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canghaiwuhen
OpenXG-RAN
Commits
5420e740
Commit
5420e740
authored
Apr 01, 2020
by
Robert Schmidt
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Efficient RB estimation through binary search
parent
8ffe5b49
Changes
2
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31 additions
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+31
-0
openair1/PHY/LTE_TRANSPORT/lte_mcs.c
openair1/PHY/LTE_TRANSPORT/lte_mcs.c
+29
-0
openair1/PHY/LTE_TRANSPORT/transport_common_proto.h
openair1/PHY/LTE_TRANSPORT/transport_common_proto.h
+2
-0
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openair1/PHY/LTE_TRANSPORT/lte_mcs.c
View file @
5420e740
...
...
@@ -94,6 +94,35 @@ unsigned char I_TBS2I_MCS(unsigned char I_TBS) {
return
I_MCS
;
}
uint16_t
find_nb_rb_DL
(
uint8_t
mcs
,
uint32_t
bytes
,
uint16_t
nb_rb_max
,
uint16_t
rb_gran
)
{
if
(
bytes
==
0
||
mcs
>
28
||
nb_rb_max
==
0
)
return
0
;
const
uint32_t
bits
=
bytes
<<
3
;
const
unsigned
char
I_TBS
=
get_I_TBS
(
mcs
);
uint32_t
TBS
=
TBStable
[
I_TBS
][
nb_rb_max
-
1
];
if
(
bits
>=
TBS
)
// is nb_rb_max too small?
return
nb_rb_max
;
TBS
=
TBStable
[
I_TBS
][
rb_gran
-
1
];
if
(
bits
<=
TBS
)
// is rb_gran RB enough?
return
rb_gran
;
nb_rb_max
+=
nb_rb_max
%
rb_gran
;
// round up to full RBG
uint16_t
hi
=
nb_rb_max
/
rb_gran
-
1
;
uint16_t
lo
=
0
;
uint16_t
p
=
(
hi
+
lo
)
/
2
;
for
(;
lo
+
1
!=
hi
;
p
=
(
hi
+
lo
)
/
2
)
{
const
uint16_t
rbi
=
(
p
+
1
)
*
rb_gran
-
1
;
// convert "RBG" -> RB
TBS
=
TBStable
[
I_TBS
][
rbi
];
if
(
bits
<=
TBS
)
// need less RBs
hi
=
p
;
else
// need more RBs
lo
=
p
;
}
return
(
hi
+
1
)
*
rb_gran
;
}
uint32_t
get_TBS_DL
(
uint8_t
mcs
,
uint16_t
nb_rb
)
{
uint32_t
TBS
;
...
...
openair1/PHY/LTE_TRANSPORT/transport_common_proto.h
View file @
5420e740
...
...
@@ -60,6 +60,8 @@ unsigned char get_I_TBS_UL(unsigned char I_MCS);
@return Transport block size */
uint32_t
get_TBS_DL
(
uint8_t
mcs
,
uint16_t
nb_rb
);
uint16_t
find_nb_rb_DL
(
uint8_t
mcs
,
uint32_t
bytes
,
uint16_t
nb_rb_max
,
uint16_t
rb_gran
);
/** \brief Compute Q (modulation order) based on uplink I_MCS. Implements table 7.1.7.1-1 from 36.213.
@param I_MCS
@param nb_rb
...
...
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