth of the layer designated by the associated sub-variable, b represents a layer, N b represents the number of branch nodes at a b th layer, Fb(nSRS) is the SRS frequency hop pattern frequency-domain offset, mod denotes a modulo operation, and Π denotes a series multiplication.
19. A device for determining a sounding reference signal (SRS) frequency hopping pattern, comprising:
a first unit, configured to: construct a parent table, wherein the constructed parent table contains a plurality of child tables;
a second unit, configured to: determine an SRS frequency-domain reference position p according to a system uplink bandwidth N RB UL , and an SRS bandwidth configuration parameter C SRS and an SRS frequency-domain position index n RRC distributed by an eNodeB;
a third unit, configured to: select a child table from the parent table according to the system uplink bandwidth N RB UL and the SRS bandwidth configuration parameter C SRS distributed by the eNodeB, and look up the selected child table to obtain an SRS frequency hopping frequency-domain position offset q by taking n′ SRS =(n SRS mod P)·S as an index according to an SRS transmission occasion counter n SRS and based on the selected child table in each SRS frequency hopping period according to the SRS frequency hopping bandwidth parameter b hop and an SRS bandwidth parameter B SRS distributed by the eNodeB; add the SRS frequency-domain reference position p and the SRS frequency hopping frequency-domain position offset q to obtain a current SRS transmission frequency-domain position r=p+q, calculate an SRS transmission frequency-domain subcarrier offset k 0 according to the current SRS transmission frequency-domain position r, and repeat the above-mentioned processing steps for P times within one SRS frequency hopping period to obtain an SRS frequency hopping pattern, wherein, a value of P is determined based on b hop and B SRS together, and S is a step length related to b hop .
20. The device of claim 19 , wherein,
the second unit is configured to: calculate an SRS transmission frequency-domain reference position p according to the following equation:
p =└((4· n RRC )mod m SRS,0 /m SRS,b hop )┘· m SRS,b hop /4
in the above equation, └ ┘ denotes a rounding down function; mod denotes a modulo operation, m SRS,b hop is determined by the system uplink bandwidth N RB UL , the SRS bandwidth configuration parameter C SRS and the SRS frequency hopping bandwidth parameter B SRS distributed by the eNodeB,
or,
wherein,
the first unit is configured to, make the child table in the constructed parent table comprise D=m SRS,0 /4 rows respectively corresponding to all SRS transmission occasions within one SRS frequency hopping period when b hop =0 and B SRS =3, wherein, m SRS,0 is determined b the s stem uplink bandwidth N RB UL and the SRS bandwidth configuration parameter C SRS distributed b the eNodeB; in the child table, each row comprises a non-negative integer d, wherein, d is calculated in accordance with the following equation:
d
(
n
SRS
)
=
∑
b
=
0
B
SRS
m
SRS
,
b
F
b
(
n
SRS
)
/
4
wherein
F
b
(
n
SRS
)
=
{
(
N
b
/
2
)
⌊
n
SRS
mod
∏
b
′
=
b
hop
b
N
b
′
∏
b
′
=
b
hop
b
-
1
N
b
′
⌋
+
⌊
n
SRS
mod
∏
b
′
=
b
hop
b
N
b
′
2
∏
b
′
=
b
hop
b
-
1
N
b
′
⌋
if
N
b
is
even
⌊
N
b
/
2
⌋
⌊
n
SRS
/
∏
b
′
=
b
hop
b
-
1
N
b
′
⌋
if
N
b
is
odd
,
or,
wherein,
the second unit is configured to determine values of P and S according to the following equation:
P=m SRS,b hop /m SRS,B SRS
S=Π b=0 b=b hop N b ,
or,
wherein,
the third unit is configured to: calculate the SRS transmission subcarrier offset k 0 in accordance with the SRS transmission frequency-domain position r, and calculate according to the following equation: k 0 =k′ 0 +4·N sc RB ·r, wherein, k′ 0 is an SRS frequency position offset, and N sc RB is a number of subcarriers included in each resource block RB; wherein m is the number of resource blocks contained in a bandwidth of the layer designated by the associated sub-variable, b represents a layer, N b represents the number of branch nodes at a b th layer, Fb(nSRS) is the SRS frequency hop pattern frequency-domain offset, b′ represent a value within the range from b hop to b, Nb′ represents the number of branch nodes located in the b′ th layer and contained in the (b′−1) th layer nodes, and Π denotes a series multiplication.